01: /*
02: * gnu/regexp/RETokenBackRef.java
03: * Copyright (C) 1998-2001 Wes Biggs
04: *
05: * This library is free software; you can redistribute it and/or modify
06: * it under the terms of the GNU Lesser General Public License as published
07: * by the Free Software Foundation; either version 2.1 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 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))
39: return false; // this shouldn't happen, but...
40: for (int i = b; i < e; i++) {
41: if (input.charAt(mymatch.index + i - b) != input.charAt(i)) {
42: return false;
43: }
44: }
45: mymatch.index += e - b;
46: return next(input, mymatch);
47: }
48:
49: void dump(StringBuffer os) {
50: os.append('\\').append(num);
51: }
52: }
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