Re: Text parsing package

["Yannick Duchêne (Hibou57)" <yannick_duchene@yahoo.fr>]

Le Mon, 28 Mar 2011 10:15:52 +0200, Dmitry A. Kazakov  
<mailbox@dmitry-kazakov.de> a écrit:
>>> 3. As others have mentioned, it is a good idea to abstract the source
>>> formats in order to be able to parse files, strings, streams etc.
>> And Ada already provides a root for that: Ada.Streams.Root_Stream_Type
>
> Unfortunately Root_Stream_Type is not an interface and string cannot be
> inherited from. So in the effect you would need a special root.
I meant implementing a concrete Root_Stream_Type using a string as source.  
You would have an open method, getting a string or any kind of reference  
to string, just not as a filename this time. But wonder about efficiency  
(because of the tagged type), which is important for such low-level and  
heavily iterated stuff. Buffering with systematic batch input/output may  
still be option to reach efficiency, even with a tagged stream type (batch  
often help efficiency I feel).

The advantage is that this would be clean to use, as this may be used  
every where something expect a standard Ada Stream. The disadvantage may  
be the above.

Also can be done with generics, but will not try to advocate it, as when I  
used it, I was not happy with that in the end.

> Yes, it would be nice to have structured multiple co-routines as an
> alternative to FSM. There are some cases where tasks look like an  
> overkill.
I remember I made that wish too (can't remember what was said to advocate  
against it). Let's hope for Ada 2017 or Ada 2022.

-- 
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les chiens.
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