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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 "MLKCons.h"

#import <Foundation/NSString.h>


@implementation MLKCons
+(MLKCons*) cons:(id)car with:(id)cdr
{
  return AUTORELEASE ([[MLKCons alloc] initWithCar:car cdr:cdr]);
}

-(MLKCons*) initWithCar:(id)car cdr:(id)cdr
{
  self = [super init];
  ASSIGN (_car, car);
  ASSIGN (_cdr, cdr);
  return self;
}


-(id) car
{
  return _car;
}

-(id) cdr
{
  return _cdr;
}

-(void) setCar:(id)value
{
  ASSIGN (_car, value);
}

-(void) setCdr:(id)value
{
  ASSIGN (_cdr, value);
}

-(NSString *)bareDescriptionForLisp
{
  if (!_cdr)
    return [NSString stringWithFormat:@"%@", [_car descriptionForLisp]];
  else if ([_cdr isKindOfClass:[MLKCons class]])
    return [NSString stringWithFormat:@"%@ %@",
                     [_car descriptionForLisp],
                     [_cdr bareDescriptionForLisp]];
  else
    return [NSString stringWithFormat:@"%@ . %@",
                     [_car descriptionForLisp],
                     [_cdr descriptionForLisp]];
}

-(NSString *)descriptionForLisp
{
  return [NSString stringWithFormat:@"(%@)", [self bareDescriptionForLisp]];
}

-(void) dealloc
{
  RELEASE (_car);
  RELEASE (_cdr);
  [super dealloc];
}
@end