Get Media Query parser to handle parens, brackets and braces blocks correctly

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 "core/css/CSSParserValues.h"
 #include "core/css/MediaList.h"
 #include "core/css/MediaQuery.h"
@@ skipping 40 matching lines @@
     static PassRefPtrWillBeRawPtr<MediaQuerySet> parse(const String&);
 
 private:
     MediaQueryParser(const String&);
     virtual ~MediaQueryParser() { };
 
     PassRefPtrWillBeRawPtr<MediaQuerySet> parseImpl();
 
     typedef Vector<MediaQueryToken>::iterator TokenIterator;
 
+    enum BlockType {
+        ParenthesisBlock,
+        BracketsBlock,
+        BracesBlock
+    };
+
+    enum StateChange {
+        ModifyState,
+        DoNotModifyState
+    };
+
+    struct BlockParameters {
+        MediaQueryTokenType leftToken;
+        MediaQueryTokenType rightToken;
+        BlockType blockType;
+        StateChange stateChange;
+    };
+
     void processToken(TokenIterator&);
 
     void readRestrictor(MediaQueryTokenType, TokenIterator&);
     void readMediaType(MediaQueryTokenType, TokenIterator&);
     void readAnd(MediaQueryTokenType, TokenIterator&);
     void readFeatureStart(MediaQueryTokenType, TokenIterator&);
     void readFeature(MediaQueryTokenType, TokenIterator&);
     void readFeatureColon(MediaQueryTokenType, TokenIterator&);
     void readFeatureValue(MediaQueryTokenType, TokenIterator&);
     void readFeatureEnd(MediaQueryTokenType, TokenIterator&);
     void skipUntilComma(MediaQueryTokenType, TokenIterator&);
-    void skipUntilParenthesis(MediaQueryTokenType, TokenIterator&);
+    void skipUntilBlockEnd(MediaQueryTokenType, TokenIterator&);
     void done(MediaQueryTokenType, TokenIterator&);
 
     typedef void (MediaQueryParser::*State)(MediaQueryTokenType, TokenIterator&);
 
     void setStateAndRestrict(State, MediaQuery::Restrictor);
+    bool observeBlock(BlockParameters&, MediaQueryTokenType);
+    void observeBlocks(MediaQueryTokenType);
+    static void popIfBlockMatches(Vector<MediaQueryParser::BlockType>& blockStack, BlockType);
 
     State m_state;
     Vector<MediaQueryToken> m_tokens;
     MediaQueryData m_mediaQueryData;
     RefPtrWillBeMember<MediaQuerySet> m_querySet;
+    Vector<BlockType> m_blockStack;
 
     const static State ReadRestrictor;
     const static State ReadMediaType;
     const static State ReadAnd;
     const static State ReadFeatureStart;
     const static State ReadFeature;
     const static State ReadFeatureColon;
     const static State ReadFeatureValue;
     const static State ReadFeatureEnd;
     const static State SkipUntilComma;
-    const static State SkipUntilParenthesis;
+    const static State SkipUntilBlockEnd;
     const static State Done;
 
 };
 
 } // namespace WebCore
 
 #endif // MediaQueryParser_h