enhance analyzer to parse uppercase and built-in/pseudo keywords

pkg/front_end/lib/src/fasta/scanner/token.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library fasta.scanner.token;
 
 import '../../scanner/token.dart' as analyzer;
 
 import 'keyword.dart' show Keyword;
 
 import 'precedence.dart'
     show
         AS_INFO,
         BAD_INPUT_INFO,
         EOF_INFO,
-        IDENTIFIER_INFO,
         IS_INFO,
         KEYWORD_INFO,
         PrecedenceInfo;
 
 import 'token_constants.dart' show IDENTIFIER_TOKEN;
 
 import 'string_canonicalizer.dart';
 
 /**
  * A token that doubles as a linked list.
@@ skipping 324 matching lines @@
   bool get isPseudo => keyword.isPseudo;
 
   bool get isBuiltInIdentifier => keyword.isBuiltIn;
 
   String toString() => "KeywordToken($lexeme)";
 
   @override
   Token copyWithoutComments() => new KeywordToken(keyword, charOffset);
 
   @override
-  // Analyzer considers pseudo-keywords to have a different value
-  Object value() => isPseudo ? lexeme : keyword;
+  Keyword value() => keyword;
 
   @override
-  // Analyzer considers pseudo-keywords to be identifiers
-  analyzer.TokenType get type => isPseudo ? IDENTIFIER_INFO : KEYWORD_INFO;
+  analyzer.TokenType get type => KEYWORD_INFO;
 }
 
 /**
  * A synthetic keyword token.
  */
 class SyntheticKeywordToken extends KeywordToken
     implements analyzer.SyntheticKeywordToken {
   /**
    * Initialize a newly created token to represent the given [keyword] at the
    * given [offset].
@@ skipping 316 matching lines @@
       identical(value, "<=") ||
       identical(value, "<") ||
       identical(value, "&") ||
       identical(value, "^") ||
       identical(value, "|");
 }
 
 bool isTernaryOperator(String value) => identical(value, "[]=");
 
 bool isMinusOperator(String value) => identical(value, "-");