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Unified Diff: third_party/WebKit/Source/core/css/parser/CSSVariableParser.cpp

Issue 1192983003: CSS Custom Properties (Variables) (Closed) Base URL: svn://svn.chromium.org/blink/trunk
Patch Set: Use m_unit Created 5 years, 1 month ago
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Index: third_party/WebKit/Source/core/css/parser/CSSVariableParser.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/CSSVariableParser.cpp b/third_party/WebKit/Source/core/css/parser/CSSVariableParser.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..94463b1da72db65a904d8b080e501377ac49d21c
--- /dev/null
+++ b/third_party/WebKit/Source/core/css/parser/CSSVariableParser.cpp
@@ -0,0 +1,123 @@
+// Copyright 2015 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 "core/css/parser/CSSVariableParser.h"
+
+#include "core/css/CSSCustomPropertyDeclaration.h"
+#include "core/css/parser/CSSParserTokenRange.h"
+#include "core/css/parser/CSSParserValues.h"
+
+namespace blink {
+
+bool CSSVariableParser::isValidVariableName(const CSSParserToken& token)
+{
+ if (token.type() != IdentToken)
+ return false;
+
+ CSSParserString value = token.value();
+ return value.length() >= 2 && value[0] == '-' && value[1] == '-';
+}
+
+bool isValidVariableReference(CSSParserTokenRange);
+
+bool classifyBlock(CSSParserTokenRange range, bool& hasReferences, bool isTopLevelBlock = true)
+{
+ while (!range.atEnd()) {
+ if (range.peek().blockType() == CSSParserToken::BlockStart) {
+ const CSSParserToken& token = range.peek();
+ CSSParserTokenRange block = range.consumeBlock();
+ if (token.functionId() == CSSValueVar) {
+ if (!isValidVariableReference(block))
+ return false; // Bail if any references are invalid
+ hasReferences = true;
+ continue;
+ }
+ if (!classifyBlock(block, hasReferences, false))
+ return false;
+ continue;
+ }
+
+ ASSERT(range.peek().blockType() != CSSParserToken::BlockEnd);
+
+ const CSSParserToken& token = range.consume();
+ switch (token.type()) {
+ case DelimiterToken: {
+ if (token.delimiter() == '!' && isTopLevelBlock)
+ return false;
+ break;
+ }
+ case RightParenthesisToken:
+ case RightBraceToken:
+ case RightBracketToken:
+ case BadStringToken:
+ case BadUrlToken:
+ return false;
+ case SemicolonToken:
+ if (isTopLevelBlock)
+ return false;
+ break;
+ default:
+ break;
+ }
+ }
+ return true;
+}
+
+bool isValidVariableReference(CSSParserTokenRange range)
+{
+ range.consumeWhitespace();
+ if (!CSSVariableParser::isValidVariableName(range.consumeIncludingWhitespace()))
+ return false;
+ if (range.atEnd())
+ return true;
+
+ if (range.consume().type() != CommaToken)
+ return false;
+ if (range.atEnd())
+ return false;
+
+ bool hasReferences = false;
+ return classifyBlock(range, hasReferences);
+}
+
+static CSSValueID classifyVariableRange(CSSParserTokenRange range, bool& hasReferences)
+{
+ hasReferences = false;
+
+ range.consumeWhitespace();
+ if (range.peek().type() == IdentToken) {
+ CSSValueID id = range.consumeIncludingWhitespace().id();
+ if (range.atEnd() && (id == CSSValueInherit || id == CSSValueInitial || id == CSSValueUnset))
+ return id;
+ }
+
+ if (classifyBlock(range, hasReferences))
+ return CSSValueInternalVariableValue;
+ return CSSValueInvalid;
+}
+
+bool CSSVariableParser::containsValidVariableReferences(CSSParserTokenRange range)
+{
+ bool hasReferences;
+ CSSValueID type = classifyVariableRange(range, hasReferences);
+ return type == CSSValueInternalVariableValue && hasReferences;
+}
+
+PassRefPtrWillBeRawPtr<CSSCustomPropertyDeclaration> CSSVariableParser::parseDeclarationValue(const AtomicString& variableName, CSSParserTokenRange range)
+{
+ if (range.atEnd())
+ return nullptr;
+
+ bool hasReferences;
+ CSSValueID type = classifyVariableRange(range, hasReferences);
+
+ if (type == CSSValueInvalid)
+ return nullptr;
+ if (type == CSSValueInternalVariableValue)
+ return CSSCustomPropertyDeclaration::create(variableName, CSSVariableData::create(range, hasReferences));
+ return CSSCustomPropertyDeclaration::create(variableName, type);
+}
+
+} // namespace blink

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