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#' Create or retrieve date related labels
#'
#' @description
#' When parsing and formatting dates, you often need to know how weekdays of
#' the week and months are represented as text. These functions allow you
#' to either create your own labels, or look them up from a standard set of
#' language specific labels. The standard list is derived from ICU
#' (<https://unicode-org.github.io/icu/>) via the stringi package.
#'
#' - `clock_labels_lookup()` looks up a set of labels from a
#' given language code.
#'
#' - `clock_labels_languages()` lists the language codes that are accepted.
#'
#' - `clock_labels()` lets you create your own set of labels. Use this if the
#' currently supported languages don't meet your needs.
#'
#' @param month,month_abbrev `[character(12)]`
#'
#' Full and abbreviated month names. Starts with January.
#'
#' @param weekday,weekday_abbrev `[character(7)]`
#'
#' Full and abbreviated weekday names. Starts with Sunday.
#'
#' @param am_pm `[character(2)]`
#'
#' Names used for AM and PM.
#'
#' @return A `"clock_labels"` object.
#'
#' @export
#' @examples
#' clock_labels_lookup("en")
#' clock_labels_lookup("ko")
#' clock_labels_lookup("fr")
clock_labels <- function(
month,
month_abbrev = month,
weekday,
weekday_abbrev = weekday,
am_pm
) {
if (!is_character(month, n = 12L)) {
abort("`month` must be a character vector of length 12.")
}
if (!is_character(month_abbrev, n = 12L)) {
abort("`month_abbrev` must be a character vector of length 12.")
}
if (!is_character(weekday, n = 7L)) {
abort("`weekday` must be a character vector of length 7.")
}
if (!is_character(weekday_abbrev, n = 7L)) {
abort("`weekday_abbrev` must be a character vector of length 7.")
}
if (!is_character(am_pm, n = 2L)) {
abort("`am_pm` must be a character vector of length 2.")
}
structure(
list(
month = enc2utf8(month),
month_abbrev = enc2utf8(month_abbrev),
weekday = enc2utf8(weekday),
weekday_abbrev = enc2utf8(weekday_abbrev),
am_pm = enc2utf8(am_pm)
),
class = "clock_labels"
)
}
#' @rdname clock_labels
#' @param language `[character(1)]`
#'
#' A BCP 47 locale, generally constructed from a two or three
#' digit language code. See `clock_labels_languages()` for a complete list of
#' available locales.
#' @export
clock_labels_lookup <- function(language) {
check_string(language)
labels <- clock_labels_list[[language]]
if (is.null(labels)) {
cli::cli_abort("Can't find a locale for {.str {language}}.")
}
labels
}
#' @export
#' @rdname clock_labels
clock_labels_languages <- function() {
names(clock_labels_list)
}
#' @export
print.clock_labels <- function(x, ...) {
cat("<clock_labels>\n")
if (identical(x$weekday, x$weekday_abbrev)) {
weekday <- paste0(x$weekday, collapse = ", ")
} else {
weekday <- paste0(x$weekday, " (", x$weekday_abbrev, ")", collapse = ", ")
}
if (identical(x$month, x$month_abbrev)) {
month <- paste0(x$month, collapse = ", ")
} else {
month <- paste0(x$month, " (", x$month_abbrev, ")", collapse = ", ")
}
am_pm <- paste0(x$am_pm, collapse = "/")
cat_wrap("Weekdays: ", weekday)
cat_wrap("Months: ", month)
cat_wrap("AM/PM: ", am_pm)
}
check_clock_labels <- function(
x,
...,
arg = caller_arg(x),
call = caller_env()
) {
check_inherits(x, what = "clock_labels", arg = arg, call = call)
}
cat_wrap <- function(header, body) {
body <- strwrap(body, exdent = nchar(header))
cat(header, paste(body, collapse = "\n"), "\n", sep = "")
}
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