Source/core/dom/StyleTreeScopeTracker.h

/*
 * 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
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef StyleTreeScopeTracker_h
#define StyleTreeScopeTracker_h

#include "wtf/ListHashSet.h"

namespace WebCore {

class Document;
class TreeScope;

class StyleTreeScopeTracker {
public:
    typedef ListHashSet<TreeScope*, 16> TreeScopeSet;

    explicit StyleTreeScopeTracker(Document&);

    void mark(TreeScope&);
    void markDocument();
    bool isSubscopeMarked() const { return m_set.isEmpty(); }
    bool isDocumentMarked() const { return m_isDocumentMarked; }
    void clear();
    TreeScopeSet& subscope() { return m_set; }

private:
    Document& m_document;
    bool m_isDocumentMarked;
    TreeScopeSet m_set;
};

}

#endif