/*
 * Copyright 2013 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.awk.nano.expr;

import java.util.Collection;

import net.morilib.awk.nano.io.AwkFiles;
import net.morilib.awk.nano.namespace.AwkNamespace;
import net.morilib.awk.nano.value.AwkString;
import net.morilib.awk.nano.value.AwkValue;

/**
 * 多次元配列の参照を表す中間表現です。
 * 
 * @author MORIGUCHI, Yuichiro 2013/03
 */
public class AwkMultiArrayOp extends AwkExpression {

	private AwkExpression[] exprs;

	/**
	 * 中間表現を生成します。
	 * 
	 * @param exprs 配列の添字の集合
	 */
	public AwkMultiArrayOp(Collection<AwkExpression> exprs) {
		this.exprs = exprs.toArray(new AwkExpression[0]);
	}

	/* (non-Javadoc)
	 * @see net.morilib.awk.expr.AwkExpression#eval(net.morilib.awk.namespace.AwkNamespace, net.morilib.awk.io.AwkFiles)
	 */
	@Override
	public AwkValue eval(AwkNamespace ns, AwkFiles f) {
		StringBuffer b = new StringBuffer();
		String ss = ns.getRoot().find("SUBSEP").toString(ns);
		String d = "";

		for(AwkExpression e : exprs) {
			b.append(d).append(e.eval(ns, f).toString(ns));
			d = ss;
		}
		return AwkString.valueOf(b.toString());
	}

}
