Re: Can one prune the parse stack?

[Christoph Lechner]

Mike Aubury wrote:
> I'm thinking your grammar is probably wrong - there shouldn't be any
> problem with having lots of packets like that - so long and they are
> not very recursive (packet within packet within packet .....)
> What does your grammar look like ?
@Mike: Sorry for sending my first reply to you and not to the list. So
here is my mail to the list.

Hi,

thank you for your fast reply. I think I found the mistake now -- I
guess it's the 'stream' rule.

The beginning of my grammar is like:

stream:   /* empty line */
        | stmt stream
        | error stream
        ;

stmt:     LANGLE assignment_list RANGLE         { /* here the data of the
command is available */ }
        ;

assignment_list:
          assignment
        | assignment SEMIKOLON assignment_list
        ;
[..]

So, I think I identified my mistake. When I remove the top 'stream' rule
and make 'stmt' the new top rule, is it supposed to work then?
As I think about it now, my grammar is more like one does when parsing a
programming language. There, the all the statements as a whole form the
program, so one needs something like my 'stream' rule. But here the
statements are independent, so now I think the 'stream' rule isn't
necessary.

When I make stmt the new top rule, is yyparse supposed to exit (and
clean up), once it parsed a single statement?

Am I correct?

CU
- Christoph