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/* -*- mode: objc; coding: utf-8 -*- */
/* Étoilisp/Mulklisp, a Common Lisp subset for the Étoilé runtime.
* Copyright (C) 2008 Matthias Andreas Benkard.
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#import "functions.h"
#import "MLKInteger.h"
NSString *MLKPrintToString (id object)
{
if (object == nil)
return @"()";
else if (MLKInstanceP (object))
return [object descriptionForLisp];
else if (MLKFixnumP (object))
return MLKPrintToString ([MLKInteger
integerWithIntptr_t:(MLKIntWithFixnum (object))]);
else
{
NSLog (@"MLKPrintToString: Encountered a really weird object at address %p",
object);
return @"<??\?>";
}
}
intptr_t MLKIntWithFixnum (id fixnum)
{
return ((intptr_t)fixnum >> 1);
}
id MLKFixnumWithInt (intptr_t value)
{
return (id)((value << 1) | 1);
}
id MLKIntegerWithInt (intptr_t value)
{
#ifndef NO_FIXNUMS
intptr_t maybeFixnum = (value << 1) | 1;
if (value == (maybeFixnum >> 1))
return (id)maybeFixnum;
else
#endif
return [MLKInteger integerWithIntptr_t:value];
}
BOOL MLKFixnumP (id thing)
{
return ((intptr_t)thing & 1);
}
BOOL MLKInstanceP (id thing)
{
return !((intptr_t)thing & 1);
}
id MLKCanoniseInteger (MLKInteger *x)
{
if (MLKFixnumP (x))
{
return x;
}
else if (MLKInstanceP (x))
{
if ([x fitsIntoFixnum])
return [x fixnumValue];
else
return x;
}
else
{
NSLog (@"MLKCanoniseInteger: Encountered a really weird object at address %p",
x);
return 0;
}
}
id MLKAddFixnums (id x, id y)
{
intptr_t ix = MLKIntWithFixnum (x);
intptr_t iy = MLKIntWithFixnum (y);
intptr_t result = ix + iy;
return MLKIntegerWithInt (result);
}
id MLKSubtractFixnums (id x, id y)
{
intptr_t ix = MLKIntWithFixnum (x);
intptr_t iy = MLKIntWithFixnum (y);
intptr_t result = ix - iy;
return MLKIntegerWithInt (result);
}
id MLKIDivideFixnums (id x, id y)
{
intptr_t ix = MLKIntWithFixnum (x);
intptr_t iy = MLKIntWithFixnum (y);
intptr_t result = ix / iy;
return MLKIntegerWithInt (result);
}
id MLKMultiplyFixnums (id x, id y)
{
id ix = [MLKInteger integerWithFixnum:x];
id iy = [MLKInteger integerWithFixnum:y];
id result = [ix multiplyWith:iy];
return MLKCanoniseInteger (result);
}
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