2016-03-02T18:53:01 LayoutPosition

third_party/WebKit/Source/core/editing/DOMSelection.cpp

 /*
  * Copyright (C) 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Google 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.
@@ skipping 270 matching lines @@
         exceptionState.throwDOMException(IndexSizeError, String::number(extentOffset) + " is not a valid extent offset.");
         return;
     }
 
     if (!baseNode || !extentNode)
         UseCounter::count(m_frame, UseCounter::SelectionSetBaseAndExtentNull);
 
     if (!isValidForPosition(baseNode) || !isValidForPosition(extentNode))
         return;
 
+    // We check |DocumentTypeNode| here instead of |isValidForPosition()|,
+    // since, |collapse()| throws error for |DocumentTypeNode|, but
+    // |setBaseAndExtent()| doesn't.
+    if (baseNode && baseNode->isDocumentTypeNode())
+        return;
+    if (extentNode && extentNode->isDocumentTypeNode())
+        return;
+
     VisiblePosition visibleBase = createVisiblePosition(createPosition(baseNode, baseOffset));
     VisiblePosition visibleExtent = createVisiblePosition(createPosition(extentNode, extentOffset));
 
     m_frame->selection().moveTo(visibleBase, visibleExtent);
 }
 
 void DOMSelection::modify(const String& alterString, const String& directionString, const String& granularityString)
 {
     if (!m_frame)
         return;
@@ skipping 55 matching lines @@
         return;
     }
     if (static_cast<unsigned>(offset) > node->lengthOfContents()) {
         exceptionState.throwDOMException(IndexSizeError, String::number(offset) + " is larger than the given node's length.");
         return;
     }
 
     if (!isValidForPosition(node))
         return;
 
+    // We check |DocumentTypeNode| here instead of |isValidForPosition()|,
+    // since, |collapse()| throws error for |DocumentTypeNode|, but
+    // |setBaseAndExtent()| doesn't.
+    if (node && node->isDocumentTypeNode())
+        return;
+
     m_frame->selection().setExtent(createVisiblePosition(createPosition(node, offset)));
 }
 
 Range* DOMSelection::getRangeAt(int index, ExceptionState& exceptionState)
 {
     if (!m_frame)
         return nullptr;
 
     if (index < 0 || index >= rangeCount()) {
         exceptionState.throwDOMException(IndexSizeError, String::number(index) + " is not a valid index.");
@@ skipping 193 matching lines @@
         m_treeScope->document().addConsoleMessage(ConsoleMessage::create(JSMessageSource, ErrorMessageLevel, message));
 }
 
 DEFINE_TRACE(DOMSelection)
 {
     visitor->trace(m_treeScope);
     DOMWindowProperty::trace(visitor);
 }
 
 } // namespace blink