Scanner


1   /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
2    * This file is part of Beaver Parser Generator.                       *
3    * Copyright (C) 2003,2004 Alexander Demenchuk <alder@softanvil.com>.  *
4    * All rights reserved.                                                *
5    * See the file "LICENSE" for the terms and conditions for copying,    *
6    * distribution and modification of Beaver.                            *
7    * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
8   
9   package beaver;
10  
11  import java.io.IOException  ;
12  
13  
14  
15  /**
16   * Defines an interface expected by a generated parser.
17   */
18  public abstract class Scanner
19  {
20      public static class Exception extends java.lang.Exception  
21      {
22          public final int line;
23          public final int column;
24          
25          public Exception(String   msg)
26          {
27              this(0, 0, msg);
28          }
29          
30          public Exception(int line, int column, String   msg)
31          {
32              super(msg);
33              this.line = line;
34              this.column = column;
35          }
36      }
37  
38      public abstract Symbol nextToken() throws IOException  , Scanner.Exception;
39  }
40

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