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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Bug in Ada - Latin 1 is not a subset of UTF-8
Date: Tue, 18 Oct 2016 10:45:03 +0200
Date: 2016-10-18T10:45:03+02:00	[thread overview]
Message-ID: <nu4nee$18le$1@gioia.aioe.org> (raw)
In-Reply-To: nu4m5k$g7g$1@dont-email.me

On 18/10/2016 10:23, G.B. wrote:
> On 18.10.16 09:41, Dmitry A. Kazakov wrote:
>> On 18/10/2016 01:25, G.B. wrote:
>>> On 17.10.16 22:18, Lucretia wrote:
>>
>>> According to ISO 10646, UTF stands for UCS Transformation
>>> Format. So, it's a format, suggesting a representation.
>>>
>>> On similar grounds, one could define a string subtype for
>>> other types of objects, for example
>>>
>>>   subtype Number_String is String;
>>
>> You are wrong.
>
> The constraints on either UTF_String or or Number_String are
> not expressible as simple Ada subtypes. They are given by
> description and normative reference, respectively.

In the case of UTF-8 it is not a constraint. "Ä" has different 
representations as Latin-1 and UTF-8 strings.

Numeric character is a constraint expressible in Ada:

    subtype Numeric is Character range '0'..'9';

Numeric string constraint is not expressible, but it still a constraint.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de

  reply	other threads:[~2016-10-18  8:45 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-10-17 20:18 Bug in Ada - Latin 1 is not a subset of UTF-8 Lucretia
2016-10-17 20:57 ` Jacob Sparre Andersen
2016-10-18  5:44   ` J-P. Rosen
2016-10-17 23:25 ` G.B.
2016-10-18  7:41   ` Dmitry A. Kazakov
2016-10-18  8:23     ` G.B.
2016-10-18  8:45       ` Dmitry A. Kazakov [this message]
2016-10-18 10:09         ` G.B.
2016-10-18 12:24           ` Dmitry A. Kazakov
2016-10-18 15:10             ` G.B.
2016-10-18 16:35               ` Dmitry A. Kazakov
2016-10-18 17:35                 ` G.B.
2016-10-18 20:03                   ` Dmitry A. Kazakov
2016-10-19  8:15                     ` G.B.
2016-10-19  8:25                       ` G.B.
2016-10-19  8:49                       ` Dmitry A. Kazakov
2016-10-19 14:20                         ` G.B.
2016-10-19 16:20                           ` Dmitry A. Kazakov
2016-10-20  0:31         ` Randy Brukardt
2016-10-20  7:36           ` Dmitry A. Kazakov
2016-10-21 12:28             ` G.B.
2016-10-21 16:13               ` Lucretia
2016-10-21 16:43                 ` Dmitry A. Kazakov
2016-10-22  5:51                   ` G.B.
2016-10-22  7:49                     ` Dmitry A. Kazakov
2016-10-24 11:35                       ` Luke A. Guest
2016-10-24 13:01                         ` Dmitry A. Kazakov
2016-10-24 14:54                           ` Luke A. Guest
2016-10-22  1:53             ` Randy Brukardt
2016-10-28 21:08         ` Shark8
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