C++ RuleData::containsUncommonAttributeSelector方法代码示例

void RuleFeatureSet::collectFeaturesFromRuleData(const RuleData& ruleData)
{
    FeatureMetadata metadata;
    bool selectorUsesClassInvalidationSet = false;
    if (m_targetedStyleRecalcEnabled)
        selectorUsesClassInvalidationSet = updateClassInvalidationSets(ruleData.selector());

    SelectorFeatureCollectionMode collectionMode;
    if (selectorUsesClassInvalidationSet)
        collectionMode = DontProcessClasses;
    else
        collectionMode = ProcessClasses;
    collectFeaturesFromSelector(ruleData.selector(), metadata, collectionMode);
    m_metadata.add(metadata);

    if (metadata.foundSiblingSelector)
        siblingRules.append(RuleFeature(ruleData.rule(), ruleData.selectorIndex(), ruleData.hasDocumentSecurityOrigin()));
    if (ruleData.containsUncommonAttributeSelector())
        uncommonAttributeRules.append(RuleFeature(ruleData.rule(), ruleData.selectorIndex(), ruleData.hasDocumentSecurityOrigin()));
}

static void collectFeaturesFromRuleData(RuleFeatureSet& features, const RuleData& ruleData)
{
    bool foundSiblingSelector = false;
    for (CSSSelector* selector = ruleData.selector(); selector; selector = selector->tagHistory()) {
        features.collectFeaturesFromSelector(selector);
        
        if (CSSSelectorList* selectorList = selector->selectorList()) {
            for (CSSSelector* subSelector = selectorList->first(); subSelector; subSelector = CSSSelectorList::next(subSelector)) {
                if (!foundSiblingSelector && selector->isSiblingSelector())
                    foundSiblingSelector = true;
                features.collectFeaturesFromSelector(subSelector);
            }
        } else if (!foundSiblingSelector && selector->isSiblingSelector())
            foundSiblingSelector = true;
    }
    if (foundSiblingSelector)
        features.siblingRules.append(RuleFeature(ruleData.rule(), ruleData.selectorIndex(), ruleData.hasDocumentSecurityOrigin()));
    if (ruleData.containsUncommonAttributeSelector())
        features.uncommonAttributeRules.append(RuleFeature(ruleData.rule(), ruleData.selectorIndex(), ruleData.hasDocumentSecurityOrigin()));
}

void ElementRuleCollector::didMatchRule(const RuleData& ruleData, const SelectorChecker::MatchResult& result, CascadeOrder cascadeOrder, const MatchRequest& matchRequest)
{
    PseudoId dynamicPseudo = result.dynamicPseudo;
    // If we're matching normal rules, set a pseudo bit if
    // we really just matched a pseudo-element.
    if (dynamicPseudo != NOPSEUDO && m_pseudoStyleRequest.pseudoId == NOPSEUDO) {
        if (m_mode == SelectorChecker::CollectingCSSRules || m_mode == SelectorChecker::CollectingStyleRules)
            return;
        // FIXME: Matching should not modify the style directly.
        if (!m_style || dynamicPseudo >= FIRST_INTERNAL_PSEUDOID)
            return;
        if ((dynamicPseudo == BEFORE || dynamicPseudo == AFTER) && !ruleData.rule()->properties().hasProperty(CSSPropertyContent))
            return;
        m_style->setHasPseudoStyle(dynamicPseudo);
    } else {
        if (m_style && ruleData.containsUncommonAttributeSelector())
            m_style->setUnique();

        m_matchedRules.append(MatchedRule(&ruleData, result.specificity, cascadeOrder, matchRequest.styleSheetIndex, matchRequest.styleSheet));
    }
}

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).
    MatchBasedOnRuleHash matchBasedOnRuleHash = ruleData.matchBasedOnRuleHash();
    if (matchBasedOnRuleHash != MatchBasedOnRuleHash::None && m_element.isHTMLElement()) {
        ASSERT_WITH_MESSAGE(m_pseudoStyleRequest.pseudoId == NOPSEUDO, "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)
    void* compiledSelectorChecker = ruleData.compiledSelectorCodeRef().code().executableAddress();
    if (!compiledSelectorChecker && ruleData.compilationStatus() == SelectorCompilationStatus::NotCompiled) {
        JSC::VM& vm = m_element.document().scriptExecutionContext()->vm();
        SelectorCompilationStatus compilationStatus;
        JSC::MacroAssemblerCodeRef compiledSelectorCodeRef;
        compilationStatus = SelectorCompiler::compileSelector(ruleData.selector(), &vm, SelectorCompiler::SelectorContext::RuleCollector, compiledSelectorCodeRef);

        ruleData.setCompiledSelector(compilationStatus, compiledSelectorCodeRef);
        compiledSelectorChecker = ruleData.compiledSelectorCodeRef().code().executableAddress();
    }

    if (compiledSelectorChecker && ruleData.compilationStatus() == SelectorCompilationStatus::SimpleSelectorChecker) {
        SelectorCompiler::RuleCollectorSimpleSelectorChecker selectorChecker = SelectorCompiler::ruleCollectorSimpleSelectorCheckerFunction(compiledSelectorChecker, ruleData.compilationStatus());
#if !ASSERT_MSG_DISABLED
        unsigned ignoreSpecificity;
        ASSERT_WITH_MESSAGE(!selectorChecker(&m_element, &ignoreSpecificity) || m_pseudoStyleRequest.pseudoId == NOPSEUDO, "When matching pseudo elements, we should never compile a selector checker without context unless it cannot match anything.");
#endif
#if CSS_SELECTOR_JIT_PROFILING
        ruleData.compiledSelectorUsed();
#endif
        bool selectorMatches = selectorChecker(&m_element, &specificity);

        if (selectorMatches && ruleData.containsUncommonAttributeSelector())
            m_didMatchUncommonAttributeSelector = true;

        return selectorMatches;
    }
#endif // ENABLE(CSS_SELECTOR_JIT)

    SelectorChecker::CheckingContext context(m_mode);
    context.pseudoId = m_pseudoStyleRequest.pseudoId;
    context.scrollbar = m_pseudoStyleRequest.scrollbar;
    context.scrollbarPart = m_pseudoStyleRequest.scrollbarPart;

    bool selectorMatches;
#if ENABLE(CSS_SELECTOR_JIT)
    if (compiledSelectorChecker) {
        ASSERT(ruleData.compilationStatus() == SelectorCompilationStatus::SelectorCheckerWithCheckingContext);

        SelectorCompiler::RuleCollectorSelectorCheckerWithCheckingContext selectorChecker = SelectorCompiler::ruleCollectorSelectorCheckerFunctionWithCheckingContext(compiledSelectorChecker, ruleData.compilationStatus());

#if CSS_SELECTOR_JIT_PROFILING
        ruleData.compiledSelectorUsed();
#endif
        selectorMatches = selectorChecker(&m_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(m_element.document());
        selectorMatches = selectorChecker.match(*selector, m_element, context, specificity);
    }

    if (ruleData.containsUncommonAttributeSelector()) {
        if (selectorMatches || context.pseudoIDSet)
            m_didMatchUncommonAttributeSelector = true;
    }
    m_matchedPseudoElementIds.merge(context.pseudoIDSet);
    m_styleRelations.appendVector(context.styleRelations);

    return selectorMatches;
}