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yoshuawuyts's profile
yosh
yosh
yosh
@yoshuawuyts

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yosh

@yoshuawuyts

Software researcher. he/they

Berlin, UTC+2
blog.yoshuawuyts.com
Joined May 2009

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    yosh‏ @yoshuawuyts 9 Dec 2019
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    How do folks feel about "parser generators", "parser combinators", and how they compare? I guess I've only ever written / used "parser combinators" before; though wasn't quite aware that's what I was using. I have no real intuition about "parser generators", so curious to hear!

    7:28 AM - 9 Dec 2019
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    • Kristleifur Daðason Esteban K – 🦀⚙️@home Kat Marchán 🍑🍑🍑 Ari! Sid
    4 replies 0 retweets 5 likes
      1. yosh‏ @yoshuawuyts 9 Dec 2019
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        Prompted because I was looking at the tokenization code of the toml crate, and I'm having a big feel of: "this sure would be nice to abstract". -- But the question is *how*.https://github.com/alexcrichton/toml-rs/blob/master/src/tokens.rs#L97-L130 …

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      2. elsie d. soundsystem‏ @mountain_ghosts 9 Dec 2019
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        Replying to @yoshuawuyts

        disclaimer: author of a parser generator library here I like combinators a lot, especially as an introduction to parsing as they're relatively little work to implement and explain, and to test

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      3. elsie d. soundsystem‏ @mountain_ghosts 9 Dec 2019
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        Replying to @mountain_ghosts @yoshuawuyts

        personally, I've got much better performance out of generated code in high-level dynamic langs like ruby and JS; it's hard to make a lot of function calls perform compared to generated code plus I like defining a grammar once and generating multiple languages from it

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      1. Omer Ben-Amram‏ @OBenamram 9 Dec 2019
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        Replying to @yoshuawuyts

        + I love what you're doing with extensions to cursors. This is basically what I've used in my parser! + very crude hexdump view on errors. https://github.com/omerbenamram/evtx/blob/master/src/macros.rs … for what I use to read bytes + capture context for error reporting.

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      1. Omer Ben-Amram‏ @OBenamram 9 Dec 2019
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        Replying to @yoshuawuyts

        I've written a bunch of text and binary parsers in rust - I feel like combinator abstractions are only helpful when the input doesn't do any lookbehind/context sensetive stuff. With text parsing there is usually less lookbehind.

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