Source code: org/jext/dawn/stack/ReverseFunction.java
1 /*
2 * ReverseFunction.java - reverse command
3 * Copyright (C) 2000 Romain Guy
4 * romain.guy@jext.org
5 * http://www.jext.org
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, BoReversen, MA 02111-1307, USA.
20 */
21
22 package org.jext.dawn.stack;
23
24 import java.util.Stack;
25 import org.jext.dawn.*;
26
27 /**
28 * Reverses the stack.<br>
29 * Usage:<br>
30 * <code>rev</code>
31 * @author Romain Guy
32 */
33
34 public class ReverseFunction extends Function
35 {
36 public ReverseFunction()
37 {
38 super("rev");
39 }
40
41 public void invoke(DawnParser parser) throws DawnRuntimeException
42 {
43 parser.checkEmpty(this);
44 Stack stack = parser.getStack();
45 Object[] datas = new Object[stack.size()];
46 for (int i = 0; i < datas.length; i++)
47 datas[i] = stack.elementAt(datas.length - 1 - i);
48 stack.removeAllElements();
49 for (int i = 0; i < datas.length; i++)
50 stack.addElement(datas[i]);
51 }
52 }
53
54 // End of ReverseFunction.java