/*
 * Copyright 2009-2010 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.array;

import net.morilib.lisp.ConsIterator;
import net.morilib.lisp.Datum;
import net.morilib.lisp.Environment;
import net.morilib.lisp.LispInteger;
import net.morilib.lisp.LispMessage;
import net.morilib.lisp.Procedure;
import net.morilib.lisp.Subr;
import net.morilib.lisp.subr.SubrUtils;
import net.morilib.util.primitive.IntegerArrayVector;
import net.morilib.util.primitive.IntegerVector;

/**
 *
 *
 * @author MORIGUCHI, Yuichiro 2011/05/23
 */
public class MakeSharedArray extends Subr {

	/* (non-Javadoc)
	 * @see net.morilib.lisp.Subr#eval(net.morilib.lisp.Datum, net.morilib.lisp.Environment, net.morilib.lisp.LispMessage)
	 */
	@Override
	public Datum eval(Datum body, Environment env, LispMessage mesg) {
		ConsIterator itr = new ConsIterator(body);
		Datum a  = SubrUtils.nextIf(itr, mesg, body);
		Datum pr = SubrUtils.nextIf(itr, mesg, body);
		IntegerVector bin = new IntegerArrayVector();

		while(itr.hasNext()) {
			int b = SubrUtils.nextSmallInt(itr, mesg, body);

			if(b < 0) {
				throw mesg.getError("err.srfi25.arraysize.invalid",
						LispInteger.valueOf(b));
			}
			bin.add(b);
		}

		SubrUtils.checkTerminated(itr, body, mesg);
		if(!(a instanceof LispArray)) {
			throw mesg.getError("err.srfi25.require.array", a);
		} else if(!(pr instanceof Procedure)) {
			throw mesg.getError("err.require.procedure", pr);
		} else {
			return new LispSharedArray((LispArray)a, bin.toIntArray(),
					(Procedure)pr, env, mesg);
		}
	}

}
