Character classes in Parrot
Patrick R. Michaud
character classes-- things like isspace, isupper, islower, etc?
I searched around a bit in the docs, online references, and P6PE
and found very little about it.
How about for creating and manipulating character classes?
Apologies in advance if I've simply overlooked something.
Pm
Leopold Toetsch
> Does Parrot have anything available (yet?) for testing membership in
> character classes-- things like isspace, isupper, islower, etc?
RSN or when Dan's string stuff is merged.
> How about for creating and manipulating character classes?
There is an implementation of bit sets in imcc/sets.c. The old rx code
has some bitmap stuff in src/rx.c. But that's broken WRT memory leaks.
It uses a bitmap for chars < 256 and a linear string for anything bigger
- suboptimal.
So it's probably best to to create a BitSet PMC. That could use a bitset
for the "normal" range of the charset and an additional hash for other
values, which is searched only if it's there.
> Apologies in advance if I've simply overlooked something.
No problem, the source tree is huge.
> Pm
leo
Dan Sugalski
>Does Parrot have anything available (yet?) for testing membership in
>character classes-- things like isspace, isupper, islower, etc?
>I searched around a bit in the docs, online references, and P6PE
>and found very little about it.
Not yet. I've got some basic code in the new string branch to provide
a few checks (whitespace, alpha, number, and punctuation) but that's
it for now.
>How about for creating and manipulating character classes?
Nope, not yet. Character classes do need to be addressed, though,
since they're... interesting to handle.
--
Dan
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