[pypy-dev] Objects and types in the stdobjspace

[holger krekel]

[Armin Rigo Tue, Jun 10, 2003 at 02:13:23PM +0200]

thanks for your answers. reducing the mail to one point ...

> > > def any_list_extend(space, w_list, w_otherlist):
> > >     return space.inplace_add(w_list, w_otherlist)
> > > 
> > > W_ListType.list_extend.register(any_list_extend, W_ANY, W_ANY)
> 
> Not sure how to reduce this, however. I am not too fond of name-based magic.  
> Function attributes would be handy but there is no nice way to define them
> before the body of the function. Docstring-based hacks are bad bad bad. And
> the following has already been (justifiably) rejected as not good-looking and
> requiring quite some metaclass hacks:
> 
> class __magic__(W_ANY, W_ANY):
>     def list_extend(space, w_list, w_otherlist):
>         return space.inplace_add(w_list, w_otherlist)

Evil. 

> One more (really magic too) alternative I could think of is
> 
> def any_list_extend(space, w_list, w_otherlist, __impl__=(W_ANY, W_ANY)):
>     return space.inplace_add(w_list, w_otherlist)

I was thinking more along these lines ...

    def list_extend__any_any(space, w_list, w_otherlist):
        return space.inplace_add(w_list, w_otherlist)

which is bulk-registered at the end of the file like this:

    for name, obj in vars().items():
        if hasattr(obj, 'func_code'):  # or some other selector 
            funcname, sig = name.split('__')
            getattr(space, funcname).register(obj, ssig=sig.split('_'))

cheers,

    holger