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#' Check nlevels
#'
#' Checks the number of levels of an object.
#'
#' @param x The data to check.
#' @param nlevels A flag indicating whether x should have elements (versus no elements) or a missing value indicating no requirements or a count or count range of the number of elements.
#' @param x_name A string of the name of the object.
#' @param error A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.
#' @return An invisible copy of x (if it doesn't throw an error).
#' @seealso \code{\link{check_levels}} and \code{\link{check_vector}}
#' @export
#'
#' @examples
#' check_nlevels(factor(1), error = FALSE)
#' check_nlevels(factor(1), nlevels = 2, error = FALSE)
check_nlevels <- function(x,
nlevels = TRUE,
x_name = substitute(x),
error = TRUE) {
x_name <- chk_deparse(x_name)
check_length_internal(nlevels)
check_flag_internal(error)
check_n(x, n = nlevels(x), range = nlevels, x_name = x_name, n_name = "level", error = error)
invisible(x)
}
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