Make sure the root node of selector queries is a ContainerNode

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 17 matching lines @@
 #include "core/dom/ClassNodeList.h"
 #include "core/dom/ContainerNodeAlgorithms.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/FullscreenElementStack.h"
 #include "core/dom/NameNodeList.h"
 #include "core/dom/NodeChildRemovalTracker.h"
 #include "core/dom/NodeRareData.h"
 #include "core/dom/NodeRenderStyle.h"
 #include "core/dom/NodeTraversal.h"
+#include "core/dom/SelectorQuery.h"
 #include "core/events/MutationEvent.h"
 #include "core/events/ThreadLocalEventNames.h"
 #include "core/html/HTMLCollection.h"
 #include "core/html/RadioNodeList.h"
 #include "core/rendering/InlineTextBox.h"
 #include "core/rendering/RenderText.h"
 #include "core/rendering/RenderTheme.h"
 #include "core/rendering/RenderView.h"
 #include "core/rendering/RenderWidget.h"
 
@@ skipping 855 matching lines @@
 
 Node *ContainerNode::childNode(unsigned index) const
 {
     unsigned i;
     Node *n = firstChild();
     for (i = 0; n != 0 && i < index; i++)
         n = n->nextSibling();
     return n;
 }
 
+PassRefPtr<Element> ContainerNode::querySelector(const AtomicString& selectors, ExceptionState& exceptionState)
+{
+    if (selectors.isEmpty()) {
+        exceptionState.throwDOMException(SyntaxError, "The provided selector is empty.");
+        return 0;
+    }
+
+    SelectorQuery* selectorQuery = document().selectorQueryCache().add(selectors, document(), exceptionState);
+    if (!selectorQuery)
+        return 0;
+    return selectorQuery->queryFirst(*this);
+}
+
+PassRefPtr<NodeList> ContainerNode::querySelectorAll(const AtomicString& selectors, ExceptionState& exceptionState)
+{
+    if (selectors.isEmpty()) {
+        exceptionState.throwDOMException(SyntaxError, "The provided selector is empty.");
+        return 0;
+    }
+
+    SelectorQuery* selectorQuery = document().selectorQueryCache().add(selectors, document(), exceptionState);
+    if (!selectorQuery)
+        return 0;
+    return selectorQuery->queryAll(*this);
+}
+
 static void dispatchChildInsertionEvents(Node& child)
 {
     if (child.isInShadowTree())
         return;
 
     ASSERT(!NoEventDispatchAssertion::isEventDispatchForbidden());
 
     RefPtr<Node> c(child);
     RefPtr<Document> document(child.document());
 
@@ skipping 101 matching lines @@
         return true;
 
     if (node->isElementNode() && toElement(node)->shadow())
         return true;
 
     return false;
 }
 #endif
 
 } // namespace WebCore