[antlr-interest] Re: ANTLR 3.0 question about common actions
Terence Parr
parrt at cs.usfca.edu
Thu Jul 29 16:56:36 PDT 2004
On Jul 29, 2004, at 4:39 PM, thrutchy wrote:
> --- In antlr-interest at yahoogroups.com, Terence Parr <parrt at c...> wrote:
>> Yep, i'm hoping that the new output code will be easier to read. It
>> seems so already. Definitely want a grammar, but we need to make the
>> output very understandable. Heh, at least it's code...most systems
>> generate tables. :) That's my "secret sauce" that many tools don't
>> seem to get ;)
>
> I'm glad to hear this. Just to let you know one perspective of the
> reasons for choosing antlr over other, here are my reasons:
>
> - lexer and parser have almost identical grammars. I wanted to get up
> and running quickly
> - understandable generated code - extremely useful for debug and
> getting around issues
> - supported several target languages I was interested in
Cool :)
> One of the things that frustrates me the most is that antlr only uses
> the linear lookahead scheme, when others could be used sometimes to
> resolve ambiguities. I'm also glad to here that ANTLR 3 is going to
> be smart enough to do infinite lookahead to resolve ambiguities when
> necessary.
That the linear approx lookahead is annoying sometimes...an expedient
given my time constraints in the jGuru start-up days. :(
ANTLR 3 should make up for my sins, however. This thing is so clean I
can barely stand it. :)
Ter
--
CS Professor & Grad Director, University of San Francisco
Creator, ANTLR Parser Generator, http://www.antlr.org
Cofounder, http://www.jguru.com
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