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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* Copyright (C) 2003-2011, 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.
*
*/
#pragma once
#include "CSSSelector.h"
#include <wtf/Forward.h>
#include <wtf/HashMap.h>
#include <wtf/HashSet.h>
#include <wtf/text/AtomString.h>
#include <wtf/text/AtomStringHash.h>
namespace WebCore {
class StyleRule;
namespace Style {
class RuleData;
enum class MatchElement : uint8_t { Subject, Parent, Ancestor, DirectSibling, IndirectSibling, AnySibling, ParentSibling, AncestorSibling, Host };
constexpr unsigned matchElementCount = static_cast<unsigned>(MatchElement::Host) + 1;
struct RuleFeature {
RuleFeature(const RuleData&, Optional<MatchElement> = WTF::nullopt);
RefPtr<const StyleRule> styleRule;
uint16_t selectorIndex; // Keep in sync with RuleData's selectorIndex size.
uint16_t selectorListIndex; // Keep in sync with RuleData's selectorListIndex size.
Optional<MatchElement> matchElement { };
};
static_assert(sizeof(RuleFeature) <= 16, "RuleFeature is a frquently alocated object. Keep it small.");
struct RuleFeatureWithInvalidationSelector : public RuleFeature {
RuleFeatureWithInvalidationSelector(const RuleData& data, Optional<MatchElement> matchElement = WTF::nullopt, const CSSSelector* invalidationSelector = nullptr)
: RuleFeature(data, WTFMove(matchElement))
, invalidationSelector(invalidationSelector)
{ }
const CSSSelector* invalidationSelector { nullptr };
};
struct RuleFeatureSet {
void add(const RuleFeatureSet&);
void clear();
void shrinkToFit();
void collectFeatures(const RuleData&);
void registerContentAttribute(const AtomString&);
HashSet<AtomString> idsInRules;
HashSet<AtomString> idsMatchingAncestorsInRules;
HashSet<AtomString> attributeCanonicalLocalNamesInRules;
HashSet<AtomString> attributeLocalNamesInRules;
HashSet<AtomString> contentAttributeNamesInRules;
Vector<RuleFeature> siblingRules;
Vector<RuleFeature> uncommonAttributeRules;
HashMap<AtomString, std::unique_ptr<Vector<RuleFeature>>> classRules;
HashMap<AtomString, std::unique_ptr<Vector<RuleFeatureWithInvalidationSelector>>> attributeRules;
HashSet<AtomString> classesAffectingHost;
HashSet<AtomString> attributesAffectingHost;
bool usesFirstLineRules { false };
bool usesFirstLetterRules { false };
private:
static MatchElement computeNextMatchElement(MatchElement, CSSSelector::RelationType);
static MatchElement computeSubSelectorMatchElement(MatchElement, const CSSSelector&);
struct SelectorFeatures {
bool hasSiblingSelector { false };
Vector<std::pair<AtomString, MatchElement>, 32> classes;
Vector<std::pair<const CSSSelector*, MatchElement>, 32> attributes;
};
void recursivelyCollectFeaturesFromSelector(SelectorFeatures&, const CSSSelector&, MatchElement = MatchElement::Subject);
};
} // namespace Style
} // namespace WebCore