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".

Warren