Introduce {next,previous}PositionOf() as replacement of {next,previous}() member functions in Positi

Source/core/editing/Editor.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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 1184 matching lines @@
             return nullptr;
 
         RefPtrWillBeRawPtr<Range> rangeObject = Range::create(resultRange.document(), toPositionInDOMTree(resultRange.startPosition()), toPositionInDOMTree(resultRange.endPosition()));
         if (!rangeObject->collapsed())
             return rangeObject.release();
 
         // Found text spans over multiple TreeScopes. Since it's impossible to
         // return such section as a Range, we skip this match and seek for the
         // next occurrence.
         // TODO(yosin) Handle this case.
-        if (forward)
-            searchRange = EphemeralRangeTemplate<Strategy>(resultRange.startPosition().next(), searchRange.endPosition());
-        else
-            searchRange = EphemeralRangeTemplate<Strategy>(searchRange.startPosition(), resultRange.endPosition().previous());
+        if (forward) {
+            // TODO(yosin) We should use |PositionMoveType::Character|
+            // for |nextPositionOf()|.
+            searchRange = EphemeralRangeTemplate<Strategy>(nextPositionOf(resultRange.startPosition(), PositionMoveType::CodePoint), searchRange.endPosition());
+        } else {
+            // TODO(yosin) We should use |PositionMoveType::Character|
+            // for |previousPositionOf()|.
+            searchRange = EphemeralRangeTemplate<Strategy>(searchRange.startPosition(), previousPositionOf(resultRange.endPosition(), PositionMoveType::CodePoint));
+        }
     }
 
     ASSERT_NOT_REACHED();
     return nullptr;
 }
 
 template <typename Strategy>
 static PassRefPtrWillBeRawPtr<Range> findRangeOfStringAlgorithm(Document& document, const String& target, const EphemeralRangeTemplate<Strategy>& referenceRange, FindOptions options)
 {
     if (target.isEmpty())
@@ skipping 77 matching lines @@
 }
 
 DEFINE_TRACE(Editor)
 {
     visitor->trace(m_frame);
     visitor->trace(m_lastEditCommand);
     visitor->trace(m_mark);
 }
 
 } // namespace blink