File Coverage

blib/lib/PPIx/Regexp/Token/Condition.pm

Criterion	Covered	Total	%
statement	32	32	100.0
branch	12	12	100.0
condition			n/a
subroutine	8	8	100.0
pod	2	2	100.0
total	54	54	100.0

=head1 NAME

PPIx::Regexp::Token::Condition - Represent the condition of a switch

=head1 SYNOPSIS

 use PPIx::Regexp::Dumper;
 PPIx::Regexp::Dumper->new( 'qr{(?(1)foo|bar)}smx' )
     ->print();

=head1 INHERITANCE

C is a
L.

C has no descendants.

=head1 DESCRIPTION

This class represents the condition portion of a switch or conditional
expression, provided that condition is reasonably represented as a
token.

=head1 METHODS

This class provides no public methods beyond those provided by its
superclass.

=cut

package PPIx::Regexp::Token::Condition;

use strict;
use warnings;

use base qw{ PPIx::Regexp::Token::Reference };

use PPIx::Regexp::Constant qw{ RE_CAPTURE_NAME @CARP_NOT };

our $VERSION = '0.087';

{

    my %explanation = (
	'(DEFINE)'	=> 'Define a group to be recursed into',
	'(R)'	=> 'True if recursing',
    );

    sub explain {
	my ( $self ) = @_;
	my $content = $self->content();
	if ( defined( my $expl = $explanation{$content} ) ) {
	    return $expl;
	}
	if ( $content =~ m/ \A [(] R /smx ) {	# )
	    $self->is_named()
		and return sprintf
		q,
		$self->name();
	    return sprintf
		q,
		$self->absolute();
	}
	$self->is_named()
	    and return sprintf
	    q,
	    $self->name();
	return sprintf
	    q,
	    $self->absolute();
    }

}

sub perl_version_introduced {
    my ( $self ) = @_;
    $self->content() =~ m/ \A [(] [0-9]+ [)] \z /smx
	and return '5.005';
    return '5.009005';
}

my @recognize = (
    [ qr{ \A \( (?: ( [0-9]+ ) | R ( [0-9]+ ) ) \) }smx,
	{ is_named => 0 } ],
    [ qr{ \A \( R \) }smx,
	{ is_named => 0, capture => '0' } ],
    [ qr{ \A \( (?: < ( @{[ RE_CAPTURE_NAME ]} ) > |
	    ' ( @{[ RE_CAPTURE_NAME ]} ) ' |
	    R & ( @{[ RE_CAPTURE_NAME ]} ) ) \) }smxo,
	{ is_named => 1} ],
    [ qr{ \A \( DEFINE \) }smx,
	{ is_named => 0, capture => '0' } ],
);

# This must be implemented by tokens which do not recognize themselves.
# The return is a list of list references. Each list reference must
# contain a regular expression that recognizes the token, and optionally
# a reference to a hash to pass to make_token as the class-specific
# arguments. The regular expression MUST be anchored to the beginning of
# the string.
sub __PPIX_TOKEN__recognize {
    return @recognize;
}

# Return true if the token can be quantified, and false otherwise
# sub can_be_quantified { return };

sub __PPIX_TOKENIZER__regexp {
    my ( undef, $tokenizer ) = @_;	# Invocant, $character unused

    foreach ( @recognize ) {
	my ( $re, $arg ) = @{ $_ };
	my $accept = $tokenizer->find_regexp( $re ) or next;
	return $tokenizer->make_token( $accept, __PACKAGE__, $arg );
    }

    return;
}

1;

__END__