DO NOT SUBMIT

Source/WebCore/dom/Range.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Gunnstein Lye (gunnstein@netcom.no)
  * (C) 2000 Frederik Holljen (frederik.holljen@hig.no)
  * (C) 2001 Peter Kelly (pmk@post.com)
  * 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
@@ skipping 1516 matching lines @@
         if (n->isReadOnlyNode())
             return true;
     }
     for (Node* n = m_end.container(); n; n = n->parentNode()) {
         if (n->isReadOnlyNode())
             return true;
     }
     return false;
 }
 
+bool Range::getLocationAndLength(unsigned& location, unsigned& length)
+{
+    location = notFound;
+    length = 0;
+
+    if (!startContainer())
+        return false;
+
+    Element* selectionRoot = ownerDocument()->frame()->selection()->rootEditableElement();
+    Element* scope = selectionRoot ? selectionRoot : ownerDocument()->documentElement();
+
+    // Mouse events may cause TSM to attempt to create an NSRange for a portion of the view
+    // that is not inside the current editable region.  These checks ensure we don't produce
+    // potentially invalid data when responding to such requests.
+    if (startContainer() != scope && !startContainer()->isDescendantOf(scope))
+        return false;
+    if (endContainer() != scope && !endContainer()->isDescendantOf(scope))
+        return false;
+
+    RefPtr<Range> testRange = Range::create(scope->document(), scope, 0, startContainer(), startOffset());
+    ASSERT(testRange->startContainer() == scope);
+    location = TextIterator::rangeLength(testRange.get());
+    
+    ExceptionCode ec;
+    testRange->setEnd(endContainer(), endOffset(), ec);
+    ASSERT(testRange->startContainer() == scope);
+    length = TextIterator::rangeLength(testRange.get()) - location;
+    return true;
+}
+
 Node* Range::firstNode() const
 {
     if (!m_start.container())
         return 0;
     if (m_start.container()->offsetInCharacters())
         return m_start.container();
     if (Node* child = m_start.container()->childNode(m_start.offset()))
         return child;
     if (!m_start.offset())
         return m_start.container();
@@ skipping 424 matching lines @@
 
 void showTree(const WebCore::Range* range)
 {
     if (range && range->boundaryPointsValid()) {
         range->startContainer()->showTreeAndMark(range->startContainer(), "S", range->endContainer(), "E");
         fprintf(stderr, "start offset: %d, end offset: %d\n", range->startOffset(), range->endOffset());
     }
 }
 
 #endif