/*
 * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This
 * code is released under a tri EPL/GPL/LGPL license. You can use it,
 * redistribute it and/or modify it under the terms of the:
 *
 * Eclipse Public License version 1.0
 * GNU General Public License version 2
 * GNU Lesser General Public License version 2.1
 */
package com.oracle.truffle.ruby.nodes.methods.arguments;

import com.oracle.truffle.api.*;
import com.oracle.truffle.api.frame.*;
import com.oracle.truffle.api.nodes.*;
import com.oracle.truffle.ruby.nodes.*;
import com.oracle.truffle.ruby.runtime.*;
import com.oracle.truffle.ruby.runtime.core.array.*;

/**
 * Assuming argument 0 is an array, read an element from that array.
 */
@NodeInfo(shortName = "read-destructure-argument")
public class ReadDestructureArgumentNode extends RubyNode {

    private final int index;

    public ReadDestructureArgumentNode(RubyContext context, SourceSection sourceSection, int index) {
        super(context, sourceSection);
        this.index = index;
    }

    @Override
    public Object execute(VirtualFrame frame) {
        final RubyArray array = (RubyArray) frame.getArguments(RubyArguments.class).getArguments()[0];
        return array.get(index);
    }

}