Source/WebCore/css/ElementRuleCollector.h

/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2013, 2014 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 ElementRuleCollector_h
#define ElementRuleCollector_h

#include "MediaQueryEvaluator.h"
#include "SelectorChecker.h"
#include "StyleResolver.h"
#include <memory>
#include <wtf/RefPtr.h>
#include <wtf/Vector.h>

namespace WebCore {

class DocumentRuleSets;
class MatchRequest;
class RenderRegion;
class RuleData;
class RuleSet;
class SelectorFilter;

struct MatchedRule {
    const RuleData* ruleData;
    unsigned specificity;
};

class ElementRuleCollector {
public:
    ElementRuleCollector(Element& element, RenderStyle* style, const DocumentRuleSets& ruleSets, const SelectorFilter& selectorFilter)
        : m_element(element)
        , m_style(style)
        , m_ruleSets(ruleSets)
        , m_selectorFilter(selectorFilter)
        , m_isPrintStyle(false)
        , m_regionForStyling(nullptr)
        , m_pseudoStyleRequest(NOPSEUDO)
        , m_sameOriginOnly(false)
        , m_mode(SelectorChecker::Mode::ResolvingStyle)
        , m_canUseFastReject(m_selectorFilter.parentStackIsConsistent(element.parentNode()))
    {
    }

    void matchAllRules(bool matchAuthorAndUserStyles, bool includeSMILProperties);
    void matchUARules();
    void matchAuthorRules(bool includeEmptyRules);
    void matchUserRules(bool includeEmptyRules);

    void setMode(SelectorChecker::Mode mode) { m_mode = mode; }
    void setPseudoStyleRequest(const PseudoStyleRequest& request) { m_pseudoStyleRequest = request; }
    void setSameOriginOnly(bool f) { m_sameOriginOnly = f; } 
    void setRegionForStyling(const RenderRegion* regionForStyling) { m_regionForStyling = regionForStyling; }
    void setMedium(const MediaQueryEvaluator* medium) { m_isPrintStyle = medium->mediaTypeMatchSpecific("print"); }

    bool hasAnyMatchingRules(RuleSet*);

    StyleResolver::MatchResult& matchedResult();
    const Vector<RefPtr<StyleRule>>& matchedRuleList() const;

    bool hasMatchedRules() const { return m_matchedRules && !m_matchedRules->isEmpty(); }
    void clearMatchedRules();

private:
    void addElementStyleProperties(const StyleProperties*, bool isCacheable = true);

    void matchUARules(RuleSet*);

    void collectMatchingRules(const MatchRequest&, StyleResolver::RuleRange&);
    void collectMatchingRulesForRegion(const MatchRequest&, StyleResolver::RuleRange&);
    void collectMatchingRulesForList(const RuleSet::RuleDataVector*, const MatchRequest&, StyleResolver::RuleRange&);
    bool ruleMatches(const RuleData&, unsigned &specificity);

    void sortMatchedRules();
    void sortAndTransferMatchedRules();

    void addMatchedRule(const MatchedRule&);

    Element& m_element;
    RenderStyle* m_style;
    const DocumentRuleSets& m_ruleSets;
    const SelectorFilter& m_selectorFilter;

    bool m_isPrintStyle;
    const RenderRegion* m_regionForStyling;
    PseudoStyleRequest m_pseudoStyleRequest;
    bool m_sameOriginOnly;
    SelectorChecker::Mode m_mode;
    bool m_canUseFastReject;

    std::unique_ptr<Vector<MatchedRule, 32>> m_matchedRules;

    // Output.
    Vector<RefPtr<StyleRule>> m_matchedRuleList;
    StyleResolver::MatchResult m_result;
};

} // namespace WebCore

#endif // ElementRuleCollector_h