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Re: master ea93326: Add `union' and `intersection' to rx (bug#37849)
From: |
Stefan Monnier |
Subject: |
Re: master ea93326: Add `union' and `intersection' to rx (bug#37849) |
Date: |
Fri, 13 Dec 2019 12:13:19 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) |
> An interesting suggestion, but exactly how would that model work? Consider:
>
> (rx-define ident-chars (any "a-z0-9"))
> (rx-define op-chars (any "+*/" ?-)
>
> To form the union of the two, 'any' needs to be allowed inside 'union':
>
> (any (union ident-chars op-chars))
Indeed to avoid this, we'd have to do something like
(rx-define-charset ident-chars "a-z0-9")
(rx-define-charset op-chars (union "+*/" ?-))
and then
... (any (union ident-chars op-chars)) ...
Is it worth the trouble?
> Speaking of 'or', we still haven't figured out what to do about regexp-opt
> in rx. Currently, the answer is something like
> (eval (regexp-opt STRINGS)), which isn't ideal.
We could try and automatically determine inside `or` when regexp-opt can
be used. That doesn't sound like much fun, tho.
Stefan
- Re: master ea93326: Add `union' and `intersection' to rx (bug#37849), Stefan Monnier, 2019/12/10
- Re: master ea93326: Add `union' and `intersection' to rx (bug#37849), Mattias Engdegård, 2019/12/11
- Re: master ea93326: Add `union' and `intersection' to rx (bug#37849), Stefan Monnier, 2019/12/11
- Re: master ea93326: Add `union' and `intersection' to rx (bug#37849), Mattias Engdegård, 2019/12/12
- Re: master ea93326: Add `union' and `intersection' to rx (bug#37849), Stefan Monnier, 2019/12/13
- Re: master ea93326: Add `union' and `intersection' to rx (bug#37849), Mattias Engdegård, 2019/12/13
- Re: master ea93326: Add `union' and `intersection' to rx (bug#37849),
Stefan Monnier <=
- Re: master ea93326: Add `union' and `intersection' to rx (bug#37849), Mattias Engdegård, 2019/12/13
- Re: master ea93326: Add `union' and `intersection' to rx (bug#37849), Stefan Monnier, 2019/12/13
- Re: master ea93326: Add `union' and `intersection' to rx (bug#37849), Mattias Engdegård, 2019/12/15
- Re: master ea93326: Add `union' and `intersection' to rx (bug#37849), Stefan Monnier, 2019/12/15
- Re: master ea93326: Add `union' and `intersection' to rx (bug#37849), Mattias Engdegård, 2019/12/15
- Re: master ea93326: Add `union' and `intersection' to rx (bug#37849), Stefan Monnier, 2019/12/15
- Re: master ea93326: Add `union' and `intersection' to rx (bug#37849), Stefan Monnier, 2019/12/15