Experimental bitfield feature

[yaxu]

Implements bitfields:
https://forum.algorithmicpattern.org/t/bytebeat-tixyland-and-other-functions-of-time/396

Inspired by their visual similarity to some weaving patterns:
https://forum.algorithmicpattern.org/t/weaving/359/2?u=yaxu

Warning, this uses eval(), so shouldn't be merged until the input validation is verified as safe. Otherwise folks might run untrusted javascript in their browser by loading a pattern shared by an evil weaver, who then might sabotage their saved drafts!

[yaxu]

The regex might be enough to make this secure now.. Could be better though, e.g. with useful parse errors.

[yaxu]

Now redone with mathjs expressions https://mathjs.org/docs/expressions/parsing.html

I just had to hack ^ to be parsed as ^|, as mathjs uses that for the bitwise 'not' used a lot in bitfields.

(With thanks to zspotter@mastodon.social )

[Devendork]

Hey @yaxu
I'm in the process of integrating pull requests (late - sorry!) and would love to include this! If I'm understanding the thread correctly does the current implementation use the parsing regex for safety already or is that something I should look into more deeply when I merge it?