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Common Lisp implementation running on the JVM
/*
* arglist.java
*
* Copyright (C) 2003-2005 Peter Graves
* $Id$
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* As a special exception, the copyright holders of this library give you
* permission to link this library with independent modules to produce an
* executable, regardless of the license terms of these independent
* modules, and to copy and distribute the resulting executable under
* terms of your choice, provided that you also meet, for each linked
* independent module, the terms and conditions of the license of that
* module. An independent module is a module which is not derived from
* or based on this library. If you modify this library, you may extend
* this exception to your version of the library, but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*/
package org.armedbear.lisp;
import static org.armedbear.lisp.Lisp.*;
public final class arglist
{
static final Operator getOperator(LispObject obj)
{
if (obj instanceof Operator)
return (Operator) obj;
if (obj instanceof Symbol) {
LispObject function = obj.getSymbolFunction();
if (function instanceof Autoload) {
Autoload autoload = (Autoload) function;
autoload.load();
function = autoload.getSymbol().getSymbolFunction();
}
if (function instanceof Operator) {
Operator operator = (Operator) function;
if (operator.getLambdaList() != null)
return operator;
LispObject other = get(obj, Symbol.MACROEXPAND_MACRO, null);
if (other != null)
return getOperator(other);
else
return null;
}
} else if (obj instanceof Cons && obj.car() == Symbol.LAMBDA)
return new Closure(obj, new Environment());
return null;
}
// ### arglist
private static final Primitive ARGLIST =
new Primitive("arglist", PACKAGE_EXT, true, "extended-function-designator")
{
@Override
public LispObject execute(LispObject arg)
{
LispThread thread = LispThread.currentThread();
Operator operator = getOperator(arg);
LispObject arglist = null;
if (operator != null)
arglist = operator.getLambdaList();
final LispObject value1, value2;
if (arglist instanceof AbstractString) {
String s = arglist.getStringValue();
// Give the string list syntax.
s = "(" + s + ")";
// Bind *PACKAGE* so we use the EXT package if we need
// to intern any symbols.
final SpecialBindingsMark mark = thread.markSpecialBindings();
thread.bindSpecial(Symbol._PACKAGE_, PACKAGE_EXT);
try {
arglist = readObjectFromString(s);
}
finally {
thread.resetSpecialBindings(mark);
}
operator.setLambdaList(arglist);
}
if (arglist != null) {
value1 = arglist;
value2 = T;
} else {
value1 = NIL;
value2 = NIL;
}
return thread.setValues(value1, value2);
}
};
// ### %set-arglist
private static final Primitive _SET_ARGLIST =
new Primitive("%set-arglist", PACKAGE_SYS, false)
{
@Override
public LispObject execute(LispObject first, LispObject second)
{
Operator operator = null;
if (first instanceof Operator) {
operator = (Operator) first;
} else if (first instanceof Symbol) {
LispObject function = first.getSymbolFunction();
if (function instanceof Operator)
operator = (Operator) function;
}
if (operator != null)
operator.setLambdaList(second);
return second;
}
};
}