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Newsgroups: comp.lang.ada
Date: Sun, 30 Dec 2018 21:38:18 -0800 (PST)
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Subject: Re: ANTLR grammar for Ada available
From: alby.gamper@gmail.com
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Xref: reader01.eternal-september.org comp.lang.ada:55132
Date: 2018-12-30T21:38:18-08:00
List-Id: <comp.lang.ada>

On Saturday, December 29, 2018 at 12:38:33 AM UTC+11, Vincent DIEMUNSCH wro=
te:
> Le vendredi 28 d=C3=A9cembre 2018 10:32:49 UTC+1, oliverm...@gmail.com a =
=C3=A9crit=C2=A0:
> > Since ANTLR version 2 is very outdated and the links to v2 grammars are=
 mostly dead, I have resurrected the project on GitHub:
> >=20
> > https://github.com/okellogg/ada_antlr_grammar
> >=20
> > I plan to update the grammar to Ada 202x and ANTLR version 3.
> > (Going to ANTLR v4 straight away looks too earth shaking).
> >=20
> > - Oliver
>=20
> Great Idea Oliver !=20
>=20
> ANTLR v3 is, in my opinion, the way to go, since ANTLR v4 is unduly compl=
ex for a regular language like Ada.
>=20
> But the target language of the ANTLR generator in the GitHub repository i=
s C++... Why not generate an AST for Ada in Ada ? Many Ada compilers are wr=
itten in Ada, in fact.
>=20
> Kind regards,
>=20
> Vincent

Hi Vincent

I would be very interested in your reasoning in saying that ANTLR v4 is mor=
e
complex than V3. In my experience v4 capabilities in auto generating a AST =
and
being able to visit/listen to specific nodes in the AST far surpasses the V=
3
capabilities and make it easier to parse Ada Syntactically at a rudimentary=
 level.
Note I am in no way a ANTLR/Ada expert in this area, but I have used ANTLR =
v4
with my ADA 2012 grammar and used it in "VisualAda" to implement Intellisen=
se
outlining and other intelisense features (albeit very limited at the moment=
).

Feature wise, I believe a well constructed ANTLR v4 grammar is on par with
libadalang (BUT NOT performant with libadalang ?)

Alex