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Twts matching #Protocol
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I played around with parsers. This time I experimented with parser combinators for twt message text tokenization. Basically, extract mentions, subjects, URLs, media and regular text. It’s kinda nice, although my solution is not completely elegant, I have to say. Especially my communication protocol between different steps for intermediate results is really ugly. Not sure about performance, I reckon a hand-written state machine parser would be quite a bit faster. I need to write a second parser and then benchmark them.

lexer.go and newparser.go resemble the parser combinators: https://git.isobeef.org/lyse/tt2/-/commit/4d481acad0213771fe5804917576388f51c340c0 It’s far from finished yet.

The first attempt in parser.go doesn’t work as my backtracking is not accounted for, I noticed only later, that I have to do that. With twt message texts there is no real error in parsing. Just regular text as a “fallback”. So it works a bit differently than parsing a real language. No error reporting required, except maybe for debugging. My goal was to port my Python code as closely as possible. But then the runes in the string gave me a bit of a headache, so I thought I just build myself a nice reader abstraction. When I noticed the missing backtracking, I then decided to give parser combinators a try instead of improving on my look ahead reader. It only later occurred to me, that I could have just used a rune slice instead of a string. With that, porting the Python code should have been straightforward.

Yeah, all this doesn’t probably make sense, unless you look at the code. And even then, you have to learn the ropes a bit. Sorry for the noise. :-)

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It feels like every time I come across a Gemini capsule I find interesting, the owner suddenly stops posting and leaves the protocol. Maybe that’s a lesson for me: if I like their content, reach out to them and let them know.

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In-reply-to » @jlj I like your website's look, but i was disappointed to find that 'finger' doesn't seem to actually work. ;-)

You need better pen test scripts. :-) Seriously, the protocol is absurdly simple. Turn it on! Don’t trust any of the implementations? Write your own!

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i want to use something similar to ssb producer tokens as the basis for novo atlantis trade protocols. interfacing with scarcity currencies has been a headache, but i think something like taller that does delegated settlement can link coop credits to another currency for foreign trade could work. devil is in the details.

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In-reply-to » Looking at raw IRC traffic streams to debug a client issue and it's 1997 again.

Indeed! I think the first “network protocol client” I ever wrote was something that just did the PING/PONG part and passed everything else raw.

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In-reply-to » My finger server now includes the last post from tw that doesn't have a subject. 'finger a@9srv.net'

No, totally not useful. 🤣 I mean, the finger protocol is pretty trivial, and it’d be fun to add, but doesn’t replace anything you’re doing.

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