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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Running a preprocessor from GPS?
Date: Thu, 30 Jul 2015 15:38:15 +0200
Organization: cbb software GmbH
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Date: 2015-07-30T15:38:15+02:00
List-Id: <comp.lang.ada>

On Thu, 30 Jul 2015 06:21:42 -0700 (PDT), EGarrulo wrote:

> On Thursday, July 30, 2015 at 2:42:36 PM UTC+2, Pascal Obry wrote:
>> Le jeudi 30 juillet 2015 à 04:54 -0700, EGarrulo a écrit :
>>> By the way, the implementation of GNAT.Formatted_String is cryptic.
>>> Isn't Ada code supposed to be readable? 
>> 
>>> I must be missing something.
>> 
>> Yes, sure: Open Mind score below 0!
> 
> Not really.  Compare the arbitrary overloading of "+", "-" and
> "&" (and the cryptic "#") in GNAT.Formatted_String here:
> 
>   procedure Fout is
>      F  : Formatted_String := +"%c %% %#08x";
>      Vc : Character := 'v';
>      Vi : Integer := 12;
>   begin
>      F := F & Vc & Vi;
>      Put_Line (-F); -- Prints: "v % 0x00000c"
>   end Fout;
> 
> with the explicit formatting directives here (I am not sure that
> this is valid Ada, but you should get the idea):
> 
>   procedure Fout is
>      F  : Formatted_String;
>      Vc : Character := 'v';
>      Vi : Integer := 12;
>   begin
>      F := ("%A %% %A", (Format (Vc), 
>                         Format (Vi,
>                                 Prefix => "0x"                                
>                                 Base => 16,
>                                 Width => 8,
>                                 Filler => "0"));
>      Put_Line (F); -- Prints: "v % 0x00000c"
>   end Fout;
> 
> The only convention that you need to know is that "%A" inserts
> an argument and that "%%" inserts a literal "%".  Much simpler,
> don't you think?  And extensible!  You can define "Format"
> for your own types, independently from "Formatted_String".

declare
   Text : String (1..40);
   Pointer : Integer := Text'First;
begin
   Put (Text, Pointer, Vc & " % 0x");
   Put (Text, Pointer, Vi, Base=>16,Fill=>'0',Field=>6,Justify=>Right);
   Put_Line (Text, 1..Pointer - 1);

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