PPIx::Regexp::Token::GroupType::Code - Represent one of the embedded code indicators

PPIx-Regexp documentation Contained in the PPIx-Regexp distribution.

Index

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NAME

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PPIx::Regexp::Token::GroupType::Code - Represent one of the embedded code indicators

SYNOPSIS

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 use PPIx::Regexp::Dumper;
 PPIx::Regexp::Dumper->new( 'qr{(?{print "hello world!\n")}smx' )
     ->print();

INHERITANCE

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PPIx::Regexp::Token::GroupType::Code is a PPIx::Regexp::Token::GroupType.

PPIx::Regexp::Token::GroupType::Code has no descendants.

DESCRIPTION

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This method represents one of the embedded code indicators, either '?' or '??', in the zero-width assertion

 (?{ print "Hello, world!\n" })

or the old-style deferred expression syntax

 my $foo;
 $foo = qr{ foo (??{ $foo }) }smx;

METHODS

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

SUPPORT

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Support is by the author. Please file bug reports at http://rt.cpan.org, or in electronic mail to the author.

AUTHOR

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Thomas R. Wyant, III wyant at cpan dot org

COPYRIGHT AND LICENSE

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Copyright (C) 2009-2011 by Thomas R. Wyant, III

This program is free software; you can redistribute it and/or modify it under the same terms as Perl 5.10.0. For more details, see the full text of the licenses in the directory LICENSES.

This program is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose.

PPIx-Regexp documentation Contained in the PPIx-Regexp distribution. 
package PPIx::Regexp::Token::GroupType::Code;

use strict;
use warnings;

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

use PPIx::Regexp::Constant qw{ MINIMUM_PERL };

our $VERSION = '0.020';

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

{
    my %perl_version_introduced = (
	'?'	=> '5.005',
	'?p'	=> '5.005',	# Presumed. I can find no documentation.
	'??'	=> '5.006',
    );

    sub perl_version_introduced {
	my ( $self ) = @_;
	return $perl_version_introduced{ $self->content() } || '5.005';
    }

}

{

    my %perl_version_removed = (
	'?p'	=> '5.009005',
    );

    sub perl_version_removed {
	my ( $self ) = @_;
	return $perl_version_removed{ $self->content() };
    }
}

sub __PPIX_TOKENIZER__regexp {
    my ( $class, $tokenizer, $character ) = @_;

    # Recognize '?{', '??{', or '?p{', the latter deprecated in Perl
    # 5.6, and removed in 5.10. The extra escapes are because the
    # non-open-bracket characters may appear as delimiters to the
    # expression.
    if ( my $accept = $tokenizer->find_regexp(
	    qr{ \A \\? \? \\? [?p]? \{ }smx ) ) {

	--$accept;	# Don't want the curly bracket.

	# Code token comes after.
	$tokenizer->expect( 'PPIx::Regexp::Token::Code' );

	return $accept;
    }

    return;
}

1;

__END__


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