/ 
Perl-Critic-1.156
River stage three • 132 direct dependents • 384 total dependents
/ Perl::Critic::Policy::Modules::ProhibitConditionalUseStatements

NAME

Perl::Critic::Policy::Modules::ProhibitConditionalUseStatements - Avoid putting conditional logic around compile-time includes.

AFFILIATION

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

DESCRIPTION

Modules included via "use" are loaded at compile-time. Placing conditional logic around the "use" statement has no effect on whether the module will be loaded. Doing so can also serve to confuse the reader as to the author's original intent.

If you need to conditionally load a module you should be using "require" instead.

This policy will catch the following forms of conditional "use" statements:

# if-elsif-else
if ($a == 1) { use Module; }
if ($a == 1) { } elsif ($a == 2) { use Module; }
if ($a == 1) { } else { use Module; }

# for/foreach
for (1..$a) { use Module; }
foreach (@a) { use Module; }

# while
while ($a == 1) { use Module; }

# unless
unless ($a == 1) { use Module; }

# until
until ($a == 1) { use Module; }

# do-condition
do { use Module; } if $a == 1;
do { use Module; } while $a == 1;
do { use Module; } unless $a == 1;
do { use Module; } until $a == 1;

# operator-do
$a == 1 || do { use Module; };
$a == 1 && do { use Module; };
$a == 1 or do { use Module; };
$a == 1 and do { use Module; };

# non-string eval
eval { use Module; };

Including a module via "use" in bare blocks, standalone do blocks, or string evals is allowed.

# bare block
{ use Module; }

# do
do { use Module; }

# string eval
eval "use Module";

CONFIGURATION

This Policy is not configurable except for the standard options.

AUTHOR

Peter Guzis <pguzis@cpan.org>

COPYRIGHT

Copyright (c) 2010-2011 Peter Guzis. 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.