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#' Check Atomic Vector Intersection
#'
#' Checks that all the elements in atomic vector x intersect with those in atomic vector y.
#'
#' @param x The object to check.
#' @param y The second atomic vector.
#' @param all_y A flag indicating whether all the elements in y should have a match in x.
#' @param x_name A string of the name of the object x.
#' @param y_name A string of the name of the object y.
#' @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_join}}
#' @export
#'
#' @examples
#' x1 <- 1:3
#' x2 <- 1:4
#' check_intersection(x1, x2)
#' check_intersection(x2, x1, error = FALSE)
check_intersection <- function(x, y,
all_y = FALSE,
x_name = substitute(x),
y_name = substitute(y),
error = TRUE) {
x_name <- chk_deparse(x_name)
y_name <- chk_deparse(y_name)
check_vector(x, x_name = x_name)
check_vector(y, x_name = y_name)
check_flag_internal(error)
check_flag(all_y)
if(length(setdiff(x, y)))
chk_fail(y_name, " must include all the elements in ", x_name, error = error)
if(all_y && length(setdiff(y, x)))
chk_fail(x_name, " must include all the elements in ", y_name, error = error)
invisible(x)
}
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