GrammarSymbol


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.spec;
10  
11  import java.util.Comparator  ;
12  
13  /**
14   * Represents symbols of the grammar.
15   */
16  public abstract class GrammarSymbol
17  {
18      /** This symbol's ID */
19      public short id;
20      
21      /** Name of the symbol */
22      public final String   name;
23  
24      /** The type of data held by this symbol. */
25      public String   type;
26      
27      /** Number of times this symbol is referenced in productions */
28      public int nrefs;
29      
30      GrammarSymbol(String   name)
31      {
32          this.name = name;
33      }
34  
35      GrammarSymbol(String   name, String   type)
36      {
37          this.name = name;
38          this.type = type;
39      }
40      
41      public String   toString()
42      {
43          return name;
44      }
45      
46      public static final Comparator   NUMBER_OF_REFERENCES_COMPARATOR = new Comparator  ()
47      {
48          public int compare(Object   sym1, Object   sym2)
49          {
50              return ((GrammarSymbol) sym2).nrefs - ((GrammarSymbol) sym1).nrefs;
51          }   
52      };
53  }
54
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