Move LayoutObject::nextOffset/previousOffset() to editing utility

third_party/WebKit/Source/core/layout/LayoutText.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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 1638 matching lines @@
 }
 
 unsigned LayoutText::resolvedTextLength() const
 {
     int len = 0;
     for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox())
         len += box->len();
     return len;
 }
 
-int LayoutText::previousOffset(int current) const
-{
-    if (m_text.is8Bit())
-        return current - 1;
-
-    StringImpl* textImpl = m_text.impl();
-    TextBreakIterator* iterator = cursorMovementIterator(textImpl->characters16(), textImpl->length());
-    if (!iterator)
-        return current - 1;
-
-    long result = iterator->preceding(current);
-    if (result == TextBreakDone)
-        result = current - 1;
-
-
-    return result;
-}
-
 int LayoutText::previousOffsetForBackwardDeletion(int current) const
 {
     // Delete by one code point. Ideally we should delete grapheme where that
     // makes sense. https://crbug.com/587241
     if (U16_IS_TRAIL(m_text[--current]))
         --current;
     if (current < 0)
         current = 0;
     return current;
 }
 
-int LayoutText::nextOffset(int current) const
-{
-    if (m_text.is8Bit())
-        return current + 1;
-
-    StringImpl* textImpl = m_text.impl();
-    TextBreakIterator* iterator = cursorMovementIterator(textImpl->characters16(), textImpl->length());
-    if (!iterator)
-        return current + 1;
-
-    long result = iterator->following(current);
-    if (result == TextBreakDone)
-        result = current + 1;
-
-    return result;
-}
-
 bool LayoutText::computeCanUseSimpleFontCodePath() const
 {
     if (m_text.is8Bit())
         return true;
     return Character::characterRangeCodePath(characters16(), length()) == SimplePath;
 }
 
 #if ENABLE(ASSERT)
 
 void LayoutText::checkConsistency() const
@@ skipping 36 matching lines @@
     for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) {
         paintInvalidationContainer.invalidateDisplayItemClientOnBacking(*box, invalidationReason);
         if (box->truncation() != cNoTruncation) {
             if (EllipsisBox* ellipsisBox = box->root().ellipsisBox())
                 paintInvalidationContainer.invalidateDisplayItemClientOnBacking(*ellipsisBox, invalidationReason);
         }
     }
 }
 
 } // namespace blink