/*
 * 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.subr;

import net.morilib.lisp.Datum;
import net.morilib.lisp.Environment;
import net.morilib.lisp.LispComplex;
import net.morilib.lisp.LispMath;
import net.morilib.lisp.LispMessage;
import net.morilib.lisp.math.angle.ILispAngle;

/**
 * 
 *
 *
 * @author MORIGUCHI, Yuichiro 2009
 */
public class Tan extends UnaryArgs {

	@Override
	protected Datum execute(Datum c1a, Environment env,
			LispMessage mesg) {
		if(c1a instanceof LispComplex) {
			return LispMath.tan((LispComplex)c1a);
		} else if(c1a instanceof ILispAngle) {
			return ((ILispAngle)c1a).tan();
		} else {
			throw mesg.getError("err.require.complex", c1a);
		}
	}

}
