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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/>.
#' Check Argument Types, Length or Dimension
#'
#' @param arg An argument to be checked.
#' @param type A character vector of candidate argument type.
#' @param length A numeric value of argument length or NULL
#' @param dim A numeric vector of argument dimension or NULL.
#'
#' @details if `type`, `length` or `dim` is NULL, the corresponding check will not be executed.
#'
#' @section Specification:
#' \if{latex}{
#' \itemize{
#' \item Check if arg is NULL.
#' \item Extract the type, length and dim information from arg.
#' \item Compare with target 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 Check failure detailed error message
#'
#' @examples
#' tbl <- as.data.frame(matrix(1:9, nrow = 3))
#' check_args(arg = tbl, type = c("data.frame"))
#'
#' vec <- c("a", "b", "c")
#' try(check_args(arg = vec, type = c("character"), length = c(2, 4)))
#'
#' @noRd
check_args <- function(arg, type, length = NULL, dim = NULL) {
if (is.null(arg)) {
return(NULL)
}
if (any(class(arg) %in% "matrix")) arg <- as.vector(arg)
check <- list()
message <- list()
if (!is.null(type)) {
check[["type"]] <- any(class(arg) %in% type) & (!is.null(class(arg)))
message[["type"]] <- paste("The argument type did not match:", paste(type, collapse = "/"))
}
if (!is.null(length)) {
check[["length"]] <- all(length(arg) %in% length) & (!is.null(length(arg)))
message[["length"]] <- paste("The argument length is not", paste(length, collapse = ", "))
}
if (!is.null(dim)) {
check[["dim"]] <- all(dim(arg) == dim) & (!is.null(dim(arg)))
message[["dim"]] <- paste("The argument dimension is not", paste(dim, collapse = ","))
}
check <- unlist(check)
message <- unlist(message)
if (!all(unlist(check))) {
stop(paste(message[!check], collapse = "\n"))
} else {
return(NULL)
}
}
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