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


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.
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10  * modification, are permitted provided that the following conditions
11  * are met:
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14  * notice, this list of conditions and the following disclaimer.
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16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in
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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"
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30  * software without prior written permission. For written
31  * permission, please contact apache@apache.org.
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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.
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37  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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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,
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55  *
56  * Portions of this software are based upon software originally written
57  * by Daniel F. Savarese. We appreciate his contributions.
58  */
59
60
61 import java.util.*;
62
63 /**
64  @author <a HREF="dfs@savarese.org">Daniel F. Savarese</a>
65  @version $Id: SyntaxNode.java,v 1.1.1.1 2000/07/23 23:08:50 jon Exp $
66  */
67 abstract class SyntaxNode {
68   abstract boolean _nullable();
69   abstract BitSet _firstPosition();
70   abstract BitSet _lastPosition();
71   abstract void _followPosition(BitSet[] follow, SyntaxNode[] nodes);
72
73   /**
74    * This method is designed specifically to accommodate the expansion of
75    * an interval into its subparts.
76    * <p>
77    * @param pos A single element array containing a variable representing
78    * the current position. It is made an array to cause it
79    * to be passed by reference to allow incrementing.
80    */
81   abstract SyntaxNode _clone(int pos[]);
82 }
83
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