/usr/share/perl5/PPI/Token/_QuoteEngine.pm is in libppi-perl 1.220-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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=pod
=head1 NAME
PPI::Token::_QuoteEngine - The PPI Quote Engine
=head1 DESCRIPTION
The C<PPI::Token::_QuoteEngine> package is designed hold functionality
for processing quotes and quote like operators, including regexes.
These have special requirements in parsing.
The C<PPI::Token::_QuoteEngine> package itself provides various parsing
methods, which the L<PPI::Token::Quote>, L<PPI::Token::QuoteLike> and
L<PPI::Token::Regexp> can inherit from. In this sense, it serves
as a base class.
=head2 Using this class
I<(Refers only to internal uses. This class does not provide a
public interface)>
To use these, you should initialize them as normal C<'$Class-E<gt>new'>,
and then call the 'fill' method, which will cause the specialised
parser to scan forwards and parse the quote to its end point.
If -E<gt>fill returns true, finalise the token.
=cut
use strict;
use Carp ();
use vars qw{$VERSION};
BEGIN {
$VERSION = '1.220';
}
# Hook for the __TOKENIZER__on_char token call
sub __TOKENIZER__on_char {
my $class = shift;
my $t = $_[0]->{token} ? shift : return undef;
# Call the fill method to process the quote
my $rv = $t->{token}->_fill( $t );
return undef unless defined $rv;
## Doesn't support "end of file" indicator
# Finalize the token and return 0 to tell the tokenizer
# to go to the next character.
$t->_finalize_token;
0;
}
#####################################################################
# Optimised character processors, used for quotes
# and quote like stuff, and accessible to the child classes
# An outright scan, raw and fast.
# Searches for a particular character, not escaped, loading in new
# lines as needed.
# When called, we start at the current position.
# When leaving, the position should be set to the position
# of the character, NOT the one after it.
sub _scan_for_unescaped_character {
my $class = shift;
my $t = shift;
my $char = (length $_[0] == 1) ? quotemeta shift : return undef;
# Create the search regex.
# Same as above but with a negative look-behind assertion.
my $search = qr/(.*?(?<!\\)(?:\\\\)*$char)/;
my $string = '';
while ( exists $t->{line} ) {
# Get the search area for the current line
pos $t->{line} = $t->{line_cursor};
# Can we find a match on this line
if ( $t->{line} =~ m/\G$search/gc ) {
# Found the character on this line
$t->{line_cursor} += length($1) - 1;
return $string . $1;
}
# Load in the next line
$string .= substr $t->{line}, $t->{line_cursor};
my $rv = $t->_fill_line('inscan');
if ( $rv ) {
# Push to first character
$t->{line_cursor} = 0;
} elsif ( defined $rv ) {
# We hit the End of File
return \$string;
} else {
# Unexpected error
return undef;
}
}
# We shouldn't be able to get here
return undef;
}
# Scan for a close braced, and take into account both escaping,
# and open close bracket pairs in the string. When complete, the
# method leaves the line cursor on the LAST character found.
sub _scan_for_brace_character {
my $class = shift;
my $t = shift;
my $close_brace = $_[0] =~ /^(?:\>|\)|\}|\])$/ ? shift : Carp::confess(''); # return undef;
my $open_brace = $close_brace;
$open_brace =~ tr/\>\)\}\]/\<\(\{\[/;
# Create the search string
$close_brace = quotemeta $close_brace;
$open_brace = quotemeta $open_brace;
my $search = qr/\G(.*?(?<!\\)(?:\\\\)*(?:$open_brace|$close_brace))/;
# Loop as long as we can get new lines
my $string = '';
my $depth = 1;
while ( exists $t->{line} ) {
# Get the search area
pos $t->{line} = $t->{line_cursor};
# Look for a match
unless ( $t->{line} =~ /$search/gc ) {
# Load in the next line
$string .= substr( $t->{line}, $t->{line_cursor} );
my $rv = $t->_fill_line('inscan');
if ( $rv ) {
# Push to first character
$t->{line_cursor} = 0;
next;
}
if ( defined $rv ) {
# We hit the End of File
return \$string;
}
# Unexpected error
return undef;
}
# Add to the string
$string .= $1;
$t->{line_cursor} += length $1;
# Alter the depth and continue if we aren't at the end
$depth += ($1 =~ /$open_brace$/) ? 1 : -1 and next;
# Rewind the cursor by one character ( cludgy hack )
$t->{line_cursor} -= 1;
return $string;
}
# Returning the string as a reference indicates EOF
\$string;
}
# Find all spaces and comments, up to, but not including
# the first non-whitespace character.
#
# Although it doesn't return it, it leaves the cursor
# on the character following the gap
sub _scan_quote_like_operator_gap {
my $t = $_[1];
my $string = '';
while ( exists $t->{line} ) {
# Get the search area for the current line
pos $t->{line} = $t->{line_cursor};
# Since this regex can match zero characters, it should always match
$t->{line} =~ /\G(\s*(?:\#.*)?)/gc or return undef;
# Add the chars found to the string
$string .= $1;
# Did we match the entire line?
unless ( $t->{line_cursor} + length $1 == length $t->{line} ) {
# Partial line match, which means we are at
# the end of the gap. Fix the cursor and return
# the string.
$t->{line_cursor} += length $1;
return $string;
}
# Load in the next line.
# If we reach the EOF, $t->{line} gets deleted,
# which is caught by the while.
my $rv = $t->_fill_line('inscan');
if ( $rv ) {
# Set the cursor to the first character
$t->{line_cursor} = 0;
} elsif ( defined $rv ) {
# Returning the string as a reference indicates EOF
return \$string;
} else {
return undef;
}
}
# Shouldn't be able to get here
return undef;
}
1;
=pod
=head1 SUPPORT
See the L<support section|PPI/SUPPORT> in the main module.
=head1 AUTHOR
Adam Kennedy E<lt>adamk@cpan.orgE<gt>
=head1 COPYRIGHT
Copyright 2001 - 2011 Adam Kennedy.
This program is free software; you can redistribute
it and/or modify it under the same terms as Perl itself.
The full text of the license can be found in the
LICENSE file included with this module.
=cut
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