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Perl::Critic::Policy::Variables::ProhibitPunctuationVars.3pm

NAME

Perl::Critic::Policy::Variables::ProhibitPunctuationVars - Write $EVAL_ERROR instead of $@.

AFFILIATION

This Policy is part of the core Perl::Critic distribution.

DESCRIPTION

Perl's vocabulary of punctuation variables such as $!, $., and $^ are perhaps the leading cause of its reputation as inscrutable line noise. The simple alternative is to use the English module to give them clear names.

   $| = undef;                      #not ok
 
   use English qw(-no_match_vars);
   local $OUTPUT_AUTOFLUSH = undef;        #ok
 
 

CONFIGURATION

The scratch variables $_ and @_ are very common and are pretty well understood, so they are exempt from this policy. The same goes for the less-frequently-used default filehandle "_" used by stat(). All the regexp capture variables ($1, $2, ...) are exempt too.

You can add more exceptions to your configuration. In your perlcriticrc file, add a block like this:

   [Variables::ProhibitPunctuationVars]
   allow = $@ $!
 
 

The "allow" property should be a whitespace-delimited list of punctuation variables.

BUGS

This doesn't find punctuation variables in strings. RT #35970.

AUTHOR

Jeffrey Ryan Thalhammer <thaljef@cpan.org>

COPYRIGHT

Copyright (c) 2005-2009 Jeffrey Ryan Thalhammer. 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.