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/*
 * #%L
 * The AIBench Shell Plugin
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 * Copyright (C) 2006 - 2017 Daniel Glez-Peña and Florentino Fdez-Riverola
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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      *
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 *  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;

/**
 * name [ = initializer ] evaluate name and return optional initializer
 */
class BSHVariableDeclarator extends SimpleNode {
        // The token.image text of the name... never changes.
        public String name;

        BSHVariableDeclarator(int id) {
                super(id);
        }

        /**
         * Evaluate the optional initializer value. (The name was set at parse
         * time.)
         * 
         * A variable declarator can be evaluated with or without preceding type
         * information. Currently the type info is only used by array
         * initializers in the case where there is no explicitly declared type.
         * 
         * @param typeNode
         *                is the BSHType node. Its info is passed through to any
         *                variable intializer children for the case where the
         *                array initializer does not declare the type
         *                explicitly. e.g. int [] a = { 1, 2 }; typeNode may be
         *                null to indicate no type information available.
         */
        public Object eval(BSHType typeNode, CallStack callstack, Interpreter interpreter) throws EvalError {
                // null value means no value
                Object value = null;

                if (jjtGetNumChildren() > 0) {
                        SimpleNode initializer = (SimpleNode) jjtGetChild(0);

                        /*
                         * If we have type info and the child is an array
                         * initializer pass it along... Else use the default
                         * eval style. (This allows array initializer to handle
                         * the problem... allowing for future enhancements in
                         * loosening types there).
                         */
                        if ((typeNode != null) && initializer instanceof BSHArrayInitializer)
                                value = ((BSHArrayInitializer) initializer).eval(typeNode.getBaseType(), typeNode.getArrayDims(), callstack, interpreter);
                        else
                                value = initializer.eval(callstack, interpreter);
                }

                if (value == Primitive.VOID)
                        throw new EvalError("Void initializer.", this, callstack);

                return value;
        }

        public String toString() {
                return "BSHVariableDeclarator " + name;
        }
}