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Re^5: Compiling Regular Expressions

by hv (Parson)
on Feb 19, 2003 at 14:43 UTC ( #236646=note: print w/replies, xml ) Need Help??

in reply to Re^4: Compiling Regular Expressions
in thread Compiling Regular Expressions

It should also be noted that study() is not as well tested in perl as it ought to be, and as a result changes to the regexp engine over the years have managed to introduce various problems that cause study() not to gain as much speed as it should, and in some cases even give the wrong answer.

In particular, I don't think study() knows anything about Unicode (though I haven't checked).

The plan is that 5.10.0 should involve a big cleanup of the regexp engine, so this may improve in the future.


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[ambrus]: what push_write thing? I don't think you need that. that's implemented generically by AnyEvent::Handle
[Corion]: ambrus: Yeah, that's what I think as well. But you give me an idea, maybe I should start with implementing the timer, as that should be far simpler and with fewer edge-cases/nasty interaction than the file watcher
[ambrus]: You only provide the watcher part that tells when the handle is readable or writable, not the actual writing and reading.
[Corion]: ambrus: Hmmm. It makes sense that AnyEvent would implement the push_write itself, but I think I don't have a good idea of where the boundary between AnyEvent and the underlying event system lies... Implementing the timer should give me a better idea
[ambrus]: Corion: push_write is in the higher level abstraction of AnyEvent::Handle, not in the watcher
[Corion]: ambrus: Hmm - rereading Prima::File, that merrily coincides with what Prima does - it tells you "you can read", and you're supposed to read from the fh yourself. I thought it called you with the data already read, which would've been harder to integrate
[ambrus]: you just need an io watcher, created by &AnyEvent::Impl:: Whatever::io(...)
[Corion]: So after talking it through with you even while I'm still not entirely clear on where AE ends and my implementation begins, I think I understand that I only need to implement some smaller parts for each functionality I want to support.
[Corion]: Yeah... and you might even be able to mix and match additional functionality if you have additional async suppliers, like from a separate thread
[ambrus]: You hvae to be careful with the timer, because apparently Prima::Timer insists on being periodic, wheras AnyEvent::Impl:: Whatever::timer should give a one-shot timer watcher

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