merge PrecedenceInfo into TokenType and update all refs

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 '../../scanner/token.dart' show TokenType;
 
-import 'precedence.dart'
-    show AS_INFO, BAD_INPUT_INFO, EOF_INFO, IS_INFO, KEYWORD_INFO;
-
 import 'token_constants.dart' show IDENTIFIER_TOKEN;
 
 import 'string_canonicalizer.dart';
 
 /**
  * A token that doubles as a linked list.
  */
 abstract class Token implements analyzer.TokenWithComment {
   /**
    * The character offset of the start of this token within the source text.
@@ skipping 92 matching lines @@
    * token 'foo'.
    *
    * Use [lexeme] for the text actually parsed by the token.
    */
   String toString();
 
   /**
    * The number of characters parsed by this token.
    */
   int get charCount {
-    if (info == BAD_INPUT_INFO) {
+    if (info == analyzer.TokenType.BAD_INPUT) {
       // This is a token that wraps around an error message. Return 1
       // instead of the size of the length of the error message.
       return 1;
     } else {
       return lexeme.length;
     }
   }
 
   /// The character offset of the end of this token within the source text.
   int get charEnd => charOffset + charCount;
 
   bool get isEof => false;
 
   bool get isBuiltInIdentifier => false;
 
   @override
   bool get isOperator => info.isOperator;
 
   @override
   bool get isUserDefinableOperator => info.isUserDefinableOperator;
 
   @override
   analyzer.TokenType get type {
     // Analyzer has a different concept of what is a Keyword type.
-    return info == AS_INFO || info == IS_INFO ? KEYWORD_INFO : info;
+    return info == TokenType.AS || info == TokenType.IS
+        ? TokenType.KEYWORD
+        : info;
   }
 
   @override
   int get offset => charOffset;
 
   @override
   set offset(int newOffset) {
     charOffset = newOffset;
   }
 
@@ skipping 81 matching lines @@
 /**
  * A [SymbolToken] represents the symbol in its precedence info.
  * Also used for end of file with EOF_INFO.
  */
 class SymbolToken extends Token {
   final TokenType info;
 
   SymbolToken(this.info, int charOffset) : super(charOffset);
 
   factory SymbolToken.eof(int charOffset) {
-    var eof = new SyntheticSymbolToken(EOF_INFO, charOffset);
+    var eof = new SyntheticSymbolToken(analyzer.TokenType.EOF, charOffset);
     // EOF points to itself so there's always infinite look-ahead.
     eof.previousToken = eof;
     eof.next = eof;
     return eof;
   }
 
   @override
   String get lexeme => info.value;
 
   @override
   String get stringValue => info.value;
 
   @override
   bool isIdentifier() => false;
 
   @override
   String toString() => "SymbolToken(${isEof ? '-eof-' : lexeme})";
 
   @override
-  bool get isEof => info == EOF_INFO;
+  bool get isEof => info == analyzer.TokenType.EOF;
 
   @override
   Token copyWithoutComments() => isEof
       ? new SymbolToken.eof(charOffset)
       : new SymbolToken(info, charOffset);
 }
 
 /**
  * A [SyntheticSymbolToken] represents the symbol in its precedence info
  * which does not exist in the original source.
@@ skipping 62 matching lines @@
 
   String toString() => "KeywordToken($lexeme)";
 
   @override
   Token copyWithoutComments() => new KeywordToken(keyword, charOffset);
 
   @override
   analyzer.Keyword value() => keyword;
 
   @override
-  analyzer.TokenType get type => KEYWORD_INFO;
+  analyzer.TokenType get type => TokenType.KEYWORD;
 }
 
 /**
  * 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 317 matching lines @@
       identical(value, "<=") ||
       identical(value, "<") ||
       identical(value, "&") ||
       identical(value, "^") ||
       identical(value, "|");
 }
 
 bool isTernaryOperator(String value) => identical(value, "[]=");
 
 bool isMinusOperator(String value) => identical(value, "-");