19 releases (7 breaking)
0.9.1 | Oct 30, 2024 |
---|---|
0.8.1 | Oct 29, 2024 |
0.6.1 | Jul 30, 2024 |
0.4.2 | Feb 18, 2024 |
0.1.1 | Mar 29, 2023 |
#355 in Web programming
90,287 downloads per month
Used in 10 crates
(7 directly)
335KB
7K
SLoC
Dependency specifiers (PEP 508) in Rust
A library for python dependency specifiers, better known as PEP 508.
Usage
In Rust
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.
Dependencies
~7–10MB
~166K SLoC