2016-03-02T18:53:01 LayoutPosition

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

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Portions Copyright (c) 2011 Motorola Mobility, 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
@@ skipping 41 matching lines @@
 
 template <typename Strategy>
 VisiblePositionTemplate<Strategy>::VisiblePositionTemplate(const PositionWithAffinityTemplate<Strategy>& positionWithAffinity)
     : m_positionWithAffinity(positionWithAffinity)
 {
 }
 
 template<typename Strategy>
 VisiblePositionTemplate<Strategy> VisiblePositionTemplate<Strategy>::create(const PositionWithAffinityTemplate<Strategy>& positionWithAffinity)
 {
-    const PositionTemplate<Strategy> deepPosition = canonicalPositionOf(positionWithAffinity.position());
+    if (positionWithAffinity.isNull())
+        return VisiblePositionTemplate<Strategy>();
+    DCHECK(positionWithAffinity.position().inShadowIncludingDocument()) << positionWithAffinity;
+    const PositionTemplate<Strategy>& deepPosition = canonicalPositionOf(positionWithAffinity.position());
     if (deepPosition.isNull())
         return VisiblePositionTemplate<Strategy>();
-    DCHECK(positionWithAffinity.position().inShadowIncludingDocument()) << positionWithAffinity;
+    DCHECK(deepPosition.inShadowIncludingDocument()) << positionWithAffinity;
     const PositionWithAffinityTemplate<Strategy> downstreamPosition(deepPosition);
     if (positionWithAffinity.affinity() == TextAffinity::Downstream)
         return VisiblePositionTemplate<Strategy>(downstreamPosition);
 
     // When not at a line wrap, make sure to end up with
     // |TextAffinity::Downstream| affinity.
     const PositionWithAffinityTemplate<Strategy> upstreamPosition(deepPosition, TextAffinity::Upstream);
     if (inSameLine(downstreamPosition, upstreamPosition))
         return VisiblePositionTemplate<Strategy>(downstreamPosition);
     return VisiblePositionTemplate<Strategy>(upstreamPosition);
@@ skipping 17 matching lines @@
 VisiblePositionInFlatTree createVisiblePosition(const PositionInFlatTreeWithAffinity& positionWithAffinity)
 {
     return VisiblePositionInFlatTree::create(positionWithAffinity);
 }
 
 #ifndef NDEBUG
 
 template<typename Strategy>
 void VisiblePositionTemplate<Strategy>::debugPosition(const char* msg) const
 {
-    if (isNull()) {
-        fprintf(stderr, "Position [%s]: null\n", msg);
-        return;
-    }
-    deepEquivalent().debugPosition(msg);
+    VLOG(0) << msg << ' ' << *this;
 }
 
 template<typename Strategy>
 void VisiblePositionTemplate<Strategy>::formatForDebugger(char* buffer, unsigned length) const
 {
     deepEquivalent().formatForDebugger(buffer, length);
 }
 
 template<typename Strategy>
 void VisiblePositionTemplate<Strategy>::showTreeForThis() const
 {
     deepEquivalent().showTreeForThis();
+    VLOG(0) << *this;
 }
 
 #endif
 
 template class CORE_TEMPLATE_EXPORT VisiblePositionTemplate<EditingStrategy>;
 template class CORE_TEMPLATE_EXPORT VisiblePositionTemplate<EditingInFlatTreeStrategy>;
 
 std::ostream& operator<<(std::ostream& ostream, const VisiblePosition& position)
 {
     return ostream << position.deepEquivalent() << '/' << position.affinity();
@@ skipping 16 matching lines @@
     }
     DVLOG(0) << "Cannot showTree for (nil) VisiblePosition.";
 }
 
 void showTree(const blink::VisiblePosition& vpos)
 {
     vpos.showTreeForThis();
 }
 
 #endif