Nothing
#' @export
#' @rdname keyvalue
as.keyvalue.data.frame <- function(x, standard_var_names = NULL, ...){
if (ncol(x) != 2 || !all((c("key", "value") %in% names(x)))) {
stop("A keyvalue object must have exactly two columns: 'key' and 'value'!")
}
x <- x[order(x$key),]
x$value <- as.value(x$value)
x$key <- as.key(x$key)
class(x) <- c("keyvalue", "data.frame")
attr(x, "standard_var_names") <- standard_var_names
## If there is a 1:1-relation between the key and the value,
## this is declared in an extra attribute
if (!inherits(try(as.key(x$value), silent = TRUE), "try-error")) {
x$value <- as.key(x$value)
attr(x, "keyvalue11") <- TRUE
} else{
attr(x, "keyvalue11") <- FALSE
}
x
}
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