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#
# xts: eXtensible time-series
#
# Copyright (C) 2008 Jeffrey A. Ryan jeff.a.ryan @ gmail.com
#
# Contributions from Joshua M. Ulrich
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#' Get or Replace the Format of an xts Object's Index
#'
#' Generic functions to get or replace the format that determines how an xts
#' object's index is printed.
#'
#' Valid values for the `value` argument are the same as specified in the
#' *Details* section of [`strptime()`].
#'
#' An xts object's `tformat` is `NULL` by default, so the index will be
#' be formatted according to its [`tclass()`] (e.g. Date, POSIXct, timeDate,
#' yearmon, etc.).
#'
#' The `tformat` only changes how the index is *printed* and how the row names
#' are formatted when xts objects are converted to other classes (e.g. matrix
#' or data.frame). It does not affect the internal index in any way.
#'
#' @param x An xts object.
#' @param value New index format string (see [`strptime()`] details for valid
#' values).
#' @param \dots Arguments passed to other methods.
#'
#' @return A vector containing the format for the object's index.
#'
#' @note Both `indexFormat()` and `indexFormat<-` are deprecated in
#' favor of `tformat()` and `tformat<-`, respectively.
#'
#' @author Jeffrey A. Ryan
#'
#' @seealso [`index()`] has more information on the xts index, [`tclass()`]
#' details how \pkg{xts} handles the class of the index, [`tzone()`] has more
#' information about the index timezone settings.
#'
#' @keywords ts utilities
#' @examples
#'
#' x <- timeBasedSeq('2010-01-01/2010-01-02 12:00')
#' x <- xts(seq_along(x), x)
#'
#' # set a custom index format
#' head(x)
#' tformat(x) <- "%Y-%b-%d %H:%M:%OS3"
#' head(x)
#'
`tformat` <-
function(x, ...) {
UseMethod('tformat')
}
#' @rdname tformat
`tformat<-` <-
function(x, value) {
UseMethod('tformat<-')
}
`tformat.default` <-
function(x, ...) {
attr(x, 'tformat')
}
`tormat<-.default` <-
function(x, value) {
attr(x, '.tformat') <- value
x
}
`tformat.xts` <-
function(x, ...) {
ix <- .index(x)
attr(ix, 'tformat')
}
`tformat<-.xts` <-
function(x, value) {
if(!is.character(value) && !is.null(value))
stop('must provide valid POSIX formatting string')
# Remove format attrs (object created before 0.10-3)
attr(x, ".indexFORMAT") <- NULL
attr(attr(x, 'index'), 'tformat') <- value
x
}
#' @rdname tformat
`indexFormat` <-
function(x) {
.Deprecated("tformat", "xts")
tformat(x)
}
#' @rdname tformat
`indexFormat<-` <-
function(x, value) {
.Deprecated("tformat<-", "xts")
`tformat<-`(x, value)
}
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