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Date: Mon, 31 Dec 2018 04:32:48 -0800 (PST)
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Subject: Re: ANTLR grammar for Ada available
From: Vincent DIEMUNSCH <vincent.diemunsch@gmail.com>
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Xref: reader01.eternal-september.org comp.lang.ada:55139
Date: 2018-12-31T04:32:48-08:00
List-Id: <comp.lang.ada>

Le lundi 31 d=C3=A9cembre 2018 06:38:20 UTC+1, alby....@gmail.com a =C3=A9c=
rit=C2=A0:
> Hi Vincent
>=20
> I would be very interested in your reasoning in saying that ANTLR v4 is m=
ore
> complex than V3. In my experience v4 capabilities in auto generating a AS=
T and
> being able to visit/listen to specific nodes in the AST far surpasses the=
 V3
> capabilities and make it easier to parse Ada Syntactically at a rudimenta=
ry level.

Hi Alex,

You are certainly right about the quality of the generated AST, superior in=
 V4. My point was simply that, from a pure parser perspective, the ability =
of backtracking and memorizing previous attempts, as it is done in V4, alth=
ough more powerful, is not necessary for parsing the Ada language. Hence it=
 seemed to me perfectly reasonable to stay in V3 for Ada, if the runtime su=
pport already exists.

But if the advantage of a better AST is really big, then developing an Ada =
runtime for ANTLR V4 may be the best choice :-).

Regards,

Vincent