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Java > Open Source Codes > org > armedbear > lisp > get_properties


1 /*
2  * get_properties.java
3  *
4  * Copyright (C) 2003-2004 Peter Graves
5  * $Id: get_properties.java,v 1.3 2004/03/17 18:06:47 piso Exp $
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
22 package org.armedbear.lisp;
23
24 // ### get-properties
25
public final class get_properties extends Primitive2
26 {
27     private get_properties()
28     {
29         super("get-properties", "plist indicator-list");
30     }
31
32     public LispObject execute(LispObject first, LispObject second)
33         throws ConditionThrowable
34     {
35         final LispThread thread = LispThread.currentThread();
36         LispObject plist = first;
37         while (plist != NIL) {
38             if (plist.cdr().atom())
39                 return signal(new TypeError("Malformed property list: " + first + "."));
40             LispObject indicator = plist.car();
41             LispObject indicators = second;
42             while (indicators instanceof Cons) {
43                 if (indicator == indicators.car())
44                     return thread.setValues(indicator, plist.cadr(), plist);
45                 indicators = indicators.cdr();
46             }
47             if (indicators != NIL)
48                 signal(new TypeError(String.valueOf(second) + " is not a proper list."));
49             plist = plist.cddr();
50         }
51         return thread.setValues(NIL, NIL, NIL);
52     }
53
54     private static final get_properties GET_PROPERTIES = new get_properties();
55 }
56
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