[Rd] \U with more than 4 digits returns the wrong character

[Mark van der Loo]

I agree. You could post a documentation bug and a request here:
https://bugs.r-project.org/bugzilla3/

Cheers, Mark

On Thu, Dec 4, 2014 at 8:37 PM, Richard Cotton <richierocks at gmail.com> wrote:
> Great spot, thanks Mark.
>
> This really ought to appear somewhere in the ?Quotes help page.
>
> Having a warning under Windows might be nicer behaviour than silently
> returning the wrong value too.
>
> On 4 December 2014 at 22:24, Mark van der Loo <mark.vanderloo at gmail.com> wrote:
>> Richie,
>>
>> The R language definition [1] says (10.3.1):
>>
>> \Unnnnnnnn \U{nnnnnnnn}
>> (where multibyte locales are supported and not on Windows, otherwise
>> an error). Unicode character with given hex code – sequences of up to
>> eight hex digits.
>>
>>
>> Best,
>> Mark
>>
>> [1] http://cran.r-project.org/doc/manuals/r-release/R-lang.html
>> http://www.markvanderloo.eu
>> -------------------------------------------------------------------
>> If you cannot quantify it,
>> you don't know what you're talking about
>>
>>
>> On Thu, Dec 4, 2014 at 8:00 PM, Richard Cotton <richierocks at gmail.com> wrote:
>>> If I type a character using \U syntax that has more than 4 digits, I
>>> get the wrong character.  For example,
>>>
>>> "\U1d4d0"
>>>
>>> should print a mathematical bold script capital A.  See
>>> http://www.fileformat.info/info/unicode/char/1d4d0/index.htm
>>>
>>> On my machine, it prints the Hangul character corresponding to
>>>
>>> "\Ud4d0"
>>> http://www.fileformat.info/info/unicode/char/d4d0/index.htm
>>>
>>> It seems that the hex-digit part is overflowing at 16^4.
>>>
>>> I tested this on R3.1.2 and devel (2014-12-03 r67101) x64 under
>>> Windows.  I played around with Sys.setlocale and options("encoding"),
>>> but couldn't get the expected value.
>>>
>>> Can others reproduce this?  It feels like a bug, but experience tells
>>> me I probably have something silly going on with my setup.
>>>
>>> --
>>> Regards,
>>> Richie
>>>
>>> ______________________________________________
>>> R-devel at r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-devel
>
>
>
> --
> Regards,
> Richie
>
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