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From: "J-P. Rosen" <rosen@adalog.fr>
Newsgroups: comp.lang.ada
Subject: Re: for S'Image use Func??
Date: Wed, 12 May 2010 07:00:14 +0200
Organization: Adalog
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Date: 2010-05-12T07:00:14+02:00
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Warren a �crit :
> J-P. Rosen expounded in news:hsb97m$tnd$1@news.eternal-september.org:
> 
>> Dmitry A. Kazakov a �crit :
>>> On Mon, 10 May 2010 18:50:02 +0000 (UTC), Warren wrote:
>>>
>>>> But you have no way to know when you've read 
>>>> a empty line in a lexer routine that is reading 
>>>> character by character. 
>> Come on, here is the magic function:
>>
>> function Empty_Line return Boolean is
>> begin
>>    return Col=1 and End_Of_Line;
>> end Empty_Line;
> 
> There's a wart-- see earlier posts about "end file".
> 
Of course, this assumes an well-formed Ada file.
FYI, there /is/ a scanner in AdaControl, and I never had a problem.
The trick is to check End_Of_Line when needed, and never check
End_Of_File, but handle End_Error instead. This works even for
ill-formed files.

And of course, you are welcome to have a look at my scanner in
AdaControl ;-)
-- 
---------------------------------------------------------
           J-P. Rosen (rosen@adalog.fr)
Visit Adalog's web site at http://www.adalog.fr