CSS Custom Properties (Variables)

Source/core/css/parser/CSSParserToken.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 CSSParserToken_h
 #define CSSParserToken_h
 
 #include "core/CoreExport.h"
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/parser/CSSParserString.h"
@@ skipping 27 matching lines @@
     LeftParenthesisToken,
     RightParenthesisToken,
     LeftBracketToken,
     RightBracketToken,
     LeftBraceToken,
     RightBraceToken,
     StringToken,
     BadStringToken,
     EOFToken,
     CommentToken,
+    VariableReferenceToken,

[alancutter (OOO until 2018), 2015/07/14 06:12:57]

This is never used.

 };
 
 enum NumericSign {
     NoSign,
     PlusSign,
     MinusSign,
 };
 
 enum NumericValueType {
     IntegerValueType,
     NumberValueType,
 };
 
 enum HashTokenType {
     HashTokenId,
     HashTokenUnrestricted,
 };
 
+class CSSVariableData;
+
 class CORE_EXPORT CSSParserToken {
 public:
     enum BlockType {
         NotBlock,
         BlockStart,
         BlockEnd,
     };
 
     CSSParserToken(CSSParserTokenType, BlockType = NotBlock);
     CSSParserToken(CSSParserTokenType, CSSParserString, BlockType = NotBlock);
@@ skipping 55 matching lines @@
     union {
         UChar m_delimiter;
         HashTokenType m_hashTokenType;
         double m_numericValue;
 
         struct {
             UChar32 start;
             UChar32 end;
         } m_unicodeRange;
     };
+
+    friend CSSVariableData;
 };
 
 } // namespace blink
 
 namespace WTF {
 template <>
 struct IsTriviallyMoveAssignable<blink::CSSParserToken> {
     static const bool value = true;
 };
 }
 
 #endif // CSSSParserToken_h