lib/ruby-1.9.1-rc1/lib/rss/dublincore.rb

   1 require "rss/rss"
   2
   3 module RSS
   4   DC_PREFIX = 'dc'
   5   DC_URI = "http://purl.org/dc/elements/1.1/"
   6
   7   module BaseDublinCoreModel
   8     def append_features(klass)
   9       super
  10
  11       return if klass.instance_of?(Module)
  12       DublinCoreModel::ELEMENT_NAME_INFOS.each do |name, plural_name|
  13         plural = plural_name || "#{name}s"
  14         full_name = "#{DC_PREFIX}_#{name}"
  15         full_plural_name = "#{DC_PREFIX}_#{plural}"
  16         klass_name = "DublinCore#{Utils.to_class_name(name)}"
  17         klass.install_must_call_validator(DC_PREFIX, DC_URI)
  18         klass.install_have_children_element(name, DC_URI, "*",
  19                                             full_name, full_plural_name)
  20         klass.module_eval(<<-EOC, *get_file_and_line_from_caller(0))
  21           remove_method :#{full_name}
  22           remove_method :#{full_name}=
  23           remove_method :set_#{full_name}
  24
  25           def #{full_name}
  26             @#{full_name}.first and @#{full_name}.first.value
  27           end
  28
  29           def #{full_name}=(new_value)
  30             @#{full_name}[0] = Utils.new_with_value_if_need(#{klass_name}, new_value)
  31           end
  32           alias set_#{full_name} #{full_name}=
  33         EOC
  34       end
  35       klass.module_eval(<<-EOC, *get_file_and_line_from_caller(0))
  36         if method_defined?(:date)
  37           alias date_without_#{DC_PREFIX}_date= date=
  38
  39           def date=(value)
  40             self.date_without_#{DC_PREFIX}_date = value
  41             self.#{DC_PREFIX}_date = value
  42           end
  43         else
  44           alias date #{DC_PREFIX}_date
  45           alias date= #{DC_PREFIX}_date=
  46         end
  47
  48         # For backward compatibility
  49         alias #{DC_PREFIX}_rightses #{DC_PREFIX}_rights_list
  50       EOC
  51     end
  52   end
  53
  54   module DublinCoreModel
  55
  56     extend BaseModel
  57     extend BaseDublinCoreModel
  58
  59     TEXT_ELEMENTS = {
  60       "title" => nil,
  61       "description" => nil,
  62       "creator" => nil,
  63       "subject" => nil,
  64       "publisher" => nil,
  65       "contributor" => nil,
  66       "type" => nil,
  67       "format" => nil,
  68       "identifier" => nil,
  69       "source" => nil,
  70       "language" => nil,
  71       "relation" => nil,
  72       "coverage" => nil,
  73       "rights" => "rights_list"
  74     }
  75
  76     DATE_ELEMENTS = {
  77       "date" => "w3cdtf",
  78     }
  79
  80     ELEMENT_NAME_INFOS = DublinCoreModel::TEXT_ELEMENTS.to_a
  81     DublinCoreModel::DATE_ELEMENTS.each do |name, |
  82       ELEMENT_NAME_INFOS << [name, nil]
  83     end
  84
  85     ELEMENTS = TEXT_ELEMENTS.keys + DATE_ELEMENTS.keys
  86
  87     ELEMENTS.each do |name, plural_name|
  88       module_eval(<<-EOC, *get_file_and_line_from_caller(0))
  89         class DublinCore#{Utils.to_class_name(name)} < Element
  90           include RSS10
  91
  92           content_setup
  93
  94           class << self
  95             def required_prefix
  96               DC_PREFIX
  97             end
  98
  99             def required_uri
 100               DC_URI
 101             end
 102           end
 103
 104           @tag_name = #{name.dump}
 105
 106           alias_method(:value, :content)
 107           alias_method(:value=, :content=)
 108
 109           def initialize(*args)
 110             if Utils.element_initialize_arguments?(args)
 111               super
 112             else
 113               super()
 114               self.content = args[0]
 115             end
 116           end
 117
 118           def full_name
 119             tag_name_with_prefix(DC_PREFIX)
 120           end
 121
 122           def maker_target(target)
 123             target.new_#{name}
 124           end
 125
 126           def setup_maker_attributes(#{name})
 127             #{name}.content = content
 128           end
 129         end
 130       EOC
 131     end
 132
 133     DATE_ELEMENTS.each do |name, type|
 134       tag_name = "#{DC_PREFIX}:#{name}"
 135       module_eval(<<-EOC, *get_file_and_line_from_caller(0))
 136         class DublinCore#{Utils.to_class_name(name)} < Element
 137           remove_method(:content=)
 138           remove_method(:value=)
 139
 140           date_writer("content", #{type.dump}, #{tag_name.dump})
 141
 142           alias_method(:value=, :content=)
 143         end
 144       EOC
 145     end
 146   end
 147
 148   # For backward compatibility
 149   DublincoreModel = DublinCoreModel
 150
 151   DublinCoreModel::ELEMENTS.each do |name|
 152     class_name = Utils.to_class_name(name)
 153     BaseListener.install_class_name(DC_URI, name, "DublinCore#{class_name}")
 154   end
 155
 156   DublinCoreModel::ELEMENTS.collect! {|name| "#{DC_PREFIX}_#{name}"}
 157 end
 158
 159 require 'rss/dublincore/1.0'
 160 require 'rss/dublincore/2.0'
 161 require 'rss/dublincore/atom'