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From: Thomas <fantome.forums.tDeContes@free.fr.invalid>
Subject: Re: Ada and Unicode
Date: Sun, 03 Apr 2022 20:04:36 +0200	[thread overview]
Message-ID: <fantome.forums.tDeContes-E8EAB8.20043603042022@news.free.fr> (raw)
In-Reply-To: s5k0ai$bb5$1@dont-email.me

In article <s5k0ai$bb5$1@dont-email.me>, "J-P. Rosen" <rosen@adalog.fr> 
wrote:

> Le 19/04/2021 à 15:00, Luke A. Guest a écrit :
> > They're different types and should be incompatible, because, well, they 
> > are. What does Ada have that allows for this that other languages 
> > doesn't? Oh yeah! Types!
> 
> They are not so different. For example, you may read the first line of a 
> file in a string, then discover that it starts with a BOM, and thus 
> decide it is UTF-8.

could you give me an example of sth that you can do yet, and you could 
not do if UTF_8_String was private, please?
(to discover that it starts with a BOM, you must look at it.)


> 
> BTW, the very first version of this AI had different types, but the ARG 
> felt that it would just complicate the interface for the sake of abusive 
> "purity".

could you explain "abusive purity" please?

i guess it is because of ASCII.
i guess a lot of developpers use only ASCII in a lot of situation, and 
they would find annoying to need Ada.Strings.UTF_Encoding.Strings every 
time.

but I think a simple explicit conversion is acceptable, for a not fully 
compatible type which requires some attention.


the best would be to be required to use ASCII_String as intermediate, 
but i don't know how it could be designed at language level:

UTF_8_Var := UTF_8_String (ASCII_String (Latin_1_Var));
Latin_1_Var:= String (ASCII_String (UTF_8_Var));

and this would be forbidden :
UTF_8_Var := UTF_8_String (Latin_1_Var);

this would ensures to raise Constraint_Error when there are somme 
non-ASCII characters.

-- 
RAPID maintainer
http://savannah.nongnu.org/projects/rapid/

  parent reply	other threads:[~2022-04-03 18:04 UTC|newest]

Thread overview: 63+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-17 22:03 Ada and Unicode DrPi
2021-04-18  0:02 ` Luke A. Guest
2021-04-19  9:09   ` DrPi
2021-04-19  8:29 ` Maxim Reznik
2021-04-19  9:28   ` DrPi
2021-04-19 13:50     ` Maxim Reznik
2021-04-19 15:51       ` DrPi
2021-04-19 11:15   ` Simon Wright
2021-04-19 11:50     ` Luke A. Guest
2021-04-19 15:53     ` DrPi
2022-04-03 19:20     ` Thomas
2022-04-04  6:10       ` Vadim Godunko
2022-04-04 14:19         ` Simon Wright
2022-04-04 15:11           ` Simon Wright
2022-04-05  7:59           ` Vadim Godunko
2022-04-08  9:01             ` Simon Wright
2023-03-30 23:35         ` Thomas
2022-04-04 14:33       ` Simon Wright
2021-04-19  9:08 ` Stephen Leake
2021-04-19  9:34   ` Dmitry A. Kazakov
2021-04-19 11:56   ` Luke A. Guest
2021-04-19 12:13     ` Luke A. Guest
2021-04-19 15:48       ` DrPi
2021-04-19 12:52     ` Dmitry A. Kazakov
2021-04-19 13:00       ` Luke A. Guest
2021-04-19 13:10         ` Dmitry A. Kazakov
2021-04-19 13:15           ` Luke A. Guest
2021-04-19 13:31             ` Dmitry A. Kazakov
2022-04-03 17:24               ` Thomas
2021-04-19 13:24         ` J-P. Rosen
2021-04-20 19:13           ` Randy Brukardt
2022-04-03 18:04           ` Thomas [this message]
2022-04-06 18:57             ` J-P. Rosen
2022-04-07  1:30               ` Randy Brukardt
2022-04-08  8:56                 ` Simon Wright
2022-04-08  9:26                   ` Dmitry A. Kazakov
2022-04-08 19:19                     ` Simon Wright
2022-04-08 19:45                       ` Dmitry A. Kazakov
2022-04-09  4:05                         ` Randy Brukardt
2022-04-09  7:43                           ` Simon Wright
2022-04-09 10:27                           ` DrPi
2022-04-09 16:46                             ` Dennis Lee Bieber
2022-04-09 18:59                               ` DrPi
2022-04-10  5:58                             ` Vadim Godunko
2022-04-10 18:59                               ` DrPi
2022-04-12  6:13                               ` Randy Brukardt
2021-04-19 16:07         ` DrPi
2021-04-20 19:06         ` Randy Brukardt
2022-04-03 18:37           ` Thomas
2022-04-04 23:52             ` Randy Brukardt
2023-03-31  3:06               ` Thomas
2023-04-01 10:18                 ` Randy Brukardt
2021-04-19 16:14   ` DrPi
2021-04-19 17:12     ` Björn Lundin
2021-04-19 19:44       ` DrPi
2022-04-16  2:32   ` Thomas
2021-04-19 13:18 ` Vadim Godunko
2022-04-03 16:51   ` Thomas
2023-04-04  0:02     ` Thomas
2021-04-19 22:40 ` Shark8
2021-04-20 15:05   ` Simon Wright
2021-04-20 19:17     ` Randy Brukardt
2021-04-20 20:04       ` Simon Wright
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