Regex in ctfe?

[H. S. Teoh via Digitalmars-d]

On Wed, Jan 27, 2016 at 07:54:21PM +0000, Era Scarecrow via Digitalmars-d wrote:
> On Wednesday, 27 January 2016 at 19:05:01 UTC, H. S. Teoh wrote:
> >An alternative would be to use `if (_ctfe)` branches in the code to
> >switch to a different matching engine when in CTFE, and leaving the
> >runtime code untouched.
> 
>  Hmmm... As I recall there's 2 major engines that run Regex (DFA &
>  NFA). If you don't need the more complex engine (which has
>  forward/back referencing, named capturing, etc) then maybe the
>  simpler engine would work.
> 
>  But it would seem easier/simpler if the compiler just hooks in the
>  Regex that's compiled into it instead and passes the data back and
>  forth. It does mean you can't test Regex changes during the CTFE
>  stage (assuming your actively changing/building it) but it wouldn't
>  have the performance hit either.

Currently, AFAIK, (d)dmd does not use anything from Phobos. I'm not sure
if this is a temporary situation, or there's a strong reason for it.


T

-- 
Those who don't understand D are condemned to reinvent it, poorly. -- Daniel N