.map <- function(.x, .f, ...) {
lapply(.x, .f, ...)
}
map_mold <- function(.x, .f, .mold, ...) {
out <- vapply(.x, .f, .mold, ..., USE.NAMES = FALSE)
names(out) <- names(.x)
out
}
.map_lgl <- function(.x, .f, ...) {
map_mold(.x, .f, logical(1), ...)
}
.map_int <- function(.x, .f, ...) {
map_mold(.x, .f, integer(1), ...)
}
.map_dbl <- function(.x, .f, ...) {
map_mold(.x, .f, double(1), ...)
}
.map_chr <- function(.x, .f, ...) {
map_mold(.x, .f, character(1), ...)
}
.map2 <- function(.x, .y, .f, ...) {
out <- mapply(.f, .x, .y, MoreArgs = list(...), SIMPLIFY = FALSE)
if (length(out) == length(.x)) {
.set_names(out, names(.x))
} else {
.set_names(out, NULL)
}
}
.map2_lgl <- function(.x, .y, .f, ...) {
as.vector(.map2(.x, .y, .f, ...), "logical")
}
.map2_int <- function(.x, .y, .f, ...) {
as.vector(.map2(.x, .y, .f, ...), "integer")
}
.map2_dbl <- function(.x, .y, .f, ...) {
as.vector(.map2(.x, .y, .f, ...), "double")
}
.map2_chr <- function(.x, .y, .f, ...) {
as.vector(.map2(.x, .y, .f, ...), "character")
}
args_recycle <- function(args) {
lengths <- .map_int(args, length)
n <- max(lengths)
stopifnot(all(lengths == 1L | lengths == n))
to_recycle <- lengths == 1L
args[to_recycle] <- .map(args[to_recycle], function(x) rep.int(x, n))
args
}
.pmap <- function(.l, .f, ...) {
args <- args_recycle(.l)
do.call("mapply", c(
FUN = list(quote(.f)),
args, MoreArgs = quote(list(...)),
SIMPLIFY = FALSE, USE.NAMES = FALSE
))
}
probe <- function(.x, .p, ...) {
if (is.logical(.p)) {
stopifnot(length(.p) == length(.x))
.p
} else {
.map_lgl(.x, .p, ...)
}
}
.keep <- function(.x, .f, ...) {
.x[probe(.x, .f, ...)]
}
.discard <- function(.x, .p, ...) {
sel <- probe(.x, .p, ...)
.x[is.na(sel) | !sel]
}
.map_if <- function(.x, .p, .f, ...) {
matches <- probe(.x, .p)
.x[matches] <- .map(.x[matches], .f, ...)
.x
}
.compact <- function(.x) {
Filter(length, .x)
}
.imap <- function(.x, .f, ...) {
.map2(.x, vec_index(.x), .f, ...)
}
vec_index <- function(x) {
names(x) %||% seq_along(x)
}
.is_empty <- function(x) {
length(x) == 0L
}
.set_names <- function(x, nm = x, ...) {
stopifnot(length(x) == length(nm))
names(x) <- nm
x
}
`%||%` <- function(lhs, rhs) {
if (is.null(lhs)) rhs else lhs
}
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