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# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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 Library General Public License for more details.
#
# You should have received a copy of the GNU Library General
# Public License along with this library; if not, write to the
# Free Foundation, Inc., 59 Temple Place, Suite 330, Boston,
# MA 02111-1307 USA
# Copyrights (C)
# for this R-port:
# 1999 - Diethelm Wuertz, GPL
# 2007 - Rmetrics Foundation, GPL
# Diethelm Wuertz <wuertz@phys.ethz.ch>
# www.rmetrics.org
# for the code accessed (or partly included) from other R-ports:
# see R's copyright and license files
# for the code accessed (or partly included) from contributed R-ports
# and other sources
# see Rmetrics's copyright file
################################################################################
# FUNCTION: DESCRIPTION:
# whichFormat Returns format string called by 'timeDate'
################################################################################
whichFormat <-
function(charvec, silent = FALSE)
{
# A function implemented by Diethelm Wuertz
# Charvec String:
if (is.null(charvec)) # avoid problems in timeSeries() when rownames NULL
return("unknown")
charvec = as.character(charvec)
# Specifications:
NCHAR = mean(nchar(charvec))
NCHAR = nchar(charvec[1])
SUBSTR = (substring(charvec[1], 5, 5) == "-")
# American Format:
if (regexpr("/....", charvec[1])[[1]] > 0) return("%m/%d/%Y")
if (regexpr("-...-....", charvec[1])[[1]] > 0) return("%d-%b-%Y")
# DW:
# There should be better checks on the format identification ...
# Human readable ISO:
if (NCHAR == 4 & !SUBSTR) return("%Y")
if (NCHAR == 7 & SUBSTR) return("%Y-%m")
if (NCHAR == 10 & SUBSTR) return("%Y-%m-%d")
if (NCHAR == 13 & SUBSTR) return("%Y-%m-%d %H")
if (NCHAR == 16 & SUBSTR) return("%Y-%m-%d %H:%M")
if (NCHAR == 19 & SUBSTR) return("%Y-%m-%d %H:%M:%S")
# Short ISO:
if (NCHAR == 6 & !SUBSTR) return("%Y%m")
if (NCHAR == 8 & !SUBSTR) return("%Y%m%d")
if (NCHAR == 10 & !SUBSTR) return("%Y%m%d%H")
if (NCHAR == 12 & !SUBSTR) return("%Y%m%d%H%M")
if (NCHAR == 14 & !SUBSTR) return("%Y%m%d%H%M%S")
# Otherwise:
if (!silent)
warning("Could not determine time(date) format")
# Return Value:
"unknown"
}
# ------------------------------------------------------------------------------
.whichFormat <- whichFormat
################################################################################
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