Index: Source/core/css/parser/SizesAttributeParser.cpp |
diff --git a/Source/core/css/parser/SizesAttributeParser.cpp b/Source/core/css/parser/SizesAttributeParser.cpp |
new file mode 100644 |
index 0000000000000000000000000000000000000000..dca1ace194f1a8c0483646db3c29e4f76235657c |
--- /dev/null |
+++ b/Source/core/css/parser/SizesAttributeParser.cpp |
@@ -0,0 +1,134 @@ |
+// Copyright 2014 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#include "config.h" |
+#include "SizesAttributeParser.h" |
+ |
+#include "MediaTypeNames.h" |
+#include "core/css/MediaQueryEvaluator.h" |
+#include "core/css/parser/MediaQueryTokenizer.h" |
+ |
+namespace WebCore { |
+ |
+unsigned SizesAttributeParser::findEffectiveSize(const String& attribute, PassRefPtr<MediaValues> mediaValues) |
+{ |
+ Vector<MediaQueryToken> tokens; |
+ SizesAttributeParser parser(mediaValues); |
+ |
+ MediaQueryTokenizer::tokenize(attribute, tokens); |
+ if (!parser.parse(tokens)) |
+ return parser.effectiveSizeDefaultValue(); |
+ return parser.effectiveSize(); |
+} |
+ |
+bool SizesAttributeParser::calculateLengthInPixels(TokenIterator startToken, TokenIterator endToken, unsigned& result) |
+{ |
+ MediaQueryTokenType type = startToken->type(); |
+ if (type == DimensionToken) { |
+ int length; |
+ if (!CSSPrimitiveValue::isLength(startToken->unitType())) |
+ return false; |
+ if (m_mediaValues->computeLength(startToken->numericValue(), startToken->unitType(), length)) { |
+ if (length > 0) { |
+ result = (unsigned)length; |
+ return true; |
+ } |
+ } |
+ } |
+ if (type == FunctionToken) { |
+ // FIXME - Handle calc() functions here! |
+ } |
+ return false; |
+} |
+ |
+static void reverseSkipIrrelevantTokens(TokenIterator& token, TokenIterator startToken) |
+{ |
+ TokenIterator endToken = token; |
+ while (token != startToken && (token->type() == WhitespaceToken || token->type() == CommentToken || token->type() == EOFToken)) |
+ --token; |
+ if (token != endToken) |
+ ++token; |
+} |
+ |
+static void reverseSkipUntilComponentStart(TokenIterator& token, TokenIterator startToken) |
+{ |
+ if (token == startToken) |
+ return; |
+ --token; |
+ if (token->blockType() != MediaQueryToken::BlockEnd) |
+ return; |
+ unsigned blockLevel = 0; |
+ while (token != startToken) { |
+ if (token->blockType() == MediaQueryToken::BlockEnd) { |
+ ++blockLevel; |
+ } else if (token->blockType() == MediaQueryToken::BlockStart) { |
+ --blockLevel; |
+ if (!blockLevel) |
+ break; |
+ } |
+ |
+ --token; |
+ } |
+} |
+ |
+bool SizesAttributeParser::mediaConditionMatches(PassRefPtr<MediaQuerySet> mediaCondition) |
+{ |
+ // FIXME: How do I handle non-screen media types here? |
+ MediaQueryEvaluator mediaQueryEvaluator(MediaTypeNames::screen, *m_mediaValues); |
+ return mediaQueryEvaluator.eval(mediaCondition.get()); |
+} |
+ |
+bool SizesAttributeParser::parseMediaConditionAndLength(TokenIterator startToken, TokenIterator endToken) |
+{ |
+ TokenIterator lengthTokenStart; |
+ TokenIterator lengthTokenEnd; |
+ |
+ reverseSkipIrrelevantTokens(endToken, startToken); |
+ lengthTokenEnd = endToken; |
+ reverseSkipUntilComponentStart(endToken, startToken); |
+ lengthTokenStart = endToken; |
+ unsigned length; |
+ if (!calculateLengthInPixels(lengthTokenStart, lengthTokenEnd, length)) |
+ return false; |
+ RefPtr<MediaQuerySet> mediaCondition = MediaQueryParser::parseMediaCondition(startToken, endToken); |
+ if (mediaCondition && mediaConditionMatches(mediaCondition)) { |
+ m_length = length; |
+ return true; |
+ } |
+ return false; |
+} |
+ |
+bool SizesAttributeParser::parse(Vector<MediaQueryToken>& tokens) |
+{ |
+ TokenIterator startToken = tokens.begin(); |
+ TokenIterator endToken; |
+ // Split on a comma token, and send the result tokens to be parsed as (media-condition, length) pairs |
+ for (TokenIterator token = tokens.begin(); token != tokens.end(); ++token) { |
+ if (token->type() == CommaToken) { |
+ endToken = token; |
+ if (parseMediaConditionAndLength(startToken, endToken)) |
+ return true; |
+ startToken = token; |
+ ++startToken; |
+ } |
+ } |
+ endToken = tokens.end(); |
+ return parseMediaConditionAndLength(startToken, --endToken); |
+} |
+ |
+unsigned SizesAttributeParser::effectiveSize() |
+{ |
+ if (m_length) |
+ return m_length; |
+ return effectiveSizeDefaultValue(); |
+} |
+ |
+unsigned SizesAttributeParser::effectiveSizeDefaultValue() |
+{ |
+ // Returning the equivalent of "100%" |
+ return m_mediaValues->viewportWidth(); |
+} |
+ |
+} // namespace |
+ |