Source/core/rendering/line/LineBreaker.h

/*
 * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
 * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
 * Copyright (C) 2010 Google Inc. 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 LineBreaker_h
#define LineBreaker_h

#include "core/rendering/InlineIterator.h"
#include "core/rendering/line/LineInfo.h"
#include "platform/text/TextBreakIterator.h"
#include "wtf/Vector.h"

namespace WebCore {

enum WhitespacePosition { LeadingWhitespace, TrailingWhitespace };

class RenderText;

struct RenderTextInfo {
    RenderTextInfo();
    ~RenderTextInfo();

    RenderText* m_text;
    LazyLineBreakIterator m_lineBreakIterator;
    const Font* m_font;
};

class LineBreaker {
public:
    friend class BreakingContext;
    LineBreaker(RenderBlockFlow* block)
        : m_block(block)
    {
        reset();
    }

    InlineIterator nextLineBreak(InlineBidiResolver&, LineInfo&, RenderTextInfo&, FloatingObject* lastFloatFromPreviousLine, unsigned consecutiveHyphenatedLines, WordMeasurements&);

    bool lineWasHyphenated() { return m_hyphenated; }
    const Vector<RenderBox*>& positionedObjects() { return m_positionedObjects; }
    EClear clear() { return m_clear; }
private:
    void reset();

    InlineIterator nextSegmentBreak(InlineBidiResolver&, LineInfo&, RenderTextInfo&, FloatingObject* lastFloatFromPreviousLine, unsigned consecutiveHyphenatedLines, WordMeasurements&);
    void skipLeadingWhitespace(InlineBidiResolver&, LineInfo&, FloatingObject* lastFloatFromPreviousLine, LineWidth&);

    RenderBlockFlow* m_block;
    bool m_hyphenated;
    EClear m_clear;
    Vector<RenderBox*> m_positionedObjects;
};

}

#endif // LineBreaker_h