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# Shiny has been tried and tested on different encodings
# adoption from https://github.com/rstudio/shiny/blob/6ede0194c6e52d18be3ec13514defd8e0f22a3c1/R/utils.R#L1459-L1532
isWindows <- function() .Platform$OS.type == 'windows'
# assume file is encoded in UTF-8, but warn against BOM
checkEncoding <- function(file) {
# skip *nix because its locale is normally UTF-8 based (e.g. en_US.UTF-8), and
# *nix users have to make a conscious effort to save a file with an encoding
# that is not UTF-8; if they choose to do so, we cannot do much about it
# except sitting back and seeing them punished after they choose to escape a
# world of consistency (falling back to getOption('encoding') will not help
# because native.enc is also normally UTF-8 based on *nix)
if (!isWindows()) return('UTF-8')
size <- file.info(file)[, 'size']
if (is.na(size)) stop('Cannot access the file ', file)
# BOM is 3 bytes, so if the file contains BOM, it must be at least 3 bytes
if (size < 3L) return('UTF-8')
# check if there is a BOM character: this is also skipped on *nix, because R
# on *nix simply ignores this meaningless character if present, but it hurts
# on Windows
if (identical(charToRaw(readChar(file, 3L, TRUE)), charToRaw('\UFEFF'))) {
warning('You should not include the Byte Order Mark (BOM) in ', file, '. ',
'Please re-save it in UTF-8 without BOM. See ',
'http://shiny.rstudio.com/articles/unicode.html for more info.')
return('UTF-8-BOM')
}
x <- readChar(file, size, useBytes = TRUE)
if (is.na(iconv(x, 'UTF-8', 'UTF-8'))) {
warning('The input file ', file, ' does not seem to be encoded in UTF8')
}
'UTF-8'
}
# read a file using UTF-8 and (on Windows) convert to native encoding if possible
readUTF8 <- function(file) {
enc <- checkEncoding(file)
file <- base::file(file, encoding = enc)
on.exit(close(file), add = TRUE)
x <- enc2utf8(readLines(file, warn = FALSE))
tryNativeEncoding(x)
}
# if the UTF-8 string can be represented in the native encoding, use native encoding
tryNativeEncoding <- function(string) {
if (!isWindows()) return(string)
string2 <- enc2native(string)
if (identical(enc2utf8(string2), string)) string2 else string
}
# similarly, try to source() a file with UTF-8
sourceUTF8 <- function(file, envir = globalenv()) {
exprs <- parseUTF8(file)
eval(exprs, envir)
}
parseUTF8 <- function(file) {
lines <- readUTF8(file)
enc <- if (any(Encoding(lines) == 'UTF-8')) 'UTF-8' else 'unknown'
src <- srcfilecopy(file, lines, isFile = TRUE) # source reference info
# oddly, parse(file) does not work when file contains multibyte chars that
# **can** be encoded natively on Windows (might be a bug in base R); we
# rewrite the source code in a natively encoded temp file and parse it in this
# case (the source reference is still pointed to the original file, though)
if (isWindows() && enc == 'unknown') {
file <- tempfile(); on.exit(unlink(file), add = TRUE)
writeLines(lines, file)
}
# keep the source locations within the file while parsing
exprs <- try(parse(file, keep.source = TRUE, srcfile = src, encoding = enc))
if (inherits(exprs, "try-error")) {
stop("Error sourcing ", file)
}
exprs
}
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