Source/core/css/RuleFeature.h

/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#ifndef RuleFeature_h
#define RuleFeature_h

#include "wtf/Forward.h"
#include "wtf/HashSet.h"
#include "wtf/text/AtomicStringHash.h"

namespace WebCore {

class StyleRule;
class CSSSelector;
class CSSSelectorList;

struct RuleFeature {
    RuleFeature(StyleRule* rule, unsigned selectorIndex, bool hasDocumentSecurityOrigin)
        : rule(rule)
        , selectorIndex(selectorIndex)
        , hasDocumentSecurityOrigin(hasDocumentSecurityOrigin)
    {
    }
    StyleRule* rule;
    unsigned selectorIndex;
    bool hasDocumentSecurityOrigin;
};

class RuleFeatureSet {
public:
    RuleFeatureSet()
        : m_usesFirstLineRules(false)
    { }

    void add(const RuleFeatureSet&);
    void clear();

    void collectFeaturesFromSelector(const CSSSelector*);

    bool usesSiblingRules() const { return !siblingRules.isEmpty(); }
    bool usesFirstLineRules() const { return m_usesFirstLineRules; }

    inline bool hasSelectorForAttribute(const AtomicString& attributeName) const
    {
        ASSERT(!attributeName.isEmpty());
        return attrsInRules.contains(attributeName);
    }

    inline bool hasSelectorForClass(const AtomicString& classValue) const
    {
        ASSERT(!classValue.isEmpty());
        return classesInRules.contains(classValue);
    }

    inline bool hasSelectorForId(const AtomicString& idValue) const
    {
        ASSERT(!idValue.isEmpty());
        return idsInRules.contains(idValue);
    }

    HashSet<AtomicString> idsInRules;
    HashSet<AtomicString> classesInRules;
    HashSet<AtomicString> attrsInRules;
    Vector<RuleFeature> siblingRules;
    Vector<RuleFeature> uncommonAttributeRules;
private:
    void collectFeaturesFromSelectorList(const CSSSelectorList*);

    bool m_usesFirstLineRules;
};

} // namespace WebCore

#endif // RuleFeature_h