[html5lib] implement querySelector/querySelectorAll

pkg/third_party/html5lib/lib/src/treebuilder.dart

 /// Internals to the tree builders.
 library treebuilder;
 
 import 'dart:collection';
 import 'package:html5lib/dom.dart';
 import 'package:html5lib/parser.dart' show getElementNameTuple;
 import 'package:source_maps/span.dart' show FileSpan;
 import 'constants.dart';
 import 'list_proxy.dart';
 import 'token.dart';
@@ skipping 233 matching lines @@
       parent = openElements.last;
     }
     parent.nodes.add(new Comment(token.data)..sourceSpan = token.span);
   }
 
   /// Create an element but don't insert it anywhere
   Element createElement(StartTagToken token) {
     var name = token.name;
     var namespace = token.namespace;
     if (namespace == null) namespace = defaultNamespace;
-    var element = new Element(name, namespace)
+    var element = document.createElementNS(namespace, name)
         ..attributes = token.data
         ..sourceSpan = token.span;
     return element;
   }
 
   Element insertElement(StartTagToken token) {
     if (insertFromTable) return insertElementTable(token);
     return insertElementNormal(token);
   }
 
   Element insertElementNormal(StartTagToken token) {
     var name = token.name;
     var namespace = token.namespace;
     if (namespace == null) namespace = defaultNamespace;
-    var element = new Element(name, namespace)
+    var element = document.createElementNS(namespace, name)
         ..attributes = token.data
         ..sourceSpan = token.span;
     openElements.last.nodes.add(element);
     openElements.add(element);
     return element;
   }
 
   Element insertElementTable(token) {
     /// Create an element and insert it into the tree
     var element = createElement(token);
@@ skipping 70 matching lines @@
     var insertBefore = null;
     for (var elm in openElements.reversed) {
       if (elm.localName == "table") {
         lastTable = elm;
         break;
       }
     }
     if (lastTable != null) {
       // XXX - we should really check that this parent is actually a
       // node here
-      if (lastTable.parent != null) {
-        fosterParent = lastTable.parent;
+      if (lastTable.parentNode != null) {
+        fosterParent = lastTable.parentNode;
         insertBefore = lastTable;
       } else {
         fosterParent = openElements[openElements.indexOf(lastTable) - 1];
       }
     } else {
       fosterParent = openElements[0];
     }
     return [fosterParent, insertBefore];
   }
 
@@ skipping 13 matching lines @@
   Document getDocument() => document;
 
   /// Return the final fragment.
   DocumentFragment getFragment() {
     //XXX assert innerHTML
     var fragment = new DocumentFragment();
     openElements[0].reparentChildren(fragment);
     return fragment;
   }
 }