third_party/WebKit/Source/core/dom/shadow/ShadowRootRareDataV0.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.
 *     * 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.
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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
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#ifndef ShadowRootRareDataV0_h
#define ShadowRootRareDataV0_h

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

namespace blink {

class ShadowRootRareDataV0 : public GarbageCollected<ShadowRootRareDataV0> {
public:
    ShadowRootRareDataV0()
        : m_descendantShadowElementCount(0)
        , m_descendantContentElementCount(0)
    {
    }

    HTMLShadowElement* shadowInsertionPointOfYoungerShadowRoot() const { return m_shadowInsertionPointOfYoungerShadowRoot.get(); }
    void setShadowInsertionPointOfYoungerShadowRoot(HTMLShadowElement* shadowInsertionPoint) { m_shadowInsertionPointOfYoungerShadowRoot = shadowInsertionPoint; }

    void didAddInsertionPoint(InsertionPoint*);
    void didRemoveInsertionPoint(InsertionPoint*);

    bool containsShadowElements() const { return m_descendantShadowElementCount; }
    bool containsContentElements() const { return m_descendantContentElementCount; }

    unsigned descendantShadowElementCount() const { return m_descendantShadowElementCount; }

    const HeapVector<Member<InsertionPoint>>& descendantInsertionPoints() { return m_descendantInsertionPoints; }
    void setDescendantInsertionPoints(HeapVector<Member<InsertionPoint>>& list) { m_descendantInsertionPoints.swap(list); }
    void clearDescendantInsertionPoints() { m_descendantInsertionPoints.clear(); }

    DEFINE_INLINE_TRACE()
    {
        visitor->trace(m_shadowInsertionPointOfYoungerShadowRoot);
        visitor->trace(m_descendantInsertionPoints);
    }

private:
    Member<HTMLShadowElement> m_shadowInsertionPointOfYoungerShadowRoot;
    unsigned m_descendantShadowElementCount;
    unsigned m_descendantContentElementCount;
    HeapVector<Member<InsertionPoint>> m_descendantInsertionPoints;
};

inline void ShadowRootRareDataV0::didAddInsertionPoint(InsertionPoint* point)
{
    DCHECK(point);
    if (isHTMLShadowElement(*point))
        ++m_descendantShadowElementCount;
    else if (isHTMLContentElement(*point))
        ++m_descendantContentElementCount;
    else
        ASSERT_NOT_REACHED();
}

inline void ShadowRootRareDataV0::didRemoveInsertionPoint(InsertionPoint* point)
{
    DCHECK(point);
    if (isHTMLShadowElement(*point)) {
        DCHECK_GT(m_descendantShadowElementCount, 0u);
        --m_descendantShadowElementCount;
    } else if (isHTMLContentElement(*point)) {
        DCHECK_GT(m_descendantContentElementCount, 0u);
        --m_descendantContentElementCount;
    } else {
        ASSERT_NOT_REACHED();
    }
}

} // namespace blink

#endif