summaryrefslogtreecommitdiff
path: root/lib/rss/dublincore.rb
blob: af64d19183ea10dc9afe9d6a8975d2b60ec74a93 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
require "rss/1.0"

module RSS

  DC_PREFIX = 'dc'
  DC_URI = "http://purl.org/dc/elements/1.1/"
  
  RDF.install_ns(DC_PREFIX, DC_URI)

  module BaseDublinCoreModel
    def append_features(klass)
      super

      return if klass.instance_of?(Module)
      DublinCoreModel::ELEMENT_NAME_INFOS.each do |name, plural_name|
        plural = plural_name || "#{name}s"
        full_name = "#{DC_PREFIX}_#{name}"
        full_plural_name = "#{DC_PREFIX}_#{plural}"
        klass_name = "DublinCore#{Utils.to_class_name(name)}"
        klass.module_eval(<<-EOC, *get_file_and_line_from_caller(0))
          install_have_children_element(#{full_name.dump},
                                        #{full_plural_name.dump})

          remove_method :#{full_name}
          remove_method :#{full_name}=
          remove_method :set_#{full_name}

          def #{full_name}
            @#{full_name}.first and @#{full_name}.first.value
          end
          
          def #{full_name}=(new_value)
            @#{full_name}[0] = Utils.new_with_value_if_need(#{klass_name}, new_value)
          end
          alias set_#{full_name} #{full_name}=
        EOC
      end
      klass.module_eval(<<-EOC, *get_file_and_line_from_caller(0))
        alias date #{DC_PREFIX}_date
        alias date= #{DC_PREFIX}_date=
      EOC
    end
  end
  
  module DublinCoreModel

    extend BaseModel
    extend BaseDublinCoreModel

    TEXT_ELEMENTS = {
      "title" => nil,
      "description" => nil,
      "creator" => nil,
      "subject" => nil,
      "publisher" => nil,
      "contributor" => nil,
      "type" => nil,
      "format" => nil,
      "identifier" => nil,
      "source" => nil,
      "language" => nil,
      "relation" => nil,
      "coverage" => nil,
      "rights" => "rightses" # FIXME
    }

    DATE_ELEMENTS = {
      "date" => "w3cdtf",
    }
    
    ELEMENT_NAME_INFOS = DublinCoreModel::TEXT_ELEMENTS.to_a
    DublinCoreModel::DATE_ELEMENTS.each do |name, _|
      ELEMENT_NAME_INFOS << [name, nil]
    end
    
    ELEMENTS = TEXT_ELEMENTS.keys + DATE_ELEMENTS.keys

    ELEMENTS.each do |name, plural_name|
      module_eval(<<-EOC, *get_file_and_line_from_caller(0))
        class DublinCore#{Utils.to_class_name(name)} < Element
          include RSS10
          
          content_setup

          class << self
            def required_prefix
              DC_PREFIX
            end
        
            def required_uri
              DC_URI
            end
          end

          @tag_name = #{name.dump}

          alias_method(:value, :content)
          alias_method(:value=, :content=)
          
          def initialize(content=nil)
            super()
            self.content = content
          end
      
          def full_name
            tag_name_with_prefix(DC_PREFIX)
          end

          def maker_target(target)
            target.new_#{name}
          end

          def setup_maker_attributes(#{name})
            #{name}.content = content
          end
        end
      EOC
    end

    DATE_ELEMENTS.each do |name, type|
      module_eval(<<-EOC, *get_file_and_line_from_caller(0))
        class DublinCore#{Utils.to_class_name(name)} < Element
          remove_method(:content=)
          remove_method(:value=)

          date_writer("content", #{type.dump}, #{name.dump})
          
          alias_method(:value=, :content=)
        end
      EOC
    end
      
    def dc_validate(tags)
      tags.each do |tag|
        key = "#{DC_PREFIX}_#{tag}"
        unless DublinCoreModel::ELEMENTS.include?(key)
          raise UnknownTagError.new(tag, DC_URI)
        end
      end
    end

  end

  # For backward compatibility
  DublincoreModel = DublinCoreModel

  class RDF
    class Channel; include DublinCoreModel; end
    class Image; include DublinCoreModel; end
    class Item; include DublinCoreModel; end
    class Textinput; include DublinCoreModel; end
  end

  DublinCoreModel::ELEMENTS.each do |name|
    class_name = Utils.to_class_name(name)
    BaseListener.install_class_name(DC_URI, name, "DublinCore#{class_name}")
  end

  DublinCoreModel::ELEMENTS.collect! {|name| "#{DC_PREFIX}_#{name}"}
end