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#' Constructive options for arrays
#'
#' These options will be used on arrays. Note that arrays can be built on top of
#' vectors, lists or expressions. Canonical arrays have an implicit class "array"
#' shown by `class()` but "array" is not part of the class attribute.
#'
#' Depending on `constructor`, we construct the object as follows:
#' * `"array"` (default): Use the `array()` function
#' * `"next"` : Use the constructor for the next supported class. Call `.class2()`
#' on the object to see in which order the methods will be tried.
#'
#' @param constructor String. Name of the function used to construct the object, see Details section.
#' @inheritParams opts_atomic
#' @return An object of class <constructive_options/constructive_options_array>
#' @export
opts_array <- function(constructor = c("array", "next"), ...) {
.cstr_options("array", constructor = constructor[[1]], ...)
}
#' @export
#' @method .cstr_construct array
.cstr_construct.array <- function(x, ...) {
opts <- list(...)$opts$array %||% opts_array()
if (is_corrupted_array(x) || opts$constructor == "next") return(NextMethod())
UseMethod(".cstr_construct.array", structure(NA, class = opts$constructor))
}
is_corrupted_array <- function(x) {
!("dim" %in% names(attributes(x)) && (is.atomic(x) || is.list(x) || is.expression(x)))
}
#' @export
#' @method .cstr_construct.array array
.cstr_construct.array.array <- function(x, ...) {
# build args for array() call
x_stripped <- x
attributes(x_stripped) <- NULL
args <- list(
x_stripped,
dim = attr(x, "dim")
)
dimnames <- attr(x, "dimnames")
args$dim_names <- if (!is.null(dimnames)) list(dimnames = dimnames)
# build code
code <- .cstr_apply(args, fun = "array", ...)
# repair
repair_attributes_array(x, code, ...)
}
repair_attributes_array <- function(x, code, ..., pipe = NULL) {
.cstr_repair_attributes(
x, code, ...,
pipe = pipe,
ignore = "dim"
)
}
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