File Coverage

blib/lib/HTML/Mason/Interp.pm

Criterion	Covered	Total	%
statement	398	431	92.3
branch	120	156	76.9
condition	27	36	75.0
subroutine	79	85	92.9
pod	13	29	44.8
total	637	737	86.4

# -*- cperl-indent-level: 4; cperl-continued-brace-offset: -4; cperl-continued-statement-offset: 4 -*-

# Copyright (c) 1998-2005 by Jonathan Swartz. All rights reserved.
# This program is free software; you can redistribute it and/or modify it
# under the same terms as Perl itself.

package HTML::Mason::Interp;
$HTML::Mason::Interp::VERSION = '1.60';
use strict;
use warnings;

use File::Basename;
use File::Path;
use File::Spec;
use File::Temp;
use HTML::Mason;
use HTML::Mason::Escapes;
use HTML::Mason::Request;
use HTML::Mason::Resolver::File;
use HTML::Mason::Tools qw(read_file taint_is_on load_pkg);

use HTML::Mason::Exceptions( abbr => [qw(param_error system_error wrong_compiler_error compilation_error error)] );

use Params::Validate qw(:all);
Params::Validate::validation_options( on_fail => sub { param_error join '', @_  } );

use Class::Container;
use base qw(Class::Container);

BEGIN
{
    # Fields that can be set in new method, with defaults
    __PACKAGE__->valid_params
        (
         autohandler_name =>
         { parse => 'string',  default => 'autohandler', type => SCALAR,
           descr => "The filename to use for Mason's 'autohandler' capability" },

         buffer_preallocate_size =>
         { parse => 'string', default => 0, type => SCALAR,
           descr => "Number of bytes to preallocate in request buffer" },

         code_cache_max_size =>
         { parse => 'string',  default => 'unlimited', type => SCALAR,
           descr => "The maximum number of components in the code cache" },

         comp_root =>
         { parse => 'list',
           type => SCALAR|ARRAYREF,
           default => File::Spec->rel2abs( Cwd::cwd ),
           descr => "A string or array of arrays indicating the search path for component calls" },

         compiler =>
         { isa => 'HTML::Mason::Compiler',
           descr => "A Compiler object for compiling components" },

         data_dir =>
         { parse => 'string', optional => 1, type => SCALAR,
           descr => "A directory for storing cache files and other state information" },

         dynamic_comp_root =>
         { parse => 'boolean', default => 0, type => BOOLEAN,
           descr => "Indicates whether the comp_root may be changed between requests" },

         escape_flags =>
         { parse => 'hash_list', optional => 1, type => HASHREF,
           descr => "A list of escape flags to set (as if calling the set_escape() method" },

         object_file_extension =>
         { parse => 'string',  type => SCALAR, default => '.obj',
           descr => "Extension to add to the end of object files" },

         # OBJECT cause qr// returns an object
         ignore_warnings_expr =>
         { parse => 'string',  type => SCALAR|OBJECT, default => qr/Subroutine .* redefined/i,
           descr => "A regular expression describing Perl warning messages to ignore" },

         preloads =>
         { parse => 'list', optional => 1, type => ARRAYREF,
           descr => "A list of components to load immediately when creating the Interpreter" },

         resolver =>
         { isa => 'HTML::Mason::Resolver',
           descr => "A Resolver object for fetching components from storage" },

         static_source =>
         { parse => 'boolean', default => 0, type => BOOLEAN,
           descr => "When true, we only compile source files once" },

         static_source_touch_file =>
         { parse => 'string', optional => 1, type => SCALAR,
           descr => "A file that, when touched, causes Mason to clear its component caches" },

         use_object_files =>
         { parse => 'boolean', default => 1, type => BOOLEAN,
           descr => "Whether to cache component objects on disk" },
        );

    __PACKAGE__->contained_objects
        (
         resolver => { class => 'HTML::Mason::Resolver::File',
                       descr => "This class is expected to return component information based on a component path" },
         compiler => { class => 'HTML::Mason::Compiler::ToObject',
                       descr => "This class is used to translate component source into code" },
         request  => { class => 'HTML::Mason::Request',
                       delayed => 1,
                       descr => "Objects returned by make_request are members of this class" },
        );
}

use HTML::Mason::MethodMaker
    ( read_only => [ qw( autohandler_name
                         buffer_preallocate_size
                         code_cache
                         code_cache_min_size
                         code_cache_max_size
                         compiler
                         data_dir
                         dynamic_comp_root
                         object_file_extension
                         preallocated_output_buffer
                         preloads
                         resolver
                         source_cache
                         static_source
                         static_source_touch_file
                         use_internal_component_caches
                         use_object_files
                        ) ],

      read_write => [ map { [ $_ => __PACKAGE__->validation_spec->{$_} ] }
                      qw( ignore_warnings_expr
                         )
                    ],

      read_write_contained => { request =>
                                [ [ autoflush => { type => BOOLEAN } ],
                                  [ data_cache_api => { type => SCALAR } ],
                                  [ data_cache_defaults => { type => HASHREF } ],
                                  [ dhandler_name => { type => SCALAR } ],
                                  [ error_format => { type => SCALAR } ],
                                  [ error_mode => { type => SCALAR } ],
                                  [ max_recurse => { type => SCALAR } ],
                                  [ out_method => { type => SCALARREF | CODEREF } ],
                                  [ plugins => { type => ARRAYREF } ],
                                ]
                              },
      );

sub new
{
    my $class = shift;
    my $self = $class->SUPER::new(@_);

    $self->_initialize;
    return $self;
}

sub _initialize
{
    my ($self) = shift;
    $self->{code_cache} = {};
    $self->{source_cache} = {};
    $self->{files_written} = [];
    $self->{static_source_touch_file_lastmod} = 0;

    $self->_assign_comp_root($self->{comp_root});
    $self->_check_data_dir();
    $self->_create_data_subdirs();
    $self->_initialize_escapes();

    #
    # Create preallocated buffer for requests.
    #
    $self->{preallocated_output_buffer} = ' ' x $self->buffer_preallocate_size;

    $self->_set_code_cache_attributes();

    #
    # If static_source=1, unlimited_code_cache=1, and
    # dynamic_comp_root=0, we can safely cache component objects keyed
    # on path throughout the framework (e.g. within other component
    # objects). These internal caches can be cleared in
    # $interp->flush_code_cache (the only legimiate place for a
    # component to be eliminated from the cache), eliminating any
    # chance for leaked objects.
    #
    # static_source has to be on or else we might keep around
    # old versions of components that have changed.
    #
    # unlimited_code_cache has to be on or else we might leak
    # components when we discard.
    #
    # dynamic_comp_root has to be 0 because the cache would not be
    # valid for different combinations of component root across
    # different requests.
    #
    $self->{use_internal_component_caches} =
        ($self->{static_source} &&
         $self->{unlimited_code_cache} &&
         !$self->{dynamic_comp_root});

    $self->_preload_components();
}

sub _check_data_dir
{
    my $self = shift;

    return unless $self->{data_dir};

    $self->{data_dir} = File::Spec->canonpath( $self->{data_dir} );
    param_error "data_dir '$self->{data_dir}' must be an absolute directory"
        unless File::Spec->file_name_is_absolute( $self->{data_dir} );
}

sub _create_data_subdirs
{
    my $self = shift;

    if ($self->data_dir) {
        $self->_make_object_dir;
        $self->_make_cache_dir;
    } else {
        $self->{use_object_files} = 0;
    }
}

sub _initialize_escapes
{
    my $self = shift;

    #
    # Add the escape flags (including defaults)
    #
    foreach ( [ h => \&HTML::Mason::Escapes::html_entities_escape ],
              [ u => \&HTML::Mason::Escapes::url_escape ],
            )
    {
        $self->set_escape(@$_);
    }

    if ( my $e = delete $self->{escape_flags} )
    {
        while ( my ($flag, $code) = each %$e )
        {
            $self->set_escape( $flag => $code );
        }
    }
}

sub _set_code_cache_attributes
{
    my $self = shift;

    $self->{unlimited_code_cache} = ($self->{code_cache_max_size} eq 'unlimited');
    unless ($self->{unlimited_code_cache}) {
        $self->{code_cache_min_size} = $self->{code_cache_max_size} * 0.75;
    }
}

sub _preload_components
{
    my $self = shift;

    return unless $self->preloads;

    foreach my $pattern (@{$self->preloads}) {
        error "preload pattern '$pattern' must be an absolute path"
            unless File::Spec->file_name_is_absolute($pattern);
        my %path_hash;
        foreach my $pair ($self->comp_root_array) {
            my $root = $pair->[1];
            foreach my $path ($self->resolver->glob_path($pattern, $root)) {
                $path_hash{$path}++;
            }
        }
        my @paths = keys(%path_hash);
        warn "Didn't find any components for preload pattern '$pattern'"
            unless @paths;
        foreach (@paths)
        {
            $self->load($_)
                or error "Cannot load component $_, found via pattern $pattern";
        }
    }
}

#
# Functions for retrieving and creating data subdirectories.
#
sub object_dir { my $self = shift; return $self->data_dir ? File::Spec->catdir( $self->data_dir, 'obj' ) : ''; }
sub object_create_marker_file { my $self = shift; return $self->object_dir ? File::Spec->catfile($self->object_dir, '.__obj_create_marker') : ''; }
sub cache_dir  { my $self = shift; return $self->data_dir ? File::Spec->catdir( $self->data_dir, 'cache' ) : ''; }

sub _make_data_subdir
{
    my ($self, $dir) = @_;

    unless (-d $dir) {
        my @newdirs = eval { mkpath( $dir, 0, 0775 ) };
        if ($@) {
            my $user  = getpwuid($<);
            my $group = getgrgid($();
            my $data_dir = $self->data_dir;
            error "Cannot create directory '$dir' ($@) for user '$user', group '$group'. " .
                "Perhaps you need to create or set permissions on your data_dir ('$data_dir'). ";
        }
        $self->push_files_written(@newdirs);
    }
}

sub _make_object_dir
{
    my ($self) = @_;

    my $object_dir = $self->object_dir;
    $self->_make_data_subdir($object_dir);
    my $object_create_marker_file = $self->object_create_marker_file;
    unless (-f $object_create_marker_file) {
        open my $fh, ">$object_create_marker_file"
            or system_error "Could not create '$object_create_marker_file': $!";
        $self->push_files_written($object_create_marker_file);
    }
}

sub _make_cache_dir
{
    my ($self) = @_;

    my $cache_dir = $self->cache_dir;
    $self->_make_data_subdir($cache_dir);
}

#
# exec is the initial entry point for executing a component
# in a new request.
#
sub exec {
    my $self = shift;
    my $comp = shift;
    $self->make_request(comp=>$comp, args=>\@_)->exec;
}

sub make_request {
    my $self = shift;

    return $self->create_delayed_object( 'request', interp => $self, @_ );
}

sub comp_exists {
    my ($self, $path) = @_;
    return $self->resolve_comp_path_to_source($path);
}

#
# Load <$path> into a component, possibly parsing the source and/or
# caching the code. Returns a component object or undef if the
# component was not found.
#
sub load {
    my ($self, $path) = @_;
    my ($maxfilemod, $objfile, $objfilemod);
    my $code_cache = $self->{code_cache};
    my $resolver = $self->{resolver};

    #
    # Path must be absolute.
    #
    unless (substr($path, 0, 1) eq '/') {
        error "Component path given to Interp->load must be absolute (was given $path)";
    }

    #
    # Get source info from resolver.
    #
    my $source = $self->resolve_comp_path_to_source($path);

    # No component matches this path.
    return unless defined $source;

    # comp_id is the unique name for the component, used for cache key
    # and object file name.
    my $comp_id = $source->comp_id;

    #
    # Get last modified time of source.
    #
    my $srcmod = $source->last_modified;

    #
    # If code cache contains an up to date entry for this path, use
    # the cached comp.  Always use the cached comp in static_source
    # mode.
    #
    if ( exists $code_cache->{$comp_id} &&
         ( $self->static_source || $code_cache->{$comp_id}->{lastmod} >= $srcmod )
       ) {
        return $code_cache->{$comp_id}->{comp};
    }

    if ($self->{use_object_files}) {
        $objfile = $self->comp_id_to_objfile($comp_id);

        my @stat = stat $objfile;
        if ( @stat && ! -f _ ) {
            error "The object file '$objfile' exists but it is not a file!";
        }

        if ($self->static_source) {
            # No entry in the code cache so if the object file exists,
            # we will use it, otherwise we must create it.  These
            # values make that happen.
            $objfilemod = @stat ? $srcmod : 0;
        } else {
            # If the object file exists, get its modification time.
            # Otherwise (it doesn't exist or it is a directory) we
            # must create it.
            $objfilemod = @stat ? $stat[9] : 0;
        }
    }

    my $comp;
    if ($objfile) {
        #
        # We are using object files.  Update object file if necessary
        # and load component from there.
        #
        # If loading the object file generates an error, or results in
        # a non-component object, try regenerating the object file
        # once before giving up and reporting an error. This can be
        # handy in the rare case of an empty or corrupted object file.
        # (But add an exception for "Compilation failed in require" errors, since
        # the bad module will be added to %INC and the error will not occur
        # the second time - RT #39803).
        #
        if ($objfilemod < $srcmod) {
            $self->compiler->compile_to_file( file => $objfile, source => $source);
        }
        $comp = eval { $self->eval_object_code( object_file => $objfile ) };

        if (!UNIVERSAL::isa($comp, 'HTML::Mason::Component')) {
            if (!defined($@) || $@ !~ /failed in require/) {
                $self->compiler->compile_to_file( file => $objfile, source => $source);
                $comp = eval { $self->eval_object_code( object_file => $objfile ) };
            }

            if (!UNIVERSAL::isa($comp, 'HTML::Mason::Component')) {
                my $error = $@ ? $@ : "Could not get HTML::Mason::Component object from object file '$objfile'";
                $self->_compilation_error( $source->friendly_name, $error );
            }
        }
    } else {
        #
        # Not using object files. Load component directly into memory.
        #
        my $object_code = $source->object_code( compiler => $self->compiler );
        $comp = eval { $self->eval_object_code( object_code => $object_code ) };
        $self->_compilation_error( $source->friendly_name, $@ ) if $@;
    }
    $comp->assign_runtime_properties($self, $source);

    #
    # Delete any stale cached version of this component, then
    # cache it.
    #
    $self->delete_from_code_cache($comp_id);
    $code_cache->{$comp_id} = { lastmod => $srcmod, comp => $comp };

    return $comp;
}

sub delete_from_code_cache {
    my ($self, $comp_id) = @_;
    return unless defined $self->{code_cache}{$comp_id}{comp};

    delete $self->{code_cache}{$comp_id};
    return;
}

sub comp_id_to_objfile {
    my ($self, $comp_id) = @_;

    return File::Spec->catfile
               ( $self->object_dir,
                 $self->compiler->object_id,
                 ( split /\//, $comp_id ),
               ) . $self->object_file_extension;
}

#
# Empty in-memory code cache.
#
sub flush_code_cache {
    my $self = shift;

    # Necessary for preventing memory leaks
    if ($self->use_internal_component_caches) {
        foreach my $entry (values %{$self->{code_cache}}) {
            my $comp = $entry->{comp};
            $comp->flush_internal_caches;
        }
    }
    $self->{code_cache} = {};
    $self->{source_cache} = {};
}

#
# If code cache has exceeded maximum, remove least frequently used
# elements from cache until size falls below minimum.
#
sub purge_code_cache {
    my ($self) = @_;

    return if $self->{unlimited_code_cache};
    my $current_size = scalar(keys(%{$self->{code_cache}}));
    if ($current_size > $self->code_cache_max_size) {
        my $code_cache = $self->{code_cache};
        my $min_size = $self->code_cache_min_size;
        my $decay_factor = 0.75;

        my @elems;
        while (my ($path,$href) = each(%{$code_cache})) {
            push(@elems,[$path,$href->{comp}->mfu_count,$href->{comp}]);
        }
        @elems = sort { $a->[1] <=> $b->[1] } @elems;
        while (($current_size > $min_size) and @elems) {
            $self->delete_from_code_cache(shift(@elems)->[0]);
            $current_size--;
        }

        #
        # Multiply each remaining cache item's count by a decay factor,
        # to gradually reduce impact of old information.
        #
        foreach my $elem (@elems) {
            $elem->[2]->mfu_count( $elem->[2]->mfu_count * $decay_factor );
        }
    }
}

#
# Clear the object directory of all current files and subdirectories.
# Do this by renaming the object directory to a temporary name,
# immediately recreating an empty object directory, then removing
# the empty object directory. If another process tries to write
# the object file in between these steps, it'll create the top
# object directory instead.
#
# Would be nice to fork off a separate process to do the removing so
# that it doesn't affect a request's response time, but difficult to
# do this in an environment-generic way.
#
sub remove_object_files
{
    my $self = shift;

    my $object_dir = $self->object_dir;
    if (-d $object_dir) {
        my $temp_dir = File::Temp::tempdir(DIR => $self->data_dir);
        rename($object_dir, File::Spec->catdir( $temp_dir, 'target' ) )
            or die "could not rename '$object_dir' to '$temp_dir': $@";
        $self->_make_object_dir();
        rmtree($temp_dir);
    } else {
        $self->_make_object_dir();
    }
}

#
# Check the static_source_touch_file, if one exists, to see if it has
# changed since we last checked. If it has, clear the code cache and
# object files if appropriate.
#
sub check_static_source_touch_file
{
    my $self = shift;

    if (my $touch_file = $self->static_source_touch_file) {
        return unless -f $touch_file;
        my $touch_file_lastmod = (stat($touch_file))[9];
        if ($touch_file_lastmod > $self->{static_source_touch_file_lastmod}) {

            # File has been touched since we last checked.  First,
            # clear the object file directory if the last mod of
            # its ._object_create_marker is earlier than the touch file,
            # or if the marker doesn't exist.
            #
            if ($self->use_object_files) {
                my $object_create_marker_file = $self->object_create_marker_file;
                if (!-e $object_create_marker_file ||
                    (stat($object_create_marker_file))[9] < $touch_file_lastmod) {
                    $self->remove_object_files;
                }
            }

            # Next, clear the in-memory component cache.
            #
            $self->flush_code_cache;

            # Reset lastmod value.
            #
            $self->{static_source_touch_file_lastmod} = $touch_file_lastmod;
        }
    }
}

#
# Construct a component on the fly.  Virtual if 'path' parameter is
# given, otherwise anonymous.
#
sub make_component {
    my $self = shift;

    my %p = validate(@_, { comp_source => { type => SCALAR, optional => 1 },
                           comp_file   => { type => SCALAR, optional => 1 },
                           name        => { type => SCALAR, optional => 1 } });

    $p{comp_source} = read_file(delete $p{comp_file}) if exists $p{comp_file};
    param_error "Must specify either 'comp_source' or 'comp_file' parameter to 'make_component()'"
        unless defined $p{comp_source};

    $p{name} ||= '';

    my $source = HTML::Mason::ComponentSource->new( friendly_name => $p{name},
                                                    comp_path => $p{name},
                                                    comp_id => undef,
                                                    last_modified => time,
                                                    comp_class => 'HTML::Mason::Component',
                                                    source_callback => sub { $p{comp_source} },
                                                  );

    my $object_code = $source->object_code( compiler => $self->compiler);

    my $comp = eval { $self->eval_object_code( object_code => $object_code ) };
    $self->_compilation_error( $p{name}, $@ ) if $@;

    $comp->assign_runtime_properties($self, $source);

    return $comp;
}

sub set_global
{
    my ($self, $decl, @values) = @_;
    param_error "Interp->set_global: expects a variable name and one or more values"
        unless @values;
    my ($prefix, $name) = ($decl =~ s/^([\$@%])//) ? ($1, $decl) : ('$', $decl);

    my $varname = sprintf("%s::%s",$self->compiler->in_package,$name);
    no strict 'refs';
    no warnings 'once';
    if ($prefix eq '$') {
        $$varname = $values[0];
    } elsif ($prefix eq '@') {
        @$varname = @values;
    } else {
        %$varname = @values;
    }
}

sub comp_root
{
    my $self = shift;

    if (my $new_comp_root = shift) {
        die "cannot assign new comp_root unless dynamic_comp_root parameter is set"
          unless $self->dynamic_comp_root;
        $self->_assign_comp_root($new_comp_root);
    }
    if (@{$self->{comp_root}} == 1 and $self->{comp_root}[0][0] eq 'MAIN') {
        return $self->{comp_root}[0][1];
    } else {
        return $self->{comp_root};
    }
}

sub comp_root_array
{
    return @{ $_[0]->{comp_root} };
}

sub _assign_comp_root
{
    my ($self, $new_comp_root) = @_;

    # Force into lol format.
    if (!ref($new_comp_root)) {
        $new_comp_root = [[ MAIN => $new_comp_root ]];
    } elsif (ref($new_comp_root) ne 'ARRAY') {
        die "Component root $new_comp_root must be a scalar or array reference";
    }

    # Validate key/path pairs, and check to see if any of them
    # conflict with old pairs.
    my $comp_root_key_map = $self->{comp_root_key_map} ||= {};
    foreach my $pair (@$new_comp_root) {
        param_error "Multiple-path component root must consist of a list of two-element lists"
          if ref($pair) ne 'ARRAY';
        param_error "Component root key '$pair->[0]' cannot contain slash"
          if $pair->[0] =~ /\//;
        $pair->[1] = File::Spec->canonpath( $pair->[1] );
        param_error "comp_root path '$pair->[1]' is not an absolute directory"
          unless File::Spec->file_name_is_absolute( $pair->[1] );

        my ($key, $path) = @$pair;
        if (my $orig_path = $comp_root_key_map->{$key}) {
            if ($path ne $orig_path) {
                die "comp_root key '$key' was originally associated with '$path', cannot change to '$orig_path'";
            }
        } else {
            $comp_root_key_map->{$key} = $path;
        }
    }
    $self->{comp_root} = $new_comp_root;
}

sub resolve_comp_path_to_source
{
    my ($self, $path) = @_;

    my $source;
    if ($self->{static_source}) {
        # Maintain a separate source_cache for each component root,
        # because the set of active component roots can change
        # from request to request.
        #
        my $source_cache = $self->{source_cache};
        foreach my $pair (@{$self->{comp_root}}) {
            my $source_cache_for_root = $source_cache->{$pair->[0]} ||= {};
            unless (exists($source_cache_for_root->{$path})) {
                $source_cache_for_root->{$path}
                  = $self->{resolver}->get_info($path, @$pair);
            }
            last if $source = $source_cache_for_root->{$path};
        }
    } else {
        my $resolver = $self->{resolver};
        foreach my $pair ($self->comp_root_array) {
            last if $source = $resolver->get_info($path, @$pair);
        }
    }
    return $source;
}

sub files_written
{
    my $self = shift;
    return @{$self->{files_written}};
}

#
# Push onto list of written files.
#
sub push_files_written
{
    my $self = shift;
    my $fref = $self->{'files_written'};
    push(@$fref,@_);
}

#
# Look for component <$name> starting in <$startpath> and moving upwards
# to the root. Return component object or undef.
#
sub find_comp_upwards
{
    my ($self, $startpath, $name) = @_;
    $startpath =~ s{/+$}{};

    # Don't use File::Spec here, this is a URL path.
    do {
      my $comp = $self->load("$startpath/$name");
      return $comp if $comp;
    } while $startpath =~ s{/+[^/]*$}{};

    return;  # Nothing found
}

###################################################################
# The eval_object_code & write_object_file methods used to be in
# Parser.pm.  This is a temporary home only.  They need to be moved
# again at some point in the future (during some sort of interp
# re-architecting).
###################################################################

#
# eval_object_code
#   (object_code, object_file, error)
# Evaluate an object file or object text.  Return a component object
# or undef if error.
#
# I think this belongs in the resolver (or comp loader) - Dave
#
sub eval_object_code
{
    my ($self, %p) = @_;

    #
    # Evaluate object file or text with warnings on, unless
    # ignore_warnings_expr is '.'.
    #
    my $ignore_expr = $self->ignore_warnings_expr;
    my ($comp, $err);
    my $warnstr = '';

    {
        local $^W = $ignore_expr eq '.' ? 0 : 1;
        local $SIG{__WARN__} =
            ( $ignore_expr ?
              ( $ignore_expr eq '.' ?
                sub { } :
                sub { $warnstr .= $_[0] if $_[0] !~ /$ignore_expr/ }
              ) :
              sub { $warnstr .= $_[0] } );

        $comp = $self->_do_or_eval(\%p);
    }

    $err = $warnstr . $@;

    #
    # Return component or error
    #
    if ($err) {
        # attempt to stem very long eval errors
        $err =~ s/has too many errors\..+/has too many errors./s;
        compilation_error $err;
    } else {
        return $comp;
    }
}

sub _do_or_eval
{
    my ($self, $p) = @_;

    if ($p->{object_file}) {
        return do $p->{object_file};
    } else {
        # If in taint mode, untaint the object text
        (${$p->{object_code}}) = ${$p->{object_code}} =~ /^(.*)/s if taint_is_on;

        return eval ${$p->{object_code}};
    }
}

sub _compilation_error {
    my ($self, $filename, $err) = @_;

    HTML::Mason::Exception::Compilation->throw(error=>$err, filename=>$filename);
}


sub object_file {
    my ($self, $comp) = @_;
    return $comp->persistent ?
        $self->comp_id_to_objfile($comp->comp_id) :
        undef;
}

sub use_autohandlers
{
    my $self = shift;
    return (defined $self->{autohandler_name} and length $self->{autohandler_name});
}

# Generate HTML that describes Interp's current status.
# This is used in things like Apache::Status reports.  Currently shows:
# -- Interp properties
# -- loaded (cached) components
sub status_as_html {
    my ($self, %p) = @_;

    # Should I be scared about this?  =)

    my $comp_source = <<'EOF';
Interpreter properties:

 Startup options:

 




883




 





 





 





 





 





 



 <%perl> 




884




 





 





 





 





 





 



 foreach my $property (sort keys %$interp) { 




885




 





 





 





 





 





 



     my $val = $interp->{$property}; 




886




 





 





 





 





 





 



   




887




 





 





 





 





 





 



     my $default = ( defined $val && defined $valid{$property}{default} && $val eq $valid{$property}{default} ) || ( ! defined $val && exists $valid{$property}{default} && ! defined $valid{$property}{default} ); 




888




 





 





 





 





 





 



   




889




 





 





 





 





 





 



     my $display = $val; 




890




 





 





 





 





 





 



     if (ref $val) { 




891




 





 





 





 





 





 



         $display = ''; 




892




 





 





 





 





 





 



         # only object can ->can, others die 




893




 





 





 





 





 





 



         my $is_object = eval { $val->can('anything'); 1 }; 




894




 





 





 





 





 





 



         if ($is_object) { 




895




 





 





 





 





 





 



             $display .= ref $val . ' object'; 




896




 





 





 





 





 





 



         } else { 




897




 





 





 





 





 





 



             if (UNIVERSAL::isa($val, 'ARRAY')) { 




898




 





 





 





 





 





 



                 $display .= 'ARRAY reference - [ '; 




899




 





 





 





 





 





 



                 $display .= join ', ', @$val; 




900




 





 





 





 





 





 



                 $display .= '] '; 




901




 





 





 





 





 





 



             } elsif (UNIVERSAL::isa($val, 'HASH')) { 




902




 





 





 





 





 





 



                 $display .= 'HASH reference - { '; 




903




 





 





 





 





 





 



                 my @pairs; 




904




 





 





 





 





 





 



                 while (my ($k, $v) = each %$val) { 




905




 





 





 





 





 





 



                    push @pairs, "$k => $v"; 




906




 





 





 





 





 





 



                 } 




907




 





 





 





 





 





 



                 $display .= join ', ', @pairs; 




908




 





 





 





 





 





 



                 $display .= ' }'; 




909




 





 





 





 





 





 



             } else { 




910




 





 





 





 





 





 



                 $display = ref $val . ' reference'; 




911




 





 





 





 





 





 



             } 




912




 





 





 





 





 





 



         } 




913




 





 





 





 





 





 



         $display .= ''; 




914




 





 





 





 





 





 



     } 




915




 





 





 





 





 





 



   




916




 





 





 





 





 





 



     defined $display && $display =~ s,([\x00-\x1F]),'control-' . chr( ord('A') + ord($1) - 1 ) . '',eg; # does this work for non-ASCII? 




917




 





 





 





 





 





 



  




918




 





 





 





 





 





 



   




919




 





 





 





 





 





 



    




920




 





 





 





 





 





 



     <% $property | h %> 




921




 





 





 





 





 





 



    




922




 





 





 





 





 





 



    




923




 





 





 





 





 





 



    <% defined $display ? $display : 'undef' %> 




924




 





 





 





 





 





 



    <% $default ? '(default)' : '' %> 




925




 





 





 





 





 





 



    




926




 





 





 





 





 





 



   




927




 





 





 





 





 





 



 % } 




928
<%perl>
foreach my $property (sort keys %$interp) {
    my $val = $interp->{$property};

    my $default = ( defined $val && defined $valid{$property}{default} && $val eq $valid{$property}{default} ) || ( ! defined $val && exists $valid{$property}{default} && ! defined $valid{$property}{default} );

    my $display = $val;
    if (ref $val) {
        $display = '';
        # only object can ->can, others die
        my $is_object = eval { $val->can('anything'); 1 };
        if ($is_object) {
            $display .= ref $val . ' object';
        } else {
            if (UNIVERSAL::isa($val, 'ARRAY')) {
                $display .= 'ARRAY reference - [ ';
                $display .= join ', ', @$val;
                $display .= '] ';
            } elsif (UNIVERSAL::isa($val, 'HASH')) {
                $display .= 'HASH reference - { ';
                my @pairs;
                while (my ($k, $v) = each %$val) {
                   push @pairs, "$k => $v";
                }
                $display .= join ', ', @pairs;
                $display .= ' }';
            } else {
                $display = ref $val . ' reference';
            }
        }
        $display .= '';
    }

    defined $display && $display =~ s,([\x00-\x1F]),'control-' . chr( ord('A') + ord($1) - 1 ) . '',eg; # does this work for non-ASCII?



    <% $property | h %>


   <% defined $display ? $display : 'undef' %>
   <% $default ? '(default)' : '' %>


% }



 Components in memory cache:

% my $cache;
% if ($cache = $interp->code_cache and %$cache) {
%   foreach my $key (sort keys %$cache) {
      <% $key |h%> (modified <% scalar localtime $cache->{$key}->{lastmod} %>)

%   }
% } else {
    None
% }



<%args>
 $interp   # The interpreter we'll elucidate
 %valid    # Default values for interp member data

EOF

    my $comp = $self->make_component(comp_source => $comp_source);
    my $out;

    my $args = [interp => $self, valid => $self->validation_spec];
    $self->make_request(comp=>$comp, args=>$args, out_method=>\$out, %p)->exec;

    return $out;
}

sub set_escape
{
    my $self = shift;
    my %p = @_;

    while ( my ($name, $sub) = each %p )
    {
        my $flag_regex = $self->compiler->lexer->escape_flag_regex;

        param_error "Invalid escape name ($name)"
            if $name !~ /^$flag_regex$/ || $name =~ /^n$/;

        my $coderef;
        if ( ref $sub )
        {
            $coderef = $sub;
        }
        else
        {
            if ( $sub =~ /^\w+$/ )
            {
                no strict 'refs';
                unless ( defined &{"HTML::Mason::Escapes::$sub"} )
                {
                    param_error "Invalid escape: $sub (no matching subroutine in HTML::Mason::Escapes";
                }

                $coderef = \&{"HTML::Mason::Escapes::$sub"};
            }
            else
            {
                $coderef = eval $sub;
                param_error "Invalid escape: $sub ($@)" if $@;
            }
        }

        $self->{escapes}{$name} = $coderef;
    }
}

sub remove_escape
{
    my $self = shift;

    delete $self->{escapes}{ shift() };
}

sub apply_escapes
{
    my $self = shift;
    my $text = shift;

    foreach my $flag (@_)
    {
        param_error "Invalid escape flag: $flag"
            unless exists $self->{escapes}{$flag};

        $self->{escapes}{$flag}->(\$text);
    }

    return $text;
}

1;

__END__