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# Copyright (c) 2022 Merck & Co., Inc., Rahway, NJ, USA and its affiliates. All rights reserved.
#
# This file is part of the r2rtf program.
#
# r2rtf is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#' Argument Verification Using Partial Matching
#'
#' Similar to `match.arg()`, match_arg matches `arg` against a table of candidate values as specified by `choices`.
#'
#' @details This function resolves errors from `match.arg()` with '' as arg input.
#' @inheritParams base::match.arg
#' @section Specification:
#' \if{latex}{
#' \itemize{
#' \item Convert arg and choices inputs from numeric to characters.
#' \item Input choices imputation if it is missing.
#' \item Input arg imputation if it is NULL.
#' \item Input several.ok check for arg length.
#' \item Compare arg with choices values and report error message if it does not match.
#' }
#' }
#' \if{html}{The contents of this section are shown in PDF user manual only.}
#'
#' @return The matched elements of arg or in case of match failure a detailed error message
#'
#' @examples
#' \dontrun{
#' match_arg(arg = c(2, 1), choices = c(4, 3, 1, 2), several.ok = TRUE)
#' match_arg(arg = c("c", "b"), choices = c("a", "b", "c", "d"), several.ok = TRUE)
#' }
#'
#' @noRd
match_arg <- function(arg, choices, several.ok = FALSE) {
# following code are from match.arg with minor updates
# update to enable arg and choices to accept numeric and character vectors
if ("numeric" %in% class(arg)) {
arg <- as.character(arg)
}
if (class(choices) == c("numeric")) {
choices <- as.character(choices)
}
if (missing(choices)) {
formal.args <- formals(sys.function(sysP <- sys.parent()))
choices <- eval(formal.args[[as.character(substitute(arg))]],
envir = sys.frame(sysP)
)
}
if (is.null(arg) | length(arg) == 0L) {
return(choices[1L])
}
if (!several.ok) {
if (identical(arg, choices)) {
return(arg[1L])
}
if (length(arg) > 1L) {
stop("'arg' must be of length 1")
}
}
# i <- pmatch(arg, choices, nomatch = 0L, duplicates.ok = TRUE) # replaced by new code to debug
i <- charmatch(arg, choices, nomatch = 0L)
if (any(i == 0L)) {
stop(gettextf("all 'arg' should be one of %s", paste(dQuote(choices),
collapse = ", "
)), domain = NA)
}
i <- i[i > 0L]
if (!several.ok && length(i) > 1) {
stop("there is more than one match in 'match_arg'")
}
choices[i]
}
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