Re: Parser base class (lalr1)

[Jan Nabbefeld]

Hello,
On 28.09.2005, Hans Aberg wrote:
> On 28 Sep 2005, at 14:37, Jan Nabbefeld wrote:
> I use a C++ polymorphic hierarchy, with a reference count at the  
> base, in order to avoid unnecessary copying.
> This approach has also the advantage of making use of C++ cleanup
> The code above then becomes:
>
> cd_list: /* empty */ {$$=0;}
>     | cd_list cd { $$ = new NRec(token, _CD_LIST, $1, $2, _CD); }
> ;
> [snip]

That's a nice solution but unfortunately no option for me. As I
mentioned, there is no way for me to change the semantic actions. My
mission is to rebuild an existing C implemented scanner/parser in C++.
The semantic actions have to be untouched (as far as possible). 

> >I know lalr1.cc skeleton is experimantal and not supported so I  
> >don't complain about that. Would be nice to have the possibility  
> >again without customize the skeleton.
> When Akim has finished the writing of %define, customizing will be
> easy.

Whats the plan? Can you give some details? The idea of defining code
snippets via the %defines statements sounds good and was nicely
implemented by %define root ... (at least for me ;-)).