71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
/*
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* Copyright (C) Research In Motion Limited 2011. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef SurrogatePairAwareTextIterator_h
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#define SurrogatePairAwareTextIterator_h
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#include <wtf/unicode/CharacterNames.h>
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#include <wtf/text/WTFString.h>
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namespace WebCore {
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class SurrogatePairAwareTextIterator {
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public:
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// The passed in UChar pointer starts at 'currentIndex'. The iterator operatoes on the range [currentIndex, lastIndex].
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// 'endIndex' denotes the maximum length of the UChar array, which might exceed 'lastIndex'.
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SurrogatePairAwareTextIterator(const UChar*, unsigned currentIndex, unsigned lastIndex, unsigned endIndex);
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inline bool consume(UChar32& character, unsigned& clusterLength)
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{
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if (m_currentIndex >= m_lastIndex)
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return false;
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character = *m_characters;
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clusterLength = 1;
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if (!U16_IS_SURROGATE(character))
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return true;
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return consumeSlowCase(character, clusterLength);
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}
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void advance(unsigned advanceLength)
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{
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m_characters += advanceLength;
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m_currentIndex += advanceLength;
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}
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unsigned currentIndex() const { return m_currentIndex; }
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const UChar* characters() const { return m_characters; }
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private:
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bool consumeSlowCase(UChar32&, unsigned&);
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UChar32 normalizeVoicingMarks();
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const UChar* m_characters;
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unsigned m_currentIndex;
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unsigned m_lastIndex;
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unsigned m_endIndex;
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};
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}
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#endif
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