Introduce EphemeralRange::nodes() helper to traverse over a range.

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/editing/EphemeralRange.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/Range.h"
 #include "core/dom/Text.h"
@@ skipping 127 matching lines @@
 }
 #endif
 
 Range* createRange(const EphemeralRange& range)
 {
     if (range.isNull())
         return nullptr;
     return Range::create(range.document(), range.startPosition(), range.endPosition());
 }
 
+internal::RangeTraversal inRange(const Position& start, const Position& end)
+{
+    return internal::RangeTraversal(start.nodeAsRangeFirstNode(), end.nodeAsRangePastLastNode());
+}
+
+internal::RangeTraversalInFlatTree inRange(const PositionInFlatTree& start, const PositionInFlatTree& end)
+{
+    return internal::RangeTraversalInFlatTree(start.nodeAsRangeFirstNode(), end.nodeAsRangePastLastNode());
+}
+
+internal::RangeTraversal inRange(const EphemeralRange& range)
+{
+    return inRange(range.startPosition(), range.endPosition());
+}
+
+internal::RangeTraversalInFlatTree inRange(const EphemeralRangeInFlatTree& range)
+{
+    return inRange(range.startPosition(), range.endPosition());
+}
+
 template class CORE_TEMPLATE_EXPORT EphemeralRangeTemplate<EditingStrategy>;
 template class CORE_TEMPLATE_EXPORT EphemeralRangeTemplate<EditingInFlatTreeStrategy>;
 
 } // namespace blink