third_party/WebKit/Source/core/html/HTMLContentElement.h

/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
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 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
 *
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#ifndef HTMLContentElement_h
#define HTMLContentElement_h

#include "core/CoreExport.h"
#include "core/css/CSSSelectorList.h"
#include "core/dom/shadow/InsertionPoint.h"
#include "platform/heap/Handle.h"

namespace blink {

class HTMLContentSelectFilter : public NoBaseWillBeGarbageCollectedFinalized<HTMLContentSelectFilter> {
    USING_FAST_MALLOC_WILL_BE_REMOVED(HTMLContentSelectFilter);
public:
    virtual ~HTMLContentSelectFilter() { }
    virtual bool canSelectNode(const WillBeHeapVector<RawPtrWillBeMember<Node>, 32>& siblings, int nth) const = 0;

    DEFINE_INLINE_VIRTUAL_TRACE() { }
};

class CORE_EXPORT HTMLContentElement final : public InsertionPoint {
    DEFINE_WRAPPERTYPEINFO();
public:
    static PassRefPtrWillBeRawPtr<HTMLContentElement> create(Document&, PassOwnPtrWillBeRawPtr<HTMLContentSelectFilter> = nullptr);
    ~HTMLContentElement() override;

    bool canAffectSelector() const override { return true; }

    bool canSelectNode(const WillBeHeapVector<RawPtrWillBeMember<Node>, 32>& siblings, int nth) const;

    const CSSSelectorList& selectorList() const;
    bool isSelectValid() const;

    DECLARE_VIRTUAL_TRACE();

private:
    HTMLContentElement(Document&, PassOwnPtrWillBeRawPtr<HTMLContentSelectFilter>);

    void parseAttribute(const QualifiedName&, const AtomicString&) override;

    bool validateSelect() const;
    void parseSelect();

    bool matchSelector(Element&) const;

    bool m_shouldParseSelect;
    bool m_isValidSelector;
    AtomicString m_select;
    CSSSelectorList m_selectorList;
    OwnPtrWillBeMember<HTMLContentSelectFilter> m_filter;
};

inline const CSSSelectorList& HTMLContentElement::selectorList() const
{
    if (m_shouldParseSelect)
        const_cast<HTMLContentElement*>(this)->parseSelect();
    return m_selectorList;
}

inline bool HTMLContentElement::isSelectValid() const
{
    if (m_shouldParseSelect)
        const_cast<HTMLContentElement*>(this)->parseSelect();
    return m_isValidSelector;
}

inline bool HTMLContentElement::canSelectNode(const WillBeHeapVector<RawPtrWillBeMember<Node>, 32>& siblings, int nth) const
{
    if (m_filter)
        return m_filter->canSelectNode(siblings, nth);
    if (m_select.isNull() || m_select.isEmpty())
        return true;
    if (!isSelectValid())
        return false;
    if (!siblings[nth]->isElementNode())
        return false;
    return matchSelector(*toElement(siblings[nth]));
}

} // namespace blink

#endif // HTMLContentElement_h