text: /*
   * Copyright (C) 2011 Google Inc. 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.
   */
  
  #include "config.h"
  #include "core/layout/OrderIterator.h"
  
  #include "core/layout/LayoutBox.h"
  
  namespace blink {
  
  OrderIterator::OrderIterator(const LayoutBox* containerBox)
      : m_containerBox(containerBox)
      , m_currentChild(nullptr)
      , m_isReset(false)
  {
  }
  
  LayoutBox* OrderIterator::first()
  {
      reset();
      return next();
  }
  
  LayoutBox* OrderIterator::next()
  {
      do {
          if (!m_currentChild) {
              if (m_orderValuesIterator == m_orderValues.end())
                  return nullptr;
  
              if (!m_isReset) {
                  ++m_orderValuesIterator;
                  if (m_orderValuesIterator == m_orderValues.end())
                      return nullptr;
              } else {
                  m_isReset = false;
              }
  
              m_currentChild = m_containerBox->firstChildBox();
          } else {
              m_currentChild = m_currentChild->nextSiblingBox();
          }
      } while (!m_currentChild || m_currentChild->style()->order() != *m_orderValuesIterator);
  
      return m_currentChild;
  }
  
  void OrderIterator::reset()
  {
      m_currentChild = nullptr;
      m_orderValuesIterator = m_orderValues.begin();
      m_isReset = true;
  }
  
  OrderIteratorPopulator::~OrderIteratorPopulator()
  {
      m_iterator.reset();
  }
  
  void OrderIteratorPopulator::collectChild(const LayoutBox* child)
  {
      m_iterator.m_orderValues.insert(child->style()->order());
  }
  
  } // namespace blink
  