1 | /* |
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2 | * lognand.java |
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3 | * |
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4 | * Copyright (C) 2003-2004 Peter Graves |
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5 | * $Id: lognand.java 14466 2013-04-24 12:50:40Z rschlatte $ |
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6 | * |
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7 | * This program is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU General Public License |
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9 | * as published by the Free Software Foundation; either version 2 |
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10 | * of the License, or (at your option) any later version. |
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11 | * |
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12 | * This program is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | * GNU General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU General Public License |
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18 | * along with this program; if not, write to the Free Software |
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19 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 | * |
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21 | * As a special exception, the copyright holders of this library give you |
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22 | * permission to link this library with independent modules to produce an |
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23 | * executable, regardless of the license terms of these independent |
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24 | * modules, and to copy and distribute the resulting executable under |
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25 | * terms of your choice, provided that you also meet, for each linked |
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26 | * independent module, the terms and conditions of the license of that |
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27 | * module. An independent module is a module which is not derived from |
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28 | * or based on this library. If you modify this library, you may extend |
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29 | * this exception to your version of the library, but you are not |
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30 | * obligated to do so. If you do not wish to do so, delete this |
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31 | * exception statement from your version. |
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32 | */ |
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33 | |
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34 | package org.armedbear.lisp; |
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35 | |
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36 | import static org.armedbear.lisp.Lisp.*; |
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37 | |
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38 | import java.math.BigInteger; |
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39 | |
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40 | public final class lognand extends Primitive |
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41 | { |
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42 | private lognand() |
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43 | { |
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44 | super("lognand", "integer-1 integer-2"); |
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45 | } |
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46 | |
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47 | @Override |
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48 | public LispObject execute(LispObject first, LispObject second) |
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49 | |
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50 | { |
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51 | if (first instanceof Fixnum) { |
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52 | if (second instanceof Fixnum) |
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53 | return Fixnum.getInstance(~(((Fixnum)first).value & |
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54 | ((Fixnum)second).value)); |
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55 | if (second instanceof Bignum) { |
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56 | BigInteger n1 = ((Fixnum)first).getBigInteger(); |
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57 | BigInteger n2 = ((Bignum)second).value; |
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58 | return number(n1.and(n2).not()); |
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59 | } |
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60 | return type_error(second, Symbol.INTEGER); |
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61 | } |
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62 | if (first instanceof Bignum) { |
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63 | BigInteger n1 = ((Bignum)first).value; |
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64 | if (second instanceof Fixnum) { |
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65 | BigInteger n2 = ((Fixnum)second).getBigInteger(); |
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66 | return number(n1.and(n2).not()); |
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67 | } |
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68 | if (second instanceof Bignum) { |
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69 | BigInteger n2 = ((Bignum)second).value; |
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70 | return number(n1.and(n2).not()); |
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71 | } |
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72 | return type_error(second, Symbol.INTEGER); |
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73 | } |
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74 | return type_error(first, Symbol.INTEGER); |
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75 | } |
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76 | |
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77 | private static final Primitive LOGNAND = new lognand(); |
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78 | } |
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