| /* |
| * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com) |
| * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com) |
| * Copyright (C) 2005-2018 Apple Inc. All rights reserved. |
| * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org> |
| * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org> |
| * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/) |
| * Copyright (c) 2011, Code Aurora Forum. All rights reserved. |
| * Copyright (C) Research In Motion Limited 2011. All rights reserved. |
| * Copyright (C) 2012 Google 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. |
| */ |
| |
| #include "config.h" |
| #include "ElementRuleCollector.h" |
| |
| #include "CSSRuleList.h" |
| #include "CSSSelector.h" |
| #include "CSSValueKeywords.h" |
| #include "HTMLElement.h" |
| #include "HTMLSlotElement.h" |
| #include "SVGElement.h" |
| #include "SelectorCompiler.h" |
| #include "SelectorFilter.h" |
| #include "ShadowRoot.h" |
| #include "StyleProperties.h" |
| #include "StyleResolver.h" |
| #include "StyleScope.h" |
| #include "StyleScopeRuleSets.h" |
| #include "StyledElement.h" |
| #include "UserAgentStyle.h" |
| #include <wtf/SetForScope.h> |
| |
| namespace WebCore { |
| namespace Style { |
| |
| static const StyleProperties& leftToRightDeclaration() |
| { |
| static auto& declaration = [] () -> const StyleProperties& { |
| auto properties = MutableStyleProperties::create(); |
| properties->setProperty(CSSPropertyDirection, CSSValueLtr); |
| return properties.leakRef(); |
| }(); |
| return declaration; |
| } |
| |
| static const StyleProperties& rightToLeftDeclaration() |
| { |
| static auto& declaration = [] () -> const StyleProperties& { |
| auto properties = MutableStyleProperties::create(); |
| properties->setProperty(CSSPropertyDirection, CSSValueRtl); |
| return properties.leakRef(); |
| }(); |
| return declaration; |
| } |
| |
| class MatchRequest { |
| public: |
| MatchRequest(const RuleSet* ruleSet, ScopeOrdinal styleScopeOrdinal = ScopeOrdinal::Element) |
| : ruleSet(ruleSet) |
| , styleScopeOrdinal(styleScopeOrdinal) |
| { |
| } |
| const RuleSet* ruleSet; |
| ScopeOrdinal styleScopeOrdinal; |
| }; |
| |
| ElementRuleCollector::ElementRuleCollector(const Element& element, const ScopeRuleSets& ruleSets, const SelectorFilter* selectorFilter) |
| : m_element(element) |
| , m_authorStyle(ruleSets.authorStyle()) |
| , m_userStyle(ruleSets.userStyle()) |
| , m_userAgentMediaQueryStyle(ruleSets.userAgentMediaQueryStyle()) |
| , m_selectorFilter(selectorFilter) |
| { |
| ASSERT(!m_selectorFilter || m_selectorFilter->parentStackIsConsistent(element.parentNode())); |
| } |
| |
| ElementRuleCollector::ElementRuleCollector(const Element& element, const RuleSet& authorStyle, const SelectorFilter* selectorFilter) |
| : m_element(element) |
| , m_authorStyle(authorStyle) |
| , m_selectorFilter(selectorFilter) |
| { |
| ASSERT(!m_selectorFilter || m_selectorFilter->parentStackIsConsistent(element.parentNode())); |
| } |
| |
| const MatchResult& ElementRuleCollector::matchResult() const |
| { |
| ASSERT(m_mode == SelectorChecker::Mode::ResolvingStyle); |
| return m_result; |
| } |
| |
| const Vector<RefPtr<const StyleRule>>& ElementRuleCollector::matchedRuleList() const |
| { |
| ASSERT(m_mode == SelectorChecker::Mode::CollectingRules); |
| return m_matchedRuleList; |
| } |
| |
| inline void ElementRuleCollector::addMatchedRule(const RuleData& ruleData, unsigned specificity, ScopeOrdinal styleScopeOrdinal) |
| { |
| m_matchedRules.append({ &ruleData, specificity, styleScopeOrdinal }); |
| } |
| |
| void ElementRuleCollector::clearMatchedRules() |
| { |
| m_matchedRules.clear(); |
| m_keepAliveSlottedPseudoElementRules.clear(); |
| m_matchedRuleTransferIndex = 0; |
| } |
| |
| inline void ElementRuleCollector::addElementStyleProperties(const StyleProperties* propertySet, bool isCacheable) |
| { |
| if (!propertySet || propertySet->isEmpty()) |
| return; |
| |
| if (!isCacheable) |
| m_result.isCacheable = false; |
| |
| addMatchedProperties({ propertySet }, DeclarationOrigin::Author); |
| } |
| |
| void ElementRuleCollector::collectMatchingRules(const MatchRequest& matchRequest) |
| { |
| ASSERT(matchRequest.ruleSet); |
| ASSERT_WITH_MESSAGE(!(m_mode == SelectorChecker::Mode::CollectingRulesIgnoringVirtualPseudoElements && m_pseudoElementRequest.pseudoId != PseudoId::None), "When in StyleInvalidation or SharingRules, SelectorChecker does not try to match the pseudo ID. While ElementRuleCollector supports matching a particular pseudoId in this case, this would indicate a error at the call site since matching a particular element should be unnecessary."); |
| |
| auto* shadowRoot = element().containingShadowRoot(); |
| if (shadowRoot && shadowRoot->mode() == ShadowRootMode::UserAgent) |
| collectMatchingShadowPseudoElementRules(matchRequest); |
| |
| // We need to collect the rules for id, class, tag, and everything else into a buffer and |
| // then sort the buffer. |
| auto& id = element().idForStyleResolution(); |
| if (!id.isNull()) |
| collectMatchingRulesForList(matchRequest.ruleSet->idRules(id), matchRequest); |
| if (element().hasClass()) { |
| for (size_t i = 0; i < element().classNames().size(); ++i) |
| collectMatchingRulesForList(matchRequest.ruleSet->classRules(element().classNames()[i]), matchRequest); |
| } |
| |
| if (element().isLink()) |
| collectMatchingRulesForList(matchRequest.ruleSet->linkPseudoClassRules(), matchRequest); |
| if (SelectorChecker::matchesFocusPseudoClass(element())) |
| collectMatchingRulesForList(matchRequest.ruleSet->focusPseudoClassRules(), matchRequest); |
| collectMatchingRulesForList(matchRequest.ruleSet->tagRules(element().localName(), element().isHTMLElement() && element().document().isHTMLDocument()), matchRequest); |
| collectMatchingRulesForList(matchRequest.ruleSet->universalRules(), matchRequest); |
| } |
| |
| |
| Vector<MatchedProperties>& ElementRuleCollector::declarationsForOrigin(MatchResult& matchResult, DeclarationOrigin declarationOrigin) |
| { |
| switch (declarationOrigin) { |
| case DeclarationOrigin::UserAgent: return matchResult.userAgentDeclarations; |
| case DeclarationOrigin::User: return matchResult.userDeclarations; |
| case DeclarationOrigin::Author: return matchResult.authorDeclarations; |
| } |
| ASSERT_NOT_REACHED(); |
| return matchResult.authorDeclarations; |
| } |
| |
| void ElementRuleCollector::sortAndTransferMatchedRules(DeclarationOrigin declarationOrigin) |
| { |
| if (m_matchedRules.isEmpty()) |
| return; |
| |
| sortMatchedRules(); |
| |
| transferMatchedRules(declarationOrigin); |
| } |
| |
| void ElementRuleCollector::transferMatchedRules(DeclarationOrigin declarationOrigin, Optional<ScopeOrdinal> fromScope) |
| { |
| if (m_mode != SelectorChecker::Mode::CollectingRules) |
| declarationsForOrigin(m_result, declarationOrigin).reserveCapacity(m_matchedRules.size()); |
| |
| for (; m_matchedRuleTransferIndex < m_matchedRules.size(); ++m_matchedRuleTransferIndex) { |
| auto& matchedRule = m_matchedRules[m_matchedRuleTransferIndex]; |
| if (fromScope && matchedRule.styleScopeOrdinal < *fromScope) |
| break; |
| |
| if (m_mode == SelectorChecker::Mode::CollectingRules) { |
| m_matchedRuleList.append(&matchedRule.ruleData->styleRule()); |
| continue; |
| } |
| |
| addMatchedProperties({ |
| &matchedRule.ruleData->styleRule().properties(), |
| static_cast<uint16_t>(matchedRule.ruleData->linkMatchType()), |
| static_cast<uint16_t>(matchedRule.ruleData->propertyAllowlistType()), |
| matchedRule.styleScopeOrdinal |
| }, declarationOrigin); |
| } |
| } |
| |
| void ElementRuleCollector::matchAuthorRules() |
| { |
| clearMatchedRules(); |
| |
| collectMatchingAuthorRules(); |
| |
| sortAndTransferMatchedRules(DeclarationOrigin::Author); |
| } |
| |
| bool ElementRuleCollector::matchesAnyAuthorRules() |
| { |
| clearMatchedRules(); |
| |
| // FIXME: This should bail out on first match. |
| collectMatchingAuthorRules(); |
| |
| return !m_matchedRules.isEmpty(); |
| } |
| |
| void ElementRuleCollector::collectMatchingAuthorRules() |
| { |
| { |
| MatchRequest matchRequest(m_authorStyle.ptr()); |
| collectMatchingRules(matchRequest); |
| } |
| |
| auto* parent = element().parentElement(); |
| if (parent && parent->shadowRoot()) |
| matchSlottedPseudoElementRules(); |
| |
| if (element().shadowRoot()) |
| matchHostPseudoClassRules(); |
| |
| if (element().isInShadowTree()) { |
| matchAuthorShadowPseudoElementRules(); |
| matchPartPseudoElementRules(); |
| } |
| } |
| |
| void ElementRuleCollector::matchAuthorShadowPseudoElementRules() |
| { |
| ASSERT(element().isInShadowTree()); |
| auto& shadowRoot = *element().containingShadowRoot(); |
| if (shadowRoot.mode() != ShadowRootMode::UserAgent) |
| return; |
| // Look up shadow pseudo elements also from the host scope author style as they are web-exposed. |
| auto& hostAuthorRules = Scope::forNode(*shadowRoot.host()).resolver().ruleSets().authorStyle(); |
| MatchRequest hostAuthorRequest { &hostAuthorRules, ScopeOrdinal::ContainingHost }; |
| collectMatchingShadowPseudoElementRules(hostAuthorRequest); |
| } |
| |
| void ElementRuleCollector::matchHostPseudoClassRules() |
| { |
| ASSERT(element().shadowRoot()); |
| |
| auto& shadowAuthorStyle = element().shadowRoot()->styleScope().resolver().ruleSets().authorStyle(); |
| auto& shadowHostRules = shadowAuthorStyle.hostPseudoClassRules(); |
| if (shadowHostRules.isEmpty()) |
| return; |
| |
| SetForScope<bool> change(m_isMatchingHostPseudoClass, true); |
| |
| MatchRequest hostMatchRequest { nullptr, ScopeOrdinal::Shadow }; |
| collectMatchingRulesForList(&shadowHostRules, hostMatchRequest); |
| } |
| |
| void ElementRuleCollector::matchSlottedPseudoElementRules() |
| { |
| auto* slot = element().assignedSlot(); |
| auto styleScopeOrdinal = ScopeOrdinal::FirstSlot; |
| |
| for (; slot; slot = slot->assignedSlot(), ++styleScopeOrdinal) { |
| auto& styleScope = Scope::forNode(*slot); |
| if (!styleScope.resolver().ruleSets().isAuthorStyleDefined()) |
| continue; |
| // Find out if there are any ::slotted rules in the shadow tree matching the current slot. |
| // FIXME: This is really part of the slot style and could be cached when resolving it. |
| ElementRuleCollector collector(*slot, styleScope.resolver().ruleSets().authorStyle(), nullptr); |
| auto slottedPseudoElementRules = collector.collectSlottedPseudoElementRulesForSlot(); |
| if (!slottedPseudoElementRules) |
| continue; |
| // Match in the current scope. |
| SetForScope<bool> change(m_isMatchingSlottedPseudoElements, true); |
| |
| MatchRequest scopeMatchRequest(nullptr, styleScopeOrdinal); |
| collectMatchingRulesForList(slottedPseudoElementRules.get(), scopeMatchRequest); |
| |
| m_keepAliveSlottedPseudoElementRules.append(WTFMove(slottedPseudoElementRules)); |
| } |
| } |
| |
| void ElementRuleCollector::matchPartPseudoElementRules() |
| { |
| ASSERT(element().isInShadowTree()); |
| |
| bool isUAShadowPseudoElement = element().containingShadowRoot()->mode() == ShadowRootMode::UserAgent && !element().shadowPseudoId().isNull(); |
| |
| auto& partMatchingElement = isUAShadowPseudoElement ? *element().shadowHost() : element(); |
| if (partMatchingElement.partNames().isEmpty() || !partMatchingElement.isInShadowTree()) |
| return; |
| |
| matchPartPseudoElementRulesForScope(*partMatchingElement.containingShadowRoot()); |
| } |
| |
| void ElementRuleCollector::matchPartPseudoElementRulesForScope(const ShadowRoot& scopeShadowRoot) |
| { |
| auto& shadowHost = *scopeShadowRoot.host(); |
| { |
| SetForScope<RefPtr<const Element>> partMatchingScope(m_shadowHostInPartRuleScope, &shadowHost); |
| |
| auto& hostAuthorRules = Scope::forNode(shadowHost).resolver().ruleSets().authorStyle(); |
| MatchRequest hostAuthorRequest { &hostAuthorRules, ScopeOrdinal::ContainingHost }; |
| collectMatchingRulesForList(&hostAuthorRules.partPseudoElementRules(), hostAuthorRequest); |
| } |
| |
| // Element may be exposed to styling from enclosing scopes via exportparts attributes. |
| if (scopeShadowRoot.partMappings().isEmpty()) |
| return; |
| |
| if (auto* parentScopeShadowRoot = shadowHost.containingShadowRoot()) |
| matchPartPseudoElementRulesForScope(*parentScopeShadowRoot); |
| } |
| |
| void ElementRuleCollector::collectMatchingShadowPseudoElementRules(const MatchRequest& matchRequest) |
| { |
| ASSERT(matchRequest.ruleSet); |
| ASSERT(element().containingShadowRoot()->mode() == ShadowRootMode::UserAgent); |
| |
| auto& rules = *matchRequest.ruleSet; |
| #if ENABLE(VIDEO) |
| // FXIME: WebVTT should not be done by styling UA shadow trees like this. |
| if (element().isWebVTTElement()) |
| collectMatchingRulesForList(rules.cuePseudoRules(), matchRequest); |
| #endif |
| auto& pseudoId = element().shadowPseudoId(); |
| if (!pseudoId.isEmpty()) |
| collectMatchingRulesForList(rules.shadowPseudoElementRules(pseudoId), matchRequest); |
| } |
| |
| std::unique_ptr<RuleSet::RuleDataVector> ElementRuleCollector::collectSlottedPseudoElementRulesForSlot() |
| { |
| ASSERT(is<HTMLSlotElement>(element())); |
| |
| clearMatchedRules(); |
| |
| m_mode = SelectorChecker::Mode::CollectingRules; |
| |
| // Match global author rules. |
| MatchRequest matchRequest(m_authorStyle.ptr()); |
| collectMatchingRulesForList(&m_authorStyle->slottedPseudoElementRules(), matchRequest); |
| |
| if (m_matchedRules.isEmpty()) |
| return { }; |
| |
| auto ruleDataVector = makeUnique<RuleSet::RuleDataVector>(); |
| ruleDataVector->reserveInitialCapacity(m_matchedRules.size()); |
| for (auto& matchedRule : m_matchedRules) |
| ruleDataVector->uncheckedAppend(*matchedRule.ruleData); |
| |
| return ruleDataVector; |
| } |
| |
| void ElementRuleCollector::matchUserRules() |
| { |
| if (!m_userStyle) |
| return; |
| |
| clearMatchedRules(); |
| |
| MatchRequest matchRequest(m_userStyle.get()); |
| collectMatchingRules(matchRequest); |
| |
| sortAndTransferMatchedRules(DeclarationOrigin::User); |
| } |
| |
| void ElementRuleCollector::matchUARules() |
| { |
| // First we match rules from the user agent sheet. |
| if (UserAgentStyle::simpleDefaultStyleSheet) |
| m_result.isCacheable = false; |
| auto* userAgentStyleSheet = m_isPrintStyle |
| ? UserAgentStyle::defaultPrintStyle : UserAgentStyle::defaultStyle; |
| matchUARules(*userAgentStyleSheet); |
| |
| // In quirks mode, we match rules from the quirks user agent sheet. |
| if (element().document().inQuirksMode()) |
| matchUARules(*UserAgentStyle::defaultQuirksStyle); |
| |
| if (m_userAgentMediaQueryStyle) |
| matchUARules(*m_userAgentMediaQueryStyle); |
| } |
| |
| void ElementRuleCollector::matchUARules(const RuleSet& rules) |
| { |
| clearMatchedRules(); |
| |
| collectMatchingRules(MatchRequest(&rules)); |
| |
| sortAndTransferMatchedRules(DeclarationOrigin::UserAgent); |
| } |
| |
| static const CSSSelector* findSlottedPseudoElementSelector(const CSSSelector* selector) |
| { |
| for (; selector; selector = selector->tagHistory()) { |
| if (selector->match() == CSSSelector::PseudoElement && selector->pseudoElementType() == CSSSelector::PseudoElementSlotted) { |
| if (auto* list = selector->selectorList()) |
| return list->first(); |
| break; |
| } |
| }; |
| return nullptr; |
| } |
| |
| inline bool ElementRuleCollector::ruleMatches(const RuleData& ruleData, unsigned& specificity) |
| { |
| // We know a sufficiently simple single part selector matches simply because we found it from the rule hash when filtering the RuleSet. |
| // This is limited to HTML only so we don't need to check the namespace (because of tag name match). |
| auto matchBasedOnRuleHash = ruleData.matchBasedOnRuleHash(); |
| if (matchBasedOnRuleHash != MatchBasedOnRuleHash::None && element().isHTMLElement()) { |
| ASSERT_WITH_MESSAGE(m_pseudoElementRequest.pseudoId == PseudoId::None, "If we match based on the rule hash while collecting for a particular pseudo element ID, we would add incorrect rules for that pseudo element ID. We should never end in ruleMatches() with a pseudo element if the ruleData cannot match any pseudo element."); |
| |
| switch (matchBasedOnRuleHash) { |
| case MatchBasedOnRuleHash::None: |
| ASSERT_NOT_REACHED(); |
| break; |
| case MatchBasedOnRuleHash::Universal: |
| specificity = 0; |
| break; |
| case MatchBasedOnRuleHash::ClassA: |
| specificity = static_cast<unsigned>(SelectorSpecificityIncrement::ClassA); |
| break; |
| case MatchBasedOnRuleHash::ClassB: |
| specificity = static_cast<unsigned>(SelectorSpecificityIncrement::ClassB); |
| break; |
| case MatchBasedOnRuleHash::ClassC: |
| specificity = static_cast<unsigned>(SelectorSpecificityIncrement::ClassC); |
| break; |
| } |
| return true; |
| } |
| |
| #if ENABLE(CSS_SELECTOR_JIT) |
| auto& compiledSelector = ruleData.compiledSelector(); |
| |
| if (compiledSelector.status == SelectorCompilationStatus::NotCompiled) |
| SelectorCompiler::compileSelector(compiledSelector, ruleData.selector(), SelectorCompiler::SelectorContext::RuleCollector); |
| |
| if (compiledSelector.status == SelectorCompilationStatus::SimpleSelectorChecker) { |
| compiledSelector.wasUsed(); |
| |
| auto selectorChecker = SelectorCompiler::ruleCollectorSimpleSelectorCheckerFunction(compiledSelector); |
| #if !ASSERT_MSG_DISABLED |
| unsigned ignoreSpecificity; |
| ASSERT_WITH_MESSAGE(!selectorChecker(&element(), &ignoreSpecificity) || m_pseudoElementRequest.pseudoId == PseudoId::None, "When matching pseudo elements, we should never compile a selector checker without context unless it cannot match anything."); |
| #endif |
| bool selectorMatches = selectorChecker(&element(), &specificity); |
| |
| if (selectorMatches && ruleData.containsUncommonAttributeSelector()) |
| m_didMatchUncommonAttributeSelector = true; |
| |
| return selectorMatches; |
| } |
| #endif // ENABLE(CSS_SELECTOR_JIT) |
| |
| SelectorChecker::CheckingContext context(m_mode); |
| context.pseudoId = m_pseudoElementRequest.pseudoId; |
| context.scrollbarState = m_pseudoElementRequest.scrollbarState; |
| context.nameForHightlightPseudoElement = m_pseudoElementRequest.highlightName; |
| context.isMatchingHostPseudoClass = m_isMatchingHostPseudoClass; |
| context.shadowHostInPartRuleScope = m_shadowHostInPartRuleScope.get(); |
| |
| bool selectorMatches; |
| #if ENABLE(CSS_SELECTOR_JIT) |
| if (compiledSelector.status == SelectorCompilationStatus::SelectorCheckerWithCheckingContext) { |
| compiledSelector.wasUsed(); |
| |
| auto selectorChecker = SelectorCompiler::ruleCollectorSelectorCheckerFunctionWithCheckingContext(compiledSelector); |
| selectorMatches = selectorChecker(&element(), &context, &specificity); |
| } else |
| #endif // ENABLE(CSS_SELECTOR_JIT) |
| { |
| auto* selector = ruleData.selector(); |
| if (m_isMatchingSlottedPseudoElements) { |
| selector = findSlottedPseudoElementSelector(ruleData.selector()); |
| if (!selector) |
| return false; |
| } |
| // Slow path. |
| SelectorChecker selectorChecker(element().document()); |
| selectorMatches = selectorChecker.match(*selector, element(), context); |
| if (selectorMatches) |
| specificity = selector->computeSpecificity(); |
| } |
| |
| if (ruleData.containsUncommonAttributeSelector()) { |
| if (selectorMatches || context.pseudoIDSet) |
| m_didMatchUncommonAttributeSelector = true; |
| } |
| m_matchedPseudoElementIds.merge(context.pseudoIDSet); |
| m_styleRelations.appendVector(context.styleRelations); |
| |
| return selectorMatches; |
| } |
| |
| void ElementRuleCollector::collectMatchingRulesForList(const RuleSet::RuleDataVector* rules, const MatchRequest& matchRequest) |
| { |
| if (!rules) |
| return; |
| |
| for (unsigned i = 0, size = rules->size(); i < size; ++i) { |
| const auto& ruleData = rules->data()[i]; |
| |
| if (UNLIKELY(!ruleData.isEnabled())) |
| continue; |
| |
| if (!ruleData.canMatchPseudoElement() && m_pseudoElementRequest.pseudoId != PseudoId::None) |
| continue; |
| |
| if (m_selectorFilter && m_selectorFilter->fastRejectSelector(ruleData.descendantSelectorIdentifierHashes())) |
| continue; |
| |
| auto& rule = ruleData.styleRule(); |
| |
| // If the rule has no properties to apply, then ignore it in the non-debug mode. |
| // Note that if we get null back here, it means we have a rule with deferred properties, |
| // and that means we always have to consider it. |
| const StyleProperties* properties = rule.propertiesWithoutDeferredParsing(); |
| if (properties && properties->isEmpty() && !m_shouldIncludeEmptyRules) |
| continue; |
| |
| unsigned specificity; |
| if (ruleMatches(ruleData, specificity)) |
| addMatchedRule(ruleData, specificity, matchRequest.styleScopeOrdinal); |
| } |
| } |
| |
| static inline bool compareRules(MatchedRule r1, MatchedRule r2) |
| { |
| // For normal properties the earlier scope wins. This may be reversed by !important which is handled when resolving cascade. |
| if (r1.styleScopeOrdinal != r2.styleScopeOrdinal) |
| return r1.styleScopeOrdinal > r2.styleScopeOrdinal; |
| |
| if (r1.specificity != r2.specificity) |
| return r1.specificity < r2.specificity; |
| |
| return r1.ruleData->position() < r2.ruleData->position(); |
| } |
| |
| void ElementRuleCollector::sortMatchedRules() |
| { |
| std::sort(m_matchedRules.begin(), m_matchedRules.end(), compareRules); |
| } |
| |
| void ElementRuleCollector::matchAllRules(bool matchAuthorAndUserStyles, bool includeSMILProperties) |
| { |
| matchUARules(); |
| |
| // Now we check user sheet rules. |
| if (matchAuthorAndUserStyles) |
| matchUserRules(); |
| |
| // Now check author rules, beginning first with presentational attributes mapped from HTML. |
| if (is<StyledElement>(element())) { |
| auto& styledElement = downcast<StyledElement>(element()); |
| addElementStyleProperties(styledElement.presentationAttributeStyle()); |
| |
| // Now we check additional mapped declarations. |
| // Tables and table cells share an additional mapped rule that must be applied |
| // after all attributes, since their mapped style depends on the values of multiple attributes. |
| addElementStyleProperties(styledElement.additionalPresentationAttributeStyle()); |
| |
| if (is<HTMLElement>(styledElement)) { |
| bool isAuto; |
| auto textDirection = downcast<HTMLElement>(styledElement).directionalityIfhasDirAutoAttribute(isAuto); |
| auto& properties = textDirection == TextDirection::LTR ? leftToRightDeclaration() : rightToLeftDeclaration(); |
| if (isAuto) |
| addMatchedProperties({ &properties }, DeclarationOrigin::Author); |
| } |
| } |
| |
| if (matchAuthorAndUserStyles) { |
| clearMatchedRules(); |
| |
| collectMatchingAuthorRules(); |
| sortMatchedRules(); |
| |
| transferMatchedRules(DeclarationOrigin::Author, ScopeOrdinal::Element); |
| |
| // Inline style behaves as if it has higher specificity than any rule. |
| addElementInlineStyleProperties(includeSMILProperties); |
| |
| // Rules from the host scope override inline style. |
| transferMatchedRules(DeclarationOrigin::Author, ScopeOrdinal::ContainingHost); |
| } |
| } |
| |
| void ElementRuleCollector::addElementInlineStyleProperties(bool includeSMILProperties) |
| { |
| if (!is<StyledElement>(element())) |
| return; |
| |
| if (auto* inlineStyle = downcast<StyledElement>(element()).inlineStyle()) { |
| // FIXME: Media control shadow trees seem to have problems with caching. |
| bool isInlineStyleCacheable = !inlineStyle->isMutable() && !element().isInShadowTree(); |
| addElementStyleProperties(inlineStyle, isInlineStyleCacheable); |
| } |
| |
| if (includeSMILProperties && is<SVGElement>(element())) |
| addElementStyleProperties(downcast<SVGElement>(element()).animatedSMILStyleProperties(), false /* isCacheable */); |
| } |
| |
| bool ElementRuleCollector::hasAnyMatchingRules(const RuleSet* ruleSet) |
| { |
| clearMatchedRules(); |
| |
| m_mode = SelectorChecker::Mode::CollectingRulesIgnoringVirtualPseudoElements; |
| collectMatchingRules(MatchRequest(ruleSet)); |
| |
| return !m_matchedRules.isEmpty(); |
| } |
| |
| void ElementRuleCollector::addMatchedProperties(MatchedProperties&& matchedProperties, DeclarationOrigin declarationOrigin) |
| { |
| // FIXME: This should be moved to the matched properties cache code. |
| auto computeIsCacheable = [&] { |
| if (!m_result.isCacheable) |
| return false; |
| |
| if (matchedProperties.styleScopeOrdinal != ScopeOrdinal::Element) |
| return false; |
| |
| auto& properties = *matchedProperties.properties; |
| for (unsigned i = 0, count = properties.propertyCount(); i < count; ++i) { |
| // Currently the property cache only copy the non-inherited values and resolve |
| // the inherited ones. |
| // Here we define some exception were we have to resolve some properties that are not inherited |
| // by default. If those exceptions become too common on the web, it should be possible |
| // to build a list of exception to resolve instead of completely disabling the cache. |
| StyleProperties::PropertyReference current = properties.propertyAt(i); |
| if (current.isInherited()) |
| continue; |
| |
| // If the property value is explicitly inherited, we need to apply further non-inherited properties |
| // as they might override the value inherited here. For this reason we don't allow declarations with |
| // explicitly inherited properties to be cached. |
| const CSSValue& value = *current.value(); |
| if (value.isInheritedValue()) |
| return false; |
| |
| // The value currentColor has implicitely the same side effect. It depends on the value of color, |
| // which is an inherited value, making the non-inherited property implicitly inherited. |
| if (is<CSSPrimitiveValue>(value) && downcast<CSSPrimitiveValue>(value).valueID() == CSSValueCurrentcolor) |
| return false; |
| |
| if (value.hasVariableReferences()) |
| return false; |
| } |
| |
| return true; |
| }; |
| |
| m_result.isCacheable = computeIsCacheable(); |
| |
| declarationsForOrigin(m_result, declarationOrigin).append(WTFMove(matchedProperties)); |
| } |
| |
| } |
| } // namespace WebCore |
