| /* |
| * 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, 2006, 2007, 2008, 2009, 2010, 2011, 2012 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 "core/css/RuleSet.h" |
| |
| #include "core/HTMLNames.h" |
| #include "core/css/CSSFontSelector.h" |
| #include "core/css/CSSSelector.h" |
| #include "core/css/CSSSelectorList.h" |
| #include "core/css/SelectorFilter.h" |
| #include "core/css/StyleRuleImport.h" |
| #include "core/css/StyleSheetContents.h" |
| #include "core/html/track/TextTrackCue.h" |
| #include "platform/RuntimeEnabledFeatures.h" |
| #include "platform/heap/HeapTerminatedArrayBuilder.h" |
| #include "platform/tracing/TraceEvent.h" |
| #include "platform/weborigin/SecurityOrigin.h" |
| |
| #include "wtf/TerminatedArrayBuilder.h" |
| |
| namespace blink { |
| |
| using namespace HTMLNames; |
| |
| // ----------------------------------------------------------------- |
| |
| static bool containsUncommonAttributeSelector(const CSSSelector&); |
| |
| static inline bool selectorListContainsUncommonAttributeSelector( |
| const CSSSelector* selector) { |
| const CSSSelectorList* selectorList = selector->selectorList(); |
| if (!selectorList) |
| return false; |
| for (const CSSSelector* selector = selectorList->first(); selector; |
| selector = CSSSelectorList::next(*selector)) { |
| if (containsUncommonAttributeSelector(*selector)) |
| return true; |
| } |
| return false; |
| } |
| |
| static inline bool isCommonAttributeSelectorAttribute( |
| const QualifiedName& attribute) { |
| // These are explicitly tested for equality in canShareStyleWithElement. |
| return attribute == typeAttr || attribute == readonlyAttr; |
| } |
| |
| static bool containsUncommonAttributeSelector(const CSSSelector& selector) { |
| const CSSSelector* current = &selector; |
| for (; current; current = current->tagHistory()) { |
| // Allow certain common attributes (used in the default style) in the |
| // selectors that match the current element. |
| if (current->isAttributeSelector() && |
| !isCommonAttributeSelectorAttribute(current->attribute())) |
| return true; |
| if (selectorListContainsUncommonAttributeSelector(current)) |
| return true; |
| if (current->relationIsAffectedByPseudoContent() || |
| current->getPseudoType() == CSSSelector::PseudoSlotted) |
| return false; |
| if (current->relation() != CSSSelector::SubSelector) { |
| current = current->tagHistory(); |
| break; |
| } |
| } |
| |
| for (; current; current = current->tagHistory()) { |
| if (current->isAttributeSelector()) |
| return true; |
| if (selectorListContainsUncommonAttributeSelector(current)) |
| return true; |
| } |
| return false; |
| } |
| |
| static inline PropertyWhitelistType determinePropertyWhitelistType( |
| const AddRuleFlags addRuleFlags, |
| const CSSSelector& selector) { |
| for (const CSSSelector* component = &selector; component; |
| component = component->tagHistory()) { |
| if (component->getPseudoType() == CSSSelector::PseudoCue || |
| (component->match() == CSSSelector::PseudoElement && |
| component->value() == TextTrackCue::cueShadowPseudoId())) |
| return PropertyWhitelistCue; |
| if (component->getPseudoType() == CSSSelector::PseudoFirstLetter) |
| return PropertyWhitelistFirstLetter; |
| } |
| return PropertyWhitelistNone; |
| } |
| |
| RuleData::RuleData(StyleRule* rule, |
| unsigned selectorIndex, |
| unsigned position, |
| AddRuleFlags addRuleFlags) |
| : m_rule(rule), |
| m_selectorIndex(selectorIndex), |
| m_isLastInArray(false), |
| m_position(position), |
| m_specificity(selector().specificity()), |
| m_containsUncommonAttributeSelector( |
| blink::containsUncommonAttributeSelector(selector())), |
| m_linkMatchType(selector().computeLinkMatchType()), |
| m_hasDocumentSecurityOrigin(addRuleFlags & RuleHasDocumentSecurityOrigin), |
| m_propertyWhitelist( |
| determinePropertyWhitelistType(addRuleFlags, selector())) { |
| SelectorFilter::collectIdentifierHashes( |
| selector(), m_descendantSelectorIdentifierHashes, maximumIdentifierCount); |
| } |
| |
| void RuleSet::addToRuleSet(const AtomicString& key, |
| PendingRuleMap& map, |
| const RuleData& ruleData) { |
| Member<HeapLinkedStack<RuleData>>& rules = |
| map.add(key, nullptr).storedValue->value; |
| if (!rules) |
| rules = new HeapLinkedStack<RuleData>; |
| rules->push(ruleData); |
| } |
| |
| static void extractValuesforSelector(const CSSSelector* selector, |
| AtomicString& id, |
| AtomicString& className, |
| AtomicString& customPseudoElementName, |
| AtomicString& tagName) { |
| switch (selector->match()) { |
| case CSSSelector::Id: |
| id = selector->value(); |
| break; |
| case CSSSelector::Class: |
| className = selector->value(); |
| break; |
| case CSSSelector::Tag: |
| if (selector->tagQName().localName() != starAtom) |
| tagName = selector->tagQName().localName(); |
| break; |
| default: |
| break; |
| } |
| if (selector->getPseudoType() == CSSSelector::PseudoWebKitCustomElement || |
| selector->getPseudoType() == CSSSelector::PseudoBlinkInternalElement) |
| customPseudoElementName = selector->value(); |
| } |
| |
| bool RuleSet::findBestRuleSetAndAdd(const CSSSelector& component, |
| RuleData& ruleData) { |
| AtomicString id; |
| AtomicString className; |
| AtomicString customPseudoElementName; |
| AtomicString tagName; |
| |
| #ifndef NDEBUG |
| m_allRules.append(ruleData); |
| #endif |
| |
| const CSSSelector* it = &component; |
| for (; it && it->relation() == CSSSelector::SubSelector; |
| it = it->tagHistory()) |
| extractValuesforSelector(it, id, className, customPseudoElementName, |
| tagName); |
| if (it) |
| extractValuesforSelector(it, id, className, customPseudoElementName, |
| tagName); |
| |
| // Prefer rule sets in order of most likely to apply infrequently. |
| if (!id.isEmpty()) { |
| addToRuleSet(id, ensurePendingRules()->idRules, ruleData); |
| return true; |
| } |
| if (!className.isEmpty()) { |
| addToRuleSet(className, ensurePendingRules()->classRules, ruleData); |
| return true; |
| } |
| if (!customPseudoElementName.isEmpty()) { |
| // Custom pseudos come before ids and classes in the order of tagHistory, |
| // and have a relation of ShadowPseudo between them. Therefore we should |
| // never be a situation where extractValuesforSelector finsd id and |
| // className in addition to custom pseudo. |
| ASSERT(id.isEmpty() && className.isEmpty()); |
| addToRuleSet(customPseudoElementName, |
| ensurePendingRules()->shadowPseudoElementRules, ruleData); |
| return true; |
| } |
| |
| switch (component.getPseudoType()) { |
| case CSSSelector::PseudoCue: |
| m_cuePseudoRules.append(ruleData); |
| return true; |
| case CSSSelector::PseudoLink: |
| case CSSSelector::PseudoVisited: |
| case CSSSelector::PseudoAnyLink: |
| m_linkPseudoClassRules.append(ruleData); |
| return true; |
| case CSSSelector::PseudoFocus: |
| m_focusPseudoClassRules.append(ruleData); |
| return true; |
| case CSSSelector::PseudoPlaceholder: |
| m_placeholderPseudoRules.append(ruleData); |
| return true; |
| default: |
| break; |
| } |
| |
| if (!tagName.isEmpty()) { |
| addToRuleSet(tagName, ensurePendingRules()->tagRules, ruleData); |
| return true; |
| } |
| |
| if (component.isHostPseudoClass()) { |
| m_shadowHostRules.append(ruleData); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| void RuleSet::addRule(StyleRule* rule, |
| unsigned selectorIndex, |
| AddRuleFlags addRuleFlags) { |
| RuleData ruleData(rule, selectorIndex, m_ruleCount++, addRuleFlags); |
| if (m_features.collectFeaturesFromRuleData(ruleData) == |
| RuleFeatureSet::SelectorNeverMatches) |
| return; |
| |
| if (!findBestRuleSetAndAdd(ruleData.selector(), ruleData)) { |
| // If we didn't find a specialized map to stick it in, file under universal |
| // rules. |
| m_universalRules.append(ruleData); |
| } |
| } |
| |
| void RuleSet::addPageRule(StyleRulePage* rule) { |
| ensurePendingRules(); // So that m_pageRules.shrinkToFit() gets called. |
| m_pageRules.append(rule); |
| } |
| |
| void RuleSet::addFontFaceRule(StyleRuleFontFace* rule) { |
| ensurePendingRules(); // So that m_fontFaceRules.shrinkToFit() gets called. |
| m_fontFaceRules.append(rule); |
| } |
| |
| void RuleSet::addKeyframesRule(StyleRuleKeyframes* rule) { |
| ensurePendingRules(); // So that m_keyframesRules.shrinkToFit() gets called. |
| m_keyframesRules.append(rule); |
| } |
| |
| void RuleSet::addChildRules(const HeapVector<Member<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 (const CSSSelector* selector = selectorList.first(); selector; |
| selector = selectorList.next(*selector)) { |
| size_t selectorIndex = selectorList.selectorIndex(*selector); |
| if (selector->hasDeepCombinatorOrShadowPseudo()) { |
| m_deepCombinatorOrShadowPseudoRules.append( |
| MinimalRuleData(styleRule, selectorIndex, addRuleFlags)); |
| } else if (selector->hasContentPseudo()) { |
| m_contentPseudoElementRules.append( |
| MinimalRuleData(styleRule, selectorIndex, addRuleFlags)); |
| } else if (selector->hasSlottedPseudo()) { |
| m_slottedPseudoElementRules.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, |
| &m_deviceDependentMediaQueryResults))) |
| 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, |
| AddRuleFlags addRuleFlags) { |
| TRACE_EVENT0("blink", "RuleSet::addRulesFromSheet"); |
| |
| ASSERT(sheet); |
| |
| const HeapVector<Member<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, |
| &m_deviceDependentMediaQueryResults))) |
| addRulesFromSheet(importRule->styleSheet(), medium, addRuleFlags); |
| } |
| |
| addChildRules(sheet->childRules(), medium, addRuleFlags); |
| } |
| |
| void RuleSet::addStyleRule(StyleRule* rule, AddRuleFlags addRuleFlags) { |
| for (size_t selectorIndex = 0; selectorIndex != kNotFound; |
| selectorIndex = |
| rule->selectorList().indexOfNextSelectorAfter(selectorIndex)) |
| addRule(rule, selectorIndex, addRuleFlags); |
| } |
| |
| void RuleSet::compactPendingRules(PendingRuleMap& pendingMap, |
| CompactRuleMap& compactMap) { |
| for (auto& item : pendingMap) { |
| HeapLinkedStack<RuleData>* pendingRules = item.value.release(); |
| CompactRuleMap::ValueType* compactRules = |
| compactMap.add(item.key, nullptr).storedValue; |
| |
| HeapTerminatedArrayBuilder<RuleData> builder(compactRules->value.release()); |
| builder.grow(pendingRules->size()); |
| while (!pendingRules->isEmpty()) { |
| builder.append(pendingRules->peek()); |
| pendingRules->pop(); |
| } |
| |
| compactRules->value = builder.release(); |
| } |
| } |
| |
| void RuleSet::compactRules() { |
| ASSERT(m_pendingRules); |
| PendingRuleMaps* pendingRules = m_pendingRules.release(); |
| compactPendingRules(pendingRules->idRules, m_idRules); |
| compactPendingRules(pendingRules->classRules, m_classRules); |
| compactPendingRules(pendingRules->tagRules, m_tagRules); |
| compactPendingRules(pendingRules->shadowPseudoElementRules, |
| m_shadowPseudoElementRules); |
| m_linkPseudoClassRules.shrinkToFit(); |
| m_cuePseudoRules.shrinkToFit(); |
| m_focusPseudoClassRules.shrinkToFit(); |
| m_placeholderPseudoRules.shrinkToFit(); |
| m_universalRules.shrinkToFit(); |
| m_shadowHostRules.shrinkToFit(); |
| m_pageRules.shrinkToFit(); |
| m_fontFaceRules.shrinkToFit(); |
| m_keyframesRules.shrinkToFit(); |
| m_deepCombinatorOrShadowPseudoRules.shrinkToFit(); |
| m_contentPseudoElementRules.shrinkToFit(); |
| m_slottedPseudoElementRules.shrinkToFit(); |
| } |
| |
| DEFINE_TRACE(MinimalRuleData) { |
| visitor->trace(m_rule); |
| } |
| |
| DEFINE_TRACE(RuleData) { |
| visitor->trace(m_rule); |
| } |
| |
| DEFINE_TRACE(RuleSet::PendingRuleMaps) { |
| visitor->trace(idRules); |
| visitor->trace(classRules); |
| visitor->trace(tagRules); |
| visitor->trace(shadowPseudoElementRules); |
| } |
| |
| DEFINE_TRACE(RuleSet) { |
| visitor->trace(m_idRules); |
| visitor->trace(m_classRules); |
| visitor->trace(m_tagRules); |
| visitor->trace(m_shadowPseudoElementRules); |
| visitor->trace(m_linkPseudoClassRules); |
| visitor->trace(m_cuePseudoRules); |
| visitor->trace(m_focusPseudoClassRules); |
| visitor->trace(m_placeholderPseudoRules); |
| visitor->trace(m_universalRules); |
| visitor->trace(m_shadowHostRules); |
| visitor->trace(m_features); |
| visitor->trace(m_pageRules); |
| visitor->trace(m_fontFaceRules); |
| visitor->trace(m_keyframesRules); |
| visitor->trace(m_deepCombinatorOrShadowPseudoRules); |
| visitor->trace(m_contentPseudoElementRules); |
| visitor->trace(m_slottedPseudoElementRules); |
| visitor->trace(m_viewportDependentMediaQueryResults); |
| visitor->trace(m_deviceDependentMediaQueryResults); |
| visitor->trace(m_pendingRules); |
| #ifndef NDEBUG |
| visitor->trace(m_allRules); |
| #endif |
| } |
| |
| #ifndef NDEBUG |
| void RuleSet::show() const { |
| for (const auto& rule : m_allRules) |
| rule.selector().show(); |
| } |
| #endif |
| |
| } // namespace blink |
