/*
 * Copyright (C) 2010 Adam Barth. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef HTMLSourceTracker_h
#define HTMLSourceTracker_h

#include "HTMLInputStream.h"
#include "HTMLToken.h"
#include <wtf/text/StringBuilder.h>

namespace WebCore {

class HTMLTokenizer;

class HTMLSourceTracker {
    WTF_MAKE_NONCOPYABLE(HTMLSourceTracker);
public:
    HTMLSourceTracker();

    // FIXME: Once we move "end" into HTMLTokenizer, rename "start" to
    // something that makes it obvious that this method can be called multiple
    // times.
    void start(const HTMLInputStream&, HTMLTokenizer*, HTMLToken&);
    void end(const HTMLInputStream&, HTMLTokenizer*, HTMLToken&);

    String sourceForToken(const HTMLToken&);

private:
    SegmentedString m_previousSource;
    SegmentedString m_currentSource;

    String m_cachedSourceForToken;
};

}

#endif
