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From: DrPi <314@drpi.fr>
Subject: Re: Ada and Unicode
Date: Mon, 19 Apr 2021 11:28:34 +0200
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Le 19/04/2021 à 10:29, Maxim Reznik a écrit :
> воскресенье, 18 апреля 2021 г. в 01:03:14 UTC+3, DrPi:
>>
>> Any way to use source code encoded in UTF-8 ?
> 
> Yes, with GNAT just use "-gnatW8" for compiler flag (in command line or your project file):
> 
> --  main.adb:
> with Ada.Wide_Wide_Text_IO;
> 
> procedure Main is
>     Привет : constant Wide_Wide_String := "Привет";
> begin
>     Ada.Wide_Wide_Text_IO.Put_Line (Привет);
> end Main;
> 
> $ gprbuild -gnatW8 main.adb
> $ ./main
> Привет
> 
> 
>> In some languages, it is possible to set a tag at the beginning of the
>> source file to direct the compiler which encoding to use.
> 
> You can do this with putting the Wide_Character_Encoding pragma (This is a GNAT specific pragma) at the top of the file. Take a look:
> 
> --  main.adb:
> pragma Wide_Character_Encoding (UTF8);
> 
> with Ada.Wide_Wide_Text_IO;
> 
> procedure Main is
>     Привет : constant Wide_Wide_String := "Привет";
> begin
>     Ada.Wide_Wide_Text_IO.Put_Line (Привет);
> end Main;
> 
> $ gprbuild main.adb
> $ ./main
> Привет
> 
Wide and Wide_Wide characters and UTF-8 are two distinct things.
Wide and Wide_Wide characters are supposed to contain Unicode code 
points (Unicode characters).
UTF-8 is a stream of bytes, the encoding of Wide or Wide_Wide characters.
What's the purpose of "pragma Wide_Character_Encoding (UTF8);" ?

> 
> 
>> What's the way to manage Unicode correctly ?
>>
> 
> You can use Wide_Wide_String and Unbounded_Wide_Wide_String type to process Unicode strings. But this is not very handy. I use the Matreshka library for Unicode strings. It has a lot of features (regexp, string vectors, XML, JSON, databases, Web Servlets, template engine, etc.). URL: https://forge.ada-ru.org/matreshka

Thanks
> 
>> Regards,
>> Nicolas