1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Copyright (C) 2016 Apple Inc. All rights reserved.
3//
4// Redistribution and use in source and binary forms, with or without
5// modification, are permitted provided that the following conditions are
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7//
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9// notice, this list of conditions and the following disclaimer.
10// * Redistributions in binary form must reproduce the above
11// copyright notice, this list of conditions and the following disclaimer
12// in the documentation and/or other materials provided with the
13// distribution.
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15// contributors may be used to endorse or promote products derived from
16// this software without specific prior written permission.
17//
18// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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28// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29
30#pragma once
31
32#include "CSSParserToken.h"
33#include "CSSParserTokenRange.h"
34#include "MediaQuery.h"
35#include "MediaQueryBlockWatcher.h"
36#include "MediaQueryExpression.h"
37#include "MediaQueryParserContext.h"
38#include <wtf/Optional.h>
39#include <wtf/text/WTFString.h>
40
41namespace WebCore {
42
43class MediaQuerySet;
44struct CSSParserContext;
45
46class MediaQueryParser {
47 WTF_MAKE_NONCOPYABLE(MediaQueryParser);
48public:
49 static RefPtr<MediaQuerySet> parseMediaQuerySet(const String&, MediaQueryParserContext);
50 static RefPtr<MediaQuerySet> parseMediaQuerySet(CSSParserTokenRange, MediaQueryParserContext);
51 static RefPtr<MediaQuerySet> parseMediaCondition(CSSParserTokenRange, MediaQueryParserContext);
52
53private:
54 enum ParserType {
55 MediaQuerySetParser,
56 MediaConditionParser,
57 };
58
59 MediaQueryParser(ParserType, MediaQueryParserContext);
60 virtual ~MediaQueryParser();
61
62 RefPtr<MediaQuerySet> parseInternal(CSSParserTokenRange);
63
64 void processToken(const CSSParserToken&, CSSParserTokenRange&);
65
66 void readRestrictor(CSSParserTokenType, const CSSParserToken&, CSSParserTokenRange&);
67 void readMediaNot(CSSParserTokenType, const CSSParserToken&, CSSParserTokenRange&);
68 void readMediaType(CSSParserTokenType, const CSSParserToken&, CSSParserTokenRange&);
69 void readAnd(CSSParserTokenType, const CSSParserToken&, CSSParserTokenRange&);
70 void readFeatureStart(CSSParserTokenType, const CSSParserToken&, CSSParserTokenRange&);
71 void readFeature(CSSParserTokenType, const CSSParserToken&, CSSParserTokenRange&);
72 void readFeatureColon(CSSParserTokenType, const CSSParserToken&, CSSParserTokenRange&);
73 void readFeatureValue(CSSParserTokenType, const CSSParserToken&, CSSParserTokenRange&);
74 void readFeatureEnd(CSSParserTokenType, const CSSParserToken&, CSSParserTokenRange&);
75 void skipUntilComma(CSSParserTokenType, const CSSParserToken&, CSSParserTokenRange&);
76 void skipUntilBlockEnd(CSSParserTokenType, const CSSParserToken&, CSSParserTokenRange&);
77 void done(CSSParserTokenType, const CSSParserToken&, CSSParserTokenRange&);
78
79 using State = void (MediaQueryParser::*)(CSSParserTokenType, const CSSParserToken&, CSSParserTokenRange&);
80
81 void setStateAndRestrict(State, MediaQuery::Restrictor);
82 void handleBlocks(const CSSParserToken&);
83
84 void commitMediaQuery();
85
86 class MediaQueryData {
87 WTF_MAKE_NONCOPYABLE(MediaQueryData);
88 public:
89 explicit MediaQueryData(MediaQueryParserContext);
90 void clear();
91 void addExpression(CSSParserTokenRange&);
92 bool lastExpressionValid();
93 void removeLastExpression();
94 void setMediaType(const String& mediaType) { m_mediaType = mediaType; }
95
96 MediaQuery::Restrictor restrictor() const { return m_restrictor; }
97 Vector<MediaQueryExpression>& expressions() { return m_expressions; }
98 const Optional<String>& mediaType() const { return m_mediaType; }
99
100 bool currentMediaQueryChanged() const
101 {
102 return (m_restrictor != MediaQuery::None || m_mediaType || !m_expressions.isEmpty());
103 }
104 MediaQuery::Restrictor restrictor() { return m_restrictor; }
105
106 void setRestrictor(MediaQuery::Restrictor restrictor) { m_restrictor = restrictor; }
107
108 void setMediaFeature(const String& str) { m_mediaFeature = str; }
109
110 void setMediaQueryParserContext(MediaQueryParserContext context) { m_context = context; }
111
112 private:
113 MediaQuery::Restrictor m_restrictor { MediaQuery::None };
114 Optional<String> m_mediaType;
115 Vector<MediaQueryExpression> m_expressions;
116 String m_mediaFeature;
117 MediaQueryParserContext m_context;
118 };
119
120 State m_state;
121 ParserType m_parserType;
122 MediaQueryData m_mediaQueryData;
123 RefPtr<MediaQuerySet> m_querySet;
124 MediaQueryBlockWatcher m_blockWatcher;
125
126 const static State ReadRestrictor;
127 const static State ReadMediaNot;
128 const static State ReadMediaType;
129 const static State ReadAnd;
130 const static State ReadFeatureStart;
131 const static State ReadFeature;
132 const static State ReadFeatureColon;
133 const static State ReadFeatureValue;
134 const static State ReadFeatureEnd;
135 const static State SkipUntilComma;
136 const static State SkipUntilBlockEnd;
137 const static State Done;
138};
139
140} // namespace WebCore
141