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[dh-make-perl] / dev / i386 / libperl-critic-perl / libperl-critic-perl-1.088 / lib / Perl / Critic / Policy / Variables / ProhibitMatchVars.pm

diff --git a/dev/i386/libperl-critic-perl/libperl-critic-perl-1.088/lib/Perl/Critic/Policy/Variables/ProhibitMatchVars.pm b/dev/i386/libperl-critic-perl/libperl-critic-perl-1.088/lib/Perl/Critic/Policy/Variables/ProhibitMatchVars.pm
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+++ b/dev/i386/libperl-critic-perl/libperl-critic-perl-1.088/lib/Perl/Critic/Policy/Variables/ProhibitMatchVars.pm
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+##############################################################################
+#      $URL: http://perlcritic.tigris.org/svn/perlcritic/trunk/Perl-Critic/lib/Perl/Critic/Policy/Variables/ProhibitMatchVars.pm $
+#     $Date: 2008-07-03 10:19:10 -0500 (Thu, 03 Jul 2008) $
+#   $Author: clonezone $
+# $Revision: 2489 $
+##############################################################################
+
+package Perl::Critic::Policy::Variables::ProhibitMatchVars;
+
+use 5.006001;
+use strict;
+use warnings;
+use Readonly;
+
+use Perl::Critic::Utils qw{ :severities :data_conversion };
+use base 'Perl::Critic::Policy';
+
+our $VERSION = '1.088';
+
+#-----------------------------------------------------------------------------
+
+Readonly::Scalar my $DESC => q{Match variable used};
+Readonly::Scalar my $EXPL => [ 82 ];
+
+Readonly::Array my @FORBIDDEN => qw( $` $& $' $MATCH $PREMATCH $POSTMATCH );
+Readonly::Hash my %FORBIDDEN => hashify( @FORBIDDEN );
+
+#-----------------------------------------------------------------------------
+
+sub supported_parameters { return ()                  }
+sub default_severity     { return $SEVERITY_HIGH      }
+sub default_themes       { return qw( core bugs pbp ) }
+sub applies_to           { return qw( PPI::Token::Symbol
+                                      PPI::Statement::Include ) }
+
+#-----------------------------------------------------------------------------
+
+sub violates {
+    my ( $self, $elem, undef ) = @_;
+    if (_is_use_english($elem) || _is_forbidden_var($elem)) {
+        return $self->violation( $DESC, $EXPL, $elem );
+    }
+    return;  #ok!
+}
+
+#-----------------------------------------------------------------------------
+
+sub _is_use_english {
+    my $elem = shift;
+    $elem->isa('PPI::Statement::Include') || return;
+    $elem->type() eq 'use' || return;
+    $elem->module() eq 'English' || return;
+
+    # Bare, lacking -no_match_vars.  Now handled by
+    # Modules::RequireNoMatchVarsWithUseEnglish.
+    return 0 if ($elem =~ m/\A use \s+ English \s* ;\z/xms);
+
+    return 1 if ($elem =~ m/\$(?:PRE|POST|)MATCH/xms);
+    return;  # either "-no_match_vars" or a specific list
+}
+
+sub _is_forbidden_var {
+    my $elem = shift;
+    $elem->isa('PPI::Token::Symbol') || return;
+    return exists $FORBIDDEN{$elem};
+}
+
+1;
+
+__END__
+
+#-----------------------------------------------------------------------------
+
+=pod
+
+=head1 NAME
+
+Perl::Critic::Policy::Variables::ProhibitMatchVars - Avoid C<$`>, C<$&>, C<$'> and their English equivalents.
+
+=head1 AFFILIATION
+
+This Policy is part of the core L<Perl::Critic> distribution.
+
+
+=head1 DESCRIPTION
+
+Using the "match variables" C<$`>, C<$&>, and/or C<$'> can
+significantly degrade the performance of a program.  This policy
+forbids using them or their English equivalents.  See B<perldoc
+English> or PBP page 82 for more information.
+
+It used to forbid plain C<use English;> because it ends up causing the
+performance side-effects of the match variables.  However, the message
+emitted for that situation was not at all clear and there is now
+L<Perl::Critic::Policy::Modules::RequireNoMatchVarsWithUseEnglish>,
+which addresses this situation directly.
+
+
+=head1 CONFIGURATION
+
+This Policy is not configurable except for the standard options.
+
+
+=head1 AUTHOR
+
+Chris Dolan <cdolan@cpan.org>
+
+=head1 COPYRIGHT
+
+Copyright (c) 2006-2008 Chris Dolan.  All rights reserved.
+
+This program is free software; you can redistribute it and/or modify
+it under the same terms as Perl itself.  The full text of this license
+can be found in the LICENSE file included with this module.
+
+=cut
+
+# Local Variables:
+#   mode: cperl
+#   cperl-indent-level: 4
+#   fill-column: 78
+#   indent-tabs-mode: nil
+#   c-indentation-style: bsd
+# End:
+# ex: set ts=8 sts=4 sw=4 tw=78 ft=perl expandtab shiftround :