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Java > Open Source Codes > org > jruby > ast > BackRefNode


1 /***** BEGIN LICENSE BLOCK *****
2  * Version: CPL 1.0/GPL 2.0/LGPL 2.1
3  *
4  * The contents of this file are subject to the Common Public
5  * License Version 1.0 (the "License"); you may not use this file
6  * except in compliance with the License. You may obtain a copy of
7  * the License at http://www.eclipse.org/legal/cpl-v10.html
8  *
9  * Software distributed under the License is distributed on an "AS
10  * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
11  * implied. See the License for the specific language governing
12  * rights and limitations under the License.
13  *
14  * Copyright (C) 2001-2002 Jan Arne Petersen <jpetersen@uni-bonn.de>
15  * Copyright (C) 2001-2002 Benoit Cerrina <b.cerrina@wanadoo.fr>
16  * Copyright (C) 2002 Anders Bengtsson <ndrsbngtssn@yahoo.se>
17  * Copyright (C) 2004 Thomas E Enebo <enebo@acm.org>
18  *
19  * Alternatively, the contents of this file may be used under the terms of
20  * either of the GNU General Public License Version 2 or later (the "GPL"),
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30  ***** END LICENSE BLOCK *****/
31 package org.jruby.ast;
32
33 import java.util.List JavaDoc;
34
35 import org.jruby.ast.visitor.NodeVisitor;
36 import org.jruby.evaluator.Instruction;
37 import org.jruby.lexer.yacc.ISourcePosition;
38
39 /**
40  * Regexp backref.
41  * generated when one of the following special global variables are found
42  *
43  *
44  * - $&amp; last succesfull match
45  *
46  * - $+ highest numbered group matched in last successful match.
47  *
48  * - $` what precedes the last successful match
49  *
50  * - $' what follows the last successful match
51  *
52  *
53  * @author jpetersen
54  */
55 public class BackRefNode extends Node {
56     static final long serialVersionUID = 5321267679438359590L;
57
58     /**
59      * the character which generated the backreference
60      **/
61     private final char type;
62
63     public BackRefNode(ISourcePosition position, char type) {
64         super(position, NodeTypes.BACKREFNODE);
65         this.type = type;
66     }
67
68     /**
69      * Accept for the visitor pattern.
70      * @param iVisitor the visitor
71      **/
72     public Instruction accept(NodeVisitor iVisitor) {
73         return iVisitor.visitBackRefNode(this);
74     }
75
76     /**
77      * Gets the type.
78      * the type is the character which generates the backreference
79      * @return type
80      */
81     public char getType() {
82         return type;
83     }
84     
85     public List JavaDoc childNodes() {
86         return EMPTY_LIST;
87     }
88
89 }
90
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