[Haskell-cafe] Re: Strings and utf-8
jules at jellybean.co.uk
Thu Nov 29 08:05:19 EST 2007
Duncan Coutts wrote:
> On Wed, 2007-11-28 at 17:38 -0200, Maurício wrote:
>>>> (...) When it's phrased as "truncates to 8
>> >> bits" it sounds so simple, surely all we need
>> >> to do is not truncate to 8 bits right?
>> >> The problem is, what encoding should it pick?
>> >> UTF8, 16, 32, EBDIC? (...)
>> >> One sensible suggestion many people have made
>> >> is that H98 file IO should use the locale
>> >> encoding and do Unicode/String <-> locale
>> >> conversion. (...)
>> I'm really afraid of solutions where the behavior
>> of your program changes with an environment
>> variable that not everybody has configured
>> properly, or even know to exist.
> Be afraid of all your standard Unix utils in that case. They are all
> locale dependent, not just for encoding but also for sorting order and
> the language of messages.
Language of messages is quite different from language of a file you read.
Suppose I am English, and I have a russian friend, Vlad.
My default locale is, say, latin-1, and his is something cyrillic.
I might well open files including my own files, and his files. The
locale of the current user is simple no guide to the correct encoding to
read a file in, and not a particularly reliable guide to writing a file out.
Locale makes perfect sense for messages (you are communicating with the
user, his locale tells you what language he speaks). It makes much less
sense for file IO.
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