1/*
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.
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/inspector/InspectorInstrumentation.h"
33
34namespace WebCore {
35
36class CSSSelector;
37class Element;
38class RenderScrollbar;
39class RenderStyle;
40
41class SelectorChecker {
42    WTF_MAKE_NONCOPYABLE(SelectorChecker);
43public:
44    enum Match { SelectorMatches, SelectorFailsLocally, SelectorFailsAllSiblings, SelectorFailsCompletely };
45    enum VisitedMatchType { VisitedMatchDisabled, VisitedMatchEnabled };
46    enum Mode { ResolvingStyle = 0, CollectingRules, QueryingRules, SharingRules };
47    explicit SelectorChecker(Document*, Mode);
48    enum BehaviorAtBoundary {
49        DoesNotCrossBoundary = 0,
50        CrossesBoundary = 1,
51        StaysWithinTreeScope = 2,
52        BoundaryBehaviorMask = 3, // 2bit for boundary behavior
53        ScopeContainsLastMatchedElement = 4,
54        ScopeIsShadowHost = 8
55    };
56
57    struct SelectorCheckingContext {
58        // Initial selector constructor
59        SelectorCheckingContext(const CSSSelector* selector, Element* element, VisitedMatchType visitedMatchType)
60            : selector(selector)
61            , element(element)
62            , scope(0)
63            , visitedMatchType(visitedMatchType)
64            , pseudoId(NOPSEUDO)
65            , elementStyle(0)
66            , scrollbar(0)
67            , scrollbarPart(NoPart)
68            , isSubSelector(false)
69            , hasScrollbarPseudo(false)
70            , hasSelectionPseudo(false)
71            , behaviorAtBoundary(DoesNotCrossBoundary)
72        { }
73
74        const CSSSelector* selector;
75        Element* element;
76        const ContainerNode* scope;
77        VisitedMatchType visitedMatchType;
78        PseudoId pseudoId;
79        RenderStyle* elementStyle;
80        RenderScrollbar* scrollbar;
81        ScrollbarPart scrollbarPart;
82        bool isSubSelector;
83        bool hasScrollbarPseudo;
84        bool hasSelectionPseudo;
85        BehaviorAtBoundary behaviorAtBoundary;
86    };
87
88    template<typename SiblingTraversalStrategy>
89    Match match(const SelectorCheckingContext&, PseudoId&, const SiblingTraversalStrategy&) const;
90
91    template<typename SiblingTraversalStrategy>
92    Match matchForShadowDistributed(const Element*, const SiblingTraversalStrategy&, PseudoId&, SelectorCheckingContext& nextContext) const;
93
94    template<typename SiblingTraversalStrategy>
95    bool checkOne(const SelectorCheckingContext&, const SiblingTraversalStrategy&) const;
96
97    bool strictParsing() const { return m_strictParsing; }
98
99    Mode mode() const { return m_mode; }
100
101    static bool tagMatches(const Element*, const QualifiedName&);
102    static bool isCommonPseudoClassSelector(const CSSSelector*);
103    static bool matchesFocusPseudoClass(const Element*);
104    static bool checkExactAttribute(const Element*, const QualifiedName& selectorAttributeName, const StringImpl* value);
105
106    enum LinkMatchMask { MatchLink = 1, MatchVisited = 2, MatchAll = MatchLink | MatchVisited };
107    static unsigned determineLinkMatchType(const CSSSelector*);
108
109private:
110    bool checkScrollbarPseudoClass(const SelectorCheckingContext&, Document*, const CSSSelector*) const;
111    Element* parentElement(const SelectorCheckingContext&) const;
112    bool scopeContainsLastMatchedElement(const SelectorCheckingContext&) const;
113
114    static bool isFrameFocused(const Element*);
115
116    bool m_strictParsing;
117    bool m_documentIsHTML;
118    Mode m_mode;
119};
120
121inline bool SelectorChecker::isCommonPseudoClassSelector(const CSSSelector* selector)
122{
123    if (selector->m_match != CSSSelector::PseudoClass)
124        return false;
125    CSSSelector::PseudoType pseudoType = selector->pseudoType();
126    return pseudoType == CSSSelector::PseudoLink
127        || pseudoType == CSSSelector::PseudoAnyLink
128        || pseudoType == CSSSelector::PseudoVisited
129        || pseudoType == CSSSelector::PseudoFocus;
130}
131
132inline bool SelectorChecker::tagMatches(const Element* element, const QualifiedName& tagQName)
133{
134    if (tagQName == anyQName())
135        return true;
136    const AtomicString& localName = tagQName.localName();
137    if (localName != starAtom && localName != element->localName())
138        return false;
139    const AtomicString& namespaceURI = tagQName.namespaceURI();
140    return namespaceURI == starAtom || namespaceURI == element->namespaceURI();
141}
142
143inline bool SelectorChecker::checkExactAttribute(const Element* element, const QualifiedName& selectorAttributeName, const StringImpl* value)
144{
145    if (!element->hasAttributesWithoutUpdate())
146        return false;
147    unsigned size = element->attributeCount();
148    for (unsigned i = 0; i < size; ++i) {
149        const Attribute* attribute = element->attributeItem(i);
150        if (attribute->matches(selectorAttributeName) && (!value || attribute->value().impl() == value))
151            return true;
152    }
153    return false;
154}
155
156}
157
158#endif
159