Re: Parsing from continuous stream

[Daniel Kraft]

> > I'm trying to use GNU bison to parse from a "continuous" stream, that is, I 
> > do want to implement a program similar to a shell:  parse one "command" at 
> > a time, process it, and continue until end-of-stream is encountered.
> >
> > However, I do want my parser to return the parsed tree to the calling 
> > program to process it on each step, so ideally I'd like bison to return 
> > from yyparse() when a complete instance of the start symbol is read, but it 
> > seems it does not do this (waits for special 0-token, as far as I found 
> > out)--to counter-act, I currently do something like this:
> >
> > start_symbol:
> >   real_start_symbol
> >   {
> >     storeValueForProcession($1);
> >     YYACCEPT;
> >   }
> > ;
>
> Aha, Yes!
>
> Use the push parser that I have just implemented in Bison. You will be
> the first beta tester. The documentation should be in CVS and you need a
> CVS version of bison.

Thanks for the hint, it looks neat as far as I have seen yet!  But I'm 
not yet sure how this will help me exactly; will yypush_parse return 
without this YYPUSHMORE whenever it encounters the start symbol (or any 
symbol?), so I can process it in my code and continue calling 
yypush_parse afterwards, with the state including all look-ahead conserved?

BTW, how does one bootstrap the autotools stuff for bison?  Trying 
myself with aclocal; automake -a; autoheader; autoconf (like this) gives 
me errors in the resulting configure related to gl_* symbols; I suspect 
that autoconf is missing some m4-files or the like?

Cheers,
Daniel


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