summaryrefslogtreecommitdiff
path: root/lib/rss/trackback.rb
blob: ad6954f3f515661c107f8500b1708be89b97adbf (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
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
require 'rss/1.0'
require 'rss/2.0'

module RSS

  TRACKBACK_PREFIX = 'trackback'
  TRACKBACK_URI = 'http://madskills.com/public/xml/rss/module/trackback/'

  RDF.install_ns(TRACKBACK_PREFIX, TRACKBACK_URI)
  Rss.install_ns(TRACKBACK_PREFIX, TRACKBACK_URI)

  module TrackBackUtils
    private
    def trackback_validate(tags)
      counter = {}
      %w(ping about).each do |name|
        counter["#{TRACKBACK_PREFIX}_#{name}"] = 0
      end

      tags.each do |tag|
        key = "#{TRACKBACK_PREFIX}_#{tag}"
        raise UnknownTagError.new(tag, TRACKBACK_URI) unless counter.has_key?(key)
        counter[key] += 1
        if tag != "about" and counter[key] > 1
          raise TooMuchTagError.new(tag, tag_name)
        end
      end

      if counter["#{TRACKBACK_PREFIX}_ping"].zero? and
          counter["#{TRACKBACK_PREFIX}_about"].nonzero?
        raise MissingTagError.new("#{TRACKBACK_PREFIX}:ping", tag_name)
      end
    end
  end
  
  module BaseTrackBackModel

    ELEMENTS = %w(ping about)
    
    def append_features(klass)
      super

      unless klass.class == Module
        klass.module_eval {include TrackBackUtils}

        %w(ping).each do |name|
          var_name = "#{TRACKBACK_PREFIX}_#{name}"
          klass_name = "TrackBack#{Utils.to_class_name(name)}"
          klass.install_have_child_element(var_name)
          klass.module_eval(<<-EOC, __FILE__, __LINE__)
            remove_method :#{var_name}
            def #{var_name}
              @#{var_name} and @#{var_name}.value
            end

            remove_method :#{var_name}=
            def #{var_name}=(value)
              @#{var_name} = Utils.new_with_value_if_need(#{klass_name}, value)
            end
          EOC
        end
        
        [%w(about s)].each do |name, postfix|
          var_name = "#{TRACKBACK_PREFIX}_#{name}"
          klass_name = "TrackBack#{Utils.to_class_name(name)}"
          klass.install_have_children_element(var_name)
          klass.module_eval(<<-EOC, __FILE__, __LINE__)
            remove_method :#{var_name}
            def #{var_name}(*args)
              if args.empty?
                @#{var_name}.first and @#{var_name}.first.value
              else
                ret = @#{var_name}.__send__("[]", *args)
                if ret.is_a?(Array)
                  ret.collect {|x| x.value}
                else
                  ret.value
                end
              end
            end

            remove_method :#{var_name}=
            remove_method :set_#{var_name}
            def #{var_name}=(*args)
              if args.size == 1
                item = Utils.new_with_value_if_need(#{klass_name}, args[0])
                @#{var_name}.push(item)
              else
                new_val = args.last
                if new_val.is_a?(Array)
                  new_val = new_value.collect do |val|
                    Utils.new_with_value_if_need(#{klass_name}, val)
                  end
                else
                  new_val = Utils.new_with_value_if_need(#{klass_name}, new_val)
                end
                @#{var_name}.__send__("[]=", *(args[0..-2] + [new_val]))
              end
            end
            alias set_#{var_name} #{var_name}=
          EOC
        end
      end
    end
  end

  module TrackBackModel10
    extend BaseModel
    extend BaseTrackBackModel

    class TrackBackPing < Element
      include RSS10

      class << self

        def required_prefix
          TRACKBACK_PREFIX
        end
        
        def required_uri
          TRACKBACK_URI
        end

      end

      @tag_name = "ping"
      
      [
        ["resource", ::RSS::RDF::URI, true]
      ].each do |name, uri, required|
        install_get_attribute(name, uri, required)
      end

      alias_method(:value, :resource)
      alias_method(:value=, :resource=)
      
      def initialize(resource=nil)
        super()
        @resource = resource
      end

      def full_name
        tag_name_with_prefix(TRACKBACK_PREFIX)
      end
      
      def to_s(need_convert=true, indent=calc_indent)
        rv = tag(indent)
        rv = convert(rv) if need_convert
        rv
      end

      private
      def _attrs
        [
          ["#{::RSS::RDF::PREFIX}:resource", true, "resource"],
        ]
      end

    end

    class TrackBackAbout < Element
      include RSS10

      class << self
        
        def required_prefix
          TRACKBACK_PREFIX
        end
        
        def required_uri
          TRACKBACK_URI
        end

      end
      
      @tag_name = "about"
      
      [
        ["resource", ::RSS::RDF::URI, true]
      ].each do |name, uri, required|
        install_get_attribute(name, uri, required)
      end

      alias_method(:value, :resource)
      alias_method(:value=, :resource=)
      
      def initialize(resource=nil)
        super()
        @resource = resource
      end

      def full_name
        tag_name_with_prefix(TRACKBACK_PREFIX)
      end
      
      def to_s(need_convert=true, indent=calc_indent)
        rv = tag(indent)
        rv = convert(rv) if need_convert
        rv
      end

      private
      def _attrs
        [
          ["#{::RSS::RDF::PREFIX}:resource", true, "resource"],
        ]
      end

      def maker_target(abouts)
        abouts.new_about
      end

      def setup_maker_attributes(about)
        about.resource = self.resource
      end
      
    end
  end

  module TrackBackModel20
    extend BaseModel
    extend BaseTrackBackModel

    class TrackBackPing < Element
      include RSS09

      @tag_name = "ping"
      
      content_setup

      class << self

        def required_prefix
          TRACKBACK_PREFIX
        end
        
        def required_uri
          TRACKBACK_URI
        end

      end
      
      alias_method(:value, :content)
      alias_method(:value=, :content=)

      def initialize(content=nil)
        super()
        @content = content
      end
      
      def full_name
        tag_name_with_prefix(TRACKBACK_PREFIX)
      end
      
    end

    class TrackBackAbout < Element
      include RSS09

      @tag_name = "about"
      
      content_setup

      class << self
        
        def required_prefix
          TRACKBACK_PREFIX
        end
        
        def required_uri
          TRACKBACK_URI
        end

      end

      alias_method(:value, :content)
      alias_method(:value=, :content=)

      def initialize(content=nil)
        super()
        @content = content
      end
      
      def full_name
        tag_name_with_prefix(TRACKBACK_PREFIX)
      end
      
    end
  end

  class RDF
    class Item; include TrackBackModel10; end
  end

  class Rss
    class Channel
      class Item; include TrackBackModel20; end
    end
  end

  BaseTrackBackModel::ELEMENTS.each do |name|
    class_name = Utils.to_class_name(name)
    BaseListener.install_class_name(TRACKBACK_URI, name,
                                    "TrackBack#{class_name}")
  end

  BaseTrackBackModel::ELEMENTS.collect! {|name| "#{TRACKBACK_PREFIX}_#{name}"}
end