/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
 * Copyright (C) 2013 Igalia S.L. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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 THE COPYRIGHT
 * OWNER 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.
 */

#pragma once

#include <wtf/StdSet.h>

namespace WebCore {

class RenderBox;
class RenderObject;
    
class OrderIterator {
public:
    friend class OrderIteratorPopulator;

    explicit OrderIterator(RenderBox&);

    RenderBox* currentChild() const { return m_currentChild; }
    RenderBox* first();
    RenderBox* next();

    bool shouldSkipChild(const RenderObject&) const;

private:
    void reset();

    RenderBox& m_containerBox;
    RenderBox* m_currentChild;

    using OrderValues = StdSet<int>;
    OrderValues m_orderValues;
    OrderValues::const_iterator m_orderValuesIterator;
    bool m_isReset { false };
};

class OrderIteratorPopulator {
public:
    explicit OrderIteratorPopulator(OrderIterator& iterator)
        : m_iterator(iterator)
    {
        m_iterator.m_orderValues.clear();
    }
    ~OrderIteratorPopulator();

    bool collectChild(const RenderBox&);

private:
    OrderIterator& m_iterator;
};

} // namespace WebCore