NAME

       PPIx::Regexp::Token::GroupType - Represent a grouping parenthesis type.

SYNOPSIS

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

INHERITANCE

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

       "PPIx::Regexp::Token::GroupType" is the parent of
       PPIx::Regexp::Token::GroupType::Assertion,
       PPIx::Regexp::Token::GroupType::Atomic_Script_Run,
       PPIx::Regexp::Token::GroupType::BranchReset, PPIx::Regexp::Token::GroupType::Code,
       PPIx::Regexp::Token::GroupType::Modifier, PPIx::Regexp::Token::GroupType::NamedCapture,
       PPIx::Regexp::Token::GroupType::Script_Run, PPIx::Regexp::Token::GroupType::Subexpression
       and PPIx::Regexp::Token::GroupType::Switch.

DESCRIPTION

       This class represents any of the magic sequences of characters that can follow an open
       parenthesis. This particular class is intended to be abstract.

METHODS

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

   __defining_string
        my $string = $class->__defining_string();

       This method is private to the "PPIx-Regexp" package, and is documented for the author's
       benefit only. It may be changed or revoked without notice.

       This method returns an array of strings that define the specific group type.  These
       strings will normally start with '?'.

       Optionally, the first returned item may be a hash reference. The only supported key is
       "{suffix}", which is a string to be suffixed to each of the regular expressions made by
       "__make_group_type_matcher()" out of the defining strings, inside a "(?= ... )", so that
       it is not included in the match.

       This method must be overridden, unless "__make_group_type_matcher()" is. The override must
       return the same thing each time, since the results of "__make_group_type_matcher()" are
       cached.

   __make_group_type_matcher
        my $hash_ref = $class->__make_group_type_matcher();

       This method is private to the "PPIx-Regexp" package, and is documented for the author's
       benefit only. It may be changed or revoked without notice.

       This method returns a reference to a hash. The keys are regexp delimiter characters which
       appear in the defining strings for the group type. For each key, the value is a reference
       to an array of "Regexp" objects, properly escaped for the key character. Key '' provides
       the regular expressions to be used if the regexp delimiter does not appear in any of the
       defining strings.

       If this method is overridden by the subclass, method "__defining_string()" need not be,
       unless the overridden "__make_group_type_matcher()" calls "__defining_string()".

   __match_setup
        $class->__match_setup( $tokenizer );

       This method is private to the "PPIx-Regexp" package, and is documented for the author's
       benefit only. It may be changed or revoked without notice.

       This method performs whatever setup is needed once it is determined that the given group
       type has been detected.  This method is called only if the class matched at the current
       position in the string being parsed. It must perform whatever extra setup is needed for
       the match. It returns nothing.

       This method need not be overridden. The default does nothing.

   __setup_class
        $class->__setup_class( \%definition, \%opt );

       This method is private to the "PPIx-Regexp" package, and is documented for the author's
       benefit only. It may be changed or revoked without notice.

       This method uses the %definition hash to create the "__defining_string()", "explain()",
       "perl_version_introduced()", and "perl_version_removed()" methods for the calling class.
       Any of these that already exist will not be replaced.

       The %definition hash defines all the strings that specify tokens of the invoking class.
       You can not (unfortunately) use this mechanism if you need a regular expression to
       recognize a token that belongs to this class. The keys of the %definition hash are strings
       that specify members of this class. The values are hashes that define the specific member
       of the class. The following values are supported:

       {expl}
           This is the explanation of the element, to be returned by the "explain()" method.

       {intro}
           This is the Perl version that introduced the element, as a string. The default is the
           value of constant MINIMUM_PERL.

       {remov}
           This is the Perl version that removed the element, as a string. The default is
           "undef", meaning that the element is still present in the highest released version of
           Perl, whether development or production.

       The %opt hash is optional, and defaults to the empty hash. It is used, basically, for ad-
       hocery. The supported keys are:

       {suffix}
           If this element is defined, the first element returned by the generated
           __defining_string() method is a hash containing this key and value.

SUPPORT

       Support is by the author. Please file bug reports at
       <https://rt.cpan.org/Public/Dist/Display.html?Name=PPIx-Regexp>,
       <https://github.com/trwyant/perl-PPIx-Regexp/issues>, or in electronic mail to the author.

AUTHOR

       Thomas R. Wyant, III wyant at cpan dot org

COPYRIGHT AND LICENSE

       Copyright (C) 2009-2022 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.