/*
 * Copyright 2009 Yuichiro Moriguchi
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.morilib.lisp.nano.subr;

import net.morilib.lisp.nano.Datum;
import net.morilib.lisp.nano.Environment;
import net.morilib.lisp.nano.LispMessage;
import net.morilib.lisp.nano.Nil;
import net.morilib.lisp.nano.OutputPort;
import net.morilib.lisp.nano.Subr;


public class CurrentOutputPort extends Subr {

	@Override
	public Datum eval(Datum body, Environment env, LispMessage mesg) {
		if(body != Nil.NIL) {
			throw mesg.getError("err.argument", "current-output-port");
			//throw new LispException("bad argument");
		}
		
		//return OutputPort.STANDARD;
		return OutputPort.getStandard(mesg);
	}

}
