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package Perl::Critic::Policy::ControlStructures::ProhibitDeepNests; |
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use 5.010001; |
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use strict; |
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use warnings; |
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use Readonly; |
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use Perl::Critic::Utils qw{ :severities }; |
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use parent 'Perl::Critic::Policy'; |
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our $VERSION = '1.148'; |
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#----------------------------------------------------------------------------- |
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Readonly::Scalar my $DESC => q{Code structure is deeply nested}; |
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Readonly::Scalar my $EXPL => q{Consider refactoring}; |
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#----------------------------------------------------------------------------- |
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sub supported_parameters { |
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return ( |
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{ |
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name => 'max_nests', |
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description => 'The maximum number of nested constructs to allow.', |
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default_string => '5', |
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behavior => 'integer', |
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integer_minimum => 1, |
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}, |
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); |
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} |
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sub default_severity { return $SEVERITY_MEDIUM } |
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sub default_themes { return qw(core maintenance complexity) } |
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sub applies_to { return 'PPI::Statement::Compound' } |
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#----------------------------------------------------------------------------- |
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sub violates { |
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my ( $self, $elem, undef ) = @_; |
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my $nest_count = 1; #For _this_ element |
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my $parent = $elem; |
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while ( $parent = $parent->parent() ){ |
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if( $parent->isa('PPI::Statement::Compound') ) { |
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$nest_count++; |
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} |
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} |
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if ( $nest_count > $self->{_max_nests} ) { |
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return $self->violation( $DESC, $EXPL, $elem ); |
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} |
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return; #ok! |
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} |
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1; |
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__END__ |
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#----------------------------------------------------------------------------- |
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=pod |
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=for stopwords refactored |
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=head1 NAME |
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Perl::Critic::Policy::ControlStructures::ProhibitDeepNests - Don't write deeply nested loops and conditionals. |
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=head1 AFFILIATION |
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This Policy is part of the core L<Perl::Critic|Perl::Critic> |
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distribution. |
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=head1 DESCRIPTION |
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Deeply nested code is often hard to understand and may be a sign that |
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it needs to be refactored. There are several good books on how to |
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refactor code. I like Martin Fowler's "Refactoring: Improving The |
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Design of Existing Code". |
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=head1 CONFIGURATION |
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The maximum number of nested control structures can be configured via |
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a value for C<max_nests> in a F<.perlcriticrc> file. Each for-loop, |
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if-else, while, and until block is counted as one nest. Postfix forms |
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of these constructs are not counted. The default maximum is 5. |
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Customization in a F<.perlcriticrc> file looks like this: |
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[ControlStructures::ProhibitDeepNests] |
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max_nests = 3 |
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=head1 AUTHOR |
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Jeffrey Ryan Thalhammer <jeff@imaginative-software.com> |
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=head1 COPYRIGHT |
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Copyright (c) 2005-2011 Imaginative Software Systems. All rights reserved. |
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This program is free software; you can redistribute it and/or modify |
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it under the same terms as Perl itself. The full text of this license |
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can be found in the LICENSE file included with this module. |
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=cut |
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# Local Variables: |
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# mode: cperl |
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# cperl-indent-level: 4 |
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# fill-column: 78 |
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# indent-tabs-mode: nil |
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# c-indentation-style: bsd |
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# End: |
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# ex: set ts=8 sts=4 sw=4 tw=78 ft=perl expandtab shiftround : |