Sync with latest HTML5lib and latest Maruku

vendor/plugins/HTML5lib/lib/html5/treewalkers/rexml.rb

@@ -0,0 +1,48 @@
+require 'html5/treewalkers/base'
+require 'rexml/document'
+
+module HTML5
+  module TreeWalkers
+    module REXML
+      class TreeWalker < HTML5::TreeWalkers::NonRecursiveTreeWalker
+
+        def node_details(node)
+          case node
+          when ::REXML::Document
+            [:DOCUMENT]
+          when ::REXML::Element
+            if !node.name
+              [:DOCUMENT_FRAGMENT]
+            else
+              [:ELEMENT, node.name,
+                node.attributes.map {|name,value| [name,value]},
+                node.has_elements? || node.has_text?]
+            end
+          when ::REXML::Text
+            [:TEXT, node.value]
+          when ::REXML::Comment
+            [:COMMENT, node.string]
+          when ::REXML::DocType
+            [:DOCTYPE, node.name]
+          when ::REXML::XMLDecl
+            [nil]
+          else
+            [:UNKNOWN, node.class.inspect]
+          end
+        end
+
+        def first_child(node)
+          node.children.first
+        end
+
+        def next_sibling(node)
+          node.next_sibling
+        end
+
+        def parent(node)
+          node.parent
+        end
+      end
+    end
+  end
+end