1 /*
2  * assql.java
3  *
4  * Copyright (C) 2003-2005 Peter Graves
5  * $Id$
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 // ### assql item alist => entry
39 public final class assql extends Primitive
40 {
assql()41     private assql()
42     {
43         super("assql", PACKAGE_EXT);
44     }
45 
46     @Override
execute(LispObject item, LispObject alist)47     public LispObject execute(LispObject item, LispObject alist)
48 
49     {
50         while (alist != NIL) {
51             LispObject cons = alist.car();
52             if (cons instanceof Cons) {
53                 if (cons.car().eql(item))
54                     return cons;
55             } else if (cons != NIL)
56                 return type_error(cons, Symbol.LIST);
57             alist = alist.cdr();
58         }
59         return NIL;
60     }
61 
62     private static final Primitive ASSQL = new assql();
63 }
64