| /* |
| * 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 "config.h" |
| #include "core/css/RuleSet.h" |
| |
| #include "HTMLNames.h" |
| #include "RuntimeEnabledFeatures.h" |
| #include "core/css/CSSFontSelector.h" |
| #include "core/css/CSSSelector.h" |
| #include "core/css/CSSSelectorList.h" |
| #include "core/css/SelectorChecker.h" |
| #include "core/css/SelectorCheckerFastPath.h" |
| #include "core/css/SelectorFilter.h" |
| #include "core/css/StyleRuleImport.h" |
| #include "core/css/StyleSheetContents.h" |
| #include "core/html/track/TextTrackCue.h" |
| #include "platform/TraceEvent.h" |
| #include "platform/weborigin/SecurityOrigin.h" |
| |
| namespace WebCore { |
| |
| using namespace HTMLNames; |
| |
| // ----------------------------------------------------------------- |
| |
| static inline bool isSelectorMatchingHTMLBasedOnRuleHash(const CSSSelector& selector) |
| { |
| if (selector.m_match == CSSSelector::Tag) { |
| const AtomicString& selectorNamespace = selector.tagQName().namespaceURI(); |
| if (selectorNamespace != starAtom && selectorNamespace != xhtmlNamespaceURI) |
| return false; |
| if (selector.relation() == CSSSelector::SubSelector) { |
| ASSERT(selector.tagHistory()); |
| return isSelectorMatchingHTMLBasedOnRuleHash(*selector.tagHistory()); |
| } |
| return true; |
| } |
| if (SelectorChecker::isCommonPseudoClassSelector(selector)) |
| return true; |
| return selector.m_match == CSSSelector::Id || selector.m_match == CSSSelector::Class; |
| } |
| |
| 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)) { |
| for (const CSSSelector* component = selector; component; component = component->tagHistory()) { |
| if (component->isAttributeSelector()) |
| 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 inline 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->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->pseudoType() == CSSSelector::PseudoCue || (component->m_match == CSSSelector::PseudoElement && component->value() == TextTrackCue::cueShadowPseudoId())) |
| return PropertyWhitelistCue; |
| } |
| return PropertyWhitelistNone; |
| } |
| |
| namespace { |
| |
| // FIXME: Should we move this class to WTF? |
| template<typename T> |
| class TerminatedArrayBuilder { |
| public: |
| explicit TerminatedArrayBuilder(PassOwnPtr<T> array) |
| : m_array(array) |
| , m_count(0) |
| , m_capacity(0) |
| { |
| if (!m_array) |
| return; |
| for (T* item = m_array.get(); !item->isLastInArray(); ++item) |
| ++m_count; |
| ++m_count; // To count the last item itself. |
| m_capacity = m_count; |
| } |
| |
| void grow(size_t count) |
| { |
| ASSERT(count); |
| if (!m_array) { |
| ASSERT(!m_count); |
| ASSERT(!m_capacity); |
| m_capacity = count; |
| m_array = adoptPtr(static_cast<T*>(fastMalloc(m_capacity * sizeof(T)))); |
| return; |
| } |
| m_capacity += count; |
| m_array = adoptPtr(static_cast<T*>(fastRealloc(m_array.leakPtr(), m_capacity * sizeof(T)))); |
| m_array.get()[m_count - 1].setLastInArray(false); |
| } |
| |
| void append(const T& item) |
| { |
| RELEASE_ASSERT(m_count < m_capacity); |
| ASSERT(!item.isLastInArray()); |
| m_array.get()[m_count++] = item; |
| } |
| |
| PassOwnPtr<T> release() |
| { |
| RELEASE_ASSERT(m_count == m_capacity); |
| if (m_array) |
| m_array.get()[m_count - 1].setLastInArray(true); |
| assertValid(); |
| return m_array.release(); |
| } |
| |
| private: |
| #ifndef NDEBUG |
| void assertValid() |
| { |
| for (size_t i = 0; i < m_count; ++i) { |
| bool isLastInArray = (i + 1 == m_count); |
| ASSERT(m_array.get()[i].isLastInArray() == isLastInArray); |
| } |
| } |
| #else |
| void assertValid() { } |
| #endif |
| |
| OwnPtr<T> m_array; |
| size_t m_count; |
| size_t m_capacity; |
| }; |
| |
| } |
| |
| RuleData::RuleData(StyleRule* rule, unsigned selectorIndex, unsigned position, AddRuleFlags addRuleFlags) |
| : m_rule(rule) |
| , m_selectorIndex(selectorIndex) |
| , m_isLastInArray(false) |
| , m_position(position) |
| , m_hasFastCheckableSelector((addRuleFlags & RuleCanUseFastCheckSelector) && SelectorCheckerFastPath::canUse(selector())) |
| , m_specificity(selector().specificity()) |
| , m_hasMultipartSelector(!!selector().tagHistory()) |
| , m_hasRightmostSelectorMatchingHTMLBasedOnRuleHash(isSelectorMatchingHTMLBasedOnRuleHash(selector())) |
| , m_containsUncommonAttributeSelector(WebCore::containsUncommonAttributeSelector(selector())) |
| , m_linkMatchType(SelectorChecker::determineLinkMatchType(selector())) |
| , m_hasDocumentSecurityOrigin(addRuleFlags & RuleHasDocumentSecurityOrigin) |
| , m_propertyWhitelistType(determinePropertyWhitelistType(addRuleFlags, selector())) |
| { |
| ASSERT(m_position == position); |
| ASSERT(m_selectorIndex == selectorIndex); |
| SelectorFilter::collectIdentifierHashes(selector(), m_descendantSelectorIdentifierHashes, maximumIdentifierCount); |
| } |
| |
| void RuleSet::addToRuleSet(const AtomicString& key, PendingRuleMap& map, const RuleData& ruleData) |
| { |
| OwnPtr<LinkedStack<RuleData> >& rules = map.add(key, nullptr).storedValue->value; |
| if (!rules) |
| rules = adoptPtr(new LinkedStack<RuleData>); |
| rules->push(ruleData); |
| } |
| |
| static void extractValuesforSelector(const CSSSelector* selector, AtomicString& id, AtomicString& className, AtomicString& customPseudoElementName, AtomicString& tagName) |
| { |
| switch (selector->m_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; |
| } |
| if (selector->isCustomPseudoElement()) |
| 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->relation() == CSSSelector::SubSelector; it = it->tagHistory()) { |
| extractValuesforSelector(it, id, className, customPseudoElementName, tagName); |
| } |
| 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; |
| } |
| |
| if (component.pseudoType() == CSSSelector::PseudoCue) { |
| m_cuePseudoRules.append(ruleData); |
| return true; |
| } |
| |
| if (SelectorChecker::isCommonPseudoClassSelector(component)) { |
| switch (component.pseudoType()) { |
| case CSSSelector::PseudoLink: |
| case CSSSelector::PseudoVisited: |
| case CSSSelector::PseudoAnyLink: |
| m_linkPseudoClassRules.append(ruleData); |
| return true; |
| case CSSSelector::PseudoFocus: |
| m_focusPseudoClassRules.append(ruleData); |
| return true; |
| default: |
| ASSERT_NOT_REACHED(); |
| return true; |
| } |
| } |
| |
| if (!tagName.isEmpty()) { |
| addToRuleSet(tagName, ensurePendingRules()->tagRules, ruleData); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| void RuleSet::addRule(StyleRule* rule, unsigned selectorIndex, AddRuleFlags addRuleFlags) |
| { |
| RuleData ruleData(rule, selectorIndex, m_ruleCount++, addRuleFlags); |
| m_features.collectFeaturesFromRuleData(ruleData); |
| |
| 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::addViewportRule(StyleRuleViewport* rule) |
| { |
| ensurePendingRules(); // So that m_viewportRules.shrinkToFit() gets called. |
| m_viewportRules.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 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)) { |
| if (selectorList.hasCombinatorCrossingTreeBoundaryAt(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::addRulesFromSheet(StyleSheetContents* sheet, const MediaQueryEvaluator& medium, AddRuleFlags addRuleFlags) |
| { |
| TRACE_EVENT0("webkit", "RuleSet::addRulesFromSheet"); |
| |
| ASSERT(sheet); |
| |
| addRuleFlags = static_cast<AddRuleFlags>(addRuleFlags | RuleCanUseFastCheckSelector); |
| 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(), &m_viewportDependentMediaQueryResults))) |
| 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) |
| { |
| PendingRuleMap::iterator end = pendingMap.end(); |
| for (PendingRuleMap::iterator it = pendingMap.begin(); it != end; ++it) { |
| OwnPtr<LinkedStack<RuleData> > pendingRules = it->value.release(); |
| CompactRuleMap::ValueType* compactRules = compactMap.add(it->key, nullptr).storedValue; |
| |
| TerminatedArrayBuilder<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); |
| OwnPtr<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_universalRules.shrinkToFit(); |
| m_pageRules.shrinkToFit(); |
| m_viewportRules.shrinkToFit(); |
| m_fontFaceRules.shrinkToFit(); |
| m_keyframesRules.shrinkToFit(); |
| m_treeBoundaryCrossingRules.shrinkToFit(); |
| m_shadowDistributedRules.shrinkToFit(); |
| } |
| |
| #ifndef NDEBUG |
| |
| void RuleSet::show() |
| { |
| for (Vector<RuleData>::const_iterator it = m_allRules.begin(); it != m_allRules.end(); ++it) |
| it->selector().show(); |
| } |
| #endif |
| |
| } // namespace WebCore |