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      1 /*
      2  * Copyright (C) 2012 Apple Inc. All rights reserved.
      3  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
      4  *
      5  * This library is free software; you can redistribute it and/or
      6  * modify it under the terms of the GNU Library General Public
      7  * License as published by the Free Software Foundation; either
      8  * version 2 of the License, or (at your option) any later version.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Library General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Library General Public License
     16  * along with this library; see the file COPYING.LIB.  If not, write to
     17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  *
     20  */
     21 
     22 #ifndef Latin1TextIterator_h
     23 #define Latin1TextIterator_h
     24 
     25 #include "wtf/text/WTFString.h"
     26 
     27 namespace WebCore {
     28 
     29 class Latin1TextIterator {
     30 public:
     31     // The passed in LChar pointer starts at 'currentCharacter'. The iterator operates on the range [currentCharacter, lastCharacter].
     32     // 'endCharacter' denotes the maximum length of the UChar array, which might exceed 'lastCharacter'.
     33     Latin1TextIterator(const LChar* characters, int currentCharacter, int lastCharacter, int /*endCharacter*/)
     34         : m_characters(characters)
     35         , m_currentCharacter(currentCharacter)
     36         , m_lastCharacter(lastCharacter)
     37     {
     38     }
     39 
     40     bool consume(UChar32& character, unsigned& clusterLength)
     41     {
     42         if (m_currentCharacter >= m_lastCharacter)
     43             return false;
     44 
     45         character = *m_characters;
     46         clusterLength = 1;
     47         return true;
     48     }
     49 
     50     void advance(unsigned advanceLength)
     51     {
     52         m_characters += advanceLength;
     53         m_currentCharacter += advanceLength;
     54     }
     55 
     56     int currentCharacter() const { return m_currentCharacter; }
     57     const LChar* characters() const { return m_characters; }
     58 
     59 private:
     60     const LChar* m_characters;
     61     int m_currentCharacter;
     62     int m_lastCharacter;
     63 };
     64 
     65 }
     66 
     67 #endif
     68