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/interpreter/tags/at2-build190607/src/edu/vub/util/regexp/REToken.java

http://ambienttalk.googlecode.com/
Java | 99 lines | 48 code | 13 blank | 38 comment | 8 complexity | 3642c91d8e9bc4102ec572f4e4bcd1f8 MD5 | raw file
 1/* gnu/regexp/REToken.java
 2   Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
 3
 4This file is part of GNU Classpath.
 5
 6GNU Classpath is free software; you can redistribute it and/or modify
 7it under the terms of the GNU General Public License as published by
 8the Free Software Foundation; either version 2, or (at your option)
 9any later version.
10
11GNU Classpath is distributed in the hope that it will be useful, but
12WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with GNU Classpath; see the file COPYING.  If not, write to the
18Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
1902110-1301 USA.
20
21Linking this library statically or dynamically with other modules is
22making a combined work based on this library.  Thus, the terms and
23conditions of the GNU General Public License cover the whole
24combination.
25
26As a special exception, the copyright holders of this library give you
27permission to link this library with independent modules to produce an
28executable, regardless of the license terms of these independent
29modules, and to copy and distribute the resulting executable under
30terms of your choice, provided that you also meet, for each linked
31independent module, the terms and conditions of the license of that
32module.  An independent module is a module which is not derived from
33or based on this library.  If you modify this library, you may extend
34this exception to your version of the library, but you are not
35obligated to do so.  If you do not wish to do so, delete this
36exception statement from your version. */
37
38package edu.vub.util.regexp;
39import java.io.Serializable;
40
41abstract class REToken implements Serializable, Cloneable {
42
43  protected REToken next = null;
44  protected REToken uncle = null;
45  protected int subIndex;
46
47  public Object clone() {
48    try {
49      REToken copy = (REToken) super.clone();
50      return copy;
51    } catch (CloneNotSupportedException e) {
52      throw new Error(); // doesn't happen
53    }
54  }
55
56  protected REToken(int subIndex) {
57      this.subIndex = subIndex;
58  }
59
60  int getMinimumLength() {
61    return 0;
62  }
63
64  int getMaximumLength() {
65    return Integer.MAX_VALUE;
66  }
67
68  void setUncle(REToken anUncle) {
69    uncle = anUncle;
70  }
71
72    /** Returns true if the match succeeded, false if it failed. */
73    abstract boolean match(CharIndexed input, REMatch mymatch);
74  
75    /** Returns true if the rest of the tokens match, false if they fail. */
76    protected boolean next(CharIndexed input, REMatch mymatch) {
77	if (next == null) {
78	    if (uncle == null) {
79		return true;
80	    } else {
81		return uncle.match(input, mymatch);
82	    }
83	} else {
84	    return next.match(input, mymatch);
85	}
86    }
87  
88  boolean chain(REToken token) {
89      next = token;
90      return true; // Token was accepted
91  }
92
93    abstract void dump(StringBuffer os);
94
95  void dumpAll(StringBuffer os) {
96    dump(os);
97    if (next != null) next.dumpAll(os);
98  }
99}