From: Mario Amado Alves <maa@di.fct.unl.pt>
To: comp.lang.ada@ada.eu.org
Subject: RE: very specific question on Ada syntax
Date: Mon, 29 Jan 2001 11:11:01 +0000 (WET)
Date: 2001-01-29T11:11:01+00:00 [thread overview]
Message-ID: <mailman.980766440.11889.comp.lang.ada@ada.eu.org> (raw)
In-Reply-To: <94vpi8$lrc$1@nnrp1.deja.com>
"Restriction:
no one-character attribute designators.
Conjecture:
that restriction is necessary in order to tokenize a
character_literal without semantic or syntactical analysis."
(Alves, revised)
"Since the truth of this depends on your arbitrary definition
of what is and what is not syntactical analysis [...]"
(Dewar)
Syntactical: ranging more than one lexical element. A lexer may be purely
morphological, i.e. based solely on the individual form of each element.
But that is rare. An Ada lexer must have some syntax---so the conjecture is
true!
"[..] properly written lexical analyzers for Ada solve this" (Dewar)
It is nice to know my personal lexer is "proper" apud Dewar :) Excerpt:
when ''' =>
if Previous_Kind = Identifier
or (Previous_Kind = Delimiter and To_String(Previous_Form)=")")
or Previous_Kind = Reserved_Word_All
then
Send(Delimiter, C);
else
State := Character_Literal_1;
end if;
And I was surprised much hyped systems (OpenToken, AdaGIDE...) fail this!
Thanks.
| |,| | | |RuaFranciscoTaborda24RcD 2815-249CharnecaCaparica 351+939354005
|M|A|R|I|O|
|A|M|A|D|O|DepartmentoDeInformaticaFCT/UNL 2825-114 Caparica 351+212958536
|A|L|V|E|S| fax 212948541
| | | | | | maa@di.fct.unl.pt FCT 212948300
next prev parent reply other threads:[~2001-01-29 11:11 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200101261211.NAA13016@bulgaria.otn.eurocopter.de>
2001-01-26 17:17 ` very specific question on Ada syntax Mario Amado Alves
2001-01-28 0:36 ` Robert Dewar
2001-01-29 11:11 ` Mario Amado Alves [this message]
2001-01-29 15:55 ` Ted Dennison
2001-01-29 16:41 ` Ted Dennison
2001-01-29 17:52 ` Mario Amado Alves
2001-01-30 6:26 ` Robert Dewar
[not found] <mailman.980516658.10759.comp.lang.ada@ada.eu.org>
[not found] ` <94s4vm$qr4$1@nnrp1.deja.com>
2001-01-26 20:26 ` Florian Weimer
2001-01-28 0:28 ` Robert Dewar
2001-01-30 8:47 ` Florian Weimer
2001-01-30 18:35 ` Robert Dewar
2001-01-30 22:16 ` Florian Weimer
2001-01-31 6:10 ` Robert Dewar
2001-01-31 13:29 ` Florian Weimer
2001-01-31 14:40 ` Marc A. Criley
2001-01-26 22:43 ` Paul Graham
2001-01-28 0:32 ` Robert Dewar
2001-01-30 6:28 Christoph Grein
2001-01-30 7:16 ` Jean-Pierre Rosen
2001-01-30 16:25 ` Mario Amado Alves
2001-01-30 17:57 ` Robert Dewar
2001-01-30 19:16 ` Ted Dennison
2001-01-31 6:16 ` Robert Dewar
2001-01-31 11:40 ` Mario Amado Alves
2001-01-31 22:09 ` Florian Weimer
2001-02-01 5:39 ` Robert Dewar
2001-02-01 5:39 ` Robert Dewar
2001-02-04 14:24 ` Florian Weimer
2001-02-01 5:38 ` Robert Dewar
2001-02-01 18:24 ` Mario Amado Alves
2001-02-02 3:52 ` Robert Dewar
2001-01-30 19:06 ` Ted Dennison
2001-01-31 6:18 ` Robert Dewar
2001-01-30 18:41 ` Robert Dewar
-- strict thread matches above, loose matches on Subject: below --
2001-01-30 7:19 Jean-Pierre Rosen
2001-01-30 9:30 Christoph Grein
[not found] <B6A1A9B09E52D31183ED00A0C9E0888C4699C9@nctswashxchg.nctswash.navy.mil>
[not found] ` <mailman.980504596.2748.comp.lang.ada@ada.eu.org>
2001-01-26 16:17 ` Paul Graham
2001-01-26 16:38 ` Robert Dewar
2001-01-30 16:45 ` Tucker Taft
2001-01-31 5:01 Christoph Grein
2001-01-31 6:02 ` Robert Dewar
2001-02-01 5:52 Christoph Grein
2001-02-01 6:25 ` Robert Dewar
2001-02-01 9:21 ` Keith Thompson
2001-02-01 7:14 Christoph Grein
2001-02-01 11:10 Christoph Grein
2001-02-01 17:58 ` Robert Dewar
2001-02-02 5:53 Christoph Grein
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