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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 "SizesAttributeParser.h" | |
7 | |
8 #include "core/css/MediaQueryEvaluator.h" | |
9 #include "core/css/parser/MediaQueryTokenizer.h" | |
10 | |
11 namespace WebCore { | |
12 | |
13 enum { EffectiveSizeDefaultValue = 300 }; | |
eseidel
2014/04/08 06:02:14
I know you were encouraged to do these as Enums be
rune
2014/04/08 10:34:42
That would have been me. I based it on how it's mo
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14 | |
15 int SizesAttributeParser::findEffectiveSize(const String& attribute, PassRefPtr< MediaValues> mediaValues) | |
16 { | |
17 Vector<MediaQueryToken> tokens; | |
18 SizesAttributeParser parser(mediaValues); | |
19 | |
20 MediaQueryTokenizer::tokenize(attribute, tokens); | |
21 if (!parser.parseImpl(tokens)) | |
eseidel
2014/04/08 06:02:14
Why parseImpl and not just parse?
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22 return EffectiveSizeDefaultValue; | |
23 return parser.effectiveSize(); | |
24 } | |
25 | |
26 int SizesAttributeParser::calculateLengthInPixels(TokenIterator startToken, Toke nIterator endToken) | |
27 { | |
28 // FIXME - make this actually do something! | |
29 return 0; | |
30 } | |
31 | |
32 static void goBackWhileWhitespaceToken(TokenIterator& token, TokenIterator start Token) | |
eseidel
2014/04/08 06:02:14
Other parser have used:
template<type UntilFuncti
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33 { | |
34 while (token != startToken && token->type() == WhitespaceToken) | |
35 --token; | |
36 } | |
37 | |
38 static void goBackUntilWhitespaceToken(TokenIterator& token, TokenIterator start Token) | |
39 { | |
40 while (token != startToken && token->type() != WhitespaceToken) | |
41 --token; | |
42 } | |
43 | |
44 bool SizesAttributeParser::mediaConditionMatches(PassRefPtr<MediaQuerySet> media Condition) | |
45 { | |
46 // FIXME: How do I handle non-screen media types here? | |
47 // FIXME2: Replaces "screen" with a static string | |
48 MediaQueryEvaluator mediaQueryEvaluator("screen", m_mediaValues); | |
eseidel
2014/04/08 06:02:14
IIRC you have some StaticStrings for media types,
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49 return mediaQueryEvaluator.eval(mediaCondition.get()); | |
50 } | |
51 | |
52 bool SizesAttributeParser::parseMediaConditionAndLength(TokenIterator startToken , TokenIterator endToken) | |
53 { | |
54 TokenIterator lengthTokenStart; | |
55 TokenIterator lengthTokenEnd; | |
56 | |
57 goBackWhileWhitespaceToken(endToken, startToken); | |
eseidel
2014/04/08 06:02:14
I see, so these would be "reverseFind" in a string
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58 lengthTokenEnd = endToken; | |
59 goBackUntilWhitespaceToken(endToken, startToken); | |
60 lengthTokenStart = endToken; | |
61 ++lengthTokenStart; | |
62 int length = calculateLengthInPixels(lengthTokenStart, lengthTokenEnd); | |
63 RefPtr<MediaQuerySet> mediaCondition = MediaQueryParser::parseMediaCondition (startToken, endToken); | |
64 if (!mediaCondition || mediaCondition->queryVector().isEmpty()) | |
65 m_defaultLength = length; | |
66 else if (mediaConditionMatches(mediaCondition)) | |
67 m_length = length; | |
68 else | |
69 return false; | |
70 return true; | |
71 } | |
72 | |
73 bool SizesAttributeParser::parseImpl(Vector<MediaQueryToken>& tokens) | |
74 { | |
75 TokenIterator startToken = tokens.begin(); | |
76 TokenIterator endToken; | |
77 // Split on a comma token, and send the result tokens to be parsed as (media -condition, length) pairs | |
78 for (TokenIterator token = tokens.begin(); token != tokens.end(); ++token) { | |
79 if (token->type() == CommaToken) { | |
80 endToken = token; | |
81 --endToken; | |
82 if (parseMediaConditionAndLength(startToken, endToken)) | |
83 return true; | |
84 startToken = token; | |
85 ++startToken; | |
86 } | |
87 } | |
88 return parseMediaConditionAndLength(startToken, tokens.end()); | |
89 } | |
90 | |
91 int SizesAttributeParser::effectiveSize() | |
92 { | |
93 // FIXME - implement the "find effective size" algorithm! | |
94 return 0; | |
95 } | |
96 | |
97 } // namespace | |
98 | |
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