Re: [boost] Re: [ANN] Spirit C++ parser framework

From: Reuben Fries (reuben_at_[hidden])
Date: 2001-05-22 08:57:11

----- Original Message -----
From: "joel de guzman" <joel_at_[hidden]>
To: <boost_at_[hidden]>
Sent: Tuesday, May 22, 2001 6:40 AM
Subject: Re: [boost] Re: [ANN] Spirit C++ parser framework

> You have a point though with the + op. Right now Spirit
> uses the prefix + (for one or more), the prefix * (for zero
> or more). Infix + for sequencing? Hmmm... Well C++ uses
> the infix plus for mult and the prefix for deref.
>
> Comments?
>
> [ snip ]
>
> Joel de Guzman
>

I'm kind of ignorant on this topic... so I apologize if my suggestion is
actually invalid.  Would it be possible to get rid of the * and + prefixes,
and add a range postfix?

You would do:

Rule<> a, b;

a = b(0,1) + a;

instead of a = b >> !a

negative values would be "infinity" so you would do

a = b(0,-1) + a
instead of a = b >> *a

and

a = b(1,-1) + a
instead of a = b >> +a

-Reuben