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1
29 package org.jruby.ast;
30
31 import java.util.ArrayList  ;
32 import java.util.Iterator ;
33 import java.util.List ;
34 import java.util.ListIterator ;
35
36 import org.jruby.ast.visitor.NodeVisitor;
37 import org.jruby.evaluator.Instruction;
38 import org.jruby.lexer.yacc.ISourcePosition;
39
40
46 public class ListNode extends Node {
47 private static final long serialVersionUID = 1L;
48
49 private List list = null;
50
51
57 public ListNode(ISourcePosition position, int id, Node firstNode) {
58 this(position, id);
59
60 add(firstNode);
61 }
62
63 public ListNode(ISourcePosition position, int id) {
64 super(position, id);
65 }
66
67 public ListNode(ISourcePosition position) {
68 super(position, NodeTypes.LISTNODE);
69 }
70
71 public ListNode add(Node node) {
72 if (node == null) return this;
74 if (list == null) list = new ArrayList ();
75
76 list.add(node);
77 setPosition(getPosition().union(node.getPosition()));
78 return this;
79 }
80
81 public Iterator iterator() {
82 return list == null ? EMPTY_LIST.iterator() : list.iterator();
83 }
84
85 public ListIterator reverseIterator() {
86 return list == null ? EMPTY_LIST.listIterator() : list.listIterator(list.size());
87 }
88
89 public int size() {
90 return list == null ? 0 : list.size();
91 }
92
93
94
100 public ListNode addAll(ListNode other) {
101 if (other != null) {
102 if (list == null) list = new ArrayList ();
103 list.addAll(other.list);
104
105 if (list.size() > 0) {
106 setPosition(getPosition().union(getLast().getPosition()));
107 }
108 }
109 return this;
110 }
111
112
118 public ListNode addAll(Node other) {
119 return add(other);
120 }
121
122 public Node getLast() {
123 return list == null ? null : (Node) list.get(list.size() - 1);
124 }
125
126 public String toString() {
127 String string = super.toString();
128 if (list == null) {
129 return string + ": {}";
130 }
131 StringBuffer b = new StringBuffer ();
132 for (int i = 0; i < list.size(); i++) {
133 b.append(list.get(i));
134 if (i + 1 < list.size()) {
135 b.append(", ");
136 }
137 }
138 return string + ": {" + b.toString() + "}";
139 }
140
141 public List childNodes() {
142 return list == null ? EMPTY_LIST : list;
143 }
144
145 public Instruction accept(NodeVisitor visitor) {
146 throw new RuntimeException ("Base class ListNode should never be evaluated");
147 }
148
149 public Node get(int idx) {
150 return (Node)list.get(idx);
151 }
152 }
153 |
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