Source/core/dom/shadow/ContentDistribution.cpp

/*
 * Copyright (C) 2013 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
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 *
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 * 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,
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#include "config.h"
#include "core/dom/shadow/ContentDistribution.h"

#include "core/dom/shadow/InsertionPoint.h"

namespace WebCore {

void ContentDistribution::swap(ContentDistribution& other)
{
    m_nodes.swap(other.m_nodes);
    m_indices.swap(other.m_indices);
}

void ContentDistribution::append(PassRefPtr<Node> node)
{
    ASSERT(node);
    ASSERT(!isActiveInsertionPoint(*node));
    size_t size = m_nodes.size();
    m_indices.set(node.get(), size);
    m_nodes.append(node);
}

size_t ContentDistribution::find(const Node* node) const
{
    HashMap<const Node*, size_t>::const_iterator it = m_indices.find(node);
    if (it == m_indices.end())
        return kNotFound;

    return it.get()->value;
}

Node* ContentDistribution::nextTo(const Node* node) const
{
    size_t index = find(node);
    if (index == kNotFound || index + 1 == size())
        return 0;
    return at(index + 1).get();
}

Node* ContentDistribution::previousTo(const Node* node) const
{
    size_t index = find(node);
    if (index == kNotFound || !index)
        return 0;
    return at(index - 1).get();
}

} // namespace WebCore