Re: Ada and Unicode

[DrPi <314@drpi.fr>]

Le 19/04/2021 à 11:08, Stephen Leake a écrit :
> DrPi <314@drpi.fr> writes:
> 
>> Any way to use source code encoded in UTF-8 ?
> 
>        for Switches ("non_ascii.ads") use ("-gnatiw", "-gnatW8");
> 
That's interesting.
Using these switches at project level is not OK. Project source files 
not always use the same encoding. Especially when using libraries.
Using these switches at source level is better. A little bit complicated 
to use but better.

> from the gnat user guide, 4.3.1 Alphabetical List of All Switches:
> 
> `-gnati`c''
>       Identifier character set (`c' = 1/2/3/4/8/9/p/f/n/w).  For details
>       of the possible selections for `c', see *note Character Set
>       Control: 4e.
> 
> This applies to identifiers in the source code
> 
> `-gnatW`e''
>       Wide character encoding method (`e'=n/h/u/s/e/8).
> 
> This applies to string and character literals.
> 
>> What's the way to manage Unicode correctly ?
> 
> There are two issues: Unicode in source code, that the compiler must
> understand, and Unicode in strings, that your program must understand.
> 
> (I've never written a program that dealt with utf strings other than
> file names).
>   
> -gnati8 tells the compiler that the source code uses utf-8 encoding.
> 
> -gnatW8 tells the compiler that string literals use utf-8 encoding.
> 
> package Ada.Strings.UTF_Encoding provides some facilities for dealing
> with utf. It does _not_ provide walking a string by code point, which
> would seem necessary.
> 
> We could be more helpful if you show what you are trying to do, you've
> tried, and what errors you got.
>