.ISO8601subset <-
function (x, i)
{
if (missing(i)) {
i <- 1:NROW(x)
}
else if (is.xtime(i)) {
i <- match(i, x)
}
else if (!missing(i) && is.numeric(i)) {
if (.Call("any_negative", i, PACKAGE = "xtime")) {
if (!all(i <= 0))
stop("only zeros may be mixed with negative subscripts")
i <- (1:length(x))[i]
}
if (max(i) > length(x))
stop("subscript out of bounds")
}
else if (inherits(i, "AsIs") && is.character(i)) {
i <- match(i, format(x))
}
else if (timeBased(i)) {
if (inherits(i, "POSIXct")) {
i <- which(!is.na(match(x, i)))
}
else {
i <- which(!is.na(match(x, as.POSIXct(as.character(i)))))
}
i[is.na(i)] <- 0
}
else if (is.logical(i)) {
i <- which(i)
}
else if (is.character(i)) {
if (!isOrdered(x))
stop("ISO8601 subsetting requires ascending time")
if (length(i) == 1 && !identical(integer(), grep("^T.*?/T",
i[1]))) {
i <- gsub("T|:", "", i)
i <- strsplit(i, "/")[[1]]
i <- .makeISO8601TT(x, i[1], i[2])
}
i.tmp <- NULL
tz <- as.character(tzone(x))
for (ii in i) {
adjusted.times <- .parseISO8601(ii, x[1], x[NROW(x)],
tz = tz)
if (length(adjusted.times) > 1) {
firstlast <- c(seq.int(binsearch(adjusted.times$first.time,
x, TRUE), binsearch(adjusted.times$last.time,
x, FALSE)))
if (isOrdered(firstlast, strict = FALSE))
i.tmp <- c(i.tmp, firstlast)
}
}
i <- i.tmp
}
if (!isOrdered(i, strictly = FALSE)) {
i <- sort(i)
}
zero.index <- binsearch(0, i, NULL)
if (!is.na(zero.index))
i <- i[-zero.index]
i
}
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