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=head1 NAME |
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PPIx::Regexp::Token::Quantifier - Represent an atomic quantifier. |
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=head1 SYNOPSIS |
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use PPIx::Regexp::Dumper; |
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PPIx::Regexp::Dumper->new( 'qr{\w+}smx' ) |
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->print(); |
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=head1 INHERITANCE |
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C is a |
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L. |
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C has no descendants. |
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=head1 DESCRIPTION |
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This class represents an atomic quantifier; that is, one of the |
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characters C<*>, C<+>, or C>. |
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B that if they occur inside a variable-length look-behind, C<'?'> |
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implies a minimum Perl version of C<5.29.9>, and C<'+'> and C<'*'> are |
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regarded as parse errors and reblessed into the unknown token. |
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=head1 METHODS |
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This class provides the following public methods. Methods not documented |
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here are private, and unsupported in the sense that the author reserves |
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the right to change or remove them without notice. |
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=cut |
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package PPIx::Regexp::Token::Quantifier; |
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use strict; |
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use warnings; |
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use base qw{ PPIx::Regexp::Token }; |
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use Carp; |
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use PPIx::Regexp::Constant qw{ |
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INFINITY |
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LITERAL_LEFT_CURLY_ALLOWED |
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MSG_LOOK_BEHIND_TOO_LONG |
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TOKEN_UNKNOWN |
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VARIABLE_LENGTH_LOOK_BEHIND_INTRODUCED |
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@CARP_NOT |
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}; |
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our $VERSION = '0.087'; |
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# Return true if the token can be quantified, and false otherwise |
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sub can_be_quantified { return }; |
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# Return true if the token is a quantifier. |
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sub is_quantifier { return 1 }; |
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my %quantifier = map { $_ => 1 } qw{ * + ? }; |
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=head2 could_be_quantifier |
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PPIx::Regexp::Token::Quantifier->could_be_quantifier( '*' ); |
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This method returns true if the given string could be a quantifier; that |
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is, if it is '*', '+', or '?'. |
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=cut |
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sub could_be_quantifier { |
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my ( undef, $string ) = @_; # Invocant unused |
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return $quantifier{$string}; |
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} |
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{ |
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my %explanation = ( |
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'*' => 'match zero or more times', |
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'+' => 'match one or more times', |
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'?' => 'match zero or one time', |
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); |
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sub __explanation { |
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return \%explanation; |
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} |
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} |
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sub __following_literal_left_curly_disallowed_in { |
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return LITERAL_LEFT_CURLY_ALLOWED; |
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} |
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{ |
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my $variable_look_behind_introduced = { |
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'*' => undef, |
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'+' => undef, |
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'?' => VARIABLE_LENGTH_LOOK_BEHIND_INTRODUCED, |
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}; |
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sub __PPIX_LEXER__finalize { |
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my ( $self ) = @_; |
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if ( $self->__in_look_behind() ) { |
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$self->{perl_version_introduced} = |
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$variable_look_behind_introduced->{$self->content()} |
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and return 0; |
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TOKEN_UNKNOWN->__PPIX_ELEM__rebless( $self, |
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error => MSG_LOOK_BEHIND_TOO_LONG, |
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); |
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return 1; |
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} |
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return 0; |
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} |
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} |
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{ |
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my %width = ( |
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'*' => [ 0, INFINITY ], |
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'+' => [ 1, INFINITY ], |
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'?' => [ 0, 1 ], |
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); |
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sub __quantified_width { |
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my ( $self, $raw_min, $raw_max ) = @_; |
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my $info = $width{$self->content()} |
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or croak sprintf q, |
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$self->content(); |
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my ( $my_min, $my_max ) = @{ $info }; |
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defined $raw_min |
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and $raw_min *= $my_min; |
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defined $raw_max |
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and $raw_max *= $my_max; |
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return ( $raw_min, $raw_max ); |
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} |
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} |
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sub __PPIX_TOKENIZER__regexp { |
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my ( undef, $tokenizer, $character ) = @_; |
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$tokenizer->prior_significant_token( 'can_be_quantified' ) |
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or return; |
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return $quantifier{$character}; |
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} |
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1; |
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__END__ |