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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "config.h" |
| 6 #include "core/css/parser/MediaQueryParser.h" |
| 7 |
| 8 #include "core/css/parser/BisonCSSParser.h" |
| 9 #include "core/css/parser/MediaQueryTokenizer.h" |
| 10 |
| 11 namespace WebCore { |
| 12 |
| 13 PassRefPtrWillBeRawPtr<MediaQuerySet> MediaQueryParser::parse(String queryString
) |
| 14 { |
| 15 MediaQueryParser parser(queryString); |
| 16 return parser.parseImpl(); |
| 17 } |
| 18 |
| 19 MediaQueryParser::MediaQueryParser(String queryString) |
| 20 : m_state(&MediaQueryParser::readRestrictor) |
| 21 { |
| 22 MediaQueryTokenizer::tokenize(queryString, m_tokens); |
| 23 } |
| 24 |
| 25 // State machine member functions start here |
| 26 void MediaQueryParser::readRestrictor(CSSTokenType type, TokenIterator& token) |
| 27 { |
| 28 readMediaType(type, token); |
| 29 } |
| 30 |
| 31 void MediaQueryParser::readMediaType(CSSTokenType type, TokenIterator& token) |
| 32 { |
| 33 if (type == LeftParenToken) { |
| 34 m_state = &MediaQueryParser::readFeature; |
| 35 } else if (type == IdentToken) { |
| 36 if (m_state == &MediaQueryParser::readRestrictor && token->value().lower
() == "not") { |
| 37 m_mediaQueryData.setRestrictor(MediaQuery::Not); |
| 38 m_state = &MediaQueryParser::readMediaType; |
| 39 } else if (m_state == &MediaQueryParser::readRestrictor && token->value(
).lower() == "only") { |
| 40 m_mediaQueryData.setRestrictor(MediaQuery::Only); |
| 41 m_state = &MediaQueryParser::readMediaType; |
| 42 } else { |
| 43 m_mediaQueryData.setMediaType(token->value()); |
| 44 m_state = &MediaQueryParser::readAnd; |
| 45 } |
| 46 } else if (type == EOFToken && (!m_mediaQueryData.querySetSize() || m_state
!= &MediaQueryParser::readRestrictor)) { |
| 47 m_state = &MediaQueryParser::done; |
| 48 } else { |
| 49 if (type == CommaToken) |
| 50 --token; |
| 51 m_state = &MediaQueryParser::skipTillComma; |
| 52 } |
| 53 } |
| 54 |
| 55 void MediaQueryParser::readAnd(CSSTokenType type, TokenIterator& token) |
| 56 { |
| 57 if (type == IdentToken && token->value().lower() == "and") { |
| 58 m_state = &MediaQueryParser::readFeatureStart; |
| 59 } else if (type == CommaToken) { |
| 60 m_mediaQueryData.addCurrentMediaQuery(); |
| 61 m_state = &MediaQueryParser::readRestrictor; |
| 62 } else if (type == EOFToken) { |
| 63 m_state = &MediaQueryParser::done; |
| 64 } else { |
| 65 m_state = &MediaQueryParser::skipTillComma; |
| 66 } |
| 67 } |
| 68 |
| 69 void MediaQueryParser::readFeatureStart(CSSTokenType type, TokenIterator& token) |
| 70 { |
| 71 if (type == LeftParenToken) |
| 72 m_state = &MediaQueryParser::readFeature; |
| 73 else |
| 74 m_state = &MediaQueryParser::skipTillComma; |
| 75 } |
| 76 |
| 77 void MediaQueryParser::readFeature(CSSTokenType type, TokenIterator& token) |
| 78 { |
| 79 if (type == IdentToken) { |
| 80 m_mediaQueryData.setMediaFeature(token->value()); |
| 81 m_state = &MediaQueryParser::readFeatureColon; |
| 82 } else { |
| 83 m_state = &MediaQueryParser::skipTillComma; |
| 84 } |
| 85 } |
| 86 |
| 87 void MediaQueryParser::readFeatureColon(CSSTokenType type, TokenIterator& token) |
| 88 { |
| 89 if (type == ColonToken) { |
| 90 m_state = &MediaQueryParser::readFeatureValue; |
| 91 } else if (type == RightParenToken || type == EOFToken) { |
| 92 --token; |
| 93 m_state = &MediaQueryParser::readFeatureEnd; |
| 94 } else { |
| 95 m_state = &MediaQueryParser::skipTillParen; |
| 96 } |
| 97 } |
| 98 |
| 99 void MediaQueryParser::readFeatureValue(CSSTokenType type, TokenIterator& token) |
| 100 { |
| 101 if (type == DimensionToken && token->unitType() == CSSPrimitiveValue::CSS_UN
KNOWN) { |
| 102 m_state = &MediaQueryParser::skipTillComma; |
| 103 } else { |
| 104 m_mediaQueryData.addParserValue(type, token); |
| 105 m_state = &MediaQueryParser::readFeatureEnd; |
| 106 } |
| 107 } |
| 108 |
| 109 void MediaQueryParser::readFeatureEnd(CSSTokenType type, TokenIterator& token) |
| 110 { |
| 111 if (type == RightParenToken || type == EOFToken) { |
| 112 if (m_mediaQueryData.addExpression()) |
| 113 m_state = &MediaQueryParser::readAnd; |
| 114 else |
| 115 m_state = &MediaQueryParser::skipTillComma; |
| 116 } else if (type == DelimToken && token->delimiter() == '/') { |
| 117 m_mediaQueryData.addParserValue(type, token); |
| 118 m_state = &MediaQueryParser::readFeatureValue; |
| 119 } else { |
| 120 m_state = &MediaQueryParser::skipTillParen; |
| 121 } |
| 122 } |
| 123 |
| 124 void MediaQueryParser::skipTillComma(CSSTokenType type, TokenIterator& token) |
| 125 { |
| 126 if (type == CommaToken || type == EOFToken) { |
| 127 m_state = &MediaQueryParser::readRestrictor; |
| 128 m_mediaQueryData.resetCurrentQuery(); |
| 129 m_mediaQueryData.addNotAllMediaQuery(); |
| 130 } |
| 131 } |
| 132 |
| 133 void MediaQueryParser::skipTillParen(CSSTokenType type, TokenIterator& token) |
| 134 { |
| 135 if (type == RightParenToken) |
| 136 m_state = &MediaQueryParser::skipTillComma; |
| 137 } |
| 138 |
| 139 void MediaQueryParser::done(CSSTokenType type, TokenIterator& token) { } |
| 140 |
| 141 // The state machine loop |
| 142 PassRefPtrWillBeRawPtr<MediaQuerySet> MediaQueryParser::parseImpl() |
| 143 { |
| 144 CSSTokenType type; |
| 145 |
| 146 for (Vector<CSSToken>::iterator token = m_tokens.begin(); token != m_tokens.
end(); ++token) { |
| 147 type = token->type(); |
| 148 if (type == WhitespaceToken) |
| 149 continue; |
| 150 |
| 151 // Call the function that handles current state |
| 152 ((this)->*(m_state))(type, token); |
| 153 } |
| 154 |
| 155 if (m_state != &MediaQueryParser::readAnd && m_state != &MediaQueryParser::r
eadRestrictor && m_state != &MediaQueryParser::done) |
| 156 m_mediaQueryData.addNotAllMediaQuery(); |
| 157 else if (m_mediaQueryData.currentMediaQueryChanged()) |
| 158 m_mediaQueryData.addCurrentMediaQuery(); |
| 159 |
| 160 return m_mediaQueryData.querySet(); |
| 161 } |
| 162 |
| 163 MediaQueryData::MediaQueryData() |
| 164 : m_querySet(MediaQuerySet::create()) |
| 165 , m_restrictor(MediaQuery::None) |
| 166 , m_mediaType("all") |
| 167 , m_expressions(adoptPtr(new ExpressionVector())) |
| 168 , m_mediaTypeSet(false) |
| 169 { |
| 170 } |
| 171 |
| 172 void MediaQueryData::resetCurrentQuery() |
| 173 { |
| 174 m_mediaType = "all"; |
| 175 m_mediaTypeSet = false; |
| 176 m_mediaFeature = ""; |
| 177 m_restrictor = MediaQuery::None; |
| 178 m_valueList.clear(); |
| 179 m_expressions = adoptPtr(new ExpressionVector()); |
| 180 } |
| 181 |
| 182 void MediaQueryData::addCurrentMediaQuery() |
| 183 { |
| 184 m_querySet->addMediaQuery(adoptPtr(new MediaQuery(m_restrictor, m_mediaType,
m_expressions.release()))); |
| 185 resetCurrentQuery(); |
| 186 } |
| 187 |
| 188 bool MediaQueryData::addExpression() |
| 189 { |
| 190 OwnPtr<MediaQueryExp> expression = MediaQueryExp::create(m_mediaFeature, &(m
_valueList)); |
| 191 bool retValue = (expression.get()); |
| 192 m_expressions->append(expression.release()); |
| 193 m_valueList.clear(); |
| 194 return retValue; |
| 195 } |
| 196 |
| 197 void MediaQueryData::addParserValue(CSSTokenType type, CSSToken* token) |
| 198 { |
| 199 CSSParserValue value; |
| 200 if (type == NumberToken || type == PercentageToken || type == DimensionToken
) { |
| 201 value.setFromNumber(token->numericValue(), token->unitType()); |
| 202 value.isInt = (token->numericValueType() == IntegerValueType); |
| 203 } else if (type == DelimToken) { |
| 204 value.unit = CSSParserValue::Operator; |
| 205 value.iValue = token->delimiter(); |
| 206 } else { |
| 207 CSSParserFunction* function = new CSSParserFunction; |
| 208 function->name.init(token->value()); |
| 209 value.setFromFunction(function); |
| 210 CSSParserString tokenValue; |
| 211 tokenValue.init(token->value()); |
| 212 value.id = cssValueKeywordID(tokenValue); |
| 213 } |
| 214 m_valueList.addValue(value); |
| 215 } |
| 216 |
| 217 void MediaQueryData::setMediaType(const String& mediaType) |
| 218 { |
| 219 m_mediaType = mediaType; |
| 220 m_mediaTypeSet = true; |
| 221 } |
| 222 |
| 223 } // namespace WebCore |
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