1 /* 2 * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org) 3 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved. 4 * 5 * This library is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU Library General Public 7 * License as published by the Free Software Foundation; either 8 * version 2 of the License, or (at your option) any later version. 9 * 10 * This library is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * Library General Public License for more details. 14 * 15 * You should have received a copy of the GNU Library General Public License 16 * along with this library; see the file COPYING.LIB. If not, write to 17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 18 * Boston, MA 02110-1301, USA. 19 * 20 */ 21 22 #ifndef ElementRuleCollector_h 23 #define ElementRuleCollector_h 24 25 #include "core/css/PseudoStyleRequest.h" 26 #include "core/css/SelectorChecker.h" 27 #include "core/css/resolver/ElementResolveContext.h" 28 #include "core/css/resolver/MatchRequest.h" 29 #include "core/css/resolver/MatchResult.h" 30 #include "wtf/RefPtr.h" 31 #include "wtf/Vector.h" 32 33 namespace blink { 34 35 class CSSStyleSheet; 36 class CSSRuleList; 37 class RuleData; 38 class RuleSet; 39 class SelectorFilter; 40 class StaticCSSRuleList; 41 42 typedef unsigned CascadeScope; 43 typedef unsigned CascadeOrder; 44 45 const CascadeScope ignoreCascadeScope = 0; 46 const CascadeOrder ignoreCascadeOrder = 0; 47 48 class MatchedRule { 49 ALLOW_ONLY_INLINE_ALLOCATION(); 50 public: 51 MatchedRule(const RuleData* ruleData, unsigned specificity, CascadeScope cascadeScope, CascadeOrder cascadeOrder, unsigned styleSheetIndex, const CSSStyleSheet* parentStyleSheet) 52 : m_ruleData(ruleData) 53 , m_specificity(specificity) 54 , m_cascadeScope(cascadeScope) 55 , m_parentStyleSheet(parentStyleSheet) 56 { 57 ASSERT(m_ruleData); 58 static const unsigned BitsForPositionInRuleData = 18; 59 static const unsigned BitsForStyleSheetIndex = 32; 60 m_position = ((uint64_t)cascadeOrder << (BitsForStyleSheetIndex + BitsForPositionInRuleData)) + ((uint64_t)styleSheetIndex << BitsForPositionInRuleData)+ m_ruleData->position(); 61 } 62 63 const RuleData* ruleData() const { return m_ruleData; } 64 uint32_t cascadeScope() const { return m_cascadeScope; } 65 uint64_t position() const { return m_position; } 66 unsigned specificity() const { return ruleData()->specificity() + m_specificity; } 67 const CSSStyleSheet* parentStyleSheet() const { return m_parentStyleSheet; } 68 void trace(Visitor* visitor) 69 { 70 visitor->trace(m_parentStyleSheet); 71 } 72 73 private: 74 // FIXME: Oilpan: RuleData is in the oilpan heap and this pointer 75 // really should be traced. However, RuleData objects are 76 // allocated inside larger TerminatedArray objects and we cannot 77 // trace a raw rule data pointer at this point. 78 const RuleData* m_ruleData; 79 unsigned m_specificity; 80 CascadeScope m_cascadeScope; 81 uint64_t m_position; 82 RawPtrWillBeMember<const CSSStyleSheet> m_parentStyleSheet; 83 }; 84 85 } // namespace blink 86 87 WTF_ALLOW_MOVE_AND_INIT_WITH_MEM_FUNCTIONS(blink::MatchedRule); 88 89 namespace blink { 90 91 // FIXME: oilpan: when transition types are gone this class can be replaced with HeapVector. 92 class StyleRuleList FINAL : public RefCountedWillBeGarbageCollected<StyleRuleList> { 93 public: 94 static PassRefPtrWillBeRawPtr<StyleRuleList> create() { return adoptRefWillBeNoop(new StyleRuleList()); } 95 96 void trace(Visitor* visitor) 97 { 98 #if ENABLE(OILPAN) 99 visitor->trace(m_list); 100 #endif 101 } 102 103 WillBeHeapVector<RawPtrWillBeMember<StyleRule> > m_list; 104 }; 105 106 // ElementRuleCollector is designed to be used as a stack object. 107 // Create one, ask what rules the ElementResolveContext matches 108 // and then let it go out of scope. 109 // FIXME: Currently it modifies the RenderStyle but should not! 110 class ElementRuleCollector { 111 STACK_ALLOCATED(); 112 WTF_MAKE_NONCOPYABLE(ElementRuleCollector); 113 public: 114 ElementRuleCollector(const ElementResolveContext&, const SelectorFilter&, RenderStyle* = 0); 115 ~ElementRuleCollector(); 116 117 void setMode(SelectorChecker::Mode mode) { m_mode = mode; } 118 void setPseudoStyleRequest(const PseudoStyleRequest& request) { m_pseudoStyleRequest = request; } 119 void setSameOriginOnly(bool f) { m_sameOriginOnly = f; } 120 121 void setMatchingUARules(bool matchingUARules) { m_matchingUARules = matchingUARules; } 122 bool hasAnyMatchingRules(RuleSet*); 123 124 MatchResult& matchedResult(); 125 PassRefPtrWillBeRawPtr<StyleRuleList> matchedStyleRuleList(); 126 PassRefPtrWillBeRawPtr<CSSRuleList> matchedCSSRuleList(); 127 128 void collectMatchingRules(const MatchRequest&, RuleRange&, SelectorChecker::ContextFlags = SelectorChecker::DefaultBehavior, CascadeScope = ignoreCascadeScope, CascadeOrder = ignoreCascadeOrder, bool matchingTreeBoundaryRules = false); 129 void sortAndTransferMatchedRules(); 130 void clearMatchedRules(); 131 void addElementStyleProperties(const StylePropertySet*, bool isCacheable = true); 132 133 private: 134 void collectRuleIfMatches(const RuleData&, SelectorChecker::ContextFlags, CascadeScope, CascadeOrder, const MatchRequest&, RuleRange&); 135 136 template<typename RuleDataListType> 137 void collectMatchingRulesForList(const RuleDataListType* rules, SelectorChecker::ContextFlags contextFlags, CascadeScope cascadeScope, CascadeOrder cascadeOrder, const MatchRequest& matchRequest, RuleRange& ruleRange) 138 { 139 if (!rules) 140 return; 141 142 for (typename RuleDataListType::const_iterator it = rules->begin(), end = rules->end(); it != end; ++it) 143 collectRuleIfMatches(*it, contextFlags, cascadeScope, cascadeOrder, matchRequest, ruleRange); 144 } 145 146 bool ruleMatches(const RuleData&, const ContainerNode* scope, SelectorChecker::ContextFlags, SelectorChecker::MatchResult*); 147 148 CSSRuleList* nestedRuleList(CSSRule*); 149 template<class CSSRuleCollection> 150 CSSRule* findStyleRule(CSSRuleCollection*, StyleRule*); 151 void appendCSSOMWrapperForRule(CSSStyleSheet*, StyleRule*); 152 153 void sortMatchedRules(); 154 void addMatchedRule(const RuleData*, unsigned specificity, CascadeScope, CascadeOrder, unsigned styleSheetIndex, const CSSStyleSheet* parentStyleSheet); 155 156 StaticCSSRuleList* ensureRuleList(); 157 StyleRuleList* ensureStyleRuleList(); 158 159 private: 160 const ElementResolveContext& m_context; 161 const SelectorFilter& m_selectorFilter; 162 RefPtr<RenderStyle> m_style; // FIXME: This can be mutated during matching! 163 164 PseudoStyleRequest m_pseudoStyleRequest; 165 SelectorChecker::Mode m_mode; 166 bool m_canUseFastReject; 167 bool m_sameOriginOnly; 168 bool m_matchingUARules; 169 170 OwnPtrWillBeMember<WillBeHeapVector<MatchedRule, 32> > m_matchedRules; 171 172 // Output. 173 RefPtrWillBeMember<StaticCSSRuleList> m_cssRuleList; 174 RefPtrWillBeMember<StyleRuleList> m_styleRuleList; 175 MatchResult m_result; 176 }; 177 178 } // namespace blink 179 180 #endif // ElementRuleCollector_h 181
