A thread-safe Media Query Parser

Source/core/css/parser/MediaQueryTokenizer.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 MediaQueryTokenizer_h
+#define MediaQueryTokenizer_h
+
+#include "core/css/parser/MediaQueryToken.h"
+#include "core/html/parser/InputStreamPreprocessor.h"
+#include "wtf/text/WTFString.h"
+
+#include <climits>
+
+namespace WebCore {
+
+class MediaQueryInputStream;
+
+class MediaQueryTokenizer {
+    WTF_MAKE_NONCOPYABLE(MediaQueryTokenizer);
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    static void tokenize(String, Vector<MediaQueryToken>&);
+
+private:
+    class CodePoints;
+
+    MediaQueryTokenizer(MediaQueryInputStream&);
+
+    MediaQueryToken nextToken();
+
+    UChar consume();
+    void consume(unsigned);
+    void reconsume(UChar);
+
+    MediaQueryToken consumeNumericToken();
+    MediaQueryToken consumeIdentLikeToken();
+    MediaQueryToken consumeNumber();
+
+    void consumeUntilNonWhitespace();
+
+    bool consumeIfNext(UChar);
+    String consumeName();
+    UChar consumeEscape();
+
+    bool nextTwoCharsAreValidEscape();
+    bool nextCharsAreNumber();
+    bool nextCharsAreIdentifier();
+
+    typedef MediaQueryToken (MediaQueryTokenizer::*CodePoint)(UChar);
+
+    MediaQueryToken whiteSpace(UChar);
+    MediaQueryToken leftParenthesis(UChar);
+    MediaQueryToken rightParenthesis(UChar);
+    MediaQueryToken plusOrFullStop(UChar);
+    MediaQueryToken comma(UChar);
+    MediaQueryToken hyphenMinus(UChar);
+    MediaQueryToken solidus(UChar);
+    MediaQueryToken colon(UChar);
+    MediaQueryToken semiColon(UChar);
+    MediaQueryToken reverseSolidus(UChar);
+    MediaQueryToken asciiDigit(UChar);
+    MediaQueryToken nameStart(UChar);
+    MediaQueryToken endOfFile(UChar);
+
+    CodePoints* codePoints();
+
+    MediaQueryInputStream& m_input;
+};
+
+
+
+} // namespace WebCore
+
+#endif // MediaQueryTokenizer_h