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/*
 * #%L
 * The AIBench Shell Plugin
 * %%
 * Copyright (C) 2006 - 2017 Daniel Glez-Peña and Florentino Fdez-Riverola
 * %%
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 * published by the Free Software Foundation, either version 3 of the
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 * GNU General Lesser Public License for more details.
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 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
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 */
/*****************************************************************************
 *                                                                           *
 *  This file is part of the BeanShell Java Scripting distribution.          *
 *  Documentation and updates may be found at http://www.beanshell.org/      *
 *                                                                           *
 *  Sun Public License Notice:                                               *
 *                                                                           *
 *  The contents of this file are subject to the Sun Public License Version  *
 *  1.0 (the "License"); you may not use this file except in compliance with *
 *  the License. A copy of the License is available at http://www.sun.com    * 
 *                                                                           *
 *  The Original Code is BeanShell. The Initial Developer of the Original    *
 *  Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright     *
 *  (C) 2000.  All Rights Reserved.                                          *
 *                                                                           *
 *  GNU Public License Notice:                                               *
 *                                                                           *
 *  Alternatively, the contents of this file may be used under the terms of  *
 *  the GNU Lesser General Public License (the "LGPL"), in which case the    *
 *  provisions of LGPL are applicable instead of those above. If you wish to *
 *  allow use of your version of this file only under the  terms of the LGPL *
 *  and not to allow others to use your version of this file under the SPL,  *
 *  indicate your decision by deleting the provisions above and replace      *
 *  them with the notice and other provisions required by the LGPL.  If you  *
 *  do not delete the provisions above, a recipient may use your version of  *
 *  this file under either the SPL or the LGPL.                              *
 *                                                                           *
 *  Patrick Niemeyer ([email protected])                                           *
 *  Author of Learning Java, O'Reilly & Associates                           *
 *  http://www.pat.net/~pat/                                                 *
 *                                                                           *
 *****************************************************************************/

package bsh;

class BSHIfStatement extends SimpleNode {
        BSHIfStatement(int id) {
                super(id);
        }

        public Object eval(CallStack callstack, Interpreter interpreter) throws EvalError {
                Object ret = null;

                if (evaluateCondition((SimpleNode) jjtGetChild(0), callstack, interpreter))
                        ret = ((SimpleNode) jjtGetChild(1)).eval(callstack, interpreter);
                else if (jjtGetNumChildren() > 2)
                        ret = ((SimpleNode) jjtGetChild(2)).eval(callstack, interpreter);

                if (ret instanceof ReturnControl)
                        return ret;
                else
                        return Primitive.VOID;
        }

        public static boolean evaluateCondition(SimpleNode condExp, CallStack callstack, Interpreter interpreter) throws EvalError {
                Object obj = condExp.eval(callstack, interpreter);
                if (obj instanceof Primitive) {
                        if (obj == Primitive.VOID)
                                throw new EvalError("Condition evaluates to void type", condExp, callstack);
                        obj = ((Primitive) obj).getValue();
                }

                if (obj instanceof Boolean)
                        return ((Boolean) obj).booleanValue();
                else
                        throw new EvalError("Condition must evaluate to a Boolean or boolean.", condExp, callstack);
        }
}