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#' @describeIn preinstalled.readers Read a semicolon separated values file with the \code{.csv2} extension.
#'
#' In May 2018, the default behavior of the reader for .csv2 files changed to use R's read.csv2(),
#' where the field separator is assumed to be ';' and the decimal separator to be ','.
#'
#' @importFrom utils read.csv2
#' @importFrom utils unzip
csv2.reader <- function(data.file, filename, variable.name)
{
warning("In May 2018, the default behaviour of the reader for .csv2 files changed to use R's read.csv2(), where the field separator is assumed to be ';' and the decimal separator to be ','.")
if (grepl('\\.zip$', filename))
{
tmp.dir <- tempdir()
tmp.path <- file.path(tmp.dir, data.file)
file.copy(filename, tmp.path)
unzip(filename, exdir = tmp.dir)
filename <- file.path(tmp.dir, sub('\\.zip$', '', data.file))
}
assign(variable.name,
read.csv2(filename,
header = config$data_loading_header),
envir = .TargetEnv)
}
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