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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: for S'Image use Func??
Newsgroups: comp.lang.ada
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Date: Tue, 11 May 2010 18:59:51 +0200
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Date: 2010-05-11T18:59:48+02:00
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On Tue, 11 May 2010 17:23:44 +0200, Yannick Duch�ne (Hibou57) wrote:

> Le Tue, 11 May 2010 10:26:02 +0200, Dmitry A. Kazakov  
> <mailbox@dmitry-kazakov.de> a �crit:
>>> But you have no way to know when you've read
>>> a empty line in a lexer routine that is reading
>>> character by character.
>>
>> A lexer routine shall never do that. You either read lines and then parse
>> them, or else you do stream input and the line end is to be determined by
>> the lexer (i.e. by the language being parsed).
> With all due respect, really don't agree with that. A lexer is not  
> required to be line oriented.

Most languages I know are line oriented. Ada is, C++ is. Even bash is. If
the language had no lines, no comments like //, ignored LF, how would you
report errors? As numbers of Unicode code points from the beginning of the
source file?

BTW, a pure stream lacks not only EOL, but also EOF. So a truly
stream-oriented program must be infinite. (:-))

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