History

samypr100 57df0146e2 Update Rust toolchain to 1.89 (#15157 ) ## Summary Bumps Rust toolchain to 1.89, but not the MSRV. Lifetime changes is related to a new lint rule explained in https://blog.rust-lang.org/2025/08/07/Rust-1.89.0/#mismatched-lifetime-syntaxes-lint ## Test Plan Existing Tests		2025-08-08 13:01:52 +00:00
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src	Update Rust toolchain to 1.89 (#15157 )	2025-08-08 13:01:52 +00:00
Cargo.toml	Add `extra-build-dependencies` (#14735 )	2025-07-30 09:53:07 -05:00
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	Use consistent commas around i.e. and e.g. (#12157 )	2025-03-13 23:42:10 +00:00

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.