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Re: BISON To Represent BASIC Grammer


From: Valter G. Nogueira Jr.
Subject: Re: BISON To Represent BASIC Grammer
Date: Fri, 23 Apr 2004 10:11:13 -0300

Chris

I didn't answer you because I was away.

I am trying - not sucessfully - to develop a Basic grammar for a while.

Could you tell me where you found the "great post in a newsgroup where
someone has put their yacc/flex implementation of a subset of BASIC in their
post".

Thanks,

Valter

----- Original Message ----- 
From: "Chris Cranford" <address@hidden>
To: "Hans Aberg" <address@hidden>
Sent: Tuesday, April 13, 2004 10:12 PM
Subject: Re: BISON To Represent BASIC Grammer


> Hans -
>
> I looked around a little more detailed since I knew what to be looking for
> and found a great post in a newsgroup where someone has put their
yacc/flex
> implementation of a subset of BASIC in their post.
>
> I followed this as an example and thus far it seems to be working.  So
with
> that said, let me make sure I have an understanding of what I should do.
>
> 1. Develop a way to pass the BASIC file's source to the yyparse()
>    function and detect if the parse is successful or not.
>
> 2. Once the syntax pass #1 is successful, then I need to develop a
>    way to 'interpret' the code and generate a bytecode instruction
>    list of the code and this bytecode should then be stored in a
>    file.
>
> The the bytecode file will get used by the Virtual Machine in order to
> emulate/run the code ...
>
> Right?
>
> Thanks
> Chris
>
> ----- Original Message ----- 
> From: "Hans Aberg" <address@hidden>
> To: "Chris Cranford" <address@hidden>
> Cc: <address@hidden>
> Sent: Tuesday, April 13, 2004 7:07 PM
> Subject: Re: BISON To Represent BASIC Grammer
>
>
> > At 18:34 -0400 2004/04/13, Chris Cranford wrote:
> > >I am trying to write a BASIC-language script bytecode compiler.
Someone
> > >recommended that I use BISON in order to properly parse my .BAS and to
> > >generate my bytecode file.  Has anyone attempted this in the past or
can
> > >offer some assistance?
> >
> > If you do not get any suggestions in this list, I suggest you try the
> > newsgroup comp.compilers and its FAQ published there monthly. Also,
Bison
> > just applies the LALR(1) parsing algorithm, so you might check if there
is
> > already a open source BASIC compiler around with a .y grammar file. If
all
> > that fails, the best way is to get hold of a BASIC grammar from some
> > standard, and then attempt to adapt it for use with an LALR(1) parser
> > generator. And you probably need Flex as well to generate the lexer, see
> > GNU links, and:
> >   Help-flex mailing list
> >   address@hidden
> >   http://mail.gnu.org/mailman/listinfo/help-flex
> >
> >   Hans Aberg
> >
> >
> >
> >
> > _______________________________________________
> > address@hidden http://mail.gnu.org/mailman/listinfo/help-bison
> >
>
>
>
>
> _______________________________________________
> address@hidden http://mail.gnu.org/mailman/listinfo/help-bison





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