01: /***** BEGIN LICENSE BLOCK *****
02: * Version: CPL 1.0/GPL 2.0/LGPL 2.1
03: *
04: * The contents of this file are subject to the Common Public
05: * License Version 1.0 (the "License"); you may not use this file
06: * except in compliance with the License. You may obtain a copy of
07: * the License at http://www.eclipse.org/legal/cpl-v10.html
08: *
09: * 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"),
21: * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
22: * in which case the provisions of the GPL or the LGPL are applicable instead
23: * of those above. If you wish to allow use of your version of this file only
24: * under the terms of either the GPL or the LGPL, and not to allow others to
25: * use your version of this file under the terms of the CPL, indicate your
26: * decision by deleting the provisions above and replace them with the notice
27: * and other provisions required by the GPL or the LGPL. If you do not delete
28: * the provisions above, a recipient may use your version of this file under
29: * the terms of any one of the CPL, the GPL or the LGPL.
30: ***** END LICENSE BLOCK *****/package org.jruby.ast;
31:
32: import java.util.List;
33:
34: import org.jruby.ast.visitor.NodeVisitor;
35: import org.jruby.evaluator.Instruction;
36: import org.jruby.lexer.yacc.ISourcePosition;
37:
38: /**
39: * Regexp backref.
40: * generated when one of the following special global variables are found
41: *
42: *
43: * - $& last succesfull match
44: *
45: * - $+ highest numbered group matched in last successful match.
46: *
47: * - $` what precedes the last successful match
48: *
49: * - $' what follows the last successful match
50: *
51: *
52: * @author jpetersen
53: */
54: public class BackRefNode extends Node {
55: static final long serialVersionUID = 5321267679438359590L;
56:
57: /**
58: * the character which generated the backreference
59: **/
60: private final char type;
61:
62: public BackRefNode(ISourcePosition position, char type) {
63: super (position, NodeTypes.BACKREFNODE);
64: this .type = type;
65: }
66:
67: /**
68: * Accept for the visitor pattern.
69: * @param iVisitor the visitor
70: **/
71: public Instruction accept(NodeVisitor iVisitor) {
72: return iVisitor.visitBackRefNode(this );
73: }
74:
75: /**
76: * Gets the type.
77: * the type is the character which generates the backreference
78: * @return type
79: */
80: public char getType() {
81: return type;
82: }
83:
84: public List childNodes() {
85: return EMPTY_LIST;
86: }
87:
88: }
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