Nothing
#' Expand origin-destination pairs
#'
#' This function is used in [detailed_itineraries()] to update the `origins` and
#' `destinations` datasets.
#'
#' @param origins Passed by [detailed_itineraries()].
#' @param destinations Passed by [detailed_itineraries()].
#' @param all_to_all Passed by [detailed_itineraries()].
#'
#' @keywords internal
expand_od_pairs <- function(origins, destinations, all_to_all) {
checkmate::assert_logical(all_to_all, len = 1, any.missing = FALSE)
n_origs <- nrow(origins)
n_dests <- nrow(destinations)
if (all_to_all || n_origs == 1 || n_dests == 1) {
origins <- origins[rep(1:n_origs, each = n_dests), ]
destinations <- destinations[rep(1:n_dests, times = n_origs), ]
if (!all_to_all && (n_origs > 1 || n_dests > 1)) {
if (n_origs == 1) {
message("'origins' was expanded to match the number of destinations.")
} else {
message("'destinations' was expanded to match the number of origins.")
}
}
} else if (n_origs != n_dests) {
stop(
"When 'all_to_all' is FALSE, 'origins' and 'destinations' must either ",
"have the same number of rows or one of them must have only one row."
)
}
result <- list(origins = origins, destinations = destinations)
return(result)
}
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