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/*
 * StandardObjectFunctions.java
 *
 * Copyright (C) 2003-2005 Peter Graves
 * $Id: StandardObjectFunctions.java 13541 2011-08-27 23:23:24Z mevenson $
 *
 * 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 class StandardObjectFunctions
{
  private static final Primitive _STD_ALLOCATE_INSTANCE 
    = new pf__std_allocate_instance();
  @DocString(name="%std-allocate-instance",
             args="class",
             returns="instance")
  private static final class pf__std_allocate_instance extends Primitive
  {
    pf__std_allocate_instance()
    {
      super("%std-allocate-instance", PACKAGE_SYS, true, "class");
    }
    @Override
    public LispObject execute(LispObject arg)
    {
      if (arg == StandardClass.STANDARD_CLASS)
        return new StandardClass();
      if (arg instanceof StandardClass)
        return ((StandardClass)arg).allocateInstance();
      if (arg.typep(StandardClass.STANDARD_CLASS) != NIL) {
        LispObject l = Symbol.CLASS_LAYOUT.execute(arg);
        if (! (l instanceof Layout))
          return error(new ProgramError("Invalid standard class layout for: " + arg.princToString()));
        
        return new StandardObject((Layout)l);
      }
      return type_error(arg, Symbol.STANDARD_CLASS);
    }
  };
}