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Java > Open Source Codes > org > apache > oro > text > awk > OrNode


1 package org.apache.oro.text.awk;
2
3 /* ====================================================================
4  * The Apache Software License, Version 1.1
5  *
6  * Copyright (c) 2000 The Apache Software Foundation. All rights
7  * reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
15  *
16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in
18  * the documentation and/or other materials provided with the
19  * distribution.
20  *
21  * 3. The end-user documentation included with the redistribution,
22  * if any, must include the following acknowledgment:
23  * "This product includes software developed by the
24  * Apache Software Foundation (http://www.apache.org/)."
25  * Alternately, this acknowledgment may appear in the software itself,
26  * if and wherever such third-party acknowledgments normally appear.
27  *
28  * 4. The names "Apache" and "Apache Software Foundation", "Jakarta-Oro"
29  * must not be used to endorse or promote products derived from this
30  * software without prior written permission. For written
31  * permission, please contact apache@apache.org.
32  *
33  * 5. Products derived from this software may not be called "Apache"
34  * or "Jakarta-Oro", nor may "Apache" or "Jakarta-Oro" appear in their
35  * name, without prior written permission of the Apache Software Foundation.
36  *
37  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40  * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48  * SUCH DAMAGE.
49  * ====================================================================
50  *
51  * This software consists of voluntary contributions made by many
52  * individuals on behalf of the Apache Software Foundation. For more
53  * information on the Apache Software Foundation, please see
54  * <http://www.apache.org/>.
55  *
56  * Portions of this software are based upon software originally written
57  * by Daniel F. Savarese. We appreciate his contributions.
58  */
59
60 import java.util.*;
61
62 /**
63  @author <a HREF="dfs@savarese.org">Daniel F. Savarese</a>
64  @version $Id: OrNode.java,v 1.1.1.1 2000/07/23 23:08:50 jon Exp $
65  */
66 class OrNode extends SyntaxNode {
67   SyntaxNode _left, _right;
68
69   OrNode(SyntaxNode left, SyntaxNode right) {
70     _left = left;
71     _right = right;
72   }
73
74   boolean _nullable() {
75     return (_left._nullable() || _right._nullable());
76   }
77
78   BitSet _firstPosition() {
79     BitSet ls, rs, bs;
80
81     ls = _left._firstPosition();
82     rs = _right._firstPosition();
83     bs = new BitSet(Math.max(ls.size(), rs.size()));
84     bs.or(rs);
85     bs.or(ls);
86
87     return bs;
88   }
89
90   BitSet _lastPosition() {
91     BitSet ls, rs, bs;
92
93     ls = _left._lastPosition();
94     rs = _right._lastPosition();
95     bs = new BitSet(Math.max(ls.size(), rs.size()));
96     bs.or(rs);
97     bs.or(ls);
98
99     return bs;
100   }
101
102   void _followPosition(BitSet[] follow, SyntaxNode[] nodes) {
103     _left._followPosition(follow, nodes);
104     _right._followPosition(follow, nodes);
105   }
106
107   SyntaxNode _clone(int pos[]) {
108     return new OrNode(_left._clone(pos), _right._clone(pos));
109   }
110 }
111
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