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uv/crates/uv-pep508
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Charlie Marsh dd760ee507
Normalize platform_system to sys_platform (#9949) 
## Summary

A revival of an old idea (#9344) that I have slightly more confidence in
now. I abandoned this idea because (1) it couldn't capture that, e.g.,
`platform_system == 'Windows' and sys_platform == 'foo'` (or some other
unknown value) are disjoint, and (2) I thought that Android returned
`"android"` for one of `sys_platform` or `platform_system`, which
would've made this logic incorrect.

However, it looks like Android... doesn't do that? And the values here
are almost always in a small, known set. So in the end, the tradeoffs
here actually seem pretty good.

Vis-a-vis our current solution, this can (e.g.) _simplify out_
expressions like `sys_platform == 'win32' or platform_system ==
'Windows'`.
2024-12-18 10:29:34 -05:00
..
src Normalize platform_system to sys_platform (#9949) 2024-12-18 10:29:34 -05:00
Cargo.toml Fix feature scoping for pep508 wasm32 support for ruff (#8694) 2024-10-30 12:21:23 +00:00
Changelog.md Add uv- prefix to all internal crates (#7853) 2024-10-01 20:15:32 -04:00
License-Apache Add uv- prefix to all internal crates (#7853) 2024-10-01 20:15:32 -04:00
License-BSD Add uv- prefix to all internal crates (#7853) 2024-10-01 20:15:32 -04:00
Readme.md Link to Dependency specifiers instead of PEP 508 (#8411) 2024-10-21 14:43:38 -04:00

Readme.md

Dependency specifiers (PEP 508) in Rust

Crates.io PyPI

A library for dependency specifiers, previously known as PEP 508.

Usage

use std::str::FromStr;
use pep508_rs::Requirement;

let marker = r#"requests [security,tests] >= 2.8.1, == 2.8.* ; python_version > "3.8""#;
let dependency_specification = Requirement::from_str(marker).unwrap();
assert_eq!(dependency_specification.name, "requests");
assert_eq!(dependency_specification.extras, Some(vec!["security".to_string(), "tests".to_string()]));

Markers

Markers allow you to install dependencies only in specific environments (python version, operating system, architecture, etc.) or when a specific feature is activated. E.g. you can say importlib-metadata ; python_version < "3.8" or itsdangerous (>=1.1.0) ; extra == 'security'. Unfortunately, the marker grammar has some oversights (e.g. https://github.com/pypa/packaging.python.org/pull/1181) and the design of comparisons (PEP 440 comparisons with lexicographic fallback) leads to confusing outcomes. This implementation tries to carefully validate everything and emit warnings whenever bogus comparisons with unintended semantics are made.