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Manual Reference Pages  -  PERL::CRITIC::POLICY::BUILTINFUNCTIONS::PROHIBITSTRINGYEVAL (3)

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NAME

Perl::Critic::Policy::BuiltinFunctions::ProhibitStringyEval - Write "eval { my $foo; bar($foo) }" instead of "eval "my $foo; bar($foo);"".

CONTENTS

AFFILIATION

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

DESCRIPTION

The string form of eval is recompiled every time it is executed, whereas the block form is only compiled once. Also, the string form doesn’t give compile-time warnings.



    eval "print $foo";        # not ok
    eval {print $foo};        # ok



CONFIGURATION

There is an allow_includes boolean option for this Policy. If set, then strings that look like they only include a single use or require statement (with the possible following statement that consists of a single number) are allowed. With this option set, the following are flagged as indicated:



    eval use Foo;             # ok
    eval require Foo;         # ok
    eval "use $thingy;";        # ok
    eval "require $thingy;";    # ok
    eval "use $thingy; 1;";     # ok
    eval "require $thingy; 1;"; # ok

    eval use Foo; blah;;      # still not ok
    eval require Foo; 2; 1;;  # still not ok
    eval use $thingy;;        # still not ok
    eval no Foo;              # still not ok



If you don’t understand why the number is allowed, see Perl::Critic::Policy::ErrorHandling::RequireCheckingReturnValueOfEval.

This option inspired by Ricardo SIGNESPerl::Critic::Policy::Lax::ProhibitStringyEval::ExceptForRequire.

SEE ALSO

Perl::Critic::Policy::ControlStrucutres::RequireBlockGrep

Perl::Critic::Policy::ControlStrucutres::RequireBlockMap

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.

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perl v5.20.3 PERL::CRITIC::POLICY::BUILTINFUNCTIONS::PROHIBITSTRINGYEVAL (3) 2016-04-03

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