2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 * (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
4 * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@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@webkit.org>
7 * Copyright (C) 2007, 2008 Eric Seidel <eric@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.
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.
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.
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.
28 #ifndef SelectorChecker_h
29 #define SelectorChecker_h
31 #include "core/css/CSSSelector.h"
32 #include "core/dom/Element.h"
33 #include "platform/scroll/ScrollTypes.h"
40 class RenderScrollbar;
43 class SelectorChecker {
44 WTF_MAKE_NONCOPYABLE(SelectorChecker);
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 ScopeIsShadowHost = 8,
57 TreatShadowHostAsNormalScope = 16,
59 ScopeIsShadowHostInPseudoHostParameter = ScopeIsShadowHost | TreatShadowHostAsNormalScope
62 struct SelectorCheckingContext {
63 // Initial selector constructor
64 SelectorCheckingContext(const CSSSelector& selector, Element* element, VisitedMatchType visitedMatchType)
69 , visitedMatchType(visitedMatchType)
73 , scrollbarPart(NoPart)
74 , isSubSelector(false)
75 , hasScrollbarPseudo(false)
76 , hasSelectionPseudo(false)
77 , behaviorAtBoundary(DoesNotCrossBoundary)
80 const CSSSelector* selector;
82 Element* previousElement;
83 const ContainerNode* scope;
84 VisitedMatchType visitedMatchType;
86 RenderStyle* elementStyle;
87 RenderScrollbar* scrollbar;
88 ScrollbarPart scrollbarPart;
90 bool hasScrollbarPseudo;
91 bool hasSelectionPseudo;
92 BehaviorAtBoundary behaviorAtBoundary;
97 : dynamicPseudo(NOPSEUDO)
100 PseudoId dynamicPseudo;
101 unsigned specificity;
104 template<typename SiblingTraversalStrategy>
105 Match match(const SelectorCheckingContext&, const SiblingTraversalStrategy&, MatchResult* = 0) const;
107 template<typename SiblingTraversalStrategy>
108 bool checkOne(const SelectorCheckingContext&, const SiblingTraversalStrategy&, unsigned* specificity = 0) const;
110 bool strictParsing() const { return m_strictParsing; }
112 Mode mode() const { return m_mode; }
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);
119 enum LinkMatchMask { MatchLink = 1, MatchVisited = 2, MatchAll = MatchLink | MatchVisited };
120 static unsigned determineLinkMatchType(const CSSSelector&);
122 static bool isHostInItsShadowTree(const Element&, BehaviorAtBoundary, const ContainerNode* scope);
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;
134 bool checkScrollbarPseudoClass(const SelectorCheckingContext&, Document*, const CSSSelector&) const;
135 Element* parentElement(const SelectorCheckingContext&, bool allowToCrossBoundary = false) const;
136 bool scopeContainsLastMatchedElement(const SelectorCheckingContext&) const;
138 static bool isFrameFocused(const Element&);
140 bool m_strictParsing;
141 bool m_documentIsHTML;
145 inline bool SelectorChecker::isCommonPseudoClassSelector(const CSSSelector& selector)
147 if (selector.m_match != CSSSelector::PseudoClass)
149 CSSSelector::PseudoType pseudoType = selector.pseudoType();
150 return pseudoType == CSSSelector::PseudoLink
151 || pseudoType == CSSSelector::PseudoAnyLink
152 || pseudoType == CSSSelector::PseudoVisited
153 || pseudoType == CSSSelector::PseudoFocus;
156 inline bool SelectorChecker::tagMatches(const Element& element, const QualifiedName& tagQName)
158 if (tagQName == anyQName())
160 const AtomicString& localName = tagQName.localName();
161 if (localName != starAtom && localName != element.localName())
163 const AtomicString& namespaceURI = tagQName.namespaceURI();
164 return namespaceURI == starAtom || namespaceURI == element.namespaceURI();
167 inline bool SelectorChecker::checkExactAttribute(const Element& element, const QualifiedName& selectorAttributeName, const StringImpl* value)
169 if (!element.hasAttributesWithoutUpdate())
171 unsigned size = element.attributeCount();
172 for (unsigned i = 0; i < size; ++i) {
173 const Attribute& attribute = element.attributeItem(i);
174 if (attribute.matches(selectorAttributeName) && (!value || attribute.value().impl() == value))
180 inline bool SelectorChecker::isHostInItsShadowTree(const Element& element, BehaviorAtBoundary behaviorAtBoundary, const ContainerNode* scope)
182 if ((behaviorAtBoundary & (ScopeIsShadowHost | TreatShadowHostAsNormalScope)) == ScopeIsShadowHost)
183 return scope == element;
184 if (scope && scope->isInShadowTree())
185 return scope->shadowHost() == element;