01: /*
02: * UnboundVariable.java
03: *
04: * Copyright (C) 2002-2004 Peter Graves
05: * $Id: UnboundVariable.java,v 1.9 2004/09/20 18:43:43 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: public final class UnboundVariable extends CellError {
25: // obj is either the unbound variable itself or an initArgs list.
26: public UnboundVariable(LispObject obj) throws ConditionThrowable {
27: super (obj instanceof Cons ? obj : list2(Keyword.NAME, obj));
28: }
29:
30: public String getMessage() {
31: LispThread thread = LispThread.currentThread();
32: Environment oldDynEnv = thread.getDynamicEnvironment();
33: thread.bindSpecial(_PRINT_ESCAPE_, T);
34: StringBuffer sb = new StringBuffer("The variable ");
35: // FIXME
36: try {
37: sb.append(getCellName().writeToString());
38: } catch (Throwable t) {
39: }
40: sb.append(" is unbound.");
41: thread.setDynamicEnvironment(oldDynEnv);
42: return sb.toString();
43: }
44:
45: public LispObject typeOf() {
46: return Symbol.UNBOUND_VARIABLE;
47: }
48:
49: public LispClass classOf() {
50: return BuiltInClass.UNBOUND_VARIABLE;
51: }
52:
53: public LispObject typep(LispObject type) throws ConditionThrowable {
54: if (type == Symbol.UNBOUND_VARIABLE)
55: return T;
56: if (type == BuiltInClass.UNBOUND_VARIABLE)
57: return T;
58: return super.typep(type);
59: }
60: }
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