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#' @export
#' @importFrom BiocGenerics colnames rownames
.subset2index <- function(subset, target, byrow=TRUE)
## Converts a subsetting vector into a integer equivalent.
## Requires some care to handle logical/character vectors.
{
if (is.na(byrow)) {
dummy <- seq_along(target)
names(dummy) <- names(target)
} else if (byrow) {
dummy <- seq_len(nrow(target))
names(dummy) <- rownames(target)
} else {
dummy <- seq_len(ncol(target))
names(dummy) <- colnames(target)
}
if (!is.null(subset)) {
subset <- dummy[subset]
if (any(is.na(subset))) {
stop("invalid subset indices specified")
}
} else {
subset <- dummy
}
unname(subset)
}
.noOpSubset <- function(subset, n) {
is.null(subset) || identical(subset, seq_len(n))
}
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