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#' Filter a `MISSING_LIST_TABLE` for rows matching the variable `rv`
#'
#' In `MISSING_LIST_TABLE`, a column `resp_vars` may be specified. If so,
#' and if, for a row, this column is not empty, then that row only affects the
#' one variable specified in that cell
#'
#' @param table [cause_label_df] a data frame with missing codes and
#' optionally `resp_vars`. It also comprises
#' labels and optionally an interpretation
#' column with `AAPOR` codes. Must already cover
#' the variable `rv`, i.e., item level metadata
#' is not checked to find the suitable missing
#' table for `rv`.
#'
#' @param rv [variable] the response variable to filter the missing list for
#' specified by a label.
#' @param rv2 [variable] the response variable to filter the missing list for
#' specified by a `VAR_NAMES`-name.
#'
#' @return [data.frame] the row-wise bound data frames as one data frame
util_filter_missing_list_table_for_rv <- function(table, rv, rv2 = rv) {
util_expect_scalar(rv, check_type = is.character)
util_expect_scalar(rv2, check_type = is.character)
util_expect_data_frame(table)
if (!("resp_vars" %in% colnames(table))) { # no filter column, all rows match
return(table)
}
unspecific <- table[util_empty(table[["resp_vars"]]), ,
FALSE] # rows w/o resp_vars restriction
specific <- table[!util_empty(table[["resp_vars"]]) &
trimws(table[["resp_vars"]]) %in% c(rv, rv2), ,
FALSE] # rows restricted by resp_vars on rv
rbind(specific, unspecific) # combine both
}
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