2 * gnu/regexp/REToken.java
3 * Copyright (C) 1998-2001 Wes Biggs
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.
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.
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.
21 import java.io.Serializable;
23 abstract class REToken implements Serializable {
25 protected REToken next = null;
26 protected REToken uncle = null;
27 protected int subIndex;
29 protected REToken(int subIndex) {
30 this.subIndex = subIndex;
33 int getMinimumLength() {
37 void setUncle(REToken anUncle) {
41 /** Returns true if the match succeeded, false if it failed. */
42 abstract boolean match(CharIndexed input, REMatch mymatch);
44 /** Returns true if the rest of the tokens match, false if they fail. */
45 protected boolean next(CharIndexed input, REMatch mymatch) {
50 return uncle.match(input, mymatch);
53 return next.match(input, mymatch);
57 boolean chain(REToken token) {
59 return true; // Token was accepted
62 abstract void dump(StringBuffer os);
64 void dumpAll(StringBuffer os) {
66 if (next != null) next.dumpAll(os);