History

Zanie Blue ae25c2f4db Upgrade minimum Rust version to 1.83 (#9815 ) This reverts commit `6cc7a560f7` to reapply #9511 since we've disabled ppc64le-musl per #9793		2024-12-11 10:06:19 -06:00
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src	Upgrade minimum Rust version to 1.83 (#9815 )	2024-12-11 10:06:19 -06:00
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

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.