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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, HasChild, HasDescendant, HasSibling, Host };
constexpr unsigned matchElementCount = static_cast<unsigned>(MatchElement::Host) + 1;
struct RuleFeature {
RuleFeature(const RuleData&, std::optional<MatchElement> = std::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.
std::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, std::optional<MatchElement> matchElement = std::nullopt, const CSSSelector* invalidationSelector = nullptr)
: RuleFeature(data, WTFMove(matchElement))
, invalidationSelector(invalidationSelector)
{ }
const CSSSelector* invalidationSelector { nullptr };
};
using RuleFeatureVector = Vector<RuleFeature>;
struct RuleFeatureSet {
void add(const RuleFeatureSet&);
void clear();
void shrinkToFit();
void collectFeatures(const RuleData&);
void registerContentAttribute(const AtomString&);
bool usesMatchElement(MatchElement matchElement) const { return usedMatchElements[static_cast<uint8_t>(matchElement)]; }
void setUsesMatchElement(MatchElement matchElement) { usedMatchElements[static_cast<uint8_t>(matchElement)] = true; }
HashSet<AtomString> idsInRules;
HashSet<AtomString> idsMatchingAncestorsInRules;
HashSet<AtomString> attributeCanonicalLocalNamesInRules;
HashSet<AtomString> attributeLocalNamesInRules;
HashSet<AtomString> contentAttributeNamesInRules;
RuleFeatureVector siblingRules;
RuleFeatureVector uncommonAttributeRules;
HashMap<AtomString, std::unique_ptr<RuleFeatureVector>> tagRules;
HashMap<AtomString, std::unique_ptr<RuleFeatureVector>> classRules;
HashMap<AtomString, std::unique_ptr<Vector<RuleFeatureWithInvalidationSelector>>> attributeRules;
HashMap<CSSSelector::PseudoClassType, std::unique_ptr<RuleFeatureVector>, IntHash<CSSSelector::PseudoClassType>, WTF::StrongEnumHashTraits<CSSSelector::PseudoClassType>> pseudoClassRules;
HashSet<AtomString> classesAffectingHost;
HashSet<AtomString> attributesAffectingHost;
HashSet<CSSSelector::PseudoClassType, IntHash<CSSSelector::PseudoClassType>, WTF::StrongEnumHashTraits<CSSSelector::PseudoClassType>> pseudoClassesAffectingHost;
std::array<bool, matchElementCount> usedMatchElements;
bool usesFirstLineRules { false };
bool usesFirstLetterRules { false };
private:
struct SelectorFeatures {
bool hasSiblingSelector { false };
Vector<std::pair<AtomString, MatchElement>, 32> tags;
Vector<std::pair<AtomString, MatchElement>, 32> classes;
Vector<std::pair<const CSSSelector*, MatchElement>, 32> attributes;
Vector<std::pair<CSSSelector::PseudoClassType, MatchElement>, 32> pseudoClasses;
};
void recursivelyCollectFeaturesFromSelector(SelectorFeatures&, const CSSSelector&, MatchElement = MatchElement::Subject);
};
bool isHasPseudoClassMatchElement(MatchElement);
MatchElement computeHasPseudoClassMatchElement(const CSSSelector&);
} // namespace Style
} // namespace WebCore