File Coverage

blib/lib/Perl/Tidy/Formatter.pm

Criterion	Covered	Total	%
statement	8704	10269	84.7
branch	4106	5584	73.5
condition	3205	4716	67.9
subroutine	351	386	90.9
pod	0	285	0.0
total	16366	21240	77.0

####################################################################
#
# The Perl::Tidy::Formatter package adds indentation, whitespace, and
# line breaks to the token stream
#
#####################################################################

# Index...
# CODE SECTION 1: Preliminary code, global definitions and sub new
#                 sub new
# CODE SECTION 2: Some Basic Utilities
# CODE SECTION 3: Check and process options
#                 sub check_options
# CODE SECTION 4: Receive lines from the tokenizer
#                 sub write_line
# CODE SECTION 5: Pre-process the entire file
#                 sub finish_formatting
# CODE SECTION 6: Process line-by-line
#                 sub process_all_lines
# CODE SECTION 7: Process lines of code
#                 process_line_of_CODE
# CODE SECTION 8: Utilities for setting breakpoints
#                 sub set_forced_breakpoint
# CODE SECTION 9: Process batches of code
#                 sub grind_batch_of_CODE
# CODE SECTION 10: Code to break long statements
#                  sub break_long_lines
# CODE SECTION 11: Code to break long lists
#                  sub break_lists
# CODE SECTION 12: Code for setting indentation
# CODE SECTION 13: Preparing batch of lines for vertical alignment
#                  sub convey_batch_to_vertical_aligner
# CODE SECTION 14: Code for creating closing side comments
#                  sub add_closing_side_comment
# CODE SECTION 15: Summarize
#                  sub wrapup

#######################################################################
# CODE SECTION 1: Preliminary code and global definitions up to sub new
#######################################################################

package Perl::Tidy::Formatter;
use strict;
use warnings;

# DEVEL_MODE gets switched on during automated testing for extra checking
use constant DEVEL_MODE   => 0;
use constant EMPTY_STRING => q{};
use constant SPACE        => q{ };

{ #<<< A non-indenting brace to contain all lexical variables

use Carp;
use English    qw( -no_match_vars );
use List::Util qw( min max first );    # min, max first are in Perl 5.8
our $VERSION = '20230912';

# The Tokenizer will be loaded with the Formatter
##use Perl::Tidy::Tokenizer;    # for is_keyword()

sub AUTOLOAD {

    # Catch any undefined sub calls so that we are sure to get
    # some diagnostic information.  This sub should never be called
    # except for a programming error.
    our $AUTOLOAD;
    return if ( $AUTOLOAD =~ /\bDESTROY$/ );
    my ( $pkg, $fname, $lno ) = caller();
    my $my_package = __PACKAGE__;
    print {*STDERR} <<EOM;
======================================================================
Error detected in package '$my_package', version $VERSION
Received unexpected AUTOLOAD call for sub '$AUTOLOAD'
Called from package: '$pkg'
Called from File '$fname'  at line '$lno'
This error is probably due to a recent programming change
======================================================================
EOM
    exit 1;
} ## end sub AUTOLOAD

sub DESTROY {
    my $self = shift;
    $self->_decrement_count();
    return;
}

sub Die {
    my ($msg) = @_;
    Perl::Tidy::Die($msg);
    croak "unexpected return from Perl::Tidy::Die";
}

sub Warn {
    my ($msg) = @_;
    Perl::Tidy::Warn($msg);
    return;
}

sub Fault {
    my ($msg) = @_;

    # This routine is called for errors that really should not occur
    # except if there has been a bug introduced by a recent program change.
    # Please add comments at calls to Fault to explain why the call
    # should not occur, and where to look to fix it.
    my ( $package0, $filename0, $line0, $subroutine0 ) = caller(0);
    my ( $package1, $filename1, $line1, $subroutine1 ) = caller(1);
    my ( $package2, $filename2, $line2, $subroutine2 ) = caller(2);
    my $pkg = __PACKAGE__;

    my $input_stream_name = get_input_stream_name();

    Die(<<EOM);
==============================================================================
While operating on input stream with name: '$input_stream_name'
A fault was detected at line $line0 of sub '$subroutine1'
in file '$filename1'
which was called from line $line1 of sub '$subroutine2'
Message: '$msg'
This is probably an error introduced by a recent programming change.
$pkg reports VERSION='$VERSION'.
==============================================================================
EOM

    # We shouldn't get here, but this return is to keep Perl-Critic from
    # complaining.
    return;
} ## end sub Fault

sub Fault_Warn {
    my ($msg) = @_;

    # This is the same as Fault except that it calls Warn instead of Die
    # and returns.
    my ( $package0, $filename0, $line0, $subroutine0 ) = caller(0);
    my ( $package1, $filename1, $line1, $subroutine1 ) = caller(1);
    my ( $package2, $filename2, $line2, $subroutine2 ) = caller(2);
    my $input_stream_name = get_input_stream_name();

    Warn(<<EOM);
==============================================================================
While operating on input stream with name: '$input_stream_name'
A fault was detected at line $line0 of sub '$subroutine1'
in file '$filename1'
which was called from line $line1 of sub '$subroutine2'
Message: '$msg'
This is probably an error introduced by a recent programming change.
Perl::Tidy::Formatter.pm reports VERSION='$VERSION'.
==============================================================================
EOM

    return;
} ## end sub Fault_Warn

sub Exit {
    my ($msg) = @_;
    Perl::Tidy::Exit($msg);
    croak "unexpected return from Perl::Tidy::Exit";
}

# Global variables ...
my (

    #-----------------------------------------------------------------
    # Section 1: Global variables which are either always constant or
    # are constant after being configured by user-supplied
    # parameters.  They remain constant as a file is being processed.
    # The INITIALIZER comment tells the sub responsible for initializing
    # each variable. Failure to initialize or re-initialize a global
    # variable can cause bugs which are hard to locate.
    #-----------------------------------------------------------------

    # INITIALIZER: sub check_options
    $rOpts,

    # short-cut option variables
    # INITIALIZER: sub initialize_global_option_vars
    $rOpts_add_newlines,
    $rOpts_add_whitespace,
    $rOpts_add_trailing_commas,
    $rOpts_blank_lines_after_opening_block,
    $rOpts_block_brace_tightness,
    $rOpts_block_brace_vertical_tightness,
    $rOpts_brace_follower_vertical_tightness,
    $rOpts_break_after_labels,
    $rOpts_break_at_old_attribute_breakpoints,
    $rOpts_break_at_old_comma_breakpoints,
    $rOpts_break_at_old_keyword_breakpoints,
    $rOpts_break_at_old_logical_breakpoints,
    $rOpts_break_at_old_semicolon_breakpoints,
    $rOpts_break_at_old_ternary_breakpoints,
    $rOpts_break_open_compact_parens,
    $rOpts_closing_side_comments,
    $rOpts_closing_side_comment_else_flag,
    $rOpts_closing_side_comment_maximum_text,
    $rOpts_comma_arrow_breakpoints,
    $rOpts_continuation_indentation,
    $rOpts_cuddled_paren_brace,
    $rOpts_delete_closing_side_comments,
    $rOpts_delete_old_whitespace,
    $rOpts_delete_side_comments,
    $rOpts_delete_trailing_commas,
    $rOpts_delete_weld_interfering_commas,
    $rOpts_extended_continuation_indentation,
    $rOpts_format_skipping,
    $rOpts_freeze_whitespace,
    $rOpts_function_paren_vertical_alignment,
    $rOpts_fuzzy_line_length,
    $rOpts_ignore_old_breakpoints,
    $rOpts_ignore_side_comment_lengths,
    $rOpts_ignore_perlcritic_comments,
    $rOpts_indent_closing_brace,
    $rOpts_indent_columns,
    $rOpts_indent_only,
    $rOpts_keep_interior_semicolons,
    $rOpts_line_up_parentheses,
    $rOpts_logical_padding,
    $rOpts_maximum_consecutive_blank_lines,
    $rOpts_maximum_fields_per_table,
    $rOpts_maximum_line_length,
    $rOpts_one_line_block_semicolons,
    $rOpts_opening_brace_always_on_right,
    $rOpts_outdent_keywords,
    $rOpts_outdent_labels,
    $rOpts_outdent_long_comments,
    $rOpts_outdent_long_quotes,
    $rOpts_outdent_static_block_comments,
    $rOpts_recombine,
    $rOpts_short_concatenation_item_length,
    $rOpts_space_prototype_paren,
    $rOpts_stack_closing_block_brace,
    $rOpts_static_block_comments,
    $rOpts_add_missing_else,
    $rOpts_warn_missing_else,
    $rOpts_tee_block_comments,
    $rOpts_tee_pod,
    $rOpts_tee_side_comments,
    $rOpts_variable_maximum_line_length,
    $rOpts_valign_code,
    $rOpts_valign_side_comments,
    $rOpts_valign_if_unless,
    $rOpts_whitespace_cycle,
    $rOpts_extended_block_tightness,
    $rOpts_extended_line_up_parentheses,

    # Static hashes
    # INITIALIZER: BEGIN block
    %is_assignment,
    %is_non_list_type,
    %is_if_unless_and_or_last_next_redo_return,
    %is_if_elsif_else_unless_while_until_for_foreach,
    %is_if_unless_while_until_for_foreach,
    %is_last_next_redo_return,
    %is_if_unless,
    %is_if_elsif,
    %is_if_unless_elsif,
    %is_if_unless_elsif_else,
    %is_elsif_else,
    %is_and_or,
    %is_chain_operator,
    %is_block_without_semicolon,
    %ok_to_add_semicolon_for_block_type,
    %is_opening_type,
    %is_closing_type,
    %is_opening_token,
    %is_closing_token,
    %is_ternary,
    %is_equal_or_fat_comma,
    %is_counted_type,
    %is_opening_sequence_token,
    %is_closing_sequence_token,
    %matching_token,
    %is_container_label_type,
    %is_die_confess_croak_warn,
    %is_my_our_local,
    %is_soft_keep_break_type,
    %is_indirect_object_taker,
    @all_operators,
    %is_do_follower,
    %is_anon_sub_brace_follower,
    %is_anon_sub_1_brace_follower,
    %is_other_brace_follower,

    # INITIALIZER: sub check_options
    $controlled_comma_style,
    %keep_break_before_type,
    %keep_break_after_type,
    %outdent_keyword,
    %keyword_paren_inner_tightness,
    %container_indentation_options,
    %tightness,
    %line_up_parentheses_control_hash,
    $line_up_parentheses_control_is_lxpl,

    # These can be modified by grep-alias-list
    # INITIALIZER: sub initialize_grep_and_friends
    %is_sort_map_grep,
    %is_sort_map_grep_eval,
    %is_sort_map_grep_eval_do,
    %is_block_with_ci,
    %is_keyword_returning_list,
    %block_type_map,         # initialized in BEGIN, but may be changed
    %want_one_line_block,    # may be changed in prepare_cuddled_block_types

    # INITIALIZER: sub prepare_cuddled_block_types
    $rcuddled_block_types,

    # INITIALIZER: sub initialize_whitespace_hashes
    %binary_ws_rules,
    %want_left_space,
    %want_right_space,

    # INITIALIZER: sub initialize_bond_strength_hashes
    %right_bond_strength,
    %left_bond_strength,

    # INITIALIZER: sub initialize_token_break_preferences
    %want_break_before,
    %break_before_container_types,

    # INITIALIZER: sub initialize_space_after_keyword
    %space_after_keyword,

    # INITIALIZER: sub initialize_extended_block_tightness_list
    %extended_block_tightness_list,

    # INITIALIZED BY initialize_global_option_vars
    %opening_vertical_tightness,
    %closing_vertical_tightness,
    %closing_token_indentation,
    $some_closing_token_indentation,
    %opening_token_right,
    %stack_opening_token,
    %stack_closing_token,

    # INITIALIZER: sub initialize_weld_nested_exclusion_rules
    %weld_nested_exclusion_rules,

    # INITIALIZER: sub initialize_weld_fat_comma_rules
    %weld_fat_comma_rules,

    # INITIALIZER: sub initialize_trailing_comma_rules
    %trailing_comma_rules,

    # regex patterns for text identification.
    # Most can be configured by user parameters.
    # Most are initialized in a sub make_**_pattern during configuration.

    # INITIALIZER: sub make_sub_matching_pattern
    $SUB_PATTERN,
    $ASUB_PATTERN,
    %matches_ASUB,

    # INITIALIZER: make_static_block_comment_pattern
    $static_block_comment_pattern,

    # INITIALIZER: sub make_static_side_comment_pattern
    $static_side_comment_pattern,

    # INITIALIZER: make_format_skipping_pattern
    $format_skipping_pattern_begin,
    $format_skipping_pattern_end,

    # INITIALIZER: sub make_non_indenting_brace_pattern
    $non_indenting_brace_pattern,

    # INITIALIZER: sub make_bl_pattern
    $bl_exclusion_pattern,

    # INITIALIZER: make_bl_pattern
    $bl_pattern,

    # INITIALIZER: sub make_bli_pattern
    $bli_exclusion_pattern,

    # INITIALIZER: sub make_bli_pattern
    $bli_pattern,

    # INITIALIZER: sub make_block_brace_vertical_tightness_pattern
    $block_brace_vertical_tightness_pattern,

    # INITIALIZER: sub make_blank_line_pattern
    $blank_lines_after_opening_block_pattern,
    $blank_lines_before_closing_block_pattern,

    # INITIALIZER: sub make_keyword_group_list_pattern
    $keyword_group_list_pattern,
    $keyword_group_list_comment_pattern,

    # INITIALIZER: sub make_closing_side_comment_prefix
    $closing_side_comment_prefix_pattern,

    # INITIALIZER: sub make_closing_side_comment_list_pattern
    $closing_side_comment_list_pattern,

    # Table to efficiently find indentation and max line length
    # from level.
    # INITIALIZER: sub initialize_line_length_vars
    @maximum_line_length_at_level,
    @maximum_text_length_at_level,
    $stress_level_alpha,
    $stress_level_beta,
    $high_stress_level,

    # Total number of sequence items in a weld, for quick checks
    # INITIALIZER: weld_containers
    $total_weld_count,

    #--------------------------------------------------------
    # Section 2: Work arrays for the current batch of tokens.
    #--------------------------------------------------------

    # These are re-initialized for each batch of code
    # INITIALIZER: sub initialize_batch_variables
    $max_index_to_go,
    @block_type_to_go,
    @type_sequence_to_go,
    @forced_breakpoint_to_go,
    @token_lengths_to_go,
    @summed_lengths_to_go,
    @levels_to_go,
    @leading_spaces_to_go,
    @reduced_spaces_to_go,
    @mate_index_to_go,
    @ci_levels_to_go,
    @nesting_depth_to_go,
    @nobreak_to_go,
    @old_breakpoint_to_go,
    @tokens_to_go,
    @K_to_go,
    @types_to_go,
    @inext_to_go,
    @parent_seqno_to_go,

    # forced breakpoint variables associated with each batch of code
    $forced_breakpoint_count,
    $forced_breakpoint_undo_count,
    $index_max_forced_break,
);

BEGIN {

    # Index names for token variables.
    # Do not combine with other BEGIN blocks (c101).
    my $i = 0;
    use constant {
        _CI_LEVEL_          => $i++,
        _CUMULATIVE_LENGTH_ => $i++,
        _LINE_INDEX_        => $i++,
        _KNEXT_SEQ_ITEM_    => $i++,
        _LEVEL_             => $i++,
        _TOKEN_             => $i++,
        _TOKEN_LENGTH_      => $i++,
        _TYPE_              => $i++,
        _TYPE_SEQUENCE_     => $i++,

        # Number of token variables; must be last in list:
        _NVARS => $i++,
    };
} ## end BEGIN

BEGIN {

    # Index names for $self variables.
    # Do not combine with other BEGIN blocks (c101).
    my $i = 0;
    use constant {
        _rlines_                    => $i++,
        _rLL_                       => $i++,
        _Klimit_                    => $i++,
        _rdepth_of_opening_seqno_   => $i++,
        _rSS_                       => $i++,
        _Iss_opening_               => $i++,
        _Iss_closing_               => $i++,
        _rblock_type_of_seqno_      => $i++,
        _ris_asub_block_            => $i++,
        _ris_sub_block_             => $i++,
        _K_opening_container_       => $i++,
        _K_closing_container_       => $i++,
        _K_opening_ternary_         => $i++,
        _K_closing_ternary_         => $i++,
        _K_first_seq_item_          => $i++,
        _rtype_count_by_seqno_      => $i++,
        _ris_function_call_paren_   => $i++,
        _rlec_count_by_seqno_       => $i++,
        _ris_broken_container_      => $i++,
        _ris_permanently_broken_    => $i++,
        _rblank_and_comment_count_  => $i++,
        _rhas_list_                 => $i++,
        _rhas_broken_list_          => $i++,
        _rhas_broken_list_with_lec_ => $i++,
        _rfirst_comma_line_index_   => $i++,
        _rhas_code_block_           => $i++,
        _rhas_broken_code_block_    => $i++,
        _rhas_ternary_              => $i++,
        _ris_excluded_lp_container_ => $i++,
        _rlp_object_by_seqno_       => $i++,
        _rwant_reduced_ci_          => $i++,
        _rno_xci_by_seqno_          => $i++,
        _rbrace_left_               => $i++,
        _ris_bli_container_         => $i++,
        _rparent_of_seqno_          => $i++,
        _rchildren_of_seqno_        => $i++,
        _ris_list_by_seqno_         => $i++,
        _ris_cuddled_closing_brace_ => $i++,
        _rbreak_container_          => $i++,
        _rshort_nested_             => $i++,
        _length_function_           => $i++,
        _is_encoded_data_           => $i++,
        _fh_tee_                    => $i++,
        _sink_object_               => $i++,
        _file_writer_object_        => $i++,
        _vertical_aligner_object_   => $i++,
        _logger_object_             => $i++,
        _radjusted_levels_          => $i++,
        _this_batch_                => $i++,

        _ris_special_identifier_token_    => $i++,
        _last_output_short_opening_token_ => $i++,

        _last_line_leading_type_  => $i++,
        _last_line_leading_level_ => $i++,

        _added_semicolon_count_    => $i++,
        _first_added_semicolon_at_ => $i++,
        _last_added_semicolon_at_  => $i++,

        _deleted_semicolon_count_    => $i++,
        _first_deleted_semicolon_at_ => $i++,
        _last_deleted_semicolon_at_  => $i++,

        _embedded_tab_count_    => $i++,
        _first_embedded_tab_at_ => $i++,
        _last_embedded_tab_at_  => $i++,

        _first_tabbing_disagreement_       => $i++,
        _last_tabbing_disagreement_        => $i++,
        _tabbing_disagreement_count_       => $i++,
        _in_tabbing_disagreement_          => $i++,
        _first_brace_tabbing_disagreement_ => $i++,
        _in_brace_tabbing_disagreement_    => $i++,

        _saw_VERSION_in_this_file_ => $i++,
        _saw_END_or_DATA_          => $i++,

        _rK_weld_left_         => $i++,
        _rK_weld_right_        => $i++,
        _rweld_len_right_at_K_ => $i++,

        _rspecial_side_comment_type_ => $i++,

        _rseqno_controlling_my_ci_    => $i++,
        _ris_seqno_controlling_ci_    => $i++,
        _save_logfile_                => $i++,
        _maximum_level_               => $i++,
        _maximum_level_at_line_       => $i++,
        _maximum_BLOCK_level_         => $i++,
        _maximum_BLOCK_level_at_line_ => $i++,

        _rKrange_code_without_comments_ => $i++,
        _rbreak_before_Kfirst_          => $i++,
        _rbreak_after_Klast_            => $i++,
        _converged_                     => $i++,

        _rstarting_multiline_qw_seqno_by_K_ => $i++,
        _rending_multiline_qw_seqno_by_K_   => $i++,
        _rKrange_multiline_qw_by_seqno_     => $i++,
        _rmultiline_qw_has_extra_level_     => $i++,

        _rcollapsed_length_by_seqno_       => $i++,
        _rbreak_before_container_by_seqno_ => $i++,
        _roverride_cab3_                   => $i++,
        _ris_assigned_structure_           => $i++,
        _ris_short_broken_eval_block_      => $i++,
        _ris_bare_trailing_comma_by_seqno_ => $i++,

        _rseqno_non_indenting_brace_by_ix_ => $i++,
        _rmax_vertical_tightness_          => $i++,

        _no_vertical_tightness_flags_ => $i++,

        _LAST_SELF_INDEX_ => $i - 1,
    };
} ## end BEGIN

BEGIN {

    # Index names for batch variables.
    # Do not combine with other BEGIN blocks (c101).
    # These are stored in _this_batch_, which is a sub-array of $self.
    my $i = 0;
    use constant {
        _starting_in_quote_          => $i++,
        _ending_in_quote_            => $i++,
        _is_static_block_comment_    => $i++,
        _ri_first_                   => $i++,
        _ri_last_                    => $i++,
        _do_not_pad_                 => $i++,
        _peak_batch_size_            => $i++,
        _batch_count_                => $i++,
        _rix_seqno_controlling_ci_   => $i++,
        _batch_CODE_type_            => $i++,
        _ri_starting_one_line_block_ => $i++,
        _runmatched_opening_indexes_ => $i++,
        _lp_object_count_this_batch_ => $i++,
    };
} ## end BEGIN

BEGIN {

    # Sequence number assigned to the root of sequence tree.
    # The minimum of the actual sequences numbers is 4, so we can use 1
    use constant SEQ_ROOT => 1;

    # Codes for insertion and deletion of blanks
    use constant DELETE => 0;
    use constant STABLE => 1;
    use constant INSERT => 2;

    # whitespace codes
    use constant WS_YES      => 1;
    use constant WS_OPTIONAL => 0;
    use constant WS_NO       => -1;

    # Token bond strengths.
    use constant NO_BREAK    => 10_000;
    use constant VERY_STRONG => 100;
    use constant STRONG      => 2.1;
    use constant NOMINAL     => 1.1;
    use constant WEAK        => 0.8;
    use constant VERY_WEAK   => 0.55;

    # values for testing indexes in output array
    use constant UNDEFINED_INDEX => -1;

    # Maximum number of little messages; probably need not be changed.
    use constant MAX_NAG_MESSAGES => 6;

    # This is the decimal range of printable characters in ASCII.  It is used to
    # make quick preliminary checks before resorting to using a regex.
    use constant ORD_PRINTABLE_MIN => 33;
    use constant ORD_PRINTABLE_MAX => 126;

    # Initialize constant hashes ...
    my @q;

    @q = qw(
      = **= += *= &= <<= &&=
      -= /= |= >>= ||= //=
      .= %= ^=
      x=
    );
    @is_assignment{@q} = (1) x scalar(@q);

    # a hash needed by break_lists for efficiency:
    push @q, qw{ ; < > ~ f };
    @is_non_list_type{@q} = (1) x scalar(@q);

    @q = qw(is if unless and or err last next redo return);
    @is_if_unless_and_or_last_next_redo_return{@q} = (1) x scalar(@q);

    # These block types may have text between the keyword and opening
    # curly.  Note: 'else' does not, but must be included to allow trailing
    # if/elsif text to be appended.
    # patch for SWITCH/CASE: added 'case' and 'when'
    @q = qw(if elsif else unless while until for foreach case when catch);
    @is_if_elsif_else_unless_while_until_for_foreach{@q} =
      (1) x scalar(@q);

    @q = qw(if unless while until for foreach);
    @is_if_unless_while_until_for_foreach{@q} =
      (1) x scalar(@q);

    @q = qw(last next redo return);
    @is_last_next_redo_return{@q} = (1) x scalar(@q);

    # Map related block names into a common name to allow vertical alignment
    # used by sub make_alignment_patterns. Note: this is normally unchanged,
    # but it contains 'grep' and can be re-initialized in
    # sub initialize_grep_and_friends in a testing mode.
    %block_type_map = (
        'unless'  => 'if',
        'else'    => 'if',
        'elsif'   => 'if',
        'when'    => 'if',
        'default' => 'if',
        'case'    => 'if',
        'sort'    => 'map',
        'grep'    => 'map',
    );

    @q = qw(if unless);
    @is_if_unless{@q} = (1) x scalar(@q);

    @q = qw(if elsif);
    @is_if_elsif{@q} = (1) x scalar(@q);

    @q = qw(if unless elsif);
    @is_if_unless_elsif{@q} = (1) x scalar(@q);

    @q = qw(if unless elsif else);
    @is_if_unless_elsif_else{@q} = (1) x scalar(@q);

    @q = qw(elsif else);
    @is_elsif_else{@q} = (1) x scalar(@q);

    @q = qw(and or err);
    @is_and_or{@q} = (1) x scalar(@q);

    # Identify certain operators which often occur in chains.
    # Note: the minus (-) causes a side effect of padding of the first line in
    # something like this (by sub set_logical_padding):
    #    Checkbutton => 'Transmission checked',
    #   -variable    => \$TRANS
    # This usually improves appearance so it seems ok.
    @q = qw(&& || and or : ? . + - * /);
    @is_chain_operator{@q} = (1) x scalar(@q);

    # Operators that the user can request break before or after.
    # Note that some are keywords
    @all_operators = qw(% + - * / x != == >= <= =~ !~ < > | &
      = **= += *= &= <<= &&= -= /= |= >>= ||= //= .= %= ^= x=
      . : ? && || and or err xor
    );

    # We can remove semicolons after blocks preceded by these keywords
    @q =
      qw(BEGIN END CHECK INIT AUTOLOAD DESTROY UNITCHECK continue if elsif else
      unless while until for foreach given when default);
    @is_block_without_semicolon{@q} = (1) x scalar(@q);

    # We will allow semicolons to be added within these block types
    # as well as sub and package blocks.
    # NOTES:
    # 1. Note that these keywords are omitted:
    #     switch case given when default sort map grep
    # 2. It is also ok to add for sub and package blocks and a labeled block
    # 3. But not okay for other perltidy types including:
    #     { } ; G t
    # 4. Test files: blktype.t, blktype1.t, semicolon.t
    @q =
      qw( BEGIN END CHECK INIT AUTOLOAD DESTROY UNITCHECK continue if elsif else
      unless do while until eval for foreach );
    @ok_to_add_semicolon_for_block_type{@q} = (1) x scalar(@q);

    # 'L' is token for opening { at hash key
    @q = qw< L { ( [ >;
    @is_opening_type{@q} = (1) x scalar(@q);

    # 'R' is token for closing } at hash key
    @q = qw< R } ) ] >;
    @is_closing_type{@q} = (1) x scalar(@q);

    @q = qw< { ( [ >;
    @is_opening_token{@q} = (1) x scalar(@q);

    @q = qw< } ) ] >;
    @is_closing_token{@q} = (1) x scalar(@q);

    @q = qw( ? : );
    @is_ternary{@q} = (1) x scalar(@q);

    @q = qw< { ( [ ? >;
    @is_opening_sequence_token{@q} = (1) x scalar(@q);

    @q = qw< } ) ] : >;
    @is_closing_sequence_token{@q} = (1) x scalar(@q);

    %matching_token = (
        '{' => '}',
        '(' => ')',
        '[' => ']',
        '?' => ':',

        '}' => '{',
        ')' => '(',
        ']' => '[',
        ':' => '?',
    );

    # a hash needed by sub break_lists for labeling containers
    @q = qw( k => && || ? : . );
    @is_container_label_type{@q} = (1) x scalar(@q);

    @q = qw( die confess croak warn );
    @is_die_confess_croak_warn{@q} = (1) x scalar(@q);

    @q = qw( my our local );
    @is_my_our_local{@q} = (1) x scalar(@q);

    # Braces -bbht etc must follow these. Note: experimentation with
    # including a simple comma shows that it adds little and can lead
    # to poor formatting in complex lists.
    @q = qw( = => );
    @is_equal_or_fat_comma{@q} = (1) x scalar(@q);

    @q = qw( => ; h f );
    push @q, ',';
    @is_counted_type{@q} = (1) x scalar(@q);

    # Tokens where --keep-old-break-xxx flags make soft breaks instead
    # of hard breaks.  See b1433 and b1436.
    # NOTE: $type is used as the hash key for now; if other container tokens
    # are added it might be necessary to use a token/type mixture.
    @q = qw# -> ? : && || + - / * #;
    @is_soft_keep_break_type{@q} = (1) x scalar(@q);

    # these functions allow an identifier in the indirect object slot
    @q = qw( print printf sort exec system say);
    @is_indirect_object_taker{@q} = (1) x scalar(@q);

    # Define here tokens which may follow the closing brace of a do statement
    # on the same line, as in:
    #   } while ( $something);
    my @dof = qw(until while unless if ; : );
    push @dof, ',';
    @is_do_follower{@dof} = (1) x scalar(@dof);

    # what can follow a multi-line anonymous sub definition closing curly:
    my @asf = qw# ; : => or and  && || ~~ !~~ ) #;
    push @asf, ',';
    @is_anon_sub_brace_follower{@asf} = (1) x scalar(@asf);

    # what can follow a one-line anonymous sub closing curly:
    # one-line anonymous subs also have ']' here...
    # see tk3.t and PP.pm
    my @asf1 = qw#  ; : => or and  && || ) ] ~~ !~~ #;
    push @asf1, ',';
    @is_anon_sub_1_brace_follower{@asf1} = (1) x scalar(@asf1);

    # What can follow a closing curly of a block
    # which is not an if/elsif/else/do/sort/map/grep/eval/sub
    # Testfiles: 'Toolbar.pm', 'Menubar.pm', bless.t, '3rules.pl'
    my @obf = qw#  ; : => or and  && || ) #;
    push @obf, ',';
    @is_other_brace_follower{@obf} = (1) x scalar(@obf);

} ## end BEGIN

{    ## begin closure to count instances

    # methods to count instances
    my $_count = 0;
    sub _increment_count { return ++$_count }
    sub _decrement_count { return --$_count }
} ## end closure to count instances

sub new {

    my ( $class, @args ) = @_;

    # we are given an object with a write_line() method to take lines
    my %defaults = (
        sink_object        => undef,
        diagnostics_object => undef,
        logger_object      => undef,
        length_function    => undef,
        is_encoded_data    => EMPTY_STRING,
        fh_tee             => undef,
    );
    my %args = ( %defaults, @args );

    my $length_function    = $args{length_function};
    my $is_encoded_data    = $args{is_encoded_data};
    my $fh_tee             = $args{fh_tee};
    my $logger_object      = $args{logger_object};
    my $diagnostics_object = $args{diagnostics_object};

    # we create another object with a get_line() and peek_ahead() method
    my $sink_object = $args{sink_object};
    my $file_writer_object =
      Perl::Tidy::FileWriter->new( $sink_object, $rOpts, $logger_object );

    # initialize closure variables...
    set_logger_object($logger_object);
    set_diagnostics_object($diagnostics_object);
    initialize_lp_vars();
    initialize_csc_vars();
    initialize_break_lists();
    initialize_undo_ci();
    initialize_process_line_of_CODE();
    initialize_grind_batch_of_CODE();
    initialize_get_final_indentation();
    initialize_postponed_breakpoint();
    initialize_batch_variables();
    initialize_write_line();

    my $vertical_aligner_object = Perl::Tidy::VerticalAligner->new(
        rOpts              => $rOpts,
        file_writer_object => $file_writer_object,
        logger_object      => $logger_object,
        diagnostics_object => $diagnostics_object,
    );

    write_logfile_entry("\nStarting tokenization pass...\n");

    if ( $rOpts->{'entab-leading-whitespace'} ) {
        write_logfile_entry(
"Leading whitespace will be entabbed with $rOpts->{'entab-leading-whitespace'} spaces per tab\n"
        );
    }
    elsif ( $rOpts->{'tabs'} ) {
        write_logfile_entry("Indentation will be with a tab character\n");
    }
    else {
        write_logfile_entry(
            "Indentation will be with $rOpts->{'indent-columns'} spaces\n");
    }

    # Initialize the $self array reference.
    # To add an item, first add a constant index in the BEGIN block above.
    my $self = [];

    # Basic data structures...
    $self->[_rlines_] = [];    # = ref to array of lines of the file

    # 'rLL' = reference to the continuous liner array of all tokens in a file.
    # 'LL' stands for 'Linked List'. Using a linked list was a disaster, but
    # 'LL' stuck because it is easy to type.  The 'rLL' array is updated
    # by sub 'respace_tokens' during reformatting.  The indexes in 'rLL' begin
    # with '$K' by convention.
    $self->[_rLL_]    = [];
    $self->[_Klimit_] = undef;    # = maximum K index for rLL.

    # Indexes into the rLL list
    $self->[_K_opening_container_] = {};
    $self->[_K_closing_container_] = {};
    $self->[_K_opening_ternary_]   = {};
    $self->[_K_closing_ternary_]   = {};
    $self->[_K_first_seq_item_]    = undef; # K of first token with a sequence #

    # 'rSS' is the 'Signed Sequence' list, a continuous list of all sequence
    # numbers with + or - indicating opening or closing. This list represents
    # the entire container tree and is invariant under reformatting.  It can be
    # used to quickly travel through the tree.  Indexes in the rSS array begin
    # with '$I' by convention.  The 'Iss' arrays give the indexes in this list
    # of opening and closing sequence numbers.
    $self->[_rSS_]         = [];
    $self->[_Iss_opening_] = [];
    $self->[_Iss_closing_] = [];

    # Arrays to help traverse the tree
    $self->[_rdepth_of_opening_seqno_] = [];
    $self->[_rblock_type_of_seqno_]    = {};
    $self->[_ris_asub_block_]          = {};
    $self->[_ris_sub_block_]           = {};

    # Mostly list characteristics and processing flags
    $self->[_rtype_count_by_seqno_]      = {};
    $self->[_ris_function_call_paren_]   = {};
    $self->[_rlec_count_by_seqno_]       = {};
    $self->[_ris_broken_container_]      = {};
    $self->[_ris_permanently_broken_]    = {};
    $self->[_rblank_and_comment_count_]  = {};
    $self->[_rhas_list_]                 = {};
    $self->[_rhas_broken_list_]          = {};
    $self->[_rhas_broken_list_with_lec_] = {};
    $self->[_rfirst_comma_line_index_]   = {};
    $self->[_rhas_code_block_]           = {};
    $self->[_rhas_broken_code_block_]    = {};
    $self->[_rhas_ternary_]              = {};
    $self->[_ris_excluded_lp_container_] = {};
    $self->[_rlp_object_by_seqno_]       = {};
    $self->[_rwant_reduced_ci_]          = {};
    $self->[_rno_xci_by_seqno_]          = {};
    $self->[_rbrace_left_]               = {};
    $self->[_ris_bli_container_]         = {};
    $self->[_rparent_of_seqno_]          = {};
    $self->[_rchildren_of_seqno_]        = {};
    $self->[_ris_list_by_seqno_]         = {};
    $self->[_ris_cuddled_closing_brace_] = {};

    $self->[_rbreak_container_] = {};                 # prevent one-line blocks
    $self->[_rshort_nested_]    = {};                 # blocks not forced open
    $self->[_length_function_]  = $length_function;
    $self->[_is_encoded_data_]  = $is_encoded_data;

    # Some objects...
    $self->[_fh_tee_]                  = $fh_tee;
    $self->[_sink_object_]             = $sink_object;
    $self->[_file_writer_object_]      = $file_writer_object;
    $self->[_vertical_aligner_object_] = $vertical_aligner_object;
    $self->[_logger_object_]           = $logger_object;

    # Reference to the batch being processed
    $self->[_this_batch_] = [];

    # Memory of processed text...
    $self->[_ris_special_identifier_token_]    = {};
    $self->[_last_line_leading_level_]         = 0;
    $self->[_last_line_leading_type_]          = '#';
    $self->[_last_output_short_opening_token_] = 0;
    $self->[_added_semicolon_count_]           = 0;
    $self->[_first_added_semicolon_at_]        = 0;
    $self->[_last_added_semicolon_at_]         = 0;
    $self->[_deleted_semicolon_count_]         = 0;
    $self->[_first_deleted_semicolon_at_]      = 0;
    $self->[_last_deleted_semicolon_at_]       = 0;
    $self->[_embedded_tab_count_]              = 0;
    $self->[_first_embedded_tab_at_]           = 0;
    $self->[_last_embedded_tab_at_]            = 0;
    $self->[_first_tabbing_disagreement_]      = 0;
    $self->[_last_tabbing_disagreement_]       = 0;
    $self->[_tabbing_disagreement_count_]      = 0;
    $self->[_in_tabbing_disagreement_]         = 0;
    $self->[_saw_VERSION_in_this_file_]        = !$rOpts->{'pass-version-line'};
    $self->[_saw_END_or_DATA_]                 = 0;
    $self->[_first_brace_tabbing_disagreement_] = undef;
    $self->[_in_brace_tabbing_disagreement_]    = undef;

    # Hashes related to container welding...
    $self->[_radjusted_levels_] = [];

    # Weld data structures
    $self->[_rK_weld_left_]         = {};
    $self->[_rK_weld_right_]        = {};
    $self->[_rweld_len_right_at_K_] = {};

    # -xci stuff
    $self->[_rseqno_controlling_my_ci_] = {};
    $self->[_ris_seqno_controlling_ci_] = {};

    $self->[_rspecial_side_comment_type_]  = {};
    $self->[_maximum_level_]               = 0;
    $self->[_maximum_level_at_line_]       = 0;
    $self->[_maximum_BLOCK_level_]         = 0;
    $self->[_maximum_BLOCK_level_at_line_] = 0;

    $self->[_rKrange_code_without_comments_] = [];
    $self->[_rbreak_before_Kfirst_]          = {};
    $self->[_rbreak_after_Klast_]            = {};
    $self->[_converged_]                     = 0;

    # qw stuff
    $self->[_rstarting_multiline_qw_seqno_by_K_] = {};
    $self->[_rending_multiline_qw_seqno_by_K_]   = {};
    $self->[_rKrange_multiline_qw_by_seqno_]     = {};
    $self->[_rmultiline_qw_has_extra_level_]     = {};

    $self->[_rcollapsed_length_by_seqno_]       = {};
    $self->[_rbreak_before_container_by_seqno_] = {};
    $self->[_roverride_cab3_]                   = {};
    $self->[_ris_assigned_structure_]           = {};
    $self->[_ris_short_broken_eval_block_]      = {};
    $self->[_ris_bare_trailing_comma_by_seqno_] = {};

    $self->[_rseqno_non_indenting_brace_by_ix_] = {};
    $self->[_rmax_vertical_tightness_]          = {};

    $self->[_no_vertical_tightness_flags_] = 0;

    # This flag will be updated later by a call to get_save_logfile()
    $self->[_save_logfile_] = defined($logger_object);

    # Be sure all variables in $self have been initialized above.  To find the
    # correspondence of index numbers and array names, copy a list to a file
    # and use the unix 'nl' command to number lines 1..
    if (DEVEL_MODE) {
        my @non_existant;
        foreach ( 0 .. _LAST_SELF_INDEX_ ) {
            if ( !exists( $self->[$_] ) ) {
                push @non_existant, $_;
            }
        }
        if (@non_existant) {
            Fault("These indexes in self not initialized: (@non_existant)\n");
        }
    }

    bless $self, $class;

    # Safety check..this is not a class yet
    if ( _increment_count() > 1 ) {
        confess
"Attempt to create more than 1 object in $class, which is not a true class yet\n";
    }
    return $self;
} ## end sub new

######################################
# CODE SECTION 2: Some Basic Utilities
######################################

sub check_rLL {

    # Verify that the rLL array has not been auto-vivified
    my ( $self, $msg ) = @_;
    my $rLL    = $self->[_rLL_];
    my $Klimit = $self->[_Klimit_];
    my $num    = @{$rLL};
    if (   ( defined($Klimit) && $Klimit != $num - 1 )
        || ( !defined($Klimit) && $num > 0 ) )
    {

        # This fault can occur if the array has been accessed for an index
        # greater than $Klimit, which is the last token index.  Just accessing
        # the array above index $Klimit, not setting a value, can cause @rLL to
        # increase beyond $Klimit.  If this occurs, the problem can be located
        # by making calls to this routine at different locations in
        # sub 'finish_formatting'.
        $Klimit = 'undef' if ( !defined($Klimit) );
        $msg    = EMPTY_STRING unless $msg;
        Fault("$msg ERROR: rLL has num=$num but Klimit='$Klimit'\n");
    }
    return;
} ## end sub check_rLL

sub check_keys {
    my ( $rtest, $rvalid, $msg, $exact_match ) = @_;

    # Check the keys of a hash:
    # $rtest   = ref to hash to test
    # $rvalid  = ref to hash with valid keys

    # $msg = a message to write in case of error
    # $exact_match defines the type of check:
    #     = false: test hash must not have unknown key
    #     = true:  test hash must have exactly same keys as known hash
    my @unknown_keys =
      grep { !exists $rvalid->{$_} } keys %{$rtest};
    my @missing_keys =
      grep { !exists $rtest->{$_} } keys %{$rvalid};
    my $error = @unknown_keys;
    if ($exact_match) { $error ||= @missing_keys }
    if ($error) {
        local $LIST_SEPARATOR = ')(';
        my @expected_keys = sort keys %{$rvalid};
        @unknown_keys = sort @unknown_keys;
        Fault(<<EOM);
------------------------------------------------------------------------
Program error detected checking hash keys
Message is: '$msg'
Expected keys: (@expected_keys)
Unknown key(s): (@unknown_keys)
Missing key(s): (@missing_keys)
------------------------------------------------------------------------
EOM
    }
    return;
} ## end sub check_keys

sub check_token_array {
    my $self = shift;

    # Check for errors in the array of tokens. This is only called
    # when the DEVEL_MODE flag is set, so this Fault will only occur
    # during code development.
    my $rLL = $self->[_rLL_];
    foreach my $KK ( 0 .. @{$rLL} - 1 ) {
        my $nvars = @{ $rLL->[$KK] };
        if ( $nvars != _NVARS ) {
            my $NVARS = _NVARS;
            my $type  = $rLL->[$KK]->[_TYPE_];
            $type = '*' unless defined($type);

            # The number of variables per token node is _NVARS and was set when
            # the array indexes were generated. So if the number of variables
            # is different we have done something wrong, like not store all of
            # them in sub 'write_line' when they were received from the
            # tokenizer.
            Fault(
"number of vars for node $KK, type '$type', is $nvars but should be $NVARS"
            );
        }
        foreach my $var ( _TOKEN_, _TYPE_ ) {
            if ( !defined( $rLL->[$KK]->[$var] ) ) {
                my $iline = $rLL->[$KK]->[_LINE_INDEX_];

                # This is a simple check that each token has some basic
                # variables.  In other words, that there are no holes in the
                # array of tokens.  Sub 'write_line' pushes tokens into the
                # $rLL array, so this should guarantee no gaps.
                Fault("Undefined variable $var for K=$KK, line=$iline\n");
            }
        }
    }
    return;
} ## end sub check_token_array

{    ## begin closure check_line_hashes

    # This code checks that no auto-vivification occurs in the 'line' hash

    my %valid_line_hash;

    BEGIN {

        # These keys are defined for each line in the formatter
        # Each line must have exactly these quantities
        my @valid_line_keys = qw(
          _curly_brace_depth
          _ending_in_quote
          _guessed_indentation_level
          _line_number
          _line_text
          _line_type
          _paren_depth
          _quote_character
          _rK_range
          _square_bracket_depth
          _starting_in_quote
          _ended_in_blank_token
          _code_type

          _ci_level_0
          _level_0
          _nesting_blocks_0
          _nesting_tokens_0
        );

        @valid_line_hash{@valid_line_keys} = (1) x scalar(@valid_line_keys);
    } ## end BEGIN

    sub check_line_hashes {
        my $self   = shift;
        my $rlines = $self->[_rlines_];
        foreach my $rline ( @{$rlines} ) {
            my $iline     = $rline->{_line_number};
            my $line_type = $rline->{_line_type};
            check_keys( $rline, \%valid_line_hash,
                "Checkpoint: line number =$iline,  line_type=$line_type", 1 );
        }
        return;
    } ## end sub check_line_hashes
} ## end closure check_line_hashes

{    ## begin closure for logger routines
    my $logger_object;

    # Called once per file to initialize the logger object
    sub set_logger_object {
        $logger_object = shift;
        return;
    }

    sub get_logger_object {
        return $logger_object;
    }

    sub get_input_stream_name {
        my $input_stream_name = EMPTY_STRING;
        if ($logger_object) {
            $input_stream_name = $logger_object->get_input_stream_name();
        }
        return $input_stream_name;
    } ## end sub get_input_stream_name

    # interface to Perl::Tidy::Logger routines
    sub warning {
        my ( $msg, $msg_line_number ) = @_;
        if ($logger_object) {
            $logger_object->warning( $msg, $msg_line_number );
        }
        return;
    }

    sub complain {
        my ( $msg, $msg_line_number ) = @_;
        if ($logger_object) {
            $logger_object->complain( $msg, $msg_line_number );
        }
        return;
    } ## end sub complain

    sub write_logfile_entry {
        my @msg = @_;
        if ($logger_object) {
            $logger_object->write_logfile_entry(@msg);
        }
        return;
    } ## end sub write_logfile_entry

    sub get_saw_brace_error {
        if ($logger_object) {
            return $logger_object->get_saw_brace_error();
        }
        return;
    } ## end sub get_saw_brace_error

    sub we_are_at_the_last_line {
        if ($logger_object) {
            $logger_object->we_are_at_the_last_line();
        }
        return;
    } ## end sub we_are_at_the_last_line

} ## end closure for logger routines

{    ## begin closure for diagnostics routines
    my $diagnostics_object;

    # Called once per file to initialize the diagnostics object
    sub set_diagnostics_object {
        $diagnostics_object = shift;
        return;
    }

    # Available for debugging but not currently used:
    sub write_diagnostics {
        my ( $msg, $line_number ) = @_;
        if ($diagnostics_object) {
            $diagnostics_object->write_diagnostics( $msg, $line_number );
        }
        return;
    } ## end sub write_diagnostics
} ## end closure for diagnostics routines

sub get_convergence_check {
    my ($self) = @_;
    return $self->[_converged_];
}

sub get_output_line_number {
    my ($self) = @_;
    my $vao = $self->[_vertical_aligner_object_];
    return $vao->get_output_line_number();
}

sub want_blank_line {
    my $self = shift;
    $self->flush();
    my $file_writer_object = $self->[_file_writer_object_];
    $file_writer_object->want_blank_line();
    return;
} ## end sub want_blank_line

sub write_unindented_line {
    my ( $self, $line ) = @_;
    $self->flush();
    my $file_writer_object = $self->[_file_writer_object_];
    $file_writer_object->write_line($line);
    return;
} ## end sub write_unindented_line

sub consecutive_nonblank_lines {
    my ($self)             = @_;
    my $file_writer_object = $self->[_file_writer_object_];
    my $vao                = $self->[_vertical_aligner_object_];
    return $file_writer_object->get_consecutive_nonblank_lines() +
      $vao->get_cached_line_count();
} ## end sub consecutive_nonblank_lines

sub split_words {

    # given a string containing words separated by whitespace,
    # return the list of words
    my ($str) = @_;
    return unless $str;
    $str =~ s/\s+$//;
    $str =~ s/^\s+//;
    return split( /\s+/, $str );
} ## end sub split_words

###########################################
# CODE SECTION 3: Check and process options
###########################################

sub check_options {

    # This routine is called to check the user-supplied run parameters
    # and to configure the control hashes to them.
    $rOpts = shift;

    $controlled_comma_style = 0;

    initialize_whitespace_hashes();
    initialize_bond_strength_hashes();

    # This function must be called early to get hashes with grep initialized
    initialize_grep_and_friends();

    # Make needed regex patterns for matching text.
    # NOTE: sub_matching_patterns must be made first because later patterns use
    # them; see RT #133130.
    make_sub_matching_pattern();    # must be first pattern made
    make_static_block_comment_pattern();
    make_static_side_comment_pattern();
    make_closing_side_comment_prefix();
    make_closing_side_comment_list_pattern();
    $format_skipping_pattern_begin =
      make_format_skipping_pattern( 'format-skipping-begin', '#<<<' );
    $format_skipping_pattern_end =
      make_format_skipping_pattern( 'format-skipping-end', '#>>>' );
    make_non_indenting_brace_pattern();

    # If closing side comments ARE selected, then we can safely
    # delete old closing side comments unless closing side comment
    # warnings are requested.  This is a good idea because it will
    # eliminate any old csc's which fall below the line count threshold.
    # We cannot do this if warnings are turned on, though, because we
    # might delete some text which has been added.  So that must
    # be handled when comments are created.  And we cannot do this
    # with -io because -csc will be skipped altogether.
    if ( $rOpts->{'closing-side-comments'} ) {
        if (   !$rOpts->{'closing-side-comment-warnings'}
            && !$rOpts->{'indent-only'} )
        {
            $rOpts->{'delete-closing-side-comments'} = 1;
        }
    }

    # If closing side comments ARE NOT selected, but warnings ARE
    # selected and we ARE DELETING csc's, then we will pretend to be
    # adding with a huge interval.  This will force the comments to be
    # generated for comparison with the old comments, but not added.
    elsif ( $rOpts->{'closing-side-comment-warnings'} ) {
        if ( $rOpts->{'delete-closing-side-comments'} ) {
            $rOpts->{'delete-closing-side-comments'}  = 0;
            $rOpts->{'closing-side-comments'}         = 1;
            $rOpts->{'closing-side-comment-interval'} = 100_000_000;
        }
    }
    else {
        ## ok - no -csc issues
    }

    my $comment = $rOpts->{'add-missing-else-comment'};
    if ( !$comment ) {
        $comment = "##FIXME - added with perltidy -ame";
    }
    else {
        $comment = substr( $comment, 0, 60 );
        $comment =~ s/^\s+//;
        $comment =~ s/\s+$//;
        $comment =~ s/\n/ /g;
        if ( substr( $comment, 0, 1 ) ne '#' ) {
            $comment = '#' . $comment;
        }
    }
    $rOpts->{'add-missing-else-comment'} = $comment;

    make_bli_pattern();

    make_bl_pattern();

    make_block_brace_vertical_tightness_pattern();

    make_blank_line_pattern();

    make_keyword_group_list_pattern();

    prepare_cuddled_block_types();

    if ( $rOpts->{'dump-cuddled-block-list'} ) {
        dump_cuddled_block_list(*STDOUT);
        Exit(0);
    }

    # -xlp implies -lp
    if ( $rOpts->{'extended-line-up-parentheses'} ) {
        $rOpts->{'line-up-parentheses'} ||= 1;
    }

    if ( $rOpts->{'line-up-parentheses'} ) {

        if (   $rOpts->{'indent-only'}
            || !$rOpts->{'add-newlines'}
            || !$rOpts->{'delete-old-newlines'} )
        {
            Warn(<<EOM);
-----------------------------------------------------------------------
Conflict: -lp  conflicts with -io, -fnl, -nanl, or -ndnl; ignoring -lp

The -lp indentation logic requires that perltidy be able to coordinate
arbitrarily large numbers of line breakpoints.  This isn't possible
with these flags.
-----------------------------------------------------------------------
EOM
            $rOpts->{'line-up-parentheses'}          = 0;
            $rOpts->{'extended-line-up-parentheses'} = 0;
        }

        if ( $rOpts->{'whitespace-cycle'} ) {
            Warn(<<EOM);
Conflict: -wc cannot currently be used with the -lp option; ignoring -wc
EOM
            $rOpts->{'whitespace-cycle'} = 0;
        }
    }

    # At present, tabs are not compatible with the line-up-parentheses style
    # (it would be possible to entab the total leading whitespace
    # just prior to writing the line, if desired).
    if ( $rOpts->{'line-up-parentheses'} && $rOpts->{'tabs'} ) {
        Warn(<<EOM);
Conflict: -t (tabs) cannot be used with the -lp  option; ignoring -t; see -et.
EOM
        $rOpts->{'tabs'} = 0;
    }

    # Likewise, tabs are not compatible with outdenting..
    if ( $rOpts->{'outdent-keywords'} && $rOpts->{'tabs'} ) {
        Warn(<<EOM);
Conflict: -t (tabs) cannot be used with the -okw options; ignoring -t; see -et.
EOM
        $rOpts->{'tabs'} = 0;
    }

    if ( $rOpts->{'outdent-labels'} && $rOpts->{'tabs'} ) {
        Warn(<<EOM);
Conflict: -t (tabs) cannot be used with the -ola  option; ignoring -t; see -et.
EOM
        $rOpts->{'tabs'} = 0;
    }

    if ( !$rOpts->{'space-for-semicolon'} ) {
        $want_left_space{'f'} = -1;
    }

    if ( $rOpts->{'space-terminal-semicolon'} ) {
        $want_left_space{';'} = 1;
    }

    # We should put an upper bound on any -sil=n value. Otherwise enormous
    # files could be created by mistake.
    for ( $rOpts->{'starting-indentation-level'} ) {
        if ( $_ && $_ > 100 ) {
            Warn(<<EOM);
The value --starting-indentation-level=$_ is very large; a mistake? resetting to 0;
EOM
            $_ = 0;
        }
    }

    # Require -msp > 0 to avoid future parsing problems (issue c147)
    for ( $rOpts->{'minimum-space-to-comment'} ) {
        if ( !$_ || $_ <= 0 ) { $_ = 1 }
    }

    # implement outdenting preferences for keywords
    %outdent_keyword = ();
    my @okw = split_words( $rOpts->{'outdent-keyword-list'} );
    if ( !@okw ) {
        @okw = qw(next last redo goto return);    # defaults
    }

    # FUTURE: if not a keyword, assume that it is an identifier
    foreach (@okw) {
        if ( Perl::Tidy::Tokenizer::is_keyword($_) ) {
            $outdent_keyword{$_} = 1;
        }
        else {
            Warn("ignoring '$_' in -okwl list; not a perl keyword");
        }
    }

    # setup hash for -kpit option
    %keyword_paren_inner_tightness = ();
    my $kpit_value = $rOpts->{'keyword-paren-inner-tightness'};
    if ( defined($kpit_value) && $kpit_value != 1 ) {
        my @kpit =
          split_words( $rOpts->{'keyword-paren-inner-tightness-list'} );
        if ( !@kpit ) {
            @kpit = qw(if elsif unless while until for foreach);    # defaults
        }

        # we will allow keywords and user-defined identifiers
        foreach (@kpit) {
            $keyword_paren_inner_tightness{$_} = $kpit_value;
        }
    }

    # implement user whitespace preferences
    if ( my @q = split_words( $rOpts->{'want-left-space'} ) ) {
        @want_left_space{@q} = (1) x scalar(@q);
    }

    if ( my @q = split_words( $rOpts->{'want-right-space'} ) ) {
        @want_right_space{@q} = (1) x scalar(@q);
    }

    if ( my @q = split_words( $rOpts->{'nowant-left-space'} ) ) {
        @want_left_space{@q} = (-1) x scalar(@q);
    }

    if ( my @q = split_words( $rOpts->{'nowant-right-space'} ) ) {
        @want_right_space{@q} = (-1) x scalar(@q);
    }
    if ( $rOpts->{'dump-want-left-space'} ) {
        dump_want_left_space(*STDOUT);
        Exit(0);
    }

    if ( $rOpts->{'dump-want-right-space'} ) {
        dump_want_right_space(*STDOUT);
        Exit(0);
    }

    initialize_space_after_keyword();

    initialize_extended_block_tightness_list();

    initialize_token_break_preferences();

    #--------------------------------------------------------------
    # The combination -lp -iob -vmll -bbx=2 can be unstable (b1266)
    #--------------------------------------------------------------
    # The -vmll and -lp parameters do not really work well together.
    # To avoid instabilities, we will change any -bbx=2 to -bbx=1 (stable).
    # NOTE: we could make this more precise by looking at any exclusion
    # flags for -lp, and allowing -bbx=2 for excluded types.
    if (   $rOpts->{'variable-maximum-line-length'}
        && $rOpts->{'ignore-old-breakpoints'}
        && $rOpts->{'line-up-parentheses'} )
    {
        my @changed;
        foreach my $key ( keys %break_before_container_types ) {
            if ( $break_before_container_types{$key} == 2 ) {
                $break_before_container_types{$key} = 1;
                push @changed, $key;
            }
        }
        if (@changed) {

            # we could write a warning here
        }
    }

    #-----------------------------------------------------------
    # The combination -lp -vmll can be unstable if -ci<2 (b1267)
    #-----------------------------------------------------------
    # The -vmll and -lp parameters do not really work well together.
    # This is a very crude fix for an unusual parameter combination.
    if (   $rOpts->{'variable-maximum-line-length'}
        && $rOpts->{'line-up-parentheses'}
        && $rOpts->{'continuation-indentation'} < 2 )
    {
        $rOpts->{'continuation-indentation'} = 2;
        ##Warn("Increased -ci=n to n=2 for stability with -lp and -vmll\n");
    }

    #-----------------------------------------------------------
    # The combination -lp -vmll -atc -dtc can be unstable
    #-----------------------------------------------------------
    # This fixes b1386 b1387 b1388 which had -wtc='b'
    # Updated to to include any -wtc to fix b1426
    if (   $rOpts->{'variable-maximum-line-length'}
        && $rOpts->{'line-up-parentheses'}
        && $rOpts->{'add-trailing-commas'}
        && $rOpts->{'delete-trailing-commas'}
        && $rOpts->{'want-trailing-commas'} )
    {
        $rOpts->{'delete-trailing-commas'} = 0;
## Issuing a warning message causes trouble with test cases, and this combo is
## so rare that it is unlikely to not occur in practice. So skip warning.
##        Warn(
##"The combination -vmll -lp -atc -dtc can be unstable; turning off -dtc\n"
##        );
    }

    %container_indentation_options = ();
    foreach my $pair (
        [ 'break-before-hash-brace-and-indent',     '{' ],
        [ 'break-before-square-bracket-and-indent', '[' ],
        [ 'break-before-paren-and-indent',          '(' ],
      )
    {
        my ( $key, $tok ) = @{$pair};
        my $opt = $rOpts->{$key};
        if ( defined($opt) && $opt > 0 && $break_before_container_types{$tok} )
        {

            # (1) -lp is not compatible with opt=2, silently set to opt=0
            # (2) opt=0 and 2 give same result if -i=-ci; but opt=0 is faster
            # (3) set opt=0 if -i < -ci (can be unstable, case b1355)
            if ( $opt == 2 ) {
                if (
                    $rOpts->{'line-up-parentheses'}
                    || ( $rOpts->{'indent-columns'} <=
                        $rOpts->{'continuation-indentation'} )
                  )
                {
                    $opt = 0;
                }
            }
            $container_indentation_options{$tok} = $opt;
        }
    }

    $right_bond_strength{'{'} = WEAK;
    $left_bond_strength{'{'}  = VERY_STRONG;

    # make -l=0 equal to -l=infinite
    if ( !$rOpts->{'maximum-line-length'} ) {
        $rOpts->{'maximum-line-length'} = 1_000_000;
    }

    # make -lbl=0 equal to -lbl=infinite
    if ( !$rOpts->{'long-block-line-count'} ) {
        $rOpts->{'long-block-line-count'} = 1_000_000;
    }

    # hashes used to simplify setting whitespace
    %tightness = (
        '{' => $rOpts->{'brace-tightness'},
        '}' => $rOpts->{'brace-tightness'},
        '(' => $rOpts->{'paren-tightness'},
        ')' => $rOpts->{'paren-tightness'},
        '[' => $rOpts->{'square-bracket-tightness'},
        ']' => $rOpts->{'square-bracket-tightness'},
    );

    if ( $rOpts->{'ignore-old-breakpoints'} ) {

        my @conflicts;
        if ( $rOpts->{'break-at-old-method-breakpoints'} ) {
            $rOpts->{'break-at-old-method-breakpoints'} = 0;
            push @conflicts, '--break-at-old-method-breakpoints (-bom)';
        }
        if ( $rOpts->{'break-at-old-comma-breakpoints'} ) {
            $rOpts->{'break-at-old-comma-breakpoints'} = 0;
            push @conflicts, '--break-at-old-comma-breakpoints (-boc)';
        }
        if ( $rOpts->{'break-at-old-semicolon-breakpoints'} ) {
            $rOpts->{'break-at-old-semicolon-breakpoints'} = 0;
            push @conflicts, '--break-at-old-semicolon-breakpoints (-bos)';
        }
        if ( $rOpts->{'keep-old-breakpoints-before'} ) {
            $rOpts->{'keep-old-breakpoints-before'} = EMPTY_STRING;
            push @conflicts, '--keep-old-breakpoints-before (-kbb)';
        }
        if ( $rOpts->{'keep-old-breakpoints-after'} ) {
            $rOpts->{'keep-old-breakpoints-after'} = EMPTY_STRING;
            push @conflicts, '--keep-old-breakpoints-after (-kba)';
        }

        if (@conflicts) {
            my $msg = join( "\n  ",
" Conflict: These conflicts with --ignore-old-breakponts (-iob) will be turned off:",
                @conflicts )
              . "\n";
            Warn($msg);
        }

        # Note: These additional parameters are made inactive by -iob.
        # They are silently turned off here because they are on by default.
        # We would generate unexpected warnings if we issued a warning.
        $rOpts->{'break-at-old-keyword-breakpoints'}   = 0;
        $rOpts->{'break-at-old-logical-breakpoints'}   = 0;
        $rOpts->{'break-at-old-ternary-breakpoints'}   = 0;
        $rOpts->{'break-at-old-attribute-breakpoints'} = 0;
    }

    %keep_break_before_type = ();
    initialize_keep_old_breakpoints( $rOpts->{'keep-old-breakpoints-before'},
        'kbb', \%keep_break_before_type );

    %keep_break_after_type = ();
    initialize_keep_old_breakpoints( $rOpts->{'keep-old-breakpoints-after'},
        'kba', \%keep_break_after_type );

    # Modify %keep_break_before and %keep_break_after to avoid conflicts
    # with %want_break_before; fixes b1436.
    # This became necessary after breaks for some tokens were converted
    # from hard to soft (see b1433).
    # We could do this for all tokens, but to minimize changes to existing
    # code we currently only do this for the soft break tokens.
    foreach my $key ( keys %keep_break_before_type ) {
        if (   defined( $want_break_before{$key} )
            && !$want_break_before{$key}
            && $is_soft_keep_break_type{$key} )
        {
            $keep_break_after_type{$key} = $keep_break_before_type{$key};
            delete $keep_break_before_type{$key};
        }
    }
    foreach my $key ( keys %keep_break_after_type ) {
        if (   defined( $want_break_before{$key} )
            && $want_break_before{$key}
            && $is_soft_keep_break_type{$key} )
        {
            $keep_break_before_type{$key} = $keep_break_after_type{$key};
            delete $keep_break_after_type{$key};
        }
    }

    $controlled_comma_style ||= $keep_break_before_type{','};
    $controlled_comma_style ||= $keep_break_after_type{','};

    initialize_global_option_vars();

    initialize_line_length_vars();    # after 'initialize_global_option_vars'

    initialize_trailing_comma_rules();    # after 'initialize_line_length_vars'

    initialize_weld_nested_exclusion_rules();

    initialize_weld_fat_comma_rules();

    %line_up_parentheses_control_hash    = ();
    $line_up_parentheses_control_is_lxpl = 1;
    my $lpxl = $rOpts->{'line-up-parentheses-exclusion-list'};
    my $lpil = $rOpts->{'line-up-parentheses-inclusion-list'};
    if ( $lpxl && $lpil ) {
        Warn( <<EOM );
You entered values for both -lpxl=s and -lpil=s; the -lpil list will be ignored
EOM
    }
    if ($lpxl) {
        $line_up_parentheses_control_is_lxpl = 1;
        initialize_line_up_parentheses_control_hash(
            $rOpts->{'line-up-parentheses-exclusion-list'}, 'lpxl' );
    }
    elsif ($lpil) {
        $line_up_parentheses_control_is_lxpl = 0;
        initialize_line_up_parentheses_control_hash(
            $rOpts->{'line-up-parentheses-inclusion-list'}, 'lpil' );
    }
    else {
        ## ok - neither -lpxl nor -lpil
    }

    return;
} ## end sub check_options

use constant ALIGN_GREP_ALIASES => 0;

sub initialize_grep_and_friends {

    # Initialize or re-initialize hashes with 'grep' and grep aliases. This
    # must be done after each set of options because new grep aliases may be
    # used.

    # re-initialize the hashes ... this is critical!
    %is_sort_map_grep = ();

    my @q = qw(sort map grep);
    @is_sort_map_grep{@q} = (1) x scalar(@q);

    my $olbxl = $rOpts->{'one-line-block-exclusion-list'};
    my %is_olb_exclusion_word;
    if ( defined($olbxl) ) {
        my @list = split_words($olbxl);
        if (@list) {
            @is_olb_exclusion_word{@list} = (1) x scalar(@list);
        }
    }

    # Make the list of block types which may be re-formed into one line.
    # They will be modified with the grep-alias-list below and
    # by sub 'prepare_cuddled_block_types'.
    # Note that it is essential to always re-initialize the hash here:
    %want_one_line_block = ();
    if ( !$is_olb_exclusion_word{'*'} ) {
        foreach (qw(sort map grep eval)) {
            if ( !$is_olb_exclusion_word{$_} ) { $want_one_line_block{$_} = 1 }
        }
    }

    # Note that any 'grep-alias-list' string has been preprocessed to be a
    # trimmed, space-separated list.
    my $str = $rOpts->{'grep-alias-list'};
    my @grep_aliases = split /\s+/, $str;

    if (@grep_aliases) {

        @{is_sort_map_grep}{@grep_aliases} = (1) x scalar(@grep_aliases);

        if ( $want_one_line_block{'grep'} ) {
            @{want_one_line_block}{@grep_aliases} = (1) x scalar(@grep_aliases);
        }
    }

    ##@q = qw(sort map grep eval);
    %is_sort_map_grep_eval = %is_sort_map_grep;
    $is_sort_map_grep_eval{'eval'} = 1;

    ##@q = qw(sort map grep eval do);
    %is_sort_map_grep_eval_do = %is_sort_map_grep_eval;
    $is_sort_map_grep_eval_do{'do'} = 1;

    # These block types can take ci.  This is used by the -xci option.
    # Note that the 'sub' in this list is an anonymous sub.  To be more correct
    # we could remove sub and use ASUB pattern to also handle a
    # prototype/signature.  But that would slow things down and would probably
    # never be useful.
    ##@q = qw( do sub eval sort map grep );
    %is_block_with_ci = %is_sort_map_grep_eval_do;
    $is_block_with_ci{'sub'} = 1;

    %is_keyword_returning_list = ();
    @q                         = qw(
      grep
      keys
      map
      reverse
      sort
      split
    );
    push @q, @grep_aliases;
    @is_keyword_returning_list{@q} = (1) x scalar(@q);

    # This code enables vertical alignment of grep aliases for testing.  It has
    # not been found to be beneficial, so it is off by default.  But it is
    # useful for precise testing of the grep alias coding.
    if (ALIGN_GREP_ALIASES) {
        %block_type_map = (
            'unless'  => 'if',
            'else'    => 'if',
            'elsif'   => 'if',
            'when'    => 'if',
            'default' => 'if',
            'case'    => 'if',
            'sort'    => 'map',
            'grep'    => 'map',
        );
        foreach (@q) {
            $block_type_map{$_} = 'map' unless ( $_ eq 'map' );
        }
    }
    return;
} ## end sub initialize_grep_and_friends

sub initialize_weld_nested_exclusion_rules {
    %weld_nested_exclusion_rules = ();

    my $opt_name = 'weld-nested-exclusion-list';
    my $str      = $rOpts->{$opt_name};
    return unless ($str);
    $str =~ s/^\s+//;
    $str =~ s/\s+$//;
    return unless ($str);

    # There are four container tokens.
    my %token_keys = (
        '(' => '(',
        '[' => '[',
        '{' => '{',
        'q' => 'q',
    );

    # We are parsing an exclusion list for nested welds. The list is a string
    # with spaces separating any number of items.  Each item consists of three
    # pieces of information:
    # <optional position> <optional type> <type of container>
    # <     ^ or .      > <    k or K   > <     ( [ {       >

    # The last character is the required container type and must be one of:
    # ( = paren
    # [ = square bracket
    # { = brace

    # An optional leading position indicator:
    # ^ means the leading token position in the weld
    # . means a secondary token position in the weld
    #   no position indicator means all positions match

    # An optional alphanumeric character between the position and container
    # token selects to which the rule applies:
    # k = any keyword
    # K = any non-keyword
    # f = function call
    # F = not a function call
    # w = function or keyword
    # W = not a function or keyword
    #     no letter means any preceding type matches

    # Examples:
    # ^(  - the weld must not start with a paren
    # .(  - the second and later tokens may not be parens
    # (   - no parens in weld
    # ^K(  - exclude a leading paren not preceded by a keyword
    # .k(  - exclude a secondary paren preceded by a keyword
    # [ {  - exclude all brackets and braces

    my @items = split /\s+/, $str;
    my $msg1;
    my $msg2;
    foreach my $item (@items) {
        my $item_save = $item;
        my $tok       = chop($item);
        my $key       = $token_keys{$tok};
        if ( !defined($key) ) {
            $msg1 .= " '$item_save'";
            next;
        }
        if ( !defined( $weld_nested_exclusion_rules{$key} ) ) {
            $weld_nested_exclusion_rules{$key} = [];
        }
        my $rflags = $weld_nested_exclusion_rules{$key};

        # A 'q' means do not weld quotes
        if ( $tok eq 'q' ) {
            $rflags->[0] = '*';
            $rflags->[1] = '*';
            next;
        }

        my $pos    = '*';
        my $select = '*';
        if ($item) {
            if ( $item =~ /^([\^\.])?([kKfFwW])?$/ ) {
                $pos    = $1 if ($1);
                $select = $2 if ($2);
            }
            else {
                $msg1 .= " '$item_save'";
                next;
            }
        }

        my $err;
        if ( $pos eq '^' || $pos eq '*' ) {
            if ( defined( $rflags->[0] ) && $rflags->[0] ne $select ) {
                $err = 1;
            }
            $rflags->[0] = $select;
        }
        if ( $pos eq '.' || $pos eq '*' ) {
            if ( defined( $rflags->[1] ) && $rflags->[1] ne $select ) {
                $err = 1;
            }
            $rflags->[1] = $select;
        }
        if ($err) { $msg2 .= " '$item_save'"; }
    }
    if ($msg1) {
        Warn(<<EOM);
Unexpecting symbol(s) encountered in --$opt_name will be ignored:
$msg1
EOM
    }
    if ($msg2) {
        Warn(<<EOM);
Multiple specifications were encountered in the --weld-nested-exclusion-list for:
$msg2
Only the last will be used.
EOM
    }
    return;
} ## end sub initialize_weld_nested_exclusion_rules

sub initialize_weld_fat_comma_rules {

    # Initialize a hash controlling which opening token types can be
    # welded around a fat comma
    %weld_fat_comma_rules = ();

    # The -wfc flag turns on welding of '=>' after an opening paren
    if ( $rOpts->{'weld-fat-comma'} ) { $weld_fat_comma_rules{'('} = 1 }

    # This could be generalized in the future by introducing a parameter
    # -weld-fat-comma-after=str (-wfca=str), where str contains any of:
    #    * { [ (
    # to indicate which opening parens may weld to a subsequent '=>'

    # The flag -wfc would then be equivalent to -wfca='('

    # This has not been done because it is not yet clear how useful
    # this generalization would be.
    return;
} ## end sub initialize_weld_fat_comma_rules

sub initialize_line_up_parentheses_control_hash {
    my ( $str, $opt_name ) = @_;
    return unless ($str);
    $str =~ s/^\s+//;
    $str =~ s/\s+$//;
    return unless ($str);

    # The format is space separated items, where each item must consist of a
    # string with a token type preceded by an optional text token and followed
    # by an integer:
    # For example:
    #    W(1
    #  = (flag1)(key)(flag2), where
    #    flag1 = 'W'
    #    key = '('
    #    flag2 = '1'

    my @items = split /\s+/, $str;
    my $msg1;
    my $msg2;
    foreach my $item (@items) {
        my $item_save = $item;
        my ( $flag1, $key, $flag2 );
        if ( $item =~ /^([^\(\]\{]*)?([\(\{\[])(\d)?$/ ) {
            $flag1 = $1 if $1;
            $key   = $2 if $2;
            $flag2 = $3 if $3;
        }
        else {
            $msg1 .= " '$item_save'";
            next;
        }

        if ( !defined($key) ) {
            $msg1 .= " '$item_save'";
            next;
        }

        # Check for valid flag1
        if ( !defined($flag1) ) { $flag1 = '*' }

        if ( $flag1 !~ /^[kKfFwW\*]$/ ) {
            $msg1 .= " '$item_save'";
            next;
        }

        # Check for valid flag2
        # 0 or blank: ignore container contents
        # 1 all containers with sublists match
        # 2 all containers with sublists, code blocks or ternary operators match
        # ... this could be extended in the future
        if ( !defined($flag2) ) { $flag2 = 0 }

        if ( $flag2 !~ /^[012]$/ ) {
            $msg1 .= " '$item_save'";
            next;
        }

        if ( !defined( $line_up_parentheses_control_hash{$key} ) ) {
            $line_up_parentheses_control_hash{$key} = [ $flag1, $flag2 ];
            next;
        }

        # check for multiple conflicting specifications
        my $rflags = $line_up_parentheses_control_hash{$key};
        my $err;
        if ( defined( $rflags->[0] ) && $rflags->[0] ne $flag1 ) {
            $err = 1;
            $rflags->[0] = $flag1;
        }
        if ( defined( $rflags->[1] ) && $rflags->[1] ne $flag2 ) {
            $err = 1;
            $rflags->[1] = $flag2;
        }
        $msg2 .= " '$item_save'" if ($err);
        next;
    }
    if ($msg1) {
        Warn(<<EOM);
Unexpecting symbol(s) encountered in --$opt_name will be ignored:
$msg1
EOM
    }
    if ($msg2) {
        Warn(<<EOM);
Multiple specifications were encountered in the $opt_name at:
$msg2
Only the last will be used.
EOM
    }

    # Speedup: we can turn off -lp if it is not actually used
    if ($line_up_parentheses_control_is_lxpl) {
        my $all_off = 1;
        foreach my $key (qw# ( { [ #) {
            my $rflags = $line_up_parentheses_control_hash{$key};
            if ( defined($rflags) ) {
                my ( $flag1, $flag2 ) = @{$rflags};
                if ( $flag1 && $flag1 ne '*' ) { $all_off = 0; last }
                if ($flag2)                    { $all_off = 0; last }
            }
        }
        if ($all_off) {
            $rOpts->{'line-up-parentheses'} = EMPTY_STRING;
        }
    }

    return;
} ## end sub initialize_line_up_parentheses_control_hash

sub initialize_space_after_keyword {

    # default keywords for which space is introduced before an opening paren
    # (at present, including them messes up vertical alignment)
    my @sak = qw(my local our and or xor err eq ne if else elsif until
      unless while for foreach return switch case given when catch);
    %space_after_keyword = map { $_ => 1 } @sak;

    # first remove any or all of these if desired
    if ( my @q = split_words( $rOpts->{'nospace-after-keyword'} ) ) {

        # -nsak='*' selects all the above keywords
        if ( @q == 1 && $q[0] eq '*' ) { @q = keys(%space_after_keyword) }
        @space_after_keyword{@q} = (0) x scalar(@q);
    }

    # then allow user to add to these defaults
    if ( my @q = split_words( $rOpts->{'space-after-keyword'} ) ) {
        @space_after_keyword{@q} = (1) x scalar(@q);
    }

    return;
} ## end sub initialize_space_after_keyword

sub initialize_extended_block_tightness_list {

    # Setup the control hash for --extended-block-tightness

    # keywords taking indirect objects:
    my @k_list = keys %is_indirect_object_taker;

    # type symbols which may precede an opening block brace
    my @t_list = qw($ @ % & *);
    push @t_list, '$#';

    my @all = ( @k_list, @t_list );

    # We will build the selection in %hash
    # By default the option is 'on' for keywords only (-xbtl='k')
    my %hash;
    @hash{@k_list} = (1) x scalar(@k_list);
    @hash{@t_list} = (0) x scalar(@t_list);

    # This can be overridden with -xbtl="..."
    my $long_name = 'extended-block-tightness-list';
    if ( $rOpts->{$long_name} ) {
        my @words = split_words( $rOpts->{$long_name} );
        my @unknown;

        # Turn everything off
        @hash{@all} = (0) x scalar(@all);

        # Then turn on selections
        foreach my $word (@words) {

            # 'print' etc turns on a specific word or symbol
            if ( defined( $hash{$word} ) ) { $hash{$word} = 1; }

            # 'k' turns on all keywords
            elsif ( $word eq 'k' ) {
                @hash{@k_list} = (1) x scalar(@k_list);
            }

            # 't' turns on all symbols
            elsif ( $word eq 't' ) {
                @hash{@t_list} = (1) x scalar(@t_list);
            }

            # 'kt' same as 'k' and 't' for convenience
            elsif ( $word eq 'kt' ) {
                @hash{@all} = (1) x scalar(@all);
            }

            # Anything else is an error
            else { push @unknown, $word }
        }
        if (@unknown) {
            my $num = @unknown;
            local $LIST_SEPARATOR = SPACE;
            Warn(<<EOM);
$num unrecognized keyword(s) were input with --$long_name :
@unknown
EOM
        }
    }

    # Transfer the result to the global hash
    %extended_block_tightness_list = %hash;

    return;
} ## end sub initialize_extended_block_tightness_list

sub initialize_token_break_preferences {

    # implement user break preferences
    my $break_after = sub {
        my @toks = @_;
        foreach my $tok (@toks) {
            if ( $tok eq '?' ) { $tok = ':' }    # patch to coordinate ?/:
            if ( $tok eq ',' ) { $controlled_comma_style = 1 }
            my $lbs = $left_bond_strength{$tok};
            my $rbs = $right_bond_strength{$tok};
            if ( defined($lbs) && defined($rbs) && $lbs < $rbs ) {
                ( $right_bond_strength{$tok}, $left_bond_strength{$tok} ) =
                  ( $lbs, $rbs );
            }
        }
        return;
    };

    my $break_before = sub {
        my @toks = @_;
        foreach my $tok (@toks) {
            if ( $tok eq ',' ) { $controlled_comma_style = 1 }
            my $lbs = $left_bond_strength{$tok};
            my $rbs = $right_bond_strength{$tok};
            if ( defined($lbs) && defined($rbs) && $rbs < $lbs ) {
                ( $right_bond_strength{$tok}, $left_bond_strength{$tok} ) =
                  ( $lbs, $rbs );
            }
        }
        return;
    };

    $break_after->(@all_operators) if ( $rOpts->{'break-after-all-operators'} );
    $break_before->(@all_operators)
      if ( $rOpts->{'break-before-all-operators'} );

    $break_after->( split_words( $rOpts->{'want-break-after'} ) );
    $break_before->( split_words( $rOpts->{'want-break-before'} ) );

    # make note if breaks are before certain key types
    %want_break_before = ();
    foreach my $tok ( @all_operators, ',' ) {
        $want_break_before{$tok} =
          $left_bond_strength{$tok} < $right_bond_strength{$tok};
    }

    # Coordinate ?/: breaks, which must be similar
    # The small strength 0.01 which is added is 1% of the strength of one
    # indentation level and seems to work okay.
    if ( !$want_break_before{':'} ) {
        $want_break_before{'?'}   = $want_break_before{':'};
        $right_bond_strength{'?'} = $right_bond_strength{':'} + 0.01;
        $left_bond_strength{'?'}  = NO_BREAK;
    }

    # Only make a hash entry for the next parameters if values are defined.
    # That allows a quick check to be made later.
    %break_before_container_types = ();
    for ( $rOpts->{'break-before-hash-brace'} ) {
        $break_before_container_types{'{'} = $_ if $_ && $_ > 0;
    }
    for ( $rOpts->{'break-before-square-bracket'} ) {
        $break_before_container_types{'['} = $_ if $_ && $_ > 0;
    }
    for ( $rOpts->{'break-before-paren'} ) {
        $break_before_container_types{'('} = $_ if $_ && $_ > 0;
    }
    return;
} ## end sub initialize_token_break_preferences

use constant DEBUG_KB => 0;

sub initialize_keep_old_breakpoints {
    my ( $str, $short_name, $rkeep_break_hash ) = @_;
    return unless $str;

    my %flags = ();
    my @list  = split_words($str);
    if ( DEBUG_KB && @list ) {
        local $LIST_SEPARATOR = SPACE;
        print <<EOM;
DEBUG_KB entering for '$short_name' with str=$str\n";
list is: @list;
EOM
    }

    # Ignore kbb='(' and '[' and '{': can cause unstable math formatting
    # (issues b1346, b1347, b1348) and likewise ignore kba=')' and ']' and '}'
    # Also always ignore ? and : (b1440 and b1433-b1439)
    if ( $short_name eq 'kbb' ) {
        @list = grep { !m/[\(\[\{\?\:]/ } @list;
    }
    elsif ( $short_name eq 'kba' ) {
        @list = grep { !m/[\)\]\}\?\:]/ } @list;
    }
    else {
        Fault(<<EOM);
Bad call arg - received short name '$short_name' but expecting 'kbb' or 'kba'
EOM
    }

    # pull out any any leading container code, like f( or *{
    # For example: 'f(' becomes flags hash entry '(' => 'f'
    foreach my $item (@list) {
        if ( $item =~ /^( [ \w\* ] )( [ \{\(\[\}\)\] ] )$/x ) {
            $item = $2;
            $flags{$2} = $1;
        }
    }

    my @unknown_types;
    foreach my $type (@list) {
        if ( !Perl::Tidy::Tokenizer::is_valid_token_type($type) ) {
            push @unknown_types, $type;
        }
    }

    if (@unknown_types) {
        my $num = @unknown_types;
        local $LIST_SEPARATOR = SPACE;
        Warn(<<EOM);
$num unrecognized token types were input with --$short_name :
@unknown_types
EOM
    }

    @{$rkeep_break_hash}{@list} = (1) x scalar(@list);

    foreach my $key ( keys %flags ) {
        my $flag = $flags{$key};

        if ( length($flag) != 1 ) {
            Warn(<<EOM);
Multiple entries given for '$key' in '$short_name'
EOM
        }
        elsif ( ( $key eq '(' || $key eq ')' ) && $flag !~ /^[kKfFwW\*]$/ ) {
            Warn(<<EOM);
Unknown flag '$flag' given for '$key' in '$short_name'
EOM
        }
        elsif ( ( $key eq '}' || $key eq '}' ) && $flag !~ /^[bB\*]$/ ) {
            Warn(<<EOM);
Unknown flag '$flag' given for '$key' in '$short_name'
EOM
        }
        else {
            ## ok - no error seen
        }

        $rkeep_break_hash->{$key} = $flag;
    }

    if ( DEBUG_KB && @list ) {
        my @tmp = %flags;
        local $LIST_SEPARATOR = SPACE;
        print <<EOM;

DEBUG_KB -$short_name flag: $str
final keys:  @list
special flags:  @tmp
EOM

    }

    return;

} ## end sub initialize_keep_old_breakpoints

sub initialize_global_option_vars {

    #------------------------------------------------------------
    # Make global vars for frequently used options for efficiency
    #------------------------------------------------------------

    $rOpts_add_newlines        = $rOpts->{'add-newlines'};
    $rOpts_add_trailing_commas = $rOpts->{'add-trailing-commas'};
    $rOpts_add_whitespace      = $rOpts->{'add-whitespace'};
    $rOpts_blank_lines_after_opening_block =
      $rOpts->{'blank-lines-after-opening-block'};
    $rOpts_block_brace_tightness = $rOpts->{'block-brace-tightness'};
    $rOpts_block_brace_vertical_tightness =
      $rOpts->{'block-brace-vertical-tightness'};
    $rOpts_brace_follower_vertical_tightness =
      $rOpts->{'brace-follower-vertical-tightness'};
    $rOpts_break_after_labels = $rOpts->{'break-after-labels'};
    $rOpts_break_at_old_attribute_breakpoints =
      $rOpts->{'break-at-old-attribute-breakpoints'};
    $rOpts_break_at_old_comma_breakpoints =
      $rOpts->{'break-at-old-comma-breakpoints'};
    $rOpts_break_at_old_keyword_breakpoints =
      $rOpts->{'break-at-old-keyword-breakpoints'};
    $rOpts_break_at_old_logical_breakpoints =
      $rOpts->{'break-at-old-logical-breakpoints'};
    $rOpts_break_at_old_semicolon_breakpoints =
      $rOpts->{'break-at-old-semicolon-breakpoints'};
    $rOpts_break_at_old_ternary_breakpoints =
      $rOpts->{'break-at-old-ternary-breakpoints'};
    $rOpts_break_open_compact_parens = $rOpts->{'break-open-compact-parens'};
    $rOpts_closing_side_comments     = $rOpts->{'closing-side-comments'};
    $rOpts_closing_side_comment_else_flag =
      $rOpts->{'closing-side-comment-else-flag'};
    $rOpts_closing_side_comment_maximum_text =
      $rOpts->{'closing-side-comment-maximum-text'};
    $rOpts_comma_arrow_breakpoints  = $rOpts->{'comma-arrow-breakpoints'};
    $rOpts_continuation_indentation = $rOpts->{'continuation-indentation'};
    $rOpts_cuddled_paren_brace      = $rOpts->{'cuddled-paren-brace'};
    $rOpts_delete_closing_side_comments =
      $rOpts->{'delete-closing-side-comments'};
    $rOpts_delete_old_whitespace = $rOpts->{'delete-old-whitespace'};
    $rOpts_extended_continuation_indentation =
      $rOpts->{'extended-continuation-indentation'};
    $rOpts_delete_side_comments   = $rOpts->{'delete-side-comments'};
    $rOpts_delete_trailing_commas = $rOpts->{'delete-trailing-commas'};
    $rOpts_delete_weld_interfering_commas =
      $rOpts->{'delete-weld-interfering-commas'};
    $rOpts_format_skipping   = $rOpts->{'format-skipping'};
    $rOpts_freeze_whitespace = $rOpts->{'freeze-whitespace'};
    $rOpts_function_paren_vertical_alignment =
      $rOpts->{'function-paren-vertical-alignment'};
    $rOpts_fuzzy_line_length      = $rOpts->{'fuzzy-line-length'};
    $rOpts_ignore_old_breakpoints = $rOpts->{'ignore-old-breakpoints'};
    $rOpts_ignore_side_comment_lengths =
      $rOpts->{'ignore-side-comment-lengths'};
    $rOpts_ignore_perlcritic_comments = $rOpts->{'ignore-perlcritic-comments'};
    $rOpts_indent_closing_brace       = $rOpts->{'indent-closing-brace'};
    $rOpts_indent_columns             = $rOpts->{'indent-columns'};
    $rOpts_indent_only                = $rOpts->{'indent-only'};
    $rOpts_keep_interior_semicolons   = $rOpts->{'keep-interior-semicolons'};
    $rOpts_line_up_parentheses        = $rOpts->{'line-up-parentheses'};
    $rOpts_extended_block_tightness   = $rOpts->{'extended-block-tightness'};
    $rOpts_extended_line_up_parentheses =
      $rOpts->{'extended-line-up-parentheses'};
    $rOpts_logical_padding = $rOpts->{'logical-padding'};
    $rOpts_maximum_consecutive_blank_lines =
      $rOpts->{'maximum-consecutive-blank-lines'};
    $rOpts_maximum_fields_per_table  = $rOpts->{'maximum-fields-per-table'};
    $rOpts_maximum_line_length       = $rOpts->{'maximum-line-length'};
    $rOpts_one_line_block_semicolons = $rOpts->{'one-line-block-semicolons'};
    $rOpts_opening_brace_always_on_right =
      $rOpts->{'opening-brace-always-on-right'};
    $rOpts_outdent_keywords      = $rOpts->{'outdent-keywords'};
    $rOpts_outdent_labels        = $rOpts->{'outdent-labels'};
    $rOpts_outdent_long_comments = $rOpts->{'outdent-long-comments'};
    $rOpts_outdent_long_quotes   = $rOpts->{'outdent-long-quotes'};
    $rOpts_outdent_static_block_comments =
      $rOpts->{'outdent-static-block-comments'};
    $rOpts_recombine = $rOpts->{'recombine'};
    $rOpts_short_concatenation_item_length =
      $rOpts->{'short-concatenation-item-length'};
    $rOpts_space_prototype_paren     = $rOpts->{'space-prototype-paren'};
    $rOpts_stack_closing_block_brace = $rOpts->{'stack-closing-block-brace'};
    $rOpts_static_block_comments     = $rOpts->{'static-block-comments'};
    $rOpts_add_missing_else          = $rOpts->{'add-missing-else'};
    $rOpts_warn_missing_else         = $rOpts->{'warn-missing-else'};
    $rOpts_tee_block_comments        = $rOpts->{'tee-block-comments'};
    $rOpts_tee_pod                   = $rOpts->{'tee-pod'};
    $rOpts_tee_side_comments         = $rOpts->{'tee-side-comments'};
    $rOpts_valign_code               = $rOpts->{'valign-code'};
    $rOpts_valign_side_comments      = $rOpts->{'valign-side-comments'};
    $rOpts_valign_if_unless          = $rOpts->{'valign-if-unless'};
    $rOpts_variable_maximum_line_length =
      $rOpts->{'variable-maximum-line-length'};

    # Note that both opening and closing tokens can access the opening
    # and closing flags of their container types.
    %opening_vertical_tightness = (
        '(' => $rOpts->{'paren-vertical-tightness'},
        '{' => $rOpts->{'brace-vertical-tightness'},
        '[' => $rOpts->{'square-bracket-vertical-tightness'},
        ')' => $rOpts->{'paren-vertical-tightness'},
        '}' => $rOpts->{'brace-vertical-tightness'},
        ']' => $rOpts->{'square-bracket-vertical-tightness'},
    );

    %closing_vertical_tightness = (
        '(' => $rOpts->{'paren-vertical-tightness-closing'},
        '{' => $rOpts->{'brace-vertical-tightness-closing'},
        '[' => $rOpts->{'square-bracket-vertical-tightness-closing'},
        ')' => $rOpts->{'paren-vertical-tightness-closing'},
        '}' => $rOpts->{'brace-vertical-tightness-closing'},
        ']' => $rOpts->{'square-bracket-vertical-tightness-closing'},
    );

    # assume flag for '>' same as ')' for closing qw quotes
    %closing_token_indentation = (
        ')' => $rOpts->{'closing-paren-indentation'},
        '}' => $rOpts->{'closing-brace-indentation'},
        ']' => $rOpts->{'closing-square-bracket-indentation'},
        '>' => $rOpts->{'closing-paren-indentation'},
    );

    # flag indicating if any closing tokens are indented
    $some_closing_token_indentation =
         $rOpts->{'closing-paren-indentation'}
      || $rOpts->{'closing-brace-indentation'}
      || $rOpts->{'closing-square-bracket-indentation'}
      || $rOpts->{'indent-closing-brace'};

    %opening_token_right = (
        '(' => $rOpts->{'opening-paren-right'},
        '{' => $rOpts->{'opening-hash-brace-right'},
        '[' => $rOpts->{'opening-square-bracket-right'},
    );

    %stack_opening_token = (
        '(' => $rOpts->{'stack-opening-paren'},
        '{' => $rOpts->{'stack-opening-hash-brace'},
        '[' => $rOpts->{'stack-opening-square-bracket'},
    );

    %stack_closing_token = (
        ')' => $rOpts->{'stack-closing-paren'},
        '}' => $rOpts->{'stack-closing-hash-brace'},
        ']' => $rOpts->{'stack-closing-square-bracket'},
    );
    return;
} ## end sub initialize_global_option_vars

sub initialize_line_length_vars {

    # Create a table of maximum line length vs level for later efficient use.
    # We will make the tables very long to be sure it will not be exceeded.
    # But we have to choose a fixed length.  A check will be made at the start
    # of sub 'finish_formatting' to be sure it is not exceeded.  Note, some of
    # my standard test problems have indentation levels of about 150, so this
    # should be fairly large.  If the choice of a maximum level ever becomes
    # an issue then these table values could be returned in a sub with a simple
    # memoization scheme.

    # Also create a table of the maximum spaces available for text due to the
    # level only.  If a line has continuation indentation, then that space must
    # be subtracted from the table value.  This table is used for preliminary
    # estimates in welding, extended_ci, BBX, and marking short blocks.
    use constant LEVEL_TABLE_MAX => 1000;

    # The basic scheme:
    foreach my $level ( 0 .. LEVEL_TABLE_MAX ) {
        my $indent = $level * $rOpts_indent_columns;
        $maximum_line_length_at_level[$level] = $rOpts_maximum_line_length;
        $maximum_text_length_at_level[$level] =
          $rOpts_maximum_line_length - $indent;
    }

    # Correct the maximum_text_length table if the -wc=n flag is used
    $rOpts_whitespace_cycle = $rOpts->{'whitespace-cycle'};
    if ($rOpts_whitespace_cycle) {
        if ( $rOpts_whitespace_cycle > 0 ) {
            foreach my $level ( 0 .. LEVEL_TABLE_MAX ) {
                my $level_mod = $level % $rOpts_whitespace_cycle;
                my $indent    = $level_mod * $rOpts_indent_columns;
                $maximum_text_length_at_level[$level] =
                  $rOpts_maximum_line_length - $indent;
            }
        }
        else {
            $rOpts_whitespace_cycle = $rOpts->{'whitespace-cycle'} = 0;
        }
    }

    # Correct the tables if the -vmll flag is used.  These values override the
    # previous values.
    if ($rOpts_variable_maximum_line_length) {
        foreach my $level ( 0 .. LEVEL_TABLE_MAX ) {
            $maximum_text_length_at_level[$level] = $rOpts_maximum_line_length;
            $maximum_line_length_at_level[$level] =
              $rOpts_maximum_line_length + $level * $rOpts_indent_columns;
        }
    }

    # Define two measures of indentation level, alpha and beta, at which some
    # formatting features come under stress and need to start shutting down.
    # Some combination of the two will be used to shut down different
    # formatting features.
    # Put a reasonable upper limit on stress level (say 100) in case the
    # whitespace-cycle variable is used.
    my $stress_level_limit = min( 100, LEVEL_TABLE_MAX );

    # Find stress_level_alpha, targeted at very short maximum line lengths.
    $stress_level_alpha = $stress_level_limit + 1;
    foreach my $level_test ( 0 .. $stress_level_limit ) {
        my $max_len = $maximum_text_length_at_level[ $level_test + 1 ];
        my $excess_inside_space =
          $max_len -
          $rOpts_continuation_indentation -
          $rOpts_indent_columns - 8;
        if ( $excess_inside_space <= 0 ) {
            $stress_level_alpha = $level_test;
            last;
        }
    }

    # Find stress level beta, a stress level targeted at formatting
    # at deep levels near the maximum line length.  We start increasing
    # from zero and stop at the first level which shows no more space.

    # 'const' is a fixed number of spaces for a typical variable.
    # Cases b1197-b1204 work ok with const=12 but not with const=8
    my $const = 16;
    my $denom = max( 1, $rOpts_indent_columns );
    $stress_level_beta = 0;
    foreach my $level ( 0 .. $stress_level_limit ) {
        my $remaining_cycles = max(
            0,
            (
                $maximum_text_length_at_level[$level] -
                  $rOpts_continuation_indentation - $const
            ) / $denom
        );
        last if ( $remaining_cycles <= 3 );    # 2 does not work
        $stress_level_beta = $level;
    }

    # This is a combined level which works well for turning off formatting
    # features in most cases:
    $high_stress_level = min( $stress_level_alpha, $stress_level_beta + 2 );

    return;
} ## end sub initialize_line_length_vars

sub initialize_trailing_comma_rules {

    # Setup control hash for trailing commas

    # -wtc=s defines desired trailing comma policy:
    #
    #  =" "  stable
    #        [ both -atc  and -dtc ignored ]
    #  =0 : none
    #        [requires -dtc; -atc ignored]
    #  =1 or * : all
    #        [requires -atc; -dtc ignored]
    #  =m : multiline lists require trailing comma
    #        if -atc set => will add missing multiline trailing commas
    #        if -dtc set => will delete trailing single line commas
    #  =b or 'bare' (multiline) lists require trailing comma
    #        if -atc set => will add missing bare trailing commas
    #        if -dtc set => will delete non-bare trailing commas
    #  =h or 'hash': single column stable bare lists require trailing comma
    #        if -atc set will add these
    #        if -dtc set will delete other trailing commas

    #-------------------------------------------------------------------
    # This routine must be called after the alpha and beta stress levels
    # have been defined in sub 'initialize_line_length_vars'.
    #-------------------------------------------------------------------

    %trailing_comma_rules = ();

    my $rvalid_flags = [qw(0 1 * m b h i)];

    my $option = $rOpts->{'want-trailing-commas'};

    if ($option) {
        $option =~ s/^\s+//;
        $option =~ s/\s+$//;
    }

    # We need to use length() here because '0' is a possible option
    if ( defined($option) && length($option) ) {
        my $error_message;
        my %rule_hash;
        my @q = @{$rvalid_flags};
        my %is_valid_flag;
        @is_valid_flag{@q} = (1) x scalar(@q);

        # handle single character control, such as -wtc='b'
        if ( length($option) == 1 ) {
            foreach (qw< ) ] } >) {
                $rule_hash{$_} = [ $option, EMPTY_STRING ];
            }
        }

        # handle multi-character control(s), such as -wtc='[m' or -wtc='k(m'
        else {
            my @parts = split /\s+/, $option;
            foreach my $part (@parts) {
                if ( length($part) >= 2 && length($part) <= 3 ) {
                    my $val   = substr( $part, -1, 1 );
                    my $key_o = substr( $part, -2, 1 );
                    if ( $is_opening_token{$key_o} ) {
                        my $paren_flag = EMPTY_STRING;
                        if ( length($part) == 3 ) {
                            $paren_flag = substr( $part, 0, 1 );
                        }
                        my $key = $matching_token{$key_o};
                        $rule_hash{$key} = [ $val, $paren_flag ];
                    }
                    else {
                        $error_message .= "Unrecognized term: '$part'\n";
                    }
                }
                else {
                    $error_message .= "Unrecognized term: '$part'\n";
                }
            }
        }

        # check for valid control characters
        if ( !$error_message ) {
            foreach my $key ( keys %rule_hash ) {
                my $item = $rule_hash{$key};
                my ( $val, $paren_flag ) = @{$item};
                if ( $val && !$is_valid_flag{$val} ) {
                    my $valid_str = join( SPACE, @{$rvalid_flags} );
                    $error_message .=
                      "Unexpected value '$val'; must be one of: $valid_str\n";
                    last;
                }
                if ($paren_flag) {
                    if ( $paren_flag !~ /^[kKfFwW]$/ ) {
                        $error_message .=
"Unexpected paren flag '$paren_flag'; must be one of: k K f F w W\n";
                        last;
                    }
                    if ( $key ne ')' ) {
                        $error_message .=
"paren flag '$paren_flag' is only allowed before a '('\n";
                        last;
                    }
                }
            }
        }

        if ($error_message) {
            Warn(<<EOM);
Error parsing --want-trailing-commas='$option':
$error_message
EOM
        }

        # Set the control hash if no errors
        else {
            %trailing_comma_rules = %rule_hash;
        }
    }

    # Both adding and deleting commas can lead to instability in extreme cases
    if ( $rOpts_add_trailing_commas && $rOpts_delete_trailing_commas ) {

        # If the possible instability is significant, then we can turn off
        # -dtc as a defensive measure to prevent it.

        # We must turn off -dtc for very small values of --whitespace-cycle
        # to avoid instability.  A minimum value of -wc=3 fixes b1393, but a
        # value of 4 is used here for safety.  This parameter is seldom used,
        # and much larger than this when used, so the cutoff value is not
        # critical.
        if ( $rOpts_whitespace_cycle && $rOpts_whitespace_cycle <= 4 ) {
            $rOpts_delete_trailing_commas = 0;
        }
    }

    return;
} ## end sub initialize_trailing_comma_rules

sub initialize_whitespace_hashes {

    # This is called once before formatting begins to initialize these global
    # hashes, which control the use of whitespace around tokens:
    #
    # %binary_ws_rules
    # %want_left_space
    # %want_right_space
    # %space_after_keyword
    #
    # Many token types are identical to the tokens themselves.
    # See the tokenizer for a complete list. Here are some special types:
    #   k = perl keyword
    #   f = semicolon in for statement
    #   m = unary minus
    #   p = unary plus
    # Note that :: is excluded since it should be contained in an identifier
    # Note that '->' is excluded because it never gets space
    # parentheses and brackets are excluded since they are handled specially
    # curly braces are included but may be overridden by logic, such as
    # newline logic.

    # NEW_TOKENS: create a whitespace rule here.  This can be as
    # simple as adding your new letter to @spaces_both_sides, for
    # example.

    # fix for c250: added space rules new package type 'P' and sub type 'S'
    my @spaces_both_sides = qw#
      + - * / % ? = . : x < > | & ^ .. << >> ** && .. || // => += -=
      .= %= x= &= |= ^= *= <> <= >= == =~ !~ /= != ... <<= >>= ~~ !~~
      &&= ||= //= <=> A k f w F n C Y U G v P S
      #;

    my @spaces_left_side = qw<
      t ! ~ m p { \ h pp mm Z j
    >;
    push( @spaces_left_side, '#' );    # avoids warning message

    my @spaces_right_side = qw<
      ; } ) ] R J ++ -- **=
    >;
    push( @spaces_right_side, ',' );    # avoids warning message

    %want_left_space  = ();
    %want_right_space = ();
    %binary_ws_rules  = ();

    # Note that we setting defaults here.  Later in processing
    # the values of %want_left_space and  %want_right_space
    # may be overridden by any user settings specified by the
    # -wls and -wrs parameters.  However the binary_whitespace_rules
    # are hardwired and have priority.
    @want_left_space{@spaces_both_sides} =
      (1) x scalar(@spaces_both_sides);
    @want_right_space{@spaces_both_sides} =
      (1) x scalar(@spaces_both_sides);
    @want_left_space{@spaces_left_side} =
      (1) x scalar(@spaces_left_side);
    @want_right_space{@spaces_left_side} =
      (-1) x scalar(@spaces_left_side);
    @want_left_space{@spaces_right_side} =
      (-1) x scalar(@spaces_right_side);
    @want_right_space{@spaces_right_side} =
      (1) x scalar(@spaces_right_side);
    $want_left_space{'->'}      = WS_NO;
    $want_right_space{'->'}     = WS_NO;
    $want_left_space{'**'}      = WS_NO;
    $want_right_space{'**'}     = WS_NO;
    $want_right_space{'CORE::'} = WS_NO;

    # These binary_ws_rules are hardwired and have priority over the above
    # settings.  It would be nice to allow adjustment by the user,
    # but it would be complicated to specify.
    #
    # hash type information must stay tightly bound
    # as in :  ${xxxx}
    $binary_ws_rules{'i'}{'L'} = WS_NO;
    $binary_ws_rules{'i'}{'{'} = WS_YES;
    $binary_ws_rules{'k'}{'{'} = WS_YES;
    $binary_ws_rules{'U'}{'{'} = WS_YES;
    $binary_ws_rules{'i'}{'['} = WS_NO;
    $binary_ws_rules{'R'}{'L'} = WS_NO;
    $binary_ws_rules{'R'}{'{'} = WS_NO;
    $binary_ws_rules{'t'}{'L'} = WS_NO;
    $binary_ws_rules{'t'}{'{'} = WS_NO;
    $binary_ws_rules{'t'}{'='} = WS_OPTIONAL;    # for signatures; fixes b1123
    $binary_ws_rules{'}'}{'L'} = WS_NO;
    $binary_ws_rules{'}'}{'{'} = WS_OPTIONAL;    # RT#129850; was WS_NO
    $binary_ws_rules{'$'}{'L'} = WS_NO;
    $binary_ws_rules{'$'}{'{'} = WS_NO;
    $binary_ws_rules{'@'}{'L'} = WS_NO;
    $binary_ws_rules{'@'}{'{'} = WS_NO;
    $binary_ws_rules{'='}{'L'} = WS_YES;
    $binary_ws_rules{'J'}{'J'} = WS_YES;

    # the following includes ') {'
    # as in :    if ( xxx ) { yyy }
    $binary_ws_rules{']'}{'L'} = WS_NO;
    $binary_ws_rules{']'}{'{'} = WS_NO;
    $binary_ws_rules{')'}{'{'} = WS_YES;
    $binary_ws_rules{')'}{'['} = WS_NO;
    $binary_ws_rules{']'}{'['} = WS_NO;
    $binary_ws_rules{']'}{'{'} = WS_NO;
    $binary_ws_rules{'}'}{'['} = WS_NO;
    $binary_ws_rules{'R'}{'['} = WS_NO;

    $binary_ws_rules{']'}{'++'} = WS_NO;
    $binary_ws_rules{']'}{'--'} = WS_NO;
    $binary_ws_rules{')'}{'++'} = WS_NO;
    $binary_ws_rules{')'}{'--'} = WS_NO;

    $binary_ws_rules{'R'}{'++'} = WS_NO;
    $binary_ws_rules{'R'}{'--'} = WS_NO;

    $binary_ws_rules{'i'}{'Q'} = WS_YES;
    $binary_ws_rules{'n'}{'('} = WS_YES;    # occurs in 'use package n ()'

    $binary_ws_rules{'i'}{'('} = WS_NO;

    $binary_ws_rules{'w'}{'('} = WS_NO;
    $binary_ws_rules{'w'}{'{'} = WS_YES;
    return;

} ## end sub initialize_whitespace_hashes

{ #<<< begin closure set_whitespace_flags

my %is_special_ws_type;
my %is_wCUG;
my %is_wi;

BEGIN {

    # The following hash is used to skip over needless if tests.
    # Be sure to update it when adding new checks in its block.
    my @q = qw(k w C m - Q);
    push @q, '#';
    @is_special_ws_type{@q} = (1) x scalar(@q);

    # These hashes replace slower regex tests
    @q = qw( w C U G );
    @is_wCUG{@q} = (1) x scalar(@q);

    @q = qw( w i );
    @is_wi{@q} = (1) x scalar(@q);
} ## end BEGIN

use constant DEBUG_WHITE => 0;

# Hashes to set spaces around container tokens according to their
# sequence numbers.  These are set as keywords are examined.
# They are controlled by the -kpit and -kpitl flags.
my %opening_container_inside_ws;
my %closing_container_inside_ws;

sub set_whitespace_flags {

    # This routine is called once per file to set whitespace flags for that
    # file.  This routine examines each pair of nonblank tokens and sets a flag
    # indicating if white space is needed.
    #
    # $rwhitespace_flags->[$j] is a flag indicating whether a white space
    # BEFORE token $j is needed, with the following values:
    #
    #             WS_NO      = -1 do not want a space BEFORE token $j
    #             WS_OPTIONAL=  0 optional space or $j is a whitespace
    #             WS_YES     =  1 want a space BEFORE token $j
    #

    my $self = shift;

    my $j_tight_closing_paren = -1;
    my $rLL                   = $self->[_rLL_];
    my $jmax                  = @{$rLL} - 1;

    %opening_container_inside_ws = ();
    %closing_container_inside_ws = ();

    my $rblock_type_of_seqno = $self->[_rblock_type_of_seqno_];

    my $rOpts_space_keyword_paren   = $rOpts->{'space-keyword-paren'};
    my $rOpts_space_backslash_quote = $rOpts->{'space-backslash-quote'};
    my $rOpts_space_function_paren  = $rOpts->{'space-function-paren'};

    my $rwhitespace_flags       = [];
    my $ris_function_call_paren = {};

    return $rwhitespace_flags if ( $jmax < 0 );

    my %is_for_foreach = ( 'for' => 1, 'foreach' => 1 );

    my $last_token = SPACE;
    my $last_type  = 'b';

    my $last_token_dbg = SPACE;
    my $last_type_dbg  = 'b';

    my $rtokh_last = [ @{ $rLL->[0] } ];
    $rtokh_last->[_TOKEN_]         = $last_token;
    $rtokh_last->[_TYPE_]          = $last_type;
    $rtokh_last->[_TYPE_SEQUENCE_] = EMPTY_STRING;
    $rtokh_last->[_LINE_INDEX_]    = 0;

    my $rtokh_last_last = $rtokh_last;

    # This will identify braces to be treated as blocks for the -xbt flag
    my %block_type_for_tightness;

    my ( $ws_1, $ws_2, $ws_3, $ws_4 );

    # main loop over all tokens to define the whitespace flags
    my $last_type_is_opening;
    my ( $token, $type );
    my $j = -1;
    foreach my $rtokh ( @{$rLL} ) {

        $j++;

        $type = $rtokh->[_TYPE_];
        if ( $type eq 'b' ) {
            $rwhitespace_flags->[$j] = WS_OPTIONAL;
            next;
        }

        $token = $rtokh->[_TOKEN_];

        my $ws;

        #---------------------------------------------------------------
        # Whitespace Rules Section 1:
        # Handle space on the inside of opening braces.
        #---------------------------------------------------------------

        #    /^[L\{\(\[]$/
        if ($last_type_is_opening) {

            $last_type_is_opening = 0;

            my $seqno           = $rtokh->[_TYPE_SEQUENCE_];
            my $block_type      = $rblock_type_of_seqno->{$seqno};
            my $last_seqno      = $rtokh_last->[_TYPE_SEQUENCE_];
            my $last_block_type = $rblock_type_of_seqno->{$last_seqno}
              || $block_type_for_tightness{$last_seqno};

            $j_tight_closing_paren = -1;

            # let us keep empty matched braces together: () {} []
            # except for BLOCKS
            if ( $token eq $matching_token{$last_token} ) {
                if ($block_type) {
                    $ws = WS_YES;
                }
                else {
                    $ws = WS_NO;
                }
            }
            else {

                # we're considering the right of an opening brace
                # tightness = 0 means always pad inside with space
                # tightness = 1 means pad inside if "complex"
                # tightness = 2 means never pad inside with space

                my $tightness;
                if ( $last_block_type && $last_token eq '{' ) {
                    $tightness = $rOpts_block_brace_tightness;
                }
                else { $tightness = $tightness{$last_token} }

                #=============================================================
                # Patch for test problem <<snippets/fabrice_bug.in>>
                # We must always avoid spaces around a bare word beginning
                # with ^ as in:
                #    my $before = ${^PREMATCH};
                # Because all of the following cause an error in perl:
                #    my $before = ${ ^PREMATCH };
                #    my $before = ${ ^PREMATCH};
                #    my $before = ${^PREMATCH };
                # So if brace tightness flag is -bt=0 we must temporarily reset
                # to bt=1.  Note that here we must set tightness=1 and not 2 so
                # that the closing space is also avoided
                # (via the $j_tight_closing_paren flag in coding)
                if ( $type eq 'w' && $token =~ /^\^/ ) { $tightness = 1 }

                #=============================================================

                if ( $tightness <= 0 ) {
                    $ws = WS_YES;
                }
                elsif ( $tightness > 1 ) {
                    $ws = WS_NO;
                }
                else {

                    # find the index of the closing token
                    my $j_closing =
                      $self->[_K_closing_container_]->{$last_seqno};

                    # If the closing token is less than five characters ahead
                    # we must take a closer look
                    if (   defined($j_closing)
                        && $j_closing - $j < 5
                        && $rLL->[$j_closing]->[_TYPE_SEQUENCE_] eq
                        $last_seqno )
                    {
                        $ws =
                          ws_in_container( $j, $j_closing, $rLL, $type, $token,
                            $last_token );
                        if ( $ws == WS_NO ) {
                            $j_tight_closing_paren = $j_closing;
                        }
                    }
                    else {
                        $ws = WS_YES;
                    }
                }
            }

            # check for special cases which override the above rules
            if ( %opening_container_inside_ws && $last_seqno ) {
                my $ws_override = $opening_container_inside_ws{$last_seqno};
                if ($ws_override) { $ws = $ws_override }
            }

            $ws_4 = $ws_3 = $ws_2 = $ws_1 = $ws
              if DEBUG_WHITE;

        } ## end setting space flag inside opening tokens

        #---------------------------------------------------------------
        # Whitespace Rules Section 2:
        # Special checks for certain types ...
        #---------------------------------------------------------------
        # The hash '%is_special_ws_type' significantly speeds up this routine,
        # but be sure to update it if a new check is added.
        # Currently has types: qw(k w C m - Q #)
        if ( $is_special_ws_type{$type} ) {

            if ( $type eq 'k' ) {

                # Keywords 'for', 'foreach' are special cases for -kpit since
                # the opening paren does not always immediately follow the
                # keyword. So we have to search forward for the paren in this
                # case.  I have limited the search to 10 tokens ahead, just in
                # case somebody has a big file and no opening paren.  This
                # should be enough for all normal code. Added the level check
                # to fix b1236.
                if (   $is_for_foreach{$token}
                    && %keyword_paren_inner_tightness
                    && defined( $keyword_paren_inner_tightness{$token} )
                    && $j < $jmax )
                {
                    my $level = $rLL->[$j]->[_LEVEL_];
                    my $jp    = $j;
                    ## NOTE: we might use the KNEXT variable to avoid this loop
                    ## but profiling shows that little would be saved
                    foreach my $inc ( 1 .. 9 ) {
                        $jp++;
                        last if ( $jp > $jmax );
                        last if ( $rLL->[$jp]->[_LEVEL_] != $level );    # b1236
                        next unless ( $rLL->[$jp]->[_TOKEN_] eq '(' );
                        my $seqno_p = $rLL->[$jp]->[_TYPE_SEQUENCE_];
                        set_container_ws_by_keyword( $token, $seqno_p );
                        last;
                    }
                }
            }

            # handle a comment
            elsif ( $type eq '#' ) {

                # newline before block comment ($j==0), and
                # space before side comment    ($j>0), so ..
                $ws = WS_YES;

                #---------------------------------
                # Nothing more to do for a comment
                #---------------------------------
                $rwhitespace_flags->[$j] = $ws;
                next;
            }

            # space_backslash_quote; RT #123774  <<snippets/rt123774.in>>
            # allow a space between a backslash and single or double quote
            # to avoid fooling html formatters
            elsif ( $type eq 'Q' ) {
                if ( $last_type eq '\\' && $token =~ /^[\"\']/ ) {
                    $ws =
                       !$rOpts_space_backslash_quote      ? WS_NO
                      : $rOpts_space_backslash_quote == 1 ? WS_OPTIONAL
                      : $rOpts_space_backslash_quote == 2 ? WS_YES
                      :                                     WS_YES;
                }
            }

            # retain any space between '-' and bare word
            elsif ( $type eq 'w' || $type eq 'C' ) {
                $ws = WS_OPTIONAL if $last_type eq '-';
            }

            # retain any space between '-' and bare word; for example
            # avoid space between 'USER' and '-' here: <<snippets/space2.in>>
            #   $myhash{USER-NAME}='steve';
            elsif ( $type eq 'm' || $type eq '-' ) {
                $ws = WS_OPTIONAL if ( $last_type eq 'w' );
            }

            else {
                # A type $type was entered in %is_special_ws_type but
                # there is no code block to handle it. Either remove it
                # from the hash or add a code block to handle it.
                DEVEL_MODE && Fault("no code to handle type $type\n");
            }
        } ## end elsif ( $is_special_ws_type{$type} ...

        #---------------------------------------------------------------
        # Whitespace Rules Section 3:
        # Handle space on inside of closing brace pairs.
        #---------------------------------------------------------------

        #   /[\}\)\]R]/
        elsif ( $is_closing_type{$type} ) {

            my $seqno = $rtokh->[_TYPE_SEQUENCE_];
            if ( $j == $j_tight_closing_paren ) {

                $j_tight_closing_paren = -1;
                $ws                    = WS_NO;
            }
            else {

                if ( !defined($ws) ) {

                    my $tightness;
                    my $block_type = $rblock_type_of_seqno->{$seqno}
                      || $block_type_for_tightness{$seqno};

                    if ( $block_type && $token eq '}' ) {
                        $tightness = $rOpts_block_brace_tightness;
                    }
                    else { $tightness = $tightness{$token} }

                    $ws = ( $tightness > 1 ) ? WS_NO : WS_YES;
                }
            }

            # check for special cases which override the above rules
            if ( %closing_container_inside_ws && $seqno ) {
                my $ws_override = $closing_container_inside_ws{$seqno};
                if ($ws_override) { $ws = $ws_override }
            }

            $ws_4 = $ws_3 = $ws_2 = $ws
              if DEBUG_WHITE;
        } ## end setting space flag inside closing tokens

        #---------------------------------------------------------------
        # Whitespace Rules Section 4:
        #---------------------------------------------------------------
        #    /^[L\{\(\[]$/
        elsif ( $is_opening_type{$type} ) {

            $last_type_is_opening = 1;

            if ( $token eq '(' ) {

                my $seqno = $rtokh->[_TYPE_SEQUENCE_];

                # This will have to be tweaked as tokenization changes.
                # We usually want a space at '} (', for example:
                # <<snippets/space1.in>>
                #     map { 1 * $_; } ( $y, $M, $w, $d, $h, $m, $s );
                #
                # But not others:
                #     &{ $_->[1] }( delete $_[$#_]{ $_->[0] } );
                # At present, the above & block is marked as type L/R so this
                # case won't go through here.
                if ( $last_type eq '}' && $last_token ne ')' ) { $ws = WS_YES }

                # NOTE: some older versions of Perl had occasional problems if
                # spaces are introduced between keywords or functions and
                # opening parens.  So the default is not to do this except is
                # certain cases.  The current Perl seems to tolerate spaces.

                # Space between keyword and '('
                elsif ( $last_type eq 'k' ) {
                    $ws = WS_NO
                      unless ( $rOpts_space_keyword_paren
                        || $space_after_keyword{$last_token} );

                    # Set inside space flag if requested
                    set_container_ws_by_keyword( $last_token, $seqno );
                }

                # Space between function and '('
                # -----------------------------------------------------
                # 'w' and 'i' checks for something like:
                #   myfun(    &myfun(   ->myfun(
                # -----------------------------------------------------

                # Note that at this point an identifier may still have a
                # leading arrow, but the arrow will be split off during token
                # respacing.  After that, the token may become a bare word
                # without leading arrow.  The point is, it is best to mark
                # function call parens right here before that happens.
                # Patch: added 'C' to prevent blinker, case b934, i.e. 'pi()'
                # NOTE: this would be the place to allow spaces between
                # repeated parens, like () () (), as in case c017, but I
                # decided that would not be a good idea.

                # Updated to allow detached '->' from tokenizer (issue c140)
                elsif (

                    #        /^[wCUG]$/
                    $is_wCUG{$last_type}

                    || (

                        #      /^[wi]$/
                        $is_wi{$last_type}

                        && (

                            # with prefix '->' or '&'
                            $last_token =~ /^([\&]|->)/

                            # or preceding token '->' (see b1337; c140)
                            || $rtokh_last_last->[_TYPE_] eq '->'

                            # or preceding sub call operator token '&'
                            || (   $rtokh_last_last->[_TYPE_] eq 't'
                                && $rtokh_last_last->[_TOKEN_] =~ /^\&\s*$/ )
                        )
                    )
                  )
                {
                    $ws =
                        $rOpts_space_function_paren
                      ? $self->ws_space_function_paren( $j, $rtokh_last_last )
                      : WS_NO;

                    set_container_ws_by_keyword( $last_token, $seqno );
                    $ris_function_call_paren->{$seqno} = 1;
                }

                # space between something like $i and ( in 'snippets/space2.in'
                # for $i ( 0 .. 20 ) {
                elsif ( $last_type eq 'i' && $last_token =~ /^[\$\%\@]/ ) {
                    $ws = WS_YES;
                }

                # allow constant function followed by '()' to retain no space
                elsif ($last_type eq 'C'
                    && $rLL->[ $j + 1 ]->[_TOKEN_] eq ')' )
                {
                    $ws = WS_NO;
                }
                else {
                    # ok - opening paren not covered by a special rule
                }
            }

            # patch for SWITCH/CASE: make space at ']{' optional
            # since the '{' might begin a case or when block
            elsif ( ( $token eq '{' && $type ne 'L' ) && $last_token eq ']' ) {
                $ws = WS_OPTIONAL;
            }
            else {
                # ok - opening type not covered by a special rule
            }

            # keep space between 'sub' and '{' for anonymous sub definition,
            # be sure type = 'k' (added for c140)
            if ( $type eq '{' ) {
                if ( $last_token eq 'sub' && $last_type eq 'k' ) {
                    $ws = WS_YES;
                }

                # this is needed to avoid no space in '){'
                if ( $last_token eq ')' && $token eq '{' ) { $ws = WS_YES }

                # avoid any space before the brace or bracket in something like
                #  @opts{'a','b',...}
                if ( $last_type eq 'i' && $last_token =~ /^\@/ ) {
                    $ws = WS_NO;
                }
            }

            # The --extended-block-tightness option allows certain braces
            # to be treated as blocks just for setting inner whitespace
            if ( $rOpts_extended_block_tightness && $token eq '{' ) {
                my $seqno = $rtokh->[_TYPE_SEQUENCE_];
                if (  !$rblock_type_of_seqno->{$seqno}
                    && $extended_block_tightness_list{$last_token} )
                {

                    # Ok - make this brace a block type for tightness only
                    $block_type_for_tightness{$seqno} = $last_token;
                }
            }
        } ## end elsif ( $is_opening_type{$type} ) {

        else {
            # ok: $type not opening, closing, or covered by a special rule
        }

        # always preserve whatever space was used after a possible
        # filehandle (except _) or here doc operator
        if (
            (
                ( $last_type eq 'Z' && $last_token ne '_' )
                || $last_type eq 'h'
            )
            && $type ne '#' # no longer required due to early exit for '#' above
          )
        {
            # no space for '$ {' even if '$' is marked as type 'Z', issue c221
            if ( $last_type eq 'Z' && $last_token eq '$' && $token eq '{' ) {
                $ws = WS_NO;
            }
            else {
                $ws = WS_OPTIONAL;
            }
        }

        $ws_4 = $ws_3 = $ws
          if DEBUG_WHITE;

        if ( !defined($ws) ) {

            #---------------------------------------------------------------
            # Whitespace Rules Section 4:
            # Use the binary rule table.
            #---------------------------------------------------------------
            if ( defined( $binary_ws_rules{$last_type}{$type} ) ) {
                $ws   = $binary_ws_rules{$last_type}{$type};
                $ws_4 = $ws if DEBUG_WHITE;
            }

            #---------------------------------------------------------------
            # Whitespace Rules Section 5:
            # Apply default rules not covered above.
            #---------------------------------------------------------------

            # If we fall through to here, look at the pre-defined hash tables
            # for the two tokens, and:
            #  if (they are equal) use the common value
            #  if (either is zero or undef) use the other
            #  if (either is -1) use it
            # That is,
            # left  vs right
            #  1    vs    1     -->  1
            #  0    vs    0     -->  0
            # -1    vs   -1     --> -1
            #
            #  0    vs   -1     --> -1
            #  0    vs    1     -->  1
            #  1    vs    0     -->  1
            # -1    vs    0     --> -1
            #
            # -1    vs    1     --> -1
            #  1    vs   -1     --> -1
            else {
                my $wl = $want_left_space{$type};
                my $wr = $want_right_space{$last_type};
                if ( !defined($wl) ) {
                    $ws = defined($wr) ? $wr : 0;
                }
                elsif ( !defined($wr) ) {
                    $ws = $wl;
                }
                else {
                    $ws =
                      ( ( $wl == $wr ) || ( $wl == -1 ) || !$wr ) ? $wl : $wr;
                }
            }
        }

        # Treat newline as a whitespace. Otherwise, we might combine
        # 'Send' and '-recipients' here according to the above rules:
        # <<snippets/space3.in>>
        #    my $msg = new Fax::Send
        #      -recipients => $to,
        #      -data => $data;
        if (  !$ws
            && $rtokh->[_LINE_INDEX_] != $rtokh_last->[_LINE_INDEX_] )
        {
            $ws = WS_YES;
        }

        $rwhitespace_flags->[$j] = $ws;

        # remember non-blank, non-comment tokens
        $last_token      = $token;
        $last_type       = $type;
        $rtokh_last_last = $rtokh_last;
        $rtokh_last      = $rtokh;

        # Programming note: for some reason, it is very much faster to 'next'
        # out of this loop here than to put the DEBUG coding in a block.
        # But note that the debug code must then update its own copies
        # of $last_token and $last_type.
        next if ( !DEBUG_WHITE );

        my $str = substr( $last_token_dbg, 0, 15 );
        $str .= SPACE x ( 16 - length($str) );
        if ( !defined($ws_1) ) { $ws_1 = "*" }
        if ( !defined($ws_2) ) { $ws_2 = "*" }
        if ( !defined($ws_3) ) { $ws_3 = "*" }
        if ( !defined($ws_4) ) { $ws_4 = "*" }
        print {*STDOUT}
"NEW WHITE:  i=$j $str $last_type_dbg $type $ws_1 : $ws_2 : $ws_3 : $ws_4 : $ws \n";

        # reset for next pass
        $ws_1 = $ws_2 = $ws_3 = $ws_4 = undef;

        $last_token_dbg = $token;
        $last_type_dbg  = $type;

    } ## end main loop

    if ( $rOpts->{'tight-secret-operators'} ) {
        new_secret_operator_whitespace( $rLL, $rwhitespace_flags );
    }
    $self->[_ris_function_call_paren_] = $ris_function_call_paren;
    return $rwhitespace_flags;

} ## end sub set_whitespace_flags

sub set_container_ws_by_keyword {

    my ( $word, $sequence_number ) = @_;
    return unless (%keyword_paren_inner_tightness);

    # We just saw a keyword (or other function name) followed by an opening
    # paren. Now check to see if the following paren should have special
    # treatment for its inside space.  If so we set a hash value using the
    # sequence number as key.
    if ( $word && $sequence_number ) {
        my $tightness = $keyword_paren_inner_tightness{$word};
        if ( defined($tightness) && $tightness != 1 ) {
            my $ws_flag = $tightness == 0 ? WS_YES : WS_NO;
            $opening_container_inside_ws{$sequence_number} = $ws_flag;
            $closing_container_inside_ws{$sequence_number} = $ws_flag;
        }
    }
    return;
} ## end sub set_container_ws_by_keyword

sub ws_in_container {

    my ( $j, $j_closing, $rLL, $type, $token, $last_token ) = @_;

    # Given:
    #  $j = index of token following an opening container token
    #  $type, $token = the type and token at index $j
    #  $j_closing = closing token of the container
    #  $last_token = the opening token of the container
    # Return:
    #  WS_NO  if there is just one token in the container (with exceptions)
    #  WS_YES otherwise

    #------------------------------------
    # Look forward for the closing token;
    #------------------------------------
    if ( $j + 1 > $j_closing ) { return WS_NO }

    # Patch to count '-foo' as single token so that
    # each of  $a{-foo} and $a{foo} and $a{'foo'} do
    # not get spaces with default formatting.
    my $j_here = $j;
    ++$j_here
      if ( $token eq '-'
        && $last_token eq '{'
        && $rLL->[ $j + 1 ]->[_TYPE_] eq 'w' );

    # Patch to count a sign separated from a number as a single token, as
    # in the following line. Otherwise, it takes two steps to converge:
    #    deg2rad(-  0.5)
    if (   ( $type eq 'm' || $type eq 'p' )
        && $j < $j_closing + 1
        && $rLL->[ $j + 1 ]->[_TYPE_] eq 'b'
        && $rLL->[ $j + 2 ]->[_TYPE_] eq 'n'
        && $rLL->[ $j + 2 ]->[_TOKEN_] =~ /^\d/ )
    {
        $j_here = $j + 2;
    }

    # $j_next is where a closing token should be if the container has
    # just a "single" token
    if ( $j_here + 1 > $j_closing ) { return WS_NO }
    my $j_next =
      ( $rLL->[ $j_here + 1 ]->[_TYPE_] eq 'b' )
      ? $j_here + 2
      : $j_here + 1;

    #-----------------------------------------------------------------
    # Now decide: if we get to the closing token we will keep it tight
    #-----------------------------------------------------------------
    if (
        $j_next == $j_closing

        # OLD PROBLEM: but watch out for this: [ [ ]    (misc.t)
        # No longer necessary because of the previous check on sequence numbers
        ##&& $last_token ne $token

        # double diamond is usually spaced
        && $token ne '<<>>'

      )
    {
        return WS_NO;
    }

    return WS_YES;

} ## end sub ws_in_container

sub ws_space_function_paren {

    my ( $self, $j, $rtokh_last_last ) = @_;

    # Called if --space-function-paren is set to see if it might cause
    # a problem.  The manual warns the user about potential problems with
    # this flag. Here we just try to catch one common problem.

    # Given:
    #  $j = index of '(' after function name
    # Return:
    #  WS_NO  if no space
    #  WS_YES otherwise

    # This was added to fix for issue c166. Ignore -sfp at a possible indirect
    # object location. For example, do not convert this:
    #   print header() ...
    # to this:
    #   print header () ...
    # because in this latter form, header may be taken to be a file handle
    # instead of a function call.

    # Start with the normal value for -sfp:
    my $ws = WS_YES;

    # now check to be sure we don't cause a problem:
    my $type_ll = $rtokh_last_last->[_TYPE_];
    my $tok_ll  = $rtokh_last_last->[_TOKEN_];

    # NOTE: this is just a minimal check. For example, we might also check
    # for something like this:
    #   print ( header ( ..
    if ( $type_ll eq 'k' && $is_indirect_object_taker{$tok_ll} ) {
        $ws = WS_NO;
    }

    return $ws;

} ## end sub ws_space_function_paren

} ## end closure set_whitespace_flags

sub dump_want_left_space {
    my $fh = shift;
    local $LIST_SEPARATOR = "\n";
    $fh->print(<<EOM);
These values are the main control of whitespace to the left of a token type;
They may be altered with the -wls parameter.
For a list of token types, use perltidy --dump-token-types (-dtt)
 1 means the token wants a space to its left
-1 means the token does not want a space to its left
------------------------------------------------------------------------
EOM
    foreach my $key ( sort keys %want_left_space ) {
        $fh->print("$key\t$want_left_space{$key}\n");
    }
    return;
} ## end sub dump_want_left_space

sub dump_want_right_space {
    my $fh = shift;
    local $LIST_SEPARATOR = "\n";
    $fh->print(<<EOM);
These values are the main control of whitespace to the right of a token type;
They may be altered with the -wrs parameter.
For a list of token types, use perltidy --dump-token-types (-dtt)
 1 means the token wants a space to its right
-1 means the token does not want a space to its right
------------------------------------------------------------------------
EOM
    foreach my $key ( sort keys %want_right_space ) {
        $fh->print("$key\t$want_right_space{$key}\n");
    }
    return;
} ## end sub dump_want_right_space

{    ## begin closure is_essential_whitespace

    my %is_sort_grep_map;
    my %is_for_foreach;
    my %is_digraph;
    my %is_trigraph;
    my %essential_whitespace_filter_l1;
    my %essential_whitespace_filter_r1;
    my %essential_whitespace_filter_l2;
    my %essential_whitespace_filter_r2;
    my %is_type_with_space_before_bareword;
    my %is_special_variable_char;

    BEGIN {

        my @q;

        # NOTE: This hash is like the global %is_sort_map_grep, but it ignores
        # grep aliases on purpose, since here we are looking parens, not braces
        @q = qw(sort grep map);
        @is_sort_grep_map{@q} = (1) x scalar(@q);

        @q = qw(for foreach);
        @is_for_foreach{@q} = (1) x scalar(@q);

        @q = qw(
          .. :: << >> ** && || // -> => += -= .= %= &= |= ^= *= <>
          <= >= == =~ !~ != ++ -- /= x= ~~ ~. |. &. ^.
        );
        @is_digraph{@q} = (1) x scalar(@q);

        @q = qw( ... **= <<= >>= &&= ||= //= <=> !~~ &.= |.= ^.= <<~);
        @is_trigraph{@q} = (1) x scalar(@q);

        # These are used as a speedup filters for sub is_essential_whitespace.

        # Filter 1:
        # These left side token types USUALLY do not require a space:
        @q = qw( ; { } [ ] L R );
        push @q, ',';
        push @q, ')';
        push @q, '(';
        @essential_whitespace_filter_l1{@q} = (1) x scalar(@q);

        # BUT some might if followed by these right token types
        @q = qw( pp mm << <<= h );
        @essential_whitespace_filter_r1{@q} = (1) x scalar(@q);

        # Filter 2:
        # These right side filters usually do not require a space
        @q = qw( ; ] R } );
        push @q, ',';
        push @q, ')';
        @essential_whitespace_filter_r2{@q} = (1) x scalar(@q);

        # BUT some might if followed by these left token types
        @q = qw( h Z );
        @essential_whitespace_filter_l2{@q} = (1) x scalar(@q);

        # Keep a space between certain types and any bareword:
        # Q: keep a space between a quote and a bareword to prevent the
        #    bareword from becoming a quote modifier.
        # &: do not remove space between an '&' and a bare word because
        #    it may turn into a function evaluation, like here
        #    between '&' and 'O_ACCMODE', producing a syntax error [File.pm]
        #      $opts{rdonly} = (($opts{mode} & O_ACCMODE) == O_RDONLY);
        @q = qw( Q & );
        @is_type_with_space_before_bareword{@q} = (1) x scalar(@q);

        # These are the only characters which can (currently) form special
        # variables, like $^W: (issue c066, c068).
        @q =
          qw{ ? A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] ^ _ };
        @{is_special_variable_char}{@q} = (1) x scalar(@q);

    } ## end BEGIN

    sub is_essential_whitespace {

        # Essential whitespace means whitespace which cannot be safely deleted
        # without risking the introduction of a syntax error.
        # We are given three tokens and their types:
        # ($tokenl, $typel) is the token to the left of the space in question
        # ($tokenr, $typer) is the token to the right of the space in question
        # ($tokenll, $typell) is previous nonblank token to the left of $tokenl
        #
        # Note1: This routine should almost never need to be changed.  It is
        # for avoiding syntax problems rather than for formatting.

        # Note2: The -mangle option causes large numbers of calls to this
        # routine and therefore is a good test. So if a change is made, be sure
        # to use nytprof to profile with both old and revised coding using the
        # -mangle option and check differences.

        my ( $tokenll, $typell, $tokenl, $typel, $tokenr, $typer ) = @_;

        # This is potentially a very slow routine but the following quick
        # filters typically catch and handle over 90% of the calls.

        # Filter 1: usually no space required after common types ; , [ ] { } ( )
        return
          if ( $essential_whitespace_filter_l1{$typel}
            && !$essential_whitespace_filter_r1{$typer} );

        # Filter 2: usually no space before common types ; ,
        return
          if ( $essential_whitespace_filter_r2{$typer}
            && !$essential_whitespace_filter_l2{$typel} );

        # Filter 3: Handle side comments: a space is only essential if the left
        # token ends in '$' For example, we do not want to create $#foo below:

        #   sub t086
        #       ( #foo)))
        #       $ #foo)))
        #       a #foo)))
        #       ) #foo)))
        #       { ... }

        # Also, I prefer not to put a ? and # together because ? used to be
        # a pattern delimiter and spacing was used if guessing was needed.

        if ( $typer eq '#' ) {

            return 1
              if ( $tokenl
                && ( $typel eq '?' || substr( $tokenl, -1 ) eq '$' ) );
            return;
        }

        my $tokenr_is_bareword   = $tokenr =~ /^\w/ && $tokenr !~ /^\d/;
        my $tokenr_is_open_paren = $tokenr eq '(';
        my $token_joined         = $tokenl . $tokenr;
        my $tokenl_is_dash       = $tokenl eq '-';

        my $result =

          # never combine two bare words or numbers
          # examples:  and ::ok(1)
          #            return ::spw(...)
          #            for bla::bla:: abc
          # example is "%overload:: and" in files Dumpvalue.pm or colonbug.pl
          #            $input eq"quit" to make $inputeq"quit"
          #            my $size=-s::SINK if $file;  <==OK but we won't do it
          # don't join something like: for bla::bla:: abc
          # example is "%overload:: and" in files Dumpvalue.pm or colonbug.pl
          (      ( $tokenl =~ /([\'\w]|\:\:)$/ && $typel ne 'CORE::' )
              && ( $tokenr =~ /^([\'\w]|\:\:)/ ) )

          # do not combine a number with a concatenation dot
          # example: pom.caputo:
          # $vt100_compatible ? "\e[0;0H" : ('-' x 78 . "\n");
          || $typel eq 'n' && $tokenr eq '.'
          || $typer eq 'n' && $tokenl eq '.'

          # cases of a space before a bareword...
          || (
            $tokenr_is_bareword && (

                # do not join a minus with a bare word, because you might form
                # a file test operator.  Example from Complex.pm:
                # if (CORE::abs($z - i) < $eps);
                # "z-i" would be taken as a file test.
                $tokenl_is_dash && length($tokenr) == 1

                # and something like this could become ambiguous without space
                # after the '-':
                #   use constant III=>1;
                #   $a = $b - III;
                # and even this:
                #   $a = - III;
                || $tokenl_is_dash && $typer =~ /^[wC]$/

                # keep space between types Q & and a bareword
                || $is_type_with_space_before_bareword{$typel}

                # +-: binary plus and minus before a bareword could get
                # converted into unary plus and minus on next pass through the
                # tokenizer. This can lead to blinkers: cases b660 b670 b780
                # b781 b787 b788 b790 So we keep a space unless the +/- clearly
                # follows an operator
                || ( ( $typel eq '+' || $typel eq '-' )
                    && $typell !~ /^[niC\)\}\]R]$/ )

                # keep a space between a token ending in '$' and any word;
                # this caused trouble:  "die @$ if $@"
                || $typel eq 'i' && substr( $tokenl, -1, 1 ) eq '$'

                # don't combine $$ or $# with any alphanumeric
                # (testfile mangle.t with --mangle)
                || $tokenl eq '$$'
                || $tokenl eq '$#'

            )
          )    ## end $tokenr_is_bareword

          # OLD, not used
          # '= -' should not become =- or you will get a warning
          # about reversed -=
          # || ($tokenr eq '-')

          # do not join a bare word with a minus, like between 'Send' and
          # '-recipients' here <<snippets/space3.in>>
          #   my $msg = new Fax::Send
          #     -recipients => $to,
          #     -data => $data;
          # This is the safest thing to do. If we had the token to the right of
          # the minus we could do a better check.
          #
          # And do not combine a bareword and a quote, like this:
          #    oops "Your login, $Bad_Login, is not valid";
          # It can cause a syntax error if oops is a sub
          || $typel eq 'w' && ( $tokenr eq '-' || $typer eq 'Q' )

          # perl is very fussy about spaces before <<
          || substr( $tokenr, 0, 2 ) eq '<<'

          # avoid combining tokens to create new meanings. Example:
          #     $a+ +$b must not become $a++$b
          || ( $is_digraph{$token_joined} )
          || $is_trigraph{$token_joined}

          # another example: do not combine these two &'s:
          #     allow_options & &OPT_EXECCGI
          || $is_digraph{ $tokenl . substr( $tokenr, 0, 1 ) }

          # retain any space after possible filehandle
          # (testfiles prnterr1.t with --extrude and mangle.t with --mangle)
          # but no space for '$ {' even if '$' is marked as type 'Z', issue c221
          || ( $typel eq 'Z' && !( $tokenl eq '$' && $tokenr eq '{' ) )

          # Added 'Y' here 16 Jan 2021 to prevent -mangle option from removing
          # space after type Y. Otherwise, it will get parsed as type 'Z' later
          # and any space would have to be added back manually if desired.
          || $typel eq 'Y'

          # Perl is sensitive to whitespace after the + here:
          #  $b = xvals $a + 0.1 * yvals $a;
          || $typell eq 'Z' && $typel =~ /^[\/\?\+\-\*]$/

          || (
            $tokenr_is_open_paren && (

                # keep paren separate in 'use Foo::Bar ()'
                ( $typel eq 'w' && $typell eq 'k' && $tokenll eq 'use' )

                # OLD: keep any space between filehandle and paren:
                # file mangle.t with --mangle:
                # NEW: this test is no longer necessary here (moved above)
                ## || $typel eq 'Y'

                # must have space between grep and left paren; "grep(" will fail
                || $is_sort_grep_map{$tokenl}

                # don't stick numbers next to left parens, as in:
                #use Mail::Internet 1.28 (); (see Entity.pm, Head.pm, Test.pm)
                || $typel eq 'n'
            )
          )    ## end $tokenr_is_open_paren

          # retain any space after here doc operator ( hereerr.t)
          || $typel eq 'h'

          # be careful with a space around ++ and --, to avoid ambiguity as to
          # which token it applies
          || ( $typer eq 'pp' || $typer eq 'mm' ) && $tokenl !~ /^[\;\{\(\[]/
          || ( $typel eq '++' || $typel eq '--' )
          && $tokenr !~ /^[\;\}\)\]]/

          # need space after foreach my; for example, this will fail in
          # older versions of Perl:
          # foreach my$ft(@filetypes)...
          || (
            $tokenl eq 'my'

            && substr( $tokenr, 0, 1 ) eq '$'

            #  /^(for|foreach)$/
            && $is_for_foreach{$tokenll}
          )

          # Keep space after like $^ if needed to avoid forming a different
          # special variable (issue c068). For example:
          #       my $aa = $^ ? "none" : "ok";
          || ( $typel eq 'i'
            && length($tokenl) == 2
            && substr( $tokenl, 1, 1 ) eq '^'
            && $is_special_variable_char{ substr( $tokenr, 0, 1 ) } )

          # We must be sure that a space between a ? and a quoted string
          # remains if the space before the ? remains.  [Loca.pm, lockarea]
          # ie,
          #    $b=join $comma ? ',' : ':', @_;  # ok
          #    $b=join $comma?',' : ':', @_;    # ok!
          #    $b=join $comma ?',' : ':', @_;   # error!
          # Not really required:
          ## || ( ( $typel eq '?' ) && ( $typer eq 'Q' ) )

          # Space stacked labels...
          # Not really required: Perl seems to accept non-spaced labels.
          ## || $typel eq 'J' && $typer eq 'J'

          ;    # the value of this long logic sequence is the result we want
        return $result;
    } ## end sub is_essential_whitespace
} ## end closure is_essential_whitespace

{    ## begin closure new_secret_operator_whitespace

    my %secret_operators;
    my %is_leading_secret_token;

    BEGIN {

        # token lists for perl secret operators as compiled by Philippe Bruhat
        # at: https://metacpan.org/module/perlsecret
        %secret_operators = (
            'Goatse'             => [qw#= ( ) =#],        #=( )=
            'Venus1'             => [qw#0 +#],            # 0+
            'Venus2'             => [qw#+ 0#],            # +0
            'Enterprise'         => [qw#) x ! !#],        # ()x!!
            'Kite1'              => [qw#~ ~ <>#],         # ~~<>
            'Kite2'              => [qw#~~ <>#],          # ~~<>
            'Winking Fat Comma'  => [ ( ',', '=>' ) ],    # ,=>
            'Bang bang         ' => [qw#! !#],            # !!
        );

        # The following operators and constants are not included because they
        # are normally kept tight by perltidy:
        # ~~ <~>
        #

        # Make a lookup table indexed by the first token of each operator:
        # first token => [list, list, ...]
        foreach my $value ( values(%secret_operators) ) {
            my $tok = $value->[0];
            push @{ $is_leading_secret_token{$tok} }, $value;
        }
    } ## end BEGIN

    sub new_secret_operator_whitespace {

        my ( $rlong_array, $rwhitespace_flags ) = @_;

        # Loop over all tokens in this line
        my ( $token, $type );
        my $jmax = @{$rlong_array} - 1;
        foreach my $j ( 0 .. $jmax ) {

            $token = $rlong_array->[$j]->[_TOKEN_];
            $type  = $rlong_array->[$j]->[_TYPE_];

            # Skip unless this token might start a secret operator
            next if ( $type eq 'b' );
            next unless ( $is_leading_secret_token{$token} );

            #      Loop over all secret operators with this leading token
            foreach my $rpattern ( @{ $is_leading_secret_token{$token} } ) {
                my $jend = $j - 1;
                foreach my $tok ( @{$rpattern} ) {
                    $jend++;
                    $jend++

                      if ( $jend <= $jmax
                        && $rlong_array->[$jend]->[_TYPE_] eq 'b' );
                    if (   $jend > $jmax
                        || $tok ne $rlong_array->[$jend]->[_TOKEN_] )
                    {
                        $jend = undef;
                        last;
                    }
                }

                if ($jend) {

                    # set flags to prevent spaces within this operator
                    foreach my $jj ( $j + 1 .. $jend ) {
                        $rwhitespace_flags->[$jj] = WS_NO;
                    }
                    $j = $jend;
                    last;
                }
            }    ##      End Loop over all operators
        }    ## End loop over all tokens
        return;
    } ## end sub new_secret_operator_whitespace
} ## end closure new_secret_operator_whitespace

{    ## begin closure set_bond_strengths

    # These routines and variables are involved in deciding where to break very
    # long lines.

    # NEW_TOKENS must add bond strength rules

    my %is_good_keyword_breakpoint;
    my %is_container_token;

    my %binary_bond_strength_nospace;
    my %binary_bond_strength;
    my %nobreak_lhs;
    my %nobreak_rhs;

    my @bias_tokens;
    my %bias_hash;
    my %bias;
    my $delta_bias;

    sub initialize_bond_strength_hashes {

        my @q;
        @q = qw(if unless while until for foreach);
        @is_good_keyword_breakpoint{@q} = (1) x scalar(@q);

        @q = qw/ ( [ { } ] ) /;
        @is_container_token{@q} = (1) x scalar(@q);

        # The decision about where to break a line depends upon a "bond
        # strength" between tokens.  The LOWER the bond strength, the MORE
        # likely a break.  A bond strength may be any value but to simplify
        # things there are several pre-defined strength levels:

        #    NO_BREAK    => 10000;
        #    VERY_STRONG => 100;
        #    STRONG      => 2.1;
        #    NOMINAL     => 1.1;
        #    WEAK        => 0.8;
        #    VERY_WEAK   => 0.55;

        # The strength values are based on trial-and-error, and need to be
        # tweaked occasionally to get desired results.  Some comments:
        #
        #   1. Only relative strengths are important.  small differences
        #      in strengths can make big formatting differences.
        #   2. Each indentation level adds one unit of bond strength.
        #   3. A value of NO_BREAK makes an unbreakable bond
        #   4. A value of VERY_WEAK is the strength of a ','
        #   5. Values below NOMINAL are considered ok break points.
        #   6. Values above NOMINAL are considered poor break points.
        #
        # The bond strengths should roughly follow precedence order where
        # possible.  If you make changes, please check the results very
        # carefully on a variety of scripts.  Testing with the -extrude
        # options is particularly helpful in exercising all of the rules.

        # Wherever possible, bond strengths are defined in the following
        # tables.  There are two main stages to setting bond strengths and
        # two types of tables:
        #
        # The first stage involves looking at each token individually and
        # defining left and right bond strengths, according to if we want
        # to break to the left or right side, and how good a break point it
        # is.  For example tokens like =, ||, && make good break points and
        # will have low strengths, but one might want to break on either
        # side to put them at the end of one line or beginning of the next.
        #
        # The second stage involves looking at certain pairs of tokens and
        # defining a bond strength for that particular pair.  This second
        # stage has priority.

        #---------------------------------------------------------------
        # Bond Strength BEGIN Section 1.
        # Set left and right bond strengths of individual tokens.
        #---------------------------------------------------------------

        # NOTE: NO_BREAK's set in this section first are HINTS which will
        # probably not be honored. Essential NO_BREAKS's should be set in
        # BEGIN Section 2 or hardwired in the NO_BREAK coding near the end
        # of this subroutine.

        # Note that we are setting defaults in this section.  The user
        # cannot change bond strengths but can cause the left and right
        # bond strengths of any token type to be swapped through the use of
        # the -wba and -wbb flags. In this way the user can determine if a
        # breakpoint token should appear at the end of one line or the
        # beginning of the next line.

        %right_bond_strength          = ();
        %left_bond_strength           = ();
        %binary_bond_strength_nospace = ();
        %binary_bond_strength         = ();
        %nobreak_lhs                  = ();
        %nobreak_rhs                  = ();

        # The hash keys in this section are token types, plus the text of
        # certain keywords like 'or', 'and'.

        # no break around possible filehandle
        $left_bond_strength{'Z'}  = NO_BREAK;
        $right_bond_strength{'Z'} = NO_BREAK;

        # never put a bare word on a new line:
        # example print (STDERR, "bla"); will fail with break after (
        $left_bond_strength{'w'} = NO_BREAK;

        # blanks always have infinite strength to force breaks after
        # real tokens
        $right_bond_strength{'b'} = NO_BREAK;

        # try not to break on exponentiation
        @q                       = qw# ** .. ... <=> #;
        @left_bond_strength{@q}  = (STRONG) x scalar(@q);
        @right_bond_strength{@q} = (STRONG) x scalar(@q);

        # The comma-arrow has very low precedence but not a good break point
        $left_bond_strength{'=>'}  = NO_BREAK;
        $right_bond_strength{'=>'} = NOMINAL;

        # ok to break after label
        $left_bond_strength{'J'}  = NO_BREAK;
        $right_bond_strength{'J'} = NOMINAL;
        $left_bond_strength{'j'}  = STRONG;
        $right_bond_strength{'j'} = STRONG;
        $left_bond_strength{'A'}  = STRONG;
        $right_bond_strength{'A'} = STRONG;

        $left_bond_strength{'->'}  = STRONG;
        $right_bond_strength{'->'} = VERY_STRONG;

        $left_bond_strength{'CORE::'}  = NOMINAL;
        $right_bond_strength{'CORE::'} = NO_BREAK;

        # Fix for c250: added strengths for new type 'P'
        # Note: these are working okay, but may eventually need to be
        # adjusted or even removed.
        $left_bond_strength{'P'}  = NOMINAL;
        $right_bond_strength{'P'} = NOMINAL;

        # breaking AFTER modulus operator is ok:
        @q = qw< % >;
        @left_bond_strength{@q} = (STRONG) x scalar(@q);
        @right_bond_strength{@q} =
          ( 0.1 * NOMINAL + 0.9 * STRONG ) x scalar(@q);

        # Break AFTER math operators * and /
        @q                       = qw< * / x  >;
        @left_bond_strength{@q}  = (STRONG) x scalar(@q);
        @right_bond_strength{@q} = (NOMINAL) x scalar(@q);

        # Break AFTER weakest math operators + and -
        # Make them weaker than * but a bit stronger than '.'
        @q = qw< + - >;
        @left_bond_strength{@q} = (STRONG) x scalar(@q);
        @right_bond_strength{@q} =
          ( 0.91 * NOMINAL + 0.09 * WEAK ) x scalar(@q);

        # Define left strength of unary plus and minus (fixes case b511)
        $left_bond_strength{p} = $left_bond_strength{'+'};
        $left_bond_strength{m} = $left_bond_strength{'-'};

        # And make right strength of unary plus and minus very high.
        # Fixes cases b670 b790
        $right_bond_strength{p} = NO_BREAK;
        $right_bond_strength{m} = NO_BREAK;

        # breaking BEFORE these is just ok:
        @q                       = qw# >> << #;
        @right_bond_strength{@q} = (STRONG) x scalar(@q);
        @left_bond_strength{@q}  = (NOMINAL) x scalar(@q);

        # breaking before the string concatenation operator seems best
        # because it can be hard to see at the end of a line
        $right_bond_strength{'.'} = STRONG;
        $left_bond_strength{'.'}  = 0.9 * NOMINAL + 0.1 * WEAK;

        @q                       = qw< } ] ) R >;
        @left_bond_strength{@q}  = (STRONG) x scalar(@q);
        @right_bond_strength{@q} = (NOMINAL) x scalar(@q);

        # make these a little weaker than nominal so that they get
        # favored for end-of-line characters
        @q = qw< != == =~ !~ ~~ !~~ >;
        @left_bond_strength{@q} = (STRONG) x scalar(@q);
        @right_bond_strength{@q} =
          ( 0.9 * NOMINAL + 0.1 * WEAK ) x scalar(@q);

        # break AFTER these
        @q = qw# < >  | & >= <= #;
        @left_bond_strength{@q} = (VERY_STRONG) x scalar(@q);
        @right_bond_strength{@q} =
          ( 0.8 * NOMINAL + 0.2 * WEAK ) x scalar(@q);

        # breaking either before or after a quote is ok
        # but bias for breaking before a quote
        $left_bond_strength{'Q'}  = NOMINAL;
        $right_bond_strength{'Q'} = NOMINAL + 0.02;
        $left_bond_strength{'q'}  = NOMINAL;
        $right_bond_strength{'q'} = NOMINAL;

        # starting a line with a keyword is usually ok
        $left_bond_strength{'k'} = NOMINAL;

        # we usually want to bond a keyword strongly to what immediately
        # follows, rather than leaving it stranded at the end of a line
        $right_bond_strength{'k'} = STRONG;

        $left_bond_strength{'G'}  = NOMINAL;
        $right_bond_strength{'G'} = STRONG;

        # assignment operators
        @q = qw(
          = **= += *= &= <<= &&=
          -= /= |= >>= ||= //=
          .= %= ^=
          x=
        );

        # Default is to break AFTER various assignment operators
        @left_bond_strength{@q} = (STRONG) x scalar(@q);
        @right_bond_strength{@q} =
          ( 0.4 * WEAK + 0.6 * VERY_WEAK ) x scalar(@q);

        # Default is to break BEFORE '&&' and '||' and '//'
        # set strength of '||' to same as '=' so that chains like
        # $a = $b || $c || $d   will break before the first '||'
        $right_bond_strength{'||'} = NOMINAL;
        $left_bond_strength{'||'}  = $right_bond_strength{'='};

        # same thing for '//'
        $right_bond_strength{'//'} = NOMINAL;
        $left_bond_strength{'//'}  = $right_bond_strength{'='};

        # set strength of && a little higher than ||
        $right_bond_strength{'&&'} = NOMINAL;
        $left_bond_strength{'&&'}  = $left_bond_strength{'||'} + 0.1;

        $left_bond_strength{';'}  = VERY_STRONG;
        $right_bond_strength{';'} = VERY_WEAK;
        $left_bond_strength{'f'}  = VERY_STRONG;

        # make right strength of for ';' a little less than '='
        # to make for contents break after the ';' to avoid this:
        #   for ( $j = $number_of_fields - 1 ; $j < $item_count ; $j +=
        #     $number_of_fields )
        # and make it weaker than ',' and 'and' too
        $right_bond_strength{'f'} = VERY_WEAK - 0.03;

        # The strengths of ?/: should be somewhere between
        # an '=' and a quote (NOMINAL),
        # make strength of ':' slightly less than '?' to help
        # break long chains of ? : after the colons
        $left_bond_strength{':'}  = 0.4 * WEAK + 0.6 * NOMINAL;
        $right_bond_strength{':'} = NO_BREAK;
        $left_bond_strength{'?'}  = $left_bond_strength{':'} + 0.01;
        $right_bond_strength{'?'} = NO_BREAK;

        $left_bond_strength{','}  = VERY_STRONG;
        $right_bond_strength{','} = VERY_WEAK;

        # remaining digraphs and trigraphs not defined above
        @q                       = qw( :: <> ++ --);
        @left_bond_strength{@q}  = (WEAK) x scalar(@q);
        @right_bond_strength{@q} = (STRONG) x scalar(@q);

        # Set bond strengths of certain keywords
        # make 'or', 'err', 'and' slightly weaker than a ','
        $left_bond_strength{'and'} = VERY_WEAK - 0.01;
        $left_bond_strength{'or'}  = VERY_WEAK - 0.02;
        $left_bond_strength{'err'} = VERY_WEAK - 0.02;
        $left_bond_strength{'xor'} = VERY_WEAK - 0.01;

        @q = qw(ne eq);
        @left_bond_strength{@q} = (NOMINAL) x scalar(@q);

        @q = qw(lt gt le ge);
        @left_bond_strength{@q} = ( 0.9 * NOMINAL + 0.1 * STRONG ) x scalar(@q);

        @q = qw(and or err xor ne eq);
        @right_bond_strength{@q} = (NOMINAL) x scalar(@q);

        #---------------------------------------------------------------
        # Bond Strength BEGIN Section 2.
        # Set binary rules for bond strengths between certain token types.
        #---------------------------------------------------------------

        #  We have a little problem making tables which apply to the
        #  container tokens.  Here is a list of container tokens and
        #  their types:
        #
        #   type    tokens // meaning
        #      {    {, [, ( // indent
        #      }    }, ], ) // outdent
        #      [    [ // left non-structural [ (enclosing an array index)
        #      ]    ] // right non-structural square bracket
        #      (    ( // left non-structural paren
        #      )    ) // right non-structural paren
        #      L    { // left non-structural curly brace (enclosing a key)
        #      R    } // right non-structural curly brace
        #
        #  Some rules apply to token types and some to just the token
        #  itself.  We solve the problem by combining type and token into a
        #  new hash key for the container types.
        #
        #  If a rule applies to a token 'type' then we need to make rules
        #  for each of these 'type.token' combinations:
        #  Type    Type.Token
        #  {       {{, {[, {(
        #  [       [[
        #  (       ((
        #  L       L{
        #  }       }}, }], })
        #  ]       ]]
        #  )       ))
        #  R       R}
        #
        #  If a rule applies to a token then we need to make rules for
        #  these 'type.token' combinations:
        #  Token   Type.Token
        #  {       {{, L{
        #  [       {[, [[
        #  (       {(, ((
        #  }       }}, R}
        #  ]       }], ]]
        #  )       }), ))

        # allow long lines before final { in an if statement, as in:
        #    if (..........
        #      ..........)
        #    {
        #
        # Otherwise, the line before the { tends to be too short.

        $binary_bond_strength{'))'}{'{{'} = VERY_WEAK + 0.03;
        $binary_bond_strength{'(('}{'{{'} = NOMINAL;

        # break on something like '} (', but keep this stronger than a ','
        # example is in 'howe.pl'
        $binary_bond_strength{'R}'}{'(('} = 0.8 * VERY_WEAK + 0.2 * WEAK;
        $binary_bond_strength{'}}'}{'(('} = 0.8 * VERY_WEAK + 0.2 * WEAK;

        # keep matrix and hash indices together
        # but make them a little below STRONG to allow breaking open
        # something like {'some-word'}{'some-very-long-word'} at the }{
        # (bracebrk.t)
        $binary_bond_strength{']]'}{'[['} = 0.9 * STRONG + 0.1 * NOMINAL;
        $binary_bond_strength{']]'}{'L{'} = 0.9 * STRONG + 0.1 * NOMINAL;
        $binary_bond_strength{'R}'}{'[['} = 0.9 * STRONG + 0.1 * NOMINAL;
        $binary_bond_strength{'R}'}{'L{'} = 0.9 * STRONG + 0.1 * NOMINAL;

        # increase strength to the point where a break in the following
        # will be after the opening paren rather than at the arrow:
        #    $a->$b($c);
        $binary_bond_strength{'i'}{'->'} = 1.45 * STRONG;

        # Added for c140 to make 'w ->' and 'i ->' behave the same
        $binary_bond_strength{'w'}{'->'} = 1.45 * STRONG;

    # Note that the following alternative strength would make the break at the
    # '->' rather than opening the '('.  Both have advantages and disadvantages.
    # $binary_bond_strength{'i'}{'->'} = 0.5*STRONG + 0.5 * NOMINAL; #

        $binary_bond_strength{'))'}{'->'} = 0.1 * STRONG + 0.9 * NOMINAL;
        $binary_bond_strength{']]'}{'->'} = 0.1 * STRONG + 0.9 * NOMINAL;
        $binary_bond_strength{'})'}{'->'} = 0.1 * STRONG + 0.9 * NOMINAL;
        $binary_bond_strength{'}]'}{'->'} = 0.1 * STRONG + 0.9 * NOMINAL;
        $binary_bond_strength{'}}'}{'->'} = 0.1 * STRONG + 0.9 * NOMINAL;
        $binary_bond_strength{'R}'}{'->'} = 0.1 * STRONG + 0.9 * NOMINAL;

        $binary_bond_strength{'))'}{'[['} = 0.2 * STRONG + 0.8 * NOMINAL;
        $binary_bond_strength{'})'}{'[['} = 0.2 * STRONG + 0.8 * NOMINAL;
        $binary_bond_strength{'))'}{'{['} = 0.2 * STRONG + 0.8 * NOMINAL;
        $binary_bond_strength{'})'}{'{['} = 0.2 * STRONG + 0.8 * NOMINAL;

        #---------------------------------------------------------------
        # Binary NO_BREAK rules
        #---------------------------------------------------------------

        # use strict requires that bare word and => not be separated
        $binary_bond_strength{'C'}{'=>'} = NO_BREAK;
        $binary_bond_strength{'U'}{'=>'} = NO_BREAK;

        # Never break between a bareword and a following paren because
        # perl may give an error.  For example, if a break is placed
        # between 'to_filehandle' and its '(' the following line will
        # give a syntax error [Carp.pm]: my( $no) =fileno(
        # to_filehandle( $in)) ;
        $binary_bond_strength{'C'}{'(('} = NO_BREAK;
        $binary_bond_strength{'C'}{'{('} = NO_BREAK;
        $binary_bond_strength{'U'}{'(('} = NO_BREAK;
        $binary_bond_strength{'U'}{'{('} = NO_BREAK;

        # use strict requires that bare word within braces not start new
        # line
        $binary_bond_strength{'L{'}{'w'} = NO_BREAK;

        $binary_bond_strength{'w'}{'R}'} = NO_BREAK;

        # The following two rules prevent a syntax error caused by breaking up
        # a construction like '{-y}'.  The '-' quotes the 'y' and prevents
        # it from being taken as a transliteration. We have to keep
        # token types 'L m w' together to prevent this error.
        $binary_bond_strength{'L{'}{'m'}        = NO_BREAK;
        $binary_bond_strength_nospace{'m'}{'w'} = NO_BREAK;

        # keep 'bareword-' together, but only if there is no space between
        # the word and dash. Do not keep together if there is a space.
        # example 'use perl6-alpha'
        $binary_bond_strength_nospace{'w'}{'m'} = NO_BREAK;

        # use strict requires that bare word and => not be separated
        $binary_bond_strength{'w'}{'=>'} = NO_BREAK;

        # use strict does not allow separating type info from trailing { }
        # testfile is readmail.pl
        $binary_bond_strength{'t'}{'L{'} = NO_BREAK;
        $binary_bond_strength{'i'}{'L{'} = NO_BREAK;

        # Fix for c250: set strength for new 'S' to be same as 'i'
        # testfile is test11/Hub.pm
        $binary_bond_strength{'S'}{'L{'} = NO_BREAK;

        # As a defensive measure, do not break between a '(' and a
        # filehandle.  In some cases, this can cause an error.  For
        # example, the following program works:
        #    my $msg="hi!\n";
        #    print
        #    ( STDOUT
        #    $msg
        #    );
        #
        # But this program fails:
        #    my $msg="hi!\n";
        #    print
        #    (
        #    STDOUT
        #    $msg
        #    );
        #
        # This is normally only a problem with the 'extrude' option
        $binary_bond_strength{'(('}{'Y'} = NO_BREAK;
        $binary_bond_strength{'{('}{'Y'} = NO_BREAK;

        # never break between sub name and opening paren
        $binary_bond_strength{'w'}{'(('} = NO_BREAK;
        $binary_bond_strength{'w'}{'{('} = NO_BREAK;

        # keep '}' together with ';'
        $binary_bond_strength{'}}'}{';'} = NO_BREAK;

        # Breaking before a ++ can cause perl to guess wrong. For
        # example the following line will cause a syntax error
        # with -extrude if we break between '$i' and '++' [fixstyle2]
        #   print( ( $i++ & 1 ) ? $_ : ( $change{$_} || $_ ) );
        $nobreak_lhs{'++'} = NO_BREAK;

        # Do not break before a possible file handle
        $nobreak_lhs{'Z'} = NO_BREAK;

        # use strict hates bare words on any new line.  For
        # example, a break before the underscore here provokes the
        # wrath of use strict:
        # if ( -r $fn && ( -s _ || $AllowZeroFilesize)) {
        $nobreak_rhs{'F'}      = NO_BREAK;
        $nobreak_rhs{'CORE::'} = NO_BREAK;

        # To prevent the tokenizer from switching between types 'w' and 'G' we
        # need to avoid breaking between type 'G' and the following code block
        # brace. Fixes case b929.
        $nobreak_rhs{G} = NO_BREAK;

        #---------------------------------------------------------------
        # Bond Strength BEGIN Section 3.
        # Define tables and values for applying a small bias to the above
        # values.
        #---------------------------------------------------------------
        # Adding a small 'bias' to strengths is a simple way to make a line
        # break at the first of a sequence of identical terms.  For
        # example, to force long string of conditional operators to break
        # with each line ending in a ':', we can add a small number to the
        # bond strength of each ':' (colon.t)
        @bias_tokens = qw( : && || f and or . );       # tokens which get bias
        %bias_hash   = map { $_ => 0 } @bias_tokens;
        $delta_bias  = 0.0001;    # a very small strength level
        return;

    } ## end sub initialize_bond_strength_hashes

    use constant DEBUG_BOND => 0;

    sub set_bond_strengths {

        my ($self) = @_;

        #-----------------------------------------------------------------
        # Define a 'bond strength' for each token pair in an output batch.
        # See comments above for definition of bond strength.
        #-----------------------------------------------------------------

        my $rbond_strength_to_go = [];

        my $rLL               = $self->[_rLL_];
        my $rK_weld_right     = $self->[_rK_weld_right_];
        my $rK_weld_left      = $self->[_rK_weld_left_];
        my $ris_list_by_seqno = $self->[_ris_list_by_seqno_];

        # patch-its always ok to break at end of line
        $nobreak_to_go[$max_index_to_go] = 0;

        # we start a new set of bias values for each line
        %bias = %bias_hash;

        my $code_bias = -.01;    # bias for closing block braces

        my $type         = 'b';
        my $token        = SPACE;
        my $token_length = 1;
        my $last_type;
        my $last_nonblank_type  = $type;
        my $last_nonblank_token = $token;
        my $list_str            = $left_bond_strength{'?'};

        my ( $bond_str_1, $bond_str_2, $bond_str_3, $bond_str_4 );

        my ( $block_type, $i_next, $i_next_nonblank, $next_nonblank_token,
            $next_nonblank_type, $next_token, $next_type,
            $total_nesting_depth, );

        # main loop to compute bond strengths between each pair of tokens
        foreach my $i ( 0 .. $max_index_to_go ) {
            $last_type = $type;
            if ( $type ne 'b' ) {
                $last_nonblank_type  = $type;
                $last_nonblank_token = $token;
            }
            $type = $types_to_go[$i];

            # strength on both sides of a blank is the same
            if ( $type eq 'b' && $last_type ne 'b' ) {
                $rbond_strength_to_go->[$i] = $rbond_strength_to_go->[ $i - 1 ];
                $nobreak_to_go[$i] ||= $nobreak_to_go[ $i - 1 ]; # fix for b1257
                next;
            }

            $token               = $tokens_to_go[$i];
            $token_length        = $token_lengths_to_go[$i];
            $block_type          = $block_type_to_go[$i];
            $i_next              = $i + 1;
            $next_type           = $types_to_go[$i_next];
            $next_token          = $tokens_to_go[$i_next];
            $total_nesting_depth = $nesting_depth_to_go[$i_next];
            $i_next_nonblank     = ( ( $next_type eq 'b' ) ? $i + 2 : $i + 1 );
            $next_nonblank_type  = $types_to_go[$i_next_nonblank];
            $next_nonblank_token = $tokens_to_go[$i_next_nonblank];

            my $seqno               = $type_sequence_to_go[$i];
            my $next_nonblank_seqno = $type_sequence_to_go[$i_next_nonblank];

            # We are computing the strength of the bond between the current
            # token and the NEXT token.

            #---------------------------------------------------------------
            # Bond Strength Section 1:
            # First Approximation.
            # Use minimum of individual left and right tabulated bond
            # strengths.
            #---------------------------------------------------------------
            my $bsr = $right_bond_strength{$type};
            my $bsl = $left_bond_strength{$next_nonblank_type};

            # define right bond strengths of certain keywords
            if ( $type eq 'k' ) {
                if ( defined( $right_bond_strength{$token} ) ) {
                    $bsr = $right_bond_strength{$token};
                }
            }

            # set terminal bond strength to the nominal value
            # this will cause good preceding breaks to be retained
            if ( $i_next_nonblank > $max_index_to_go ) {
                $bsl = NOMINAL;

                # But weaken the bond at a 'missing terminal comma'.  If an
                # optional comma is missing at the end of a broken list, use
                # the strength of a comma anyway to make formatting the same as
                # if it were there. Fixes issue c133.
                if ( !defined($bsr) || $bsr > VERY_WEAK ) {
                    my $seqno_px = $parent_seqno_to_go[$max_index_to_go];
                    if ( $ris_list_by_seqno->{$seqno_px} ) {
                        my $KK      = $K_to_go[$max_index_to_go];
                        my $Kn      = $self->K_next_nonblank($KK);
                        my $seqno_n = $rLL->[$Kn]->[_TYPE_SEQUENCE_];
                        if ( $seqno_n && $seqno_n eq $seqno_px ) {
                            $bsl = VERY_WEAK;
                        }
                    }
                }
            }

            # define left bond strengths of certain keywords
            if ( $next_nonblank_type eq 'k' ) {
                if ( defined( $left_bond_strength{$next_nonblank_token} ) ) {
                    $bsl = $left_bond_strength{$next_nonblank_token};
                }
            }

            # Use the minimum of the left and right strengths.  Note: it might
            # seem that we would want to keep a NO_BREAK if either token has
            # this value.  This didn't work, for example because in an arrow
            # list, it prevents the comma from separating from the following
            # bare word (which is probably quoted by its arrow).  So necessary
            # NO_BREAK's have to be handled as special cases in the final
            # section.
            if ( !defined($bsr) ) { $bsr = VERY_STRONG }
            if ( !defined($bsl) ) { $bsl = VERY_STRONG }
            my $bond_str = ( $bsr < $bsl ) ? $bsr : $bsl;
            $bond_str_1 = $bond_str if (DEBUG_BOND);

            #---------------------------------------------------------------
            # Bond Strength Section 2:
            # Apply hardwired rules..
            #---------------------------------------------------------------

            # Patch to put terminal or clauses on a new line: Weaken the bond
            # at an || followed by die or similar keyword to make the terminal
            # or clause fall on a new line, like this:
            #
            #   my $class = shift
            #     || die "Cannot add broadcast:  No class identifier found";
            #
            # Otherwise the break will be at the previous '=' since the || and
            # = have the same starting strength and the or is biased, like
            # this:
            #
            # my $class =
            #   shift || die "Cannot add broadcast:  No class identifier found";
            #
            # In any case if the user places a break at either the = or the ||
            # it should remain there.
            if ( $type eq '||' || $type eq 'k' && $token eq 'or' ) {

                #    /^(die|confess|croak|warn)$/
                if ( $is_die_confess_croak_warn{$next_nonblank_token} ) {
                    if ( $want_break_before{$token} && $i > 0 ) {
                        $rbond_strength_to_go->[ $i - 1 ] -= $delta_bias;

                        # keep bond strength of a token and its following blank
                        # the same
                        if ( $types_to_go[ $i - 1 ] eq 'b' && $i > 2 ) {
                            $rbond_strength_to_go->[ $i - 2 ] -= $delta_bias;
                        }
                    }
                    else {
                        $bond_str -= $delta_bias;
                    }
                }
            }

            # good to break after end of code blocks
            if ( $type eq '}' && $block_type && $next_nonblank_type ne ';' ) {

                $bond_str = 0.5 * WEAK + 0.5 * VERY_WEAK + $code_bias;
                $code_bias += $delta_bias;
            }

            if ( $type eq 'k' ) {

                # allow certain control keywords to stand out
                if (   $next_nonblank_type eq 'k'
                    && $is_last_next_redo_return{$token} )
                {
                    $bond_str = 0.45 * WEAK + 0.55 * VERY_WEAK;
                }

                # Don't break after keyword my.  This is a quick fix for a
                # rare problem with perl. An example is this line from file
                # Container.pm:

                # foreach my $question( Debian::DebConf::ConfigDb::gettree(
                # $this->{'question'} ) )

                if ( $token eq 'my' ) {
                    $bond_str = NO_BREAK;
                }

            }

            if ( $next_nonblank_type eq 'k' && $type ne 'CORE::' ) {

                if ( $is_keyword_returning_list{$next_nonblank_token} ) {
                    $bond_str = $list_str if ( $bond_str > $list_str );
                }

                # keywords like 'unless', 'if', etc, within statements
                # make good breaks
                if ( $is_good_keyword_breakpoint{$next_nonblank_token} ) {
                    $bond_str = VERY_WEAK / 1.05;
                }
            }

            # try not to break before a comma-arrow
            elsif ( $next_nonblank_type eq '=>' ) {
                if ( $bond_str < STRONG ) { $bond_str = STRONG }
            }
            else {
                ## ok - not special
            }

            #---------------------------------------------------------------
            # Additional hardwired NOBREAK rules
            #---------------------------------------------------------------

            # map1.t -- correct for a quirk in perl
            if (   $token eq '('
                && $next_nonblank_type eq 'i'
                && $last_nonblank_type eq 'k'
                && $is_sort_map_grep{$last_nonblank_token} )

              #     /^(sort|map|grep)$/ )
            {
                $bond_str = NO_BREAK;
            }

            # extrude.t: do not break before paren at:
            #    -l pid_filename(
            if ( $last_nonblank_type eq 'F' && $next_nonblank_token eq '(' ) {
                $bond_str = NO_BREAK;
            }

            # OLD COMMENT: In older version of perl, use strict can cause
            # problems with breaks before bare words following opening parens.
            # For example, this will fail under older versions if a break is
            # made between '(' and 'MAIL':

            # use strict; open( MAIL, "a long filename or command"); close MAIL;

            # NEW COMMENT: Third fix for b1213:
            # This option does not seem to be needed any longer, and it can
            # cause instabilities.  It can be turned off, but to minimize
            # changes to existing formatting it is retained only in the case
            # where the previous token was 'open' and there was no line break.
            # Even this could eventually be removed if it causes instability.
            if ( $type eq '{' ) {

                if (   $token eq '('
                    && $next_nonblank_type eq 'w'
                    && $last_nonblank_type eq 'k'
                    && $last_nonblank_token eq 'open'
                    && !$old_breakpoint_to_go[$i] )
                {
                    $bond_str = NO_BREAK;
                }
            }

            # Do not break between a possible filehandle and a ? or / and do
            # not introduce a break after it if there is no blank
            # (extrude.t)
            elsif ( $type eq 'Z' ) {

                # don't break..
                if (

                    # if there is no blank and we do not want one. Examples:
                    #    print $x++    # do not break after $x
                    #    print HTML"HELLO"   # break ok after HTML
                    (
                           $next_type ne 'b'
                        && defined( $want_left_space{$next_type} )
                        && $want_left_space{$next_type} == WS_NO
                    )

                    # or we might be followed by the start of a quote,
                    # and this is not an existing breakpoint; fixes c039.
                    || !$old_breakpoint_to_go[$i]
                    && substr( $next_nonblank_token, 0, 1 ) eq '/'

                  )
                {
                    $bond_str = NO_BREAK;
                }
            }
            else {
                ## ok - not special
            }

            # Breaking before a ? before a quote can cause trouble if
            # they are not separated by a blank.
            # Example: a syntax error occurs if you break before the ? here
            #  my$logic=join$all?' && ':' || ',@regexps;
            # From: Professional_Perl_Programming_Code/multifind.pl
            if ( $next_nonblank_type eq '?' ) {
                $bond_str = NO_BREAK
                  if ( $types_to_go[ $i_next_nonblank + 1 ] eq 'Q' );
            }

            # Breaking before a . followed by a number
            # can cause trouble if there is no intervening space
            # Example: a syntax error occurs if you break before the .2 here
            #  $str .= pack($endian.2, ensurrogate($ord));
            # From: perl58/Unicode.pm
            elsif ( $next_nonblank_type eq '.' ) {
                $bond_str = NO_BREAK
                  if ( $types_to_go[ $i_next_nonblank + 1 ] eq 'n' );
            }

            # Fix for c039
            elsif ( $type eq 'w' ) {
                $bond_str = NO_BREAK
                  if ( !$old_breakpoint_to_go[$i]
                    && substr( $next_nonblank_token, 0, 1 ) eq '/'
                    && $next_nonblank_type ne '//' );
            }
            else {
                ## ok - not special
            }

            $bond_str_2 = $bond_str if (DEBUG_BOND);

            #---------------------------------------------------------------
            # End of hardwired rules
            #---------------------------------------------------------------

            #---------------------------------------------------------------
            # Bond Strength Section 3:
            # Apply table rules. These have priority over the above
            # hardwired rules.
            #---------------------------------------------------------------

            my $tabulated_bond_str;
            my $ltype = $type;
            my $rtype = $next_nonblank_type;
            if ( $seqno && $is_container_token{$token} ) {
                $ltype = $type . $token;
            }

            if (   $next_nonblank_seqno
                && $is_container_token{$next_nonblank_token} )
            {
                $rtype = $next_nonblank_type . $next_nonblank_token;

                # Alternate Fix #1 for issue b1299.  This version makes the
                # decision as soon as possible.  See Alternate Fix #2 also.
                # Do not separate a bareword identifier from its paren: b1299
                # This is currently needed for stability because if the bareword
                # gets separated from a preceding '->' and following '(' then
                # the tokenizer may switch from type 'i' to type 'w'.  This
                # patch will prevent this by keeping it adjacent to its '('.
##              if (   $next_nonblank_token eq '('
##                  && $ltype eq 'i'
##                  && substr( $token, 0, 1 ) =~ /^\w$/ )
##              {
##                  $ltype = 'w';
##              }
            }

            # apply binary rules which apply regardless of space between tokens
            if ( $binary_bond_strength{$ltype}{$rtype} ) {
                $bond_str           = $binary_bond_strength{$ltype}{$rtype};
                $tabulated_bond_str = $bond_str;
            }

            # apply binary rules which apply only if no space between tokens
            if ( $binary_bond_strength_nospace{$ltype}{$next_type} ) {
                $bond_str           = $binary_bond_strength{$ltype}{$next_type};
                $tabulated_bond_str = $bond_str;
            }

            if ( $nobreak_rhs{$ltype} || $nobreak_lhs{$rtype} ) {
                $bond_str           = NO_BREAK;
                $tabulated_bond_str = $bond_str;
            }

            $bond_str_3 = $bond_str if (DEBUG_BOND);

            # If the hardwired rules conflict with the tabulated bond
            # strength then there is an inconsistency that should be fixed
            DEBUG_BOND
              && $tabulated_bond_str
              && $bond_str_1
              && $bond_str_1 != $bond_str_2
              && $bond_str_2 != $tabulated_bond_str
              && do {
                print {*STDOUT}
"BOND_TABLES: ltype=$ltype rtype=$rtype $bond_str_1->$bond_str_2->$bond_str_3\n";
              };

           #-----------------------------------------------------------------
           # Bond Strength Section 4:
           # Modify strengths of certain tokens which often occur in sequence
           # by adding a small bias to each one in turn so that the breaks
           # occur from left to right.
           #
           # Note that we only changing strengths by small amounts here,
           # and usually increasing, so we should not be altering any NO_BREAKs.
           # Other routines which check for NO_BREAKs will use a tolerance
           # of one to avoid any problem.
           #-----------------------------------------------------------------

            # The bias tables use special keys:
            #   $type - if not keyword
            #   $token - if keyword, but map some keywords together
            my $left_key =
              $type eq 'k' ? $token eq 'err' ? 'or' : $token : $type;
            my $right_key =
                $next_nonblank_type eq 'k'
              ? $next_nonblank_token eq 'err'
                  ? 'or'
                  : $next_nonblank_token
              : $next_nonblank_type;

            # bias left token
            if ( defined( $bias{$left_key} ) ) {
                if ( !$want_break_before{$left_key} ) {
                    $bias{$left_key} += $delta_bias;
                    $bond_str += $bias{$left_key};
                }
            }

            # bias right token
            if ( defined( $bias{$right_key} ) ) {
                if ( $want_break_before{$right_key} ) {

                    # for leading '.' align all but 'short' quotes; the idea
                    # is to not place something like "\n" on a single line.
                    if ( $right_key eq '.' ) {

                        my $is_short_quote = $last_nonblank_type eq '.'
                          && ( $token_length <=
                            $rOpts_short_concatenation_item_length )
                          && !$is_closing_token{$token};

                        if ( !$is_short_quote ) {
                            $bias{$right_key} += $delta_bias;
                        }
                    }
                    else {
                        $bias{$right_key} += $delta_bias;
                    }
                    $bond_str += $bias{$right_key};
                }
            }

            $bond_str_4 = $bond_str if (DEBUG_BOND);

            #---------------------------------------------------------------
            # Bond Strength Section 5:
            # Fifth Approximation.
            # Take nesting depth into account by adding the nesting depth
            # to the bond strength.
            #---------------------------------------------------------------
            my $strength;

            if ( defined($bond_str) && !$nobreak_to_go[$i] ) {
                if ( $total_nesting_depth > 0 ) {
                    $strength = $bond_str + $total_nesting_depth;
                }
                else {
                    $strength = $bond_str;
                }
            }
            else {
                $strength = NO_BREAK;

                # For critical code such as lines with here targets we must
                # be absolutely sure that we do not allow a break.  So for
                # these the nobreak flag exceeds 1 as a signal. Otherwise we
                # can run into trouble when small tolerances are added.
                $strength += 1
                  if ( $nobreak_to_go[$i] && $nobreak_to_go[$i] > 1 );
            }

            #---------------------------------------------------------------
            # Bond Strength Section 6:
            # Sixth Approximation. Welds.
            #---------------------------------------------------------------

            # Do not allow a break within welds
            if ( $total_weld_count && $seqno ) {
                my $KK = $K_to_go[$i];
                if ( $rK_weld_right->{$KK} ) {
                    $strength = NO_BREAK;
                }

                # But encourage breaking after opening welded tokens
                elsif ($rK_weld_left->{$KK}
                    && $is_opening_token{$token} )
                {
                    $strength -= 1;
                }
                else {
                    ## ok - not welded left or right
                }
            }

            # always break after side comment
            if ( $type eq '#' ) { $strength = 0 }

            $rbond_strength_to_go->[$i] = $strength;

            # Fix for case c001: be sure NO_BREAK's are enforced by later
            # routines, except at a '?' because '?' as quote delimiter is
            # deprecated.
            if ( $strength >= NO_BREAK && $next_nonblank_type ne '?' ) {
                $nobreak_to_go[$i] ||= 1;
            }

            DEBUG_BOND && do {
                my $str = substr( $token, 0, 15 );
                $str .= SPACE x ( 16 - length($str) );
                print {*STDOUT}
"BOND:  i=$i $str $type $next_nonblank_type depth=$total_nesting_depth strength=$bond_str_1 -> $bond_str_2 -> $bond_str_3 -> $bond_str_4 $bond_str -> $strength \n";

                # reset for next pass
                $bond_str_1 = $bond_str_2 = $bond_str_3 = $bond_str_4 = undef;
            };

        } ## end main loop
        return $rbond_strength_to_go;
    } ## end sub set_bond_strengths
} ## end closure set_bond_strengths

sub bad_pattern {
    my ($pattern) = @_;

    # See if a pattern will compile.
    # Note: this sub is also called from Tokenizer
    my $regex = eval { qr/$pattern/ };
    return $EVAL_ERROR;
}

{    ## begin closure prepare_cuddled_block_types

    my %no_cuddle;

    # Add keywords here which really should not be cuddled
    BEGIN {
        my @q = qw(if unless for foreach while);
        @no_cuddle{@q} = (1) x scalar(@q);
    }

    sub prepare_cuddled_block_types {

        # the cuddled-else style, if used, is controlled by a hash that
        # we construct here

        # Include keywords here which should not be cuddled

        my $cuddled_string = EMPTY_STRING;
        if ( $rOpts->{'cuddled-else'} ) {

            # set the default
            $cuddled_string = 'elsif else continue catch finally'
              unless ( $rOpts->{'cuddled-block-list-exclusive'} );

            # This is the old equivalent but more complex version
            # $cuddled_string = 'if-elsif-else unless-elsif-else -continue ';

            # Add users other blocks to be cuddled
            my $cuddled_block_list = $rOpts->{'cuddled-block-list'};
            if ($cuddled_block_list) {
                $cuddled_string .= SPACE . $cuddled_block_list;
            }

        }

        # If we have a cuddled string of the form
        #  'try-catch-finally'

        # we want to prepare a hash of the form

        # $rcuddled_block_types = {
        #    'try' => {
        #        'catch'   => 1,
        #        'finally' => 1
        #    },
        # };

        # use -dcbl to dump this hash

        # Multiple such strings are input as a space or comma separated list

        # If we get two lists with the same leading type, such as
        #   -cbl = "-try-catch-finally  -try-catch-otherwise"
        # then they will get merged as follows:
        # $rcuddled_block_types = {
        #    'try' => {
        #        'catch'     => 1,
        #        'finally'   => 2,
        #        'otherwise' => 1,
        #    },
        # };
        # This will allow either type of chain to be followed.

        $cuddled_string =~ s/,/ /g;    # allow space or comma separated lists
        my @cuddled_strings = split /\s+/, $cuddled_string;

        $rcuddled_block_types = {};

        # process each dash-separated string...
        my $string_count = 0;
        foreach my $string (@cuddled_strings) {
            next unless $string;
            my @words = split /-+/, $string;    # allow multiple dashes

            # we could look for and report possible errors here...
            next if ( @words <= 0 );

           # allow either '-continue' or *-continue' for arbitrary starting type
            my $start = '*';

            # a single word without dashes is a secondary block type
            if ( @words > 1 ) {
                $start = shift @words;
            }

            # always make an entry for the leading word. If none follow, this
            # will still prevent a wildcard from matching this word.
            if ( !defined( $rcuddled_block_types->{$start} ) ) {
                $rcuddled_block_types->{$start} = {};
            }

            # The count gives the original word order in case we ever want it.
            $string_count++;
            my $word_count = 0;
            foreach my $word (@words) {
                next unless $word;
                if ( $no_cuddle{$word} ) {
                    Warn(
"## Ignoring keyword '$word' in -cbl; does not seem right\n"
                    );
                    next;
                }
                $word_count++;
                $rcuddled_block_types->{$start}->{$word} =
                  1;    #"$string_count.$word_count";

                # git#9: Remove this word from the list of desired one-line
                # blocks
                $want_one_line_block{$word} = 0;
            }
        }
        return;
    } ## end sub prepare_cuddled_block_types
} ## end closure prepare_cuddled_block_types

sub dump_cuddled_block_list {
    my ($fh) = @_;

    # ORIGINAL METHOD: Here is the format of the cuddled block type hash
    # which controls this routine
    #    my $rcuddled_block_types = {
    #        'if' => {
    #            'else'  => 1,
    #            'elsif' => 1
    #        },
    #        'try' => {
    #            'catch'   => 1,
    #            'finally' => 1
    #        },
    #    };

    # SIMPLIFIED METHOD: the simplified method uses a wildcard for
    # the starting block type and puts all cuddled blocks together:
    #    my $rcuddled_block_types = {
    #        '*' => {
    #            'else'  => 1,
    #            'elsif' => 1
    #            'catch'   => 1,
    #            'finally' => 1
    #        },
    #    };

    # Both methods work, but the simplified method has proven to be adequate and
    # easier to manage.

    my $cuddled_string = $rOpts->{'cuddled-block-list'};
    $cuddled_string = EMPTY_STRING unless $cuddled_string;

    my $flags = EMPTY_STRING;
    $flags .= "-ce" if ( $rOpts->{'cuddled-else'} );
    $flags .= " -cbl='$cuddled_string'";

    if ( !$rOpts->{'cuddled-else'} ) {
        $flags .= "\nNote: You must specify -ce to generate a cuddled hash";
    }

    $fh->print(<<EOM);
------------------------------------------------------------------------
Hash of cuddled block types prepared for a run with these parameters:
  $flags
------------------------------------------------------------------------
EOM

    use Data::Dumper;
    $fh->print( Dumper($rcuddled_block_types) );

    $fh->print(<<EOM);
------------------------------------------------------------------------
EOM
    return;
} ## end sub dump_cuddled_block_list

sub make_static_block_comment_pattern {

    # create the pattern used to identify static block comments
    $static_block_comment_pattern = '^\s*##';

    # allow the user to change it
    if ( $rOpts->{'static-block-comment-prefix'} ) {
        my $prefix = $rOpts->{'static-block-comment-prefix'};
        $prefix =~ s/^\s*//;
        my $pattern = $prefix;

        # user may give leading caret to force matching left comments only
        if ( $prefix !~ /^\^#/ ) {
            if ( $prefix !~ /^#/ ) {
                Die(
"ERROR: the -sbcp prefix is '$prefix' but must begin with '#' or '^#'\n"
                );
            }
            $pattern = '^\s*' . $prefix;
        }
        if ( bad_pattern($pattern) ) {
            Die(
"ERROR: the -sbc prefix '$prefix' causes the invalid regex '$pattern'\n"
            );
        }
        $static_block_comment_pattern = $pattern;
    }
    return;
} ## end sub make_static_block_comment_pattern

sub make_format_skipping_pattern {
    my ( $opt_name, $default ) = @_;
    my $param = $rOpts->{$opt_name};
    if ( !$param ) { $param = $default }
    $param =~ s/^\s*//;
    if ( $param !~ /^#/ ) {
        Die("ERROR: the $opt_name parameter '$param' must begin with '#'\n");
    }
    my $pattern = '^' . $param . '\s';
    if ( bad_pattern($pattern) ) {
        Die(
"ERROR: the $opt_name parameter '$param' causes the invalid regex '$pattern'\n"
        );
    }
    return $pattern;
} ## end sub make_format_skipping_pattern

sub make_non_indenting_brace_pattern {

    # Create the pattern used to identify static side comments.
    # Note that we are ending the pattern in a \s. This will allow
    # the pattern to be followed by a space and some text, or a newline.
    # The pattern is used in sub 'non_indenting_braces'
    $non_indenting_brace_pattern = '^#<<<\s';

    # allow the user to change it
    if ( $rOpts->{'non-indenting-brace-prefix'} ) {
        my $prefix = $rOpts->{'non-indenting-brace-prefix'};
        $prefix =~ s/^\s*//;
        if ( $prefix !~ /^#/ ) {
            Die("ERROR: the -nibp parameter '$prefix' must begin with '#'\n");
        }
        my $pattern = '^' . $prefix . '\s';
        if ( bad_pattern($pattern) ) {
            Die(
"ERROR: the -nibp prefix '$prefix' causes the invalid regex '$pattern'\n"
            );
        }
        $non_indenting_brace_pattern = $pattern;
    }
    return;
} ## end sub make_non_indenting_brace_pattern

sub make_closing_side_comment_list_pattern {

    # turn any input list into a regex for recognizing selected block types
    $closing_side_comment_list_pattern = '^\w+';
    if ( defined( $rOpts->{'closing-side-comment-list'} )
        && $rOpts->{'closing-side-comment-list'} )
    {
        $closing_side_comment_list_pattern =
          make_block_pattern( '-cscl', $rOpts->{'closing-side-comment-list'} );
    }
    return;
} ## end sub make_closing_side_comment_list_pattern

sub make_sub_matching_pattern {

    # Patterns for standardizing matches to block types for regular subs and
    # anonymous subs. Examples
    #  'sub process' is a named sub
    #  'sub ::m' is a named sub
    #  'sub' is an anonymous sub
    #  'sub:' is a label, not a sub
    #  'sub :' is a label, not a sub   ( block type will be <sub:> )
    #   sub'_ is a named sub           ( block type will be <sub '_> )
    #  'substr' is a keyword
    # So note that named subs always have a space after 'sub'
    $SUB_PATTERN  = '^sub\s';         # match normal sub
    $ASUB_PATTERN = '^sub$';          # match anonymous sub
    %matches_ASUB = ( 'sub' => 1 );

    # Fix the patterns to include any sub aliases:
    # Note that any 'sub-alias-list' has been preprocessed to
    # be a trimmed, space-separated list which includes 'sub'
    # for example, it might be 'sub method fun'
    my @words;
    my $sub_alias_list = $rOpts->{'sub-alias-list'};
    if ($sub_alias_list) {
        @words = split /\s+/, $sub_alias_list;
    }
    else {
        push @words, 'sub';
    }

    #   add 'method' unless use-feature='noclass' is set.
    if ( !defined( $rOpts->{'use-feature'} )
        || $rOpts->{'use-feature'} !~ /\bnoclass\b/ )
    {
        push @words, 'method';
    }

    # Note (see also RT #133130): These patterns are used by
    # sub make_block_pattern, which is used for making most patterns.
    # So this sub needs to be called before other pattern-making routines.
    if ( @words > 1 ) {

        # Two ways are provided to match an anonymous sub:
        # $ASUB_PATTERN - with a regex (old method, slow)
        # %matches_ASUB - with a hash lookup (new method, faster)

        @matches_ASUB{@words} = (1) x scalar(@words);
        my $alias_list = join '|', keys %matches_ASUB;
        $SUB_PATTERN  =~ s/sub/\($alias_list\)/;
        $ASUB_PATTERN =~ s/sub/\($alias_list\)/;
    }
    return;
} ## end sub make_sub_matching_pattern

sub make_bl_pattern {

    # Set defaults lists to retain historical default behavior for -bl:
    my $bl_list_string           = '*';
    my $bl_exclusion_list_string = 'sort map grep eval asub';

    if ( defined( $rOpts->{'brace-left-list'} )
        && $rOpts->{'brace-left-list'} )
    {
        $bl_list_string = $rOpts->{'brace-left-list'};
    }
    if ( $bl_list_string =~ /\bsub\b/ ) {
        $rOpts->{'opening-sub-brace-on-new-line'} ||=
          $rOpts->{'opening-brace-on-new-line'};
    }
    if ( $bl_list_string =~ /\basub\b/ ) {
        $rOpts->{'opening-anonymous-sub-brace-on-new-line'} ||=
          $rOpts->{'opening-brace-on-new-line'};
    }

    $bl_pattern = make_block_pattern( '-bll', $bl_list_string );

    # for -bl, a list with '*' turns on -sbl and -asbl
    if ( $bl_pattern =~ /\.\*/ ) {
        $rOpts->{'opening-sub-brace-on-new-line'} ||=
          $rOpts->{'opening-brace-on-new-line'};
        $rOpts->{'opening-anonymous-sub-brace-on-new-line'} ||=
          $rOpts->{'opening-anonymous-brace-on-new-line'};
    }

    if ( defined( $rOpts->{'brace-left-exclusion-list'} )
        && $rOpts->{'brace-left-exclusion-list'} )
    {
        $bl_exclusion_list_string = $rOpts->{'brace-left-exclusion-list'};
        if ( $bl_exclusion_list_string =~ /\bsub\b/ ) {
            $rOpts->{'opening-sub-brace-on-new-line'} = 0;
        }
        if ( $bl_exclusion_list_string =~ /\basub\b/ ) {
            $rOpts->{'opening-anonymous-sub-brace-on-new-line'} = 0;
        }
    }

    $bl_exclusion_pattern =
      make_block_pattern( '-blxl', $bl_exclusion_list_string );
    return;
} ## end sub make_bl_pattern

sub make_bli_pattern {

    # default list of block types for which -bli would apply
    my $bli_list_string = 'if else elsif unless while for foreach do : sub';
    my $bli_exclusion_list_string = SPACE;

    if ( defined( $rOpts->{'brace-left-and-indent-list'} )
        && $rOpts->{'brace-left-and-indent-list'} )
    {
        $bli_list_string = $rOpts->{'brace-left-and-indent-list'};
    }

    $bli_pattern = make_block_pattern( '-blil', $bli_list_string );

    if ( defined( $rOpts->{'brace-left-and-indent-exclusion-list'} )
        && $rOpts->{'brace-left-and-indent-exclusion-list'} )
    {
        $bli_exclusion_list_string =
          $rOpts->{'brace-left-and-indent-exclusion-list'};
    }
    $bli_exclusion_pattern =
      make_block_pattern( '-blixl', $bli_exclusion_list_string );
    return;
} ## end sub make_bli_pattern

sub make_keyword_group_list_pattern {

    # turn any input list into a regex for recognizing selected block types.
    # Here are the defaults:
    $keyword_group_list_pattern         = '^(our|local|my|use|require|)$';
    $keyword_group_list_comment_pattern = EMPTY_STRING;
    if ( defined( $rOpts->{'keyword-group-blanks-list'} )
        && $rOpts->{'keyword-group-blanks-list'} )
    {
        my @words = split /\s+/, $rOpts->{'keyword-group-blanks-list'};
        my @keyword_list;
        my @comment_list;
        foreach my $word (@words) {
            if ( $word eq 'BC' || $word eq 'SBC' ) {
                push @comment_list, $word;
                if ( $word eq 'SBC' ) { push @comment_list, 'SBCX' }
            }
            else {
                push @keyword_list, $word;
            }
        }
        $keyword_group_list_pattern =
          make_block_pattern( '-kgbl', $rOpts->{'keyword-group-blanks-list'} );
        $keyword_group_list_comment_pattern =
          make_block_pattern( '-kgbl', join( SPACE, @comment_list ) );
    }
    return;
} ## end sub make_keyword_group_list_pattern

sub make_block_brace_vertical_tightness_pattern {

    # turn any input list into a regex for recognizing selected block types
    $block_brace_vertical_tightness_pattern =
      '^((if|else|elsif|unless|while|for|foreach|do|\w+:)$|sub)';
    if ( defined( $rOpts->{'block-brace-vertical-tightness-list'} )
        && $rOpts->{'block-brace-vertical-tightness-list'} )
    {
        $block_brace_vertical_tightness_pattern =
          make_block_pattern( '-bbvtl',
            $rOpts->{'block-brace-vertical-tightness-list'} );
    }
    return;
} ## end sub make_block_brace_vertical_tightness_pattern

sub make_blank_line_pattern {

    $blank_lines_before_closing_block_pattern = $SUB_PATTERN;
    my $key = 'blank-lines-before-closing-block-list';
    if ( defined( $rOpts->{$key} ) && $rOpts->{$key} ) {
        $blank_lines_before_closing_block_pattern =
          make_block_pattern( '-blbcl', $rOpts->{$key} );
    }

    $blank_lines_after_opening_block_pattern = $SUB_PATTERN;
    $key = 'blank-lines-after-opening-block-list';
    if ( defined( $rOpts->{$key} ) && $rOpts->{$key} ) {
        $blank_lines_after_opening_block_pattern =
          make_block_pattern( '-blaol', $rOpts->{$key} );
    }
    return;
} ## end sub make_blank_line_pattern

sub make_block_pattern {

    #  given a string of block-type keywords, return a regex to match them
    #  The only tricky part is that labels are indicated with a single ':'
    #  and the 'sub' token text may have additional text after it (name of
    #  sub).
    #
    #  Example:
    #
    #   input string: "if else elsif unless while for foreach do : sub";
    #   pattern:  '^((if|else|elsif|unless|while|for|foreach|do|\w+:)$|sub)';

    #  Minor Update:
    #
    #  To distinguish between anonymous subs and named subs, use 'sub' to
    #   indicate a named sub, and 'asub' to indicate an anonymous sub

    my ( $abbrev, $string ) = @_;
    my @list  = split_words($string);
    my @words = ();
    my %seen;
    for my $i (@list) {
        if ( $i eq '*' ) { my $pattern = '^.*'; return $pattern }
        next if $seen{$i};
        $seen{$i} = 1;
        if ( $i eq 'sub' ) {
        }
        elsif ( $i eq 'asub' ) {
        }
        elsif ( $i eq ';' ) {
            push @words, ';';
        }
        elsif ( $i eq '{' ) {
            push @words, '\{';
        }
        elsif ( $i eq ':' ) {
            push @words, '\w+:';
        }
        elsif ( $i =~ /^\w/ ) {
            push @words, $i;
        }
        else {
            Warn("unrecognized block type $i after $abbrev, ignoring\n");
        }
    }

    # Fix 2 for c091, prevent the pattern from matching an empty string
    # '1 ' is an impossible block name.
    if ( !@words ) { push @words, "1 " }

    my $pattern      = '(' . join( '|', @words ) . ')$';
    my $sub_patterns = EMPTY_STRING;
    if ( $seen{'sub'} ) {
        $sub_patterns .= '|' . $SUB_PATTERN;
    }
    if ( $seen{'asub'} ) {
        $sub_patterns .= '|' . $ASUB_PATTERN;
    }
    if ($sub_patterns) {
        $pattern = '(' . $pattern . $sub_patterns . ')';
    }
    $pattern = '^' . $pattern;
    return $pattern;
} ## end sub make_block_pattern

sub make_static_side_comment_pattern {

    # create the pattern used to identify static side comments
    $static_side_comment_pattern = '^##';

    # allow the user to change it
    if ( $rOpts->{'static-side-comment-prefix'} ) {
        my $prefix = $rOpts->{'static-side-comment-prefix'};
        $prefix =~ s/^\s*//;
        my $pattern = '^' . $prefix;
        if ( bad_pattern($pattern) ) {
            Die(
"ERROR: the -sscp prefix '$prefix' causes the invalid regex '$pattern'\n"
            );
        }
        $static_side_comment_pattern = $pattern;
    }
    return;
} ## end sub make_static_side_comment_pattern

sub make_closing_side_comment_prefix {

    # Be sure we have a valid closing side comment prefix
    my $csc_prefix = $rOpts->{'closing-side-comment-prefix'};
    my $csc_prefix_pattern;
    if ( !defined($csc_prefix) ) {
        $csc_prefix         = '## end';
        $csc_prefix_pattern = '^##\s+end';
    }
    else {
        my $test_csc_prefix = $csc_prefix;
        if ( $test_csc_prefix !~ /^#/ ) {
            $test_csc_prefix = '#' . $test_csc_prefix;
        }

        # make a regex to recognize the prefix
        my $test_csc_prefix_pattern = $test_csc_prefix;

        # escape any special characters
        $test_csc_prefix_pattern =~ s/([^#\s\w])/\\$1/g;

        $test_csc_prefix_pattern = '^' . $test_csc_prefix_pattern;

        # allow exact number of intermediate spaces to vary
        $test_csc_prefix_pattern =~ s/\s+/\\s\+/g;

        # make sure we have a good pattern
        # if we fail this we probably have an error in escaping
        # characters.

        if ( bad_pattern($test_csc_prefix_pattern) ) {

            # shouldn't happen..must have screwed up escaping, above
            if (DEVEL_MODE) {
                Fault(<<EOM);
Program Error: the -cscp prefix '$csc_prefix' caused the invalid regex '$csc_prefix_pattern'
EOM
            }

            # just warn and keep going with defaults
            Warn(
"Error: the -cscp prefix '$csc_prefix' caused the invalid regex '$csc_prefix_pattern'\n"
            );
            Warn("Please consider using a simpler -cscp prefix\n");
            Warn("Using default -cscp instead; please check output\n");
        }
        else {
            $csc_prefix         = $test_csc_prefix;
            $csc_prefix_pattern = $test_csc_prefix_pattern;
        }
    }
    $rOpts->{'closing-side-comment-prefix'} = $csc_prefix;
    $closing_side_comment_prefix_pattern = $csc_prefix_pattern;
    return;
} ## end sub make_closing_side_comment_prefix

##################################################
# CODE SECTION 4: receive lines from the tokenizer
##################################################

{    ## begin closure write_line

    my $nesting_depth;

    # Variables used by sub check_sequence_numbers:
    my $last_seqno;
    my %saw_opening_seqno;
    my %saw_closing_seqno;
    my $initial_seqno;

    sub initialize_write_line {

        $nesting_depth = undef;

        $last_seqno        = SEQ_ROOT;
        %saw_opening_seqno = ();
        %saw_closing_seqno = ();

        return;
    } ## end sub initialize_write_line

    sub check_sequence_numbers {

        # Routine for checking sequence numbers.  This only needs to be
        # done occasionally in DEVEL_MODE to be sure everything is working
        # correctly.
        my ( $rtokens, $rtoken_type, $rtype_sequence, $input_line_no ) = @_;
        my $jmax = @{$rtokens} - 1;
        return if ( $jmax < 0 );
        foreach my $j ( 0 .. $jmax ) {
            my $seqno = $rtype_sequence->[$j];
            my $token = $rtokens->[$j];
            my $type  = $rtoken_type->[$j];
            $seqno = EMPTY_STRING unless ( defined($seqno) );
            my $err_msg =
"Error at j=$j, line number $input_line_no, seqno='$seqno', type='$type', tok='$token':\n";

            if ( !$seqno ) {

           # Sequence numbers are generated for opening tokens, so every opening
           # token should be sequenced.  Closing tokens will be unsequenced
           # if they do not have a matching opening token.
                if (   $is_opening_sequence_token{$token}
                    && $type ne 'q'
                    && $type ne 'Q' )
                {
                    Fault(
                        <<EOM
$err_msg Unexpected opening token without sequence number
EOM
                    );
                }
            }
            else {

                # Save starting seqno to identify sequence method:
                # New method starts with 2 and has continuous numbering
                # Old method starts with >2 and may have gaps
                if ( !defined($initial_seqno) ) { $initial_seqno = $seqno }

                if ( $is_opening_sequence_token{$token} ) {

                    # New method should have continuous numbering
                    if ( $initial_seqno == 2 && $seqno != $last_seqno + 1 ) {
                        Fault(
                            <<EOM
$err_msg Unexpected opening sequence number: previous seqno=$last_seqno, but seqno= $seqno
EOM
                        );
                    }
                    $last_seqno = $seqno;

                    # Numbers must be unique
                    if ( $saw_opening_seqno{$seqno} ) {
                        my $lno = $saw_opening_seqno{$seqno};
                        Fault(
                            <<EOM
$err_msg Already saw an opening tokens at line $lno with this sequence number
EOM
                        );
                    }
                    $saw_opening_seqno{$seqno} = $input_line_no;
                }

                # only one closing item per seqno
                elsif ( $is_closing_sequence_token{$token} ) {
                    if ( $saw_closing_seqno{$seqno} ) {
                        my $lno = $saw_closing_seqno{$seqno};
                        Fault(
                            <<EOM
$err_msg Already saw a closing token with this seqno  at line $lno
EOM
                        );
                    }
                    $saw_closing_seqno{$seqno} = $input_line_no;

                    # Every closing seqno must have an opening seqno
                    if ( !$saw_opening_seqno{$seqno} ) {
                        Fault(
                            <<EOM
$err_msg Saw a closing token but no opening token with this seqno
EOM
                        );
                    }
                }

                # Sequenced items must be opening or closing
                else {
                    Fault(
                        <<EOM
$err_msg Unexpected token type with a sequence number
EOM
                    );
                }
            }
        }
        return;
    } ## end sub check_sequence_numbers

    sub store_block_type {
        my ( $self, $block_type, $seqno ) = @_;

        return if ( !$block_type );

        # Save the type of a block in a hash using sequence number as key
        $self->[_rblock_type_of_seqno_]->{$seqno} = $block_type;

        # and save named subs and anynymous subs in separate hashes so that
        # we only have to do the pattern tests once.
        if ( $matches_ASUB{$block_type} ) {
            $self->[_ris_asub_block_]->{$seqno} = 1;
        }
        elsif ( $block_type =~ /$SUB_PATTERN/ ) {
            $self->[_ris_sub_block_]->{$seqno} = 1;
        }
        else {
            ## ok - not a sub
        }
        return;
    } ## end sub store_block_type

    # hash keys which are common to old and new line_of_tokens
    my @common_keys;

    BEGIN {
        @common_keys = qw(
          _curly_brace_depth
          _ending_in_quote
          _guessed_indentation_level
          _line_number
          _line_text
          _line_type
          _paren_depth
          _quote_character
          _square_bracket_depth
          _starting_in_quote
        );
    }

    sub write_line {

        # This routine receives lines one-by-one from the tokenizer and stores
        # them in a format suitable for further processing.  After the last
        # line has been sent, the tokenizer will call sub 'finish_formatting'
        # to do the actual formatting.

        my ( $self, $line_of_tokens_old ) = @_;

        my $rLL            = $self->[_rLL_];
        my $line_of_tokens = {};

        # copy common hash key values
        @{$line_of_tokens}{@common_keys} = @{$line_of_tokens_old}{@common_keys};

        my $line_type = $line_of_tokens_old->{_line_type};
        my $tee_output;

        my $Klimit = $self->[_Klimit_];
        my $Kfirst;

        # Handle line of non-code
        if ( $line_type ne 'CODE' ) {
            $tee_output ||= $rOpts_tee_pod
              && substr( $line_type, 0, 3 ) eq 'POD';

            $line_of_tokens->{_level_0}              = 0;
            $line_of_tokens->{_ci_level_0}           = 0;
            $line_of_tokens->{_nesting_blocks_0}     = EMPTY_STRING;
            $line_of_tokens->{_nesting_tokens_0}     = EMPTY_STRING;
            $line_of_tokens->{_ended_in_blank_token} = undef;

        }

        # Handle line of code
        else {

            my $rtokens = $line_of_tokens_old->{_rtokens};
            my $jmax    = @{$rtokens} - 1;

            if ( $jmax >= 0 ) {

                $Kfirst = defined($Klimit) ? $Klimit + 1 : 0;

                #----------------------------
                # get the tokens on this line
                #----------------------------
                $self->write_line_inner_loop( $line_of_tokens_old,
                    $line_of_tokens );

                # update Klimit for added tokens
                $Klimit = @{$rLL} - 1;

            } ## end if ( $jmax >= 0 )
            else {

                # blank line
                $line_of_tokens->{_level_0}              = 0;
                $line_of_tokens->{_ci_level_0}           = 0;
                $line_of_tokens->{_nesting_blocks_0}     = EMPTY_STRING;
                $line_of_tokens->{_nesting_tokens_0}     = EMPTY_STRING;
                $line_of_tokens->{_ended_in_blank_token} = undef;

            }

            $tee_output ||=
                 $rOpts_tee_block_comments
              && $jmax == 0
              && $rLL->[$Kfirst]->[_TYPE_] eq '#';

            $tee_output ||=
                 $rOpts_tee_side_comments
              && defined($Kfirst)
              && $Klimit > $Kfirst
              && $rLL->[$Klimit]->[_TYPE_] eq '#';

        } ## end if ( $line_type eq 'CODE')

        # Finish storing line variables
        $line_of_tokens->{_rK_range} = [ $Kfirst, $Klimit ];
        $self->[_Klimit_] = $Klimit;
        my $rlines = $self->[_rlines_];
        push @{$rlines}, $line_of_tokens;

        if ($tee_output) {
            my $fh_tee    = $self->[_fh_tee_];
            my $line_text = $line_of_tokens_old->{_line_text};
            $fh_tee->print($line_text) if ($fh_tee);
        }

        return;
    } ## end sub write_line

    sub write_line_inner_loop {
        my ( $self, $line_of_tokens_old, $line_of_tokens ) = @_;

        #---------------------------------------------------------------------
        # Copy the tokens on one line received from the tokenizer to their new
        # storage locations.
        #---------------------------------------------------------------------

        # Input parameters:
        #  $line_of_tokens_old = line received from tokenizer
        #  $line_of_tokens     = line of tokens being formed for formatter

        my $rtokens = $line_of_tokens_old->{_rtokens};
        my $jmax    = @{$rtokens} - 1;
        if ( $jmax < 0 ) {

            # safety check; shouldn't happen
            DEVEL_MODE && Fault("unexpected jmax=$jmax\n");
            return;
        }

        my $line_index     = $line_of_tokens_old->{_line_number} - 1;
        my $rtoken_type    = $line_of_tokens_old->{_rtoken_type};
        my $rblock_type    = $line_of_tokens_old->{_rblock_type};
        my $rtype_sequence = $line_of_tokens_old->{_rtype_sequence};
        my $rlevels        = $line_of_tokens_old->{_rlevels};

        my $rLL                     = $self->[_rLL_];
        my $rSS                     = $self->[_rSS_];
        my $rdepth_of_opening_seqno = $self->[_rdepth_of_opening_seqno_];

        DEVEL_MODE
          && check_sequence_numbers( $rtokens, $rtoken_type,
            $rtype_sequence, $line_index + 1 );

        # Find the starting nesting depth ...
        # It must be the value of variable 'level' of the first token
        # because the nesting depth is used as a token tag in the
        # vertical aligner and is compared to actual levels.
        # So vertical alignment problems will occur with any other
        # starting value.
        if ( !defined($nesting_depth) ) {
            $nesting_depth                       = $rlevels->[0];
            $nesting_depth                       = 0 if ( $nesting_depth < 0 );
            $rdepth_of_opening_seqno->[SEQ_ROOT] = $nesting_depth - 1;
        }

        my $j = -1;

        # NOTE: coding efficiency is critical in this loop over all tokens
        foreach my $token ( @{$rtokens} ) {

            # NOTE: Do not clip the 'level' variable yet if it is negative. We
            # will do that later, in sub 'store_token_to_go'. The reason is
            # that in files with level errors, the logic in 'weld_cuddled_else'
            # uses a stack logic that will give bad welds if we clip levels
            # here. (A recent update will probably not even allow negative
            # levels to arrive here any longer).

            my $seqno = EMPTY_STRING;

            # Handle tokens with sequence numbers ...
            # note the ++ increment hidden here for efficiency
            if ( $rtype_sequence->[ ++$j ] ) {
                $seqno = $rtype_sequence->[$j];
                my $sign = 1;
                if ( $is_opening_token{$token} ) {
                    $self->[_K_opening_container_]->{$seqno} = @{$rLL};
                    $rdepth_of_opening_seqno->[$seqno] = $nesting_depth;
                    $nesting_depth++;

                    # Save a sequenced block type at its opening token.
                    # Note that unsequenced block types can occur in
                    # unbalanced code with errors but are ignored here.
                    $self->store_block_type( $rblock_type->[$j], $seqno )
                      if ( $rblock_type->[$j] );
                }
                elsif ( $is_closing_token{$token} ) {

                    # The opening depth should always be defined, and
                    # it should equal $nesting_depth-1.  To protect
                    # against unforseen error conditions, however, we
                    # will check this and fix things if necessary.  For
                    # a test case see issue c055.
                    my $opening_depth = $rdepth_of_opening_seqno->[$seqno];
                    if ( !defined($opening_depth) ) {
                        $opening_depth = $nesting_depth - 1;
                        $opening_depth = 0 if ( $opening_depth < 0 );
                        $rdepth_of_opening_seqno->[$seqno] = $opening_depth;

                        # This is not fatal but should not happen.  The
                        # tokenizer generates sequence numbers
                        # incrementally upon encountering each new
                        # opening token, so every positive sequence
                        # number should correspond to an opening token.
                        DEVEL_MODE && Fault(<<EOM);
No opening token seen for closing token = '$token' at seq=$seqno at depth=$opening_depth
EOM
                    }
                    $self->[_K_closing_container_]->{$seqno} = @{$rLL};
                    $nesting_depth                           = $opening_depth;
                    $sign                                    = -1;
                }
                elsif ( $token eq '?' ) {
                    $self->[_K_opening_ternary_]->{$seqno} = @{$rLL};
                }
                elsif ( $token eq ':' ) {
                    $sign = -1;
                    $self->[_K_closing_ternary_]->{$seqno} = @{$rLL};
                }

                # The only sequenced types output by the tokenizer are
                # the opening & closing containers and the ternary
                # types. So we would only get here if the tokenizer has
                # been changed to mark some other tokens with sequence
                # numbers, or if an error has been introduced in a
                # hash such as %is_opening_container
                else {
                    DEVEL_MODE && Fault(<<EOM);
Unexpected sequenced token '$token' of type '$rtoken_type->[$j]', sequence=$seqno arrived from tokenizer.
Expecting only opening or closing container tokens or ternary tokens with sequence numbers.
EOM
                }

                if ( $sign > 0 ) {
                    $self->[_Iss_opening_]->[$seqno] = @{$rSS};

                    # For efficiency, we find the maximum level of
                    # opening tokens of any type.  The actual maximum
                    # level will be that of their contents which is 1
                    # greater.  That will be fixed in sub
                    # 'finish_formatting'.
                    my $level = $rlevels->[$j];
                    if ( $level > $self->[_maximum_level_] ) {
                        $self->[_maximum_level_]         = $level;
                        $self->[_maximum_level_at_line_] = $line_index + 1;
                    }
                }
                else { $self->[_Iss_closing_]->[$seqno] = @{$rSS} }
                push @{$rSS}, $sign * $seqno;

            }

            # Here we are storing the first five variables per token. The
            # remaining token variables will be added later as follows:
            #  _TOKEN_LENGTH_      is added by sub store_token
            #  _CUMULATIVE_LENGTH_ is added by sub store_token
            #  _KNEXT_SEQ_ITEM_    is added by sub respace_post_loop_ops
            #  _CI_LEVEL_          is added by sub set_ci
            # So all token variables are available for use after sub set_ci.

            my @tokary;

            $tokary[_TOKEN_]         = $token;
            $tokary[_TYPE_]          = $rtoken_type->[$j];
            $tokary[_TYPE_SEQUENCE_] = $seqno;
            $tokary[_LEVEL_]         = $rlevels->[$j];
            $tokary[_LINE_INDEX_]    = $line_index;

            push @{$rLL}, \@tokary;

        } ## end token loop

        # Need to remember if we can trim the input line
        $line_of_tokens->{_ended_in_blank_token} = $rtoken_type->[$jmax] eq 'b';

        # Values needed by Logger
        $line_of_tokens->{_level_0}    = $rlevels->[0];
        $line_of_tokens->{_ci_level_0} = 0;    # sub set_ci will fix this
        $line_of_tokens->{_nesting_blocks_0} =
          $line_of_tokens_old->{_nesting_blocks_0};
        $line_of_tokens->{_nesting_tokens_0} =
          $line_of_tokens_old->{_nesting_tokens_0};

        return;

    } ## end sub write_line_inner_loop

} ## end closure write_line

#############################################
# CODE SECTION 5: Pre-process the entire file
#############################################

sub finish_formatting {

    my ( $self, $severe_error ) = @_;

    # The file has been tokenized and is ready to be formatted.
    # All of the relevant data is stored in $self, ready to go.

    # Returns:
    #   true if input file was copied verbatim due to errors
    #   false otherwise

    # Some of the code in sub break_lists is not robust enough to process code
    # with arbitrary brace errors. The simplest fix is to just return the file
    # verbatim if there are brace errors.  This fixes issue c160.
    $severe_error ||= get_saw_brace_error();

    # Check the maximum level. If it is extremely large we will give up and
    # output the file verbatim.  Note that the actual maximum level is 1
    # greater than the saved value, so we fix that here.
    $self->[_maximum_level_] += 1;
    my $maximum_level       = $self->[_maximum_level_];
    my $maximum_table_index = $#maximum_line_length_at_level;
    if ( !$severe_error && $maximum_level >= $maximum_table_index ) {
        $severe_error ||= 1;
        Warn(<<EOM);
The maximum indentation level, $maximum_level, exceeds the builtin limit of $maximum_table_index.
Something may be wrong; formatting will be skipped.
EOM
    }

    # Dump any requested block summary data
    if ( $rOpts->{'dump-block-summary'} ) {
        if ($severe_error) { Exit(1) }
        $self->dump_block_summary();
        Exit(0);
    }

    # output file verbatim if severe error or no formatting requested
    if ( $severe_error || $rOpts->{notidy} ) {
        $self->dump_verbatim();
        $self->wrapup($severe_error);
        return 1;
    }

    # Update the 'save_logfile' flag based to include any tokenization errors.
    # We can save time by skipping logfile calls if it is not going to be saved.
    my $logger_object = $self->[_logger_object_];
    if ($logger_object) {
        my $save_logfile = $logger_object->get_save_logfile();
        $self->[_save_logfile_] = $save_logfile;
        my $file_writer_object = $self->[_file_writer_object_];
        $file_writer_object->set_save_logfile($save_logfile);
    }

    {
        my $rix_side_comments = $self->set_CODE_type();

        $self->find_non_indenting_braces($rix_side_comments);

        # Handle any requested side comment deletions. It is easier to get
        # this done here rather than farther down the pipeline because IO
        # lines take a different route, and because lines with deleted HSC
        # become BL lines.  We have already handled any tee requests in sub
        # getline, so it is safe to delete side comments now.
        $self->delete_side_comments($rix_side_comments)
          if ( $rOpts_delete_side_comments
            || $rOpts_delete_closing_side_comments );
    }

    # Verify that the line hash does not have any unknown keys.
    $self->check_line_hashes() if (DEVEL_MODE);

    {
        # Make a pass through all tokens, adding or deleting any whitespace as
        # required.  Also make any other changes, such as adding semicolons.
        # All token changes must be made here so that the token data structure
        # remains fixed for the rest of this iteration.
        my ( $error, $rqw_lines ) = $self->respace_tokens();
        if ($error) {
            $self->dump_verbatim();
            $self->wrapup();
            return 1;
        }

        # sub 'set_ci' is called after sub respace to allow use of type counts
        # Token variable _CI_LEVEL_ is only defined after this call
        $self->set_ci();

        $self->find_multiline_qw($rqw_lines);
    }

    $self->examine_vertical_tightness_flags();

    $self->set_excluded_lp_containers();

    $self->keep_old_line_breaks();

    # Implement any welding needed for the -wn or -cb options
    $self->weld_containers();

    # Collect info needed to implement the -xlp style
    $self->xlp_collapsed_lengths()
      if ( $rOpts_line_up_parentheses && $rOpts_extended_line_up_parentheses );

    # Locate small nested blocks which should not be broken
    $self->mark_short_nested_blocks();

    $self->special_indentation_adjustments();

    # Verify that the main token array looks OK.  If this ever causes a fault
    # then place similar checks before the sub calls above to localize the
    # problem.
    $self->check_rLL("Before 'process_all_lines'") if (DEVEL_MODE);

    # Finishes formatting and write the result to the line sink.
    # Eventually this call should just change the 'rlines' data according to the
    # new line breaks and then return so that we can do an internal iteration
    # before continuing with the next stages of formatting.
    $self->process_all_lines();

    # A final routine to tie up any loose ends
    $self->wrapup();
    return;
} ## end sub finish_formatting

my %is_loop_type;

BEGIN {
    my @q = qw( for foreach while do until );
    @{is_loop_type}{@q} = (1) x scalar(@q);
}

sub find_level_info {

    # Find level ranges and total variations of all code blocks in this file.

    # Returns:
    #   ref to hash with block info, with seqno as key (see below)

    my ($self) = @_;

    # The array _rSS_ has the complete container tree for this file.
    my $rSS = $self->[_rSS_];

    # We will be ignoring everything except code block containers
    my $rblock_type_of_seqno = $self->[_rblock_type_of_seqno_];

    my @stack;
    my %level_info;

    # TREE_LOOP:
    foreach my $sseq ( @{$rSS} ) {
        my $stack_depth = @stack;
        my $seq_next    = $sseq > 0 ? $sseq : -$sseq;

        next if ( !$rblock_type_of_seqno->{$seq_next} );
        if ( $sseq > 0 ) {

            # STACK_LOOP:
            my $item;
            foreach my $seq (@stack) {
                $item = $level_info{$seq};
                if ( $item->{maximum_depth} < $stack_depth ) {
                    $item->{maximum_depth} = $stack_depth;
                }
                $item->{block_count}++;
            } ## end STACK LOOP

            push @stack, $seq_next;
            my $block_type = $rblock_type_of_seqno->{$seq_next};

            # If this block is a loop nested within a loop, then we
            # will mark it as an 'inner_loop'. This is a useful
            # complexity measure.
            my $is_inner_loop = 0;
            if ( $is_loop_type{$block_type} && defined($item) ) {
                $is_inner_loop = $is_loop_type{ $item->{block_type} };
            }

            $level_info{$seq_next} = {
                starting_depth => $stack_depth,
                maximum_depth  => $stack_depth,
                block_count    => 1,
                block_type     => $block_type,
                is_inner_loop  => $is_inner_loop,
            };
        }
        else {
            my $seq_test = pop @stack;

            # error check
            if ( $seq_test != $seq_next ) {

                # Shouldn't happen - the $rSS array must have an error
                DEVEL_MODE && Fault("stack error finding total depths\n");

                %level_info = ();
                last;
            }
        }
    } ## end TREE_LOOP
    return \%level_info;
} ## end sub find_level_info

sub find_loop_label {

    my ( $self, $seqno ) = @_;

    # Given:
    #   $seqno = sequence number of a block of code for a loop
    # Return:
    #   $label = the loop label text, if any, or an empty string

    my $rLL                 = $self->[_rLL_];
    my $rlines              = $self->[_rlines_];
    my $K_opening_container = $self->[_K_opening_container_];

    my $label     = EMPTY_STRING;
    my $K_opening = $K_opening_container->{$seqno};

    # backup to the line with the opening paren, if any, in case the
    # keyword is on a different line
    my $Kp = $self->K_previous_code($K_opening);
    return $label unless ( defined($Kp) );
    if ( $rLL->[$Kp]->[_TOKEN_] eq ')' ) {
        $seqno     = $rLL->[$Kp]->[_TYPE_SEQUENCE_];
        $K_opening = $K_opening_container->{$seqno};
    }

    return $label unless ( defined($K_opening) );
    my $lx_open = $rLL->[$K_opening]->[_LINE_INDEX_];

    # look for a label within a few lines; allow a couple of blank lines
    foreach my $lx ( reverse( $lx_open - 3 .. $lx_open ) ) {
        last if ( $lx < 0 );
        my $line_of_tokens = $rlines->[$lx];
        my $line_type      = $line_of_tokens->{_line_type};

        # stop search on a non-code line
        last if ( $line_type ne 'CODE' );

        my $rK_range = $line_of_tokens->{_rK_range};
        my ( $Kfirst, $Klast ) = @{$rK_range};

        # skip a blank line
        next if ( !defined($Kfirst) );

        # check for a lable
        if ( $rLL->[$Kfirst]->[_TYPE_] eq 'J' ) {
            $label = $rLL->[$Kfirst]->[_TOKEN_];
            last;
        }

        # quit the search if we are above the starting line
        last if ( $lx < $lx_open );
    }

    return $label;
} ## end sub find_loop_label

{    ## closure find_mccabe_count
    my %is_mccabe_logic_keyword;
    my %is_mccabe_logic_operator;

    BEGIN {
        my @q = (qw( && || ||= &&= ? <<= >>= ));
        @is_mccabe_logic_operator{@q} = (1) x scalar(@q);

        @q = (qw( and or xor if else elsif unless until while for foreach ));
        @is_mccabe_logic_keyword{@q} = (1) x scalar(@q);
    } ## end BEGIN

    sub find_mccabe_count {
        my ($self) = @_;

        # Find the cumulative mccabe count to each token
        # Return '$rmccabe_count_sum' = ref to array with cumulative
        #   mccabe count to each token $K

        # NOTE: This sub currently follows the definitions in Perl::Critic

        my $rmccabe_count_sum;
        my $rLL    = $self->[_rLL_];
        my $count  = 0;
        my $Klimit = $self->[_Klimit_];
        foreach my $KK ( 0 .. $Klimit ) {
            $rmccabe_count_sum->{$KK} = $count;
            my $type = $rLL->[$KK]->[_TYPE_];
            if ( $type eq 'k' ) {
                my $token = $rLL->[$KK]->[_TOKEN_];
                if ( $is_mccabe_logic_keyword{$token} ) { $count++ }
            }
            else {
                if ( $is_mccabe_logic_operator{$type} ) {
                    $count++;
                }
            }
        }
        $rmccabe_count_sum->{ $Klimit + 1 } = $count;
        return $rmccabe_count_sum;
    } ## end sub find_mccabe_count
} ## end closure find_mccabe_count

sub find_code_line_count {
    my ($self) = @_;

    # Find the cumulative number of lines of code, excluding blanks,
    # comments and pod.
    # Return '$rcode_line_count' = ref to array with cumulative
    #   code line count for each input line number.

    my $rcode_line_count;
    my $rLL             = $self->[_rLL_];
    my $rlines          = $self->[_rlines_];
    my $ix_line         = -1;
    my $code_line_count = 0;

    # loop over all lines
    foreach my $line_of_tokens ( @{$rlines} ) {
        $ix_line++;

        # what type of line?
        my $line_type = $line_of_tokens->{_line_type};

        # if 'CODE' it must be non-blank and non-comment
        if ( $line_type eq 'CODE' ) {
            my $rK_range = $line_of_tokens->{_rK_range};
            my ( $Kfirst, $Klast ) = @{$rK_range};

            if ( defined($Kfirst) ) {

                # it is non-blank
                my $jmax = defined($Kfirst) ? $Klast - $Kfirst : -1;
                if ( $jmax > 0 || $rLL->[$Klast]->[_TYPE_] ne '#' ) {

                    # ok, it is a non-comment
                    $code_line_count++;
                }
            }
        }

        # Count all other special line types except pod;
        # For a list of line types see sub 'process_all_lines'
        else {
            if ( $line_type !~ /^POD/ ) { $code_line_count++ }
        }

        # Store the cumulative count using the input line index
        $rcode_line_count->[$ix_line] = $code_line_count;
    }
    return $rcode_line_count;
} ## end sub find_code_line_count

sub find_selected_packages {

    my ( $self, $rdump_block_types ) = @_;

    # returns a list of all selected package statements in a file
    my @package_list;

    if (   !$rdump_block_types->{'*'}
        && !$rdump_block_types->{'package'}
        && !$rdump_block_types->{'class'} )
    {
        return \@package_list;
    }

    my $rLL    = $self->[_rLL_];
    my $Klimit = $self->[_Klimit_];
    my $rlines = $self->[_rlines_];

    my $K_closing_container = $self->[_K_closing_container_];
    my @package_sweep;
    foreach my $KK ( 0 .. $Klimit ) {
        my $item = $rLL->[$KK];
        my $type = $item->[_TYPE_];

        # fix for c250: package type has changed from 'i' to 'P'
        next if ( $type ne 'P' );

        my $token = $item->[_TOKEN_];
        if (   substr( $token, 0, 7 ) eq 'package' && $token =~ /^package\s/
            || substr( $token, 0, 5 ) eq 'class' && $token =~ /^class\s/ )
        {

            $token =~ s/\s+/ /g;
            my ( $keyword, $name ) = split /\s+/, $token, 2;

            my $lx_start     = $item->[_LINE_INDEX_];
            my $level        = $item->[_LEVEL_];
            my $parent_seqno = $self->parent_seqno_by_K($KK);

            # Skip a class BLOCK because it will be handled as a block
            if ( $keyword eq 'class' ) {
                my $line_of_tokens = $rlines->[$lx_start];
                my $rK_range       = $line_of_tokens->{_rK_range};
                my ( $K_first, $K_last ) = @{$rK_range};
                if ( $rLL->[$K_last]->[_TYPE_] eq '#' ) {
                    $K_last = $self->K_previous_code($K_last);
                }
                if ( defined($K_last) ) {
                    my $seqno_class = $rLL->[$K_last]->[_TYPE_SEQUENCE_];
                    my $block_type_next =
                      $self->[_rblock_type_of_seqno_]->{$seqno_class};

                    # these block types are currently marked 'package'
                    # but may be 'class' in the future, so allow both.
                    if ( defined($block_type_next)
                        && $block_type_next =~ /^(class|package)\b/ )
                    {
                        next;
                    }
                }
            }

            my $K_closing = $Klimit;
            if ( $parent_seqno != SEQ_ROOT ) {
                my $Kc = $K_closing_container->{$parent_seqno};
                if ( defined($Kc) ) {
                    $K_closing = $Kc;
                }
            }

            # This package ends any previous package at this level
            if ( defined( my $ix = $package_sweep[$level] ) ) {
                my $rpk = $package_list[$ix];
                my $Kc  = $rpk->{K_closing};
                if ( $Kc > $KK ) {
                    $rpk->{K_closing} = $KK - 1;
                }
            }
            $package_sweep[$level] = @package_list;

            # max_change and block_count are not currently reported 'package'
            push @package_list,
              {
                line_start  => $lx_start + 1,
                K_opening   => $KK,
                K_closing   => $Klimit,
                name        => $name,
                type        => $keyword,
                level       => $level,
                max_change  => 0,
                block_count => 0,
              };
        }
    }

    return \@package_list;
} ## end sub find_selected_packages

sub find_selected_blocks {

    my ( $self, $rdump_block_types ) = @_;

    # Find blocks needed for --dump-block-summary
    # Returns:
    #  $rslected_blocks = ref to a list of information on the selected blocks

    my $rLL                  = $self->[_rLL_];
    my $rlines               = $self->[_rlines_];
    my $rblock_type_of_seqno = $self->[_rblock_type_of_seqno_];
    my $K_opening_container  = $self->[_K_opening_container_];
    my $K_closing_container  = $self->[_K_closing_container_];
    my $ris_asub_block       = $self->[_ris_asub_block_];
    my $ris_sub_block        = $self->[_ris_sub_block_];

    my $dump_all_types = $rdump_block_types->{'*'};

    # Get level variation info for code blocks
    my $rlevel_info = $self->find_level_info();

    my @selected_blocks;

    #---------------------------------------------------
    # BEGIN loop over all blocks to find selected blocks
    #---------------------------------------------------
    foreach my $seqno ( keys %{$rblock_type_of_seqno} ) {

        my $type;
        my $name       = EMPTY_STRING;
        my $block_type = $rblock_type_of_seqno->{$seqno};
        my $K_opening  = $K_opening_container->{$seqno};
        my $K_closing  = $K_closing_container->{$seqno};
        my $level      = $rLL->[$K_opening]->[_LEVEL_];

        my $lx_open        = $rLL->[$K_opening]->[_LINE_INDEX_];
        my $line_of_tokens = $rlines->[$lx_open];
        my $rK_range       = $line_of_tokens->{_rK_range};
        my ( $Kfirst, $Klast ) = @{$rK_range};
        if ( !defined($Kfirst) || !defined($Klast) || $Kfirst > $K_opening ) {
            my $line_type = $line_of_tokens->{_line_type};

            # shouldn't happen
            my $CODE_type = $line_of_tokens->{_code_type};
            DEVEL_MODE && Fault(<<EOM);
unexpected line_type=$line_type at line $lx_open, code type=$CODE_type
EOM
            next;
        }

        my ( $max_change, $block_count, $inner_loop_plus ) =
          ( 0, 0, EMPTY_STRING );
        my $item = $rlevel_info->{$seqno};
        if ( defined($item) ) {
            my $starting_depth = $item->{starting_depth};
            my $maximum_depth  = $item->{maximum_depth};
            $block_count = $item->{block_count};
            $max_change  = $maximum_depth - $starting_depth + 1;

            # this is a '+' character if this block is an inner loops
            $inner_loop_plus = $item->{is_inner_loop} ? '+' : EMPTY_STRING;
        }

        # Skip closures unless type 'closure' is explicitly requested
        if ( ( $block_type eq '}' || $block_type eq ';' )
            && $rdump_block_types->{'closure'} )
        {
            $type = 'closure';
        }

        # Both 'sub' and 'asub' select an anonymous sub.
        # This allows anonymous subs to be explicitely selected
        elsif (
            $ris_asub_block->{$seqno}
            && (   $dump_all_types
                || $rdump_block_types->{'sub'}
                || $rdump_block_types->{'asub'} )
          )
        {
            $type = 'asub';

            # Look back to try to find some kind of name, such as
            #   my $var = sub {        - var is type 'i'
            #       var => sub {       - var is type 'w'
            #      -var => sub {       - var is type 'w'
            #     'var' => sub {       - var is type 'Q'
            my ( $saw_equals, $saw_fat_comma, $blank_count );
            foreach my $KK ( reverse( $Kfirst .. $K_opening - 1 ) ) {
                my $token_type = $rLL->[$KK]->[_TYPE_];
                if ( $token_type eq 'b' )  { $blank_count++;   next }
                if ( $token_type eq '=>' ) { $saw_fat_comma++; next }
                if ( $token_type eq '=' )  { $saw_equals++;    next }
                if ( $token_type eq 'i' && $saw_equals
                    || ( $token_type eq 'w' || $token_type eq 'Q' )
                    && $saw_fat_comma )
                {
                    $name = $rLL->[$KK]->[_TOKEN_];
                    last;
                }
            }
        }
        elsif ( $ris_sub_block->{$seqno}
            && ( $dump_all_types || $rdump_block_types->{'sub'} ) )
        {
            $type = 'sub';

            # what we want:
            #      $block_type               $name
            # 'sub setidentifier($)'    => 'setidentifier'
            # 'method setidentifier($)' => 'setidentifier'
            my @parts = split /\s+/, $block_type;
            $name = $parts[1];
            $name =~ s/\(.*$//;
        }
        elsif (
            $block_type =~ /^(package|class)\b/
            && (   $dump_all_types
                || $rdump_block_types->{'package'}
                || $rdump_block_types->{'class'} )
          )
        {
            $type = 'class';
            my @parts = split /\s+/, $block_type;
            $name = $parts[1];
            $name =~ s/\(.*$//;
        }
        elsif (
            $is_loop_type{$block_type}
            && (   $dump_all_types
                || $rdump_block_types->{$block_type}
                || $rdump_block_types->{ $block_type . $inner_loop_plus }
                || $rdump_block_types->{$inner_loop_plus} )
          )
        {
            $type = $block_type . $inner_loop_plus;
        }
        elsif ( $dump_all_types || $rdump_block_types->{$block_type} ) {
            if ( $is_loop_type{$block_type} ) {
                $name = $self->find_loop_label($seqno);
            }
            $type = $block_type;
        }
        else {
            next;
        }

        push @selected_blocks,
          {
            K_opening   => $K_opening,
            K_closing   => $K_closing,
            line_start  => $lx_open + 1,
            name        => $name,
            type        => $type,
            level       => $level,
            max_change  => $max_change,
            block_count => $block_count,
          };
    }    ## END loop to get info for selected blocks
    return \@selected_blocks;
} ## end sub find_selected_blocks

sub dump_block_summary {
    my ($self) = @_;

    # Dump information about selected code blocks to STDOUT
    # This sub is called when
    #   --dump-block-summary (-dbs) is set.

    # The following controls are available:
    #  --dump-block-types=s (-dbt=s), where s is a list of block types
    #    (if else elsif for foreach while do ... sub) ; default is 'sub'
    #  --dump-block-minimum-lines=n (-dbml=n), where n is the minimum
    #    number of lines for a block to be included; default is 20.

    my $rOpts_dump_block_types = $rOpts->{'dump-block-types'};
    if ( !defined($rOpts_dump_block_types) ) { $rOpts_dump_block_types = 'sub' }
    $rOpts_dump_block_types =~ s/^\s+//;
    $rOpts_dump_block_types =~ s/\s+$//;
    my @list = split /\s+/, $rOpts_dump_block_types;
    my %dump_block_types;
    @{dump_block_types}{@list} = (1) x scalar(@list);

    # Get block info
    my $rselected_blocks = $self->find_selected_blocks( \%dump_block_types );

    # Get package info
    my $rpackage_list = $self->find_selected_packages( \%dump_block_types );

    return if ( !@{$rselected_blocks} && !@{$rpackage_list} );

    my $input_stream_name = get_input_stream_name();

    # Get code line count
    my $rcode_line_count = $self->find_code_line_count();

    # Get mccabe count
    my $rmccabe_count_sum = $self->find_mccabe_count();

    my $rOpts_dump_block_minimum_lines = $rOpts->{'dump-block-minimum-lines'};
    if ( !defined($rOpts_dump_block_minimum_lines) ) {
        $rOpts_dump_block_minimum_lines = 20;
    }

    my $rLL = $self->[_rLL_];

    # merge blocks and packages, add various counts, filter and print to STDOUT
    my $routput_lines = [];
    foreach my $item ( @{$rselected_blocks}, @{$rpackage_list} ) {

        my $K_opening = $item->{K_opening};
        my $K_closing = $item->{K_closing};

        # define total number of lines
        my $lx_open    = $rLL->[$K_opening]->[_LINE_INDEX_];
        my $lx_close   = $rLL->[$K_closing]->[_LINE_INDEX_];
        my $line_count = $lx_close - $lx_open + 1;

        # define total number of lines of code excluding blanks, comments, pod
        my $code_lines_open  = $rcode_line_count->[$lx_open];
        my $code_lines_close = $rcode_line_count->[$lx_close];
        my $code_lines       = 0;
        if ( defined($code_lines_open) && defined($code_lines_close) ) {
            $code_lines = $code_lines_close - $code_lines_open + 1;
        }

        # filter out blocks below the selected code line limit
        if ( $code_lines < $rOpts_dump_block_minimum_lines ) {
            next;
        }

        # add mccabe_count for this block
        my $mccabe_closing = $rmccabe_count_sum->{ $K_closing + 1 };
        my $mccabe_opening = $rmccabe_count_sum->{$K_opening};
        my $mccabe_count   = 1;    # add 1 to match Perl::Critic
        if ( defined($mccabe_opening) && defined($mccabe_closing) ) {
            $mccabe_count += $mccabe_closing - $mccabe_opening;
        }

        # Store the final set of print variables
        push @{$routput_lines}, [

            $input_stream_name,
            $item->{line_start},
            $line_count,
            $code_lines,
            $item->{type},
            $item->{name},
            $item->{level},
            $item->{max_change},
            $item->{block_count},
            $mccabe_count,

        ];
    }

    return unless @{$routput_lines};

    # Sort blocks and packages on starting line number
    my @sorted_lines = sort { $a->[1] <=> $b->[1] } @{$routput_lines};

    print {*STDOUT}
"file,line,line_count,code_lines,type,name,level,max_change,block_count,mccabe_count\n";

    foreach my $rline_vars (@sorted_lines) {
        my $line = join( ",", @{$rline_vars} ) . "\n";
        print {*STDOUT} $line;
    }
    return;
} ## end sub dump_block_summary

sub set_ci {

    my ($self) = @_;

    # Set the basic continuation indentation (ci) for all tokens.
    # This is a replacement for the values previously computed in
    # sub Perl::Tidy::Tokenizer::tokenizer_wrapup. In most cases it
    # produces identical results, but in a few cases it is an improvement.

    use constant DEBUG_SET_CI => 0;

    # This turns on an optional piece of logic which makes the new and
    # old computations of ci agree.  It has almost no effect on actual
    # programs but is useful for testing.
    use constant SET_CI_OPTION_0 => 1;

    # This is slightly different from the hash in in break_lists
    # with a similar name (removed '?' and ':' to fix t007 and others)
    my %is_logical_container_for_ci;
    my @q = qw# if elsif unless while and or err not && | || ! #;
    @is_logical_container_for_ci{@q} = (1) x scalar(@q);

    # This is slightly different from a tokenizer hash with a similar name:
    my %is_container_label_type_for_ci;
    @q = qw# k && | || ? : ! #;
    @is_container_label_type_for_ci{@q} = (1) x scalar(@q);

    # Undo ci of closing list paren followed by these binary operators:
    # - initially defined for issue t027, then
    # - added '=' for t015
    # - added '=~' for 'locale.in'
    # - added '<=>' for 'corelist.in'
    # Note:
    #   See @value_requestor_type for more that might be included
    #   See also @is_binary_type
    my %bin_op_type;
    @q = qw# . ** -> + - / * = != ^ < > % >= <= =~ !~ <=> x #;
    @bin_op_type{@q} = (1) x scalar(@q);

    my %is_list_end_type;
    @q = qw( ; { } );
    push @q, ',';
    @is_list_end_type{@q} = (1) x scalar(@q);

    my $rLL    = $self->[_rLL_];
    my $Klimit = $self->[_Klimit_];
    return unless defined($Klimit);

    my $token        = ';';
    my $type         = ';';
    my $last_token   = $token;
    my $last_type    = $type;
    my $ci_last      = 0;
    my $ci_next      = 0;
    my $ci_next_next = 1;
    my $rstack       = [];

    my $seq_root = SEQ_ROOT;
    my $rparent  = {
        _seqno           => $seq_root,
        _ci_open         => 0,
        _ci_open_next    => 0,
        _ci_close        => 0,
        _ci_close_next   => 0,
        _container_type  => 'Block',
        _ci_next_next    => $ci_next_next,
        _comma_count     => 0,
        _semicolon_count => 0,
        _Kc              => undef,
    };

    # Debug stuff
    my @debug_lines;
    my %saw_ci_diff;

    my $rblock_type_of_seqno = $self->[_rblock_type_of_seqno_];
    my $ris_sub_block        = $self->[_ris_sub_block_];
    my $ris_asub_block       = $self->[_ris_asub_block_];
    my $K_opening_container  = $self->[_K_opening_container_];
    my $K_closing_container  = $self->[_K_closing_container_];
    my $K_opening_ternary    = $self->[_K_opening_ternary_];
    my $K_closing_ternary    = $self->[_K_closing_ternary_];
    my $rlines               = $self->[_rlines_];
    my $rtype_count_by_seqno = $self->[_rtype_count_by_seqno_];

    my $want_break_before_comma = $want_break_before{','};

    my $map_block_follows = sub {

        # return true if a sort/map/etc block follows the closing brace
        # of container $seqno
        my ($seqno) = @_;
        my $Kc = $K_closing_container->{$seqno};
        return unless defined($Kc);
        my $Kcn = $self->K_next_code($Kc);
        return unless defined($Kcn);
        my $seqno_n = $rLL->[$Kcn]->[_TYPE_SEQUENCE_];

        #return if ( defined($seqno_n) );
        return if ($seqno_n);
        my $Knn = $self->K_next_code($Kcn);
        return unless defined($Knn);
        my $seqno_nn = $rLL->[$Knn]->[_TYPE_SEQUENCE_];
        return unless ($seqno_nn);
        my $K_nno = $K_opening_container->{$seqno_nn};
        return unless $K_nno && $K_nno == $Knn;
        my $block_type = $rblock_type_of_seqno->{$seqno_nn};

        if ($block_type) {
            return $is_block_with_ci{$block_type};
        }
        return;
    };

    my $redo_preceding_comment_ci = sub {

        # We need to reset the ci of the previous comment(s)
        my ( $K, $ci ) = @_;
        my $Km = $self->K_previous_code($K);
        return if ( !defined($Km) );
        foreach my $Kt ( $Km + 1 .. $K - 1 ) {
            if ( $rLL->[$Kt]->[_TYPE_] eq '#' ) {
                $rLL->[$Kt]->[_CI_LEVEL_] = $ci;
            }
        }
        return;
    };

    # Definitions of the sequence of ci_values being maintained:
    # $ci_last      = the ci value of the previous non-blank, non-comment token
    # $ci_this      = the ci value to be stored for this token at index $KK
    # $ci_next      = the normal ci for the next token, set by the previous tok
    # $ci_next_next = the normal next value of $ci_next in this container

    #--------------------------
    # Main loop over all tokens
    #--------------------------
    my $KK = -1;
    foreach my $rtoken_K ( @{$rLL} ) {

        $KK++;
        $type = $rtoken_K->[_TYPE_];

        #------------------
        # Section 1. Blanks
        #------------------
        if ( $type eq 'b' ) {

            $rtoken_K->[_CI_LEVEL_] = $ci_next;

            # 'next' to avoid saving last_ values for blanks and commas
            next;
        }

        #--------------------
        # Section 2. Comments
        #--------------------
        if ( $type eq '#' ) {

            my $ci_this = $ci_next;

            # If at '#' in ternary before a ? or :, use that level to make
            # the comment line up with the next ? or : line.  (see c202/t052)
            # i.e. if a nested ? follows, we increase the '#' level by 1, and
            # if a nested : follows, we decrease the '#' level by 1.
            # This is the only place where this sub changes a _LEVEL_ value.
            my $Kn;
            my $parent_container_type = $rparent->{_container_type};
            if ( $parent_container_type eq 'Ternary' ) {
                $Kn = $self->K_next_code($KK);
                if ($Kn) {
                    my $type_kn = $rLL->[$Kn]->[_TYPE_];
                    if ( $is_ternary{$type_kn} ) {
                        my $level_KK = $rLL->[$KK]->[_LEVEL_];
                        my $level_Kn = $rLL->[$Kn]->[_LEVEL_];
                        $rLL->[$KK]->[_LEVEL_] = $rLL->[$Kn]->[_LEVEL_];

                        # and use the ci of a terminating ':'
                        if ( $Kn == $rparent->{_Kc} ) {
                            $ci_this = $rparent->{_ci_close};
                        }
                    }
                }
            }

            # Undo ci for a block comment followed by a closing token or , or ;
            # provided that the parent container:
            # - ends without ci, or
            # - starts ci=0 and is a comma list or this follows a closing type
            # - has a level jump
            if (
                $ci_this
                && (
                    !$rparent->{_ci_close}
                    || (
                        !$rparent->{_ci_open_next}
                        && ( ( $rparent->{_comma_count} || $last_type eq ',' )
                            || $is_closing_type{$last_type} )
                    )
                )
              )
            {
                # Be sure this is a block comment
                my $lx       = $rtoken_K->[_LINE_INDEX_];
                my $rK_range = $rlines->[$lx]->{_rK_range};
                my $Kfirst;
                if ($rK_range) { $Kfirst = $rK_range->[0] }
                if ( defined($Kfirst) && $Kfirst == $KK ) {

                    # Look for trailing closing token
                    #    [ and possibly ',' or ';' ]
                    $Kn = $self->K_next_code($KK) if ( !$Kn );
                    my $Kc = $rparent->{_Kc};
                    if (
                           $Kn
                        && $Kc
                        && (
                            $Kn == $Kc

                            # only look for comma if -wbb=',' is set
                            # to minimize changes to existing formatting
                            || (   $rLL->[$Kn]->[_TYPE_] eq ','
                                && $want_break_before_comma
                                && $parent_container_type eq 'List' )

                            # do not look ahead for a bare ';' because
                            # it changes old formatting with little benefit.
##                          || (   $rLL->[$Kn]->[_TYPE_] eq ';'
##                                && $parent_container_type eq 'Block' )
                        )
                      )
                    {

                        # Be sure container has a level jump
                        my $level_KK = $rLL->[$KK]->[_LEVEL_];
                        my $level_Kc = $rLL->[$Kc]->[_LEVEL_];
                        if ( $level_Kc < $level_KK ) {
                            $ci_this = 0;
                        }
                    }
                }
            }

            $ci_next = $ci_this;
            $rtoken_K->[_CI_LEVEL_] = $ci_this;

            # 'next' to avoid saving last_ values for blanks and commas
            next;
        }

        #------------------------------------------------------------
        # Section 3. Continuing with non-blank and non-comment tokens
        #------------------------------------------------------------

        $token = $rtoken_K->[_TOKEN_];

        # Set ci values appropriate for most tokens:
        my $ci_this = $ci_next;
        $ci_next = $ci_next_next;

        # Now change these ci values as necessary for special cases...

        #----------------------------
        # Section 4. Container tokens
        #----------------------------
        if ( $rtoken_K->[_TYPE_SEQUENCE_] ) {

            my $seqno = $rtoken_K->[_TYPE_SEQUENCE_];

            #-------------------------------------
            # Section 4.1 Opening container tokens
            #-------------------------------------
            if ( $is_opening_sequence_token{$token} ) {

                my $level = $rtoken_K->[_LEVEL_];

                # Default ci values for the closing token, to be modified
                # as necessary:
                my $ci_close      = $ci_next;
                my $ci_close_next = $ci_next_next;

                my $Kc =
                    $type eq '?'
                  ? $K_closing_ternary->{$seqno}
                  : $K_closing_container->{$seqno};

                #  $Kn  = $self->K_next_nonblank($KK);
                my $Kn;
                if ( $KK < $Klimit ) {
                    $Kn = $KK + 1;
                    if ( $rLL->[$Kn]->[_TYPE_] eq 'b' && $Kn < $Klimit ) {
                        $Kn += 1;
                    }
                }

                #  $Kcn = $self->K_next_code($Kc);
                my $Kcn;
                if ( $Kc && $Kc < $Klimit ) {
                    $Kcn = $Kc + 1;
                    if ( $rLL->[$Kcn]->[_TYPE_] eq 'b' && $Kcn < $Klimit ) {
                        $Kcn += 1;
                    }
                    if ( $rLL->[$Kcn]->[_TYPE_] eq '#' ) {
                        $Kcn = $self->K_next_code($Kcn);
                    }
                }

                my $opening_level_jump =
                  $Kn ? $rLL->[$Kn]->[_LEVEL_] - $level : 0;

                # initialize ci_next_next to its standard value
                $ci_next_next = 1;

                # Default: ci of first item of list with level jump is same as
                # ci of first item of container
                if ( $opening_level_jump > 0 ) {
                    $ci_next = $rparent->{_ci_open_next};
                }

                my ( $comma_count, $semicolon_count );
                my $rtype_count = $rtype_count_by_seqno->{$seqno};
                if ($rtype_count) {
                    $comma_count     = $rtype_count->{','};
                    $semicolon_count = $rtype_count->{';'};

                    # Do not include a terminal semicolon in the count (the
                    # comma_count has already been corrected by respace_tokens)
                    # We only need to know if there are semicolons or not, so
                    # for speed we can just do this test if the count is 1.
                    if ( $semicolon_count && $semicolon_count == 1 ) {
                        my $Kcm = $self->K_previous_code($Kc);
                        if ( $rLL->[$Kcm]->[_TYPE_] eq ';' ) {
                            $semicolon_count--;
                        }
                    }
                }

                my $container_type;

                #-------------------------
                # Section 4.1.1 Code Block
                #-------------------------
                my $block_type = $rblock_type_of_seqno->{$seqno};
                if ($block_type) {
                    $container_type = 'Block';

                    # set default depending on block type
                    $ci_close = 0;

                    my $no_semicolon =
                         $is_block_without_semicolon{$block_type}
                      || $ris_sub_block->{$seqno}
                      || $last_type eq 'J';

                    if ( !$no_semicolon ) {

                        # Optional fix for block types sort/map/etc which use
                        # zero ci at terminal brace if previous keyword had
                        # zero ci.  This will cause sort/map/grep filter blocks
                        # to line up. Note that sub 'undo_ci' will also try to
                        # do this, so this is not a critical operation.
                        if ( $is_block_with_ci{$block_type} ) {
                            my $parent_seqno = $rparent->{_seqno};
                            my $rtype_count_p =
                              $rtype_count_by_seqno->{$parent_seqno};
                            if (

                                # only do this within containers
                                $parent_seqno != SEQ_ROOT

                                # only in containers without ',' and ';'
                                && !$rparent->{_comma_count}
                                && !$rparent->{_semicolon_count}

                                && $map_block_follows->($seqno)
                              )
                            {
                                if ($ci_last) {
                                    $ci_close = $ci_this;
                                }
                            }
                            else {
                                $ci_close = $ci_this;
                            }
                        }

                        # keep ci if certain operators follow (fix c202/t024)
                        if ( !$ci_close && $Kcn ) {
                            my $type_kcn  = $rLL->[$Kcn]->[_TYPE_];
                            my $token_kcn = $rLL->[$Kcn]->[_TOKEN_];
                            if (   $type_kcn =~ /^(\.|\&\&|\|\|)$/
                                || $type_kcn eq 'k' && $is_and_or{$token_kcn} )
                            {
                                $ci_close = $ci_this;
                            }
                        }
                    }

                    if ( $rparent->{_container_type} ne 'Ternary' ) {
                        $ci_this = 0;
                    }
                    $ci_next       = 0;
                    $ci_close_next = $ci_close;
                }

                #----------------------
                # Section 4.1.2 Ternary
                #----------------------
                elsif ( $type eq '?' ) {
                    $container_type = 'Ternary';
                    if ( $rparent->{_container_type} eq 'List'
                        && !$rparent->{_ci_open_next} )
                    {
                        $ci_this  = 0;
                        $ci_close = 0;
                    }

                    # redo ci of any preceding comments if necessary
                    # at an outermost ? (which has no level jump)
                    if ( !$opening_level_jump ) {
                        $redo_preceding_comment_ci->( $KK, $ci_this );
                    }
                }

                #-------------------------------
                # Section 4.1.3 Logical or List?
                #-------------------------------
                else {
                    my $is_logical = $is_container_label_type_for_ci{$last_type}
                      && $is_logical_container_for_ci{$last_token}

                      # Part 1 of optional patch to get agreement with previous
                      # ci This makes almost no difference in a typical program
                      # because we will seldom break within an array index.
                      || $type eq '[' && SET_CI_OPTION_0;

                    if ( !$is_logical && $token eq '(' ) {

                        # 'foreach' and 'for' paren contents are treated as
                        # logical except for C-style 'for'
                        if ( $last_type eq 'k' ) {
                            $is_logical ||= $last_token eq 'foreach';

                            # C-style 'for' container will be type 'List'
                            if ( $last_token eq 'for' ) {
                                $is_logical =
                                  !( $rtype_count && $rtype_count->{'f'} );
                            }
                        }

                        # Check for 'for' and 'foreach' loops with iterators
                        elsif ( $last_type eq 'i' && defined($Kcn) ) {
                            my $seqno_kcn = $rLL->[$Kcn]->[_TYPE_SEQUENCE_];
                            my $type_kcn  = $rLL->[$Kcn]->[_TOKEN_];
                            if ( $seqno_kcn && $type_kcn eq '{' ) {
                                my $block_type_kcn =
                                  $rblock_type_of_seqno->{$seqno_kcn};
                                $is_logical ||= $block_type_kcn
                                  && ( $block_type_kcn eq 'for'
                                    || $block_type_kcn eq 'foreach' );
                            }

                            # Search backwards for 'for'/'foreach' with
                            # iterator in case user is running from an editor
                            # and did not include the block (fixes case
                            # 'xci.in').
                            my $Km = $self->K_previous_code($KK);
                            foreach ( 0 .. 2 ) {
                                $Km = $self->K_previous_code($Km);
                                last unless defined($Km);
                                last unless $rLL->[$Km]->[_TYPE_] eq 'k';
                                my $tok = $rLL->[$Km]->[_TOKEN_];
                                next if $tok eq 'my';
                                $is_logical ||=
                                  ( $tok eq 'for' || $tok eq 'foreach' );
                                last;
                            }
                        }
                        elsif ( $last_token eq '(' ) {
                            $is_logical ||=
                              $rparent->{_container_type} eq 'Logical';
                        }
                        else {
                            ## ok - none of the above
                        }
                    }

                    #------------------------
                    # Section 4.1.3.1 Logical
                    #------------------------
                    if ($is_logical) {
                        $container_type = 'Logical';

                        # Pass ci though an '!'
                        if ( $last_type eq '!' ) { $ci_this = $ci_last }

                        $ci_next_next  = 0;
                        $ci_close_next = $ci_this;

                        # Part 2 of optional patch to get agreement with
                        # previous ci
                        if ( $type eq '[' && SET_CI_OPTION_0 ) {

                            $ci_next_next = $ci_this;

                            # Undo ci at a chain of indexes or hash keys
                            if ( $last_type eq '}' ) {
                                $ci_this = $ci_last;
                            }
                        }

                        if ($opening_level_jump) {
                            $ci_next = 0;
                        }
                    }

                    #---------------------
                    # Section 4.1.3.2 List
                    #---------------------
                    else {

                        # Here 'List' is a catchall for none of the above types
                        $container_type = 'List';

                        # lists in blocks ...
                        if ( $rparent->{_container_type} eq 'Block' ) {

                            # undo ci if another closing token follows
                            if ( defined($Kcn) ) {
                                my $closing_level_jump =
                                  $rLL->[$Kcn]->[_LEVEL_] - $level;
                                if ( $closing_level_jump < 0 ) {
                                    $ci_close = $ci_this;
                                }
                            }
                        }

                        # lists not in blocks ...
                        else {

                            if ( !$rparent->{_comma_count} ) {

                                $ci_close = $ci_this;

                                # undo ci at binary op after right paren if no
                                # commas in container; fixes t027, t028
                                if (   $ci_close_next != $ci_close
                                    && defined($Kcn)
                                    && $bin_op_type{ $rLL->[$Kcn]->[_TYPE_] } )
                                {
                                    $ci_close_next = $ci_close;
                                }
                            }

                            if ( $rparent->{_container_type} eq 'Ternary' ) {
                                $ci_next = 0;
                            }
                        }

                        # Undo ci at a chain of indexes or hash keys
                        if ( $token ne '(' && $last_type eq '}' ) {
                            $ci_this = $ci_close = $ci_last;
                        }
                    }
                }

                #---------------------------------------
                # Section 4.1.4 Store opening token info
                #---------------------------------------

                # Most closing tokens should align with their opening tokens.
                if (
                       $type eq '{'
                    && $token ne '('
                    && $is_list_end_type{$last_type}

                    # avoid asub blocks, which may have prototypes ending in '}'
                    && !$ris_asub_block->{$seqno}
                  )
                {
                    $ci_close = $ci_this;
                }

                # Closing ci must never be less than opening
                if ( $ci_close < $ci_this ) { $ci_close = $ci_this }

                push @{$rstack}, $rparent;
                $rparent = {
                    _seqno           => $seqno,
                    _container_type  => $container_type,
                    _ci_next_next    => $ci_next_next,
                    _ci_open         => $ci_this,
                    _ci_open_next    => $ci_next,
                    _ci_close        => $ci_close,
                    _ci_close_next   => $ci_close_next,
                    _comma_count     => $comma_count,
                    _semicolon_count => $semicolon_count,
                    _Kc              => $Kc,
                };
            }

            #-------------------------------------
            # Section 4.2 Closing container tokens
            #-------------------------------------
            else {

                my $seqno_test = $rparent->{_seqno};
                if ( $seqno_test ne $seqno ) {

                    # Shouldn't happen if we are processing balanced text.
                    # (Unbalanced text should go out verbatim)
                    DEVEL_MODE
                      && Fault("stack error: $seqno_test != $seqno\n");
                }

                # Use ci_this, ci_next values set by the matching opening token:
                $ci_this = $rparent->{_ci_close};
                $ci_next = $rparent->{_ci_close_next};
                my $ci_open_old = $rparent->{_ci_open};

                # Then pop the stack and use the parent ci_next_next value:
                if ( @{$rstack} ) {
                    $rparent      = pop @{$rstack};
                    $ci_next_next = $rparent->{_ci_next_next};
                }
                else {

                    # Shouldn't happen if we are processing balanced text.
                    DEVEL_MODE && Fault("empty stack - shouldn't happen\n");
                }

                # Fix: undo ci at a closing token followed by a closing token.
                # Goal is to keep formatting independent of the existence of a
                # trailing comma or semicolon.
                if ( $ci_this > 0 && !$ci_open_old && !$rparent->{_ci_close} ) {
                    my $Kc = $rparent->{_Kc};
                    my $Kn = $self->K_next_code($KK);
                    if ( $Kc && $Kn && $Kc == $Kn ) {
                        $ci_this = $ci_next = 0;
                    }
                }
            }
        }

        #---------------------------------
        # Section 5. Semicolons and Labels
        #---------------------------------
        # The next token after a ';' and label (type 'J') starts a new stmt
        # The ci after a C-style for ';' (type 'f') is handled similarly.
        elsif ( $type eq ';' || $type eq 'J' || $type eq 'f' ) {
            $ci_next = 0;
            if ( $is_closing_type{$last_type} ) { $ci_this = $ci_last }
        }

        #--------------------
        # Section 6. Keywords
        #--------------------
        # Undo ci after a format statement
        elsif ( $type eq 'k' ) {
            if ( substr( $token, 0, 6 ) eq 'format' ) {
                $ci_next = 0;
            }
        }

        #------------------
        # Section 7. Commas
        #------------------
        # A comma and the subsequent item normally have ci undone
        # unless ci has been set at a lower level
        elsif ( $type eq ',' ) {

            if ( $rparent->{_container_type} eq 'List' ) {
                $ci_this = $ci_next = $rparent->{_ci_open_next};
            }
        }

        #---------------------------------
        # Section 8. Hanging side comments
        #---------------------------------
        # Treat hanging side comments like blanks
        elsif ( $type eq 'q' && $token eq EMPTY_STRING ) {
            $ci_next = $ci_this;

            $rtoken_K->[_CI_LEVEL_] = $ci_this;

            # 'next' to avoid saving last_ values for blanks and commas
            next;
        }
        else {
            ## ok - not a special type for ci
        }

        # Save debug info if requested
        DEBUG_SET_CI && do {

            my $seqno = $rtoken_K->[_TYPE_SEQUENCE_];
            my $level = $rtoken_K->[_LEVEL_];
            my $ci    = $rtoken_K->[_CI_LEVEL_];
            if ( $ci > 1 ) { $ci = 1 }

            my $tok      = $token;
            my $last_tok = $last_token;
            $tok      =~ s/\t//g;
            $last_tok =~ s/\t//g;
            $tok = length($tok) > 3 ? substr( $tok, 0, 8 ) : $tok;
            $last_tok =
              length($last_tok) > 3 ? substr( $last_tok, 0, 8 ) : $last_tok;
            $tok      =~ s/["']//g;
            $last_tok =~ s/["']//g;
            my $block_type;
            $block_type = $rblock_type_of_seqno->{$seqno} if ($seqno);
            $block_type = EMPTY_STRING unless ($block_type);
            my $ptype = $rparent->{_container_type};
            my $pname = $ptype;

            my $error =
              $ci_this == $ci ? EMPTY_STRING : $type eq 'b' ? "error" : "ERROR";
            if ($error) { $saw_ci_diff{$KK} = 1 }

            my $lno = $rtoken_K->[_LINE_INDEX_] + 1;
            $debug_lines[$KK] = <<EOM;
$lno\t$ci\t$ci_this\t$ci_next\t$last_type\t$last_tok\t$type\t$tok\t$seqno\t$level\t$pname\t$block_type\t$error
EOM
        };

        #----------------------------------
        # Store the ci value for this token
        #----------------------------------
        $rtoken_K->[_CI_LEVEL_] = $ci_this;

        # Remember last nonblank, non-comment token info for the next pass
        $ci_last    = $ci_this;
        $last_token = $token;
        $last_type  = $type;

    }    ## End main loop over tokens

    #----------------------
    # Post-loop operations:
    #----------------------

    # if the logfile is saved, we need to save the leading ci of
    # each old line of code.
    if ( $self->[_save_logfile_] ) {
        foreach my $line_of_tokens ( @{$rlines} ) {
            my $line_type = $line_of_tokens->{_line_type};
            next if ( $line_type ne 'CODE' );
            my ( $Kfirst, $Klast ) = @{ $line_of_tokens->{_rK_range} };
            next if ( !defined($Kfirst) );
            $line_of_tokens->{_ci_level_0} = $rLL->[$Kfirst]->[_CI_LEVEL_];
        }
    }

    if (DEBUG_SET_CI) {
        my @output_lines;
        foreach my $KK ( 0 .. $Klimit ) {
            my $line = $debug_lines[$KK];
            if ($line) {
                my $Kp = $self->K_previous_code($KK);
                my $Kn = $self->K_next_code($KK);
                if (   DEBUG_SET_CI > 1
                    || $Kp && $saw_ci_diff{$Kp}
                    || $saw_ci_diff{$KK}
                    || $Kn && $saw_ci_diff{$Kn} )
                {
                    push @output_lines, $line;
                }
            }
        }
        if (@output_lines) {
            unshift @output_lines, <<EOM;
lno\tci\tci_this\tci_next\tlast_type\tlast_tok\ttype\ttok\tseqno\tlevel\tpname\tblock_type\terror?
EOM
            foreach my $line (@output_lines) {
                chomp $line;
                print {*STDOUT} $line, "\n";
            }
        }
    }

    return;
} ## end sub set_ci

sub set_CODE_type {
    my ($self) = @_;

    # Examine each line of code and set a flag '$CODE_type' to describe it.
    # Also return a list of lines with side comments.

    my $rLL    = $self->[_rLL_];
    my $rlines = $self->[_rlines_];

    my $rOpts_format_skipping_begin = $rOpts->{'format-skipping-begin'};
    my $rOpts_format_skipping_end   = $rOpts->{'format-skipping-end'};
    my $rOpts_static_block_comment_prefix =
      $rOpts->{'static-block-comment-prefix'};

    # Remember indexes of lines with side comments
    my @ix_side_comments;

    my $In_format_skipping_section = 0;
    my $Saw_VERSION_in_this_file   = 0;
    my $has_side_comment           = 0;
    my $last_line_had_side_comment = 0;
    my ( $Kfirst, $Klast );
    my $CODE_type;

    # Loop to set CODE_type

    # Possible CODE_types
    # 'VB'  = Verbatim - line goes out verbatim (a quote)
    # 'FS'  = Format Skipping - line goes out verbatim
    # 'BL'  = Blank Line
    # 'HSC' = Hanging Side Comment - fix this hanging side comment
    # 'SBCX'= Static Block Comment Without Leading Space
    # 'SBC' = Static Block Comment
    # 'BC'  = Block Comment - an ordinary full line comment
    # 'IO'  = Indent Only - line goes out unchanged except for indentation
    # 'NIN' = No Internal Newlines - line does not get broken
    # 'VER' = VERSION statement
    # ''    = ordinary line of code with no restrictions

    my $ix_line = -1;
    foreach my $line_of_tokens ( @{$rlines} ) {
        $ix_line++;
        my $line_type = $line_of_tokens->{_line_type};

        my $last_CODE_type = $CODE_type;
        $CODE_type = EMPTY_STRING;

        if ( $line_type ne 'CODE' ) {
            next;
        }

        my $input_line = $line_of_tokens->{_line_text};

        my $Klast_prev = $Klast;
        ( $Kfirst, $Klast ) = @{ $line_of_tokens->{_rK_range} };
        my $jmax = defined($Kfirst) ? $Klast - $Kfirst : -1;

        my $is_block_comment;
        if ( $jmax >= 0 && $rLL->[$Klast]->[_TYPE_] eq '#' ) {
            if   ( $jmax == 0 ) { $is_block_comment = 1; }
            else                { $has_side_comment = 1 }
        }

        # Write line verbatim if we are in a formatting skip section
        if ($In_format_skipping_section) {

            # Note: extra space appended to comment simplifies pattern matching
            if (
                $is_block_comment

                # optional fast pre-check
                && ( substr( $rLL->[$Kfirst]->[_TOKEN_], 0, 4 ) eq '#>>>'
                    || $rOpts_format_skipping_end )

                && ( $rLL->[$Kfirst]->[_TOKEN_] . SPACE ) =~
                /$format_skipping_pattern_end/
              )
            {
                $In_format_skipping_section = 0;
                my $input_line_no = $line_of_tokens->{_line_number};
                write_logfile_entry(
                    "Line $input_line_no: Exiting format-skipping section\n");
            }
            elsif (
                $is_block_comment

                # optional fast pre-check
                && ( substr( $rLL->[$Kfirst]->[_TOKEN_], 0, 4 ) eq '#<<<'
                    || $rOpts_format_skipping_begin )

                && $rOpts_format_skipping
                && ( $rLL->[$Kfirst]->[_TOKEN_] . SPACE ) =~
                /$format_skipping_pattern_begin/
              )
            {
                # warn of duplicate starting comment lines, git #118
                my $input_line_no = $line_of_tokens->{_line_number};
                warning(
"Already in format-skipping section which started at line $In_format_skipping_section\n",
                    $input_line_no
                );
            }
            else {
                ## ok - not at a format skipping control line
            }
            $CODE_type = 'FS';
            next;
        }

        # Check for a continued quote..
        if ( $line_of_tokens->{_starting_in_quote} ) {

            # A line which is entirely a quote or pattern must go out
            # verbatim.  Note: the \n is contained in $input_line.
            if ( $jmax <= 0 ) {
                if ( $self->[_save_logfile_] && $input_line =~ /\t/ ) {
                    my $input_line_number = $line_of_tokens->{_line_number};
                    $self->note_embedded_tab($input_line_number);
                }
                $CODE_type = 'VB';
                next;
            }
        }

        # See if we are entering a formatting skip section
        if (
            $is_block_comment

            # optional fast pre-check
            && ( substr( $rLL->[$Kfirst]->[_TOKEN_], 0, 4 ) eq '#<<<'
                || $rOpts_format_skipping_begin )

            && $rOpts_format_skipping
            && ( $rLL->[$Kfirst]->[_TOKEN_] . SPACE ) =~
            /$format_skipping_pattern_begin/
          )
        {
            my $input_line_no = $line_of_tokens->{_line_number};
            $In_format_skipping_section = $input_line_no;
            write_logfile_entry(
                "Line $input_line_no: Entering format-skipping section\n");
            $CODE_type = 'FS';
            next;
        }

        # ignore trailing blank tokens (they will get deleted later)
        if ( $jmax > 0 && $rLL->[$Klast]->[_TYPE_] eq 'b' ) {
            $jmax--;
        }

        # blank line..
        if ( $jmax < 0 ) {
            $CODE_type = 'BL';
            next;
        }

        # Handle comments
        if ($is_block_comment) {

            # see if this is a static block comment (starts with ## by default)
            my $is_static_block_comment = 0;
            my $no_leading_space        = substr( $input_line, 0, 1 ) eq '#';
            if (

                # optional fast pre-check
                (
                    substr( $rLL->[$Kfirst]->[_TOKEN_], 0, 2 ) eq '##'
                    || $rOpts_static_block_comment_prefix
                )

                && $rOpts_static_block_comments
                && $input_line =~ /$static_block_comment_pattern/
              )
            {
                $is_static_block_comment = 1;
            }

            # Check for comments which are line directives
            # Treat exactly as static block comments without leading space
            # reference: perlsyn, near end, section Plain Old Comments (Not!)
            # example: '# line 42 "new_filename.plx"'
            if (
                   $no_leading_space
                && $input_line =~ m{^\#   \s*
                                                      line \s+ (\d+)   \s*
                                                      (?:\s("?)([^"]+)\2)? \s*
                                                      $}x
              )
            {
                $is_static_block_comment = 1;
            }

            # look for hanging side comment ...
            if (
                $last_line_had_side_comment     # this follows as side comment
                && !$no_leading_space           # with some leading space, and
                && !$is_static_block_comment    # this is not a static comment
              )
            {

                #  continuing an existing HSC chain?
                if ( $last_CODE_type eq 'HSC' ) {
                    $has_side_comment = 1;
                    $CODE_type        = 'HSC';
                    next;
                }

                #  starting a new HSC chain?
                if (

                    $rOpts->{'hanging-side-comments'}    # user is allowing
                                                         # hanging side comments
                                                         # like this

                    && ( defined($Klast_prev) && $Klast_prev > 1 )

                    # and the previous side comment was not static (issue c070)
                    && !(
                           $rOpts->{'static-side-comments'}
                        && $rLL->[$Klast_prev]->[_TOKEN_] =~
                        /$static_side_comment_pattern/
                    )

                  )
                {

                    # and it is not a closing side comment (issue c070).
                    my $K_penult = $Klast_prev - 1;
                    $K_penult -= 1 if ( $rLL->[$K_penult]->[_TYPE_] eq 'b' );
                    my $follows_csc =
                      (      $rLL->[$K_penult]->[_TOKEN_] eq '}'
                          && $rLL->[$K_penult]->[_TYPE_] eq '}'
                          && $rLL->[$Klast_prev]->[_TOKEN_] =~
                          /$closing_side_comment_prefix_pattern/ );

                    if ( !$follows_csc ) {
                        $has_side_comment = 1;
                        $CODE_type        = 'HSC';
                        next;
                    }
                }
            }

            if ($is_static_block_comment) {
                $CODE_type = $no_leading_space ? 'SBCX' : 'SBC';
                next;
            }
            elsif ($last_line_had_side_comment
                && !$rOpts_maximum_consecutive_blank_lines
                && $rLL->[$Kfirst]->[_LEVEL_] > 0 )
            {
                # Emergency fix to keep a block comment from becoming a hanging
                # side comment.  This fix is for the case that blank lines
                # cannot be inserted.  There is related code in sub
                # 'process_line_of_CODE'
                $CODE_type = 'SBCX';
                next;
            }
            else {
                $CODE_type = 'BC';
                next;
            }
        }

        # End of comments. Handle a line of normal code:

        if ($rOpts_indent_only) {
            $CODE_type = 'IO';
            next;
        }

        if ( !$rOpts_add_newlines ) {
            $CODE_type = 'NIN';
            next;
        }

        #   Patch needed for MakeMaker.  Do not break a statement
        #   in which $VERSION may be calculated.  See MakeMaker.pm;
        #   this is based on the coding in it.
        #   The first line of a file that matches this will be eval'd:
        #       /([\$*])(([\w\:\']*)\bVERSION)\b.*\=/
        #   Examples:
        #     *VERSION = \'1.01';
        #     ( $VERSION ) = '$Revision: 1.74 $ ' =~ /\$Revision:\s+([^\s]+)/;
        #   We will pass such a line straight through without breaking
        #   it unless -npvl is used.

        #   Patch for problem reported in RT #81866, where files
        #   had been flattened into a single line and couldn't be
        #   tidied without -npvl.  There are two parts to this patch:
        #   First, it is not done for a really long line (80 tokens for now).
        #   Second, we will only allow up to one semicolon
        #   before the VERSION.  We need to allow at least one semicolon
        #   for statements like this:
        #      require Exporter;  our $VERSION = $Exporter::VERSION;
        #   where both statements must be on a single line for MakeMaker

        if (  !$Saw_VERSION_in_this_file
            && $jmax < 80
            && $input_line =~
            /^[^;]*;?[^;]*([\$*])(([\w\:\']*)\bVERSION)\b.*\=/ )
        {
            $Saw_VERSION_in_this_file = 1;
            write_logfile_entry("passing VERSION line; -npvl deactivates\n");

            # This code type has lower priority than others
            $CODE_type = 'VER';
            next;
        }
    }
    continue {
        $line_of_tokens->{_code_type} = $CODE_type;

        $last_line_had_side_comment = $has_side_comment;
        if ($has_side_comment) {
            push @ix_side_comments, $ix_line;
            $has_side_comment = 0;
        }
    }

    return \@ix_side_comments;
} ## end sub set_CODE_type

sub find_non_indenting_braces {

    my ( $self, $rix_side_comments ) = @_;

    # Find and mark all non-indenting braces in this file.

    # Given:
    #   $rix_side_comments = index of lines which have side comments
    # Find and save the line indexes of these special side comments in:
    #   $self->[_rseqno_non_indenting_brace_by_ix_];

    # Non-indenting braces are opening braces of the form
    #   { #<<< ...
    # which do not cause an increase in indentation level.
    # They are enabled with the --non-indenting-braces, or -nib, flag.

    return unless ( $rOpts->{'non-indenting-braces'} );
    my $rLL = $self->[_rLL_];
    return unless ( defined($rLL) && @{$rLL} );
    my $rlines               = $self->[_rlines_];
    my $rblock_type_of_seqno = $self->[_rblock_type_of_seqno_];
    my $rseqno_non_indenting_brace_by_ix =
      $self->[_rseqno_non_indenting_brace_by_ix_];

    foreach my $ix ( @{$rix_side_comments} ) {
        my $line_of_tokens = $rlines->[$ix];
        my $line_type      = $line_of_tokens->{_line_type};
        if ( $line_type ne 'CODE' ) {

            # shouldn't happen
            DEVEL_MODE && Fault("unexpected line_type=$line_type\n");
            next;
        }
        my $rK_range = $line_of_tokens->{_rK_range};
        my ( $Kfirst, $Klast ) = @{$rK_range};
        if ( !defined($Kfirst) || $rLL->[$Klast]->[_TYPE_] ne '#' ) {

            # shouldn't happen
            DEVEL_MODE && Fault("did not get a comment\n");
            next;
        }
        next if ( $Klast <= $Kfirst );    # maybe HSC
        my $token_sc = $rLL->[$Klast]->[_TOKEN_];
        my $K_m      = $Klast - 1;
        my $type_m   = $rLL->[$K_m]->[_TYPE_];
        if ( $type_m eq 'b' && $K_m > $Kfirst ) {
            $K_m--;
            $type_m = $rLL->[$K_m]->[_TYPE_];
        }
        my $seqno_m = $rLL->[$K_m]->[_TYPE_SEQUENCE_];
        if ($seqno_m) {
            my $block_type_m = $rblock_type_of_seqno->{$seqno_m};

            # The pattern ends in \s but we have removed the newline, so
            # we added it back for the match. That way we require an exact
            # match to the special string and also allow additional text.
            $token_sc .= "\n";
            if (   $block_type_m
                && $is_opening_type{$type_m}
                && $token_sc =~ /$non_indenting_brace_pattern/ )
            {
                $rseqno_non_indenting_brace_by_ix->{$ix} = $seqno_m;
            }
        }
    }
    return;
} ## end sub find_non_indenting_braces

sub delete_side_comments {
    my ( $self, $rix_side_comments ) = @_;

    # Given a list of indexes of lines with side comments, handle any
    # requested side comment deletions.

    my $rLL                  = $self->[_rLL_];
    my $rlines               = $self->[_rlines_];
    my $rblock_type_of_seqno = $self->[_rblock_type_of_seqno_];
    my $rseqno_non_indenting_brace_by_ix =
      $self->[_rseqno_non_indenting_brace_by_ix_];

    foreach my $ix ( @{$rix_side_comments} ) {
        my $line_of_tokens = $rlines->[$ix];
        my $line_type      = $line_of_tokens->{_line_type};

        # This fault shouldn't happen because we only saved CODE lines with
        # side comments in the TASK 1 loop above.
        if ( $line_type ne 'CODE' ) {
            if (DEVEL_MODE) {
                my $lno = $ix + 1;
                Fault(<<EOM);
Hit unexpected line_type = '$line_type' near line $lno while deleting side comments, should be 'CODE'
EOM
            }
            next;
        }

        my $CODE_type = $line_of_tokens->{_code_type};
        my $rK_range  = $line_of_tokens->{_rK_range};
        my ( $Kfirst, $Klast ) = @{$rK_range};

        if ( !defined($Kfirst) || $rLL->[$Klast]->[_TYPE_] ne '#' ) {
            if (DEVEL_MODE) {
                my $lno = $ix + 1;
                Fault(<<EOM);
Did not find side comment near line $lno while deleting side comments
EOM
            }
            next;
        }

        my $delete_side_comment =
             $rOpts_delete_side_comments
          && ( $Klast > $Kfirst || $CODE_type eq 'HSC' )
          && (!$CODE_type
            || $CODE_type eq 'HSC'
            || $CODE_type eq 'IO'
            || $CODE_type eq 'NIN' );

        # Do not delete special control side comments
        if ( $rseqno_non_indenting_brace_by_ix->{$ix} ) {
            $delete_side_comment = 0;
        }

        if (
               $rOpts_delete_closing_side_comments
            && !$delete_side_comment
            && $Klast > $Kfirst
            && (  !$CODE_type
                || $CODE_type eq 'HSC'
                || $CODE_type eq 'IO'
                || $CODE_type eq 'NIN' )
          )
        {
            my $token  = $rLL->[$Klast]->[_TOKEN_];
            my $K_m    = $Klast - 1;
            my $type_m = $rLL->[$K_m]->[_TYPE_];
            if ( $type_m eq 'b' && $K_m > $Kfirst ) { $K_m-- }
            my $seqno_m = $rLL->[$K_m]->[_TYPE_SEQUENCE_];
            if ($seqno_m) {
                my $block_type_m = $rblock_type_of_seqno->{$seqno_m};
                if (   $block_type_m
                    && $token        =~ /$closing_side_comment_prefix_pattern/
                    && $block_type_m =~ /$closing_side_comment_list_pattern/ )
                {
                    $delete_side_comment = 1;
                }
            }
        } ## end if ( $rOpts_delete_closing_side_comments...)

        if ($delete_side_comment) {

            # We are actually just changing the side comment to a blank.
            # This may produce multiple blanks in a row, but sub respace_tokens
            # will check for this and fix it.
            $rLL->[$Klast]->[_TYPE_]  = 'b';
            $rLL->[$Klast]->[_TOKEN_] = SPACE;

            # The -io option outputs the line text, so we have to update
            # the line text so that the comment does not reappear.
            if ( $CODE_type eq 'IO' ) {
                my $line = EMPTY_STRING;
                foreach my $KK ( $Kfirst .. $Klast - 1 ) {
                    $line .= $rLL->[$KK]->[_TOKEN_];
                }
                $line =~ s/\s+$//;
                $line_of_tokens->{_line_text} = $line . "\n";
            }

            # If we delete a hanging side comment the line becomes blank.
            if ( $CODE_type eq 'HSC' ) { $line_of_tokens->{_code_type} = 'BL' }
        }
    }
    return;
} ## end sub delete_side_comments

sub dump_verbatim {
    my $self = shift;

    # Dump the input file to the output verbatim. This is called when
    # there is a severe error and formatted output cannot be made.
    my $rlines = $self->[_rlines_];
    foreach my $line ( @{$rlines} ) {
        my $input_line = $line->{_line_text};
        $self->write_unindented_line($input_line);
    }
    return;
} ## end sub dump_verbatim

my %wU;
my %wiq;
my %is_witPS;
my %is_sigil;
my %is_nonlist_keyword;
my %is_nonlist_type;
my %is_s_y_m_slash;
my %is_unexpected_equals;
my %is_ascii_type;

BEGIN {

    # added 'U' to fix cases b1125 b1126 b1127
    my @q = qw(w U);
    @{wU}{@q} = (1) x scalar(@q);

    @q = qw(w i q Q G C Z);
    @{wiq}{@q} = (1) x scalar(@q);

    @q = qw(w i t P S);   # Fix for c250: added new types 'P', 'S', formerly 'i'
    @{is_witPS}{@q} = (1) x scalar(@q);

    @q = qw($ & % * @);
    @{is_sigil}{@q} = (1) x scalar(@q);

    # Parens following these keywords will not be marked as lists. Note that
    # 'for' is not included and is handled separately, by including 'f' in the
    # hash %is_counted_type, since it may or may not be a c-style for loop.
    @q = qw( if elsif unless and or );
    @is_nonlist_keyword{@q} = (1) x scalar(@q);

    # Parens following these types will not be marked as lists
    @q = qw( && || );
    @is_nonlist_type{@q} = (1) x scalar(@q);

    @q = qw( s y m / );
    @is_s_y_m_slash{@q} = (1) x scalar(@q);

    @q = qw( = == != );
    @is_unexpected_equals{@q} = (1) x scalar(@q);

    # We can always skip expensive length_function->() calls for these
    # ascii token types
    @q = qw#
      b k L R ; ( { [ ? : ] } ) f t n v F p m pp mm
      .. :: << >> ** && .. || // -> => += -= .= %= &= |= ^= *= <>
      ( ) <= >= == =~ !~ != ++ -- /= x=
      ... **= <<= >>= &&= ||= //= <=>
      + - / * | % ! x ~ = \ ? : . < > ^ &
      #;
    push @q, ',';
    @is_ascii_type{@q} = (1) x scalar(@q);

} ## end BEGIN

{ #<<< begin closure respace_tokens

my $rLL_new;    # This will be the new array of tokens

# These are variables in $self
my $rLL;
my $length_function;

my $K_closing_ternary;
my $K_opening_ternary;
my $rchildren_of_seqno;
my $rhas_broken_code_block;
my $rhas_broken_list;
my $rhas_broken_list_with_lec;
my $rhas_code_block;
my $rhas_list;
my $rhas_ternary;
my $ris_assigned_structure;
my $ris_broken_container;
my $ris_excluded_lp_container;
my $ris_list_by_seqno;
my $ris_permanently_broken;
my $rlec_count_by_seqno;
my $roverride_cab3;
my $rparent_of_seqno;
my $rtype_count_by_seqno;
my $rblock_type_of_seqno;

my $K_opening_container;
my $K_closing_container;

my %K_first_here_doc_by_seqno;

my $last_nonblank_code_type;
my $last_nonblank_code_token;
my $last_nonblank_block_type;
my $last_last_nonblank_code_type;
my $last_last_nonblank_code_token;

my %seqno_stack;
my %K_old_opening_by_seqno;
my $depth_next;
my $depth_next_max;

my $cumulative_length;

# Variables holding the current line info
my $Ktoken_vars;
my $Kfirst_old;
my $Klast_old;
my $Klast_old_code;
my $CODE_type;

my $rwhitespace_flags;

sub initialize_respace_tokens_closure {

    my ($self) = @_;

    $rLL_new = [];    # This is the new array

    $rLL = $self->[_rLL_];

    $length_function           = $self->[_length_function_];
    $K_closing_ternary         = $self->[_K_closing_ternary_];
    $K_opening_ternary         = $self->[_K_opening_ternary_];
    $rchildren_of_seqno        = $self->[_rchildren_of_seqno_];
    $rhas_broken_code_block    = $self->[_rhas_broken_code_block_];
    $rhas_broken_list          = $self->[_rhas_broken_list_];
    $rhas_broken_list_with_lec = $self->[_rhas_broken_list_with_lec_];
    $rhas_code_block           = $self->[_rhas_code_block_];
    $rhas_list                 = $self->[_rhas_list_];
    $rhas_ternary              = $self->[_rhas_ternary_];
    $ris_assigned_structure    = $self->[_ris_assigned_structure_];
    $ris_broken_container      = $self->[_ris_broken_container_];
    $ris_excluded_lp_container = $self->[_ris_excluded_lp_container_];
    $ris_list_by_seqno         = $self->[_ris_list_by_seqno_];
    $ris_permanently_broken    = $self->[_ris_permanently_broken_];
    $rlec_count_by_seqno       = $self->[_rlec_count_by_seqno_];
    $roverride_cab3            = $self->[_roverride_cab3_];
    $rparent_of_seqno          = $self->[_rparent_of_seqno_];
    $rtype_count_by_seqno      = $self->[_rtype_count_by_seqno_];
    $rblock_type_of_seqno      = $self->[_rblock_type_of_seqno_];

    %K_first_here_doc_by_seqno = ();

    $last_nonblank_code_type       = ';';
    $last_nonblank_code_token      = ';';
    $last_nonblank_block_type      = EMPTY_STRING;
    $last_last_nonblank_code_type  = ';';
    $last_last_nonblank_code_token = ';';

    %seqno_stack            = ();
    %K_old_opening_by_seqno = ();    # Note: old K index
    $depth_next             = 0;
    $depth_next_max         = 0;

    # we will be setting token lengths as we go
    $cumulative_length = 0;

    $Ktoken_vars    = undef;          # the old K value of $rtoken_vars
    $Kfirst_old     = undef;          # min K of old line
    $Klast_old      = undef;          # max K of old line
    $Klast_old_code = undef;          # K of last token if side comment
    $CODE_type      = EMPTY_STRING;

    # Set the whitespace flags, which indicate the token spacing preference.
    $rwhitespace_flags = $self->set_whitespace_flags();

    # Note that $K_opening_container and $K_closing_container have values
    # defined in sub get_line() for the previous K indexes.  They were needed
    # in case option 'indent-only' was set, and we didn't get here. We no
    # longer need those and will eliminate them now to avoid any possible
    # mixing of old and new values.  This must be done AFTER the call to
    # set_whitespace_flags, which needs these.
    $K_opening_container = $self->[_K_opening_container_] = {};
    $K_closing_container = $self->[_K_closing_container_] = {};

    return;

} ## end sub initialize_respace_tokens_closure

sub respace_tokens {

    my $self = shift;

    #--------------------------------------------------------------------------
    # This routine is called once per file to do as much formatting as possible
    # before new line breaks are set.
    #--------------------------------------------------------------------------

    # Return parameters:
    # Set $severe_error=true if processing must terminate immediately
    my ( $severe_error, $rqw_lines );

    # We change any spaces in --indent-only mode
    if ( $rOpts->{'indent-only'} ) {

        # We need to define lengths for -indent-only to avoid undefs, even
        # though these values are not actually needed for option --indent-only.

        $rLL               = $self->[_rLL_];
        $cumulative_length = 0;

        foreach my $item ( @{$rLL} ) {
            my $token = $item->[_TOKEN_];
            my $token_length =
              $length_function ? $length_function->($token) : length($token);
            $cumulative_length += $token_length;
            $item->[_TOKEN_LENGTH_]      = $token_length;
            $item->[_CUMULATIVE_LENGTH_] = $cumulative_length;
        }

        return ( $severe_error, $rqw_lines );
    }

    # This routine makes all necessary and possible changes to the tokenization
    # after the initial tokenization of the file. This is a tedious routine,
    # but basically it consists of inserting and deleting whitespace between
    # nonblank tokens according to the selected parameters. In a few cases
    # non-space characters are added, deleted or modified.

    # The goal of this routine is to create a new token array which only needs
    # the definition of new line breaks and padding to complete formatting.  In
    # a few cases we have to cheat a little to achieve this goal.  In
    # particular, we may not know if a semicolon will be needed, because it
    # depends on how the line breaks go.  To handle this, we include the
    # semicolon as a 'phantom' which can be displayed as normal or as an empty
    # string.

    # Method: The old tokens are copied one-by-one, with changes, from the old
    # linear storage array $rLL to a new array $rLL_new.

    # (re-)initialize closure variables for this problem
    $self->initialize_respace_tokens_closure();

    #--------------------------------
    # Main over all lines of the file
    #--------------------------------
    my $rlines    = $self->[_rlines_];
    my $line_type = EMPTY_STRING;
    my $last_K_out;

    foreach my $line_of_tokens ( @{$rlines} ) {

        my $input_line_number = $line_of_tokens->{_line_number};
        my $last_line_type    = $line_type;
        $line_type = $line_of_tokens->{_line_type};
        next unless ( $line_type eq 'CODE' );
        $CODE_type = $line_of_tokens->{_code_type};

        if ( $CODE_type eq 'BL' ) {
            my $seqno = $seqno_stack{ $depth_next - 1 };
            if ( defined($seqno) ) {
                $self->[_rblank_and_comment_count_]->{$seqno} += 1;
                $self->set_permanently_broken($seqno)
                  if (!$ris_permanently_broken->{$seqno}
                    && $rOpts_maximum_consecutive_blank_lines );
            }
        }

        my $rK_range = $line_of_tokens->{_rK_range};
        my ( $Kfirst, $Klast ) = @{$rK_range};
        next unless defined($Kfirst);
        ( $Kfirst_old, $Klast_old ) = ( $Kfirst, $Klast );
        $Klast_old_code = $Klast_old;

        # Be sure an old K value is defined for sub store_token
        $Ktoken_vars = $Kfirst;

        # Check for correct sequence of token indexes...
        # An error here means that sub write_line() did not correctly
        # package the tokenized lines as it received them.  If we
        # get a fault here it has not output a continuous sequence
        # of K values.  Or a line of CODE may have been mis-marked as
        # something else.  There is no good way to continue after such an
        # error.
        if ( defined($last_K_out) ) {
            if ( $Kfirst != $last_K_out + 1 ) {
                Fault_Warn(
                    "Program Bug: last K out was $last_K_out but Kfirst=$Kfirst"
                );
                $severe_error = 1;
                return ( $severe_error, $rqw_lines );
            }
        }
        else {

            # The first token should always have been given index 0 by sub
            # write_line()
            if ( $Kfirst != 0 ) {
                Fault("Program Bug: first K is $Kfirst but should be 0");
            }
        }
        $last_K_out = $Klast;

        # Handle special lines of code
        if ( $CODE_type && $CODE_type ne 'NIN' && $CODE_type ne 'VER' ) {

            # CODE_types are as follows.
            # 'BL' = Blank Line
            # 'VB' = Verbatim - line goes out verbatim
            # 'FS' = Format Skipping - line goes out verbatim, no blanks
            # 'IO' = Indent Only - only indentation may be changed
            # 'NIN' = No Internal Newlines - line does not get broken
            # 'HSC'=Hanging Side Comment - fix this hanging side comment
            # 'BC'=Block Comment - an ordinary full line comment
            # 'SBC'=Static Block Comment - a block comment which does not get
            #      indented
            # 'SBCX'=Static Block Comment Without Leading Space
            # 'VER'=VERSION statement
            # '' or (undefined) - no restrictions

            # For a hanging side comment we insert an empty quote before
            # the comment so that it becomes a normal side comment and
            # will be aligned by the vertical aligner
            if ( $CODE_type eq 'HSC' ) {

                # Safety Check: This must be a line with one token (a comment)
                my $rvars_Kfirst = $rLL->[$Kfirst];
                if ( $Kfirst == $Klast && $rvars_Kfirst->[_TYPE_] eq '#' ) {

                    # Note that even if the flag 'noadd-whitespace' is set, we
                    # will make an exception here and allow a blank to be
                    # inserted to push the comment to the right.  We can think
                    # of this as an adjustment of indentation rather than
                    # whitespace between tokens. This will also prevent the
                    # hanging side comment from getting converted to a block
                    # comment if whitespace gets deleted, as for example with
                    # the -extrude and -mangle options.
                    my $rcopy =
                      copy_token_as_type( $rvars_Kfirst, 'q', EMPTY_STRING );
                    $self->store_token($rcopy);
                    $rcopy = copy_token_as_type( $rvars_Kfirst, 'b', SPACE );
                    $self->store_token($rcopy);
                    $self->store_token($rvars_Kfirst);
                    next;
                }
                else {

                    # This line was mis-marked by sub scan_comment.  Catch in
                    # DEVEL_MODE, otherwise try to repair and keep going.
                    Fault(
                        "Program bug. A hanging side comment has been mismarked"
                    ) if (DEVEL_MODE);

                    $CODE_type = EMPTY_STRING;
                    $line_of_tokens->{_code_type} = $CODE_type;
                }
            }

            # Copy tokens unchanged
            foreach my $KK ( $Kfirst .. $Klast ) {
                $Ktoken_vars = $KK;
                $self->store_token( $rLL->[$KK] );
            }
            next;
        }

        # Handle normal line..

        # Define index of last token before any side comment for comma counts
        my $type_end = $rLL->[$Klast_old_code]->[_TYPE_];
        if ( ( $type_end eq '#' || $type_end eq 'b' )
            && $Klast_old_code > $Kfirst_old )
        {
            $Klast_old_code--;
            if (   $rLL->[$Klast_old_code]->[_TYPE_] eq 'b'
                && $Klast_old_code > $Kfirst_old )
            {
                $Klast_old_code--;
            }
        }

        # Insert any essential whitespace between lines
        # if last line was normal CODE.
        # Patch for rt #125012: use K_previous_code rather than '_nonblank'
        # because comments may disappear.
        # Note that we must do this even if --noadd-whitespace is set
        if ( $last_line_type eq 'CODE' ) {
            my $type_next  = $rLL->[$Kfirst]->[_TYPE_];
            my $token_next = $rLL->[$Kfirst]->[_TOKEN_];
            if (
                is_essential_whitespace(
                    $last_last_nonblank_code_token,
                    $last_last_nonblank_code_type,
                    $last_nonblank_code_token,
                    $last_nonblank_code_type,
                    $token_next,
                    $type_next,
                )
              )
            {
                $self->store_token();
            }
        }

        #-----------------------------------------------
        # Inner loop to respace tokens on a line of code
        #-----------------------------------------------

        # The inner loop is in a separate sub for clarity
        $self->respace_tokens_inner_loop( $Kfirst, $Klast, $input_line_number );

    }    # End line loop

    # finalize data structures
    $self->respace_post_loop_ops();

    # Reset memory to be the new array
    $self->[_rLL_] = $rLL_new;
    my $Klimit;
    if ( @{$rLL_new} ) { $Klimit = @{$rLL_new} - 1 }
    $self->[_Klimit_] = $Klimit;

    # During development, verify that the new array still looks okay.
    DEVEL_MODE && $self->check_token_array();

    # update the token limits of each line
    ( $severe_error, $rqw_lines ) = $self->resync_lines_and_tokens();

    return ( $severe_error, $rqw_lines );
} ## end sub respace_tokens

sub respace_tokens_inner_loop {

    my ( $self, $Kfirst, $Klast, $input_line_number ) = @_;

    #-----------------------------------------------------------------
    # Loop to copy all tokens on one line, making any spacing changes,
    # while also collecting information needed by later subs.
    #-----------------------------------------------------------------
    foreach my $KK ( $Kfirst .. $Klast ) {

        # TODO: consider eliminating this closure var by passing directly to
        # store_token following pattern of store_token_to_go.
        $Ktoken_vars = $KK;

        my $rtoken_vars = $rLL->[$KK];
        my $type        = $rtoken_vars->[_TYPE_];

        # Handle a blank space ...
        if ( $type eq 'b' ) {

            # Delete it if not wanted by whitespace rules
            # or we are deleting all whitespace
            # Note that whitespace flag is a flag indicating whether a
            # white space BEFORE the token is needed
            next if ( $KK >= $Klast );    # skip terminal blank
            my $Knext = $KK + 1;

            if ($rOpts_freeze_whitespace) {
                $self->store_token($rtoken_vars);
                next;
            }

            my $ws = $rwhitespace_flags->[$Knext];
            if (   $ws == -1
                || $rOpts_delete_old_whitespace )
            {

                my $token_next = $rLL->[$Knext]->[_TOKEN_];
                my $type_next  = $rLL->[$Knext]->[_TYPE_];

                my $do_not_delete = is_essential_whitespace(
                    $last_last_nonblank_code_token,
                    $last_last_nonblank_code_type,
                    $last_nonblank_code_token,
                    $last_nonblank_code_type,
                    $token_next,
                    $type_next,
                );

                # Note that repeated blanks will get filtered out here
                next unless ($do_not_delete);
            }

            # make it just one character
            $rtoken_vars->[_TOKEN_] = SPACE;
            $self->store_token($rtoken_vars);
            next;
        }

        my $token = $rtoken_vars->[_TOKEN_];

        # Handle a sequenced token ... i.e. one of ( ) { } [ ] ? :
        if ( $rtoken_vars->[_TYPE_SEQUENCE_] ) {

            # One of ) ] } ...
            if ( $is_closing_token{$token} ) {

                my $type_sequence = $rtoken_vars->[_TYPE_SEQUENCE_];
                my $block_type    = $rblock_type_of_seqno->{$type_sequence};

                #---------------------------------------------
                # check for semicolon addition in a code block
                #---------------------------------------------
                if ($block_type) {

                    # if not preceded by a ';' ..
                    if ( $last_nonblank_code_type ne ';' ) {

                        # tentatively insert a semicolon if appropriate
                        $self->add_phantom_semicolon($KK)
                          if $rOpts->{'add-semicolons'};
                    }
                }

                #----------------------------------------------------------
                # check for addition/deletion of a trailing comma in a list
                #----------------------------------------------------------
                else {

                    # if this is a list ..
                    my $rtype_count = $rtype_count_by_seqno->{$type_sequence};
                    if (   $rtype_count
                        && $rtype_count->{','}
                        && !$rtype_count->{';'}
                        && !$rtype_count->{'f'} )
                    {

                        # if NOT preceded by a comma..
                        if ( $last_nonblank_code_type ne ',' ) {

                            # insert a comma if requested
                            if (   $rOpts_add_trailing_commas
                                && %trailing_comma_rules )
                            {
                                $self->add_trailing_comma( $KK, $Kfirst,
                                    $trailing_comma_rules{$token} );
                            }
                        }

                        # if preceded by a comma ..
                        else {

                            # delete a trailing comma if requested
                            my $deleted;
                            if (   $rOpts_delete_trailing_commas
                                && %trailing_comma_rules )
                            {
                                $deleted =
                                  $self->delete_trailing_comma( $KK, $Kfirst,
                                    $trailing_comma_rules{$token} );
                            }

                            # delete a weld-interfering comma if requested
                            if (  !$deleted
                                && $rOpts_delete_weld_interfering_commas
                                && $is_closing_type{
                                    $last_last_nonblank_code_type} )
                            {
                                $self->delete_weld_interfering_comma($KK);
                            }
                        }
                    }
                }
            }
        }

        # Modify certain tokens here for whitespace
        # The following is not yet done, but could be:
        #   sub (x x x)
        #     ( $type =~ /^[witPS]$/ )
        elsif ( $is_witPS{$type} ) {

            # index() is several times faster than a regex test with \s here
            ##   $token =~ /\s/
            if ( index( $token, SPACE ) > 0 || index( $token, "\t" ) > 0 ) {

                # change '$  var'  to '$var' etc
                # change '@    '   to '@'
                # Examples: <<snippets/space1.in>>
                my $ord = ord( substr( $token, 1, 1 ) );
                if (

                    # quick test for possible blank at second char
                    $ord > 0 && ( $ord < ORD_PRINTABLE_MIN
                        || $ord > ORD_PRINTABLE_MAX )
                  )
                {
                    my ( $sigil, $word ) = split /\s+/, $token, 2;

                    # $sigil =~ /^[\$\&\%\*\@]$/ )
                    if ( $is_sigil{$sigil} ) {
                        $token = $sigil;
                        $token .= $word if ( defined($word) );    # fix c104
                        $rtoken_vars->[_TOKEN_] = $token;
                    }
                }

                # trim identifiers of trailing blanks which can occur
                # under some unusual circumstances, such as if the
                # identifier 'witch' has trailing blanks on input here:
                #
                # sub
                # witch
                # ()   # prototype may be on new line ...
                # ...
                my $ord_ch = ord( substr( $token, -1, 1 ) );
                if (

                    # quick check for possible ending space
                    $ord_ch > 0 && ( $ord_ch < ORD_PRINTABLE_MIN
                        || $ord_ch > ORD_PRINTABLE_MAX )
                  )
                {
                    $token =~ s/\s+$//g;
                    $rtoken_vars->[_TOKEN_] = $token;
                }

                # Fixed for c250 to use 'S' for sub definitions
                if ( $type eq 'S' ) {

                    # -spp = 0 : no space before opening prototype paren
                    # -spp = 1 : stable (follow input spacing)
                    # -spp = 2 : always space before opening prototype paren
                    if ( !defined($rOpts_space_prototype_paren)
                        || $rOpts_space_prototype_paren == 1 )
                    {
                        ## default: stable
                    }
                    elsif ( $rOpts_space_prototype_paren == 0 ) {
                        $token =~ s/\s+\(/\(/;
                    }
                    elsif ( $rOpts_space_prototype_paren == 2 ) {
                        $token =~ s/\(/ (/;
                    }
                    else {
                        # bad n value for -spp=n
                        # just use the default
                    }

                    # one space max, and no tabs
                    $token =~ s/\s+/ /g;
                    $rtoken_vars->[_TOKEN_] = $token;

                    $self->[_ris_special_identifier_token_]->{$token} = 'sub';
                }

                # and trim spaces in package statements (added for c250)
                elsif ( $type eq 'P' ) {

                    # clean up spaces in package identifiers, like
                    #   "package        Bob::Dog;"
                    if ( $token =~ s/\s+/ /g ) {
                        $rtoken_vars->[_TOKEN_] = $token;
                        $self->[_ris_special_identifier_token_]->{$token} =
                          'package';
                    }
                }
                else {
                    # it is rare to arrive here (identifier with spaces)
                }
            }
        }

        # handle semicolons
        elsif ( $type eq ';' ) {

            # Remove unnecessary semicolons, but not after bare
            # blocks, where it could be unsafe if the brace is
            # mis-tokenized.
            if (
                $rOpts->{'delete-semicolons'}
                && (
                    (
                           $last_nonblank_block_type
                        && $last_nonblank_code_type eq '}'
                        && (
                            $is_block_without_semicolon{
                                $last_nonblank_block_type}
                            || $last_nonblank_block_type =~ /$SUB_PATTERN/
                            || $last_nonblank_block_type =~ /^\w+:$/
                        )
                    )
                    || $last_nonblank_code_type eq ';'
                )
              )
            {

                # This looks like a deletable semicolon, but even if a
                # semicolon can be deleted it is not necessarily best to do
                # so.  We apply these additional rules for deletion:
                # - Always ok to delete a ';' at the end of a line
                # - Never delete a ';' before a '#' because it would
                #   promote it to a block comment.
                # - If a semicolon is not at the end of line, then only
                #   delete if it is followed by another semicolon or closing
                #   token.  This includes the comment rule.  It may take
                #   two passes to get to a final state, but it is a little
                #   safer.  For example, keep the first semicolon here:
                #      eval { sub bubba { ok(0) }; ok(0) } || ok(1);
                #   It is not required but adds some clarity.
                my $ok_to_delete = 1;
                if ( $KK < $Klast ) {
                    my $Kn = $self->K_next_nonblank($KK);
                    if ( defined($Kn) && $Kn <= $Klast ) {
                        my $next_nonblank_token_type = $rLL->[$Kn]->[_TYPE_];
                        $ok_to_delete = $next_nonblank_token_type eq ';'
                          || $next_nonblank_token_type eq '}';
                    }
                }

                # do not delete only nonblank token in a file
                else {
                    my $Kp = $self->K_previous_code( undef, $rLL_new );
                    my $Kn = $self->K_next_nonblank($KK);
                    $ok_to_delete = defined($Kn) || defined($Kp);
                }

                if ($ok_to_delete) {
                    $self->note_deleted_semicolon($input_line_number);
                    next;
                }
                else {
                    write_logfile_entry("Extra ';'\n");
                }
            }
        }

        # Old patch to add space to something like "x10".
        # Note: This is now done in the Tokenizer, but this code remains
        # for reference.
        elsif ( $type eq 'n' ) {
            if ( substr( $token, 0, 1 ) eq 'x' && $token =~ /^x\d+/ ) {
                $token =~ s/x/x /;
                $rtoken_vars->[_TOKEN_] = $token;
                if (DEVEL_MODE) {
                    Fault(<<EOM);
Near line $input_line_number, Unexpected need to split a token '$token' - this should now be done by the Tokenizer
EOM
                }
            }
        }

        # check for a qw quote
        elsif ( $type eq 'q' ) {

            # trim blanks from right of qw quotes
            # (To avoid trimming qw quotes use -ntqw; the tokenizer handles
            # this)
            $token =~ s/\s*$//;
            $rtoken_vars->[_TOKEN_] = $token;
            if ( $self->[_save_logfile_] && $token =~ /\t/ ) {
                $self->note_embedded_tab($input_line_number);
            }
            if (   $rwhitespace_flags->[$KK] == WS_YES
                && @{$rLL_new}
                && $rLL_new->[-1]->[_TYPE_] ne 'b'
                && $rOpts_add_whitespace )
            {
                $self->store_token();
            }
            $self->store_token($rtoken_vars);
            next;
        } ## end if ( $type eq 'q' )

        # delete repeated commas if requested
        elsif ( $type eq ',' ) {
            if (   $last_nonblank_code_type eq ','
                && $rOpts->{'delete-repeated-commas'} )
            {
                # Could note this deletion as a possible future update:
                ## $self->note_deleted_comma($input_line_number);
                next;
            }

            # remember input line index of first comma if -wtc is used
            if (%trailing_comma_rules) {
                my $seqno = $seqno_stack{ $depth_next - 1 };
                if ( defined($seqno)
                    && !defined( $self->[_rfirst_comma_line_index_]->{$seqno} )
                  )
                {
                    $self->[_rfirst_comma_line_index_]->{$seqno} =
                      $rtoken_vars->[_LINE_INDEX_];
                }
            }
        }

        # change 'LABEL   :'   to 'LABEL:'
        elsif ( $type eq 'J' ) {
            $token =~ s/\s+//g;
            $rtoken_vars->[_TOKEN_] = $token;
        }

        # check a quote for problems
        elsif ( $type eq 'Q' ) {
            $self->check_Q( $KK, $Kfirst, $input_line_number )
              if ( $self->[_save_logfile_] );
        }
        else {
            ## ok - no special processing for this token type
        }

        # Store this token with possible previous blank
        if (   $rwhitespace_flags->[$KK] == WS_YES
            && @{$rLL_new}
            && $rLL_new->[-1]->[_TYPE_] ne 'b'
            && $rOpts_add_whitespace )
        {
            $self->store_token();
        }
        $self->store_token($rtoken_vars);

    }    # End token loop

    return;
} ## end sub respace_tokens_inner_loop

sub respace_post_loop_ops {

    my ($self) = @_;

    # Walk backwards through the tokens, making forward links to sequence items.
    if ( @{$rLL_new} ) {
        my $KNEXT;
        foreach my $KK ( reverse( 0 .. @{$rLL_new} - 1 ) ) {
            $rLL_new->[$KK]->[_KNEXT_SEQ_ITEM_] = $KNEXT;
            if ( $rLL_new->[$KK]->[_TYPE_SEQUENCE_] ) { $KNEXT = $KK }
        }
        $self->[_K_first_seq_item_] = $KNEXT;
    }

    # Find and remember lists by sequence number
    foreach my $seqno ( keys %{$K_opening_container} ) {
        my $K_opening = $K_opening_container->{$seqno};
        next unless defined($K_opening);

        # code errors may leave undefined closing tokens
        my $K_closing = $K_closing_container->{$seqno};
        next unless defined($K_closing);

        my $lx_open   = $rLL_new->[$K_opening]->[_LINE_INDEX_];
        my $lx_close  = $rLL_new->[$K_closing]->[_LINE_INDEX_];
        my $line_diff = $lx_close - $lx_open;
        $ris_broken_container->{$seqno} = $line_diff;

        # See if this is a list
        my $is_list;
        my $rtype_count = $rtype_count_by_seqno->{$seqno};
        if ($rtype_count) {
            my $comma_count     = $rtype_count->{','};
            my $fat_comma_count = $rtype_count->{'=>'};
            my $semicolon_count = $rtype_count->{';'};
            if ( $rtype_count->{'f'} ) {
                $semicolon_count += $rtype_count->{'f'};
            }

            # We will define a list to be a container with one or more commas
            # and no semicolons. Note that we have included the semicolons
            # in a 'for' container in the semicolon count to keep c-style for
            # statements from being formatted as lists.
            if ( ( $comma_count || $fat_comma_count ) && !$semicolon_count ) {
                $is_list = 1;

                # We need to do one more check for a parenthesized list:
                # At an opening paren following certain tokens, such as 'if',
                # we do not want to format the contents as a list.
                if ( $rLL_new->[$K_opening]->[_TOKEN_] eq '(' ) {
                    my $Kp = $self->K_previous_code( $K_opening, $rLL_new );
                    if ( defined($Kp) ) {
                        my $type_p  = $rLL_new->[$Kp]->[_TYPE_];
                        my $token_p = $rLL_new->[$Kp]->[_TOKEN_];
                        $is_list =
                          $type_p eq 'k'
                          ? !$is_nonlist_keyword{$token_p}
                          : !$is_nonlist_type{$type_p};
                    }
                }
            }
        }

        # Look for a block brace marked as uncertain.  If the tokenizer thinks
        # its guess is uncertain for the type of a brace following an unknown
        # bareword then it adds a trailing space as a signal.  We can fix the
        # type here now that we have had a better look at the contents of the
        # container. This fixes case b1085. To find the corresponding code in
        # Tokenizer.pm search for 'b1085' with an editor.
        my $block_type = $rblock_type_of_seqno->{$seqno};
        if ( $block_type && substr( $block_type, -1, 1 ) eq SPACE ) {

            # Always remove the trailing space
            $block_type =~ s/\s+$//;

            # Try to filter out parenless sub calls
            my $Knn1 = $self->K_next_nonblank( $K_opening, $rLL_new );
            my $Knn2;
            if ( defined($Knn1) ) {
                $Knn2 = $self->K_next_nonblank( $Knn1, $rLL_new );
            }
            my $type_nn1 = defined($Knn1) ? $rLL_new->[$Knn1]->[_TYPE_] : 'b';
            my $type_nn2 = defined($Knn2) ? $rLL_new->[$Knn2]->[_TYPE_] : 'b';

            #   if ( $type_nn1 =~ /^[wU]$/ && $type_nn2 =~ /^[wiqQGCZ]$/ ) {
            if ( $wU{$type_nn1} && $wiq{$type_nn2} ) {
                $is_list = 0;
            }

            # Convert to a hash brace if it looks like it holds a list
            if ($is_list) {
                $block_type = EMPTY_STRING;
            }

            $rblock_type_of_seqno->{$seqno} = $block_type;
        }

        # Handle a list container
        if ( $is_list && !$block_type ) {
            $ris_list_by_seqno->{$seqno} = $seqno;
            my $seqno_parent = $rparent_of_seqno->{$seqno};
            my $depth        = 0;
            while ( defined($seqno_parent) && $seqno_parent ne SEQ_ROOT ) {
                $depth++;

                # for $rhas_list we need to save the minimum depth
                if (  !$rhas_list->{$seqno_parent}
                    || $rhas_list->{$seqno_parent} > $depth )
                {
                    $rhas_list->{$seqno_parent} = $depth;
                }

                if ($line_diff) {
                    $rhas_broken_list->{$seqno_parent} = 1;

                    # Patch1: We need to mark broken lists with non-terminal
                    # line-ending commas for the -bbx=2 parameter. This insures
                    # that the list will stay broken.  Otherwise the flag
                    # -bbx=2 can be unstable.  This fixes case b789 and b938.

                    # Patch2: Updated to also require either one fat comma or
                    # one more line-ending comma.  Fixes cases b1069 b1070
                    # b1072 b1076.
                    if (
                        $rlec_count_by_seqno->{$seqno}
                        && (   $rlec_count_by_seqno->{$seqno} > 1
                            || $rtype_count_by_seqno->{$seqno}->{'=>'} )
                      )
                    {
                        $rhas_broken_list_with_lec->{$seqno_parent} = 1;
                    }
                }
                $seqno_parent = $rparent_of_seqno->{$seqno_parent};
            }
        }

        # Handle code blocks ...
        # The -lp option needs to know if a container holds a code block
        elsif ( $block_type && $rOpts_line_up_parentheses ) {
            my $seqno_parent = $rparent_of_seqno->{$seqno};
            while ( defined($seqno_parent) && $seqno_parent ne SEQ_ROOT ) {
                $rhas_code_block->{$seqno_parent}        = 1;
                $rhas_broken_code_block->{$seqno_parent} = $line_diff;
                $seqno_parent = $rparent_of_seqno->{$seqno_parent};
            }
        }
        else {
            ## ok - none of the above
        }
    }

    # Find containers with ternaries, needed for -lp formatting.
    foreach my $seqno ( keys %{$K_opening_ternary} ) {
        my $seqno_parent = $rparent_of_seqno->{$seqno};
        while ( defined($seqno_parent) && $seqno_parent ne SEQ_ROOT ) {
            $rhas_ternary->{$seqno_parent} = 1;
            $seqno_parent = $rparent_of_seqno->{$seqno_parent};
        }
    }

    # Turn off -lp for containers with here-docs with text within a container,
    # since they have their own fixed indentation.  Fixes case b1081.
    if ($rOpts_line_up_parentheses) {
        foreach my $seqno ( keys %K_first_here_doc_by_seqno ) {
            my $Kh      = $K_first_here_doc_by_seqno{$seqno};
            my $Kc      = $K_closing_container->{$seqno};
            my $line_Kh = $rLL_new->[$Kh]->[_LINE_INDEX_];
            my $line_Kc = $rLL_new->[$Kc]->[_LINE_INDEX_];
            next if ( $line_Kh == $line_Kc );
            $ris_excluded_lp_container->{$seqno} = 1;
        }
    }

    # Set a flag to turn off -cab=3 in complex structures.  Otherwise,
    # instability can occur.  When it is overridden the behavior of the closest
    # match, -cab=2, will be used instead.  This fixes cases b1096 b1113.
    if ( $rOpts_comma_arrow_breakpoints == 3 ) {
        foreach my $seqno ( keys %{$K_opening_container} ) {

            my $rtype_count = $rtype_count_by_seqno->{$seqno};
            next unless ( $rtype_count && $rtype_count->{'=>'} );

            # override -cab=3 if this contains a sub-list
            if ( !defined( $roverride_cab3->{$seqno} ) ) {
                if ( $rhas_list->{$seqno} ) {
                    $roverride_cab3->{$seqno} = 2;
                }

                # or if this is a sub-list of its parent container
                else {
                    my $seqno_parent = $rparent_of_seqno->{$seqno};
                    if ( defined($seqno_parent)
                        && $ris_list_by_seqno->{$seqno_parent} )
                    {
                        $roverride_cab3->{$seqno} = 2;
                    }
                }
            }
        }
    }

    return;
} ## end sub respace_post_loop_ops

sub set_permanently_broken {
    my ( $self, $seqno ) = @_;

    # Mark this container, and all of its parent containers, as being
    # permanently broken (for example, by containing a blank line).  This
    # is needed for certain list formatting operations.
    while ( defined($seqno) ) {
        $ris_permanently_broken->{$seqno} = 1;
        $seqno = $rparent_of_seqno->{$seqno};
    }
    return;
} ## end sub set_permanently_broken

sub store_token {

    my ( $self, $item ) = @_;

    #------------------------------------------
    # Store one token during respace operations
    #------------------------------------------

    # Input parameter:
    #  if defined => reference to a token
    #  if undef   => make and store a blank space

    # NOTE: called once per token so coding efficiency is critical.

    # If no arg, then make and store a blank space
    if ( !$item ) {

        #  - Never start the array with a space, and
        #  - Never store two consecutive spaces
        if ( @{$rLL_new} && $rLL_new->[-1]->[_TYPE_] ne 'b' ) {

            # Note that the level and ci_level of newly created spaces should
            # be the same as the previous token.  Otherwise the coding for the
            # -lp option can create a blinking state in some rare cases.
            # (see b1109, b1110).
            $item                    = [];
            $item->[_TYPE_]          = 'b';
            $item->[_TOKEN_]         = SPACE;
            $item->[_TYPE_SEQUENCE_] = EMPTY_STRING;
            $item->[_LINE_INDEX_]    = $rLL_new->[-1]->[_LINE_INDEX_];
            $item->[_LEVEL_]         = $rLL_new->[-1]->[_LEVEL_];
        }
        else { return }
    }

    # The next multiple assignment statements are significantly faster than
    # doing them one-by-one.
    my (

        $type,
        $token,
        $type_sequence,

      ) = @{$item}[

      _TYPE_,
      _TOKEN_,
      _TYPE_SEQUENCE_,

      ];

    # Set the token length.  Later it may be adjusted again if phantom or
    # ignoring side comment lengths. It is always okay to calculate the length
    # with $length_function->() if it is defined, but it is extremely slow so
    # we avoid it and use the builtin length() for printable ascii tokens.
    # Note: non-printable ascii characters (like tab) may get different lengths
    # by the two methods, so we have to use $length_function for them.
    my $token_length =
      (      $length_function
          && !$is_ascii_type{$type}
          && $token =~ /[[:^ascii:][:^print:]]/ )
      ? $length_function->($token)
      : length($token);

    # handle blanks
    if ( $type eq 'b' ) {

        # Do not output consecutive blanks. This situation should have been
        # prevented earlier, but it is worth checking because later routines
        # make this assumption.
        if ( @{$rLL_new} && $rLL_new->[-1]->[_TYPE_] eq 'b' ) {
            return;
        }
    }

    # handle comments
    elsif ( $type eq '#' ) {

        # trim comments if necessary
        my $ord = ord( substr( $token, -1, 1 ) );
        if (
            $ord > 0
            && (   $ord < ORD_PRINTABLE_MIN
                || $ord > ORD_PRINTABLE_MAX )
            && $token =~ s/\s+$//
          )
        {
            $token_length =
              $length_function ? $length_function->($token) : length($token);
            $item->[_TOKEN_] = $token;
        }

        my $ignore_sc_length = $rOpts_ignore_side_comment_lengths;

        # Ignore length of '## no critic' comments even if -iscl is not set
        if (   !$ignore_sc_length
            && !$rOpts_ignore_perlcritic_comments
            && $token_length > 10
            && substr( $token, 1, 1 ) eq '#'
            && $token =~ /^##\s*no\s+critic\b/ )
        {

            # Is it a side comment or a block comment?
            if ( $Ktoken_vars > $Kfirst_old ) {

                # This is a side comment. If we do not ignore its length, and
                # -iscl has not been set, then the line could be broken and
                # perlcritic will complain. So this is essential:
                $ignore_sc_length ||= 1;

                # It would be a good idea to also make this behave like a
                # static side comment, but this is not essential and would
                # change existing formatting.  So we will leave it to the user
                # to set -ssc if desired.
            }
            else {

                # This is a full-line (block) comment.
                # It would be a good idea to make this behave like a static
                # block comment, but this is not essential and would change
                # existing formatting.  So we will leave it to the user to
                # set -sbc if desired
            }
        }

        # Set length of ignored side comments as just 1
        if ( $ignore_sc_length && ( !$CODE_type || $CODE_type eq 'HSC' ) ) {
            $token_length = 1;
        }

        my $seqno = $seqno_stack{ $depth_next - 1 };
        if ( defined($seqno) ) {
            $self->[_rblank_and_comment_count_]->{$seqno} += 1
              if ( $CODE_type eq 'BC' );
            $self->set_permanently_broken($seqno)
              if !$ris_permanently_broken->{$seqno};
        }
    }

    # handle non-blanks and non-comments
    else {

        my $block_type;

        # check for a sequenced item (i.e., container or ?/:)
        if ($type_sequence) {

            # This will be the index of this item in the new array
            my $KK_new = @{$rLL_new};

            if ( $is_opening_token{$token} ) {

                $K_opening_container->{$type_sequence} = $KK_new;
                $block_type = $rblock_type_of_seqno->{$type_sequence};

                # Fix for case b1100: Count a line ending in ', [' as having
                # a line-ending comma.  Otherwise, these commas can be hidden
                # with something like --opening-square-bracket-right
                if (   $last_nonblank_code_type eq ','
                    && $Ktoken_vars == $Klast_old_code
                    && $Ktoken_vars > $Kfirst_old )
                {
                    $rlec_count_by_seqno->{$type_sequence}++;
                }

                if (   $last_nonblank_code_type eq '='
                    || $last_nonblank_code_type eq '=>' )
                {
                    $ris_assigned_structure->{$type_sequence} =
                      $last_nonblank_code_type;
                }

                my $seqno_parent = $seqno_stack{ $depth_next - 1 };
                $seqno_parent = SEQ_ROOT unless defined($seqno_parent);
                push @{ $rchildren_of_seqno->{$seqno_parent} }, $type_sequence;
                $rparent_of_seqno->{$type_sequence}     = $seqno_parent;
                $seqno_stack{$depth_next}               = $type_sequence;
                $K_old_opening_by_seqno{$type_sequence} = $Ktoken_vars;
                $depth_next++;

                if ( $depth_next > $depth_next_max ) {
                    $depth_next_max = $depth_next;
                }
            }
            elsif ( $is_closing_token{$token} ) {

                $K_closing_container->{$type_sequence} = $KK_new;
                $block_type = $rblock_type_of_seqno->{$type_sequence};

                # Do not include terminal commas in counts
                if (   $last_nonblank_code_type eq ','
                    || $last_nonblank_code_type eq '=>' )
                {
                    $rtype_count_by_seqno->{$type_sequence}
                      ->{$last_nonblank_code_type}--;

                    if (   $Ktoken_vars == $Kfirst_old
                        && $last_nonblank_code_type eq ','
                        && $rlec_count_by_seqno->{$type_sequence} )
                    {
                        $rlec_count_by_seqno->{$type_sequence}--;
                    }
                }

                # Update the stack...
                $depth_next--;
            }
            else {

                # For ternary, note parent but do not include as child
                my $seqno_parent = $seqno_stack{ $depth_next - 1 };
                $seqno_parent = SEQ_ROOT unless defined($seqno_parent);
                $rparent_of_seqno->{$type_sequence} = $seqno_parent;

                # These are not yet used but could be useful
                if ( $token eq '?' ) {
                    $K_opening_ternary->{$type_sequence} = $KK_new;
                }
                elsif ( $token eq ':' ) {
                    $K_closing_ternary->{$type_sequence} = $KK_new;
                }
                else {

                    # We really shouldn't arrive here, just being cautious:
                    # The only sequenced types output by the tokenizer are the
                    # opening & closing containers and the ternary types. Each
                    # of those was checked above. So we would only get here
                    # if the tokenizer has been changed to mark some other
                    # tokens with sequence numbers.
                    if (DEVEL_MODE) {
                        Fault(
"Unexpected token type with sequence number: type='$type', seqno='$type_sequence'"
                        );
                    }
                }
            }
        }

        # Remember the most recent two non-blank, non-comment tokens.
        # NOTE: the phantom semicolon code may change the output stack
        # without updating these values.  Phantom semicolons are considered
        # the same as blanks for now, but future needs might change that.
        # See the related note in sub 'add_phantom_semicolon'.
        $last_last_nonblank_code_type  = $last_nonblank_code_type;
        $last_last_nonblank_code_token = $last_nonblank_code_token;

        $last_nonblank_code_type  = $type;
        $last_nonblank_code_token = $token;
        $last_nonblank_block_type = $block_type;

        # count selected types
        if ( $is_counted_type{$type} ) {
            my $seqno = $seqno_stack{ $depth_next - 1 };
            if ( defined($seqno) ) {
                $rtype_count_by_seqno->{$seqno}->{$type}++;

                # Count line-ending commas for -bbx
                if ( $type eq ',' && $Ktoken_vars == $Klast_old_code ) {
                    $rlec_count_by_seqno->{$seqno}++;
                }

                # Remember index of first here doc target
                if ( $type eq 'h' && !$K_first_here_doc_by_seqno{$seqno} ) {
                    my $KK_new = @{$rLL_new};
                    $K_first_here_doc_by_seqno{$seqno} = $KK_new;
                }
            }
        }
    }

    # cumulative length is the length sum including this token
    $cumulative_length += $token_length;

    $item->[_CUMULATIVE_LENGTH_] = $cumulative_length;
    $item->[_TOKEN_LENGTH_]      = $token_length;

    # For reference, here is how to get the parent sequence number.
    # This is not used because it is slower than finding it on the fly
    # in sub parent_seqno_by_K:

    # my $seqno_parent =
    #     $type_sequence && $is_opening_token{$token}
    #   ? $seqno_stack{ $depth_next - 2 }
    #   : $seqno_stack{ $depth_next - 1 };
    # my $KK = @{$rLL_new};
    # $rseqno_of_parent_by_K->{$KK} = $seqno_parent;

    # and finally, add this item to the new array
    push @{$rLL_new}, $item;
    return;
} ## end sub store_token

sub add_phantom_semicolon {

    my ( $self, $KK ) = @_;

    # The token at old index $KK is a closing block brace, and not preceded
    # by a semicolon. Before we push it onto the new token list, we may
    # want to add a phantom semicolon which can be activated if the the
    # block is broken on output.

    # We are only adding semicolons for certain block types
    my $type_sequence = $rLL->[$KK]->[_TYPE_SEQUENCE_];
    return unless ($type_sequence);
    my $block_type = $rblock_type_of_seqno->{$type_sequence};
    return unless ($block_type);
    return
      unless ( $ok_to_add_semicolon_for_block_type{$block_type}
        || $block_type =~ /^(sub|package)/
        || $block_type =~ /^\w+\:$/ );

    # Find the most recent token in the new token list
    my $Kp = $self->K_previous_nonblank( undef, $rLL_new );
    return unless ( defined($Kp) );    # shouldn't happen except for bad input

    my $type_p          = $rLL_new->[$Kp]->[_TYPE_];
    my $token_p         = $rLL_new->[$Kp]->[_TOKEN_];
    my $type_sequence_p = $rLL_new->[$Kp]->[_TYPE_SEQUENCE_];

    # Do not add a semicolon if...
    return
      if (

        # it would follow a comment (and be isolated)
        $type_p eq '#'

        # it follows a code block ( because they are not always wanted
        # there and may add clutter)
        || $type_sequence_p && $rblock_type_of_seqno->{$type_sequence_p}

        # it would follow a label
        || $type_p eq 'J'

        # it would be inside a 'format' statement (and cause syntax error)
        || (   $type_p eq 'k'
            && $token_p =~ /format/ )

      );

    # Do not add a semicolon if it would impede a weld with an immediately
    # following closing token...like this
    #   { ( some code ) }
    #                  ^--No semicolon can go here

    # look at the previous token... note use of the _NEW rLL array here,
    # but sequence numbers are invariant.
    my $seqno_inner = $rLL_new->[$Kp]->[_TYPE_SEQUENCE_];

    # If it is also a CLOSING token we have to look closer...
    if (
           $seqno_inner
        && $is_closing_token{$token_p}

        # we only need to look if there is just one inner container..
        && defined( $rchildren_of_seqno->{$type_sequence} )
        && @{ $rchildren_of_seqno->{$type_sequence} } == 1
      )
    {

        # Go back and see if the corresponding two OPENING tokens are also
        # together.  Note that we are using the OLD K indexing here:
        my $K_outer_opening = $K_old_opening_by_seqno{$type_sequence};
        if ( defined($K_outer_opening) ) {
            my $K_nxt = $self->K_next_nonblank($K_outer_opening);
            if ( defined($K_nxt) ) {
                my $seqno_nxt = $rLL->[$K_nxt]->[_TYPE_SEQUENCE_];

                # Is the next token after the outer opening the same as
                # our inner closing (i.e. same sequence number)?
                # If so, do not insert a semicolon here.
                return if ( $seqno_nxt && $seqno_nxt == $seqno_inner );
            }
        }
    }

    # We will insert an empty semicolon here as a placeholder.  Later, if
    # it becomes the last token on a line, we will bring it to life.  The
    # advantage of doing this is that (1) we just have to check line
    # endings, and (2) the phantom semicolon has zero width and therefore
    # won't cause needless breaks of one-line blocks.
    my $Ktop = -1;
    if (   $rLL_new->[$Ktop]->[_TYPE_] eq 'b'
        && $want_left_space{';'} == WS_NO )
    {

        # convert the blank into a semicolon..
        # be careful: we are working on the new stack top
        # on a token which has been stored.
        my $rcopy = copy_token_as_type( $rLL_new->[$Ktop], 'b', SPACE );

        # Convert the existing blank to:
        #   a phantom semicolon for one_line_block option = 0 or 1
        #   a real semicolon    for one_line_block option = 2
        my $tok     = EMPTY_STRING;
        my $len_tok = 0;
        if ( $rOpts_one_line_block_semicolons == 2 ) {
            $tok     = ';';
            $len_tok = 1;
        }

        $rLL_new->[$Ktop]->[_TOKEN_]        = $tok;
        $rLL_new->[$Ktop]->[_TOKEN_LENGTH_] = $len_tok;
        $rLL_new->[$Ktop]->[_TYPE_]         = ';';

        $self->[_rtype_count_by_seqno_]->{$type_sequence}->{';'}++;

        # NOTE: we are changing the output stack without updating variables
        # $last_nonblank_code_type, etc. Future needs might require that
        # those variables be updated here.  For now, it seems ok to skip
        # this.

        # Then store a new blank
        $self->store_token($rcopy);
    }
    else {

        # Patch for issue c078: keep line indexes in order.  If the top
        # token is a space that we are keeping (due to '-wls=';') then
        # we have to check that old line indexes stay in order.
        # In very rare
        # instances in which side comments have been deleted and converted
        # into blanks, we may have filtered down multiple blanks into just
        # one. In that case the top blank may have a higher line number
        # than the previous nonblank token. Although the line indexes of
        # blanks are not really significant, we need to keep them in order
        # in order to pass error checks.
        if ( $rLL_new->[$Ktop]->[_TYPE_] eq 'b' ) {
            my $old_top_ix = $rLL_new->[$Ktop]->[_LINE_INDEX_];
            my $new_top_ix = $rLL_new->[$Kp]->[_LINE_INDEX_];
            if ( $new_top_ix < $old_top_ix ) {
                $rLL_new->[$Ktop]->[_LINE_INDEX_] = $new_top_ix;
            }
        }

        my $rcopy = copy_token_as_type( $rLL_new->[$Kp], ';', EMPTY_STRING );
        $self->store_token($rcopy);
    }
    return;
} ## end sub add_phantom_semicolon

sub add_trailing_comma {

    # Implement the --add-trailing-commas flag to the line end before index $KK:

    my ( $self, $KK, $Kfirst, $trailing_comma_rule ) = @_;

    # Input parameter:
    #  $KK = index of closing token in old ($rLL) token list
    #        which starts a new line and is not preceded by a comma
    #  $Kfirst = index of first token on the current line of input tokens
    #  $add_flags = user control flags

    # For example, we might want to add a comma here:

    #   bless {
    #           _name   => $name,
    #           _price  => $price,
    #           _rebate => $rebate  <------ location of possible bare comma
    #          }, $pkg;
    #          ^-------------------closing token at index $KK on new line

    # Do not add a comma if it would follow a comment
    my $Kp = $self->K_previous_nonblank( undef, $rLL_new );
    return unless ( defined($Kp) );
    my $type_p = $rLL_new->[$Kp]->[_TYPE_];
    return if ( $type_p eq '#' );

    # see if the user wants a trailing comma here
    my $match =
      $self->match_trailing_comma_rule( $KK, $Kfirst, $Kp,
        $trailing_comma_rule, 1 );

    # b1458 fix method 1: do not add if this would excess line length.
    # This is more general than fix method 2, below, but the logic is not
    # as clean. So this fix is currently deactivated.
    if ( 0 && $match && $rOpts_delete_trailing_commas && $KK > 0 ) {
        my $line_index     = $rLL->[ $KK - 1 ]->[_LINE_INDEX_];
        my $rlines         = $self->[_rlines_];
        my $line_of_tokens = $rlines->[$line_index];
        my $input_line     = $line_of_tokens->{_line_text};
        my $len =
            $length_function
          ? $length_function->($input_line) - 1
          : length($input_line) - 1;
        my $level   = $rLL->[$Kfirst]->[_LEVEL_];
        my $max_len = $maximum_line_length_at_level[$level];

        if ( $len >= $max_len ) {
            $match = 0;
        }
    }

    # if so, add a comma
    if ($match) {
        my $Knew = $self->store_new_token( ',', ',', $Kp );
    }

    return;

} ## end sub add_trailing_comma

sub delete_trailing_comma {

    my ( $self, $KK, $Kfirst, $trailing_comma_rule ) = @_;

    # Apply the --delete-trailing-commas flag to the comma before index $KK

    # Input parameter:
    #  $KK = index of a closing token in OLD ($rLL) token list
    #        which is preceded by a comma on the same line.
    #  $Kfirst = index of first token on the current line of input tokens
    #  $delete_option = user control flag

    # Returns true if the comma was deleted

    # For example, we might want to delete this comma:
    #    my @asset = ("FASMX", "FASGX", "FASIX",);
    #    |                                     |^--------token at index $KK
    #    |                                     ^------comma of interest
    #    ^-------------token at $Kfirst

    # Verify that the previous token is a comma.  Note that we are working in
    # the new token list $rLL_new.
    my $Kp = $self->K_previous_nonblank( undef, $rLL_new );
    return unless ( defined($Kp) );
    if ( $rLL_new->[$Kp]->[_TYPE_] ne ',' ) {

        # there must be a '#' between the ',' and closing token; give up.
        return;
    }

    # Do not delete commas when formatting under stress to avoid instability.
    # This fixes b1389, b1390, b1391, b1392.  The $high_stress_level has
    # been found to work well for trailing commas.
    if ( $rLL_new->[$Kp]->[_LEVEL_] >= $high_stress_level ) {
        return;
    }

    # See if the user wants this trailing comma
    my $match =
      $self->match_trailing_comma_rule( $KK, $Kfirst, $Kp,
        $trailing_comma_rule, 0 );

    # Patch: the --noadd-whitespace flag can cause instability in complex
    # structures. In this case do not delete the comma. Fixes b1409.
    if ( !$match && !$rOpts_add_whitespace ) {
        my $Kn = $self->K_next_nonblank($KK);
        if ( defined($Kn) ) {
            my $type_n = $rLL->[$Kn]->[_TYPE_];
            if ( $type_n ne ';' && $type_n ne '#' ) { return }
        }
    }

    # b1458 fix method 2: do not remove a comma after a leading brace type 'R'
    # since it is under stress and could become unstable. This is a more
    # specific fix but the logic is cleaner than method 1.
    if (  !$match
        && $rOpts_add_trailing_commas
        && $rLL->[$Kfirst]->[_TYPE_] eq 'R' )
    {

        # previous old token should be the comma..
        my $Kp_old = $self->K_previous_nonblank( $KK, $rLL );
        if (   defined($Kp_old)
            && $Kp_old > $Kfirst
            && $rLL->[$Kp_old]->[_TYPE_] eq ',' )
        {

            # if the comma follows the first token of the line ..
            my $Kpp_old = $self->K_previous_nonblank( $Kp_old, $rLL );
            if ( defined($Kpp_old) && $Kpp_old eq $Kfirst ) {

                # do not delete it
                $match = 1;
            }
        }
    }

    # If no match, delete it
    if ( !$match ) {

        return $self->unstore_last_nonblank_token(',');
    }
    return;

} ## end sub delete_trailing_comma

sub delete_weld_interfering_comma {

    my ( $self, $KK ) = @_;

    # Apply the flag '--delete-weld-interfering-commas' to the comma
    # before index $KK

    # Input parameter:
    #  $KK = index of a closing token in OLD ($rLL) token list
    #        which is preceded by a comma on the same line.

    # Returns true if the comma was deleted

    # For example, we might want to delete this comma:

    # my $tmpl = { foo => {no_override => 1, default => 42}, };
    #                                                     || ^------$KK
    #                                                     |^---$Kp
    #                                              $Kpp---^
    #
    # Note that:
    #  index $KK is in the old $rLL array, but
    #  indexes $Kp and $Kpp are in the new $rLL_new array.

    my $type_sequence = $rLL->[$KK]->[_TYPE_SEQUENCE_];
    return unless ($type_sequence);

    # Find the previous token and verify that it is a comma.
    my $Kp = $self->K_previous_nonblank( undef, $rLL_new );
    return unless ( defined($Kp) );
    if ( $rLL_new->[$Kp]->[_TYPE_] ne ',' ) {

        # it is not a comma, so give up ( it is probably a '#' )
        return;
    }

    # This must be the only comma in this list
    my $rtype_count = $self->[_rtype_count_by_seqno_]->{$type_sequence};
    return
      unless ( defined($rtype_count)
        && $rtype_count->{','}
        && $rtype_count->{','} == 1 );

    # Back up to the previous closing token
    my $Kpp = $self->K_previous_nonblank( $Kp, $rLL_new );
    return unless ( defined($Kpp) );
    my $seqno_pp = $rLL_new->[$Kpp]->[_TYPE_SEQUENCE_];
    my $type_pp  = $rLL_new->[$Kpp]->[_TYPE_];

    # The containers must be nesting (i.e., sequence numbers must differ by 1 )
    if ( $seqno_pp && $is_closing_type{$type_pp} ) {
        if ( $seqno_pp == $type_sequence + 1 ) {

            # remove the ',' from the top of the new token list
            return $self->unstore_last_nonblank_token(',');
        }
    }
    return;

} ## end sub delete_weld_interfering_comma

sub unstore_last_nonblank_token {

    my ( $self, $type ) = @_;

    # remove the most recent nonblank token from the new token list
    # Input parameter:
    #   $type = type to be removed (for safety check)

    # Returns true if success
    #         false if error

    # This was written and is used for removing commas, but might
    # be useful for other tokens. If it is ever used for other tokens
    # then the issue of what to do about the other variables, such
    # as token counts and the '$last...' vars needs to be considered.

    # Safety check, shouldn't happen
    if ( @{$rLL_new} < 3 ) {
        DEVEL_MODE && Fault("not enough tokens on stack to remove '$type'\n");
        return;
    }

    my ( $rcomma, $rblank );

    # case 1: pop comma from top of stack
    if ( $rLL_new->[-1]->[_TYPE_] eq $type ) {
        $rcomma = pop @{$rLL_new};
    }

    # case 2: pop blank and then comma from top of stack
    elsif ($rLL_new->[-1]->[_TYPE_] eq 'b'
        && $rLL_new->[-2]->[_TYPE_] eq $type )
    {
        $rblank = pop @{$rLL_new};
        $rcomma = pop @{$rLL_new};
    }

    # case 3: error, shouldn't happen unless bad call
    else {
        DEVEL_MODE && Fault("Could not find token type '$type' to remove\n");
        return;
    }

    # A note on updating vars set by sub store_token for this comma: If we
    # reduce the comma count by 1 then we also have to change the variable
    # $last_nonblank_code_type to be $last_last_nonblank_code_type because
    # otherwise sub store_token is going to ALSO reduce the comma count.
    # Alternatively, we can leave the count alone and the
    # $last_nonblank_code_type alone. Then sub store_token will produce
    # the correct result. This is simpler and is done here.

    # Now add a blank space after the comma if appropriate.
    # Some unusual spacing controls might need another iteration to
    # reach a final state.
    if ( $rLL_new->[-1]->[_TYPE_] ne 'b' ) {
        if ( defined($rblank) ) {
            $rblank->[_CUMULATIVE_LENGTH_] -= 1;    # fix for deleted comma
            push @{$rLL_new}, $rblank;
        }
    }
    return 1;
} ## end sub unstore_last_nonblank_token

sub match_trailing_comma_rule {

    my ( $self, $KK, $Kfirst, $Kp, $trailing_comma_rule, $if_add ) = @_;

    # Decide if a trailing comma rule is matched.

    # Input parameter:
    #  $KK = index of closing token in old ($rLL) token list which follows
    #    the location of a possible trailing comma. See diagram below.
    #  $Kfirst = (old) index of first token on the current line of input tokens
    #  $Kp = index of previous nonblank token in new ($rLL_new) array
    #  $trailing_comma_rule = packed user control flags
    #  $if_add = true if adding comma, false if deleting comma

    # Returns:
    #   false if no match
    #   true  if match

    # For example, we might be checking for addition of a comma here:

    #   bless {
    #           _name   => $name,
    #           _price  => $price,
    #           _rebate => $rebate  <------ location of possible trailing comma
    #          }, $pkg;
    #          ^-------------------closing token at index $KK

    return unless ($trailing_comma_rule);
    my ( $trailing_comma_style, $paren_flag ) = @{$trailing_comma_rule};

    # List of $trailing_comma_style values:
    #   undef  stable: do not change
    #   '0' : no list should have a trailing comma
    #   '1' or '*' : every list should have a trailing comma
    #   'm' a multi-line list should have a trailing commas
    #   'b' trailing commas should be 'bare' (comma followed by newline)
    #   'h' lists of key=>value pairs with a bare trailing comma
    #   'i' same as s=h but also include any list with no more than about one
    #       comma per line
    #   ' ' or -wtc not defined : leave trailing commas unchanged [DEFAULT].

    # Note: an interesting generalization would be to let an upper case
    # letter denote the negation of styles 'm', 'b', 'h', 'i'. This might
    # be useful for undoing operations. It would be implemented as a wrapper
    # around this routine.

    #-----------------------------------------
    #  No style defined : do not add or delete
    #-----------------------------------------
    if ( !defined($trailing_comma_style) ) { return !$if_add }

    #----------------------------------------
    # Set some flags describing this location
    #----------------------------------------
    my $type_sequence = $rLL->[$KK]->[_TYPE_SEQUENCE_];
    return unless ($type_sequence);
    my $closing_token = $rLL->[$KK]->[_TOKEN_];
    my $rtype_count   = $self->[_rtype_count_by_seqno_]->{$type_sequence};
    return unless ( defined($rtype_count) && $rtype_count->{','} );
    my $is_permanently_broken =
      $self->[_ris_permanently_broken_]->{$type_sequence};

    # Note that _ris_broken_container_ also stores the line diff
    # but it is not available at this early stage.
    my $K_opening = $self->[_K_opening_container_]->{$type_sequence};
    return if ( !defined($K_opening) );

    # multiline definition 1: opening and closing tokens on different lines
    my $iline_o                  = $rLL_new->[$K_opening]->[_LINE_INDEX_];
    my $iline_c                  = $rLL->[$KK]->[_LINE_INDEX_];
    my $line_diff_containers     = $iline_c - $iline_o;
    my $has_multiline_containers = $line_diff_containers > 0;

    # multiline definition 2: first and last commas on different lines
    my $iline_first = $self->[_rfirst_comma_line_index_]->{$type_sequence};
    my $iline_last  = $rLL_new->[$Kp]->[_LINE_INDEX_];
    my $has_multiline_commas;
    my $line_diff_commas = 0;
    if ( !defined($iline_first) ) {

        # shouldn't happen if caller checked comma count
        my $type_kp = $rLL_new->[$Kp]->[_TYPE_];
        Fault(
"at line $iline_last but line of first comma not defined, at Kp=$Kp, type=$type_kp\n"
        ) if (DEVEL_MODE);
    }
    else {
        $line_diff_commas     = $iline_last - $iline_first;
        $has_multiline_commas = $line_diff_commas > 0;
    }

    # To avoid instability in edge cases, when adding commas we uses the
    # multiline_commas definition, but when deleting we use multiline
    # containers.  This fixes b1384, b1396, b1397, b1398, b1400.
    my $is_multiline =
      $if_add ? $has_multiline_commas : $has_multiline_containers;

    my $is_bare_multiline_comma = $is_multiline && $KK == $Kfirst;

    my $match;

    #----------------------------
    # 0 : does not match any list
    #----------------------------
    if ( $trailing_comma_style eq '0' ) {
        $match = 0;
    }

    #------------------------------
    # '*' or '1' : matches any list
    #------------------------------
    elsif ( $trailing_comma_style eq '*' || $trailing_comma_style eq '1' ) {
        $match = 1;
    }

    #-----------------------------
    # 'm' matches a Multiline list
    #-----------------------------
    elsif ( $trailing_comma_style eq 'm' ) {
        $match = $is_multiline;
    }

    #----------------------------------
    # 'b' matches a Bare trailing comma
    #----------------------------------
    elsif ( $trailing_comma_style eq 'b' ) {
        $match = $is_bare_multiline_comma;
    }

    #--------------------------------------------------------------------------
    # 'h' matches a bare hash list with about 1 comma and 1 fat comma per line.
    # 'i' matches a bare stable list with about 1 comma per line.
    #--------------------------------------------------------------------------
    elsif ( $trailing_comma_style eq 'h' || $trailing_comma_style eq 'i' ) {

        # We can treat these together because they are similar.
        # The set of 'i' matches includes the set of 'h' matches.

        # the trailing comma must be bare for both 'h' and 'i'
        return if ( !$is_bare_multiline_comma );

        # There must be no more than one comma per line for both 'h' and 'i'
        # The new_comma_count here will include the trailing comma.
        my $new_comma_count = $rtype_count->{','};
        $new_comma_count += 1 if ($if_add);
        my $excess_commas = $new_comma_count - $line_diff_commas - 1;
        if ( $excess_commas > 0 ) {

            # Exception for a special edge case for option 'i': if the trailing
            # comma is followed by a blank line or comment, then it cannot be
            # covered.  Then we can safely accept a small list to avoid
            # instability (issue b1443).
            if (   $trailing_comma_style eq 'i'
                && $iline_c - $rLL_new->[$Kp]->[_LINE_INDEX_] > 1
                && $new_comma_count <= 2 )
            {
                $match = 1;
            }

            # Patch for instability issue b1456: -boc can trick this test; so
            # skip it when deleting commas to avoid possible instability
            # with option 'h' in combination with -atc -dtc -boc;
            elsif (
                $trailing_comma_style eq 'h'

                # this is a deletion (due to -dtc)
                && !$if_add

                # -atc is also set
                && $rOpts_add_trailing_commas

                # -boc is set and active
                && $rOpts_break_at_old_comma_breakpoints
                && !$rOpts_ignore_old_breakpoints
              )
            {
                # ignore this test
            }

            else {
                return;
            }
        }

        # a list of key=>value pairs with at least 2 fat commas is a match
        # for both 'h' and 'i'
        my $fat_comma_count = $rtype_count->{'=>'};
        if ( !$match && $fat_comma_count && $fat_comma_count >= 2 ) {

            # comma count (including trailer) and fat comma count must differ by
            # by no more than 1. This allows for some small variations.
            my $comma_diff = $new_comma_count - $fat_comma_count;
            $match = ( $comma_diff >= -1 && $comma_diff <= 1 );
        }

        # For 'i' only, a list that can be shown to be stable is a match
        if ( !$match && $trailing_comma_style eq 'i' ) {
            $match = (
                $is_permanently_broken
                  || ( $rOpts_break_at_old_comma_breakpoints
                    && !$rOpts_ignore_old_breakpoints )
            );
        }
    }

    #-------------------------------------------------------------------------
    # Unrecognized parameter. This should have been caught in the input check.
    #-------------------------------------------------------------------------
    else {

        DEVEL_MODE && Fault("Unrecognized parameter '$trailing_comma_style'\n");

        # do not add or delete
        return !$if_add;
    }

    # Now do any special paren check
    if (   $match
        && $paren_flag
        && $paren_flag ne '1'
        && $paren_flag ne '*'
        && $closing_token eq ')' )
    {
        $match &&=
          $self->match_paren_control_flag( $type_sequence, $paren_flag,
            $rLL_new );
    }

    # Fix for b1379, b1380, b1381, b1382, b1384 part 1. Mark trailing commas
    # for use by -vtc logic to avoid instability when -dtc and -atc are both
    # active.
    if ($match) {
        if ( $if_add && $rOpts_delete_trailing_commas
            || !$if_add && $rOpts_add_trailing_commas )
        {
            $self->[_ris_bare_trailing_comma_by_seqno_]->{$type_sequence} = 1;

            # The combination of -atc and -dtc and -cab=3 can be unstable
            # (b1394). So we deactivate -cab=3 in this case.
            # A value of '0' or '4' is required for stability of case b1451.
            if ( $rOpts_comma_arrow_breakpoints == 3 ) {
                $self->[_roverride_cab3_]->{$type_sequence} = 0;
            }
        }
    }
    return $match;
} ## end sub match_trailing_comma_rule

sub store_new_token {

    my ( $self, $type, $token, $Kp ) = @_;

    # Create and insert a completely new token into the output stream

    # Input parameters:
    #  $type  = the token type
    #  $token = the token text
    #  $Kp    = index of the previous token in the new list, $rLL_new

    # Returns:
    #  $Knew = index in $rLL_new of the new token

    # This operation is a little tricky because we are creating a new token and
    # we have to take care to follow the requested whitespace rules.

    my $Ktop         = @{$rLL_new} - 1;
    my $top_is_space = $Ktop >= 0 && $rLL_new->[$Ktop]->[_TYPE_] eq 'b';
    my $Knew;
    if ( $top_is_space && $want_left_space{$type} == WS_NO ) {

        #----------------------------------------------------
        # Method 1: Convert the top blank into the new token.
        #----------------------------------------------------

        # Be Careful: we are working on the top of the new stack, on a token
        # which has been stored.

        my $rcopy = copy_token_as_type( $rLL_new->[$Ktop], 'b', SPACE );

        $Knew                               = $Ktop;
        $rLL_new->[$Knew]->[_TOKEN_]        = $token;
        $rLL_new->[$Knew]->[_TOKEN_LENGTH_] = length($token);
        $rLL_new->[$Knew]->[_TYPE_]         = $type;

        # NOTE: we are changing the output stack without updating variables
        # $last_nonblank_code_type, etc. Future needs might require that
        # those variables be updated here.  For now, we just update the
        # type counts as necessary.

        if ( $is_counted_type{$type} ) {
            my $seqno = $seqno_stack{ $depth_next - 1 };
            if ($seqno) {
                $self->[_rtype_count_by_seqno_]->{$seqno}->{$type}++;
            }
        }

        # Then store a new blank
        $self->store_token($rcopy);
    }
    else {

        #----------------------------------------
        # Method 2: Use the normal storage method
        #----------------------------------------

        # Patch for issue c078: keep line indexes in order.  If the top
        # token is a space that we are keeping (due to '-wls=...) then
        # we have to check that old line indexes stay in order.
        # In very rare
        # instances in which side comments have been deleted and converted
        # into blanks, we may have filtered down multiple blanks into just
        # one. In that case the top blank may have a higher line number
        # than the previous nonblank token. Although the line indexes of
        # blanks are not really significant, we need to keep them in order
        # in order to pass error checks.
        if ($top_is_space) {
            my $old_top_ix = $rLL_new->[$Ktop]->[_LINE_INDEX_];
            my $new_top_ix = $rLL_new->[$Kp]->[_LINE_INDEX_];
            if ( $new_top_ix < $old_top_ix ) {
                $rLL_new->[$Ktop]->[_LINE_INDEX_] = $new_top_ix;
            }
        }

        my $rcopy = copy_token_as_type( $rLL_new->[$Kp], $type, $token );
        $self->store_token($rcopy);
        $Knew = @{$rLL_new} - 1;
    }
    return $Knew;
} ## end sub store_new_token

sub check_Q {

    # Check that a quote looks okay, and report possible problems
    # to the logfile.

    my ( $self, $KK, $Kfirst, $line_number ) = @_;
    my $token = $rLL->[$KK]->[_TOKEN_];
    if ( $token =~ /\t/ ) {
        $self->note_embedded_tab($line_number);
    }

    # The remainder of this routine looks for something like
    #        '$var = s/xxx/yyy/;'
    # in case it should have been '$var =~ s/xxx/yyy/;'

    # Start by looking for a token beginning with one of: s y m / tr
    return
      unless ( $is_s_y_m_slash{ substr( $token, 0, 1 ) }
        || substr( $token, 0, 2 ) eq 'tr' );

    # ... and preceded by one of: = == !=
    my $Kp = $self->K_previous_nonblank( undef, $rLL_new );
    return unless ( defined($Kp) );
    my $previous_nonblank_type = $rLL_new->[$Kp]->[_TYPE_];
    return unless ( $is_unexpected_equals{$previous_nonblank_type} );
    my $previous_nonblank_token = $rLL_new->[$Kp]->[_TOKEN_];

    my $previous_nonblank_type_2  = 'b';
    my $previous_nonblank_token_2 = EMPTY_STRING;
    my $Kpp                       = $self->K_previous_nonblank( $Kp, $rLL_new );
    if ( defined($Kpp) ) {
        $previous_nonblank_type_2  = $rLL_new->[$Kpp]->[_TYPE_];
        $previous_nonblank_token_2 = $rLL_new->[$Kpp]->[_TOKEN_];
    }

    my $next_nonblank_token = EMPTY_STRING;
    my $Kn                  = $KK + 1;
    my $Kmax                = @{$rLL} - 1;
    if ( $Kn <= $Kmax && $rLL->[$Kn]->[_TYPE_] eq 'b' ) { $Kn += 1 }
    if ( $Kn <= $Kmax ) {
        $next_nonblank_token = $rLL->[$Kn]->[_TOKEN_];
    }

    my $token_0 = $rLL->[$Kfirst]->[_TOKEN_];
    my $type_0  = $rLL->[$Kfirst]->[_TYPE_];

    if (

        # preceded by simple scalar
        $previous_nonblank_type_2 eq 'i'
        && $previous_nonblank_token_2 =~ /^\$/

        # followed by some kind of termination
        # (but give complaint if we can not see far enough ahead)
        && $next_nonblank_token =~ /^[; \)\}]$/

        # scalar is not declared
        ##                      =~ /^(my|our|local)$/
        && !( $type_0 eq 'k' && $is_my_our_local{$token_0} )
      )
    {
        my $lno   = 1 + $rLL_new->[$Kp]->[_LINE_INDEX_];
        my $guess = substr( $previous_nonblank_token, 0, 1 ) . '~';
        complain(
"Line $lno: Note: be sure you want '$previous_nonblank_token' instead of '$guess' here\n"
        );
    }
    return;
} ## end sub check_Q

} ## end closure respace_tokens

sub copy_token_as_type {

    # This provides a quick way to create a new token by
    # slightly modifying an existing token.
    my ( $rold_token, $type, $token ) = @_;
    if ( !defined($token) ) {
        if ( $type eq 'b' ) {
            $token = SPACE;
        }
        elsif ( $type eq 'q' ) {
            $token = EMPTY_STRING;
        }
        elsif ( $type eq '->' ) {
            $token = '->';
        }
        elsif ( $type eq ';' ) {
            $token = ';';
        }
        elsif ( $type eq ',' ) {
            $token = ',';
        }
        else {

            # Unexpected type ... this sub will work as long as both $token and
            # $type are defined, but we should catch any unexpected types during
            # development.
            if (DEVEL_MODE) {
                Fault(<<EOM);
sub 'copy_token_as_type' received token type '$type' but expects just one of: 'b' 'q' '->' or ';'
EOM
            }

            # Shouldn't get here
            $token = $type;
        }
    }

    my @rnew_token = @{$rold_token};
    $rnew_token[_TYPE_]          = $type;
    $rnew_token[_TOKEN_]         = $token;
    $rnew_token[_TYPE_SEQUENCE_] = EMPTY_STRING;
    return \@rnew_token;
} ## end sub copy_token_as_type

sub K_next_code {
    my ( $self, $KK, $rLL ) = @_;

    # return the index K of the next nonblank, non-comment token
    return if ( !defined($KK) );
    return if ( $KK < 0 );

    # use the standard array unless given otherwise
    $rLL = $self->[_rLL_] if ( !defined($rLL) );
    my $Num  = @{$rLL};
    my $Knnb = $KK + 1;
    while ( $Knnb < $Num ) {
        if ( !defined( $rLL->[$Knnb] ) ) {

            # We seem to have encountered a gap in our array.
            # This shouldn't happen because sub write_line() pushed
            # items into the $rLL array.
            Fault("Undefined entry for k=$Knnb") if (DEVEL_MODE);
            return;
        }
        if (   $rLL->[$Knnb]->[_TYPE_] ne 'b'
            && $rLL->[$Knnb]->[_TYPE_] ne '#' )
        {
            return $Knnb;
        }
        $Knnb++;
    }
    return;
} ## end sub K_next_code

sub K_next_nonblank {
    my ( $self, $KK, $rLL ) = @_;

    # return the index K of the next nonblank token, or
    # return undef if none
    return if ( !defined($KK) );
    return if ( $KK < 0 );

    # The third arg allows this routine to be used on any array.  This is
    # useful in sub respace_tokens when we are copying tokens from an old $rLL
    # to a new $rLL array.  But usually the third arg will not be given and we
    # will just use the $rLL array in $self.
    $rLL = $self->[_rLL_] if ( !defined($rLL) );
    my $Num  = @{$rLL};
    my $Knnb = $KK + 1;
    return       if ( $Knnb >= $Num );
    return $Knnb if ( $rLL->[$Knnb]->[_TYPE_] ne 'b' );
    return       if ( ++$Knnb >= $Num );
    return $Knnb if ( $rLL->[$Knnb]->[_TYPE_] ne 'b' );

    # Backup loop. Very unlikely to get here; it means we have neighboring
    # blanks in the token stream.
    $Knnb++;
    while ( $Knnb < $Num ) {

        # Safety check, this fault shouldn't happen:  The $rLL array is the
        # main array of tokens, so all entries should be used.  It is
        # initialized in sub write_line, and then re-initialized by sub
        # store_token() within sub respace_tokens.  Tokens are pushed on
        # so there shouldn't be any gaps.
        if ( !defined( $rLL->[$Knnb] ) ) {
            Fault("Undefined entry for k=$Knnb") if (DEVEL_MODE);
            return;
        }
        if ( $rLL->[$Knnb]->[_TYPE_] ne 'b' ) { return $Knnb }
        $Knnb++;
    }
    return;
} ## end sub K_next_nonblank

sub K_previous_code {

    # return the index K of the previous nonblank, non-comment token
    # Call with $KK=undef to start search at the top of the array
    my ( $self, $KK, $rLL ) = @_;

    # use the standard array unless given otherwise
    $rLL = $self->[_rLL_] unless ( defined($rLL) );
    my $Num = @{$rLL};
    if ( !defined($KK) ) { $KK = $Num }

    if ( $KK > $Num ) {

        # This fault can be caused by a programming error in which a bad $KK is
        # given.  The caller should make the first call with KK_new=undef to
        # avoid this error.
        Fault(
"Program Bug: K_previous_nonblank_new called with K=$KK which exceeds $Num"
        ) if (DEVEL_MODE);
        return;
    }
    my $Kpnb = $KK - 1;
    while ( $Kpnb >= 0 ) {
        if (   $rLL->[$Kpnb]->[_TYPE_] ne 'b'
            && $rLL->[$Kpnb]->[_TYPE_] ne '#' )
        {
            return $Kpnb;
        }
        $Kpnb--;
    }
    return;
} ## end sub K_previous_code

sub K_previous_nonblank {

    # return index of previous nonblank token before item K;
    # Call with $KK=undef to start search at the top of the array
    my ( $self, $KK, $rLL ) = @_;

    # use the standard array unless given otherwise
    $rLL = $self->[_rLL_] unless ( defined($rLL) );
    my $Num = @{$rLL};
    if ( !defined($KK) ) { $KK = $Num }
    if ( $KK > $Num ) {

        # This fault can be caused by a programming error in which a bad $KK is
        # given.  The caller should make the first call with KK_new=undef to
        # avoid this error.
        Fault(
"Program Bug: K_previous_nonblank_new called with K=$KK which exceeds $Num"
        ) if (DEVEL_MODE);
        return;
    }
    my $Kpnb = $KK - 1;
    return       if ( $Kpnb < 0 );
    return $Kpnb if ( $rLL->[$Kpnb]->[_TYPE_] ne 'b' );
    return       if ( --$Kpnb < 0 );
    return $Kpnb if ( $rLL->[$Kpnb]->[_TYPE_] ne 'b' );

    # Backup loop. We should not get here unless some routine
    # slipped repeated blanks into the token stream.
    return if ( --$Kpnb < 0 );
    while ( $Kpnb >= 0 ) {
        if ( $rLL->[$Kpnb]->[_TYPE_] ne 'b' ) { return $Kpnb }
        $Kpnb--;
    }
    return;
} ## end sub K_previous_nonblank

sub parent_seqno_by_K {

    # Return the sequence number of the parent container of token K, if any.

    my ( $self, $KK ) = @_;
    my $rLL = $self->[_rLL_];

    # The task is to jump forward to the next container token
    # and use the sequence number of either it or its parent.

    # For example, consider the following with seqno=5 of the '[' and ']'
    # being called with index K of the first token of each line:

    #                                              # result
    #    push @tests,                              # -
    #      [                                       # -
    #        sub { 99 },   'do {&{%s} for 1,2}',   # 5
    #        '(&{})(&{})', undef,                  # 5
    #        [ 2, 2, 0 ],  0                       # 5
    #      ];                                      # -

    # NOTE: The ending parent will be SEQ_ROOT for a balanced file.  For
    # unbalanced files, last sequence number will either be undefined or it may
    # be at a deeper level.  In either case we will just return SEQ_ROOT to
    # have a defined value and allow formatting to proceed.
    my $parent_seqno  = SEQ_ROOT;
    my $type_sequence = $rLL->[$KK]->[_TYPE_SEQUENCE_];
    if ($type_sequence) {
        $parent_seqno = $self->[_rparent_of_seqno_]->{$type_sequence};
    }
    else {
        my $Kt = $rLL->[$KK]->[_KNEXT_SEQ_ITEM_];
        if ( defined($Kt) ) {
            $type_sequence = $rLL->[$Kt]->[_TYPE_SEQUENCE_];
            my $type = $rLL->[$Kt]->[_TYPE_];

            # if next container token is closing, it is the parent seqno
            if ( $is_closing_type{$type} ) {
                $parent_seqno = $type_sequence;
            }

            # otherwise we want its parent container
            else {
                $parent_seqno = $self->[_rparent_of_seqno_]->{$type_sequence};
            }
        }
    }
    $parent_seqno = SEQ_ROOT if ( !defined($parent_seqno) );
    return $parent_seqno;
} ## end sub parent_seqno_by_K

sub is_in_block_by_i {
    my ( $self, $i ) = @_;

    # returns true if
    #     token at i is contained in a BLOCK
    #     or is at root level
    #     or there is some kind of error (i.e. unbalanced file)
    # returns false otherwise

    if ( $i < 0 ) {
        DEVEL_MODE && Fault("Bad call, i='$i'\n");
        return 1;
    }

    my $seqno = $parent_seqno_to_go[$i];
    return 1 if ( !$seqno || $seqno eq SEQ_ROOT );
    return 1 if ( $self->[_rblock_type_of_seqno_]->{$seqno} );
    return;
} ## end sub is_in_block_by_i

sub is_in_list_by_i {
    my ( $self, $i ) = @_;

    # returns true if token at i is contained in a LIST
    # returns false otherwise
    my $seqno = $parent_seqno_to_go[$i];
    return if ( !$seqno );
    return if ( $seqno eq SEQ_ROOT );
    if ( $self->[_ris_list_by_seqno_]->{$seqno} ) {
        return 1;
    }
    return;
} ## end sub is_in_list_by_i

sub is_list_by_K {

    # Return true if token K is in a list
    my ( $self, $KK ) = @_;

    my $parent_seqno = $self->parent_seqno_by_K($KK);
    return unless defined($parent_seqno);
    return $self->[_ris_list_by_seqno_]->{$parent_seqno};
} ## end sub is_list_by_K

sub is_list_by_seqno {

    # Return true if the immediate contents of a container appears to be a
    # list.
    my ( $self, $seqno ) = @_;
    return unless defined($seqno);
    return $self->[_ris_list_by_seqno_]->{$seqno};
} ## end sub is_list_by_seqno

sub resync_lines_and_tokens {

    my $self = shift;

    # Re-construct the arrays of tokens associated with the original input
    # lines since they have probably changed due to inserting and deleting
    # blanks and a few other tokens.

    # Return parameters:
    # set severe_error = true if processing needs to terminate
    my $severe_error;
    my $rqw_lines = [];

    my $rLL    = $self->[_rLL_];
    my $Klimit = $self->[_Klimit_];
    my $rlines = $self->[_rlines_];
    my @Krange_code_without_comments;
    my @Klast_valign_code;

    # This is the next token and its line index:
    my $Knext = 0;
    my $Kmax  = defined($Klimit) ? $Klimit : -1;

    # Verify that old line indexes are in still order.  If this error occurs,
    # check locations where sub 'respace_tokens' creates new tokens (like
    # blank spaces).  It must have set a bad old line index.
    if ( DEVEL_MODE && defined($Klimit) ) {
        my $iline = $rLL->[0]->[_LINE_INDEX_];
        foreach my $KK ( 1 .. $Klimit ) {
            my $iline_last = $iline;
            $iline = $rLL->[$KK]->[_LINE_INDEX_];
            if ( $iline < $iline_last ) {
                my $KK_m    = $KK - 1;
                my $token_m = $rLL->[$KK_m]->[_TOKEN_];
                my $token   = $rLL->[$KK]->[_TOKEN_];
                my $type_m  = $rLL->[$KK_m]->[_TYPE_];
                my $type    = $rLL->[$KK]->[_TYPE_];
                Fault(<<EOM);
Line indexes out of order at index K=$KK:
at KK-1 =$KK_m: old line=$iline_last, type='$type_m', token='$token_m'
at KK   =$KK: old line=$iline, type='$type', token='$token',
EOM
            }
        }
    }

    my $iline = -1;
    foreach my $line_of_tokens ( @{$rlines} ) {
        $iline++;
        my $line_type = $line_of_tokens->{_line_type};
        if ( $line_type eq 'CODE' ) {

            # Get the old number of tokens on this line
            my $rK_range_old = $line_of_tokens->{_rK_range};
            my ( $Kfirst_old, $Klast_old ) = @{$rK_range_old};
            my $Kdiff_old = 0;
            if ( defined($Kfirst_old) ) {
                $Kdiff_old = $Klast_old - $Kfirst_old;
            }

            # Find the range of NEW K indexes for the line:
            # $Kfirst = index of first token on line
            # $Klast  = index of last token on line
            my ( $Kfirst, $Klast );

            my $Knext_beg = $Knext;    # this will be $Kfirst if we find tokens

            # Optimization: Although the actual K indexes may be completely
            # changed after respacing, the number of tokens on any given line
            # will often be nearly unchanged.  So we will see if we can start
            # our search by guessing that the new line has the same number
            # of tokens as the old line.
            my $Knext_guess = $Knext + $Kdiff_old;
            if (   $Knext_guess > $Knext
                && $Knext_guess < $Kmax
                && $rLL->[$Knext_guess]->[_LINE_INDEX_] <= $iline )
            {

                # the guess is good, so we can start our search here
                $Knext = $Knext_guess + 1;
            }

            while ($Knext <= $Kmax
                && $rLL->[$Knext]->[_LINE_INDEX_] <= $iline )
            {
                $Knext++;
            }

            if ( $Knext > $Knext_beg ) {

                $Klast = $Knext - 1;

                # Delete any terminal blank token
                if ( $rLL->[$Klast]->[_TYPE_] eq 'b' ) { $Klast -= 1 }

                if ( $Klast < $Knext_beg ) {
                    $Klast = undef;
                }
                else {

                    $Kfirst = $Knext_beg;

                    # Save ranges of non-comment code. This will be used by
                    # sub keep_old_line_breaks.
                    if ( $rLL->[$Kfirst]->[_TYPE_] ne '#' ) {
                        push @Krange_code_without_comments, [ $Kfirst, $Klast ];
                    }

                    # Only save ending K indexes of code types which are blank
                    # or 'VER'.  These will be used for a convergence check.
                    # See related code in sub 'convey_batch_to_vertical_aligner'
                    my $CODE_type = $line_of_tokens->{_code_type};
                    if (  !$CODE_type
                        || $CODE_type eq 'VER' )
                    {
                        push @Klast_valign_code, $Klast;
                    }
                }
            }

            # It is only safe to trim the actual line text if the input
            # line had a terminal blank token. Otherwise, we may be
            # in a quote.
            if ( $line_of_tokens->{_ended_in_blank_token} ) {
                $line_of_tokens->{_line_text} =~ s/\s+$//;
            }
            $line_of_tokens->{_rK_range} = [ $Kfirst, $Klast ];

            # Deleting semicolons can create new empty code lines
            # which should be marked as blank
            if ( !defined($Kfirst) ) {
                my $CODE_type = $line_of_tokens->{_code_type};
                if ( !$CODE_type ) {
                    $line_of_tokens->{_code_type} = 'BL';
                }
            }
            else {

                #---------------------------------------------------
                # save indexes of all lines with a 'q' at either end
                # for later use by sub find_multiline_qw
                #---------------------------------------------------
                if (   $rLL->[$Kfirst]->[_TYPE_] eq 'q'
                    || $rLL->[$Klast]->[_TYPE_] eq 'q' )
                {
                    push @{$rqw_lines}, $iline;
                }
            }
        }
    }

    # There shouldn't be any nodes beyond the last one.  This routine is
    # relinking lines and tokens after the tokens have been respaced.  A fault
    # here indicates some kind of bug has been introduced into the above loops.
    # There is not good way to keep going; we better stop here.
    if ( $Knext <= $Kmax ) {
        Fault_Warn(
            "unexpected tokens at end of file when reconstructing lines");
        $severe_error = 1;
        return ( $severe_error, $rqw_lines );
    }
    $self->[_rKrange_code_without_comments_] = \@Krange_code_without_comments;

    # Setup the convergence test in the FileWriter based on line-ending indexes
    my $file_writer_object = $self->[_file_writer_object_];
    $file_writer_object->setup_convergence_test( \@Klast_valign_code );

    return ( $severe_error, $rqw_lines );

} ## end sub resync_lines_and_tokens

sub check_for_old_break {
    my ( $self, $KK, $rkeep_break_hash, $rbreak_hash ) = @_;

    # This sub is called to help implement flags:
    # --keep-old-breakpoints-before and --keep-old-breakpoints-after
    # Given:
    #   $KK               = index of a token,
    #   $rkeep_break_hash = user control for --keep-old-...
    #   $rbreak_hash      = hash of tokens where breaks are requested
    # Set $rbreak_hash as follows if a user break is requested:
    #    = 1 make a hard break (flush the current batch)
    #        best for something like leading commas (-kbb=',')
    #    = 2 make a soft break (keep building current batch)
    #        best for something like leading ->

    my $rLL = $self->[_rLL_];

    my $seqno = $rLL->[$KK]->[_TYPE_SEQUENCE_];

    # non-container tokens use the type as the key
    if ( !$seqno ) {
        my $type = $rLL->[$KK]->[_TYPE_];
        if ( $rkeep_break_hash->{$type} ) {
            $rbreak_hash->{$KK} = $is_soft_keep_break_type{$type} ? 2 : 1;
        }
    }

    # container tokens use the token as the key
    else {
        my $token = $rLL->[$KK]->[_TOKEN_];
        my $flag  = $rkeep_break_hash->{$token};
        if ($flag) {

            my $match = $flag eq '1' || $flag eq '*';

            # check for special matching codes
            if ( !$match ) {
                if ( $token eq '(' || $token eq ')' ) {
                    $match = $self->match_paren_control_flag( $seqno, $flag );
                }
                elsif ( $token eq '{' || $token eq '}' ) {

                    # These tentative codes 'b' and 'B' for brace types are
                    # placeholders for possible future brace types. They
                    # are not documented and may be changed.
                    my $block_type = $self->[_rblock_type_of_seqno_]->{$seqno};
                    if    ( $flag eq 'b' ) { $match = $block_type }
                    elsif ( $flag eq 'B' ) { $match = !$block_type }
                    else {
                        # unknown code - no match
                    }
                }
                else {
                    ## ok: none of the above
                }
            }
            if ($match) {
                my $type = $rLL->[$KK]->[_TYPE_];
                $rbreak_hash->{$KK} = $is_soft_keep_break_type{$type} ? 2 : 1;
            }
        }
    }
    return;
} ## end sub check_for_old_break

sub keep_old_line_breaks {

    # Called once per file to find and mark any old line breaks which
    # should be kept.  We will be translating the input hashes into
    # token indexes.

    # A flag is set as follows:
    # = 1 make a hard break (flush the current batch)
    #     best for something like leading commas (-kbb=',')
    # = 2 make a soft break (keep building current batch)
    #     best for something like leading ->

    my ($self) = @_;

    my $rLL = $self->[_rLL_];
    my $rKrange_code_without_comments =
      $self->[_rKrange_code_without_comments_];
    my $rbreak_before_Kfirst = $self->[_rbreak_before_Kfirst_];
    my $rbreak_after_Klast   = $self->[_rbreak_after_Klast_];
    my $rbreak_container     = $self->[_rbreak_container_];

    #----------------------------------------
    # Apply --break-at-old-method-breakpoints
    #----------------------------------------

    # This code moved here from sub break_lists to fix b1120
    if ( $rOpts->{'break-at-old-method-breakpoints'} ) {
        foreach my $item ( @{$rKrange_code_without_comments} ) {
            my ( $Kfirst, $Klast ) = @{$item};
            my $type  = $rLL->[$Kfirst]->[_TYPE_];
            my $token = $rLL->[$Kfirst]->[_TOKEN_];

            # leading '->' use a value of 2 which causes a soft
            # break rather than a hard break
            if ( $type eq '->' ) {
                $rbreak_before_Kfirst->{$Kfirst} = 2;
            }

            # leading ')->' use a special flag to insure that both
            # opening and closing parens get opened
            # Fix for b1120: only for parens, not braces
            elsif ( $token eq ')' ) {
                my $Kn = $self->K_next_nonblank($Kfirst);
                next if ( !defined($Kn) );
                next if ( $Kn > $Klast );
                next if ( $rLL->[$Kn]->[_TYPE_] ne '->' );
                my $seqno = $rLL->[$Kfirst]->[_TYPE_SEQUENCE_];
                next if ( !$seqno );

                # Note: in previous versions there was a fix here to avoid
                # instability between conflicting -bom and -pvt or -pvtc flags.
                # The fix skipped -bom for a small line difference.  But this
                # was troublesome, and instead the fix has been moved to
                # sub set_vertical_tightness_flags where priority is given to
                # the -bom flag over -pvt and -pvtc flags.  Both opening and
                # closing paren flags are involved because even though -bom only
                # requests breaking before the closing paren, automated logic
                # opens the opening paren when the closing paren opens.
                # Relevant cases are b977, b1215, b1270, b1303

                $rbreak_container->{$seqno} = 1;
            }
            else {
                ## ok: not a special case
            }
        }
    }

    #---------------------------------------------------------------------
    # Apply --keep-old-breakpoints-before and --keep-old-breakpoints-after
    #---------------------------------------------------------------------

    return unless ( %keep_break_before_type || %keep_break_after_type );

    foreach my $item ( @{$rKrange_code_without_comments} ) {
        my ( $Kfirst, $Klast ) = @{$item};
        $self->check_for_old_break( $Kfirst, \%keep_break_before_type,
            $rbreak_before_Kfirst );
        $self->check_for_old_break( $Klast, \%keep_break_after_type,
            $rbreak_after_Klast );
    }
    return;
} ## end sub keep_old_line_breaks

sub weld_containers {

    # Called once per file to do any welding operations requested by --weld*
    # flags.
    my ($self) = @_;

    # This count is used to eliminate needless calls for weld checks elsewhere
    $total_weld_count = 0;

    return if ( $rOpts->{'indent-only'} );
    return unless ($rOpts_add_newlines);

    # Important: sub 'weld_cuddled_blocks' must be called before
    # sub 'weld_nested_containers'. This is because the cuddled option needs to
    # use the original _LEVEL_ values of containers, but the weld nested
    # containers changes _LEVEL_ of welded containers.

    # Here is a good test case to be sure that both cuddling and welding
    # are working and not interfering with each other: <<snippets/ce_wn1.in>>

    #   perltidy -wn -ce

   # if ($BOLD_MATH) { (
   #     $labels, $comment,
   #     join( '', '<B>', &make_math( $mode, '', '', $_ ), '</B>' )
   # ) } else { (
   #     &process_math_in_latex( $mode, $math_style, $slevel, "\\mbox{$text}" ),
   #     $after
   # ) }

    $self->weld_cuddled_blocks() if ( %{$rcuddled_block_types} );

    if ( $rOpts->{'weld-nested-containers'} ) {

        $self->weld_nested_containers();

        $self->weld_nested_quotes();
    }

    #-------------------------------------------------------------
    # All welding is done. Finish setting up weld data structures.
    #-------------------------------------------------------------

    my $rLL                  = $self->[_rLL_];
    my $rK_weld_left         = $self->[_rK_weld_left_];
    my $rK_weld_right        = $self->[_rK_weld_right_];
    my $rweld_len_right_at_K = $self->[_rweld_len_right_at_K_];

    my @K_multi_weld;
    my @keys = keys %{$rK_weld_right};
    $total_weld_count = @keys;

    # First pass to process binary welds.
    # This loop is processed in unsorted order for efficiency.
    foreach my $Kstart (@keys) {
        my $Kend = $rK_weld_right->{$Kstart};

        # An error here would be due to an incorrect initialization introduced
        # in one of the above weld routines, like sub weld_nested.
        if ( $Kend <= $Kstart ) {
            Fault("Bad weld link: Kend=$Kend <= Kstart=$Kstart\n")
              if (DEVEL_MODE);
            next;
        }

        # Set weld values for all tokens this welded pair
        foreach ( $Kstart + 1 .. $Kend ) {
            $rK_weld_left->{$_} = $Kstart;
        }
        foreach my $Kx ( $Kstart .. $Kend - 1 ) {
            $rK_weld_right->{$Kx} = $Kend;
            $rweld_len_right_at_K->{$Kx} =
              $rLL->[$Kend]->[_CUMULATIVE_LENGTH_] -
              $rLL->[$Kx]->[_CUMULATIVE_LENGTH_];
        }

        # Remember the leftmost index of welds which continue to the right
        if ( defined( $rK_weld_right->{$Kend} )
            && !defined( $rK_weld_left->{$Kstart} ) )
        {
            push @K_multi_weld, $Kstart;
        }
    }

    # Second pass to process chains of welds (these are rare).
    # This has to be processed in sorted order.
    if (@K_multi_weld) {
        my $Kend = -1;
        foreach my $Kstart ( sort { $a <=> $b } @K_multi_weld ) {

            # Skip any interior K which was originally missing a left link
            next if ( $Kstart <= $Kend );

            # Find the end of this chain
            $Kend = $rK_weld_right->{$Kstart};
            my $Knext = $rK_weld_right->{$Kend};
            while ( defined($Knext) ) {
                $Kend  = $Knext;
                $Knext = $rK_weld_right->{$Kend};
            }

            # Set weld values this chain
            foreach ( $Kstart + 1 .. $Kend ) {
                $rK_weld_left->{$_} = $Kstart;
            }
            foreach my $Kx ( $Kstart .. $Kend - 1 ) {
                $rK_weld_right->{$Kx} = $Kend;
                $rweld_len_right_at_K->{$Kx} =
                  $rLL->[$Kend]->[_CUMULATIVE_LENGTH_] -
                  $rLL->[$Kx]->[_CUMULATIVE_LENGTH_];
            }
        }
    }

    return;
} ## end sub weld_containers

sub cumulative_length_before_K {
    my ( $self, $KK ) = @_;

    # Returns the cumulative character length from the first token to
    # token before the token at index $KK.
    my $rLL = $self->[_rLL_];
    return ( $KK <= 0 ) ? 0 : $rLL->[ $KK - 1 ]->[_CUMULATIVE_LENGTH_];
}

sub weld_cuddled_blocks {
    my ($self) = @_;

    # Called once per file to handle cuddled formatting

    my $rK_weld_left         = $self->[_rK_weld_left_];
    my $rK_weld_right        = $self->[_rK_weld_right_];
    my $rblock_type_of_seqno = $self->[_rblock_type_of_seqno_];

    # This routine implements the -cb flag by finding the appropriate
    # closing and opening block braces and welding them together.
    return unless ( %{$rcuddled_block_types} );

    my $rLL = $self->[_rLL_];
    return unless ( defined($rLL) && @{$rLL} );

    my $rbreak_container          = $self->[_rbreak_container_];
    my $ris_broken_container      = $self->[_ris_broken_container_];
    my $ris_cuddled_closing_brace = $self->[_ris_cuddled_closing_brace_];
    my $K_closing_container       = $self->[_K_closing_container_];

    # A stack to remember open chains at all levels: This is a hash rather than
    # an array for safety because negative levels can occur in files with
    # errors.  This allows us to keep processing with negative levels.
    # $in_chain{$level} = [$chain_type, $type_sequence];
    my %in_chain;
    my $CBO = $rOpts->{'cuddled-break-option'};

    # loop over structure items to find cuddled pairs
    my $level = 0;
    my $KNEXT = $self->[_K_first_seq_item_];
    while ( defined($KNEXT) ) {
        my $KK = $KNEXT;
        $KNEXT = $rLL->[$KNEXT]->[_KNEXT_SEQ_ITEM_];
        my $rtoken_vars   = $rLL->[$KK];
        my $type_sequence = $rtoken_vars->[_TYPE_SEQUENCE_];
        if ( !$type_sequence ) {
            next if ( $KK == 0 );    # first token in file may not be container

            # A fault here implies that an error was made in the little loop at
            # the bottom of sub 'respace_tokens' which set the values of
            # _KNEXT_SEQ_ITEM_.  Or an error has been introduced in the
            # loop control lines above.
            Fault("sequence = $type_sequence not defined at K=$KK")
              if (DEVEL_MODE);
            next;
        }

        # NOTE: we must use the original levels here. They can get changed
        # by sub 'weld_nested_containers', so this routine must be called
        # before sub 'weld_nested_containers'.
        my $last_level = $level;
        $level = $rtoken_vars->[_LEVEL_];

        if    ( $level < $last_level ) { $in_chain{$last_level} = undef }
        elsif ( $level > $last_level ) { $in_chain{$level}      = undef }
        else {
            ## ok - ($level == $last_level)
        }

        # We are only looking at code blocks
        my $token = $rtoken_vars->[_TOKEN_];
        my $type  = $rtoken_vars->[_TYPE_];
        next unless ( $type eq $token );

        if ( $token eq '{' ) {

            my $block_type = $rblock_type_of_seqno->{$type_sequence};
            if ( !$block_type ) {

                # patch for unrecognized block types which may not be labeled
                my $Kp = $self->K_previous_nonblank($KK);
                while ( $Kp && $rLL->[$Kp]->[_TYPE_] eq '#' ) {
                    $Kp = $self->K_previous_nonblank($Kp);
                }
                next unless $Kp;
                $block_type = $rLL->[$Kp]->[_TOKEN_];
            }
            if ( $in_chain{$level} ) {

                # we are in a chain and are at an opening block brace.
                # See if we are welding this opening brace with the previous
                # block brace.  Get their identification numbers:
                my $closing_seqno = $in_chain{$level}->[1];
                my $opening_seqno = $type_sequence;

                # The preceding block must be on multiple lines so that its
                # closing brace will start a new line.
                if (   !$ris_broken_container->{$closing_seqno}
                    && !$rbreak_container->{$closing_seqno} )
                {
                    next unless ( $CBO == 2 );
                    $rbreak_container->{$closing_seqno} = 1;
                }

                # We can weld the closing brace to its following word ..
                my $Ko = $K_closing_container->{$closing_seqno};
                my $Kon;
                if ( defined($Ko) ) {
                    $Kon = $self->K_next_nonblank($Ko);
                }

                # ..unless it is a comment
                if ( defined($Kon) && $rLL->[$Kon]->[_TYPE_] ne '#' ) {

                    # OK to weld these two tokens...
                    $rK_weld_right->{$Ko} = $Kon;
                    $rK_weld_left->{$Kon} = $Ko;

                    # Set flag that we want to break the next container
                    # so that the cuddled line is balanced.
                    $rbreak_container->{$opening_seqno} = 1
                      if ($CBO);

                    # Remember which braces are cuddled.
                    # The closing brace is used to set adjusted indentations.
                    # The opening brace is not yet used but might eventually
                    # be needed in setting adjusted indentation.
                    $ris_cuddled_closing_brace->{$closing_seqno} = 1;

                }

            }
            else {

                # We are not in a chain. Start a new chain if we see the
                # starting block type.
                if ( $rcuddled_block_types->{$block_type} ) {
                    $in_chain{$level} = [ $block_type, $type_sequence ];
                }
                else {
                    $block_type = '*';
                    $in_chain{$level} = [ $block_type, $type_sequence ];
                }
            }
        }
        elsif ( $token eq '}' ) {
            if ( $in_chain{$level} ) {

                # We are in a chain at a closing brace.  See if this chain
                # continues..
                my $Knn = $self->K_next_code($KK);
                next unless $Knn;

                my $chain_type          = $in_chain{$level}->[0];
                my $next_nonblank_token = $rLL->[$Knn]->[_TOKEN_];
                if (
                    $rcuddled_block_types->{$chain_type}->{$next_nonblank_token}
                  )
                {

                    # Note that we do not weld yet because we must wait until
                    # we we are sure that an opening brace for this follows.
                    $in_chain{$level}->[1] = $type_sequence;
                }
                else { $in_chain{$level} = undef }
            }
        }
        else {
            ## ok - not a curly brace
        }
    }
    return;
} ## end sub weld_cuddled_blocks

sub find_nested_pairs {
    my $self = shift;

    # This routine is called once per file to do preliminary work needed for
    # the --weld-nested option.  This information is also needed for adding
    # semicolons.

    my $rLL = $self->[_rLL_];
    return unless ( defined($rLL) && @{$rLL} );
    my $Num = @{$rLL};

    my $K_opening_container  = $self->[_K_opening_container_];
    my $K_closing_container  = $self->[_K_closing_container_];
    my $rblock_type_of_seqno = $self->[_rblock_type_of_seqno_];

    # We define an array of pairs of nested containers
    my @nested_pairs;

    # Names of calling routines can either be marked as 'i' or 'w',
    # and they may invoke a sub call with an '->'. We will consider
    # any consecutive string of such types as a single unit when making
    # weld decisions.  We also allow a leading !
    my $is_name_type = {
        'i'  => 1,
        'w'  => 1,
        'U'  => 1,
        '->' => 1,
        '!'  => 1,
    };

    # Loop over all closing container tokens
    foreach my $inner_seqno ( keys %{$K_closing_container} ) {
        my $K_inner_closing = $K_closing_container->{$inner_seqno};

        # See if it is immediately followed by another, outer closing token
        my $K_outer_closing = $K_inner_closing + 1;
        $K_outer_closing += 1
          if ( $K_outer_closing < $Num
            && $rLL->[$K_outer_closing]->[_TYPE_] eq 'b' );

        next if ( $K_outer_closing >= $Num );
        my $outer_seqno = $rLL->[$K_outer_closing]->[_TYPE_SEQUENCE_];
        next if ( !$outer_seqno );
        my $token_outer_closing = $rLL->[$K_outer_closing]->[_TOKEN_];
        next if ( !$is_closing_token{$token_outer_closing} );

        # Simple filter: No commas or semicolons in the outer container
        my $rtype_count = $self->[_rtype_count_by_seqno_]->{$outer_seqno};
        if ($rtype_count) {
            next if ( $rtype_count->{','} || $rtype_count->{';'} );
        }

        # Now we have to check the opening tokens.
        my $K_outer_opening = $K_opening_container->{$outer_seqno};
        my $K_inner_opening = $K_opening_container->{$inner_seqno};
        next if ( !defined($K_outer_opening) );
        next if ( !defined($K_inner_opening) );

        my $inner_blocktype = $rblock_type_of_seqno->{$inner_seqno};
        my $outer_blocktype = $rblock_type_of_seqno->{$outer_seqno};

        # Verify that the inner opening token is the next container after the
        # outer opening token.
        my $K_io_check = $rLL->[$K_outer_opening]->[_KNEXT_SEQ_ITEM_];
        next unless defined($K_io_check);
        if ( $K_io_check != $K_inner_opening ) {

            # The inner opening container does not immediately follow the outer
            # opening container, but we may still allow a weld if they are
            # separated by a sub signature.  For example, we may have something
            # like this, where $K_io_check may be at the first 'x' instead of
            # 'io'.  So we need to hop over the signature and see if we arrive
            # at 'io'.

            #            oo               io
            #             |     x       x |
            #   $obj->then( sub ( $code ) {
            #       ...
            #       return $c->render(text => '', status => $code);
            #   } );
            #   | |
            #  ic oc

            next if ( !$inner_blocktype || $inner_blocktype ne 'sub' );
            next if $rLL->[$K_io_check]->[_TOKEN_] ne '(';
            my $seqno_signature = $rLL->[$K_io_check]->[_TYPE_SEQUENCE_];
            next unless defined($seqno_signature);
            my $K_signature_closing = $K_closing_container->{$seqno_signature};
            next unless defined($K_signature_closing);
            my $K_test = $rLL->[$K_signature_closing]->[_KNEXT_SEQ_ITEM_];
            next
              unless ( defined($K_test) && $K_test == $K_inner_opening );

            # OK, we have arrived at 'io' in the above diagram.  We should put
            # a limit on the length or complexity of the signature here.  There
            # is no perfect way to do this, one way is to put a limit on token
            # count.  For consistency with older versions, we should allow a
            # signature with a single variable to weld, but not with
            # multiple variables.  A single variable as in 'sub ($code) {' can
            # have a $Kdiff of 2 to 4, depending on spacing.

            # But two variables like 'sub ($v1,$v2) {' can have a diff of 4 to
            # 7, depending on spacing. So to keep formatting consistent with
            # previous versions, we will also avoid welding if there is a comma
            # in the signature.

            my $Kdiff = $K_signature_closing - $K_io_check;
            next if ( $Kdiff > 4 );

            # backup comma count test; but we cannot get here with Kdiff<=4
            my $rtc = $self->[_rtype_count_by_seqno_]->{$seqno_signature};
            next if ( $rtc && $rtc->{','} );
        }

        # Yes .. this is a possible nesting pair.
        # They can be separated by a small amount.
        my $K_diff = $K_inner_opening - $K_outer_opening;

        # Count the number of nonblank characters separating them.
        # Note: the $nonblank_count includes the inner opening container
        # but not the outer opening container, so it will be >= 1.
        if ( $K_diff < 0 ) { next }    # Shouldn't happen
        my $nonblank_count = 0;
        my $type;
        my $is_name;

        # Here is an example of a long identifier chain which counts as a
        # single nonblank here (this spans about 10 K indexes):
        #     if ( !Boucherot::SetOfConnections->new->handler->execute(
        #        ^--K_o_o                                             ^--K_i_o
        #       @array) )
        my $Kn_first = $K_outer_opening;
        my $Kn_last_nonblank;
        my $saw_comment;

        foreach my $Kn ( $K_outer_opening + 1 .. $K_inner_opening ) {
            next if ( $rLL->[$Kn]->[_TYPE_] eq 'b' );
            if ( !$nonblank_count )        { $Kn_first = $Kn }
            if ( $Kn eq $K_inner_opening ) { $nonblank_count++; last; }
            $Kn_last_nonblank = $Kn;

            # skip chain of identifier tokens
            my $last_type    = $type;
            my $last_is_name = $is_name;
            $type = $rLL->[$Kn]->[_TYPE_];
            if ( $type eq '#' ) { $saw_comment = 1; last }
            $is_name = $is_name_type->{$type};
            next if ( $is_name && $last_is_name );

            # do not count a possible leading - of bareword hash key
            next if ( $type eq 'm' && !$last_type );

            $nonblank_count++;
            last if ( $nonblank_count > 2 );
        }

        # Do not weld across a comment .. fix for c058.
        next if ($saw_comment);

        # Patch for b1104: do not weld to a paren preceded by sort/map/grep
        # because the special line break rules may cause a blinking state
        if (   defined($Kn_last_nonblank)
            && $rLL->[$K_inner_opening]->[_TOKEN_] eq '('
            && $rLL->[$Kn_last_nonblank]->[_TYPE_] eq 'k' )
        {
            my $token = $rLL->[$Kn_last_nonblank]->[_TOKEN_];

            # Turn off welding at sort/map/grep (
            if ( $is_sort_map_grep{$token} ) { $nonblank_count = 10 }
        }

        my $token_oo = $rLL->[$K_outer_opening]->[_TOKEN_];

        if (

            # 1: adjacent opening containers, like: do {{
            $nonblank_count == 1

            # 2. anonymous sub + prototype or sig:  )->then( sub ($code) {
            # ... but it seems best not to stack two structural blocks, like
            # this
            #    sub make_anon_with_my_sub { sub {
            # because it probably hides the structure a little too much.
            || (   $inner_blocktype
                && $inner_blocktype eq 'sub'
                && $rLL->[$Kn_first]->[_TOKEN_] eq 'sub'
                && !$outer_blocktype )

            # 3. short item following opening paren, like:  fun( yyy (
            || $nonblank_count == 2 && $token_oo eq '('

            # 4. weld around fat commas, if requested (git #108), such as
            #     elf->call_method( method_name_foo => {
            || (   $type eq '=>'
                && $nonblank_count <= 3
                && %weld_fat_comma_rules
                && $weld_fat_comma_rules{$token_oo} )
          )
        {
            push @nested_pairs,
              [ $inner_seqno, $outer_seqno, $K_inner_closing ];
        }
        next;
    }

    # The weld routine expects the pairs in order in the form
    #   [$seqno_inner, $seqno_outer]
    # And they must be in the same order as the inner closing tokens
    # (otherwise, welds of three or more adjacent tokens will not work).  The K
    # value of this inner closing token has temporarily been stored for
    # sorting.
    @nested_pairs =

      # Drop the K index after sorting (it would cause trouble downstream)
      map { [ $_->[0], $_->[1] ] }

      # Sort on the K values
      sort { $a->[2] <=> $b->[2] } @nested_pairs;

    return \@nested_pairs;
} ## end sub find_nested_pairs

sub match_paren_control_flag {

    # Decide if this paren is excluded by user request:
    #   undef matches no parens
    #   '*' matches all parens
    #   'k' matches only if the previous nonblank token is a perl builtin
    #       keyword (such as 'if', 'while'),
    #   'K' matches if 'k' does not, meaning if the previous token is not a
    #       keyword.
    #   'f' matches if the previous token is a function other than a keyword.
    #   'F' matches if 'f' does not.
    #   'w' matches if either 'k' or 'f' match.
    #   'W' matches if 'w' does not.
    my ( $self, $seqno, $flag, $rLL ) = @_;

    # Input parameters:
    # $seqno = sequence number of the container (should be paren)
    # $flag  = the flag which defines what matches
    # $rLL   = an optional alternate token list needed for respace operations
    $rLL = $self->[_rLL_] unless ( defined($rLL) );

    return 0 unless ( defined($flag) );
    return 0 if $flag eq '0';
    return 1 if $flag eq '1';
    return 1 if $flag eq '*';
    return 0 unless ($seqno);
    my $K_opening = $self->[_K_opening_container_]->{$seqno};
    return unless ( defined($K_opening) );

    my ( $is_f, $is_k, $is_w );
    my $Kp = $self->K_previous_nonblank( $K_opening, $rLL );
    if ( defined($Kp) ) {
        my $type_p = $rLL->[$Kp]->[_TYPE_];

        # keyword?
        $is_k = $type_p eq 'k';

        # function call?
        $is_f = $self->[_ris_function_call_paren_]->{$seqno};

        # either keyword or function call?
        $is_w = $is_k || $is_f;
    }
    my $match;
    if    ( $flag eq 'k' ) { $match = $is_k }
    elsif ( $flag eq 'K' ) { $match = !$is_k }
    elsif ( $flag eq 'f' ) { $match = $is_f }
    elsif ( $flag eq 'F' ) { $match = !$is_f }
    elsif ( $flag eq 'w' ) { $match = $is_w }
    elsif ( $flag eq 'W' ) { $match = !$is_w }
    else {
        ## no match
    }
    return $match;
} ## end sub match_paren_control_flag

sub is_excluded_weld {

    # decide if this weld is excluded by user request
    my ( $self, $KK, $is_leading ) = @_;
    my $rLL         = $self->[_rLL_];
    my $rtoken_vars = $rLL->[$KK];
    my $token       = $rtoken_vars->[_TOKEN_];
    my $rflags      = $weld_nested_exclusion_rules{$token};
    return 0 unless ( defined($rflags) );
    my $flag = $is_leading ? $rflags->[0] : $rflags->[1];
    return 0 unless ( defined($flag) );
    return 1 if $flag eq '*';
    my $seqno = $rtoken_vars->[_TYPE_SEQUENCE_];
    return $self->match_paren_control_flag( $seqno, $flag );
} ## end sub is_excluded_weld

# hashes to simplify welding logic
my %type_ok_after_bareword;
my %has_tight_paren;

BEGIN {

    # types needed for welding RULE 6
    my @q = qw# => -> { ( [ #;
    @type_ok_after_bareword{@q} = (1) x scalar(@q);

    # these types do not 'like' to be separated from a following paren
    @q = qw(w i q Q G C Z U);
    @{has_tight_paren}{@q} = (1) x scalar(@q);
} ## end BEGIN

use constant DEBUG_WELD => 0;

sub setup_new_weld_measurements {

    # Define quantities to check for excess line lengths when welded.
    # Called by sub 'weld_nested_containers' and sub 'weld_nested_quotes'

    my ( $self, $Kouter_opening, $Kinner_opening ) = @_;

    # Given indexes of outer and inner opening containers to be welded:
    #   $Kouter_opening, $Kinner_opening

    # Returns these variables:
    #   $new_weld_ok = true (new weld ok) or false (do not start new weld)
    #   $starting_indent = starting indentation
    #   $starting_lentot = starting cumulative length
    #   $msg = diagnostic message for debugging

    my $rLL    = $self->[_rLL_];
    my $rlines = $self->[_rlines_];

    my $starting_level;
    my $starting_ci;
    my $starting_lentot;
    my $maximum_text_length;
    my $msg = EMPTY_STRING;

    my $iline_oo = $rLL->[$Kouter_opening]->[_LINE_INDEX_];
    my $rK_range = $rlines->[$iline_oo]->{_rK_range};
    my ( $Kfirst, $Klast ) = @{$rK_range};

    #-------------------------------------------------------------------------
    # We now define a reference index, '$Kref', from which to start measuring
    # This choice turns out to be critical for keeping welds stable during
    # iterations, so we go through a number of STEPS...
    #-------------------------------------------------------------------------

    # STEP 1: Our starting guess is to use measure from the first token of the
    # current line.  This is usually a good guess.
    my $Kref = $Kfirst;

    # STEP 2: See if we should go back a little farther
    my $Kprev = $self->K_previous_nonblank($Kfirst);
    if ( defined($Kprev) ) {

        # Avoid measuring from between an opening paren and a previous token
        # which should stay close to it ... fixes b1185
        my $token_oo  = $rLL->[$Kouter_opening]->[_TOKEN_];
        my $type_prev = $rLL->[$Kprev]->[_TYPE_];
        if (   $Kouter_opening == $Kfirst
            && $token_oo eq '('
            && $has_tight_paren{$type_prev} )
        {
            $Kref = $Kprev;
        }

        # Back up and count length from a token like '=' or '=>' if -lp
        # is used (this fixes b520)
        # ...or if a break is wanted before there
        elsif ($rOpts_line_up_parentheses
            || $want_break_before{$type_prev} )
        {

            # If there are other sequence items between the start of this line
            # and the opening token in question, then do not include tokens on
            # the previous line in length calculations.  This check added to
            # fix case b1174 which had a '?' on the line
            my $no_previous_seq_item = $Kref == $Kouter_opening
              || $rLL->[$Kref]->[_KNEXT_SEQ_ITEM_] == $Kouter_opening;

            if ( $no_previous_seq_item
                && substr( $type_prev, 0, 1 ) eq '=' )
            {
                $Kref = $Kprev;

                # Fix for b1144 and b1112: backup to the first nonblank
                # character before the =>, or to the start of its line.
                if ( $type_prev eq '=>' ) {
                    my $iline_prev    = $rLL->[$Kprev]->[_LINE_INDEX_];
                    my $rK_range_prev = $rlines->[$iline_prev]->{_rK_range};
                    my ( $Kfirst_prev, $Klast_prev ) = @{$rK_range_prev};
                    foreach my $KK ( reverse( $Kfirst_prev .. $Kref - 1 ) ) {
                        next if ( $rLL->[$KK]->[_TYPE_] eq 'b' );
                        $Kref = $KK;
                        last;
                    }
                }
            }
        }
        else {
            ## ok
        }
    }

    # STEP 3: Now look ahead for a ternary and, if found, use it.
    # This fixes case b1182.
    # Also look for a ')' at the same level and, if found, use it.
    # This fixes case b1224.
    if ( $Kref < $Kouter_opening ) {
        my $Knext    = $rLL->[$Kref]->[_KNEXT_SEQ_ITEM_];
        my $level_oo = $rLL->[$Kouter_opening]->[_LEVEL_];
        while ( $Knext < $Kouter_opening ) {
            if ( $rLL->[$Knext]->[_LEVEL_] == $level_oo ) {
                if (   $is_ternary{ $rLL->[$Knext]->[_TYPE_] }
                    || $rLL->[$Knext]->[_TOKEN_] eq ')' )
                {
                    $Kref = $Knext;
                    last;
                }
            }
            $Knext = $rLL->[$Knext]->[_KNEXT_SEQ_ITEM_];
        }
    }

    # Define the starting measurements we will need
    $starting_lentot =
      $Kref <= 0 ? 0 : $rLL->[ $Kref - 1 ]->[_CUMULATIVE_LENGTH_];
    $starting_level = $rLL->[$Kref]->[_LEVEL_];
    $starting_ci    = $rLL->[$Kref]->[_CI_LEVEL_];

    $maximum_text_length = $maximum_text_length_at_level[$starting_level] -
      $starting_ci * $rOpts_continuation_indentation;

    # STEP 4: Switch to using the outer opening token as the reference
    # point if a line break before it would make a longer line.
    # Fixes case b1055 and is also an alternate fix for b1065.
    my $starting_level_oo = $rLL->[$Kouter_opening]->[_LEVEL_];
    if ( $Kref < $Kouter_opening ) {
        my $starting_ci_oo = $rLL->[$Kouter_opening]->[_CI_LEVEL_];
        my $lentot_oo = $rLL->[ $Kouter_opening - 1 ]->[_CUMULATIVE_LENGTH_];
        my $maximum_text_length_oo =
          $maximum_text_length_at_level[$starting_level_oo] -
          $starting_ci_oo * $rOpts_continuation_indentation;

        # The excess length to any cumulative length K = lenK is either
        #     $excess = $lenk - ($lentot    + $maximum_text_length),     or
        #     $excess = $lenk - ($lentot_oo + $maximum_text_length_oo),
        # so the worst case (maximum excess) corresponds to the configuration
        # with minimum value of the sum: $lentot + $maximum_text_length
        if ( $lentot_oo + $maximum_text_length_oo <
            $starting_lentot + $maximum_text_length )
        {
            $Kref                = $Kouter_opening;
            $starting_level      = $starting_level_oo;
            $starting_ci         = $starting_ci_oo;
            $starting_lentot     = $lentot_oo;
            $maximum_text_length = $maximum_text_length_oo;
        }
    }

    my $new_weld_ok = 1;

    # STEP 5, fix b1020: Avoid problem areas with the -wn -lp combination.  The
    # combination -wn -lp -dws -naws does not work well and can cause blinkers.
    # It will probably only occur in stress testing.  For this situation we
    # will only start a new weld if we start at a 'good' location.
    # - Added 'if' to fix case b1032.
    # - Require blank before certain previous characters to fix b1111.
    # - Add ';' to fix case b1139
    # - Convert from '$ok_to_weld' to '$new_weld_ok' to fix b1162.
    # - relaxed constraints for b1227
    # - added skip if type is 'q' for b1349 and b1350 b1351 b1352 b1353
    # - added skip if type is 'Q' for b1447
    if (   $starting_ci
        && $rOpts_line_up_parentheses
        && $rOpts_delete_old_whitespace
        && !$rOpts_add_whitespace
        && $rLL->[$Kinner_opening]->[_TYPE_] ne 'q'
        && $rLL->[$Kinner_opening]->[_TYPE_] ne 'Q'
        && defined($Kprev) )
    {
        my $type_first  = $rLL->[$Kfirst]->[_TYPE_];
        my $token_first = $rLL->[$Kfirst]->[_TOKEN_];
        my $type_prev   = $rLL->[$Kprev]->[_TYPE_];
        my $type_pp     = 'b';
        if ( $Kprev >= 0 ) { $type_pp = $rLL->[ $Kprev - 1 ]->[_TYPE_] }

        my $is_good_location =

          $type_prev =~ /^[\,\.\;]/
          || ( $type_prev =~ /^[=\{\[\(\L]/
            && ( $type_pp eq 'b' || $type_pp eq '}' || $type_first eq 'k' ) )
          || $type_first =~ /^[=\,\.\;\{\[\(\L]/
          || $type_first eq '||'
          || (
            $type_first eq 'k'
            && (   $token_first eq 'if'
                || $token_first eq 'or' )
          );

        if ( !$is_good_location ) {
            $msg =
"Skipping weld: poor break with -lp and ci at type_first='$type_first' type_prev='$type_prev' type_pp=$type_pp\n";
            $new_weld_ok = 0;
        }
    }
    return ( $new_weld_ok, $maximum_text_length, $starting_lentot, $msg );
} ## end sub setup_new_weld_measurements

sub excess_line_length_for_Krange {
    my ( $self, $Kfirst, $Klast ) = @_;

    # returns $excess_length =
    #   by how many characters a line composed of tokens $Kfirst .. $Klast will
    #   exceed the allowed line length

    my $rLL = $self->[_rLL_];
    my $length_before_Kfirst =
      $Kfirst <= 0
      ? 0
      : $rLL->[ $Kfirst - 1 ]->[_CUMULATIVE_LENGTH_];

    # backup before a side comment if necessary
    my $Kend = $Klast;
    if (   $rOpts_ignore_side_comment_lengths
        && $rLL->[$Klast]->[_TYPE_] eq '#' )
    {
        my $Kprev = $self->K_previous_nonblank($Klast);
        if ( defined($Kprev) && $Kprev >= $Kfirst ) { $Kend = $Kprev }
    }

    # get the length of the text
    my $length = $rLL->[$Kend]->[_CUMULATIVE_LENGTH_] - $length_before_Kfirst;

    # get the size of the text window
    my $level           = $rLL->[$Kfirst]->[_LEVEL_];
    my $ci_level        = $rLL->[$Kfirst]->[_CI_LEVEL_];
    my $max_text_length = $maximum_text_length_at_level[$level] -
      $ci_level * $rOpts_continuation_indentation;

    my $excess_length = $length - $max_text_length;

    DEBUG_WELD
      && print
"Kfirst=$Kfirst, Klast=$Klast, Kend=$Kend, level=$level, ci=$ci_level, max_text_length=$max_text_length, length=$length\n";
    return ($excess_length);
} ## end sub excess_line_length_for_Krange

sub weld_nested_containers {
    my ($self) = @_;

    # Called once per file for option '--weld-nested-containers'

    my $rK_weld_left  = $self->[_rK_weld_left_];
    my $rK_weld_right = $self->[_rK_weld_right_];

    # This routine implements the -wn flag by "welding together"
    # the nested closing and opening tokens which were previously
    # identified by sub 'find_nested_pairs'.  "welding" simply
    # involves setting certain hash values which will be checked
    # later during formatting.

    my $rLL                     = $self->[_rLL_];
    my $rlines                  = $self->[_rlines_];
    my $K_opening_container     = $self->[_K_opening_container_];
    my $K_closing_container     = $self->[_K_closing_container_];
    my $rblock_type_of_seqno    = $self->[_rblock_type_of_seqno_];
    my $ris_asub_block          = $self->[_ris_asub_block_];
    my $rmax_vertical_tightness = $self->[_rmax_vertical_tightness_];

    my $rOpts_asbl = $rOpts->{'opening-anonymous-sub-brace-on-new-line'};

    # Find nested pairs of container tokens for any welding.
    my $rnested_pairs = $self->find_nested_pairs();

    # Return unless there are nested pairs to weld
    return unless defined($rnested_pairs) && @{$rnested_pairs};

    # NOTE: It would be nice to apply RULE 5 right here by deleting unwanted
    # pairs.  But it isn't clear if this is possible because we don't know
    # which sequences might actually start a weld.

    my $rOpts_break_at_old_method_breakpoints =
      $rOpts->{'break-at-old-method-breakpoints'};

    # This array will hold the sequence numbers of the tokens to be welded.
    my @welds;

    # Variables needed for estimating line lengths
    my $maximum_text_length;    # maximum spaces available for text
    my $starting_lentot;        # cumulative text to start of current line

    my $iline_outer_opening   = -1;
    my $weld_count_this_start = 0;
    my $weld_starts_in_block  = 0;

    # OLD: $single_line_tol added to fix cases b1180 b1181
    #       = $rOpts_continuation_indentation > $rOpts_indent_columns ? 1 : 0;
    # NEW: $single_line_tol=0  fixes b1212; and b1180-1181 work ok now
    #                      =1  for -vmll and -lp; fixes b1452, b1453, b1454
    # NOTE: the combination -vmll and -lp can be unstable, especially when
    # also combined with -wn. It may eventually be necessary to turn off -vmll
    # if -lp is set. For now, this works. The value '1' is a minimum which
    # works but can be increased if necessary.
    my $single_line_tol =
      $rOpts_variable_maximum_line_length && $rOpts_line_up_parentheses
      ? 1
      : 0;

    my $multiline_tol = $single_line_tol + 1 +
      max( $rOpts_indent_columns, $rOpts_continuation_indentation );

    # Define a welding cutoff level: do not start a weld if the inside
    # container level equals or exceeds this level.

    # We use the minimum of two criteria, either of which may be more
    # restrictive.  The 'alpha' value is more restrictive in (b1206, b1252) and
    # the 'beta' value is more restrictive in other cases (b1243).
    # Reduced beta term from beta+3 to beta+2 to fix b1401. Previously:
    # my $weld_cutoff_level = min($stress_level_alpha, $stress_level_beta + 2);
    # This is now '$high_stress_level'.

    # The vertical tightness flags can throw off line length calculations.
    # This patch was added to fix instability issue b1284.
    # It works to always use a tol of 1 for 1 line block length tests, but
    # this restricted value keeps test case wn6.wn working as before.
    # It may be necessary to include '[' and '{' here in the future.
    my $one_line_tol = $opening_vertical_tightness{'('} ? 1 : 0;

    # Abbreviations:
    #  _oo=outer opening, i.e. first of  { {
    #  _io=inner opening, i.e. second of { {
    #  _oc=outer closing, i.e. second of } {
    #  _ic=inner closing, i.e. first of  } }

    my $previous_pair;

    # Main loop over nested pairs...
    # We are working from outermost to innermost pairs so that
    # level changes will be complete when we arrive at the inner pairs.
    while ( my $item = pop( @{$rnested_pairs} ) ) {
        my ( $inner_seqno, $outer_seqno ) = @{$item};

        my $Kouter_opening = $K_opening_container->{$outer_seqno};
        my $Kinner_opening = $K_opening_container->{$inner_seqno};
        my $Kouter_closing = $K_closing_container->{$outer_seqno};
        my $Kinner_closing = $K_closing_container->{$inner_seqno};

        # RULE: do not weld if inner container has <= 3 tokens unless the next
        # token is a heredoc (so we know there will be multiple lines)
        if ( $Kinner_closing - $Kinner_opening <= 4 ) {
            my $Knext_nonblank = $self->K_next_nonblank($Kinner_opening);
            next unless defined($Knext_nonblank);
            my $type = $rLL->[$Knext_nonblank]->[_TYPE_];
            next unless ( $type eq 'h' );
        }

        my $outer_opening = $rLL->[$Kouter_opening];
        my $inner_opening = $rLL->[$Kinner_opening];
        my $outer_closing = $rLL->[$Kouter_closing];
        my $inner_closing = $rLL->[$Kinner_closing];

        # RULE: do not weld to a hash brace.  The reason is that it has a very
        # strong bond strength to the next token, so a line break after it
        # may not work.  Previously we allowed welding to something like @{
        # but that caused blinking states (cases b751, b779).
        if ( $inner_opening->[_TYPE_] eq 'L' ) {
            next;
        }

        # RULE: do not weld to a square bracket which does not contain commas
        if ( $inner_opening->[_TYPE_] eq '[' ) {
            my $rtype_count = $self->[_rtype_count_by_seqno_]->{$inner_seqno};
            next unless ( $rtype_count && $rtype_count->{','} );

            # Do not weld if there is text before a '[' such as here:
            #      curr_opt ( @beg [2,5] )
            # It will not break into the desired sandwich structure.
            # This fixes case b109, 110.
            my $Kdiff = $Kinner_opening - $Kouter_opening;
            next if ( $Kdiff > 2 );
            next
              if ( $Kdiff == 2
                && $rLL->[ $Kouter_opening + 1 ]->[_TYPE_] ne 'b' );

        }

        # RULE: Avoid welding under stress.  The idea is that we need to have a
        # little space* within a welded container to avoid instability.  Note
        # that after each weld the level values are reduced, so long multiple
        # welds can still be made.  This rule will seldom be a limiting factor
        # in actual working code. Fixes b1206, b1243.
        my $inner_level = $inner_opening->[_LEVEL_];
        if ( $inner_level >= $high_stress_level ) { next }

        # Set flag saying if this pair starts a new weld
        my $starting_new_weld = !( @welds && $outer_seqno == $welds[-1]->[0] );

        # Set flag saying if this pair is adjacent to the previous nesting pair
        # (even if previous pair was rejected as a weld)
        my $touch_previous_pair =
          defined($previous_pair) && $outer_seqno == $previous_pair->[0];
        $previous_pair = $item;

        my $do_not_weld_rule = 0;
        my $Msg              = EMPTY_STRING;
        my $is_one_line_weld;

        my $iline_oo = $outer_opening->[_LINE_INDEX_];
        my $iline_io = $inner_opening->[_LINE_INDEX_];
        my $iline_ic = $inner_closing->[_LINE_INDEX_];
        my $iline_oc = $outer_closing->[_LINE_INDEX_];
        my $token_oo = $outer_opening->[_TOKEN_];
        my $token_io = $inner_opening->[_TOKEN_];

        # DO-NOT-WELD RULE 7: Do not weld if this conflicts with -bom
        # Added for case b973. Moved here from below to fix b1423.
        if (  !$do_not_weld_rule
            && $rOpts_break_at_old_method_breakpoints
            && $iline_io > $iline_oo )
        {

            foreach my $iline ( $iline_oo + 1 .. $iline_io ) {
                my $rK_range = $rlines->[$iline]->{_rK_range};
                next unless defined($rK_range);
                my ( $Kfirst, $Klast ) = @{$rK_range};
                next unless defined($Kfirst);
                if ( $rLL->[$Kfirst]->[_TYPE_] eq '->' ) {
                    $do_not_weld_rule = 7;
                    last;
                }
            }
        }
        next if ($do_not_weld_rule);

        # Turn off vertical tightness at possible one-line welds.  Fixes b1402,
        # b1419, b1421, b1424, b1425. This also fixes issues b1338, b1339,
        # b1340, b1341, b1342, b1343, which previously used a separate fix.
        # Issue c161 is the latest and simplest check, using
        # $iline_ic==$iline_io as the test.
        if (   %opening_vertical_tightness
            && $iline_ic == $iline_io
            && $opening_vertical_tightness{$token_oo} )
        {
            $rmax_vertical_tightness->{$outer_seqno} = 0;
        }

        my $is_multiline_weld =
             $iline_oo == $iline_io
          && $iline_ic == $iline_oc
          && $iline_io != $iline_ic;

        if (DEBUG_WELD) {
            my $len_oo = $rLL->[$Kouter_opening]->[_CUMULATIVE_LENGTH_];
            my $len_io = $rLL->[$Kinner_opening]->[_CUMULATIVE_LENGTH_];
            $Msg .= <<EOM;
Pair seqo=$outer_seqno seqi=$inner_seqno  lines: loo=$iline_oo lio=$iline_io lic=$iline_ic loc=$iline_oc
Koo=$Kouter_opening Kio=$Kinner_opening Kic=$Kinner_closing Koc=$Kouter_closing lenoo=$len_oo lenio=$len_io
tokens '$token_oo' .. '$token_io'
EOM
        }

        # DO-NOT-WELD RULE 0:
        # Avoid a new paren-paren weld if inner parens are 'sheared' (separated
        # by one line).  This can produce instabilities (fixes b1250 b1251
        # 1256).
        if (  !$is_multiline_weld
            && $iline_ic == $iline_io + 1
            && $token_oo eq '('
            && $token_io eq '(' )
        {
            if (DEBUG_WELD) {
                $Msg .= "RULE 0: Not welding due to sheared inner parens\n";
                print {*STDOUT} $Msg;
            }
            next;
        }

        # If this pair is not adjacent to the previous pair (skipped or not),
        # then measure lengths from the start of line of oo.
        if (
            !$touch_previous_pair

            # Also do this if restarting at a new line; fixes case b965, s001
            || ( !$weld_count_this_start && $iline_oo > $iline_outer_opening )
          )
        {

            # Remember the line we are using as a reference
            $iline_outer_opening   = $iline_oo;
            $weld_count_this_start = 0;
            $weld_starts_in_block  = 0;

            ( my $new_weld_ok, $maximum_text_length, $starting_lentot, my $msg )
              = $self->setup_new_weld_measurements( $Kouter_opening,
                $Kinner_opening );

            if (
                !$new_weld_ok
                && (   $iline_oo != $iline_io
                    || $iline_ic != $iline_oc )
              )
            {
                if (DEBUG_WELD) { print {*STDOUT} $msg }
                next;
            }

            my $rK_range = $rlines->[$iline_oo]->{_rK_range};
            my ( $Kfirst, $Klast ) = @{$rK_range};

            # An existing one-line weld is a line in which
            # (1) the containers are all on one line, and
            # (2) the line does not exceed the allowable length
            if ( $iline_oo == $iline_oc ) {

                # All the tokens are on one line, now check their length.
                # Start with the full line index range. We will reduce this
                # in the coding below in some cases.
                my $Kstart = $Kfirst;
                my $Kstop  = $Klast;

                # Note that the following minimal choice for measuring will
                # work and will not cause any instabilities because it is
                # invariant:

                ##  my $Kstart = $Kouter_opening;
                ##  my $Kstop  = $Kouter_closing;

                # But that can lead to some undesirable welds.  So a little
                # more complicated method has been developed.

                # We are trying to avoid creating bad two-line welds when we are
                # working on long, previously un-welded input text, such as

                # INPUT (example of a long input line weld candidate):
                ## $mutation->transpos( $self->RNA->position($mutation->label, $atg_label));

                #  GOOD two-line break: (not welded; result marked too long):
                ## $mutation->transpos(
                ##                 $self->RNA->position($mutation->label, $atg_label));

                #  BAD two-line break: (welded; result if we weld):
                ## $mutation->transpos($self->RNA->position(
                ##                                      $mutation->label, $atg_label));

                # We can only get an approximate estimate of the final length,
                # since the line breaks may change, and for -lp mode because
                # even the indentation is not yet known.

                my $level_first = $rLL->[$Kfirst]->[_LEVEL_];
                my $level_last  = $rLL->[$Klast]->[_LEVEL_];
                my $level_oo    = $rLL->[$Kouter_opening]->[_LEVEL_];
                my $level_oc    = $rLL->[$Kouter_closing]->[_LEVEL_];

                # - measure to the end of the original line if balanced
                # - measure to the closing container if unbalanced (fixes b1230)
                #if ( $level_first != $level_last ) { $Kstop = $Kouter_closing }
                if ( $level_oc > $level_last ) { $Kstop = $Kouter_closing }

                # - measure from the start of the original line if balanced
                # - measure from the most previous token with same level
                #   if unbalanced (b1232)
                if ( $Kouter_opening > $Kfirst && $level_oo > $level_first ) {
                    $Kstart = $Kouter_opening;

                    foreach
                      my $KK ( reverse( $Kfirst + 1 .. $Kouter_opening - 1 ) )
                    {
                        next if ( $rLL->[$KK]->[_TYPE_] eq 'b' );
                        last if ( $rLL->[$KK]->[_LEVEL_] < $level_oo );
                        $Kstart = $KK;
                    }
                }

                my $excess =
                  $self->excess_line_length_for_Krange( $Kstart, $Kstop );

                # Coding simplified here for case b1219.
                # Increased tol from 0 to 1 when pvt>0 to fix b1284.
                $is_one_line_weld = $excess <= $one_line_tol;
            }

            # DO-NOT-WELD RULE 1:
            # Do not weld something that looks like the start of a two-line
            # function call, like this: <<snippets/wn6.in>>
            #    $trans->add_transformation(
            #        PDL::Graphics::TriD::Scale->new( $sx, $sy, $sz ) );
            # We will look for a semicolon after the closing paren.

            # We want to weld something complex, like this though
            # my $compass = uc( opposite_direction( line_to_canvas_direction(
            #     @{ $coords[0] }, @{ $coords[1] } ) ) );
            # Otherwise we will get a 'blinker'. For example, the following
            # would become a blinker without this rule:
            #        $Self->_Add( $SortOrderDisplay{ $Field
            #              ->GenerateFieldForSelectSQL() } );
            # But it is okay to weld a two-line statement if it looks like
            # it was already welded, meaning that the two opening containers are
            # on a different line that the two closing containers.  This is
            # necessary to prevent blinking of something like this with
            # perltidy -wn -pbp (starting indentation two levels deep):

            # $top_label->set_text( gettext(
            #    "Unable to create personal directory - check permissions.") );
            if (   $iline_oc == $iline_oo + 1
                && $iline_io == $iline_ic
                && $token_oo eq '(' )
            {

                # Look for following semicolon...
                my $Knext_nonblank = $self->K_next_nonblank($Kouter_closing);
                my $next_nonblank_type =
                  defined($Knext_nonblank)
                  ? $rLL->[$Knext_nonblank]->[_TYPE_]
                  : 'b';
                if ( $next_nonblank_type eq ';' ) {

                    # Then do not weld if no other containers between inner
                    # opening and closing.
                    my $Knext_seq_item = $inner_opening->[_KNEXT_SEQ_ITEM_];
                    if ( $Knext_seq_item == $Kinner_closing ) {
                        $do_not_weld_rule = 1;
                    }
                }
            }
        } ## end starting new weld sequence

        else {

            # set the 1-line flag if continuing a weld sequence; fixes b1239
            $is_one_line_weld = ( $iline_oo == $iline_oc );
        }

        # DO-NOT-WELD RULE 2:
        # Do not weld an opening paren to an inner one line brace block
        # We will just use old line numbers for this test and require
        # iterations if necessary for convergence

        # For example, otherwise we could cause the opening paren
        # in the following example to separate from the caller name
        # as here:

        #    $_[0]->code_handler
        #      ( sub { $more .= $_[1] . ":" . $_[0] . "\n" } );

        # Here is another example where we do not want to weld:
        #  $wrapped->add_around_modifier(
        #    sub { push @tracelog => 'around 1'; $_[0]->(); } );

        # If the one line sub block gets broken due to length or by the
        # user, then we can weld.  The result will then be:
        # $wrapped->add_around_modifier( sub {
        #    push @tracelog => 'around 1';
        #    $_[0]->();
        # } );

        # Updated to fix cases b1082 b1102 b1106 b1115:
        # Also, do not weld to an intact inner block if the outer opening token
        # is on a different line. For example, this prevents oscillation
        # between these two states in case b1106:

        #    return map{
        #        ($_,[$self->$_(@_[1..$#_])])
        #    }@every;

        #    return map { (
        #        $_, [ $self->$_( @_[ 1 .. $#_ ] ) ]
        #    ) } @every;

        # The effect of this change on typical code is very minimal.  Sometimes
        # it may take a second iteration to converge, but this gives protection
        # against blinking.
        if (   !$do_not_weld_rule
            && !$is_one_line_weld
            && $iline_ic == $iline_io )
        {
            $do_not_weld_rule = 2
              if ( $token_oo eq '(' || $iline_oo != $iline_io );
        }

        # DO-NOT-WELD RULE 2A:
        # Do not weld an opening asub brace in -lp mode if -asbl is set. This
        # helps avoid instabilities in one-line block formation, and fixes
        # b1241.  Previously, the '$is_one_line_weld' flag was tested here
        # instead of -asbl, and this fixed most cases. But it turns out that
        # the real problem was the -asbl flag, and switching to this was
        # necessary to fixe b1268.  This also fixes b1269, b1277, b1278.
        if (  !$do_not_weld_rule
            && $rOpts_line_up_parentheses
            && $rOpts_asbl
            && $ris_asub_block->{$outer_seqno} )
        {
            $do_not_weld_rule = '2A';
        }

        # DO-NOT-WELD RULE 3:
        # Do not weld if this makes our line too long.
        # Use a tolerance which depends on if the old tokens were welded
        # (fixes cases b746 b748 b749 b750 b752 b753 b754 b755 b756 b758 b759)
        if ( !$do_not_weld_rule ) {

            # Measure to a little beyond the inner opening token if it is
            # followed by a bare word, which may have unusual line break rules.

            # NOTE: Originally this was OLD RULE 6: do not weld to a container
            # which is followed on the same line by an unknown bareword token.
            # This can cause blinkers (cases b626, b611).  But OK to weld one
            # line welds to fix cases b1057 b1064.  For generality, OLD RULE 6
            # has been merged into RULE 3 here to also fix cases b1078 b1091.

            my $K_for_length = $Kinner_opening;
            my $Knext_io     = $self->K_next_nonblank($Kinner_opening);
            next unless ( defined($Knext_io) );    # shouldn't happen
            my $type_io_next = $rLL->[$Knext_io]->[_TYPE_];

            # Note: may need to eventually also include other types here,
            # such as 'Z' and 'Y':   if ($type_io_next =~ /^[ZYw]$/) {
            if ( $type_io_next eq 'w' ) {
                my $Knext_io2 = $self->K_next_nonblank($Knext_io);
                next unless ( defined($Knext_io2) );
                my $type_io_next2 = $rLL->[$Knext_io2]->[_TYPE_];
                if ( !$type_ok_after_bareword{$type_io_next2} ) {
                    $K_for_length = $Knext_io2;
                }
            }

            # Use a tolerance for welds over multiple lines to avoid blinkers.
            # We can use zero tolerance if it looks like we are working on an
            # existing weld.
            my $tol =
                $is_one_line_weld || $is_multiline_weld
              ? $single_line_tol
              : $multiline_tol;

            # By how many characters does this exceed the text window?
            my $excess =
              $self->cumulative_length_before_K($K_for_length) -
              $starting_lentot + 1 + $tol -
              $maximum_text_length;

            # Old patch: Use '>=0' instead of '> 0' here to fix cases b995 b998
            # b1000 b1001 b1007 b1008 b1009 b1010 b1011 b1012 b1016 b1017 b1018
            # Revised patch: New tolerance definition allows going back to '> 0'
            # here.  This fixes case b1124.  See also cases b1087 and b1087a.
            if ( $excess > 0 ) { $do_not_weld_rule = 3 }

            if (DEBUG_WELD) {
                $Msg .=
"RULE 3 test: excess length to K=$Kinner_opening is $excess > 0 with tol= $tol ?) \n";
            }
        }

        # DO-NOT-WELD RULE 4; implemented for git#10:
        # Do not weld an opening -ce brace if the next container is on a single
        # line, different from the opening brace. (This is very rare).  For
        # example, given the following with -ce, we will avoid joining the {
        # and [

        #  } else {
        #      [ $_, length($_) ]
        #  }

        # because this would produce a terminal one-line block:

        #  } else { [ $_, length($_) ]  }

        # which may not be what is desired. But given this input:

        #  } else { [ $_, length($_) ]  }

        # then we will do the weld and retain the one-line block
        if ( !$do_not_weld_rule && $rOpts->{'cuddled-else'} ) {
            my $block_type = $rblock_type_of_seqno->{$outer_seqno};
            if ( $block_type && $rcuddled_block_types->{'*'}->{$block_type} ) {
                my $io_line = $inner_opening->[_LINE_INDEX_];
                my $ic_line = $inner_closing->[_LINE_INDEX_];
                my $oo_line = $outer_opening->[_LINE_INDEX_];
                if ( $oo_line < $io_line && $ic_line == $io_line ) {
                    $do_not_weld_rule = 4;
                }
            }
        }

        # DO-NOT-WELD RULE 5: do not include welds excluded by user
        if (
              !$do_not_weld_rule
            && %weld_nested_exclusion_rules
            && ( $self->is_excluded_weld( $Kouter_opening, $starting_new_weld )
                || $self->is_excluded_weld( $Kinner_opening, 0 ) )
          )
        {
            $do_not_weld_rule = 5;
        }

        # DO-NOT-WELD RULE 6: This has been merged into RULE 3 above.

        if ($do_not_weld_rule) {

            # After neglecting a pair, we start measuring from start of point
            # io ... but not if previous type does not like to be separated
            # from its container (fixes case b1184)
            my $Kprev     = $self->K_previous_nonblank($Kinner_opening);
            my $type_prev = defined($Kprev) ? $rLL->[$Kprev]->[_TYPE_] : 'w';
            if ( !$has_tight_paren{$type_prev} ) {
                my $starting_level    = $inner_opening->[_LEVEL_];
                my $starting_ci_level = $inner_opening->[_CI_LEVEL_];
                $starting_lentot =
                  $self->cumulative_length_before_K($Kinner_opening);
                $maximum_text_length =
                  $maximum_text_length_at_level[$starting_level] -
                  $starting_ci_level * $rOpts_continuation_indentation;
            }

            if (DEBUG_WELD) {
                $Msg .= "Not welding due to RULE $do_not_weld_rule\n";
                print {*STDOUT} $Msg;
            }

            # Normally, a broken pair should not decrease indentation of
            # intermediate tokens:
            ##      if ( $last_pair_broken ) { next }
            # However, for long strings of welded tokens, such as '{{{{{{...'
            # we will allow broken pairs to also remove indentation.
            # This will keep very long strings of opening and closing
            # braces from marching off to the right.  We will do this if the
            # number of tokens in a weld before the broken weld is 4 or more.
            # This rule will mainly be needed for test scripts, since typical
            # welds have fewer than about 4 welded tokens.
            if ( !@welds || @{ $welds[-1] } < 4 ) { next }
        }

        # otherwise start new weld ...
        elsif ($starting_new_weld) {
            $weld_count_this_start++;
            if (DEBUG_WELD) {
                $Msg .= "Starting new weld\n";
                print {*STDOUT} $Msg;
            }
            push @welds, $item;

            my $parent_seqno = $self->parent_seqno_by_K($Kouter_closing);
            $weld_starts_in_block = $parent_seqno == SEQ_ROOT
              || $rblock_type_of_seqno->{$parent_seqno};

            $rK_weld_right->{$Kouter_opening} = $Kinner_opening;
            $rK_weld_left->{$Kinner_opening}  = $Kouter_opening;

            $rK_weld_right->{$Kinner_closing} = $Kouter_closing;
            $rK_weld_left->{$Kouter_closing}  = $Kinner_closing;
        }

        # ... or extend current weld
        else {
            $weld_count_this_start++;
            if (DEBUG_WELD) {
                $Msg .= "Extending current weld\n";
                print {*STDOUT} $Msg;
            }
            unshift @{ $welds[-1] }, $inner_seqno;
            $rK_weld_right->{$Kouter_opening} = $Kinner_opening;
            $rK_weld_left->{$Kinner_opening}  = $Kouter_opening;

            $rK_weld_right->{$Kinner_closing} = $Kouter_closing;
            $rK_weld_left->{$Kouter_closing}  = $Kinner_closing;

            # Keep a broken container broken at multiple welds.  This might
            # also be useful for simple welds, but for now it is restricted
            # to multiple welds to minimize changes to existing coding.  This
            # fixes b1429, b1430.  Updated for issue c198: but allow a
            # line differences of 1 (simple shear) so that a simple shear
            # can remain or become a single line.
            if ( $iline_ic - $iline_io > 1 ) {

                # Only set this break if it is the last possible weld in this
                # chain.  This will keep some extreme test cases unchanged.
                my $is_chain_end = !@{$rnested_pairs}
                  || $rnested_pairs->[-1]->[1] != $inner_seqno;
                if ($is_chain_end) {
                    $self->[_rbreak_container_]->{$inner_seqno} = 1;
                }
            }
        }

        # After welding, reduce the indentation level if all intermediate tokens
        my $dlevel = $outer_opening->[_LEVEL_] - $inner_opening->[_LEVEL_];
        if ( $dlevel != 0 ) {
            my $Kstart = $Kinner_opening;
            my $Kstop  = $Kinner_closing;
            foreach my $KK ( $Kstart .. $Kstop ) {
                $rLL->[$KK]->[_LEVEL_] += $dlevel;
            }

            # Copy opening ci level to help break at = for -lp mode (case b1124)
            $rLL->[$Kinner_opening]->[_CI_LEVEL_] =
              $rLL->[$Kouter_opening]->[_CI_LEVEL_];

            # But only copy the closing ci level if the outer container is
            # in a block; otherwise poor results can be produced.
            if ($weld_starts_in_block) {
                $rLL->[$Kinner_closing]->[_CI_LEVEL_] =
                  $rLL->[$Kouter_closing]->[_CI_LEVEL_];
            }
        }
    }

    return;
} ## end sub weld_nested_containers

sub weld_nested_quotes {

    # Called once per file for option '--weld-nested-containers'. This
    # does welding on qw quotes.

    my $self = shift;

    # See if quotes are excluded from welding
    my $rflags = $weld_nested_exclusion_rules{'q'};
    return if ( defined($rflags) && defined( $rflags->[1] ) );

    my $rK_weld_left  = $self->[_rK_weld_left_];
    my $rK_weld_right = $self->[_rK_weld_right_];

    my $rLL = $self->[_rLL_];
    return unless ( defined($rLL) && @{$rLL} );
    my $Num = @{$rLL};

    my $K_opening_container = $self->[_K_opening_container_];
    my $K_closing_container = $self->[_K_closing_container_];
    my $rlines              = $self->[_rlines_];

    my $starting_lentot;
    my $maximum_text_length;

    my $is_single_quote = sub {
        my ( $Kbeg, $Kend, $quote_type ) = @_;
        foreach my $K ( $Kbeg .. $Kend ) {
            my $test_type = $rLL->[$K]->[_TYPE_];
            next   if ( $test_type eq 'b' );
            return if ( $test_type ne $quote_type );
        }
        return 1;
    };

    # Length tolerance - same as previously used for sub weld_nested
    my $multiline_tol =
      1 + max( $rOpts_indent_columns, $rOpts_continuation_indentation );

    # look for single qw quotes nested in containers
    my $KNEXT = $self->[_K_first_seq_item_];
    while ( defined($KNEXT) ) {
        my $KK = $KNEXT;
        $KNEXT = $rLL->[$KNEXT]->[_KNEXT_SEQ_ITEM_];
        my $rtoken_vars = $rLL->[$KK];
        my $outer_seqno = $rtoken_vars->[_TYPE_SEQUENCE_];
        if ( !$outer_seqno ) {
            next if ( $KK == 0 );    # first token in file may not be container

            # A fault here implies that an error was made in the little loop at
            # the bottom of sub 'respace_tokens' which set the values of
            # _KNEXT_SEQ_ITEM_.  Or an error has been introduced in the
            # loop control lines above.
            Fault("sequence = $outer_seqno not defined at K=$KK")
              if (DEVEL_MODE);
            next;
        }

        my $token = $rtoken_vars->[_TOKEN_];
        if ( $is_opening_token{$token} ) {

            # see if the next token is a quote of some type
            my $Kn = $KK + 1;
            $Kn += 1
              if ( $Kn < $Num && $rLL->[$Kn]->[_TYPE_] eq 'b' );
            next if ( $Kn >= $Num );

            my $next_token = $rLL->[$Kn]->[_TOKEN_];
            my $next_type  = $rLL->[$Kn]->[_TYPE_];
            next
              unless ( ( $next_type eq 'q' || $next_type eq 'Q' )
                && substr( $next_token, 0, 1 ) eq 'q' );

            # The token before the closing container must also be a quote
            my $Kouter_closing = $K_closing_container->{$outer_seqno};
            my $Kinner_closing = $self->K_previous_nonblank($Kouter_closing);
            next unless $rLL->[$Kinner_closing]->[_TYPE_] eq $next_type;

            # This is an inner opening container
            my $Kinner_opening = $Kn;

            # Do not weld to single-line quotes. Nothing is gained, and it may
            # look bad.
            next if ( $Kinner_closing == $Kinner_opening );

            # Only weld to quotes delimited with container tokens. This is
            # because welding to arbitrary quote delimiters can produce code
            # which is less readable than without welding.
            my $closing_delimiter =
              substr( $rLL->[$Kinner_closing]->[_TOKEN_], -1, 1 );
            next
              unless ( $is_closing_token{$closing_delimiter}
                || $closing_delimiter eq '>' );

            # Now make sure that there is just a single quote in the container
            next
              unless (
                $is_single_quote->(
                    $Kinner_opening + 1,
                    $Kinner_closing - 1,
                    $next_type
                )
              );

            # OK: This is a candidate for welding
            my $Msg = EMPTY_STRING;
            my $do_not_weld;

            my $Kouter_opening = $K_opening_container->{$outer_seqno};
            my $iline_oo       = $rLL->[$Kouter_opening]->[_LINE_INDEX_];
            my $iline_io       = $rLL->[$Kinner_opening]->[_LINE_INDEX_];
            my $iline_oc       = $rLL->[$Kouter_closing]->[_LINE_INDEX_];
            my $iline_ic       = $rLL->[$Kinner_closing]->[_LINE_INDEX_];
            my $is_old_weld =
              ( $iline_oo == $iline_io && $iline_ic == $iline_oc );

            # Fix for case b1189. If quote is marked as type 'Q' then only weld
            # if the two closing tokens are on the same input line.  Otherwise,
            # the closing line will be output earlier in the pipeline than
            # other CODE lines and welding will not actually occur. This will
            # leave a half-welded structure with potential formatting
            # instability.  This might be fixed by adding a check for a weld on
            # a closing Q token and sending it down the normal channel, but it
            # would complicate the code and is potentially risky.
            next
              if (!$is_old_weld
                && $next_type eq 'Q'
                && $iline_ic != $iline_oc );

            # If welded, the line must not exceed allowed line length
            ( my $ok_to_weld, $maximum_text_length, $starting_lentot, my $msg )
              = $self->setup_new_weld_measurements( $Kouter_opening,
                $Kinner_opening );
            if ( !$ok_to_weld ) {
                if (DEBUG_WELD) { print {*STDOUT} $msg }
                next;
            }

            my $length =
              $rLL->[$Kinner_opening]->[_CUMULATIVE_LENGTH_] - $starting_lentot;
            my $excess = $length + $multiline_tol - $maximum_text_length;

            my $excess_max = ( $is_old_weld ? $multiline_tol : 0 );
            if ( $excess >= $excess_max ) {
                $do_not_weld = 1;
            }

            if (DEBUG_WELD) {
                if ( !$is_old_weld ) { $is_old_weld = EMPTY_STRING }
                $Msg .=
"excess=$excess>=$excess_max, multiline_tol=$multiline_tol, is_old_weld='$is_old_weld'\n";
            }

            # Check weld exclusion rules for outer container
            if ( !$do_not_weld ) {
                my $is_leading = !defined( $rK_weld_left->{$Kouter_opening} );
                if ( $self->is_excluded_weld( $KK, $is_leading ) ) {
                    if (DEBUG_WELD) {
                        $Msg .=
"No qw weld due to weld exclusion rules for outer container\n";
                    }
                    $do_not_weld = 1;
                }
            }

            # Check the length of the last line (fixes case b1039)
            if ( !$do_not_weld ) {
                my $rK_range_ic = $rlines->[$iline_ic]->{_rK_range};
                my ( $Kfirst_ic, $Klast_ic ) = @{$rK_range_ic};
                my $excess_ic =
                  $self->excess_line_length_for_Krange( $Kfirst_ic,
                    $Kouter_closing );

                # Allow extra space for additional welded closing container(s)
                # and a space and comma or semicolon.
                # NOTE: weld len has not been computed yet. Use 2 spaces
                # for now, correct for a single weld. This estimate could
                # be made more accurate if necessary.
                my $weld_len =
                  defined( $rK_weld_right->{$Kouter_closing} ) ? 2 : 0;
                if ( $excess_ic + $weld_len + 2 > 0 ) {
                    if (DEBUG_WELD) {
                        $Msg .=
"No qw weld due to excess ending line length=$excess_ic + $weld_len + 2 > 0\n";
                    }
                    $do_not_weld = 1;
                }
            }

            if ($do_not_weld) {
                if (DEBUG_WELD) {
                    $Msg .= "Not Welding QW\n";
                    print {*STDOUT} $Msg;
                }
                next;
            }

            # OK to weld
            if (DEBUG_WELD) {
                $Msg .= "Welding QW\n";
                print {*STDOUT} $Msg;
            }

            $rK_weld_right->{$Kouter_opening} = $Kinner_opening;
            $rK_weld_left->{$Kinner_opening}  = $Kouter_opening;

            $rK_weld_right->{$Kinner_closing} = $Kouter_closing;
            $rK_weld_left->{$Kouter_closing}  = $Kinner_closing;

            # Undo one indentation level if an extra level was added to this
            # multiline quote
            my $qw_seqno =
              $self->[_rstarting_multiline_qw_seqno_by_K_]->{$Kinner_opening};
            if (   $qw_seqno
                && $self->[_rmultiline_qw_has_extra_level_]->{$qw_seqno} )
            {
                foreach my $K ( $Kinner_opening + 1 .. $Kinner_closing - 1 ) {
                    $rLL->[$K]->[_LEVEL_] -= 1;
                }
                $rLL->[$Kinner_opening]->[_CI_LEVEL_] = 0;
                $rLL->[$Kinner_closing]->[_CI_LEVEL_] = 0;
            }

            # undo CI for other welded quotes
            else {

                foreach my $K ( $Kinner_opening .. $Kinner_closing ) {
                    $rLL->[$K]->[_CI_LEVEL_] = 0;
                }
            }

            # Change the level of a closing qw token to be that of the outer
            # containing token. This will allow -lp indentation to function
            # correctly in the vertical aligner.
            # Patch to fix c002: but not if it contains text
            if ( length( $rLL->[$Kinner_closing]->[_TOKEN_] ) == 1 ) {
                $rLL->[$Kinner_closing]->[_LEVEL_] =
                  $rLL->[$Kouter_closing]->[_LEVEL_];
            }
        }
    }
    return;
} ## end sub weld_nested_quotes

sub is_welded_at_seqno {

    my ( $self, $seqno ) = @_;

    # given a sequence number:
    #   return true if it is welded either left or right
    #   return false otherwise
    return unless ( $total_weld_count && defined($seqno) );
    my $KK_o = $self->[_K_opening_container_]->{$seqno};
    return unless defined($KK_o);
    return defined( $self->[_rK_weld_left_]->{$KK_o} )
      || defined( $self->[_rK_weld_right_]->{$KK_o} );
} ## end sub is_welded_at_seqno

sub mark_short_nested_blocks {

    # This routine looks at the entire file and marks any short nested blocks
    # which should not be broken.  The results are stored in the hash
    #     $rshort_nested->{$type_sequence}
    # which will be true if the container should remain intact.
    #
    # For example, consider the following line:

    #   sub cxt_two { sort { $a <=> $b } test_if_list() }

    # The 'sort' block is short and nested within an outer sub block.
    # Normally, the existence of the 'sort' block will force the sub block to
    # break open, but this is not always desirable. Here we will set a flag for
    # the sort block to prevent this.  To give the user control, we will
    # follow the input file formatting.  If either of the blocks is broken in
    # the input file then we will allow it to remain broken. Otherwise we will
    # set a flag to keep it together in later formatting steps.

    # The flag which is set here will be checked in two places:
    # 'sub process_line_of_CODE' and 'sub starting_one_line_block'

    my $self = shift;
    return if $rOpts->{'indent-only'};

    my $rLL = $self->[_rLL_];
    return unless ( defined($rLL) && @{$rLL} );

    return unless ( $rOpts->{'one-line-block-nesting'} );

    my $K_opening_container  = $self->[_K_opening_container_];
    my $K_closing_container  = $self->[_K_closing_container_];
    my $rbreak_container     = $self->[_rbreak_container_];
    my $ris_broken_container = $self->[_ris_broken_container_];
    my $rshort_nested        = $self->[_rshort_nested_];
    my $rblock_type_of_seqno = $self->[_rblock_type_of_seqno_];

    # Variables needed for estimating line lengths
    my $maximum_text_length;
    my $starting_lentot;
    my $length_tol = 1;

    my $excess_length_to_K = sub {
        my ($K) = @_;

        # Estimate the length from the line start to a given token
        my $length = $self->cumulative_length_before_K($K) - $starting_lentot;
        my $excess_length = $length + $length_tol - $maximum_text_length;
        return ($excess_length);
    };

    # loop over all containers
    my @open_block_stack;
    my $iline = -1;
    my $KNEXT = $self->[_K_first_seq_item_];
    while ( defined($KNEXT) ) {
        my $KK = $KNEXT;
        $KNEXT = $rLL->[$KNEXT]->[_KNEXT_SEQ_ITEM_];
        my $rtoken_vars   = $rLL->[$KK];
        my $type_sequence = $rtoken_vars->[_TYPE_SEQUENCE_];
        if ( !$type_sequence ) {
            next if ( $KK == 0 );    # first token in file may not be container

            # A fault here implies that an error was made in the little loop at
            # the bottom of sub 'respace_tokens' which set the values of
            # _KNEXT_SEQ_ITEM_.  Or an error has been introduced in the
            # loop control lines above.
            Fault("sequence = $type_sequence not defined at K=$KK")
              if (DEVEL_MODE);
            next;
        }

        # Patch: do not mark short blocks with welds.
        # In some cases blinkers can form (case b690).
        if ( $total_weld_count && $self->is_welded_at_seqno($type_sequence) ) {
            next;
        }

        # We are just looking at code blocks
        my $token = $rtoken_vars->[_TOKEN_];
        my $type  = $rtoken_vars->[_TYPE_];
        next unless ( $type eq $token );
        next unless ( $rblock_type_of_seqno->{$type_sequence} );

        # Keep a stack of all acceptable block braces seen.
        # Only consider blocks entirely on one line so dump the stack when line
        # changes.
        my $iline_last = $iline;
        $iline = $rLL->[$KK]->[_LINE_INDEX_];
        if ( $iline != $iline_last ) { @open_block_stack = () }

        if ( $token eq '}' ) {
            if (@open_block_stack) { pop @open_block_stack }
        }
        next unless ( $token eq '{' );

        # block must be balanced (bad scripts may be unbalanced)
        my $K_opening = $K_opening_container->{$type_sequence};
        my $K_closing = $K_closing_container->{$type_sequence};
        next unless ( defined($K_opening) && defined($K_closing) );

        # require that this block be entirely on one line
        next
          if ( $ris_broken_container->{$type_sequence}
            || $rbreak_container->{$type_sequence} );

        # See if this block fits on one line of allowed length (which may
        # be different from the input script)
        $starting_lentot =
          $KK <= 0 ? 0 : $rLL->[ $KK - 1 ]->[_CUMULATIVE_LENGTH_];
        my $level    = $rLL->[$KK]->[_LEVEL_];
        my $ci_level = $rLL->[$KK]->[_CI_LEVEL_];
        $maximum_text_length =
          $maximum_text_length_at_level[$level] -
          $ci_level * $rOpts_continuation_indentation;

        # Dump the stack if block is too long and skip this block
        if ( $excess_length_to_K->($K_closing) > 0 ) {
            @open_block_stack = ();
            next;
        }

        # OK, Block passes tests, remember it
        push @open_block_stack, $type_sequence;

        # We are only marking nested code blocks,
        # so check for a previous block on the stack
        next if ( @open_block_stack <= 1 );

        # Looks OK, mark this as a short nested block
        $rshort_nested->{$type_sequence} = 1;

    }
    return;
} ## end sub mark_short_nested_blocks

sub special_indentation_adjustments {

    my ($self) = @_;

    # Called once per file to define the levels to be used for computing
    # actual indentation. These levels are initialized to be the structural
    # levels and then are adjusted if necessary for special purposes.
    # The adjustments are made either by changing _CI_LEVEL_ directly or
    # by setting modified levels in the array $self->[_radjusted_levels_].

    # NOTE: This routine is called after the weld routines, which may have
    # already adjusted the initial values of _LEVEL_, so we are making
    # adjustments on top of those levels.  It would be nicer to have the
    # weld routines also use this adjustment, but that gets complicated
    # when we combine -gnu -wn and also have some welded quotes.
    my $Klimit           = $self->[_Klimit_];
    my $rLL              = $self->[_rLL_];
    my $radjusted_levels = $self->[_radjusted_levels_];

    return unless ( defined($Klimit) );

    # Initialize the adjusted levels to be the structural levels
    foreach my $KK ( 0 .. $Klimit ) {
        $radjusted_levels->[$KK] = $rLL->[$KK]->[_LEVEL_];
    }

    # First set adjusted levels for any non-indenting braces.
    $self->do_non_indenting_braces();

    # Adjust breaks and indentation list containers
    $self->break_before_list_opening_containers();

    # Set adjusted levels for the whitespace cycle option.
    $self->whitespace_cycle_adjustment();

    $self->braces_left_setup();

    # Adjust continuation indentation if -bli is set
    $self->bli_adjustment();

    $self->extended_ci()
      if ($rOpts_extended_continuation_indentation);

    # Now clip any adjusted levels to be non-negative
    $self->clip_adjusted_levels();

    return;
} ## end sub special_indentation_adjustments

sub clip_adjusted_levels {

    # Replace any negative adjusted levels with zero.
    # Negative levels can occur in files with brace errors.
    my ($self) = @_;
    my $radjusted_levels = $self->[_radjusted_levels_];
    return unless defined($radjusted_levels) && @{$radjusted_levels};
    my $min = min( @{$radjusted_levels} );    # fast check for min
    if ( $min < 0 ) {

        # slow loop, but rarely needed
        foreach ( @{$radjusted_levels} ) { $_ = 0 if ( $_ < 0 ) }
    }
    return;
} ## end sub clip_adjusted_levels

sub do_non_indenting_braces {

    # Called once per file to handle the --non-indenting-braces parameter.
    # Remove indentation within marked braces if requested
    my ($self) = @_;

    # Any non-indenting braces have been found by sub find_non_indenting_braces
    # and are defined by the following hash:
    my $rseqno_non_indenting_brace_by_ix =
      $self->[_rseqno_non_indenting_brace_by_ix_];
    return unless ( %{$rseqno_non_indenting_brace_by_ix} );

    my $rlines                     = $self->[_rlines_];
    my $K_opening_container        = $self->[_K_opening_container_];
    my $K_closing_container        = $self->[_K_closing_container_];
    my $rspecial_side_comment_type = $self->[_rspecial_side_comment_type_];
    my $radjusted_levels           = $self->[_radjusted_levels_];

    # First locate all of the marked blocks
    my @K_stack;
    foreach my $ix ( keys %{$rseqno_non_indenting_brace_by_ix} ) {
        my $seqno          = $rseqno_non_indenting_brace_by_ix->{$ix};
        my $KK             = $K_opening_container->{$seqno};
        my $line_of_tokens = $rlines->[$ix];
        my $rK_range       = $line_of_tokens->{_rK_range};
        my ( $Kfirst, $Klast ) = @{$rK_range};
        $rspecial_side_comment_type->{$Klast} = 'NIB';
        push @K_stack, [ $KK, 1 ];
        my $Kc = $K_closing_container->{$seqno};
        push @K_stack, [ $Kc, -1 ] if ( defined($Kc) );
    }
    return unless (@K_stack);
    @K_stack = sort { $a->[0] <=> $b->[0] } @K_stack;

    # Then loop to remove indentation within marked blocks
    my $KK_last = 0;
    my $ndeep   = 0;
    foreach my $item (@K_stack) {
        my ( $KK, $inc ) = @{$item};
        if ( $ndeep > 0 ) {

            foreach ( $KK_last + 1 .. $KK ) {
                $radjusted_levels->[$_] -= $ndeep;
            }

            # We just subtracted the old $ndeep value, which only applies to a
            # '{'.  The new $ndeep applies to a '}', so we undo the error.
            if ( $inc < 0 ) { $radjusted_levels->[$KK] += 1 }
        }

        $ndeep += $inc;
        $KK_last = $KK;
    }
    return;
} ## end sub do_non_indenting_braces

sub whitespace_cycle_adjustment {

    my $self = shift;

    # Called once per file to implement the --whitespace-cycle option
    my $rLL = $self->[_rLL_];
    return unless ( defined($rLL) && @{$rLL} );
    my $radjusted_levels = $self->[_radjusted_levels_];
    my $maximum_level    = $self->[_maximum_level_];

    if (   $rOpts_whitespace_cycle
        && $rOpts_whitespace_cycle > 0
        && $rOpts_whitespace_cycle < $maximum_level )
    {

        my $Kmax = @{$rLL} - 1;

        my $whitespace_last_level  = -1;
        my @whitespace_level_stack = ();
        my $last_nonblank_type     = 'b';
        my $last_nonblank_token    = EMPTY_STRING;
        foreach my $KK ( 0 .. $Kmax ) {
            my $level_abs = $radjusted_levels->[$KK];
            my $level     = $level_abs;
            if ( $level_abs < $whitespace_last_level ) {
                pop(@whitespace_level_stack);
            }
            if ( !@whitespace_level_stack ) {
                push @whitespace_level_stack, $level_abs;
            }
            else {
                if ( $level_abs > $whitespace_last_level ) {
                    $level = $whitespace_level_stack[-1] +
                      ( $level_abs - $whitespace_last_level );

                    if (
                        # 1 Try to break at a block brace
                        (
                               $level > $rOpts_whitespace_cycle
                            && $last_nonblank_type eq '{'
                            && $last_nonblank_token eq '{'
                        )

                        # 2 Then either a brace or bracket
                        || (   $level > $rOpts_whitespace_cycle + 1
                            && $last_nonblank_token =~ /^[\{\[]$/ )

                        # 3 Then a paren too
                        || $level > $rOpts_whitespace_cycle + 2
                      )
                    {
                        $level = 1;
                    }
                    push @whitespace_level_stack, $level;
                }
            }
            $level = $whitespace_level_stack[-1];
            $radjusted_levels->[$KK] = $level;

            $whitespace_last_level = $level_abs;
            my $type  = $rLL->[$KK]->[_TYPE_];
            my $token = $rLL->[$KK]->[_TOKEN_];
            if ( $type ne 'b' ) {
                $last_nonblank_type  = $type;
                $last_nonblank_token = $token;
            }
        }
    }
    return;
} ## end sub whitespace_cycle_adjustment

use constant DEBUG_BBX => 0;

sub break_before_list_opening_containers {

    my ($self) = @_;

    # This routine is called once per batch to implement parameters
    # --break-before-hash-brace=n and similar -bbx=n flags
    #    and their associated indentation flags:
    # --break-before-hash-brace-and-indent and similar -bbxi=n

    # Nothing to do if none of the -bbx=n parameters has been set
    return unless %break_before_container_types;

    my $rLL = $self->[_rLL_];
    return unless ( defined($rLL) && @{$rLL} );

    # Loop over all opening container tokens
    my $K_opening_container       = $self->[_K_opening_container_];
    my $K_closing_container       = $self->[_K_closing_container_];
    my $ris_broken_container      = $self->[_ris_broken_container_];
    my $ris_permanently_broken    = $self->[_ris_permanently_broken_];
    my $rhas_list                 = $self->[_rhas_list_];
    my $rhas_broken_list_with_lec = $self->[_rhas_broken_list_with_lec_];
    my $radjusted_levels          = $self->[_radjusted_levels_];
    my $rparent_of_seqno          = $self->[_rparent_of_seqno_];
    my $rlines                    = $self->[_rlines_];
    my $rtype_count_by_seqno      = $self->[_rtype_count_by_seqno_];
    my $rlec_count_by_seqno       = $self->[_rlec_count_by_seqno_];
    my $rno_xci_by_seqno          = $self->[_rno_xci_by_seqno_];
    my $rK_weld_right             = $self->[_rK_weld_right_];
    my $rblock_type_of_seqno      = $self->[_rblock_type_of_seqno_];

    my $length_tol =
      max( 1, $rOpts_continuation_indentation, $rOpts_indent_columns );
    if ($rOpts_ignore_old_breakpoints) {

        # Patch suggested by b1231; the old tol was excessive.
        ## $length_tol += $rOpts_maximum_line_length;
        $length_tol *= 2;
    }

    my $rbreak_before_container_by_seqno = {};
    my $rwant_reduced_ci                 = {};
    foreach my $seqno ( keys %{$K_opening_container} ) {

        #----------------------------------------------------------------
        # Part 1: Examine any -bbx=n flags
        #----------------------------------------------------------------

        next if ( $rblock_type_of_seqno->{$seqno} );
        my $KK = $K_opening_container->{$seqno};

        # This must be a list or contain a list.
        # Note1: switched from 'has_broken_list' to 'has_list' to fix b1024.
        # Note2: 'has_list' holds the depth to the sub-list.  We will require
        #  a depth of just 1
        my $is_list  = $self->is_list_by_seqno($seqno);
        my $has_list = $rhas_list->{$seqno};

        # Fix for b1173: if welded opening container, use flag of innermost
        # seqno.  Otherwise, the restriction $has_list==1 prevents triple and
        # higher welds from following the -BBX parameters.
        if ($total_weld_count) {
            my $KK_test = $rK_weld_right->{$KK};
            if ( defined($KK_test) ) {
                my $seqno_inner = $rLL->[$KK_test]->[_TYPE_SEQUENCE_];
                $is_list ||= $self->is_list_by_seqno($seqno_inner);
                $has_list = $rhas_list->{$seqno_inner};
            }
        }

        next unless ( $is_list || $has_list && $has_list == 1 );

        my $has_list_with_lec = $rhas_broken_list_with_lec->{$seqno};

        # Only for types of container tokens with a non-default break option
        my $token        = $rLL->[$KK]->[_TOKEN_];
        my $break_option = $break_before_container_types{$token};
        next unless ($break_option);

        # Do not use -bbx under stress for stability ... fixes b1300
        # TODO: review this; do we also need to look at stress_level_lalpha?
        my $level = $rLL->[$KK]->[_LEVEL_];
        if ( $level >= $stress_level_beta ) {
            DEBUG_BBX
              && print
"BBX: Switching off at $seqno: level=$level exceeds beta stress level=$stress_level_beta\n";
            next;
        }

        # Require previous nonblank to be '=' or '=>'
        my $Kprev = $KK - 1;
        next if ( $Kprev < 0 );
        my $prev_type = $rLL->[$Kprev]->[_TYPE_];
        if ( $prev_type eq 'b' ) {
            $Kprev--;
            next if ( $Kprev < 0 );
            $prev_type = $rLL->[$Kprev]->[_TYPE_];
        }
        next unless ( $is_equal_or_fat_comma{$prev_type} );

        my $ci = $rLL->[$KK]->[_CI_LEVEL_];

        #--------------------------------------------
        # New coding for option 2 (break if complex).
        #--------------------------------------------
        # This new coding uses clues which are invariant under formatting to
        # decide if a list is complex.  For now it is only applied when -lp
        # and -vmll are used, but eventually it may become the standard method.
        # Fixes b1274, b1275, and others, including b1099.
        if ( $break_option == 2 ) {

            if (   $rOpts_line_up_parentheses
                || $rOpts_variable_maximum_line_length )
            {

                # Start with the basic definition of a complex list...
                my $is_complex = $is_list && $has_list;

                # and it is also complex if the parent is a list
                if ( !$is_complex ) {
                    my $parent = $rparent_of_seqno->{$seqno};
                    if ( $self->is_list_by_seqno($parent) ) {
                        $is_complex = 1;
                    }
                }

                # finally, we will call it complex if there are inner opening
                # and closing container tokens, not parens, within the outer
                # container tokens.
                if ( !$is_complex ) {
                    my $Kp      = $self->K_next_nonblank($KK);
                    my $token_p = defined($Kp) ? $rLL->[$Kp]->[_TOKEN_] : 'b';
                    if ( $is_opening_token{$token_p} && $token_p ne '(' ) {

                        my $Kc = $K_closing_container->{$seqno};
                        my $Km = $self->K_previous_nonblank($Kc);
                        my $token_m =
                          defined($Km) ? $rLL->[$Km]->[_TOKEN_] : 'b';

                        # ignore any optional ending comma
                        if ( $token_m eq ',' ) {
                            $Km = $self->K_previous_nonblank($Km);
                            $token_m =
                              defined($Km) ? $rLL->[$Km]->[_TOKEN_] : 'b';
                        }

                        $is_complex ||=
                          $is_closing_token{$token_m} && $token_m ne ')';
                    }
                }

                # Convert to option 3 (always break) if complex
                next unless ($is_complex);
                $break_option = 3;
            }
        }

        # Fix for b1231: the has_list_with_lec does not cover all cases.
        # A broken container containing a list and with line-ending commas
        # will stay broken, so can be treated as if it had a list with lec.
        $has_list_with_lec ||=
             $has_list
          && $ris_broken_container->{$seqno}
          && $rlec_count_by_seqno->{$seqno};

        DEBUG_BBX
          && print {*STDOUT}
"BBX: Looking at seqno=$seqno, token = $token with option=$break_option\n";

        # -bbx=1 = stable, try to follow input
        if ( $break_option == 1 ) {

            my $iline    = $rLL->[$KK]->[_LINE_INDEX_];
            my $rK_range = $rlines->[$iline]->{_rK_range};
            my ( $Kfirst, $Klast ) = @{$rK_range};
            next unless ( $KK == $Kfirst );
        }

        # -bbx=2 => apply this style only for a 'complex' list
        elsif ( $break_option == 2 ) {

            #  break if this list contains a broken list with line-ending comma
            my $ok_to_break;
            my $Msg = EMPTY_STRING;
            if ($has_list_with_lec) {
                $ok_to_break = 1;
                DEBUG_BBX && do { $Msg = "has list with lec;" };
            }

            if ( !$ok_to_break ) {

                # Turn off -xci if -bbx=2 and this container has a sublist but
                # not a broken sublist. This avoids creating blinkers.  The
                # problem is that -xci can cause one-line lists to break open,
                # and thereby creating formatting instability.
                # This fixes cases b1033 b1036 b1037 b1038 b1042 b1043 b1044
                # b1045 b1046 b1047 b1051 b1052 b1061.
                if ($has_list) { $rno_xci_by_seqno->{$seqno} = 1 }

                my $parent = $rparent_of_seqno->{$seqno};
                if ( $self->is_list_by_seqno($parent) ) {
                    DEBUG_BBX && do { $Msg = "parent is list" };
                    $ok_to_break = 1;
                }
            }

            if ( !$ok_to_break ) {
                DEBUG_BBX
                  && print {*STDOUT} "Not breaking at seqno=$seqno: $Msg\n";
                next;
            }

            DEBUG_BBX
              && print {*STDOUT} "OK to break at seqno=$seqno: $Msg\n";

            # Patch: turn off -xci if -bbx=2 and -lp
            # This fixes cases b1090 b1095 b1101 b1116 b1118 b1121 b1122
            $rno_xci_by_seqno->{$seqno} = 1 if ($rOpts_line_up_parentheses);
        }

        # -bbx=3 = always break
        elsif ( $break_option == 3 ) {

            # ok to break
        }

        # Shouldn't happen! Bad flag, but make behavior same as 3
        else {
            # ok to break
        }

        # Set a flag for actual implementation later in
        # sub insert_breaks_before_list_opening_containers
        $rbreak_before_container_by_seqno->{$seqno} = 1;
        DEBUG_BBX
          && print {*STDOUT} "BBX: ok to break at seqno=$seqno\n";

        # -bbxi=0: Nothing more to do if the ci value remains unchanged
        my $ci_flag = $container_indentation_options{$token};
        next unless ($ci_flag);

        # -bbxi=1: This option removes ci and is handled in
        # later sub get_final_indentation
        if ( $ci_flag == 1 ) {
            $rwant_reduced_ci->{$seqno} = 1;
            next;
        }

        # -bbxi=2: This option changes the level ...
        # This option can conflict with -xci in some cases.  We can turn off
        # -xci for this container to avoid blinking.  For now, only do this if
        # -vmll is set.  ( fixes b1335, b1336 )
        if ($rOpts_variable_maximum_line_length) {
            $rno_xci_by_seqno->{$seqno} = 1;
        }

        #----------------------------------------------------------------
        # Part 2: Perform tests before committing to changing ci and level
        #----------------------------------------------------------------

        # Before changing the ci level of the opening container, we need
        # to be sure that the container will be broken in the later stages of
        # formatting.  We have to do this because we are working early in the
        # formatting pipeline.  A problem can occur if we change the ci or
        # level of the opening token but do not actually break the container
        # open as expected.  In most cases it wouldn't make any difference if
        # we changed ci or not, but there are some edge cases where this
        # can cause blinking states, so we need to try to only change ci if
        # the container will really be broken.

        # Only consider containers already broken
        next if ( !$ris_broken_container->{$seqno} );

        # Patch to fix issue b1305: the combination of -naws and ci>i appears
        # to cause an instability.  It should almost never occur in practice.
        next
          if (!$rOpts_add_whitespace
            && $rOpts_continuation_indentation > $rOpts_indent_columns );

        # Always ok to change ci for permanently broken containers
        if ( $ris_permanently_broken->{$seqno} ) { }

        # Always OK if this list contains a broken sub-container with
        # a non-terminal line-ending comma
        elsif ($has_list_with_lec) { }

        # Otherwise, we are considering a single container...
        else {

            # A single container must have at least 1 line-ending comma:
            next unless ( $rlec_count_by_seqno->{$seqno} );

            my $OK;

            # Since it has a line-ending comma, it will stay broken if the
            # -boc flag is set
            if ($rOpts_break_at_old_comma_breakpoints) { $OK = 1 }

            # OK if the container contains multiple fat commas
            # Better: multiple lines with fat commas
            if ( !$OK && !$rOpts_ignore_old_breakpoints ) {
                my $rtype_count = $rtype_count_by_seqno->{$seqno};
                next unless ($rtype_count);
                my $fat_comma_count = $rtype_count->{'=>'};
                DEBUG_BBX
                  && print {*STDOUT} "BBX: fat comma count=$fat_comma_count\n";
                if ( $fat_comma_count && $fat_comma_count >= 2 ) { $OK = 1 }
            }

            # The last check we can make is to see if this container could
            # fit on a single line.  Use the least possible indentation
            # estimate, ci=0, so we are not subtracting $ci *
            # $rOpts_continuation_indentation from tabulated
            # $maximum_text_length  value.
            if ( !$OK ) {
                my $maximum_text_length = $maximum_text_length_at_level[$level];
                my $K_closing           = $K_closing_container->{$seqno};
                my $length = $self->cumulative_length_before_K($K_closing) -
                  $self->cumulative_length_before_K($KK);
                my $excess_length = $length - $maximum_text_length;
                DEBUG_BBX
                  && print {*STDOUT}
"BBX: excess=$excess_length: maximum_text_length=$maximum_text_length, length=$length, ci=$ci\n";

                # OK if the net container definitely breaks on length
                if ( $excess_length > $length_tol ) {
                    $OK = 1;
                    DEBUG_BBX
                      && print {*STDOUT} "BBX: excess_length=$excess_length\n";
                }

                # Otherwise skip it
                else { next }
            }
        }

        #------------------------------------------------------------
        # Part 3: Looks OK: apply -bbx=n and any related -bbxi=n flag
        #------------------------------------------------------------

        DEBUG_BBX && print {*STDOUT} "BBX: OK to break\n";

        # -bbhbi=n
        # -bbsbi=n
        # -bbpi=n

        # where:

        # n=0  default indentation (usually one ci)
        # n=1  outdent one ci
        # n=2  indent one level (minus one ci)
        # n=3  indent one extra ci [This may be dropped]

        # NOTE: We are adjusting indentation of the opening container. The
        # closing container will normally follow the indentation of the opening
        # container automatically, so this is not currently done.
        next unless ($ci);

        # option 1: outdent
        if ( $ci_flag == 1 ) {
            $ci -= 1;
        }

        # option 2: indent one level
        elsif ( $ci_flag == 2 ) {
            $ci -= 1;
            $radjusted_levels->[$KK] += 1;
        }

        # unknown option
        else {
            # Shouldn't happen - leave ci unchanged
        }

        $rLL->[$KK]->[_CI_LEVEL_] = $ci if ( $ci >= 0 );
    }

    $self->[_rbreak_before_container_by_seqno_] =
      $rbreak_before_container_by_seqno;
    $self->[_rwant_reduced_ci_] = $rwant_reduced_ci;
    return;
} ## end sub break_before_list_opening_containers

use constant DEBUG_XCI => 0;

sub extended_ci {

    # This routine implements the -xci (--extended-continuation-indentation)
    # flag.  We add CI to interior tokens of a container which itself has CI but
    # only if a token does not already have CI.

    # To do this, we will locate opening tokens which themselves have
    # continuation indentation (CI).  We track them with their sequence
    # numbers.  These sequence numbers are called 'controlling sequence
    # numbers'.  They apply continuation indentation to the tokens that they
    # contain.  These inner tokens remember their controlling sequence numbers.
    # Later, when these inner tokens are output, they have to see if the output
    # lines with their controlling tokens were output with CI or not.  If not,
    # then they must remove their CI too.

    # The controlling CI concept works hierarchically.  But CI itself is not
    # hierarchical; it is either on or off. There are some rare instances where
    # it would be best to have hierarchical CI too, but not enough to be worth
    # the programming effort.

    # The operations to remove unwanted CI are done in sub 'undo_ci'.

    my ($self) = @_;

    my $rLL = $self->[_rLL_];
    return unless ( defined($rLL) && @{$rLL} );

    my $ris_list_by_seqno        = $self->[_ris_list_by_seqno_];
    my $ris_seqno_controlling_ci = $self->[_ris_seqno_controlling_ci_];
    my $rseqno_controlling_my_ci = $self->[_rseqno_controlling_my_ci_];
    my $rno_xci_by_seqno         = $self->[_rno_xci_by_seqno_];
    my $ris_bli_container        = $self->[_ris_bli_container_];
    my $rblock_type_of_seqno     = $self->[_rblock_type_of_seqno_];

    my %available_space;

    # Loop over all opening container tokens
    my $K_opening_container = $self->[_K_opening_container_];
    my $K_closing_container = $self->[_K_closing_container_];
    my @seqno_stack;
    my $seqno_top;
    my $KLAST;
    my $KNEXT = $self->[_K_first_seq_item_];

    # The following variable can be used to allow a little extra space to
    # avoid blinkers.  A value $len_tol = 20 fixed the following
    # fixes cases: b1025 b1026 b1027 b1028 b1029 b1030 but NOT b1031.
    # It turned out that the real problem was mis-parsing a list brace as
    # a code block in a 'use' statement when the line length was extremely
    # small.  A value of 0 works now, but a slightly larger value can
    # be used to minimize the chance of a blinker.
    my $len_tol = 0;

    while ( defined($KNEXT) ) {

        # Fix all tokens up to the next sequence item if we are changing CI
        if ($seqno_top) {

            my $is_list = $ris_list_by_seqno->{$seqno_top};
            my $space   = $available_space{$seqno_top};
            my $count   = 0;
            foreach my $Kt ( $KLAST + 1 .. $KNEXT - 1 ) {

                next if ( $rLL->[$Kt]->[_CI_LEVEL_] );

                # But do not include tokens which might exceed the line length
                # and are not in a list.
                # ... This fixes case b1031
                if (   $is_list
                    || $rLL->[$Kt]->[_TOKEN_LENGTH_] < $space
                    || $rLL->[$Kt]->[_TYPE_] eq '#' )
                {
                    $rLL->[$Kt]->[_CI_LEVEL_] = 1;
                    $rseqno_controlling_my_ci->{$Kt} = $seqno_top;
                    $count++;
                }
            }
            $ris_seqno_controlling_ci->{$seqno_top} += $count;
        }

        $KLAST = $KNEXT;
        my $KK = $KNEXT;
        $KNEXT = $rLL->[$KNEXT]->[_KNEXT_SEQ_ITEM_];

        my $seqno = $rLL->[$KK]->[_TYPE_SEQUENCE_];

        # see if we have reached the end of the current controlling container
        if ( $seqno_top && $seqno == $seqno_top ) {
            $seqno_top = pop @seqno_stack;
        }

        # Patch to fix some block types...
        # Certain block types arrive from the tokenizer without CI but should
        # have it for this option.  These include anonymous subs and
        #     do sort map grep eval
        my $block_type = $rblock_type_of_seqno->{$seqno};
        if ( $block_type && $is_block_with_ci{$block_type} ) {
            $rLL->[$KK]->[_CI_LEVEL_] = 1;
            if ($seqno_top) {
                $rseqno_controlling_my_ci->{$KK} = $seqno_top;
                $ris_seqno_controlling_ci->{$seqno_top}++;
            }
        }

        # If this does not have ci, update ci if necessary and continue looking
        else {
            if ( !$rLL->[$KK]->[_CI_LEVEL_] ) {
                if ($seqno_top) {
                    $rLL->[$KK]->[_CI_LEVEL_] = 1;
                    $rseqno_controlling_my_ci->{$KK} = $seqno_top;
                    $ris_seqno_controlling_ci->{$seqno_top}++;
                }
                next;
            }
        }

        # We are looking for opening container tokens with ci
        my $K_opening = $K_opening_container->{$seqno};
        next unless ( defined($K_opening) && $KK == $K_opening );

        # Make sure there is a corresponding closing container
        # (could be missing if the script has a brace error)
        my $K_closing = $K_closing_container->{$seqno};
        next unless defined($K_closing);

        # Skip if requested by -bbx to avoid blinkers
        next if ( $rno_xci_by_seqno->{$seqno} );

        # Skip if this is a -bli container (this fixes case b1065) Note: case
        # b1065 is also fixed by the update for b1055, so this update is not
        # essential now.  But there does not seem to be a good reason to add
        # xci and bli together, so the update is retained.
        next if ( $ris_bli_container->{$seqno} );

        # Require different input lines. This will filter out a large number
        # of small hash braces and array brackets.  If we accidentally filter
        # out an important container, it will get fixed on the next pass.
        if (
            $rLL->[$K_opening]->[_LINE_INDEX_] ==
            $rLL->[$K_closing]->[_LINE_INDEX_]
            && ( $rLL->[$K_closing]->[_CUMULATIVE_LENGTH_] -
                $rLL->[$K_opening]->[_CUMULATIVE_LENGTH_] >
                $rOpts_maximum_line_length )
          )
        {
            DEBUG_XCI
              && print "XCI: Skipping seqno=$seqno, require different lines\n";
            next;
        }

        # Do not apply -xci if adding extra ci will put the container contents
        # beyond the line length limit (fixes cases b899 b935)
        my $level    = $rLL->[$K_opening]->[_LEVEL_];
        my $ci_level = $rLL->[$K_opening]->[_CI_LEVEL_];
        my $maximum_text_length =
          $maximum_text_length_at_level[$level] -
          $ci_level * $rOpts_continuation_indentation;

        # Fix for b1197 b1198 b1199 b1200 b1201 b1202
        # Do not apply -xci if we are running out of space
        # TODO: review this; do we also need to look at stress_level_alpha?
        if ( $level >= $stress_level_beta ) {
            DEBUG_XCI
              && print
"XCI: Skipping seqno=$seqno, level=$level exceeds stress level=$stress_level_beta\n";
            next;
        }

        # remember how much space is available for patch b1031 above
        my $space =
          $maximum_text_length - $len_tol - $rOpts_continuation_indentation;

        if ( $space < 0 ) {
            DEBUG_XCI && print "XCI: Skipping seqno=$seqno, space=$space\n";
            next;
        }
        DEBUG_XCI && print "XCI: OK seqno=$seqno, space=$space\n";

        $available_space{$seqno} = $space;

        # This becomes the next controlling container
        push @seqno_stack, $seqno_top if ($seqno_top);
        $seqno_top = $seqno;
    }
    return;
} ## end sub extended_ci

sub braces_left_setup {

    # Called once per file to mark all -bl, -sbl, and -asbl containers
    my $self = shift;

    my $rOpts_bl   = $rOpts->{'opening-brace-on-new-line'};
    my $rOpts_sbl  = $rOpts->{'opening-sub-brace-on-new-line'};
    my $rOpts_asbl = $rOpts->{'opening-anonymous-sub-brace-on-new-line'};
    return unless ( $rOpts_bl || $rOpts_sbl || $rOpts_asbl );

    my $rLL = $self->[_rLL_];
    return unless ( defined($rLL) && @{$rLL} );

    # We will turn on this hash for braces controlled by these flags:
    my $rbrace_left = $self->[_rbrace_left_];

    my $rblock_type_of_seqno = $self->[_rblock_type_of_seqno_];
    my $ris_asub_block       = $self->[_ris_asub_block_];
    my $ris_sub_block        = $self->[_ris_sub_block_];
    foreach my $seqno ( keys %{$rblock_type_of_seqno} ) {

        my $block_type = $rblock_type_of_seqno->{$seqno};

        # use -asbl flag for an anonymous sub block
        if ( $ris_asub_block->{$seqno} ) {
            if ($rOpts_asbl) {
                $rbrace_left->{$seqno} = 1;
            }
        }

        # use -sbl flag for a named sub
        elsif ( $ris_sub_block->{$seqno} ) {
            if ($rOpts_sbl) {
                $rbrace_left->{$seqno} = 1;
            }
        }

        # use -bl flag if not a sub block of any type
        else {
            if (   $rOpts_bl
                && $block_type =~ /$bl_pattern/
                && $block_type !~ /$bl_exclusion_pattern/ )
            {
                $rbrace_left->{$seqno} = 1;
            }
        }
    }
    return;
} ## end sub braces_left_setup

sub bli_adjustment {

    # Called once per file to implement the --brace-left-and-indent option.
    # If -bli is set, adds one continuation indentation for certain braces
    my $self = shift;
    return unless ( $rOpts->{'brace-left-and-indent'} );
    my $rLL = $self->[_rLL_];
    return unless ( defined($rLL) && @{$rLL} );

    my $rblock_type_of_seqno = $self->[_rblock_type_of_seqno_];
    my $ris_bli_container    = $self->[_ris_bli_container_];
    my $rbrace_left          = $self->[_rbrace_left_];
    my $K_opening_container  = $self->[_K_opening_container_];
    my $K_closing_container  = $self->[_K_closing_container_];

    foreach my $seqno ( keys %{$rblock_type_of_seqno} ) {
        my $block_type = $rblock_type_of_seqno->{$seqno};
        if (   $block_type
            && $block_type =~ /$bli_pattern/
            && $block_type !~ /$bli_exclusion_pattern/ )
        {
            $ris_bli_container->{$seqno} = 1;
            $rbrace_left->{$seqno}       = 1;
            my $Ko = $K_opening_container->{$seqno};
            my $Kc = $K_closing_container->{$seqno};
            if ( defined($Ko) && defined($Kc) ) {
                $rLL->[$Kc]->[_CI_LEVEL_] = ++$rLL->[$Ko]->[_CI_LEVEL_];
            }
        }
    }
    return;
} ## end sub bli_adjustment

sub find_multiline_qw {

    my ( $self, $rqw_lines ) = @_;

    # Multiline qw quotes are not sequenced items like containers { [ (
    # but behave in some respects in a similar way. So this routine finds them
    # and creates a separate sequence number system for later use.

    # This is straightforward because they always begin at the end of one line
    # and end at the beginning of a later line. This is true no matter how we
    # finally make our line breaks, so we can find them before deciding on new
    # line breaks.

    # Input parameter:
    #   if $rqw_lines is defined it is a ref to array of all line index numbers
    #   for which there is a type 'q' qw quote at either end of the line. This
    #   was defined by sub resync_lines_and_tokens for efficiency.
    #

    my $rlines = $self->[_rlines_];

    # if $rqw_lines is not defined (this will occur with -io option) then we
    # will have to scan all lines.
    if ( !defined($rqw_lines) ) {
        $rqw_lines = [ 0 .. @{$rlines} - 1 ];
    }

    # if $rqw_lines is defined but empty, just return because there are no
    # multiline qw's
    else {
        if ( !@{$rqw_lines} ) { return }
    }

    my $rstarting_multiline_qw_seqno_by_K = {};
    my $rending_multiline_qw_seqno_by_K   = {};
    my $rKrange_multiline_qw_by_seqno     = {};
    my $rmultiline_qw_has_extra_level     = {};

    my $ris_excluded_lp_container = $self->[_ris_excluded_lp_container_];

    my $rLL = $self->[_rLL_];
    my $qw_seqno;
    my $num_qw_seqno = 0;
    my $K_start_multiline_qw;

    # For reference, here is the old loop, before $rqw_lines became available:
    ##  foreach my $line_of_tokens ( @{$rlines} ) {
    foreach my $iline ( @{$rqw_lines} ) {
        my $line_of_tokens = $rlines->[$iline];

        # Note that these first checks are required in case we have to scan
        # all lines, not just lines with type 'q' at the ends.
        my $line_type = $line_of_tokens->{_line_type};
        next unless ( $line_type eq 'CODE' );
        my $rK_range = $line_of_tokens->{_rK_range};
        my ( $Kfirst, $Klast ) = @{$rK_range};
        next unless ( defined($Kfirst) && defined($Klast) );   # skip blank line

        # Continuing a sequence of qw lines ...
        if ( defined($K_start_multiline_qw) ) {
            my $type = $rLL->[$Kfirst]->[_TYPE_];

            # shouldn't happen
            if ( $type ne 'q' ) {
                DEVEL_MODE && print {*STDERR} <<EOM;
STRANGE: started multiline qw at K=$K_start_multiline_qw but didn't see q qw at K=$Kfirst\n";
EOM
                $K_start_multiline_qw = undef;
                next;
            }
            my $Kprev  = $self->K_previous_nonblank($Kfirst);
            my $Knext  = $self->K_next_nonblank($Kfirst);
            my $type_m = defined($Kprev) ? $rLL->[$Kprev]->[_TYPE_] : 'b';
            my $type_p = defined($Knext) ? $rLL->[$Knext]->[_TYPE_] : 'b';
            if ( $type_m eq 'q' && $type_p ne 'q' ) {
                $rending_multiline_qw_seqno_by_K->{$Kfirst} = $qw_seqno;
                $rKrange_multiline_qw_by_seqno->{$qw_seqno} =
                  [ $K_start_multiline_qw, $Kfirst ];
                $K_start_multiline_qw = undef;
                $qw_seqno             = undef;
            }
        }

        # Starting a new a sequence of qw lines ?
        if ( !defined($K_start_multiline_qw)
            && $rLL->[$Klast]->[_TYPE_] eq 'q' )
        {
            my $Kprev  = $self->K_previous_nonblank($Klast);
            my $Knext  = $self->K_next_nonblank($Klast);
            my $type_m = defined($Kprev) ? $rLL->[$Kprev]->[_TYPE_] : 'b';
            my $type_p = defined($Knext) ? $rLL->[$Knext]->[_TYPE_] : 'b';
            if ( $type_m ne 'q' && $type_p eq 'q' ) {
                $num_qw_seqno++;
                $qw_seqno             = 'q' . $num_qw_seqno;
                $K_start_multiline_qw = $Klast;
                $rstarting_multiline_qw_seqno_by_K->{$Klast} = $qw_seqno;
            }
        }
    }

    # Give multiline qw lists extra indentation instead of CI.  This option
    # works well but is currently only activated when the -xci flag is set.
    # The reason is to avoid unexpected changes in formatting.
    if ($rOpts_extended_continuation_indentation) {
        while ( my ( $qw_seqno_x, $rKrange ) =
            each %{$rKrange_multiline_qw_by_seqno} )
        {
            my ( $Kbeg, $Kend ) = @{$rKrange};

            # require isolated closing token
            my $token_end = $rLL->[$Kend]->[_TOKEN_];
            next
              unless ( length($token_end) == 1
                && ( $is_closing_token{$token_end} || $token_end eq '>' ) );

            # require isolated opening token
            my $token_beg = $rLL->[$Kbeg]->[_TOKEN_];

            # allow space(s) after the qw
            if ( length($token_beg) > 3 && substr( $token_beg, 2, 1 ) =~ m/\s/ )
            {
                $token_beg =~ s/\s+//;
            }

            next unless ( length($token_beg) == 3 );

            foreach my $KK ( $Kbeg + 1 .. $Kend - 1 ) {
                $rLL->[$KK]->[_LEVEL_]++;
                $rLL->[$KK]->[_CI_LEVEL_] = 0;
            }

            # set flag for -wn option, which will remove the level
            $rmultiline_qw_has_extra_level->{$qw_seqno_x} = 1;
        }
    }

    # For the -lp option we need to mark all parent containers of
    # multiline quotes
    if ( $rOpts_line_up_parentheses && !$rOpts_extended_line_up_parentheses ) {

        while ( my ( $qw_seqno_x, $rKrange ) =
            each %{$rKrange_multiline_qw_by_seqno} )
        {
            my ( $Kbeg, $Kend ) = @{$rKrange};
            my $parent_seqno = $self->parent_seqno_by_K($Kend);
            next unless ($parent_seqno);

            # If the parent container exactly surrounds this qw, then -lp
            # formatting seems to work so we will not mark it.
            my $is_tightly_contained;
            my $Kn      = $self->K_next_nonblank($Kend);
            my $seqno_n = defined($Kn) ? $rLL->[$Kn]->[_TYPE_SEQUENCE_] : undef;
            if ( defined($seqno_n) && $seqno_n eq $parent_seqno ) {

                my $Kp = $self->K_previous_nonblank($Kbeg);
                my $seqno_p =
                  defined($Kp) ? $rLL->[$Kp]->[_TYPE_SEQUENCE_] : undef;
                if ( defined($seqno_p) && $seqno_p eq $parent_seqno ) {
                    $is_tightly_contained = 1;
                }
            }

            $ris_excluded_lp_container->{$parent_seqno} = 1
              unless ($is_tightly_contained);

            # continue up the tree marking parent containers
            while (1) {
                $parent_seqno = $self->[_rparent_of_seqno_]->{$parent_seqno};
                last if ( !defined($parent_seqno) );
                last if ( $parent_seqno eq SEQ_ROOT );
                $ris_excluded_lp_container->{$parent_seqno} = 1;
            }
        }
    }

    $self->[_rstarting_multiline_qw_seqno_by_K_] =
      $rstarting_multiline_qw_seqno_by_K;
    $self->[_rending_multiline_qw_seqno_by_K_] =
      $rending_multiline_qw_seqno_by_K;
    $self->[_rKrange_multiline_qw_by_seqno_] = $rKrange_multiline_qw_by_seqno;
    $self->[_rmultiline_qw_has_extra_level_] = $rmultiline_qw_has_extra_level;

    return;
} ## end sub find_multiline_qw

use constant DEBUG_COLLAPSED_LENGTHS => 0;

# Minimum space reserved for contents of a code block.  A value of 40 has given
# reasonable results.  With a large line length, say -l=120, this will not
# normally be noticeable but it will prevent making a mess in some edge cases.
use constant MIN_BLOCK_LEN => 40;

my %is_handle_type;

BEGIN {
    my @q = qw( w C U G i k => );
    @is_handle_type{@q} = (1) x scalar(@q);

    my $i = 0;
    use constant {
        _max_prong_len_         => $i++,
        _handle_len_            => $i++,
        _seqno_o_               => $i++,
        _iline_o_               => $i++,
        _K_o_                   => $i++,
        _K_c_                   => $i++,
        _interrupted_list_rule_ => $i++,
    };
} ## end BEGIN

sub is_fragile_block_type {
    my ( $self, $block_type, $seqno ) = @_;

    # Given:
    #  $block_type = the block type of a token, and
    #  $seqno      = its sequence number

    # Return:
    #  true if this block type stays broken after being broken,
    #  false otherwise

    # This sub has been added to isolate a tricky decision needed
    # to fix issue b1428.

    # The coding here needs to agree with:
    # - sub process_line where variable '$rbrace_follower' is set
    # - sub process_line_inner_loop where variable '$is_opening_BLOCK' is set,

    if (   $is_sort_map_grep_eval{$block_type}
        || $block_type eq 't'
        || $self->[_rshort_nested_]->{$seqno} )
    {
        return 0;
    }

    return 1;

} ## end sub is_fragile_block_type

{    ## closure xlp_collapsed_lengths

    my $max_prong_len;
    my $len;
    my $last_nonblank_type;
    my @stack;

    sub xlp_collapsed_lengths_initialize {

        $max_prong_len      = 0;
        $len                = 0;
        $last_nonblank_type = 'b';
        @stack              = ();

        push @stack, [
            0,           # $max_prong_len,
            0,           # $handle_len,
            SEQ_ROOT,    # $seqno,
            undef,       # $iline,
            undef,       # $KK,
            undef,       # $K_c,
            undef,       # $interrupted_list_rule
        ];

        return;
    } ## end sub xlp_collapsed_lengths_initialize

    sub cumulative_length_to_comma {
        my ( $self, $KK, $K_comma, $K_closing ) = @_;

        # Given:
        #  $KK        = index of starting token, or blank before start
        #  $K_comma   = index of line-ending comma
        #  $K_closing = index of the container closing token

        # Return:
        #  $length = cumulative length of the term

        my $rLL = $self->[_rLL_];
        if ( $rLL->[$KK]->[_TYPE_] eq 'b' ) { $KK++ }
        my $length = 0;
        if (
               $KK < $K_comma
            && $rLL->[$K_comma]->[_TYPE_] eq ','    # should be true

            # Ignore if terminal comma, causes instability (b1297,
            # b1330)
            && (
                $K_closing - $K_comma > 2
                || (   $K_closing - $K_comma == 2
                    && $rLL->[ $K_comma + 1 ]->[_TYPE_] ne 'b' )
            )

            # The comma should be in this container
            && ( $rLL->[$K_comma]->[_LEVEL_] - 1 ==
                $rLL->[$K_closing]->[_LEVEL_] )
          )
        {

            # An additional check: if line ends in ), and the ) has vtc then
            # skip this estimate. Otherwise, vtc can give oscillating results.
            # Fixes b1448. For example, this could be unstable:

            #  ( $os ne 'win' ? ( -selectcolor => "red" ) : () ),
            #  |                                               |^--K_comma
            #  |                                               ^-- K_prev
            #  ^--- KK

            # An alternative, possibly better strategy would be to try to turn
            # off -vtc locally, but it turns out to be difficult to locate the
            # appropriate closing token when it is not on the same line as its
            # opening token.

            my $K_prev = $self->K_previous_nonblank($K_comma);
            if (   defined($K_prev)
                && $K_prev >= $KK
                && $rLL->[$K_prev]->[_TYPE_SEQUENCE_] )
            {
                my $token = $rLL->[$K_prev]->[_TOKEN_];
                my $type  = $rLL->[$K_prev]->[_TYPE_];
                if ( $closing_vertical_tightness{$token} && $type ne 'R' ) {
                    ## type 'R' does not normally get broken, so ignore
                    ## skip length calculation
                    return 0;
                }
            }
            my $starting_len =
              $KK >= 0 ? $rLL->[ $KK - 1 ]->[_CUMULATIVE_LENGTH_] : 0;
            $length = $rLL->[$K_comma]->[_CUMULATIVE_LENGTH_] - $starting_len;
        }
        return $length;
    } ## end sub cumulative_length_to_comma

    sub xlp_collapsed_lengths {

        my $self = shift;

        #----------------------------------------------------------------
        # Define the collapsed lengths of containers for -xlp indentation
        #----------------------------------------------------------------

        # We need an estimate of the minimum required line length starting at
        # any opening container for the -xlp style. This is needed to avoid
        # using too much indentation space for lower level containers and
        # thereby running out of space for outer container tokens due to the
        # maximum line length limit.

        # The basic idea is that at each node in the tree we imagine that we
        # have a fork with a handle and collapsible prongs:
        #
        #                            |------------
        #                            |--------
        #                ------------|-------
        #                 handle     |------------
        #                            |--------
        #                              prongs
        #
        # Each prong has a minimum collapsed length. The collapsed length at a
        # node is the maximum of these minimum lengths, plus the handle length.
        # Each of the prongs may itself be a tree node.

        # This is just a rough calculation to get an approximate starting point
        # for indentation.  Later routines will be more precise.  It is
        # important that these estimates be independent of the line breaks of
        # the input stream in order to avoid instabilities.

        my $rLL                        = $self->[_rLL_];
        my $rlines                     = $self->[_rlines_];
        my $rcollapsed_length_by_seqno = $self->[_rcollapsed_length_by_seqno_];
        my $rtype_count_by_seqno       = $self->[_rtype_count_by_seqno_];

        my $K_start_multiline_qw;
        my $level_start_multiline_qw = 0;

        xlp_collapsed_lengths_initialize();

        #--------------------------------
        # Loop over all lines in the file
        #--------------------------------
        my $iline = -1;
        my $skip_next_line;
        foreach my $line_of_tokens ( @{$rlines} ) {
            $iline++;
            if ($skip_next_line) {
                $skip_next_line = 0;
                next;
            }
            my $line_type = $line_of_tokens->{_line_type};
            next if ( $line_type ne 'CODE' );
            my $CODE_type = $line_of_tokens->{_code_type};

            # Always skip blank lines
            next if ( $CODE_type eq 'BL' );

            # Note on other line types:
            # 'FS' (Format Skipping) lines may contain opening/closing tokens so
            #      we have to process them to keep the stack correctly sequenced
            # 'VB' (Verbatim) lines could be skipped, but testing shows that
            #      results look better if we include their lengths.

            # Also note that we could exclude -xlp formatting of containers with
            # 'FS' and 'VB' lines, but in testing that was not really beneficial

            # So we process tokens in 'FS' and 'VB' lines like all the rest...

            my $rK_range = $line_of_tokens->{_rK_range};
            my ( $K_first, $K_last ) = @{$rK_range};
            next unless ( defined($K_first) && defined($K_last) );

            my $has_comment = $rLL->[$K_last]->[_TYPE_] eq '#';

            # Always ignore block comments
            next if ( $has_comment && $K_first == $K_last );

            # Handle an intermediate line of a multiline qw quote. These may
            # require including some -ci or -i spaces.  See cases c098/x063.
            # Updated to check all lines (not just $K_first==$K_last) to fix
            # b1316
            my $K_begin_loop = $K_first;
            if ( $rLL->[$K_first]->[_TYPE_] eq 'q' ) {

                my $KK       = $K_first;
                my $level    = $rLL->[$KK]->[_LEVEL_];
                my $ci_level = $rLL->[$KK]->[_CI_LEVEL_];

                # remember the level of the start
                if ( !defined($K_start_multiline_qw) ) {
                    $K_start_multiline_qw     = $K_first;
                    $level_start_multiline_qw = $level;
                    my $seqno_qw =
                      $self->[_rstarting_multiline_qw_seqno_by_K_]
                      ->{$K_start_multiline_qw};
                    if ( !$seqno_qw ) {
                        my $Kp = $self->K_previous_nonblank($K_first);
                        if ( defined($Kp) && $rLL->[$Kp]->[_TYPE_] eq 'q' ) {

                            $K_start_multiline_qw = $Kp;
                            $level_start_multiline_qw =
                              $rLL->[$K_start_multiline_qw]->[_LEVEL_];
                        }
                        else {

                            # Fix for b1319, b1320
                            $K_start_multiline_qw = undef;
                        }
                    }
                }

                if ( defined($K_start_multiline_qw) ) {
                    $len = $rLL->[$KK]->[_CUMULATIVE_LENGTH_] -
                      $rLL->[ $KK - 1 ]->[_CUMULATIVE_LENGTH_];

                    # We may have to add the spaces of one level or ci level
                    # ...  it depends depends on the -xci flag, the -wn flag,
                    # and if the qw uses a container token as the quote
                    # delimiter.

                    # First rule: add ci if there is a $ci_level
                    if ($ci_level) {
                        $len += $rOpts_continuation_indentation;
                    }

                    # Second rule: otherwise, look for an extra indentation
                    # level from the start and add one indentation level if
                    # found.
                    else {
                        if ( $level > $level_start_multiline_qw ) {
                            $len += $rOpts_indent_columns;
                        }
                    }

                    if ( $len > $max_prong_len ) { $max_prong_len = $len }

                    $last_nonblank_type = 'q';

                    $K_begin_loop = $K_first + 1;

                    # We can skip to the next line if more tokens
                    next if ( $K_begin_loop > $K_last );
                }
            }

            $K_start_multiline_qw = undef;

            # Find the terminal token, before any side comment
            my $K_terminal = $K_last;
            if ($has_comment) {
                $K_terminal -= 1;
                $K_terminal -= 1
                  if ( $rLL->[$K_terminal]->[_TYPE_] eq 'b'
                    && $K_terminal > $K_first );
            }

            # Use length to terminal comma if interrupted list rule applies
            if ( @stack && $stack[-1]->[_interrupted_list_rule_] ) {
                my $K_c = $stack[-1]->[_K_c_];
                if ( defined($K_c) ) {

                    #----------------------------------------------------------
                    # BEGIN patch for issue b1408: If this line ends in an
                    # opening token, look for the closing token and comma at
                    # the end of the next line. If so, combine the two lines to
                    # get the correct sums.  This problem seems to require -xlp
                    # -vtc=2 and blank lines to occur. Use %is_opening_type to
                    # fix b1431.
                    #----------------------------------------------------------
                    if ( $is_opening_type{ $rLL->[$K_terminal]->[_TYPE_] }
                        && !$has_comment )
                    {
                        my $seqno_end = $rLL->[$K_terminal]->[_TYPE_SEQUENCE_];
                        my $Kc_test   = $rLL->[$K_terminal]->[_KNEXT_SEQ_ITEM_];

                        # We are looking for a short broken remnant on the next
                        # line; something like the third line here (b1408):

                    #     parent =>
                    #       Moose::Util::TypeConstraints::find_type_constraint(
                    #               'RefXX' ),
                    # or this
                    #
                    #  Help::WorkSubmitter->_filter_chores_and_maybe_warn_user(
                    #                                    $story_set_all_chores),
                    # or this (b1431):
                    #        $issue->{
                    #           'borrowernumber'},  # borrowernumber
                        if (   defined($Kc_test)
                            && $seqno_end == $rLL->[$Kc_test]->[_TYPE_SEQUENCE_]
                            && $rLL->[$Kc_test]->[_LINE_INDEX_] == $iline + 1 )
                        {
                            my $line_of_tokens_next = $rlines->[ $iline + 1 ];
                            my $rtype_count =
                              $rtype_count_by_seqno->{$seqno_end};
                            my ( $K_first_next, $K_terminal_next ) =
                              @{ $line_of_tokens_next->{_rK_range} };

                            # backup at a side comment
                            if ( defined($K_terminal_next)
                                && $rLL->[$K_terminal_next]->[_TYPE_] eq '#' )
                            {
                                my $Kprev =
                                  $self->K_previous_nonblank($K_terminal_next);
                                if ( defined($Kprev)
                                    && $Kprev >= $K_first_next )
                                {
                                    $K_terminal_next = $Kprev;
                                }
                            }

                            if (
                                defined($K_terminal_next)

                                # next line ends with a comma
                                && $rLL->[$K_terminal_next]->[_TYPE_] eq ','

                                # which follows the closing container token
                                && (
                                    $K_terminal_next - $Kc_test == 1
                                    || (   $K_terminal_next - $Kc_test == 2
                                        && $rLL->[ $K_terminal_next - 1 ]
                                        ->[_TYPE_] eq 'b' )
                                )

                                # no commas in the container
                                && (   !defined($rtype_count)
                                    || !$rtype_count->{','} )

                                # for now, restrict this to a container with
                                # just 1 or two tokens
                                && $K_terminal_next - $K_terminal <= 5

                              )
                            {

                                # combine the next line with the current line
                                $K_terminal     = $K_terminal_next;
                                $skip_next_line = 1;
                                if (DEBUG_COLLAPSED_LENGTHS) {
                                    print "Combining lines at line $iline\n";
                                }
                            }
                        }
                    }

                    #--------------------------
                    # END patch for issue b1408
                    #--------------------------
                    if ( $rLL->[$K_terminal]->[_TYPE_] eq ',' ) {

                        my $length =
                          $self->cumulative_length_to_comma( $K_first,
                            $K_terminal, $K_c );

                        # Fix for b1331: at a broken => item, include the
                        # length of the previous half of the item plus one for
                        # the missing space
                        if ( $last_nonblank_type eq '=>' ) {
                            $length += $len + 1;
                        }
                        if ( $length > $max_prong_len ) {
                            $max_prong_len = $length;
                        }
                    }
                }
            }

            #----------------------------------
            # Loop over all tokens on this line
            #----------------------------------
            $self->xlp_collapse_lengths_inner_loop( $iline, $K_begin_loop,
                $K_terminal, $K_last );

            # Now take care of any side comment;
            if ($has_comment) {
                if ($rOpts_ignore_side_comment_lengths) {
                    $len = 0;
                }
                else {

                 # For a side comment when -iscl is not set, measure length from
                 # the start of the previous nonblank token
                    my $len0 =
                        $K_terminal > 0
                      ? $rLL->[ $K_terminal - 1 ]->[_CUMULATIVE_LENGTH_]
                      : 0;
                    $len = $rLL->[$K_last]->[_CUMULATIVE_LENGTH_] - $len0;
                    if ( $len > $max_prong_len ) { $max_prong_len = $len }
                }
            }

        } ## end loop over lines

        if (DEBUG_COLLAPSED_LENGTHS) {
            print "\nCollapsed lengths--\n";
            foreach
              my $key ( sort { $a <=> $b } keys %{$rcollapsed_length_by_seqno} )
            {
                my $clen = $rcollapsed_length_by_seqno->{$key};
                print "$key -> $clen\n";
            }
        }

        return;
    } ## end sub xlp_collapsed_lengths

    sub xlp_collapse_lengths_inner_loop {

        my ( $self, $iline, $K_begin_loop, $K_terminal, $K_last ) = @_;

        my $rLL                 = $self->[_rLL_];
        my $K_closing_container = $self->[_K_closing_container_];

        my $rblock_type_of_seqno       = $self->[_rblock_type_of_seqno_];
        my $rcollapsed_length_by_seqno = $self->[_rcollapsed_length_by_seqno_];
        my $ris_permanently_broken     = $self->[_ris_permanently_broken_];
        my $ris_list_by_seqno          = $self->[_ris_list_by_seqno_];
        my $rhas_broken_list           = $self->[_rhas_broken_list_];
        my $rtype_count_by_seqno       = $self->[_rtype_count_by_seqno_];

        #----------------------------------
        # Loop over tokens on this line ...
        #----------------------------------
        foreach my $KK ( $K_begin_loop .. $K_terminal ) {

            my $type = $rLL->[$KK]->[_TYPE_];
            next if ( $type eq 'b' );

            #------------------------
            # Handle sequenced tokens
            #------------------------
            my $seqno = $rLL->[$KK]->[_TYPE_SEQUENCE_];
            if ($seqno) {

                my $token = $rLL->[$KK]->[_TOKEN_];

                #----------------------------
                # Entering a new container...
                #----------------------------
                if ( $is_opening_token{$token}
                    && defined( $K_closing_container->{$seqno} ) )
                {

                    # save current prong length
                    $stack[-1]->[_max_prong_len_] = $max_prong_len;
                    $max_prong_len = 0;

                    # Start new prong one level deeper
                    my $handle_len = 0;
                    if ( $rblock_type_of_seqno->{$seqno} ) {

                        # code blocks do not use -lp indentation, but behave as
                        # if they had a handle of one indentation length
                        $handle_len = $rOpts_indent_columns;

                    }
                    else {
                        if ( $is_handle_type{$last_nonblank_type} ) {
                            $handle_len = $len;
                            $handle_len += 1
                              if ( $KK > 0
                                && $rLL->[ $KK - 1 ]->[_TYPE_] eq 'b' );
                        }
                    }

                    # Set a flag if the 'Interrupted List Rule' will be applied
                    # (see sub copy_old_breakpoints).
                    # - Added check on has_broken_list to fix issue b1298

                    my $interrupted_list_rule =
                         $ris_permanently_broken->{$seqno}
                      && $ris_list_by_seqno->{$seqno}
                      && !$rhas_broken_list->{$seqno}
                      && !$rOpts_ignore_old_breakpoints;

                    # NOTES: Since we are looking at old line numbers we have
                    # to be very careful not to introduce an instability.

                    # This following causes instability (b1288-b1296):
                    #   $interrupted_list_rule ||=
                    #     $rOpts_break_at_old_comma_breakpoints;

                    #  - We could turn off the interrupted list rule if there is
                    #    a broken sublist, to follow 'Compound List Rule 1'.
                    #  - We could use the _rhas_broken_list_ flag for this.
                    #  - But it seems safer not to do this, to avoid
                    #    instability, since the broken sublist could be
                    #    temporary.  It seems better to let the formatting
                    #    stabilize by itself after one or two iterations.
                    #  - So, not doing this for now

                    # Turn off the interrupted list rule if -vmll is set and a
                    # list has '=>' characters.  This avoids instabilities due
                    # to dependence on old line breaks; issue b1325.
                    if (   $interrupted_list_rule
                        && $rOpts_variable_maximum_line_length )
                    {
                        my $rtype_count = $rtype_count_by_seqno->{$seqno};
                        if ( $rtype_count && $rtype_count->{'=>'} ) {
                            $interrupted_list_rule = 0;
                        }
                    }

                    my $K_c = $K_closing_container->{$seqno};

                    # Add length of any terminal list item if interrupted
                    # so that the result is the same as if the term is
                    # in the next line (b1446).

                    if (
                           $interrupted_list_rule
                        && $KK < $K_terminal

                        # The line should end in a comma
                        # NOTE: this currently assumes break after comma.
                        # As long as the other call to cumulative_length..
                        # makes the same assumption we should remain stable.
                        && $rLL->[$K_terminal]->[_TYPE_] eq ','

                      )
                    {
                        $max_prong_len =
                          $self->cumulative_length_to_comma( $KK + 1,
                            $K_terminal, $K_c );
                    }

                    push @stack, [

                        $max_prong_len,
                        $handle_len,
                        $seqno,
                        $iline,
                        $KK,
                        $K_c,
                        $interrupted_list_rule
                    ];

                }

                #--------------------
                # Exiting a container
                #--------------------
                elsif ( $is_closing_token{$token} && @stack ) {

                    # The current prong ends - get its handle
                    my $item          = pop @stack;
                    my $handle_len    = $item->[_handle_len_];
                    my $seqno_o       = $item->[_seqno_o_];
                    my $iline_o       = $item->[_iline_o_];
                    my $K_o           = $item->[_K_o_];
                    my $K_c_expect    = $item->[_K_c_];
                    my $collapsed_len = $max_prong_len;

                    if ( $seqno_o ne $seqno ) {

                        # This can happen if input file has brace errors.
                        # Otherwise it shouldn't happen.  Not fatal but -lp
                        # formatting could get messed up.
                        if ( DEVEL_MODE && !get_saw_brace_error() ) {
                            Fault(<<EOM);
sequence numbers differ; at CLOSING line $iline, seq=$seqno, Kc=$KK .. at OPENING line $iline_o, seq=$seqno_o, Ko=$K_o, expecting Kc=$K_c_expect
EOM
                        }
                    }

                    #------------------------------------------
                    # Rules to avoid scrunching code blocks ...
                    #------------------------------------------
                    # Some test cases:
                    # c098/x107 x108 x110 x112 x114 x115 x117 x118 x119
                    my $block_type = $rblock_type_of_seqno->{$seqno};
                    if ($block_type) {

                        my $K_c          = $KK;
                        my $block_length = MIN_BLOCK_LEN;
                        my $is_one_line_block;
                        my $level = $rLL->[$K_o]->[_LEVEL_];
                        if ( defined($K_o) && defined($K_c) ) {

                            # note: fixed 3 May 2022 (removed 'my')
                            $block_length =
                              $rLL->[ $K_c - 1 ]->[_CUMULATIVE_LENGTH_] -
                              $rLL->[$K_o]->[_CUMULATIVE_LENGTH_];
                            $is_one_line_block = $iline == $iline_o;
                        }

                        # Code block rule 1: Use the total block length if
                        # it is less than the minimum.
                        if ( $block_length < MIN_BLOCK_LEN ) {
                            $collapsed_len = $block_length;
                        }

                        # Code block rule 2: Use the full length of a
                        # one-line block to avoid breaking it, unless
                        # extremely long.  We do not need to do a precise
                        # check here, because if it breaks then it will
                        # stay broken on later iterations.
                        elsif (
                               $is_one_line_block
                            && $block_length <
                            $maximum_line_length_at_level[$level]

                            # But skip this for blocks types which can reform,
                            # like sort/map/grep/eval blocks, to avoid
                            # instability (b1345, b1428)
                            && $self->is_fragile_block_type( $block_type,
                                $seqno )
                          )
                        {
                            $collapsed_len = $block_length;
                        }

                        # Code block rule 3: Otherwise the length should be
                        # at least MIN_BLOCK_LEN to avoid scrunching code
                        # blocks.
                        elsif ( $collapsed_len < MIN_BLOCK_LEN ) {
                            $collapsed_len = MIN_BLOCK_LEN;
                        }
                        else {
                            ## ok
                        }
                    }

                    # Store the result.  Some extra space, '2', allows for
                    # length of an opening token, inside space, comma, ...
                    # This constant has been tuned to give good overall
                    # results.
                    $collapsed_len += 2;
                    $rcollapsed_length_by_seqno->{$seqno} = $collapsed_len;

                    # Restart scanning the lower level prong
                    if (@stack) {
                        $max_prong_len = $stack[-1]->[_max_prong_len_];
                        $collapsed_len += $handle_len;
                        if ( $collapsed_len > $max_prong_len ) {
                            $max_prong_len = $collapsed_len;
                        }
                    }
                }

                # it is a ternary - no special processing for these yet
                else {

                }

                $len                = 0;
                $last_nonblank_type = $type;
                next;
            }

            #----------------------------
            # Handle non-container tokens
            #----------------------------
            my $token_length = $rLL->[$KK]->[_TOKEN_LENGTH_];

            # Count lengths of things like 'xx => yy' as a single item
            if ( $type eq '=>' ) {
                $len += $token_length + 1;

                # fix $len for -naws, issue b1457
                if ( !$rOpts_add_whitespace ) {
                    if ( defined( $rLL->[ $KK + 1 ] )
                        && $rLL->[ $KK + 1 ]->[_TYPE_] ne 'b' )
                    {
                        $len -= 1;
                    }
                }

                if ( $len > $max_prong_len ) { $max_prong_len = $len }
            }
            elsif ( $last_nonblank_type eq '=>' ) {
                $len += $token_length;
                if ( $len > $max_prong_len ) { $max_prong_len = $len }

                # but only include one => per item
                $len = $token_length;
            }

            # include everything to end of line after a here target
            elsif ( $type eq 'h' ) {
                $len = $rLL->[$K_last]->[_CUMULATIVE_LENGTH_] -
                  $rLL->[ $KK - 1 ]->[_CUMULATIVE_LENGTH_];
                if ( $len > $max_prong_len ) { $max_prong_len = $len }
            }

            # for everything else just use the token length
            else {
                $len = $token_length;
                if ( $len > $max_prong_len ) { $max_prong_len = $len }
            }
            $last_nonblank_type = $type;

        } ## end loop over tokens on this line

        return;

    } ## end sub xlp_collapse_lengths_inner_loop

} ## end closure xlp_collapsed_lengths

sub is_excluded_lp {

    # Decide if this container is excluded by user request:
    #  returns true if this token is excluded (i.e., may not use -lp)
    #  returns false otherwise

    # The control hash can either describe:
    #   what to exclude:  $line_up_parentheses_control_is_lxpl = 1, or
    #   what to include:  $line_up_parentheses_control_is_lxpl = 0

    # Input parameter:
    #   $KK = index of the container opening token

    my ( $self, $KK ) = @_;
    my $rLL         = $self->[_rLL_];
    my $rtoken_vars = $rLL->[$KK];
    my $token       = $rtoken_vars->[_TOKEN_];
    my $rflags      = $line_up_parentheses_control_hash{$token};

    #-----------------------------------------------
    # TEST #1: check match to listed container types
    #-----------------------------------------------
    if ( !defined($rflags) ) {

        # There is no entry for this container, so we are done
        return !$line_up_parentheses_control_is_lxpl;
    }

    my ( $flag1, $flag2 ) = @{$rflags};

    #-----------------------------------------------------------
    # TEST #2: check match to flag1, the preceding nonblank word
    #-----------------------------------------------------------
    my $match_flag1 = !defined($flag1) || $flag1 eq '*';
    if ( !$match_flag1 ) {

        # Find the previous token
        my ( $is_f, $is_k, $is_w );
        my $Kp = $self->K_previous_nonblank($KK);
        if ( defined($Kp) ) {
            my $type_p = $rLL->[$Kp]->[_TYPE_];
            my $seqno  = $rtoken_vars->[_TYPE_SEQUENCE_];

            # keyword?
            $is_k = $type_p eq 'k';

            # function call?
            $is_f = $self->[_ris_function_call_paren_]->{$seqno};

            # either keyword or function call?
            $is_w = $is_k || $is_f;
        }

        # Check for match based on flag1 and the previous token:
        if    ( $flag1 eq 'k' ) { $match_flag1 = $is_k }
        elsif ( $flag1 eq 'K' ) { $match_flag1 = !$is_k }
        elsif ( $flag1 eq 'f' ) { $match_flag1 = $is_f }
        elsif ( $flag1 eq 'F' ) { $match_flag1 = !$is_f }
        elsif ( $flag1 eq 'w' ) { $match_flag1 = $is_w }
        elsif ( $flag1 eq 'W' ) { $match_flag1 = !$is_w }
        else {
            ## no match
        }
    }

    # See if we can exclude this based on the flag1 test...
    if ($line_up_parentheses_control_is_lxpl) {
        return 1 if ($match_flag1);
    }
    else {
        return 1 if ( !$match_flag1 );
    }

    #-------------------------------------------------------------
    # TEST #3: exclusion based on flag2 and the container contents
    #-------------------------------------------------------------

    # Note that this is an exclusion test for both -lpxl or -lpil input methods
    # The options are:
    #  0 or blank: ignore container contents
    #  1 exclude non-lists or lists with sublists
    #  2 same as 1 but also exclude lists with code blocks

    my $match_flag2;
    if ($flag2) {

        my $seqno = $rtoken_vars->[_TYPE_SEQUENCE_];

        my $is_list        = $self->[_ris_list_by_seqno_]->{$seqno};
        my $has_list       = $self->[_rhas_list_]->{$seqno};
        my $has_code_block = $self->[_rhas_code_block_]->{$seqno};
        my $has_ternary    = $self->[_rhas_ternary_]->{$seqno};

        if (  !$is_list
            || $has_list
            || $flag2 eq '2' && ( $has_code_block || $has_ternary ) )
        {
            $match_flag2 = 1;
        }
    }
    return $match_flag2;
} ## end sub is_excluded_lp

sub set_excluded_lp_containers {

    my ($self) = @_;
    return unless ($rOpts_line_up_parentheses);
    my $rLL = $self->[_rLL_];
    return unless ( defined($rLL) && @{$rLL} );

    my $K_opening_container       = $self->[_K_opening_container_];
    my $ris_excluded_lp_container = $self->[_ris_excluded_lp_container_];
    my $rblock_type_of_seqno      = $self->[_rblock_type_of_seqno_];

    foreach my $seqno ( keys %{$K_opening_container} ) {

        # code blocks are always excluded by the -lp coding so we can skip them
        next if ( $rblock_type_of_seqno->{$seqno} );

        my $KK = $K_opening_container->{$seqno};
        next unless defined($KK);

        # see if a user exclusion rule turns off -lp for this container
        if ( $self->is_excluded_lp($KK) ) {
            $ris_excluded_lp_container->{$seqno} = 1;
        }
    }
    return;
} ## end sub set_excluded_lp_containers

######################################
# CODE SECTION 6: Process line-by-line
######################################

sub process_all_lines {

    #----------------------------------------------------------
    # Main loop to format all lines of a file according to type
    #----------------------------------------------------------

    my $self                       = shift;
    my $rlines                     = $self->[_rlines_];
    my $rOpts_keep_old_blank_lines = $rOpts->{'keep-old-blank-lines'};
    my $file_writer_object         = $self->[_file_writer_object_];
    my $logger_object              = $self->[_logger_object_];
    my $vertical_aligner_object    = $self->[_vertical_aligner_object_];
    my $save_logfile               = $self->[_save_logfile_];

    # Flag to prevent blank lines when POD occurs in a format skipping sect.
    my $in_format_skipping_section;

    # set locations for blanks around long runs of keywords
    my $rwant_blank_line_after = $self->keyword_group_scan();

    my $line_type      = EMPTY_STRING;
    my $i_last_POD_END = -10;
    my $i              = -1;
    foreach my $line_of_tokens ( @{$rlines} ) {

        # insert blank lines requested for keyword sequences
        if ( defined( $rwant_blank_line_after->{$i} )
            && $rwant_blank_line_after->{$i} == 1 )
        {
            $self->want_blank_line();
        }

        $i++;

        my $last_line_type = $line_type;
        $line_type = $line_of_tokens->{_line_type};
        my $input_line = $line_of_tokens->{_line_text};

        # _line_type codes are:
        #   SYSTEM         - system-specific code before hash-bang line
        #   CODE           - line of perl code (including comments)
        #   POD_START      - line starting pod, such as '=head'
        #   POD            - pod documentation text
        #   POD_END        - last line of pod section, '=cut'
        #   HERE           - text of here-document
        #   HERE_END       - last line of here-doc (target word)
        #   FORMAT         - format section
        #   FORMAT_END     - last line of format section, '.'
        #   SKIP           - code skipping section
        #   SKIP_END       - last line of code skipping section, '#>>V'
        #   DATA_START     - __DATA__ line
        #   DATA           - unidentified text following __DATA__
        #   END_START      - __END__ line
        #   END            - unidentified text following __END__
        #   ERROR          - we are in big trouble, probably not a perl script

        # put a blank line after an =cut which comes before __END__ and __DATA__
        # (required by podchecker)
        if ( $last_line_type eq 'POD_END' && !$self->[_saw_END_or_DATA_] ) {
            $i_last_POD_END = $i;
            $file_writer_object->reset_consecutive_blank_lines();
            if ( !$in_format_skipping_section && $input_line !~ /^\s*$/ ) {
                $self->want_blank_line();
            }
        }

        # handle line of code..
        if ( $line_type eq 'CODE' ) {

            my $CODE_type = $line_of_tokens->{_code_type};
            $in_format_skipping_section = $CODE_type eq 'FS';

            # Handle blank lines
            if ( $CODE_type eq 'BL' ) {

                # Keep this blank? Start with the flag -kbl=n, where
                #   n=0 ignore all old blank lines
                #   n=1 stable: keep old blanks, but limited by -mbl=n
                #   n=2 keep all old blank lines, regardless of -mbl=n
                # If n=0 we delete all old blank lines and let blank line
                # rules generate any needed blank lines.
                my $kgb_keep = $rOpts_keep_old_blank_lines;

                # Then delete lines requested by the keyword-group logic if
                # allowed
                if (   $kgb_keep == 1
                    && defined( $rwant_blank_line_after->{$i} )
                    && $rwant_blank_line_after->{$i} == 2 )
                {
                    $kgb_keep = 0;
                }

                # But always keep a blank line following an =cut
                if ( $i - $i_last_POD_END < 3 && !$kgb_keep ) {
                    $kgb_keep = 1;
                }

                if ($kgb_keep) {
                    $self->flush($CODE_type);
                    $file_writer_object->write_blank_code_line(
                        $rOpts_keep_old_blank_lines == 2 );
                    $self->[_last_line_leading_type_] = 'b';
                }
                next;
            }
            else {

                # Let logger see all non-blank lines of code. This is a slow
                # operation so we avoid it if it is not going to be saved.
                if ( $save_logfile && $logger_object ) {
                    $logger_object->black_box( $line_of_tokens,
                        $vertical_aligner_object->get_output_line_number );
                }
            }

            # Handle Format Skipping (FS) and Verbatim (VB) Lines
            if ( $CODE_type eq 'VB' || $CODE_type eq 'FS' ) {
                $self->write_unindented_line($input_line);
                $file_writer_object->reset_consecutive_blank_lines();
                next;
            }

            # Handle all other lines of code
            $self->process_line_of_CODE($line_of_tokens);
        }

        # handle line of non-code..
        else {

            # set special flags
            my $skip_line = 0;
            if ( substr( $line_type, 0, 3 ) eq 'POD' ) {

                # Pod docs should have a preceding blank line.  But stay
                # out of __END__ and __DATA__ sections, because
                # the user may be using this section for any purpose whatsoever
                if ( $rOpts->{'delete-pod'} ) { $skip_line = 1; }
                if ( $rOpts->{'trim-pod'} ) {
                    chomp $input_line;
                    $input_line =~ s/\s+$//;
                    $input_line .= "\n";
                }
                if (   !$skip_line
                    && !$in_format_skipping_section
                    && $line_type eq 'POD_START'
                    && !$self->[_saw_END_or_DATA_] )
                {
                    $self->want_blank_line();
                }
            }

            # leave the blank counters in a predictable state
            # after __END__ or __DATA__
            elsif ( $line_type eq 'END_START' || $line_type eq 'DATA_START' ) {
                $file_writer_object->reset_consecutive_blank_lines();
                $self->[_saw_END_or_DATA_] = 1;
            }

            # Patch to avoid losing blank lines after a code-skipping block;
            # fixes case c047.
            elsif ( $line_type eq 'SKIP_END' ) {
                $file_writer_object->reset_consecutive_blank_lines();
            }
            else {
                ## some other line type
            }

            # write unindented non-code line
            if ( !$skip_line ) {
                $self->write_unindented_line($input_line);
            }
        }
    }
    return;

} ## end sub process_all_lines

{    ## closure keyword_group_scan

    # this is the return var
    my $rhash_of_desires;

    # user option variables for -kgb
    my (

        $rOpts_kgb_after,
        $rOpts_kgb_before,
        $rOpts_kgb_delete,
        $rOpts_kgb_inside,
        $rOpts_kgb_size_max,
        $rOpts_kgb_size_min,

    );

    # group variables, initialized by kgb_initialize_group_vars
    my ( $ibeg, $iend, $count, $level_beg, $K_closing );
    my ( @iblanks, @group, @subgroup );

    # line variables, updated by sub keyword_group_scan
    my ( $line_type, $CODE_type, $K_first, $K_last );
    my $number_of_groups_seen;

    #------------------------
    # -kgb helper subroutines
    #------------------------

    sub kgb_initialize_options {

        # check and initialize user options for -kgb
        # return error flag:
        #  true for some input error, do not continue
        #  false if ok

        # Local copies of the various control parameters
        $rOpts_kgb_after  = $rOpts->{'keyword-group-blanks-after'};    # '-kgba'
        $rOpts_kgb_before = $rOpts->{'keyword-group-blanks-before'};   # '-kgbb'
        $rOpts_kgb_delete = $rOpts->{'keyword-group-blanks-delete'};   # '-kgbd'
        $rOpts_kgb_inside = $rOpts->{'keyword-group-blanks-inside'};   # '-kgbi'

        # A range of sizes can be input with decimal notation like 'min.max'
        # with any number of dots between the two numbers. Examples:
        #    string    =>    min    max  matches
        #    1.1             1      1    exactly 1
        #    1.3             1      3    1,2, or 3
        #    1..3            1      3    1,2, or 3
        #    5               5      -    5 or more
        #    6.              6      -    6 or more
        #    .2              -      2    up to 2
        #    1.0             1      0    nothing
        my $rOpts_kgb_size = $rOpts->{'keyword-group-blanks-size'};    # '-kgbs'
        ( $rOpts_kgb_size_min, $rOpts_kgb_size_max ) = split /\.+/,
          $rOpts_kgb_size;
        if (   $rOpts_kgb_size_min && $rOpts_kgb_size_min !~ /^\d+$/
            || $rOpts_kgb_size_max && $rOpts_kgb_size_max !~ /^\d+$/ )
        {
            Warn(<<EOM);
Unexpected value for -kgbs: '$rOpts_kgb_size'; expecting 'min' or 'min.max';
ignoring all -kgb flags
EOM

            # Turn this option off so that this message does not keep repeating
            # during iterations and other files.
            $rOpts->{'keyword-group-blanks-size'} = EMPTY_STRING;
            return $rhash_of_desires;
        }
        $rOpts_kgb_size_min = 1 unless ($rOpts_kgb_size_min);

        if ( $rOpts_kgb_size_max && $rOpts_kgb_size_max < $rOpts_kgb_size_min )
        {
            return $rhash_of_desires;
        }

        # check codes for $rOpts_kgb_before and
        # $rOpts_kgb_after:
        #   0 = never (delete if exist)
        #   1 = stable (keep unchanged)
        #   2 = always (insert if missing)
        my $ok = $rOpts_kgb_size_min > 0
          && ( $rOpts_kgb_before != 1
            || $rOpts_kgb_after != 1
            || $rOpts_kgb_inside
            || $rOpts_kgb_delete );

        return $rhash_of_desires if ( !$ok );

        return;
    } ## end sub kgb_initialize_options

    sub kgb_initialize_group_vars {

        # Definitions:
        #      $ibeg = first line index of this entire group
        #      $iend =  last line index of this entire group
        #     $count = total number of keywords seen in this entire group
        # $level_beg = indentation level of this group
        #     @group = [ $i, $token, $count ] =list of all keywords & blanks
        #  @subgroup =  $j, index of group where token changes
        #   @iblanks = line indexes of blank lines in input stream in this group
        #  where i=starting line index
        #        token (the keyword)
        #        count = number of this token in this subgroup
        #            j = index in group where token changes
        $ibeg      = -1;
        $iend      = undef;
        $level_beg = -1;
        $K_closing = undef;
        $count     = 0;
        @group     = ();
        @subgroup  = ();
        @iblanks   = ();
        return;
    } ## end sub kgb_initialize_group_vars

    sub kgb_initialize_line_vars {
        $CODE_type = EMPTY_STRING;
        $K_first   = undef;
        $K_last    = undef;
        $line_type = EMPTY_STRING;
        return;
    } ## end sub kgb_initialize_line_vars

    sub kgb_initialize {

        # initialize all closure variables for -kgb
        # return:
        #   true to cause immediate exit (something is wrong)
        #   false to continue ... all is okay

        # This is the return variable:
        $rhash_of_desires = {};

        # initialize and check user options;
        my $quit = kgb_initialize_options();
        if ($quit) { return $quit }

        # initialize variables for the current group and subgroups:
        kgb_initialize_group_vars();

        # initialize variables for the most recently seen line:
        kgb_initialize_line_vars();

        $number_of_groups_seen = 0;

        # all okay
        return;
    } ## end sub kgb_initialize

    sub kgb_insert_blank_after {
        my ($i) = @_;
        $rhash_of_desires->{$i} = 1;
        my $ip = $i + 1;
        if ( defined( $rhash_of_desires->{$ip} )
            && $rhash_of_desires->{$ip} == 2 )
        {
            $rhash_of_desires->{$ip} = 0;
        }
        return;
    } ## end sub kgb_insert_blank_after

    sub kgb_split_into_sub_groups {

        # place blanks around long sub-groups of keywords
        # ...if requested
        return unless ($rOpts_kgb_inside);

        # loop over sub-groups, index k
        push @subgroup, scalar @group;
        my $kbeg = 1;
        my $kend = @subgroup - 1;
        foreach my $k ( $kbeg .. $kend ) {

            # index j runs through all keywords found
            my $j_b = $subgroup[ $k - 1 ];
            my $j_e = $subgroup[$k] - 1;

            # index i is the actual line number of a keyword
            my ( $i_b, $tok_b, $count_b ) = @{ $group[$j_b] };
            my ( $i_e, $tok_e, $count_e ) = @{ $group[$j_e] };
            my $num = $count_e - $count_b + 1;

            # This subgroup runs from line $ib to line $ie-1, but may contain
            # blank lines
            if ( $num >= $rOpts_kgb_size_min ) {

                # if there are blank lines, we require that at least $num lines
                # be non-blank up to the boundary with the next subgroup.
                my $nog_b = my $nog_e = 1;
                if ( @iblanks && !$rOpts_kgb_delete ) {
                    my $j_bb = $j_b + $num - 1;
                    my ( $i_bb, $tok_bb, $count_bb ) = @{ $group[$j_bb] };
                    $nog_b = $count_bb - $count_b + 1 == $num;

                    my $j_ee = $j_e - ( $num - 1 );
                    my ( $i_ee, $tok_ee, $count_ee ) = @{ $group[$j_ee] };
                    $nog_e = $count_e - $count_ee + 1 == $num;
                }
                if ( $nog_b && $k > $kbeg ) {
                    kgb_insert_blank_after( $i_b - 1 );
                }
                if ( $nog_e && $k < $kend ) {
                    my ( $i_ep, $tok_ep, $count_ep ) =
                      @{ $group[ $j_e + 1 ] };
                    kgb_insert_blank_after( $i_ep - 1 );
                }
            }
        }
        return;
    } ## end sub kgb_split_into_sub_groups

    sub kgb_delete_if_blank {
        my ( $self, $i ) = @_;

        # delete line $i if it is blank
        my $rlines = $self->[_rlines_];
        return if ( $i < 0 || $i >= @{$rlines} );
        return if ( $rlines->[$i]->{_line_type} ne 'CODE' );
        my $code_type = $rlines->[$i]->{_code_type};
        if ( $code_type eq 'BL' ) { $rhash_of_desires->{$i} = 2; }
        return;
    } ## end sub kgb_delete_if_blank

    sub kgb_delete_inner_blank_lines {

        # always remove unwanted trailing blank lines from our list
        return unless (@iblanks);
        while ( my $ibl = pop(@iblanks) ) {
            if ( $ibl < $iend ) { push @iblanks, $ibl; last }
            $iend = $ibl;
        }

        # now mark mark interior blank lines for deletion if requested
        return unless ($rOpts_kgb_delete);

        while ( my $ibl = pop(@iblanks) ) { $rhash_of_desires->{$ibl} = 2 }

        return;
    } ## end sub kgb_delete_inner_blank_lines

    sub kgb_end_group {

        # end a group of keywords
        my ( $self, $bad_ending ) = @_;
        if ( defined($ibeg) && $ibeg >= 0 ) {

            # then handle sufficiently large groups
            if ( $count >= $rOpts_kgb_size_min ) {

                $number_of_groups_seen++;

                # do any blank deletions regardless of the count
                kgb_delete_inner_blank_lines();

                my $rlines = $self->[_rlines_];
                if ( $ibeg > 0 ) {
                    my $code_type = $rlines->[ $ibeg - 1 ]->{_code_type};

                    # patch for hash bang line which is not currently marked as
                    # a comment; mark it as a comment
                    if ( $ibeg == 1 && !$code_type ) {
                        my $line_text = $rlines->[ $ibeg - 1 ]->{_line_text};
                        $code_type = 'BC'
                          if ( $line_text && $line_text =~ /^#/ );
                    }

                    # Do not insert a blank after a comment
                    # (this could be subject to a flag in the future)
                    if ( $code_type !~ /(?:BC|SBC|SBCX)/ ) {
                        if ( $rOpts_kgb_before == INSERT ) {
                            kgb_insert_blank_after( $ibeg - 1 );

                        }
                        elsif ( $rOpts_kgb_before == DELETE ) {
                            $self->kgb_delete_if_blank( $ibeg - 1 );
                        }
                        else {
                            ## == STABLE
                        }
                    }
                }

                # We will only put blanks before code lines. We could loosen
                # this rule a little, but we have to be very careful because
                # for example we certainly don't want to drop a blank line
                # after a line like this:
                #   my $var = <<EOM;
                if ( $line_type eq 'CODE' && defined($K_first) ) {

                    # - Do not put a blank before a line of different level
                    # - Do not put a blank line if we ended the search badly
                    # - Do not put a blank at the end of the file
                    # - Do not put a blank line before a hanging side comment
                    my $rLL      = $self->[_rLL_];
                    my $level    = $rLL->[$K_first]->[_LEVEL_];
                    my $ci_level = $rLL->[$K_first]->[_CI_LEVEL_];

                    if (   $level == $level_beg
                        && $ci_level == 0
                        && !$bad_ending
                        && $iend < @{$rlines}
                        && $CODE_type ne 'HSC' )
                    {
                        if ( $rOpts_kgb_after == INSERT ) {
                            kgb_insert_blank_after($iend);
                        }
                        elsif ( $rOpts_kgb_after == DELETE ) {
                            $self->kgb_delete_if_blank( $iend + 1 );
                        }
                        else {
                            ## == STABLE
                        }
                    }
                }
            }
            kgb_split_into_sub_groups();
        }

        # reset for another group
        kgb_initialize_group_vars();

        return;
    } ## end sub kgb_end_group

    sub kgb_find_container_end {

        # If the keyword line is continued onto subsequent lines, find the
        # closing token '$K_closing' so that we can easily skip past the
        # contents of the container.

        # We only set this value if we find a simple list, meaning
        # -contents only one level deep
        # -not welded

        my ($self) = @_;

        # First check: skip if next line is not one deeper
        my $Knext_nonblank = $self->K_next_nonblank($K_last);
        return if ( !defined($Knext_nonblank) );
        my $rLL        = $self->[_rLL_];
        my $level_next = $rLL->[$Knext_nonblank]->[_LEVEL_];
        return if ( $level_next != $level_beg + 1 );

        # Find the parent container of the first token on the next line
        my $parent_seqno = $self->parent_seqno_by_K($Knext_nonblank);
        return unless ( defined($parent_seqno) );

        # Must not be a weld (can be unstable)
        return
          if ( $total_weld_count
            && $self->is_welded_at_seqno($parent_seqno) );

        # Opening container must exist and be on this line
        my $Ko = $self->[_K_opening_container_]->{$parent_seqno};
        return if ( !defined($Ko) || $Ko <= $K_first || $Ko > $K_last );

        # Verify that the closing container exists and is on a later line
        my $Kc = $self->[_K_closing_container_]->{$parent_seqno};
        return if ( !defined($Kc) || $Kc <= $K_last );

        # That's it
        $K_closing = $Kc;

        return;
    } ## end sub kgb_find_container_end

    sub kgb_add_to_group {
        my ( $self, $i, $token, $level ) = @_;

        # End the previous group if we have reached the maximum
        # group size
        if ( $rOpts_kgb_size_max && @group >= $rOpts_kgb_size_max ) {
            $self->kgb_end_group();
        }

        if ( @group == 0 ) {
            $ibeg      = $i;
            $level_beg = $level;
            $count     = 0;
        }

        $count++;
        $iend = $i;

        # New sub-group?
        if ( !@group || $token ne $group[-1]->[1] ) {
            push @subgroup, scalar(@group);
        }
        push @group, [ $i, $token, $count ];

        # remember if this line ends in an open container
        $self->kgb_find_container_end();

        return;
    } ## end sub kgb_add_to_group

    #---------------------
    # -kgb main subroutine
    #---------------------

    sub keyword_group_scan {
        my $self = shift;

        # Called once per file to process --keyword-group-blanks-* parameters.

        # Task:
        # Manipulate blank lines around keyword groups (kgb* flags)
        # Scan all lines looking for runs of consecutive lines beginning with
        # selected keywords.  Example keywords are 'my', 'our', 'local', ... but
        # they may be anything.  We will set flags requesting that blanks be
        # inserted around and within them according to input parameters.  Note
        # that we are scanning the lines as they came in in the input stream, so
        # they are not necessarily well formatted.

        # Returns:
        # The output of this sub is a return hash ref whose keys are the indexes
        # of lines after which we desire a blank line.  For line index $i:
        #  $rhash_of_desires->{$i} = 1 means we want a blank line AFTER line $i
        #  $rhash_of_desires->{$i} = 2 means we want blank line $i removed

        # Nothing to do if no blanks can be output. This test added to fix
        # case b760.
        if ( !$rOpts_maximum_consecutive_blank_lines ) {
            return $rhash_of_desires;
        }

        #---------------
        # initialization
        #---------------
        my $quit = kgb_initialize();
        if ($quit) { return $rhash_of_desires }

        my $rLL    = $self->[_rLL_];
        my $rlines = $self->[_rlines_];

        $self->kgb_end_group();
        my $i = -1;
        my $Opt_repeat_count =
          $rOpts->{'keyword-group-blanks-repeat-count'};    # '-kgbr'

        #----------------------------------
        # loop over all lines of the source
        #----------------------------------
        foreach my $line_of_tokens ( @{$rlines} ) {

            $i++;
            last
              if ( $Opt_repeat_count > 0
                && $number_of_groups_seen >= $Opt_repeat_count );

            kgb_initialize_line_vars();

            $line_type = $line_of_tokens->{_line_type};

            # always end a group at non-CODE
            if ( $line_type ne 'CODE' ) { $self->kgb_end_group(); next }

            $CODE_type = $line_of_tokens->{_code_type};

            # end any group at a format skipping line
            if ( $CODE_type && $CODE_type eq 'FS' ) {
                $self->kgb_end_group();
                next;
            }

            # continue in a verbatim (VB) type; it may be quoted text
            if ( $CODE_type eq 'VB' ) {
                if ( $ibeg >= 0 ) { $iend = $i; }
                next;
            }

            # and continue in blank (BL) types
            if ( $CODE_type eq 'BL' ) {
                if ( $ibeg >= 0 ) {
                    $iend = $i;
                    push @{iblanks}, $i;

                    # propagate current subgroup token
                    my $tok = $group[-1]->[1];
                    push @group, [ $i, $tok, $count ];
                }
                next;
            }

            # examine the first token of this line
            my $rK_range = $line_of_tokens->{_rK_range};
            ( $K_first, $K_last ) = @{$rK_range};
            if ( !defined($K_first) ) {

                # Somewhat unexpected blank line..
                # $rK_range is normally defined for line type CODE, but this can
                # happen for example if the input line was a single semicolon
                # which is being deleted.  In that case there was code in the
                # input file but it is not being retained. So we can silently
                # return.
                return $rhash_of_desires;
            }

            my $level    = $rLL->[$K_first]->[_LEVEL_];
            my $type     = $rLL->[$K_first]->[_TYPE_];
            my $token    = $rLL->[$K_first]->[_TOKEN_];
            my $ci_level = $rLL->[$K_first]->[_CI_LEVEL_];

            # End a group 'badly' at an unexpected level.  This will prevent
            # blank lines being incorrectly placed after the end of the group.
            # We are looking for any deviation from two acceptable patterns:
            #   PATTERN 1: a simple list; secondary lines are at level+1
            #   PATTERN 2: a long statement; all secondary lines same level
            # This was added as a fix for case b1177, in which a complex
            # structure got incorrectly inserted blank lines.
            if ( $ibeg >= 0 ) {

                # Check for deviation from PATTERN 1, simple list:
                if ( defined($K_closing) && $K_first < $K_closing ) {
                    $self->kgb_end_group(1) if ( $level != $level_beg + 1 );
                }

                # Check for deviation from PATTERN 2, single statement:
                elsif ( $level != $level_beg ) { $self->kgb_end_group(1) }
                else {
                    ## no deviation
                }
            }

            # Do not look for keywords in lists ( keyword 'my' can occur in
            # lists, see case b760); fixed for c048.
            if ( $self->is_list_by_K($K_first) ) {
                if ( $ibeg >= 0 ) { $iend = $i }
                next;
            }

            # see if this is a code type we seek (i.e. comment)
            if (   $CODE_type
                && $keyword_group_list_comment_pattern
                && $CODE_type =~ /$keyword_group_list_comment_pattern/ )
            {

                my $tok = $CODE_type;

                # Continuing a group
                if ( $ibeg >= 0 && $level == $level_beg ) {
                    $self->kgb_add_to_group( $i, $tok, $level );
                }

                # Start new group
                else {

                    # first end old group if any; we might be starting new
                    # keywords at different level
                    if ( $ibeg >= 0 ) { $self->kgb_end_group(); }
                    $self->kgb_add_to_group( $i, $tok, $level );
                }
                next;
            }

            # See if it is a keyword we seek, but never start a group in a
            # continuation line; the code may be badly formatted.
            if (   $ci_level == 0
                && $type eq 'k'
                && $token =~ /$keyword_group_list_pattern/ )
            {

                # Continuing a keyword group
                if ( $ibeg >= 0 && $level == $level_beg ) {
                    $self->kgb_add_to_group( $i, $token, $level );
                }

                # Start new keyword group
                else {

                    # first end old group if any; we might be starting new
                    # keywords at different level
                    if ( $ibeg >= 0 ) { $self->kgb_end_group(); }
                    $self->kgb_add_to_group( $i, $token, $level );
                }
                next;
            }

            # This is not one of our keywords, but we are in a keyword group
            # so see if we should continue or quit
            elsif ( $ibeg >= 0 ) {

                # - bail out on a large level change; we may have walked into a
                #   data structure or anonymous sub code.
                if ( $level > $level_beg + 1 || $level < $level_beg ) {
                    $self->kgb_end_group(1);
                    next;
                }

                # - keep going on a continuation line of the same level, since
                #   it is probably a continuation of our previous keyword,
                # - and keep going past hanging side comments because we never
                #   want to interrupt them.
                if ( ( ( $level == $level_beg ) && $ci_level > 0 )
                    || $CODE_type eq 'HSC' )
                {
                    $iend = $i;
                    next;
                }

                # - continue if if we are within in a container which started
                # with the line of the previous keyword.
                if ( defined($K_closing) && $K_first <= $K_closing ) {

                    # continue if entire line is within container
                    if ( $K_last <= $K_closing ) { $iend = $i; next }

                    # continue at ); or }; or ];
                    my $KK = $K_closing + 1;
                    if ( $rLL->[$KK]->[_TYPE_] eq ';' ) {
                        if ( $KK < $K_last ) {
                            if ( $rLL->[ ++$KK ]->[_TYPE_] eq 'b' ) { ++$KK }
                            if ( $KK > $K_last || $rLL->[$KK]->[_TYPE_] ne '#' )
                            {
                                $self->kgb_end_group(1);
                                next;
                            }
                        }
                        $iend = $i;
                        next;
                    }

                    $self->kgb_end_group(1);
                    next;
                }

                # - end the group if none of the above
                $self->kgb_end_group();
                next;
            }

            # not in a keyword group; continue
            else { next }
        } ## end of loop over all lines

        $self->kgb_end_group();
        return $rhash_of_desires;

    } ## end sub keyword_group_scan
} ## end closure keyword_group_scan

#######################################
# CODE SECTION 7: Process lines of code
#######################################

{    ## begin closure process_line_of_CODE

    # The routines in this closure receive lines of code and combine them into
    # 'batches' and send them along. A 'batch' is the unit of code which can be
    # processed further as a unit. It has the property that it is the largest
    # amount of code into which which perltidy is free to place one or more
    # line breaks within it without violating any constraints.

    # When a new batch is formed it is sent to sub 'grind_batch_of_code'.

    # flags needed by the store routine
    my $line_of_tokens;
    my $no_internal_newlines;
    my $CODE_type;
    my $current_line_starts_in_quote;

    # range of K of tokens for the current line
    my ( $K_first, $K_last );

    my ( $rLL, $radjusted_levels, $rparent_of_seqno, $rdepth_of_opening_seqno,
        $rblock_type_of_seqno, $ri_starting_one_line_block );

    # past stored nonblank tokens and flags
    my (
        $K_last_nonblank_code,       $K_dangling_elsif,
        $is_static_block_comment,    $last_CODE_type,
        $last_line_had_side_comment, $next_parent_seqno,
        $next_slevel,
    );

    # Called once at the start of a new file
    sub initialize_process_line_of_CODE {
        $K_last_nonblank_code       = undef;
        $K_dangling_elsif           = 0;
        $is_static_block_comment    = 0;
        $last_line_had_side_comment = 0;
        $next_parent_seqno          = SEQ_ROOT;
        $next_slevel                = undef;
        return;
    } ## end sub initialize_process_line_of_CODE

    # Batch variables: these describe the current batch of code being formed
    # and sent down the pipeline.  They are initialized in the next
    # sub.
    my (
        $rbrace_follower,   $index_start_one_line_block,
        $starting_in_quote, $ending_in_quote,
    );

    # Called before the start of each new batch
    sub initialize_batch_variables {

        # Initialize array values for a new batch.  Any changes here must be
        # carefully coordinated with sub store_token_to_go.

        $max_index_to_go            = UNDEFINED_INDEX;
        $summed_lengths_to_go[0]    = 0;
        $nesting_depth_to_go[0]     = 0;
        $ri_starting_one_line_block = [];

        # Redefine some sparse arrays.
        # It is more efficient to redefine these sparse arrays and rely on
        # undef's instead of initializing to 0's.  Testing showed that using
        # @array=() is more efficient than $#array=-1

        @old_breakpoint_to_go    = ();
        @forced_breakpoint_to_go = ();
        @block_type_to_go        = ();
        @mate_index_to_go        = ();
        @type_sequence_to_go     = ();

        # NOTE: @nobreak_to_go is sparse and could be treated this way, but
        # testing showed that there would be very little efficiency gain
        # because an 'if' test must be added in store_token_to_go.

        # The initialization code for the remaining batch arrays is as follows
        # and can be activated for testing.  But profiling shows that it is
        # time-consuming to re-initialize the batch arrays and is not necessary
        # because the maximum valid token, $max_index_to_go, is carefully
        # controlled.  This means however that it is not possible to do any
        # type of filter or map operation directly on these arrays.  And it is
        # not possible to use negative indexes. As a precaution against program
        # changes which might do this, sub pad_array_to_go adds some undefs at
        # the end of the current batch of data.

        ## 0 && do { #<<<
        ## @nobreak_to_go           = ();
        ## @token_lengths_to_go     = ();
        ## @levels_to_go            = ();
        ## @ci_levels_to_go         = ();
        ## @tokens_to_go            = ();
        ## @K_to_go                 = ();
        ## @types_to_go             = ();
        ## @leading_spaces_to_go    = ();
        ## @reduced_spaces_to_go    = ();
        ## @inext_to_go             = ();
        ## @parent_seqno_to_go      = ();
        ## };

        $rbrace_follower = undef;
        $ending_in_quote = 0;

        $index_start_one_line_block = undef;

        # initialize forced breakpoint vars associated with each output batch
        $forced_breakpoint_count      = 0;
        $index_max_forced_break       = UNDEFINED_INDEX;
        $forced_breakpoint_undo_count = 0;

        return;
    } ## end sub initialize_batch_variables

    sub leading_spaces_to_go {

        # return the number of indentation spaces for a token in the output
        # stream

        my ($ii) = @_;
        return 0 if ( $ii < 0 );
        my $indentation = $leading_spaces_to_go[$ii];
        return ref($indentation) ? $indentation->get_spaces() : $indentation;
    } ## end sub leading_spaces_to_go

    sub create_one_line_block {

        # set index starting next one-line block
        # call with no args to delete the current one-line block
        ($index_start_one_line_block) = @_;
        return;
    } ## end sub create_one_line_block

    # Routine to place the current token into the output stream.
    # Called once per output token.

    use constant DEBUG_STORE => 0;

    sub store_token_to_go {

        my ( $self, $Ktoken_vars, $rtoken_vars ) = @_;

        #-------------------------------------------------------
        # Token storage utility for sub process_line_of_CODE.
        # Add one token to the next batch of '_to_go' variables.
        #-------------------------------------------------------

        # Input parameters:
        #   $Ktoken_vars = the index K in the global token array
        #   $rtoken_vars = $rLL->[$Ktoken_vars] = the corresponding token values
        #                  unless they are temporarily being overridden

        #------------------------------------------------------------------
        # NOTE: called once per token so coding efficiency is critical here.
        # All changes need to be benchmarked with Devel::NYTProf.
        #------------------------------------------------------------------

        my (

            $type,
            $token,
            $ci_level,
            $level,
            $seqno,
            $length,

          ) = @{$rtoken_vars}[

          _TYPE_,
          _TOKEN_,
          _CI_LEVEL_,
          _LEVEL_,
          _TYPE_SEQUENCE_,
          _TOKEN_LENGTH_,

          ];

        # Check for emergency flush...
        # The K indexes in the batch must always be a continuous sequence of
        # the global token array.  The batch process programming assumes this.
        # If storing this token would cause this relation to fail we must dump
        # the current batch before storing the new token.  It is extremely rare
        # for this to happen. One known example is the following two-line
        # snippet when run with parameters
        # --noadd-newlines  --space-terminal-semicolon:
        #    if ( $_ =~ /PENCIL/ ) { $pencil_flag= 1 } ; ;
        #    $yy=1;
        if ( $max_index_to_go >= 0 ) {
            if ( $Ktoken_vars != $K_to_go[$max_index_to_go] + 1 ) {
                $self->flush_batch_of_CODE();
            }

            # Do not output consecutive blank tokens ... this should not
            # happen, but it is worth checking.  Later code can then make the
            # simplifying assumption that blank tokens are not consecutive.
            elsif ( $type eq 'b' && $types_to_go[$max_index_to_go] eq 'b' ) {

                if (DEVEL_MODE) {

                    # if this happens, it is may be that consecutive blanks
                    # were inserted into the token stream in 'respace_tokens'
                    my $lno = $rLL->[$Ktoken_vars]->[_LINE_INDEX_] + 1;
                    Fault("consecutive blanks near line $lno; please fix");
                }
                return;
            }
            else {
                ## all ok
            }
        }

        # Do not start a batch with a blank token.
        # Fixes cases b149 b888 b984 b985 b986 b987
        else {
            if ( $type eq 'b' ) { return }
        }

        # Update counter and do initializations if first token of new batch
        if ( !++$max_index_to_go ) {

            # Reset flag '$starting_in_quote' for a new batch.  It must be set
            # to the value of '$in_continued_quote', but here for efficiency we
            # set it to zero, which is its normal value. Then in coding below
            # we will change it if we find we are actually in a continued quote.
            $starting_in_quote = 0;

            # Update the next parent sequence number for each new batch.

            #----------------------------------------
            # Begin coding from sub parent_seqno_by_K
            #----------------------------------------

            # The following is equivalent to this call but much faster:
            #    $next_parent_seqno = $self->parent_seqno_by_K($Ktoken_vars);

            $next_parent_seqno = SEQ_ROOT;
            if ($seqno) {
                $next_parent_seqno = $rparent_of_seqno->{$seqno};
            }
            else {
                my $Kt = $rLL->[$Ktoken_vars]->[_KNEXT_SEQ_ITEM_];
                if ( defined($Kt) ) {
                    my $type_sequence_t = $rLL->[$Kt]->[_TYPE_SEQUENCE_];
                    my $type_t          = $rLL->[$Kt]->[_TYPE_];

                    # if next container token is closing, it is the parent seqno
                    if ( $is_closing_type{$type_t} ) {
                        $next_parent_seqno = $type_sequence_t;
                    }

                    # otherwise we want its parent container
                    else {
                        $next_parent_seqno =
                          $rparent_of_seqno->{$type_sequence_t};
                    }
                }
            }
            $next_parent_seqno = SEQ_ROOT
              if ( !defined($next_parent_seqno) );

            #--------------------------------------
            # End coding from sub parent_seqno_by_K
            #--------------------------------------

            $next_slevel = $rdepth_of_opening_seqno->[$next_parent_seqno] + 1;
        }

        # Clip levels to zero if there are level errors in the file.
        # We had to wait until now for reasons explained in sub 'write_line'.
        if ( $level < 0 ) { $level = 0 }

        # Safety check that length is defined. This is slow and should not be
        # needed now, so just do it in DEVEL_MODE to check programming changes.
        # Formerly needed for --indent-only, in which the entire set of tokens
        # is normally turned into type 'q'. Lengths are now defined in sub
        # 'respace_tokens' so this check is no longer needed.
        if ( DEVEL_MODE && !defined($length) ) {
            my $lno = $rLL->[$Ktoken_vars]->[_LINE_INDEX_] + 1;
            $length = length($token);
            Fault(<<EOM);
undefined length near line $lno; num chars=$length, token='$token'
EOM
        }

        #----------------------------
        # add this token to the batch
        #----------------------------
        $K_to_go[$max_index_to_go]             = $Ktoken_vars;
        $types_to_go[$max_index_to_go]         = $type;
        $tokens_to_go[$max_index_to_go]        = $token;
        $ci_levels_to_go[$max_index_to_go]     = $ci_level;
        $levels_to_go[$max_index_to_go]        = $level;
        $nobreak_to_go[$max_index_to_go]       = $no_internal_newlines;
        $token_lengths_to_go[$max_index_to_go] = $length;

        # Skip point initialization for these sparse arrays - undef's okay;
        # See also related code in sub initialize_batch_variables.
        ## $old_breakpoint_to_go[$max_index_to_go]    = 0;
        ## $forced_breakpoint_to_go[$max_index_to_go] = 0;
        ## $block_type_to_go[$max_index_to_go]        = EMPTY_STRING;
        ## $type_sequence_to_go[$max_index_to_go]     = $seqno;

        # NOTE:  nobreak_to_go can be treated as a sparse array, but testing
        # showed that there is almost no efficiency gain because an if test
        # would need to be added.

        # We keep a running sum of token lengths from the start of this batch:
        #   summed_lengths_to_go[$i]   = total length to just before token $i
        #   summed_lengths_to_go[$i+1] = total length to just after token $i
        $summed_lengths_to_go[ $max_index_to_go + 1 ] =
          $summed_lengths_to_go[$max_index_to_go] + $length;

        # Initialize some sequence-dependent variables to their normal values
        $parent_seqno_to_go[$max_index_to_go]  = $next_parent_seqno;
        $nesting_depth_to_go[$max_index_to_go] = $next_slevel;

        # Then fix them at container tokens:
        if ($seqno) {

            $type_sequence_to_go[$max_index_to_go] = $seqno;

            $block_type_to_go[$max_index_to_go] =
              $rblock_type_of_seqno->{$seqno};

            if ( $is_opening_token{$token} ) {

                my $slevel = $rdepth_of_opening_seqno->[$seqno];
                $nesting_depth_to_go[$max_index_to_go] = $slevel;
                $next_slevel = $slevel + 1;

                $next_parent_seqno = $seqno;

            }
            elsif ( $is_closing_token{$token} ) {

                $next_slevel = $rdepth_of_opening_seqno->[$seqno];
                my $slevel = $next_slevel + 1;
                $nesting_depth_to_go[$max_index_to_go] = $slevel;

                my $parent_seqno = $rparent_of_seqno->{$seqno};
                $parent_seqno = SEQ_ROOT unless defined($parent_seqno);
                $parent_seqno_to_go[$max_index_to_go] = $parent_seqno;
                $next_parent_seqno                    = $parent_seqno;

            }
            else {
                # ternary token: nothing to do
            }
        }

        # Define the indentation that this token will have in two cases:
        # Without CI = reduced_spaces_to_go
        # With CI    = leading_spaces_to_go
        $leading_spaces_to_go[$max_index_to_go] =
          $reduced_spaces_to_go[$max_index_to_go] =
          $rOpts_indent_columns * $radjusted_levels->[$Ktoken_vars];
        if ($ci_level) {
            $leading_spaces_to_go[$max_index_to_go] +=
              $rOpts_continuation_indentation;
        }

        # Correct these values if we are starting in a continued quote
        if (   $current_line_starts_in_quote
            && $Ktoken_vars == $K_first )
        {
            # in a continued quote - correct value set above if first token
            if ( $max_index_to_go == 0 ) { $starting_in_quote = 1 }

            $leading_spaces_to_go[$max_index_to_go] = 0;
            $reduced_spaces_to_go[$max_index_to_go] = 0;
        }

        DEBUG_STORE && do {
            my ( $a, $b, $c ) = caller();
            print {*STDOUT}
"STORE: from $a $c: storing token $token type $type lev=$level at $max_index_to_go\n";
        };
        return;
    } ## end sub store_token_to_go

    sub flush_batch_of_CODE {

        # Finish and process the current batch.
        # This must be the only call to grind_batch_of_CODE()
        my ($self) = @_;

        # If a batch has been started ...
        if ( $max_index_to_go >= 0 ) {

            # Create an array to hold variables for this batch
            my $this_batch = [];

            $this_batch->[_starting_in_quote_] = 1 if ($starting_in_quote);
            $this_batch->[_ending_in_quote_]   = 1 if ($ending_in_quote);

            if ( $CODE_type || $last_CODE_type ) {
                $this_batch->[_batch_CODE_type_] =
                    $K_to_go[$max_index_to_go] >= $K_first
                  ? $CODE_type
                  : $last_CODE_type;
            }

            $last_line_had_side_comment =
              ( $max_index_to_go > 0 && $types_to_go[$max_index_to_go] eq '#' );

            # The flag $is_static_block_comment applies to the line which just
            # arrived. So it only applies if we are outputting that line.
            if ( $is_static_block_comment && !$last_line_had_side_comment ) {
                $this_batch->[_is_static_block_comment_] =
                  $K_to_go[0] == $K_first;
            }

            $this_batch->[_ri_starting_one_line_block_] =
              $ri_starting_one_line_block;

            $self->[_this_batch_] = $this_batch;

            #-------------------
            # process this batch
            #-------------------
            $self->grind_batch_of_CODE();

            # Done .. this batch is history
            $self->[_this_batch_] = undef;

            initialize_batch_variables();
        }

        return;
    } ## end sub flush_batch_of_CODE

    sub end_batch {

        # End the current batch, EXCEPT for a few special cases
        my ($self) = @_;

        if ( $max_index_to_go < 0 ) {

            # nothing to do .. this is harmless but wastes time.
            if (DEVEL_MODE) {
                Fault("sub end_batch called with nothing to do; please fix\n");
            }
            return;
        }

        # Exceptions when a line does not end with a comment... (fixes c058)
        if ( $types_to_go[$max_index_to_go] ne '#' ) {

            # Exception 1: Do not end line in a weld
            return
              if ( $total_weld_count
                && $self->[_rK_weld_right_]->{ $K_to_go[$max_index_to_go] } );

            # Exception 2: just set a tentative breakpoint if we might be in a
            # one-line block
            if ( defined($index_start_one_line_block) ) {
                $self->set_forced_breakpoint($max_index_to_go);
                return;
            }
        }

        $self->flush_batch_of_CODE();
        return;
    } ## end sub end_batch

    sub flush_vertical_aligner {
        my ($self) = @_;
        my $vao = $self->[_vertical_aligner_object_];
        $vao->flush();
        return;
    } ## end sub flush_vertical_aligner

    # flush is called to output any tokens in the pipeline, so that
    # an alternate source of lines can be written in the correct order
    sub flush {
        my ( $self, $CODE_type_flush ) = @_;

        # end the current batch with 1 exception

        $index_start_one_line_block = undef;

        # Exception: if we are flushing within the code stream only to insert
        # blank line(s), then we can keep the batch intact at a weld. This
        # improves formatting of -ce.  See test 'ce1.ce'
        if ( $CODE_type_flush && $CODE_type_flush eq 'BL' ) {
            $self->end_batch() if ( $max_index_to_go >= 0 );
        }

        # otherwise, we have to shut things down completely.
        else { $self->flush_batch_of_CODE() }

        $self->flush_vertical_aligner();
        return;
    } ## end sub flush

    my %is_assignment_or_fat_comma;

    BEGIN {
        %is_assignment_or_fat_comma = %is_assignment;
        $is_assignment_or_fat_comma{'=>'} = 1;
    }

    sub add_missing_else {

        # Add a missing 'else' block.
        # $K_dangling_elsif = index of closing elsif brace not followed by else
        my ($self) = @_;

        # Make sure everything looks okay
        if (  !$K_dangling_elsif
            || $K_dangling_elsif < $K_first
            || $rLL->[$K_dangling_elsif]->[_TYPE_] ne '}' )
        {
            DEVEL_MODE && Fault("could not find closing elsif brace\n");
        }

        my $comment = $rOpts->{'add-missing-else-comment'};

        # Safety check
        if ( substr( $comment, 0, 1 ) ne '#' ) { $comment = '#' . $comment }

        # Calculate indentation
        my $level  = $radjusted_levels->[$K_dangling_elsif];
        my $spaces = SPACE x ( $level * $rOpts_indent_columns );
        my $line1  = $spaces . "else {\n";
        my $line3  = $spaces . "}\n";
        $spaces .= SPACE x $rOpts_indent_columns;
        my $line2 = $spaces . $comment . "\n";

        # clear the output pipeline
        $self->flush();

        my $file_writer_object = $self->[_file_writer_object_];

        $file_writer_object->write_code_line($line1);
        $file_writer_object->write_code_line($line2);
        $file_writer_object->write_code_line($line3);
        return;
    }

    sub process_line_of_CODE {

        my ( $self, $my_line_of_tokens ) = @_;

        #----------------------------------------------------------------
        # This routine is called once per INPUT line to format all of the
        # tokens on that line.
        #----------------------------------------------------------------

        # It outputs full-line comments and blank lines immediately.

        # For lines of code:
        # - Tokens are copied one-by-one from the global token
        #   array $rLL to a set of '_to_go' arrays which collect batches of
        #   tokens. This is done with calls to 'store_token_to_go'.
        # - A batch is closed and processed upon reaching a well defined
        #   structural break point (i.e. code block boundary) or forced
        #   breakpoint (i.e. side comment or special user controls).
        # - Subsequent stages of formatting make additional line breaks
        #   appropriate for lists and logical structures, and as necessary to
        #   keep line lengths below the requested maximum line length.

        #-----------------------------------
        # begin initialize closure variables
        #-----------------------------------
        $line_of_tokens = $my_line_of_tokens;
        my $rK_range = $line_of_tokens->{_rK_range};
        if ( !defined( $rK_range->[0] ) ) {

            # Empty line: This can happen if tokens are deleted, for example
            # with the -mangle parameter
            return;
        }

        ( $K_first, $K_last ) = @{$rK_range};
        $last_CODE_type               = $CODE_type;
        $CODE_type                    = $line_of_tokens->{_code_type};
        $current_line_starts_in_quote = $line_of_tokens->{_starting_in_quote};

        $rLL                     = $self->[_rLL_];
        $radjusted_levels        = $self->[_radjusted_levels_];
        $rparent_of_seqno        = $self->[_rparent_of_seqno_];
        $rdepth_of_opening_seqno = $self->[_rdepth_of_opening_seqno_];
        $rblock_type_of_seqno    = $self->[_rblock_type_of_seqno_];

        #---------------------------------
        # end initialize closure variables
        #---------------------------------

        # This flag will become nobreak_to_go and should be set to 2 to prevent
        # a line break AFTER the current token.
        $no_internal_newlines = 0;
        if ( !$rOpts_add_newlines || $CODE_type eq 'NIN' ) {
            $no_internal_newlines = 2;
        }

        my $input_line = $line_of_tokens->{_line_text};

        my ( $is_block_comment, $has_side_comment );
        if ( $rLL->[$K_last]->[_TYPE_] eq '#' ) {
            if   ( $K_last == $K_first ) { $is_block_comment = 1 }
            else                         { $has_side_comment = 1 }
        }

        my $is_static_block_comment_without_leading_space =
          $CODE_type eq 'SBCX';
        $is_static_block_comment =
          $CODE_type eq 'SBC' || $is_static_block_comment_without_leading_space;

        # check for a $VERSION statement
        if ( $CODE_type eq 'VER' ) {
            $self->[_saw_VERSION_in_this_file_] = 1;
            $no_internal_newlines = 2;
        }

        # Add interline blank if any
        my $last_old_nonblank_type   = "b";
        my $first_new_nonblank_token = EMPTY_STRING;
        my $K_first_true             = $K_first;
        if ( $max_index_to_go >= 0 ) {
            $last_old_nonblank_type   = $types_to_go[$max_index_to_go];
            $first_new_nonblank_token = $rLL->[$K_first]->[_TOKEN_];
            if (  !$is_block_comment
                && $types_to_go[$max_index_to_go] ne 'b'
                && $K_first > 0
                && $rLL->[ $K_first - 1 ]->[_TYPE_] eq 'b' )
            {
                $K_first -= 1;
            }
        }

        my $rtok_first = $rLL->[$K_first];

        my $in_quote = $line_of_tokens->{_ending_in_quote};
        $ending_in_quote = $in_quote;

        #------------------------------------
        # Handle a block (full-line) comment.
        #------------------------------------
        if ($is_block_comment) {

            if ( $rOpts->{'delete-block-comments'} ) {
                $self->flush();
                return;
            }

            $index_start_one_line_block = undef;
            $self->end_batch() if ( $max_index_to_go >= 0 );

            # output a blank line before block comments
            if (
                # unless we follow a blank or comment line
                $self->[_last_line_leading_type_] ne '#'
                && $self->[_last_line_leading_type_] ne 'b'

                # only if allowed
                && $rOpts->{'blanks-before-comments'}

                # if this is NOT an empty comment, unless it follows a side
                # comment and could become a hanging side comment.
                && (
                    $rtok_first->[_TOKEN_] ne '#'
                    || (   $last_line_had_side_comment
                        && $rLL->[$K_first]->[_LEVEL_] > 0 )
                )

                # not after a short line ending in an opening token
                # because we already have space above this comment.
                # Note that the first comment in this if block, after
                # the 'if (', does not get a blank line because of this.
                && !$self->[_last_output_short_opening_token_]

                # never before static block comments
                && !$is_static_block_comment
              )
            {
                $self->flush();    # switching to new output stream
                my $file_writer_object = $self->[_file_writer_object_];
                $file_writer_object->write_blank_code_line();
                $self->[_last_line_leading_type_] = 'b';
            }

            if (
                $rOpts->{'indent-block-comments'}
                && (  !$rOpts->{'indent-spaced-block-comments'}
                    || $input_line =~ /^\s+/ )
                && !$is_static_block_comment_without_leading_space
              )
            {
                my $Ktoken_vars = $K_first;
                my $rtoken_vars = $rLL->[$Ktoken_vars];
                $self->store_token_to_go( $Ktoken_vars, $rtoken_vars );
                $self->end_batch();
            }
            else {

                # switching to new output stream
                $self->flush();

                # Note that last arg in call here is 'undef' for comments
                my $file_writer_object = $self->[_file_writer_object_];
                $file_writer_object->write_code_line(
                    $rtok_first->[_TOKEN_] . "\n", undef );
                $self->[_last_line_leading_type_] = '#';
            }
            return;
        }

        #--------------------------------------------
        # Compare input/output indentation in logfile
        #--------------------------------------------
        if ( $self->[_save_logfile_] ) {

            my $guessed_indentation_level =
              $line_of_tokens->{_guessed_indentation_level};

            # Compare input/output indentation except for:
            #  - hanging side comments
            #  - continuation lines (have unknown leading blank space)
            #  - and lines which are quotes (they may have been outdented)
            my $exception =
                 $CODE_type eq 'HSC'
              || $rtok_first->[_CI_LEVEL_] > 0
              || $guessed_indentation_level == 0
              && $rtok_first->[_TYPE_] eq 'Q';

            if ( !$exception ) {
                my $input_line_number = $line_of_tokens->{_line_number};
                $self->compare_indentation_levels( $K_first,
                    $guessed_indentation_level, $input_line_number );
            }
        }

        #-----------------------------------------
        # Handle a line marked as indentation-only
        #-----------------------------------------

        if ( $CODE_type eq 'IO' ) {
            $self->flush();
            my $line = $input_line;

            # Fix for rt #125506 Unexpected string formatting
            # in which leading space of a terminal quote was removed
            $line =~ s/\s+$//;
            $line =~ s/^\s+// unless ( $line_of_tokens->{_starting_in_quote} );

            my $Ktoken_vars = $K_first;

            # We work with a copy of the token variables and change the
            # first token to be the entire line as a quote variable
            my $rtoken_vars = $rLL->[$Ktoken_vars];
            $rtoken_vars = copy_token_as_type( $rtoken_vars, 'q', $line );

            # Patch: length is not really important here but must be defined
            $rtoken_vars->[_TOKEN_LENGTH_] = length($line);

            $self->store_token_to_go( $Ktoken_vars, $rtoken_vars );
            $self->end_batch();
            return;
        }

        #---------------------------
        # Handle all other lines ...
        #---------------------------

        $K_dangling_elsif = 0;

        # This is a good place to kill incomplete one-line blocks
        if ( $max_index_to_go >= 0 ) {

            # For -iob and -lp, mark essential old breakpoints.
            # Fixes b1021 b1023 b1034 b1048 b1049 b1050 b1056 b1058
            # See related code below.
            if ( $rOpts_ignore_old_breakpoints && $rOpts_line_up_parentheses ) {
                my $type_first = $rLL->[$K_first_true]->[_TYPE_];
                if ( $is_assignment_or_fat_comma{$type_first} ) {
                    $old_breakpoint_to_go[$max_index_to_go] = 1;
                }
            }

            if (

                # this check needed -mangle (for example rt125012)
                (
                       ( !$index_start_one_line_block )
                    && ( $last_old_nonblank_type eq ';' )
                    && ( $first_new_nonblank_token ne '}' )
                )

                # Patch for RT #98902. Honor request to break at old commas.
                || (   $rOpts_break_at_old_comma_breakpoints
                    && $last_old_nonblank_type eq ',' )
              )
            {
                $forced_breakpoint_to_go[$max_index_to_go] = 1
                  if ($rOpts_break_at_old_comma_breakpoints);
                $index_start_one_line_block = undef;
                $self->end_batch();
            }

            # Keep any requested breaks before this line.  Note that we have to
            # use the original K_first because it may have been reduced above
            # to add a blank.  The value of the flag is as follows:
            #   1 => hard break, flush the batch
            #   2 => soft break, set breakpoint and continue building the batch
            # added check on max_index_to_go for c177
            if (   $max_index_to_go >= 0
                && $self->[_rbreak_before_Kfirst_]->{$K_first_true} )
            {
                $index_start_one_line_block = undef;
                if ( $self->[_rbreak_before_Kfirst_]->{$K_first_true} == 2 ) {
                    $self->set_forced_breakpoint($max_index_to_go);
                }
                else {
                    $self->end_batch();
                }
            }
        }

        #--------------------------------------
        # loop to process the tokens one-by-one
        #--------------------------------------
        $self->process_line_inner_loop($has_side_comment);

        # if there is anything left in the output buffer ...
        if ( $max_index_to_go >= 0 ) {

            my $type       = $rLL->[$K_last]->[_TYPE_];
            my $break_flag = $self->[_rbreak_after_Klast_]->{$K_last};

            # we have to flush ..
            if (

                # if there is a side comment...
                $type eq '#'

                # if this line ends in a quote
                # NOTE: This is critically important for insuring that quoted
                # lines do not get processed by things like -sot and -sct
                || $in_quote

                # if this is a VERSION statement
                || $CODE_type eq 'VER'

                # to keep a label at the end of a line
                || ( $type eq 'J' && $rOpts_break_after_labels != 2 )

                # if we have a hard break request
                || $break_flag && $break_flag != 2

                # if we are instructed to keep all old line breaks
                || !$rOpts->{'delete-old-newlines'}

                # if this is a line of the form 'use overload'. A break here in
                # the input file is a good break because it will allow the
                # operators which follow to be formatted well. Without this
                # break the formatting with -ci=4 -xci is poor, for example.

                #   use overload
                #     '+' => sub {
                #       print length $_[2], "\n";
                #       my ( $x, $y ) = _order(@_);
                #       Number::Roman->new( int $x + $y );
                #     },
                #     '-' => sub {
                #       my ( $x, $y ) = _order(@_);
                #       Number::Roman->new( int $x - $y );
                #     };
                || (   $max_index_to_go == 2
                    && $types_to_go[0] eq 'k'
                    && $tokens_to_go[0] eq 'use'
                    && $tokens_to_go[$max_index_to_go] eq 'overload' )
              )
            {
                $index_start_one_line_block = undef;
                $self->end_batch();
            }

            else {

                # Check for a soft break request
                if ( $break_flag && $break_flag == 2 ) {
                    $self->set_forced_breakpoint($max_index_to_go);
                }

                # mark old line breakpoints in current output stream
                if (
                    !$rOpts_ignore_old_breakpoints

                    # Mark essential old breakpoints if combination -iob -lp is
                    # used.  These two options do not work well together, but
                    # we can avoid turning -iob off by ignoring -iob at certain
                    # essential line breaks.  See also related code above.
                    # Fixes b1021 b1023 b1034 b1048 b1049 b1050 b1056 b1058
                    || (   $rOpts_line_up_parentheses
                        && $is_assignment_or_fat_comma{$type} )
                  )
                {
                    $old_breakpoint_to_go[$max_index_to_go] = 1;
                }
            }
        }

        if ( $K_dangling_elsif && $rOpts_add_missing_else ) {
            $self->add_missing_else();
        }

        return;
    } ## end sub process_line_of_CODE

    sub process_line_inner_loop {

        my ( $self, $has_side_comment ) = @_;

        #--------------------------------------------------------------------
        # Loop to move all tokens from one input line to a newly forming batch
        #--------------------------------------------------------------------

        # Do not start a new batch with a blank space
        if ( $max_index_to_go < 0 && $rLL->[$K_first]->[_TYPE_] eq 'b' ) {
            $K_first++;
        }

        foreach my $Ktoken_vars ( $K_first .. $K_last ) {

            my $rtoken_vars = $rLL->[$Ktoken_vars];

            #--------------
            # handle blanks
            #--------------
            if ( $rtoken_vars->[_TYPE_] eq 'b' ) {
                $self->store_token_to_go( $Ktoken_vars, $rtoken_vars );
                next;
            }

            #------------------
            # handle non-blanks
            #------------------
            my $type = $rtoken_vars->[_TYPE_];

            # If we are continuing after seeing a right curly brace, flush
            # buffer unless we see what we are looking for, as in
            #   } else ...
            if ($rbrace_follower) {
                my $token = $rtoken_vars->[_TOKEN_];
                if ( !$rbrace_follower->{$token} ) {
                    $self->end_batch() if ( $max_index_to_go >= 0 );
                }
                $rbrace_follower = undef;
            }

            my (
                $block_type,       $type_sequence,
                $is_opening_BLOCK, $is_closing_BLOCK,
                $nobreak_BEFORE_BLOCK
            );

            if ( $rtoken_vars->[_TYPE_SEQUENCE_] ) {

                my $token = $rtoken_vars->[_TOKEN_];
                $type_sequence = $rtoken_vars->[_TYPE_SEQUENCE_];
                $block_type    = $rblock_type_of_seqno->{$type_sequence};

                if (   $block_type
                    && $token eq $type
                    && $block_type ne 't'
                    && !$self->[_rshort_nested_]->{$type_sequence} )
                {

                    if ( $type eq '{' ) {
                        $is_opening_BLOCK     = 1;
                        $nobreak_BEFORE_BLOCK = $no_internal_newlines;
                    }
                    elsif ( $type eq '}' ) {
                        $is_closing_BLOCK     = 1;
                        $nobreak_BEFORE_BLOCK = $no_internal_newlines;
                    }
                    else {
                        ## error - block should be enclosed by curly brace
                        DEVEL_MODE && Fault(<<EOM);
block type '$block_type' has unexpected container type '$type'
EOM
                    }
                }
            }

            #---------------------
            # handle side comments
            #---------------------
            if ($has_side_comment) {

                # if at last token ...
                if ( $Ktoken_vars == $K_last ) {
                    $self->store_token_to_go( $Ktoken_vars, $rtoken_vars );
                    next;
                }

                # if before last token ... do not allow breaks which would
                # promote a side comment to a block comment
                if (   $Ktoken_vars == $K_last - 1
                    || $Ktoken_vars == $K_last - 2
                    && $rLL->[ $K_last - 1 ]->[_TYPE_] eq 'b' )
                {
                    $no_internal_newlines = 2;
                }
            }

            # Process non-blank and non-comment tokens ...

            #-----------------
            # handle semicolon
            #-----------------
            if ( $type eq ';' ) {

                my $next_nonblank_token_type = 'b';
                my $next_nonblank_token      = EMPTY_STRING;
                if ( $Ktoken_vars < $K_last ) {
                    my $Knnb = $Ktoken_vars + 1;
                    $Knnb++ if ( $rLL->[$Knnb]->[_TYPE_] eq 'b' );
                    $next_nonblank_token      = $rLL->[$Knnb]->[_TOKEN_];
                    $next_nonblank_token_type = $rLL->[$Knnb]->[_TYPE_];
                }

                if (   $rOpts_break_at_old_semicolon_breakpoints
                    && ( $Ktoken_vars == $K_first )
                    && $max_index_to_go >= 0
                    && !defined($index_start_one_line_block) )
                {
                    $self->end_batch();
                }

                $self->store_token_to_go( $Ktoken_vars, $rtoken_vars );

                $self->end_batch()
                  if (
                    !$no_internal_newlines
                    && (  !$rOpts_keep_interior_semicolons
                        || $Ktoken_vars >= $K_last )
                    && ( $next_nonblank_token ne '}' )
                  );
            }

            #-----------
            # handle '{'
            #-----------
            elsif ($is_opening_BLOCK) {

                # Tentatively output this token.  This is required before
                # calling starting_one_line_block.  We may have to unstore
                # it, though, if we have to break before it.
                $self->store_token_to_go( $Ktoken_vars, $rtoken_vars );

                # Look ahead to see if we might form a one-line block..
                my $too_long =
                  $self->starting_one_line_block( $Ktoken_vars,
                    $K_last_nonblank_code, $K_last );
                $self->clear_breakpoint_undo_stack();

                # to simplify the logic below, set a flag to indicate if
                # this opening brace is far from the keyword which introduces it
                my $keyword_on_same_line = 1;
                if (
                       $max_index_to_go >= 0
                    && defined($K_last_nonblank_code)
                    && $rLL->[$K_last_nonblank_code]->[_TYPE_] eq ')'
                    && ( ( $rtoken_vars->[_LEVEL_] < $levels_to_go[0] )
                        || $too_long )
                  )
                {
                    $keyword_on_same_line = 0;
                }

                # Break before '{' if requested with -bl or -bli flag
                my $want_break = $self->[_rbrace_left_]->{$type_sequence};

                # But do not break if this token is welded to the left
                if ( $total_weld_count
                    && defined( $self->[_rK_weld_left_]->{$Ktoken_vars} ) )
                {
                    $want_break = 0;
                }

                # Break BEFORE an opening '{' ...
                if (

                    # if requested
                    $want_break

                    # and we were unable to start looking for a block,
                    && !defined($index_start_one_line_block)

                    # or if it will not be on same line as its keyword, so that
                    # it will be outdented (eval.t, overload.t), and the user
                    # has not insisted on keeping it on the right
                    || (   !$keyword_on_same_line
                        && !$rOpts_opening_brace_always_on_right )
                  )
                {

                    # but only if allowed
                    if ( !$nobreak_BEFORE_BLOCK ) {

                        # since we already stored this token, we must unstore it
                        $self->unstore_token_to_go();

                        # then output the line
                        $self->end_batch() if ( $max_index_to_go >= 0 );

                        # and now store this token at the start of a new line
                        $self->store_token_to_go( $Ktoken_vars, $rtoken_vars );
                    }
                }

                # now output this line
                $self->end_batch()
                  if ( $max_index_to_go >= 0 && !$no_internal_newlines );
            }

            #-----------
            # handle '}'
            #-----------
            elsif ($is_closing_BLOCK) {

                my $next_nonblank_token_type = 'b';
                my $next_nonblank_token      = EMPTY_STRING;
                my $Knnb;
                if ( $Ktoken_vars < $K_last ) {
                    $Knnb = $Ktoken_vars + 1;
                    $Knnb++ if ( $rLL->[$Knnb]->[_TYPE_] eq 'b' );
                    $next_nonblank_token      = $rLL->[$Knnb]->[_TOKEN_];
                    $next_nonblank_token_type = $rLL->[$Knnb]->[_TYPE_];
                }

                # If there is a pending one-line block ..
                if ( defined($index_start_one_line_block) ) {

                    # Fix for b1208: if a side comment follows this closing
                    # brace then we must include its length in the length test
                    # ... unless the -issl flag is set (fixes b1307-1309).
                    # Assume a minimum of 1 blank space to the comment.
                    my $added_length = 0;
                    if (   $has_side_comment
                        && !$rOpts_ignore_side_comment_lengths
                        && $next_nonblank_token_type eq '#' )
                    {
                        $added_length = 1 + $rLL->[$K_last]->[_TOKEN_LENGTH_];
                    }

                    # we have to terminate it if..
                    if (

                        # it is too long (final length may be different from
                        # initial estimate). note: must allow 1 space for this
                        # token
                        $self->excess_line_length( $index_start_one_line_block,
                            $max_index_to_go ) + $added_length >= 0
                      )
                    {
                        $index_start_one_line_block = undef;
                    }
                }

                # put a break before this closing curly brace if appropriate
                $self->end_batch()
                  if ( $max_index_to_go >= 0
                    && !$nobreak_BEFORE_BLOCK
                    && !defined($index_start_one_line_block) );

                # store the closing curly brace
                $self->store_token_to_go( $Ktoken_vars, $rtoken_vars );

                # ok, we just stored a closing curly brace.  Often, but
                # not always, we want to end the line immediately.
                # So now we have to check for special cases.

                # if this '}' successfully ends a one-line block..
                my $one_line_block_type = EMPTY_STRING;
                my $keep_going;
                if ( defined($index_start_one_line_block) ) {

                    # Remember the type of token just before the
                    # opening brace.  It would be more general to use
                    # a stack, but this will work for one-line blocks.
                    $one_line_block_type =
                      $types_to_go[$index_start_one_line_block];

                    # we have to actually make it by removing tentative
                    # breaks that were set within it
                    $self->undo_forced_breakpoint_stack(0);

                    # For -lp, extend the nobreak to include a trailing
                    # terminal ','.  This is because the -lp indentation was
                    # not known when making one-line blocks, so we may be able
                    # to move the line back to fit.  Otherwise we may create a
                    # needlessly stranded comma on the next line.
                    my $iend_nobreak = $max_index_to_go - 1;
                    if (   $rOpts_line_up_parentheses
                        && $next_nonblank_token_type eq ','
                        && $Knnb eq $K_last )
                    {
                        my $p_seqno = $parent_seqno_to_go[$max_index_to_go];
                        my $is_excluded =
                          $self->[_ris_excluded_lp_container_]->{$p_seqno};
                        $iend_nobreak = $max_index_to_go if ( !$is_excluded );
                    }

                    $self->set_nobreaks( $index_start_one_line_block,
                        $iend_nobreak );

                    # save starting block indexes so that sub correct_lp can
                    # check and adjust -lp indentation (c098)
                    push @{$ri_starting_one_line_block},
                      $index_start_one_line_block;

                    # then re-initialize for the next one-line block
                    $index_start_one_line_block = undef;

                    # then decide if we want to break after the '}' ..
                    # We will keep going to allow certain brace followers as in:
                    #   do { $ifclosed = 1; last } unless $losing;
                    #
                    # But make a line break if the curly ends a
                    # significant block:
                    if (
                        (
                            $is_block_without_semicolon{$block_type}

                            # Follow users break point for
                            # one line block types U & G, such as a 'try' block
                            || $one_line_block_type =~ /^[UG]$/
                            && $Ktoken_vars == $K_last
                        )

                        # if needless semicolon follows we handle it later
                        && $next_nonblank_token ne ';'
                      )
                    {
                        $self->end_batch()
                          unless ($no_internal_newlines);
                    }
                }

                # set string indicating what we need to look for brace follower
                # tokens
                if ( $is_if_unless_elsif_else{$block_type} ) {
                    $rbrace_follower = undef;
                }
                elsif ( $block_type eq 'do' ) {
                    $rbrace_follower = \%is_do_follower;
                    if (
                        $self->tight_paren_follows( $K_to_go[0], $Ktoken_vars )
                      )
                    {
                        $rbrace_follower = { ')' => 1 };
                    }
                }

                # added eval for borris.t
                elsif ($is_sort_map_grep_eval{$block_type}
                    || $one_line_block_type eq 'G' )
                {
                    $rbrace_follower = undef;
                    $keep_going      = 1;
                }

                # anonymous sub
                elsif ( $self->[_ris_asub_block_]->{$type_sequence} ) {
                    if ($one_line_block_type) {

                        $rbrace_follower = \%is_anon_sub_1_brace_follower;

                        # Exceptions to help keep -lp intact, see git #74 ...
                        # Exception 1: followed by '}' on this line
                        if (   $Ktoken_vars < $K_last
                            && $next_nonblank_token eq '}' )
                        {
                            $rbrace_follower = undef;
                            $keep_going      = 1;
                        }

                        # Exception 2: followed by '}' on next line if -lp set.
                        # The -lp requirement allows the formatting to follow
                        # old breaks when -lp is not used, minimizing changes.
                        # Fixes issue c087.
                        elsif ($Ktoken_vars == $K_last
                            && $rOpts_line_up_parentheses )
                        {
                            my $K_closing_container =
                              $self->[_K_closing_container_];
                            my $p_seqno = $parent_seqno_to_go[$max_index_to_go];
                            my $Kc      = $K_closing_container->{$p_seqno};
                            my $is_excluded =
                              $self->[_ris_excluded_lp_container_]->{$p_seqno};
                            $keep_going =
                              (      defined($Kc)
                                  && $rLL->[$Kc]->[_TOKEN_] eq '}'
                                  && !$is_excluded
                                  && $Kc - $Ktoken_vars <= 2 );
                            $rbrace_follower = undef if ($keep_going);
                        }
                        else {
                            ## not an exception
                        }
                    }
                    else {
                        $rbrace_follower = \%is_anon_sub_brace_follower;
                    }
                }

                # None of the above: specify what can follow a closing
                # brace of a block which is not an
                # if/elsif/else/do/sort/map/grep/eval
                # Testfiles:
                # 'Toolbar.pm', 'Menubar.pm', bless.t, '3rules.pl', 'break1.t
                else {
                    $rbrace_follower = \%is_other_brace_follower;
                }

                # See if an elsif block is followed by another elsif or else;
                # complain if not.
                if ( $block_type eq 'elsif' ) {

                    # more code on this line ? ( this is unusual )
                    if (   $next_nonblank_token_type ne 'b'
                        && $next_nonblank_token_type ne '#' )
                    {
                        # check for 'elsif' or 'else'
                        if ( !$is_elsif_else{$next_nonblank_token} ) {
                            write_logfile_entry("(No else block)\n");

                            # Note that we cannot add a missing else block
                            # in this case because more code follows the
                            # closing elsif brace on the same line.
                            if ( $rOpts_warn_missing_else && !DEVEL_MODE ) {
                                my $lno =
                                  $rLL->[$Ktoken_vars]->[_LINE_INDEX_] + 1;
                                warning("$lno: No else block\n");
                            }
                        }
                    }

                    # no more code on this line, so check on next line
                    else {
                        my $K_next = $self->K_next_code($K_last);
                        if (   !defined($K_next)
                            || $rLL->[$K_next]->[_TYPE_] ne 'k'
                            || !$is_elsif_else{ $rLL->[$K_next]->[_TOKEN_] } )
                        {
                            $K_dangling_elsif = $Ktoken_vars;
                            write_logfile_entry("(No else block)\n");
                            if ( $rOpts_warn_missing_else && !DEVEL_MODE ) {
                                my $lno =
                                  $rLL->[$Ktoken_vars]->[_LINE_INDEX_] + 1;
                                if ($rOpts_add_missing_else) {
                                    warning(
                                        "$lno: Adding missing else block\n");
                                }
                                else {
                                    warning(
"$lno: No else block (use -ame to add one)\n"
                                    );
                                }
                            }
                        }
                    }
                }

                # keep going after certain block types (map,sort,grep,eval)
                # added eval for borris.t
                if ($keep_going) {

                    # keep going
                    $rbrace_follower = undef;

                }

                # if no more tokens, postpone decision until re-entering
                elsif ( ( $next_nonblank_token_type eq 'b' )
                    && $rOpts_add_newlines )
                {
                    if ( !$rbrace_follower ) {
                        $self->end_batch()
                          if (!$no_internal_newlines
                            && $max_index_to_go >= 0 );
                    }
                }
                elsif ($rbrace_follower) {

                    if ( $rbrace_follower->{$next_nonblank_token} ) {

                        # Fix for b1385: keep break after a comma following a
                        # 'do' block. This could also be used for other block
                        # types, but that would cause a significant change in
                        # existing formatting without much benefit.
                        if (   $next_nonblank_token eq ','
                            && $Knnb eq $K_last
                            && $block_type eq 'do'
                            && $rOpts_add_newlines
                            && $self->is_trailing_comma($Knnb) )
                        {
                            $self->[_rbreak_after_Klast_]->{$K_last} = 1;
                        }
                    }
                    else {
                        $self->end_batch()
                          if (!$no_internal_newlines
                            && $max_index_to_go >= 0 );
                    }

                    $rbrace_follower = undef;
                }

                else {
                    $self->end_batch()
                      if ( !$no_internal_newlines && $max_index_to_go >= 0 );
                }

            } ## end treatment of closing block token

            #------------------------------
            # handle here_doc target string
            #------------------------------
            elsif ( $type eq 'h' ) {

                # no newlines after seeing here-target
                $no_internal_newlines = 2;
                $self->store_token_to_go( $Ktoken_vars, $rtoken_vars );
            }

            #-----------------------------
            # handle all other token types
            #-----------------------------
            else {

                $self->store_token_to_go( $Ktoken_vars, $rtoken_vars );

                # break after a label if requested
                if (   $rOpts_break_after_labels
                    && $type eq 'J'
                    && $rOpts_break_after_labels == 1 )
                {
                    $self->end_batch()
                      unless ($no_internal_newlines);
                }
            }

            # remember previous nonblank, non-comment OUTPUT token
            $K_last_nonblank_code = $Ktoken_vars;

        } ## end of loop over all tokens in this line
        return;
    } ## end sub process_line_inner_loop

} ## end closure process_line_of_CODE

sub is_trailing_comma {
    my ( $self, $KK ) = @_;

    # Given:
    #   $KK - index of a comma in token list
    # Return:
    #   true if the comma at index $KK is a trailing comma
    #   false if not

    my $rLL     = $self->[_rLL_];
    my $type_KK = $rLL->[$KK]->[_TYPE_];
    if ( $type_KK ne ',' ) {
        DEVEL_MODE
          && Fault("Bad call: expected type ',' but received '$type_KK'\n");
        return;
    }
    my $Knnb = $self->K_next_nonblank($KK);
    if ( defined($Knnb) ) {
        my $type_sequence = $rLL->[$Knnb]->[_TYPE_SEQUENCE_];
        my $type_Knnb     = $rLL->[$Knnb]->[_TYPE_];
        if ( $type_sequence && $is_closing_type{$type_Knnb} ) {
            return 1;
        }
    }
    return;
} ## end sub is_trailing_comma

sub tight_paren_follows {

    my ( $self, $K_to_go_0, $K_ic ) = @_;

    # Input parameters:
    #   $K_to_go_0 = first token index K of this output batch (=K_to_go[0])
    #   $K_ic = index of the closing do brace (=K_to_go[$max_index_to_go])
    # Return parameter:
    #   false if we want a break after the closing do brace
    #   true if we do not want a break after the closing do brace

    # We are at the closing brace of a 'do' block.  See if this brace is
    # followed by a closing paren, and if so, set a flag which indicates
    # that we do not want a line break between the '}' and ')'.

    # xxxxx ( ...... do {  ... } ) {
    #                          ^-------looking at this brace, K_ic

    # Subscript notation:
    # _i = inner container (braces in this case)
    # _o = outer container (parens in this case)
    # _io = inner opening = '{'
    # _ic = inner closing = '}'
    # _oo = outer opening = '('
    # _oc = outer closing = ')'

    #       |--K_oo                 |--K_oc  = outer container
    # xxxxx ( ...... do {  ...... } ) {
    #                   |--K_io   |--K_ic    = inner container

    # In general, the safe thing to do is return a 'false' value
    # if the statement appears to be complex.  This will have
    # the downstream side-effect of opening up outer containers
    # to help make complex code readable.  But for simpler
    # do blocks it can be preferable to keep the code compact
    # by returning a 'true' value.

    return unless defined($K_ic);
    my $rLL = $self->[_rLL_];

    # we should only be called at a closing block
    my $seqno_i = $rLL->[$K_ic]->[_TYPE_SEQUENCE_];
    return unless ($seqno_i);    # shouldn't happen;

    # This only applies if the next nonblank is a ')'
    my $K_oc = $self->K_next_nonblank($K_ic);
    return unless defined($K_oc);
    my $token_next = $rLL->[$K_oc]->[_TOKEN_];
    return unless ( $token_next eq ')' );

    my $seqno_o = $rLL->[$K_oc]->[_TYPE_SEQUENCE_];
    my $K_io    = $self->[_K_opening_container_]->{$seqno_i};
    my $K_oo    = $self->[_K_opening_container_]->{$seqno_o};
    return unless ( defined($K_io) && defined($K_oo) );

    # RULE 1: Do not break before a closing signature paren
    # (regardless of complexity).  This is a fix for issue git#22.
    # Looking for something like:
    #   sub xxx ( ... do {  ... } ) {
    #                               ^----- next block_type
    my $K_test = $self->K_next_nonblank($K_oc);
    if ( defined($K_test) && $rLL->[$K_test]->[_TYPE_] eq '{' ) {
        my $seqno_test = $rLL->[$K_test]->[_TYPE_SEQUENCE_];
        if ($seqno_test) {
            if (   $self->[_ris_asub_block_]->{$seqno_test}
                || $self->[_ris_sub_block_]->{$seqno_test} )
            {
                return 1;
            }
        }
    }

    # RULE 2: Break if the contents within braces appears to be 'complex'.  We
    # base this decision on the number of tokens between braces.

    # xxxxx ( ... do {  ... } ) {
    #                 ^^^^^^

    # Although very simple, it has the advantages of (1) being insensitive to
    # changes in lengths of identifier names, (2) easy to understand, implement
    # and test.  A test case for this is 't/snippets/long_line.in'.

    # Example: $K_ic - $K_oo = 9       [Pass Rule 2]
    # if ( do { $2 !~ /&/ } ) { ... }

    # Example: $K_ic - $K_oo = 10      [Pass Rule 2]
    # for ( split /\s*={70,}\s*/, do { local $/; <DATA> }) { ... }

    # Example: $K_ic - $K_oo = 20      [Fail Rule 2]
    # test_zero_args( "do-returned list slice", do { ( 10, 11 )[ 2, 3 ]; });

    return if ( $K_ic - $K_io > 16 );

    # RULE 3: break if the code between the opening '(' and the '{' is 'complex'
    # As with the previous rule, we decide based on the token count

    # xxxxx ( ... do {  ... } ) {
    #        ^^^^^^^^

    # Example: $K_ic - $K_oo = 9       [Pass Rule 2]
    #          $K_io - $K_oo = 4       [Pass Rule 3]
    # if ( do { $2 !~ /&/ } ) { ... }

    # Example: $K_ic - $K_oo = 10    [Pass rule 2]
    #          $K_io - $K_oo = 9     [Pass rule 3]
    # for ( split /\s*={70,}\s*/, do { local $/; <DATA> }) { ... }

    return if ( $K_io - $K_oo > 9 );

    # RULE 4: Break if we have already broken this batch of output tokens
    return if ( $K_oo < $K_to_go_0 );

    # RULE 5: Break if input is not on one line
    # For example, we will set the flag for the following expression
    # written in one line:

    # This has: $K_ic - $K_oo = 10    [Pass rule 2]
    #           $K_io - $K_oo = 8     [Pass rule 3]
    #   $self->debug( 'Error: ' . do { local $/; <$err> } );

    # but we break after the brace if it is on multiple lines on input, since
    # the user may prefer it on multiple lines:

    # [Fail rule 5]
    #   $self->debug(
    #       'Error: ' . do { local $/; <$err> }
    #   );

    if ( !$rOpts_ignore_old_breakpoints ) {
        my $iline_oo = $rLL->[$K_oo]->[_LINE_INDEX_];
        my $iline_oc = $rLL->[$K_oc]->[_LINE_INDEX_];
        return if ( $iline_oo != $iline_oc );
    }

    # OK to keep the paren tight
    return 1;
} ## end sub tight_paren_follows

my %is_brace_semicolon_colon;

BEGIN {
    my @q = qw( { } ; : );
    @is_brace_semicolon_colon{@q} = (1) x scalar(@q);
}

sub starting_one_line_block {

    # After seeing an opening curly brace, look for the closing brace and see
    # if the entire block will fit on a line.  This routine is not always right
    # so a check is made later (at the closing brace) to make sure we really
    # have a one-line block.  We have to do this preliminary check, though,
    # because otherwise we would always break at a semicolon within a one-line
    # block if the block contains multiple statements.

    # Given:
    #  $Kj              = index of opening brace
    #  $K_last_nonblank = index of previous nonblank code token
    #  $K_last          = index of last token of input line

    # Calls 'create_one_line_block' if one-line block might be formed.

    # Also returns a flag '$too_long':
    #  true  = distance from opening keyword to OPENING brace exceeds
    #          the maximum line length.
    #  false (simple return) => not too long
    # Note that this flag is for distance from the statement start to the
    # OPENING brace, not the closing brace.

    my ( $self, $Kj, $K_last_nonblank, $K_last ) = @_;

    my $rbreak_container     = $self->[_rbreak_container_];
    my $rshort_nested        = $self->[_rshort_nested_];
    my $rLL                  = $self->[_rLL_];
    my $K_opening_container  = $self->[_K_opening_container_];
    my $rblock_type_of_seqno = $self->[_rblock_type_of_seqno_];

    # kill any current block - we can only go 1 deep
    create_one_line_block();

    my $i_start = 0;

    # This routine should not have been called if there are no tokens in the
    # 'to_go' arrays of previously stored tokens.  A previous call to
    # 'store_token_to_go' should have stored an opening brace. An error here
    # indicates that a programming change may have caused a flush operation to
    # clean out the previously stored tokens.
    if ( !defined($max_index_to_go) || $max_index_to_go < 0 ) {
        Fault("program bug: store_token_to_go called incorrectly\n")
          if (DEVEL_MODE);
        return;
    }

    # Return if block should be broken
    my $type_sequence_j = $rLL->[$Kj]->[_TYPE_SEQUENCE_];
    if ( $rbreak_container->{$type_sequence_j} ) {
        return;
    }

    my $ris_bli_container = $self->[_ris_bli_container_];
    my $is_bli            = $ris_bli_container->{$type_sequence_j};

    my $block_type = $rblock_type_of_seqno->{$type_sequence_j};
    $block_type = EMPTY_STRING unless ( defined($block_type) );

    my $previous_nonblank_token = EMPTY_STRING;
    my $i_last_nonblank         = -1;
    if ( defined($K_last_nonblank) ) {
        $i_last_nonblank = $K_last_nonblank - $K_to_go[0];
        if ( $i_last_nonblank >= 0 ) {
            $previous_nonblank_token = $rLL->[$K_last_nonblank]->[_TOKEN_];
        }
    }

    #---------------------------------------------------------------------
    # find the starting keyword for this block (such as 'if', 'else', ...)
    #---------------------------------------------------------------------
    if (
        $max_index_to_go == 0
        ##|| $block_type =~ /^[\{\}\;\:]$/
        || $is_brace_semicolon_colon{$block_type}
        || substr( $block_type, 0, 7 ) eq 'package'
      )
    {
        $i_start = $max_index_to_go;
    }

    # the previous nonblank token should start these block types
    elsif (
        $i_last_nonblank >= 0
        && (   $previous_nonblank_token eq $block_type
            || $self->[_ris_asub_block_]->{$type_sequence_j}
            || $self->[_ris_sub_block_]->{$type_sequence_j}
            || substr( $block_type, -2, 2 ) eq '()' )
      )
    {
        $i_start = $i_last_nonblank;

        # For signatures and extended syntax ...
        # If this brace follows a parenthesized list, we should look back to
        # find the keyword before the opening paren because otherwise we might
        # form a one line block which stays intact, and cause the parenthesized
        # expression to break open. That looks bad.
        if ( $tokens_to_go[$i_start] eq ')' ) {

            # Find the opening paren
            my $K_start = $K_to_go[$i_start];
            return unless defined($K_start);
            my $seqno = $type_sequence_to_go[$i_start];
            return unless ($seqno);
            my $K_opening = $K_opening_container->{$seqno};
            return if ( !defined($K_opening) );
            my $i_opening = $i_start + ( $K_opening - $K_start );

            # give up if not on this line
            return if ( $i_opening < 0 );
            $i_start = $i_opening;

            # go back one token before the opening paren
            if ( $i_start > 0 )                                  { $i_start-- }
            if ( $types_to_go[$i_start] eq 'b' && $i_start > 0 ) { $i_start--; }
            my $lev = $levels_to_go[$i_start];
            if ( $lev > $rLL->[$Kj]->[_LEVEL_] ) { return }
        }
    }

    elsif ( $previous_nonblank_token eq ')' ) {

        # For something like "if (xxx) {", the keyword "if" will be
        # just after the most recent break. This will be 0 unless
        # we have just killed a one-line block and are starting another.
        # (doif.t)
        # Note: cannot use inext_index_to_go[] here because that array
        # is still being constructed.
        $i_start = $index_max_forced_break + 1;
        if ( $types_to_go[$i_start] eq 'b' ) {
            $i_start++;
        }

        # Patch to avoid breaking short blocks defined with extended_syntax:
        # Strip off any trailing () which was added in the parser to mark
        # the opening keyword.  For example, in the following
        #    create( TypeFoo $e) {$bubba}
        # the blocktype would be marked as create()
        my $stripped_block_type = $block_type;
        if ( substr( $block_type, -2, 2 ) eq '()' ) {
            $stripped_block_type = substr( $block_type, 0, -2 );
        }
        if ( $tokens_to_go[$i_start] ne $stripped_block_type ) {
            return;
        }
    }

    # patch for SWITCH/CASE to retain one-line case/when blocks
    elsif ( $block_type eq 'case' || $block_type eq 'when' ) {

        # Note: cannot use inext_index_to_go[] here because that array
        # is still being constructed.
        $i_start = $index_max_forced_break + 1;
        if ( $types_to_go[$i_start] eq 'b' ) {
            $i_start++;
        }
        if ( $tokens_to_go[$i_start] ne $block_type ) {
            return;
        }
    }
    else {

        #-------------------------------------------
        # Couldn't find start - return too_long flag
        #-------------------------------------------
        return 1;
    }

    my $pos = total_line_length( $i_start, $max_index_to_go ) - 1;

    my $maximum_line_length =
      $maximum_line_length_at_level[ $levels_to_go[$i_start] ];

    # see if distance to the opening container is too great to even start
    if ( $pos > $maximum_line_length ) {

        #------------------------------
        # too long to the opening token
        #------------------------------
        return 1;
    }

    #-----------------------------------------------------------------------
    # OK so far: the statement is not to long just to the OPENING token. Now
    # see if everything to the closing token will fit on one line
    #-----------------------------------------------------------------------

    # This is part of an update to fix cases b562 .. b983
    my $K_closing = $self->[_K_closing_container_]->{$type_sequence_j};
    return unless ( defined($K_closing) );
    my $container_length = $rLL->[$K_closing]->[_CUMULATIVE_LENGTH_] -
      $rLL->[$Kj]->[_CUMULATIVE_LENGTH_];

    my $excess = $pos + 1 + $container_length - $maximum_line_length;

    # Add a small tolerance for welded tokens (case b901)
    if ( $total_weld_count && $self->is_welded_at_seqno($type_sequence_j) ) {
        $excess += 2;
    }

    if ( $excess > 0 ) {

        # line is too long...  there is no chance of forming a one line block
        # if the excess is more than 1 char
        return if ( $excess > 1 );

        # ... and give up if it is not a one-line block on input.
        # note: for a one-line block on input, it may be possible to keep
        # it as a one-line block (by removing a needless semicolon ).
        my $K_start = $K_to_go[$i_start];
        my $ldiff =
          $rLL->[$K_closing]->[_LINE_INDEX_] - $rLL->[$K_start]->[_LINE_INDEX_];
        return if ($ldiff);
    }

    #------------------------------------------------------------------
    # Loop to check contents and length of the potential one-line block
    #------------------------------------------------------------------
    foreach my $Ki ( $Kj + 1 .. $K_last ) {

        # old whitespace could be arbitrarily large, so don't use it
        if ( $rLL->[$Ki]->[_TYPE_] eq 'b' ) { $pos += 1 }
        else { $pos += $rLL->[$Ki]->[_TOKEN_LENGTH_] }

        # ignore some small blocks
        my $type_sequence_i = $rLL->[$Ki]->[_TYPE_SEQUENCE_];
        my $nobreak         = $rshort_nested->{$type_sequence_i};

        # Return false result if we exceed the maximum line length,
        if ( $pos > $maximum_line_length ) {
            return;
        }

        # keep going for non-containers
        elsif ( !$type_sequence_i ) {

        }

        # return if we encounter another opening brace before finding the
        # closing brace.
        elsif ($rLL->[$Ki]->[_TOKEN_] eq '{'
            && $rLL->[$Ki]->[_TYPE_] eq '{'
            && $rblock_type_of_seqno->{$type_sequence_i}
            && !$nobreak )
        {
            return;
        }

        # if we find our closing brace..
        elsif ($rLL->[$Ki]->[_TOKEN_] eq '}'
            && $rLL->[$Ki]->[_TYPE_] eq '}'
            && $rblock_type_of_seqno->{$type_sequence_i}
            && !$nobreak )
        {

            # be sure any trailing comment also fits on the line
            my $Ki_nonblank = $Ki;
            if ( $Ki_nonblank < $K_last ) {
                $Ki_nonblank++;
                if (   $rLL->[$Ki_nonblank]->[_TYPE_] eq 'b'
                    && $Ki_nonblank < $K_last )
                {
                    $Ki_nonblank++;
                }
            }

            # Patch for one-line sort/map/grep/eval blocks with side comments:
            # We will ignore the side comment length for sort/map/grep/eval
            # because this can lead to statements which change every time
            # perltidy is run.  Here is an example from Denis Moskowitz which
            # oscillates between these two states without this patch:

## --------
## grep { $_->foo ne 'bar' } # asdfa asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf
##  @baz;
##
## grep {
##     $_->foo ne 'bar'
##   }    # asdfa asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf
##   @baz;
## --------

            # When the first line is input it gets broken apart by the main
            # line break logic in sub process_line_of_CODE.
            # When the second line is input it gets recombined by
            # process_line_of_CODE and passed to the output routines.  The
            # output routines (break_long_lines) do not break it apart
            # because the bond strengths are set to the highest possible value
            # for grep/map/eval/sort blocks, so the first version gets output.
            # It would be possible to fix this by changing bond strengths,
            # but they are high to prevent errors in older versions of perl.
            # See c100 for eval test.
            if (   $Ki < $K_last
                && $rLL->[$K_last]->[_TYPE_] eq '#'
                && $rLL->[$K_last]->[_LEVEL_] == $rLL->[$Ki]->[_LEVEL_]
                && !$rOpts_ignore_side_comment_lengths
                && !$is_sort_map_grep_eval{$block_type}
                && $K_last - $Ki_nonblank <= 2 )
            {
                # Only include the side comment for if/else/elsif/unless if it
                # immediately follows (because the current '$rbrace_follower'
                # logic for these will give an immediate brake after these
                # closing braces).  So for example a line like this
                #     if (...) { ... } ; # very long comment......
                # will already break like this:
                #     if (...) { ... }
                #     ; # very long comment......
                # so we do not need to include the length of the comment, which
                # would break the block. Project 'bioperl' has coding like this.
                ##    !~ /^(if|else|elsif|unless)$/
                if (  !$is_if_unless_elsif_else{$block_type}
                    || $K_last == $Ki_nonblank )
                {
                    $Ki_nonblank = $K_last;
                    $pos += $rLL->[$Ki_nonblank]->[_TOKEN_LENGTH_];

                    if ( $Ki_nonblank > $Ki + 1 ) {

                        # source whitespace could be anything, assume
                        # at least one space before the hash on output
                        if ( $rLL->[ $Ki + 1 ]->[_TYPE_] eq 'b' ) {
                            $pos += 1;
                        }
                        else { $pos += $rLL->[ $Ki + 1 ]->[_TOKEN_LENGTH_] }
                    }

                    if ( $pos >= $maximum_line_length ) {
                        return;
                    }
                }
            }

            #--------------------------
            # ok, it's a one-line block
            #--------------------------
            create_one_line_block($i_start);
            return;
        }

        # just keep going for other characters
        else {
        }
    }

    #--------------------------------------------------
    # End Loop to examine tokens in potential one-block
    #--------------------------------------------------

    # We haven't hit the closing brace, but there is still space. So the
    # question here is, should we keep going to look at more lines in hopes of
    # forming a new one-line block, or should we stop right now. The problem
    # with continuing is that we will not be able to honor breaks before the
    # opening brace if we continue.

    # Typically we will want to keep trying to make one-line blocks for things
    # like sort/map/grep/eval.  But it is not always a good idea to make as
    # many one-line blocks as possible, so other types are not done.  The user
    # can always use -mangle.

    # If we want to keep going, we will create a new one-line block.
    # The blocks which we can keep going are in a hash, but we never want
    # to continue if we are at a '-bli' block.
    if ( $want_one_line_block{$block_type} && !$is_bli ) {
        my $rtype_count = $self->[_rtype_count_by_seqno_]->{$type_sequence_j};
        my $semicolon_count = $rtype_count
          && $rtype_count->{';'} ? $rtype_count->{';'} : 0;

        # Ignore a terminal semicolon in the count
        if ( $semicolon_count <= 2 ) {
            my $K_closing_container = $self->[_K_closing_container_];
            my $K_closing_j         = $K_closing_container->{$type_sequence_j};
            my $Kp                  = $self->K_previous_nonblank($K_closing_j);
            if ( defined($Kp)
                && $rLL->[$Kp]->[_TYPE_] eq ';' )
            {
                $semicolon_count -= 1;
            }
        }
        if ( $semicolon_count <= 0 ) {
            create_one_line_block($i_start);
        }
        elsif ( $semicolon_count == 1 && $block_type eq 'eval' ) {

            # Mark short broken eval blocks for possible later use in
            # avoiding adding spaces before a 'package' line. This is not
            # essential but helps keep newer and older formatting the same.
            $self->[_ris_short_broken_eval_block_]->{$type_sequence_j} = 1;
        }
        else {
            ## ok
        }
    }
    return;
} ## end sub starting_one_line_block

sub unstore_token_to_go {

    # remove most recent token from output stream
    my $self = shift;
    if ( $max_index_to_go > 0 ) {
        $max_index_to_go--;
    }
    else {
        $max_index_to_go = UNDEFINED_INDEX;
    }
    return;
} ## end sub unstore_token_to_go

sub compare_indentation_levels {

    # Check to see if output line tabbing agrees with input line
    # this can be very useful for debugging a script which has an extra
    # or missing brace.

    my ( $self, $K_first, $guessed_indentation_level, $line_number ) = @_;
    return unless ( defined($K_first) );

    my $rLL = $self->[_rLL_];

    # ignore a line with a leading blank token - issue c195
    my $type = $rLL->[$K_first]->[_TYPE_];
    return if ( $type eq 'b' );

    my $structural_indentation_level = $self->[_radjusted_levels_]->[$K_first];

    # record max structural depth for log file
    if ( $structural_indentation_level > $self->[_maximum_BLOCK_level_] ) {
        $self->[_maximum_BLOCK_level_]         = $structural_indentation_level;
        $self->[_maximum_BLOCK_level_at_line_] = $line_number;
    }

    my $type_sequence = $rLL->[$K_first]->[_TYPE_SEQUENCE_];
    my $is_closing_block =
         $type_sequence
      && $self->[_rblock_type_of_seqno_]->{$type_sequence}
      && $type eq '}';

    if ( $guessed_indentation_level ne $structural_indentation_level ) {
        $self->[_last_tabbing_disagreement_] = $line_number;

        if ($is_closing_block) {

            if ( !$self->[_in_brace_tabbing_disagreement_] ) {
                $self->[_in_brace_tabbing_disagreement_] = $line_number;
            }
            if ( !$self->[_first_brace_tabbing_disagreement_] ) {
                $self->[_first_brace_tabbing_disagreement_] = $line_number;
            }
        }

        if ( !$self->[_in_tabbing_disagreement_] ) {
            $self->[_tabbing_disagreement_count_]++;

            if ( $self->[_tabbing_disagreement_count_] <= MAX_NAG_MESSAGES ) {
                write_logfile_entry(
"Start indentation disagreement: input=$guessed_indentation_level; output=$structural_indentation_level\n"
                );
            }
            $self->[_in_tabbing_disagreement_]    = $line_number;
            $self->[_first_tabbing_disagreement_] = $line_number
              unless ( $self->[_first_tabbing_disagreement_] );
        }
    }
    else {

        $self->[_in_brace_tabbing_disagreement_] = 0 if ($is_closing_block);

        my $in_tabbing_disagreement = $self->[_in_tabbing_disagreement_];
        if ($in_tabbing_disagreement) {

            if ( $self->[_tabbing_disagreement_count_] <= MAX_NAG_MESSAGES ) {
                write_logfile_entry(
"End indentation disagreement from input line $in_tabbing_disagreement\n"
                );

                if ( $self->[_tabbing_disagreement_count_] == MAX_NAG_MESSAGES )
                {
                    write_logfile_entry(
                        "No further tabbing disagreements will be noted\n");
                }
            }
            $self->[_in_tabbing_disagreement_] = 0;

        }
    }
    return;
} ## end sub compare_indentation_levels

###################################################
# CODE SECTION 8: Utilities for setting breakpoints
###################################################

{    ## begin closure set_forced_breakpoint

    my @forced_breakpoint_undo_stack;

    # These are global vars for efficiency:
    # my $forced_breakpoint_count;
    # my $forced_breakpoint_undo_count;
    # my $index_max_forced_break;

    # Break before or after certain tokens based on user settings
    my %break_before_or_after_token;

    BEGIN {

        # Updated to use all operators. This fixes case b1054
        # Here is the previous simplified version:
        ## my @q = qw( . : ? and or xor && || );
        my @q = @all_operators;

        push @q, ',';
        @break_before_or_after_token{@q} = (1) x scalar(@q);
    } ## end BEGIN

    sub set_fake_breakpoint {

        # Just bump up the breakpoint count as a signal that there are breaks.
        # This is useful if we have breaks but may want to postpone deciding
        # where to make them.
        $forced_breakpoint_count++;
        return;
    } ## end sub set_fake_breakpoint

    use constant DEBUG_FORCE => 0;

    sub set_forced_breakpoint {
        my ( $self, $i ) = @_;

        # Set a breakpoint AFTER the token at index $i in the _to_go arrays.

        # Exceptions:
        # - If the token at index $i is a blank, backup to $i-1 to
        #   get to the previous nonblank token.
        # - For certain tokens, the break may be placed BEFORE the token
        #   at index $i, depending on user break preference settings.
        # - If a break is made after an opening token, then a break will
        #   also be made before the corresponding closing token.

        # Returns '$i_nonblank':
        #   = index of the token after which the breakpoint was actually placed
        #   = undef if breakpoint was not set.
        my $i_nonblank;

        if ( !defined($i) || $i < 0 ) {

            # Calls with bad index $i are harmless but waste time and should
            # be caught and eliminated during code development.
            if (DEVEL_MODE) {
                my ( $a, $b, $c ) = caller();
                Fault(
"Bad call to forced breakpoint from $a $b $c ; called with i=$i; please fix\n"
                );
            }
            return;
        }

        # Break after token $i
        $i_nonblank = $self->set_forced_breakpoint_AFTER($i);

        # If we break at an opening container..break at the closing
        my $set_closing;
        if ( defined($i_nonblank)
            && $is_opening_sequence_token{ $tokens_to_go[$i_nonblank] } )
        {
            $set_closing = 1;
            $self->set_closing_breakpoint($i_nonblank);
        }

        DEBUG_FORCE && do {
            my ( $a, $b, $c ) = caller();
            my $msg =
"FORCE $forced_breakpoint_count after call from $a $c with i=$i max=$max_index_to_go";
            if ( !defined($i_nonblank) ) {
                $i = EMPTY_STRING unless defined($i);
                $msg .= " but could not set break after i='$i'\n";
            }
            else {
                my $nobr = $nobreak_to_go[$i_nonblank];
                $nobr = 0 if ( !defined($nobr) );
                $msg .= <<EOM;
set break after $i_nonblank: tok=$tokens_to_go[$i_nonblank] type=$types_to_go[$i_nonblank] nobr=$nobr
EOM
                if ( defined($set_closing) ) {
                    $msg .=
" Also set closing breakpoint corresponding to this token\n";
                }
            }
            print {*STDOUT} $msg;
        };

        return $i_nonblank;
    } ## end sub set_forced_breakpoint

    sub set_forced_breakpoint_AFTER {
        my ( $self, $i ) = @_;

        # This routine is only called by sub set_forced_breakpoint and
        # sub set_closing_breakpoint.

        # Set a breakpoint AFTER the token at index $i in the _to_go arrays.

        # Exceptions:
        # - If the token at index $i is a blank, backup to $i-1 to
        #   get to the previous nonblank token.
        # - For certain tokens, the break may be placed BEFORE the token
        #   at index $i, depending on user break preference settings.

        # Returns:
        #   - the index of the token after which the break was set, or
        #   - undef if no break was set

        return if ( !defined($i) );
        return if ( $i < 0 );

        # Back up at a blank so we have a token to examine.
        # This was added to fix for cases like b932 involving an '=' break.
        if ( $i > 0 && $types_to_go[$i] eq 'b' ) { $i-- }

        # Never break between welded tokens
        return
          if ( $total_weld_count
            && $self->[_rK_weld_right_]->{ $K_to_go[$i] } );

        my $token = $tokens_to_go[$i];
        my $type  = $types_to_go[$i];

        # For certain tokens, use user settings to decide if we break before or
        # after it
        if ( $break_before_or_after_token{$token}
            && ( $type eq $token || $type eq 'k' ) )
        {
            if ( $want_break_before{$token} && $i >= 0 ) { $i-- }
        }

        # breaks are forced before 'if' and 'unless'
        elsif ( $is_if_unless{$token} && $type eq 'k' ) { $i-- }
        else {
            ## ok
        }

        if ( $i >= 0 && $i <= $max_index_to_go ) {
            my $i_nonblank = ( $types_to_go[$i] ne 'b' ) ? $i : $i - 1;

            if (   $i_nonblank >= 0
                && !$nobreak_to_go[$i_nonblank]
                && !$forced_breakpoint_to_go[$i_nonblank] )
            {
                $forced_breakpoint_to_go[$i_nonblank] = 1;

                if ( $i_nonblank > $index_max_forced_break ) {
                    $index_max_forced_break = $i_nonblank;
                }
                $forced_breakpoint_count++;
                $forced_breakpoint_undo_stack[ $forced_breakpoint_undo_count++ ]
                  = $i_nonblank;

                # success
                return $i_nonblank;
            }
        }
        return;
    } ## end sub set_forced_breakpoint_AFTER

    sub clear_breakpoint_undo_stack {
        my ($self) = @_;
        $forced_breakpoint_undo_count = 0;
        return;
    }

    use constant DEBUG_UNDOBP => 0;

    sub undo_forced_breakpoint_stack {

        my ( $self, $i_start ) = @_;

        # Given $i_start, a non-negative index the 'undo stack' of breakpoints,
        # remove all breakpoints from the top of the 'undo stack' down to and
        # including index $i_start.

        # The 'undo stack' is a stack of all breakpoints made for a batch of
        # code.

        if ( $i_start < 0 ) {
            $i_start = 0;
            my ( $a, $b, $c ) = caller();

            # Bad call, can only be due to a recent programming change.
            Fault(
"Program Bug: undo_forced_breakpoint_stack from $a $c has bad i=$i_start "
            ) if (DEVEL_MODE);
            return;
        }

        while ( $forced_breakpoint_undo_count > $i_start ) {
            my $i =
              $forced_breakpoint_undo_stack[ --$forced_breakpoint_undo_count ];
            if ( $i >= 0 && $i <= $max_index_to_go ) {
                $forced_breakpoint_to_go[$i] = 0;
                $forced_breakpoint_count--;

                DEBUG_UNDOBP && do {
                    my ( $a, $b, $c ) = caller();
                    print {*STDOUT}
"UNDOBP: undo forced_breakpoint i=$i $forced_breakpoint_undo_count from $a $c max=$max_index_to_go\n";
                };
            }

            # shouldn't happen, but not a critical error
            else {
                if (DEVEL_MODE) {
                    my ( $a, $b, $c ) = caller();
                    Fault(<<EOM);
Program Bug: undo_forced_breakpoint from $a $c has i=$i but max=$max_index_to_go
EOM
                }
            }
        }
        return;
    } ## end sub undo_forced_breakpoint_stack
} ## end closure set_forced_breakpoint

{    ## begin closure set_closing_breakpoint

    my %postponed_breakpoint;

    sub initialize_postponed_breakpoint {
        %postponed_breakpoint = ();
        return;
    }

    sub has_postponed_breakpoint {
        my ($seqno) = @_;
        return $postponed_breakpoint{$seqno};
    }

    sub set_closing_breakpoint {

        # set a breakpoint at a matching closing token
        my ( $self, $i_break ) = @_;

        if ( defined( $mate_index_to_go[$i_break] ) ) {

            # Don't reduce the '2' in the statement below.
            # Test files: attrib.t, BasicLyx.pm.html
            if ( $mate_index_to_go[$i_break] > $i_break + 2 ) {

             # break before } ] and ), but sub set_forced_breakpoint will decide
             # to break before or after a ? and :
                my $inc = ( $tokens_to_go[$i_break] eq '?' ) ? 0 : 1;
                $self->set_forced_breakpoint_AFTER(
                    $mate_index_to_go[$i_break] - $inc );
            }
        }
        else {
            my $type_sequence = $type_sequence_to_go[$i_break];
            if ($type_sequence) {
                $postponed_breakpoint{$type_sequence} = 1;
            }
        }
        return;
    } ## end sub set_closing_breakpoint
} ## end closure set_closing_breakpoint

#########################################
# CODE SECTION 9: Process batches of code
#########################################

{    ## begin closure grind_batch_of_CODE

    # The routines in this closure begin the processing of a 'batch' of code.

    # A variable to keep track of consecutive nonblank lines so that we can
    # insert occasional blanks
    my @nonblank_lines_at_depth;

    # A variable to remember maximum size of previous batches; this is needed
    # by the logical padding routine
    my $peak_batch_size;
    my $batch_count;

    # variables to keep track of indentation of unmatched containers.
    my %saved_opening_indentation;

    sub initialize_grind_batch_of_CODE {
        @nonblank_lines_at_depth   = ();
        $peak_batch_size           = 0;
        $batch_count               = 0;
        %saved_opening_indentation = ();
        return;
    } ## end sub initialize_grind_batch_of_CODE

    # sub grind_batch_of_CODE receives sections of code which are the longest
    # possible lines without a break.  In other words, it receives what is left
    # after applying all breaks forced by blank lines, block comments, side
    # comments, pod text, and structural braces.  Its job is to break this code
    # down into smaller pieces, if necessary, which fit within the maximum
    # allowed line length.  Then it sends the resulting lines of code on down
    # the pipeline to the VerticalAligner package, breaking the code into
    # continuation lines as necessary.  The batch of tokens are in the "to_go"
    # arrays.  The name 'grind' is slightly suggestive of a machine continually
    # breaking down long lines of code, but mainly it is unique and easy to
    # remember and find with an editor search.

    # The two routines 'process_line_of_CODE' and 'grind_batch_of_CODE' work
    # together in the following way:

    # - 'process_line_of_CODE' receives the original INPUT lines one-by-one and
    # combines them into the largest sequences of tokens which might form a new
    # line.
    # - 'grind_batch_of_CODE' determines which tokens will form the OUTPUT
    # lines.

    # So sub 'process_line_of_CODE' builds up the longest possible continuous
    # sequences of tokens, regardless of line length, and then
    # grind_batch_of_CODE breaks these sequences back down into the new output
    # lines.

    # Sub 'grind_batch_of_CODE' ships its output lines to the vertical aligner.

    use constant DEBUG_GRIND => 0;

    sub check_grind_input {

        # Check for valid input to sub grind_batch_of_CODE.  An error here
        # would most likely be due to an error in 'sub store_token_to_go'.
        my ($self) = @_;

        # Be sure there are tokens in the batch
        if ( $max_index_to_go < 0 ) {
            Fault(<<EOM);
sub grind incorrectly called with max_index_to_go=$max_index_to_go
EOM
        }
        my $Klimit = $self->[_Klimit_];

        # The local batch tokens must be a continuous part of the global token
        # array.
        my $KK;
        foreach my $ii ( 0 .. $max_index_to_go ) {

            my $Km = $KK;

            $KK = $K_to_go[$ii];
            if ( !defined($KK) || $KK < 0 || $KK > $Klimit ) {
                $KK = '(undef)' unless defined($KK);
                Fault(<<EOM);
at batch index at i=$ii, the value of K_to_go[$ii] = '$KK' is out of the valid range (0 - $Klimit)
EOM
            }

            if ( $ii > 0 && $KK != $Km + 1 ) {
                my $im = $ii - 1;
                Fault(<<EOM);
Non-sequential K indexes: i=$im has Km=$Km; but i=$ii has K=$KK;  expecting K = Km+1
EOM
            }
        }
        return;
    } ## end sub check_grind_input

    # This filter speeds up a critical if-test
    my %quick_filter;

    BEGIN {
        my @q = qw# L { ( [ R ] ) } ? : f => #;
        push @q, ',';
        @quick_filter{@q} = (1) x scalar(@q);
    }

    sub grind_batch_of_CODE {

        my ($self) = @_;

        #-----------------------------------------------------------------
        # This sub directs the formatting of one complete batch of tokens.
        # The tokens of the batch are in the '_to_go' arrays.
        #-----------------------------------------------------------------

        my $this_batch = $self->[_this_batch_];
        $this_batch->[_peak_batch_size_] = $peak_batch_size;
        $this_batch->[_batch_count_]     = ++$batch_count;

        $self->check_grind_input() if (DEVEL_MODE);

        # This routine is only called from sub flush_batch_of_code, so that
        # routine is a better spot for debugging.
        DEBUG_GRIND && do {
            my $token = my $type = EMPTY_STRING;
            if ( $max_index_to_go >= 0 ) {
                $token = $tokens_to_go[$max_index_to_go];
                $type  = $types_to_go[$max_index_to_go];
            }
            my $output_str = EMPTY_STRING;
            if ( $max_index_to_go > 20 ) {
                my $mm = $max_index_to_go - 10;
                $output_str =
                  join( EMPTY_STRING, @tokens_to_go[ 0 .. 10 ] ) . " ... "
                  . join( EMPTY_STRING,
                    @tokens_to_go[ $mm .. $max_index_to_go ] );
            }
            else {
                $output_str = join EMPTY_STRING,
                  @tokens_to_go[ 0 .. $max_index_to_go ];
            }
            print {*STDOUT} <<EOM;
grind got batch number $batch_count with $max_index_to_go tokens, last type '$type' tok='$token', text:
$output_str
EOM
        };

        # Remove any trailing blank, which is possible (c192 has example)
        if ( $max_index_to_go >= 0 && $types_to_go[$max_index_to_go] eq 'b' ) {
            $max_index_to_go -= 1;
        }

        return if ( $max_index_to_go < 0 );

        my $lp_object_count_this_batch;
        if ($rOpts_line_up_parentheses) {
            $this_batch->[_lp_object_count_this_batch_] =
              $lp_object_count_this_batch = $self->set_lp_indentation();
        }

        #-----------------------------------------------------------
        # Shortcut for block comments. But not for block comments
        # with lp because they must use the lp corrector step below.
        #-----------------------------------------------------------
        if (  !$max_index_to_go
            && $types_to_go[0] eq '#'
            && !$lp_object_count_this_batch )
        {
            my $ibeg = 0;
            $this_batch->[_ri_first_] = [$ibeg];
            $this_batch->[_ri_last_]  = [$ibeg];

            $self->convey_batch_to_vertical_aligner();

            my $level = $levels_to_go[$ibeg];
            $self->[_last_line_leading_type_]  = $types_to_go[$ibeg];
            $self->[_last_line_leading_level_] = $level;
            $nonblank_lines_at_depth[$level]   = 1;
            return;
        }

        #-------------
        # Normal route
        #-------------

        my $rLL = $self->[_rLL_];

        #-------------------------------------------------------
        # Loop over the batch to initialize some batch variables
        #-------------------------------------------------------
        my $comma_count_in_batch = 0;
        my @colon_list;
        my @ix_seqno_controlling_ci;
        my %comma_arrow_count;
        my $comma_arrow_count_contained = 0;
        my @unmatched_closing_indexes_in_this_batch;
        my @unmatched_opening_indexes_in_this_batch;

        my @i_for_semicolon;
        foreach my $i ( 0 .. $max_index_to_go ) {

            if ( $types_to_go[$i] eq 'b' ) {
                $inext_to_go[$i] = $inext_to_go[ $i - 1 ] = $i + 1;
                next;
            }

            $inext_to_go[$i] = $i + 1;

            # This is an optional shortcut to save a bit of time by skipping
            # most tokens.  Note: the filter may need to be updated if the
            # next 'if' tests are ever changed to include more token types.
            next if ( !$quick_filter{ $types_to_go[$i] } );

            my $type = $types_to_go[$i];

            # gather info needed by sub break_long_lines
            if ( $type_sequence_to_go[$i] ) {
                my $seqno = $type_sequence_to_go[$i];
                my $token = $tokens_to_go[$i];

                # remember indexes of any tokens controlling xci
                # in this batch. This list is needed by sub undo_ci.
                if ( $self->[_ris_seqno_controlling_ci_]->{$seqno} ) {
                    push @ix_seqno_controlling_ci, $i;
                }

                if ( $is_opening_sequence_token{$token} ) {
                    if ( $self->[_rbreak_container_]->{$seqno} ) {
                        $self->set_forced_breakpoint($i);
                    }
                    push @unmatched_opening_indexes_in_this_batch, $i;
                    if ( $type eq '?' ) {
                        push @colon_list, $type;
                    }
                }
                else {    ##  $is_closing_sequence_token{$token}

                    if ( $i > 0 && $self->[_rbreak_container_]->{$seqno} ) {
                        $self->set_forced_breakpoint( $i - 1 );
                    }

                    my $i_mate = pop @unmatched_opening_indexes_in_this_batch;
                    if ( defined($i_mate) && $i_mate >= 0 ) {
                        if ( $type_sequence_to_go[$i_mate] ==
                            $type_sequence_to_go[$i] )
                        {
                            $mate_index_to_go[$i]      = $i_mate;
                            $mate_index_to_go[$i_mate] = $i;
                            my $cac = $comma_arrow_count{$seqno};
                            $comma_arrow_count_contained += $cac if ($cac);
                        }
                        else {
                            push @unmatched_opening_indexes_in_this_batch,
                              $i_mate;
                            push @unmatched_closing_indexes_in_this_batch, $i;
                        }
                    }
                    else {
                        push @unmatched_closing_indexes_in_this_batch, $i;
                    }
                    if ( $type eq ':' ) {
                        push @colon_list, $type;
                    }
                }

            } ## end if ($seqno)

            elsif ( $type eq ',' ) { $comma_count_in_batch++; }
            elsif ( $type eq '=>' ) {
                if (@unmatched_opening_indexes_in_this_batch) {
                    my $j     = $unmatched_opening_indexes_in_this_batch[-1];
                    my $seqno = $type_sequence_to_go[$j];
                    $comma_arrow_count{$seqno}++;
                }
            }
            elsif ( $type eq 'f' ) {
                push @i_for_semicolon, $i;
            }
            else {
                ## not a special type
            }

        } ## end for ( my $i = 0 ; $i <=...)

        # Break at a single interior C-style for semicolon in this batch (c154)
        if ( @i_for_semicolon && @i_for_semicolon == 1 ) {
            my $i     = $i_for_semicolon[0];
            my $inext = $inext_to_go[$i];
            if ( $inext <= $max_index_to_go && $types_to_go[$inext] ne '#' ) {
                $self->set_forced_breakpoint($i);
            }
        }

        my $is_unbalanced_batch = @unmatched_opening_indexes_in_this_batch +
          @unmatched_closing_indexes_in_this_batch;

        if (@unmatched_opening_indexes_in_this_batch) {
            $this_batch->[_runmatched_opening_indexes_] =
              \@unmatched_opening_indexes_in_this_batch;
        }

        if (@ix_seqno_controlling_ci) {
            $this_batch->[_rix_seqno_controlling_ci_] =
              \@ix_seqno_controlling_ci;
        }

        #------------------------
        # Set special breakpoints
        #------------------------
        # If this line ends in a code block brace, set breaks at any
        # previous closing code block braces to breakup a chain of code
        # blocks on one line.  This is very rare but can happen for
        # user-defined subs.  For example we might be looking at this:
        #  BOOL { $server_data{uptime} > 0; } NUM { $server_data{load}; } STR {
        my $saw_good_break;    # flag to force breaks even if short line
        if (

            # looking for opening or closing block brace
            $block_type_to_go[$max_index_to_go]

            # never any good breaks if just one token
            && $max_index_to_go > 0

            # but not one of these which are never duplicated on a line:
            # until|while|for|if|elsif|else
            && !$is_block_without_semicolon{ $block_type_to_go[$max_index_to_go]
            }
          )
        {
            my $lev = $nesting_depth_to_go[$max_index_to_go];

            # Walk backwards from the end and
            # set break at any closing block braces at the same level.
            # But quit if we are not in a chain of blocks.
            foreach my $i ( reverse( 0 .. $max_index_to_go - 1 ) ) {
                last if ( $levels_to_go[$i] < $lev );   # stop at a lower level
                next if ( $levels_to_go[$i] > $lev );   # skip past higher level

                if ( $block_type_to_go[$i] ) {
                    if ( $tokens_to_go[$i] eq '}' ) {
                        $self->set_forced_breakpoint($i);
                        $saw_good_break = 1;
                    }
                }

                # quit if we see anything besides words, function, blanks
                # at this level
                elsif ( $types_to_go[$i] !~ /^[\(\)Gwib]$/ ) { last }
                else {
                    ## keep going
                }
            }
        }

        #-----------------------------------------------
        # insertion of any blank lines before this batch
        #-----------------------------------------------

        my $imin = 0;
        my $imax = $max_index_to_go;

        # trim any blank tokens - for safety, but should not be necessary
        if ( $types_to_go[$imin] eq 'b' ) { $imin++ }
        if ( $types_to_go[$imax] eq 'b' ) { $imax-- }

        if ( $imin > $imax ) {
            if (DEVEL_MODE) {
                my $K0  = $K_to_go[0];
                my $lno = EMPTY_STRING;
                if ( defined($K0) ) { $lno = $rLL->[$K0]->[_LINE_INDEX_] + 1 }
                Fault(<<EOM);
Strange: received batch containing only blanks near input line $lno: after trimming imin=$imin, imax=$imax
EOM
            }
            return;
        }

        my $last_line_leading_type  = $self->[_last_line_leading_type_];
        my $last_line_leading_level = $self->[_last_line_leading_level_];

        my $leading_type  = $types_to_go[0];
        my $leading_level = $levels_to_go[0];

        # add blank line(s) before certain key types but not after a comment
        if ( $last_line_leading_type ne '#' ) {
            my $blank_count   = 0;
            my $leading_token = $tokens_to_go[0];

            # break before certain key blocks except one-liners
            if ( $leading_type eq 'k' ) {
                if ( $leading_token eq 'BEGIN' || $leading_token eq 'END' ) {
                    $blank_count = $rOpts->{'blank-lines-before-subs'}
                      if ( terminal_type_i( 0, $max_index_to_go ) ne '}' );
                }

                # Break before certain block types if we haven't had a
                # break at this level for a while.  This is the
                # difficult decision..
                elsif ($last_line_leading_type ne 'b'
                    && $is_if_unless_while_until_for_foreach{$leading_token} )
                {
                    my $lc = $nonblank_lines_at_depth[$last_line_leading_level];
                    if ( !defined($lc) ) { $lc = 0 }

                    # patch for RT #128216: no blank line inserted at a level
                    # change
                    if ( $levels_to_go[0] != $last_line_leading_level ) {
                        $lc = 0;
                    }

                    if (   $rOpts->{'blanks-before-blocks'}
                        && $lc >= $rOpts->{'long-block-line-count'}
                        && $self->consecutive_nonblank_lines() >=
                        $rOpts->{'long-block-line-count'}
                        && terminal_type_i( 0, $max_index_to_go ) ne '}' )
                    {
                        $blank_count = 1;
                    }
                }
                else {
                    ## no blank
                }
            }

            # blank lines before subs except declarations and one-liners
            # Fix for c250: added new type 'P', changed 'i' to 'S'
            elsif ( $leading_type eq 'S' || $leading_type eq 'P' ) {
                my $special_identifier =
                  $self->[_ris_special_identifier_token_]->{$leading_token};
                if ($special_identifier) {
                    ##   $leading_token =~ /$SUB_PATTERN/
                    if ( $special_identifier eq 'sub' ) {

                        $blank_count = $rOpts->{'blank-lines-before-subs'}
                          if ( terminal_type_i( 0, $max_index_to_go ) !~
                            /^[\;\}\,]$/ );
                    }

                    # break before all package declarations
                    ##      substr( $leading_token, 0, 8 ) eq 'package '
                    elsif ( $special_identifier eq 'package' ) {

                        # ... except in a very short eval block
                        my $pseqno = $parent_seqno_to_go[0];
                        $blank_count = $rOpts->{'blank-lines-before-packages'}
                          if (
                            !$self->[_ris_short_broken_eval_block_]->{$pseqno}
                          );
                    }
                    else {
                        DEVEL_MODE && Fault(<<EOM);
Found special identifier '$special_identifier', but expecting 'sub' or 'package'
EOM
                    }
                }
            }

            # Check for blank lines wanted before a closing brace
            elsif ( $leading_token eq '}' ) {
                if (   $rOpts->{'blank-lines-before-closing-block'}
                    && $block_type_to_go[0]
                    && $block_type_to_go[0] =~
                    /$blank_lines_before_closing_block_pattern/ )
                {
                    my $nblanks = $rOpts->{'blank-lines-before-closing-block'};
                    if ( $nblanks > $blank_count ) {
                        $blank_count = $nblanks;
                    }
                }
            }
            else {
                ## ok
            }

            if ($blank_count) {

                # future: send blank line down normal path to VerticalAligner?
                $self->flush_vertical_aligner();
                my $file_writer_object = $self->[_file_writer_object_];
                $file_writer_object->require_blank_code_lines($blank_count);
            }
        }

        # update blank line variables and count number of consecutive
        # non-blank, non-comment lines at this level
        if (   $leading_level == $last_line_leading_level
            && $leading_type ne '#'
            && defined( $nonblank_lines_at_depth[$leading_level] ) )
        {
            $nonblank_lines_at_depth[$leading_level]++;
        }
        else {
            $nonblank_lines_at_depth[$leading_level] = 1;
        }

        $self->[_last_line_leading_type_]  = $leading_type;
        $self->[_last_line_leading_level_] = $leading_level;

        #--------------------------
        # scan lists and long lines
        #--------------------------

        # Flag to remember if we called sub 'pad_array_to_go'.
        # Some routines (break_lists(), break_long_lines() ) need some
        # extra tokens added at the end of the batch.  Most batches do not
        # use these routines, so we will avoid calling 'pad_array_to_go'
        # unless it is needed.
        my $called_pad_array_to_go;

        # set all forced breakpoints for good list formatting
        my $is_long_line;
        my $multiple_old_lines_in_batch;
        if ( $max_index_to_go > 0 ) {
            $is_long_line =
              $self->excess_line_length( $imin, $max_index_to_go ) > 0;

            my $Kbeg = $K_to_go[0];
            my $Kend = $K_to_go[$max_index_to_go];
            $multiple_old_lines_in_batch =
              $rLL->[$Kend]->[_LINE_INDEX_] - $rLL->[$Kbeg]->[_LINE_INDEX_];
        }

        # Optional optimization: avoid calling break_lists for a single block
        # brace.  This is done by turning off the flag $is_unbalanced_batch.
        elsif ($is_unbalanced_batch) {
            my $block_type = $block_type_to_go[0];
            if (   $block_type
                && !$lp_object_count_this_batch
                && $is_block_without_semicolon{$block_type} )
            {
                # opening blocks can skip break_lists call if no commas in
                # container.
                if ( $leading_type eq '{' ) {
                    my $seqno       = $type_sequence_to_go[0];
                    my $rtype_count = $self->[_rtype_count_by_seqno_]->{$seqno};
                    if ($rtype_count) {
                        my $comma_count = $rtype_count->{','};
                        if ( !$comma_count ) {
                            $is_unbalanced_batch = 0;
                        }
                    }
                }

                # closing block braces can be skipped
                else {
                    $is_unbalanced_batch = 0;
                }

            }
        }
        else {
            ## ok - single token
        }

        my $rbond_strength_bias = [];
        if (
               $is_long_line
            || $multiple_old_lines_in_batch

            # must always call break_lists() with unbalanced batches because
            # it is maintaining some stacks
            || $is_unbalanced_batch

            # call break_lists if we might want to break at commas
            || (
                $comma_count_in_batch
                && (   $rOpts_maximum_fields_per_table > 0
                    && $rOpts_maximum_fields_per_table <= $comma_count_in_batch
                    || $rOpts_comma_arrow_breakpoints == 0 )
            )

            # call break_lists if user may want to break open some one-line
            # hash references
            || (   $comma_arrow_count_contained
                && $rOpts_comma_arrow_breakpoints != 3 )
          )
        {
            # add a couple of extra terminal blank tokens
            $self->pad_array_to_go();
            $called_pad_array_to_go = 1;

            my $sgb = $self->break_lists( $is_long_line, $rbond_strength_bias );
            $saw_good_break ||= $sgb;
        }

        # let $ri_first and $ri_last be references to lists of
        # first and last tokens of line fragments to output..
        my ( $ri_first, $ri_last );

        #-----------------------------
        # a single token uses one line
        #-----------------------------
        if ( !$max_index_to_go ) {
            $ri_first = [$imin];
            $ri_last  = [$imax];
        }

        # for multiple tokens
        else {

            #-------------------------
            # write a single line if..
            #-------------------------
            if (
                (

                    # this line is 'short'
                    !$is_long_line

                    # and we didn't see a good breakpoint
                    && !$saw_good_break

                    # and we don't already have an interior breakpoint
                    && !$forced_breakpoint_count
                )

                # or, we aren't allowed to add any newlines
                || !$rOpts_add_newlines

              )
            {
                $ri_first = [$imin];
                $ri_last  = [$imax];
            }

            #-----------------------------
            # otherwise use multiple lines
            #-----------------------------
            else {

                # add a couple of extra terminal blank tokens if we haven't
                # already done so
                $self->pad_array_to_go() unless ($called_pad_array_to_go);

                ( $ri_first, $ri_last, my $rbond_strength_to_go ) =
                  $self->break_long_lines( $saw_good_break, \@colon_list,
                    $rbond_strength_bias );

                $self->break_all_chain_tokens( $ri_first, $ri_last );

                $self->break_equals( $ri_first, $ri_last )
                  if @{$ri_first} >= 3;

                # now we do a correction step to clean this up a bit
                # (The only time we would not do this is for debugging)
                $self->recombine_breakpoints( $ri_first, $ri_last,
                    $rbond_strength_to_go )
                  if ( $rOpts_recombine && @{$ri_first} > 1 );

                $self->insert_final_ternary_breaks( $ri_first, $ri_last )
                  if (@colon_list);
            }

            $self->insert_breaks_before_list_opening_containers( $ri_first,
                $ri_last )
              if ( %break_before_container_types && $max_index_to_go > 0 );

            # Check for a phantom semicolon at the end of the batch
            if ( !$token_lengths_to_go[$imax] && $types_to_go[$imax] eq ';' ) {
                $self->unmask_phantom_token($imax);
            }

            if ( $rOpts_one_line_block_semicolons == 0 ) {
                $self->delete_one_line_semicolons( $ri_first, $ri_last );
            }

            # Remember the largest batch size processed. This is needed by the
            # logical padding routine to avoid padding the first nonblank token
            if ( $max_index_to_go > $peak_batch_size ) {
                $peak_batch_size = $max_index_to_go;
            }
        }

        #-------------------
        # -lp corrector step
        #-------------------
        if ($lp_object_count_this_batch) {
            $self->correct_lp_indentation( $ri_first, $ri_last );
        }

        #--------------------
        # ship this batch out
        #--------------------
        $this_batch->[_ri_first_] = $ri_first;
        $this_batch->[_ri_last_]  = $ri_last;

        $self->convey_batch_to_vertical_aligner();

        #-------------------------------------------------------------------
        # Write requested number of blank lines after an opening block brace
        #-------------------------------------------------------------------
        if ($rOpts_blank_lines_after_opening_block) {
            my $iterm = $imax;
            if ( $types_to_go[$iterm] eq '#' && $iterm > $imin ) {
                $iterm -= 1;
                if ( $types_to_go[$iterm] eq 'b' && $iterm > $imin ) {
                    $iterm -= 1;
                }
            }

            if (   $types_to_go[$iterm] eq '{'
                && $block_type_to_go[$iterm]
                && $block_type_to_go[$iterm] =~
                /$blank_lines_after_opening_block_pattern/ )
            {
                my $nblanks = $rOpts_blank_lines_after_opening_block;
                $self->flush_vertical_aligner();
                my $file_writer_object = $self->[_file_writer_object_];
                $file_writer_object->require_blank_code_lines($nblanks);
            }
        }

        return;
    } ## end sub grind_batch_of_CODE

    sub iprev_to_go {
        my ($i) = @_;

        # Given index $i of a token in the '_to_go' arrays, return
        # the index of the previous nonblank token.
        return $i - 1 > 0
          && $types_to_go[ $i - 1 ] eq 'b' ? $i - 2 : $i - 1;
    }

    sub unmask_phantom_token {
        my ( $self, $iend ) = @_;

        # Turn a phantom token into a real token.

        # Input parameter:
        #   $iend = the index in the output batch array of this token.

        # Phantom tokens are specially marked token types (such as ';')  with
        # no token text which only become real tokens if they occur at the end
        # of an output line.  At one time phantom ',' tokens were handled
        # here, but now they are processed elsewhere.

        my $rLL         = $self->[_rLL_];
        my $KK          = $K_to_go[$iend];
        my $line_number = 1 + $rLL->[$KK]->[_LINE_INDEX_];

        my $type = $types_to_go[$iend];
        return unless ( $type eq ';' );
        my $tok     = $type;
        my $tok_len = length($tok);
        if ( $want_left_space{$type} != WS_NO ) {
            $tok = SPACE . $tok;
            $tok_len += 1;
        }

        $tokens_to_go[$iend]        = $tok;
        $token_lengths_to_go[$iend] = $tok_len;

        $rLL->[$KK]->[_TOKEN_]        = $tok;
        $rLL->[$KK]->[_TOKEN_LENGTH_] = $tok_len;

        $self->note_added_semicolon($line_number);

        # This changes the summed lengths of the rest of this batch
        foreach ( $iend .. $max_index_to_go ) {
            $summed_lengths_to_go[ $_ + 1 ] += $tok_len;
        }
        return;
    } ## end sub unmask_phantom_token

    sub save_opening_indentation {

        # This should be called after each batch of tokens is output. It
        # saves indentations of lines of all unmatched opening tokens.
        # These will be used by sub get_opening_indentation.

        my ( $self, $ri_first, $ri_last, $rindentation_list,
            $runmatched_opening_indexes )
          = @_;

        $runmatched_opening_indexes = []
          if ( !defined($runmatched_opening_indexes) );

        # QW INDENTATION PATCH 1:
        # Also save indentation for multiline qw quotes
        my @i_qw;
        my $seqno_qw_opening;
        if ( $types_to_go[$max_index_to_go] eq 'q' ) {
            my $KK = $K_to_go[$max_index_to_go];
            $seqno_qw_opening =
              $self->[_rstarting_multiline_qw_seqno_by_K_]->{$KK};
            if ($seqno_qw_opening) {
                push @i_qw, $max_index_to_go;
            }
        }

        # we need to save indentations of any unmatched opening tokens
        # in this batch because we may need them in a subsequent batch.
        foreach ( @{$runmatched_opening_indexes}, @i_qw ) {

            my $seqno = $type_sequence_to_go[$_];

            if ( !$seqno ) {
                if ( $seqno_qw_opening && $_ == $max_index_to_go ) {
                    $seqno = $seqno_qw_opening;
                }
                else {

                    # shouldn't happen
                    $seqno = 'UNKNOWN';
                    DEVEL_MODE && Fault("unable to find sequence number\n");
                }
            }

            $saved_opening_indentation{$seqno} = [
                lookup_opening_indentation(
                    $_, $ri_first, $ri_last, $rindentation_list
                )
            ];
        }
        return;
    } ## end sub save_opening_indentation

    sub get_saved_opening_indentation {
        my ($seqno) = @_;
        my ( $indent, $offset, $is_leading, $exists ) = ( 0, 0, 0, 0 );

        if ($seqno) {
            if ( $saved_opening_indentation{$seqno} ) {
                ( $indent, $offset, $is_leading ) =
                  @{ $saved_opening_indentation{$seqno} };
                $exists = 1;
            }
        }

        # some kind of serious error it doesn't exist
        # (example is badfile.t)

        return ( $indent, $offset, $is_leading, $exists );
    } ## end sub get_saved_opening_indentation
} ## end closure grind_batch_of_CODE

sub lookup_opening_indentation {

    # get the indentation of the line in the current output batch
    # which output a selected opening token
    #
    # given:
    #   $i_opening - index of an opening token in the current output batch
    #                whose line indentation we need
    #   $ri_first - reference to list of the first index $i for each output
    #               line in this batch
    #   $ri_last - reference to list of the last index $i for each output line
    #              in this batch
    #   $rindentation_list - reference to a list containing the indentation
    #            used for each line.  (NOTE: the first slot in
    #            this list is the last returned line number, and this is
    #            followed by the list of indentations).
    #
    # return
    #   -the indentation of the line which contained token $i_opening
    #   -and its offset (number of columns) from the start of the line

    my ( $i_opening, $ri_start, $ri_last, $rindentation_list ) = @_;

    if ( !@{$ri_last} ) {

        # An error here implies a bug introduced by a recent program change.
        # Every batch of code has lines, so this should never happen.
        if (DEVEL_MODE) {
            Fault("Error in opening_indentation: no lines");
        }
        return ( 0, 0, 0 );
    }

    my $nline = $rindentation_list->[0];    # line number of previous lookup

    # reset line location if necessary
    $nline = 0 if ( $i_opening < $ri_start->[$nline] );

    # find the correct line
    if ( $i_opening <= $ri_last->[-1] ) {
        while ( $i_opening > $ri_last->[$nline] ) { $nline++; }
    }

    # Error - token index is out of bounds - shouldn't happen
    # A program bug has been introduced in one of the calling routines.
    # We better stop here.
    else {
        my $i_last_line = $ri_last->[-1];
        if (DEVEL_MODE) {
            Fault(<<EOM);
Program bug in call to lookup_opening_indentation - index out of range
 called with index i_opening=$i_opening  > $i_last_line = max index of last line
This batch has max index = $max_index_to_go,
EOM
        }
        $nline = $#{$ri_last};
    }

    $rindentation_list->[0] =
      $nline;    # save line number to start looking next call
    my $ibeg       = $ri_start->[$nline];
    my $offset     = token_sequence_length( $ibeg, $i_opening ) - 1;
    my $is_leading = ( $ibeg == $i_opening );
    return ( $rindentation_list->[ $nline + 1 ], $offset, $is_leading );
} ## end sub lookup_opening_indentation

sub terminal_type_i {

    #  returns type of last token on this line (terminal token), as follows:
    #  returns # for a full-line comment
    #  returns ' ' for a blank line
    #  otherwise returns final token type

    my ( $ibeg, $iend ) = @_;

    # Start at the end and work backwards
    my $i      = $iend;
    my $type_i = $types_to_go[$i];

    # Check for side comment
    if ( $type_i eq '#' ) {
        $i--;
        if ( $i < $ibeg ) {
            return wantarray ? ( $type_i, $ibeg ) : $type_i;
        }
        $type_i = $types_to_go[$i];
    }

    # Skip past a blank
    if ( $type_i eq 'b' ) {
        $i--;
        if ( $i < $ibeg ) {
            return wantarray ? ( $type_i, $ibeg ) : $type_i;
        }
        $type_i = $types_to_go[$i];
    }

    # Found it..make sure it is a BLOCK termination,
    # but hide a terminal } after sort/map/grep/eval/do because it is not
    # necessarily the end of the line.  (terminal.t)
    my $block_type = $block_type_to_go[$i];
    if (
        $type_i eq '}'
        && (  !$block_type
            || $is_sort_map_grep_eval_do{$block_type} )
      )
    {
        $type_i = 'b';
    }
    return wantarray ? ( $type_i, $i ) : $type_i;
} ## end sub terminal_type_i

sub pad_array_to_go {

    # To simplify coding in break_lists and set_bond_strengths, it helps to
    # create some extra blank tokens at the end of the arrays.  We also add
    # some undef's to help guard against using invalid data.
    my ($self) = @_;
    $K_to_go[ $max_index_to_go + 1 ]             = undef;
    $tokens_to_go[ $max_index_to_go + 1 ]        = EMPTY_STRING;
    $tokens_to_go[ $max_index_to_go + 2 ]        = EMPTY_STRING;
    $tokens_to_go[ $max_index_to_go + 3 ]        = undef;
    $types_to_go[ $max_index_to_go + 1 ]         = 'b';
    $types_to_go[ $max_index_to_go + 2 ]         = 'b';
    $types_to_go[ $max_index_to_go + 3 ]         = undef;
    $nesting_depth_to_go[ $max_index_to_go + 2 ] = undef;
    $nesting_depth_to_go[ $max_index_to_go + 1 ] =
      $nesting_depth_to_go[$max_index_to_go];

    #    /^[R\}\)\]]$/
    if ( $is_closing_type{ $types_to_go[$max_index_to_go] } ) {
        if ( $nesting_depth_to_go[$max_index_to_go] <= 0 ) {

            # Nesting depths are set to be >=0 in sub write_line, so it should
            # not be possible to get here unless the code has a bracing error
            # which leaves a closing brace with zero nesting depth.
            if ( !get_saw_brace_error() ) {
                if (DEVEL_MODE) {
                    Fault(<<EOM);
Program bug in pad_array_to_go: hit nesting error which should have been caught
EOM
                }
            }
        }
        else {
            $nesting_depth_to_go[ $max_index_to_go + 1 ] -= 1;
        }
    }

    #       /^[L\{\(\[]$/
    elsif ( $is_opening_type{ $types_to_go[$max_index_to_go] } ) {
        $nesting_depth_to_go[ $max_index_to_go + 1 ] += 1;
    }
    else {
        ## must be ? or :
    }
    return;
} ## end sub pad_array_to_go

sub break_all_chain_tokens {

    # scan the current breakpoints looking for breaks at certain "chain
    # operators" (. : && || + etc) which often occur repeatedly in a long
    # statement.  If we see a break at any one, break at all similar tokens
    # within the same container.
    #
    my ( $self, $ri_left, $ri_right ) = @_;

    my %saw_chain_type;
    my %left_chain_type;
    my %right_chain_type;
    my %interior_chain_type;
    my $nmax = @{$ri_right} - 1;

    # scan the left and right end tokens of all lines
    my $count = 0;
    for my $n ( 0 .. $nmax ) {
        my $il    = $ri_left->[$n];
        my $ir    = $ri_right->[$n];
        my $typel = $types_to_go[$il];
        my $typer = $types_to_go[$ir];
        $typel = '+' if ( $typel eq '-' );    # treat + and - the same
        $typer = '+' if ( $typer eq '-' );
        $typel = '*' if ( $typel eq '/' );    # treat * and / the same
        $typer = '*' if ( $typer eq '/' );

        my $keyl = $typel eq 'k' ? $tokens_to_go[$il] : $typel;
        my $keyr = $typer eq 'k' ? $tokens_to_go[$ir] : $typer;
        if ( $is_chain_operator{$keyl} && $want_break_before{$typel} ) {
            next if ( $typel eq '?' );
            push @{ $left_chain_type{$keyl} }, $il;
            $saw_chain_type{$keyl} = 1;
            $count++;
        }
        if ( $is_chain_operator{$keyr} && !$want_break_before{$typer} ) {
            next if ( $typer eq '?' );
            push @{ $right_chain_type{$keyr} }, $ir;
            $saw_chain_type{$keyr} = 1;
            $count++;
        }
    }
    return unless $count;

    # now look for any interior tokens of the same types
    $count = 0;
    my $has_interior_dot_or_plus;
    for my $n ( 0 .. $nmax ) {
        my $il = $ri_left->[$n];
        my $ir = $ri_right->[$n];
        foreach my $i ( $il + 1 .. $ir - 1 ) {
            my $type = $types_to_go[$i];
            my $key  = $type eq 'k' ? $tokens_to_go[$i] : $type;
            $key = '+' if ( $key eq '-' );
            $key = '*' if ( $key eq '/' );
            if ( $saw_chain_type{$key} ) {
                push @{ $interior_chain_type{$key} }, $i;
                $count++;
                $has_interior_dot_or_plus ||= ( $key eq '.' || $key eq '+' );
            }
        }
    }
    return unless $count;

    my @keys = keys %saw_chain_type;

    # quit if just ONE continuation line with leading .  For example--
    # print LATEXFILE '\framebox{\parbox[c][' . $h . '][t]{' . $w . '}{'
    #  . $contents;
    # Fixed for b1399.
    if ( $has_interior_dot_or_plus && $nmax == 1 && @keys == 1 ) {
        return;
    }

    # now make a list of all new break points
    my @insert_list;

    # loop over all chain types
    foreach my $key (@keys) {

        # loop over all interior chain tokens
        foreach my $itest ( @{ $interior_chain_type{$key} } ) {

            # loop over all left end tokens of same type
            if ( $left_chain_type{$key} ) {
                next if $nobreak_to_go[ $itest - 1 ];
                foreach my $i ( @{ $left_chain_type{$key} } ) {
                    next unless $self->in_same_container_i( $i, $itest );
                    push @insert_list, $itest - 1;

                    # Break at matching ? if this : is at a different level.
                    # For example, the ? before $THRf_DEAD in the following
                    # should get a break if its : gets a break.
                    #
                    # my $flags =
                    #     ( $_ & 1 ) ? ( $_ & 4 ) ? $THRf_DEAD : $THRf_ZOMBIE
                    #   : ( $_ & 4 ) ? $THRf_R_DETACHED
                    #   :              $THRf_R_JOINABLE;
                    if (   $key eq ':'
                        && $levels_to_go[$i] != $levels_to_go[$itest] )
                    {
                        my $i_question = $mate_index_to_go[$itest];
                        if ( defined($i_question) && $i_question > 0 ) {
                            push @insert_list, $i_question - 1;
                        }
                    }
                    last;
                }
            }

            # loop over all right end tokens of same type
            if ( $right_chain_type{$key} ) {
                next if $nobreak_to_go[$itest];
                foreach my $i ( @{ $right_chain_type{$key} } ) {
                    next unless $self->in_same_container_i( $i, $itest );
                    push @insert_list, $itest;

                    # break at matching ? if this : is at a different level
                    if (   $key eq ':'
                        && $levels_to_go[$i] != $levels_to_go[$itest] )
                    {
                        my $i_question = $mate_index_to_go[$itest];
                        if ( defined($i_question) ) {
                            push @insert_list, $i_question;
                        }
                    }
                    last;
                }
            }
        }
    }

    # insert any new break points
    if (@insert_list) {
        $self->insert_additional_breaks( \@insert_list, $ri_left, $ri_right );
    }
    return;
} ## end sub break_all_chain_tokens

sub insert_additional_breaks {

    # this routine will add line breaks at requested locations after
    # sub break_long_lines has made preliminary breaks.

    my ( $self, $ri_break_list, $ri_first, $ri_last ) = @_;
    my $i_f;
    my $i_l;
    my $line_number = 0;
    foreach my $i_break_left ( sort { $a <=> $b } @{$ri_break_list} ) {

        next if ( $nobreak_to_go[$i_break_left] );

        $i_f = $ri_first->[$line_number];
        $i_l = $ri_last->[$line_number];
        while ( $i_break_left >= $i_l ) {
            $line_number++;

            # shouldn't happen unless caller passes bad indexes
            if ( $line_number >= @{$ri_last} ) {
                if (DEVEL_MODE) {
                    Fault(<<EOM);
Non-fatal program bug: couldn't set break at $i_break_left
EOM
                }
                return;
            }
            $i_f = $ri_first->[$line_number];
            $i_l = $ri_last->[$line_number];
        }

        # Do not leave a blank at the end of a line; back up if necessary
        if ( $types_to_go[$i_break_left] eq 'b' ) { $i_break_left-- }

        my $i_break_right = $inext_to_go[$i_break_left];
        if (   $i_break_left >= $i_f
            && $i_break_left < $i_l
            && $i_break_right > $i_f
            && $i_break_right <= $i_l )
        {
            splice( @{$ri_first}, $line_number, 1, ( $i_f, $i_break_right ) );
            splice( @{$ri_last},  $line_number, 1, ( $i_break_left, $i_l ) );
        }
    }
    return;
} ## end sub insert_additional_breaks

{    ## begin closure in_same_container_i
    my $ris_break_token;
    my $ris_comma_token;

    BEGIN {

        # all cases break on seeing commas at same level
        my @q = qw( => );
        push @q, ',';
        @{$ris_comma_token}{@q} = (1) x scalar(@q);

        # Non-ternary text also breaks on seeing any of qw(? : || or )
        # Example: we would not want to break at any of these .'s
        #  : "<A HREF=\"#item_" . htmlify( 0, $s2 ) . "\">$str</A>"
        push @q, qw( or || ? : );
        @{$ris_break_token}{@q} = (1) x scalar(@q);
    } ## end BEGIN

    sub in_same_container_i {

        # Check to see if tokens at i1 and i2 are in the same container, and
        # not separated by certain characters: => , ? : || or
        # This is an interface between the _to_go arrays to the rLL array
        my ( $self, $i1, $i2 ) = @_;

        # quick check
        my $parent_seqno_1 = $parent_seqno_to_go[$i1];
        return if ( $parent_seqno_to_go[$i2] ne $parent_seqno_1 );

        if ( $i2 < $i1 ) { ( $i1, $i2 ) = ( $i2, $i1 ) }
        my $K1  = $K_to_go[$i1];
        my $K2  = $K_to_go[$i2];
        my $rLL = $self->[_rLL_];

        my $depth_1 = $nesting_depth_to_go[$i1];
        return if ( $depth_1 < 0 );

        # Shouldn't happen since i1 and i2 have same parent:
        return unless ( $nesting_depth_to_go[$i2] == $depth_1 );

        # Select character set to scan for
        my $type_1 = $types_to_go[$i1];
        my $rbreak = ( $type_1 ne ':' ) ? $ris_break_token : $ris_comma_token;

        # Fast preliminary loop to verify that tokens are in the same container
        my $KK = $K1;
        while (1) {
            $KK = $rLL->[$KK]->[_KNEXT_SEQ_ITEM_];
            last if !defined($KK);
            last if ( $KK >= $K2 );
            my $ii      = $i1 + $KK - $K1;
            my $depth_i = $nesting_depth_to_go[$ii];
            return if ( $depth_i < $depth_1 );
            next   if ( $depth_i > $depth_1 );
            if ( $type_1 ne ':' ) {
                my $tok_i = $tokens_to_go[$ii];
                return if ( $tok_i eq '?' || $tok_i eq ':' );
            }
        }

        # Slow loop checking for certain characters

        #-----------------------------------------------------
        # This is potentially a slow routine and not critical.
        # For safety just give up for large differences.
        # See test file 'infinite_loop.txt'
        #-----------------------------------------------------
        return if ( $i2 - $i1 > 200 );

        foreach my $ii ( $i1 + 1 .. $i2 - 1 ) {

            my $depth_i = $nesting_depth_to_go[$ii];
            next   if ( $depth_i > $depth_1 );
            return if ( $depth_i < $depth_1 );
            my $tok_i = $tokens_to_go[$ii];
            return if ( $rbreak->{$tok_i} );
        }
        return 1;
    } ## end sub in_same_container_i
} ## end closure in_same_container_i

sub break_equals {

    # Look for assignment operators that could use a breakpoint.
    # For example, in the following snippet
    #
    #    $HOME = $ENV{HOME}
    #      || $ENV{LOGDIR}
    #      || $pw[7]
    #      || die "no home directory for user $<";
    #
    # we could break at the = to get this, which is a little nicer:
    #    $HOME =
    #         $ENV{HOME}
    #      || $ENV{LOGDIR}
    #      || $pw[7]
    #      || die "no home directory for user $<";
    #
    # The logic here follows the logic in set_logical_padding, which
    # will add the padding in the second line to improve alignment.
    #
    my ( $self, $ri_left, $ri_right ) = @_;
    my $nmax = @{$ri_right} - 1;
    return if ( $nmax < 2 );

    # scan the left ends of first two lines
    my $tokbeg = EMPTY_STRING;
    my $depth_beg;
    for my $n ( 1 .. 2 ) {
        my $il     = $ri_left->[$n];
        my $typel  = $types_to_go[$il];
        my $tokenl = $tokens_to_go[$il];
        my $keyl   = $typel eq 'k' ? $tokenl : $typel;

        my $has_leading_op = $is_chain_operator{$keyl};
        return unless ($has_leading_op);
        if ( $n > 1 ) {
            return
              unless ( $tokenl eq $tokbeg
                && $nesting_depth_to_go[$il] eq $depth_beg );
        }
        $tokbeg    = $tokenl;
        $depth_beg = $nesting_depth_to_go[$il];
    }

    # now look for any interior tokens of the same types
    my $il = $ri_left->[0];
    my $ir = $ri_right->[0];

    # now make a list of all new break points
    my @insert_list;
    foreach my $i ( reverse( $il + 1 .. $ir - 1 ) ) {
        my $type = $types_to_go[$i];
        if (   $is_assignment{$type}
            && $nesting_depth_to_go[$i] eq $depth_beg )
        {
            if ( $want_break_before{$type} ) {
                push @insert_list, $i - 1;
            }
            else {
                push @insert_list, $i;
            }
        }
    }

    # Break after a 'return' followed by a chain of operators
    #  return ( $^O !~ /win32|dos/i )
    #    && ( $^O ne 'VMS' )
    #    && ( $^O ne 'OS2' )
    #    && ( $^O ne 'MacOS' );
    # To give:
    #  return
    #       ( $^O !~ /win32|dos/i )
    #    && ( $^O ne 'VMS' )
    #    && ( $^O ne 'OS2' )
    #    && ( $^O ne 'MacOS' );
    my $i = 0;
    if (   $types_to_go[$i] eq 'k'
        && $tokens_to_go[$i] eq 'return'
        && $ir > $il
        && $nesting_depth_to_go[$i] eq $depth_beg )
    {
        push @insert_list, $i;
    }

    return unless (@insert_list);

    # One final check...
    # scan second and third lines and be sure there are no assignments
    # we want to avoid breaking at an = to make something like this:
    #    unless ( $icon =
    #           $html_icons{"$type-$state"}
    #        or $icon = $html_icons{$type}
    #        or $icon = $html_icons{$state} )
    for my $n ( 1 .. 2 ) {
        my $il_n = $ri_left->[$n];
        my $ir_n = $ri_right->[$n];
        foreach my $i ( $il_n + 1 .. $ir_n ) {
            my $type = $types_to_go[$i];
            return
              if ( $is_assignment{$type}
                && $nesting_depth_to_go[$i] eq $depth_beg );
        }
    }

    # ok, insert any new break point
    if (@insert_list) {
        $self->insert_additional_breaks( \@insert_list, $ri_left, $ri_right );
    }
    return;
} ## end sub break_equals

{    ## begin closure recombine_breakpoints

    # This routine is called once per batch to see if it would be better
    # to combine some of the lines into which the batch has been broken.

    my %is_amp_amp;
    my %is_math_op;
    my %is_plus_minus;
    my %is_mult_div;

    BEGIN {

        my @q;
        @q = qw( && || );
        @is_amp_amp{@q} = (1) x scalar(@q);

        @q = qw( + - * / );
        @is_math_op{@q} = (1) x scalar(@q);

        @q = qw( + - );
        @is_plus_minus{@q} = (1) x scalar(@q);

        @q = qw( * / );
        @is_mult_div{@q} = (1) x scalar(@q);
    } ## end BEGIN

    sub Debug_dump_breakpoints {

        # Debug routine to dump current breakpoints...not normally called
        # We are given indexes to the current lines:
        # $ri_beg = ref to array of BEGinning indexes of each line
        # $ri_end = ref to array of ENDing indexes of each line
        my ( $self, $ri_beg, $ri_end, $msg ) = @_;
        print {*STDOUT} "----Dumping breakpoints from: $msg----\n";
        for my $n ( 0 .. @{$ri_end} - 1 ) {
            my $ibeg = $ri_beg->[$n];
            my $iend = $ri_end->[$n];
            my $text = EMPTY_STRING;
            foreach my $i ( $ibeg .. $iend ) {
                $text .= $tokens_to_go[$i];
            }
            print {*STDOUT} "$n ($ibeg:$iend) $text\n";
        }
        print {*STDOUT} "----\n";
        return;
    } ## end sub Debug_dump_breakpoints

    sub delete_one_line_semicolons {

        my ( $self, $ri_beg, $ri_end ) = @_;
        my $rLL                 = $self->[_rLL_];
        my $K_opening_container = $self->[_K_opening_container_];

        # Walk down the lines of this batch and delete any semicolons
        # terminating one-line blocks;
        my $nmax = @{$ri_end} - 1;

        foreach my $n ( 0 .. $nmax ) {
            my $i_beg    = $ri_beg->[$n];
            my $i_e      = $ri_end->[$n];
            my $K_beg    = $K_to_go[$i_beg];
            my $K_e      = $K_to_go[$i_e];
            my $K_end    = $K_e;
            my $type_end = $rLL->[$K_end]->[_TYPE_];
            if ( $type_end eq '#' ) {
                $K_end = $self->K_previous_nonblank($K_end);
                if ( defined($K_end) ) { $type_end = $rLL->[$K_end]->[_TYPE_]; }
            }

            # we are looking for a line ending in closing brace
            next
              unless ( $type_end eq '}' && $rLL->[$K_end]->[_TOKEN_] eq '}' );

            # ...and preceded by a semicolon on the same line
            my $K_semicolon = $self->K_previous_nonblank($K_end);
            next unless defined($K_semicolon);
            my $i_semicolon = $i_beg + ( $K_semicolon - $K_beg );
            next if ( $i_semicolon <= $i_beg );
            next unless ( $rLL->[$K_semicolon]->[_TYPE_] eq ';' );

            # Safety check - shouldn't happen - not critical
            # This is not worth throwing a Fault, except in DEVEL_MODE
            if ( $types_to_go[$i_semicolon] ne ';' ) {
                DEVEL_MODE
                  && Fault("unexpected type looking for semicolon");
                next;
            }

            # ... with the corresponding opening brace on the same line
            my $type_sequence = $rLL->[$K_end]->[_TYPE_SEQUENCE_];
            my $K_opening     = $K_opening_container->{$type_sequence};
            next unless ( defined($K_opening) );
            my $i_opening = $i_beg + ( $K_opening - $K_beg );
            next if ( $i_opening < $i_beg );

            # ... and only one semicolon between these braces
            my $semicolon_count = 0;
            foreach my $K ( $K_opening + 1 .. $K_semicolon - 1 ) {
                if ( $rLL->[$K]->[_TYPE_] eq ';' ) {
                    $semicolon_count++;
                    last;
                }
            }
            next if ($semicolon_count);

            # ...ok, then make the semicolon invisible
            my $len = $token_lengths_to_go[$i_semicolon];
            $tokens_to_go[$i_semicolon]            = EMPTY_STRING;
            $token_lengths_to_go[$i_semicolon]     = 0;
            $rLL->[$K_semicolon]->[_TOKEN_]        = EMPTY_STRING;
            $rLL->[$K_semicolon]->[_TOKEN_LENGTH_] = 0;
            foreach ( $i_semicolon .. $max_index_to_go ) {
                $summed_lengths_to_go[ $_ + 1 ] -= $len;
            }
        }
        return;
    } ## end sub delete_one_line_semicolons

    use constant DEBUG_RECOMBINE => 0;

    sub recombine_breakpoints {

        my ( $self, $ri_beg, $ri_end, $rbond_strength_to_go ) = @_;

        # This sub implements the 'recombine' operation on a batch.
        # Its task is to combine some of these lines back together to
        # improve formatting.  The need for this arises because
        # sub 'break_long_lines' is very liberal in setting line breaks
        # for long lines, always setting breaks at good breakpoints, even
        # when that creates small lines.  Sometimes small line fragments
        # are produced which would look better if they were combined.

        # Input parameters:
        #  $ri_beg = ref to array of BEGinning indexes of each line
        #  $ri_end = ref to array of ENDing indexes of each line
        #  $rbond_strength_to_go = array of bond strengths pulling
        #    tokens together, used to decide where best to recombine lines.

        #-------------------------------------------------------------------
        # Do nothing under extreme stress; use <= 2 for c171.
        # (NOTE: New optimizations make this unnecessary.  But removing this
        # check is not really useful because this condition only occurs in
        # test runs, and another formatting pass will fix things anyway.)
        # This routine has a long history of improvements. Some past
        # relevant issues are : c118, c167, c171, c186, c187, c193, c200.
        #-------------------------------------------------------------------
        return if ( $high_stress_level <= 2 );

        my $nmax_start = @{$ri_end} - 1;
        return if ( $nmax_start <= 0 );

        my $iend_max = $ri_end->[$nmax_start];
        if ( $types_to_go[$iend_max] eq '#' ) {
            $iend_max = iprev_to_go($iend_max);
        }
        my $has_terminal_semicolon =
          $iend_max >= 0 && $types_to_go[$iend_max] eq ';';

        #--------------------------------------------------------------------
        # Break into the smallest possible sub-sections to improve efficiency
        #--------------------------------------------------------------------

        # Also make a list of all good joining tokens between the lines
        # n-1 and n.
        my @joint;

        my $rsections = [];
        my $nbeg_sec  = 0;
        my $nend_sec;
        my $nmax_section = 0;
        foreach my $nn ( 1 .. $nmax_start ) {
            my $ibeg_1 = $ri_beg->[ $nn - 1 ];
            my $iend_1 = $ri_end->[ $nn - 1 ];
            my $iend_2 = $ri_end->[$nn];
            my $ibeg_2 = $ri_beg->[$nn];

            # Define certain good joint tokens
            my ( $itok, $itokp, $itokm );
            foreach my $itest ( $iend_1, $ibeg_2 ) {
                my $type = $types_to_go[$itest];
                if (   $is_math_op{$type}
                    || $is_amp_amp{$type}
                    || $is_assignment{$type}
                    || $type eq ':' )
                {
                    $itok = $itest;
                }
            }

            # joint[$nn] = index of joint character
            $joint[$nn] = $itok;

            # Update the section list
            my $excess = $self->excess_line_length( $ibeg_1, $iend_2, 1 );
            if (
                $excess <= 1

                # The number 5 here is an arbitrary small number intended
                # to keep most small matches in one sub-section.
                || ( defined($nend_sec)
                    && ( $nn < 5 || $nmax_start - $nn < 5 ) )
              )
            {
                $nend_sec = $nn;
            }
            else {
                if ( defined($nend_sec) ) {
                    push @{$rsections}, [ $nbeg_sec, $nend_sec ];
                    my $num = $nend_sec - $nbeg_sec;
                    if ( $num > $nmax_section ) { $nmax_section = $num }
                    $nbeg_sec = $nn;
                    $nend_sec = undef;
                }
                $nbeg_sec = $nn;
            }
        }

        if ( defined($nend_sec) ) {
            push @{$rsections}, [ $nbeg_sec, $nend_sec ];
            my $num = $nend_sec - $nbeg_sec;
            if ( $num > $nmax_section ) { $nmax_section = $num }
        }

        my $num_sections = @{$rsections};

        if ( DEBUG_RECOMBINE > 1 ) {
            print {*STDOUT} <<EOM;
sections=$num_sections; nmax_sec=$nmax_section
EOM
        }

        if ( DEBUG_RECOMBINE > 0 ) {
            my $max = 0;
            print {*STDOUT}
              "-----\n$num_sections sections found for nmax=$nmax_start\n";
            foreach my $sect ( @{$rsections} ) {
                my ( $nbeg, $nend ) = @{$sect};
                my $num = $nend - $nbeg;
                if ( $num > $max ) { $max = $num }
                print {*STDOUT} "$nbeg $nend\n";
            }
            print {*STDOUT} "max size=$max of $nmax_start lines\n";
        }

        # Loop over all sub-sections.  Note that we have to work backwards
        # from the end of the batch since the sections use original line
        # numbers, and the line numbers change as we go.
        while ( my $section = pop @{$rsections} ) {
            my ( $nbeg, $nend ) = @{$section};
            $self->recombine_section_loop(
                {
                    _ri_beg                 => $ri_beg,
                    _ri_end                 => $ri_end,
                    _nbeg                   => $nbeg,
                    _nend                   => $nend,
                    _rjoint                 => \@joint,
                    _rbond_strength_to_go   => $rbond_strength_to_go,
                    _has_terminal_semicolon => $has_terminal_semicolon,
                }
            );
        }

        return;
    } ## end sub recombine_breakpoints

    sub recombine_section_loop {
        my ( $self, $rhash ) = @_;

        # Recombine breakpoints for one section of lines in the current batch

        # Given:
        #   $ri_beg, $ri_end = ref to arrays with token indexes of the first
        #     and last line
        #   $nbeg, $nend  = line numbers bounding this section
        #   $rjoint       = ref to array of good joining tokens per line

        # Update: $ri_beg, $ri_end, $rjoint if lines are joined

        # Returns:
        #   nothing

        #-------------
        # Definitions:
        #-------------
        # $rhash = {

        #   _ri_beg  = ref to array with starting token index by line
        #   _ri_end  = ref to array with ending token index by line
        #   _nbeg    = first line number of this section
        #   _nend    = last line number of this section
        #   _rjoint  = ref to array of good joining tokens for each line
        #   _rbond_strength_to_go   = array of bond strengths
        #   _has_terminal_semicolon = true if last line of batch has ';'

        #   _num_freeze      = fixed number of lines at end of this batch
        #   _optimization_on = true during final optimization loop
        #   _num_compares    = total number of line compares made so far
        #   _pair_list       = list of line pairs in optimal search order

        # };

        #-------------
        # How it works
        #-------------

        # We are working with a sequence of output lines and looking at
        # each pair. We must decide if it is better to join each of
        # these line pairs.

        # The brute force method is to loop through all line pairs and
        # join the best possible pair, as determined by either some
        # logical criterion or by the maximum 'bond strength' assigned
        # to the joining token.  Then keep doing this until there are
        # no remaining line pairs to join.

        # This works, but a problem is that it can theoretically take
        # on the order of N^2 comparisons in some pathological cases.
        # This can require an excessive amount of run time.

        # We can avoid excessive run time by conceptually dividing the
        # work into two phases. In the first phase we make any joints
        # required by user settings or logic other than the strength of
        # joints.  In the second phase we make any remaining joints
        # based on strengths.  To do this optimally, we do a preliminary
        # sort on joint strengths and always loop in that order.  That
        # way, we can stop a search on the first joint strength because
        # it will be the maximum.

        # This method is very fast, requiring no more than 3*N line
        # comparisons, where N is the number of lines (see below).

        my $ri_beg = $rhash->{_ri_beg};
        my $ri_end = $rhash->{_ri_end};

        # Line index range of this section:
        my $nbeg = $rhash->{_nbeg};    # stays constant
        my $nend = $rhash->{_nend};    # will decrease

        # $nmax_batch = starting number of lines in the full batch
        # $num_freeze = number of lines following this section to leave alone
        my $nmax_batch = @{$ri_end} - 1;
        $rhash->{_num_freeze} = $nmax_batch - $nend;

        # Setup the list of line pairs to test.  This stores the following
        # values for each line pair:
        #   [ $n=index of the second line of the pair, $bs=bond strength]
        my @pair_list;
        my $rbond_strength_to_go = $rhash->{_rbond_strength_to_go};
        foreach my $n ( $nbeg + 1 .. $nend ) {
            my $iend_1   = $ri_end->[ $n - 1 ];
            my $ibeg_2   = $ri_beg->[$n];
            my $bs_tweak = 0;
            if ( $is_amp_amp{ $types_to_go[$ibeg_2] } ) { $bs_tweak = 0.25 }
            my $bs = $rbond_strength_to_go->[$iend_1] + $bs_tweak;
            push @pair_list, [ $n, $bs ];
        }

        # Any order for testing is possible, but optimization is only possible
        # if we sort the line pairs on decreasing joint strength.
        @pair_list =
          sort { $b->[1] <=> $a->[1] || $a->[0] <=> $b->[0] } @pair_list;
        $rhash->{_rpair_list} = \@pair_list;

        #----------------
        # Iteration limit
        #----------------

        # This is now a very fast loop which runs in O(n) time, but a
        # check on total number of iterations is retained to guard
        # against future programming errors.

        # Most cases require roughly 1 comparison per line pair (1 full pass).
        # The upper bound is estimated to be about 3 comparisons per line pair
        # unless optimization is deactivated.  The approximate breakdown is:
        #   1 pass with 1 compare per joint to do any special cases, plus
        #   1 pass with up to 2 compares per joint in optimization mode
        # The most extreme cases in my collection are:
        #    camel1.t  - needs 2.7 compares per line (12 without optimization)
        #    ternary.t - needs 2.8 compares per line (12 without optimization)
        #    c206      - needs 3.3 compares per line, found with random testing
        # So a value of MAX_COMPARE_RATIO = 4 looks like an upper bound as
        # long as optimization is used.  A value of 20 should allow all code to
        # pass even if optimization is turned off for testing.
        use constant MAX_COMPARE_RATIO => DEVEL_MODE ? 4 : 20;

        my $num_pairs    = $nend - $nbeg + 1;
        my $max_compares = MAX_COMPARE_RATIO * $num_pairs;

        # Always start with optimization off
        $rhash->{_num_compares}    = 0;
        $rhash->{_optimization_on} = 0;
        $rhash->{_ix_best_last}    = 0;

        #--------------------------------------------
        # loop until there are no more recombinations
        #--------------------------------------------
        my $nmax_last = $nmax_batch + 1;
        while (1) {

            # Stop when the number of lines in the batch does not decrease
            $nmax_batch = @{$ri_end} - 1;
            if ( $nmax_batch >= $nmax_last ) {
                last;
            }
            $nmax_last = $nmax_batch;

            #-----------------------------------------
            # inner loop to find next best combination
            #-----------------------------------------
            $self->recombine_inner_loop($rhash);

            # Iteration limit check:
            if ( $rhash->{_num_compares} > $max_compares ) {

                # See note above; should only get here on a programming error
                if (DEVEL_MODE) {
                    my $ibeg = $ri_beg->[$nbeg];
                    my $Kbeg = $K_to_go[$ibeg];
                    my $lno  = $self->[_rLL_]->[$Kbeg]->[_LINE_INDEX_];
                    Fault(<<EOM);
inner loop passes =$rhash->{_num_compares} exceeds max=$max_compares, near line $lno
EOM
                }
                last;
            }

        } ## end iteration loop

        if (DEBUG_RECOMBINE) {
            my $ratio = sprintf "%0.3f", $rhash->{_num_compares} / $num_pairs;
            print {*STDOUT}
"exiting recombine_inner_loop with $nmax_last lines, opt=$rhash->{_optimization_on}, starting pairs=$num_pairs, num_compares=$rhash->{_num_compares}, ratio=$ratio\n";
        }

        return;
    } ## end sub recombine_section_loop

    sub recombine_inner_loop {
        my ( $self, $rhash ) = @_;

        # This is the inner loop of the recombine operation. We look at all of
        # the remaining joints in this section and select the best joint to be
        # recombined.  If a recombination is made, the number of lines
        # in this section will be reduced by one.

        # Returns: nothing

        my $rK_weld_right = $self->[_rK_weld_right_];
        my $rK_weld_left  = $self->[_rK_weld_left_];

        my $ri_beg               = $rhash->{_ri_beg};
        my $ri_end               = $rhash->{_ri_end};
        my $nbeg                 = $rhash->{_nbeg};
        my $rjoint               = $rhash->{_rjoint};
        my $rbond_strength_to_go = $rhash->{_rbond_strength_to_go};
        my $rpair_list           = $rhash->{_rpair_list};

        # This will remember the best joint:
        my $n_best  = 0;
        my $bs_best = 0.;
        my $ix_best = 0;
        my $num_bs  = 0;

        # The range of lines in this group is $nbeg to $nstop
        my $nmax       = @{$ri_end} - 1;
        my $nstop      = $nmax - $rhash->{_num_freeze};
        my $num_joints = $nstop - $nbeg;

        # Turn off optimization if just two joints remain to allow
        # special two-line logic to be checked (c193)
        if ( $rhash->{_optimization_on} && $num_joints <= 2 ) {
            $rhash->{_optimization_on} = 0;
        }

        # Start where we ended the last search
        my $ix_start = $rhash->{_ix_best_last};

        # Keep the starting index in bounds
        $ix_start = max( 0, $ix_start );

        # Make a search order list which cycles around to visit
        # all line pairs.
        my $ix_max  = @{$rpair_list} - 1;
        my @ix_list = ( $ix_start .. $ix_max, 0 .. $ix_start - 1 );
        my $ix_last = $ix_list[-1];

        #-------------------------
        # loop over all line pairs
        #-------------------------
        my $incomplete_loop;
        foreach my $ix (@ix_list) {
            my $item = $rpair_list->[$ix];
            my ( $n, $bs ) = @{$item};

            # This flag will be true if we 'last' out of this loop early.
            # We cannot turn on optimization if this is true.
            $incomplete_loop = $ix != $ix_last;

            # Update the count of the number of times through this inner loop
            $rhash->{_num_compares}++;

            #----------------------------------------------------------
            # If we join the current pair of lines,
            # line $n-1 will become the left part of the joined line
            # line $n will become the right part of the joined line
            #
            # Here are Indexes of the endpoint tokens of the two lines:
            #
            #  -----line $n-1--- | -----line $n-----
            #  $ibeg_1   $iend_1 | $ibeg_2   $iend_2
            #                    ^
            #                    |
            # We want to decide if we should remove the line break
            # between the tokens at $iend_1 and $ibeg_2
            #
            # We will apply a number of ad-hoc tests to see if joining
            # here will look ok.  The code will just move to the next
            # pair if the join doesn't look good.  If we get through
            # the gauntlet of tests, the lines will be recombined.
            #----------------------------------------------------------
            #
            # beginning and ending tokens of the lines we are working on
            my $ibeg_1 = $ri_beg->[ $n - 1 ];
            my $iend_1 = $ri_end->[ $n - 1 ];
            my $iend_2 = $ri_end->[$n];
            my $ibeg_2 = $ri_beg->[$n];

            # The combined line cannot be too long
            my $excess = $self->excess_line_length( $ibeg_1, $iend_2, 1 );
            next if ( $excess > 0 );

            my $type_iend_1 = $types_to_go[$iend_1];
            my $type_iend_2 = $types_to_go[$iend_2];
            my $type_ibeg_1 = $types_to_go[$ibeg_1];
            my $type_ibeg_2 = $types_to_go[$ibeg_2];

            DEBUG_RECOMBINE > 1 && do {
                print {*STDOUT}
"RECOMBINE: ix=$ix iend1=$iend_1 iend2=$iend_2 n=$n nmax=$nmax if=$ibeg_1 type=$type_ibeg_1 =$tokens_to_go[$ibeg_1] next_type=$type_ibeg_2 next_tok=$tokens_to_go[$ibeg_2]\n";
            };

            # If line $n is the last line, we set some flags and
            # do any special checks for it
            my $this_line_is_semicolon_terminated;
            if ( $n == $nmax ) {

                if ( $type_ibeg_2 eq '{' ) {

                    # join isolated ')' and '{' if requested (git #110)
                    if (   $rOpts_cuddled_paren_brace
                        && $type_iend_1 eq '}'
                        && $iend_1 == $ibeg_1
                        && $ibeg_2 == $iend_2 )
                    {
                        if (   $tokens_to_go[$iend_1] eq ')'
                            && $tokens_to_go[$ibeg_2] eq '{' )
                        {
                            $n_best  = $n;
                            $ix_best = $ix;
                            last;
                        }
                    }

                    # otherwise, a terminal '{' should stay where it is
                    # unless preceded by a fat comma
                    next if ( $type_iend_1 ne '=>' );
                }

                $this_line_is_semicolon_terminated =
                  $rhash->{_has_terminal_semicolon};

            }

            #----------------------------------------------------------
            # Recombine Section 0:
            # Examine the special token joining this line pair, if any.
            # Put as many tests in this section to avoid duplicate code
            # and to make formatting independent of whether breaks are
            # to the left or right of an operator.
            #----------------------------------------------------------

            my $itok = $rjoint->[$n];
            if ($itok) {
                my $ok_0 = recombine_section_0( $itok, $ri_beg, $ri_end, $n );
                next if ( !$ok_0 );
            }

            #----------------------------------------------------------
            # Recombine Section 1:
            # Join welded nested containers immediately
            #----------------------------------------------------------

            if (
                $total_weld_count
                && ( $type_sequence_to_go[$iend_1]
                    && defined( $rK_weld_right->{ $K_to_go[$iend_1] } )
                    || $type_sequence_to_go[$ibeg_2]
                    && defined( $rK_weld_left->{ $K_to_go[$ibeg_2] } ) )
              )
            {
                $n_best  = $n;
                $ix_best = $ix;
                last;
            }

            #----------------------------------------------------------
            # Recombine Section 2:
            # Examine token at $iend_1 (right end of first line of pair)
            #----------------------------------------------------------

            my ( $ok_2, $skip_Section_3 ) =
              recombine_section_2( $ri_beg, $ri_end, $n,
                $this_line_is_semicolon_terminated );
            next if ( !$ok_2 );

            #----------------------------------------------------------
            # Recombine Section 3:
            # Examine token at $ibeg_2 (left end of second line of pair)
            #----------------------------------------------------------

            # Join lines identified above as capable of
            # causing an outdented line with leading closing paren.
            # Note that we are skipping the rest of this section
            # and the rest of the loop to do the join.
            if ($skip_Section_3) {
                $forced_breakpoint_to_go[$iend_1] = 0;
                $n_best                           = $n;
                $ix_best                          = $ix;
                $incomplete_loop                  = 1;
                last;
            }

            my ( $ok_3, $bs_tweak ) =
              recombine_section_3( $ri_beg, $ri_end, $n,
                $this_line_is_semicolon_terminated );
            next if ( !$ok_3 );

            #----------------------------------------------------------
            # Recombine Section 4:
            # Combine the lines if we arrive here and it is possible
            #----------------------------------------------------------

            # honor hard breakpoints
            next if ( $forced_breakpoint_to_go[$iend_1] );

            if (DEVEL_MODE) {

                # This fault can only occur if an array index error has been
                # introduced by a recent programming change.
                my $bs_check = $rbond_strength_to_go->[$iend_1] + $bs_tweak;
                if ( $bs_check != $bs ) {
                    Fault(<<EOM);
bs=$bs != $bs_check for break after type $type_iend_1 ix=$ix n=$n
EOM
                }
            }

            # Require a few extra spaces before recombining lines if we
            # are at an old breakpoint unless this is a simple list or
            # terminal line.  The goal is to avoid oscillating between
            # two quasi-stable end states.  For example this snippet
            # caused problems:

##    my $this =
##    bless {
##        TText => "[" . ( join ',', map { "\"$_\"" } split "\n", $_ ) . "]"
##      },
##      $type;
            next
              if ( $old_breakpoint_to_go[$iend_1]
                && !$this_line_is_semicolon_terminated
                && $n < $nmax
                && $excess + 4 > 0
                && $type_iend_2 ne ',' );

            # do not recombine if we would skip in indentation levels
            if ( $n < $nmax ) {
                my $if_next = $ri_beg->[ $n + 1 ];
                next
                  if (
                       $levels_to_go[$ibeg_1] < $levels_to_go[$ibeg_2]
                    && $levels_to_go[$ibeg_2] < $levels_to_go[$if_next]

                    # but an isolated 'if (' is undesirable
                    && !(
                           $n == 1
                        && $iend_1 - $ibeg_1 <= 2
                        && $type_ibeg_1 eq 'k'
                        && $tokens_to_go[$ibeg_1] eq 'if'
                        && $tokens_to_go[$iend_1] ne '('
                    )
                  );
            }

            ## OLD: honor no-break's
            ## next if ( $bs >= NO_BREAK - 1 );  # removed for b1257

            # remember the pair with the greatest bond strength
            if ( !$n_best ) {

                # First good joint ...
                $n_best  = $n;
                $ix_best = $ix;
                $bs_best = $bs;
                $num_bs  = 1;

                # In optimization mode: stop on the first acceptable joint
                # because we already know it has the highest strength
                if ( $rhash->{_optimization_on} == 1 ) {
                    last;
                }
            }
            else {

                # Second and later joints ..
                $num_bs++;

                # save maximum strength; in case of a tie select min $n
                if ( $bs > $bs_best || $bs == $bs_best && $n < $n_best ) {
                    $n_best  = $n;
                    $ix_best = $ix;
                    $bs_best = $bs;
                }
            }

        } ## end loop over all line pairs

        #---------------------------------------------------
        # recombine the pair with the greatest bond strength
        #---------------------------------------------------
        if ($n_best) {
            DEBUG_RECOMBINE > 1
              && print "BEST: nb=$n_best nbeg=$nbeg stop=$nstop bs=$bs_best\n";
            splice @{$ri_beg}, $n_best,     1;
            splice @{$ri_end}, $n_best - 1, 1;
            splice @{$rjoint}, $n_best,     1;

            splice @{$rpair_list}, $ix_best, 1;

            # Update the line indexes in the pair list:
            # Old $n values greater than the best $n decrease by 1
            # because of the splice we just did.
            foreach my $item ( @{$rpair_list} ) {
                my $n_old = $item->[0];
                if ( $n_old > $n_best ) { $item->[0] -= 1 }
            }

            # Store the index of this location for starting the next search.
            # We must subtract 1 to get an updated index because the splice
            # above just removed the best pair.
            # BUT CAUTION: if this is the first pair in the pair list, then
            # this produces an invalid index. So this index must be tested
            # before use in the next pass through the outer loop.
            $rhash->{_ix_best_last} = $ix_best - 1;

            # Turn on optimization if ...
            if (

                # it is not already on, and
                !$rhash->{_optimization_on}

                # we have not taken a shortcut to get here, and
                && !$incomplete_loop

                # we have seen a good break on strength, and
                && $num_bs

              )
            {

                # To deactivate optimization for testing purposes, the next
                # line can be commented out. This will increase run time.
                $rhash->{_optimization_on} = 1;
                if (DEBUG_RECOMBINE) {
                    my $num_compares = $rhash->{_num_compares};
                    my $pair_count   = @ix_list;
                    print {*STDOUT}
"Entering optimization phase at $num_compares compares, pair count = $pair_count\n";
                }
            }
        }
        return;
    } ## end sub recombine_inner_loop

    sub recombine_section_0 {
        my ( $itok, $ri_beg, $ri_end, $n ) = @_;

        # Recombine Section 0:
        # Examine special candidate joining token $itok

        # Given:
        #  $itok = index of token at a possible join of lines $n-1 and $n

        # Return:
        #  true  => ok to combine
        #  false => do not combine lines

        # Here are Indexes of the endpoint tokens of the two lines:
        #
        #  -----line $n-1--- | -----line $n-----
        #  $ibeg_1   $iend_1 | $ibeg_2   $iend_2
        #              ^         ^
        #              |         |
        #              ------------$itok is one of these tokens

        # Put as many tests in this section to avoid duplicate code
        # and to make formatting independent of whether breaks are
        # to the left or right of an operator.

        my $nmax   = @{$ri_end} - 1;
        my $ibeg_1 = $ri_beg->[ $n - 1 ];
        my $iend_1 = $ri_end->[ $n - 1 ];
        my $ibeg_2 = $ri_beg->[$n];
        my $iend_2 = $ri_end->[$n];

        if ($itok) {

            my $type = $types_to_go[$itok];

            if ( $type eq ':' ) {

                # do not join at a colon unless it disobeys the
                # break request
                if ( $itok eq $iend_1 ) {
                    return unless $want_break_before{$type};
                }
                else {
                    return if $want_break_before{$type};
                }
            } ## end if ':'

            # handle math operators + - * /
            elsif ( $is_math_op{$type} ) {

                # Combine these lines if this line is a single
                # number, or if it is a short term with same
                # operator as the previous line.  For example, in
                # the following code we will combine all of the
                # short terms $A, $B, $C, $D, $E, $F, together
                # instead of leaving them one per line:
                #  my $time =
                #    $A * $B * $C * $D * $E * $F *
                #    ( 2. * $eps * $sigma * $area ) *
                #    ( 1. / $tcold**3 - 1. / $thot**3 );

                # This can be important in math-intensive code.

                my $good_combo;

                my $itokp  = min( $inext_to_go[$itok],  $iend_2 );
                my $itokpp = min( $inext_to_go[$itokp], $iend_2 );
                my $itokm  = max( iprev_to_go($itok),  $ibeg_1 );
                my $itokmm = max( iprev_to_go($itokm), $ibeg_1 );

                # check for a number on the right
                if ( $types_to_go[$itokp] eq 'n' ) {

                    # ok if nothing else on right
                    if ( $itokp == $iend_2 ) {
                        $good_combo = 1;
                    }
                    else {

                        # look one more token to right..
                        # okay if math operator or some termination
                        $good_combo =
                          ( ( $itokpp == $iend_2 )
                              && $is_math_op{ $types_to_go[$itokpp] } )
                          || $types_to_go[$itokpp] =~ /^[#,;]$/;
                    }
                }

                # check for a number on the left
                if ( !$good_combo && $types_to_go[$itokm] eq 'n' ) {

                    # okay if nothing else to left
                    if ( $itokm == $ibeg_1 ) {
                        $good_combo = 1;
                    }

                    # otherwise look one more token to left
                    else {

                        # okay if math operator, comma, or assignment
                        $good_combo = ( $itokmm == $ibeg_1 )
                          && ( $is_math_op{ $types_to_go[$itokmm] }
                            || $types_to_go[$itokmm] =~ /^[,]$/
                            || $is_assignment{ $types_to_go[$itokmm] } );
                    }
                }

                # look for a single short token either side of the
                # operator
                if ( !$good_combo ) {

                    # Slight adjustment factor to make results
                    # independent of break before or after operator
                    # in long summed lists.  (An operator and a
                    # space make two spaces).
                    my $two = ( $itok eq $iend_1 ) ? 2 : 0;

                    $good_combo =

                      # numbers or id's on both sides of this joint
                      $types_to_go[$itokp] =~ /^[in]$/
                      && $types_to_go[$itokm] =~ /^[in]$/

                      # one of the two lines must be short:
                      && (
                        (
                            # no more than 2 nonblank tokens right
                            # of joint
                            $itokpp == $iend_2

                            # short
                            && token_sequence_length( $itokp, $iend_2 ) <
                            $two + $rOpts_short_concatenation_item_length
                        )
                        || (
                            # no more than 2 nonblank tokens left of
                            # joint
                            $itokmm == $ibeg_1

                            # short
                            && token_sequence_length( $ibeg_1, $itokm ) <
                            2 - $two + $rOpts_short_concatenation_item_length
                        )

                      )

                      # keep pure terms; don't mix +- with */
                      && !(
                        $is_plus_minus{$type}
                        && (   $is_mult_div{ $types_to_go[$itokmm] }
                            || $is_mult_div{ $types_to_go[$itokpp] } )
                      )
                      && !(
                        $is_mult_div{$type}
                        && (   $is_plus_minus{ $types_to_go[$itokmm] }
                            || $is_plus_minus{ $types_to_go[$itokpp] } )
                      )

                      ;
                }

                # it is also good to combine if we can reduce to 2
                # lines
                if ( !$good_combo ) {

                    # index on other line where same token would be
                    # in a long chain.
                    my $iother = ( $itok == $iend_1 ) ? $iend_2 : $ibeg_1;

                    $good_combo =
                         $n == 2
                      && $n == $nmax
                      && $types_to_go[$iother] ne $type;
                }

                return unless ($good_combo);

            } ## end math

            elsif ( $is_amp_amp{$type} ) {
                ##TBD
            } ## end &&, ||

            elsif ( $is_assignment{$type} ) {
                ##TBD
            }
            else {
                ## ok - not a special type
            }
            ## end assignment
        }

        # ok to combine lines
        return 1;
    } ## end sub recombine_section_0

    sub recombine_section_2 {

        my ( $ri_beg, $ri_end, $n, $this_line_is_semicolon_terminated ) = @_;

        # Recombine Section 2:
        # Examine token at $iend_1 (right end of first line of pair)

        # Here are Indexes of the endpoint tokens of the two lines:
        #
        #  -----line $n-1--- | -----line $n-----
        #  $ibeg_1   $iend_1 | $ibeg_2   $iend_2
        #              ^
        #              |
        #              -----Section 2 looks at this token

        # Returns:
        #   (nothing)         => do not join lines
        #   1, skip_Section_3 => ok to join lines

        # $skip_Section_3 is a flag for skipping the next section
        my $skip_Section_3 = 0;

        my $nmax      = @{$ri_end} - 1;
        my $ibeg_1    = $ri_beg->[ $n - 1 ];
        my $iend_1    = $ri_end->[ $n - 1 ];
        my $iend_2    = $ri_end->[$n];
        my $ibeg_2    = $ri_beg->[$n];
        my $ibeg_3    = $n < $nmax ? $ri_beg->[ $n + 1 ] : -1;
        my $ibeg_nmax = $ri_beg->[$nmax];

        my $type_iend_1 = $types_to_go[$iend_1];
        my $type_iend_2 = $types_to_go[$iend_2];
        my $type_ibeg_1 = $types_to_go[$ibeg_1];
        my $type_ibeg_2 = $types_to_go[$ibeg_2];

        # an isolated '}' may join with a ';' terminated segment
        if ( $type_iend_1 eq '}' ) {

            # Check for cases where combining a semicolon terminated
            # statement with a previous isolated closing paren will
            # allow the combined line to be outdented.  This is
            # generally a good move.  For example, we can join up
            # the last two lines here:
            #  (
            #      $dev,  $ino,   $mode,  $nlink, $uid,     $gid, $rdev,
            #      $size, $atime, $mtime, $ctime, $blksize, $blocks
            #    )
            #    = stat($file);
            #
            # to get:
            #  (
            #      $dev,  $ino,   $mode,  $nlink, $uid,     $gid, $rdev,
            #      $size, $atime, $mtime, $ctime, $blksize, $blocks
            #  ) = stat($file);
            #
            # which makes the parens line up.
            #
            # Another example, from Joe Matarazzo, probably looks best
            # with the 'or' clause appended to the trailing paren:
            #  $self->some_method(
            #      PARAM1 => 'foo',
            #      PARAM2 => 'bar'
            #  ) or die "Some_method didn't work";
            #
            # But we do not want to do this for something like the -lp
            # option where the paren is not outdentable because the
            # trailing clause will be far to the right.
            #
            # The logic here is synchronized with the logic in sub
            # sub get_final_indentation, which actually does
            # the outdenting.
            #
            my $combine_ok = $this_line_is_semicolon_terminated

              # only one token on last line
              && $ibeg_1 == $iend_1

              # must be structural paren
              && $tokens_to_go[$iend_1] eq ')'

              # style must allow outdenting,
              && !$closing_token_indentation{')'}

              # but leading colons probably line up with a
              # previous colon or question (count could be wrong).
              && $type_ibeg_2 ne ':'

              # only one step in depth allowed.  this line must not
              # begin with a ')' itself.
              && ( $nesting_depth_to_go[$iend_1] ==
                $nesting_depth_to_go[$iend_2] + 1 );

            # But only combine leading '&&', '||', if no previous && || :
            # seen. This count includes these tokens at all levels.  The
            # idea is that seeing these at any level can make it hard to read
            # formatting if we recombine.
            if ( $is_amp_amp{$type_ibeg_2} ) {
                foreach my $n_t ( reverse( 0 .. $n - 2 ) ) {
                    my $ibeg_t = $ri_beg->[$n_t];
                    my $type_t = $types_to_go[$ibeg_t];
                    if ( $is_amp_amp{$type_t} || $type_t eq ':' ) {
                        $combine_ok = 0;
                        last;
                    }
                }
            }

            $skip_Section_3 ||= $combine_ok;

            # YVES patch 2 of 2:
            # Allow cuddled eval chains, like this:
            #   eval {
            #       #STUFF;
            #       1; # return true
            #   } or do {
            #       #handle error
            #   };
            # This patch works together with a patch in
            # setting adjusted indentation (where the closing eval
            # brace is outdented if possible).
            # The problem is that an 'eval' block has continuation
            # indentation and it looks better to undo it in some
            # cases.  If we do not use this patch we would get:
            #   eval {
            #       #STUFF;
            #       1; # return true
            #       }
            #       or do {
            #       #handle error
            #     };
            # The alternative, for uncuddled style, is to create
            # a patch in get_final_indentation which undoes
            # the indentation of a leading line like 'or do {'.
            # This doesn't work well with -icb through
            if (
                   $block_type_to_go[$iend_1]
                && $rOpts_brace_follower_vertical_tightness > 0
                && (

                    # -bfvt=1, allow cuddled eval chains [default]
                    (
                           $tokens_to_go[$iend_2] eq '{'
                        && $block_type_to_go[$iend_1] eq 'eval'
                        && !ref( $leading_spaces_to_go[$iend_1] )
                        && !$rOpts_indent_closing_brace
                    )

                    # -bfvt=2, allow most brace followers [part of git #110]
                    || (   $rOpts_brace_follower_vertical_tightness > 1
                        && $ibeg_1 == $iend_1 )

                )

                && (
                    ( $type_ibeg_2 =~ /^(\&\&|\|\|)$/ )
                    || (   $type_ibeg_2 eq 'k'
                        && $is_and_or{ $tokens_to_go[$ibeg_2] } )
                    || $is_if_unless{ $tokens_to_go[$ibeg_2] }
                )
              )
            {
                $skip_Section_3 ||= 1;
            }

            return
              unless (
                $skip_Section_3

                # handle '.' and '?' specially below
                || ( $type_ibeg_2 =~ /^[\.\?]$/ )

                # fix for c054 (unusual -pbp case)
                || $type_ibeg_2 eq '=='

              );
        }

        elsif ( $type_iend_1 eq '{' ) {

            # YVES
            # honor breaks at opening brace
            # Added to prevent recombining something like this:
            #  } || eval { package main;
            return if ( $forced_breakpoint_to_go[$iend_1] );
        }

        # do not recombine lines with ending &&, ||,
        elsif ( $is_amp_amp{$type_iend_1} ) {
            return unless ( $want_break_before{$type_iend_1} );
        }

        # Identify and recombine a broken ?/: chain
        elsif ( $type_iend_1 eq '?' ) {

            # Do not recombine different levels
            return
              if ( $levels_to_go[$ibeg_1] ne $levels_to_go[$ibeg_2] );

            # do not recombine unless next line ends in :
            return unless $type_iend_2 eq ':';
        }

        # for lines ending in a comma...
        elsif ( $type_iend_1 eq ',' ) {

            # Do not recombine at comma which is following the
            # input bias.
            # NOTE: this could be controlled by a special flag,
            # but it seems to work okay.
            return if ( $old_breakpoint_to_go[$iend_1] );

            # An isolated '},' may join with an identifier + ';'
            # This is useful for the class of a 'bless' statement
            # (bless.t)
            if (   $type_ibeg_1 eq '}'
                && $type_ibeg_2 eq 'i' )
            {
                return
                  unless ( ( $ibeg_1 == ( $iend_1 - 1 ) )
                    && ( $iend_2 == ( $ibeg_2 + 1 ) )
                    && $this_line_is_semicolon_terminated );

                # override breakpoint
                $forced_breakpoint_to_go[$iend_1] = 0;
            }

            # but otherwise ..
            else {

                # do not recombine after a comma unless this will
                # leave just 1 more line
                return if ( $n + 1 < $nmax );

                # do not recombine if there is a change in
                # indentation depth
                return
                  if ( $levels_to_go[$iend_1] != $levels_to_go[$iend_2] );

                # do not recombine a "complex expression" after a
                # comma.  "complex" means no parens.
                my $saw_paren;
                foreach my $ii ( $ibeg_2 .. $iend_2 ) {
                    if ( $tokens_to_go[$ii] eq '(' ) {
                        $saw_paren = 1;
                        last;
                    }
                }
                return if $saw_paren;
            }
        }

        # opening paren..
        elsif ( $type_iend_1 eq '(' ) {

            # No longer doing this
        }

        elsif ( $type_iend_1 eq ')' ) {

            # No longer doing this
        }

        # keep a terminal for-semicolon
        elsif ( $type_iend_1 eq 'f' ) {
            return;
        }

        # if '=' at end of line ...
        elsif ( $is_assignment{$type_iend_1} ) {

            # keep break after = if it was in input stream
            # this helps prevent 'blinkers'
            return
              if (
                $old_breakpoint_to_go[$iend_1]

                # don't strand an isolated '='
                && $iend_1 != $ibeg_1
              );

            my $is_short_quote =
              (      $type_ibeg_2 eq 'Q'
                  && $ibeg_2 == $iend_2
                  && token_sequence_length( $ibeg_2, $ibeg_2 ) <
                  $rOpts_short_concatenation_item_length );
            my $is_ternary = (
                $type_ibeg_1 eq '?' && ( $ibeg_3 >= 0
                    && $types_to_go[$ibeg_3] eq ':' )
            );

            # always join an isolated '=', a short quote, or if this
            # will put ?/: at start of adjacent lines
            if (   $ibeg_1 != $iend_1
                && !$is_short_quote
                && !$is_ternary )
            {
                my $combine_ok = (
                    (

                        # unless we can reduce this to two lines
                        $nmax < $n + 2

                          # or three lines, the last with a leading
                          # semicolon
                          || ( $nmax == $n + 2
                            && $types_to_go[$ibeg_nmax] eq ';' )

                          # or the next line ends with a here doc
                          || $type_iend_2 eq 'h'

                          # or the next line ends in an open paren or
                          # brace and the break hasn't been forced
                          # [dima.t]
                          || (!$forced_breakpoint_to_go[$iend_1]
                            && $type_iend_2 eq '{' )
                    )

                      # do not recombine if the two lines might align
                      # well this is a very approximate test for this
                      && (

                        # RT#127633 - the leading tokens are not
                        # operators
                        ( $type_ibeg_2 ne $tokens_to_go[$ibeg_2] )

                        # or they are different
                        || (   $ibeg_3 >= 0
                            && $type_ibeg_2 ne $types_to_go[$ibeg_3] )
                      )
                );

                return if ( !$combine_ok );

                if (

                    # Recombine if we can make two lines
                    $nmax >= $n + 2

                    # -lp users often prefer this:
                    #  my $title = function($env, $env, $sysarea,
                    #                       "bubba Borrower Entry");
                    #  so we will recombine if -lp is used we have
                    #  ending comma
                    && !(
                           $ibeg_3 > 0
                        && ref( $leading_spaces_to_go[$ibeg_3] )
                        && $type_iend_2 eq ','
                    )
                  )
                {

                    # otherwise, scan the rhs line up to last token for
                    # complexity.  Note that we are not counting the last token
                    # in case it is an opening paren.
                    my $ok = simple_rhs( $ri_end, $n, $nmax, $ibeg_2, $iend_2 );
                    return if ( !$ok );

                }
            }

            if ( $tokens_to_go[$ibeg_2] !~ /^[\{\(\[]$/ ) {
                $forced_breakpoint_to_go[$iend_1] = 0;
            }
        }

        # for keywords..
        elsif ( $type_iend_1 eq 'k' ) {

            # make major control keywords stand out
            # (recombine.t)
            return
              if (

                #/^(last|next|redo|return)$/
                $is_last_next_redo_return{ $tokens_to_go[$iend_1] }

                # but only if followed by multiple lines
                && $n < $nmax
              );

            if ( $is_and_or{ $tokens_to_go[$iend_1] } ) {
                return
                  unless $want_break_before{ $tokens_to_go[$iend_1] };
            }
        }
        elsif ( $type_iend_1 eq '.' ) {

            # NOTE: the logic here should match that of section 3 so that
            # line breaks are independent of choice of break before or after.
            # It would be nice to combine them in section 0, but the
            # special junction case ') .' makes that difficult.
            # This section added to fix issues c172, c174.
            my $i_next_nonblank = $ibeg_2;
            my $summed_len_1    = $summed_lengths_to_go[ $iend_1 + 1 ] -
              $summed_lengths_to_go[$ibeg_1];
            my $summed_len_2 = $summed_lengths_to_go[ $iend_2 + 1 ] -
              $summed_lengths_to_go[$ibeg_2];
            my $iend_1_minus = max( $ibeg_1, iprev_to_go($iend_1) );

            my $combine_ok = (

                # ... unless there is just one and we can reduce
                # this to two lines if we do.  For example, this
                #
                #
                #  $bodyA .=
                #    '($dummy, $pat) = &get_next_tex_cmd;' . '$args .= $pat;'
                #
                #  looks better than this:
                #  $bodyA .= '($dummy, $pat) = &get_next_tex_cmd;' .
                #    '$args .= $pat;'

                # check for 2 lines, not in a long broken '.' chain
                ( $n == 2 && $n == $nmax && $type_iend_1 ne $type_iend_2 )

                  # ... or this would strand a short quote , like this
                  #                "some long quote" .
                  #                "\n";
                  || (
                       $types_to_go[$i_next_nonblank] eq 'Q'
                    && $i_next_nonblank >= $iend_2 - 2
                    && $token_lengths_to_go[$i_next_nonblank] <
                    $rOpts_short_concatenation_item_length

                    #  additional constraints to fix c167
                    && (   $types_to_go[$iend_1_minus] ne 'Q'
                        || $summed_len_2 < $summed_len_1 )
                  )
            );
            return if ( !$combine_ok );
        }
        else {
            ## ok - not a special type
        }
        return ( 1, $skip_Section_3 );
    } ## end sub recombine_section_2

    sub simple_rhs {

        my ( $ri_end, $n, $nmax, $ibeg_2, $iend_2 ) = @_;

        # Scan line ibeg_2 to $iend_2 up to last token for complexity.
        # We are not counting the last token in case it is an opening paren.
        # Return:
        #   true  if rhs is simple, ok to recombine
        #   false otherwise

        my $tv    = 0;
        my $depth = $nesting_depth_to_go[$ibeg_2];
        foreach my $i ( $ibeg_2 + 1 .. $iend_2 - 1 ) {
            if ( $nesting_depth_to_go[$i] != $depth ) {
                $tv++;
                last if ( $tv > 1 );
            }
            $depth = $nesting_depth_to_go[$i];
        }

        # ok to recombine if no level changes before
        # last token
        if ( $tv > 0 ) {

            # otherwise, do not recombine if more than
            # two level changes.
            return if ( $tv > 1 );

            # check total complexity of the two
            # adjacent lines that will occur if we do
            # this join
            my $istop =
              ( $n < $nmax )
              ? $ri_end->[ $n + 1 ]
              : $iend_2;
            foreach my $i ( $iend_2 .. $istop ) {
                if ( $nesting_depth_to_go[$i] != $depth ) {
                    $tv++;
                    last if ( $tv > 2 );
                }
                $depth = $nesting_depth_to_go[$i];
            }

            # do not recombine if total is more than 2
            # level changes
            return if ( $tv > 2 );
        }
        return 1;
    } ## end sub simple_rhs

    sub recombine_section_3 {

        my ( $ri_beg, $ri_end, $n, $this_line_is_semicolon_terminated ) = @_;

        # Recombine Section 3:
        # Examine token at $ibeg_2 (right end of first line of pair)

        # Here are Indexes of the endpoint tokens of the two lines:
        #
        #  -----line $n-1--- | -----line $n-----
        #  $ibeg_1   $iend_1 | $ibeg_2   $iend_2
        #                        ^
        #                        |
        #                        -----Section 3 looks at this token

        # Returns:
        #   (nothing)         => do not join lines
        #   1, bs_tweak => ok to join lines

        # $bstweak is a small tolerance to add to bond strengths
        my $bs_tweak = 0;

        my $nmax   = @{$ri_end} - 1;
        my $ibeg_1 = $ri_beg->[ $n - 1 ];
        my $iend_1 = $ri_end->[ $n - 1 ];
        my $iend_2 = $ri_end->[$n];
        my $ibeg_2 = $ri_beg->[$n];

        my $ibeg_0    = $n > 1          ? $ri_beg->[ $n - 2 ] : -1;
        my $ibeg_3    = $n < $nmax      ? $ri_beg->[ $n + 1 ] : -1;
        my $ibeg_4    = $n + 2 <= $nmax ? $ri_beg->[ $n + 2 ] : -1;
        my $ibeg_nmax = $ri_beg->[$nmax];

        my $type_iend_1 = $types_to_go[$iend_1];
        my $type_iend_2 = $types_to_go[$iend_2];
        my $type_ibeg_1 = $types_to_go[$ibeg_1];
        my $type_ibeg_2 = $types_to_go[$ibeg_2];

        # handle lines with leading &&, ||
        if ( $is_amp_amp{$type_ibeg_2} ) {

            # ok to recombine if it follows a ? or :
            # and is followed by an open paren..
            my $ok =
              ( $is_ternary{$type_ibeg_1} && $tokens_to_go[$iend_2] eq '(' )

              # or is followed by a ? or : at same depth
              #
              # We are looking for something like this. We can
              # recombine the && line with the line above to make the
              # structure more clear:
              #  return
              #    exists $G->{Attr}->{V}
              #    && exists $G->{Attr}->{V}->{$u}
              #    ? %{ $G->{Attr}->{V}->{$u} }
              #    : ();
              #
              # We should probably leave something like this alone:
              #  return
              #       exists $G->{Attr}->{E}
              #    && exists $G->{Attr}->{E}->{$u}
              #    && exists $G->{Attr}->{E}->{$u}->{$v}
              #    ? %{ $G->{Attr}->{E}->{$u}->{$v} }
              #    : ();
              # so that we either have all of the &&'s (or ||'s)
              # on one line, as in the first example, or break at
              # each one as in the second example.  However, it
              # sometimes makes things worse to check for this because
              # it prevents multiple recombinations.  So this is not done.
              || ( $ibeg_3 >= 0
                && $is_ternary{ $types_to_go[$ibeg_3] }
                && $nesting_depth_to_go[$ibeg_3] ==
                $nesting_depth_to_go[$ibeg_2] );

            # Combine a trailing && term with an || term: fix for
            # c060 This is rare but can happen.
            $ok ||= 1
              if ( $ibeg_3 < 0
                && $type_ibeg_2 eq '&&'
                && $type_ibeg_1 eq '||'
                && $nesting_depth_to_go[$ibeg_2] ==
                $nesting_depth_to_go[$ibeg_1] );

            return if !$ok && $want_break_before{$type_ibeg_2};
            $forced_breakpoint_to_go[$iend_1] = 0;

            # tweak the bond strength to give this joint priority
            # over ? and :
            $bs_tweak = 0.25;
        }

        # Identify and recombine a broken ?/: chain
        elsif ( $type_ibeg_2 eq '?' ) {

            # Do not recombine different levels
            my $lev = $levels_to_go[$ibeg_2];
            return if ( $lev ne $levels_to_go[$ibeg_1] );

            # Do not recombine a '?' if either next line or
            # previous line does not start with a ':'.  The reasons
            # are that (1) no alignment of the ? will be possible
            # and (2) the expression is somewhat complex, so the
            # '?' is harder to see in the interior of the line.
            my $follows_colon  = $ibeg_1 >= 0 && $type_ibeg_1 eq ':';
            my $precedes_colon = $ibeg_3 >= 0 && $types_to_go[$ibeg_3] eq ':';
            return unless ( $follows_colon || $precedes_colon );

            # we will always combining a ? line following a : line
            if ( !$follows_colon ) {

                # ...otherwise recombine only if it looks like a
                # chain.  we will just look at a few nearby lines
                # to see if this looks like a chain.
                my $local_count = 0;
                foreach my $ii ( $ibeg_0, $ibeg_1, $ibeg_3, $ibeg_4 ) {
                    $local_count++
                      if $ii >= 0
                      && $types_to_go[$ii] eq ':'
                      && $levels_to_go[$ii] == $lev;
                }
                return if ( $local_count <= 1 );
            }
            $forced_breakpoint_to_go[$iend_1] = 0;
        }

        # do not recombine lines with leading '.'
        elsif ( $type_ibeg_2 eq '.' ) {
            my $i_next_nonblank = min( $inext_to_go[$ibeg_2], $iend_2 );
            my $summed_len_1    = $summed_lengths_to_go[ $iend_1 + 1 ] -
              $summed_lengths_to_go[$ibeg_1];
            my $summed_len_2 = $summed_lengths_to_go[ $iend_2 + 1 ] -
              $summed_lengths_to_go[$ibeg_2];

            my $combine_ok = (

                # ... unless there is just one and we can reduce
                # this to two lines if we do.  For example, this
                #
                #
                #  $bodyA .=
                #    '($dummy, $pat) = &get_next_tex_cmd;' . '$args .= $pat;'
                #
                #  looks better than this:
                #  $bodyA .= '($dummy, $pat) = &get_next_tex_cmd;'
                #    . '$args .= $pat;'

                ( $n == 2 && $n == $nmax && $type_ibeg_1 ne $type_ibeg_2 )

                  # ... or this would strand a short quote , like this
                  #                . "some long quote"
                  #                . "\n";
                  || (
                       $types_to_go[$i_next_nonblank] eq 'Q'
                    && $i_next_nonblank >= $iend_2 - 1
                    && $token_lengths_to_go[$i_next_nonblank] <
                    $rOpts_short_concatenation_item_length

                    #  additional constraints to fix c167
                    && (
                        $types_to_go[$iend_1] ne 'Q'

                        # allow a term shorter than the previous term
                        || $summed_len_2 < $summed_len_1

                        # or allow a short semicolon-terminated term if this
                        # makes two lines (see c169)
                        || (   $n == 2
                            && $n == $nmax
                            && $this_line_is_semicolon_terminated )
                    )
                  )
            );

            return if ( !$combine_ok );
        }

        # handle leading keyword..
        elsif ( $type_ibeg_2 eq 'k' ) {

            # handle leading "or"
            if ( $tokens_to_go[$ibeg_2] eq 'or' ) {

                my $combine_ok = (
                    $this_line_is_semicolon_terminated
                      && (
                        $type_ibeg_1 eq '}'
                        || (

                            # following 'if' or 'unless' or 'or'
                            $type_ibeg_1 eq 'k'
                            && $is_if_unless{ $tokens_to_go[$ibeg_1] }

                            # important: only combine a very simple
                            # or statement because the step below
                            # may have combined a trailing 'and'
                            # with this or, and we do not want to
                            # then combine everything together
                            && ( $iend_2 - $ibeg_2 <= 7 )
                        )
                      )
                );

                return if ( !$combine_ok );

                #X: RT #81854
                $forced_breakpoint_to_go[$iend_1] = 0
                  if ( !$old_breakpoint_to_go[$iend_1] );
            }

            # handle leading 'and' and 'xor'
            elsif ($tokens_to_go[$ibeg_2] eq 'and'
                || $tokens_to_go[$ibeg_2] eq 'xor' )
            {

                # Decide if we will combine a single terminal 'and'
                # after an 'if' or 'unless'.

                #     This looks best with the 'and' on the same
                #     line as the 'if':
                #
                #         $a = 1
                #           if $seconds and $nu < 2;
                #
                #     But this looks better as shown:
                #
                #         $a = 1
                #           if !$this->{Parents}{$_}
                #           or $this->{Parents}{$_} eq $_;
                #
                return
                  unless (
                    $this_line_is_semicolon_terminated
                    && (

                        # following 'if' or 'unless' or 'or'
                        $type_ibeg_1 eq 'k'
                        && (   $is_if_unless{ $tokens_to_go[$ibeg_1] }
                            || $tokens_to_go[$ibeg_1] eq 'or' )
                    )
                  );
            }

            # handle leading "if" and "unless"
            elsif ( $is_if_unless{ $tokens_to_go[$ibeg_2] } ) {

                # Combine something like:
                #    next
                #      if ( $lang !~ /${l}$/i );
                # into:
                #    next if ( $lang !~ /${l}$/i );
                return
                  unless (
                    $this_line_is_semicolon_terminated

                    #  previous line begins with 'and' or 'or'
                    && $type_ibeg_1 eq 'k'
                    && $is_and_or{ $tokens_to_go[$ibeg_1] }

                  );
            }

            # handle all other leading keywords
            else {

                # keywords look best at start of lines,
                # but combine things like "1 while"
                if ( !$is_assignment{$type_iend_1} ) {
                    return
                      if ( ( $type_iend_1 ne 'k' )
                        && ( $tokens_to_go[$ibeg_2] ne 'while' ) );
                }
            }
        }

        # similar treatment of && and || as above for 'and' and
        # 'or': NOTE: This block of code is currently bypassed
        # because of a previous block but is retained for possible
        # future use.
        elsif ( $is_amp_amp{$type_ibeg_2} ) {

            # maybe looking at something like:
            # unless $TEXTONLY || $item =~ m%</?(hr>|p>|a|img)%i;

            return
              unless (
                $this_line_is_semicolon_terminated

                # previous line begins with an 'if' or 'unless'
                # keyword
                && $type_ibeg_1 eq 'k'
                && $is_if_unless{ $tokens_to_go[$ibeg_1] }

              );
        }

        # handle line with leading = or similar
        elsif ( $is_assignment{$type_ibeg_2} ) {
            return unless ( $n == 1 || $n == $nmax );
            return if ( $old_breakpoint_to_go[$iend_1] );
            return
              unless (

                # unless we can reduce this to two lines
                $nmax == 2

                # or three lines, the last with a leading semicolon
                || ( $nmax == 3 && $types_to_go[$ibeg_nmax] eq ';' )

                # or the next line ends with a here doc
                || $type_iend_2 eq 'h'

                # or this is a short line ending in ;
                || (   $n == $nmax
                    && $this_line_is_semicolon_terminated )
              );
            $forced_breakpoint_to_go[$iend_1] = 0;
        }
        else {
            ## ok - not a special type
        }
        return ( 1, $bs_tweak );
    } ## end sub recombine_section_3

} ## end closure recombine_breakpoints

sub insert_final_ternary_breaks {

    my ( $self, $ri_left, $ri_right ) = @_;

    # Called once per batch to look for and do any final line breaks for
    # long ternary chains

    my $nmax = @{$ri_right} - 1;

    # scan the left and right end tokens of all lines
    my $i_first_colon = -1;
    for my $n ( 0 .. $nmax ) {
        my $il    = $ri_left->[$n];
        my $ir    = $ri_right->[$n];
        my $typel = $types_to_go[$il];
        my $typer = $types_to_go[$ir];
        return if ( $typel eq '?' );
        return if ( $typer eq '?' );
        if ( $typel eq ':' ) { $i_first_colon = $il; last; }
        if ( $typer eq ':' ) { $i_first_colon = $ir; last; }
    }

    # For long ternary chains,
    # if the first : we see has its ? is in the interior
    # of a preceding line, then see if there are any good
    # breakpoints before the ?.
    if ( $i_first_colon > 0 ) {
        my $i_question = $mate_index_to_go[$i_first_colon];
        if ( defined($i_question) && $i_question > 0 ) {
            my @insert_list;
            foreach my $ii ( reverse( 0 .. $i_question - 1 ) ) {
                my $token = $tokens_to_go[$ii];
                my $type  = $types_to_go[$ii];

                # For now, a good break is either a comma or,
                # in a long chain, a 'return'.
                # Patch for RT #126633: added the $nmax>1 check to avoid
                # breaking after a return for a simple ternary.  For longer
                # chains the break after return allows vertical alignment, so
                # it is still done.  So perltidy -wba='?' will not break
                # immediately after the return in the following statement:
                # sub x {
                #    return 0 ? 'aaaaaaaaaaaaaaaaaaaaa' :
                #      'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb';
                # }
                if (
                    (
                           $type eq ','
                        || $type eq 'k' && ( $nmax > 1 && $token eq 'return' )
                    )
                    && $self->in_same_container_i( $ii, $i_question )
                  )
                {
                    push @insert_list, $ii;
                    last;
                }
            }

            # insert any new break points
            if (@insert_list) {
                $self->insert_additional_breaks( \@insert_list, $ri_left,
                    $ri_right );
            }
        }
    }
    return;
} ## end sub insert_final_ternary_breaks

sub insert_breaks_before_list_opening_containers {

    my ( $self, $ri_left, $ri_right ) = @_;

    # This routine is called once per batch to implement the parameters
    # --break-before-hash-brace, etc.

    # Nothing to do if none of these parameters has been set
    return unless %break_before_container_types;

    my $nmax = @{$ri_right} - 1;
    return if ( $nmax < 0 );

    my $rLL = $self->[_rLL_];

    my $rbreak_before_container_by_seqno =
      $self->[_rbreak_before_container_by_seqno_];
    my $rK_weld_left = $self->[_rK_weld_left_];

    # scan the ends of all lines
    my @insert_list;
    for my $n ( 0 .. $nmax ) {
        my $il = $ri_left->[$n];
        my $ir = $ri_right->[$n];
        next if ( $ir <= $il );
        my $Kl       = $K_to_go[$il];
        my $Kr       = $K_to_go[$ir];
        my $Kend     = $Kr;
        my $type_end = $rLL->[$Kr]->[_TYPE_];

        # Backup before any side comment
        if ( $type_end eq '#' ) {
            $Kend = $self->K_previous_nonblank($Kr);
            next unless defined($Kend);
            $type_end = $rLL->[$Kend]->[_TYPE_];
        }

        # Backup to the start of any weld; fix for b1173.
        if ($total_weld_count) {
            my $Kend_test = $rK_weld_left->{$Kend};
            if ( defined($Kend_test) && $Kend_test > $Kl ) {
                $Kend      = $Kend_test;
                $Kend_test = $rK_weld_left->{$Kend};
            }

            # Do not break if we did not back up to the start of a weld
            # (shouldn't happen)
            next if ( defined($Kend_test) );
        }

        my $token = $rLL->[$Kend]->[_TOKEN_];
        next if ( !$is_opening_token{$token} );
        next if ( $Kl >= $Kend - 1 );

        my $seqno = $rLL->[$Kend]->[_TYPE_SEQUENCE_];
        next if ( !defined($seqno) );

        # Use the flag which was previously set
        next unless ( $rbreak_before_container_by_seqno->{$seqno} );

        # Install a break before this opening token.
        my $Kbreak = $self->K_previous_nonblank($Kend);
        my $ibreak = $Kbreak - $Kl + $il;
        next if ( $ibreak < $il );
        next if ( $nobreak_to_go[$ibreak] );
        push @insert_list, $ibreak;
    }

    # insert any new break points
    if (@insert_list) {
        $self->insert_additional_breaks( \@insert_list, $ri_left, $ri_right );
    }
    return;
} ## end sub insert_breaks_before_list_opening_containers

sub note_added_semicolon {
    my ( $self, $line_number ) = @_;
    $self->[_last_added_semicolon_at_] = $line_number;
    if ( $self->[_added_semicolon_count_] == 0 ) {
        $self->[_first_added_semicolon_at_] = $line_number;
    }
    $self->[_added_semicolon_count_]++;
    write_logfile_entry("Added ';' here\n");
    return;
} ## end sub note_added_semicolon

sub note_deleted_semicolon {
    my ( $self, $line_number ) = @_;
    $self->[_last_deleted_semicolon_at_] = $line_number;
    if ( $self->[_deleted_semicolon_count_] == 0 ) {
        $self->[_first_deleted_semicolon_at_] = $line_number;
    }
    $self->[_deleted_semicolon_count_]++;
    write_logfile_entry("Deleted unnecessary ';' at line $line_number\n");
    return;
} ## end sub note_deleted_semicolon

sub note_embedded_tab {
    my ( $self, $line_number ) = @_;
    $self->[_embedded_tab_count_]++;
    $self->[_last_embedded_tab_at_] = $line_number;
    if ( !$self->[_first_embedded_tab_at_] ) {
        $self->[_first_embedded_tab_at_] = $line_number;
    }

    if ( $self->[_embedded_tab_count_] <= MAX_NAG_MESSAGES ) {
        write_logfile_entry("Embedded tabs in quote or pattern\n");
    }
    return;
} ## end sub note_embedded_tab

use constant DEBUG_CORRECT_LP => 0;

sub correct_lp_indentation {

    # When the -lp option is used, we need to make a last pass through
    # each line to correct the indentation positions in case they differ
    # from the predictions.  This is necessary because perltidy uses a
    # predictor/corrector method for aligning with opening parens.  The
    # predictor is usually good, but sometimes stumbles.  The corrector
    # tries to patch things up once the actual opening paren locations
    # are known.
    my ( $self, $ri_first, $ri_last ) = @_;

    # first remove continuation indentation if appropriate
    my $max_line = @{$ri_first} - 1;

    #---------------------------------------------------------------------------
    # PASS 1: reduce indentation if necessary at any long one-line blocks (c098)
    #---------------------------------------------------------------------------

    # The point is that sub 'starting_one_line_block' made one-line blocks based
    # on default indentation, not -lp indentation. So some of the one-line
    # blocks may be too long when given -lp indentation.  We will fix that now
    # if possible, using the list of these closing block indexes.
    my $ri_starting_one_line_block =
      $self->[_this_batch_]->[_ri_starting_one_line_block_];
    if ( @{$ri_starting_one_line_block} ) {
        $self->correct_lp_indentation_pass_1( $ri_first, $ri_last,
            $ri_starting_one_line_block );
    }

    #-------------------------------------------------------------------
    # PASS 2: look for and fix other problems in each line of this batch
    #-------------------------------------------------------------------

    # look at each output line ...
    foreach my $line ( 0 .. $max_line ) {
        my $ibeg = $ri_first->[$line];
        my $iend = $ri_last->[$line];

        # looking at each token in this output line ...
        foreach my $i ( $ibeg .. $iend ) {

            # How many space characters to place before this token
            # for special alignment.  Actual padding is done in the
            # continue block.

            # looking for next unvisited indentation item ...
            my $indentation = $leading_spaces_to_go[$i];

            # This is just for indentation objects (c098)
            next unless ( ref($indentation) );

            # Visit each indentation object just once
            next if ( $indentation->get_marked() );

            # Mark first visit
            $indentation->set_marked(1);

            # Skip indentation objects which do not align with container tokens
            my $align_seqno = $indentation->get_align_seqno();
            next unless ($align_seqno);

            # Skip a container which is entirely on this line
            my $Ko = $self->[_K_opening_container_]->{$align_seqno};
            my $Kc = $self->[_K_closing_container_]->{$align_seqno};
            if ( defined($Ko) && defined($Kc) ) {
                next if ( $Ko >= $K_to_go[$ibeg] && $Kc <= $K_to_go[$iend] );
            }

            #  Note on flag '$do_not_pad':
            #  We want to avoid a situation like this, where the aligner
            #  inserts whitespace before the '=' to align it with a previous
            #  '=', because otherwise the parens might become mis-aligned in a
            #  situation like this, where the '=' has become aligned with the
            #  previous line, pushing the opening '(' forward beyond where we
            #  want it.
            #
            #  $mkFloor::currentRoom = '';
            #  $mkFloor::c_entry     = $c->Entry(
            #                                 -width        => '10',
            #                                 -relief       => 'sunken',
            #                                 ...
            #                                 );
            #
            #  We leave it to the aligner to decide how to do this.
            if ( $line == 1 && $i == $ibeg ) {
                $self->[_this_batch_]->[_do_not_pad_] = 1;
            }

            #--------------------------------------------
            # Now see what the error is and try to fix it
            #--------------------------------------------
            my $closing_index = $indentation->get_closed();
            my $predicted_pos = $indentation->get_spaces();

            # Find actual position:
            my $actual_pos;

            if ( $i == $ibeg ) {

                # Case 1: token is first character of of batch - table lookup
                if ( $line == 0 ) {

                    $actual_pos = $predicted_pos;

                    my ( $indent, $offset, $is_leading, $exists ) =
                      get_saved_opening_indentation($align_seqno);
                    if ( defined($indent) ) {

                        # NOTE: we could use '1' here if no space after
                        # opening and '2' if want space; it is hardwired at 1
                        # like -gnu-style. But it is probably best to leave
                        # this alone because changing it would change
                        # formatting of much existing code without any
                        # significant benefit.
                        $actual_pos = get_spaces($indent) + $offset + 1;
                    }
                }

                # Case 2: token starts a new line - use length of previous line
                else {

                    my $ibegm = $ri_first->[ $line - 1 ];
                    my $iendm = $ri_last->[ $line - 1 ];
                    $actual_pos = total_line_length( $ibegm, $iendm );

                    # follow -pt style
                    ++$actual_pos
                      if ( $types_to_go[ $iendm + 1 ] eq 'b' );

                }
            }

            # Case 3: $i>$ibeg: token is mid-line - use length to previous token
            else {

                $actual_pos = total_line_length( $ibeg, $i - 1 );

                # for mid-line token, we must check to see if all
                # additional lines have continuation indentation,
                # and remove it if so.  Otherwise, we do not get
                # good alignment.
                if ( $closing_index > $iend ) {
                    my $ibeg_next = $ri_first->[ $line + 1 ];
                    if ( $ci_levels_to_go[$ibeg_next] > 0 ) {
                        $self->undo_lp_ci( $line, $i, $closing_index,
                            $ri_first, $ri_last );
                    }
                }
            }

            # By how many spaces (plus or minus) would we need to increase the
            # indentation to get alignment with the opening token?
            my $move_right = $actual_pos - $predicted_pos;

            if (DEBUG_CORRECT_LP) {
                my $tok   = substr( $tokens_to_go[$i], 0, 8 );
                my $avail = $self->get_available_spaces_to_go($ibeg);
                print
"CORRECT_LP for seq=$align_seqno, predicted pos=$predicted_pos actual=$actual_pos => move right=$move_right available=$avail i=$i max=$max_index_to_go tok=$tok\n";
            }

            # nothing more to do if no error to correct (gnu2.t)
            if ( $move_right == 0 ) {
                $indentation->set_recoverable_spaces($move_right);
                next;
            }

            # Get any collapsed length defined for -xlp
            my $collapsed_length =
              $self->[_rcollapsed_length_by_seqno_]->{$align_seqno};
            $collapsed_length = 0 unless ( defined($collapsed_length) );

            if (DEBUG_CORRECT_LP) {
                print
"CORRECT_LP for seq=$align_seqno, collapsed length is $collapsed_length\n";
            }

            # if we have not seen closure for this indentation in this batch,
            # and do not have a collapsed length estimate, we can only pass on
            # a request to the vertical aligner
            if ( $closing_index < 0 && !$collapsed_length ) {
                $indentation->set_recoverable_spaces($move_right);
                next;
            }

            # If necessary, look ahead to see if there is really any leading
            # whitespace dependent on this whitespace, and also find the
            # longest line using this whitespace.  Since it is always safe to
            # move left if there are no dependents, we only need to do this if
            # we may have dependent nodes or need to move right.

            my $have_child = $indentation->get_have_child();
            my %saw_indentation;
            my $line_count = 1;
            $saw_indentation{$indentation} = $indentation;

            # How far can we move right before we hit the limit?
            # let $right_margen = the number of spaces that we can increase
            # the current indentation before hitting the maximum line length.
            my $right_margin = 0;

            if ( $have_child || $move_right > 0 ) {
                $have_child = 0;

                # include estimated collapsed length for incomplete containers
                my $max_length = 0;
                if ( $Kc > $K_to_go[$max_index_to_go] ) {
                    $max_length = $collapsed_length + $predicted_pos;
                }

                if ( $i == $ibeg ) {
                    my $length = total_line_length( $ibeg, $iend );
                    if ( $length > $max_length ) { $max_length = $length }
                }

                # look ahead at the rest of the lines of this batch..
                foreach my $line_t ( $line + 1 .. $max_line ) {
                    my $ibeg_t = $ri_first->[$line_t];
                    my $iend_t = $ri_last->[$line_t];
                    last if ( $closing_index <= $ibeg_t );

                    # remember all different indentation objects
                    my $indentation_t = $leading_spaces_to_go[$ibeg_t];
                    $saw_indentation{$indentation_t} = $indentation_t;
                    $line_count++;

                    # remember longest line in the group
                    my $length_t = total_line_length( $ibeg_t, $iend_t );
                    if ( $length_t > $max_length ) {
                        $max_length = $length_t;
                    }
                }

                $right_margin =
                  $maximum_line_length_at_level[ $levels_to_go[$ibeg] ] -
                  $max_length;
                if ( $right_margin < 0 ) { $right_margin = 0 }
            }

            my $first_line_comma_count =
              grep { $_ eq ',' } @types_to_go[ $ibeg .. $iend ];
            my $comma_count = $indentation->get_comma_count();
            my $arrow_count = $indentation->get_arrow_count();

            # This is a simple approximate test for vertical alignment:
            # if we broke just after an opening paren, brace, bracket,
            # and there are 2 or more commas in the first line,
            # and there are no '=>'s,
            # then we are probably vertically aligned.  We could set
            # an exact flag in sub break_lists, but this is good
            # enough.
            my $indentation_count = keys %saw_indentation;
            my $is_vertically_aligned =
              (      $i == $ibeg
                  && $first_line_comma_count > 1
                  && $indentation_count == 1
                  && ( $arrow_count == 0 || $arrow_count == $line_count ) );

            # Make the move if possible ..
            if (

                # we can always move left
                $move_right < 0

                # -xlp

                # incomplete container
                || (   $rOpts_extended_line_up_parentheses
                    && $Kc > $K_to_go[$max_index_to_go] )
                || $closing_index < 0

                # but we should only move right if we are sure it will
                # not spoil vertical alignment
                || ( $comma_count == 0 )
                || ( $comma_count > 0 && !$is_vertically_aligned )
              )
            {
                my $move =
                  ( $move_right <= $right_margin )
                  ? $move_right
                  : $right_margin;

                if (DEBUG_CORRECT_LP) {
                    print
                      "CORRECT_LP for seq=$align_seqno, moving $move spaces\n";
                }

                foreach ( keys %saw_indentation ) {
                    $saw_indentation{$_}
                      ->permanently_decrease_available_spaces( -$move );
                }
            }

            # Otherwise, record what we want and the vertical aligner
            # will try to recover it.
            else {
                $indentation->set_recoverable_spaces($move_right);
            }
        } ## end loop over tokens in a line
    } ## end loop over lines
    return;
} ## end sub correct_lp_indentation

sub correct_lp_indentation_pass_1 {
    my ( $self, $ri_first, $ri_last, $ri_starting_one_line_block ) = @_;

    # So some of the one-line blocks may be too long when given -lp
    # indentation.  We will fix that now if possible, using the list of these
    # closing block indexes.

    my @ilist = @{$ri_starting_one_line_block};
    return unless (@ilist);

    my $max_line = @{$ri_first} - 1;
    my $inext    = shift(@ilist);

    # loop over lines, checking length of each with a one-line block
    my ( $ibeg, $iend );
    foreach my $line ( 0 .. $max_line ) {
        $iend = $ri_last->[$line];
        next if ( $inext > $iend );
        $ibeg = $ri_first->[$line];

        # This is just for lines with indentation objects (c098)
        my $excess =
          ref( $leading_spaces_to_go[$ibeg] )
          ? $self->excess_line_length( $ibeg, $iend )
          : 0;

        if ( $excess > 0 ) {
            my $available_spaces = $self->get_available_spaces_to_go($ibeg);

            if ( $available_spaces > 0 ) {
                my $delete_want = min( $available_spaces, $excess );
                my $deleted_spaces =
                  $self->reduce_lp_indentation( $ibeg, $delete_want );
                $available_spaces = $self->get_available_spaces_to_go($ibeg);
            }
        }

        # skip forward to next one-line block to check
        while (@ilist) {
            $inext = shift @ilist;
            next if ( $inext <= $iend );
            last if ( $inext > $iend );
        }
        last if ( $inext <= $iend );
    }
    return;
} ## end sub correct_lp_indentation_pass_1

sub undo_lp_ci {

    # If there is a single, long parameter within parens, like this:
    #
    #  $self->command( "/msg "
    #        . $infoline->chan
    #        . " You said $1, but did you know that it's square was "
    #        . $1 * $1 . " ?" );
    #
    # we can remove the continuation indentation of the 2nd and higher lines
    # to achieve this effect, which is more pleasing:
    #
    #  $self->command("/msg "
    #                 . $infoline->chan
    #                 . " You said $1, but did you know that it's square was "
    #                 . $1 * $1 . " ?");

    my ( $self, $line_open, $i_start, $closing_index, $ri_first, $ri_last ) =
      @_;
    my $max_line = @{$ri_first} - 1;

    # must be multiple lines
    return if ( $max_line <= $line_open );

    my $lev_start     = $levels_to_go[$i_start];
    my $ci_start_plus = 1 + $ci_levels_to_go[$i_start];

    # see if all additional lines in this container have continuation
    # indentation
    my $line_1 = 1 + $line_open;
    my $n      = $line_open;

    while ( ++$n <= $max_line ) {
        my $ibeg = $ri_first->[$n];
        my $iend = $ri_last->[$n];
        if ( $ibeg eq $closing_index ) { $n--; last }
        return if ( $lev_start != $levels_to_go[$ibeg] );
        return if ( $ci_start_plus != $ci_levels_to_go[$ibeg] );
        last   if ( $closing_index <= $iend );
    }

    # we can reduce the indentation of all continuation lines
    my $continuation_line_count = $n - $line_open;
    @ci_levels_to_go[ @{$ri_first}[ $line_1 .. $n ] ] =
      (0) x ($continuation_line_count);
    @leading_spaces_to_go[ @{$ri_first}[ $line_1 .. $n ] ] =
      @reduced_spaces_to_go[ @{$ri_first}[ $line_1 .. $n ] ];
    return;
} ## end sub undo_lp_ci

################################################
# CODE SECTION 10: Code to break long statements
################################################

use constant DEBUG_BREAK_LINES => 0;

sub break_long_lines {

    #-----------------------------------------------------------
    # Break a batch of tokens into lines which do not exceed the
    # maximum line length.
    #-----------------------------------------------------------

    my ( $self, $saw_good_break, $rcolon_list, $rbond_strength_bias ) = @_;

    # Input parameters:
    #  $saw_good_break - a flag set by break_lists
    #  $rcolon_list    - ref to a list of all the ? and : tokens in the batch,
    #    in order.
    #  $rbond_strength_bias - small bond strength bias values set by break_lists

    # Output: returns references to the arrays:
    #  @i_first
    #  @i_last
    # which contain the indexes $i of the first and last tokens on each
    # line.

    # In addition, the array:
    #   $forced_breakpoint_to_go[$i]
    # may be updated to be =1 for any index $i after which there must be
    # a break.  This signals later routines not to undo the breakpoint.

    # Method:
    # This routine is called if a statement is longer than the maximum line
    # length, or if a preliminary scanning located desirable break points.
    # Sub break_lists has already looked at these tokens and set breakpoints
    # (in array $forced_breakpoint_to_go[$i]) where it wants breaks (for
    # example after commas, after opening parens, and before closing parens).
    # This routine will honor these breakpoints and also add additional
    # breakpoints as necessary to keep the line length below the maximum
    # requested.  It bases its decision on where the 'bond strength' is
    # lowest.

    my @i_first        = ();    # the first index to output
    my @i_last         = ();    # the last index to output
    my @i_colon_breaks = ();    # needed to decide if we have to break at ?'s
    if ( $types_to_go[0] eq ':' ) { push @i_colon_breaks, 0 }

    # Get the 'bond strengths' between tokens
    my $rbond_strength_to_go = $self->set_bond_strengths();

    # Add any comma bias set by break_lists
    if ( @{$rbond_strength_bias} ) {
        foreach my $item ( @{$rbond_strength_bias} ) {
            my ( $ii, $bias ) = @{$item};
            if ( $ii >= 0 && $ii <= $max_index_to_go ) {
                $rbond_strength_to_go->[$ii] += $bias;
            }
            else {
                if (DEVEL_MODE) {
                    my $KK  = $K_to_go[0];
                    my $lno = $self->[_rLL_]->[$KK]->[_LINE_INDEX_];
                    Fault(
"Bad bond strength bias near line $lno: i=$ii must be between 0 and $max_index_to_go\n"
                    );
                }
            }
        }
    }

    my $imin = 0;
    my $imax = $max_index_to_go;
    if ( $types_to_go[$imin] eq 'b' ) { $imin++ }
    if ( $types_to_go[$imax] eq 'b' ) { $imax-- }

    my $i_begin             = $imin;
    my $last_break_strength = NO_BREAK;
    my $i_last_break        = -1;
    my $line_count          = 0;

    # see if any ?/:'s are in order
    my $colons_in_order = 1;
    my $last_tok        = EMPTY_STRING;
    foreach ( @{$rcolon_list} ) {
        if ( $_ eq $last_tok ) { $colons_in_order = 0; last }
        $last_tok = $_;
    }

    # This is a sufficient but not necessary condition for colon chain
    my $is_colon_chain = ( $colons_in_order && @{$rcolon_list} > 2 );

    #------------------------------------------
    # BEGINNING of main loop to set breakpoints
    # Keep iterating until we reach the end
    #------------------------------------------
    while ( $i_begin <= $imax ) {

        #------------------------------------------------------------------
        # Find the best next breakpoint based on token-token bond strengths
        #------------------------------------------------------------------
        my ( $i_lowest, $lowest_strength, $leading_alignment_type, $Msg ) =
          $self->break_lines_inner_loop(

            $i_begin,
            $i_last_break,
            $imax,
            $last_break_strength,
            $line_count,
            $rbond_strength_to_go,
            $saw_good_break,

          );

        # Now make any adjustments required by ternary breakpoint rules
        if ( @{$rcolon_list} ) {

            my $i_next_nonblank = $inext_to_go[$i_lowest];

            #-------------------------------------------------------
            # ?/: rule 1 : if a break here will separate a '?' on this
            # line from its closing ':', then break at the '?' instead.
            # But do not break a sequential chain of ?/: statements
            #-------------------------------------------------------
            if ( !$is_colon_chain ) {
                foreach my $i ( $i_begin + 1 .. $i_lowest - 1 ) {
                    next unless ( $tokens_to_go[$i] eq '?' );

                    # do not break if statement is broken by side comment
                    next
                      if ( $tokens_to_go[$max_index_to_go] eq '#'
                        && terminal_type_i( 0, $max_index_to_go ) !~
                        /^[\;\}]$/ );

                    # no break needed if matching : is also on the line
                    next
                      if ( defined( $mate_index_to_go[$i] )
                        && $mate_index_to_go[$i] <= $i_next_nonblank );

                    $i_lowest = $i;
                    if ( $want_break_before{'?'} ) { $i_lowest-- }
                    $i_next_nonblank = $inext_to_go[$i_lowest];
                    last;
                }
            }

            my $next_nonblank_type = $types_to_go[$i_next_nonblank];

            #-------------------------------------------------------------
            # ?/: rule 2 : if we break at a '?', then break at its ':'
            #
            # Note: this rule is also in sub break_lists to handle a break
            # at the start and end of a line (in case breaks are dictated
            # by side comments).
            #-------------------------------------------------------------
            if ( $next_nonblank_type eq '?' ) {
                $self->set_closing_breakpoint($i_next_nonblank);
            }
            elsif ( $types_to_go[$i_lowest] eq '?' ) {
                $self->set_closing_breakpoint($i_lowest);
            }
            else {
                ## ok
            }

            #--------------------------------------------------------
            # ?/: rule 3 : if we break at a ':' then we save
            # its location for further work below.  We may need to go
            # back and break at its '?'.
            #--------------------------------------------------------
            if ( $next_nonblank_type eq ':' ) {
                push @i_colon_breaks, $i_next_nonblank;
            }
            elsif ( $types_to_go[$i_lowest] eq ':' ) {
                push @i_colon_breaks, $i_lowest;
            }
            else {
                ## ok
            }

            # here we should set breaks for all '?'/':' pairs which are
            # separated by this line
        }

        # guard against infinite loop (should never happen)
        if ( $i_lowest <= $i_last_break ) {
            DEVEL_MODE
              && Fault("i_lowest=$i_lowest <= i_last_break=$i_last_break\n");
            $i_lowest = $imax;
        }

        DEBUG_BREAK_LINES
          && print {*STDOUT}
"BREAK: best is i = $i_lowest strength = $lowest_strength;\nReason>> $Msg\n";

        $line_count++;

        # save this line segment, after trimming blanks at the ends
        push( @i_first,
            ( $types_to_go[$i_begin] eq 'b' ) ? $i_begin + 1 : $i_begin );
        push( @i_last,
            ( $types_to_go[$i_lowest] eq 'b' ) ? $i_lowest - 1 : $i_lowest );

        # set a forced breakpoint at a container opening, if necessary, to
        # signal a break at a closing container.  Excepting '(' for now.
        if (
            (
                   $tokens_to_go[$i_lowest] eq '{'
                || $tokens_to_go[$i_lowest] eq '['
            )
            && !$forced_breakpoint_to_go[$i_lowest]
          )
        {
            $self->set_closing_breakpoint($i_lowest);
        }

        # get ready to find the next breakpoint
        $last_break_strength = $lowest_strength;
        $i_last_break        = $i_lowest;
        $i_begin             = $i_lowest + 1;

        # skip past a blank
        if ( ( $i_begin <= $imax ) && ( $types_to_go[$i_begin] eq 'b' ) ) {
            $i_begin++;
        }
    }

    #-------------------------------------------------
    # END of main loop to set continuation breakpoints
    #-------------------------------------------------

    #-----------------------------------------------------------
    # ?/: rule 4 -- if we broke at a ':', then break at
    # corresponding '?' unless this is a chain of ?: expressions
    #-----------------------------------------------------------
    if (@i_colon_breaks) {
        my $is_chain = ( $colons_in_order && @i_colon_breaks > 1 );
        if ( !$is_chain ) {
            $self->do_colon_breaks( \@i_colon_breaks, \@i_first, \@i_last );
        }
    }

    return ( \@i_first, \@i_last, $rbond_strength_to_go );
} ## end sub break_long_lines

# small bond strength numbers to help break ties
use constant TINY_BIAS => 0.0001;
use constant MAX_BIAS  => 0.001;

sub break_lines_inner_loop {

    #-----------------------------------------------------------------
    # Find the best next breakpoint in index range ($i_begin .. $imax)
    # which, if possible, does not exceed the maximum line length.
    #-----------------------------------------------------------------

    my (
        $self,    #

        $i_begin,
        $i_last_break,
        $imax,
        $last_break_strength,
        $line_count,
        $rbond_strength_to_go,
        $saw_good_break,

    ) = @_;

    # Given:
    #   $i_begin               = first index of range
    #   $i_last_break          = index of previous break
    #   $imax                  = last index of range
    #   $last_break_strength   = bond strength of last break
    #   $line_count            = number of output lines so far
    #   $rbond_strength_to_go  = ref to array of bond strengths
    #   $saw_good_break        = true if old line had a good breakpoint

    # Returns:
    #   $i_lowest               = index of best breakpoint
    #   $lowest_strength        = 'bond strength' at best breakpoint
    #   $leading_alignment_type = special token type after break
    #   $Msg                    = string of debug info

    my $Msg                    = EMPTY_STRING;
    my $strength               = NO_BREAK;
    my $i_test                 = $i_begin - 1;
    my $i_lowest               = -1;
    my $starting_sum           = $summed_lengths_to_go[$i_begin];
    my $lowest_strength        = NO_BREAK;
    my $leading_alignment_type = EMPTY_STRING;
    my $leading_spaces         = leading_spaces_to_go($i_begin);
    my $maximum_line_length =
      $maximum_line_length_at_level[ $levels_to_go[$i_begin] ];
    DEBUG_BREAK_LINES
      && do {
        $Msg .= "updating leading spaces to be $leading_spaces at i=$i_begin\n";
      };

    # Do not separate an isolated bare word from an opening paren.
    # Alternate Fix #2 for issue b1299.  This waits as long as possible
    # to make the decision.
    # Note for fix #c250: to keep line breaks unchanged under -extrude when
    # switching from 'i' to 'S' for subs, we would have to also check 'S', i.e.
    # =~/^[Si]$/.  But this was never necessary at a sub signature, so we leave
    # it alone and allow the new version to be different for --extrude. For a
    # test file run perl527/signatures.t with --extrude.
    if ( $types_to_go[$i_begin] eq 'i'
        && substr( $tokens_to_go[$i_begin], 0, 1 ) =~ /\w/ )
    {
        my $i_next_nonblank = $inext_to_go[$i_begin];
        if ( $tokens_to_go[$i_next_nonblank] eq '(' ) {
            $rbond_strength_to_go->[$i_begin] = NO_BREAK;
        }
    }

    # Avoid a break which would strand a single punctuation
    # token.  For example, we do not want to strand a leading
    # '.' which is followed by a long quoted string.
    # But note that we do want to do this with -extrude (l=1)
    # so please test any changes to this code on -extrude.
    if (
           ( $i_begin < $imax )
        && ( $tokens_to_go[$i_begin] eq $types_to_go[$i_begin] )
        && !$forced_breakpoint_to_go[$i_begin]
        && !(

            # Allow break after a closing eval brace. This is an
            # approximate way to simulate a forced breakpoint made in
            # Section B below.  No differences have been found, but if
            # necessary the full logic of Section B could be used here
            # (see c165).
            $tokens_to_go[$i_begin] eq '}'
            && $block_type_to_go[$i_begin]
            && $block_type_to_go[$i_begin] eq 'eval'
        )
        && (
            (
                $leading_spaces +
                $summed_lengths_to_go[ $i_begin + 1 ] -
                $starting_sum
            ) < $maximum_line_length
        )
      )
    {
        $i_test = min( $imax, $inext_to_go[$i_begin] ) - 1;
        DEBUG_BREAK_LINES && do {
            $Msg .= " :skip ahead at i=$i_test";
        };
    }

    #-------------------------------------------------------
    # Begin INNER_LOOP over the indexes in the _to_go arrays
    #-------------------------------------------------------
    while ( ++$i_test <= $imax ) {
        my $type                     = $types_to_go[$i_test];
        my $token                    = $tokens_to_go[$i_test];
        my $i_next_nonblank          = $inext_to_go[$i_test];
        my $next_nonblank_type       = $types_to_go[$i_next_nonblank];
        my $next_nonblank_token      = $tokens_to_go[$i_next_nonblank];
        my $next_nonblank_block_type = $block_type_to_go[$i_next_nonblank];

        #---------------------------------------------------------------
        # Section A: Get token-token strength and handle any adjustments
        #---------------------------------------------------------------

        # adjustments to the previous bond strength may have been made, and
        # we must keep the bond strength of a token and its following blank
        # the same;
        my $last_strength = $strength;
        $strength = $rbond_strength_to_go->[$i_test];
        if ( $type eq 'b' ) { $strength = $last_strength }

        # reduce strength a bit to break ties at an old comma breakpoint ...
        if (

            $old_breakpoint_to_go[$i_test]

            # Patch: limited to just commas to avoid blinking states
            && $type eq ','

            # which is a 'good' breakpoint, meaning ...
            # we don't want to break before it
            && !$want_break_before{$type}

            # and either we want to break before the next token
            # or the next token is not short (i.e. not a '*', '/' etc.)
            && $i_next_nonblank <= $imax
            && (   $want_break_before{$next_nonblank_type}
                || $token_lengths_to_go[$i_next_nonblank] > 2
                || $next_nonblank_type eq ','
                || $is_opening_type{$next_nonblank_type} )
          )
        {
            $strength -= TINY_BIAS;
            DEBUG_BREAK_LINES && do { $Msg .= " :-bias at i=$i_test" };
        }

        # otherwise increase strength a bit if this token would be at the
        # maximum line length.  This is necessary to avoid blinking
        # in the above example when the -iob flag is added.
        else {
            my $len =
              $leading_spaces +
              $summed_lengths_to_go[ $i_test + 1 ] -
              $starting_sum;
            if ( $len >= $maximum_line_length ) {
                $strength += TINY_BIAS;
                DEBUG_BREAK_LINES && do { $Msg .= " :+bias at i=$i_test" };
            }
        }

        #-------------------------------------
        # Section B: Handle forced breakpoints
        #-------------------------------------
        my $must_break;

        # Force an immediate break at certain operators
        # with lower level than the start of the line,
        # unless we've already seen a better break.
        #
        # Note on an issue with a preceding '?' :

        # There may be a break at a previous ? if the line is long.  Because
        # of this we do not want to force a break if there is a previous ? on
        # this line.  For now the best way to do this is to not break if we
        # have seen a lower strength point, which is probably a ?.
        #
        # Example of unwanted breaks we are avoiding at a '.' following a ?
        # from pod2html using perltidy -gnu:
        # )
        # ? "\n&lt;A NAME=\""
        # . $value
        # . "\"&gt;\n$text&lt;/A&gt;\n"
        # : "\n$type$pod2.html\#" . $value . "\"&gt;$text&lt;\/A&gt;\n";
        if (
            ( $strength <= $lowest_strength )
            && ( $nesting_depth_to_go[$i_begin] >
                $nesting_depth_to_go[$i_next_nonblank] )
            && (
                $next_nonblank_type =~ /^(\.|\&\&|\|\|)$/
                || (
                    $next_nonblank_type eq 'k'

                    ##  /^(and|or)$/  # note: includes 'xor' now
                    && $is_and_or{$next_nonblank_token}
                )
            )
          )
        {
            $self->set_forced_breakpoint($i_next_nonblank);
            DEBUG_BREAK_LINES
              && do { $Msg .= " :Forced break at i=$i_next_nonblank" };
        }

        if (

            # Try to put a break where requested by break_lists
            $forced_breakpoint_to_go[$i_test]

            # break between ) { in a continued line so that the '{' can
            # be outdented
            # See similar logic in break_lists which catches instances
            # where a line is just something like ') {'.  We have to
            # be careful because the corresponding block keyword might
            # not be on the first line, such as 'for' here:
            #
            # eval {
            #     for ("a") {
            #         for $x ( 1, 2 ) { local $_ = "b"; s/(.*)/+$1/ }
            #     }
            # };
            #
            || (
                   $line_count
                && ( $token eq ')' )
                && ( $next_nonblank_type eq '{' )
                && ($next_nonblank_block_type)
                && ( $next_nonblank_block_type ne $tokens_to_go[$i_begin] )

                # RT #104427: Dont break before opening sub brace because
                # sub block breaks handled at higher level, unless
                # it looks like the preceding list is long and broken
                && !(

                    (
                           $next_nonblank_block_type =~ /$SUB_PATTERN/
                        || $matches_ASUB{$next_nonblank_block_type}
                    )
                    && ( $nesting_depth_to_go[$i_begin] ==
                        $nesting_depth_to_go[$i_next_nonblank] )
                )

                && !$rOpts_opening_brace_always_on_right
            )

            # There is an implied forced break at a terminal opening brace
            || ( ( $type eq '{' ) && ( $i_test == $imax ) )
          )
        {

            # Forced breakpoints must sometimes be overridden, for example
            # because of a side comment causing a NO_BREAK.  It is easier
            # to catch this here than when they are set.
            if ( $strength < NO_BREAK - 1 ) {
                $strength   = $lowest_strength - TINY_BIAS;
                $must_break = 1;
                DEBUG_BREAK_LINES
                  && do { $Msg .= " :set must_break at i=$i_next_nonblank" };
            }
        }

        # quit if a break here would put a good terminal token on
        # the next line and we already have a possible break
        if (
               ( $next_nonblank_type eq ';' || $next_nonblank_type eq ',' )
            && !$must_break
            && (
                (
                    $leading_spaces +
                    $summed_lengths_to_go[ $i_next_nonblank + 1 ] -
                    $starting_sum
                ) > $maximum_line_length
            )
          )
        {
            if ( $i_lowest >= 0 ) {
                DEBUG_BREAK_LINES && do {
                    $Msg .= " :quit at good terminal='$next_nonblank_type'";
                };
                last;
            }
        }

        #------------------------------------------------------------
        # Section C: Look for the lowest bond strength between tokens
        #------------------------------------------------------------
        if ( ( $strength <= $lowest_strength ) && ( $strength < NO_BREAK ) ) {

            # break at previous best break if it would have produced
            # a leading alignment of certain common tokens, and it
            # is different from the latest candidate break
            if ($leading_alignment_type) {
                DEBUG_BREAK_LINES && do {
                    $Msg .=
                      " :last at leading_alignment='$leading_alignment_type'";
                };
                last;
            }

            # Force at least one breakpoint if old code had good
            # break It is only called if a breakpoint is required or
            # desired.  This will probably need some adjustments
            # over time.  A goal is to try to be sure that, if a new
            # side comment is introduced into formatted text, then
            # the same breakpoints will occur.  scbreak.t
            if (
                $i_test == $imax            # we are at the end
                && !$forced_breakpoint_count
                && $saw_good_break          # old line had good break
                && $type =~ /^[#;\{]$/      # and this line ends in
                                            # ';' or side comment
                && $i_last_break < 0        # and we haven't made a break
                && $i_lowest >= 0           # and we saw a possible break
                && $i_lowest < $imax - 1    # (but not just before this ;)
                && $strength - $lowest_strength < 0.5 * WEAK    # and it's good
              )
            {

                DEBUG_BREAK_LINES && do {
                    $Msg .= " :last at good old break\n";
                };
                last;
            }

            # Do not skip past an important break point in a short final
            # segment.  For example, without this check we would miss the
            # break at the final / in the following code:
            #
            #  $depth_stop =
            #    ( $tau * $mass_pellet * $q_0 *
            #        ( 1. - exp( -$t_stop / $tau ) ) -
            #        4. * $pi * $factor * $k_ice *
            #        ( $t_melt - $t_ice ) *
            #        $r_pellet *
            #        $t_stop ) /
            #    ( $rho_ice * $Qs * $pi * $r_pellet**2 );
            #
            if (
                   $line_count > 2
                && $i_lowest >= 0    # and we saw a possible break
                && $i_lowest < $i_test
                && $i_test > $imax - 2
                && $nesting_depth_to_go[$i_begin] >
                $nesting_depth_to_go[$i_lowest]
                && $lowest_strength < $last_break_strength - .5 * WEAK
              )
            {
                # Make this break for math operators for now
                my $ir = $inext_to_go[$i_lowest];
                my $il = iprev_to_go($ir);
                if (   $types_to_go[$il] =~ /^[\/\*\+\-\%]$/
                    || $types_to_go[$ir] =~ /^[\/\*\+\-\%]$/ )
                {
                    DEBUG_BREAK_LINES && do {
                        $Msg .= " :last-noskip_short";
                    };
                    last;
                }
            }

            # Update the minimum bond strength location
            $lowest_strength = $strength;
            $i_lowest        = $i_test;
            if ($must_break) {
                DEBUG_BREAK_LINES && do {
                    $Msg .= " :last-must_break";
                };
                last;
            }

            # set flags to remember if a break here will produce a
            # leading alignment of certain common tokens
            if (   $line_count > 0
                && $i_test < $imax
                && ( $lowest_strength - $last_break_strength <= MAX_BIAS ) )
            {
                my $i_last_end = iprev_to_go($i_begin);
                my $tok_beg    = $tokens_to_go[$i_begin];
                my $type_beg   = $types_to_go[$i_begin];
                if (

                    # check for leading alignment of certain tokens
                    (
                           $tok_beg eq $next_nonblank_token
                        && $is_chain_operator{$tok_beg}
                        && (   $type_beg eq 'k'
                            || $type_beg eq $tok_beg )
                        && $nesting_depth_to_go[$i_begin] >=
                        $nesting_depth_to_go[$i_next_nonblank]
                    )

                    || (   $tokens_to_go[$i_last_end] eq $token
                        && $is_chain_operator{$token}
                        && ( $type eq 'k' || $type eq $token )
                        && $nesting_depth_to_go[$i_last_end] >=
                        $nesting_depth_to_go[$i_test] )
                  )
                {
                    $leading_alignment_type = $next_nonblank_type;
                }
            }
        }

        #-----------------------------------------------------------
        # Section D: See if the maximum line length will be exceeded
        #-----------------------------------------------------------

        # Quit if there are no more tokens to test
        last if ( $i_test >= $imax );

        # Keep going if we have not reached the limit
        my $excess =
          $leading_spaces +
          $summed_lengths_to_go[ $i_test + 2 ] -
          $starting_sum -
          $maximum_line_length;

        if ( $excess < 0 ) {
            next;
        }
        elsif ( $excess == 0 ) {

            # To prevent blinkers we will avoid leaving a token exactly at
            # the line length limit unless it is the last token or one of
            # several "good" types.
            #
            # The following code was a blinker with -pbp before this
            # modification:
            #     $last_nonblank_token eq '('
            #         && $is_indirect_object_taker{ $paren_type
            #             [$paren_depth] }
            # The issue causing the problem is that if the
            # term [$paren_depth] gets broken across a line then
            # the whitespace routine doesn't see both opening and closing
            # brackets and will format like '[ $paren_depth ]'.  This
            # leads to an oscillation in length depending if we break
            # before the closing bracket or not.
            if (   $i_test + 1 < $imax
                && $next_nonblank_type ne ','
                && !$is_closing_type{$next_nonblank_type} )
            {
                # too long
                DEBUG_BREAK_LINES && do {
                    $Msg .= " :too_long";
                }
            }
            else {
                next;
            }
        }
        else {
            # too long
        }

        # a break here makes the line too long ...

        DEBUG_BREAK_LINES && do {
            my $ltok = $token;
            my $rtok =
              $next_nonblank_token ? $next_nonblank_token : EMPTY_STRING;
            my $i_testp2 = $i_test + 2;
            if ( $i_testp2 > $max_index_to_go + 1 ) {
                $i_testp2 = $max_index_to_go + 1;
            }
            if ( length($ltok) > 6 ) { $ltok = substr( $ltok, 0, 8 ) }
            if ( length($rtok) > 6 ) { $rtok = substr( $rtok, 0, 8 ) }
            print {*STDOUT}
"BREAK: i=$i_test imax=$imax $types_to_go[$i_test] $next_nonblank_type sp=($leading_spaces) lnext= $summed_lengths_to_go[$i_testp2] str=$strength    $ltok $rtok\n";
        };

        # Exception: allow one extra terminal token after exceeding line length
        # if it would strand this token.
        if (   $i_lowest == $i_test
            && $token_lengths_to_go[$i_test] > 1
            && ( $next_nonblank_type eq ';' || $next_nonblank_type eq ',' )
            && $rOpts_fuzzy_line_length )
        {
            DEBUG_BREAK_LINES && do {
                $Msg .= " :do_not_strand next='$next_nonblank_type'";
            };
            next;
        }

        # Stop if here if we have a solution and the line will be too long
        if ( $i_lowest >= 0 ) {
            DEBUG_BREAK_LINES && do {
                $Msg .=
" :Done-too_long && i_lowest=$i_lowest at itest=$i_test, imax=$imax";
            };
            last;
        }
    }

    #-----------------------------------------------------
    # End INNER_LOOP over the indexes in the _to_go arrays
    #-----------------------------------------------------

    # Be sure we return an index in the range ($ibegin .. $imax).
    # We will break at imax if no other break was found.
    if ( $i_lowest < 0 ) { $i_lowest = $imax }

    return ( $i_lowest, $lowest_strength, $leading_alignment_type, $Msg );
} ## end sub break_lines_inner_loop

sub do_colon_breaks {
    my ( $self, $ri_colon_breaks, $ri_first, $ri_last ) = @_;

    # using a simple method for deciding if we are in a ?/: chain --
    # this is a chain if it has multiple ?/: pairs all in order;
    # otherwise not.
    # Note that if line starts in a ':' we count that above as a break

    my @insert_list = ();
    foreach ( @{$ri_colon_breaks} ) {
        my $i_question = $mate_index_to_go[$_];
        if ( defined($i_question) ) {
            if ( $want_break_before{'?'} ) {
                $i_question = iprev_to_go($i_question);
            }

            if ( $i_question >= 0 ) {
                push @insert_list, $i_question;
            }
        }
        $self->insert_additional_breaks( \@insert_list, $ri_first, $ri_last );
    }
    return;
} ## end sub do_colon_breaks

###########################################
# CODE SECTION 11: Code to break long lists
###########################################

{    ## begin closure break_lists

    # These routines and variables are involved in finding good
    # places to break long lists.

    use constant DEBUG_BREAK_LISTS => 0;

    my (

        $block_type,
        $current_depth,
        $depth,
        $i,
        $i_last_colon,
        $i_line_end,
        $i_line_start,
        $i_last_nonblank_token,
        $last_nonblank_block_type,
        $last_nonblank_token,
        $last_nonblank_type,
        $last_old_breakpoint_count,
        $minimum_depth,
        $next_nonblank_block_type,
        $next_nonblank_token,
        $next_nonblank_type,
        $old_breakpoint_count,
        $starting_breakpoint_count,
        $starting_depth,
        $token,
        $type,
        $type_sequence,

    );

    my (

        @breakpoint_stack,
        @breakpoint_undo_stack,
        @comma_index,
        @container_type,
        @identifier_count_stack,
        @index_before_arrow,
        @interrupted_list,
        @item_count_stack,
        @last_comma_index,
        @last_dot_index,
        @last_nonblank_type,
        @old_breakpoint_count_stack,
        @opening_structure_index_stack,
        @rfor_semicolon_list,
        @has_old_logical_breakpoints,
        @rand_or_list,
        @i_equals,
        @override_cab3,
        @type_sequence_stack,

    );

    # these arrays must retain values between calls
    my ( @has_broken_sublist, @dont_align, @want_comma_break );

    my $length_tol;
    my $lp_tol_boost;

    sub initialize_break_lists {
        @dont_align         = ();
        @has_broken_sublist = ();
        @want_comma_break   = ();

        #---------------------------------------------------
        # Set tolerances to prevent formatting instabilities
        #---------------------------------------------------

        # Define tolerances to use when checking if closed
        # containers will fit on one line.  This is necessary to avoid
        # formatting instability. The basic tolerance is based on the
        # following:

        # - Always allow for at least one extra space after a closing token so
        # that we do not strand a comma or semicolon. (oneline.t).

        # - Use an increased line length tolerance when -ci > -i to avoid
        # blinking states (case b923 and others).
        $length_tol =
          1 + max( 0, $rOpts_continuation_indentation - $rOpts_indent_columns );

        # In addition, it may be necessary to use a few extra tolerance spaces
        # when -lp is used and/or when -xci is used.  The history of this
        # so far is as follows:

        # FIX1: At least 3 characters were been found to be required for -lp
        # to fixes cases b1059 b1063 b1117.

        # FIX2: Further testing showed that we need a total of 3 extra spaces
        # when -lp is set for non-lists, and at least 2 spaces when -lp and
        # -xci are set.
        # Fixes cases b1063 b1103 b1134 b1135 b1136 b1138 b1140 b1143 b1144
        # b1145 b1146 b1147 b1148 b1151 b1152 b1153 b1154 b1156 b1157 b1164
        # b1165

        # FIX3: To fix cases b1169 b1170 b1171, an update was made in sub
        # 'find_token_starting_list' to go back before an initial blank space.
        # This fixed these three cases, and allowed the tolerances to be
        # reduced to continue to fix all other known cases of instability.
        # This gives the current tolerance formulation.

        $lp_tol_boost = 0;

        if ($rOpts_line_up_parentheses) {

            # boost tol for combination -lp -xci
            if ($rOpts_extended_continuation_indentation) {
                $lp_tol_boost = 2;
            }

            # boost tol for combination -lp and any -vtc > 0, but only for
            # non-list containers
            else {
                foreach ( keys %closing_vertical_tightness ) {
                    next
                      unless ( $closing_vertical_tightness{$_} );
                    $lp_tol_boost = 1;    # Fixes B1193;
                    last;
                }
            }
        }

        # Define a level where list formatting becomes highly stressed and
        # needs to be simplified. Introduced for case b1262.
        # $list_stress_level = min($stress_level_alpha, $stress_level_beta + 2);
        # This is now '$high_stress_level'.

        return;
    } ## end sub initialize_break_lists

    # routine to define essential variables when we go 'up' to
    # a new depth
    sub check_for_new_minimum_depth {
        my ( $self, $depth_t, $seqno ) = @_;
        if ( $depth_t < $minimum_depth ) {

            $minimum_depth = $depth_t;

            # these arrays need not retain values between calls
            my $old_seqno     = $type_sequence_stack[$depth_t];
            my $changed_seqno = !defined($old_seqno) || $old_seqno != $seqno;
            $type_sequence_stack[$depth_t] = $seqno;
            $override_cab3[$depth_t]       = undef;
            if ( $rOpts_comma_arrow_breakpoints == 3 && $seqno ) {
                $override_cab3[$depth_t] = $self->[_roverride_cab3_]->{$seqno};
            }
            $breakpoint_stack[$depth_t]       = $starting_breakpoint_count;
            $container_type[$depth_t]         = EMPTY_STRING;
            $identifier_count_stack[$depth_t] = 0;
            $index_before_arrow[$depth_t]     = -1;
            $interrupted_list[$depth_t]       = 1;
            $item_count_stack[$depth_t]       = 0;
            $last_nonblank_type[$depth_t]     = EMPTY_STRING;
            $opening_structure_index_stack[$depth_t] = -1;

            $breakpoint_undo_stack[$depth_t]       = undef;
            $comma_index[$depth_t]                 = undef;
            $last_comma_index[$depth_t]            = undef;
            $last_dot_index[$depth_t]              = undef;
            $old_breakpoint_count_stack[$depth_t]  = undef;
            $has_old_logical_breakpoints[$depth_t] = 0;
            $rand_or_list[$depth_t]                = [];
            $rfor_semicolon_list[$depth_t]         = [];
            $i_equals[$depth_t]                    = -1;

            # these arrays must retain values between calls
            if ( $changed_seqno || !defined( $has_broken_sublist[$depth_t] ) ) {
                $dont_align[$depth_t]         = 0;
                $has_broken_sublist[$depth_t] = 0;
                $want_comma_break[$depth_t]   = 0;
            }
        }
        return;
    } ## end sub check_for_new_minimum_depth

    # routine to decide which commas to break at within a container;
    # returns:
    #   $bp_count = number of comma breakpoints set
    #   $do_not_break_apart = a flag indicating if container need not
    #     be broken open
    sub set_comma_breakpoints {

        my ( $self, $dd, $rbond_strength_bias ) = @_;
        my $bp_count           = 0;
        my $do_not_break_apart = 0;

        # anything to do?
        if ( $item_count_stack[$dd] ) {

            # Do not break a list unless there are some non-line-ending commas.
            # This avoids getting different results with only non-essential
            # commas, and fixes b1192.
            my $seqno = $type_sequence_stack[$dd];

            my $real_comma_count =
              $seqno ? $self->[_rtype_count_by_seqno_]->{$seqno}->{','} : 1;

            # handle commas not in containers...
            if ( $dont_align[$dd] ) {
                $self->do_uncontained_comma_breaks( $dd, $rbond_strength_bias );
            }

            # handle commas within containers...
            elsif ($real_comma_count) {
                my $fbc = $forced_breakpoint_count;

                # always open comma lists not preceded by keywords,
                # barewords, identifiers (that is, anything that doesn't
                # look like a function call)
                # c250: added new sub identifier type 'S'
                my $must_break_open = $last_nonblank_type[$dd] !~ /^[kwiUS]$/;

                $self->table_maker(
                    {
                        depth            => $dd,
                        i_opening_paren  => $opening_structure_index_stack[$dd],
                        i_closing_paren  => $i,
                        item_count       => $item_count_stack[$dd],
                        identifier_count => $identifier_count_stack[$dd],
                        rcomma_index     => $comma_index[$dd],
                        next_nonblank_type  => $next_nonblank_type,
                        list_type           => $container_type[$dd],
                        interrupted         => $interrupted_list[$dd],
                        rdo_not_break_apart => \$do_not_break_apart,
                        must_break_open     => $must_break_open,
                        has_broken_sublist  => $has_broken_sublist[$dd],
                    }
                );
                $bp_count           = $forced_breakpoint_count - $fbc;
                $do_not_break_apart = 0 if $must_break_open;
            }
            else {
                ## no real commas, nothing to do
            }
        }
        return ( $bp_count, $do_not_break_apart );
    } ## end sub set_comma_breakpoints

    # These types are excluded at breakpoints to prevent blinking
    # Switched from excluded to included as part of fix for b1214
    my %is_uncontained_comma_break_included_type;

    BEGIN {

        my @q = qw< k R } ) ] Y Z U w i q Q .
          = **= += *= &= <<= &&= -= /= |= >>= ||= //= .= %= ^= x=>;
        @is_uncontained_comma_break_included_type{@q} = (1) x scalar(@q);
    } ## end BEGIN

    sub do_uncontained_comma_breaks {

        # Handle commas not in containers...
        # This is a catch-all routine for commas that we
        # don't know what to do with because the don't fall
        # within containers.  We will bias the bond strength
        # to break at commas which ended lines in the input
        # file.  This usually works better than just trying
        # to put as many items on a line as possible.  A
        # downside is that if the input file is garbage it
        # won't work very well. However, the user can always
        # prevent following the old breakpoints with the
        # -iob flag.
        my ( $self, $dd, $rbond_strength_bias ) = @_;

        # Check added for issue c131; an error here would be due to an
        # error initializing @comma_index when entering depth $dd.
        if (DEVEL_MODE) {
            foreach my $ii ( @{ $comma_index[$dd] } ) {
                if ( $ii < 0 || $ii > $max_index_to_go ) {
                    my $KK  = $K_to_go[0];
                    my $lno = $self->[_rLL_]->[$KK]->[_LINE_INDEX_];
                    Fault(<<EOM);
Bad comma index near line $lno: i=$ii must be between 0 and $max_index_to_go
EOM
                }
            }
        }

        my $bias                  = -.01;
        my $old_comma_break_count = 0;
        foreach my $ii ( @{ $comma_index[$dd] } ) {

            if ( $old_breakpoint_to_go[$ii] ) {
                $old_comma_break_count++;

                # Store the bias info for use by sub set_bond_strength
                push @{$rbond_strength_bias}, [ $ii, $bias ];

                # reduce bias magnitude to force breaks in order
                $bias *= 0.99;
            }
        }

        # Also put a break before the first comma if
        # (1) there was a break there in the input, and
        # (2) there was exactly one old break before the first comma break
        # (3) OLD: there are multiple old comma breaks
        # (3) NEW: there are one or more old comma breaks (see return example)
        # (4) the first comma is at the starting level ...
        #     ... fixes cases b064 b065 b068 b210 b747
        # (5) the batch does not start with a ci>0 [ignore a ci change by -xci]
        #     ... fixes b1220.  If ci>0 we are in the middle of a snippet,
        #     maybe because -boc has been forcing out previous lines.

        # For example, we will follow the user and break after
        # 'print' in this snippet:
        #    print
        #      "conformability (Not the same dimension)\n",
        #      "\t", $have, " is ", text_unit($hu), "\n",
        #      "\t", $want, " is ", text_unit($wu), "\n",
        #      ;
        #
        # Another example, just one comma, where we will break after
        # the return:
        #  return
        #    $x * cos($a) - $y * sin($a),
        #    $x * sin($a) + $y * cos($a);

        # Breaking a print statement:
        # print SAVEOUT
        #   ( $? & 127 ) ? " (SIG#" . ( $? & 127 ) . ")" : "",
        #   ( $? & 128 ) ? " -- core dumped" : "", "\n";
        #
        #  But we will not force a break after the opening paren here
        #  (causes a blinker):
        #        $heap->{stream}->set_output_filter(
        #            poe::filter::reference->new('myotherfreezer') ),
        #          ;
        #
        my $i_first_comma = $comma_index[$dd]->[0];
        my $level_comma   = $levels_to_go[$i_first_comma];
        my $ci_start      = $ci_levels_to_go[0];

        # Here we want to use the value of ci before any -xci adjustment
        if ( $ci_start && $rOpts_extended_continuation_indentation ) {
            my $K0 = $K_to_go[0];
            if ( $self->[_rseqno_controlling_my_ci_]->{$K0} ) { $ci_start = 0 }
        }
        if (  !$ci_start
            && $old_breakpoint_to_go[$i_first_comma]
            && $level_comma == $levels_to_go[0] )
        {
            my $ibreak    = -1;
            my $obp_count = 0;
            foreach my $ii ( reverse( 0 .. $i_first_comma - 1 ) ) {
                if ( $old_breakpoint_to_go[$ii] ) {
                    $obp_count++;
                    last if ( $obp_count > 1 );
                    $ibreak = $ii
                      if ( $levels_to_go[$ii] == $level_comma );
                }
            }

            # Changed rule from multiple old commas to just one here:
            if ( $ibreak >= 0 && $obp_count == 1 && $old_comma_break_count > 0 )
            {
                my $ibreak_m = $ibreak;
                $ibreak_m-- if ( $types_to_go[$ibreak_m] eq 'b' );
                if ( $ibreak_m >= 0 ) {

                    # In order to avoid blinkers we have to be fairly
                    # restrictive:

                    # OLD Rules:
                    #  Rule 1: Do not to break before an opening token
                    #  Rule 2: avoid breaking at ternary operators
                    #  (see b931, which is similar to the above print example)
                    #  Rule 3: Do not break at chain operators to fix case b1119
                    #   - The previous test was '$typem !~ /^[\(\{\[L\?\:]$/'

                    # NEW Rule, replaced above rules after case b1214:
                    #  only break at one of the included types

                    # Be sure to test any changes to these rules against runs
                    # with -l=0 such as the 'bbvt' test (perltidyrc_colin)
                    # series.
                    my $type_m = $types_to_go[$ibreak_m];

                    # Switched from excluded to included for b1214. If necessary
                    # the token could also be checked if type_m eq 'k'
                    if ( $is_uncontained_comma_break_included_type{$type_m} ) {

                        # Rule added to fix b1449:
                        # Do not break before a '?' if -nbot is set
                        # Otherwise, we may alternately arrive here and
                        # set the break, or not, depending on the input.
                        my $no_break;
                        my $ibreak_p = $inext_to_go[$ibreak_m];
                        if (  !$rOpts_break_at_old_ternary_breakpoints
                            && $ibreak_p <= $max_index_to_go )
                        {
                            my $type_p = $types_to_go[$ibreak_p];
                            $no_break = $type_p eq '?';
                        }

                        $self->set_forced_breakpoint($ibreak)
                          if ( !$no_break );
                    }
                }
            }
        }
        return;
    } ## end sub do_uncontained_comma_breaks

    my %is_logical_container;
    my %quick_filter;

    BEGIN {
        my @q = qw# if elsif unless while and or err not && | || ? : ! #;
        @is_logical_container{@q} = (1) x scalar(@q);

        # This filter will allow most tokens to skip past a section of code
        %quick_filter = %is_assignment;
        @q            = qw# => . ; < > ~ #;
        push @q, ',';
        push @q, 'f';    # added for ';' for issue c154
        @quick_filter{@q} = (1) x scalar(@q);
    } ## end BEGIN

    sub set_for_semicolon_breakpoints {
        my ( $self, $dd ) = @_;

        # Set breakpoints for semicolons in C-style 'for' containers
        foreach ( @{ $rfor_semicolon_list[$dd] } ) {
            $self->set_forced_breakpoint($_);
        }
        return;
    } ## end sub set_for_semicolon_breakpoints

    sub set_logical_breakpoints {
        my ( $self, $dd ) = @_;

        # Set breakpoints at logical operators
        if (
               $item_count_stack[$dd] == 0
            && $is_logical_container{ $container_type[$dd] }

            || $has_old_logical_breakpoints[$dd]
          )
        {

            # Look for breaks in this order:
            # 0   1    2   3
            # or  and  ||  &&
            foreach my $i ( 0 .. 3 ) {
                if ( $rand_or_list[$dd][$i] ) {
                    foreach ( @{ $rand_or_list[$dd][$i] } ) {
                        $self->set_forced_breakpoint($_);
                    }

                    # break at any 'if' and 'unless' too
                    foreach ( @{ $rand_or_list[$dd][4] } ) {
                        $self->set_forced_breakpoint($_);
                    }
                    $rand_or_list[$dd] = [];
                    last;
                }
            }
        }
        return;
    } ## end sub set_logical_breakpoints

    sub is_unbreakable_container {

        # never break a container of one of these types
        # because bad things can happen (map1.t)
        my $dd = shift;
        return $is_sort_map_grep{ $container_type[$dd] };
    } ## end sub is_unbreakable_container

    sub break_lists {

        my ( $self, $is_long_line, $rbond_strength_bias ) = @_;

        #--------------------------------------------------------------------
        # This routine is called once per batch, if the batch is a list, to
        # set line breaks so that hierarchical structure can be displayed and
        # so that list items can be vertically aligned.  The output of this
        # routine is stored in the array @forced_breakpoint_to_go, which is
        # used by sub 'break_long_lines' to set final breakpoints.  This is
        # probably the most complex routine in perltidy, so I have
        # broken it into pieces and over-commented it.
        #--------------------------------------------------------------------

        $starting_depth = $nesting_depth_to_go[0];

        $block_type                = SPACE;
        $current_depth             = $starting_depth;
        $i                         = -1;
        $i_last_colon              = -1;
        $i_line_end                = -1;
        $i_line_start              = -1;
        $last_nonblank_token       = ';';
        $last_nonblank_type        = ';';
        $last_nonblank_block_type  = SPACE;
        $last_old_breakpoint_count = 0;
        $minimum_depth = $current_depth + 1;    # forces update in check below
        $old_breakpoint_count      = 0;
        $starting_breakpoint_count = $forced_breakpoint_count;
        $token                     = ';';
        $type                      = ';';
        $type_sequence             = EMPTY_STRING;

        my $total_depth_variation = 0;
        my $i_old_assignment_break;
        my $depth_last = $starting_depth;
        my $comma_follows_last_closing_token;

        $self->check_for_new_minimum_depth( $current_depth,
            $parent_seqno_to_go[0] )
          if ( $current_depth < $minimum_depth );

        my $i_want_previous_break = -1;

        my $saw_good_breakpoint;

        #----------------------------------------
        # Main loop over all tokens in this batch
        #----------------------------------------
        while ( ++$i <= $max_index_to_go ) {
            if ( $type ne 'b' ) {
                $i_last_nonblank_token    = $i - 1;
                $last_nonblank_type       = $type;
                $last_nonblank_token      = $token;
                $last_nonblank_block_type = $block_type;
            }
            $type          = $types_to_go[$i];
            $block_type    = $block_type_to_go[$i];
            $token         = $tokens_to_go[$i];
            $type_sequence = $type_sequence_to_go[$i];

            my $i_next_nonblank = $inext_to_go[$i];
            $next_nonblank_type       = $types_to_go[$i_next_nonblank];
            $next_nonblank_token      = $tokens_to_go[$i_next_nonblank];
            $next_nonblank_block_type = $block_type_to_go[$i_next_nonblank];

            #-------------------------------------------
            # Loop Section A: Look for special breakpoints...
            #-------------------------------------------

            # set break if flag was set
            if ( $i_want_previous_break >= 0 ) {
                $self->set_forced_breakpoint($i_want_previous_break);
                $i_want_previous_break = -1;
            }

            $last_old_breakpoint_count = $old_breakpoint_count;

            # Check for a good old breakpoint ..
            if ( $old_breakpoint_to_go[$i] ) {
                ( $i_want_previous_break, $i_old_assignment_break ) =
                  $self->examine_old_breakpoint( $i_next_nonblank,
                    $i_want_previous_break, $i_old_assignment_break );
            }

            next if ( $type eq 'b' );

            $depth = $nesting_depth_to_go[ $i + 1 ];

            $total_depth_variation += abs( $depth - $depth_last );
            $depth_last = $depth;

            # safety check - be sure we always break after a comment
            # Shouldn't happen .. an error here probably means that the
            # nobreak flag did not get turned off correctly during
            # formatting.
            if ( $type eq '#' ) {
                if ( $i != $max_index_to_go ) {
                    if (DEVEL_MODE) {
                        Fault(<<EOM);
Non-fatal program bug: backup logic required to break after a comment
EOM
                    }
                    $nobreak_to_go[$i] = 0;
                    $self->set_forced_breakpoint($i);
                } ## end if ( $i != $max_index_to_go)
            } ## end if ( $type eq '#' )

            # Force breakpoints at certain tokens in long lines.
            # Note that such breakpoints will be undone later if these tokens
            # are fully contained within parens on a line.
            if (

                # break before a keyword within a line
                $type eq 'k'
                && $i > 0

                # if one of these keywords:
                && $is_if_unless_while_until_for_foreach{$token}

                # but do not break at something like '1 while'
                && ( $last_nonblank_type ne 'n' || $i > 2 )

                # and let keywords follow a closing 'do' brace
                && (  !$last_nonblank_block_type
                    || $last_nonblank_block_type ne 'do' )

                && (
                    $is_long_line

                    # or container is broken (by side-comment, etc)
                    || (
                        $next_nonblank_token eq '('
                        && ( !defined( $mate_index_to_go[$i_next_nonblank] )
                            || $mate_index_to_go[$i_next_nonblank] < $i )
                    )
                )
              )
            {
                $self->set_forced_breakpoint( $i - 1 );
            }

            # remember locations of '||'  and '&&' for possible breaks if we
            # decide this is a long logical expression.
            if ( $type eq '||' ) {
                push @{ $rand_or_list[$depth][2] }, $i;
                ++$has_old_logical_breakpoints[$depth]
                  if ( ( $i == $i_line_start || $i == $i_line_end )
                    && $rOpts_break_at_old_logical_breakpoints );
            }
            elsif ( $type eq '&&' ) {
                push @{ $rand_or_list[$depth][3] }, $i;
                ++$has_old_logical_breakpoints[$depth]
                  if ( ( $i == $i_line_start || $i == $i_line_end )
                    && $rOpts_break_at_old_logical_breakpoints );
            }
            elsif ( $type eq 'f' ) {
                push @{ $rfor_semicolon_list[$depth] }, $i;
            }
            elsif ( $type eq 'k' ) {
                if ( $token eq 'and' ) {
                    push @{ $rand_or_list[$depth][1] }, $i;
                    ++$has_old_logical_breakpoints[$depth]
                      if ( ( $i == $i_line_start || $i == $i_line_end )
                        && $rOpts_break_at_old_logical_breakpoints );
                }

                # break immediately at 'or's which are probably not in a logical
                # block -- but we will break in logical breaks below so that
                # they do not add to the forced_breakpoint_count
                elsif ( $token eq 'or' ) {
                    push @{ $rand_or_list[$depth][0] }, $i;
                    ++$has_old_logical_breakpoints[$depth]
                      if ( ( $i == $i_line_start || $i == $i_line_end )
                        && $rOpts_break_at_old_logical_breakpoints );
                    if ( $is_logical_container{ $container_type[$depth] } ) {
                    }
                    else {
                        if ($is_long_line) { $self->set_forced_breakpoint($i) }
                        elsif ( ( $i == $i_line_start || $i == $i_line_end )
                            && $rOpts_break_at_old_logical_breakpoints )
                        {
                            $saw_good_breakpoint = 1;
                        }
                        else {
                            ## not a good break
                        }
                    }
                }
                elsif ( $token eq 'if' || $token eq 'unless' ) {
                    push @{ $rand_or_list[$depth][4] }, $i;
                    if ( ( $i == $i_line_start || $i == $i_line_end )
                        && $rOpts_break_at_old_logical_breakpoints )
                    {
                        $self->set_forced_breakpoint($i);
                    }
                }
                else {
                    ## not one of: 'and' 'or' 'if' 'unless'
                }
            }
            elsif ( $is_assignment{$type} ) {
                $i_equals[$depth] = $i;
            }
            else {
                ## not a good breakpoint type
            }

            #-----------------------------------------
            # Loop Section B: Handle a sequenced token
            #-----------------------------------------
            if ($type_sequence) {
                $self->break_lists_type_sequence;
            }

            #------------------------------------------
            # Loop Section C: Handle Increasing Depth..
            #------------------------------------------

            # hardened against bad input syntax: depth jump must be 1 and type
            # must be opening..fixes c102
            if ( $depth == $current_depth + 1 && $is_opening_type{$type} ) {
                $self->break_lists_increasing_depth();
            }

            #------------------------------------------
            # Loop Section D: Handle Decreasing Depth..
            #------------------------------------------

            # hardened against bad input syntax: depth jump must be 1 and type
            # must be closing .. fixes c102
            elsif ( $depth == $current_depth - 1 && $is_closing_type{$type} ) {

                $self->break_lists_decreasing_depth();

                $comma_follows_last_closing_token =
                  $next_nonblank_type eq ',' || $next_nonblank_type eq '=>';

            }
            else {
                ## not a depth change
            }

            #----------------------------------
            # Loop Section E: Handle this token
            #----------------------------------

            $current_depth = $depth;

            # most token types can skip the rest of this loop
            next if ( !$quick_filter{$type} );

            # Turn off comma alignment if we are sure that this is not a list
            # environment.  To be safe, we will do this if we see certain
            # non-list tokens, such as ';', '=', and also the environment is
            # not a list.
            ##      $type =~ /^[\;\<\>\~f]$/ || $is_assignment{$type}
            if ( $is_non_list_type{$type} ) {
                if ( !$self->is_in_list_by_i($i) ) {
                    $dont_align[$depth]         = 1;
                    $want_comma_break[$depth]   = 0;
                    $index_before_arrow[$depth] = -1;

                    # no special comma breaks in C-style 'for' terms (c154)
                    if ( $type eq 'f' ) { $last_comma_index[$depth] = undef }
                }
            }

            # handle any commas
            elsif ( $type eq ',' ) {
                $self->study_comma($comma_follows_last_closing_token);
            }

            # handle comma-arrow
            elsif ( $type eq '=>' ) {
                next if ( $last_nonblank_type eq '=>' );
                next if $rOpts_break_at_old_comma_breakpoints;
                next
                  if ( $rOpts_comma_arrow_breakpoints == 3
                    && !defined( $override_cab3[$depth] ) );
                $want_comma_break[$depth]   = 1;
                $index_before_arrow[$depth] = $i_last_nonblank_token;
                next;
            }

            elsif ( $type eq '.' ) {
                $last_dot_index[$depth] = $i;
            }

            else {

                # error : no code to handle a type in %quick_filter
                DEVEL_MODE && Fault(<<EOM);
Missing code to handle token type '$type' which is in the quick_filter
EOM
            }

        } ## end while ( ++$i <= $max_index_to_go)

        #-------------------------------------------
        # END of loop over all tokens in this batch
        # Now set breaks for any unfinished lists ..
        #-------------------------------------------

        foreach my $dd ( reverse( $minimum_depth .. $current_depth ) ) {

            $interrupted_list[$dd]   = 1;
            $has_broken_sublist[$dd] = 1 if ( $dd < $current_depth );
            $self->set_comma_breakpoints( $dd, $rbond_strength_bias )
              if ( $item_count_stack[$dd] );
            $self->set_logical_breakpoints($dd)
              if ( $has_old_logical_breakpoints[$dd] );
            $self->set_for_semicolon_breakpoints($dd);

            # break open container...
            my $i_opening = $opening_structure_index_stack[$dd];
            if ( defined($i_opening) && $i_opening >= 0 ) {

                my $no_break = (
                    is_unbreakable_container($dd)

                      # Avoid a break which would place an isolated ' or "
                      # on a line
                      || ( $type eq 'Q'
                        && $i_opening >= $max_index_to_go - 2
                        && ( $token eq "'" || $token eq '"' ) )
                );

                $self->set_forced_breakpoint($i_opening)
                  if ( !$no_break );
            }
        } ## end for ( my $dd = $current_depth...)

        #----------------------------------------
        # Return the flag '$saw_good_breakpoint'.
        #----------------------------------------
        # This indicates if the input file had some good breakpoints.  This
        # flag will be used to force a break in a line shorter than the
        # allowed line length.
        if ( $has_old_logical_breakpoints[$current_depth] ) {
            $saw_good_breakpoint = 1;
        }

        # A complex line with one break at an = has a good breakpoint.
        # This is not complex ($total_depth_variation=0):
        # $res1
        #   = 10;
        #
        # This is complex ($total_depth_variation=6):
        # $res2 =
        #  (is_boundp("a", 'self-insert') && is_boundp("b", 'self-insert'));

        # The check ($i_old_.. < $max_index_to_go) was added to fix b1333
        elsif ($i_old_assignment_break
            && $total_depth_variation > 4
            && $old_breakpoint_count == 1
            && $i_old_assignment_break < $max_index_to_go )
        {
            $saw_good_breakpoint = 1;
        }
        else {
            ## not a good breakpoint
        }

        return $saw_good_breakpoint;
    } ## end sub break_lists

    sub study_comma {

        # study and store info for a list comma

        my ( $self, $comma_follows_last_closing_token ) = @_;

        $last_dot_index[$depth]   = undef;
        $last_comma_index[$depth] = $i;

        # break here if this comma follows a '=>'
        # but not if there is a side comment after the comma
        if ( $want_comma_break[$depth] ) {

            if ( $next_nonblank_type =~ /^[\)\}\]R]$/ ) {
                if ($rOpts_comma_arrow_breakpoints) {
                    $want_comma_break[$depth] = 0;
                    return;
                }
            }

            $self->set_forced_breakpoint($i)
              unless ( $next_nonblank_type eq '#' );

            # break before the previous token if it looks safe
            # Example of something that we will not try to break before:
            #   DBI::SQL_SMALLINT() => $ado_consts->{adSmallInt},
            # Also we don't want to break at a binary operator (like +):
            # $c->createOval(
            #    $x + $R, $y +
            #    $R => $x - $R,
            #    $y - $R, -fill   => 'black',
            # );
            my $ibreak = $index_before_arrow[$depth] - 1;
            if (   $ibreak > 0
                && $tokens_to_go[ $ibreak + 1 ] !~ /^[\)\}\]]$/ )
            {
                if ( $tokens_to_go[$ibreak] eq '-' ) { $ibreak-- }
                if ( $types_to_go[$ibreak] eq 'b' )  { $ibreak-- }
                if ( $types_to_go[$ibreak] =~ /^[,wiZCUG\(\{\[]$/ ) {

                    # don't break before a comma, as in the following:
                    # ( LONGER_THAN,=> 1,
                    #    EIGHTY_CHARACTERS,=> 2,
                    #    CAUSES_FORMATTING,=> 3,
                    #    LIKE_THIS,=> 4,
                    # );
                    # This example is for -tso but should be general rule
                    if (   $tokens_to_go[ $ibreak + 1 ] ne '->'
                        && $tokens_to_go[ $ibreak + 1 ] ne ',' )
                    {
                        $self->set_forced_breakpoint($ibreak);
                    }
                }
            }

            $want_comma_break[$depth]   = 0;
            $index_before_arrow[$depth] = -1;

            # handle list which mixes '=>'s and ','s:
            # treat any list items so far as an interrupted list
            $interrupted_list[$depth] = 1;
            return;
        }

        # Break after all commas above starting depth...
        # But only if the last closing token was followed by a comma,
        #   to avoid breaking a list operator (issue c119)
        if (   $depth < $starting_depth
            && $comma_follows_last_closing_token
            && !$dont_align[$depth] )
        {
            $self->set_forced_breakpoint($i)
              unless ( $next_nonblank_type eq '#' );
            return;
        }

        # add this comma to the list..
        my $item_count = $item_count_stack[$depth];
        if ( $item_count == 0 ) {

            # but do not form a list with no opening structure
            # for example:

            #            open INFILE_COPY, ">$input_file_copy"
            #              or die ("very long message");
            if ( ( $opening_structure_index_stack[$depth] < 0 )
                && $self->is_in_block_by_i($i) )
            {
                $dont_align[$depth] = 1;
            }
        }

        $comma_index[$depth][$item_count] = $i;
        ++$item_count_stack[$depth];
        if ( $last_nonblank_type =~ /^[iR\]]$/ ) {
            $identifier_count_stack[$depth]++;
        }
        return;
    } ## end sub study_comma

    my %poor_types;
    my %poor_keywords;
    my %poor_next_types;
    my %poor_next_keywords;

    BEGIN {

        # Setup filters for detecting very poor breaks to ignore.
        # b1097: old breaks after type 'L' and before 'R' are poor
        # b1450: old breaks at 'eq' and related operators are poor
        my @q = qw(== <= >= !=);

        @{poor_types}{@q}      = (1) x scalar(@q);
        @{poor_next_types}{@q} = (1) x scalar(@q);
        $poor_types{'L'}      = 1;
        $poor_next_types{'R'} = 1;

        @q = qw(eq ne le ge lt gt);
        @{poor_keywords}{@q}      = (1) x scalar(@q);
        @{poor_next_keywords}{@q} = (1) x scalar(@q);
    } ## end BEGIN

    sub examine_old_breakpoint {

        my ( $self, $i_next_nonblank, $i_want_previous_break,
            $i_old_assignment_break )
          = @_;

        # Look at an old breakpoint and set/update certain flags:

        # Given indexes of three tokens in this batch:
        #   $i_next_nonblank        - index of the next nonblank token
        #   $i_want_previous_break  - we want a break before this index
        #   $i_old_assignment_break - the index of an '=' or equivalent
        # Update:
        #   $old_breakpoint_count   - a counter to increment unless poor break
        # Update and return:
        #   $i_want_previous_break
        #   $i_old_assignment_break

        #-----------------------
        # Filter out poor breaks
        #-----------------------
        # Just return if this is a poor break and pretend it does not exist.
        # Otherwise, poor breaks made under stress can cause instability.
        my $poor_break;
        if   ( $type eq 'k' ) { $poor_break ||= $poor_keywords{$token} }
        else                  { $poor_break ||= $poor_types{$type} }

        if ( $next_nonblank_type eq 'k' ) {
            $poor_break ||= $poor_next_keywords{$next_nonblank_token};
        }
        else { $poor_break ||= $poor_next_types{$next_nonblank_type} }

        # Also ignore any high stress level breaks; fixes b1395
        $poor_break ||= $levels_to_go[$i] >= $high_stress_level;
        if ($poor_break) { goto RETURN }

        #--------------------------------------------
        # Not a poor break, so continue to examine it
        #--------------------------------------------
        $old_breakpoint_count++;
        $i_line_end   = $i;
        $i_line_start = $i_next_nonblank;

        #---------------------------------------
        # Do we want to break before this token?
        #---------------------------------------

        # Break before certain keywords if user broke there and
        # this is a 'safe' break point. The idea is to retain
        # any preferred breaks for sequential list operations,
        # like a schwartzian transform.
        if ($rOpts_break_at_old_keyword_breakpoints) {
            if (
                   $next_nonblank_type eq 'k'
                && $is_keyword_returning_list{$next_nonblank_token}
                && (   $type =~ /^[=\)\]\}Riw]$/
                    || $type eq 'k' && $is_keyword_returning_list{$token} )
              )
            {

                # we actually have to set this break next time through
                # the loop because if we are at a closing token (such
                # as '}') which forms a one-line block, this break might
                # get undone.

                # But do not do this at an '=' if:
                # - the user wants breaks before an equals (b434 b903)
                # - or -naws is set (can be unstable, see b1354)
                my $skip = $type eq '='
                  && ( $want_break_before{$type}
                    || !$rOpts_add_whitespace );

                $i_want_previous_break = $i
                  unless ($skip);

            }
        }

        # Break before attributes if user broke there
        if ($rOpts_break_at_old_attribute_breakpoints) {
            if ( $next_nonblank_type eq 'A' ) {
                $i_want_previous_break = $i;
            }
        }

        #---------------------------------
        # Is this an old assignment break?
        #---------------------------------
        if ( $is_assignment{$type} ) {
            $i_old_assignment_break = $i;
        }
        elsif ( $is_assignment{$next_nonblank_type} ) {
            $i_old_assignment_break = $i_next_nonblank;
        }
        else {
            ## not old assignment break
        }

      RETURN:
        return ( $i_want_previous_break, $i_old_assignment_break );
    } ## end sub examine_old_breakpoint

    sub break_lists_type_sequence {

        my ($self) = @_;

        # We have encountered a sequenced token while setting list breakpoints

        # if closing type, one of } ) ] :
        if ( $is_closing_sequence_token{$token} ) {

            if ( $type eq ':' ) {
                $i_last_colon = $i;

                # retain break at a ':' line break
                if (   ( $i == $i_line_start || $i == $i_line_end )
                    && $rOpts_break_at_old_ternary_breakpoints
                    && $levels_to_go[$i] < $high_stress_level )
                {

                    $self->set_forced_breakpoint($i);

                    # Break at a previous '=', but only if it is before
                    # the mating '?'. Mate_index test fixes b1287.
                    my $ieq = $i_equals[$depth];
                    my $mix = $mate_index_to_go[$i];
                    if ( !defined($mix) ) { $mix = -1 }
                    if ( $ieq > 0 && $ieq < $mix ) {
                        $self->set_forced_breakpoint( $i_equals[$depth] );
                        $i_equals[$depth] = -1;
                    }
                }
            }

            # handle any postponed closing breakpoints
            if ( has_postponed_breakpoint($type_sequence) ) {
                my $inc = ( $type eq ':' ) ? 0 : 1;
                if ( $i >= $inc ) {
                    $self->set_forced_breakpoint( $i - $inc );
                }
            }
        }

        # must be opening token, one of { ( [ ?
        else {

            # set breaks at ?/: if they will get separated (and are
            # not a ?/: chain), or if the '?' is at the end of the
            # line
            if ( $token eq '?' ) {
                my $i_colon = $mate_index_to_go[$i];
                if (
                    !defined($i_colon) # the ':' is not in this batch
                    || $i == 0         # this '?' is the first token of the line
                    || $i == $max_index_to_go    # or this '?' is the last token
                  )
                {

                    # don't break if # this has a side comment, and
                    # don't break at a '?' if preceded by ':' on
                    # this line of previous ?/: pair on this line.
                    # This is an attempt to preserve a chain of ?/:
                    # expressions (elsif2.t).
                    if (
                        (
                               $i_last_colon < 0
                            || $parent_seqno_to_go[$i_last_colon] !=
                            $parent_seqno_to_go[$i]
                        )
                        && $tokens_to_go[$max_index_to_go] ne '#'
                      )
                    {
                        $self->set_forced_breakpoint($i);
                    }
                    $self->set_closing_breakpoint($i);
                }
            }

            # must be one of { ( [
            else {

                # do requested -lp breaks at the OPENING token for BROKEN
                # blocks.  NOTE: this can be done for both -lp and -xlp,
                # but only -xlp can really take advantage of this.  So this
                # is currently restricted to -xlp to avoid excess changes to
                # existing -lp formatting.
                if ( $rOpts_extended_line_up_parentheses
                    && !defined( $mate_index_to_go[$i] ) )
                {
                    my $lp_object =
                      $self->[_rlp_object_by_seqno_]->{$type_sequence};
                    if ($lp_object) {
                        my $K_begin_line = $lp_object->get_K_begin_line();
                        my $i_begin_line = $K_begin_line - $K_to_go[0];
                        $self->set_forced_lp_break( $i_begin_line, $i );
                    }
                }
            }
        }
        return;
    } ## end sub break_lists_type_sequence

    sub break_lists_increasing_depth {

        my ($self) = @_;

        #--------------------------------------------
        # prepare for a new list when depth increases
        # token $i is a '(','{', or '['
        #--------------------------------------------

        #----------------------------------------------------------
        # BEGIN initialize depth arrays
        # ... use the same order as sub check_for_new_minimum_depth
        #----------------------------------------------------------
        $type_sequence_stack[$depth] = $type_sequence;

        $override_cab3[$depth] = undef;
        if ( $rOpts_comma_arrow_breakpoints == 3 && $type_sequence ) {
            $override_cab3[$depth] =
              $self->[_roverride_cab3_]->{$type_sequence};
        }

        $breakpoint_stack[$depth] = $forced_breakpoint_count;
        $container_type[$depth] =

          #      k => && || ? : .
          $is_container_label_type{$last_nonblank_type}
          ? $last_nonblank_token
          : EMPTY_STRING;
        $identifier_count_stack[$depth]        = 0;
        $index_before_arrow[$depth]            = -1;
        $interrupted_list[$depth]              = 0;
        $item_count_stack[$depth]              = 0;
        $last_nonblank_type[$depth]            = $last_nonblank_type;
        $opening_structure_index_stack[$depth] = $i;

        $breakpoint_undo_stack[$depth]       = $forced_breakpoint_undo_count;
        $comma_index[$depth]                 = undef;
        $last_comma_index[$depth]            = undef;
        $last_dot_index[$depth]              = undef;
        $old_breakpoint_count_stack[$depth]  = $old_breakpoint_count;
        $has_old_logical_breakpoints[$depth] = 0;
        $rand_or_list[$depth]                = [];
        $rfor_semicolon_list[$depth]         = [];
        $i_equals[$depth]                    = -1;

        # if line ends here then signal closing token to break
        if ( $next_nonblank_type eq 'b' || $next_nonblank_type eq '#' ) {
            $self->set_closing_breakpoint($i);
        }

        # Not all lists of values should be vertically aligned..
        $dont_align[$depth] =

          # code BLOCKS are handled at a higher level
          ##( $block_type ne EMPTY_STRING )
          $block_type

          # certain paren lists
          || ( $type eq '(' ) && (

            # it does not usually look good to align a list of
            # identifiers in a parameter list, as in:
            #    my($var1, $var2, ...)
            # (This test should probably be refined, for now I'm just
            # testing for any keyword)
            ( $last_nonblank_type eq 'k' )

            # a trailing '(' usually indicates a non-list
            || ( $next_nonblank_type eq '(' )
          );
        $has_broken_sublist[$depth] = 0;
        $want_comma_break[$depth]   = 0;

        #----------------------------
        # END initialize depth arrays
        #----------------------------

        # patch to outdent opening brace of long if/for/..
        # statements (like this one).  See similar coding in
        # set_continuation breaks.  We have also catch it here for
        # short line fragments which otherwise will not go through
        # break_long_lines.
        if (
            $block_type

            # if we have the ')' but not its '(' in this batch..
            && ( $last_nonblank_token eq ')' )
            && !defined( $mate_index_to_go[$i_last_nonblank_token] )

            # and user wants brace to left
            && !$rOpts_opening_brace_always_on_right

            && ( $type eq '{' )     # should be true
            && ( $token eq '{' )    # should be true
          )
        {
            $self->set_forced_breakpoint( $i - 1 );
        }

        return;
    } ## end sub break_lists_increasing_depth

    sub break_lists_decreasing_depth {

        my ( $self, $rbond_strength_bias ) = @_;

        # We have arrived at a closing container token in sub break_lists:
        # the token at index $i is one of these: ')','}', ']'
        # A number of important breakpoints for this container can now be set
        # based on the information that we have collected. This includes:
        # - breaks at commas to format tables
        # - breaks at certain logical operators and other good breakpoints
        # - breaks at opening and closing containers if needed by selected
        #   formatting styles
        # These breaks are made by calling sub 'set_forced_breakpoint'

        $self->check_for_new_minimum_depth( $depth, $parent_seqno_to_go[$i] )
          if ( $depth < $minimum_depth );

        # force all outer logical containers to break after we see on
        # old breakpoint
        $has_old_logical_breakpoints[$depth] ||=
          $has_old_logical_breakpoints[$current_depth];

        # Patch to break between ') {' if the paren list is broken.
        # There is similar logic in break_long_lines for
        # non-broken lists.
        if (   $token eq ')'
            && $next_nonblank_block_type
            && $interrupted_list[$current_depth]
            && $next_nonblank_type eq '{'
            && !$rOpts_opening_brace_always_on_right )
        {
            $self->set_forced_breakpoint($i);
        }

#print "LISTY sees: i=$i type=$type  tok=$token  block=$block_type depth=$depth next=$next_nonblank_type next_block=$next_nonblank_block_type inter=$interrupted_list[$current_depth]\n";

        #-----------------------------------------------------------------
        # Set breaks at commas to display a table of values if appropriate
        #-----------------------------------------------------------------
        my ( $bp_count, $do_not_break_apart ) = ( 0, 0 );
        ( $bp_count, $do_not_break_apart ) =
          $self->set_comma_breakpoints( $current_depth, $rbond_strength_bias )
          if ( $item_count_stack[$current_depth] );

        #-----------------------------------------------------------
        # Now set flags needed to decide if we should break open the
        # container ... This is a long rambling section which has
        # grown over time to handle all situations.
        #-----------------------------------------------------------
        my $i_opening = $opening_structure_index_stack[$current_depth];
        my $saw_opening_structure = ( $i_opening >= 0 );
        my $lp_object;
        if ( $rOpts_line_up_parentheses && $saw_opening_structure ) {
            $lp_object = $self->[_rlp_object_by_seqno_]
              ->{ $type_sequence_to_go[$i_opening] };
        }

        # this term is long if we had to break at interior commas..
        my $is_long_term = $bp_count > 0;

        # If this is a short container with one or more comma arrows,
        # then we will mark it as a long term to open it if requested.
        # $rOpts_comma_arrow_breakpoints =
        #    0 - open only if comma precedes closing brace
        #    1 - stable: except for one line blocks
        #    2 - try to form 1 line blocks
        #    3 - ignore =>
        #    4 - always open up if vt=0
        #    5 - stable: even for one line blocks if vt=0

        my $cab_flag = $rOpts_comma_arrow_breakpoints;

        # replace -cab=3 if overriden
        if ( $cab_flag == 3 && $type_sequence ) {
            my $test_cab = $self->[_roverride_cab3_]->{$type_sequence};
            if ( defined($test_cab) ) { $cab_flag = $test_cab }
        }

        # PATCH: Modify the -cab flag if we are not processing a list:
        # We only want the -cab flag to apply to list containers, so
        # for non-lists we use the default and stable -cab=5 value.
        # Fixes case b939a.
        if ( $type_sequence && !$self->[_ris_list_by_seqno_]->{$type_sequence} )
        {
            $cab_flag = 5;
        }

        # Ignore old breakpoints when under stress.
        # Fixes b1203 b1204 as well as b1197-b1200.
        # But not if -lp: fixes b1264, b1265.  NOTE: rechecked with
        # b1264 to see if this check is still required at all, and
        # these still require a check, but at higher level beta+3
        # instead of beta:  b1193 b780
        if (   $saw_opening_structure
            && !$lp_object
            && $levels_to_go[$i_opening] >= $high_stress_level )
        {
            $cab_flag = 2;

            # Do not break hash braces under stress (fixes b1238)
            $do_not_break_apart ||= $types_to_go[$i_opening] eq 'L';

            # This option fixes b1235, b1237, b1240 with old and new
            # -lp, but formatting is nicer with next option.
            ## $is_long_term ||=
            ##  $levels_to_go[$i_opening] > $stress_level_beta + 1;

            # This option fixes b1240 but not b1235, b1237 with new -lp,
            # but this gives better formatting than the previous option.
            # TODO: see if stress_level_alpha should also be considered
            $do_not_break_apart ||=
              $levels_to_go[$i_opening] > $stress_level_beta;
        }

        if (  !$is_long_term
            && $saw_opening_structure
            && $is_opening_token{ $tokens_to_go[$i_opening] }
            && $index_before_arrow[ $depth + 1 ] > 0
            && !$opening_vertical_tightness{ $tokens_to_go[$i_opening] } )
        {
            $is_long_term =
                 $cab_flag == 4
              || $cab_flag == 0 && $last_nonblank_token eq ','
              || $cab_flag == 5 && $old_breakpoint_to_go[$i_opening];
        }

        # mark term as long if the length between opening and closing
        # parens exceeds allowed line length
        if ( !$is_long_term && $saw_opening_structure ) {

            my $i_opening_minus = $self->find_token_starting_list($i_opening);

            my $excess = $self->excess_line_length( $i_opening_minus, $i );

            # Use standard spaces for indentation of lists in -lp mode
            # if it gives a longer line length. This helps to avoid an
            # instability due to forming and breaking one-line blocks.
            # This fixes case b1314.
            my $indentation = $leading_spaces_to_go[$i_opening_minus];
            if ( ref($indentation)
                && $self->[_ris_broken_container_]->{$type_sequence} )
            {
                my $lp_spaces  = $indentation->get_spaces();
                my $std_spaces = $indentation->get_standard_spaces();
                my $diff       = $std_spaces - $lp_spaces;
                if ( $diff > 0 ) { $excess += $diff }
            }

            my $tol = $length_tol;

            # boost tol for an -lp container
            if (
                   $lp_tol_boost
                && $lp_object
                && ( $rOpts_extended_continuation_indentation
                    || !$self->[_ris_list_by_seqno_]->{$type_sequence} )
              )
            {
                $tol += $lp_tol_boost;
            }

            # Patch to avoid blinking with -bbxi=2 and -cab=2
            # in which variations in -ci cause unstable formatting
            # in edge cases. We just always add one ci level so that
            # the formatting is independent of the -BBX results.
            # Fixes cases b1137 b1149 b1150 b1155 b1158 b1159 b1160
            # b1161 b1166 b1167 b1168
            if (  !$ci_levels_to_go[$i_opening]
                && $self->[_rbreak_before_container_by_seqno_]->{$type_sequence}
              )
            {
                $tol += $rOpts_continuation_indentation;
            }

            $is_long_term = $excess + $tol > 0;

        }

        # We've set breaks after all comma-arrows.  Now we have to
        # undo them if this can be a one-line block
        # (the only breakpoints set will be due to comma-arrows)

        if (

            # user doesn't require breaking after all comma-arrows
            ( $cab_flag != 0 ) && ( $cab_flag != 4 )

            # and if the opening structure is in this batch
            && $saw_opening_structure

            # and either on the same old line
            && (
                $old_breakpoint_count_stack[$current_depth] ==
                $last_old_breakpoint_count

                # or user wants to form long blocks with arrows
                || $cab_flag == 2
            )

            # and we made breakpoints between the opening and closing
            && ( $breakpoint_undo_stack[$current_depth] <
                $forced_breakpoint_undo_count )

            # and this block is short enough to fit on one line
            # Note: use < because need 1 more space for possible comma
            && !$is_long_term

          )
        {
            $self->undo_forced_breakpoint_stack(
                $breakpoint_undo_stack[$current_depth] );
        }

        # now see if we have any comma breakpoints left
        my $has_comma_breakpoints =
          ( $breakpoint_stack[$current_depth] != $forced_breakpoint_count );

        # update broken-sublist flag of the outer container
        $has_broken_sublist[$depth] =
             $has_broken_sublist[$depth]
          || $has_broken_sublist[$current_depth]
          || $is_long_term
          || $has_comma_breakpoints;

        # Having come to the closing ')', '}', or ']', now we have to decide
        # if we should 'open up' the structure by placing breaks at the
        # opening and closing containers.  This is a tricky decision.  Here
        # are some of the basic considerations:
        #
        # -If this is a BLOCK container, then any breakpoints will have
        # already been set (and according to user preferences), so we need do
        # nothing here.
        #
        # -If we have a comma-separated list for which we can align the list
        # items, then we need to do so because otherwise the vertical aligner
        # cannot currently do the alignment.
        #
        # -If this container does itself contain a container which has been
        # broken open, then it should be broken open to properly show the
        # structure.
        #
        # -If there is nothing to align, and no other reason to break apart,
        # then do not do it.
        #
        # We will not break open the parens of a long but 'simple' logical
        # expression.  For example:
        #
        # This is an example of a simple logical expression and its formatting:
        #
        #     if ( $bigwasteofspace1 && $bigwasteofspace2
        #         || $bigwasteofspace3 && $bigwasteofspace4 )
        #
        # Most people would prefer this than the 'spacey' version:
        #
        #     if (
        #         $bigwasteofspace1 && $bigwasteofspace2
        #         || $bigwasteofspace3 && $bigwasteofspace4
        #     )
        #
        # To illustrate the rules for breaking logical expressions, consider:
        #
        #             FULLY DENSE:
        #             if ( $opt_excl
        #                 and ( exists $ids_excl_uc{$id_uc}
        #                     or grep $id_uc =~ /$_/, @ids_excl_uc ))
        #
        # This is on the verge of being difficult to read.  The current
        # default is to open it up like this:
        #
        #             DEFAULT:
        #             if (
        #                 $opt_excl
        #                 and ( exists $ids_excl_uc{$id_uc}
        #                     or grep $id_uc =~ /$_/, @ids_excl_uc )
        #               )
        #
        # This is a compromise which tries to avoid being too dense and to
        # spacey.  A more spaced version would be:
        #
        #             SPACEY:
        #             if (
        #                 $opt_excl
        #                 and (
        #                     exists $ids_excl_uc{$id_uc}
        #                     or grep $id_uc =~ /$_/, @ids_excl_uc
        #                 )
        #               )
        #
        # Some people might prefer the spacey version -- an option could be
        # added.  The innermost expression contains a long block '( exists
        # $ids_...  ')'.
        #
        # Here is how the logic goes: We will force a break at the 'or' that
        # the innermost expression contains, but we will not break apart its
        # opening and closing containers because (1) it contains no
        # multi-line sub-containers itself, and (2) there is no alignment to
        # be gained by breaking it open like this
        #
        #             and (
        #                 exists $ids_excl_uc{$id_uc}
        #                 or grep $id_uc =~ /$_/, @ids_excl_uc
        #             )
        #
        # (although this looks perfectly ok and might be good for long
        # expressions).  The outer 'if' container, though, contains a broken
        # sub-container, so it will be broken open to avoid too much density.
        # Also, since it contains no 'or's, there will be a forced break at
        # its 'and'.

        # Handle the experimental flag --break-open-compact-parens
        # NOTE: This flag is not currently used and may eventually be removed.
        # If this flag is set, we will implement it by
        # pretending we did not see the opening structure, since in that case
        # parens always get opened up.
        if (   $saw_opening_structure
            && $rOpts_break_open_compact_parens )
        {

            # This parameter is a one-character flag, as follows:
            #  '0' matches no parens  -> break open NOT OK
            #  '1' matches all parens -> break open OK
            #  Other values are same as used by the weld-exclusion-list
            my $flag = $rOpts_break_open_compact_parens;
            if (   $flag eq '*'
                || $flag eq '1' )
            {
                $saw_opening_structure = 0;
            }
            else {

                # NOTE: $seqno will be equal to closure var $type_sequence here
                my $seqno = $type_sequence_to_go[$i_opening];
                $saw_opening_structure =
                  !$self->match_paren_control_flag( $seqno, $flag );
            }
        }

        # Set some more flags telling something about this container..
        my $is_simple_logical_expression;
        if (   $item_count_stack[$current_depth] == 0
            && $saw_opening_structure
            && $tokens_to_go[$i_opening] eq '('
            && $is_logical_container{ $container_type[$current_depth] } )
        {

            # This seems to be a simple logical expression with
            # no existing breakpoints.  Set a flag to prevent
            # opening it up.
            if ( !$has_comma_breakpoints ) {
                $is_simple_logical_expression = 1;
            }

            #---------------------------------------------------
            # This seems to be a simple logical expression with
            # breakpoints (broken sublists, for example).  Break
            # at all 'or's and '||'s.
            #---------------------------------------------------
            else {
                $self->set_logical_breakpoints($current_depth);
            }
        }

        # break long terms at any C-style for semicolons (c154)
        if ( $is_long_term
            && @{ $rfor_semicolon_list[$current_depth] } )
        {
            $self->set_for_semicolon_breakpoints($current_depth);

            # and open up a long 'for' or 'foreach' container to allow
            # leading term alignment unless -lp is used.
            $has_comma_breakpoints = 1 unless ($lp_object);
        }

        #----------------------------------------------------------------
        # FINALLY: Break open container according to the flags which have
        # been set.
        #----------------------------------------------------------------
        if (

            # breaks for code BLOCKS are handled at a higher level
            !$block_type

            # we do not need to break at the top level of an 'if'
            # type expression
            && !$is_simple_logical_expression

            ## modification to keep ': (' containers vertically tight;
            ## but probably better to let user set -vt=1 to avoid
            ## inconsistency with other paren types
            ## && ($container_type[$current_depth] ne ':')

            # otherwise, we require one of these reasons for breaking:
            && (

                # - this term has forced line breaks
                $has_comma_breakpoints

                # - the opening container is separated from this batch
                #   for some reason (comment, blank line, code block)
                # - this is a non-paren container spanning multiple lines
                || !$saw_opening_structure

                # - this is a long block contained in another breakable
                #   container
                || $is_long_term && !$self->is_in_block_by_i($i_opening)
            )
          )
        {

            # do special -lp breaks at the CLOSING token for INTACT
            # blocks (because we might not do them if the block does
            # not break open)
            if ($lp_object) {
                my $K_begin_line = $lp_object->get_K_begin_line();
                my $i_begin_line = $K_begin_line - $K_to_go[0];
                $self->set_forced_lp_break( $i_begin_line, $i_opening );
            }

            # break after opening structure.
            # note: break before closing structure will be automatic
            if ( $minimum_depth <= $current_depth ) {

                if ( $i_opening >= 0 ) {
                    if (   !$do_not_break_apart
                        && !is_unbreakable_container($current_depth) )
                    {
                        $self->set_forced_breakpoint($i_opening);

                        # Do not let brace types L/R use vertical tightness
                        # flags to recombine if we have to break on length
                        # because instability is possible if both vt and vtc
                        # flags are set ... see issue b1444.
                        if (   $is_long_term
                            && $types_to_go[$i_opening] eq 'L'
                            && $opening_vertical_tightness{'{'}
                            && $closing_vertical_tightness{'}'} )
                        {
                            my $seqno = $type_sequence_to_go[$i_opening];
                            if ($seqno) {
                                $self->[_rbreak_container_]->{$seqno} = 1;
                            }
                        }
                    }
                }

                # break at ',' of lower depth level before opening token
                if ( $last_comma_index[$depth] ) {
                    $self->set_forced_breakpoint( $last_comma_index[$depth] );
                }

                # break at '.' of lower depth level before opening token
                if ( $last_dot_index[$depth] ) {
                    $self->set_forced_breakpoint( $last_dot_index[$depth] );
                }

                # break before opening structure if preceded by another
                # closing structure and a comma.  This is normally
                # done by the previous closing brace, but not
                # if it was a one-line block.
                if ( $i_opening > 2 ) {
                    my $i_prev =
                      ( $types_to_go[ $i_opening - 1 ] eq 'b' )
                      ? $i_opening - 2
                      : $i_opening - 1;

                    my $type_prev  = $types_to_go[$i_prev];
                    my $token_prev = $tokens_to_go[$i_prev];
                    if (
                        $type_prev eq ','
                        && (   $types_to_go[ $i_prev - 1 ] eq ')'
                            || $types_to_go[ $i_prev - 1 ] eq '}' )
                      )
                    {
                        $self->set_forced_breakpoint($i_prev);
                    }

                    # also break before something like ':('  or '?('
                    # if appropriate.
                    elsif ($type_prev =~ /^([k\:\?]|&&|\|\|)$/
                        && $want_break_before{$token_prev} )
                    {
                        $self->set_forced_breakpoint($i_prev);
                    }
                    else {
                        ## not a breakpoint
                    }
                }
            }

            # break after comma following closing structure
            if ( $types_to_go[ $i + 1 ] eq ',' ) {
                $self->set_forced_breakpoint( $i + 1 );
            }

            # break before an '=' following closing structure
            if (
                $is_assignment{$next_nonblank_type}
                && ( $breakpoint_stack[$current_depth] !=
                    $forced_breakpoint_count )
              )
            {
                $self->set_forced_breakpoint($i);
            }

            # break at any comma before the opening structure Added
            # for -lp, but seems to be good in general.  It isn't
            # obvious how far back to look; the '5' below seems to
            # work well and will catch the comma in something like
            #  push @list, myfunc( $param, $param, ..

            my $icomma = $last_comma_index[$depth];
            if ( defined($icomma) && ( $i_opening - $icomma ) < 5 ) {
                if ( !$forced_breakpoint_to_go[$icomma] ) {
                    $self->set_forced_breakpoint($icomma);
                }
            }
        }

        #-----------------------------------------------------------
        # Break open a logical container open if it was already open
        #-----------------------------------------------------------
        elsif ($is_simple_logical_expression
            && $has_old_logical_breakpoints[$current_depth] )
        {
            $self->set_logical_breakpoints($current_depth);
        }

        # Handle long container which does not get opened up
        elsif ($is_long_term) {

            # must set fake breakpoint to alert outer containers that
            # they are complex
            set_fake_breakpoint();
        }
        else {
            ## do not break open
        }

        return;
    } ## end sub break_lists_decreasing_depth
} ## end closure break_lists

my %is_kwiZ;
my %is_key_type;

BEGIN {

    # Added 'w' to fix b1172
    my @q = qw(k w i Z ->);
    @is_kwiZ{@q} = (1) x scalar(@q);

    # added = for b1211
    @q = qw<( [ { L R } ] ) = b>;
    push @q, ',';
    @is_key_type{@q} = (1) x scalar(@q);
} ## end BEGIN

use constant DEBUG_FIND_START => 0;

sub find_token_starting_list {

    # When testing to see if a block will fit on one line, some
    # previous token(s) may also need to be on the line; particularly
    # if this is a sub call.  So we will look back at least one
    # token.
    my ( $self, $i_opening_paren ) = @_;

    # This will be the return index
    my $i_opening_minus = $i_opening_paren;

    if ( $i_opening_minus <= 0 ) {
        return $i_opening_minus;
    }

    my $im1 = $i_opening_paren - 1;
    my ( $iprev_nb, $type_prev_nb ) = ( $im1, $types_to_go[$im1] );
    if ( $type_prev_nb eq 'b' && $iprev_nb > 0 ) {
        $iprev_nb -= 1;
        $type_prev_nb = $types_to_go[$iprev_nb];
    }

    if ( $type_prev_nb eq ',' ) {

        # a previous comma is a good break point
        # $i_opening_minus = $i_opening_paren;
    }

    elsif (
        $tokens_to_go[$i_opening_paren] eq '('

        # non-parens added here to fix case b1186
        || $is_kwiZ{$type_prev_nb}
      )
    {
        $i_opening_minus = $im1;

        # Walk back to improve length estimate...
        # FIX for cases b1169 b1170 b1171: start walking back
        # at the previous nonblank. This makes the result insensitive
        # to the flag --space-function-paren, and similar.
        # previous loop: for ( my $j = $im1 ; $j >= 0 ; $j-- ) {
        foreach my $j ( reverse( 0 .. $iprev_nb ) ) {
            if ( $is_key_type{ $types_to_go[$j] } ) {

                # fix for b1211
                if ( $types_to_go[$j] eq '=' ) { $i_opening_minus = $j }
                last;
            }
            $i_opening_minus = $j;
        }
        if ( $types_to_go[$i_opening_minus] eq 'b' ) { $i_opening_minus++ }
    }
    else {
        ## previous token not special
    }

    DEBUG_FIND_START && print <<EOM;
FIND_START: i=$i_opening_paren tok=$tokens_to_go[$i_opening_paren] => im=$i_opening_minus tok=$tokens_to_go[$i_opening_minus]
EOM

    return $i_opening_minus;
} ## end sub find_token_starting_list

{    ## begin closure table_maker

    my %is_keyword_with_special_leading_term;

    BEGIN {

        # These keywords have prototypes which allow a special leading item
        # followed by a list
        my @q = qw(
          chmod
          formline
          grep
          join
          kill
          map
          pack
          printf
          push
          sprintf
          unshift
        );
        @is_keyword_with_special_leading_term{@q} = (1) x scalar(@q);
    } ## end BEGIN

    use constant DEBUG_SPARSE => 0;

    sub table_maker {

        # Given a list of comma-separated items, set breakpoints at some of
        # the commas, if necessary, to make it easy to read.
        # This is done by making calls to 'set_forced_breakpoint'.
        # This is a complex routine because there are many special cases.

        # Returns: nothing

        # The numerous variables involved are contained three hashes:
        # $rhash_IN : For contents see the calling routine
        # $rhash_A: For contents see return from sub 'table_layout_A'
        # $rhash_B: For contents see return from sub 'table_layout_B'

        my ( $self, $rhash_IN ) = @_;

        # Find lengths of all list items needed for calculating page layout
        my $rhash_A = table_layout_A($rhash_IN);
        return if ( !defined($rhash_A) );

        # Some variables received from caller...
        my $i_closing_paren    = $rhash_IN->{i_closing_paren};
        my $i_opening_paren    = $rhash_IN->{i_opening_paren};
        my $has_broken_sublist = $rhash_IN->{has_broken_sublist};
        my $interrupted        = $rhash_IN->{interrupted};

        #-----------------------------------------
        # Section A: Handle some special cases ...
        #-----------------------------------------

        #-------------------------------------------------------------
        # Special Case A1: Compound List Rule 1:
        # Break at (almost) every comma for a list containing a broken
        # sublist.  This has higher priority than the Interrupted List
        # Rule.
        #-------------------------------------------------------------
        if ($has_broken_sublist) {

            $self->apply_broken_sublist_rule( $rhash_A, $interrupted );

            return;
        }

        #--------------------------------------------------------------
        # Special Case A2: Interrupted List Rule:
        # A list is forced to use old breakpoints if it was interrupted
        # by side comments or blank lines, or requested by user.
        #--------------------------------------------------------------
        if (   $rOpts_break_at_old_comma_breakpoints
            || $interrupted
            || $i_opening_paren < 0 )
        {
            my $i_first_comma     = $rhash_A->{_i_first_comma};
            my $i_true_last_comma = $rhash_A->{_i_true_last_comma};
            $self->copy_old_breakpoints( $i_first_comma, $i_true_last_comma );
            return;
        }

        #-----------------------------------------------------------------
        # Special Case A3: If it fits on one line, return and let the line
        # break logic decide if and where to break.
        #-----------------------------------------------------------------

        # The -bbxi=2 parameters can add an extra hidden level of indentation
        # so they need a tolerance to avoid instability.  Fixes b1259, 1260.
        my $opening_token = $tokens_to_go[$i_opening_paren];
        my $tol           = 0;
        if (   $break_before_container_types{$opening_token}
            && $container_indentation_options{$opening_token}
            && $container_indentation_options{$opening_token} == 2 )
        {
            $tol = $rOpts_indent_columns;

            # use greater of -ci and -i (fix for case b1334)
            if ( $tol < $rOpts_continuation_indentation ) {
                $tol = $rOpts_continuation_indentation;
            }
        }

        # Increase tol when -atc and -dtc are both used to allow for
        # possible loss in length on next pass due to a comma. Fixes b1455.
        if ( $rOpts_delete_trailing_commas && $rOpts_add_trailing_commas ) {
            $tol += 1;
        }

        my $i_opening_minus = $self->find_token_starting_list($i_opening_paren);
        my $excess =
          $self->excess_line_length( $i_opening_minus, $i_closing_paren );
        return if ( $excess + $tol <= 0 );

        #---------------------------------------
        # Section B: Handle a multiline list ...
        #---------------------------------------

        $self->break_multiline_list( $rhash_IN, $rhash_A, $i_opening_minus );
        return;

    } ## end sub table_maker

    sub apply_broken_sublist_rule {

        my ( $self, $rhash_A, $interrupted ) = @_;

        # Break at (almost) every comma for a list containing a broken
        # sublist.

        my $ritem_lengths     = $rhash_A->{_ritem_lengths};
        my $ri_term_begin     = $rhash_A->{_ri_term_begin};
        my $ri_term_end       = $rhash_A->{_ri_term_end};
        my $ri_term_comma     = $rhash_A->{_ri_term_comma};
        my $item_count        = $rhash_A->{_item_count_A};
        my $i_first_comma     = $rhash_A->{_i_first_comma};
        my $i_true_last_comma = $rhash_A->{_i_true_last_comma};

        # Break at every comma except for a comma between two
        # simple, small terms.  This prevents long vertical
        # columns of, say, just 0's.
        my $small_length = 10;    # 2 + actual maximum length wanted

        # We'll insert a break in long runs of small terms to
        # allow alignment in uniform tables.
        my $skipped_count = 0;
        my $columns       = table_columns_available($i_first_comma);
        my $fields        = int( $columns / $small_length );
        if (   $rOpts_maximum_fields_per_table
            && $fields > $rOpts_maximum_fields_per_table )
        {
            $fields = $rOpts_maximum_fields_per_table;
        }
        my $max_skipped_count = $fields - 1;

        my $is_simple_last_term = 0;
        my $is_simple_next_term = 0;
        foreach my $j ( 0 .. $item_count ) {
            $is_simple_last_term = $is_simple_next_term;
            $is_simple_next_term = 0;
            if (   $j < $item_count
                && $ri_term_end->[$j] == $ri_term_begin->[$j]
                && $ritem_lengths->[$j] <= $small_length )
            {
                $is_simple_next_term = 1;
            }
            next if $j == 0;
            if (   $is_simple_last_term
                && $is_simple_next_term
                && $skipped_count < $max_skipped_count )
            {
                $skipped_count++;
            }
            else {
                $skipped_count = 0;
                my $i_tc = $ri_term_comma->[ $j - 1 ];
                last unless defined $i_tc;
                $self->set_forced_breakpoint($i_tc);
            }
        }

        # always break at the last comma if this list is
        # interrupted; we wouldn't want to leave a terminal '{', for
        # example.
        if ($interrupted) {
            $self->set_forced_breakpoint($i_true_last_comma);
        }
        return;
    } ## end sub apply_broken_sublist_rule

    sub set_emergency_comma_breakpoints {

        my (

            $self,    #

            $number_of_fields_best,
            $rhash_IN,
            $comma_count,
            $i_first_comma,

        ) = @_;

        # The computed number of table fields is negative, so we have to make
        # an emergency fix.

        my $rcomma_index        = $rhash_IN->{rcomma_index};
        my $next_nonblank_type  = $rhash_IN->{next_nonblank_type};
        my $rdo_not_break_apart = $rhash_IN->{rdo_not_break_apart};
        my $must_break_open     = $rhash_IN->{must_break_open};

        # are we an item contained in an outer list?
        my $in_hierarchical_list = $next_nonblank_type =~ /^[\}\,]$/;

        # In many cases, it may be best to not force a break if there is just
        # one comma, because the standard continuation break logic will do a
        # better job without it.

        # In the common case that all but one of the terms can fit
        # on a single line, it may look better not to break open the
        # containing parens.  Consider, for example

        #     $color =
        #       join ( '/',
        #         sort { $color_value{$::a} <=> $color_value{$::b}; }
        #         keys %colors );

        # which will look like this with the container broken:

        #   $color = join (
        #       '/',
        #       sort { $color_value{$::a} <=> $color_value{$::b}; } keys %colors
        #   );

        # Here is an example of this rule for a long last term:

        #   log_message( 0, 256, 128,
        #       "Number of routes in adj-RIB-in to be considered: $peercount" );

        # And here is an example with a long first term:

        # $s = sprintf(
        # "%2d wallclock secs (%$f usr %$f sys + %$f cusr %$f csys = %$f CPU)",
        #     $r, $pu, $ps, $cu, $cs, $tt
        #   )
        #   if $style eq 'all';

        my $i_last_comma = $rcomma_index->[ $comma_count - 1 ];

        my $long_last_term = $self->excess_line_length( 0, $i_last_comma ) <= 0;
        my $long_first_term =
          $self->excess_line_length( $i_first_comma + 1, $max_index_to_go ) <=
          0;

        # break at every comma ...
        if (

            # if requested by user or is best looking
            $number_of_fields_best == 1

            # or if this is a sublist of a larger list
            || $in_hierarchical_list

            # or if multiple commas and we don't have a long first or last
            # term
            || ( $comma_count > 1
                && !( $long_last_term || $long_first_term ) )
          )
        {
            foreach ( 0 .. $comma_count - 1 ) {
                $self->set_forced_breakpoint( $rcomma_index->[$_] );
            }
        }
        elsif ($long_last_term) {

            $self->set_forced_breakpoint($i_last_comma);
            ${$rdo_not_break_apart} = 1 unless $must_break_open;
        }
        elsif ($long_first_term) {

            $self->set_forced_breakpoint($i_first_comma);
        }
        else {

            # let breaks be defined by default bond strength logic
        }
        return;
    } ## end sub set_emergency_comma_breakpoints

    sub break_multiline_list {
        my ( $self, $rhash_IN, $rhash_A, $i_opening_minus ) = @_;

        # We have a list spanning multiple lines and are trying
        # to decide the best way to set comma breakpoints.

        # Overriden variables
        my $item_count       = $rhash_A->{_item_count_A};
        my $identifier_count = $rhash_A->{_identifier_count_A};

        # Derived variables:
        my $ritem_lengths          = $rhash_A->{_ritem_lengths};
        my $ri_term_begin          = $rhash_A->{_ri_term_begin};
        my $ri_term_end            = $rhash_A->{_ri_term_end};
        my $ri_term_comma          = $rhash_A->{_ri_term_comma};
        my $rmax_length            = $rhash_A->{_rmax_length};
        my $comma_count            = $rhash_A->{_comma_count};
        my $i_effective_last_comma = $rhash_A->{_i_effective_last_comma};
        my $first_term_length      = $rhash_A->{_first_term_length};
        my $i_first_comma          = $rhash_A->{_i_first_comma};
        my $i_last_comma           = $rhash_A->{_i_last_comma};
        my $i_true_last_comma      = $rhash_A->{_i_true_last_comma};

        # Variables received from caller
        my $i_opening_paren     = $rhash_IN->{i_opening_paren};
        my $i_closing_paren     = $rhash_IN->{i_closing_paren};
        my $rcomma_index        = $rhash_IN->{rcomma_index};
        my $next_nonblank_type  = $rhash_IN->{next_nonblank_type};
        my $list_type           = $rhash_IN->{list_type};
        my $interrupted         = $rhash_IN->{interrupted};
        my $rdo_not_break_apart = $rhash_IN->{rdo_not_break_apart};
        my $must_break_open     = $rhash_IN->{must_break_open};
## NOTE: these input vars from caller use the values from rhash_A (see above):
##      my $item_count          = $rhash_IN->{item_count};
##      my $identifier_count    = $rhash_IN->{identifier_count};

        # NOTE: i_opening_paren changes value below so we need to get these here
        my $opening_is_in_block = $self->is_in_block_by_i($i_opening_paren);
        my $opening_token       = $tokens_to_go[$i_opening_paren];

        #---------------------------------------------------------------
        # Section B1: Determine '$number_of_fields' = the best number of
        # fields to use if this is to be formatted as a table.
        #---------------------------------------------------------------

        # Now we know that this block spans multiple lines; we have to set
        # at least one breakpoint -- real or fake -- as a signal to break
        # open any outer containers.
        set_fake_breakpoint();

        # Set a flag indicating if we need to break open to keep -lp
        # items aligned.  This is necessary if any of the list terms
        # exceeds the available space after the '('.
        my $need_lp_break_open = $must_break_open;
        my $is_lp_formatting   = ref( $leading_spaces_to_go[$i_first_comma] );
        if ( $is_lp_formatting && !$must_break_open ) {
            my $columns_if_unbroken =
              $maximum_line_length_at_level[ $levels_to_go[$i_opening_minus] ]
              - total_line_length( $i_opening_minus, $i_opening_paren );
            $need_lp_break_open =
                 ( $rmax_length->[0] > $columns_if_unbroken )
              || ( $rmax_length->[1] > $columns_if_unbroken )
              || ( $first_term_length > $columns_if_unbroken );
        }

        my $hash_B =
          $self->table_layout_B( $rhash_IN, $rhash_A, $is_lp_formatting );
        return if ( !defined($hash_B) );

        # Updated variables
        $i_first_comma   = $hash_B->{_i_first_comma_B};
        $i_opening_paren = $hash_B->{_i_opening_paren_B};
        $item_count      = $hash_B->{_item_count_B};

        # New variables
        my $columns                 = $hash_B->{_columns};
        my $formatted_columns       = $hash_B->{_formatted_columns};
        my $formatted_lines         = $hash_B->{_formatted_lines};
        my $max_width               = $hash_B->{_max_width};
        my $new_identifier_count    = $hash_B->{_new_identifier_count};
        my $number_of_fields        = $hash_B->{_number_of_fields};
        my $odd_or_even             = $hash_B->{_odd_or_even};
        my $packed_columns          = $hash_B->{_packed_columns};
        my $packed_lines            = $hash_B->{_packed_lines};
        my $pair_width              = $hash_B->{_pair_width};
        my $ri_ragged_break_list    = $hash_B->{_ri_ragged_break_list};
        my $use_separate_first_term = $hash_B->{_use_separate_first_term};

        # are we an item contained in an outer list?
        my $in_hierarchical_list = $next_nonblank_type =~ /^[\}\,]$/;

        my $unused_columns = $formatted_columns - $packed_columns;

        # set some empirical parameters to help decide if we should try to
        # align; high sparsity does not look good, especially with few lines
        my $sparsity = ($unused_columns) / ($formatted_columns);
        my $max_allowed_sparsity =
            ( $item_count < 3 )    ? 0.1
          : ( $packed_lines == 1 ) ? 0.15
          : ( $packed_lines == 2 ) ? 0.4
          :                          0.7;

        my $two_line_word_wrap_ok;
        if ( $opening_token eq '(' ) {

            # default is to allow wrapping of short paren lists
            $two_line_word_wrap_ok = 1;

            # but turn off word wrap where requested
            if ($rOpts_break_open_compact_parens) {

                # This parameter is a one-character flag, as follows:
                #  '0' matches no parens  -> break open NOT OK -> word wrap OK
                #  '1' matches all parens -> break open OK -> word wrap NOT OK
                #  Other values are the same as used by the weld-exclusion-list
                my $flag = $rOpts_break_open_compact_parens;
                if (   $flag eq '*'
                    || $flag eq '1' )
                {
                    $two_line_word_wrap_ok = 0;
                }
                elsif ( $flag eq '0' ) {
                    $two_line_word_wrap_ok = 1;
                }
                else {
                    my $seqno = $type_sequence_to_go[$i_opening_paren];
                    $two_line_word_wrap_ok =
                      !$self->match_paren_control_flag( $seqno, $flag );
                }
            }
        }

        #-------------------------------------------------------------------
        # Section B2: Check for shortcut methods, which avoid treating
        # a list as a table for relatively small parenthesized lists.  These
        # are usually easier to read if not formatted as tables.
        #-------------------------------------------------------------------
        if (
            $packed_lines <= 2           # probably can fit in 2 lines
            && $item_count < 9           # doesn't have too many items
            && $opening_is_in_block      # not a sub-container
            && $two_line_word_wrap_ok    # ok to wrap this paren list
          )
        {

            # Section B2A: Shortcut method 1: for -lp and just one comma:
            # This is a no-brainer, just break at the comma.
            if (
                $is_lp_formatting      # -lp
                && $item_count == 2    # two items, one comma
                && !$must_break_open
              )
            {
                my $i_break = $rcomma_index->[0];
                $self->set_forced_breakpoint($i_break);
                ${$rdo_not_break_apart} = 1;
                return;

            }

            # Section B2B: Shortcut method 2 is for most small ragged lists
            # which might look best if not displayed as a table.
            if (
                ( $number_of_fields == 2 && $item_count == 3 )
                || (
                    $new_identifier_count > 0    # isn't all quotes
                    && $sparsity > 0.15
                )    # would be fairly spaced gaps if aligned
              )
            {

                my $break_count = $self->set_ragged_breakpoints( $ri_term_comma,
                    $ri_ragged_break_list );
                ++$break_count if ($use_separate_first_term);

                # NOTE: we should really use the true break count here,
                # which can be greater if there are large terms and
                # little space, but usually this will work well enough.
                if ( !$must_break_open ) {
                    if ( $break_count <= 1
                        || ( $is_lp_formatting && !$need_lp_break_open ) )
                    {
                        ${$rdo_not_break_apart} = 1;
                    }
                }
                return;
            }

        } ## end shortcut methods

        # debug stuff
        DEBUG_SPARSE && do {

            # How many spaces across the page will we fill?
            my $columns_per_line =
              ( int $number_of_fields / 2 ) * $pair_width +
              ( $number_of_fields % 2 ) * $max_width;

            print {*STDOUT}
"SPARSE:cols=$columns commas=$comma_count items:$item_count ids=$identifier_count pairwidth=$pair_width fields=$number_of_fields lines packed: $packed_lines packed_cols=$packed_columns fmtd:$formatted_lines cols /line:$columns_per_line  unused:$unused_columns fmtd:$formatted_columns sparsity=$sparsity allow=$max_allowed_sparsity\n";

        };

        #------------------------------------------------------------------
        # Section B3: Compound List Rule 2:
        # If this list is too long for one line, and it is an item of a
        # larger list, then we must format it, regardless of sparsity
        # (ian.t).  One reason that we have to do this is to trigger
        # Compound List Rule 1, above, which causes breaks at all commas of
        # all outer lists.  In this way, the structure will be properly
        # displayed.
        #------------------------------------------------------------------

        # Decide if this list is too long for one line unless broken
        my $total_columns = table_columns_available($i_opening_paren);
        my $too_long      = $packed_columns > $total_columns;

        # For a paren list, include the length of the token just before the
        # '(' because this is likely a sub call, and we would have to
        # include the sub name on the same line as the list.  This is still
        # imprecise, but not too bad.  (steve.t)
        if ( !$too_long && $i_opening_paren > 0 && $opening_token eq '(' ) {

            $too_long = $self->excess_line_length( $i_opening_minus,
                $i_effective_last_comma + 1 ) > 0;
        }

        # TODO: For an item after a '=>', try to include the length of the
        # thing before the '=>'.  This is crude and should be improved by
        # actually looking back token by token.
        if ( !$too_long && $i_opening_paren > 0 && $list_type eq '=>' ) {
            my $i_opening_minus_test = $i_opening_paren - 4;
            if ( $i_opening_minus >= 0 ) {
                $too_long = $self->excess_line_length( $i_opening_minus_test,
                    $i_effective_last_comma + 1 ) > 0;
            }
        }

        # Always break lists contained in '[' and '{' if too long for 1 line,
        # and always break lists which are too long and part of a more complex
        # structure.
        my $must_break_open_container = $must_break_open
          || ( $too_long
            && ( $in_hierarchical_list || !$two_line_word_wrap_ok ) );

        #--------------------------------------------------------------------
        # Section B4: A table will work here. But do not attempt to align
        # columns if this is a tiny table or it would be too spaced.  It
        # seems that the more packed lines we have, the sparser the list that
        # can be allowed and still look ok.
        #--------------------------------------------------------------------

        if (   ( $formatted_lines < 3 && $packed_lines < $formatted_lines )
            || ( $formatted_lines < 2 )
            || ( $unused_columns > $max_allowed_sparsity * $formatted_columns )
          )
        {
            #----------------------------------------------------------------
            # Section B4A: too sparse: would not look good aligned in a table
            #----------------------------------------------------------------

            # use old breakpoints if this is a 'big' list
            if ( $packed_lines > 2 && $item_count > 10 ) {
                write_logfile_entry("List sparse: using old breakpoints\n");
                $self->copy_old_breakpoints( $i_first_comma, $i_last_comma );
            }

            # let the continuation logic handle it if 2 lines
            else {

                my $break_count = $self->set_ragged_breakpoints( $ri_term_comma,
                    $ri_ragged_break_list );
                ++$break_count if ($use_separate_first_term);

                if ( !$must_break_open_container ) {
                    if ( $break_count <= 1
                        || ( $is_lp_formatting && !$need_lp_break_open ) )
                    {
                        ${$rdo_not_break_apart} = 1;
                    }
                }
            }
            return;
        }

        #--------------------------------------------
        # Section B4B: Go ahead and format as a table
        #--------------------------------------------
        $self->write_formatted_table( $number_of_fields, $comma_count,
            $rcomma_index, $use_separate_first_term );

        return;
    } ## end sub break_multiline_list

    sub table_layout_A {

        my ($rhash_IN) = @_;

        # Find lengths of all list items needed to calculate page layout

        # Returns:
        #    - nothing if this list is empty, or
        #    - a ref to a hash containing some derived parameters

        my $i_opening_paren  = $rhash_IN->{i_opening_paren};
        my $i_closing_paren  = $rhash_IN->{i_closing_paren};
        my $identifier_count = $rhash_IN->{identifier_count};
        my $rcomma_index     = $rhash_IN->{rcomma_index};
        my $item_count       = $rhash_IN->{item_count};

        # nothing to do if no commas seen
        return if ( $item_count < 1 );

        my $i_first_comma     = $rcomma_index->[0];
        my $i_true_last_comma = $rcomma_index->[ $item_count - 1 ];
        my $i_last_comma      = $i_true_last_comma;
        if ( $i_last_comma >= $max_index_to_go ) {
            $item_count -= 1;
            return if ( $item_count < 1 );
            $i_last_comma = $rcomma_index->[ $item_count - 1 ];
        }

        my $comma_count = $item_count;

        my $ritem_lengths = [];
        my $ri_term_begin = [];
        my $ri_term_end   = [];
        my $ri_term_comma = [];

        my $rmax_length = [ 0, 0 ];

        my $i_prev_plus;
        my $first_term_length;
        my $i      = $i_opening_paren;
        my $is_odd = 1;

        foreach my $j ( 0 .. $comma_count - 1 ) {
            $is_odd      = 1 - $is_odd;
            $i_prev_plus = $i + 1;
            $i           = $rcomma_index->[$j];

            my $i_term_end =
              ( $i == 0 || $types_to_go[ $i - 1 ] eq 'b' )
              ? $i - 2
              : $i - 1;
            my $i_term_begin =
              ( $types_to_go[$i_prev_plus] eq 'b' )
              ? $i_prev_plus + 1
              : $i_prev_plus;
            push @{$ri_term_begin}, $i_term_begin;
            push @{$ri_term_end},   $i_term_end;
            push @{$ri_term_comma}, $i;

            # note: currently adding 2 to all lengths (for comma and space)
            my $length =
              2 + token_sequence_length( $i_term_begin, $i_term_end );
            push @{$ritem_lengths}, $length;

            if ( $j == 0 ) {
                $first_term_length = $length;
            }
            else {

                if ( $length > $rmax_length->[$is_odd] ) {
                    $rmax_length->[$is_odd] = $length;
                }
            }
        }

        # now we have to make a distinction between the comma count and item
        # count, because the item count will be one greater than the comma
        # count if the last item is not terminated with a comma
        my $i_b =
          ( $types_to_go[ $i_last_comma + 1 ] eq 'b' )
          ? $i_last_comma + 1
          : $i_last_comma;
        my $i_e =
          ( $types_to_go[ $i_closing_paren - 1 ] eq 'b' )
          ? $i_closing_paren - 2
          : $i_closing_paren - 1;
        my $i_effective_last_comma = $i_last_comma;

        my $last_item_length = token_sequence_length( $i_b + 1, $i_e );

        if ( $last_item_length > 0 ) {

            # add 2 to length because other lengths include a comma and a blank
            $last_item_length += 2;
            push @{$ritem_lengths}, $last_item_length;
            push @{$ri_term_begin}, $i_b + 1;
            push @{$ri_term_end},   $i_e;
            push @{$ri_term_comma}, undef;

            my $i_odd = $item_count % 2;

            if ( $last_item_length > $rmax_length->[$i_odd] ) {
                $rmax_length->[$i_odd] = $last_item_length;
            }

            $item_count++;
            $i_effective_last_comma = $i_e + 1;

            if ( $types_to_go[ $i_b + 1 ] =~ /^[iR\]]$/ ) {
                $identifier_count++;
            }
        }

        # be sure we do not extend beyond the current list length
        if ( $i_effective_last_comma >= $max_index_to_go ) {
            $i_effective_last_comma = $max_index_to_go - 1;
        }

        # Return the hash of derived variables.
        return {

            # Updated variables
            _item_count_A       => $item_count,
            _identifier_count_A => $identifier_count,

            # New variables
            _ritem_lengths          => $ritem_lengths,
            _ri_term_begin          => $ri_term_begin,
            _ri_term_end            => $ri_term_end,
            _ri_term_comma          => $ri_term_comma,
            _rmax_length            => $rmax_length,
            _comma_count            => $comma_count,
            _i_effective_last_comma => $i_effective_last_comma,
            _first_term_length      => $first_term_length,
            _i_first_comma          => $i_first_comma,
            _i_last_comma           => $i_last_comma,
            _i_true_last_comma      => $i_true_last_comma,
        };

    } ## end sub table_layout_A

    sub table_layout_B {

        my ( $self, $rhash_IN, $rhash_A, $is_lp_formatting ) = @_;

        # Determine variables for the best table layout, including
        # the best number of fields.

        # Returns:
        #    - nothing if nothing more to do
        #    - a ref to a hash containg some derived parameters

        # Variables from caller
        my $i_opening_paren     = $rhash_IN->{i_opening_paren};
        my $list_type           = $rhash_IN->{list_type};
        my $next_nonblank_type  = $rhash_IN->{next_nonblank_type};
        my $rcomma_index        = $rhash_IN->{rcomma_index};
        my $rdo_not_break_apart = $rhash_IN->{rdo_not_break_apart};

        # Table size variables
        my $comma_count            = $rhash_A->{_comma_count};
        my $first_term_length      = $rhash_A->{_first_term_length};
        my $i_effective_last_comma = $rhash_A->{_i_effective_last_comma};
        my $i_first_comma          = $rhash_A->{_i_first_comma};
        my $identifier_count       = $rhash_A->{_identifier_count_A};
        my $item_count             = $rhash_A->{_item_count_A};
        my $ri_term_begin          = $rhash_A->{_ri_term_begin};
        my $ri_term_comma          = $rhash_A->{_ri_term_comma};
        my $ri_term_end            = $rhash_A->{_ri_term_end};
        my $ritem_lengths          = $rhash_A->{_ritem_lengths};
        my $rmax_length            = $rhash_A->{_rmax_length};

        # Specify if the list must have an even number of fields or not.
        # It is generally safest to assume an even number, because the
        # list items might be a hash list.  But if we can be sure that
        # it is not a hash, then we can allow an odd number for more
        # flexibility.
        # 1 = odd field count ok, 2 = want even count
        my $odd_or_even = 2;
        if (
               $identifier_count >= $item_count - 1
            || $is_assignment{$next_nonblank_type}
            || (   $list_type
                && $list_type ne '=>'
                && $list_type !~ /^[\:\?]$/ )
          )
        {
            $odd_or_even = 1;
        }

        # do we have a long first term which should be
        # left on a line by itself?
        my $use_separate_first_term = (
            $odd_or_even == 1              # only if we can use 1 field/line
              && $item_count > 3           # need several items
              && $first_term_length >
              2 * $rmax_length->[0] - 2    # need long first term
              && $first_term_length >
              2 * $rmax_length->[1] - 2    # need long first term
        );

        # or do we know from the type of list that the first term should
        # be placed alone?
        if ( !$use_separate_first_term ) {
            if ( $is_keyword_with_special_leading_term{$list_type} ) {
                $use_separate_first_term = 1;

                # should the container be broken open?
                if ( $item_count < 3 ) {
                    if ( $i_first_comma - $i_opening_paren < 4 ) {
                        ${$rdo_not_break_apart} = 1;
                    }
                }
                elsif ($first_term_length < 20
                    && $i_first_comma - $i_opening_paren < 4 )
                {
                    my $columns = table_columns_available($i_first_comma);
                    if ( $first_term_length < $columns ) {
                        ${$rdo_not_break_apart} = 1;
                    }
                }
                else {
                    ## ok
                }
            }
        }

        # if so,
        if ($use_separate_first_term) {

            # ..set a break and update starting values
            $self->set_forced_breakpoint($i_first_comma);
            $item_count--;

            #---------------------------------------------------------------
            # Section B1A: Stop if one item remains ($i_first_comma = undef)
            #---------------------------------------------------------------
            # Fix for b1442: use '$item_count' here instead of '$comma_count'
            # to make the result independent of any trailing comma.
            return if ( $item_count <= 1 );

            $i_opening_paren = $i_first_comma;
            $i_first_comma   = $rcomma_index->[1];
            shift @{$ritem_lengths};
            shift @{$ri_term_begin};
            shift @{$ri_term_end};
            shift @{$ri_term_comma};
        }

        # if not, update the metrics to include the first term
        else {
            if ( $first_term_length > $rmax_length->[0] ) {
                $rmax_length->[0] = $first_term_length;
            }
        }

        # Field width parameters
        my $pair_width = ( $rmax_length->[0] + $rmax_length->[1] );
        my $max_width =
          ( $rmax_length->[0] > $rmax_length->[1] )
          ? $rmax_length->[0]
          : $rmax_length->[1];

        # Number of free columns across the page width for laying out tables
        my $columns = table_columns_available($i_first_comma);

        # Patch for b1210 and b1216-b1218 when -vmll is set.  If we are unable
        # to break after an opening paren, then the maximum line length for the
        # first line could be less than the later lines.  So we need to reduce
        # the line length.  Normally, we will get a break after an opening
        # paren, but in some cases we might not.
        if (   $rOpts_variable_maximum_line_length
            && $tokens_to_go[$i_opening_paren] eq '('
            && @{$ri_term_begin} )
        {
            my $ib   = $ri_term_begin->[0];
            my $type = $types_to_go[$ib];

            # So far, the only known instance of this problem is when
            # a bareword follows an opening paren with -vmll
            if ( $type eq 'w' ) {

                # If a line starts with paren+space+terms, then its max length
                # could be up to ci+2-i spaces less than if the term went out
                # on a line after the paren.  So..
                my $tol_w = max( 0,
                    2 + $rOpts_continuation_indentation -
                      $rOpts_indent_columns );
                $columns = max( 0, $columns - $tol_w );

                ## Here is the original b1210 fix, but it failed on b1216-b1218
                ##my $columns2 = table_columns_available($i_opening_paren);
                ##$columns = min( $columns, $columns2 );
            }
        }

        # Estimated maximum number of fields which fit this space.
        # This will be our first guess:
        my $number_of_fields_max =
          maximum_number_of_fields( $columns, $odd_or_even, $max_width,
            $pair_width );
        my $number_of_fields = $number_of_fields_max;

        # Find the best-looking number of fields.
        # This will be our second guess, if possible.
        my ( $number_of_fields_best, $ri_ragged_break_list,
            $new_identifier_count )
          = $self->study_list_complexity( $ri_term_begin, $ri_term_end,
            $ritem_lengths, $max_width );

        if (   $number_of_fields_best != 0
            && $number_of_fields_best < $number_of_fields_max )
        {
            $number_of_fields = $number_of_fields_best;
        }

        # fix b1427
        elsif ($number_of_fields_best > 1
            && $number_of_fields_best > $number_of_fields_max )
        {
            $number_of_fields_best = $number_of_fields_max;
        }
        else {
            ## ok
        }

        # If we are crowded and the -lp option is being used, try
        # to undo some indentation
        if (
            $is_lp_formatting
            && (
                $number_of_fields == 0
                || (   $number_of_fields == 1
                    && $number_of_fields != $number_of_fields_best )
            )
          )
        {
            ( $number_of_fields, $number_of_fields_best, $columns ) =
              $self->lp_table_fix(

                $columns,
                $i_first_comma,
                $max_width,
                $number_of_fields,
                $number_of_fields_best,
                $odd_or_even,
                $pair_width,
                $ritem_lengths,

              );
        }

        # try for one column if two won't work
        if ( $number_of_fields <= 0 ) {
            $number_of_fields = int( $columns / $max_width );
        }

        # The user can place an upper bound on the number of fields,
        # which can be useful for doing maintenance on tables
        if (   $rOpts_maximum_fields_per_table
            && $number_of_fields > $rOpts_maximum_fields_per_table )
        {
            $number_of_fields = $rOpts_maximum_fields_per_table;
        }

        # How many columns (characters) and lines would this container take
        # if no additional whitespace were added?
        my $packed_columns = token_sequence_length( $i_opening_paren + 1,
            $i_effective_last_comma + 1 );
        if ( $columns <= 0 ) { $columns = 1 }    # avoid divide by zero
        my $packed_lines = 1 + int( $packed_columns / $columns );

        #-----------------------------------------------------------------
        # Section B1B: Stop here if we did not compute a positive number of
        # fields. In this case we just have to bail out.
        #-----------------------------------------------------------------
        if ( $number_of_fields <= 0 ) {

            $self->set_emergency_comma_breakpoints(

                $number_of_fields_best,
                $rhash_IN,
                $comma_count,
                $i_first_comma,

            );
            return;
        }

        #------------------------------------------------------------------
        # Section B1B: We have a tentative field count that seems to work.
        # Now we must look more closely to determine if a table layout will
        # actually look okay.
        #------------------------------------------------------------------

        # How many lines will this require?
        my $formatted_lines = $item_count / ($number_of_fields);
        if ( $formatted_lines != int $formatted_lines ) {
            $formatted_lines = 1 + int $formatted_lines;
        }

        # So far we've been trying to fill out to the right margin.  But
        # compact tables are easier to read, so let's see if we can use fewer
        # fields without increasing the number of lines.
        $number_of_fields = compactify_table( $item_count, $number_of_fields,
            $formatted_lines, $odd_or_even );

        my $formatted_columns;

        if ( $number_of_fields > 1 ) {
            $formatted_columns =
              ( $pair_width * ( int( $item_count / 2 ) ) +
                  ( $item_count % 2 ) * $max_width );
        }
        else {
            $formatted_columns = $max_width * $item_count;
        }
        if ( $formatted_columns < $packed_columns ) {
            $formatted_columns = $packed_columns;
        }

        # Construce hash_B:
        return {

            # Updated variables
            _i_first_comma_B   => $i_first_comma,
            _i_opening_paren_B => $i_opening_paren,
            _item_count_B      => $item_count,

            # New variables
            _columns                 => $columns,
            _formatted_columns       => $formatted_columns,
            _formatted_lines         => $formatted_lines,
            _max_width               => $max_width,
            _new_identifier_count    => $new_identifier_count,
            _number_of_fields        => $number_of_fields,
            _odd_or_even             => $odd_or_even,
            _packed_columns          => $packed_columns,
            _packed_lines            => $packed_lines,
            _pair_width              => $pair_width,
            _ri_ragged_break_list    => $ri_ragged_break_list,
            _use_separate_first_term => $use_separate_first_term,
        };
    } ## end sub table_layout_B

    sub lp_table_fix {

        # try to undo some -lp indentation to improve table formatting

        my (

            $self,    #

            $columns,
            $i_first_comma,
            $max_width,
            $number_of_fields,
            $number_of_fields_best,
            $odd_or_even,
            $pair_width,
            $ritem_lengths,

        ) = @_;

        my $available_spaces =
          $self->get_available_spaces_to_go($i_first_comma);
        if ( $available_spaces > 0 ) {

            my $spaces_wanted = $max_width - $columns;    # for 1 field

            if ( $number_of_fields_best == 0 ) {
                $number_of_fields_best =
                  get_maximum_fields_wanted($ritem_lengths);
            }

            if ( $number_of_fields_best != 1 ) {
                my $spaces_wanted_2 = 1 + $pair_width - $columns; # for 2 fields
                if ( $available_spaces > $spaces_wanted_2 ) {
                    $spaces_wanted = $spaces_wanted_2;
                }
            }

            if ( $spaces_wanted > 0 ) {
                my $deleted_spaces =
                  $self->reduce_lp_indentation( $i_first_comma,
                    $spaces_wanted );

                # redo the math
                if ( $deleted_spaces > 0 ) {
                    $columns = table_columns_available($i_first_comma);
                    $number_of_fields =
                      maximum_number_of_fields( $columns, $odd_or_even,
                        $max_width, $pair_width );

                    if (   $number_of_fields_best == 1
                        && $number_of_fields >= 1 )
                    {
                        $number_of_fields = $number_of_fields_best;
                    }
                }
            }
        }
        return ( $number_of_fields, $number_of_fields_best, $columns );
    } ## end sub lp_table_fix

    sub write_formatted_table {

        # Write a table of comma separated items with fixed number of fields
        my ( $self, $number_of_fields, $comma_count, $rcomma_index,
            $use_separate_first_term )
          = @_;

        write_logfile_entry(
            "List: auto formatting with $number_of_fields fields/row\n");

        my $j_first_break =
            $use_separate_first_term
          ? $number_of_fields
          : $number_of_fields - 1;

        my $j = $j_first_break;
        while ( $j < $comma_count ) {
            my $i_comma = $rcomma_index->[$j];
            $self->set_forced_breakpoint($i_comma);
            $j += $number_of_fields;
        }
        return;
    } ## end sub write_formatted_table

} ## end closure set_comma_breakpoint_final

sub study_list_complexity {

    # Look for complex tables which should be formatted with one term per line.
    # Returns the following:
    #
    #  \@i_ragged_break_list = list of good breakpoints to avoid lines
    #    which are hard to read
    #  $number_of_fields_best = suggested number of fields based on
    #    complexity; = 0 if any number may be used.
    #
    my ( $self, $ri_term_begin, $ri_term_end, $ritem_lengths, $max_width ) = @_;
    my $item_count            = @{$ri_term_begin};
    my $complex_item_count    = 0;
    my $number_of_fields_best = $rOpts_maximum_fields_per_table;
    my $i_max                 = @{$ritem_lengths} - 1;
    ##my @item_complexity;

    my $i_last_last_break = -3;
    my $i_last_break      = -2;
    my @i_ragged_break_list;

    my $definitely_complex = 30;
    my $definitely_simple  = 12;
    my $quote_count        = 0;

    for my $i ( 0 .. $i_max ) {
        my $ib = $ri_term_begin->[$i];
        my $ie = $ri_term_end->[$i];

        # define complexity: start with the actual term length
        my $weighted_length = ( $ritem_lengths->[$i] - 2 );

        ##TBD: join types here and check for variations
        ##my $str=join "", @tokens_to_go[$ib..$ie];

        my $is_quote = 0;
        if ( $types_to_go[$ib] =~ /^[qQ]$/ ) {
            $is_quote = 1;
            $quote_count++;
        }
        elsif ( $types_to_go[$ib] =~ /^[w\-]$/ ) {
            $quote_count++;
        }
        else {
            ## ok
        }

        if ( $ib eq $ie ) {
            if ( $is_quote && $tokens_to_go[$ib] =~ /\s/ ) {
                $complex_item_count++;
                $weighted_length *= 2;
            }
            else {
            }
        }
        else {
            if ( first { $_ eq 'b' } @types_to_go[ $ib .. $ie ] ) {
                $complex_item_count++;
                $weighted_length *= 2;
            }
            if ( first { $_ eq '..' } @types_to_go[ $ib .. $ie ] ) {
                $weighted_length += 4;
            }
        }

        # add weight for extra tokens.
        $weighted_length += 2 * ( $ie - $ib );

##        my $BUB = join '', @tokens_to_go[$ib..$ie];
##        print "# COMPLEXITY:$weighted_length   $BUB\n";

##push @item_complexity, $weighted_length;

        # now mark a ragged break after this item it if it is 'long and
        # complex':
        if ( $weighted_length >= $definitely_complex ) {

            # if we broke after the previous term
            # then break before it too
            if (   $i_last_break == $i - 1
                && $i > 1
                && $i_last_last_break != $i - 2 )
            {

                ## TODO: don't strand a small term
                pop @i_ragged_break_list;
                push @i_ragged_break_list, $i - 2;
                push @i_ragged_break_list, $i - 1;
            }

            push @i_ragged_break_list, $i;
            $i_last_last_break = $i_last_break;
            $i_last_break      = $i;
        }

        # don't break before a small last term -- it will
        # not look good on a line by itself.
        elsif ($i == $i_max
            && $i_last_break == $i - 1
            && $weighted_length <= $definitely_simple )
        {
            pop @i_ragged_break_list;
        }
        else {
            ## ok
        }
    }

    my $identifier_count = $i_max + 1 - $quote_count;

    # Need more tuning here..
    if (   $max_width > 12
        && $complex_item_count > $item_count / 2
        && $number_of_fields_best != 2 )
    {
        $number_of_fields_best = 1;
    }

    return ( $number_of_fields_best, \@i_ragged_break_list, $identifier_count );
} ## end sub study_list_complexity

sub get_maximum_fields_wanted {

    # Not all tables look good with more than one field of items.
    # This routine looks at a table and decides if it should be
    # formatted with just one field or not.
    # This coding is still under development.
    my ($ritem_lengths) = @_;

    my $number_of_fields_best = 0;

    # For just a few items, we tentatively assume just 1 field.
    my $item_count = @{$ritem_lengths};
    if ( $item_count <= 5 ) {
        $number_of_fields_best = 1;
    }

    # For larger tables, look at it both ways and see what looks best
    else {

        my $is_odd            = 1;
        my @max_length        = ( 0,     0 );
        my @last_length_2     = ( undef, undef );
        my @first_length_2    = ( undef, undef );
        my $last_length       = undef;
        my $total_variation_1 = 0;
        my $total_variation_2 = 0;
        my @total_variation_2 = ( 0, 0 );

        foreach my $j ( 0 .. $item_count - 1 ) {

            $is_odd = 1 - $is_odd;
            my $length = $ritem_lengths->[$j];
            if ( $length > $max_length[$is_odd] ) {
                $max_length[$is_odd] = $length;
            }

            if ( defined($last_length) ) {
                my $dl = abs( $length - $last_length );
                $total_variation_1 += $dl;
            }
            $last_length = $length;

            my $ll = $last_length_2[$is_odd];
            if ( defined($ll) ) {
                my $dl = abs( $length - $ll );
                $total_variation_2[$is_odd] += $dl;
            }
            else {
                $first_length_2[$is_odd] = $length;
            }
            $last_length_2[$is_odd] = $length;
        }
        $total_variation_2 = $total_variation_2[0] + $total_variation_2[1];

        my $factor = ( $item_count > 10 ) ? 1 : ( $item_count > 5 ) ? 0.75 : 0;
        if ( $total_variation_2 >= $factor * $total_variation_1 ) {
            $number_of_fields_best = 1;
        }
    }
    return ($number_of_fields_best);
} ## end sub get_maximum_fields_wanted

sub table_columns_available {
    my $i_first_comma = shift;
    my $columns =
      $maximum_line_length_at_level[ $levels_to_go[$i_first_comma] ] -
      leading_spaces_to_go($i_first_comma);

    # Patch: the vertical formatter does not line up lines whose lengths
    # exactly equal the available line length because of allowances
    # that must be made for side comments.  Therefore, the number of
    # available columns is reduced by 1 character.
    $columns -= 1;
    return $columns;
} ## end sub table_columns_available

sub maximum_number_of_fields {

    # how many fields will fit in the available space?
    my ( $columns, $odd_or_even, $max_width, $pair_width ) = @_;
    my $max_pairs        = int( $columns / $pair_width );
    my $number_of_fields = $max_pairs * 2;
    if (   $odd_or_even == 1
        && $max_pairs * $pair_width + $max_width <= $columns )
    {
        $number_of_fields++;
    }
    return $number_of_fields;
} ## end sub maximum_number_of_fields

sub compactify_table {

    # given a table with a certain number of fields and a certain number
    # of lines, see if reducing the number of fields will make it look
    # better.
    my ( $item_count, $number_of_fields, $formatted_lines, $odd_or_even ) = @_;
    if ( $number_of_fields >= $odd_or_even * 2 && $formatted_lines > 0 ) {

        my $min_fields = $number_of_fields;

        while ($min_fields >= $odd_or_even
            && $min_fields * $formatted_lines >= $item_count )
        {
            $number_of_fields = $min_fields;
            $min_fields -= $odd_or_even;
        }
    }
    return $number_of_fields;
} ## end sub compactify_table

sub set_ragged_breakpoints {

    # Set breakpoints in a list that cannot be formatted nicely as a
    # table.
    my ( $self, $ri_term_comma, $ri_ragged_break_list ) = @_;

    my $break_count = 0;
    foreach ( @{$ri_ragged_break_list} ) {
        my $j = $ri_term_comma->[$_];
        if ($j) {
            $self->set_forced_breakpoint($j);
            $break_count++;
        }
    }
    return $break_count;
} ## end sub set_ragged_breakpoints

sub copy_old_breakpoints {
    my ( $self, $i_first_comma, $i_last_comma ) = @_;

    # We are formatting a list and have decided to make comma breaks
    # the same as in the input file.
    for my $i ( $i_first_comma .. $i_last_comma ) {
        if ( $old_breakpoint_to_go[$i] ) {

            # If the comma style is under certain controls, and if this is a
            # comma breakpoint with the comma is at the beginning of the next
            # line, then we must pass that index instead. This will allow sub
            # set_forced_breakpoints to check and follow the user settings. This
            # produces a uniform style and can prevent instability (b1422).
            #
            # The flag '$controlled_comma_style' will be set if the user
            # entered any of -wbb=',' -wba=',' -kbb=',' -kba=','.  It is not
            # needed or set for the -boc flag.
            my $ibreak = $i;
            if ( $types_to_go[$ibreak] ne ',' && $controlled_comma_style ) {
                my $index = $inext_to_go[$ibreak];
                if ( $index > $ibreak && $types_to_go[$index] eq ',' ) {
                    $ibreak = $index;
                }
            }
            $self->set_forced_breakpoint($ibreak);
        }
    }
    return;
} ## end sub copy_old_breakpoints

sub set_nobreaks {
    my ( $self, $i, $j ) = @_;
    if ( $i >= 0 && $i <= $j && $j <= $max_index_to_go ) {

        0 && do {
            my ( $a, $b, $c ) = caller();
            print {*STDOUT}
"NOBREAK: forced_breakpoint $forced_breakpoint_count from $a $c with i=$i max=$max_index_to_go type=$types_to_go[$i]\n";
        };

        @nobreak_to_go[ $i .. $j ] = (1) x ( $j - $i + 1 );
    }

    # shouldn't happen; non-critical error
    else {
        if (DEVEL_MODE) {
            my ( $a, $b, $c ) = caller();
            Fault(<<EOM);
NOBREAK ERROR: from $a $c with i=$i j=$j max=$max_index_to_go
EOM
        }
    }
    return;
} ## end sub set_nobreaks

###############################################
# CODE SECTION 12: Code for setting indentation
###############################################

sub token_sequence_length {

    # return length of tokens ($ibeg .. $iend) including $ibeg & $iend
    my ( $ibeg, $iend ) = @_;

    # fix possible negative starting index
    if ( $ibeg < 0 ) { $ibeg = 0 }

    # returns 0 if index range is empty (some subs assume this)
    if ( $ibeg > $iend ) {
        return 0;
    }

    return $summed_lengths_to_go[ $iend + 1 ] - $summed_lengths_to_go[$ibeg];
} ## end sub token_sequence_length

sub total_line_length {

    # return length of a line of tokens ($ibeg .. $iend)
    my ( $ibeg, $iend ) = @_;

    # get the leading spaces on this line ...
    my $spaces = $leading_spaces_to_go[$ibeg];
    if ( ref($spaces) ) { $spaces = $spaces->get_spaces() }

    # ... then add the net token length
    return $spaces + $summed_lengths_to_go[ $iend + 1 ] -
      $summed_lengths_to_go[$ibeg];

} ## end sub total_line_length

sub excess_line_length {

    # return number of characters by which a line of tokens ($ibeg..$iend)
    # exceeds the allowable line length.
    # NOTE: profiling shows that efficiency of this routine is essential.

    my ( $self, $ibeg, $iend, $ignore_right_weld ) = @_;

    # Start with the leading spaces on this line ...
    my $excess = $leading_spaces_to_go[$ibeg];
    if ( ref($excess) ) { $excess = $excess->get_spaces() }

    # ... and include right weld lengths unless requested not to
    if (   $total_weld_count
        && $type_sequence_to_go[$iend]
        && !$ignore_right_weld )
    {
        my $wr = $self->[_rweld_len_right_at_K_]->{ $K_to_go[$iend] };
        $excess += $wr if defined($wr);
    }

    # ... then add the net token length, minus the maximum length
    return $excess +
      $summed_lengths_to_go[ $iend + 1 ] -
      $summed_lengths_to_go[$ibeg] -
      $maximum_line_length_at_level[ $levels_to_go[$ibeg] ];

} ## end sub excess_line_length

sub get_spaces {

    # return the number of leading spaces associated with an indentation
    # variable $indentation is either a constant number of spaces or an object
    # with a get_spaces method.
    my $indentation = shift;
    return ref($indentation) ? $indentation->get_spaces() : $indentation;
} ## end sub get_spaces

sub get_recoverable_spaces {

    # return the number of spaces (+ means shift right, - means shift left)
    # that we would like to shift a group of lines with the same indentation
    # to get them to line up with their opening parens
    my $indentation = shift;
    return ref($indentation) ? $indentation->get_recoverable_spaces() : 0;
} ## end sub get_recoverable_spaces

sub get_available_spaces_to_go {

    my ( $self, $ii ) = @_;
    my $item = $leading_spaces_to_go[$ii];

    # return the number of available leading spaces associated with an
    # indentation variable.  $indentation is either a constant number of
    # spaces or an object with a get_available_spaces method.
    return ref($item) ? $item->get_available_spaces() : 0;
} ## end sub get_available_spaces_to_go

{    ## begin closure set_lp_indentation

    use constant DEBUG_LP => 0;

    # Stack of -lp index objects which survives between batches.
    my $rLP;
    my $max_lp_stack;

    # The predicted position of the next opening container which may start
    # an -lp indentation level.  This survives between batches.
    my $lp_position_predictor;

    BEGIN {

        # Index names for the -lp stack variables.
        # Do not combine with other BEGIN blocks (c101).

        my $i = 0;
        use constant {
            _lp_ci_level_        => $i++,
            _lp_level_           => $i++,
            _lp_object_          => $i++,
            _lp_container_seqno_ => $i++,
            _lp_space_count_     => $i++,
        };
    } ## end BEGIN

    sub initialize_lp_vars {

        # initialize gnu variables for a new file;
        # must be called once at the start of a new file.

        $lp_position_predictor = 0;
        $max_lp_stack          = 0;

        # we can turn off -lp if all levels will be at or above the cutoff
        if ( $high_stress_level <= 1 ) {
            $rOpts_line_up_parentheses          = 0;
            $rOpts_extended_line_up_parentheses = 0;
        }

        # fix for b1459: -naws adds stress for -xlp
        if ( $high_stress_level <= 2 && !$rOpts_add_whitespace ) {
            $rOpts_extended_line_up_parentheses = 0;
        }

        $rLP = [];

        # initialize the leading whitespace stack to negative levels
        # so that we can never run off the end of the stack
        $rLP->[$max_lp_stack]->[_lp_ci_level_]        = -1;
        $rLP->[$max_lp_stack]->[_lp_level_]           = -1;
        $rLP->[$max_lp_stack]->[_lp_object_]          = undef;
        $rLP->[$max_lp_stack]->[_lp_container_seqno_] = SEQ_ROOT;
        $rLP->[$max_lp_stack]->[_lp_space_count_]     = 0;

        return;
    } ## end sub initialize_lp_vars

    # hashes for efficient testing
    my %hash_test1;
    my %hash_test2;
    my %hash_test3;

    BEGIN {
        my @q = qw< } ) ] >;
        @hash_test1{@q} = (1) x scalar(@q);
        @q = qw(: ? f);
        push @q, ',';
        @hash_test2{@q} = (1) x scalar(@q);
        @q              = qw( . || && );
        @hash_test3{@q} = (1) x scalar(@q);
    } ## end BEGIN

    # shared variables, re-initialized for each batch
    my $rlp_object_list;
    my $max_lp_object_list;
    my %lp_comma_count;
    my %lp_arrow_count;
    my $space_count;
    my $current_level;
    my $current_ci_level;
    my $ii_begin_line;
    my $in_lp_mode;
    my $stack_changed;
    my $K_last_nonblank;
    my $last_nonblank_token;
    my $last_nonblank_type;
    my $last_last_nonblank_type;

    sub set_lp_indentation {

        my ($self) = @_;

        #------------------------------------------------------------------
        # Define the leading whitespace for all tokens in the current batch
        # when the -lp formatting is selected.
        #------------------------------------------------------------------

        # Returns number of tokens in this batch which have leading spaces
        # defined by an lp object:
        my $lp_object_count_this_batch = 0;

        # Safety check, should not be needed:
        if (   !$rOpts_line_up_parentheses
            || !defined($max_index_to_go)
            || $max_index_to_go < 0 )
        {
            return $lp_object_count_this_batch;
        }

        # List of -lp indentation objects created in this batch
        $rlp_object_list    = [];
        $max_lp_object_list = -1;

        %lp_comma_count          = ();
        %lp_arrow_count          = ();
        $space_count             = undef;
        $current_level           = undef;
        $current_ci_level        = undef;
        $ii_begin_line           = 0;
        $in_lp_mode              = 0;
        $stack_changed           = 1;
        $K_last_nonblank         = undef;
        $last_nonblank_token     = EMPTY_STRING;
        $last_nonblank_type      = EMPTY_STRING;
        $last_last_nonblank_type = EMPTY_STRING;

        my %last_lp_equals = ();

        my $rLL               = $self->[_rLL_];
        my $starting_in_quote = $self->[_this_batch_]->[_starting_in_quote_];

        my $imin = 0;

        # The 'starting_in_quote' flag means that the first token is the first
        # token of a line and it is also the continuation of some kind of
        # multi-line quote or pattern.  It must have no added leading
        # whitespace, so we can skip it.
        if ($starting_in_quote) {
            $imin += 1;
        }

        my $Kpnb = $K_to_go[0] - 1;
        if ( $Kpnb > 0 && $rLL->[$Kpnb]->[_TYPE_] eq 'b' ) {
            $Kpnb -= 1;
        }
        if ( $Kpnb >= 0 && $rLL->[$Kpnb]->[_TYPE_] ne 'b' ) {
            $K_last_nonblank = $Kpnb;
        }

        if ( defined($K_last_nonblank) ) {
            $last_nonblank_token = $rLL->[$K_last_nonblank]->[_TOKEN_];
            $last_nonblank_type  = $rLL->[$K_last_nonblank]->[_TYPE_];
        }

        #-----------------------------------
        # Loop over all tokens in this batch
        #-----------------------------------
        foreach my $ii ( $imin .. $max_index_to_go ) {

            my $type        = $types_to_go[$ii];
            my $token       = $tokens_to_go[$ii];
            my $level       = $levels_to_go[$ii];
            my $ci_level    = $ci_levels_to_go[$ii];
            my $total_depth = $nesting_depth_to_go[$ii];

            # get the top state from the stack if it has changed
            if ($stack_changed) {
                my $rLP_top   = $rLP->[$max_lp_stack];
                my $lp_object = $rLP_top->[_lp_object_];
                if ($lp_object) {
                    ( $space_count, $current_level, $current_ci_level ) =
                      @{ $lp_object->get_spaces_level_ci() };
                }
                else {
                    $current_ci_level = $rLP_top->[_lp_ci_level_];
                    $current_level    = $rLP_top->[_lp_level_];
                    $space_count      = $rLP_top->[_lp_space_count_];
                }
                $stack_changed = 0;
            }

            #------------------------------------------------------------
            # Break at a previous '=' if necessary to control line length
            #------------------------------------------------------------
            if ( $type eq '{' || $type eq '(' ) {
                $lp_comma_count{ $total_depth + 1 } = 0;
                $lp_arrow_count{ $total_depth + 1 } = 0;

                # If we come to an opening token after an '=' token of some
                # type, see if it would be helpful to 'break' after the '=' to
                # save space
                my $ii_last_equals = $last_lp_equals{$total_depth};
                if ($ii_last_equals) {
                    $self->lp_equals_break_check( $ii, $ii_last_equals );
                }
            }

            #------------------------
            # Handle decreasing depth
            #------------------------
            # Note that one token may have both decreasing and then increasing
            # depth. For example, (level, ci) can go from (1,1) to (2,0).  So,
            # in this example we would first go back to (1,0) then up to (2,0)
            # in a single call.
            if ( $level < $current_level || $ci_level < $current_ci_level ) {
                $self->lp_decreasing_depth($ii);
            }

            #------------------------
            # handle increasing depth
            #------------------------
            if ( $level > $current_level || $ci_level > $current_ci_level ) {
                $self->lp_increasing_depth($ii);
            }

            #------------------
            # Handle all tokens
            #------------------
            if ( $type ne 'b' ) {

                # Count commas and look for non-list characters.  Once we see a
                # non-list character, we give up and don't look for any more
                # commas.
                if ( $type eq '=>' ) {
                    $lp_arrow_count{$total_depth}++;

                    # remember '=>' like '=' for estimating breaks (but see
                    # above note for b1035)
                    $last_lp_equals{$total_depth} = $ii;
                }

                elsif ( $type eq ',' ) {
                    $lp_comma_count{$total_depth}++;
                }

                elsif ( $is_assignment{$type} ) {
                    $last_lp_equals{$total_depth} = $ii;
                }
                else {
                    ## not a special type
                }

                # this token might start a new line if ..
                if (
                    $ii > $ii_begin_line

                    && (

                        # this is the first nonblank token of the line
                        $ii == 1 && $types_to_go[0] eq 'b'

                        # or previous character was one of these:
                        #  /^([\:\?\,f])$/
                        || $hash_test2{$last_nonblank_type}

                        # or previous character was opening and this is not
                        # closing
                        || ( $last_nonblank_type eq '{' && $type ne '}' )
                        || ( $last_nonblank_type eq '(' and $type ne ')' )

                        # or this token is one of these:
                        #  /^([\.]|\|\||\&\&)$/
                        || $hash_test3{$type}

                        # or this is a closing structure
                        || (   $last_nonblank_type eq '}'
                            && $last_nonblank_token eq $last_nonblank_type )

                        # or previous token was keyword 'return'
                        || (
                            $last_nonblank_type eq 'k'
                            && (   $last_nonblank_token eq 'return'
                                && $type ne '{' )
                        )

                        # or starting a new line at certain keywords is fine
                        || ( $type eq 'k'
                            && $is_if_unless_and_or_last_next_redo_return{
                                $token} )

                        # or this is after an assignment after a closing
                        # structure
                        || (
                            $is_assignment{$last_nonblank_type}
                            && (
                                # /^[\}\)\]]$/
                                $hash_test1{$last_last_nonblank_type}

                                # and it is significantly to the right
                                || $lp_position_predictor > (
                                    $maximum_line_length_at_level[$level] -
                                      $rOpts_maximum_line_length / 2
                                )
                            )
                        )
                    )
                  )
                {
                    check_for_long_gnu_style_lines($ii);
                    $ii_begin_line = $ii;

                    # back up 1 token if we want to break before that type
                    # otherwise, we may strand tokens like '?' or ':' on a line
                    if ( $ii_begin_line > 0 ) {
                        my $wbb =
                            $last_nonblank_type eq 'k'
                          ? $want_break_before{$last_nonblank_token}
                          : $want_break_before{$last_nonblank_type};
                        $ii_begin_line-- if ($wbb);
                    }
                }

                $K_last_nonblank         = $K_to_go[$ii];
                $last_last_nonblank_type = $last_nonblank_type;
                $last_nonblank_type      = $type;
                $last_nonblank_token     = $token;

            } ## end if ( $type ne 'b' )

            # remember the predicted position of this token on the output line
            if ( $ii > $ii_begin_line ) {

                ## NOTE: this is a critical loop - the following call has been
                ## expanded for about 2x speedup:
                ## $lp_position_predictor =
                ##    total_line_length( $ii_begin_line, $ii );

                my $indentation = $leading_spaces_to_go[$ii_begin_line];
                if ( ref($indentation) ) {
                    $indentation = $indentation->get_spaces();
                }
                $lp_position_predictor =
                  $indentation +
                  $summed_lengths_to_go[ $ii + 1 ] -
                  $summed_lengths_to_go[$ii_begin_line];
            }
            else {
                $lp_position_predictor =
                  $space_count + $token_lengths_to_go[$ii];
            }

            # Store the indentation object for this token.
            # This allows us to manipulate the leading whitespace
            # (in case we have to reduce indentation to fit a line) without
            # having to change any token values.

            #---------------------------------------------------------------
            # replace leading whitespace with indentation objects where used
            #---------------------------------------------------------------
            if ( $rLP->[$max_lp_stack]->[_lp_object_] ) {
                $lp_object_count_this_batch++;
                my $lp_object = $rLP->[$max_lp_stack]->[_lp_object_];
                $leading_spaces_to_go[$ii] = $lp_object;
                if (   $max_lp_stack > 0
                    && $ci_level
                    && $rLP->[ $max_lp_stack - 1 ]->[_lp_object_] )
                {
                    $reduced_spaces_to_go[$ii] =
                      $rLP->[ $max_lp_stack - 1 ]->[_lp_object_];
                }
                else {
                    $reduced_spaces_to_go[$ii] = $lp_object;
                }
            }
        } ## end loop over all tokens in this batch

        undo_incomplete_lp_indentation()
          if ( !$rOpts_extended_line_up_parentheses );

        return $lp_object_count_this_batch;
    } ## end sub set_lp_indentation

    sub lp_equals_break_check {

        my ( $self, $ii, $ii_last_equals ) = @_;

        # If we come to an opening token after an '=' token of some
        # type, see if it would be helpful to 'break' after the '=' to
        # save space.

        # Given:
        #   $ii = index of an opening token in the output batch
        #   $ii_begin_line = index of token starting next output line
        # Update:
        #   $lp_position_predictor - updated position predictor
        #   $ii_begin_line = updated starting token index

        # Skip an empty set of parens, such as after channel():
        #   my $exchange = $self->_channel()->exchange(
        # This fixes issues b1318 b1322 b1323 b1328
        my $is_empty_container;
        if ( $ii_last_equals && $ii < $max_index_to_go ) {
            my $seqno    = $type_sequence_to_go[$ii];
            my $inext_nb = $ii + 1;
            $inext_nb++
              if ( $types_to_go[$inext_nb] eq 'b' );
            my $seqno_nb = $type_sequence_to_go[$inext_nb];
            $is_empty_container = $seqno && $seqno_nb && $seqno_nb == $seqno;
        }

        if (   $ii_last_equals
            && $ii_last_equals > $ii_begin_line
            && !$is_empty_container )
        {

            my $seqno = $type_sequence_to_go[$ii];

            # find the position if we break at the '='
            my $i_test = $ii_last_equals;

            # Fix for issue b1229, check if want break before this token
            # Fix for issue b1356, if i_test is a blank, the leading spaces may
            #   be incorrect (if it was an interline blank).
            # Fix for issue b1357 .. b1370, i_test must be prev nonblank
            #   ( the ci value for blanks can vary )
            # See also case b223
            # Fix for issue b1371-b1374 : all of these and the above are fixed
            # by simply backing up one index and setting the leading spaces of
            # a blank equal to that of the equals.
            if ( $want_break_before{ $types_to_go[$i_test] } ) {
                $i_test -= 1;
                $leading_spaces_to_go[$i_test] =
                  $leading_spaces_to_go[$ii_last_equals]
                  if ( $types_to_go[$i_test] eq 'b' );
            }
            elsif ( $types_to_go[ $i_test + 1 ] eq 'b' ) { $i_test++ }
            else {
                ## ok
            }

            my $test_position = total_line_length( $i_test, $ii );
            my $mll = $maximum_line_length_at_level[ $levels_to_go[$i_test] ];

            #------------------------------------------------------
            # Break if structure will reach the maximum line length
            #------------------------------------------------------

            # Historically, -lp just used one-half line length here
            my $len_increase = $rOpts_maximum_line_length / 2;

            # For -xlp, we can also use the pre-computed lengths
            my $min_len = $self->[_rcollapsed_length_by_seqno_]->{$seqno};
            if ( $min_len && $min_len > $len_increase ) {
                $len_increase = $min_len;
            }

            if (

                # if we might exceed the maximum line length
                $lp_position_predictor + $len_increase > $mll

                # if a -bbx flag WANTS a break before this opening token
                || (   $seqno
                    && $self->[_rbreak_before_container_by_seqno_]->{$seqno} )

                # or we are beyond the 1/4 point and there was an old
                # break at an assignment (not '=>') [fix for b1035]
                || (
                    $lp_position_predictor >
                    $mll - $rOpts_maximum_line_length * 3 / 4
                    && $types_to_go[$ii_last_equals] ne '=>'
                    && (
                        $old_breakpoint_to_go[$ii_last_equals]
                        || (   $ii_last_equals > 0
                            && $old_breakpoint_to_go[ $ii_last_equals - 1 ] )
                        || (   $ii_last_equals > 1
                            && $types_to_go[ $ii_last_equals - 1 ] eq 'b'
                            && $old_breakpoint_to_go[ $ii_last_equals - 2 ] )
                    )
                )
              )
            {

                # then make the switch -- note that we do not set a
                # real breakpoint here because we may not really need
                # one; sub break_lists will do that if necessary.

                my $Kc = $self->[_K_closing_container_]->{$seqno};
                if (

                    # For -lp, only if the closing token is in this
                    # batch (c117).  Otherwise it cannot be done by sub
                    # break_lists.
                    defined($Kc) && $Kc <= $K_to_go[$max_index_to_go]

                    # For -xlp, we only need one nonblank token after
                    # the opening token.
                    || $rOpts_extended_line_up_parentheses
                  )
                {
                    $ii_begin_line         = $i_test + 1;
                    $lp_position_predictor = $test_position;

                    #--------------------------------------------------
                    # Fix for an opening container terminating a batch:
                    #--------------------------------------------------
                    # To get alignment of a -lp container with its
                    # contents, we have to put a break after $i_test.
                    # For $ii<$max_index_to_go, this will be done by
                    # sub break_lists based on the indentation object.
                    # But for $ii=$max_index_to_go, the indentation
                    # object for this seqno will not be created until
                    # the next batch, so we have to set a break at
                    # $i_test right now in order to get one.
                    if (   $ii == $max_index_to_go
                        && !$block_type_to_go[$ii]
                        && $types_to_go[$ii] eq '{'
                        && $seqno
                        && !$self->[_ris_excluded_lp_container_]->{$seqno} )
                    {
                        $self->set_forced_lp_break( $ii_begin_line, $ii );
                    }
                }
            }
        }
        return;
    } ## end sub lp_equals_break_check

    sub lp_decreasing_depth {
        my ( $self, $ii ) = @_;

        my $rLL = $self->[_rLL_];

        my $level    = $levels_to_go[$ii];
        my $ci_level = $ci_levels_to_go[$ii];

        # loop to find the first entry at or completely below this level
        while (1) {

            # Be sure we have not hit the stack bottom - should never
            # happen because only negative levels can get here, and
            # $level was forced to be positive above.
            if ( !$max_lp_stack ) {

                # non-fatal, just keep going except in DEVEL_MODE
                if (DEVEL_MODE) {
                    Fault(<<EOM);
program bug with -lp: stack_error. level=$level; ci_level=$ci_level; rerun with -nlp
EOM
                }
                last;
            }

            # save index of token which closes this level
            if ( $rLP->[$max_lp_stack]->[_lp_object_] ) {
                my $lp_object = $rLP->[$max_lp_stack]->[_lp_object_];

                $lp_object->set_closed($ii);

                my $comma_count = 0;
                my $arrow_count = 0;
                my $type        = $types_to_go[$ii];
                if ( $type eq '}' || $type eq ')' ) {
                    my $total_depth = $nesting_depth_to_go[$ii];
                    $comma_count = $lp_comma_count{$total_depth};
                    $arrow_count = $lp_arrow_count{$total_depth};
                    $comma_count = 0 unless $comma_count;
                    $arrow_count = 0 unless $arrow_count;
                }

                $lp_object->set_comma_count($comma_count);
                $lp_object->set_arrow_count($arrow_count);

                # Undo any extra indentation if we saw no commas
                my $available_spaces = $lp_object->get_available_spaces();
                my $K_start          = $lp_object->get_K_begin_line();

                if (   $available_spaces > 0
                    && $K_start >= $K_to_go[0]
                    && ( $comma_count <= 0 || $arrow_count > 0 ) )
                {

                    my $i = $lp_object->get_lp_item_index();

                    # Safety check for a valid stack index. It
                    # should be ok because we just checked that the
                    # index K of the token associated with this
                    # indentation is in this batch.
                    if ( $i < 0 || $i > $max_lp_object_list ) {
                        my $KK  = $K_to_go[$ii];
                        my $lno = $rLL->[$KK]->[_LINE_INDEX_];
                        DEVEL_MODE && Fault(<<EOM);
Program bug with -lp near line $lno.  Stack index i=$i should be >=0 and <= max=$max_lp_object_list
EOM
                        last;
                    }

                    if ( $arrow_count == 0 ) {
                        $rlp_object_list->[$i]
                          ->permanently_decrease_available_spaces(
                            $available_spaces);
                    }
                    else {
                        $rlp_object_list->[$i]
                          ->tentatively_decrease_available_spaces(
                            $available_spaces);
                    }
                    foreach my $j ( $i + 1 .. $max_lp_object_list ) {
                        $rlp_object_list->[$j]
                          ->decrease_SPACES($available_spaces);
                    }
                }
            }

            # go down one level
            --$max_lp_stack;

            my $rLP_top = $rLP->[$max_lp_stack];
            my $ci_lev  = $rLP_top->[_lp_ci_level_];
            my $lev     = $rLP_top->[_lp_level_];
            my $spaces  = $rLP_top->[_lp_space_count_];
            if ( $rLP_top->[_lp_object_] ) {
                my $lp_obj = $rLP_top->[_lp_object_];
                ( $spaces, $lev, $ci_lev ) =
                  @{ $lp_obj->get_spaces_level_ci() };
            }

            # stop when we reach a level at or below the current
            # level
            if ( $lev <= $level && $ci_lev <= $ci_level ) {
                $space_count      = $spaces;
                $current_level    = $lev;
                $current_ci_level = $ci_lev;
                last;
            }
        }
        return;
    } ## end sub lp_decreasing_depth

    sub lp_increasing_depth {
        my ( $self, $ii ) = @_;

        my $rLL = $self->[_rLL_];

        my $type     = $types_to_go[$ii];
        my $level    = $levels_to_go[$ii];
        my $ci_level = $ci_levels_to_go[$ii];

        $stack_changed = 1;

        # Compute the standard incremental whitespace.  This will be
        # the minimum incremental whitespace that will be used.  This
        # choice results in a smooth transition between the gnu-style
        # and the standard style.
        my $standard_increment =
          ( $level - $current_level ) * $rOpts_indent_columns +
          ( $ci_level - $current_ci_level ) * $rOpts_continuation_indentation;

        # Now we have to define how much extra incremental space
        # ("$available_space") we want.  This extra space will be
        # reduced as necessary when long lines are encountered or when
        # it becomes clear that we do not have a good list.
        my $available_spaces = 0;
        my $align_seqno      = 0;
        my $K_extra_space;

        my $last_nonblank_seqno;
        my $last_nonblank_block_type;
        if ( defined($K_last_nonblank) ) {
            $last_nonblank_seqno = $rLL->[$K_last_nonblank]->[_TYPE_SEQUENCE_];
            $last_nonblank_block_type =
                $last_nonblank_seqno
              ? $self->[_rblock_type_of_seqno_]->{$last_nonblank_seqno}
              : undef;
        }

        $in_lp_mode = $rLP->[$max_lp_stack]->[_lp_object_];

        #-----------------------------------------------
        # Initialize indentation spaces on empty stack..
        #-----------------------------------------------
        if ( $max_lp_stack == 0 ) {
            $space_count = $level * $rOpts_indent_columns;
        }

        #----------------------------------------
        # Add the standard space increment if ...
        #----------------------------------------
        elsif (

            # if this is a BLOCK, add the standard increment
            $last_nonblank_block_type

            # or if this is not a sequenced item
            || !$last_nonblank_seqno

            # or this container is excluded by user rules
            # or contains here-docs or multiline qw text
            || defined($last_nonblank_seqno)
            && $self->[_ris_excluded_lp_container_]->{$last_nonblank_seqno}

            # or if last nonblank token was not structural indentation
            || $last_nonblank_type ne '{'

            # and do not start -lp under stress .. fixes b1244, b1255
            || !$in_lp_mode && $level >= $high_stress_level

          )
        {

            # If we have entered lp mode, use the top lp object to get
            # the current indentation spaces because it may have
            # changed.  Fixes b1285, b1286.
            if ($in_lp_mode) {
                $space_count = $in_lp_mode->get_spaces();
            }
            $space_count += $standard_increment;
        }

        #---------------------------------------------------------------
        # -lp mode: try to use space to the first non-blank level change
        #---------------------------------------------------------------
        else {

            # see how much space we have available
            my $test_space_count = $lp_position_predictor;
            my $excess           = 0;
            my $min_len =
              $self->[_rcollapsed_length_by_seqno_]->{$last_nonblank_seqno};
            my $next_opening_too_far;

            if ( defined($min_len) ) {
                $excess =
                  $test_space_count +
                  $min_len -
                  $maximum_line_length_at_level[$level];
                if ( $excess > 0 ) {
                    $test_space_count -= $excess;

                    # will the next opening token be a long way out?
                    $next_opening_too_far =
                      $lp_position_predictor + $excess >
                      $maximum_line_length_at_level[$level];
                }
            }

            my $rLP_top             = $rLP->[$max_lp_stack];
            my $min_gnu_indentation = $rLP_top->[_lp_space_count_];
            if ( $rLP_top->[_lp_object_] ) {
                $min_gnu_indentation = $rLP_top->[_lp_object_]->get_spaces();
            }
            $available_spaces = $test_space_count - $min_gnu_indentation;

            # Do not startup -lp indentation mode if no space ...
            # ... or if it puts the opening far to the right
            if ( !$in_lp_mode
                && ( $available_spaces <= 0 || $next_opening_too_far ) )
            {
                $space_count += $standard_increment;
                $available_spaces = 0;
            }

            # Use -lp mode
            else {
                $space_count = $test_space_count;

                $in_lp_mode = 1;
                if ( $available_spaces >= $standard_increment ) {
                    $min_gnu_indentation += $standard_increment;
                }
                elsif ( $available_spaces > 1 ) {
                    $min_gnu_indentation += $available_spaces + 1;

                    # The "+1" space can cause mis-alignment if there is no
                    # blank space between the opening paren and the next
                    # nonblank token (i.e., -pt=2) and the container does not
                    # get broken open.  So we will mark this token for later
                    # space removal by sub 'xlp_tweak' if this container
                    # remains intact (issue git #106).
                    if (
                        $type ne 'b'

                        # Skip if the maximum line length is exceeded here
                        && $excess <= 0

                        # This is only for level changes, not ci level changes.
                        # But note: this test is here out of caution but I have
                        # not found a case where it is actually necessary.
                        && $is_opening_token{$last_nonblank_token}

                        # Be sure we are at consecutive nonblanks.  This test
                        # should be true, but it guards against future coding
                        # changes to level values assigned to blank spaces.
                        && $ii > 0
                        && $types_to_go[ $ii - 1 ] ne 'b'

                      )
                    {
                        $K_extra_space = $K_to_go[$ii];
                    }
                }
                elsif ( $is_opening_token{$last_nonblank_token} ) {
                    if ( ( $tightness{$last_nonblank_token} < 2 ) ) {
                        $min_gnu_indentation += 2;
                    }
                    else {
                        $min_gnu_indentation += 1;
                    }
                }
                else {
                    $min_gnu_indentation += $standard_increment;
                }
                $available_spaces = $space_count - $min_gnu_indentation;

                if ( $available_spaces < 0 ) {
                    $space_count      = $min_gnu_indentation;
                    $available_spaces = 0;
                }
                $align_seqno = $last_nonblank_seqno;
            }
        }

        #-------------------------------------------
        # update the state, but not on a blank token
        #-------------------------------------------
        if ( $type ne 'b' ) {

            if ( $rLP->[$max_lp_stack]->[_lp_object_] ) {
                $rLP->[$max_lp_stack]->[_lp_object_]->set_have_child(1);
                $in_lp_mode = 1;
            }

            #----------------------------------------
            # Create indentation object if in lp-mode
            #----------------------------------------
            ++$max_lp_stack;
            my $lp_object;
            if ($in_lp_mode) {

                # A negative level implies not to store the item in the
                # item_list
                my $lp_item_index = 0;
                if ( $level >= 0 ) {
                    $lp_item_index = ++$max_lp_object_list;
                }

                my $K_begin_line = 0;
                if (   $ii_begin_line >= 0
                    && $ii_begin_line <= $max_index_to_go )
                {
                    $K_begin_line = $K_to_go[$ii_begin_line];
                }

                # Minor Fix: when creating indentation at a side
                # comment we don't know what the space to the actual
                # next code token will be.  We will allow a space for
                # sub correct_lp to move it in if necessary.
                if (   $type eq '#'
                    && $max_index_to_go > 0
                    && $align_seqno )
                {
                    $available_spaces += 1;
                }

                my $standard_spaces = $leading_spaces_to_go[$ii];
                $lp_object = Perl::Tidy::IndentationItem->new(
                    spaces           => $space_count,
                    level            => $level,
                    ci_level         => $ci_level,
                    available_spaces => $available_spaces,
                    lp_item_index    => $lp_item_index,
                    align_seqno      => $align_seqno,
                    K_begin_line     => $K_begin_line,
                    standard_spaces  => $standard_spaces,
                    K_extra_space    => $K_extra_space,
                );

                DEBUG_LP && do {
                    my $tok_beg = $rLL->[$K_begin_line]->[_TOKEN_];
                    my $token   = $tokens_to_go[$ii];
                    print {*STDOUT} <<EOM;
DEBUG_LP: Created object at tok=$token type=$type for seqno $align_seqno level=$level ci=$ci_level spaces=$space_count avail=$available_spaces kbeg=$K_begin_line tokbeg=$tok_beg lp=$lp_position_predictor
EOM
                };

                if ( $level >= 0 ) {
                    $rlp_object_list->[$max_lp_object_list] = $lp_object;
                }

                if (   $is_opening_token{$last_nonblank_token}
                    && $last_nonblank_seqno )
                {
                    $self->[_rlp_object_by_seqno_]->{$last_nonblank_seqno} =
                      $lp_object;
                }
            }

            #------------------------------------
            # Store this indentation on the stack
            #------------------------------------
            $rLP->[$max_lp_stack]->[_lp_ci_level_] = $ci_level;
            $rLP->[$max_lp_stack]->[_lp_level_]    = $level;
            $rLP->[$max_lp_stack]->[_lp_object_]   = $lp_object;
            $rLP->[$max_lp_stack]->[_lp_container_seqno_] =
              $last_nonblank_seqno;
            $rLP->[$max_lp_stack]->[_lp_space_count_] = $space_count;

            # If the opening paren is beyond the half-line length, then
            # we will use the minimum (standard) indentation.  This will
            # help avoid problems associated with running out of space
            # near the end of a line.  As a result, in deeply nested
            # lists, there will be some indentations which are limited
            # to this minimum standard indentation. But the most deeply
            # nested container will still probably be able to shift its
            # parameters to the right for proper alignment, so in most
            # cases this will not be noticeable.
            if ( $available_spaces > 0 && $lp_object ) {
                my $halfway =
                  $maximum_line_length_at_level[$level] -
                  $rOpts_maximum_line_length / 2;
                $lp_object->tentatively_decrease_available_spaces(
                    $available_spaces)
                  if ( $space_count > $halfway );
            }
        }
        return;
    } ## end sub lp_increasing_depth

    sub check_for_long_gnu_style_lines {

        # look at the current estimated maximum line length, and
        # remove some whitespace if it exceeds the desired maximum
        my ($ii_to_go) = @_;

        # nothing can be done if no stack items defined for this line
        return if ( $max_lp_object_list < 0 );

        # See if we have exceeded the maximum desired line length ..
        # keep 2 extra free because they are needed in some cases
        # (result of trial-and-error testing)
        my $tol = 2;

        # But reduce tol to 0 at a terminal comma; fixes b1432
        if (   $tokens_to_go[$ii_to_go] eq ','
            && $ii_to_go < $max_index_to_go )
        {
            my $in = $ii_to_go + 1;
            if ( $types_to_go[$in] eq 'b' && $in < $max_index_to_go ) { $in++ }
            if ( $is_closing_token{ $tokens_to_go[$in] } ) {
                $tol = 0;
            }
        }

        my $spaces_needed =
          $lp_position_predictor -
          $maximum_line_length_at_level[ $levels_to_go[$ii_to_go] ] +
          $tol;

        return if ( $spaces_needed <= 0 );

        # We are over the limit, so try to remove a requested number of
        # spaces from leading whitespace.  We are only allowed to remove
        # from whitespace items created on this batch, since others have
        # already been used and cannot be undone.
        my @candidates = ();

        # loop over all whitespace items created for the current batch
        foreach my $i ( 0 .. $max_lp_object_list ) {
            my $item = $rlp_object_list->[$i];

            # item must still be open to be a candidate (otherwise it
            # cannot influence the current token)
            next if ( $item->get_closed() >= 0 );

            my $available_spaces = $item->get_available_spaces();

            if ( $available_spaces > 0 ) {
                push( @candidates, [ $i, $available_spaces ] );
            }
        }

        return unless (@candidates);

        # sort by available whitespace so that we can remove whitespace
        # from the maximum available first.
        @candidates =
          sort { $b->[1] <=> $a->[1] || $a->[0] <=> $b->[0] } @candidates;

        # keep removing whitespace until we are done or have no more
        foreach my $candidate (@candidates) {
            my ( $i, $available_spaces ) = @{$candidate};
            my $deleted_spaces =
              ( $available_spaces > $spaces_needed )
              ? $spaces_needed
              : $available_spaces;

            # remove the incremental space from this item
            $rlp_object_list->[$i]->decrease_available_spaces($deleted_spaces);

            my $i_debug = $i;

            # update the leading whitespace of this item and all items
            # that came after it
            $i -= 1;
            while ( ++$i <= $max_lp_object_list ) {

                my $old_spaces = $rlp_object_list->[$i]->get_spaces();
                if ( $old_spaces >= $deleted_spaces ) {
                    $rlp_object_list->[$i]->decrease_SPACES($deleted_spaces);
                }

                # shouldn't happen except for code bug:
                else {
                    # non-fatal, keep going except in DEVEL_MODE
                    if (DEVEL_MODE) {
                        my $level = $rlp_object_list->[$i_debug]->get_level();
                        my $ci_level =
                          $rlp_object_list->[$i_debug]->get_ci_level();
                        my $old_level = $rlp_object_list->[$i]->get_level();
                        my $old_ci_level =
                          $rlp_object_list->[$i]->get_ci_level();
                        Fault(<<EOM);
program bug with -lp: want to delete $deleted_spaces from item $i, but old=$old_spaces deleted: lev=$level ci=$ci_level  deleted: level=$old_level ci=$ci_level
EOM
                    }
                }
            }
            $lp_position_predictor -= $deleted_spaces;
            $spaces_needed         -= $deleted_spaces;
            last if ( $spaces_needed <= 0 );
        }
        return;
    } ## end sub check_for_long_gnu_style_lines

    sub undo_incomplete_lp_indentation {

        #------------------------------------------------------------------
        # Undo indentation for all incomplete -lp indentation levels of the
        # current batch unless -xlp is set.
        #------------------------------------------------------------------

        # This routine is called once after each output stream batch is
        # finished to undo indentation for all incomplete -lp indentation
        # levels.  If this routine is called then comments and blank lines will
        # disrupt this indentation style.  In older versions of perltidy this
        # was always done because it could cause problems otherwise, but recent
        # improvements allow fairly good results to be obtained by skipping
        # this step with the -xlp flag.

        # nothing to do if no stack items defined for this line
        return if ( $max_lp_object_list < 0 );

        # loop over all whitespace items created for the current batch
        foreach my $i ( 0 .. $max_lp_object_list ) {
            my $item = $rlp_object_list->[$i];

            # only look for open items
            next if ( $item->get_closed() >= 0 );

            # Tentatively remove all of the available space
            # (The vertical aligner will try to get it back later)
            my $available_spaces = $item->get_available_spaces();
            if ( $available_spaces > 0 ) {

                # delete incremental space for this item
                $rlp_object_list->[$i]
                  ->tentatively_decrease_available_spaces($available_spaces);

                # Reduce the total indentation space of any nodes that follow
                # Note that any such nodes must necessarily be dependents
                # of this node.
                foreach ( $i + 1 .. $max_lp_object_list ) {
                    $rlp_object_list->[$_]->decrease_SPACES($available_spaces);
                }
            }
        }
        return;
    } ## end sub undo_incomplete_lp_indentation
} ## end closure set_lp_indentation

#----------------------------------------------------------------------
# sub to set a requested break before an opening container in -lp mode.
#----------------------------------------------------------------------
sub set_forced_lp_break {

    my ( $self, $i_begin_line, $i_opening ) = @_;

    # Given:
    #   $i_begin_line = index of break in the _to_go arrays
    #   $i_opening = index of the opening container

    # Set any requested break at a token before this opening container
    # token. This is often an '=' or '=>' but can also be things like
    # '.', ',', 'return'.  It was defined by sub set_lp_indentation.

    # Important:
    #   For intact containers, call this at the closing token.
    #   For broken containers, call this at the opening token.
    # This will avoid needless breaks when it turns out that the
    # container does not actually get broken.  This isn't known until
    # the closing container for intact blocks.

    return
      if ( $i_begin_line < 0
        || $i_begin_line > $max_index_to_go );

    # Handle request to put a break break immediately before this token.
    # We may not want to do that since we are also breaking after it.
    if ( $i_begin_line == $i_opening ) {

        # The following rules should be reviewed.  We may want to always
        # allow the break.  If we do not do the break, the indentation
        # may be off.

        # RULE: don't break before it unless it is welded to a qw.
        # This works well, but we may want to relax this to allow
        # breaks in additional cases.
        return
          if ( !$self->[_rK_weld_right_]->{ $K_to_go[$i_opening] } );
        return unless ( $types_to_go[$max_index_to_go] eq 'q' );
    }

    # Only break for breakpoints at the same
    # indentation level as the opening paren
    my $test1 = $nesting_depth_to_go[$i_opening];
    my $test2 = $nesting_depth_to_go[$i_begin_line];
    return if ( $test2 != $test1 );

    # Back up at a blank (fixes case b932)
    my $ibr = $i_begin_line - 1;
    if (   $ibr > 0
        && $types_to_go[$ibr] eq 'b' )
    {
        $ibr--;
    }
    if ( $ibr >= 0 ) {
        my $i_nonblank = $self->set_forced_breakpoint($ibr);

        # Crude patch to prevent sub recombine_breakpoints from undoing
        # this break, especially after an '='.  It will leave old
        # breakpoints alone. See c098/x045 for some examples.
        if ( defined($i_nonblank) ) {
            $old_breakpoint_to_go[$i_nonblank] = 1;
        }
    }
    return;
} ## end sub set_forced_lp_break

sub reduce_lp_indentation {

    # reduce the leading whitespace at token $i if possible by $spaces_needed
    # (a large value of $spaces_needed will remove all excess space)
    # NOTE: to be called from break_lists only for a sequence of tokens
    # contained between opening and closing parens/braces/brackets

    my ( $self, $i, $spaces_wanted ) = @_;
    my $deleted_spaces = 0;

    my $item             = $leading_spaces_to_go[$i];
    my $available_spaces = $item->get_available_spaces();

    if (
        $available_spaces > 0
        && ( ( $spaces_wanted <= $available_spaces )
            || !$item->get_have_child() )
      )
    {

        # we'll remove these spaces, but mark them as recoverable
        $deleted_spaces =
          $item->tentatively_decrease_available_spaces($spaces_wanted);
    }

    return $deleted_spaces;
} ## end sub reduce_lp_indentation

###########################################################
# CODE SECTION 13: Preparing batches for vertical alignment
###########################################################

sub check_convey_batch_input {

    # Check for valid input to sub convey_batch_to_vertical_aligner.  An
    # error here would most likely be due to an error in the calling
    # routine 'sub grind_batch_of_CODE'.
    my ( $self, $ri_first, $ri_last ) = @_;

    if ( !defined($ri_first) || !defined($ri_last) ) {
        Fault(<<EOM);
Undefined line ranges ri_first and/r ri_last
EOM
    }

    my $nmax       = @{$ri_first} - 1;
    my $nmax_check = @{$ri_last} - 1;
    if ( $nmax < 0 || $nmax_check < 0 || $nmax != $nmax_check ) {
        Fault(<<EOM);
Line range index error: nmax=$nmax but nmax_check=$nmax_check
These should be equal and >=0
EOM
    }
    my ( $ibeg, $iend );
    foreach my $n ( 0 .. $nmax ) {
        my $ibeg_m = $ibeg;
        my $iend_m = $iend;
        $ibeg = $ri_first->[$n];
        $iend = $ri_last->[$n];
        if ( $ibeg < 0 || $iend < $ibeg || $iend > $max_index_to_go ) {
            Fault(<<EOM);
Bad line range at line index $n of $nmax: ibeg=$ibeg, iend=$iend
These should have iend >= ibeg and be in the range (0..$max_index_to_go)
EOM
        }
        next if ( $n == 0 );
        if ( $ibeg <= $iend_m ) {
            Fault(<<EOM);
Line ranges overlap: iend=$iend_m at line $n-1 but ibeg=$ibeg for line $n
EOM
        }
    }
    return;
} ## end sub check_convey_batch_input

sub convey_batch_to_vertical_aligner {

    my ($self) = @_;

    # This routine receives a batch of code for which the final line breaks
    # have been defined. Here we prepare the lines for passing to the vertical
    # aligner.  We do the following tasks:
    # - mark certain vertical alignment tokens, such as '=', in each line
    # - make final indentation adjustments
    # - do logical padding: insert extra blank spaces to help display certain
    #   logical constructions
    # - send the line to the vertical aligner

    my $rLL               = $self->[_rLL_];
    my $Klimit            = $self->[_Klimit_];
    my $ris_list_by_seqno = $self->[_ris_list_by_seqno_];
    my $this_batch        = $self->[_this_batch_];

    my $do_not_pad              = $this_batch->[_do_not_pad_];
    my $starting_in_quote       = $this_batch->[_starting_in_quote_];
    my $ending_in_quote         = $this_batch->[_ending_in_quote_];
    my $is_static_block_comment = $this_batch->[_is_static_block_comment_];
    my $batch_CODE_type         = $this_batch->[_batch_CODE_type_];
    my $ri_first                = $this_batch->[_ri_first_];
    my $ri_last                 = $this_batch->[_ri_last_];

    $self->check_convey_batch_input( $ri_first, $ri_last ) if (DEVEL_MODE);

    my $n_last_line = @{$ri_first} - 1;

    my $ibeg_next = $ri_first->[0];
    my $iend_next = $ri_last->[0];

    my $type_beg_next  = $types_to_go[$ibeg_next];
    my $type_end_next  = $types_to_go[$iend_next];
    my $token_beg_next = $tokens_to_go[$ibeg_next];

    my $rindentation_list = [0];    # ref to indentations for each line
    my ( $cscw_block_comment, $closing_side_comment, $is_block_comment );

    if ( !$max_index_to_go && $type_beg_next eq '#' ) {
        $is_block_comment = 1;
    }

    if ($rOpts_closing_side_comments) {
        ( $closing_side_comment, $cscw_block_comment ) =
          $self->add_closing_side_comment( $ri_first, $ri_last );
    }

    if ( $n_last_line > 0 || $rOpts_extended_continuation_indentation ) {
        $self->undo_ci( $ri_first, $ri_last,
            $this_batch->[_rix_seqno_controlling_ci_] );
    }

    # for multi-line batches ...
    if ( $n_last_line > 0 ) {

        # flush before a long if statement to avoid unwanted alignment
        $self->flush_vertical_aligner()
          if ( $type_beg_next eq 'k'
            && $is_if_unless{$token_beg_next} );

        $self->set_logical_padding( $ri_first, $ri_last, $starting_in_quote )
          if ($rOpts_logical_padding);

        $self->xlp_tweak( $ri_first, $ri_last )
          if ($rOpts_extended_line_up_parentheses);
    }

    if (DEVEL_MODE) { $self->check_batch_summed_lengths() }

    # ----------------------------------------------------------
    # define the vertical alignments for all lines of this batch
    # ----------------------------------------------------------
    my $rline_alignments;

    if ( !$max_index_to_go ) {

        # Optional shortcut for single token ...
        # = [ [ $rtokens, $rfields, $rpatterns, $rfield_lengths ] ];
        $rline_alignments = [
            [
                [],
                [ $tokens_to_go[0] ],
                [ $types_to_go[0] ],
                [ $summed_lengths_to_go[1] - $summed_lengths_to_go[0] ],
            ]
        ];
    }
    else {
        $rline_alignments =
          $self->make_vertical_alignments( $ri_first, $ri_last );
    }

    # ----------------------------------------------
    # loop to send each line to the vertical aligner
    # ----------------------------------------------
    my ( $type_beg, $type_end, $token_beg, $ljump );

    for my $n ( 0 .. $n_last_line ) {

        # ----------------------------------------------------------------
        # This hash will hold the args for vertical alignment of this line
        # We will populate it as we go.
        # ----------------------------------------------------------------
        my $rvao_args = {};

        my $type_beg_last = $type_beg;
        my $type_end_last = $type_end;

        my $ibeg = $ibeg_next;
        my $iend = $iend_next;
        my $Kbeg = $K_to_go[$ibeg];
        my $Kend = $K_to_go[$iend];

        $type_beg  = $type_beg_next;
        $type_end  = $type_end_next;
        $token_beg = $token_beg_next;

        # ---------------------------------------------------
        # Define the check value 'Kend' to send for this line
        # ---------------------------------------------------
        # The 'Kend' value is an integer for checking that lines come out of
        # the far end of the pipeline in the right order.  It increases
        # linearly along the token stream.  But we only send ending K values of
        # non-comments down the pipeline.  This is equivalent to checking that
        # the last CODE_type is blank or equal to 'VER'. See also sub
        # resync_lines_and_tokens for related coding.  Note that
        # '$batch_CODE_type' is the code type of the line to which the ending
        # token belongs.
        my $Kend_code =
          $batch_CODE_type && $batch_CODE_type ne 'VER' ? undef : $Kend;

        # Get some vars on line [n+1], if any,
        # and define $ljump = level jump needed by 'sub get_final_indentation'
        if ( $n < $n_last_line ) {
            $ibeg_next = $ri_first->[ $n + 1 ];
            $iend_next = $ri_last->[ $n + 1 ];

            $type_beg_next  = $types_to_go[$ibeg_next];
            $type_end_next  = $types_to_go[$iend_next];
            $token_beg_next = $tokens_to_go[$ibeg_next];

            my $Kbeg_next = $K_to_go[$ibeg_next];
            $ljump = $rLL->[$Kbeg_next]->[_LEVEL_] - $rLL->[$Kend]->[_LEVEL_];
        }
        elsif ( !$is_block_comment && $Kend < $Klimit ) {

            # Patch for git #51, a bare closing qw paren was not outdented
            # if the flag '-nodelete-old-newlines is set
            # Note that we are just looking ahead for the next nonblank
            # character. We could scan past an arbitrary number of block
            # comments or hanging side comments by calling K_next_code, but it
            # could add significant run time with very little to be gained.
            my $Kbeg_next = $Kend + 1;
            if (   $Kbeg_next < $Klimit
                && $rLL->[$Kbeg_next]->[_TYPE_] eq 'b' )
            {
                $Kbeg_next += 1;
            }
            $ljump =
              $rLL->[$Kbeg_next]->[_LEVEL_] - $rLL->[$Kend]->[_LEVEL_];
        }
        else {
            $ljump = 0;
        }

        # ---------------------------------------------
        # get the vertical alignment info for this line
        # ---------------------------------------------

        # The lines are broken into fields which can be spaced by the vertical
        # to achieve vertical alignment.  These fields are the actual text
        # which will be output, so from here on no more changes can be made to
        # the text.
        my $rline_alignment = $rline_alignments->[$n];
        my ( $rtokens, $rfields, $rpatterns, $rfield_lengths ) =
          @{$rline_alignment};

        # Programming check: (shouldn't happen)
        # The number of tokens which separate the fields must always be
        # one less than the number of fields. If this is not true then
        # an error has been introduced in sub make_alignment_patterns.
        if (DEVEL_MODE) {
            if ( @{$rfields} && ( @{$rtokens} != ( @{$rfields} - 1 ) ) ) {
                my $nt  = @{$rtokens};
                my $nf  = @{$rfields};
                my $msg = <<EOM;
Program bug in Perl::Tidy::Formatter, probably in sub 'make_alignment_patterns':
The number of tokens = $nt should be one less than number of fields: $nf
EOM
                Fault($msg);
            }
        }

        # --------------------------------------
        # get the final indentation of this line
        # --------------------------------------
        my (

            $indentation,
            $lev,
            $level_end,
            $i_terminal,
            $is_outdented_line,

        ) = $self->get_final_indentation(

            $ibeg,
            $iend,
            $rfields,
            $rpatterns,
            $ri_first,
            $ri_last,
            $rindentation_list,
            $ljump,
            $starting_in_quote,
            $is_static_block_comment,

        );

        # --------------------------------
        # define flag 'outdent_long_lines'
        # --------------------------------
        if (
            # we will allow outdenting of long lines..
            # which are long quotes, if allowed
            ( $type_beg eq 'Q' && $rOpts_outdent_long_quotes )

            # which are long block comments, if allowed
            || (
                   $type_beg eq '#'
                && $rOpts_outdent_long_comments

                # but not if this is a static block comment
                && !$is_static_block_comment
            )
          )
        {
            $rvao_args->{outdent_long_lines} = 1;

            # convert -lp indentation objects to spaces to allow outdenting
            if ( ref($indentation) ) {
                $indentation = $indentation->get_spaces();
            }
        }

        # --------------------------------------------------
        # define flags 'break_alignment_before' and '_after'
        # --------------------------------------------------

        # These flags tell the vertical aligner to stop alignment before or
        # after this line.
        if ($is_outdented_line) {
            $rvao_args->{break_alignment_before} = 1;
            $rvao_args->{break_alignment_after}  = 1;
        }
        elsif ($do_not_pad) {
            $rvao_args->{break_alignment_before} = 1;
        }

        # flush at an 'if' which follows a line with (1) terminal semicolon
        # or (2) terminal block_type which is not an 'if'.  This prevents
        # unwanted alignment between the lines.
        elsif ( $type_beg eq 'k' && $token_beg eq 'if' ) {
            my $type_m = 'b';
            my $block_type_m;

            if ( $Kbeg > 0 ) {
                my $Km = $Kbeg - 1;
                $type_m = $rLL->[$Km]->[_TYPE_];
                if ( $type_m eq 'b' && $Km > 0 ) {
                    $Km -= 1;
                    $type_m = $rLL->[$Km]->[_TYPE_];
                }
                if ( $type_m eq '#' && $Km > 0 ) {
                    $Km -= 1;
                    $type_m = $rLL->[$Km]->[_TYPE_];
                    if ( $type_m eq 'b' && $Km > 0 ) {
                        $Km -= 1;
                        $type_m = $rLL->[$Km]->[_TYPE_];
                    }
                }

                my $seqno_m = $rLL->[$Km]->[_TYPE_SEQUENCE_];
                if ($seqno_m) {
                    $block_type_m = $self->[_rblock_type_of_seqno_]->{$seqno_m};
                }
            }

            # break after anything that is not if-like
            if (
                $type_m eq ';'
                || (   $type_m eq '}'
                    && $block_type_m
                    && $block_type_m ne 'if'
                    && $block_type_m ne 'unless'
                    && $block_type_m ne 'elsif'
                    && $block_type_m ne 'else' )
              )
            {
                $rvao_args->{break_alignment_before} = 1;
            }
        }
        else {
            ## ok - do not need to break vertical alignment here
        }

        # ----------------------------------
        # define 'rvertical_tightness_flags'
        # ----------------------------------
        # These flags tell the vertical aligner if/when to combine consecutive
        # lines, based on the user input parameters.
        $rvao_args->{rvertical_tightness_flags} =
          $self->set_vertical_tightness_flags( $n, $n_last_line, $ibeg, $iend,
            $ri_first, $ri_last, $ending_in_quote, $closing_side_comment )
          unless ( $is_block_comment
            || $self->[_no_vertical_tightness_flags_] );

        # ----------------------------------
        # define 'is_terminal_ternary'  flag
        # ----------------------------------

        # This flag is set at the final ':' of a ternary chain to request
        # vertical alignment of the final term.  Here is a slightly complex
        # example:
        #
        # $self->{_text} = (
        #    !$section        ? ''
        #   : $type eq 'item' ? "the $section entry"
        #   :                   "the section on $section"
        # )
        # . (
        #   $page
        #   ? ( $section ? ' in ' : '' ) . "the $page$page_ext manpage"
        #   : ' elsewhere in this document'
        # );
        #
        if ( $type_beg eq ':' || $n > 0 && $type_end_last eq ':' ) {

            my $is_terminal_ternary = 0;
            my $last_leading_type   = $n > 0 ? $type_beg_last : ':';
            my $terminal_type       = $types_to_go[$i_terminal];
            if (   $terminal_type ne ';'
                && $n_last_line > $n
                && $level_end == $lev )
            {
                my $Kbeg_next = $K_to_go[$ibeg_next];
                $level_end     = $rLL->[$Kbeg_next]->[_LEVEL_];
                $terminal_type = $rLL->[$Kbeg_next]->[_TYPE_];
            }
            if (
                $last_leading_type eq ':'
                && (   ( $terminal_type eq ';' && $level_end <= $lev )
                    || ( $terminal_type ne ':' && $level_end < $lev ) )
              )
            {

                # the terminal term must not contain any ternary terms, as in
                # my $ECHO = (
                #       $Is_MSWin32 ? ".\\echo$$"
                #     : $Is_MacOS   ? ":echo$$"
                #     : ( $Is_NetWare ? "echo$$" : "./echo$$" )
                # );
                $is_terminal_ternary = 1;

                my $KP = $rLL->[$Kbeg]->[_KNEXT_SEQ_ITEM_];
                while ( defined($KP) && $KP <= $Kend ) {
                    my $type_KP = $rLL->[$KP]->[_TYPE_];
                    if ( $type_KP eq '?' || $type_KP eq ':' ) {
                        $is_terminal_ternary = 0;
                        last;
                    }
                    $KP = $rLL->[$KP]->[_KNEXT_SEQ_ITEM_];
                }
            }
            $rvao_args->{is_terminal_ternary} = $is_terminal_ternary;
        }

        # -------------------------------------------------
        # add any new closing side comment to the last line
        # -------------------------------------------------
        if ( $closing_side_comment && $n == $n_last_line && @{$rfields} ) {

            $rfields->[-1] .= " $closing_side_comment";

            # NOTE: Patch for csc. We can just use 1 for the length of the csc
            # because its length should not be a limiting factor from here on.
            $rfield_lengths->[-1] += 2;

            # repack
            $rline_alignment =
              [ $rtokens, $rfields, $rpatterns, $rfield_lengths ];
        }

        # ------------------------
        # define flag 'list_seqno'
        # ------------------------

        # This flag indicates if this line is contained in a multi-line list
        if ( !$is_block_comment ) {
            my $parent_seqno = $parent_seqno_to_go[$ibeg];
            $rvao_args->{list_seqno} = $ris_list_by_seqno->{$parent_seqno};
        }

        # The alignment tokens have been marked with nesting_depths, so we need
        # to pass nesting depths to the vertical aligner. They remain invariant
        # under all formatting operations.  Previously, level values were sent
        # to the aligner.  But they can be altered in welding and other
        # operations, and this can lead to alignment errors.
        my $nesting_depth_beg = $nesting_depth_to_go[$ibeg];
        my $nesting_depth_end = $nesting_depth_to_go[$iend];

        # A quirk in the definition of nesting depths is that the closing token
        # has the same depth as internal tokens.  The vertical aligner is
        # programmed to expect them to have the lower depth, so we fix this.
        if ( $is_closing_type{ $types_to_go[$ibeg] } ) { $nesting_depth_beg-- }
        if ( $is_closing_type{ $types_to_go[$iend] } ) { $nesting_depth_end-- }

        # Adjust nesting depths to keep -lp indentation for qw lists.  This is
        # required because qw lists contained in brackets do not get nesting
        # depths, but the vertical aligner is watching nesting depth changes to
        # decide if a -lp block is intact.  Without this patch, qw lists
        # enclosed in angle brackets will not get the correct -lp indentation.

        # Looking for line with isolated qw ...
        if (   $rOpts_line_up_parentheses
            && $type_beg eq 'q'
            && $ibeg == $iend )
        {

            # ... which is part of a multiline qw
            my $Km = $self->K_previous_nonblank($Kbeg);
            my $Kp = $self->K_next_nonblank($Kbeg);
            if (   defined($Km) && $rLL->[$Km]->[_TYPE_] eq 'q'
                || defined($Kp) && $rLL->[$Kp]->[_TYPE_] eq 'q' )
            {
                $nesting_depth_beg++;
                $nesting_depth_end++;
            }
        }

        # ---------------------------------
        # define flag 'forget_side_comment'
        # ---------------------------------

        # This flag tells the vertical aligner to reset the side comment
        # location if we are entering a new block from level 0.  This is
        # intended to keep side comments from drifting too far to the right.
        if (   $block_type_to_go[$i_terminal]
            && $nesting_depth_end > $nesting_depth_beg )
        {
            $rvao_args->{forget_side_comment} =
              !$self->[_radjusted_levels_]->[$Kbeg];
        }

        # -----------------------------------
        # Store the remaining non-flag values
        # -----------------------------------
        $rvao_args->{Kend}            = $Kend_code;
        $rvao_args->{ci_level}        = $ci_levels_to_go[$ibeg];
        $rvao_args->{indentation}     = $indentation;
        $rvao_args->{level_end}       = $nesting_depth_end;
        $rvao_args->{level}           = $nesting_depth_beg;
        $rvao_args->{rline_alignment} = $rline_alignment;
        $rvao_args->{maximum_line_length} =
          $maximum_line_length_at_level[ $levels_to_go[$ibeg] ];

        # --------------------------------------
        # send this line to the vertical aligner
        # --------------------------------------
        my $vao = $self->[_vertical_aligner_object_];
        $vao->valign_input($rvao_args);

        $do_not_pad = 0;

    } ## end of loop to output each line

    # Set flag indicating if the last line ends in an opening
    # token and is very short, so that a blank line is not
    # needed if the subsequent line is a comment.
    # Examples of what we are looking for:
    #   {
    #   && (
    #   BEGIN {
    #   default {
    #   sub {
    $self->[_last_output_short_opening_token_]

      # line ends in opening token
      #              /^[\{\(\[L]$/
      = $is_opening_type{$type_end}

      # and either
      && (
        # line has either single opening token
        $iend_next == $ibeg_next

        # or is a single token followed by opening token.
        # Note that sub identifiers have blanks like 'sub doit'
        #                                 $token_beg !~ /\s+/
        || ( $iend_next - $ibeg_next <= 2 && index( $token_beg, SPACE ) < 0 )
      )

      # and limit total to 10 character widths
      && token_sequence_length( $ibeg_next, $iend_next ) <= 10;

    # remember indentation of lines containing opening containers for
    # later use by sub get_final_indentation
    $self->save_opening_indentation( $ri_first, $ri_last,
        $rindentation_list, $this_batch->[_runmatched_opening_indexes_] )
      if ( $this_batch->[_runmatched_opening_indexes_]
        || $types_to_go[$max_index_to_go] eq 'q' );

    # output any new -cscw block comment
    if ($cscw_block_comment) {
        $self->flush_vertical_aligner();
        my $file_writer_object = $self->[_file_writer_object_];
        $file_writer_object->write_code_line( $cscw_block_comment . "\n" );
    }
    return;
} ## end sub convey_batch_to_vertical_aligner

sub check_batch_summed_lengths {

    my ( $self, $msg ) = @_;
    $msg = EMPTY_STRING unless defined($msg);
    my $rLL = $self->[_rLL_];

    # Verify that the summed lengths are correct. We want to be sure that
    # errors have not been introduced by programming changes.  Summed lengths
    # are defined in sub store_token.  Operations like padding and unmasking
    # semicolons can change token lengths, but those operations are expected to
    # update the summed lengths when they make changes.  So the summed lengths
    # should always be correct.
    foreach my $i ( 0 .. $max_index_to_go ) {
        my $len_by_sum =
          $summed_lengths_to_go[ $i + 1 ] - $summed_lengths_to_go[$i];
        my $len_tok_i = $token_lengths_to_go[$i];
        my $KK        = $K_to_go[$i];
        my $len_tok_K;

        # For --indent-only, there is not always agreement between
        # token lengths in _rLL_ and token_lengths_to_go, so skip that check.
        if ( defined($KK) && !$rOpts_indent_only ) {
            $len_tok_K = $rLL->[$KK]->[_TOKEN_LENGTH_];
        }
        if ( $len_by_sum != $len_tok_i
            || defined($len_tok_K) && $len_by_sum != $len_tok_K )
        {
            my $lno = defined($KK) ? $rLL->[$KK]->[_LINE_INDEX_] + 1 : "undef";
            $KK = 'undef' unless defined($KK);
            my $tok  = $tokens_to_go[$i];
            my $type = $types_to_go[$i];
            Fault(<<EOM);
Summed lengths are appear to be incorrect.  $msg
lengths disagree: token length by sum=$len_by_sum but token_length_to_go[$i] = $len_tok_i and rLL->[$KK]->[_TOKEN_LENGTH_]=$len_tok_K
near line $lno starting with '$tokens_to_go[0]..' at token i=$i K=$KK token_type='$type' token='$tok'
EOM
        }
    }
    return;
} ## end sub check_batch_summed_lengths

{    ## begin closure set_vertical_alignment_markers
    my %is_vertical_alignment_type;
    my %is_not_vertical_alignment_token;
    my %is_vertical_alignment_keyword;
    my %is_terminal_alignment_type;
    my %is_low_level_alignment_token;

    BEGIN {

        my @q;

        # Replaced =~ and // in the list.  // had been removed in RT 119588
        @q = qw#
          = **= += *= &= <<= &&= -= /= |= >>= ||= //= .= %= ^= x=
          { ? : => && || ~~ !~~ =~ !~ // <=> ->
          #;
        @is_vertical_alignment_type{@q} = (1) x scalar(@q);

        # These 'tokens' are not aligned. We need this to remove [
        # from the above list because it has type ='{'
        @q = qw([);
        @is_not_vertical_alignment_token{@q} = (1) x scalar(@q);

        # these are the only types aligned at a line end
        @q = qw(&& || =>);
        @is_terminal_alignment_type{@q} = (1) x scalar(@q);

        # these tokens only align at line level
        @q = ( '{', '(' );
        @is_low_level_alignment_token{@q} = (1) x scalar(@q);

        # eq and ne were removed from this list to improve alignment chances
        @q = qw(if unless and or err for foreach while until);
        @is_vertical_alignment_keyword{@q} = (1) x scalar(@q);
    } ## end BEGIN

    my $ralignment_type_to_go;
    my $ralignment_counts;
    my $ralignment_hash_by_line;

    sub set_vertical_alignment_markers {

        my ( $self, $ri_first, $ri_last ) = @_;

        #----------------------------------------------------------------------
        # This routine looks at output lines for certain tokens which can serve
        # as vertical alignment markers (such as an '=').
        #----------------------------------------------------------------------

        # Input parameters:
        #   $ri_first = ref to list of starting line indexes in _to_go arrays
        #   $ri_last  = ref to list of ending line indexes in _to_go arrays

        # Method: We look at each token $i in this output batch and set
        # $ralignment_type_to_go->[$i] equal to those tokens at which we would
        # accept vertical alignment.

        # Initialize closure (and return) variables:
        $ralignment_type_to_go   = [];
        $ralignment_counts       = [];
        $ralignment_hash_by_line = [];

        # NOTE: closing side comments can insert up to 2 additional tokens
        # beyond the original $max_index_to_go, so we need to check ri_last for
        # the last index.
        my $max_line = @{$ri_first} - 1;
        my $max_i    = $ri_last->[$max_line];
        if ( $max_i < $max_index_to_go ) { $max_i = $max_index_to_go }

        # -----------------------------------------------------------------
        # Shortcut:
        #    - no alignments if there is only 1 token.
        #    - and nothing to do if we aren't allowed to change whitespace.
        # -----------------------------------------------------------------
        if ( $max_i <= 0 || !$rOpts_add_whitespace ) {
            goto RETURN;
        }

        # -------------------------------
        # First handle any side comment.
        # -------------------------------
        my $i_terminal = $max_i;
        if ( $types_to_go[$max_i] eq '#' ) {

            # We know $max_i > 0 if we get here.
            $i_terminal -= 1;
            if ( $i_terminal > 0 && $types_to_go[$i_terminal] eq 'b' ) {
                $i_terminal -= 1;
            }

            my $token = $tokens_to_go[$max_i];
            my $KK    = $K_to_go[$max_i];

            # Do not align various special side comments
            my $do_not_align = (

                # it is any specially marked side comment
                ( defined($KK) && $self->[_rspecial_side_comment_type_]->{$KK} )

                  # or it is a static side comment
                  || ( $rOpts->{'static-side-comments'}
                    && $token =~ /$static_side_comment_pattern/ )

                  # or a closing side comment
                  || ( $types_to_go[$i_terminal] eq '}'
                    && $tokens_to_go[$i_terminal] eq '}'
                    && $token =~ /$closing_side_comment_prefix_pattern/ )
            );

            # - For the specific combination -vc -nvsc, we put all side comments
            #   at fixed locations. Note that we will lose hanging side comment
            #   alignments. Otherwise, hsc's can move to strange locations.
            # - For -nvc -nvsc we make all side comments vertical alignments
            #   because the vertical aligner will check for -nvsc and be able
            #   to reduce the final padding to the side comments for long lines.
            #   and keep hanging side comments aligned.
            if (   !$do_not_align
                && !$rOpts_valign_side_comments
                && $rOpts_valign_code )
            {

                $do_not_align = 1;
                my $ipad = $max_i - 1;
                if ( $types_to_go[$ipad] eq 'b' ) {
                    my $pad_spaces =
                      $rOpts->{'minimum-space-to-comment'} -
                      $token_lengths_to_go[$ipad];
                    $self->pad_token( $ipad, $pad_spaces );
                }
            }

            if ( !$do_not_align ) {
                $ralignment_type_to_go->[$max_i] = '#';
                $ralignment_hash_by_line->[$max_line]->{$max_i} = '#';
                $ralignment_counts->[$max_line]++;
            }
        }

        # ----------------------------------------------
        # Nothing more to do on this line if -nvc is set
        # ----------------------------------------------
        if ( !$rOpts_valign_code ) {
            goto RETURN;
        }

        # -------------------------------------
        # Loop over each line of this batch ...
        # -------------------------------------

        foreach my $line ( 0 .. $max_line ) {

            my $ibeg = $ri_first->[$line];
            my $iend = $ri_last->[$line];

            next if ( $iend <= $ibeg );

            # back up before any side comment
            if ( $iend > $i_terminal ) { $iend = $i_terminal }

            #----------------------------------
            # Loop over all tokens on this line
            #----------------------------------
            $self->set_vertical_alignment_markers_token_loop( $line, $ibeg,
                $iend );
        }

      RETURN:
        return ( $ralignment_type_to_go, $ralignment_counts,
            $ralignment_hash_by_line );
    } ## end sub set_vertical_alignment_markers

    sub set_vertical_alignment_markers_token_loop {
        my ( $self, $line, $ibeg, $iend ) = @_;

        # Set vertical alignment markers for the tokens on one line
        # of the current output batch. This is done by updating the
        # three closure variables:
        #   $ralignment_type_to_go
        #   $ralignment_counts
        #   $ralignment_hash_by_line

        # Input parameters:
        #   $line = index of this line in the current batch
        #   $ibeg, $iend = index range of tokens to check in the _to_go arrays

        my $level_beg = $levels_to_go[$ibeg];
        my $token_beg = $tokens_to_go[$ibeg];
        my $type_beg  = $types_to_go[$ibeg];
        my $type_beg_special_char =
          ( $type_beg eq '.' || $type_beg eq ':' || $type_beg eq '?' );

        my $last_vertical_alignment_BEFORE_index = -1;
        my $vert_last_nonblank_type              = $type_beg;
        my $vert_last_nonblank_token             = $token_beg;

        # ----------------------------------------------------------------
        # Initialization code merged from 'sub delete_needless_alignments'
        # ----------------------------------------------------------------
        my $i_good_paren  = -1;
        my $i_elsif_close = $ibeg - 1;
        my $i_elsif_open  = $iend + 1;
        my @imatch_list;
        if ( $type_beg eq 'k' ) {

            # Initialization for paren patch: mark a location of a paren we
            # should keep, such as one following something like a leading
            # 'if', 'elsif',
            $i_good_paren = $ibeg + 1;
            if ( $types_to_go[$i_good_paren] eq 'b' ) {
                $i_good_paren++;
            }

            # Initialization for 'elsif' patch: remember the paren range of
            # an elsif, and do not make alignments within them because this
            # can cause loss of padding and overall brace alignment in the
            # vertical aligner.
            if (   $token_beg eq 'elsif'
                && $i_good_paren < $iend
                && $tokens_to_go[$i_good_paren] eq '(' )
            {
                $i_elsif_open  = $i_good_paren;
                $i_elsif_close = $mate_index_to_go[$i_good_paren];
                if ( !defined($i_elsif_close) ) { $i_elsif_close = -1 }
            }
        } ## end if ( $type_beg eq 'k' )

        # --------------------------------------------
        # Loop over each token in this output line ...
        # --------------------------------------------
        foreach my $i ( $ibeg + 1 .. $iend ) {

            next if ( $types_to_go[$i] eq 'b' );

            my $type           = $types_to_go[$i];
            my $token          = $tokens_to_go[$i];
            my $alignment_type = EMPTY_STRING;

            # ----------------------------------------------
            # Check for 'paren patch' : Remove excess parens
            # ----------------------------------------------

            # Excess alignment of parens can prevent other good alignments.
            # For example, note the parens in the first two rows of the
            # following snippet.  They would normally get marked for
            # alignment and aligned as follows:

            #    my $w = $columns * $cell_w + ( $columns + 1 ) * $border;
            #    my $h = $rows * $cell_h +    ( $rows + 1 ) * $border;
            #    my $img = new Gimp::Image( $w, $h, RGB );

            # This causes unnecessary paren alignment and prevents the
            # third equals from aligning. If we remove the unwanted
            # alignments we get:

            #    my $w   = $columns * $cell_w + ( $columns + 1 ) * $border;
            #    my $h   = $rows * $cell_h + ( $rows + 1 ) * $border;
            #    my $img = new Gimp::Image( $w, $h, RGB );

            # A rule for doing this which works well is to remove alignment
            # of parens whose containers do not contain other aligning
            # tokens, with the exception that we always keep alignment of
            # the first opening paren on a line (for things like 'if' and
            # 'elsif' statements).
            if ( $token eq ')' && @imatch_list ) {

                # undo the corresponding opening paren if:
                # - it is at the top of the stack
                # - and not the first overall opening paren
                # - does not follow a leading keyword on this line
                my $imate = $mate_index_to_go[$i];
                if ( !defined($imate) ) { $imate = -1 }
                if (   $imatch_list[-1] eq $imate
                    && ( $ibeg > 1 || @imatch_list > 1 )
                    && $imate > $i_good_paren )
                {
                    if ( $ralignment_type_to_go->[$imate] ) {
                        $ralignment_type_to_go->[$imate] = EMPTY_STRING;
                        $ralignment_counts->[$line]--;
                        delete $ralignment_hash_by_line->[$line]->{$imate};
                    }
                    pop @imatch_list;
                }
            }

            # do not align tokens at lower level than start of line
            # except for side comments
            if ( $levels_to_go[$i] < $level_beg ) {
                next;
            }

            #--------------------------------------------------------
            # First see if we want to align BEFORE this token
            #--------------------------------------------------------

            # The first possible token that we can align before
            # is index 2 because: 1) it doesn't normally make sense to
            # align before the first token and 2) the second
            # token must be a blank if we are to align before
            # the third
            if ( $i < $ibeg + 2 ) { }

            # must follow a blank token
            elsif ( $types_to_go[ $i - 1 ] ne 'b' ) { }

            # otherwise, do not align two in a row to create a
            # blank field
            elsif ( $last_vertical_alignment_BEFORE_index == $i - 2 ) { }

            # align before one of these keywords
            # (within a line, since $i>1)
            elsif ( $type eq 'k' ) {

                #  /^(if|unless|and|or|eq|ne)$/
                if ( $is_vertical_alignment_keyword{$token} ) {
                    $alignment_type = $token;

                    # Align postfix 'unless' and 'if' if requested (git #116)
                    # These are the only equivalent keywords. For equivalent
                    # token types see '%operator_map'.
                    if ( $token eq 'unless' && $rOpts_valign_if_unless ) {
                        $alignment_type = 'if';
                    }
                }
            }

            # align qw in a 'use' statement (issue git #93)
            elsif ( $type eq 'q' ) {
                if ( $types_to_go[0] eq 'k' && $tokens_to_go[0] eq 'use' ) {
                    $alignment_type = $type;
                }
            }

            # align before one of these types..
            elsif ( $is_vertical_alignment_type{$type}
                && !$is_not_vertical_alignment_token{$token} )
            {
                $alignment_type = $token;

                # Do not align a terminal token.  Although it might
                # occasionally look ok to do this, this has been found to be
                # a good general rule.  The main problems are:
                # (1) that the terminal token (such as an = or :) might get
                # moved far to the right where it is hard to see because
                # nothing follows it, and
                # (2) doing so may prevent other good alignments.
                # Current exceptions are && and || and =>
                if ( $i == $iend ) {
                    $alignment_type = EMPTY_STRING
                      unless ( $is_terminal_alignment_type{$type} );
                }

                # Do not align leading ': (' or '. ('.  This would prevent
                # alignment in something like the following:
                #   $extra_space .=
                #       ( $input_line_number < 10 )  ? "  "
                #     : ( $input_line_number < 100 ) ? " "
                #     :                                "";
                # or
                #  $code =
                #      ( $case_matters ? $accessor : " lc($accessor) " )
                #    . ( $yesno        ? " eq "       : " ne " )

                # Also, do not align a ( following a leading ? so we can
                # align something like this:
                #   $converter{$_}->{ushortok} =
                #     $PDL::IO::Pic::biggrays
                #     ? ( m/GIF/          ? 0 : 1 )
                #     : ( m/GIF|RAST|IFF/ ? 0 : 1 );
                if (   $type_beg_special_char
                    && $i == $ibeg + 2
                    && $types_to_go[ $i - 1 ] eq 'b' )
                {
                    $alignment_type = EMPTY_STRING;
                }

                # Certain tokens only align at the same level as the
                # initial line level
                if (   $is_low_level_alignment_token{$token}
                    && $levels_to_go[$i] != $level_beg )
                {
                    $alignment_type = EMPTY_STRING;
                }

                if ( $token eq '(' ) {

                    # For a paren after keyword, only align if-like parens,
                    # such as:
                    #    if    ( $a ) { &a }
                    #    elsif ( $b ) { &b }
                    #          ^-------------------aligned parens
                    if ( $vert_last_nonblank_type eq 'k'
                        && !$is_if_unless_elsif{$vert_last_nonblank_token} )
                    {
                        $alignment_type = EMPTY_STRING;
                    }

                    # Do not align a spaced-function-paren if requested.
                    # Issue git #53, #73.
                    if ( !$rOpts_function_paren_vertical_alignment ) {
                        my $seqno = $type_sequence_to_go[$i];
                        $alignment_type = EMPTY_STRING
                          if ( $self->[_ris_function_call_paren_]->{$seqno} );
                    }

                    # make () align with qw in a 'use' statement (git #93)
                    if (   $tokens_to_go[0] eq 'use'
                        && $types_to_go[0] eq 'k'
                        && defined( $mate_index_to_go[$i] )
                        && $mate_index_to_go[$i] == $i + 1 )
                    {
                        $alignment_type = 'q';

                        ## Note on discussion git #101. We could make this
                        ## a separate type '()' to separate it from qw's:
                        ## $alignment_type =
                        ##  $rOpts_valign_empty_parens_with_qw ? 'q' : '()';
                    }
                }

                # be sure the alignment tokens are unique
                # This experiment didn't work well: reason not determined
                # if ($token ne $type) {$alignment_type .= $type}
            }
            else {
                ## not a special type
            }

            # NOTE: This is deactivated because it causes the previous
            # if/elsif alignment to fail
            #elsif ( $type eq '}' && $token eq '}' && $block_type_to_go[$i])
            #{ $alignment_type = $type; }

            if ($alignment_type) {
                $last_vertical_alignment_BEFORE_index = $i;
            }

            #--------------------------------------------------------
            # Next see if we want to align AFTER the previous nonblank
            #--------------------------------------------------------

            # We want to line up ',' and interior ';' tokens, with the added
            # space AFTER these tokens.  (Note: interior ';' is included
            # because it may occur in short blocks).
            else {
                if (

                    # previous token IS one of these:
                    (
                           $vert_last_nonblank_type eq ','
                        || $vert_last_nonblank_type eq ';'
                    )

                    # and it follows a blank
                    && $types_to_go[ $i - 1 ] eq 'b'

                    # and it's NOT one of these
                    && !$is_closing_token{$type}

                    # then go ahead and align
                  )

                {
                    $alignment_type = $vert_last_nonblank_type;
                }
            }

            #-----------------------
            # Set the alignment type
            #-----------------------
            if ($alignment_type) {

                # but do not align the opening brace of an anonymous sub
                if (   $token eq '{'
                    && $block_type_to_go[$i]
                    && $matches_ASUB{ $block_type_to_go[$i] } )
                {

                }

                # and do not make alignments within 'elsif' parens
                elsif ( $i > $i_elsif_open && $i < $i_elsif_close ) {

                }

                # and ignore any tokens which have leading padded spaces
                # example: perl527/lop.t
                elsif ( substr( $alignment_type, 0, 1 ) eq SPACE ) {

                }

                else {
                    $ralignment_type_to_go->[$i] = $alignment_type;
                    $ralignment_hash_by_line->[$line]->{$i} = $alignment_type;
                    $ralignment_counts->[$line]++;
                    push @imatch_list, $i;
                }
            }

            $vert_last_nonblank_type  = $type;
            $vert_last_nonblank_token = $token;
        }
        return;
    } ## end sub set_vertical_alignment_markers_token_loop

} ## end closure set_vertical_alignment_markers

sub make_vertical_alignments {
    my ( $self, $ri_first, $ri_last ) = @_;

    #----------------------------
    # Shortcut for a single token
    #----------------------------
    if ( $max_index_to_go == 0 ) {
        if ( @{$ri_first} == 1 && $ri_last->[0] == 0 ) {
            my $rtokens   = [];
            my $rfields   = [ $tokens_to_go[0] ];
            my $rpatterns = [ $types_to_go[0] ];
            my $rfield_lengths =
              [ $summed_lengths_to_go[1] - $summed_lengths_to_go[0] ];
            return [ [ $rtokens, $rfields, $rpatterns, $rfield_lengths ] ];
        }

        # Strange line packing, not fatal but should not happen
        else {

            if (DEVEL_MODE) {
                my $max_line = @{$ri_first} - 1;
                my $ibeg     = $ri_first->[0];
                my $iend     = $ri_last->[0];
                my $tok_b    = $tokens_to_go[$ibeg];
                my $tok_e    = $tokens_to_go[$iend];
                my $type_b   = $types_to_go[$ibeg];
                my $type_e   = $types_to_go[$iend];
                Fault(
"Strange..max_index=0 but nlines=$max_line ibeg=$ibeg tok=$tok_b type=$type_b iend=$iend tok=$tok_e type=$type_e; please check\n"
                );
            }
        }
    }

    #---------------------------------------------------------
    # Step 1: Define the alignment tokens for the entire batch
    #---------------------------------------------------------
    my ( $ralignment_type_to_go, $ralignment_counts, $ralignment_hash_by_line );

    # We only need to make this call if vertical alignment of code is
    # requested or if a line might have a side comment.
    if (   $rOpts_valign_code
        || $types_to_go[$max_index_to_go] eq '#' )
    {
        ( $ralignment_type_to_go, $ralignment_counts, $ralignment_hash_by_line )
          = $self->set_vertical_alignment_markers( $ri_first, $ri_last );
    }

    #----------------------------------------------
    # Step 2: Break each line into alignment fields
    #----------------------------------------------
    my $rline_alignments = [];
    my $max_line         = @{$ri_first} - 1;
    foreach my $line ( 0 .. $max_line ) {

        my $ibeg = $ri_first->[$line];
        my $iend = $ri_last->[$line];

        my $rtok_fld_pat_len = $self->make_alignment_patterns(
            $ibeg, $iend, $ralignment_type_to_go,
            $ralignment_counts->[$line],
            $ralignment_hash_by_line->[$line]
        );
        push @{$rline_alignments}, $rtok_fld_pat_len;
    }
    return $rline_alignments;
} ## end sub make_vertical_alignments

sub get_seqno {

    # get opening and closing sequence numbers of a token for the vertical
    # aligner.  Assign qw quotes a value to allow qw opening and closing tokens
    # to be treated somewhat like opening and closing tokens for stacking
    # tokens by the vertical aligner.
    my ( $self, $ii, $ending_in_quote ) = @_;

    my $rLL = $self->[_rLL_];

    my $KK    = $K_to_go[$ii];
    my $seqno = $rLL->[$KK]->[_TYPE_SEQUENCE_];

    if ( $rLL->[$KK]->[_TYPE_] eq 'q' ) {
        my $SEQ_QW = -1;
        my $token  = $rLL->[$KK]->[_TOKEN_];
        if ( $ii > 0 ) {
            $seqno = $SEQ_QW if ( $token =~ /^qw\s*[\(\{\[]/ );
        }
        else {
            if ( !$ending_in_quote ) {
                $seqno = $SEQ_QW if ( $token =~ /[\)\}\]]$/ );
            }
        }
    }
    return ($seqno);
} ## end sub get_seqno

{
    my %undo_extended_ci;

    sub initialize_undo_ci {
        %undo_extended_ci = ();
        return;
    }

    sub undo_ci {

        # Undo continuation indentation in certain sequences
        my ( $self, $ri_first, $ri_last, $rix_seqno_controlling_ci ) = @_;
        my ( $line_1, $line_2, $lev_last );
        my $max_line = @{$ri_first} - 1;

        my $rseqno_controlling_my_ci = $self->[_rseqno_controlling_my_ci_];

        # Prepare a list of controlling indexes for each line if required.
        # This is used for efficient processing below.  Note: this is
        # critical for speed. In the initial implementation I just looped
        # through the @$rix_seqno_controlling_ci list below. Using NYT_prof, I
        # found that this routine was causing a huge run time in large lists.
        # On a very large list test case, this new coding dropped the run time
        # of this routine from 30 seconds to 169 milliseconds.
        my @i_controlling_ci;
        if ( $rix_seqno_controlling_ci && @{$rix_seqno_controlling_ci} ) {
            my @tmp     = reverse @{$rix_seqno_controlling_ci};
            my $ix_next = pop @tmp;
            foreach my $line ( 0 .. $max_line ) {
                my $iend = $ri_last->[$line];
                while ( defined($ix_next) && $ix_next <= $iend ) {
                    push @{ $i_controlling_ci[$line] }, $ix_next;
                    $ix_next = pop @tmp;
                }
            }
        }

        # Loop over all lines of the batch ...

        # Workaround originally created for problem c007, in which the
        # combination -lp -xci could produce a "Program bug" message in unusual
        # circumstances.
        my $skip_SECTION_1;
        if (   $rOpts_line_up_parentheses
            && $rOpts_extended_continuation_indentation )
        {

            # Only set this flag if -lp is actually used here
            foreach my $line ( 0 .. $max_line ) {
                my $ibeg = $ri_first->[$line];
                if ( ref( $leading_spaces_to_go[$ibeg] ) ) {
                    $skip_SECTION_1 = 1;
                    last;
                }
            }
        }

        foreach my $line ( 0 .. $max_line ) {

            my $ibeg = $ri_first->[$line];
            my $iend = $ri_last->[$line];
            my $lev  = $levels_to_go[$ibeg];

            #-----------------------------------
            # SECTION 1: Undo needless common CI
            #-----------------------------------

            # We are looking at leading tokens and looking for a sequence all
            # at the same level and all at a higher level than enclosing lines.

            # For example, we can undo continuation indentation in sort/map/grep
            # chains

            #    my $dat1 = pack( "n*",
            #        map { $_, $lookup->{$_} }
            #          sort { $a <=> $b }
            #          grep { $lookup->{$_} ne $default } keys %$lookup );

            # to become

            #    my $dat1 = pack( "n*",
            #        map { $_, $lookup->{$_} }
            #        sort { $a <=> $b }
            #        grep { $lookup->{$_} ne $default } keys %$lookup );

            if ( $line > 0 && !$skip_SECTION_1 ) {

                # if we have started a chain..
                if ($line_1) {

                    # see if it continues..
                    if ( $lev == $lev_last ) {
                        if (   $types_to_go[$ibeg] eq 'k'
                            && $is_sort_map_grep{ $tokens_to_go[$ibeg] } )
                        {

                            # chain continues...
                            # check for chain ending at end of a statement
                            my $is_semicolon_terminated = (
                                $line == $max_line
                                  && (
                                    $types_to_go[$iend] eq ';'

                                    # with possible side comment
                                    || (   $types_to_go[$iend] eq '#'
                                        && $iend - $ibeg >= 2
                                        && $types_to_go[ $iend - 2 ] eq ';'
                                        && $types_to_go[ $iend - 1 ] eq 'b' )
                                  )
                            );

                            $line_2 = $line
                              if ($is_semicolon_terminated);
                        }
                        else {

                            # kill chain
                            $line_1 = undef;
                        }
                    }
                    elsif ( $lev < $lev_last ) {

                        # chain ends with previous line
                        $line_2 = $line - 1;
                    }
                    else {    ## ( $lev > $lev_last )

                        # kill chain
                        $line_1 = undef;
                    }

                    # undo the continuation indentation if a chain ends
                    if ( defined($line_2) && defined($line_1) ) {
                        my $continuation_line_count = $line_2 - $line_1 + 1;
                        @ci_levels_to_go[ @{$ri_first}[ $line_1 .. $line_2 ] ]
                          = (0) x ($continuation_line_count)
                          if ( $continuation_line_count >= 0 );
                        @leading_spaces_to_go[ @{$ri_first}
                          [ $line_1 .. $line_2 ] ] =
                          @reduced_spaces_to_go[ @{$ri_first}
                          [ $line_1 .. $line_2 ] ];
                        $line_1 = undef;
                    }
                }

                # not in a chain yet..
                else {

                    # look for start of a new sort/map/grep chain
                    if ( $lev > $lev_last ) {
                        if (   $types_to_go[$ibeg] eq 'k'
                            && $is_sort_map_grep{ $tokens_to_go[$ibeg] } )
                        {
                            $line_1 = $line;
                        }
                    }
                }
            }

            #-------------------------------------
            # SECTION 2: Undo ci at cuddled blocks
            #-------------------------------------

            # Note that sub get_final_indentation will be called later to
            # actually do this, but for now we will tentatively mark cuddled
            # lines with ci=0 so that the the -xci loop which follows will be
            # correct at cuddles.
            if (
                $types_to_go[$ibeg] eq '}'
                && ( $nesting_depth_to_go[$iend] + 1 ==
                    $nesting_depth_to_go[$ibeg] )
              )
            {
                my $terminal_type = $types_to_go[$iend];
                if ( $terminal_type eq '#' && $iend > $ibeg ) {
                    $terminal_type = $types_to_go[ $iend - 1 ];
                    if ( $terminal_type eq '#' && $iend - 1 > $ibeg ) {
                        $terminal_type = $types_to_go[ $iend - 2 ];
                    }
                }

                # Patch for rt144979, part 2. Coordinated with part 1.
                # Skip cuddled braces.
                my $seqno_beg                = $type_sequence_to_go[$ibeg];
                my $is_cuddled_closing_brace = $seqno_beg
                  && $self->[_ris_cuddled_closing_brace_]->{$seqno_beg};

                if ( $terminal_type eq '{' && !$is_cuddled_closing_brace ) {
                    $ci_levels_to_go[$ibeg] = 0;
                }
            }

            #--------------------------------------------------------
            # SECTION 3: Undo ci set by sub extended_ci if not needed
            #--------------------------------------------------------

            # Undo the ci of the leading token if its controlling token
            # went out on a previous line without ci
            if ( $ci_levels_to_go[$ibeg] ) {
                my $Kbeg  = $K_to_go[$ibeg];
                my $seqno = $rseqno_controlling_my_ci->{$Kbeg};
                if ( $seqno && $undo_extended_ci{$seqno} ) {

                    # but do not undo ci set by the -lp flag
                    if ( !ref( $reduced_spaces_to_go[$ibeg] ) ) {
                        $ci_levels_to_go[$ibeg] = 0;
                        $leading_spaces_to_go[$ibeg] =
                          $reduced_spaces_to_go[$ibeg];
                    }
                }
            }

            # Flag any controlling opening tokens in lines without ci.  This
            # will be used later in the above if statement to undo the ci which
            # they added.  The array i_controlling_ci[$line] was prepared at
            # the top of this routine.
            if ( !$ci_levels_to_go[$ibeg]
                && defined( $i_controlling_ci[$line] ) )
            {
                foreach my $i ( @{ $i_controlling_ci[$line] } ) {
                    my $seqno = $type_sequence_to_go[$i];
                    $undo_extended_ci{$seqno} = 1;
                }
            }

            $lev_last = $lev;
        }

        return;
    } ## end sub undo_ci
}

{    ## begin closure set_logical_padding
    my %is_math_op;

    BEGIN {

        my @q = qw( + - * / );
        @is_math_op{@q} = (1) x scalar(@q);
    }

    sub set_logical_padding {

        # Look at a batch of lines and see if extra padding can improve the
        # alignment when there are certain leading operators. Here is an
        # example, in which some extra space is introduced before
        # '( $year' to make it line up with the subsequent lines:
        #
        #       if (   ( $Year < 1601 )
        #           || ( $Year > 2899 )
        #           || ( $EndYear < 1601 )
        #           || ( $EndYear > 2899 ) )
        #       {
        #           &Error_OutOfRange;
        #       }
        #
        my ( $self, $ri_first, $ri_last, $starting_in_quote ) = @_;
        my $max_line = @{$ri_first} - 1;

        my ( $ibeg, $ibeg_next, $ibegm, $iend, $iendm, $ipad, $pad_spaces,
            $tok_next, $type_next, $has_leading_op_next, $has_leading_op );

        # Patch to produce padding in the first line of short code blocks.
        # This is part of an update to fix cases b562 .. b983.
        # This is needed to compensate for a change which was made in 'sub
        # starting_one_line_block' to prevent blinkers.  Previously, that sub
        # would not look at the total block size and rely on sub
        # break_long_lines to break up long blocks. Consequently, the
        # first line of those batches would end in the opening block brace of a
        # sort/map/grep/eval block.  When this was changed to immediately check
        # for blocks which were too long, the opening block brace would go out
        # in a single batch, and the block contents would go out as the next
        # batch.  This caused the logic in this routine which decides if the
        # first line should be padded to be incorrect.  To fix this, we set a
        # flag if the previous batch ended in an opening sort/map/grep/eval
        # block brace, and use it to adjust the logic to compensate.

        # For example, the following would have previously been a single batch
        # but now is two batches.  We want to pad the line starting in '$dir':
        #    my (@indices) =                      # batch n-1  (prev batch n)
        #      sort {                             # batch n-1  (prev batch n)
        #            $dir eq 'left'               # batch n
        #          ? $cells[$a] <=> $cells[$b]    # batch n
        #          : $cells[$b] <=> $cells[$a];   # batch n
        #      } ( 0 .. $#cells );                # batch n

        my $rLL                  = $self->[_rLL_];
        my $rblock_type_of_seqno = $self->[_rblock_type_of_seqno_];

        my $is_short_block;
        if ( $K_to_go[0] > 0 ) {
            my $Kp = $K_to_go[0] - 1;
            if ( $Kp > 0 && $rLL->[$Kp]->[_TYPE_] eq 'b' ) {
                $Kp -= 1;
            }
            if ( $Kp > 0 && $rLL->[$Kp]->[_TYPE_] eq '#' ) {
                $Kp -= 1;
                if ( $Kp > 0 && $rLL->[$Kp]->[_TYPE_] eq 'b' ) {
                    $Kp -= 1;
                }
            }
            my $seqno = $rLL->[$Kp]->[_TYPE_SEQUENCE_];
            if ($seqno) {
                my $block_type = $rblock_type_of_seqno->{$seqno};
                if ($block_type) {
                    $is_short_block = $is_sort_map_grep_eval{$block_type};
                    $is_short_block ||= $want_one_line_block{$block_type};
                }
            }
        }

        # looking at each line of this batch..
        foreach my $line ( 0 .. $max_line - 1 ) {

            # see if the next line begins with a logical operator
            $ibeg      = $ri_first->[$line];
            $iend      = $ri_last->[$line];
            $ibeg_next = $ri_first->[ $line + 1 ];
            $tok_next  = $tokens_to_go[$ibeg_next];
            $type_next = $types_to_go[$ibeg_next];

            $has_leading_op_next = ( $tok_next =~ /^\w/ )
              ? $is_chain_operator{$tok_next}      # + - * / : ? && ||
              : $is_chain_operator{$type_next};    # and, or

            next unless ($has_leading_op_next);

            # next line must not be at lesser depth
            next
              if ( $nesting_depth_to_go[$ibeg] >
                $nesting_depth_to_go[$ibeg_next] );

            # identify the token in this line to be padded on the left
            $ipad = undef;

            # handle lines at same depth...
            if ( $nesting_depth_to_go[$ibeg] ==
                $nesting_depth_to_go[$ibeg_next] )
            {

                # if this is not first line of the batch ...
                if ( $line > 0 ) {

                    # and we have leading operator..
                    next if $has_leading_op;

                    # Introduce padding if..
                    # 1. the previous line is at lesser depth, or
                    # 2. the previous line ends in an assignment
                    # 3. the previous line ends in a 'return'
                    # 4. the previous line ends in a comma
                    # Example 1: previous line at lesser depth
                    #       if (   ( $Year < 1601 )      # <- we are here but
                    #           || ( $Year > 2899 )      #  list has not yet
                    #           || ( $EndYear < 1601 )   # collapsed vertically
                    #           || ( $EndYear > 2899 ) )
                    #       {
                    #
                    # Example 2: previous line ending in assignment:
                    #    $leapyear =
                    #        $year % 4   ? 0     # <- We are here
                    #      : $year % 100 ? 1
                    #      : $year % 400 ? 0
                    #      : 1;
                    #
                    # Example 3: previous line ending in comma:
                    #    push @expr,
                    #        /test/   ? undef
                    #      : eval($_) ? 1
                    #      : eval($_) ? 1
                    #      :            0;

                    # be sure levels agree (never indent after an indented 'if')
                    next
                      if ( $levels_to_go[$ibeg] ne $levels_to_go[$ibeg_next] );

                    # allow padding on first line after a comma but only if:
                    # (1) this is line 2 and
                    # (2) there are at more than three lines and
                    # (3) lines 3 and 4 have the same leading operator
                    # These rules try to prevent padding within a long
                    # comma-separated list.
                    my $ok_comma;
                    if (   $types_to_go[$iendm] eq ','
                        && $line == 1
                        && $max_line > 2 )
                    {
                        my $ibeg_next_next = $ri_first->[ $line + 2 ];
                        my $tok_next_next  = $tokens_to_go[$ibeg_next_next];
                        $ok_comma = $tok_next_next eq $tok_next;
                    }

                    my $ok_pad = (
                             $is_assignment{ $types_to_go[$iendm] }
                          || $ok_comma
                          || ( $nesting_depth_to_go[$ibegm] <
                            $nesting_depth_to_go[$ibeg] )
                          || ( $types_to_go[$iendm] eq 'k'
                            && $tokens_to_go[$iendm] eq 'return' )
                    );
                    next if ( !$ok_pad );

                    # we will add padding before the first token
                    $ipad = $ibeg;
                }

                # for first line of the batch..
                else {

                    # WARNING: Never indent if first line is starting in a
                    # continued quote, which would change the quote.
                    next if $starting_in_quote;

                    # if this is text after closing '}'
                    # then look for an interior token to pad
                    if ( $types_to_go[$ibeg] eq '}' ) {

                    }

                    # otherwise, we might pad if it looks really good
                    elsif ($is_short_block) {
                        $ipad = $ibeg;
                    }
                    else {

                        # we might pad token $ibeg, so be sure that it
                        # is at the same depth as the next line.
                        next
                          if ( $nesting_depth_to_go[$ibeg] !=
                            $nesting_depth_to_go[$ibeg_next] );

                        # We can pad on line 1 of a statement if at least 3
                        # lines will be aligned. Otherwise, it
                        # can look very confusing.

                 # We have to be careful not to pad if there are too few
                 # lines.  The current rule is:
                 # (1) in general we require at least 3 consecutive lines
                 # with the same leading chain operator token,
                 # (2) but an exception is that we only require two lines
                 # with leading colons if there are no more lines.  For example,
                 # the first $i in the following snippet would get padding
                 # by the second rule:
                 #
                 #   $i == 1 ? ( "First", "Color" )
                 # : $i == 2 ? ( "Then",  "Rarity" )
                 # :           ( "Then",  "Name" );

                        next if ( $max_line <= 1 );

                        my $leading_token = $tokens_to_go[$ibeg_next];
                        my $tokens_differ;

                        # never indent line 1 of a '.' series because
                        # previous line is most likely at same level.
                        # TODO: we should also look at the leading_spaces
                        # of the last output line and skip if it is same
                        # as this line.
                        next if ( $leading_token eq '.' );

                        my $count = 1;
                        foreach my $l ( 2 .. 3 ) {
                            last if ( $line + $l > $max_line );
                            $count++;
                            my $ibeg_next_next = $ri_first->[ $line + $l ];
                            next
                              if ( $tokens_to_go[$ibeg_next_next] eq
                                $leading_token );
                            $tokens_differ = 1;
                            last;
                        }
                        next if ($tokens_differ);
                        next if ( $count < 3 && $leading_token ne ':' );
                        $ipad = $ibeg;
                    }
                }
            }

            # find interior token to pad if necessary
            if ( !defined($ipad) ) {

                foreach my $i ( $ibeg .. $iend - 1 ) {

                    # find any unclosed container
                    next
                      if ( !$type_sequence_to_go[$i]
                        || !defined( $mate_index_to_go[$i] )
                        || $mate_index_to_go[$i] <= $iend );

                    # find next nonblank token to pad
                    $ipad = $inext_to_go[$i];
                    last if $ipad;
                }
                last if ( !$ipad || $ipad > $iend );
            }

            # We cannot pad the first leading token of a file because
            # it could cause a bug in which the starting indentation
            # level is guessed incorrectly each time the code is run
            # though perltidy, thus causing the code to march off to
            # the right.  For example, the following snippet would have
            # this problem:

##     ov_method mycan( $package, '(""' ),       $package
##  or ov_method mycan( $package, '(0+' ),       $package
##  or ov_method mycan( $package, '(bool' ),     $package
##  or ov_method mycan( $package, '(nomethod' ), $package;

            # If this snippet is within a block this won't happen
            # unless the user just processes the snippet alone within
            # an editor.  In that case either the user will see and
            # fix the problem or it will be corrected next time the
            # entire file is processed with perltidy.
            my $this_batch      = $self->[_this_batch_];
            my $peak_batch_size = $this_batch->[_peak_batch_size_];
            next if ( $ipad == 0 && $peak_batch_size <= 1 );

            # next line must not be at greater depth
            my $iend_next = $ri_last->[ $line + 1 ];
            next
              if ( $nesting_depth_to_go[ $iend_next + 1 ] >
                $nesting_depth_to_go[$ipad] );

            # lines must be somewhat similar to be padded..
            my $inext_next = $inext_to_go[$ibeg_next];
            my $type       = $types_to_go[$ipad];

            # see if there are multiple continuation lines
            my $logical_continuation_lines = 1;
            if ( $line + 2 <= $max_line ) {
                my $leading_token  = $tokens_to_go[$ibeg_next];
                my $ibeg_next_next = $ri_first->[ $line + 2 ];
                if (   $tokens_to_go[$ibeg_next_next] eq $leading_token
                    && $nesting_depth_to_go[$ibeg_next] eq
                    $nesting_depth_to_go[$ibeg_next_next] )
                {
                    $logical_continuation_lines++;
                }
            }

            # see if leading types match
            my $types_match = $types_to_go[$inext_next] eq $type;
            my $matches_without_bang;

            # if first line has leading ! then compare the following token
            if ( !$types_match && $type eq '!' ) {
                $types_match = $matches_without_bang =
                  $types_to_go[$inext_next] eq $types_to_go[ $ipad + 1 ];
            }
            if (

                # either we have multiple continuation lines to follow
                # and we are not padding the first token
                (
                    $logical_continuation_lines > 1
                    && ( $ipad > 0 || $is_short_block )
                )

                # or..
                || (

                    # types must match
                    $types_match

                    # and keywords must match if keyword
                    && !(
                           $type eq 'k'
                        && $tokens_to_go[$ipad] ne $tokens_to_go[$inext_next]
                    )
                )
              )
            {

                #----------------------begin special checks--------------
                #
                # SPECIAL CHECK 1:
                # A check is needed before we can make the pad.
                # If we are in a list with some long items, we want each
                # item to stand out.  So in the following example, the
                # first line beginning with '$casefold->' would look good
                # padded to align with the next line, but then it
                # would be indented more than the last line, so we
                # won't do it.
                #
                #  ok(
                #      $casefold->{code}         eq '0041'
                #        && $casefold->{status}  eq 'C'
                #        && $casefold->{mapping} eq '0061',
                #      'casefold 0x41'
                #  );
                #
                # Note:
                # It would be faster, and almost as good, to use a comma
                # count, and not pad if comma_count > 1 and the previous
                # line did not end with a comma.
                #
                my $ok_to_pad = 1;

                my $ibg   = $ri_first->[ $line + 1 ];
                my $depth = $nesting_depth_to_go[ $ibg + 1 ];

                # just use simplified formula for leading spaces to avoid
                # needless sub calls
                my $lsp = $levels_to_go[$ibg] + $ci_levels_to_go[$ibg];

                # look at each line beyond the next ..
                my $l = $line + 1;
                foreach my $ltest ( $line + 2 .. $max_line ) {
                    $l = $ltest;
                    my $ibeg_t = $ri_first->[$l];

                    # quit looking at the end of this container
                    last
                      if ( $nesting_depth_to_go[ $ibeg_t + 1 ] < $depth )
                      || ( $nesting_depth_to_go[$ibeg_t] < $depth );

                    # cannot do the pad if a later line would be
                    # outdented more
                    if ( $levels_to_go[$ibeg_t] + $ci_levels_to_go[$ibeg_t] <
                        $lsp )
                    {
                        $ok_to_pad = 0;
                        last;
                    }
                }

                # don't pad if we end in a broken list
                if ( $l == $max_line ) {
                    my $i2 = $ri_last->[$l];
                    if ( $types_to_go[$i2] eq '#' ) {
                        my $i1 = $ri_first->[$l];
                        next if terminal_type_i( $i1, $i2 ) eq ',';
                    }
                }

                # SPECIAL CHECK 2:
                # a minus may introduce a quoted variable, and we will
                # add the pad only if this line begins with a bare word,
                # such as for the word 'Button' here:
                #    [
                #         Button      => "Print letter \"~$_\"",
                #        -command     => [ sub { print "$_[0]\n" }, $_ ],
                #        -accelerator => "Meta+$_"
                #    ];
                #
                #  On the other hand, if 'Button' is quoted, it looks best
                #  not to pad:
                #    [
                #        'Button'     => "Print letter \"~$_\"",
                #        -command     => [ sub { print "$_[0]\n" }, $_ ],
                #        -accelerator => "Meta+$_"
                #    ];
                if ( $types_to_go[$ibeg_next] eq 'm' ) {
                    $ok_to_pad = 0 if $types_to_go[$ibeg] eq 'Q';
                }

                next unless $ok_to_pad;

                #----------------------end special check---------------

                my $length_1 = total_line_length( $ibeg,      $ipad - 1 );
                my $length_2 = total_line_length( $ibeg_next, $inext_next - 1 );
                $pad_spaces = $length_2 - $length_1;

                # If the first line has a leading ! and the second does
                # not, then remove one space to try to align the next
                # leading characters, which are often the same.  For example:
                #  if (  !$ts
                #      || $ts == $self->Holder
                #      || $self->Holder->Type eq "Arena" )
                #
                # This usually helps readability, but if there are subsequent
                # ! operators things will still get messed up.  For example:
                #
                #  if (  !exists $Net::DNS::typesbyname{$qtype}
                #      && exists $Net::DNS::classesbyname{$qtype}
                #      && !exists $Net::DNS::classesbyname{$qclass}
                #      && exists $Net::DNS::typesbyname{$qclass} )
                # We can't fix that.
                if ($matches_without_bang) { $pad_spaces-- }

                # make sure this won't change if -lp is used
                my $indentation_1 = $leading_spaces_to_go[$ibeg];
                if ( ref($indentation_1)
                    && $indentation_1->get_recoverable_spaces() == 0 )
                {
                    my $indentation_2 = $leading_spaces_to_go[$ibeg_next];
                    if ( ref($indentation_2)
                        && $indentation_2->get_recoverable_spaces() != 0 )
                    {
                        $pad_spaces = 0;
                    }
                }

                # we might be able to handle a pad of -1 by removing a blank
                # token
                if ( $pad_spaces < 0 ) {

                    # Deactivated for -kpit due to conflict. This block deletes
                    # a space in an attempt to improve alignment in some cases,
                    # but it may conflict with user spacing requests.  For now
                    # it is just deactivated if the -kpit option is used.
                    if ( $pad_spaces == -1 ) {
                        if (   $ipad > $ibeg
                            && $types_to_go[ $ipad - 1 ] eq 'b'
                            && !%keyword_paren_inner_tightness )
                        {
                            $self->pad_token( $ipad - 1, $pad_spaces );
                        }
                    }
                    $pad_spaces = 0;
                }

                # now apply any padding for alignment
                if ( $ipad >= 0 && $pad_spaces ) {

                    my $length_t = total_line_length( $ibeg, $iend );
                    if ( $pad_spaces + $length_t <=
                        $maximum_line_length_at_level[ $levels_to_go[$ibeg] ] )
                    {
                        $self->pad_token( $ipad, $pad_spaces );
                    }
                }
            }
        }
        continue {
            $iendm          = $iend;
            $ibegm          = $ibeg;
            $has_leading_op = $has_leading_op_next;
        } ## end of loop over lines
        return;
    } ## end sub set_logical_padding
} ## end closure set_logical_padding

sub pad_token {

    # insert $pad_spaces before token number $ipad
    my ( $self, $ipad, $pad_spaces ) = @_;
    my $rLL     = $self->[_rLL_];
    my $KK      = $K_to_go[$ipad];
    my $tok     = $rLL->[$KK]->[_TOKEN_];
    my $tok_len = $rLL->[$KK]->[_TOKEN_LENGTH_];

    if ( $pad_spaces > 0 ) {
        $tok = SPACE x $pad_spaces . $tok;
        $tok_len += $pad_spaces;
    }
    elsif ( $pad_spaces == 0 ) {
        return;
    }
    elsif ( $pad_spaces == -1 && $tokens_to_go[$ipad] eq SPACE ) {
        $tok     = EMPTY_STRING;
        $tok_len = 0;
    }
    else {

        # shouldn't happen
        DEVEL_MODE
          && Fault("unexpected request for pad spaces = $pad_spaces\n");
        return;
    }

    $tok     = $rLL->[$KK]->[_TOKEN_]        = $tok;
    $tok_len = $rLL->[$KK]->[_TOKEN_LENGTH_] = $tok_len;

    $token_lengths_to_go[$ipad] += $pad_spaces;
    $tokens_to_go[$ipad] = $tok;

    foreach my $i ( $ipad .. $max_index_to_go ) {
        $summed_lengths_to_go[ $i + 1 ] += $pad_spaces;
    }
    return;
} ## end sub pad_token

sub xlp_tweak {

    # Remove one indentation space from unbroken containers marked with
    # 'K_extra_space'.  These are mostly two-line lists with short names
    # formatted with -xlp -pt=2.
    #
    # Before this fix (extra space in line 2):
    #    is($module->VERSION, $expected,
    #        "$main_module->VERSION matches $module->VERSION ($expected)");
    #
    # After this fix:
    #    is($module->VERSION, $expected,
    #       "$main_module->VERSION matches $module->VERSION ($expected)");
    #
    # Notes:
    #  - This fixes issue git #106
    #  - This must be called after 'set_logical_padding'.
    #  - This is currently only applied to -xlp. It would also work for -lp
    #    but that style is essentially frozen.

    my ( $self, $ri_first, $ri_last ) = @_;

    # Must be 2 or more lines
    return if ( @{$ri_first} <= 1 );

    # Pull indentation object from start of second line
    my $ibeg_1    = $ri_first->[1];
    my $lp_object = $leading_spaces_to_go[$ibeg_1];
    return if ( !ref($lp_object) );

    # This only applies to an indentation object with a marked token
    my $K_extra_space = $lp_object->get_K_extra_space();
    return unless ($K_extra_space);

    # Look for the marked token within the first line of this batch
    my $ibeg_0 = $ri_first->[0];
    my $iend_0 = $ri_last->[0];
    my $ii     = $ibeg_0 + $K_extra_space - $K_to_go[$ibeg_0];
    return if ( $ii <= $ibeg_0 || $ii > $iend_0 );

    # Skip padded tokens, they have already been aligned
    my $tok = $tokens_to_go[$ii];
    return if ( substr( $tok, 0, 1 ) eq SPACE );

    # Skip 'if'-like statements, this does not improve them
    return
      if ( $types_to_go[$ibeg_0] eq 'k'
        && $is_if_unless_elsif{ $tokens_to_go[$ibeg_0] } );

    # Looks okay, reduce indentation by 1 space if possible
    my $spaces = $lp_object->get_spaces();
    if ( $spaces > 0 ) {
        $lp_object->decrease_SPACES(1);
    }

    return;
} ## end sub xlp_tweak

{    ## begin closure make_alignment_patterns

    my %keyword_map;
    my %operator_map;
    my %is_w_n_C;
    my %is_my_local_our;
    my %is_kwU;
    my %is_use_like;
    my %is_binary_type;
    my %is_binary_keyword;
    my %name_map;

    BEGIN {

        # Note: %block_type_map is now global to enable the -gal=s option

        # Map certain keywords to the same 'if' class to align
        # long if/elsif sequences. [elsif.pl]. But note that this is
        # only for purposes of making the patterns, not alignment tokens.
        # The only possible equivalent alignment tokens are 'if' and 'unless',
        # and this is handled earlier under control of $rOpts_valign_if_unless
        # to avoid making this a global hash.
        %keyword_map = (
            'unless'  => 'if',
            'else'    => 'if',
            'elsif'   => 'if',
            'when'    => 'given',
            'default' => 'given',
            'case'    => 'switch',

            # treat an 'undef' similar to numbers and quotes
            'undef' => 'Q',
        );

        # Map certain operators to the same class for alignment.
        # Note that this map is for the alignment tokens, not the patterns.
        # We could have placed 'unless' => 'if' here, but since that is
        # under control of $rOpts_valign_if_unless, it is handled elsewhere.
        %operator_map = (
            '!~' => '=~',
            '+=' => '+=',
            '-=' => '+=',
            '*=' => '+=',
            '/=' => '+=',
        );

        %is_w_n_C = (
            'w' => 1,
            'n' => 1,
            'C' => 1,
        );

        # leading keywords which to skip for efficiency when making parenless
        # container names
        my @q = qw( my local our return );
        @{is_my_local_our}{@q} = (1) x scalar(@q);

        # leading keywords where we should just join one token to form
        # parenless name
        @q = qw( use );
        @{is_use_like}{@q} = (1) x scalar(@q);

        # leading token types which may be used to make a container name
        @q = qw( k w U );
        @{is_kwU}{@q} = (1) x scalar(@q);

        # token types which prevent using leading word as a container name
        @q = qw(
          x / : % . | ^ < = > || >= != *= => !~ == && |= .= -= =~ += <=
          %= ^= x= ~~ ** << /= &= // >> ~. &. |. ^.
          **= <<= >>= &&= ||= //= <=> !~~ &.= |.= ^.= <<~
        );
        push @q, ',';
        @{is_binary_type}{@q} = (1) x scalar(@q);

        # token keywords which prevent using leading word as a container name
        @q = qw(and or err eq ne cmp);
        @is_binary_keyword{@q} = (1) x scalar(@q);

        # Some common function calls whose args can be aligned.  These do not
        # give good alignments if the lengths differ significantly.
        %name_map = (
            'unlike' => 'like',
            'isnt'   => 'is',
            ##'is_deeply' => 'is',   # poor; names lengths too different
        );

    } ## end BEGIN

    sub make_alignment_patterns {

        my ( $self, $ibeg, $iend, $ralignment_type_to_go, $alignment_count,
            $ralignment_hash )
          = @_;

        #------------------------------------------------------------------
        # This sub creates arrays of vertical alignment info for one output
        # line.
        #------------------------------------------------------------------

        # Input parameters:
        #  $ibeg, $iend - index range of this line in the _to_go arrays
        #  $ralignment_type_to_go - alignment type of tokens, like '=', if any
        #  $alignment_count - number of alignment tokens in the line
        #  $ralignment_hash - this contains all of the alignments for this
        #    line.  It is not yet used but is available for future coding in
        #    case there is a need to do a preliminary scan of alignment tokens.

        # The arrays which are created contain strings that can be tested by
        # the vertical aligner to see if consecutive lines can be aligned
        # vertically.
        #
        # The four arrays are indexed on the vertical
        # alignment fields and are:
        # @tokens - a list of any vertical alignment tokens for this line.
        #   These are tokens, such as '=' '&&' '#' etc which
        #   we want to might align vertically.  These are
        #   decorated with various information such as
        #   nesting depth to prevent unwanted vertical
        #   alignment matches.
        # @fields - the actual text of the line between the vertical alignment
        #   tokens.
        # @patterns - a modified list of token types, one for each alignment
        #   field.  These should normally each match before alignment is
        #   allowed, even when the alignment tokens match.
        # @field_lengths - the display width of each field

        if (DEVEL_MODE) {
            my $new_count = 0;
            if ( defined($ralignment_hash) ) {
                $new_count = keys %{$ralignment_hash};
            }
            my $old_count = $alignment_count;
            $old_count = 0 unless ($old_count);
            if ( $new_count != $old_count ) {
                my $K   = $K_to_go[$ibeg];
                my $rLL = $self->[_rLL_];
                my $lnl = $rLL->[$K]->[_LINE_INDEX_];
                Fault(
"alignment hash token count gives count=$new_count but old count is $old_count near line=$lnl\n"
                );
            }
        }

        # -------------------------------------
        # Shortcut for lines without alignments
        # -------------------------------------
        if ( !$alignment_count ) {
            my $rtokens = [];
            my $rfield_lengths =
              [ $summed_lengths_to_go[ $iend + 1 ] -
                  $summed_lengths_to_go[$ibeg] ];
            my $rpatterns;
            my $rfields;
            if ( $ibeg == $iend ) {
                $rfields   = [ $tokens_to_go[$ibeg] ];
                $rpatterns = [ $types_to_go[$ibeg] ];
            }
            else {
                $rfields =
                  [ join( EMPTY_STRING, @tokens_to_go[ $ibeg .. $iend ] ) ];
                $rpatterns =
                  [ join( EMPTY_STRING, @types_to_go[ $ibeg .. $iend ] ) ];
            }
            return [ $rtokens, $rfields, $rpatterns, $rfield_lengths ];
        }

        my $i_start              = $ibeg;
        my $depth                = 0;
        my $i_depth_prev         = $i_start;
        my $depth_prev           = $depth;
        my %container_name       = ( 0 => EMPTY_STRING );
        my $saw_exclamation_mark = 0;

        my @tokens        = ();
        my @fields        = ();
        my @patterns      = ();
        my @field_lengths = ();

        #-------------------------------------------------------------
        # Make a container name for any uncontained commas, issue c089
        #-------------------------------------------------------------
        # This is a generalization of the fix for rt136416 which was a
        # specialized patch just for 'use Module' statements.
        # We restrict this to semicolon-terminated statements; that way
        # we know that the top level commas are not in a list container.
        if ( $ibeg == 0 && $iend == $max_index_to_go ) {
            my $iterm = $max_index_to_go;
            if ( $types_to_go[$iterm] eq '#' ) {
                $iterm = iprev_to_go($iterm);
            }

            # Alignment lines ending like '=> sub {';  fixes issue c093
            my $term_type_ok = $types_to_go[$iterm] eq ';';
            $term_type_ok ||=
              $tokens_to_go[$iterm] eq '{' && $block_type_to_go[$iterm];

            if (   $iterm > $ibeg
                && $term_type_ok
                && !$is_my_local_our{ $tokens_to_go[$ibeg] }
                && $levels_to_go[$ibeg] eq $levels_to_go[$iterm] )
            {
                $container_name{'0'} =
                  make_uncontained_comma_name( $iterm, $ibeg, $iend );
            }
        }

        #--------------------------------
        # Begin main loop over all tokens
        #--------------------------------
        my $j = 0;    # field index

        $patterns[0] = EMPTY_STRING;
        my %token_count;
        for my $i ( $ibeg .. $iend ) {

            #-------------------------------------------------------------
            # Part 1: keep track of containers balanced on this line only.
            #-------------------------------------------------------------
            # These are used below to prevent unwanted cross-line alignments.
            # Unbalanced containers already avoid aligning across
            # container boundaries.
            my $type = $types_to_go[$i];
            if ( $type_sequence_to_go[$i] ) {
                my $token = $tokens_to_go[$i];
                if ( $is_opening_token{$token} ) {

                    # if container is balanced on this line...
                    my $i_mate = $mate_index_to_go[$i];
                    if ( !defined($i_mate) ) { $i_mate = -1 }
                    if ( $i_mate > $i && $i_mate <= $iend ) {
                        $i_depth_prev = $i;
                        $depth_prev   = $depth;
                        $depth++;

                     # Append the previous token name to make the container name
                     # more unique.  This name will also be given to any commas
                     # within this container, and it helps avoid undesirable
                     # alignments of different types of containers.

                     # Containers beginning with { and [ are given those names
                     # for uniqueness. That way commas in different containers
                     # will not match. Here is an example of what this prevents:
                     #   a => [ 1,       2, 3 ],
                     #   b => { b1 => 4, b2 => 5 },
                     # Here is another example of what we avoid by labeling the
                     # commas properly:

                   # is_d( [ $a,        $a ], [ $b,               $c ] );
                   # is_d( { foo => $a, bar => $a }, { foo => $b, bar => $c } );
                   # is_d( [ \$a,       \$a ], [ \$b,             \$c ] );

                        my $name =
                          $token eq '(' ? $self->make_paren_name($i) : $token;

                        # name cannot be '.', so change to something else if so
                        if ( $name eq '.' ) { $name = 'dot' }

                        $container_name{$depth} = "+" . $name;

                        # Make the container name even more unique if necessary.
                        # If we are not vertically aligning this opening paren,
                        # append a character count to avoid bad alignment since
                        # it usually looks bad to align commas within containers
                        # for which the opening parens do not align.  Here
                        # is an example very BAD alignment of commas (because
                        # the atan2 functions are not all aligned):
                        #    $XY =
                        #      $X * $RTYSQP1 * atan2( $X, $RTYSQP1 ) +
                        #      $Y * $RTXSQP1 * atan2( $Y, $RTXSQP1 ) -
                        #      $X * atan2( $X,            1 ) -
                        #      $Y * atan2( $Y,            1 );
                        #
                        # On the other hand, it is usually okay to align commas
                        # if opening parens align, such as:
                        #    glVertex3d( $cx + $s * $xs, $cy,            $z );
                        #    glVertex3d( $cx,            $cy + $s * $ys, $z );
                        #    glVertex3d( $cx - $s * $xs, $cy,            $z );
                        #    glVertex3d( $cx,            $cy - $s * $ys, $z );
                        #
                        # To distinguish between these situations, we append
                        # the length of the line from the previous matching
                        # token, or beginning of line, to the function name.
                        # This will allow the vertical aligner to reject
                        # undesirable matches.

                        # if we are not aligning on this paren...
                        if ( !$ralignment_type_to_go->[$i] ) {

                            # Add the length to the name ...
                            my $len = $summed_lengths_to_go[$i] -
                              $summed_lengths_to_go[$i_start];

                            # Do not include the length of any '!'. Otherwise,
                            # commas in the following line will not match:
                            #  ok( 20, tapprox( ( pdl 2,  3 ), ( pdl 2, 3 ) ) );
                            #  ok( 21, !tapprox( ( pdl 2, 3 ), ( pdl 2, 4 ) ) );
                            if ($saw_exclamation_mark) { $len -= 1 }

                            # For first token, use distance from start of line
                            # but subtract off the indentation due to level.
                            # Otherwise, results could vary with indentation.
                            if ( $i_start == $ibeg ) {
                                $len +=
                                  leading_spaces_to_go($ibeg) -
                                  $levels_to_go[$i_start] *
                                  $rOpts_indent_columns;
                            }
                            if ( $len < 0 ) { $len = 0 }

                            # tack this length onto the container name to try
                            # to make a unique token name
                            $container_name{$depth} .= "-" . $len;
                        } ## end if ( !$ralignment_type_to_go...)
                    } ## end if ( $i_mate > $i && $i_mate...)
                } ## end if ( $is_opening_token...)

                elsif ( $is_closing_token{$token} ) {
                    $i_depth_prev = $i;
                    $depth_prev   = $depth;
                    $depth-- if $depth > 0;
                }
                else {
                    ## must be ternary
                }
            } ## end if ( $type_sequence_to_go...)

            #------------------------------------------------------------
            # Part 2: if we find a new synchronization token, we are done
            # with a field
            #------------------------------------------------------------
            if ( $i > $i_start && $ralignment_type_to_go->[$i] ) {

                my $tok = my $raw_tok = $ralignment_type_to_go->[$i];

                # map similar items
                my $tok_map = $operator_map{$tok};
                $tok = $tok_map if ($tok_map);

                # make separators in different nesting depths unique
                # by appending the nesting depth digit.
                if ( $raw_tok ne '#' ) {
                    $tok .= "$nesting_depth_to_go[$i]";
                }

                # also decorate commas with any container name to avoid
                # unwanted cross-line alignments.
                if ( $raw_tok eq ',' || $raw_tok eq '=>' ) {

                  # If we are at an opening token which increased depth, we have
                  # to use the name from the previous depth.
                    my $depth_last = $i == $i_depth_prev ? $depth_prev : $depth;
                    my $depth_p =
                      ( $depth_last < $depth ? $depth_last : $depth );
                    if ( $container_name{$depth_p} ) {
                        $tok .= $container_name{$depth_p};
                    }
                }

                # Patch to avoid aligning leading and trailing if, unless.
                # Mark trailing if, unless statements with container names.
                # This makes them different from leading if, unless which
                # are not so marked at present.  If we ever need to name
                # them too, we could use ci to distinguish them.
                # Example problem to avoid:
                #    return ( 2, "DBERROR" )
                #      if ( $retval == 2 );
                #    if   ( scalar @_ ) {
                #        my ( $a, $b, $c, $d, $e, $f ) = @_;
                #    }
                if ( $raw_tok eq '(' ) {
                    if (   $ci_levels_to_go[$ibeg]
                        && $container_name{$depth} =~ /^\+(if|unless)/ )
                    {
                        $tok .= $container_name{$depth};
                    }
                }

                # Decorate block braces with block types to avoid
                # unwanted alignments such as the following:
                # foreach ( @{$routput_array} ) { $fh->print($_) }
                # eval                          { $fh->close() };
                if ( $raw_tok eq '{' && $block_type_to_go[$i] ) {
                    my $block_type = $block_type_to_go[$i];

                    # map certain related block types to allow
                    # else blocks to align
                    $block_type = $block_type_map{$block_type}
                      if ( defined( $block_type_map{$block_type} ) );

                    # remove sub names to allow one-line sub braces to align
                    # regardless of name
                    if ( $block_type =~ /$SUB_PATTERN/ ) { $block_type = 'sub' }

                    # allow all control-type blocks to align
                    if ( $block_type =~ /^[A-Z]+$/ ) { $block_type = 'BEGIN' }

                    $tok .= $block_type;

                    # Avoid aligning opening braces across leading ci level
                    # changes by marking block type with _ci (issue c224)
                    if ( $ci_levels_to_go[$ibeg] ) { $tok .= '_1' }
                }

                # Mark multiple copies of certain tokens with the copy number
                # This will allow the aligner to decide if they are matched.
                # For now, only do this for equals. For example, the two
                # equals on the next line will be labeled '=0' and '=0.2'.
                # Later, the '=0.2' will be ignored in alignment because it
                # has no match.

                # $|          = $debug = 1 if $opt_d;
                # $full_index = 1          if $opt_i;

                if ( $raw_tok eq '=' || $raw_tok eq '=>' ) {
                    $token_count{$tok}++;
                    if ( $token_count{$tok} > 1 ) {
                        $tok .= '.' . $token_count{$tok};
                    }
                }

                # concatenate the text of the consecutive tokens to form
                # the field
                push( @fields,
                    join( EMPTY_STRING, @tokens_to_go[ $i_start .. $i - 1 ] ) );

                push @field_lengths,
                  $summed_lengths_to_go[$i] - $summed_lengths_to_go[$i_start];

                # store the alignment token for this field
                push( @tokens, $tok );

                # get ready for the next batch
                $i_start              = $i;
                $saw_exclamation_mark = 0;
                $j++;
                $patterns[$j] = EMPTY_STRING;
            } ## end if ( new synchronization token

            #-----------------------------------------------
            # Part 3: continue accumulating the next pattern
            #-----------------------------------------------

            # for keywords we have to use the actual text
            if ( $type eq 'k' ) {

                my $tok_fix = $tokens_to_go[$i];

                # but map certain keywords to a common string to allow
                # alignment.
                $tok_fix = $keyword_map{$tok_fix}
                  if ( defined( $keyword_map{$tok_fix} ) );
                $patterns[$j] .= $tok_fix;
            }

            elsif ( $type eq 'b' ) {
                $patterns[$j] .= $type;
            }

            # Mark most things before arrows as a quote to
            # get them to line up. Testfile: mixed.pl.

            # handle $type =~ /^[wnC]$/
            elsif ( $is_w_n_C{$type} ) {

                my $type_fix = $type;

                if ( $i < $iend - 1 ) {
                    my $next_type = $types_to_go[ $i + 1 ];
                    my $i_next_nonblank =
                      ( ( $next_type eq 'b' ) ? $i + 2 : $i + 1 );

                    if ( $types_to_go[$i_next_nonblank] eq '=>' ) {
                        $type_fix = 'Q';

                        # Patch to ignore leading minus before words,
                        # by changing pattern 'mQ' into just 'Q',
                        # so that we can align things like this:
                        #  Button   => "Print letter \"~$_\"",
                        #  -command => [ sub { print "$_[0]\n" }, $_ ],
                        if ( $patterns[$j] eq 'm' ) {
                            $patterns[$j] = EMPTY_STRING;
                        }
                    }
                }

                # Convert a bareword within braces into a quote for
                # matching.  This will allow alignment of expressions like
                # this:
                #    local ( $SIG{'INT'} ) = IGNORE;
                #    local ( $SIG{ALRM} )  = 'POSTMAN';
                if (   $type eq 'w'
                    && $i > $ibeg
                    && $i < $iend
                    && $types_to_go[ $i - 1 ] eq 'L'
                    && $types_to_go[ $i + 1 ] eq 'R' )
                {
                    $type_fix = 'Q';
                }

                # patch to make numbers and quotes align
                if ( $type eq 'n' ) { $type_fix = 'Q' }

                $patterns[$j] .= $type_fix;
            } ## end elsif ( $is_w_n_C{$type} )

            # ignore any ! in patterns
            elsif ( $type eq '!' ) {
                $saw_exclamation_mark = 1;
            }

            # everything else
            else {
                $patterns[$j] .= $type;

                # remove any zero-level name at first fat comma
                if ( $depth == 0 && $type eq '=>' ) {
                    $container_name{$depth} = EMPTY_STRING;
                }
            }

        } ## end for my $i ( $ibeg .. $iend)

        #---------------------------------------------------------------
        # End of main loop .. join text of tokens to make the last field
        #---------------------------------------------------------------
        push( @fields,
            join( EMPTY_STRING, @tokens_to_go[ $i_start .. $iend ] ) );
        push @field_lengths,
          $summed_lengths_to_go[ $iend + 1 ] - $summed_lengths_to_go[$i_start];

        return [ \@tokens, \@fields, \@patterns, \@field_lengths ];
    } ## end sub make_alignment_patterns

    sub make_uncontained_comma_name {
        my ( $iterm, $ibeg, $iend ) = @_;

        # Make a container name by combining all leading barewords,
        # keywords and functions.
        my $name  = EMPTY_STRING;
        my $count = 0;
        my $count_max;
        my $iname_end;
        my $ilast_blank;
        for ( $ibeg .. $iterm ) {
            my $type = $types_to_go[$_];

            if ( $type eq 'b' ) {
                $ilast_blank = $_;
                next;
            }

            my $token = $tokens_to_go[$_];

            # Give up if we find an opening paren, binary operator or
            # comma within or after the proposed container name.
            if (   $token eq '('
                || $is_binary_type{$type}
                || $type eq 'k' && $is_binary_keyword{$token} )
            {
                $name = EMPTY_STRING;
                last;
            }

            # The container name is only built of certain types:
            last if ( !$is_kwU{$type} );

            # Normally it is made of one word, but two words for 'use'
            if ( $count == 0 ) {
                if (   $type eq 'k'
                    && $is_use_like{ $tokens_to_go[$_] } )
                {
                    $count_max = 2;
                }
                else {
                    $count_max = 1;
                }
            }
            elsif ( defined($count_max) && $count >= $count_max ) {
                last;
            }
            else {
                ## continue
            }

            if ( defined( $name_map{$token} ) ) {
                $token = $name_map{$token};
            }

            $name .= SPACE . $token;
            $iname_end = $_;
            $count++;
        }

        # Require a space after the container name token(s)
        if (   $name
            && defined($ilast_blank)
            && $ilast_blank > $iname_end )
        {
            $name = substr( $name, 1 );
        }
        return $name;
    } ## end sub make_uncontained_comma_name

} ## end closure make_alignment_patterns

sub make_paren_name {
    my ( $self, $i ) = @_;

    # The token at index $i is a '('.
    # Create an alignment name for it to avoid incorrect alignments.

    # Start with the name of the previous nonblank token...
    my $name = EMPTY_STRING;
    my $im   = $i - 1;
    return EMPTY_STRING if ( $im < 0 );
    if ( $types_to_go[$im] eq 'b' ) { $im--; }
    return EMPTY_STRING if ( $im < 0 );
    $name = $tokens_to_go[$im];

    # Prepend any sub name to an isolated -> to avoid unwanted alignments
    # [test case is test8/penco.pl]
    if ( $name eq '->' ) {
        $im--;
        if ( $im >= 0 && $types_to_go[$im] ne 'b' ) {
            $name = $tokens_to_go[$im] . $name;
        }
    }

    # Finally, remove any leading arrows
    if ( substr( $name, 0, 2 ) eq '->' ) {
        $name = substr( $name, 2 );
    }
    return $name;
} ## end sub make_paren_name

{    ## begin closure get_final_indentation

    my ( $last_indentation_written, $last_unadjusted_indentation,
        $last_leading_token );

    sub initialize_get_final_indentation {
        $last_indentation_written    = 0;
        $last_unadjusted_indentation = 0;
        $last_leading_token          = EMPTY_STRING;
        return;
    } ## end sub initialize_get_final_indentation

    sub get_final_indentation {

        my (
            $self,    #

            $ibeg,
            $iend,
            $rfields,
            $rpatterns,
            $ri_first,
            $ri_last,
            $rindentation_list,
            $level_jump,
            $starting_in_quote,
            $is_static_block_comment,

        ) = @_;

        #--------------------------------------------------------------
        # This routine makes any necessary adjustments to get the final
        # indentation of a line in the Formatter.
        #--------------------------------------------------------------

        # It starts with the basic indentation which has been defined for the
        # leading token, and then takes into account any options that the user
        # has set regarding special indenting and outdenting.

        # This routine has to resolve a number of complex interacting issues,
        # including:
        # 1. The various -cti=n type flags, which contain the desired change in
        #    indentation for lines ending in commas and semicolons, should be
        #    followed,
        # 2. qw quotes require special processing and do not fit perfectly
        #    with normal containers,
        # 3. formatting with -wn can complicate things, especially with qw
        #    quotes,
        # 4. formatting with the -lp option is complicated, and does not
        #    work well with qw quotes and with -wn formatting.
        # 5. a number of special situations, such as 'cuddled' formatting.
        # 6. This routine is mainly concerned with outdenting closing tokens
        #    but note that there is some overlap with the functions of sub
        #    undo_ci, which was processed earlier, so care has to be taken to
        #    keep them coordinated.

        # Find the last code token of this line
        my $i_terminal    = $iend;
        my $terminal_type = $types_to_go[$iend];
        if ( $terminal_type eq '#' && $i_terminal > $ibeg ) {
            $i_terminal -= 1;
            $terminal_type = $types_to_go[$i_terminal];
            if ( $terminal_type eq 'b' && $i_terminal > $ibeg ) {
                $i_terminal -= 1;
                $terminal_type = $types_to_go[$i_terminal];
            }
        }

        my $is_outdented_line;

        my $type_beg            = $types_to_go[$ibeg];
        my $token_beg           = $tokens_to_go[$ibeg];
        my $level_beg           = $levels_to_go[$ibeg];
        my $block_type_beg      = $block_type_to_go[$ibeg];
        my $leading_spaces_beg  = $leading_spaces_to_go[$ibeg];
        my $seqno_beg           = $type_sequence_to_go[$ibeg];
        my $is_closing_type_beg = $is_closing_type{$type_beg};

        # QW INDENTATION PATCH 3:
        my $seqno_qw_closing;
        if ( $type_beg eq 'q' && $ibeg == 0 ) {
            my $KK = $K_to_go[$ibeg];
            $seqno_qw_closing =
              $self->[_rending_multiline_qw_seqno_by_K_]->{$KK};
        }

        my $is_semicolon_terminated = $terminal_type eq ';'
          && ( $nesting_depth_to_go[$iend] < $nesting_depth_to_go[$ibeg]
            || $seqno_qw_closing );

        # NOTE: A future improvement would be to make it semicolon terminated
        # even if it does not have a semicolon but is followed by a closing
        # block brace. This would undo ci even for something like the
        # following, in which the final paren does not have a semicolon because
        # it is a possible weld location:

        # if ($BOLD_MATH) {
        #     (
        #         $labels, $comment,
        #         join( '', '<B>', &make_math( $mode, '', '', $_ ), '</B>' )
        #     )
        # }
        #

        # MOJO patch: Set a flag if this lines begins with ')->'
        my $leading_paren_arrow = (
                 $is_closing_type_beg
              && $token_beg eq ')'
              && (
                ( $ibeg < $i_terminal && $types_to_go[ $ibeg + 1 ] eq '->' )
                || (   $ibeg < $i_terminal - 1
                    && $types_to_go[ $ibeg + 1 ] eq 'b'
                    && $types_to_go[ $ibeg + 2 ] eq '->' )
              )
        );

        #---------------------------------------------------------
        # Section 1: set a flag and a default indentation
        #
        # Most lines are indented according to the initial token.
        # But it is common to outdent to the level just after the
        # terminal token in certain cases...
        # adjust_indentation flag:
        #       0 - do not adjust
        #       1 - outdent
        #       2 - vertically align with opening token
        #       3 - indent
        #---------------------------------------------------------

        my $adjust_indentation         = 0;
        my $default_adjust_indentation = 0;

        # Parameters needed for option 2, aligning with opening token:
        my (
            $opening_indentation, $opening_offset,
            $is_leading,          $opening_exists
        );

        #-------------------------------------
        # Section 1A:
        # if line starts with a sequenced item
        #-------------------------------------
        if ( $seqno_beg || $seqno_qw_closing ) {

            # This can be tedious so we let a sub do it
            (
                $adjust_indentation,
                $default_adjust_indentation,
                $opening_indentation,
                $opening_offset,
                $is_leading,
                $opening_exists,

            ) = $self->get_closing_token_indentation(

                $ibeg,
                $iend,
                $ri_first,
                $ri_last,
                $rindentation_list,
                $level_jump,
                $i_terminal,
                $is_semicolon_terminated,
                $seqno_qw_closing,

            );
        }

        #--------------------------------------------------------
        # Section 1B:
        # if at ');', '};', '>;', and '];' of a terminal qw quote
        #--------------------------------------------------------
        elsif (
               substr( $rpatterns->[0], 0, 2 ) eq 'qb'
            && substr( $rfields->[0], -1, 1 ) eq ';'
            ##         $rpatterns->[0] =~ /^qb*;$/
            && $rfields->[0] =~ /^([\)\}\]\>]);$/
          )
        {
            if ( $closing_token_indentation{$1} == 0 ) {
                $adjust_indentation = 1;
            }
            else {
                $adjust_indentation = 3;
            }
        }
        else {
            ## ok
        }

        #---------------------------------------------------------
        # Section 2: set indentation according to flag set above
        #
        # Select the indentation object to define leading
        # whitespace.  If we are outdenting something like '} } );'
        # then we want to use one level below the last token
        # ($i_terminal) in order to get it to fully outdent through
        # all levels.
        #---------------------------------------------------------
        my $indentation;
        my $lev;
        my $level_end = $levels_to_go[$iend];

        #------------------------------------
        # Section 2A: adjust_indentation == 0
        # No change in indentation
        #------------------------------------
        if ( $adjust_indentation == 0 ) {
            $indentation = $leading_spaces_beg;
            $lev         = $level_beg;
        }

        #-------------------------------------------------------------------
        # Section 2B: adjust_indentation == 1
        # Change the indentation to be that of a different token on the line
        #-------------------------------------------------------------------
        elsif ( $adjust_indentation == 1 ) {

            # Previously, the indentation of the terminal token was used:
            # OLD CODING:
            # $indentation = $reduced_spaces_to_go[$i_terminal];
            # $lev         = $levels_to_go[$i_terminal];

            # Generalization for MOJO patch:
            # Use the lowest level indentation of the tokens on the line.
            # For example, here we can use the indentation of the ending ';':
            #    } until ($selection > 0 and $selection < 10);   # ok to use ';'
            # But this will not outdent if we use the terminal indentation:
            #    )->then( sub {      # use indentation of the ->, not the {
            # Warning: reduced_spaces_to_go[] may be a reference, do not
            # do numerical checks with it

            my $i_ind = $ibeg;
            $indentation = $reduced_spaces_to_go[$i_ind];
            $lev         = $levels_to_go[$i_ind];
            while ( $i_ind < $i_terminal ) {
                $i_ind++;
                if ( $levels_to_go[$i_ind] < $lev ) {
                    $indentation = $reduced_spaces_to_go[$i_ind];
                    $lev         = $levels_to_go[$i_ind];
                }
            }
        }

        #--------------------------------------------------------------
        # Section 2C: adjust_indentation == 2
        # Handle indented closing token which aligns with opening token
        #--------------------------------------------------------------
        elsif ( $adjust_indentation == 2 ) {

            # handle option to align closing token with opening token
            $lev = $level_beg;

            # calculate spaces needed to align with opening token
            my $space_count =
              get_spaces($opening_indentation) + $opening_offset;

            # Indent less than the previous line.
            #
            # Problem: For -lp we don't exactly know what it was if there
            # were recoverable spaces sent to the aligner.  A good solution
            # would be to force a flush of the vertical alignment buffer, so
            # that we would know.  For now, this rule is used for -lp:
            #
            # When the last line did not start with a closing token we will
            # be optimistic that the aligner will recover everything wanted.
            #
            # This rule will prevent us from breaking a hierarchy of closing
            # tokens, and in a worst case will leave a closing paren too far
            # indented, but this is better than frequently leaving it not
            # indented enough.
            my $last_spaces = get_spaces($last_indentation_written);

            if ( ref($last_indentation_written)
                && !$is_closing_token{$last_leading_token} )
            {
                $last_spaces +=
                  get_recoverable_spaces($last_indentation_written);
            }

            # reset the indentation to the new space count if it works
            # only options are all or none: nothing in-between looks good
            $lev = $level_beg;

            my $diff = $last_spaces - $space_count;
            if ( $diff > 0 ) {
                $indentation = $space_count;
            }
            else {

                # We need to fix things ... but there is no good way to do it.
                # The best solution is for the user to use a longer maximum
                # line length.  We could get a smooth variation if we just move
                # the paren in using
                #    $space_count -= ( 1 - $diff );
                # But unfortunately this can give a rather unbalanced look.

                # For -xlp we currently allow a tolerance of one indentation
                # level and then revert to a simpler default.  This will jump
                # suddenly but keeps a balanced look.
                if (   $rOpts_extended_line_up_parentheses
                    && $diff >= -$rOpts_indent_columns
                    && $space_count > $leading_spaces_beg )
                {
                    $indentation = $space_count;
                }

                # Otherwise revert to defaults
                elsif ( $default_adjust_indentation == 0 ) {
                    $indentation = $leading_spaces_beg;
                }
                elsif ( $default_adjust_indentation == 1 ) {
                    $indentation = $reduced_spaces_to_go[$i_terminal];
                    $lev         = $levels_to_go[$i_terminal];
                }
                else {
                    ## ok - maybe default_adjust_indentation > 1 ?
                }
            }
        }

        #-------------------------------------------------------------
        # Section 2D: adjust_indentation == 3
        # Full indentation of closing tokens (-icb and -icp or -cti=2)
        #-------------------------------------------------------------
        else {

            # handle -icb (indented closing code block braces)
            # Updated method for indented block braces: indent one full level if
            # there is no continuation indentation.  This will occur for major
            # structures such as sub, if, else, but not for things like map
            # blocks.
            #
            # Note: only code blocks without continuation indentation are
            # handled here (if, else, unless, ..). In the following snippet,
            # the terminal brace of the sort block will have continuation
            # indentation as shown so it will not be handled by the coding
            # here.  We would have to undo the continuation indentation to do
            # this, but it probably looks ok as is.  This is a possible future
            # update for semicolon terminated lines.
            #
            #     if ($sortby eq 'date' or $sortby eq 'size') {
            #         @files = sort {
            #             $file_data{$a}{$sortby} <=> $file_data{$b}{$sortby}
            #                 or $a cmp $b
            #                 } @files;
            #         }
            #
            if (   $block_type_beg
                && $ci_levels_to_go[$i_terminal] == 0 )
            {
                my $spaces = get_spaces( $leading_spaces_to_go[$i_terminal] );
                $indentation = $spaces + $rOpts_indent_columns;

                # NOTE: for -lp we could create a new indentation object, but
                # there is probably no need to do it
            }

            # handle -icp and any -icb block braces which fall through above
            # test such as the 'sort' block mentioned above.
            else {

                # There are currently two ways to handle -icp...
                # One way is to use the indentation of the previous line:
                # $indentation = $last_indentation_written;

                # The other way is to use the indentation that the previous line
                # would have had if it hadn't been adjusted:
                $indentation = $last_unadjusted_indentation;

                # Current method: use the minimum of the two. This avoids
                # inconsistent indentation.
                if ( get_spaces($last_indentation_written) <
                    get_spaces($indentation) )
                {
                    $indentation = $last_indentation_written;
                }
            }

            # use previous indentation but use own level
            # to cause list to be flushed properly
            $lev = $level_beg;
        }

        #-------------------------------------------------------------
        # Remember indentation except for multi-line quotes, which get
        # no indentation
        #-------------------------------------------------------------
        if ( !( $ibeg == 0 && $starting_in_quote ) ) {
            $last_indentation_written    = $indentation;
            $last_unadjusted_indentation = $leading_spaces_beg;
            $last_leading_token          = $token_beg;

            # Patch to make a line which is the end of a qw quote work with the
            # -lp option.  Make $token_beg look like a closing token as some
            # type even if it is not.  This variable will become
            # $last_leading_token at the end of this loop.  Then, if the -lp
            # style is selected, and the next line is also a
            # closing token, it will not get more indentation than this line.
            # We need to do this because qw quotes (at present) only get
            # continuation indentation, not one level of indentation, so we
            # need to turn off the -lp indentation.

            # ... a picture is worth a thousand words:

            # perltidy -wn -gnu (Without this patch):
            #   ok(defined(
            #       $seqio = $gb->get_Stream_by_batch([qw(J00522 AF303112
            #       2981014)])
            #             ));

            # perltidy -wn -gnu (With this patch):
            #  ok(defined(
            #      $seqio = $gb->get_Stream_by_batch([qw(J00522 AF303112
            #      2981014)])
            #  ));
            if ( $seqno_qw_closing
                && ( length($token_beg) > 1 || $token_beg eq '>' ) )
            {
                $last_leading_token = ')';
            }
        }

        #---------------------------------------------------------------------
        # Rule: lines with leading closing tokens should not be outdented more
        # than the line which contained the corresponding opening token.
        #---------------------------------------------------------------------

        # Updated per bug report in alex_bug.pl: we must not
        # mess with the indentation of closing logical braces, so
        # we must treat something like '} else {' as if it were
        # an isolated brace
        my $is_isolated_block_brace = $block_type_beg
          && ( $i_terminal == $ibeg
            || $is_if_elsif_else_unless_while_until_for_foreach{$block_type_beg}
          );

        # only do this for a ':; which is aligned with its leading '?'
        my $is_unaligned_colon = $type_beg eq ':' && !$is_leading;

        if (
            defined($opening_indentation)
            && !$leading_paren_arrow    # MOJO patch
            && !$is_isolated_block_brace
            && !$is_unaligned_colon
          )
        {
            if ( get_spaces($opening_indentation) > get_spaces($indentation) ) {
                $indentation = $opening_indentation;
            }
        }

        #----------------------------------------------------
        # remember the indentation of each line of this batch
        #----------------------------------------------------
        push @{$rindentation_list}, $indentation;

        #---------------------------------------------
        # outdent lines with certain leading tokens...
        #---------------------------------------------
        if (

            # must be first word of this batch
            $ibeg == 0

            # and ...
            && (

                # certain leading keywords if requested
                $rOpts_outdent_keywords
                && $type_beg eq 'k'
                && $outdent_keyword{$token_beg}

                # or labels if requested
                || $rOpts_outdent_labels && $type_beg eq 'J'

                # or static block comments if requested
                || $is_static_block_comment
                && $rOpts_outdent_static_block_comments
            )
          )
        {
            my $space_count = leading_spaces_to_go($ibeg);
            if ( $space_count > 0 ) {
                $space_count -= $rOpts_continuation_indentation;
                $is_outdented_line = 1;
                if ( $space_count < 0 ) { $space_count = 0 }

                # do not promote a spaced static block comment to non-spaced;
                # this is not normally necessary but could be for some
                # unusual user inputs (such as -ci = -i)
                if ( $type_beg eq '#' && $space_count == 0 ) {
                    $space_count = 1;
                }

                $indentation = $space_count;
            }
        }

        return (

            $indentation,
            $lev,
            $level_end,
            $i_terminal,
            $is_outdented_line,

        );
    } ## end sub get_final_indentation

    sub get_closing_token_indentation {

        # Determine indentation adjustment for a line with a leading closing
        # token - i.e. one of these:     ) ] } :

        my (
            $self,    #

            $ibeg,
            $iend,
            $ri_first,
            $ri_last,
            $rindentation_list,
            $level_jump,
            $i_terminal,
            $is_semicolon_terminated,
            $seqno_qw_closing,

        ) = @_;

        my $adjust_indentation         = 0;
        my $default_adjust_indentation = $adjust_indentation;
        my $terminal_type              = $types_to_go[$i_terminal];

        my $type_beg            = $types_to_go[$ibeg];
        my $token_beg           = $tokens_to_go[$ibeg];
        my $level_beg           = $levels_to_go[$ibeg];
        my $block_type_beg      = $block_type_to_go[$ibeg];
        my $leading_spaces_beg  = $leading_spaces_to_go[$ibeg];
        my $seqno_beg           = $type_sequence_to_go[$ibeg];
        my $is_closing_type_beg = $is_closing_type{$type_beg};

        my (
            $opening_indentation, $opening_offset,
            $is_leading,          $opening_exists
        );

        # Honor any flag to reduce -ci set by the -bbxi=n option
        if ( $seqno_beg && $self->[_rwant_reduced_ci_]->{$seqno_beg} ) {

            # if this is an opening, it must be alone on the line ...
            if ( $is_closing_type{$type_beg} || $ibeg == $i_terminal ) {
                $adjust_indentation = 1;
            }

            # ... or a single welded unit (fix for b1173)
            elsif ($total_weld_count) {
                my $K_beg      = $K_to_go[$ibeg];
                my $Kterm      = $K_to_go[$i_terminal];
                my $Kterm_test = $self->[_rK_weld_left_]->{$Kterm};
                if ( defined($Kterm_test) && $Kterm_test >= $K_beg ) {
                    $Kterm = $Kterm_test;
                }
                if ( $Kterm == $K_beg ) { $adjust_indentation = 1 }
            }
            else {
                ## ok
            }
        }

        my $ris_bli_container = $self->[_ris_bli_container_];
        my $is_bli_beg = $seqno_beg ? $ris_bli_container->{$seqno_beg} : 0;

        # Update the $is_bli flag as we go. It is initially 1.
        # We note seeing a leading opening brace by setting it to 2.
        # If we get to the closing brace without seeing the opening then we
        # turn it off.  This occurs if the opening brace did not get output
        # at the start of a line, so we will then indent the closing brace
        # in the default way.
        if ( $is_bli_beg && $is_bli_beg == 1 ) {
            my $K_opening_container = $self->[_K_opening_container_];
            my $K_opening           = $K_opening_container->{$seqno_beg};
            my $K_beg               = $K_to_go[$ibeg];
            if ( $K_beg eq $K_opening ) {
                $ris_bli_container->{$seqno_beg} = $is_bli_beg = 2;
            }
            else { $is_bli_beg = 0 }
        }

        # QW PATCH for the combination -lp -wn
        # For -lp formatting use $ibeg_weld_fix to get around the problem
        # that with -lp type formatting the opening and closing tokens to not
        # have sequence numbers.
        my $ibeg_weld_fix = $ibeg;
        if ( $seqno_qw_closing && $total_weld_count ) {
            my $i_plus = $inext_to_go[$ibeg];
            if ( $i_plus <= $max_index_to_go ) {
                my $K_plus = $K_to_go[$i_plus];
                if ( defined( $self->[_rK_weld_left_]->{$K_plus} ) ) {
                    $ibeg_weld_fix = $i_plus;
                }
            }
        }

        # if we are at a closing token of some type..
        if ( $is_closing_type_beg || $seqno_qw_closing ) {

            my $K_beg = $K_to_go[$ibeg];

            # get the indentation of the line containing the corresponding
            # opening token
            (
                $opening_indentation, $opening_offset,
                $is_leading,          $opening_exists
              )
              = $self->get_opening_indentation( $ibeg_weld_fix, $ri_first,
                $ri_last, $rindentation_list, $seqno_qw_closing );

            # Patch for rt144979, part 1. Coordinated with part 2.
            # Do not undo ci for a cuddled closing brace control; it
            # needs to be treated exactly the same ci as an isolated
            # closing brace.
            my $is_cuddled_closing_brace = $seqno_beg
              && $self->[_ris_cuddled_closing_brace_]->{$seqno_beg};

            # First set the default behavior:
            if (

                # default behavior is to outdent closing lines
                # of the form:   ");  };  ];  )->xxx;"
                $is_semicolon_terminated

                # and 'cuddled parens' of the form:   ")->pack(". Bug fix for RT
                # #123749]: the TYPES here were incorrectly ')' and '('.  The
                # corrected TYPES are '}' and '{'. But skip a cuddled block.
                || (
                       $terminal_type eq '{'
                    && $type_beg eq '}'
                    && ( $nesting_depth_to_go[$iend] + 1 ==
                        $nesting_depth_to_go[$ibeg] )
                    && !$is_cuddled_closing_brace
                )

                # remove continuation indentation for any line like
                #       } ... {
                # or without ending '{' and unbalanced, such as
                #       such as '}->{$operator}'
                || (
                    $type_beg eq '}'

                    && (   $types_to_go[$iend] eq '{'
                        || $levels_to_go[$iend] < $level_beg )

                    # but not if a cuddled block
                    && !$is_cuddled_closing_brace
                )

                # and when the next line is at a lower indentation level...

                # PATCH #1: and only if the style allows undoing continuation
                # for all closing token types. We should really wait until
                # the indentation of the next line is known and then make
                # a decision, but that would require another pass.

                # PATCH #2: and not if this token is under -xci control
                || (   $level_jump < 0
                    && !$some_closing_token_indentation
                    && !$self->[_rseqno_controlling_my_ci_]->{$K_beg} )

                # Patch for -wn=2, multiple welded closing tokens
                || (   $i_terminal > $ibeg
                    && $is_closing_type{ $types_to_go[$iend] } )

                # Alternate Patch for git #51, isolated closing qw token not
                # outdented if no-delete-old-newlines is set. This works, but
                # a more general patch elsewhere fixes the real problem: ljump.
                # || ( $seqno_qw_closing && $ibeg == $i_terminal )

              )
            {
                $adjust_indentation = 1;
            }

            # outdent something like '),'
            if (
                $terminal_type eq ','

                # Removed this constraint for -wn
                # OLD: allow just one character before the comma
                # && $i_terminal == $ibeg + 1

                # require LIST environment; otherwise, we may outdent too much -
                # this can happen in calls without parentheses (overload.t);
                && $self->is_in_list_by_i($i_terminal)
              )
            {
                $adjust_indentation = 1;
            }

            # undo continuation indentation of a terminal closing token if
            # it is the last token before a level decrease.  This will allow
            # a closing token to line up with its opening counterpart, and
            # avoids an indentation jump larger than 1 level.
            my $rLL    = $self->[_rLL_];
            my $Klimit = $self->[_Klimit_];
            if (   $i_terminal == $ibeg
                && $is_closing_type_beg
                && defined($K_beg)
                && $K_beg < $Klimit )
            {
                my $K_plus    = $K_beg + 1;
                my $type_plus = $rLL->[$K_plus]->[_TYPE_];

                if ( $type_plus eq 'b' && $K_plus < $Klimit ) {
                    $type_plus = $rLL->[ ++$K_plus ]->[_TYPE_];
                }

                if ( $type_plus eq '#' && $K_plus < $Klimit ) {
                    $type_plus = $rLL->[ ++$K_plus ]->[_TYPE_];
                    if ( $type_plus eq 'b' && $K_plus < $Klimit ) {
                        $type_plus = $rLL->[ ++$K_plus ]->[_TYPE_];
                    }

                    # Note: we have skipped past just one comment (perhaps a
                    # side comment).  There could be more, and we could easily
                    # skip past all the rest with the following code, or with a
                    # while loop.  It would be rare to have to do this, and
                    # those block comments would still be indented, so it would
                    # to leave them indented.  So it seems best to just stop at
                    # a maximum of one comment.
                    ##if ($type_plus eq '#') {
                    ##   $K_plus = $self->K_next_code($K_plus);
                    ##}
                }

                if ( !$is_bli_beg && defined($K_plus) ) {
                    my $lev        = $level_beg;
                    my $level_next = $rLL->[$K_plus]->[_LEVEL_];

                    # and do not undo ci if it was set by the -xci option
                    $adjust_indentation = 1
                      if ( $level_next < $lev
                        && !$self->[_rseqno_controlling_my_ci_]->{$K_beg} );
                }

                # Patch for RT #96101, in which closing brace of anonymous subs
                # was not outdented.  We should look ahead and see if there is
                # a level decrease at the next token (i.e., a closing token),
                # but right now we do not have that information.  For now
                # we see if we are in a list, and this works well.
                # See test files 'sub*.t' for good test cases.
                if (  !$rOpts_indent_closing_brace
                    && $block_type_beg
                    && $self->[_ris_asub_block_]->{$seqno_beg}
                    && $self->is_in_list_by_i($i_terminal) )
                {
                    (
                        $opening_indentation, $opening_offset,
                        $is_leading,          $opening_exists
                      )
                      = $self->get_opening_indentation( $ibeg, $ri_first,
                        $ri_last, $rindentation_list );
                    my $indentation = $leading_spaces_beg;
                    if ( defined($opening_indentation)
                        && get_spaces($indentation) >
                        get_spaces($opening_indentation) )
                    {
                        $adjust_indentation = 1;
                    }
                }
            }

            # YVES patch 1 of 2:
            # Undo ci of line with leading closing eval brace,
            # but not beyond the indentation of the line with
            # the opening brace.
            if (   $block_type_beg
                && $block_type_beg eq 'eval'
                && !ref($leading_spaces_beg)
                && !$rOpts_indent_closing_brace )
            {
                (
                    $opening_indentation, $opening_offset,
                    $is_leading,          $opening_exists
                  )
                  = $self->get_opening_indentation( $ibeg, $ri_first, $ri_last,
                    $rindentation_list );
                my $indentation = $leading_spaces_beg;
                if ( defined($opening_indentation)
                    && get_spaces($indentation) >
                    get_spaces($opening_indentation) )
                {
                    $adjust_indentation = 1;
                }
            }

            # patch for issue git #40: -bli setting has priority
            $adjust_indentation = 0 if ($is_bli_beg);

            $default_adjust_indentation = $adjust_indentation;

            # Now modify default behavior according to user request:
            # handle option to indent non-blocks of the form );  };  ];
            # But don't do special indentation to something like ')->pack('
            if ( !$block_type_beg ) {

                # Note that logical padding has already been applied, so we may
                # need to remove some spaces to get a valid hash key.
                my $tok = $token_beg;
                my $cti = $closing_token_indentation{$tok};

                # Fix the value of 'cti' for an isolated non-welded closing qw
                # delimiter.
                if ( $seqno_qw_closing && $ibeg_weld_fix == $ibeg ) {

                    # A quote delimiter which is not a container will not have
                    # a cti value defined.  In this case use the style of a
                    # paren. For example
                    #   my @fars = (
                    #      qw<
                    #        far
                    #        farfar
                    #        farfars-far
                    #      >,
                    #   );
                    if ( !defined($cti) && length($tok) == 1 ) {

                        # something other than ')', '}', ']' ; use flag for ')'
                        $cti = $closing_token_indentation{')'};

                        # But for now, do not outdent non-container qw
                        # delimiters because it would would change existing
                        # formatting.
                        if ( $tok ne '>' ) { $cti = 3 }
                    }

                    # A non-welded closing qw cannot currently use -cti=1
                    # because that option requires a sequence number to find
                    # the opening indentation, and qw quote delimiters are not
                    # sequenced items.
                    if ( defined($cti) && $cti == 1 ) { $cti = 0 }
                }

                if ( !defined($cti) ) {

                    # $cti may not be defined for several reasons.
                    # -padding may have been applied so the character
                    #  has a length > 1
                    # - we may have welded to a closing quote token.
                    #   Here is an example (perltidy -wn):
                    #       __PACKAGE__->load_components( qw(
                    #  >         Core
                    #  >
                    #  >     ) );
                    $adjust_indentation = 0;

                }
                elsif ( $cti == 1 ) {
                    if (   $i_terminal <= $ibeg + 1
                        || $is_semicolon_terminated )
                    {
                        $adjust_indentation = 2;
                    }
                    else {
                        $adjust_indentation = 0;
                    }
                }
                elsif ( $cti == 2 ) {
                    if ($is_semicolon_terminated) {
                        $adjust_indentation = 3;
                    }
                    else {
                        $adjust_indentation = 0;
                    }
                }
                elsif ( $cti == 3 ) {
                    $adjust_indentation = 3;
                }
                else {
                    ## cti == 0
                }
            }

            # handle option to indent blocks
            else {
                if (
                    $rOpts_indent_closing_brace
                    && (
                        $i_terminal == $ibeg    #  isolated terminal '}'
                        || $is_semicolon_terminated
                    )
                  )                             #  } xxxx ;
                {
                    $adjust_indentation = 3;
                }
            }
        } ## end if ( $is_closing_type_beg || $seqno_qw_closing )

        # if line begins with a ':', align it with any
        # previous line leading with corresponding ?
        elsif ( $type_beg eq ':' ) {
            (
                $opening_indentation, $opening_offset,
                $is_leading,          $opening_exists
              )
              = $self->get_opening_indentation( $ibeg, $ri_first, $ri_last,
                $rindentation_list );
            if ($is_leading) { $adjust_indentation = 2; }
        }
        else {
            # not a closing type
        }

        return (

            $adjust_indentation,
            $default_adjust_indentation,
            $opening_indentation,
            $opening_offset,
            $is_leading,
            $opening_exists,

        );
    } ## end sub get_closing_token_indentation
} ## end closure get_final_indentation

sub get_opening_indentation {

    # get the indentation of the line which output the opening token
    # corresponding to a given closing token in the current output batch.
    #
    # given:
    # $i_closing - index in this line of a closing token ')' '}' or ']'
    #
    # $ri_first - reference to list of the first index $i for each output
    #               line in this batch
    # $ri_last - reference to list of the last index $i for each output line
    #              in this batch
    # $rindentation_list - reference to a list containing the indentation
    #            used for each line.
    # $qw_seqno - optional sequence number to use if normal seqno not defined
    #           (NOTE: would be more general to just look this up from index i)
    #
    # return:
    #   -the indentation of the line which contained the opening token
    #    which matches the token at index $i_opening
    #   -and its offset (number of columns) from the start of the line
    #
    my ( $self, $i_closing, $ri_first, $ri_last, $rindentation_list, $qw_seqno )
      = @_;

    # first, see if the opening token is in the current batch
    my $i_opening = $mate_index_to_go[$i_closing];
    my ( $indent, $offset, $is_leading, $exists );
    $exists = 1;
    if ( defined($i_opening) && $i_opening >= 0 ) {

        # it is..look up the indentation
        ( $indent, $offset, $is_leading ) =
          lookup_opening_indentation( $i_opening, $ri_first, $ri_last,
            $rindentation_list );
    }

    # if not, it should have been stored in the hash by a previous batch
    else {
        my $seqno = $type_sequence_to_go[$i_closing];
        $seqno = $qw_seqno unless ($seqno);
        ( $indent, $offset, $is_leading, $exists ) =
          get_saved_opening_indentation($seqno);
    }
    return ( $indent, $offset, $is_leading, $exists );
} ## end sub get_opening_indentation

sub examine_vertical_tightness_flags {
    my ($self) = @_;

    # For efficiency, we will set a flag to skip all calls to sub
    # 'set_vertical_tightness_flags' if vertical tightness is not possible with
    # the user input parameters.  If vertical tightness is possible, we will
    # simply leave the flag undefined and return.

    # Vertical tightness is never possible with --freeze-whitespace
    if ($rOpts_freeze_whitespace) {
        $self->[_no_vertical_tightness_flags_] = 1;
        return;
    }

    # This sub is coordinated with sub set_vertical_tightness_flags.
    # The Section numbers in the following comments are the sections
    # in sub set_vertical_tightness_flags:

    # Examine controls for Section 1a:
    return if ($rOpts_line_up_parentheses);

    foreach my $key ( keys %opening_vertical_tightness ) {
        return if ( $opening_vertical_tightness{$key} );
    }

    # Examine controls for Section 1b:
    foreach my $key ( keys %closing_vertical_tightness ) {
        return if ( $closing_vertical_tightness{$key} );
    }

    # Examine controls for Section 1c:
    foreach my $key ( keys %opening_token_right ) {
        return if ( $opening_token_right{$key} );
    }

    # Examine controls for Section 1d:
    foreach my $key ( keys %stack_opening_token ) {
        return if ( $stack_opening_token{$key} );
    }
    foreach my $key ( keys %stack_closing_token ) {
        return if ( $stack_closing_token{$key} );
    }

    # Examine controls for Section 2:
    return if ($rOpts_block_brace_vertical_tightness);

    # Examine controls for Section 3:
    return if ($rOpts_stack_closing_block_brace);

    # None of the controls used for vertical tightness are set, so
    # we can skip all calls to sub set_vertical_tightness_flags
    $self->[_no_vertical_tightness_flags_] = 1;
    return;
} ## end sub examine_vertical_tightness_flags

sub set_vertical_tightness_flags {

    my ( $self, $n, $n_last_line, $ibeg, $iend, $ri_first, $ri_last,
        $ending_in_quote, $closing_side_comment )
      = @_;

    # Define vertical tightness controls for the nth line of a batch.
    # Note: do not call this sub for a block comment or if
    # $rOpts_freeze_whitespace is set.

    # These parameters are passed to the vertical aligner to indicated
    # if we should combine this line with the next line to achieve the
    # desired vertical tightness.  This was previously an array but
    # has been converted to a hash:

    # old   hash              Meaning
    # index key
    #
    # 0   _vt_type:           1=opening non-block    2=closing non-block
    #                         3=opening block brace  4=closing block brace
    #
    # 1a  _vt_opening_flag:   1=no multiple steps, 2=multiple steps ok
    # 1b  _vt_closing_flag:   spaces of padding to use if closing
    # 2   _vt_seqno:          sequence number of container
    # 3   _vt_valid flag:     do not append if this flag is false. Will be
    #           true if appropriate -vt flag is set.  Otherwise, Will be
    #           made true only for 2 line container in parens with -lp
    # 4   _vt_seqno_beg:      sequence number of first token of line
    # 5   _vt_seqno_end:      sequence number of last token of line
    # 6   _vt_min_lines:      min number of lines for joining opening cache,
    #                           0=no constraint
    # 7   _vt_max_lines:      max number of lines for joining opening cache,
    #                           0=no constraint

    # The vertical tightness mechanism can add whitespace, so whitespace can
    # continually increase if we allowed it when the -fws flag is set.
    # See case b499 for an example.

    # Define these values...
    my $vt_type         = 0;
    my $vt_opening_flag = 0;
    my $vt_closing_flag = 0;
    my $vt_seqno        = 0;
    my $vt_valid_flag   = 0;
    my $vt_seqno_beg    = 0;
    my $vt_seqno_end    = 0;
    my $vt_min_lines    = 0;
    my $vt_max_lines    = 0;

    # Uses these global parameters:
    #   $rOpts_block_brace_tightness
    #   $rOpts_block_brace_vertical_tightness
    #   $rOpts_stack_closing_block_brace
    #   $rOpts_line_up_parentheses
    #   %opening_vertical_tightness
    #   %closing_vertical_tightness
    #   %opening_token_right
    #   %stack_closing_token
    #   %stack_opening_token

    #--------------------------------------------------------------
    # Vertical Tightness Flags Section 1:
    # Handle Lines 1 .. n-1 but not the last line
    # For non-BLOCK tokens, we will need to examine the next line
    # too, so we won't consider the last line.
    #--------------------------------------------------------------
    if ( $n < $n_last_line ) {

        #--------------------------------------------------------------
        # Vertical Tightness Flags Section 1a:
        # Look for Type 1, last token of this line is a non-block opening token
        #--------------------------------------------------------------
        my $ibeg_next = $ri_first->[ $n + 1 ];
        my $token_end = $tokens_to_go[$iend];
        my $iend_next = $ri_last->[ $n + 1 ];

        if (
               $type_sequence_to_go[$iend]
            && !$block_type_to_go[$iend]
            && $is_opening_token{$token_end}
            && (
                $opening_vertical_tightness{$token_end} > 0

                # allow 2-line method call to be closed up
                || (   $rOpts_line_up_parentheses
                    && $token_end eq '('
                    && $self->[_rlp_object_by_seqno_]
                    ->{ $type_sequence_to_go[$iend] }
                    && $iend > $ibeg
                    && $types_to_go[ $iend - 1 ] ne 'b' )
            )
          )
        {
            # avoid multiple jumps in nesting depth in one line if
            # requested
            my $ovt = $opening_vertical_tightness{$token_end};

            # Turn off the -vt flag if the next line ends in a weld.
            # This avoids an instability with one-line welds (fixes b1183).
            my $type_end_next = $types_to_go[$iend_next];
            $ovt = 0
              if ( $self->[_rK_weld_left_]->{ $K_to_go[$iend_next] }
                && $is_closing_type{$type_end_next} );

            # The flag '_rbreak_container_' avoids conflict of -bom and -pt=1
            # or -pt=2; fixes b1270. See similar patch above for $cvt.
            my $seqno = $type_sequence_to_go[$iend];
            if (   $ovt
                && $seqno
                && $self->[_rbreak_container_]->{$seqno} )
            {
                $ovt = 0;
            }

            # The flag '_rmax_vertical_tightness_' avoids welding conflicts.
            if ( defined( $self->[_rmax_vertical_tightness_]->{$seqno} ) ) {
                $ovt =
                  min( $ovt, $self->[_rmax_vertical_tightness_]->{$seqno} );
            }

            if (
                $ovt >= 2
                || ( $nesting_depth_to_go[ $iend_next + 1 ] ==
                    $nesting_depth_to_go[$ibeg_next] )
              )
            {

                # If -vt flag has not been set, mark this as invalid
                # and aligner will validate it if it sees the closing paren
                # within 2 lines.
                my $valid_flag = $ovt;

                $vt_type         = 1;
                $vt_opening_flag = $ovt;
                $vt_seqno        = $type_sequence_to_go[$iend];
                $vt_valid_flag   = $valid_flag;
            }
        }

        #--------------------------------------------------------------
        # Vertical Tightness Flags Section 1b:
        # Look for Type 2, first token of next line is a non-block closing
        # token .. and be sure this line does not have a side comment
        #--------------------------------------------------------------
        my $token_next = $tokens_to_go[$ibeg_next];
        if (   $type_sequence_to_go[$ibeg_next]
            && !$block_type_to_go[$ibeg_next]
            && $is_closing_token{$token_next}
            && $types_to_go[$iend] ne '#' )    # for safety, shouldn't happen!
        {
            my $cvt = $closing_vertical_tightness{$token_next};

            # Avoid conflict of -bom and -pvt=1 or -pvt=2, fixes b977, b1303
            # See similar patch above for $ovt.
            my $seqno = $type_sequence_to_go[$ibeg_next];
            if ( $cvt && $self->[_rbreak_container_]->{$seqno} ) {
                $cvt = 0;
            }

            # Implement cvt=3: like cvt=0 for assigned structures, like cvt=1
            # otherwise.  Added for rt136417.
            if ( $cvt == 3 ) {
                $cvt = $self->[_ris_assigned_structure_]->{$seqno} ? 0 : 1;
            }

            # The unusual combination -pvtc=2 -dws -naws can be unstable.
            # This fixes b1282, b1283.  This can be moved to set_options.
            if (   $cvt == 2
                && $rOpts_delete_old_whitespace
                && !$rOpts_add_whitespace )
            {
                $cvt = 1;
            }

            # Fix for b1379, b1380, b1381, b1382, b1384 part 2,
            # instability with adding and deleting trailing commas:
            # Reducing -cvt=2 to =1 fixes stability for -wtc=b in b1379,1380.
            # Reducing -cvt>0 to =0 fixes stability for -wtc=b in b1381,1382.
            # Reducing -cvt>0 to =0 fixes stability for -wtc=m in b1384
            if (   $cvt
                && $self->[_ris_bare_trailing_comma_by_seqno_]->{$seqno} )
            {
                $cvt = 0;
            }

            if (

                # Never append a trailing line like   ')->pack(' because it
                # will throw off later alignment.  So this line must start at a
                # deeper level than the next line (fix1 for welding, git #45).
                (
                    $nesting_depth_to_go[$ibeg_next] >=
                    $nesting_depth_to_go[ $iend_next + 1 ] + 1
                )
                && (
                    $cvt == 2
                    || (
                        !$self->is_in_list_by_i($ibeg_next)
                        && (
                            $cvt == 1

                            # allow closing up 2-line method calls
                            || (   $rOpts_line_up_parentheses
                                && $token_next eq ')'
                                && $type_sequence_to_go[$ibeg_next]
                                && $self->[_rlp_object_by_seqno_]
                                ->{ $type_sequence_to_go[$ibeg_next] } )
                        )
                    )
                )
              )
            {

                # decide which trailing closing tokens to append..
                my $ok = 0;
                if ( $cvt == 2 || $iend_next == $ibeg_next ) { $ok = 1 }
                else {
                    my $str = join( EMPTY_STRING,
                        @types_to_go[ $ibeg_next + 1 .. $ibeg_next + 2 ] );

                    # append closing token if followed by comment or ';'
                    # or another closing token (fix2 for welding, git #45)
                    if ( $str =~ /^b?[\)\]\}R#;]/ ) { $ok = 1 }
                }

                if ($ok) {
                    my $valid_flag = $cvt;
                    my $min_lines  = 0;
                    my $max_lines  = 0;

                    # Fix for b1187 and b1188: Blinking can occur if we allow
                    # welded tokens to re-form into one-line blocks during
                    # vertical alignment when -lp used.  So for this case we
                    # set the minimum number of lines to be 1 instead of 0.
                    # The maximum should be 1 if -vtc is not used.  If -vtc is
                    # used, we turn the valid
                    # flag off and set the maximum to 0. This is equivalent to
                    # using a large number.
                    my $seqno_ibeg_next = $type_sequence_to_go[$ibeg_next];
                    if (   $rOpts_line_up_parentheses
                        && $total_weld_count
                        && $seqno_ibeg_next
                        && $self->[_rlp_object_by_seqno_]->{$seqno_ibeg_next}
                        && $self->is_welded_at_seqno($seqno_ibeg_next) )
                    {
                        $min_lines  = 1;
                        $max_lines  = $cvt ? 0 : 1;
                        $valid_flag = 0;
                    }

                    $vt_type         = 2;
                    $vt_closing_flag = $tightness{$token_next} == 2 ? 0 : 1;
                    $vt_seqno        = $type_sequence_to_go[$ibeg_next];
                    $vt_valid_flag   = $valid_flag;
                    $vt_min_lines    = $min_lines;
                    $vt_max_lines    = $max_lines;
                }
            }
        }

        #--------------------------------------------------------------
        # Vertical Tightness Flags Section 1c:
        # Implement the Opening Token Right flag (Type 2)..
        # If requested, move an isolated trailing opening token to the end of
        # the previous line which ended in a comma.  We could do this
        # in sub recombine_breakpoints but that would cause problems
        # with -lp formatting.  The problem is that indentation will
        # quickly move far to the right in nested expressions.  By
        # doing it after indentation has been set, we avoid changes
        # to the indentation.  Actual movement of the token takes place
        # in sub valign_output_step_B.

        # Note added 4 May 2021: the man page suggests that the -otr flags
        # are mainly for opening tokens following commas.  But this seems
        # to have been generalized long ago to include other situations.
        # I checked the coding back to 2012 and it is essentially the same
        # as here, so it is best to leave this unchanged for now.
        #--------------------------------------------------------------
        if (
            $opening_token_right{ $tokens_to_go[$ibeg_next] }

            # previous line is not opening
            # (use -sot to combine with it)
            && !$is_opening_token{$token_end}

            # previous line ended in one of these
            # (add other cases if necessary; '=>' and '.' are not necessary
            && !$block_type_to_go[$ibeg_next]

            # this is a line with just an opening token
            && (   $iend_next == $ibeg_next
                || $iend_next == $ibeg_next + 2
                && $types_to_go[$iend_next] eq '#' )

            # Fix for case b1060 when both -baoo and -otr are set:
            # to avoid blinking, honor the -baoo flag over the -otr flag.
            && $token_end ne '||' && $token_end ne '&&'

            # Keep break after '=' if -lp. Fixes b964 b1040 b1062 b1083 b1089.
            # Generalized from '=' to $is_assignment to fix b1375.
            && !(
                   $is_assignment{ $types_to_go[$iend] }
                && $rOpts_line_up_parentheses
                && $type_sequence_to_go[$ibeg_next]
                && $self->[_rlp_object_by_seqno_]
                ->{ $type_sequence_to_go[$ibeg_next] }
            )

            # looks bad if we align vertically with the wrong container
            && $tokens_to_go[$ibeg] ne $tokens_to_go[$ibeg_next]

            # give -kba priority over -otr (b1445)
            && !$self->[_rbreak_after_Klast_]->{ $K_to_go[$iend] }
          )
        {
            my $spaces = ( $types_to_go[ $ibeg_next - 1 ] eq 'b' ) ? 1 : 0;

            $vt_type         = 2;
            $vt_closing_flag = $spaces;
            $vt_seqno        = $type_sequence_to_go[$ibeg_next];
            $vt_valid_flag   = 1;
        }

        #--------------------------------------------------------------
        # Vertical Tightness Flags Section 1d:
        # Stacking of opening and closing tokens (Type 2)
        #--------------------------------------------------------------
        my $stackable;
        my $token_beg_next = $tokens_to_go[$ibeg_next];

        # patch to make something like 'qw(' behave like an opening paren
        # (aran.t)
        if ( $types_to_go[$ibeg_next] eq 'q' ) {
            if ( $token_beg_next =~ /^qw\s*([\[\(\{])$/ ) {
                $token_beg_next = $1;
            }
        }

        if (   $is_closing_token{$token_end}
            && $is_closing_token{$token_beg_next} )
        {

            # avoid instability of combo -bom and -sct; b1179
            my $seq_next = $type_sequence_to_go[$ibeg_next];
            $stackable = $stack_closing_token{$token_beg_next}
              unless ( $block_type_to_go[$ibeg_next]
                || $seq_next && $self->[_rbreak_container_]->{$seq_next} );
        }
        elsif ($is_opening_token{$token_end}
            && $is_opening_token{$token_beg_next} )
        {
            $stackable = $stack_opening_token{$token_beg_next}
              unless ( $block_type_to_go[$ibeg_next] )
              ;    # shouldn't happen; just checking
        }
        else {
            ## not stackable
        }

        if ($stackable) {

            my $is_semicolon_terminated;
            if ( $n + 1 == $n_last_line ) {
                my ( $terminal_type, $i_terminal ) =
                  terminal_type_i( $ibeg_next, $iend_next );
                $is_semicolon_terminated = $terminal_type eq ';'
                  && $nesting_depth_to_go[$iend_next] <
                  $nesting_depth_to_go[$ibeg_next];
            }

            # this must be a line with just an opening token
            # or end in a semicolon
            if (
                $is_semicolon_terminated
                || (   $iend_next == $ibeg_next
                    || $iend_next == $ibeg_next + 2
                    && $types_to_go[$iend_next] eq '#' )
              )
            {
                my $spaces = ( $types_to_go[ $ibeg_next - 1 ] eq 'b' ) ? 1 : 0;

                $vt_type         = 2;
                $vt_closing_flag = $spaces;
                $vt_seqno        = $type_sequence_to_go[$ibeg_next];
                $vt_valid_flag   = 1;

            }
        }
    }

    #--------------------------------------------------------------
    # Vertical Tightness Flags Section 2:
    # Handle type 3, opening block braces on last line of the batch
    # Check for a last line with isolated opening BLOCK curly
    #--------------------------------------------------------------
    elsif ($rOpts_block_brace_vertical_tightness
        && $ibeg eq $iend
        && $types_to_go[$iend] eq '{'
        && $block_type_to_go[$iend]
        && $block_type_to_go[$iend] =~
        /$block_brace_vertical_tightness_pattern/ )
    {
        $vt_type         = 3;
        $vt_opening_flag = $rOpts_block_brace_vertical_tightness;
        $vt_seqno        = 0;
        $vt_valid_flag   = 1;
    }

    #--------------------------------------------------------------
    # Vertical Tightness Flags Section 3:
    # Handle type 4, a closing block brace on the last line of the batch Check
    # for a last line with isolated closing BLOCK curly
    # Patch: added a check for any new closing side comment which the
    # -csc option may generate. If it exists, there will be a side comment
    # so we cannot combine with a brace on the next line.  This issue
    # occurs for the combination -scbb and -csc is used.
    #--------------------------------------------------------------
    elsif ($rOpts_stack_closing_block_brace
        && $ibeg eq $iend
        && $block_type_to_go[$iend]
        && $types_to_go[$iend] eq '}'
        && ( !$closing_side_comment || $n < $n_last_line ) )
    {
        my $spaces = $rOpts_block_brace_tightness == 2 ? 0 : 1;

        $vt_type         = 4;
        $vt_closing_flag = $spaces;
        $vt_seqno        = $type_sequence_to_go[$iend];
        $vt_valid_flag   = 1;

    }
    else {
        ## none of the above
    }

    # get the sequence numbers of the ends of this line
    $vt_seqno_beg = $type_sequence_to_go[$ibeg];
    if ( !$vt_seqno_beg ) {
        if ( $types_to_go[$ibeg] eq 'q' ) {
            $vt_seqno_beg = $self->get_seqno( $ibeg, $ending_in_quote );
        }
        else { $vt_seqno_beg = EMPTY_STRING }
    }

    $vt_seqno_end = $type_sequence_to_go[$iend];
    if ( !$vt_seqno_end ) {
        if ( $types_to_go[$iend] eq 'q' ) {
            $vt_seqno_end = $self->get_seqno( $iend, $ending_in_quote );
        }
        else { $vt_seqno_end = EMPTY_STRING }
    }

    if ( !defined($vt_seqno) ) { $vt_seqno = EMPTY_STRING }

    my $rvertical_tightness_flags = {
        _vt_type         => $vt_type,
        _vt_opening_flag => $vt_opening_flag,
        _vt_closing_flag => $vt_closing_flag,
        _vt_seqno        => $vt_seqno,
        _vt_valid_flag   => $vt_valid_flag,
        _vt_seqno_beg    => $vt_seqno_beg,
        _vt_seqno_end    => $vt_seqno_end,
        _vt_min_lines    => $vt_min_lines,
        _vt_max_lines    => $vt_max_lines,
    };

    return ($rvertical_tightness_flags);
} ## end sub set_vertical_tightness_flags

##########################################################
# CODE SECTION 14: Code for creating closing side comments
##########################################################

{    ## begin closure accumulate_csc_text

# These routines are called once per batch when the --closing-side-comments flag
# has been set.

    my %block_leading_text;
    my %block_opening_line_number;
    my $csc_new_statement_ok;
    my $csc_last_label;
    my %csc_block_label;
    my $accumulating_text_for_block;
    my $leading_block_text;
    my $rleading_block_if_elsif_text;
    my $leading_block_text_level;
    my $leading_block_text_length_exceeded;
    my $leading_block_text_line_length;
    my $leading_block_text_line_number;

    sub initialize_csc_vars {
        %block_leading_text           = ();
        %block_opening_line_number    = ();
        $csc_new_statement_ok         = 1;
        $csc_last_label               = EMPTY_STRING;
        %csc_block_label              = ();
        $rleading_block_if_elsif_text = [];
        $accumulating_text_for_block  = EMPTY_STRING;
        reset_block_text_accumulator();
        return;
    } ## end sub initialize_csc_vars

    sub reset_block_text_accumulator {

        # save text after 'if' and 'elsif' to append after 'else'
        if ($accumulating_text_for_block) {

            ## ( $accumulating_text_for_block =~ /^(if|elsif)$/ ) {
            if ( $is_if_elsif{$accumulating_text_for_block} ) {
                push @{$rleading_block_if_elsif_text}, $leading_block_text;
            }
        }
        $accumulating_text_for_block        = EMPTY_STRING;
        $leading_block_text                 = EMPTY_STRING;
        $leading_block_text_level           = 0;
        $leading_block_text_length_exceeded = 0;
        $leading_block_text_line_number     = 0;
        $leading_block_text_line_length     = 0;
        return;
    } ## end sub reset_block_text_accumulator

    sub set_block_text_accumulator {
        my ( $self, $i ) = @_;
        $accumulating_text_for_block = $tokens_to_go[$i];
        if ( $accumulating_text_for_block !~ /^els/ ) {
            $rleading_block_if_elsif_text = [];
        }
        $leading_block_text                 = EMPTY_STRING;
        $leading_block_text_level           = $levels_to_go[$i];
        $leading_block_text_line_number     = $self->get_output_line_number();
        $leading_block_text_length_exceeded = 0;

        # this will contain the column number of the last character
        # of the closing side comment
        $leading_block_text_line_length =
          length($csc_last_label) +
          length($accumulating_text_for_block) +
          length( $rOpts->{'closing-side-comment-prefix'} ) +
          $leading_block_text_level * $rOpts_indent_columns + 3;
        return;
    } ## end sub set_block_text_accumulator

    sub accumulate_block_text {
        my ( $self, $i ) = @_;

        # accumulate leading text for -csc, ignoring any side comments
        if (   $accumulating_text_for_block
            && !$leading_block_text_length_exceeded
            && $types_to_go[$i] ne '#' )
        {

            my $added_length = $token_lengths_to_go[$i];
            $added_length += 1 if $i == 0;
            my $new_line_length =
              $leading_block_text_line_length + $added_length;

            # we can add this text if we don't exceed some limits..
            if (

                # we must not have already exceeded the text length limit
                length($leading_block_text) <
                $rOpts_closing_side_comment_maximum_text

                # and either:
                # the new total line length must be below the line length limit
                # or the new length must be below the text length limit
                # (ie, we may allow one token to exceed the text length limit)
                && (
                    $new_line_length <
                    $maximum_line_length_at_level[$leading_block_text_level]

                    || length($leading_block_text) + $added_length <
                    $rOpts_closing_side_comment_maximum_text
                )

               # UNLESS: we are adding a closing paren before the brace we seek.
               # This is an attempt to avoid situations where the ... to be
               # added are longer than the omitted right paren, as in:

             #   foreach my $item (@a_rather_long_variable_name_here) {
             #      &whatever;
             #   } ## end foreach my $item (@a_rather_long_variable_name_here...

                || (
                    $tokens_to_go[$i] eq ')'
                    && (
                        (
                               $i + 1 <= $max_index_to_go
                            && $block_type_to_go[ $i + 1 ]
                            && $block_type_to_go[ $i + 1 ] eq
                            $accumulating_text_for_block
                        )
                        || (   $i + 2 <= $max_index_to_go
                            && $block_type_to_go[ $i + 2 ]
                            && $block_type_to_go[ $i + 2 ] eq
                            $accumulating_text_for_block )
                    )
                )
              )
            {

                # add an extra space at each newline
                if ( $i == 0 && $types_to_go[$i] ne 'b' ) {
                    $leading_block_text .= SPACE;
                }

                # add the token text
                $leading_block_text .= $tokens_to_go[$i];
                $leading_block_text_line_length = $new_line_length;
            }

            # show that text was truncated if necessary
            elsif ( $types_to_go[$i] ne 'b' ) {
                $leading_block_text_length_exceeded = 1;
                $leading_block_text .= '...';
            }
            else {
                ## ok
            }
        }
        return;
    } ## end sub accumulate_block_text

    sub accumulate_csc_text {

        my ($self) = @_;

        # called once per output buffer when -csc is used. Accumulates
        # the text placed after certain closing block braces.
        # Defines and returns the following for this buffer:

        my $block_leading_text =
          EMPTY_STRING;    # the leading text of the last '}'
        my $rblock_leading_if_elsif_text;
        my $i_block_leading_text =
          -1;              # index of token owning block_leading_text
        my $block_line_count    = 100;          # how many lines the block spans
        my $terminal_type       = 'b';          # type of last nonblank token
        my $i_terminal          = 0;            # index of last nonblank token
        my $terminal_block_type = EMPTY_STRING;

        # update most recent statement label
        $csc_last_label = EMPTY_STRING unless ($csc_last_label);
        if ( $types_to_go[0] eq 'J' ) { $csc_last_label = $tokens_to_go[0] }
        my $block_label = $csc_last_label;

        # Loop over all tokens of this batch
        for my $i ( 0 .. $max_index_to_go ) {
            my $type       = $types_to_go[$i];
            my $block_type = $block_type_to_go[$i];
            my $token      = $tokens_to_go[$i];
            $block_type = EMPTY_STRING unless ($block_type);

            # remember last nonblank token type
            if ( $type ne '#' && $type ne 'b' ) {
                $terminal_type       = $type;
                $terminal_block_type = $block_type;
                $i_terminal          = $i;
            }

            my $type_sequence = $type_sequence_to_go[$i];
            if ( $block_type && $type_sequence ) {

                if ( $token eq '}' ) {

                    # restore any leading text saved when we entered this block
                    if ( defined( $block_leading_text{$type_sequence} ) ) {
                        ( $block_leading_text, $rblock_leading_if_elsif_text )
                          = @{ $block_leading_text{$type_sequence} };
                        $i_block_leading_text = $i;
                        delete $block_leading_text{$type_sequence};
                        $rleading_block_if_elsif_text =
                          $rblock_leading_if_elsif_text;
                    }

                    if ( defined( $csc_block_label{$type_sequence} ) ) {
                        $block_label = $csc_block_label{$type_sequence};
                        delete $csc_block_label{$type_sequence};
                    }

                    # if we run into a '}' then we probably started accumulating
                    # at something like a trailing 'if' clause..no harm done.
                    if (   $accumulating_text_for_block
                        && $levels_to_go[$i] <= $leading_block_text_level )
                    {
                        my $lev = $levels_to_go[$i];
                        reset_block_text_accumulator();
                    }

                    if ( defined( $block_opening_line_number{$type_sequence} ) )
                    {
                        my $output_line_number =
                          $self->get_output_line_number();
                        $block_line_count =
                          $output_line_number -
                          $block_opening_line_number{$type_sequence} + 1;
                        delete $block_opening_line_number{$type_sequence};
                    }
                    else {

                        # Error: block opening line undefined for this line..
                        # This shouldn't be possible, but it is not a
                        # significant problem.
                    }
                }

                elsif ( $token eq '{' ) {

                    my $line_number = $self->get_output_line_number();
                    $block_opening_line_number{$type_sequence} = $line_number;

                    # set a label for this block, except for
                    # a bare block which already has the label
                    # A label can only be used on the next {
                    if ( $block_type =~ /:$/ ) {
                        $csc_last_label = EMPTY_STRING;
                    }
                    $csc_block_label{$type_sequence} = $csc_last_label;
                    $csc_last_label = EMPTY_STRING;

                    if (   $accumulating_text_for_block
                        && $levels_to_go[$i] == $leading_block_text_level )
                    {

                        if ( $accumulating_text_for_block eq $block_type ) {

                            # save any leading text before we enter this block
                            $block_leading_text{$type_sequence} = [
                                $leading_block_text,
                                $rleading_block_if_elsif_text
                            ];
                            $block_opening_line_number{$type_sequence} =
                              $leading_block_text_line_number;
                            reset_block_text_accumulator();
                        }
                        else {

                            # shouldn't happen, but not a serious error.
                            # We were accumulating -csc text for block type
                            # $accumulating_text_for_block and unexpectedly
                            # encountered a '{' for block type $block_type.
                        }
                    }
                }
                else {
                    ## should not get here
                    DEVEL_MODE
                      && Fault("token=$token should be '{' or '}' for block\n");
                }
            }

            if (   $type eq 'k'
                && $csc_new_statement_ok
                && $is_if_elsif_else_unless_while_until_for_foreach{$token}
                && $token =~ /$closing_side_comment_list_pattern/ )
            {
                $self->set_block_text_accumulator($i);
            }
            else {

                # note: ignoring type 'q' because of tricks being played
                # with 'q' for hanging side comments
                if ( $type ne 'b' && $type ne '#' && $type ne 'q' ) {
                    $csc_new_statement_ok =
                      ( $block_type || $type eq 'J' || $type eq ';' );
                }
                if (   $type eq ';'
                    && $accumulating_text_for_block
                    && $levels_to_go[$i] == $leading_block_text_level )
                {
                    reset_block_text_accumulator();
                }
                else {
                    $self->accumulate_block_text($i);
                }
            }
        }

        # Treat an 'else' block specially by adding preceding 'if' and
        # 'elsif' text.  Otherwise, the 'end else' is not helpful,
        # especially for cuddled-else formatting.
        if ( $terminal_block_type =~ /^els/ && $rblock_leading_if_elsif_text ) {
            $block_leading_text =
              $self->make_else_csc_text( $i_terminal, $terminal_block_type,
                $block_leading_text, $rblock_leading_if_elsif_text );
        }

        # if this line ends in a label then remember it for the next pass
        $csc_last_label = EMPTY_STRING;
        if ( $terminal_type eq 'J' ) {
            $csc_last_label = $tokens_to_go[$i_terminal];
        }

        return ( $terminal_type, $i_terminal, $i_block_leading_text,
            $block_leading_text, $block_line_count, $block_label );
    } ## end sub accumulate_csc_text

    sub make_else_csc_text {

        # create additional -csc text for an 'else' and optionally 'elsif',
        # depending on the value of switch
        #
        #  = 0 add 'if' text to trailing else
        #  = 1 same as 0 plus:
        #      add 'if' to 'elsif's if can fit in line length
        #      add last 'elsif' to trailing else if can fit in one line
        #  = 2 same as 1 but do not check if exceed line length
        #
        # $rif_elsif_text = a reference to a list of all previous closing
        # side comments created for this if block
        #
        my ( $self, $i_terminal, $block_type, $block_leading_text,
            $rif_elsif_text )
          = @_;
        my $csc_text = $block_leading_text;

        if (   $block_type eq 'elsif'
            && $rOpts_closing_side_comment_else_flag == 0 )
        {
            return $csc_text;
        }

        my $count = @{$rif_elsif_text};
        return $csc_text unless ($count);

        my $if_text = '[ if' . $rif_elsif_text->[0];

        # always show the leading 'if' text on 'else'
        if ( $block_type eq 'else' ) {
            $csc_text .= $if_text;
        }

        # see if that's all
        if ( $rOpts_closing_side_comment_else_flag == 0 ) {
            return $csc_text;
        }

        my $last_elsif_text = EMPTY_STRING;
        if ( $count > 1 ) {
            $last_elsif_text = ' [elsif' . $rif_elsif_text->[ $count - 1 ];
            if ( $count > 2 ) { $last_elsif_text = ' [...' . $last_elsif_text; }
        }

        # tentatively append one more item
        my $saved_text = $csc_text;
        if ( $block_type eq 'else' ) {
            $csc_text .= $last_elsif_text;
        }
        else {
            $csc_text .= SPACE . $if_text;
        }

        # all done if no length checks requested
        if ( $rOpts_closing_side_comment_else_flag == 2 ) {
            return $csc_text;
        }

        # undo it if line length exceeded
        my $length =
          length($csc_text) +
          length($block_type) +
          length( $rOpts->{'closing-side-comment-prefix'} ) +
          $levels_to_go[$i_terminal] * $rOpts_indent_columns + 3;
        if (
            $length > $maximum_line_length_at_level[$leading_block_text_level] )
        {
            $csc_text = $saved_text;
        }
        return $csc_text;
    } ## end sub make_else_csc_text
} ## end closure accumulate_csc_text

{    ## begin closure balance_csc_text

    # Some additional routines for handling the --closing-side-comments option

    my %matching_char;

    BEGIN {
        %matching_char = (
            '{' => '}',
            '(' => ')',
            '[' => ']',
            '}' => '{',
            ')' => '(',
            ']' => '[',
        );
    } ## end BEGIN

    sub balance_csc_text {

        # Append characters to balance a closing side comment so that editors
        # such as vim can correctly jump through code.
        # Simple Example:
        #  input  = ## end foreach my $foo ( sort { $b  ...
        #  output = ## end foreach my $foo ( sort { $b  ...})

        # NOTE: This routine does not currently filter out structures within
        # quoted text because the bounce algorithms in text editors do not
        # necessarily do this either (a version of vim was checked and
        # did not do this).

        # Some complex examples which will cause trouble for some editors:
        #  while ( $mask_string =~ /\{[^{]*?\}/g ) {
        #  if ( $mask_str =~ /\}\s*els[^\{\}]+\{$/ ) {
        #  if ( $1 eq '{' ) {
        # test file test1/braces.pl has many such examples.

        my ($csc) = @_;

        # loop to examine characters one-by-one, RIGHT to LEFT and
        # build a balancing ending, LEFT to RIGHT.
        foreach my $pos ( reverse( 0 .. length($csc) - 1 ) ) {

            my $char = substr( $csc, $pos, 1 );

            # ignore everything except structural characters
            next unless ( $matching_char{$char} );

            # pop most recently appended character
            my $top = chop($csc);

            # push it back plus the mate to the newest character
            # unless they balance each other.
            $csc = $csc . $top . $matching_char{$char} unless $top eq $char;
        }

        # return the balanced string
        return $csc;
    } ## end sub balance_csc_text
} ## end closure balance_csc_text

sub add_closing_side_comment {

    my ( $self, $ri_first, $ri_last ) = @_;
    my $rLL = $self->[_rLL_];

    # add closing side comments after closing block braces if -csc used
    my ( $closing_side_comment, $cscw_block_comment );

    #---------------------------------------------------------------
    # Step 1: loop through all tokens of this line to accumulate
    # the text needed to create the closing side comments. Also see
    # how the line ends.
    #---------------------------------------------------------------

    my ( $terminal_type, $i_terminal, $i_block_leading_text,
        $block_leading_text, $block_line_count, $block_label )
      = $self->accumulate_csc_text();

    #---------------------------------------------------------------
    # Step 2: make the closing side comment if this ends a block
    #---------------------------------------------------------------
    my $have_side_comment = $types_to_go[$max_index_to_go] eq '#';

    # if this line might end in a block closure..
    if (
        $terminal_type eq '}'

        # Fix 1 for c091, this is only for blocks
        && $block_type_to_go[$i_terminal]

        # ..and either
        && (

            # the block is long enough
            ( $block_line_count >= $rOpts->{'closing-side-comment-interval'} )

            # or there is an existing comment to check
            || (   $have_side_comment
                && $rOpts->{'closing-side-comment-warnings'} )
        )

        # .. and if this is one of the types of interest
        && $block_type_to_go[$i_terminal] =~
        /$closing_side_comment_list_pattern/

        # .. but not an anonymous sub
        # These are not normally of interest, and their closing braces are
        # often followed by commas or semicolons anyway.  This also avoids
        # possible erratic output due to line numbering inconsistencies
        # in the cases where their closing braces terminate a line.
        && $block_type_to_go[$i_terminal] ne 'sub'

        # ..and the corresponding opening brace must is not in this batch
        # (because we do not need to tag one-line blocks, although this
        # should also be caught with a positive -csci value)
        && !defined( $mate_index_to_go[$i_terminal] )

        # ..and either
        && (

            # this is the last token (line doesn't have a side comment)
            !$have_side_comment

            # or the old side comment is a closing side comment
            || $tokens_to_go[$max_index_to_go] =~
            /$closing_side_comment_prefix_pattern/
        )
      )
    {

        # then make the closing side comment text
        if ($block_label) { $block_label .= SPACE }
        my $token =
"$rOpts->{'closing-side-comment-prefix'} $block_label$block_type_to_go[$i_terminal]";

        # append any extra descriptive text collected above
        if ( $i_block_leading_text == $i_terminal ) {
            $token .= $block_leading_text;
        }

        $token = balance_csc_text($token)
          if $rOpts->{'closing-side-comments-balanced'};

        $token =~ s/\s*$//;    # trim any trailing whitespace

        # handle case of existing closing side comment
        if ($have_side_comment) {

            # warn if requested and tokens differ significantly
            if ( $rOpts->{'closing-side-comment-warnings'} ) {
                my $old_csc = $tokens_to_go[$max_index_to_go];
                my $new_csc = $token;
                $new_csc =~ s/\s+//g;            # trim all whitespace
                $old_csc =~ s/\s+//g;            # trim all whitespace
                $new_csc =~ s/[\]\)\}\s]*$//;    # trim trailing structures
                $old_csc =~ s/[\]\)\}\s]*$//;    # trim trailing structures

                # trim trailing '...'
                my $new_trailing_dots = $new_csc =~ s/\.\.\.$//;
                $old_csc =~ s/\.\.\.\s*$//;

                # Patch to handle multiple closing side comments at
                # else and elsif's.  These have become too complicated
                # to check, so if we see an indication of
                # '[ if' or '[ # elsif', then assume they were made
                # by perltidy.
                if ( $block_type_to_go[$i_terminal] eq 'else' ) {
                    if ( $old_csc =~ /\[\s*elsif/ ) { $old_csc = $new_csc }
                }
                elsif ( $block_type_to_go[$i_terminal] eq 'elsif' ) {
                    if ( $old_csc =~ /\[\s*if/ ) { $old_csc = $new_csc }
                }
                else {
                    ## ok: neither else or elsif
                }

                # if old comment is contained in new comment,
                # only compare the common part.
                if ( length($new_csc) > length($old_csc) ) {
                    $new_csc = substr( $new_csc, 0, length($old_csc) );
                }

                # if the new comment is shorter and has been limited,
                # only compare the common part.
                if ( length($new_csc) < length($old_csc)
                    && $new_trailing_dots )
                {
                    $old_csc = substr( $old_csc, 0, length($new_csc) );
                }

                # any remaining difference?
                if ( $new_csc ne $old_csc ) {

                    # just leave the old comment if we are below the threshold
                    # for creating side comments
                    if ( $block_line_count <
                        $rOpts->{'closing-side-comment-interval'} )
                    {
                        $token = undef;
                    }

                    # otherwise we'll make a note of it
                    else {

                        my $msg_line_number;
                        my $K = $K_to_go[$i_terminal];
                        if ( defined($K) ) {
                            $msg_line_number = $rLL->[$K]->[_LINE_INDEX_] + 1;
                        }
                        warning(
"perltidy -cscw replaced: $tokens_to_go[$max_index_to_go]\n",
                            $msg_line_number
                        );

                        # save the old side comment in a new trailing block
                        # comment
                        my $timestamp = EMPTY_STRING;
                        if ( $rOpts->{'timestamp'} ) {
                            my ( $day, $month, $year ) = (localtime)[ 3, 4, 5 ];
                            $year  += 1900;
                            $month += 1;
                            $timestamp = "$year-$month-$day";
                        }
                        $cscw_block_comment =
"## perltidy -cscw $timestamp: $tokens_to_go[$max_index_to_go]";
                    }
                }

                # No differences.. we can safely delete old comment if we
                # are below the threshold
                elsif ( $block_line_count <
                    $rOpts->{'closing-side-comment-interval'} )
                {
                    # Since the line breaks have already been set, we have
                    # to remove the token from the _to_go array and also
                    # from the line range (this fixes issue c081).
                    # Note that we can only get here if -cscw has been set
                    # because otherwise the old comment is already deleted.
                    $token = undef;
                    my $ibeg = $ri_first->[-1];
                    my $iend = $ri_last->[-1];
                    if (   $iend > $ibeg
                        && $iend == $max_index_to_go
                        && $types_to_go[$max_index_to_go] eq '#' )
                    {
                        $iend--;
                        $max_index_to_go--;
                        if (   $iend > $ibeg
                            && $types_to_go[$max_index_to_go] eq 'b' )
                        {
                            $iend--;
                            $max_index_to_go--;
                        }
                        $ri_last->[-1] = $iend;
                    }
                }
                else {
                    ## above threshold, cannot delete
                }
            }

            # switch to the new csc (unless we deleted it!)
            if ($token) {

                my $len_tok = length($token); # NOTE: length no longer important
                my $added_len =
                  $len_tok - $token_lengths_to_go[$max_index_to_go];

                $tokens_to_go[$max_index_to_go]        = $token;
                $token_lengths_to_go[$max_index_to_go] = $len_tok;
                my $K = $K_to_go[$max_index_to_go];
                $rLL->[$K]->[_TOKEN_]        = $token;
                $rLL->[$K]->[_TOKEN_LENGTH_] = $len_tok;
                $summed_lengths_to_go[ $max_index_to_go + 1 ] += $added_len;
            }
        }

        # handle case of NO existing closing side comment
        else {

            # To avoid inserting a new token in the token arrays, we
            # will just return the new side comment so that it can be
            # inserted just before it is needed in the call to the
            # vertical aligner.
            $closing_side_comment = $token;
        }
    }
    return ( $closing_side_comment, $cscw_block_comment );
} ## end sub add_closing_side_comment

############################
# CODE SECTION 15: Summarize
############################

sub wrapup {

    # This is the last routine called when a file is formatted.
    # Flush buffer and write any informative messages
    my ( $self, $severe_error ) = @_;

    $self->flush();
    my $file_writer_object = $self->[_file_writer_object_];
    $file_writer_object->decrement_output_line_number()
      ;    # fix up line number since it was incremented
    we_are_at_the_last_line();

    my $max_depth = $self->[_maximum_BLOCK_level_];
    my $at_line   = $self->[_maximum_BLOCK_level_at_line_];
    write_logfile_entry(
"Maximum leading structural depth is $max_depth in input at line $at_line\n"
    );

    my $added_semicolon_count    = $self->[_added_semicolon_count_];
    my $first_added_semicolon_at = $self->[_first_added_semicolon_at_];
    my $last_added_semicolon_at  = $self->[_last_added_semicolon_at_];

    if ( $added_semicolon_count > 0 ) {
        my $first = ( $added_semicolon_count > 1 ) ? "First" : EMPTY_STRING;
        my $what =
          ( $added_semicolon_count > 1 ) ? "semicolons were" : "semicolon was";
        write_logfile_entry("$added_semicolon_count $what added:\n");
        write_logfile_entry(
            "  $first at input line $first_added_semicolon_at\n");

        if ( $added_semicolon_count > 1 ) {
            write_logfile_entry(
                "   Last at input line $last_added_semicolon_at\n");
        }
        write_logfile_entry("  (Use -nasc to prevent semicolon addition)\n");
        write_logfile_entry("\n");
    }

    my $deleted_semicolon_count    = $self->[_deleted_semicolon_count_];
    my $first_deleted_semicolon_at = $self->[_first_deleted_semicolon_at_];
    my $last_deleted_semicolon_at  = $self->[_last_deleted_semicolon_at_];
    if ( $deleted_semicolon_count > 0 ) {
        my $first = ( $deleted_semicolon_count > 1 ) ? "First" : EMPTY_STRING;
        my $what =
          ( $deleted_semicolon_count > 1 )
          ? "semicolons were"
          : "semicolon was";
        write_logfile_entry(
            "$deleted_semicolon_count unnecessary $what deleted:\n");
        write_logfile_entry(
            "  $first at input line $first_deleted_semicolon_at\n");

        if ( $deleted_semicolon_count > 1 ) {
            write_logfile_entry(
                "   Last at input line $last_deleted_semicolon_at\n");
        }
        write_logfile_entry("  (Use -ndsm to prevent semicolon deletion)\n");
        write_logfile_entry("\n");
    }

    my $embedded_tab_count    = $self->[_embedded_tab_count_];
    my $first_embedded_tab_at = $self->[_first_embedded_tab_at_];
    my $last_embedded_tab_at  = $self->[_last_embedded_tab_at_];
    if ( $embedded_tab_count > 0 ) {
        my $first = ( $embedded_tab_count > 1 ) ? "First" : EMPTY_STRING;
        my $what =
          ( $embedded_tab_count > 1 )
          ? "quotes or patterns"
          : "quote or pattern";
        write_logfile_entry("$embedded_tab_count $what had embedded tabs:\n");
        write_logfile_entry(
"This means the display of this script could vary with device or software\n"
        );
        write_logfile_entry("  $first at input line $first_embedded_tab_at\n");

        if ( $embedded_tab_count > 1 ) {
            write_logfile_entry(
                "   Last at input line $last_embedded_tab_at\n");
        }
        write_logfile_entry("\n");
    }

    my $first_tabbing_disagreement = $self->[_first_tabbing_disagreement_];
    my $last_tabbing_disagreement  = $self->[_last_tabbing_disagreement_];
    my $tabbing_disagreement_count = $self->[_tabbing_disagreement_count_];
    my $in_tabbing_disagreement    = $self->[_in_tabbing_disagreement_];

    if ($first_tabbing_disagreement) {
        write_logfile_entry(
"First indentation disagreement seen at input line $first_tabbing_disagreement\n"
        );
    }

    my $first_btd = $self->[_first_brace_tabbing_disagreement_];
    if ($first_btd) {
        my $msg =
"First closing brace indentation disagreement started at input line $first_btd\n";
        write_logfile_entry($msg);

        # leave a hint in the .ERR file if there was a brace error
        if ( get_saw_brace_error() ) { warning("NOTE: $msg") }
    }

    my $in_btd = $self->[_in_brace_tabbing_disagreement_];
    if ($in_btd) {
        my $msg =
"Ending with brace indentation disagreement which started at input line $in_btd\n";
        write_logfile_entry($msg);

        # leave a hint in the .ERR file if there was a brace error
        if ( get_saw_brace_error() ) { warning("NOTE: $msg") }
    }

    if ($in_tabbing_disagreement) {
        my $msg =
"Ending with indentation disagreement which started at input line $in_tabbing_disagreement\n";
        write_logfile_entry($msg);
    }
    else {

        if ($last_tabbing_disagreement) {

            write_logfile_entry(
"Last indentation disagreement seen at input line $last_tabbing_disagreement\n"
            );
        }
        else {
            write_logfile_entry("No indentation disagreement seen\n");
        }
    }

    if ($first_tabbing_disagreement) {
        write_logfile_entry(
"Note: Indentation disagreement detection is not accurate for outdenting and -lp.\n"
        );
    }
    write_logfile_entry("\n");

    my $vao = $self->[_vertical_aligner_object_];
    $vao->report_anything_unusual();

    $file_writer_object->report_line_length_errors();

    # Define the formatter self-check for convergence.
    $self->[_converged_] =
         $severe_error
      || $file_writer_object->get_convergence_check()
      || $rOpts->{'indent-only'};

    return;
} ## end sub wrapup

} ## end package Perl::Tidy::Formatter
1;