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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Parameterised 'Image Attributes
Date: Fri, 25 Aug 2023 09:26:07 +0200
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On 2023-08-24 21:59, Stephen Davies wrote:
> On Wednesday, 23 August 2023 at 17:16:12 UTC+1, Dmitry A. Kazakov wrote:
>> On 2023-08-23 12:20, Stephen Davies wrote:
>>
>>> Actually, I think it might also be nice if Float'Trim_Image(X) returned
>>> a string that only used exponential notation for very large or very
>>> small values (which seems to be the default behaviour in Python).
>> To use the shortest representation for the given precision unless
>> specified otherwise:
>>
>> http://www.dmitry-kazakov.de/ada/strings_edit.htm#6
>>
>> Ada 'Image attributes have "typographic quality" in plain contradiction
>> to the claim being for debugging purpose. That is why the plus sign is
>> always represented by a space and why floating-point representation is
>> always selected even for exact zero and the way the exponent part is
>> formatted. The typographic idea is to have *same looking* output. Note,
>> even if the output is mathematically incorrect as in the case of
>> floating-point numbers. 'Image considers precision and accuracy same,
>> which is *always* wrong when dealing with floating-point numbers.
>>> Different names would then be needed (Tidy_Image and Tidy_Width?).
>> It takes several parameters to control the behavior in a reasonable way.
>> -- 
> How about an attribute called something like User_Image
> where programmers should make no assumption about the
> generated strings and implementations can provide
> OS-specific ways to customise things like leading
> space/plus/neither, decimal separator character, digit
> grouping character/spacing, exponential notation, enum
> casing, etc.

How anything can be implemented without making assumptions = specifications?

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