| /* |
| * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
| * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple 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. |
| * |
| */ |
| |
| #ifndef RuleSet_h |
| #define RuleSet_h |
| |
| #include "core/css/RuleFeature.h" |
| #include "core/css/StyleRule.h" |
| #include "wtf/Forward.h" |
| #include "wtf/HashMap.h" |
| #include "wtf/LinkedStack.h" |
| |
| namespace WebCore { |
| |
| enum AddRuleFlags { |
| RuleHasNoSpecialState = 0, |
| RuleHasDocumentSecurityOrigin = 1, |
| RuleCanUseFastCheckSelector = 1 << 1, |
| RuleIsInRegionRule = 1 << 2, |
| }; |
| |
| enum PropertyWhitelistType { |
| PropertyWhitelistNone = 0, |
| PropertyWhitelistRegion, |
| PropertyWhitelistCue |
| }; |
| |
| class CSSSelector; |
| class ContainerNode; |
| class MediaQueryEvaluator; |
| class StyleResolver; |
| class StyleRuleRegion; |
| class StyleSheetContents; |
| |
| class RuleData { |
| WTF_MAKE_FAST_ALLOCATED; |
| public: |
| RuleData(StyleRule*, unsigned selectorIndex, unsigned position, AddRuleFlags); |
| |
| unsigned position() const { return m_position; } |
| StyleRule* rule() const { return m_rule; } |
| const CSSSelector* selector() const { return m_rule->selectorList().selectorAt(m_selectorIndex); } |
| unsigned selectorIndex() const { return m_selectorIndex; } |
| |
| bool isLastInArray() const { return m_isLastInArray; } |
| void setLastInArray(bool flag) { m_isLastInArray = flag; } |
| |
| bool hasFastCheckableSelector() const { return m_hasFastCheckableSelector; } |
| bool hasMultipartSelector() const { return m_hasMultipartSelector; } |
| bool hasRightmostSelectorMatchingHTMLBasedOnRuleHash() const { return m_hasRightmostSelectorMatchingHTMLBasedOnRuleHash; } |
| bool containsUncommonAttributeSelector() const { return m_containsUncommonAttributeSelector; } |
| unsigned specificity() const { return m_specificity; } |
| unsigned linkMatchType() const { return m_linkMatchType; } |
| bool hasDocumentSecurityOrigin() const { return m_hasDocumentSecurityOrigin; } |
| PropertyWhitelistType propertyWhitelistType(bool isMatchingUARules = false) const { return isMatchingUARules ? PropertyWhitelistNone : static_cast<PropertyWhitelistType>(m_propertyWhitelistType); } |
| // Try to balance between memory usage (there can be lots of RuleData objects) and good filtering performance. |
| static const unsigned maximumIdentifierCount = 4; |
| const unsigned* descendantSelectorIdentifierHashes() const { return m_descendantSelectorIdentifierHashes; } |
| |
| private: |
| StyleRule* m_rule; |
| unsigned m_selectorIndex : 12; |
| unsigned m_isLastInArray : 1; // We store an array of RuleData objects in a primitive array. |
| // This number was picked fairly arbitrarily. We can probably lower it if we need to. |
| // Some simple testing showed <100,000 RuleData's on large sites. |
| unsigned m_position : 18; |
| unsigned m_hasFastCheckableSelector : 1; |
| unsigned m_specificity : 24; |
| unsigned m_hasMultipartSelector : 1; |
| unsigned m_hasRightmostSelectorMatchingHTMLBasedOnRuleHash : 1; |
| unsigned m_containsUncommonAttributeSelector : 1; |
| unsigned m_linkMatchType : 2; // SelectorChecker::LinkMatchMask |
| unsigned m_hasDocumentSecurityOrigin : 1; |
| unsigned m_propertyWhitelistType : 2; |
| // Use plain array instead of a Vector to minimize memory overhead. |
| unsigned m_descendantSelectorIdentifierHashes[maximumIdentifierCount]; |
| }; |
| |
| struct SameSizeAsRuleData { |
| void* a; |
| unsigned b; |
| unsigned c; |
| unsigned d[4]; |
| }; |
| |
| COMPILE_ASSERT(sizeof(RuleData) == sizeof(SameSizeAsRuleData), RuleData_should_stay_small); |
| |
| class RuleSet { |
| WTF_MAKE_NONCOPYABLE(RuleSet); WTF_MAKE_FAST_ALLOCATED; |
| public: |
| static PassOwnPtr<RuleSet> create() { return adoptPtr(new RuleSet); } |
| |
| void addRulesFromSheet(StyleSheetContents*, const MediaQueryEvaluator&, StyleResolver* = 0, const ContainerNode* = 0); |
| void addStyleRule(StyleRule*, AddRuleFlags); |
| void addRule(StyleRule*, unsigned selectorIndex, AddRuleFlags); |
| |
| const RuleFeatureSet& features() const { return m_features; } |
| |
| const RuleData* idRules(StringImpl* key) const { ASSERT(!m_pendingRules); return m_idRules.get(key); } |
| const RuleData* classRules(StringImpl* key) const { ASSERT(!m_pendingRules); return m_classRules.get(key); } |
| const RuleData* tagRules(StringImpl* key) const { ASSERT(!m_pendingRules); return m_tagRules.get(key); } |
| const RuleData* shadowPseudoElementRules(StringImpl* key) const { ASSERT(!m_pendingRules); return m_shadowPseudoElementRules.get(key); } |
| const Vector<RuleData>* linkPseudoClassRules() const { ASSERT(!m_pendingRules); return &m_linkPseudoClassRules; } |
| const Vector<RuleData>* cuePseudoRules() const { ASSERT(!m_pendingRules); return &m_cuePseudoRules; } |
| const Vector<RuleData>* focusPseudoClassRules() const { ASSERT(!m_pendingRules); return &m_focusPseudoClassRules; } |
| const Vector<RuleData>* universalRules() const { ASSERT(!m_pendingRules); return &m_universalRules; } |
| const Vector<StyleRulePage*>& pageRules() const { ASSERT(!m_pendingRules); return m_pageRules; } |
| const Vector<StyleRuleViewport*>& viewportRules() const { ASSERT(!m_pendingRules); return m_viewportRules; } |
| |
| unsigned ruleCount() const { return m_ruleCount; } |
| |
| void compactRulesIfNeeded() |
| { |
| if (!m_pendingRules) |
| return; |
| compactRules(); |
| } |
| |
| struct RuleSetSelectorPair { |
| RuleSetSelectorPair(const CSSSelector* selector, PassOwnPtr<RuleSet> ruleSet) : selector(selector), ruleSet(ruleSet) { } |
| RuleSetSelectorPair(const RuleSetSelectorPair& rs) : selector(rs.selector), ruleSet(const_cast<RuleSetSelectorPair*>(&rs)->ruleSet.release()) { } |
| |
| const CSSSelector* selector; |
| OwnPtr<RuleSet> ruleSet; |
| }; |
| |
| Vector<RuleSetSelectorPair> m_regionSelectorsAndRuleSets; |
| |
| private: |
| typedef HashMap<StringImpl*, OwnPtr<LinkedStack<RuleData> > > PendingRuleMap; |
| typedef HashMap<StringImpl*, OwnPtr<RuleData> > CompactRuleMap; |
| |
| RuleSet() |
| : m_ruleCount(0) |
| { |
| } |
| |
| void addToRuleSet(StringImpl* key, PendingRuleMap&, const RuleData&); |
| void addPageRule(StyleRulePage*); |
| void addViewportRule(StyleRuleViewport*); |
| void addRegionRule(StyleRuleRegion*, bool hasDocumentSecurityOrigin); |
| |
| void addChildRules(const Vector<RefPtr<StyleRuleBase> >&, const MediaQueryEvaluator& medium, StyleResolver*, const ContainerNode* scope, bool hasDocumentSecurityOrigin, AddRuleFlags); |
| bool findBestRuleSetAndAdd(const CSSSelector*, RuleData&); |
| |
| void compactRules(); |
| static void compactPendingRules(PendingRuleMap&, CompactRuleMap&); |
| |
| struct PendingRuleMaps { |
| PendingRuleMap idRules; |
| PendingRuleMap classRules; |
| PendingRuleMap tagRules; |
| PendingRuleMap shadowPseudoElementRules; |
| }; |
| |
| PendingRuleMaps* ensurePendingRules() |
| { |
| if (!m_pendingRules) |
| m_pendingRules = adoptPtr(new PendingRuleMaps); |
| return m_pendingRules.get(); |
| } |
| |
| CompactRuleMap m_idRules; |
| CompactRuleMap m_classRules; |
| CompactRuleMap m_tagRules; |
| CompactRuleMap m_shadowPseudoElementRules; |
| Vector<RuleData> m_linkPseudoClassRules; |
| Vector<RuleData> m_cuePseudoRules; |
| Vector<RuleData> m_focusPseudoClassRules; |
| Vector<RuleData> m_universalRules; |
| RuleFeatureSet m_features; |
| Vector<StyleRulePage*> m_pageRules; |
| Vector<StyleRuleViewport*> m_viewportRules; |
| |
| unsigned m_ruleCount; |
| OwnPtr<PendingRuleMaps> m_pendingRules; |
| }; |
| |
| } // namespace WebCore |
| |
| #endif // RuleSet_h |