1 | /* |
---|
2 | * logeqv.java |
---|
3 | * |
---|
4 | * Copyright (C) 2003-2005 Peter Graves |
---|
5 | * $Id: logeqv.java 14466 2013-04-24 12:50:40Z rschlatte $ |
---|
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 | * As a special exception, the copyright holders of this library give you |
---|
22 | * permission to link this library with independent modules to produce an |
---|
23 | * executable, regardless of the license terms of these independent |
---|
24 | * modules, and to copy and distribute the resulting executable under |
---|
25 | * terms of your choice, provided that you also meet, for each linked |
---|
26 | * independent module, the terms and conditions of the license of that |
---|
27 | * module. An independent module is a module which is not derived from |
---|
28 | * or based on this library. If you modify this library, you may extend |
---|
29 | * this exception to your version of the library, but you are not |
---|
30 | * obligated to do so. If you do not wish to do so, delete this |
---|
31 | * exception statement from your version. |
---|
32 | */ |
---|
33 | |
---|
34 | package org.armedbear.lisp; |
---|
35 | |
---|
36 | import static org.armedbear.lisp.Lisp.*; |
---|
37 | |
---|
38 | import java.math.BigInteger; |
---|
39 | |
---|
40 | // ### logeqv |
---|
41 | // logeqv &rest integers => result-integer |
---|
42 | // equivalence (exclusive nor) |
---|
43 | public final class logeqv extends Primitive |
---|
44 | { |
---|
45 | private logeqv() |
---|
46 | { |
---|
47 | super("logeqv", "&rest integers"); |
---|
48 | } |
---|
49 | |
---|
50 | @Override |
---|
51 | public LispObject execute() |
---|
52 | { |
---|
53 | return Fixnum.MINUS_ONE; |
---|
54 | } |
---|
55 | |
---|
56 | @Override |
---|
57 | public LispObject execute(LispObject arg) |
---|
58 | { |
---|
59 | if (arg instanceof Fixnum) |
---|
60 | return arg; |
---|
61 | if (arg instanceof Bignum) |
---|
62 | return arg; |
---|
63 | return type_error(arg, Symbol.INTEGER); |
---|
64 | } |
---|
65 | |
---|
66 | @Override |
---|
67 | public LispObject execute(LispObject[] args) |
---|
68 | { |
---|
69 | BigInteger result = null; |
---|
70 | for (int i = 0; i < args.length; i++) { |
---|
71 | LispObject arg = args[i]; |
---|
72 | BigInteger n; |
---|
73 | if (arg instanceof Fixnum) |
---|
74 | n = ((Fixnum)arg).getBigInteger(); |
---|
75 | else if (arg instanceof Bignum) |
---|
76 | n = ((Bignum)arg).value; |
---|
77 | else |
---|
78 | return type_error(arg, Symbol.INTEGER); |
---|
79 | if (result == null) |
---|
80 | result = n; |
---|
81 | else |
---|
82 | result = result.xor(n).not(); |
---|
83 | } |
---|
84 | return number(result); |
---|
85 | } |
---|
86 | |
---|
87 | private static final Primitive LOGEQV = new logeqv(); |
---|
88 | } |
---|