#' Get Glottocode by ISO 639--3 code
#'
#' Takes any vector of ISO 639--3 codes and returns Glottocodes.
#' @param x A character vector of the Glottocodes.
#' @author George Moroz <agricolamz@gmail.com>
#' @seealso \code{\link{aff.lang}}, \code{\link{area.lang}}, \code{\link{lat.lang}}, \code{\link{long.lang}}
#' @examples
#' gltc.iso('ady')
#' gltc.iso(c('ady', 'rus'))
#' @export
gltc.iso <- function(x) {
if (typeof(x) == "list") {
x <- unlist(x)
}
glottolog <- lingtypology::glottolog
x <- gsub("\\W", "", x)
vapply(x, function(y) {
if(is.na(y)){
NA_character_
} else{
ifelse(y %in% glottolog$iso,
glottolog[tolower(glottolog$iso) %in% tolower(y), ]$glottocode,
NA_character_)
}}, character(1))
}
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