01: /*
02: * gnu/regexp/RETokenBackRef.java
03: * Copyright (C) 1998 Wes Biggs
04: *
05: * This library is free software; you can redistribute it and/or modify
06: * it under the terms of the GNU Library General Public License as published
07: * by the Free Software Foundation; either version 2 of the License, or
08: * (at your option) any later version.
09: *
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 Library General Public License for more details.
14: *
15: * You should have received a copy of the GNU Library 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: class RETokenBackRef extends REToken {
23: private int num;
24: private boolean insens;
25:
26: RETokenBackRef(int f_subIndex, int mynum, boolean ins) {
27: super (f_subIndex);
28: insens = ins;
29: num = mynum;
30: }
31:
32: // should implement getMinimumLength() -- any ideas?
33:
34: int[] match(CharIndexed input, int index, int eflags,
35: REMatch mymatch) {
36: int b, e;
37: b = mymatch.start[num];
38: e = mymatch.end[num];
39: if ((b == -1) || (e == -1))
40: return null; // this shouldn't happen, but...
41: for (int i = b; i < e; i++) {
42: if (input.charAt(index + i - b) != input.charAt(i))
43: return null;
44: }
45:
46: return next(input, index + e - b, eflags, mymatch);
47: }
48:
49: void dump(StringBuffer os) {
50: os.append('\\').append(num);
51: }
52: }
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