Re: anything more convenient then bison/yacc?

Hi,


(Comments below)


Valery wrote:


> Hi all,
>
> I am wondering if there are some newer reliable engines
> similar to yacc/bison, but with more syntactic sugar and
> wider class of the grammars.
>
> In particular some ideas/notions of regular expression
> would be fine. For example, something like:
>
> e? Matches element e in brackets zero or one times
> e* Matches element e in brackets zero or more times
> e+ Matches element e in brackets one or more times
> e{num} Matches element e in brackets num times
> e{min, max} Matches element e in brackets at least min times, but
> not more than max times


I'm working on one that uses


        e? or [e] Zero or one.
        e* or {e} Zero or more.
        e+ One or more. (Could see a good bracket form.)


>
> where element e might be a compound elemnt embraced, say,
> in brackets if needed.


        I use (e).


>
> Absence of this sugar makes the grammar description
> less readable.


I wanted to be able to enter grammars that are similar to those
published for languages.


I also allow := as a synonym for : and . as a synonym for ;


>
> Consider this short example (BTW it comes from real life):
>
> [example]
> Rule: [a [b?a]* b? ]?
> [/example]


This would be:


          Rule: (a (b?a)* b?)?;


in mine.


[Yacc example snipped]


> Thus, any testimonials to reliable grammar parser generators
> are very appreciated. (Commercial implementatios are
> less considered). In particular, recommendations to
> free implementations from this list:
>
> http://www.programming-x.com/programming/parser.html
>
> would be very interesting as well.
>
> Best regards,
> thank you in advance,
> Valery A.Khamenya


Unfortunately, mine is a personal project that I've been working on. I'm
not sure it it will ever be available, but I'm having a lot of fun
writing it.


You can find more information on it on my web site.


Best regards,


Rich
--
Richard Pennington
Email: rich@pennware.com
http://www.pennware.com ftp://ftp.pennware.com

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