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#' Create an `ElementaryTable` from a `data.frame`
#'
#' @param df (`data.frame`)\cr a data frame.
#'
#' @details
#' If row names are not defined in `df` (or they are simple numbers), then the row names are taken from the column
#' `label_name`, if it exists. If `label_name` exists, then it is also removed from the original data. This behavior
#' is compatible with [as_result_df()], when `as_is = TRUE` and the row names are not unique.
#'
#' @seealso [as_result_df()] for the inverse operation.
#'
#' @examples
#' df_to_tt(mtcars)
#'
#' @export
df_to_tt <- function(df) {
colnms <- colnames(df)
cinfo <- manual_cols(colnms)
rnames <- rownames(df)
havern <- !is.null(rnames)
if ((!havern || all(grepl("[0-9]+", rnames))) && "label_name" %in% colnms) {
rnames <- df$label_name
df <- df[, -match("label_name", colnms)]
colnms <- colnames(df)
cinfo <- manual_cols(colnms)
havern <- TRUE
}
kids <- lapply(seq_len(nrow(df)), function(i) {
rni <- if (havern) rnames[i] else ""
do.call(rrow, c(list(row.name = rni), unclass(df[i, ])))
})
ElementaryTable(kids = kids, cinfo = cinfo)
}
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