2 * Copyright (C) Research In Motion Limited 2011. All rights reserved.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB. If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
21 #ifndef SurrogatePairAwareTextIterator_h
22 #define SurrogatePairAwareTextIterator_h
24 #include "platform/PlatformExport.h"
25 #include "wtf/text/WTFString.h"
26 #include "wtf/unicode/CharacterNames.h"
30 class PLATFORM_EXPORT SurrogatePairAwareTextIterator {
32 // The passed in UChar pointer starts at 'currentCharacter'. The iterator operatoes on the range [currentCharacter, lastCharacter].
33 // 'endCharacter' denotes the maximum length of the UChar array, which might exceed 'lastCharacter'.
34 SurrogatePairAwareTextIterator(const UChar*, int currentCharacter, int lastCharacter, int endCharacter);
36 inline bool consume(UChar32& character, unsigned& clusterLength)
38 if (m_currentCharacter >= m_lastCharacter)
41 character = *m_characters;
44 if (character < HiraganaLetterSmallA)
47 return consumeSlowCase(character, clusterLength);
50 void advance(unsigned advanceLength)
52 m_characters += advanceLength;
53 m_currentCharacter += advanceLength;
56 int currentCharacter() const { return m_currentCharacter; }
57 const UChar* characters() const { return m_characters; }
60 bool consumeSlowCase(UChar32&, unsigned&);
61 UChar32 normalizeVoicingMarks();
63 const UChar* m_characters;
64 int m_currentCharacter;