Implement Node.treeRoot

third_party/WebKit/Source/core/dom/Node.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, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 432 matching lines @@
             return last;
         last = currentElement->lastChild();
         if (!last)
             last = currentElement->pseudoElement(BEFORE);
         return last;
     }
 
     return lastChild();
 }
 
+Node& Node::treeRoot() const
+{
+    if (isInTreeScope())
+        return treeScope().rootNode();
+    const Node* node = this;
+    while (node->parentNode())
+        node = node->parentNode();
+    return const_cast<Node&>(*node);
+}
+
 PassRefPtrWillBeRawPtr<Node> Node::insertBefore(PassRefPtrWillBeRawPtr<Node> newChild, Node* refChild, ExceptionState& exceptionState)
 {
     if (isContainerNode())
         return toContainerNode(this)->insertBefore(newChild, refChild, exceptionState);
 
     exceptionState.throwDOMException(HierarchyRequestError, "This node type does not support this method.");
     return nullptr;
 }
 
 PassRefPtrWillBeRawPtr<Node> Node::replaceChild(PassRefPtrWillBeRawPtr<Node> newChild, PassRefPtrWillBeRawPtr<Node> oldChild, ExceptionState& exceptionState)
@@ skipping 1952 matching lines @@
 
 void showNodePath(const blink::Node* node)
 {
     if (node)
         node->showNodePathForThis();
     else
         fprintf(stderr, "Cannot showNodePath for (nil)\n");
 }
 
 #endif