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package RDF::Helper::Properties; |
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# Uhm, well, this should probably also be a role at some point... |
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5
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110852
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use RDF::Trine qw(iri variable statement); |
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2479790
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use Types::Standard qw(InstanceOf ArrayRef HashRef Object); |
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2
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24
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1675
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use Scalar::Util qw(blessed); |
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8
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2
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95
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use Carp qw(confess); |
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4
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2
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75
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9
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use Moo; |
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5176
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use namespace::autoclean -also => [qw/cached/]; |
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11820
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2
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our $VERSION = '0.24'; |
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has model => ( |
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is => 'ro', |
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isa => InstanceOf['RDF::Trine::Model'], |
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required => 1, |
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); |
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has [qw/ page_properties title_properties /] => ( |
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is => 'lazy', |
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isa => ArrayRef[InstanceOf['RDF::Trine::Node::Resource']], |
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predicate => 1, |
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clearer => 1, |
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); |
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use constant { |
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2
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_build_page_properties => [ |
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iri( 'http://xmlns.com/foaf/0.1/homepage' ), |
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iri( 'http://xmlns.com/foaf/0.1/page' ), |
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], |
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_build_title_properties => [ |
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iri( 'http://xmlns.com/foaf/0.1/name' ), |
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iri( 'http://purl.org/dc/terms/title' ), |
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iri( 'http://purl.org/dc/elements/1.1/title' ), |
36
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iri( 'http://www.w3.org/2004/02/skos/core#prefLabel' ), |
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iri( 'http://www.geonames.org/ontology#officialName' ), |
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iri( 'http://www.geonames.org/ontology#name' ), |
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iri( 'http://purl.org/vocabularies/getty/vp/labelPreferred' ), |
40
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iri( 'http://opengraphprotocol.org/schema/title' ), |
41
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iri( 'http://www.w3.org/2000/01/rdf-schema#label' ), |
42
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# doap ? |
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], |
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2
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2
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327
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}; |
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5
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45
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46
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has cache => ( |
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is => 'rw', |
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isa => HashRef|Object, |
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lazy => 1, |
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builder => 1, |
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predicate => 1, |
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clearer => 1, |
53
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); |
54
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55
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sub _build_cache |
56
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{ |
57
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+{ |
58
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1
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1
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43
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title => { |
59
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'<http://www.w3.org/2000/01/rdf-schema#label>' => 'label', |
60
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'<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>' => 'type', |
61
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}, |
62
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pred => { |
63
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'<http://www.w3.org/2000/01/rdf-schema#label>' => 'label', |
64
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'<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>' => 'type', |
65
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'<http://purl.org/dc/elements/1.1/type>' => 'Type', |
66
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}, |
67
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}; |
68
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} |
69
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70
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sub _cache_set |
71
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{ |
72
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3
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3
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128
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my ($self, $type, $uri, $value) = @_; |
73
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3
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91
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my $cache = $self->cache; |
74
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3
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50
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31
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if (blessed $cache) |
75
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0
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0
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{ $cache->set("$type$uri" => $value) } |
76
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else |
77
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3
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16
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{ $cache->{$type}{$uri} = $value } |
78
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3
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62
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return $value; |
79
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} |
80
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81
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sub _cache_get |
82
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{ |
83
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4
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4
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8
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my ($self, $type, $uri) = @_; |
84
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4
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80
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my $cache = $self->cache; |
85
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4
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50
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67
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if (blessed $cache) |
86
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0
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0
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{ return $cache->get("$type$uri") } |
87
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else |
88
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4
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43
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{ return $cache->{$type}{$uri} } |
89
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} |
90
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91
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# Helper function, cleaned away by namespace::autoclean |
92
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sub cached |
93
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{ |
94
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my ($method_name, $coderef) = @_; |
95
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2
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2
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866
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no strict 'refs'; |
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2
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5
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2
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1829
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96
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*{$method_name} = sub |
97
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{ |
98
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4
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4
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37100
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my ($self, $node) = @_; |
99
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4
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66
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11
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my $return = $self->_cache_get($method_name, $node) |
100
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|| $self->_cache_set($method_name, $node, $self->$coderef($node)); |
101
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102
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4
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50
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33
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358
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if (blessed $return and $return->isa('RDF::Trine::Node')) |
103
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{ |
104
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4
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100
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31
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if ($return->is_literal) |
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50
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105
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{ |
106
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return wantarray |
107
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2
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100
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16
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? ($return->literal_value, $return->literal_value_language, $return->literal_datatype) |
108
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: $return->literal_value; |
109
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} |
110
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elsif ($return->is_resource) |
111
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{ |
112
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2
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34
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return $return->uri_value; |
113
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} |
114
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else |
115
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{ |
116
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0
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return $return->as_string; |
117
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} |
118
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} |
119
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120
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0
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return $return; |
121
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} |
122
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} |
123
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124
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cached page => sub |
125
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{ |
126
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my ($self, $node) = @_; |
127
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128
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confess "Node argument needs to be a RDF::Trine::Node::Resource." |
129
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unless $node && $node->isa('RDF::Trine::Node::Resource'); |
130
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131
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my @props = @{ $self->page_properties }; |
132
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133
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my ($object) = |
134
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grep { blessed $_ and $_->is_resource } |
135
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scalar $self->model->objects_for_predicate_list($node, @props); |
136
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($object) = |
137
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grep { blessed $_ and $_->is_resource } |
138
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$self->model->objects_for_predicate_list($node, @props) |
139
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unless $object; |
140
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141
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return $object if $object; |
142
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143
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# Return the common link to ourselves |
144
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return iri($node->uri_value . '/page'); |
145
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}; |
146
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147
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cached title => sub |
148
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{ |
149
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my ($self, $node) = @_; |
150
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151
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my @props = @{ $self->title_properties }; |
152
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153
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my ($object) = |
154
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grep { blessed $_ and $_->is_literal } |
155
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scalar $self->model->objects_for_predicate_list($node, @props); |
156
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($object) = |
157
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grep { blessed $_ and $_->is_literal } |
158
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$self->model->objects_for_predicate_list($node, @props) |
159
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unless $object; |
160
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161
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return $object if $object; |
162
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163
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# and finally fall back on just returning the node |
164
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return $node; |
165
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}; |
166
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167
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cached description => sub |
168
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{ |
169
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my ($self, $node) = @_; |
170
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my $model = $self->model; |
171
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172
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my $iter = $model->get_statements( $node ); |
173
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my @label = @{ $self->title_properties }; |
174
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175
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my @desc; |
176
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while (my $st = $iter->next) |
177
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{ |
178
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my $p = $st->predicate; |
179
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my $ps; |
180
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181
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if ($ps = $self->_cache_get(pred => $p)) |
182
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{ 1 } |
183
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184
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elsif (my $pname = $model->objects_for_predicate_list($p, @label)) |
185
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{ $ps = $self->html_node_value( $pname ) } |
186
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187
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elsif ($p->is_resource and $p->uri_value =~ m<^http://www.w3.org/1999/02/22-rdf-syntax-ns#_(\d+)$>) |
188
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{ $ps = '#' . $1 } |
189
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190
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else |
191
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{ |
192
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# try to turn the predicate into a qname and use the local part as the printable name |
193
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my $name; |
194
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eval { |
195
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(undef, $name) = $p->qname; |
196
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}; |
197
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$ps = _escape( $name || $p->uri_value ); |
198
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} |
199
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200
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$self->_cache_set(pred => $p, $ps); |
201
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my $obj = $st->object; |
202
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my $os = $self->html_node_value( $obj, $p ); |
203
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204
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push(@desc, [$ps, $os]); |
205
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} |
206
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207
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return \@desc; |
208
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}; |
209
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210
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|
sub html_node_value |
211
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|
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{ |
212
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0
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0
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|
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my $self = shift; |
213
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0
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|
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|
my $n = shift; |
214
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0
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|
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|
my $rdfapred = shift; |
215
|
0
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|
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|
my $qname = ''; |
216
|
0
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my $xmlns = ''; |
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if ($rdfapred) |
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{ |
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eval { |
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my ($ns, $ln) = $rdfapred->qname; |
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$xmlns = qq[xmlns:ns="${ns}"]; |
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$qname = qq[ns:$ln]; |
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}; |
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} |
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return '' unless blessed $n; |
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if ($n->is_literal) |
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230
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{ |
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my $l = _escape( $n->literal_value ); |
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return $qname |
234
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? qq[<span $xmlns property="${qname}">$l</span>] |
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: $l; |
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} |
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elsif ($n->is_resource) |
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{ |
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my $uri = _escape( $n->uri_value ); |
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my $title = _escape( $self->title($n) ); |
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return $qname |
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? qq[<a $xmlns rel="${qname}" href="${uri}">$title</a>] |
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: qq[<a href="${uri}">$title</a>]; |
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} |
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else |
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{ |
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0
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return $n->as_string; |
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} |
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} |
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sub _escape |
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{ |
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my $l = shift; |
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for ($l) |
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{ |
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s/&/&/g; |
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s/</</g; |
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s/"/"/g; |
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} |
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return $l; |
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} |
265
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266
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__PACKAGE__->meta->make_immutable || 1; |
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__END__ |
268
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269
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=head1 NAME |
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271
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RDF::Helper::Properties - Module that provides shortcuts to retrieve certain information |
272
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273
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=head1 VERSION |
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275
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Version 0.22 |
276
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277
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=head1 SYNOPSIS |
278
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279
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my $helper = RDF::Helper::Properties->new($model); |
280
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print $helper->title($node); |
281
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282
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=head1 DESCRIPTION |
283
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284
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=head2 Constructor |
285
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286
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=over |
287
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288
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|
=item C<< new(model => $model, %attributes) >> |
289
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290
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|
Moose-style constructor. |
291
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292
|
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|
=back |
293
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294
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|
=head2 Attributes |
295
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296
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|
=over |
297
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298
|
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|
=item C<< model >> |
299
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|
300
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|
|
The RDF::Trine::Model which data will be extracted from. The only attribute |
301
|
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|
|
which the constructor requires. |
302
|
|
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|
303
|
|
|
|
|
|
|
=item C<< page_properties >> |
304
|
|
|
|
|
|
|
|
305
|
|
|
|
|
|
|
An arrayref of RDF::Trine::Node::Resource objects, each of which are |
306
|
|
|
|
|
|
|
taken to mean "something a bit like foaf:homepage". There is a sensible |
307
|
|
|
|
|
|
|
default. |
308
|
|
|
|
|
|
|
|
309
|
|
|
|
|
|
|
=item C<< title_properties >> |
310
|
|
|
|
|
|
|
|
311
|
|
|
|
|
|
|
An arrayref of RDF::Trine::Node::Resource objects, each of which are |
312
|
|
|
|
|
|
|
taken to mean "something a bit like foaf:name". There is a sensible |
313
|
|
|
|
|
|
|
default. |
314
|
|
|
|
|
|
|
|
315
|
|
|
|
|
|
|
=item C<< cache >> |
316
|
|
|
|
|
|
|
|
317
|
|
|
|
|
|
|
A hashref for caching data into, or a blessed object which supports C<get> |
318
|
|
|
|
|
|
|
and C<set> methods compatible with L<CHI> and L<Cache::Cache>. If you do not |
319
|
|
|
|
|
|
|
supply a cache, then a hashref will be used by default. |
320
|
|
|
|
|
|
|
|
321
|
|
|
|
|
|
|
=back |
322
|
|
|
|
|
|
|
|
323
|
|
|
|
|
|
|
=head2 Methods |
324
|
|
|
|
|
|
|
|
325
|
|
|
|
|
|
|
=over |
326
|
|
|
|
|
|
|
|
327
|
|
|
|
|
|
|
=item C<< page($node) >> |
328
|
|
|
|
|
|
|
|
329
|
|
|
|
|
|
|
A suitable page to redirect to, based on foaf:page or foaf:homepage. |
330
|
|
|
|
|
|
|
|
331
|
|
|
|
|
|
|
=item C<< title($node) >> |
332
|
|
|
|
|
|
|
|
333
|
|
|
|
|
|
|
A suitable title for the document will be returned, based on document contents. |
334
|
|
|
|
|
|
|
|
335
|
|
|
|
|
|
|
Called in list context, returns a ($value, $lang, $datatype) tuple. |
336
|
|
|
|
|
|
|
|
337
|
|
|
|
|
|
|
=item C<< description($node) >> |
338
|
|
|
|
|
|
|
|
339
|
|
|
|
|
|
|
A suitable description for the document will be returned, based on document contents |
340
|
|
|
|
|
|
|
|
341
|
|
|
|
|
|
|
=item C<< html_node_value($node) >> |
342
|
|
|
|
|
|
|
|
343
|
|
|
|
|
|
|
Formats the nodes for HTML output. |
344
|
|
|
|
|
|
|
|
345
|
|
|
|
|
|
|
=back |
346
|
|
|
|
|
|
|
|
347
|
|
|
|
|
|
|
=begin private |
348
|
|
|
|
|
|
|
|
349
|
|
|
|
|
|
|
=item C<< cached($subname, $coderef) >> |
350
|
|
|
|
|
|
|
|
351
|
|
|
|
|
|
|
Install a cached version of a sub. |
352
|
|
|
|
|
|
|
|
353
|
|
|
|
|
|
|
=end private |
354
|
|
|
|
|
|
|
|
355
|
|
|
|
|
|
|
=head1 AUTHOR |
356
|
|
|
|
|
|
|
|
357
|
|
|
|
|
|
|
Most of the code was written by Gregory Todd Williams C<< |
358
|
|
|
|
|
|
|
<gwilliams@cpan.org> >> for L<RDF::LinkedData::Apache>, but refactored |
359
|
|
|
|
|
|
|
into this class for use by other modules by Kjetil Kjernsmo, C<< |
360
|
|
|
|
|
|
|
<kjetilk at cpan.org> >>, then refactored again by Toby Inkster, |
361
|
|
|
|
|
|
|
C<< <tobyink at cpan.org> >>. |
362
|
|
|
|
|
|
|
|
363
|
|
|
|
|
|
|
=head1 COPYRIGHT & LICENSE |
364
|
|
|
|
|
|
|
|
365
|
|
|
|
|
|
|
Copyright 2010 Gregory Todd Williams and ABC Startsiden AS. |
366
|
|
|
|
|
|
|
|
367
|
|
|
|
|
|
|
Copyright 2012 Toby Inkster. |
368
|
|
|
|
|
|
|
|
369
|
|
|
|
|
|
|
This program is free software; you can redistribute it and/or modify it |
370
|
|
|
|
|
|
|
under the same terms as Perl itself. |
371
|
|
|
|
|
|
|
|