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.splitIndices <- function (nx, tasks)
{
## derived from parallel
i <- seq_len(nx)
if (nx == 0L)
list()
else if (tasks <= 1L || nx == 1L) # allow nx, nc == 0
list(i)
else {
fuzz <- min((nx - 1L)/1000, 0.4 * nx / tasks)
breaks <- seq(1 - fuzz, nx + fuzz, length.out = tasks + 1L)
si <- structure(split(i, cut(i, breaks)), names = NULL)
si[sapply(si, length) != 0]
}
}
.ntask <-
function(X, workers, tasks)
{
if (is.na(tasks)) {
length(X)
} else if (tasks == 0L) {
workers
} else {
min(length(X), tasks)
}
}
.splitX <-
function(X, workers, tasks)
{
tasks <- .ntask(X, workers, tasks)
idx <- .splitIndices(length(X), tasks)
relist(X, idx)
}
.redo_index <-
function(X, BPREDO)
{
if (length(BPREDO)) {
if (length(BPREDO) != length(X))
stop("'length(BPREDO)' must equal 'length(X)'")
idx <- which(!bpok(BPREDO))
if (!length(idx))
stop("no previous error in 'BPREDO'")
idx
} else {
seq_along(X)
}
}
## re-apply names on X of lapply(X, FUN) to the return value
.rename <-
function(results, X)
{
names(results) <- names(X)
results
}
.simplify <-
function(results, SIMPLIFY=FALSE)
{
if (SIMPLIFY && length(results))
results <- simplify2array(results)
results
}
.prettyPath <- function(tag, filepath)
{
wd <- options('width')[[1]] - nchar(tag) - 6
if (length(filepath) == 0 || is.na(filepath))
return(sprintf("%s: %s", tag, NA_character_))
if (0L == length(filepath) || nchar(filepath) < wd)
return(sprintf("%s: %s", tag, filepath))
bname <- basename(filepath)
wd1 <- wd - nchar(bname)
dname <- substr(dirname(filepath), 1, wd1)
sprintf("%s: %s...%s%s",
tag, dname, .Platform$file.sep, bname)
}
.getDotsForMapply <-
function(...)
{
ddd <- list(...)
if (!length(ddd))
return(list(list()))
len <- vapply(ddd, length, integer(1L))
if (!all(len == len[1L])) {
max.len <- max(len)
if (max.len && any(len == 0L))
stop("zero-length and non-zero length inputs cannot be mixed")
if (any(max.len %% len))
warning("longer argument not a multiple of length of vector")
ddd <- lapply(ddd, rep_len, length.out=max.len)
}
ddd
}
.dir_valid_rw <-
function(x)
{
all(file.access(x, 6L) == 0L)
}
.warning <- function(...) {
msg <- paste(
strwrap(paste0("\n", ...), indent = 2, exdent = 2), collapse="\n"
)
warning(msg, call. = FALSE)
}
.stop <- function(...) {
msg <- paste(
strwrap(paste0("\n", ...), indent = 2, exdent = 2), collapse="\n"
)
stop(msg, call. = FALSE)
}
## batchtools signals no timeout with 'Inf', rather than NA; do not
## implement as bptimeout() method because NA is appropriate in other
## contexts, e.g., when 'show()'ing param.
.batch_bptimeout <-
function(BPPARAM)
{
timeout <- bptimeout(BPPARAM)
if (identical(timeout, NA_integer_))
timeout <- Inf
timeout
}
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