A thread-safe Media Query Parser

Source/core/css/parser/MediaQueryToken.h

+// 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.
+
+#ifndef MediaQueryToken_h
+#define MediaQueryToken_h
+
+#include "core/css/CSSPrimitiveValue.h"
+#include "wtf/text/WTFString.h"
+
+namespace WebCore {
+
+enum MediaQueryTokenType {
+    IdentToken = 0,
+    FunctionToken = 1,
+    DelimiterToken = 2,
+    NumberToken = 3,
+    PercentageToken = 4,
+    DimensionToken = 5,
+    WhitespaceToken = 6,
+    ColonToken = 7,
+    SemicolonToken = 8,
+    CommaToken = 9,
+    LeftParenthesisToken = 10,
+    RightParenthesisToken = 11,
+    EOFToken = 12,
+};
+
+enum NumericValueType {
+    IntegerValueType,
+    NumberValueType,
+};
+
+class MediaQueryToken {
+public:
+    MediaQueryToken(MediaQueryTokenType);
+    MediaQueryToken(MediaQueryTokenType, String);
+
+    MediaQueryToken(MediaQueryTokenType, UChar); // for DelimiterToken
+    MediaQueryToken(MediaQueryTokenType, double, NumericValueType); // for NumberToken
+
+    // Converts NumberToken to DimensionToken.
+    void convertToDimensionWithUnit(String);
+
+    // Converts NumberToken to PercentageToken.
+    void convertToPercentage();
+
+    MediaQueryTokenType type() const { return m_type; }
+    String value() const { return m_value; }
+
+    UChar delimiter() const { return m_delimiter; }
+    NumericValueType numericValueType() const { return m_numericValueType; }
+    double numericValue() const { return m_numericValue; }
+    CSSPrimitiveValue::UnitTypes unitType() const { return m_unit; }
+
+private:
+    MediaQueryTokenType m_type;
+    String m_value;
+
+    UChar m_delimiter; // Could be rolled into m_value?
+
+    NumericValueType m_numericValueType;
+    double m_numericValue;
+    CSSPrimitiveValue::UnitTypes m_unit;
+};
+
+}
+
+#endif // MediaQueryToken_h