Implement ParentNode IDL interface

Source/core/dom/ContainerNode.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 12 matching lines @@
 #include "config.h"
 #include "core/dom/ContainerNode.h"
 
 #include "HTMLNames.h"
 #include "core/accessibility/AXObjectCache.h"
 #include "core/dom/ChildListMutationScope.h"
 #include "core/dom/ContainerNodeAlgorithms.h"
 #include "core/dom/EventNames.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/MutationEvent.h"
+#include "core/dom/NodeRareData.h"
 #include "core/dom/NodeRenderStyle.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/dom/TemplateContentDocumentFragment.h"
+#include "core/html/HTMLCollection.h"
 #include "core/html/shadow/InsertionPoint.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/loader/cache/MemoryCache.h"
 #include "core/page/Chrome.h"
 #include "core/page/ChromeClient.h"
 #include "core/page/Frame.h"
 #include "core/page/FrameView.h"
 #include "core/page/Page.h"
 #include "core/platform/graphics/FloatRect.h"
 #include "core/rendering/InlineTextBox.h"
@@ skipping 772 matching lines @@
     // note that we need to recalc the style
     // FIXME: Move to Element
     if (renderer()) {
         if (renderStyle()->affectedByHover() || (isElementNode() && toElement(this)->childrenAffectedByHover()))
             setNeedsStyleRecalc();
         if (renderer() && renderer()->style()->hasAppearance())
             renderer()->theme()->stateChanged(renderer(), HoverState);
     }
 }
 
+PassRefPtr<HTMLCollection> ContainerNode::children()
+{
+    return ensureRareData()->ensureNodeLists()->addCacheWithAtomicName<HTMLCollection>(this, NodeChildren);
+}
+
+Element* ContainerNode::firstElementChild() const
+{
+    return ElementTraversal::firstWithin(this);
+}
+
+Element* ContainerNode::lastElementChild() const
+{
+    Node* n = lastChild();
+    while (n && !n->isElementNode())
+        n = n->previousSibling();
+    return toElement(n);
+}
+
+unsigned ContainerNode::childElementCount() const
+{
+    unsigned count = 0;
+    Node* n = firstChild();
+    while (n) {
+        count += n->isElementNode();
+        n = n->nextSibling();
+    }
+    return count;
+}
+
 unsigned ContainerNode::childNodeCount() const
 {
     unsigned count = 0;
     Node *n;
     for (n = firstChild(); n; n = n->nextSibling())
         count++;
     return count;
 }
 
 Node *ContainerNode::childNode(unsigned index) const
@@ skipping 97 matching lines @@
         return true;
 
     if (node->isElementNode() && toElement(node)->shadow())
         return true;
 
     return false;
 }
 #endif
 
 } // namespace WebCore