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Perl::Critic::Policy::ValuesAndExpressions::ProhibitQuotesAsQuotelikeOperatorDelimiters

NAME

Perl::Critic::Policy::ValuesAndExpressions::ProhibitQuotesAsQuotelikeOperatorDelimiters − Don’t use quotes ("'", """, "`") as delimiters for the quote−like operators.

AFFILIATION

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

DESCRIPTION

With the obvious exception of using single-quotes to prevent interpolation, using quotes with the quote-like operators kind of defeats the purpose of them and produces obfuscated code, causing problems for future maintainers and their editors/IDEs.

    $x = q"q";                #not ok
    $x = q'q';                #not ok
    $x = q`q`;                #not ok
    $x = qq"q";               #not ok
    $x = qr"r";               #not ok
    $x = qw"w";               #not ok
    $x = qx`date`;            #not ok
    $x =~ m"m";               #not ok
    $x =~ s"s"x";             #not ok
    $x =~ tr"t"r";            #not ok
    $x =~ y"x"y";             #not ok
    $x =~ m'$x';              #ok
    $x =~ s'$x'y';            #ok
    $x = qr'$x'm;             #ok
    $x = qx'finger foo@bar';  #ok

CONFIGURATION

This policy has three options: "single_quote_allowed_operators", "double_quote_allowed_operators", and "back_quote_allowed_operators", which control which operators are allowed to use each of "'", """, "`" as delimiters, respectively.

The values allowed for these options are a whitespace delimited selection of the "m", "q", "qq", "qr", "qw", "qx", "s", "tr", and "y" operators.

By default, double quotes and back quotes (backticks) are not allowed as delimiters for any operators and single quotes are allowed as delimiters for the "m", "qr", "qx", and "s" operators. These defaults are equivalent to having the following in your .perlcriticrc:

    [ValuesAndExpressions::ProhibitQuotesAsQuotelikeOperatorDelimiters]
    single_quote_allowed_operators = m s qr qx
    double_quote_allowed_operators =
    back_quote_allowed_operators =

SUGGESTED BY

Michael Schwern

AUTHOR

Elliot Shank "<perl AT galumph DOT com>"

COPYRIGHT

Copyright (c) 2007−2011 Elliot Shank.

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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