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/*
* Copyright (C) Research In Motion Limited 2011. All rights reserved.
*
* 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
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef SurrogatePairAwareTextIterator_h
#define SurrogatePairAwareTextIterator_h
#include <wtf/unicode/CharacterNames.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
class SurrogatePairAwareTextIterator {
public:
// The passed in UChar pointer starts at 'currentCharacter'. The iterator operatoes on the range [currentCharacter, lastCharacter].
// 'endCharacter' denotes the maximum length of the UChar array, which might exceed 'lastCharacter'.
SurrogatePairAwareTextIterator(const UChar*, int currentCharacter, int lastCharacter, int endCharacter);
inline bool consume(UChar32& character, unsigned& clusterLength)
{
if (m_currentCharacter >= m_lastCharacter)
return false;
character = *m_characters;
clusterLength = 1;
if (character < HiraganaLetterSmallA)
return true;
return consumeSlowCase(character, clusterLength);
}
void advance(unsigned advanceLength)
{
m_characters += advanceLength;
m_currentCharacter += advanceLength;
}
int currentCharacter() const { return m_currentCharacter; }
const UChar* characters() const { return m_characters; }
private:
bool consumeSlowCase(UChar32&, unsigned&);
UChar32 normalizeVoicingMarks();
const UChar* m_characters;
int m_currentCharacter;
int m_lastCharacter;
int m_endCharacter;
};
}
#endif