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#' Check Attributes
#'
#' Checks an objects attributes.
#'
#' @inheritParams check_list
#' @param names A flag specifying whether names should be considered an attribute.
#' @param class A flag specifying whether class should be considered an attribute.
#' @return An invisible copy of x (if it doesn't throw an error).
#' @seealso \code{\link{check_list}}
#' @export
#'
#' @examples
#' x <- 1
#' attributes(x) <- list(y = 2L)
#' check_attributes(x, values = list(y = 3:4), error = FALSE)
check_attributes <- function(x,
values = NULL,
exclusive = FALSE,
order = FALSE,
names = TRUE,
class = TRUE,
x_name = substitute(x),
error = TRUE) {
x_name <- chk_deparse(x_name)
check_flag_internal(names)
check_flag_internal(class)
check_flag_internal(error)
attr <- attributes(x)
if(!class) attr$class <- NULL
if(!names) attr$names <- NULL
if(!length(attr)) chk_fail(x_name, " must have attributes", error = error)
if(!is.null(attr) && !is.null(values)) {
check_list(attr, values = values, order = order, exclusive = exclusive,
x_name = paste("attributes of", x_name), error = error)
}
invisible(x)
}
#' Check No Attributes
#'
#' Checks an object has no attributes.
#'
#' @inheritParams check_list
#' @inheritParams check_attributes
#' @return An invisible copy of x (if it doesn't throw an error).
#' @seealso \code{\link{check_attributes}}
#' @export
#'
#' @examples
#' x <- 1
#' attributes(x) <- list(y = 2L)
#' check_no_attributes(x, error = FALSE)
check_no_attributes <- function(x,
names = TRUE,
class = TRUE,
x_name = substitute(x),
error = TRUE) {
x_name <- chk_deparse(x_name)
check_flag_internal(error)
attr <- attributes(x)
if(!class) attr$class <- NULL
if(!names) attr$names <- NULL
if(length(attr)) chk_fail(x_name, " must not have attributes", error = error)
invisible(x)
}
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