/*
 * Copyright (c) 2015 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 org.jruby.truffle.nodes.literal;

import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.NodeCost;
import com.oracle.truffle.api.nodes.NodeInfo;
import com.oracle.truffle.api.source.SourceSection;
import org.jcodings.specific.UTF8Encoding;
import org.jruby.truffle.nodes.RubyNode;
import org.jruby.truffle.runtime.RubyContext;
import org.jruby.truffle.runtime.core.StringOperations;
import org.jruby.truffle.runtime.layouts.Layouts;
import org.jruby.util.StringSupport;

// For isDefined() and convenience
@NodeInfo(cost = NodeCost.NONE)
public class NilNode extends RubyNode {

    public NilNode(RubyContext context, SourceSection sourceSection) {
        super(context, sourceSection);
    }

    @Override
    public Object execute(VirtualFrame frame) {
        return nil();
    }

    @Override
    public Object isDefined(VirtualFrame frame) {
        return create7BitString(StringOperations.encodeByteList("nil", UTF8Encoding.INSTANCE));
    }

}
