NAME¶
Perl::Critic::Policy::ValuesAndExpressions::RequireInterpolationOfMetachars -
Warns that you might have used single quotes when you really wanted
double-quotes.
AFFILIATION¶
This Policy is part of the core Perl::Critic distribution.
DESCRIPTION¶
This policy warns you if you use single-quotes or "q//" with a string
that has unescaped metacharacters that may need interpolation. Its hard to
know for sure if a string really should be interpolated without looking into
the symbol table. This policy just makes an educated guess by looking for
metacharacters and sigils which usually indicate that the string should be
interpolated.
Exceptions¶
- •
- Variable names to "use vars":
use vars '$x'; # ok
use vars ('$y', '$z'); # ok
use vars qw< $a $b >; # ok
- •
- Things that look like e-mail addresses:
print 'john@foo.com'; # ok
$address = 'suzy.bar@baz.net'; # ok
CONFIGURATION¶
The "rcs_keywords" option allows you to stop this policy from
complaining about things that look like RCS variables, for example, in
deriving values for $VERSION variables.
For example, if you've got code like
our ($VERSION) = (q<$Revision: 4106 $> =~ m/(\d+)/mx);
You can specify
[ValuesAndExpressions::RequireInterpolationOfMetachars]
rcs_keywords = Revision
in your
.perlcriticrc to provide an exemption.
NOTES¶
Perl's own "warnings" pragma also warns you about this.
SEE ALSO¶
Perl::Critic::Policy::ValuesAndExpressions::ProhibitInterpolationOfLiterals
AUTHOR¶
Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>
COPYRIGHT¶
Copyright (c) 2005-2011 Imaginative Software Systems. 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.