org.armedbear.lisp.ceiling Maven / Gradle / Ivy
/*
* ceiling.java
*
* Copyright (C) 2004 Peter Graves
* $Id$
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* As a special exception, the copyright holders of this library give you
* permission to link this library with independent modules to produce an
* executable, regardless of the license terms of these independent
* modules, and to copy and distribute the resulting executable under
* terms of your choice, provided that you also meet, for each linked
* independent module, the terms and conditions of the license of that
* module. An independent module is a module which is not derived from
* or based on this library. If you modify this library, you may extend
* this exception to your version of the library, but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*/
package org.armedbear.lisp;
// ### ceiling number &optional divisor
public final class ceiling extends Primitive
{
private ceiling()
{
super("ceiling", "number &optional divisor");
}
@Override
public LispObject execute(LispObject arg)
{
return execute(arg, Fixnum.ONE);
}
@Override
public LispObject execute(LispObject first, LispObject second)
{
LispObject quotient = first.truncate(second);
final LispThread thread = LispThread.currentThread();
LispObject remainder = thread._values[1];
if (remainder.zerop())
return quotient;
if (second.minusp()) {
if (first.plusp())
return quotient;
} else {
if (first.minusp())
return quotient;
}
quotient = quotient.incr();
thread._values[0] = quotient;
thread._values[1] = remainder.subtract(second);
return quotient;
}
private static final Primitive CEILING = new ceiling();
}