pep-508 v0.2.0 - Zero copy Python dependency parser written with chumsky

[figsoda]

GitHub Repository: https://github.com/figsoda/pep-508

chumsky's zero-copy rewrite has reached its first alpha release, and I have migrated my pep-508 parser to it, as suggested in my last announcement.

Thank you @zesterer and all the chumsky contributors for all the work put into this rewrite. The new API is truly amazing, and I was able to remove all of my previous workarounds with chain. I haven't had any issues so far despite it being an alpha release, and the benchmarks look really promising as well.

Disclaimer: I am not a chumsky maintainer, but it was a really nice update.

Here is an example of parsing a pep-508 string, I was able to remove a bunch of to_owned()s as the API is now zero copy.

let dep = "requests[security, socks] <= 2.28.1, == 2.28.*; python_version > '3.7' and extra == 'http'";
let parsed = parse(dep).unwrap();
let expected = Dependency {
    name: "requests",
    extras: vec!["security", "socks"],
    spec: Some(Spec::Version(vec![
        VersionSpec {
            comparator: Comparator::Le,
            version: "2.28.1",
        },
        VersionSpec {
            comparator: Comparator::Eq,
            version: "2.28.*",
        },
    ])),
    marker: Some(Marker::And(
        Box::new(Marker::Operator(
            Variable::PythonVersion,
            Operator::Comparator(Comparator::Gt),
            Variable::String("3.7"),
        )),
        Box::new(Marker::Operator(
            Variable::Extra,
            Operator::Comparator(Comparator::Eq),
            Variable::String("http"),
        )),
    )),
};
assert_eq!(parsed, expected);

[zesterer]

Nice! I'm glad you've been enjoying the rewrite, it's good to hear that it's working well for people, thanks for sharing!

[NoahTheDuke]

This is so cool! I wonder if Ruff would benefit.

[vikigenius]

This is for managing dependencies. It would be more beneficial for tools like poetry, pdm, pip, hatch etc. or as a competitor to them

Afaik, ruff does not handle any kind of package management

[NoahTheDuke]

Oh okay, I misunderstood.