1 /* gnu/regexp/REToken.java
2 Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
4 This file is part of GNU Classpath.
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING. If not, write to the
18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library. Thus, the terms and
23 conditions of the GNU General Public License cover the whole
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module. An independent module is a module which is not derived from
33 or based on this library. If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so. If you do not wish to do so, delete this
36 exception statement from your version. */
39 import java
.io
.Serializable
;
41 abstract class REToken
implements Serializable
, Cloneable
{
43 protected REToken next
= null;
44 protected REToken uncle
= null;
45 protected int subIndex
;
47 public Object
clone() {
49 REToken copy
= (REToken
) super.clone();
51 } catch (CloneNotSupportedException e
) {
52 throw new Error(); // doesn't happen
56 protected REToken(int subIndex
) {
57 this.subIndex
= subIndex
;
60 int getMinimumLength() {
64 int getMaximumLength() {
65 return Integer
.MAX_VALUE
;
68 void setUncle(REToken anUncle
) {
72 /** Returns true if the match succeeded, false if it failed. */
73 abstract boolean match(CharIndexed input
, REMatch mymatch
);
75 /** Returns true if the rest of the tokens match, false if they fail. */
76 protected boolean next(CharIndexed input
, REMatch mymatch
) {
81 return uncle
.match(input
, mymatch
);
84 return next
.match(input
, mymatch
);
88 boolean chain(REToken token
) {
90 return true; // Token was accepted
93 abstract void dump(StringBuffer os
);
95 void dumpAll(StringBuffer os
) {
97 if (next
!= null) next
.dumpAll(os
);