# start_check <- function() {
# c()
# }
#
# check <- function(x, condition, ...) {
# message <- paste0(...)
# if (isFALSE(condition)) {
# x <- c(x, paste0(length(x) + 1, ": ", message, "\n"))
# }
# x
# }
#
# check_not <- function(x, condition, ...) {
# check(x, !condition, ...)
# }
#
# check_in <- function(x, arg, ...) {
# match <- c(...)
# msg <- paste0("'", match, "'")
# if (length(match) == 2) msg <- paste0(msg, collapse = " or ")
# if (length(match) > 2) msg <- paste0("one of ", paste0(msg, collapse = ", "))
# check(x, arg %in% match, as.character(match.call()[3]), " is not ", msg, ".")
# }
#
# check_within <- function(x, arg, lower, upper) {
# if (!missing(lower))
# x <- check_not(
# x, any(unlist(arg) < lower), as.character(match.call()[3]), " < ", lower
# )
# if (!missing(upper))
# x <- check_not(
# x, any(unlist(arg) > upper), as.character(match.call()[3]), " > ", upper
# )
# x
# }
#
# check_class <- function(x, param, class, ...) {
# check(
# x,
# inherits(param, class),
# as.character(match.call()[3]), " not of class ", class
# )
# }
#
# end_check <- function(x) {
# if (length(x) > 0) {
# stop("\n", x, call. = FALSE)
# }
# }
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