On Thu, 2007-03-29 at 23:13 -0700, Erick Tryzelaar wrote:
> skaller wrote:
> > However I see no problem: just copy the array. The hard part is
> > knowing how long to make the C array for tre .. only tre knows
> > how many groups there are. Note that tre will not exceed the
> > specified array length .. you just lose the trailing groups.
> >
> > I think there's a way to find how many groups there are in a
> > compiled regex, isn't there?
> >
>
> Yeah, I believe it's the function "nsub". tre_regexec already returns
> that along with the matches, so it'd be pretty easy to make the varray.
Er no, the problem is you need the nsub value BEFORE you actually
do a regexp, otherwise you can't tell how long the array needs to be
to hold the matches.
> I'll also add some ctors so it'll be a little easier to use than the
> not-exactly-obvious constructors mkiv and mkuiv. Should be pretty simple
It isn't .. otherwise I would have already done it :)
Also, varray access should probably be made safe, the way Ocaml
does it: if you use
s.[i]
notation it should be bounds checked, if you want fast access then
you have to use functions like 'get_elt s i'.
The problem is that in
s.[i]=x;
s.[i] must be an lvalue, and Felix functions cannot accept or
return lvalues (only primitives can do that).
> >> And speaking of data structures, what should we use as our default
> >> return type? varrays or lists?
> >>
> >
> > Probably a varray. The reason is Posix defines subgroups by integers.
> > It's not very nice, but that's the price for dynamic string regexps.
> >
>
> What do you think for in general?
I don't understand what you mean 'in general' :)
--
John Skaller <skaller at users dot sf dot net>
Felix, successor to C++: http://felix.sf.net
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