01: /*
02: * get_properties.java
03: *
04: * Copyright (C) 2003-2004 Peter Graves
05: * $Id: get_properties.java,v 1.3 2004/03/17 18:06:47 piso Exp $
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License
09: * 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: private get_properties() {
27: super ("get-properties", "plist indicator-list");
28: }
29:
30: public LispObject execute(LispObject first, LispObject second)
31: throws ConditionThrowable {
32: final LispThread thread = LispThread.currentThread();
33: LispObject plist = first;
34: while (plist != NIL) {
35: if (plist.cdr().atom())
36: return signal(new TypeError("Malformed property list: "
37: + first + "."));
38: LispObject indicator = plist.car();
39: LispObject indicators = second;
40: while (indicators instanceof Cons) {
41: if (indicator == indicators.car())
42: return thread.setValues(indicator, plist.cadr(),
43: plist);
44: indicators = indicators.cdr();
45: }
46: if (indicators != NIL)
47: signal(new TypeError(String.valueOf(second)
48: + " 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: }
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