* lib/rss/rss.rb (Hash#merge, Enumerable#sort_by): removed.

* lib/rss/rss.rb (RSS::RootElementMixin#to_xml): added.
  [ruby-talk:197284]

  We can convert RSS version easily like the following:
    rss10 = RSS::Parser.parse(File.read("1.0.rdf"))
    File.open("2.0.rss", "w") {|f| f.print(rss10.to_xml("2.0"))}

* test/rss/test_1.0.rb: added #to_xml test.
* test/rss/test_2.0.rb: ditto.

* test/rss/rss-testcase.rb: added some helper methods that
  generates sample RSS 2.0.

* sample/rss/convert.rb: added a sample script to convert RSS format.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@10301 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/rss/rss-testcase.rb

@@ -140,6 +140,15 @@ EOR
 EORSS
     end
 
+    def make_sample_items20
+      RESOURCES.collect do |res|
+        elems = ["<link>#{res}</link>"]
+        elems << "<title>title of #{res}</title>"
+        elems = elems.join("\n")
+        item = "<item>\n#{elems}\n</item>"
+      end.join("\n")
+    end
+
     def make_channel20(content=nil)
       <<-EOC
 <channel>
@@ -154,7 +163,7 @@ EORSS
     <link>#{LINK_VALUE}</link>
   </image>
 
-#{RESOURCES.collect do |res| '<item><link>' + res + '</link></item>' end.join("\n")}
+#{make_sample_items20}
 
   <textInput>
     <title>#{TITLE_VALUE}</title>
@@ -190,6 +199,12 @@ EOI
 EOC
     end
 
+    def make_sample_rss20
+      make_rss20(<<-EOR)
+#{make_channel20}
+EOR
+    end
+
     def make_element(elem_name, attrs, contents)
       attrs_str = attrs.collect do |name, value|
         "#{h name}='#{h value}'"

test/rss/test_1.0.rb

@@ -233,6 +233,19 @@ module RSS
       end
     end
 
+    def test_to_xml
+      rss = RSS::Parser.parse(make_sample_RDF)
+      assert_equal(rss.to_s, rss.to_xml)
+      assert_equal(rss.to_s, rss.to_xml("1.0"))
+      rss09 = rss.to_xml("0.91") do |maker|
+        maker.channel.language = "en-us"
+      end
+      rss09 = RSS::Parser.parse(rss09)
+      assert_equal("0.91", rss09.rss_version)
+      rss20 = RSS::Parser.parse(rss.to_xml("2.0"))
+      assert_equal("2.0", rss20.rss_version)
+    end
+
     def test_indent_size
       assert_equal(0, RDF.indent_size)
       assert_equal(1, RDF::Channel.indent_size)

test/rss/test_2.0.rb

@@ -373,7 +373,20 @@ module RSS
       end
       assert_equal(source_params, actual)
     end
-    
+
+    def test_to_xml
+      rss = RSS::Parser.parse(make_sample_rss20)
+      assert_equal(rss.to_s, rss.to_xml)
+      assert_equal(rss.to_s, rss.to_xml("2.0"))
+      rss09 = RSS::Parser.parse(rss.to_xml("0.91"))
+      assert_equal("0.91", rss09.rss_version)
+      rss10 = rss.to_xml("1.0") do |maker|
+        maker.channel.about = "http://www.example.com/index.rdf"
+      end
+      rss10 = RSS::Parser.parse(rss10)
+      assert_equal("1.0", rss10.rss_version)
+    end
+
     def test_indent_size
       assert_equal(0, Rss.indent_size)
       assert_equal(1, Rss::Channel.indent_size)