R/second.R

Defines functions `dtt_second<-.hms` `dtt_second<-.POSIXct` dtt_second.hms dtt_second.POSIXct dtt_second.Date `dtt_second<-` dtt_second

Documented in dtt_second dtt_second.Date dtt_second.hms dtt_second.POSIXct

#' Get and Set Second Values
#'
#' Gets and sets second values for date/time vectors.
#'
#' @param x A date/time vector.
#' @param value A integer vector of the second value(s).
#' @param ... Unused.
#' @return An integer vector (or the modified date/time vector).
#' @export
#'
#' @examples
#' x <- as.POSIXct("1990-01-02 23:40:51")
#' dtt_second(x)
#' dtt_second(x) <- 27L
#' x
#'
#' x <- hms::as_hms("23:40:51")
#' dtt_second(x)
#' dtt_second(x) <- 27L
#' x
dtt_second <- function(x, ...) {
  UseMethod("dtt_second")
}

#' @rdname dtt_second
#' @export
`dtt_second<-` <- function(x, value) {
  UseMethod("dtt_second<-")
}

#' @describeIn dtt_second Get integer vector of second values for a Date vector
#' @export
dtt_second.Date <- function(x, ...) {
  chk_unused(...)
  rep(0L, length(x))
}

#' @describeIn dtt_second Get integer vector of second values for a POSIXct vector
#' @export
dtt_second.POSIXct <- function(x, ...) {
  chk_unused(...)
  x <- as.POSIXlt(x, tz = dtt_tz(x))
  as.integer(x$sec)
}

#' @describeIn dtt_second Get integer vector of second values for a time vector
#' @export
dtt_second.hms <- function(x, ...) {
  chk_unused(...)
  x <- dtt_time(x)
  x <- as.POSIXlt(x)
  as.integer(x$sec)
}

#' @describeIn dtt_second Set second values for a POSIXct vector
#' @export
`dtt_second<-.POSIXct` <- function(x, value) {
  chk_whole_numeric(value)
  chk_range(value, c(0L, 59L))
  chk_subset(length(value), c(1L, length(x)))

  if (!length(x)) {
    return(x)
  }
  tz <- dtt_tz(x)
  x <- as.POSIXlt(x, tz = tz)
  x$sec <- value
  as.POSIXct(format(x), tz = tz)
}

#' @describeIn dtt_second Set second values for a hms vector
#' @export
`dtt_second<-.hms` <- function(x, value) {
  chk_whole_numeric(value)
  chk_range(value, c(0L, 59L))
  chk_subset(length(value), c(1L, length(x)))

  if (!length(x)) {
    return(x)
  }
  x <- as.POSIXlt(x)
  x$sec <- value
  dtt_time(x)
}

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dttr2 documentation built on July 10, 2020, 5:06 p.m.