Add modern API for overriding the page's specified viewport configuration
[WebKit-https.git] / Source / WebCore / css / RuleFeature.h
1 /*
2  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3  * Copyright (C) 2003-2011, 2014 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 #pragma once
23
24 #include "CSSSelector.h"
25 #include <wtf/Forward.h>
26 #include <wtf/HashMap.h>
27 #include <wtf/HashSet.h>
28 #include <wtf/text/AtomicString.h>
29 #include <wtf/text/AtomicStringHash.h>
30
31 namespace WebCore {
32
33 class RuleData;
34 class StyleRule;
35
36 enum class MatchElement { Subject, Parent, Ancestor, DirectSibling, IndirectSibling, AnySibling, ParentSibling, AncestorSibling, Host };
37 constexpr unsigned matchElementCount = static_cast<unsigned>(MatchElement::Host) + 1;
38
39 struct RuleFeature {
40     RuleFeature(StyleRule* rule, unsigned selectorIndex, unsigned selectorListIndex, Optional<MatchElement> matchElement = WTF::nullopt, const CSSSelector* invalidationSelector = nullptr)
41         : rule(rule)
42         , selectorIndex(selectorIndex)
43         , selectorListIndex(selectorListIndex)
44         , matchElement(matchElement)
45         , invalidationSelector(invalidationSelector)
46     {
47     }
48     StyleRule* rule;
49     unsigned selectorIndex;
50     unsigned selectorListIndex;
51     Optional<MatchElement> matchElement;
52     const CSSSelector* invalidationSelector;
53 };
54
55 struct RuleFeatureSet {
56     void add(const RuleFeatureSet&);
57     void clear();
58     void shrinkToFit();
59     void collectFeatures(const RuleData&);
60     void registerContentAttribute(const AtomicString&);
61
62     HashSet<AtomicString> idsInRules;
63     HashSet<AtomicString> idsMatchingAncestorsInRules;
64     HashSet<AtomicString> attributeCanonicalLocalNamesInRules;
65     HashSet<AtomicString> attributeLocalNamesInRules;
66     HashSet<AtomicString> contentAttributeNamesInRules;
67     Vector<RuleFeature> siblingRules;
68     Vector<RuleFeature> uncommonAttributeRules;
69     
70     HashMap<AtomicString, std::unique_ptr<Vector<RuleFeature>>> classRules;
71     HashMap<AtomicString, std::unique_ptr<Vector<RuleFeature>>> attributeRules;
72     HashSet<AtomicString> classesAffectingHost;
73     HashSet<AtomicString> attributesAffectingHost;
74
75     bool usesFirstLineRules { false };
76     bool usesFirstLetterRules { false };
77
78 private:
79     static MatchElement computeNextMatchElement(MatchElement, CSSSelector::RelationType);
80     static MatchElement computeSubSelectorMatchElement(MatchElement, const CSSSelector&);
81
82     struct SelectorFeatures {
83         bool hasSiblingSelector { false };
84
85         Vector<std::pair<AtomicString, MatchElement>, 32> classes;
86         Vector<std::pair<const CSSSelector*, MatchElement>, 32> attributes;
87     };
88     void recursivelyCollectFeaturesFromSelector(SelectorFeatures&, const CSSSelector&, MatchElement = MatchElement::Subject);
89 };
90
91 } // namespace WebCore