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Java > Open Source Codes > gnu > regexp > RETokenBackRef


1 /*
2  * gnu/regexp/RETokenBackRef.java
3  * Copyright (C) 1998-2001 Wes Biggs
4  *
5  * This library is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU Lesser General Public License as published
7  * by the Free Software Foundation; either version 2.1 of the License, or
8  * (at your option) any later version.
9  *
10  * This library is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18  */
19
20 package gnu.regexp;
21
22 final class RETokenBackRef extends REToken {
23   private int num;
24   private boolean insens;
25   
26   RETokenBackRef(int subIndex, int num, boolean insens) {
27     super(subIndex);
28     this.num = num;
29     this.insens = insens;
30   }
31
32   // should implement getMinimumLength() -- any ideas?
33
34     boolean match(CharIndexed input, REMatch mymatch) {
35     int b,e;
36     b = mymatch.start[num];
37     e = mymatch.end[num];
38     if ((b==-1)||(e==-1)) return false; // this shouldn't happen, but...
39 for (int i=b; i<e; i++) {
40         if (input.charAt(mymatch.index+i-b) != input.charAt(i)) {
41         return false;
42         }
43     }
44     mymatch.index += e-b;
45     return next(input, mymatch);
46     }
47     
48     void dump(StringBuffer JavaDoc os) {
49     os.append('\\').append(num);
50     }
51 }
52
53
54
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