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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/SizesAttributeParser.h" | |
| 7 | |
| 8 #include "core/MediaTypeNames.h" | |
| 9 #include "core/css/MediaQueryEvaluator.h" | |
| 10 #include "core/css/parser/MediaQueryTokenizer.h" | |
| 11 #include "core/css/parser/SizesCalcParser.h" | |
| 12 | |
| 13 namespace blink { | |
| 14 | |
| 15 SizesAttributeParser::SizesAttributeParser(PassRefPtr<MediaValues> mediaValues,
const String& attribute) | |
| 16 : m_mediaValues(mediaValues) | |
| 17 , m_length(0) | |
| 18 , m_lengthWasSet(false) | |
| 19 , m_viewportDependant(false) | |
| 20 { | |
| 21 MediaQueryTokenizer::tokenize(attribute, m_tokens); | |
| 22 m_isValid = parse(m_tokens); | |
| 23 } | |
| 24 | |
| 25 unsigned SizesAttributeParser::length() | |
| 26 { | |
| 27 if (m_isValid) | |
| 28 return effectiveSize(); | |
| 29 return effectiveSizeDefaultValue(); | |
| 30 } | |
| 31 | |
| 32 bool SizesAttributeParser::calculateLengthInPixels(MediaQueryTokenIterator start
Token, MediaQueryTokenIterator endToken, unsigned& result) | |
| 33 { | |
| 34 if (startToken == endToken) | |
| 35 return false; | |
| 36 MediaQueryTokenType type = startToken->type(); | |
| 37 if (type == DimensionToken) { | |
| 38 int length; | |
| 39 if (!CSSPrimitiveValue::isLength(startToken->unitType())) | |
| 40 return false; | |
| 41 m_viewportDependant = CSSPrimitiveValue::isViewportPercentageLength(star
tToken->unitType()); | |
| 42 if ((m_mediaValues->computeLength(startToken->numericValue(), startToken
->unitType(), length)) && (length > 0)) { | |
| 43 result = (unsigned)length; | |
| 44 return true; | |
| 45 } | |
| 46 } else if (type == FunctionToken) { | |
| 47 SizesCalcParser calcParser(startToken, endToken, m_mediaValues); | |
| 48 if (!calcParser.isValid()) | |
| 49 return false; | |
| 50 m_viewportDependant = calcParser.viewportDependant(); | |
| 51 result = calcParser.result(); | |
| 52 return true; | |
| 53 } else if (type == NumberToken && !startToken->numericValue()) { | |
| 54 result = 0; | |
| 55 return true; | |
| 56 } | |
| 57 | |
| 58 return false; | |
| 59 } | |
| 60 | |
| 61 static void reverseSkipIrrelevantTokens(MediaQueryTokenIterator& token, MediaQue
ryTokenIterator startToken) | |
| 62 { | |
| 63 MediaQueryTokenIterator endToken = token; | |
| 64 while (token != startToken && (token->type() == WhitespaceToken || token->ty
pe() == CommentToken || token->type() == EOFToken)) | |
| 65 --token; | |
| 66 if (token != endToken) | |
| 67 ++token; | |
| 68 } | |
| 69 | |
| 70 static void reverseSkipUntilComponentStart(MediaQueryTokenIterator& token, Media
QueryTokenIterator startToken) | |
| 71 { | |
| 72 if (token == startToken) | |
| 73 return; | |
| 74 --token; | |
| 75 if (token->blockType() != MediaQueryToken::BlockEnd) | |
| 76 return; | |
| 77 unsigned blockLevel = 0; | |
| 78 while (token != startToken) { | |
| 79 if (token->blockType() == MediaQueryToken::BlockEnd) { | |
| 80 ++blockLevel; | |
| 81 } else if (token->blockType() == MediaQueryToken::BlockStart) { | |
| 82 --blockLevel; | |
| 83 if (!blockLevel) | |
| 84 break; | |
| 85 } | |
| 86 | |
| 87 --token; | |
| 88 } | |
| 89 } | |
| 90 | |
| 91 bool SizesAttributeParser::mediaConditionMatches(PassRefPtr<MediaQuerySet> media
Condition) | |
| 92 { | |
| 93 // A Media Condition cannot have a media type other then screen. | |
| 94 MediaQueryEvaluator mediaQueryEvaluator(*m_mediaValues); | |
| 95 return mediaQueryEvaluator.eval(mediaCondition.get()); | |
| 96 } | |
| 97 | |
| 98 bool SizesAttributeParser::parseMediaConditionAndLength(MediaQueryTokenIterator
startToken, MediaQueryTokenIterator endToken) | |
| 99 { | |
| 100 MediaQueryTokenIterator lengthTokenStart; | |
| 101 MediaQueryTokenIterator lengthTokenEnd; | |
| 102 | |
| 103 reverseSkipIrrelevantTokens(endToken, startToken); | |
| 104 lengthTokenEnd = endToken; | |
| 105 reverseSkipUntilComponentStart(endToken, startToken); | |
| 106 lengthTokenStart = endToken; | |
| 107 unsigned length; | |
| 108 if (!calculateLengthInPixels(lengthTokenStart, lengthTokenEnd, length)) | |
| 109 return false; | |
| 110 RefPtr<MediaQuerySet> mediaCondition = MediaQueryParser::parseMediaCondition
(startToken, endToken); | |
| 111 if (mediaCondition && mediaConditionMatches(mediaCondition)) { | |
| 112 m_length = length; | |
| 113 m_lengthWasSet = true; | |
| 114 return true; | |
| 115 } | |
| 116 return false; | |
| 117 } | |
| 118 | |
| 119 bool SizesAttributeParser::parse(Vector<MediaQueryToken>& tokens) | |
| 120 { | |
| 121 if (tokens.isEmpty()) | |
| 122 return false; | |
| 123 MediaQueryTokenIterator startToken = tokens.begin(); | |
| 124 MediaQueryTokenIterator endToken; | |
| 125 // Split on a comma token, and send the result tokens to be parsed as (media
-condition, length) pairs | |
| 126 for (MediaQueryTokenIterator token = tokens.begin(); token != tokens.end();
++token) { | |
| 127 if (token->type() == CommaToken) { | |
| 128 endToken = token; | |
| 129 if (parseMediaConditionAndLength(startToken, endToken)) | |
| 130 return true; | |
| 131 startToken = token; | |
| 132 ++startToken; | |
| 133 } | |
| 134 } | |
| 135 endToken = tokens.end(); | |
| 136 return parseMediaConditionAndLength(startToken, --endToken); | |
| 137 } | |
| 138 | |
| 139 unsigned SizesAttributeParser::effectiveSize() | |
| 140 { | |
| 141 if (m_lengthWasSet) | |
| 142 return m_length; | |
| 143 return effectiveSizeDefaultValue(); | |
| 144 } | |
| 145 | |
| 146 unsigned SizesAttributeParser::effectiveSizeDefaultValue() | |
| 147 { | |
| 148 // Returning the equivalent of "100vw" | |
| 149 m_viewportDependant = true; | |
| 150 return m_mediaValues->viewportWidth(); | |
| 151 } | |
| 152 | |
| 153 } // namespace | |
| 154 | |
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