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Manual Reference Pages  -  PERL::CRITIC::POLICY::MODULES::PROHIBITCONDITIONALUSESTATEMENTS (3)

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NAME

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

CONTENTS

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.

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perl v5.20.3 PERL::CRITIC::POLICY::MODULES::PROHIBITCONDITIONALUSESTATEMENTS (3) 2016-04-03

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