1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Copyright (C) 2016 Apple Inc. All rights reserved.
3//
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29
30#pragma once
31
32#include "CSSParserSelector.h"
33#include "CSSParserTokenRange.h"
34#include <memory>
35
36namespace WebCore {
37
38struct CSSParserContext;
39class CSSSelectorList;
40class StyleSheetContents;
41
42// FIXME: We should consider building CSSSelectors directly instead of using
43// the intermediate CSSParserSelector.
44class CSSSelectorParser {
45public:
46 static CSSSelectorList parseSelector(CSSParserTokenRange, const CSSParserContext&, StyleSheetContents*);
47
48 static bool consumeANPlusB(CSSParserTokenRange&, std::pair<int, int>&);
49
50private:
51 CSSSelectorParser(const CSSParserContext&, StyleSheetContents*);
52
53 // These will all consume trailing comments if successful
54
55 CSSSelectorList consumeComplexSelectorList(CSSParserTokenRange&);
56 CSSSelectorList consumeCompoundSelectorList(CSSParserTokenRange&);
57
58 std::unique_ptr<CSSParserSelector> consumeComplexSelector(CSSParserTokenRange&);
59 std::unique_ptr<CSSParserSelector> consumeCompoundSelector(CSSParserTokenRange&);
60 // This doesn't include element names, since they're handled specially
61 std::unique_ptr<CSSParserSelector> consumeSimpleSelector(CSSParserTokenRange&);
62
63 bool consumeName(CSSParserTokenRange&, AtomicString& name, AtomicString& namespacePrefix);
64
65 // These will return nullptr when the selector is invalid
66 std::unique_ptr<CSSParserSelector> consumeId(CSSParserTokenRange&);
67 std::unique_ptr<CSSParserSelector> consumeClass(CSSParserTokenRange&);
68 std::unique_ptr<CSSParserSelector> consumePseudo(CSSParserTokenRange&);
69 std::unique_ptr<CSSParserSelector> consumeAttribute(CSSParserTokenRange&);
70
71 CSSSelector::RelationType consumeCombinator(CSSParserTokenRange&);
72 CSSSelector::Match consumeAttributeMatch(CSSParserTokenRange&);
73 CSSSelector::AttributeMatchType consumeAttributeFlags(CSSParserTokenRange&);
74
75 const AtomicString& defaultNamespace() const;
76 const AtomicString& determineNamespace(const AtomicString& prefix);
77 void prependTypeSelectorIfNeeded(const AtomicString& namespacePrefix, const AtomicString& elementName, CSSParserSelector*);
78 static std::unique_ptr<CSSParserSelector> addSimpleSelectorToCompound(std::unique_ptr<CSSParserSelector> compoundSelector, std::unique_ptr<CSSParserSelector> simpleSelector);
79 static std::unique_ptr<CSSParserSelector> splitCompoundAtImplicitShadowCrossingCombinator(std::unique_ptr<CSSParserSelector> compoundSelector, const CSSParserContext&);
80
81 const CSSParserContext& m_context;
82 RefPtr<StyleSheetContents> m_styleSheet; // FIXME: Should be const
83
84 bool m_failedParsing = false;
85 bool m_disallowPseudoElements = false;
86
87 class DisallowPseudoElementsScope {
88 WTF_MAKE_NONCOPYABLE(DisallowPseudoElementsScope);
89 public:
90 DisallowPseudoElementsScope(CSSSelectorParser* parser)
91 : m_parser(parser), m_wasDisallowed(m_parser->m_disallowPseudoElements)
92 {
93 m_parser->m_disallowPseudoElements = true;
94 }
95
96 ~DisallowPseudoElementsScope()
97 {
98 m_parser->m_disallowPseudoElements = m_wasDisallowed;
99 }
100
101 private:
102 CSSSelectorParser* m_parser;
103 bool m_wasDisallowed;
104 };
105};
106
107} // namespace WebCore
108
109