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From: Ted Dennison <dennison@telepath.com>
Subject: Re: Ayacc/Aflex "entropy" (P2Ada)
Date: 1999/10/25
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References: <3813716C.52655126@Maths.UniNe.CH>
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In article <3813716C.52655126@Maths.UniNe.CH>,
  Gautier <Gautier.deMontmollin@Maths.UniNe.CH> wrote:
> to extend P2Ada for the Borland-ish Pascal language
> "nebula" increases the "Reduce/Reduce conflicts"
> (what does it mean? nothing good surely...)
> and can confuse the translator in unexpected way.
>
> - Is there a strategy to avoid it (I'm completely
>   amateur in ayacc) ?

You ought to consider getting a good yacc book. I use the O'Reilly
Lex/Yacc nutshell book, and it seems quite good. It has a whole chapter
on Yacc conflicts that you might find most helpful. (Reduce/Reduce
roughly means a series of tokens matches 2 rules and it can't decide
which to use).

> - Should one "migrate" to a replacement of ayacc ?
>
> - If so, is there an automatic way to translate
>   Pascal.Y ?...

Within a couple of months I hope to get OpenToken (
http://www.telepath.com/dennison/Ted/OpenToken/OpenToken.html ) to a
point where it would be a useful alternative for such projects. As it
stands now, you'd have to do you own parsing, though.

--
T.E.D.


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