1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
furrr_recycle_common <- function(x, n) {
n_x <- length(x)
lengths <- lengths(x)
idx <- rep_len(1L, n)
for (i in seq_len(n_x)) {
elt <- x[[i]]
# Don't recycle `NULL` elements, they can be indexed fine by `[` and `[[`
# and are considered like missing arguments
if (is.null(elt)) {
next
}
length_elt <- lengths[[i]]
if (length_elt == n) {
next
}
if (length_elt == 1L) {
x[[i]] <- elt[idx]
next
}
abort(paste0("Internal error: Incompatible lengths at location ", i, "."))
}
x
}
# Can't use `vec_size_common()` because we extract elements with `[[` and
# respect length invariants, not size invariants
furrr_length_common <- function(x) {
# Don't consider `NULL` elements in common size
x <- compact_null(x)
# Handle empty pmap input
if (length(x) == 0L) {
return(0L)
}
lengths <- lengths(x)
indices <- seq_along(lengths)
purrr::reduce2(lengths, indices, furrr_length2, .init = 1L)
}
furrr_length2 <- function(x, y, i) {
if (x == 1L) {
y
} else if (y == 1L) {
x
} else if (x == y) {
x
} else {
msg <- paste0("Can't recycle length ", x, " and length ", y, " at location ", i, ".")
abort(msg)
}
}
compact_null <- function(x) {
null <- purrr::map_lgl(x, is.null)
if (any(null)) {
x[!null]
} else {
x
}
}
|
