new TokenType and Keyword API

pkg/front_end/lib/src/fasta/scanner/keyword_state.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.keywords;
 
 import '../../scanner/token.dart' as analyzer;
 
 import 'characters.dart' show $a, $z, $A, $Z;
 
 /**
  * Abstract state in a state machine for scanning keywords.
  */
 abstract class KeywordState {
   KeywordState next(int c);
   KeywordState nextCapital(int c);
 
   analyzer.Keyword get keyword;
 
   static KeywordState _KEYWORD_STATE;
   static KeywordState get KEYWORD_STATE {
     if (_KEYWORD_STATE == null) {
       List<String> strings = new List<String>(analyzer.Keyword.values.length);
       for (int i = 0; i < analyzer.Keyword.values.length; i++) {
-        strings[i] = analyzer.Keyword.values[i].syntax;
+        strings[i] = analyzer.Keyword.values[i].lexeme;
       }
       strings.sort((a, b) => a.compareTo(b));
       _KEYWORD_STATE = computeKeywordStateTable(0, strings, 0, strings.length);
     }
     return _KEYWORD_STATE;
   }
 
   static KeywordState computeKeywordStateTable(
       int start, List<String> strings, int offset, int length) {
     bool isLowercase = true;
@@ skipping 101 matching lines @@
  * A state that has no outgoing transitions.
  */
 class LeafKeywordState implements KeywordState {
   final analyzer.Keyword keyword;
 
   LeafKeywordState(String syntax) : keyword = analyzer.Keyword.keywords[syntax];
 
   KeywordState next(int c) => null;
   KeywordState nextCapital(int c) => null;
 
-  String toString() => keyword.syntax;
+  String toString() => keyword.lexeme;
 }