Problems with encoding (with non-ASCII chars)

[vh-d]

I run into encoding issues when parsing files as well as R characters.

Parsing from text (R characters):

> test_input <- enc2utf8("value='Žluťoučký kůň'")
> Encoding(test_input)
[1] "UTF-8"
> test_output <- RcppTOML::parseTOML(test_input, fromFile = FALSE)$value
> cat(test_output)
Žluťoučký kůň
> Encoding(test_output)
[1] "unknown"

The encoding attribute is lost. But may be set again

> Encoding(test_output) <- "UTF-8"
> cat(test_output)
Žluťoučký kůň

Parsing from files

Example: test.txt

> test_file <- RcppTOML::parseTOML("test.txt
")
> test_file$value
[1] "Ĺ˝luĹĄouÄŤkĂ˝ kĹŻĹ\u0088"
> Encoding(test_file$value)
[1] "unknown"
> Encoding(test_file$value) <- "UTF-8"
> test_file$value
[1] "Žluťoučký kůň"

TOML files are assumed to be UTF-8 Unicode texts. However R characters obtained from parsing via parseTOML() are labeled as "unknown" encoding.

In case of files, the solution may be relatively easy, I think. We can assume that input is UTF-8 and label every string output as "UTF-8".

[eddelbuettel]

Just to double check: what platform are you on?

[vh-d]

Good point, this was Windows 2008. I will check Linux in few hours and report back.

[eddelbuettel]

In a way that's good -- Windows seems to be the worst. So if Encoding() covers it there we should be good on the others (who may already be good).

[vh-d]

On Linux:

Parsing character value:

> test_input <- enc2utf8("value='Žluťoučký kůň'")
> Encoding(test_input)
[1] "UTF-8"
> test_output <- RcppTOML::parseTOML(test_input, fromFile = FALSE)$value
> cat(test_output)
Žluťoučký kůň
> Encoding(test_output)
[1] "unknown"
> Encoding(test_output) <- "UTF-8"
> cat(test_output)
Žluťoučký kůň

and parsing files:

> test_file <- RcppTOML::parseTOML("~/Downloads/test.txt")
> test_file$value
[1] "Žluťoučký kůň"
> Encoding(test_file$value)
[1] "unknown"
> Encoding(test_file$value) <- "UTF-8"
> test_file$value
[1] "Žluťoučký kůň"

So the problem persists (lost encoding attribute) but the consequences are negligible because "unknown" encoding on modern linux is "UTF-8" anyway.

[vh-d]

I suggest

• conversion to UTF-8 via enc2utf8() for every input whenever fromFile=FALSE and
• labeling every character on output as "UTF-8"

The first would solve non-file input. The second would solve both file and non-file inputs given that user is assumed to provide UTF-8 files by TOML spec.

[eddelbuettel]

Sounds good. Also see #20 which is pretty much the same, no?

[vh-d]

Yeah, sorry about that. I will try to come up with a pull request soon as this bug bites my application quite a bit.

[eddelbuettel]

That's ok. You are being careful, and you are constructing good examples. One change at a time...

[eddelbuettel]

Ok, I just pushed a PR with a change I had following the 0.1.4 release. I'd like to make one more change in there and properly document your last change -- see ChangeLog which is a standard (older) format well supported by Emacs :) Can you drop me a full name please, either here or if you prefer by email? And if you want an email different from the one used by git log. Thanks! The 0.1.5 release some time next week will be much improved thanks to your help.

[vh-d]

Can you drop me a full name please, either here if you prefer by email? And if you want an email different from the one used by git log.

My name is Václav Hausenblas, nice to meet you :-) Big fan of tinyverse, btw.

Thanks! The 0.1.5 release some time next week will be much improved thanks to your help.

My pleasure! I am going to play with encoding now...

[eddelbuettel]

Ok, you're in the ChangeLog now :) And I got my other issue taken care of -- the (new in 0.5.0) local_time type comes back to us now too (as a string, there is no real type for it and I don't think I want to pull in hms just for this).

So if/when you something for encoding feel free to branch or fork again and show it :)

[eddelbuettel]

Fixed in #30