/// <summary>
        /// Generates the code for a ParenthesisExpression node.
        /// </summary>
        /// <param name="pe">The ParenthesisExpression node.</param>
        /// <returns>String containing C# code for ParenthesisExpression pe.</returns>
        private string GenerateParenthesisExpression(ParenthesisExpression pe)
        {
            string retstr = "";

            retstr += Generate("(");
            foreach (SYMBOL kid in pe.kids)
                retstr += GenerateNode(kid);
            retstr += Generate(")");

            return retstr.ToString();
        }
        /// <summary>
        /// Generates the code for a ParenthesisExpression node.
        /// </summary>
        /// <param name="pe">The ParenthesisExpression node.</param>
        /// <returns>String containing C# code for ParenthesisExpression pe.</returns>
        private string GenerateParenthesisExpression(ParenthesisExpression pe)
        {
            StringBuilder retstr = new StringBuilder();

            retstr.Append(Generate("("));
            foreach (SYMBOL kid in pe.kids)
                retstr.Append(GenerateNode(kid));
            retstr.Append(Generate(")"));

            return retstr.ToString();
        }