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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) 2004-2006 Thomas E Enebo <enebo@acm.org>
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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.internal.runtime.methods.EvaluateCallable;
38 import org.jruby.lexer.yacc.ISourcePosition;
39 import org.jruby.parser.StaticScope;
40 import org.jruby.runtime.ICallable;
41 import org.jruby.runtime.NilCallable;
42
43 /**
44  * Represents a block.
45  *
46  */
47 public class IterNode extends Node {
48     static final long serialVersionUID = -9181965000180892184L;
49
50     private final Node varNode;
51     private final Node bodyNode;
52     
53     // What static scoping relationship exists when it comes into being.
54 private StaticScope scope;
55     
56     private transient ICallable callable;
57
58     public IterNode(ISourcePosition position, Node varNode, StaticScope scope, Node bodyNode) {
59         this(position, varNode, scope, bodyNode, NodeTypes.ITERNODE);
60     }
61     
62     public IterNode(ISourcePosition position, Node varNode, StaticScope scope, Node bodyNode,
63             int id) {
64         super(position, id);
65         this.varNode = varNode;
66         this.scope = scope;
67         this.bodyNode = bodyNode;
68         
69         // if body and var are null, don't both with a heavyweight callable
70 if (bodyNode == null && varNode == null) {
71             callable = NilCallable.NIL_CALLABLE;
72         }
73     }
74
75     /**
76      * Accept for the visitor pattern.
77      * @param iVisitor the visitor
78      **/
79     public Instruction accept(NodeVisitor iVisitor) {
80         return iVisitor.visitIterNode(this);
81     }
82     
83     public StaticScope getScope() {
84         return scope;
85     }
86
87     /**
88      * Gets the bodyNode.
89      * @return Returns a Node
90      */
91     public Node getBodyNode() {
92         return bodyNode;
93     }
94
95     /**
96      * Gets the varNode.
97      * @return Returns a Node
98      */
99     public Node getVarNode() {
100         return varNode;
101     }
102     
103     public List JavaDoc childNodes() {
104         return Node.createList(varNode, bodyNode);
105     }
106
107     public ICallable getCallable() {
108         if (callable == null) {
109             callable = new EvaluateCallable(bodyNode, varNode);
110         }
111         
112         return callable;
113     }
114 }
115
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