--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/dom/NodeWithIndex.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2008 Apple Inc. All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#ifndef NodeWithIndex_h
+#define NodeWithIndex_h
+
+#include "Node.h"
+
+namespace WebCore {
+
+// For use when you want to get the index for a node repeatedly and
+// only want to walk the child list to figure out the index once.
+class NodeWithIndex {
+public:
+    NodeWithIndex(Node* node)
+        : m_node(node)
+        , m_haveIndex(false)
+    {
+        ASSERT(node);
+    }
+
+    Node* node() const { return m_node; }
+
+    int index() const
+    {
+        if (!m_haveIndex) {
+            m_index = m_node->nodeIndex();
+            m_haveIndex = true;
+        }
+        ASSERT(m_index == static_cast<int>(m_node->nodeIndex()));
+        return m_index;
+    }
+
+private:
+    Node* m_node;
+    mutable bool m_haveIndex;
+    mutable int m_index;
+};
+
+}
+
+#endif