sky/engine/platform/fonts/Latin1TextIterator.h

/*
 * Copyright (C) 2012 Apple Inc. All rights reserved.
 * 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 SKY_ENGINE_PLATFORM_FONTS_LATIN1TEXTITERATOR_H_
#define SKY_ENGINE_PLATFORM_FONTS_LATIN1TEXTITERATOR_H_

#include "sky/engine/wtf/text/WTFString.h"

namespace blink {

class Latin1TextIterator {
public:
    // The passed in LChar pointer starts at 'currentCharacter'. The iterator operates on the range [currentCharacter, lastCharacter].
    // 'endCharacter' denotes the maximum length of the UChar array, which might exceed 'lastCharacter'.
    Latin1TextIterator(const LChar* characters, int currentCharacter, int lastCharacter, int /*endCharacter*/)
        : m_characters(characters)
        , m_currentCharacter(currentCharacter)
        , m_lastCharacter(lastCharacter)
    {
    }

    bool consume(UChar32& character, unsigned& clusterLength)
    {
        if (m_currentCharacter >= m_lastCharacter)
            return false;

        character = *m_characters;
        clusterLength = 1;
        return true;
    }

    void advance(unsigned advanceLength)
    {
        m_characters += advanceLength;
        m_currentCharacter += advanceLength;
    }

    int currentCharacter() const { return m_currentCharacter; }
    const LChar* characters() const { return m_characters; }

private:
    const LChar* m_characters;
    int m_currentCharacter;
    int m_lastCharacter;
};

} // namespace blink

#endif  // SKY_ENGINE_PLATFORM_FONTS_LATIN1TEXTITERATOR_H_