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Java > Open Source Codes > org > armedbear > lisp > logorc2


1 /*
2  * logorc2.java
3  *
4  * Copyright (C) 2003-2004 Peter Graves
5  * $Id: logorc2.java,v 1.6 2004/02/28 17:48:16 piso Exp $
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 (at your option) 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, Boston, MA 02111-1307, USA.
20  */

21
22 package org.armedbear.lisp;
23
24 import java.math.BigInteger JavaDoc;
25
26 // ### logorc2
27
// logorc2 integer-1 integer-2 => result-integer
28
// or integer-1 with complement of integer-2
29
public final class logorc2 extends Primitive2
30 {
31     private logorc2()
32     {
33         super("logorc2", "integer-1 integer-2");
34     }
35
36     public LispObject execute(LispObject first, LispObject second)
37         throws ConditionThrowable
38     {
39         if (first instanceof Fixnum) {
40             if (second instanceof Fixnum)
41                 return new Fixnum(((Fixnum)first).value |
42                                   ~((Fixnum)second).value);
43             if (second instanceof Bignum) {
44                 BigInteger JavaDoc n1 = ((Fixnum)first).getBigInteger();
45                 BigInteger JavaDoc n2 = ((Bignum)second).value;
46                 return number(n1.or(n2.not()));
47             }
48             return signal(new TypeError(second, Symbol.INTEGER));
49         }
50         if (first instanceof Bignum) {
51             BigInteger JavaDoc n1 = ((Bignum)first).value;
52             if (second instanceof Fixnum) {
53                 BigInteger JavaDoc n2 = ((Fixnum)second).getBigInteger();
54                 return number(n1.or(n2.not()));
55             }
56             if (second instanceof Bignum) {
57                 BigInteger JavaDoc n2 = ((Bignum)second).value;
58                 return number(n1.or(n2.not()));
59             }
60             return signal(new TypeError(second, Symbol.INTEGER));
61         }
62         return signal(new TypeError(first, Symbol.INTEGER));
63     }
64
65     private static final Primitive2 LOGORC2 = new logorc2();
66 }
67
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