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package Perl::Critic::Policy::Catalyst::ProhibitUnreachableCode; |
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our $VERSION = '0.02'; |
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399745
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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 :data_conversion :classification }; |
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use base 'Perl::Critic::Policy'; |
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Readonly::Array my @CONDITIONALS => qw( if unless foreach while until for ); |
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Readonly::Hash my %CONDITIONALS => hashify( @CONDITIONALS ); |
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Readonly::Array my @OPERATORS => qw( && || // and or err ? ); |
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Readonly::Hash my %OPERATORS => hashify( @OPERATORS ); |
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Readonly::Scalar my $DESC => q{Unreachable code}; |
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Readonly::Scalar my $EXPL => q{Consider removing it}; |
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sub supported_parameters { |
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return( |
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{ |
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name => 'context_methods', |
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description => 'Catalyst context methods which terminate execution', |
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behavior => 'string list', |
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default_string => '', |
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list_always_present_values => |
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[qw( detach redirect_and_detach )], |
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}, |
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{ |
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name => 'controller_methods', |
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description => 'Catalyst controller methods which terminate execution', |
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behavior => 'string list', |
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default_string => '', |
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}, |
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); |
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} |
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3
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1
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sub default_severity { $SEVERITY_HIGH } |
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0
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0
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1
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0
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sub default_themes { qw( core bugs certrec catalyst ) } |
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6
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1
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42007
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sub applies_to { 'PPI::Token::Word' } |
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44
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sub violates { |
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1
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1140
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my ($self, $element) = @_; |
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47
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46
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100
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119
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return if !is_method_call( $element ); |
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49
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16
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753
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my $statement = $element->statement(); |
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252
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return if !$statement; |
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52
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16
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34
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my @context_methods = keys %{ $self->{_context_methods} }; |
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63
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53
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16
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36
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my @controller_methods = keys %{ $self->{_controller_methods} }; |
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47
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54
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55
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return unless ( |
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100
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100
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82
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_is_terminating_context_method( $element, \@context_methods ) or |
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_is_terminating_controller_method( $element, \@controller_methods ) |
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); |
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60
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12
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45
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for my $child ( $statement->schildren() ) { |
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50
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66
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447
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return if $child->isa('PPI::Token::Operator') && exists $OPERATORS{$child}; |
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48
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100
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100
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422
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return if $child->isa('PPI::Token::Word') && exists $CONDITIONALS{$child}; |
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} |
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65
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10
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36
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return $self->_gather_violations($statement); |
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} |
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68
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sub _is_terminating_context_method { |
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16
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16
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39
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my ($element, $methods) = @_; |
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71
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16
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29
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my $found_method = 0; |
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16
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40
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foreach my $method (@$methods) { |
73
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32
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100
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283
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next if $element ne $method; |
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10
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160
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$found_method = 1; |
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10
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32
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last; |
76
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} |
77
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16
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100
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134
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return 0 if !$found_method; |
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79
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10
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32
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my $prev = $element->sprevious_sibling(); |
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10
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50
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225
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return 0 if !$prev; |
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10
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50
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27
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return 0 if $prev ne '->'; |
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10
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50
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164
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return 0 if !$prev->isa('PPI::Token::Operator'); |
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84
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10
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30
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$prev = $prev->sprevious_sibling(); |
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10
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50
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214
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return 0 if !$prev; |
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10
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50
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29
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return 0 if $prev ne '$c'; |
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10
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50
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159
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return 0 if !$prev->isa('PPI::Token::Symbol'); |
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89
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10
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35
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return 1; |
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} |
91
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92
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sub _is_terminating_controller_method { |
93
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6
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6
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20
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my ($element, $methods) = @_; |
94
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95
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6
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13
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my $found_method = 0; |
96
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6
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15
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foreach my $method (@$methods) { |
97
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3
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50
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9
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next if $element ne $method; |
98
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3
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42
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$found_method = 1; |
99
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3
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8
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last; |
100
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} |
101
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6
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100
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30
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return 0 if !$found_method; |
102
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103
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3
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15
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my $prev = $element->sprevious_sibling(); |
104
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3
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50
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73
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return 0 if !$prev; |
105
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3
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50
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11
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return 0 if $prev ne '->'; |
106
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3
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50
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57
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return 0 if !$prev->isa('PPI::Token::Operator'); |
107
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108
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3
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12
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$prev = $prev->sprevious_sibling(); |
109
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3
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50
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64
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return 0 if !$prev; |
110
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3
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50
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8
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return 0 if $prev ne '$self'; |
111
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3
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50
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53
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return 0 if !$prev->isa('PPI::Token::Symbol'); |
112
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113
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# Save this check for last as its likely the most expensive. |
114
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3
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100
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13
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return 0 if _find_package_name( $element ) !~ m{::Controller::}; |
115
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116
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2
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82
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return 1; |
117
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} |
118
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119
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sub _find_package_name { |
120
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3
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3
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10
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my ($element) = @_; |
121
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122
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3
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7
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my $original = $element; |
123
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124
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3
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25
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while ($element) { |
125
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16
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100
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365
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if ($element->isa('PPI::Statement::Package')) { |
126
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# If this package statements is a block package, meaning: package { # stuff in package } |
127
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# then if we're a descendant of it its our package. |
128
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3
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50
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15
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return $element->namespace() if $element->ancestor_of( $original ); |
129
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130
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# If we've hit a non-block package then thats our package. |
131
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3
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73
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my $blocks = $element->find_any('PPI::Structure::Block'); |
132
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3
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50
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1046
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return $element->namespace() if !$blocks; |
133
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} |
134
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135
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# Keep walking backwards until we match the above logic or we get to |
136
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# the document root (main). |
137
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13
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66
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43
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$element = $element->sprevious_sibling() || $element->parent(); |
138
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} |
139
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140
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0
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0
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return 'main'; |
141
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} |
142
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143
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sub _gather_violations { |
144
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10
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10
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28
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my ($self, $statement) = @_; |
145
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146
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10
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24
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my @violations = (); |
147
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10
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40
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while ( $statement = $statement->snext_sibling() ) { |
148
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5
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170
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my @children = $statement->schildren(); |
149
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5
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50
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33
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89
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last if @children && $children[0]->isa('PPI::Token::Label'); |
150
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5
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100
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41
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next if $statement->isa('PPI::Statement::Sub'); |
151
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3
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50
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15
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next if $statement->isa('PPI::Statement::End'); |
152
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3
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50
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19
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next if $statement->isa('PPI::Statement::Data'); |
153
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3
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50
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15
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next if $statement->isa('PPI::Statement::Package'); |
154
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155
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3
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50
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33
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18
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next if $statement->isa('PPI::Statement::Include') && |
156
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$statement->type() ne 'require'; |
157
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158
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3
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50
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33
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22
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next if $statement->isa('PPI::Statement::Variable') && |
159
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$statement->type() eq 'our'; |
160
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161
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3
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24
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push @violations, $self->violation( $DESC, $EXPL, $statement ); |
162
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} |
163
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164
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10
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939
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return @violations; |
165
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} |
166
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167
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1; |
168
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__END__ |
169
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170
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=encoding utf-8 |
171
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172
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=head1 NAME |
173
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174
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Perl::Critic::Policy::Catalyst::ProhibitUnreachableCode - Don't write code after an unconditional Catalyst detach. |
175
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176
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=head1 DESCRIPTION |
177
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178
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This module was forked from |
179
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L<Perl::Critic::Policy::ControlStructures::ProhibitUnreachableCode> |
180
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version C<1.132> and modified to fit. |
181
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182
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The primary difference is this module looks for these two |
183
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Catalyst specific bits of code as signifying a terminating statement: |
184
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185
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$c->detach(); |
186
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$c->redirect_and_detach(); |
187
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188
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The C<redirect_and_detach> context method is available if you are using |
189
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L<Catalyst::Plugin::RedirectAndDetach>. |
190
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191
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=head1 PARAMETERS |
192
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193
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=head2 context_methods |
194
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195
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By default this policy looks for the C<detach> and C<redirect_and_detach> |
196
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context methods. You can specify additional context methods to look for |
197
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with the C<context_methods> parameter. In your C<.perlcriticrc> this |
198
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would look something like: |
199
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200
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[Catalyst::ProhibitUnreachableCode] |
201
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context_methods = my_detaching_method my_other_detaching_method |
202
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203
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This policy would then consider all of the following lines as |
204
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terminating statements: |
205
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206
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$c->detach(); |
207
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$c->redirect_and_detach(); |
208
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$c->my_detaching_method(); |
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$c->my_other_detaching_method(); |
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=head2 controller_methods |
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Sometimes controllers have in-house methods which call C<detach>, you |
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can specify those: |
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[Catalyst::ProhibitUnreachableCode] |
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controller_methods = foo bar |
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Then this policy would look for any package with C<::Controller::> in |
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its name and would consider the following lines as terminating |
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statements: |
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$self->foo(); |
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$self->bar(); |
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There are no default methods for this parameter. |
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=head1 SUPPORT |
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Please submit bugs and feature requests to the |
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Perl-Critic-Policy-Catalyst-ProhibitUnreachableCode GitHub issue tracker: |
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L<https://github.com/bluefeet/Perl-Critic-Policy-Catalyst-ProhibitUnreachableCode/issues> |
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=head1 ACKNOWLEDGEMENTS |
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Thanks to L<ZipRecruiter|https://www.ziprecruiter.com/> |
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for encouraging their employees to contribute back to the open |
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source ecosystem. Without their dedication to quality software |
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development this distribution would not exist. |
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=head1 AUTHORS |
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Aran Clary Deltac <bluefeet@gmail.com> |
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Peter Guzis <pguzis@cpan.org> |
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=head1 COPYRIGHT AND LICENSE |
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Copyright (C) 2019 Aran Clary Deltac |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation, either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see L<http://www.gnu.org/licenses/>. |
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=cut |
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