* test/rss/test_xml-stylesheet.rb: added tests for xml-stylesheet.

* lib/rss/xml-stylesheet.rb: added xml-stylesheet parsing
  function.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@5989 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 94 insertions, 0 deletions

diff --git a/lib/rss/xml-stylesheet.rb b/lib/rss/xml-stylesheet.rb
new file mode 100644
index 0000000000..7862c4f278
--- /dev/null
+++ b/lib/rss/xml-stylesheet.rb
@@ -0,0 +1,94 @@
+require "rss/utils"
+
+module RSS
+
+	module XMLStyleSheetMixin
+		attr_accessor :xml_stylesheets
+		def initialize(*args)
+			super
+			@xml_stylesheets = []
+		end
+		
+		private
+		def xml_stylesheet_pi
+			xsss = @xml_stylesheets.collect do |xss|
+				pi = xss.to_s
+				pi = nil if /\A\s*\z/ =~ pi
+				pi
+			end.compact
+			xsss.push("") unless xsss.empty?
+			xsss.join("\n")
+		end
+	end
+
+	class XMLStyleSheet
+
+		include Utils
+
+		ATTRIBUTES = %w(href type title media charset alternate)
+
+		GUESS_TABLE = {
+			"xsl" => "text/xsl",
+			"css" => "text/css",
+		}
+
+		attr_accessor(*ATTRIBUTES)
+		attr_accessor(:do_validate)
+		def initialize(*attrs)
+			@do_validate = true
+			ATTRIBUTES.each do |attr|
+				self.send("#{attr}=", nil)
+			end
+			vars = ATTRIBUTES.dup
+			vars.unshift(:do_validate)
+			attrs.each do |name, value|
+				if vars.include?(name.to_s)
+					self.send("#{name}=", value)
+				end
+			end
+		end
+
+		def to_s
+			rv = ""
+			if @href
+				rv << %Q[<?xml-stylesheet]
+				ATTRIBUTES.each do |name|
+					if self.send(name)
+						rv << %Q[ #{name}="#{h self.send(name)}"]
+					end
+				end
+				rv << %Q[?>]
+			end
+			rv
+		end
+
+		remove_method(:href=)
+		def href=(value)
+			@href = value
+			if @href and @type.nil?
+				@type = guess_type(@href)
+			end
+			@href
+		end
+
+		remove_method(:alternate=)
+		def alternate=(value)
+			if value.nil? or /\A(?:yes|no)\z/ =~ value
+				@alternate = value
+			else
+				if @do_validate
+					args = ["?xml-stylesheet?", %Q[alternate="#{value}"]]
+					raise NotAvailableValueError.new(*args)
+				end
+			end
+			@alternate
+		end
+
+		private
+		def guess_type(filename)
+			/\.([^.]+)/ =~ filename
+			GUESS_TABLE[$1]
+		end
+
+	end
+end