/**
 * $Id: NullCommand.java 388 2010-03-08 12:27:19Z daldei $
 * $Date: 2010-03-08 07:27:19 -0500 (Mon, 08 Mar 2010) $
 *
 */

package org.xmlsh.sh.core;

import java.io.PrintWriter;
import org.xmlsh.core.EvalEnv;
import org.xmlsh.core.XValue;
import org.xmlsh.sh.shell.Shell;

public class ReturnStatement extends CommandExpr {

  private static final EvalEnv mEnv = EvalEnv.basicInstance();
  private Word mArg;

  @Override
  public boolean isSimple() {
    return false;
  }

  public ReturnStatement(Word arg) {
    mArg = arg;
  }

  @Override
  public void print(PrintWriter out, boolean bExec) {
    out.print("return ");
    if(mArg != null)
      mArg.print(out);

  }

  @Override
  public int exec(Shell shell) throws Exception {

    XValue ret = null;

    // No argument to return
    // e.g return ;

    if(mArg == null)
      ret = null; // will convert to empty sequence and set last exit value
    else {
      ret = mArg.expand(shell, mEnv);
      if(ret == null)
        ret = XValue.empytSequence();
    }
    shell.exec_return(ret);
    return 0;
  }

}
//
//
// Copyright (C) 2008-2014 David A. Lee.
//
// The contents of this file are subject to the "Simplified BSD License" (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.opensource.org/licenses/bsd-license.php
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations
// under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is David A. Lee
//
// Portions created by (your name) are Copyright (C) (your legal entity). All
// Rights Reserved.
//
// Contributor(s): none.
//