C++ StyleRule类代码示例

void ElementRuleCollector::collectMatchingRulesForList(const Vector<RuleData>* rules, const MatchRequest& matchRequest, StyleResolver::RuleRange& ruleRange)
{
    if (!rules)
        return;

    for (unsigned i = 0, size = rules->size(); i < size; ++i) {
        const RuleData& ruleData = rules->data()[i];
        if (m_canUseFastReject && m_selectorFilter.fastRejectSelector<RuleData::maximumIdentifierCount>(ruleData.descendantSelectorIdentifierHashes()))
            continue;

        StyleRule* rule = ruleData.rule();

        // If the rule has no properties to apply, then ignore it in the non-debug mode.
        const StyleProperties& properties = rule->properties();
        if (properties.isEmpty() && !matchRequest.includeEmptyRules)
            continue;

        // FIXME: Exposing the non-standard getMatchedCSSRules API to web is the only reason this is needed.
        if (m_sameOriginOnly && !ruleData.hasDocumentSecurityOrigin())
            continue;

        if (ruleMatches(ruleData)) {
            // Update our first/last rule indices in the matched rules array.
            ++ruleRange.lastRuleIndex;
            if (ruleRange.firstRuleIndex == -1)
                ruleRange.firstRuleIndex = ruleRange.lastRuleIndex;

            // Add this rule to our list of matched rules.
            addMatchedRule(&ruleData);
        }
    }
}

void RuleSet::addChildRules(const WillBeHeapVector<RefPtrWillBeMember<StyleRuleBase>>& rules, const MediaQueryEvaluator& medium, AddRuleFlags addRuleFlags)
{
    for (unsigned i = 0; i < rules.size(); ++i) {
        StyleRuleBase* rule = rules[i].get();

        if (rule->isStyleRule()) {
            StyleRule* styleRule = toStyleRule(rule);

            const CSSSelectorList& selectorList = styleRule->selectorList();
            for (size_t selectorIndex = 0; selectorIndex != kNotFound; selectorIndex = selectorList.indexOfNextSelectorAfter(selectorIndex)) {
                if (selectorList.selectorCrossesTreeScopes(selectorIndex)) {
                    m_treeBoundaryCrossingRules.append(MinimalRuleData(styleRule, selectorIndex, addRuleFlags));
                } else if (selectorList.hasShadowDistributedAt(selectorIndex)) {
                    m_shadowDistributedRules.append(MinimalRuleData(styleRule, selectorIndex, addRuleFlags));
                } else {
                    addRule(styleRule, selectorIndex, addRuleFlags);
                }
            }
        } else if (rule->isPageRule()) {
            addPageRule(toStyleRulePage(rule));
        } else if (rule->isMediaRule()) {
            StyleRuleMedia* mediaRule = toStyleRuleMedia(rule);
            if ((!mediaRule->mediaQueries() || medium.eval(mediaRule->mediaQueries(), &m_viewportDependentMediaQueryResults)))
                addChildRules(mediaRule->childRules(), medium, addRuleFlags);
        } else if (rule->isFontFaceRule()) {
            addFontFaceRule(toStyleRuleFontFace(rule));
        } else if (rule->isKeyframesRule()) {
            addKeyframesRule(toStyleRuleKeyframes(rule));
        } else if (rule->isViewportRule()) {
            addViewportRule(toStyleRuleViewport(rule));
        } else if (rule->isSupportsRule() && toStyleRuleSupports(rule)->conditionIsSupported()) {
            addChildRules(toStyleRuleSupports(rule)->childRules(), medium, addRuleFlags);
        }
    }
}

void ElementRuleCollector::collectMatchingRulesForList(const RuleSet::RuleDataVector* rules, const MatchRequest& matchRequest, StyleResolver::RuleRange& ruleRange)
{
    if (!rules)
        return;

    for (unsigned i = 0, size = rules->size(); i < size; ++i) {
        const RuleData& ruleData = rules->data()[i];

        if (!ruleData.canMatchPseudoElement() && m_pseudoStyleRequest.pseudoId != NOPSEUDO)
            continue;

        if (m_selectorFilter && m_selectorFilter->fastRejectSelector<RuleData::maximumIdentifierCount>(ruleData.descendantSelectorIdentifierHashes()))
            continue;

        StyleRule* rule = ruleData.rule();

        // If the rule has no properties to apply, then ignore it in the non-debug mode.
        const StyleProperties& properties = rule->properties();
        if (properties.isEmpty() && !matchRequest.includeEmptyRules)
            continue;

        // FIXME: Exposing the non-standard getMatchedCSSRules API to web is the only reason this is needed.
        if (m_sameOriginOnly && !ruleData.hasDocumentSecurityOrigin())
            continue;

        unsigned specificity;
        if (ruleMatches(ruleData, specificity))
            addMatchedRule(ruleData, specificity, matchRequest.treeContextOrdinal, ruleRange);
    }
}

void ElementRuleCollector::collectRuleIfMatches(const RuleData& ruleData, SelectorChecker::BehaviorAtBoundary behaviorAtBoundary, CascadeScope cascadeScope, CascadeOrder cascadeOrder, const MatchRequest& matchRequest, RuleRange& ruleRange)
{
    if (m_canUseFastReject && m_selectorFilter.fastRejectSelector<RuleData::maximumIdentifierCount>(ruleData.descendantSelectorIdentifierHashes()))
        return;

    StyleRule* rule = ruleData.rule();
    PseudoId dynamicPseudo = NOPSEUDO;
    if (ruleMatches(ruleData, matchRequest.scope, dynamicPseudo, behaviorAtBoundary)) {
        // If the rule has no properties to apply, then ignore it in the non-debug mode.
        const StylePropertySet* properties = rule->properties();
        if (!properties || (properties->isEmpty() && !matchRequest.includeEmptyRules))
            return;
        // FIXME: Exposing the non-standard getMatchedCSSRules API to web is the only reason this is needed.
        if (m_sameOriginOnly && !ruleData.hasDocumentSecurityOrigin())
            return;
        // 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)
                m_style->setHasPseudoStyle(dynamicPseudo);
        } else {
            // Update our first/last rule indices in the matched rules array.
            ++ruleRange.lastRuleIndex;
            if (ruleRange.firstRuleIndex == -1)
                ruleRange.firstRuleIndex = ruleRange.lastRuleIndex;

            // Add this rule to our list of matched rules.
            addMatchedRule(&ruleData, cascadeScope, cascadeOrder);
            return;
        }
    }
}

void ElementRuleCollector::collectMatchingRulesForList(const RuleDataListType* rules, CascadeOrder cascadeOrder, const MatchRequest& matchRequest)
{
    if (!rules)
        return;

    SelectorChecker::Init init;
    init.mode = m_mode;
    init.isUARule = m_matchingUARules;
    init.elementStyle = m_style.get();
    init.scrollbar = m_pseudoStyleRequest.scrollbar;
    init.scrollbarPart = m_pseudoStyleRequest.scrollbarPart;
    SelectorChecker checker(init);
    SelectorChecker::SelectorCheckingContext context(m_context.element(), SelectorChecker::VisitedMatchEnabled);
    context.scope = matchRequest.scope;
    context.pseudoId = m_pseudoStyleRequest.pseudoId;

    unsigned rejected = 0;
    unsigned fastRejected = 0;
    unsigned matched = 0;

    for (const auto& ruleData : *rules) {
        if (m_canUseFastReject && m_selectorFilter.fastRejectSelector<RuleData::maximumIdentifierCount>(ruleData.descendantSelectorIdentifierHashes())) {
            fastRejected++;
            continue;
        }

        // FIXME: Exposing the non-standard getMatchedCSSRules API to web is the only reason this is needed.
        if (m_sameOriginOnly && !ruleData.hasDocumentSecurityOrigin())
            continue;

        StyleRule* rule = ruleData.rule();

        // If the rule has no properties to apply, then ignore it in the non-debug mode.
        const StylePropertySet& properties = rule->properties();
        if (properties.isEmpty() && !m_includeEmptyRules)
            continue;

        SelectorChecker::MatchResult result;
        context.selector = &ruleData.selector();
        if (!checker.match(context, result)) {
            rejected++;
            continue;
        }
        if (m_pseudoStyleRequest.pseudoId != PseudoIdNone && m_pseudoStyleRequest.pseudoId != result.dynamicPseudo) {
            rejected++;
            continue;
        }

        matched++;
        didMatchRule(ruleData, result, cascadeOrder, matchRequest);
    }

    StyleEngine& styleEngine = m_context.element()->document().styleEngine();
    if (!styleEngine.stats())
        return;

    INCREMENT_STYLE_STATS_COUNTER(styleEngine, rulesRejected, rejected);
    INCREMENT_STYLE_STATS_COUNTER(styleEngine, rulesFastRejected, fastRejected);
    INCREMENT_STYLE_STATS_COUNTER(styleEngine, rulesMatched, matched);
}

void StyleInvalidationAnalysis::analyzeStyleSheet(StyleSheetContents* styleSheetContents)
{
    ASSERT(!styleSheetContents->isLoading());

    // See if all rules on the sheet are scoped to some specific ids or classes.
    // Then test if we actually have any of those in the tree at the moment.
    const Vector<RefPtr<StyleRuleImport> >& importRules = styleSheetContents->importRules();
    for (unsigned i = 0; i < importRules.size(); ++i) {
        if (!importRules[i]->styleSheet())
            continue;
        analyzeStyleSheet(importRules[i]->styleSheet());
        if (m_dirtiesAllStyle)
            return;
    }
    const Vector<RefPtr<StyleRuleBase> >& rules = styleSheetContents->childRules();
    for (unsigned i = 0; i < rules.size(); i++) {
        StyleRuleBase* rule = rules[i].get();
        if (!rule->isStyleRule()) {
            // FIXME: Media rules and maybe some others could be allowed.
            m_dirtiesAllStyle = true;
            return;
        }
        StyleRule* styleRule = static_cast<StyleRule*>(rule);
        if (!determineSelectorScopes(styleRule->selectorList(), m_idScopes, m_classScopes)) {
            m_dirtiesAllStyle = true;
            return;
        }
    }
}

void ElementRuleCollector::doCollectMatchingRulesForList(const Vector<RuleData>* rules, const MatchRequest& matchRequest, StyleResolver::RuleRange& ruleRange)
{
    if (!rules)
        return;

    const StyleResolver::State& state = m_state;

    unsigned size = rules->size();
    for (unsigned i = 0; i < size; ++i) {
        const RuleData& ruleData = rules->at(i);
        if (m_canUseFastReject && m_selectorFilter.fastRejectSelector<RuleData::maximumIdentifierCount>(ruleData.descendantSelectorIdentifierHashes()))
            continue;

        StyleRule* rule = ruleData.rule();
        InspectorInstrumentationCookie cookie;
        if (hasInspectorFrontends)
            cookie = InspectorInstrumentation::willMatchRule(document(), rule, m_inspectorCSSOMWrappers, document()->styleSheetCollection());
        PseudoId dynamicPseudo = NOPSEUDO;
        if (ruleMatches(ruleData, matchRequest.scope, dynamicPseudo)) {
            // If the rule has no properties to apply, then ignore it in the non-debug mode.
            const StylePropertySet* properties = rule->properties();
            if (!properties || (properties->isEmpty() && !matchRequest.includeEmptyRules)) {
                if (hasInspectorFrontends)
                    InspectorInstrumentation::didMatchRule(cookie, false);
                continue;
            }
            // FIXME: Exposing the non-standard getMatchedCSSRules API to web is the only reason this is needed.
            if (m_sameOriginOnly && !ruleData.hasDocumentSecurityOrigin()) {
                if (hasInspectorFrontends)
                    InspectorInstrumentation::didMatchRule(cookie, false);
                continue;
            }
            // 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::CollectingRules) {
                    if (hasInspectorFrontends)
                        InspectorInstrumentation::didMatchRule(cookie, false);
                    continue;
                }
                if (dynamicPseudo < FIRST_INTERNAL_PSEUDOID)
                    state.style()->setHasPseudoStyle(dynamicPseudo);
            } else {
                // Update our first/last rule indices in the matched rules array.
                ++ruleRange.lastRuleIndex;
                if (ruleRange.firstRuleIndex == -1)
                    ruleRange.firstRuleIndex = ruleRange.lastRuleIndex;

                // Add this rule to our list of matched rules.
                addMatchedRule(&ruleData);
                if (hasInspectorFrontends)
                    InspectorInstrumentation::didMatchRule(cookie, true);
                continue;
            }
        }
        if (hasInspectorFrontends)
            InspectorInstrumentation::didMatchRule(cookie, false);
    }
}

void RuleSet::addChildRules(const Vector<RefPtr<StyleRuleBase> >& rules, const MediaQueryEvaluator& medium, StyleResolver* resolver, const ContainerNode* scope, bool hasDocumentSecurityOrigin, AddRuleFlags addRuleFlags)
{
    for (unsigned i = 0; i < rules.size(); ++i) {
        StyleRuleBase* rule = rules[i].get();

        if (rule->isStyleRule()) {
            StyleRule* styleRule = static_cast<StyleRule*>(rule);

            const CSSSelectorList& selectorList = styleRule->selectorList();
            for (size_t selectorIndex = 0; selectorIndex != notFound; selectorIndex = selectorList.indexOfNextSelectorAfter(selectorIndex)) {
                if (selectorList.hasShadowDistributedAt(selectorIndex)) {
                    if (isDocumentScope(scope))
                        continue;
                    resolver->ruleSets().shadowDistributedRules().addRule(styleRule, selectorIndex, const_cast<ContainerNode*>(scope), addRuleFlags);
                } else
                    addRule(styleRule, selectorIndex, addRuleFlags);
            }
        } else if (rule->isPageRule())
            addPageRule(static_cast<StyleRulePage*>(rule));
        else if (rule->isMediaRule()) {
            StyleRuleMedia* mediaRule = static_cast<StyleRuleMedia*>(rule);
            if ((!mediaRule->mediaQueries() || medium.eval(mediaRule->mediaQueries(), resolver)))
                addChildRules(mediaRule->childRules(), medium, resolver, scope, hasDocumentSecurityOrigin, addRuleFlags);
        } else if (rule->isFontFaceRule() && resolver) {
            // Add this font face to our set.
            // FIXME(BUG 72461): We don't add @font-face rules of scoped style sheets for the moment.
            if (!isDocumentScope(scope))
                continue;
            const StyleRuleFontFace* fontFaceRule = static_cast<StyleRuleFontFace*>(rule);
            resolver->fontSelector()->addFontFaceRule(fontFaceRule);
            resolver->invalidateMatchedPropertiesCache();
        } else if (rule->isKeyframesRule() && resolver) {
            // FIXME (BUG 72462): We don't add @keyframe rules of scoped style sheets for the moment.
            if (!isDocumentScope(scope))
                continue;
            resolver->addKeyframeStyle(static_cast<StyleRuleKeyframes*>(rule));
        }
        else if (rule->isRegionRule() && resolver) {
            // FIXME (BUG 72472): We don't add @-webkit-region rules of scoped style sheets for the moment.
            addRegionRule(static_cast<StyleRuleRegion*>(rule), hasDocumentSecurityOrigin);
        }
        else if (rule->isHostRule())
            resolver->ensureScopedStyleResolver(scope->shadowHost())->addHostRule(static_cast<StyleRuleHost*>(rule), hasDocumentSecurityOrigin, scope);
#if ENABLE(CSS_DEVICE_ADAPTATION)
        else if (rule->isViewportRule() && resolver) {
            // @viewport should not be scoped.
            if (!isDocumentScope(scope))
                continue;
            resolver->viewportStyleResolver()->addViewportRule(static_cast<StyleRuleViewport*>(rule));
        }
#endif
        else if (rule->isSupportsRule() && static_cast<StyleRuleSupports*>(rule)->conditionIsSupported())
            addChildRules(static_cast<StyleRuleSupports*>(rule)->childRules(), medium, resolver, scope, hasDocumentSecurityOrigin, addRuleFlags);
    }
}

void ElementRuleCollector::collectRuleIfMatches(const RuleData& ruleData, CascadeOrder cascadeOrder, const MatchRequest& matchRequest)
{
    StyleRule* rule = ruleData.rule();
    if (ruleMatches(ruleData)) {
        // If the rule has no properties to apply, then ignore it in the non-debug mode.
        const StylePropertySet& properties = rule->properties();
        if (properties.isEmpty())
            return;

        // Add this rule to our list of matched rules.
        addMatchedRule(&ruleData, cascadeOrder, matchRequest.styleSheetIndex, matchRequest.styleSheet);
    }
}

StyleRuleBase* BisonCSSParser::createStyleRule(Vector<OwnPtr<CSSParserSelector>>* selectors)
{
    StyleRule* result = 0;
    if (selectors) {
        m_allowImportRules = m_allowNamespaceDeclarations = false;
        RefPtrWillBeRawPtr<StyleRule> rule = StyleRule::create();
        rule->parserAdoptSelectorVector(*selectors);
        rule->setProperties(createStylePropertySet());
        result = rule.get();
        m_parsedRules.append(rule.release());
        CSSSelectorParser::recordSelectorStats(m_context, result->selectorList());
    }
    clearProperties();
    return result;
}

void ElementRuleCollector::collectMatchingRulesForList(const Vector<RuleData>* rules, const MatchRequest& matchRequest, StyleResolver::RuleRange& ruleRange)
{
    if (!rules)
        return;

    for (unsigned i = 0, size = rules->size(); i < size; ++i) {
        const RuleData& ruleData = rules->data()[i];
        if (m_canUseFastReject && m_selectorFilter.fastRejectSelector<RuleData::maximumIdentifierCount>(ruleData.descendantSelectorIdentifierHashes()))
            continue;

        StyleRule* rule = ruleData.rule();
        PseudoId dynamicPseudo = NOPSEUDO;
        if (ruleMatches(ruleData, dynamicPseudo)) {
            // For SharingRules testing, any match is good enough, we don't care what is matched.
            if (m_mode == SelectorChecker::SharingRules || m_mode == SelectorChecker::StyleInvalidation) {
                addMatchedRule(&ruleData);
                break;
            }

            // If the rule has no properties to apply, then ignore it in the non-debug mode.
            const StyleProperties& properties = rule->properties();
            if (properties.isEmpty() && !matchRequest.includeEmptyRules)
                continue;
            // FIXME: Exposing the non-standard getMatchedCSSRules API to web is the only reason this is needed.
            if (m_sameOriginOnly && !ruleData.hasDocumentSecurityOrigin())
                continue;
            // 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::CollectingRules)
                    continue;
                if (dynamicPseudo < FIRST_INTERNAL_PSEUDOID && m_style)
                    m_style->setHasPseudoStyle(dynamicPseudo);
            } else {
                // Update our first/last rule indices in the matched rules array.
                ++ruleRange.lastRuleIndex;
                if (ruleRange.firstRuleIndex == -1)
                    ruleRange.firstRuleIndex = ruleRange.lastRuleIndex;

                // Add this rule to our list of matched rules.
                addMatchedRule(&ruleData);
                continue;
            }
        }
    }
}

StyleRule HtmlFormatter::ComputeStyleRule(HtmlToken* t) {
    StyleRule rule;
    // get style rules ordered by specificity
    StyleRule* prevRule = FindStyleRule(Tag_Body, nullptr, 0);
    if (prevRule)
        rule.Merge(*prevRule);
    prevRule = FindStyleRule(Tag_Any, nullptr, 0);
    if (prevRule)
        rule.Merge(*prevRule);
    prevRule = FindStyleRule(t->tag, nullptr, 0);
    if (prevRule)
        rule.Merge(*prevRule);
    // TODO: support multiple class names
    AttrInfo* attr = t->GetAttrByName("class");
    if (attr) {
        prevRule = FindStyleRule(Tag_Any, attr->val, attr->valLen);
        if (prevRule)
            rule.Merge(*prevRule);
        prevRule = FindStyleRule(t->tag, attr->val, attr->valLen);
        if (prevRule)
            rule.Merge(*prevRule);
    }
    attr = t->GetAttrByName("style");
    if (attr) {
        StyleRule newRule = StyleRule::Parse(attr->val, attr->valLen);
        rule.Merge(newRule);
    }
    return rule;
}

void ElementRuleCollector::collectRuleIfMatches(const RuleData& ruleData, SelectorChecker::ContextFlags contextFlags, CascadeScope cascadeScope, CascadeOrder cascadeOrder, const MatchRequest& matchRequest, RuleRange& ruleRange)
{
    StyleRule* rule = ruleData.rule();
    if (ruleMatches(ruleData, matchRequest.scope, contextFlags)) {
        // If the rule has no properties to apply, then ignore it in the non-debug mode.
        const StylePropertySet& properties = rule->properties();
        if (properties.isEmpty() && !matchRequest.includeEmptyRules)
            return;

        // Update our first/last rule indices in the matched rules array.
        ++ruleRange.lastRuleIndex;
        if (ruleRange.firstRuleIndex == -1)
            ruleRange.firstRuleIndex = ruleRange.lastRuleIndex;

        // Add this rule to our list of matched rules.
        addMatchedRule(&ruleData, cascadeScope, cascadeOrder, matchRequest.styleSheetIndex, matchRequest.styleSheet);
    }
}

void HtmlFormatter::ParseStyleSheet(const char* data, size_t len) {
    CssPullParser parser(data, len);
    while (parser.NextRule()) {
        StyleRule rule = StyleRule::Parse(&parser);
        const CssSelector* sel;
        while ((sel = parser.NextSelector()) != nullptr) {
            if (Tag_NotFound == sel->tag)
                continue;
            StyleRule* prevRule = FindStyleRule(sel->tag, sel->clazz, sel->clazzLen);
            if (prevRule) {
                prevRule->Merge(rule);
            } else {
                rule.tag = sel->tag;
                rule.classHash = sel->clazz ? MurmurHash2(sel->clazz, sel->clazzLen) : 0;
                styleRules.Append(rule);
            }
        }
    }
}

void StyleInvalidationAnalysis::analyzeStyleSheet(StyleSheetContents* styleSheetContents)
{
    ASSERT(!styleSheetContents->isLoading());

    // See if all rules on the sheet are scoped to some specific ids or classes.
    // Then test if we actually have any of those in the tree at the moment.
    const Vector<RefPtr<StyleRuleImport> >& importRules = styleSheetContents->importRules();
    for (unsigned i = 0; i < importRules.size(); ++i) {
        if (!importRules[i]->styleSheet())
            continue;
        analyzeStyleSheet(importRules[i]->styleSheet());
        if (m_dirtiesAllStyle)
            return;
    }
    if (styleSheetContents->hasSingleOwnerNode()) {
        Node* ownerNode = styleSheetContents->singleOwnerNode();
        if (ownerNode && ownerNode->hasTagName(HTMLNames::styleTag) && toHTMLStyleElement(ownerNode)->isRegisteredAsScoped()) {
            m_scopingNodes.append(determineScopingNodeForStyleScoped(toHTMLStyleElement(ownerNode), styleSheetContents));
            return;
        }
    }

    const Vector<RefPtr<StyleRuleBase> >& rules = styleSheetContents->childRules();
    for (unsigned i = 0; i < rules.size(); i++) {
        StyleRuleBase* rule = rules[i].get();
        if (!rule->isStyleRule()) {
            if (ruleAdditionMightRequireDocumentStyleRecalc(rule)) {
                m_dirtiesAllStyle = true;
                return;
            }
            continue;
        }
        StyleRule* styleRule = toStyleRule(rule);
        if (!determineSelectorScopes(styleRule->selectorList(), m_idScopes, m_classScopes)) {
            m_dirtiesAllStyle = true;
            return;
        }
    }
}