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) 2005-2016 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#pragma once
29
30#include "CSSSelector.h"
31#include "Element.h"
32#include "StyleRelations.h"
33
34namespace WebCore {
35
36class CSSSelector;
37class Element;
38class RenderScrollbar;
39class RenderStyle;
40
41class SelectorChecker {
42 WTF_MAKE_NONCOPYABLE(SelectorChecker);
43 enum class Match { SelectorMatches, SelectorFailsLocally, SelectorFailsAllSiblings, SelectorFailsCompletely };
44
45 enum class MatchType { VirtualPseudoElementOnly, Element };
46
47 struct MatchResult {
48 Match match;
49 MatchType matchType;
50
51 static MatchResult matches(MatchType matchType)
52 {
53 return { Match::SelectorMatches, matchType };
54 }
55
56 static MatchResult updateWithMatchType(MatchResult result, MatchType matchType)
57 {
58 if (matchType == MatchType::VirtualPseudoElementOnly)
59 result.matchType = MatchType::VirtualPseudoElementOnly;
60 return result;
61 }
62
63 static MatchResult fails(Match match)
64 {
65 return { match, MatchType::Element };
66 }
67 };
68
69public:
70 enum class Mode : unsigned char {
71 ResolvingStyle = 0, CollectingRules, CollectingRulesIgnoringVirtualPseudoElements, QueryingRules
72 };
73
74 SelectorChecker(Document&);
75
76 struct CheckingContext {
77 CheckingContext(SelectorChecker::Mode resolvingMode)
78 : resolvingMode(resolvingMode)
79 { }
80
81 const SelectorChecker::Mode resolvingMode;
82 PseudoId pseudoId { PseudoId::None };
83 RenderScrollbar* scrollbar { nullptr };
84 ScrollbarPart scrollbarPart { NoPart };
85 const ContainerNode* scope { nullptr };
86 bool isMatchingHostPseudoClass { false };
87
88 // FIXME: It would be nicer to have a separate object for return values. This requires some more work in the selector compiler.
89 Style::Relations styleRelations;
90 PseudoIdSet pseudoIDSet;
91 };
92
93 bool match(const CSSSelector&, const Element&, CheckingContext&, unsigned& specificity) const;
94
95 bool matchHostPseudoClass(const CSSSelector&, const Element&, CheckingContext&, unsigned& specificity) const;
96
97 static bool isCommonPseudoClassSelector(const CSSSelector*);
98 static bool matchesFocusPseudoClass(const Element&);
99 static bool attributeSelectorMatches(const Element&, const QualifiedName&, const AtomicString& attributeValue, const CSSSelector&);
100
101 enum LinkMatchMask { MatchDefault = 0, MatchLink = 1, MatchVisited = 2, MatchAll = MatchLink | MatchVisited };
102 static unsigned determineLinkMatchType(const CSSSelector*);
103
104 struct LocalContext;
105
106private:
107 MatchResult matchRecursively(CheckingContext&, const LocalContext&, PseudoIdSet&, unsigned& specificity) const;
108 bool checkOne(CheckingContext&, const LocalContext&, PseudoIdSet&, MatchType&, unsigned& specificity) const;
109 bool matchSelectorList(CheckingContext&, const LocalContext&, const Element&, const CSSSelectorList&, unsigned& specificity) const;
110
111 bool checkScrollbarPseudoClass(const CheckingContext&, const Element&, const CSSSelector&) const;
112
113 bool m_strictParsing;
114 bool m_documentIsHTML;
115};
116
117inline bool SelectorChecker::isCommonPseudoClassSelector(const CSSSelector* selector)
118{
119 if (selector->match() != CSSSelector::PseudoClass)
120 return false;
121 CSSSelector::PseudoClassType pseudoType = selector->pseudoClassType();
122 return pseudoType == CSSSelector::PseudoClassLink
123 || pseudoType == CSSSelector::PseudoClassAnyLink
124 || pseudoType == CSSSelector::PseudoClassAnyLinkDeprecated
125 || pseudoType == CSSSelector::PseudoClassVisited
126 || pseudoType == CSSSelector::PseudoClassFocus;
127}
128
129} // namespace WebCore
130