1 /* 2 * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org) 3 * (C) 2004-2005 Allan Sandfeld Jensen (kde (at) carewolf.com) 4 * Copyright (C) 2006, 2007 Nicholas Shanks (webkit (at) nickshanks.com) 5 * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved. 6 * Copyright (C) 2007 Alexey Proskuryakov <ap (at) webkit.org> 7 * Copyright (C) 2007, 2008 Eric Seidel <eric (at) webkit.org> 8 * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/) 9 * Copyright (c) 2011, Code Aurora Forum. All rights reserved. 10 * Copyright (C) Research In Motion Limited 2011. All rights reserved. 11 * 12 * This library is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU Library General Public 14 * License as published by the Free Software Foundation; either 15 * version 2 of the License, or (at your option) any later version. 16 * 17 * This library is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 20 * Library General Public License for more details. 21 * 22 * You should have received a copy of the GNU Library General Public License 23 * along with this library; see the file COPYING.LIB. If not, write to 24 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 25 * Boston, MA 02110-1301, USA. 26 */ 27 28 #ifndef SelectorChecker_h 29 #define SelectorChecker_h 30 31 #include "core/css/CSSSelector.h" 32 #include "core/dom/Element.h" 33 #include "platform/scroll/ScrollTypes.h" 34 35 namespace WebCore { 36 37 class CSSSelector; 38 class ContainerNode; 39 class Element; 40 class RenderScrollbar; 41 class RenderStyle; 42 43 class SelectorChecker { 44 WTF_MAKE_NONCOPYABLE(SelectorChecker); 45 public: 46 enum Match { SelectorMatches, SelectorFailsLocally, SelectorFailsAllSiblings, SelectorFailsCompletely }; 47 enum VisitedMatchType { VisitedMatchDisabled, VisitedMatchEnabled }; 48 enum Mode { ResolvingStyle = 0, CollectingStyleRules, CollectingCSSRules, QueryingRules, SharingRules }; 49 explicit SelectorChecker(Document&, Mode); 50 enum BehaviorAtBoundary { 51 DoesNotCrossBoundary = 0, 52 // FIXME: refactor to remove BoundaryBehavior (i.e. DoesNotCrossBoundary and StaysWithinTreeScope). 53 StaysWithinTreeScope = 2, 54 BoundaryBehaviorMask = 3, // 2bit for boundary behavior 55 ScopeContainsLastMatchedElement = 4, 56 ScopeIsShadowRoot = 8, 57 TreatShadowHostAsNormalScope = 16, 58 59 ScopeIsShadowHostInPseudoHostParameter = ScopeIsShadowRoot | TreatShadowHostAsNormalScope 60 }; 61 62 struct SelectorCheckingContext { 63 // Initial selector constructor 64 SelectorCheckingContext(const CSSSelector& selector, Element* element, VisitedMatchType visitedMatchType) 65 : selector(&selector) 66 , element(element) 67 , previousElement(0) 68 , scope(0) 69 , visitedMatchType(visitedMatchType) 70 , pseudoId(NOPSEUDO) 71 , elementStyle(0) 72 , scrollbar(0) 73 , scrollbarPart(NoPart) 74 , isSubSelector(false) 75 , hasScrollbarPseudo(false) 76 , hasSelectionPseudo(false) 77 , behaviorAtBoundary(DoesNotCrossBoundary) 78 { } 79 80 const CSSSelector* selector; 81 Element* element; 82 Element* previousElement; 83 const ContainerNode* scope; 84 VisitedMatchType visitedMatchType; 85 PseudoId pseudoId; 86 RenderStyle* elementStyle; 87 RenderScrollbar* scrollbar; 88 ScrollbarPart scrollbarPart; 89 bool isSubSelector; 90 bool hasScrollbarPseudo; 91 bool hasSelectionPseudo; 92 BehaviorAtBoundary behaviorAtBoundary; 93 }; 94 95 struct MatchResult { 96 MatchResult() 97 : dynamicPseudo(NOPSEUDO) 98 , specificity(0) { } 99 100 PseudoId dynamicPseudo; 101 unsigned specificity; 102 }; 103 104 template<typename SiblingTraversalStrategy> 105 Match match(const SelectorCheckingContext&, const SiblingTraversalStrategy&, MatchResult* = 0) const; 106 107 template<typename SiblingTraversalStrategy> 108 bool checkOne(const SelectorCheckingContext&, const SiblingTraversalStrategy&, unsigned* specificity = 0) const; 109 110 bool strictParsing() const { return m_strictParsing; } 111 112 Mode mode() const { return m_mode; } 113 114 static bool tagMatches(const Element&, const QualifiedName&); 115 static bool isCommonPseudoClassSelector(const CSSSelector&); 116 static bool matchesFocusPseudoClass(const Element&); 117 static bool checkExactAttribute(const Element&, const QualifiedName& selectorAttributeName, const StringImpl* value); 118 119 enum LinkMatchMask { MatchLink = 1, MatchVisited = 2, MatchAll = MatchLink | MatchVisited }; 120 static unsigned determineLinkMatchType(const CSSSelector&); 121 122 static bool isHostInItsShadowTree(const Element&, BehaviorAtBoundary, const ContainerNode* scope); 123 124 private: 125 template<typename SiblingTraversalStrategy> 126 Match matchForSubSelector(const SelectorCheckingContext&, const SiblingTraversalStrategy&, MatchResult*) const; 127 template<typename SiblingTraversalStrategy> 128 Match matchForRelation(const SelectorCheckingContext&, const SiblingTraversalStrategy&, MatchResult*) const; 129 template<typename SiblingTraversalStrategy> 130 Match matchForShadowDistributed(const Element*, const SiblingTraversalStrategy&, SelectorCheckingContext& nextContext, MatchResult* = 0) const; 131 template<typename SiblingTraversalStrategy> 132 Match matchForPseudoShadow(const ContainerNode*, const SelectorCheckingContext&, const SiblingTraversalStrategy&, MatchResult*) const; 133 134 bool checkScrollbarPseudoClass(const SelectorCheckingContext&, Document*, const CSSSelector&) const; 135 Element* parentElement(const SelectorCheckingContext&, bool allowToCrossBoundary = false) const; 136 bool scopeContainsLastMatchedElement(const SelectorCheckingContext&) const; 137 138 static bool isFrameFocused(const Element&); 139 140 bool m_strictParsing; 141 bool m_documentIsHTML; 142 Mode m_mode; 143 }; 144 145 inline bool SelectorChecker::isCommonPseudoClassSelector(const CSSSelector& selector) 146 { 147 if (selector.match() != CSSSelector::PseudoClass) 148 return false; 149 CSSSelector::PseudoType pseudoType = selector.pseudoType(); 150 return pseudoType == CSSSelector::PseudoLink 151 || pseudoType == CSSSelector::PseudoAnyLink 152 || pseudoType == CSSSelector::PseudoVisited 153 || pseudoType == CSSSelector::PseudoFocus; 154 } 155 156 inline bool SelectorChecker::tagMatches(const Element& element, const QualifiedName& tagQName) 157 { 158 if (tagQName == anyQName()) 159 return true; 160 const AtomicString& localName = tagQName.localName(); 161 if (localName != starAtom && localName != element.localName()) 162 return false; 163 const AtomicString& namespaceURI = tagQName.namespaceURI(); 164 return namespaceURI == starAtom || namespaceURI == element.namespaceURI(); 165 } 166 167 inline bool SelectorChecker::checkExactAttribute(const Element& element, const QualifiedName& selectorAttributeName, const StringImpl* value) 168 { 169 if (!element.hasAttributesWithoutUpdate()) 170 return false; 171 AttributeCollection attributes = element.attributes(); 172 AttributeCollection::const_iterator end = attributes.end(); 173 for (AttributeCollection::const_iterator it = attributes.begin(); it != end; ++it) { 174 if (it->matches(selectorAttributeName) && (!value || it->value().impl() == value)) 175 return true; 176 } 177 return false; 178 } 179 180 inline bool SelectorChecker::isHostInItsShadowTree(const Element& element, BehaviorAtBoundary behaviorAtBoundary, const ContainerNode* scope) 181 { 182 return scope && scope->isInShadowTree() && scope->shadowHost() == element; 183 } 184 185 } 186 187 #endif 188