#pypy on 2021-10-22 — irc logs at libera.irclog.whitequark.org

2021-09-24 06:13 cfbolz changed the topic of #pypy to: #pypy PyPy, the flexible snake https://pypy.org | IRC logs: https://quodlibet.duckdns.org/irc/pypy/latest.log.html#irc-end and https://libera.irclog.whitequark.org/pypy | hacking on TLS is fun, way more fun than arguing over petty shit, turns out

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00:35 <Corbin> Trying to write an EBNF parser but having problems with the special IGNORE rule. I have this grammar https://bpa.st/IXKQ but it's not accepting the test inputs "id\n" or "(comp id id)"; I get a LexerError on the whitespace. What am I doing wrong?

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04:35 <cfbolz> mattip: I don't think so

04:36 <cfbolz> Corbin: gah, not sure it can be recommended

04:36 <cfbolz> Corbin: it's really rickety old code

04:37 <cfbolz> Corbin: anyway, isn't IGNORE wrong as a regular expression? It matches everything *but* whitespace, due to the ^

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05:38 <Corbin> cfbolz: Oh! Okay, I misunderstood. That does get me a little further, thanks.

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14:45 <cfbolz> mattip: I suspect you're already offline, will try to see whether I'll manage to import the 3.9 stlib

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14:51 <Corbin> cfbolz: Thanks for the heads-up on the general state of this parser code. Since I'm just parsing S-expressions, I think I'm going to hand-write a basic stack-driven parser and compose it with a table of constructors and arities. It might be messier, but it will be easier to debug.

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15:37 <Corbin> Well, I guess that I speedran that; I have a hand-rolled S-expression parser now. The code to look up each S-expression constructor is a big if-else table, but otherwise it's good enough.

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20:30 <cfbolz> yayayay, ridiculous nonsense

20:31 <cfbolz> https://www.irccloud.com/pastebin/KUwZBqRM/

20:31 <cfbolz> and as usual the answer to "who wrote this nonsense" is me

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