A thread-safe Media Query Parser

Source/core/css/parser/MediaQueryParser.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 MediaQueryParser_h
+#define MediaQueryParser_h
+
+#include "wtf/Vector.h"
+#include "wtf/text/WTFString.h"
+
+namespace WebCore {
+
+class MediaQuery;
+class MediaQuerySet;
+class CSSToken;
+
+class MediaQueryParser {
+public:
+    static PassRefPtr<MediaQuerySet> parse(String);
+
+private:
+    MediaQueryParser(String);
+    virtual ~MediaQueryParser() { };
+
+    PassRefPtr<MediaQuerySet> parseImpl();
+
+    enum State {
+        ReadRestrictor,
+        ReadMediaType,
+        ReadAnd,
+        ReadFeatureStart,
+        ReadFeature,
+        ReadFeatureColon,
+        ReadFeatureValue,
+        ReadFeatureEnd,
+        SkipTillComma,
+        SkipTillParen
+    };
+
+    State m_state;
+    Vector<CSSToken> m_tokens;

[eseidel, 2014/02/18 23:24:01]

It turns out we already sort have a CSSToken in our current code, it's just
called CSSParserValueList and CSSParserValue.  I think the lifetime of these
objects is slightly complicated due to the silly float/sink stuff for bison, so
we may end up creating a new CSSToken type anyway.

+};
+
+} // namespace WebCore
+
+#endif // MediaQueryParser_h