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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) 2002-2004 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"),
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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 /** Represents a while stetement. This could be the both versions:
40  *
41  * while &lt;condition&gt;
42  * &lt;body&gt;
43  * end
44  *
45  * and
46  *
47  * &lt;body&gt; 'while' &lt;condition&gt;
48  *
49  * @author jpetersen
50  */
51 public class WhileNode extends Node {
52     static final long serialVersionUID = -5355364190446060873L;
53
54     private final Node conditionNode;
55     private final Node bodyNode;
56     private final boolean evaluateAtStart;
57
58     public WhileNode(ISourcePosition position, Node conditionNode, Node bodyNode) {
59     this(position, conditionNode, bodyNode, true);
60     }
61
62     public WhileNode(ISourcePosition position, Node conditionNode, Node bodyNode,
63             boolean evalAtStart) {
64         super(position, NodeTypes.WHILENODE);
65         this.conditionNode = conditionNode;
66         this.bodyNode = bodyNode;
67         this.evaluateAtStart = evalAtStart;
68     }
69     
70     /**
71      * Accept for the visitor pattern.
72      * @param iVisitor the visitor
73      **/
74     public Instruction accept(NodeVisitor iVisitor) {
75         return iVisitor.visitWhileNode(this);
76     }
77     /**
78      * Gets the bodyNode.
79      * @return Returns a Node
80      */
81     public Node getBodyNode() {
82         return bodyNode;
83     }
84
85     /**
86      * Gets the conditionNode.
87      * @return Returns a Node
88      */
89     public Node getConditionNode() {
90         return conditionNode;
91     }
92     
93     /**
94      * Determine whether this is while or do while
95      * @return true if you are a while, false if do while
96      */
97     public boolean evaluateAtStart() {
98         return evaluateAtStart;
99     }
100
101     public List JavaDoc childNodes() {
102         return Node.createList(conditionNode, bodyNode);
103     }
104
105 }
106
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