C++ MediaQueryEvaluator类代码示例

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 RuleSet::addChildRules(const Vector<RefPtr<StyleRuleBase>>& rules, const MediaQueryEvaluator& medium, StyleResolver* resolver, bool hasDocumentSecurityOrigin, bool isInitiatingElementInUserAgentShadowTree, AddRuleFlags addRuleFlags)
{
    for (auto& rule : rules) {
        if (is<StyleRule>(*rule))
            addStyleRule(downcast<StyleRule>(rule.get()), addRuleFlags);
        else if (is<StyleRulePage>(*rule))
            addPageRule(downcast<StyleRulePage>(rule.get()));
        else if (is<StyleRuleMedia>(*rule)) {
            auto& mediaRule = downcast<StyleRuleMedia>(*rule);
            if ((!mediaRule.mediaQueries() || medium.eval(mediaRule.mediaQueries(), resolver)))
                addChildRules(mediaRule.childRules(), medium, resolver, hasDocumentSecurityOrigin, isInitiatingElementInUserAgentShadowTree, addRuleFlags);
        } else if (is<StyleRuleFontFace>(*rule) && resolver) {
            // Add this font face to our set.
            resolver->document().fontSelector().addFontFaceRule(downcast<StyleRuleFontFace>(*rule.get()), isInitiatingElementInUserAgentShadowTree);
            resolver->invalidateMatchedPropertiesCache();
        } else if (is<StyleRuleKeyframes>(*rule) && resolver)
            resolver->addKeyframeStyle(downcast<StyleRuleKeyframes>(rule.get()));
        else if (is<StyleRuleSupports>(*rule) && downcast<StyleRuleSupports>(*rule).conditionIsSupported())
            addChildRules(downcast<StyleRuleSupports>(*rule).childRules(), medium, resolver, hasDocumentSecurityOrigin, isInitiatingElementInUserAgentShadowTree, addRuleFlags);
#if ENABLE(CSS_REGIONS)
        else if (is<StyleRuleRegion>(*rule) && resolver) {
            addRegionRule(downcast<StyleRuleRegion>(rule.get()), hasDocumentSecurityOrigin);
        }
#endif
#if ENABLE(CSS_DEVICE_ADAPTATION)
        else if (is<StyleRuleViewport>(*rule) && resolver) {
            resolver->viewportStyleResolver()->addViewportRule(downcast<StyleRuleViewport>(rule.get()));
        }
#endif
    }
}

void testMQEvaluator(TestCase* testCases, const MediaQueryEvaluator& mediaQueryEvaluator)
{
    for (unsigned i = 0; testCases[i].input; ++i) {
        RefPtrWillBeRawPtr<MediaQuerySet> querySet = MediaQuerySet::create(testCases[i].input);
        ASSERT_EQ(testCases[i].output, mediaQueryEvaluator.eval(querySet.get()));
    }
}

void testMQEvaluator(TestCase* testCases,
                     const MediaQueryEvaluator& mediaQueryEvaluator) {
  Persistent<MediaQuerySet> querySet = nullptr;
  for (unsigned i = 0; testCases[i].input; ++i) {
    querySet = MediaQuerySet::create(testCases[i].input);
    EXPECT_EQ(testCases[i].output, mediaQueryEvaluator.eval(querySet.get()));
  }
}

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);
            addStyleRule(styleRule, 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 (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 (scope)
                continue;
            resolver->addKeyframeStyle(static_cast<StyleRuleKeyframes*>(rule));
        }
#if ENABLE(CSS_REGIONS)
        else if (rule->isRegionRule() && resolver) {
            // FIXME (BUG 72472): We don't add @-webkit-region rules of scoped style sheets for the moment.
            if (scope)
                continue;
            addRegionRule(static_cast<StyleRuleRegion*>(rule), hasDocumentSecurityOrigin);
        }
#endif
#if ENABLE(SHADOW_DOM)
        else if (rule->isHostRule())
            resolver->addHostRule(static_cast<StyleRuleHost*>(rule), hasDocumentSecurityOrigin, scope);
#endif
#if ENABLE(CSS_DEVICE_ADAPTATION)
        else if (rule->isViewportRule() && resolver) {
            // @viewport should not be scoped.
            if (scope)
                continue;
            resolver->viewportStyleResolver()->addViewportRule(static_cast<StyleRuleViewport*>(rule));
        }
#endif
#if ENABLE(CSS3_CONDITIONAL_RULES)
        else if (rule->isSupportsRule() && static_cast<StyleRuleSupports*>(rule)->conditionIsSupported())
            addChildRules(static_cast<StyleRuleSupports*>(rule)->childRules(), medium, resolver, scope, hasDocumentSecurityOrigin, addRuleFlags);
#endif
    }
}

void RuleSet::addRulesFromSheet(StyleSheetContents* sheet, const MediaQueryEvaluator& medium, AddRuleFlags addRuleFlags)
{
    TRACE_EVENT0("blink", "RuleSet::addRulesFromSheet");

    ASSERT(sheet);

    const WillBeHeapVector<RefPtrWillBeMember<StyleRuleImport>>& importRules = sheet->importRules();
    for (unsigned i = 0; i < importRules.size(); ++i) {
        StyleRuleImport* importRule = importRules[i].get();
        if (importRule->styleSheet() && (!importRule->mediaQueries() || medium.eval(importRule->mediaQueries(), &m_viewportDependentMediaQueryResults)))
            addRulesFromSheet(importRule->styleSheet(), medium, addRuleFlags);
    }

    addChildRules(sheet->childRules(), medium, addRuleFlags);
}

void RuleSet::addRulesFromSheet(StyleSheetContents& sheet, const MediaQueryEvaluator& medium, StyleResolver* resolver)
{
    for (auto& rule : sheet.importRules()) {
        if (rule->styleSheet() && (!rule->mediaQueries() || medium.eval(rule->mediaQueries(), resolver)))
            addRulesFromSheet(*rule->styleSheet(), medium, resolver);
    }

    bool hasDocumentSecurityOrigin = resolver && resolver->document().securityOrigin()->canRequest(sheet.baseURL());
    AddRuleFlags addRuleFlags = static_cast<AddRuleFlags>((hasDocumentSecurityOrigin ? RuleHasDocumentSecurityOrigin : 0));

    // FIXME: Skip Content Security Policy check when stylesheet is in a user agent shadow tree.
    // See <https://bugs.webkit.org/show_bug.cgi?id=146663>.
    bool isInitiatingElementInUserAgentShadowTree = false;
    addChildRules(sheet.childRules(), medium, resolver, hasDocumentSecurityOrigin, isInitiatingElementInUserAgentShadowTree, addRuleFlags);

    if (m_autoShrinkToFitEnabled)
        shrinkToFit();
}

void RuleSet::addChildRules(const Vector<RefPtr<StyleRuleBase>>& rules, const MediaQueryEvaluator& medium, StyleResolver* resolver, 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);
            addStyleRule(styleRule, 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, hasDocumentSecurityOrigin, addRuleFlags);
        } else if (rule->isFontFaceRule() && resolver) {
            // Add this font face to our set.
            const StyleRuleFontFace* fontFaceRule = static_cast<StyleRuleFontFace*>(rule);
            resolver->fontSelector()->addFontFaceRule(fontFaceRule);
            resolver->invalidateMatchedPropertiesCache();
        } else if (rule->isKeyframesRule() && resolver) {
            resolver->addKeyframeStyle(static_cast<StyleRuleKeyframes*>(rule));
        }
#if ENABLE(CSS_REGIONS)
        else if (rule->isRegionRule() && resolver) {
            addRegionRule(static_cast<StyleRuleRegion*>(rule), hasDocumentSecurityOrigin);
        }
#endif
#if ENABLE(CSS_DEVICE_ADAPTATION)
        else if (rule->isViewportRule() && resolver) {
            resolver->viewportStyleResolver()->addViewportRule(static_cast<StyleRuleViewport*>(rule));
        }
#endif
#if ENABLE(CSS3_CONDITIONAL_RULES)
        else if (rule->isSupportsRule() && static_cast<StyleRuleSupports*>(rule)->conditionIsSupported())
            addChildRules(static_cast<StyleRuleSupports*>(rule)->childRules(), medium, resolver, hasDocumentSecurityOrigin, addRuleFlags);
#endif
    }
}

void RuleSet::addChildRules(const Vector<RefPtr<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))
                addRule(styleRule, selectorIndex, addRuleFlags);
        } 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->isSupportsRule() && toStyleRuleSupports(rule)->conditionIsSupported()) {
            addChildRules(toStyleRuleSupports(rule)->childRules(), medium, addRuleFlags);
        }
    }
}

void RuleSet::addRulesFromSheet(StyleSheetContents* sheet, const MediaQueryEvaluator& medium, StyleResolver* resolver, const ContainerNode* scope)
{
    ASSERT(sheet);
    
    const Vector<RefPtr<StyleRuleImport> >& importRules = sheet->importRules();
    for (unsigned i = 0; i < importRules.size(); ++i) {
        StyleRuleImport* importRule = importRules[i].get();
        if (importRule->styleSheet() && (!importRule->mediaQueries() || medium.eval(importRule->mediaQueries(), resolver)))
            addRulesFromSheet(importRule->styleSheet(), medium, resolver, scope);
    }
    bool hasDocumentSecurityOrigin = resolver && resolver->document()->securityOrigin()->canRequest(sheet->baseURL());
    AddRuleFlags addRuleFlags = static_cast<AddRuleFlags>((hasDocumentSecurityOrigin ? RuleHasDocumentSecurityOrigin : 0) | (!scope ? RuleCanUseFastCheckSelector : 0));

    const Vector<RefPtr<StyleRuleBase> >& rules = sheet->childRules();
    for (unsigned i = 0; i < rules.size(); ++i) {
        StyleRuleBase* rule = rules[i].get();

        ASSERT(!rule->isImportRule());
        if (rule->isStyleRule())
            addStyleRule(static_cast<StyleRule*>(rule), 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))) {
                // Traverse child elements of the @media rule.
                const Vector<RefPtr<StyleRuleBase> >& childRules = mediaRule->childRules();
                for (unsigned j = 0; j < childRules.size(); ++j) {
                    StyleRuleBase* childRule = childRules[j].get();
                    if (childRule->isStyleRule())
                        addStyleRule(static_cast<StyleRule*>(childRule), addRuleFlags);
                    else if (childRule->isPageRule())
                        addPageRule(static_cast<StyleRulePage*>(childRule));
                    else if (childRule->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 (scope)
                            continue;
                        const StyleRuleFontFace* fontFaceRule = static_cast<StyleRuleFontFace*>(childRule);
                        resolver->fontSelector()->addFontFaceRule(fontFaceRule);
                        resolver->invalidateMatchedPropertiesCache();
                    } else if (childRule->isKeyframesRule() && resolver) {
                        // Add this keyframe rule to our set.
                        // FIXME(BUG 72462): We don't add @keyframe rules of scoped style sheets for the moment.
                        if (scope)
                            continue;
                        resolver->addKeyframeStyle(static_cast<StyleRuleKeyframes*>(childRule));
                    }
#if ENABLE(CSS_DEVICE_ADAPTATION)
                    else if (childRule->isViewportRule() && resolver && !resolver->affectedByViewportChange()) {
                        // @viewport should not be scoped.
                        if (scope)
                            continue;
                        resolver->viewportStyleResolver()->addViewportRule(static_cast<StyleRuleViewport*>(childRule));
                    }
#endif
                } // for rules
            } // if rules
        } 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 (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 (scope)
                continue;
            resolver->addKeyframeStyle(static_cast<StyleRuleKeyframes*>(rule));
        }
#if ENABLE(CSS_REGIONS)
        else if (rule->isRegionRule() && resolver) {
            // FIXME (BUG 72472): We don't add @-webkit-region rules of scoped style sheets for the moment.
            if (scope)
                continue;
            addRegionRule(static_cast<StyleRuleRegion*>(rule), hasDocumentSecurityOrigin);
        }
#endif
#if ENABLE(SHADOW_DOM)
        else if (rule->isHostRule())
            resolver->addHostRule(static_cast<StyleRuleHost*>(rule), hasDocumentSecurityOrigin, scope);
#endif
#if ENABLE(CSS_DEVICE_ADAPTATION)
        else if (rule->isViewportRule() && resolver) {
            // @viewport should not be scoped.
            if (scope)
                continue;
            resolver->viewportStyleResolver()->addViewportRule(static_cast<StyleRuleViewport*>(rule));
        }
#endif
    }
    if (m_autoShrinkToFitEnabled)
        shrinkToFit();
}