private string xmlRE(ArrayList t)
        {
            string xml = "";

            xml += "<ListaErrores>\n";
            for (int i = 0; i < t.Count; i++)
            {
                Errores at = (Errores)t[i];
                xml += "  <Error>\n";
                xml += "      <Valor>" + at.getLexema() + "</Valor>\n";
                xml += "      <Fila>" + at.getFila() + "</Fila>\n";
                xml += "      <Columna>" + at.getColumna() + "</Columna>\n";

                xml += "  </Error>\n";
            }
            xml += "</ListaErrores>\n";
            return(xml);
        }
        private string htmlRE(ArrayList t)
        {
            string html = "";

            html += "<!DOCTYPE html>  \n";
            html += "<html>  \n";
            html += "<head><title>Reporte de errores</title></head>  \n";
            html += "<body> \n";
            html += "<h1>Listado de errores</h1>  \n";
            html += "<table border=\"1px\" solid #0000 border-collapse: collapse>   \n";
            html += "<tr>  \n";
            html += "<th border=\"1px\" solid #0000 border-collapse: collapse> Error</th>  \n";
            html += "<th border=\"1px\" solid #0000 border-collapse: collapse> Tipo</th>  \n";
            html += "<th border=\"1px\" solid #0000 border-collapse: collapse> Fila</th>  \n";
            html += "<th border=\"1px\" solid #0000 border-collapse: collapse> Columna</th>  \n";
            html += "</tr>  \n";
            for (int i = 0; i < t.Count; i++)
            {
                Errores at = (Errores)t[i];
                html += "<tr> \n";
                html += "<td border=\"1px\" solid #0000 border-collapse: collapse> " + at.getLexema() + "</td>  \n";
                html += "<td border=\"1px\" solid #0000 border-collapse: collapse> Error Lexico</td>  \n";
                html += "<td border=\"1px\" solid #0000 border-collapse: collapse> " + at.getFila() + "</td>  \n";
                html += "<td border=\"1px\" solid #0000 border-collapse: collapse> " + at.getColumna() + "</td>  \n";

                html += "</tr> \n";
            }


            html += "</table> \n";
            html += "</body>  \n";
            html += "</html>  \n";
            return(html);
        }