* lib/rss: supported Image module.

  http://web.resource.org/rss/1.0/modules/image/


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@7876 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 216 insertions, 0 deletions

diff --git a/lib/rss/image.rb b/lib/rss/image.rb
new file mode 100644
index 0000000000..9cc3c73018
--- /dev/null
+++ b/lib/rss/image.rb
@@ -0,0 +1,216 @@
+require 'rss/1.0'
+require 'rss/dublincore'
+
+module RSS
+
+  IMAGE_PREFIX = 'image'
+  IMAGE_URI = 'http://web.resource.org/rss/1.0/modules/image/'
+
+  RDF.install_ns(IMAGE_PREFIX, IMAGE_URI)
+
+  module ImageModelUtils
+    def validate_one_tag_name(name, tags)
+      invalid = tags.find {|tag| tag != name}
+      raise UnknownTagError.new(invalid, IMAGE_URI) if invalid
+      raise TooMuchTagError.new(name, tag_name) if tags.size > 1
+    end
+  end
+  
+  module ImageItemModel
+    include ImageModelUtils
+    extend BaseModel
+
+    def self.append_features(klass)
+      super
+
+      klass.install_have_child_element("#{IMAGE_PREFIX}_item")
+    end
+
+    def image_validate(tags)
+      validate_one_tag_name("item", tags)
+    end
+    
+    class Item < Element
+      include RSS10
+      include DublinCoreModel
+
+      class << self
+        def required_prefix
+          IMAGE_PREFIX
+        end
+        
+        def required_uri
+          IMAGE_URI
+        end
+      end
+      
+      [
+        ["about", ::RSS::RDF::URI, true],
+        ["resource", ::RSS::RDF::URI, false],
+      ].each do |name, uri, required|
+        install_get_attribute(name, uri, required)
+      end
+
+      %w(width height).each do |tag|
+        full_name = "#{IMAGE_PREFIX}_#{tag}"
+        install_text_element(full_name)
+        BaseListener.install_get_text_element(tag, IMAGE_URI, "#{full_name}=")
+      end
+
+      def initialize(about=nil, resource=nil)
+        super()
+        @about = about
+        @resource = resource
+      end
+
+      def full_name
+        tag_name_with_prefix(IMAGE_PREFIX)
+      end
+      
+      def to_s(need_convert=true, indent=calc_indent)
+        rv = tag(indent) do |next_indent|
+          [
+            other_element(false, next_indent),
+          ]
+        end
+        rv = convert(rv) if need_convert
+        rv
+      end
+
+      alias _image_width= image_width=
+      def image_width=(new_value)
+        if @do_validate
+          self._image_width = Integer(new_value)
+        else
+          self._image_width = new_value.to_i
+        end
+      end
+
+      alias _image_height= image_height=
+      def image_height=(new_value)
+        if @do_validate
+          self._image_height = Integer(new_value)
+        else
+          self._image_height = new_value.to_i
+        end
+      end
+
+      alias width= image_width=
+      alias width image_width
+      alias height= image_height=
+      alias height image_height
+
+      private
+      def _tags
+        [
+          [IMAGE_URI, 'width'],
+          [IMAGE_URI, 'height'],
+        ].delete_if do |x|
+          send(x[1]).nil?
+        end
+      end
+        
+      def _attrs
+        [
+          ["#{::RSS::RDF::PREFIX}:about", true, "about"],
+          ["#{::RSS::RDF::PREFIX}:resource", false, "resource"],
+        ]
+      end
+
+      def maker_target(target)
+        target.image_item
+      end
+
+      def setup_maker_attributes(item)
+        item.about = self.about
+        item.resource = self.resource
+      end
+    end
+  end
+  
+  module ImageFaviconModel
+    include ImageModelUtils
+    extend BaseModel
+    
+    def self.append_features(klass)
+      super
+
+      unless klass.class == Module
+        klass.install_have_child_element("#{IMAGE_PREFIX}_favicon")
+      end
+    end
+
+    def image_validate(tags)
+      validate_one_tag_name("favicon", tags)
+    end
+    
+    class Favicon < Element
+      include RSS10
+      include DublinCoreModel
+
+      class << self
+        def required_prefix
+          IMAGE_PREFIX
+        end
+        
+        def required_uri
+          IMAGE_URI
+        end
+      end
+      
+      [
+        ["about", ::RSS::RDF::URI, true],
+        ["size", IMAGE_URI, true],
+      ].each do |name, uri, required|
+        install_get_attribute(name, uri, required)
+      end
+
+      alias image_size= size=
+      alias image_size size
+
+      def initialize(about=nil, size=nil)
+        super()
+        @about = about
+        @size = size
+      end
+
+      def full_name
+        tag_name_with_prefix(IMAGE_PREFIX)
+      end
+      
+      def to_s(need_convert=true, indent=calc_indent)
+        rv = tag(indent) do |next_indent|
+          [
+            other_element(false, next_indent),
+          ]
+        end
+        rv = convert(rv) if need_convert
+        rv
+      end
+
+      private
+      def _attrs
+        [
+          ["#{::RSS::RDF::PREFIX}:about", true, "about"],
+          ["#{IMAGE_PREFIX}:size", true, "size"],
+        ]
+      end
+
+      def maker_target(target)
+        target.image_favicon
+      end
+
+      def setup_maker_attributes(favicon)
+        favicon.about = self.about
+        favicon.size = self.size
+      end
+    end
+
+  end
+
+  class RDF
+    class Channel; include ImageFaviconModel; end
+    class Item; include ImageItemModel; end
+  end
+
+end