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Welcome to the main channel on the development of MoarVM, a virtual machine for NQP and Rakudo (moarvm.org). This channel is being logged for historical purposes. Set by lizmat on 24 May 2021. |
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| lizmat | and yet another Rakudo Weekly News hits the Net: rakudoweekly.blog/2025/03/03/2025-...ting-down/ | 12:57 | |
| timo | once again i am confused by the internal structure of NFAs | 17:18 | |
| lizmat | do we have docs on that ? | 17:21 | |
| timo | never mind, I was just Doing Pointers Wrong | ||
| lizmat | heh... there was a time when that acronym was used a lot | 17:22 | |
| timo | i once had a commit that turned "charlist" edges with just a single character into a "codepoint" edge, that would also come in handy for what i'm currently looking at | 17:28 | |
| right now i'm seeing if i can make a fast path for when the NFA would immediately return "no match" and compile that into the code | 17:29 | ||
| unclear if that's a win or not | 17:31 | ||
| "nfa engine startup" is not really an expensive "operation", and the fast check would always have to happen and can't really take work away from the real engine | |||
| the fast check can actually be a bunch simpler than a full nfa run, as it doesn't have to care about fates at all, and therefore the acceptable characters from all targets can be collapsed into a short list of deduplicated characters | 17:42 | ||
| for example, the NFA for "proto token term" gives me 259 lines of output for "interesting edges" for the first character; subtract 43 from that for synthetic edges and epsilons, then when i deduplicate all codepoint and codepoint longlit together i'm down to 66 unique codepoints, two character classes, and four charlists that i haven't looked at yet | 17:51 | ||
| the charlists expand to 9 characters | 17:52 | ||
| and they are all already there as codepoint edges, too | 17:54 | ||
| ok, this particular example has char classes 4 and 8 which are "alphabetic" and "numeric" respectively, which covers a quite wide variety of stuff | 17:57 | ||
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