Source/WebCore/css/CSSSelectorList.h

/*
 * Copyright (C) 2008, 2014 Apple 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:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include "CSSSelector.h"
#include <memory>

namespace WebCore {

class CSSParserSelector;

class CSSSelectorList {
    WTF_MAKE_FAST_ALLOCATED;
public:
    CSSSelectorList() : m_selectorArray(0) { }
    CSSSelectorList(const CSSSelectorList&);
    CSSSelectorList(CSSSelectorList&&);

    ~CSSSelectorList() { deleteSelectors(); }

    void adoptSelectorVector(Vector<std::unique_ptr<CSSParserSelector>>& selectorVector);
    void adoptSelectorArray(CSSSelector* selectors) { ASSERT(!m_selectorArray); m_selectorArray = selectors; }

    bool isValid() const { return !!m_selectorArray; }
    const CSSSelector* first() const { return m_selectorArray; }
    static const CSSSelector* next(const CSSSelector*);
    bool hasOneSelector() const { return m_selectorArray && !next(m_selectorArray); }
    const CSSSelector* selectorAt(size_t index) const { return &m_selectorArray[index]; }

    size_t indexOfNextSelectorAfter(size_t index) const
    {
        const CSSSelector* current = selectorAt(index);
        current = next(current);
        if (!current)
            return notFound;
        return current - m_selectorArray;
    }

    bool selectorsNeedNamespaceResolution();
    bool hasInvalidSelector() const;

    String selectorsText() const;
    void buildSelectorsText(StringBuilder&) const;

    unsigned componentCount() const;
    unsigned listSize() const;

    CSSSelectorList& operator=(CSSSelectorList&&);

private:
    void deleteSelectors();

    // End of a multipart selector is indicated by m_isLastInTagHistory bit in the last item.
    // End of the array is indicated by m_isLastInSelectorList bit in the last item.
    CSSSelector* m_selectorArray;
};

inline const CSSSelector* CSSSelectorList::next(const CSSSelector* current)
{
    // Skip subparts of compound selectors.
    while (!current->isLastInTagHistory())
        current++;
    return current->isLastInSelectorList() ? 0 : current + 1;
}

} // namespace WebCore