Re: [ANN] Spirit C++ parser framework

From: Vladimir Prus (ghost_at_[hidden])
Date: 2001-05-21 10:12:47

Vesa Karvonen wrote

> > This is interesting, but probably is not usefull.
> > With small grammars this might work,

> This is exactly the reason why I completely disagree on the usefulness
> point. 

> [snip]

> Now lets turn the comment into pseudo code:

>     istream& operator>>(istream& s, complex& a)
>     {
>         Terminal<double> re, im;
>         Parser parser = re
>                       | '(' + re + ')'
>                       | '(' + re + ',' + im +')'
>                       ;

>         s >> parser;

>         return complex(re,im);
>     }

> The above pseudo code is something I dreamed in early 1999.

Well, this is nice. However, it seems like the grammar here is not LL(1). Am 
I wrong? If I right, how this is supposed to work. 

> > Template metaprograms are very hard to write, debug and use.

> True, but the problems are solvable and the benefits are clear.

I would like to see working implementation that can handle syntax that you've 
given a few lines above.

-- 
Regards,
Vladimir