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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 "CommonAtomStrings.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;
// FIXME: Has* values should be separated so we could describe both the :has() argument and its position in the selector.
enum class MatchElement : uint8_t {
Subject,
Parent,
Ancestor,
DirectSibling,
IndirectSibling,
AnySibling,
ParentSibling,
AncestorSibling,
HasChild,
HasDescendant,
HasSibling,
HasSiblingDescendant,
HasNonSubjectOrScopeBreaking, // FIXME: This is a catch-all for cases where :has() is in a non-subject position, or may break scope.
Host
};
constexpr unsigned matchElementCount = static_cast<unsigned>(MatchElement::Host) + 1;
enum class IsNegation : bool { No, Yes };
enum class CanBreakScope : bool { No, Yes }; // :is/not() inside scoped selector can be affected by things outside the scope.
// For MSVC.
#pragma pack(push, 4)
struct RuleAndSelector {
RuleAndSelector(const RuleData&);
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.
};
struct RuleFeature : public RuleAndSelector {
RuleFeature(const RuleData&, MatchElement, IsNegation);
MatchElement matchElement;
IsNegation isNegation; // Whether the selector is in a (non-paired) :not() context.
};
static_assert(sizeof(RuleFeature) <= 16, "RuleFeature is a frequently allocated object. Keep it small.");
struct RuleFeatureWithInvalidationSelector : public RuleFeature {
RuleFeatureWithInvalidationSelector(const RuleData&, MatchElement, IsNegation, const CSSSelector* invalidationSelector);
const CSSSelector* invalidationSelector { nullptr };
};
#pragma pack(pop)
using PseudoClassInvalidationKey = std::tuple<unsigned, uint8_t, AtomString>;
using RuleFeatureVector = Vector<RuleFeature>;
struct RuleFeatureSet {
void add(const RuleFeatureSet&);
void clear();
void shrinkToFit();
void collectFeatures(const RuleData&);
void registerContentAttribute(const AtomString&);
bool usesHasPseudoClass() const;
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> attributeLowercaseLocalNamesInRules;
HashSet<AtomString> attributeLocalNamesInRules;
HashSet<AtomString> contentAttributeNamesInRules;
Vector<RuleAndSelector> siblingRules;
Vector<RuleAndSelector> uncommonAttributeRules;
HashMap<AtomString, std::unique_ptr<RuleFeatureVector>> idRules;
HashMap<AtomString, std::unique_ptr<RuleFeatureVector>> classRules;
HashMap<AtomString, std::unique_ptr<Vector<RuleFeatureWithInvalidationSelector>>> attributeRules;
HashMap<PseudoClassInvalidationKey, std::unique_ptr<RuleFeatureVector>> pseudoClassRules;
HashMap<PseudoClassInvalidationKey, std::unique_ptr<Vector<RuleFeatureWithInvalidationSelector>>> hasPseudoClassRules;
HashSet<AtomString> classesAffectingHost;
HashSet<AtomString> attributesAffectingHost;
HashSet<CSSSelector::PseudoClassType, IntHash<CSSSelector::PseudoClassType>, WTF::StrongEnumHashTraits<CSSSelector::PseudoClassType>> pseudoClassesAffectingHost;
HashSet<CSSSelector::PseudoClassType, IntHash<CSSSelector::PseudoClassType>, WTF::StrongEnumHashTraits<CSSSelector::PseudoClassType>> pseudoClassTypes;
std::array<bool, matchElementCount> usedMatchElements { };
bool usesFirstLineRules { false };
bool usesFirstLetterRules { false };
private:
struct SelectorFeatures {
bool hasSiblingSelector { false };
using InvalidationFeature = std::tuple<const CSSSelector*, MatchElement, IsNegation>;
Vector<InvalidationFeature> ids;
Vector<InvalidationFeature> classes;
Vector<InvalidationFeature> attributes;
Vector<InvalidationFeature> pseudoClasses;
Vector<InvalidationFeature> hasPseudoClasses;
};
void recursivelyCollectFeaturesFromSelector(SelectorFeatures&, const CSSSelector&, MatchElement = MatchElement::Subject, IsNegation = IsNegation::No, CanBreakScope = CanBreakScope::No);
};
bool isHasPseudoClassMatchElement(MatchElement);
MatchElement computeHasPseudoClassMatchElement(const CSSSelector&);
enum class InvalidationKeyType : uint8_t { Universal = 1, Class, Id, Tag };
PseudoClassInvalidationKey makePseudoClassInvalidationKey(CSSSelector::PseudoClassType, InvalidationKeyType, const AtomString& = starAtom());
inline bool isUniversalInvalidation(const PseudoClassInvalidationKey& key)
{
return static_cast<InvalidationKeyType>(std::get<1>(key)) == InvalidationKeyType::Universal;
}
inline bool RuleFeatureSet::usesHasPseudoClass() const
{
return usesMatchElement(MatchElement::HasChild)
|| usesMatchElement(MatchElement::HasDescendant)
|| usesMatchElement(MatchElement::HasSiblingDescendant)
|| usesMatchElement(MatchElement::HasSibling)
|| usesMatchElement(MatchElement::HasNonSubjectOrScopeBreaking);
}
} // namespace Style
} // namespace WebCore
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