TokenCharLiteral


1   /*****************************************************************************
2    * Copyright (C) Zephyr Business Solutions Corp. All rights reserved.            *
3    * ------------------------------------------------------------------------- *
4    * The software in this package is published under the terms of the BSD      *
5    * style license a copy of which has been included with this distribution in *
6    * the LICENSE.txt file.                                                     *
7    *****************************************************************************/
8   /*
9    * Created on 2004-11-7
10   *
11   * Author Ben Yu
12   */
13  package jfun.parsec.tokens;
14  
15  import jfun.parsec.Tokenizer;
16  
17  /**
18   * Represents a character.
19   * @author Ben Yu
20   *
21   * 2004-11-7
22   */
23  @Deprecated  
24  public class TokenCharLiteral implements java.io.Serializable  {
25    /**
26     * convert the characters contained in range [from, from+len)
27     * to a character.
28     * @param cs the character sequence.
29     * @param from the starting index.
30     * @param len the length of the range.
31     * @return the character.
32     */
33    public static char tokenize(final CharSequence   cs, 
34        final int from, final int len){
35      if(len == 3){
36        return cs.charAt(from+1);
37      }
38      else if(len == 4){
39        return cs.charAt(from+2);
40      }
41      else throw new IllegalStateException  ("illegal char");
42    }
43    private TokenCharLiteral(){}
44    private static final Tokenizer cTokenizer = new Tokenizer(){
45      public Object   toToken(final CharSequence   cs, 
46          final int from, final int len){
47        return new Character  (tokenize(cs, from, len));
48      };
49    };
50    /**
51     * Creates a tokenizer that's gonna tokenize a single quoted character literal possibly with escape character '\'
52     * @return the tokenizer instance.
53     */
54    public static Tokenizer getTokenizer(){return cTokenizer;}
55  }
56
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