semver-php

Rust implementation of Composer's semver library for parsing and matching version constraints.

This library implements Composer's versioning specification, which differs from standard semver in several important ways. You likely want to use the semver crate instead.

Differences from Standard Semver

Composer's semver differs from standard semver in several ways:

Four components: Versions are normalized to MAJOR.MINOR.PATCH.EXTRA (e.g., 1.2.3.0)
Branch handling: Dev branches like dev-master and 1.x-dev are first-class citizens
Stability modifiers: Versions can have stability suffixes (-dev, -alpha, -beta, -RC)
Short forms: Stability can use short forms (-a for alpha, -b for beta, etc.)
Tilde behavior: ~1.2 means >=1.2 <2.0 (not >=1.2.0 <1.3.0 as in npm)

Usage

use semver_php::Semver;

// Check if a version satisfies a constraint
assert!(Semver::satisfies("1.2.3", "^1.0").unwrap());
assert!(!Semver::satisfies("2.0.0", "^1.0").unwrap());
assert!(Semver::satisfies("2.0.0", ">=1.0 <3.0").unwrap());

// Filter versions by constraint
let matching = Semver::satisfied_by(&["1.0", "1.5", "2.0", "3.0"], "^1.0").unwrap();
assert_eq!(matching, vec!["1.0", "1.5"]);

// Sort versions
let sorted = Semver::sort(&["2.0", "1.0", "1.5", "3.0"]).unwrap();
assert_eq!(sorted, vec!["1.0", "1.5", "2.0", "3.0"]);

Constraint Syntax

The library supports all Composer constraint formats:

Exact Version

use semver_php::Semver;

assert!(Semver::satisfies("1.2.3", "1.2.3").unwrap());

Comparison Operators

use semver_php::Semver;
assert!(Semver::satisfies("2.0.0", ">1.0").unwrap());
assert!(Semver::satisfies("0.9.0", "<1.0").unwrap());
assert!(Semver::satisfies("1.0.0", ">=1.0").unwrap());
assert!(Semver::satisfies("1.0.0", "<=1.0").unwrap());
assert!(Semver::satisfies("2.0.0", "!=1.0").unwrap());

Tilde Ranges (~)

The tilde operator allows patch-level changes:

use semver_php::Semver;

assert!(Semver::satisfies("1.5.0", "~1.2").unwrap());
assert!(Semver::satisfies("1.2.5", "~1.2.3").unwrap());
assert!(!Semver::satisfies("1.3.0", "~1.2.3").unwrap());

Caret Ranges (^)

The caret operator allows changes that don't modify the left-most non-zero digit:

use semver_php::Semver;

assert!(Semver::satisfies("1.9.9", "^1.2.3").unwrap());
assert!(Semver::satisfies("0.2.9", "^0.2.3").unwrap());
assert!(!Semver::satisfies("2.0.0", "^1.2.3").unwrap());
assert!(!Semver::satisfies("0.3.0", "^0.2.3").unwrap());

Wildcard Ranges

use semver_php::Semver;

assert!(Semver::satisfies("2.0.0", "*").unwrap());
assert!(Semver::satisfies("1.5.0", "1.*").unwrap());
assert!(Semver::satisfies("1.2.3", "1.2.*").unwrap());
assert!(!Semver::satisfies("1.3.0", "1.2.*").unwrap());

Hyphen Ranges

use semver_php::Semver;

assert!(Semver::satisfies("1.5.0", "1.0 - 2.0").unwrap());
assert!(Semver::satisfies("2.0.5", "1.0 - 2.0").unwrap());
assert!(Semver::satisfies("2.0.0", "1.0.0 - 2.0.0").unwrap());
assert!(!Semver::satisfies("2.0.1", "1.0.0 - 2.0.0").unwrap());

AND Constraints

Separate constraints with a space or comma:

use semver_php::Semver;

assert!(Semver::satisfies("1.5.0", ">=1.0 <2.0").unwrap());
assert!(Semver::satisfies("1.5.0", ">=1.0, <2.0").unwrap());

OR Constraints

Separate alternatives with ||:

use semver_php::Semver;

assert!(Semver::satisfies("1.5.0", "^1.0 || ^2.0").unwrap());
assert!(Semver::satisfies("2.5.0", "^1.0 || ^2.0").unwrap());
assert!(!Semver::satisfies("3.0.0", "^1.0 || ^2.0").unwrap());

Stability Handling

Composer semver includes stability modifiers:

use semver_php::VersionParser;

assert_eq!(VersionParser::normalize("1.0.0-dev").unwrap(), "1.0.0.0-dev");
assert_eq!(VersionParser::normalize("1.0.0-RC1").unwrap(), "1.0.0.0-RC1");
assert_eq!(VersionParser::normalize("dev-master").unwrap(), "dev-master");
assert_eq!(VersionParser::normalize("1.0.0-beta2").unwrap(), "1.0.0.0-beta2");
assert_eq!(VersionParser::normalize("1.0.0-alpha1").unwrap(), "1.0.0.0-alpha1");
assert_eq!(VersionParser::normalize("1.x-dev").unwrap(), "1.9999999.9999999.9999999-dev");

Version Normalization

Composer normalizes versions to a 4-component format:

use semver_php::VersionParser;

assert_eq!(VersionParser::normalize("1").unwrap(), "1.0.0.0");
assert_eq!(VersionParser::normalize("1.2").unwrap(), "1.2.0.0");
assert_eq!(VersionParser::normalize("1.2.3").unwrap(), "1.2.3.0");
assert_eq!(VersionParser::normalize("v1.2.3").unwrap(), "1.2.3.0");

Comparing Versions

For direct version comparison:

assert!(semver_php::compare("1.0", "<", "2.0").unwrap());
assert!(semver_php::compare("2.0", ">", "1.0").unwrap());
assert!(semver_php::compare("1.0", "==", "1.0.0").unwrap());

assert!(semver_php::less_than("1.0", "2.0").unwrap());
assert!(semver_php::greater_than("2.0", "1.0").unwrap());
assert!(semver_php::equal_to("1.0.0", "1.0.0.0").unwrap());

Working with Constraints Directly

For more control, use the constraint types directly:

use semver_php::{VersionParser, Constraint, SingleConstraint, Operator};

let constraint = VersionParser::parse_constraints("^1.0 || ^2.0").unwrap();

assert!(constraint.matches(&SingleConstraint::new(Operator::Eq, "1.5.0.0")));

Benchmarks

This library is benchmarked against the original PHP composer/semver using Criterion (Rust) and PHPBench (PHP).

Operation	PHP	Rust	Speedup
Normalize (simple)	7.7 µs	3.6 µs	2.1x
Normalize (complex)	13.8 µs	6.1 µs	2.3x
Parse constraints (simple)	19.0 µs	9.2 µs	2.1x
Parse constraints (complex)	53.2 µs	22.4 µs	2.4x
Satisfies check	64.8 µs	38.2 µs	1.7x
Sort (10 versions)	29.3 µs	12.0 µs	2.4x
Sort (100 versions)	392 µs	252 µs	1.6x
Parse stability	6.2 µs	0.9 µs	7.3x

Geometric mean speedup: 2.1x

To run the benchmarks yourself (requires Rust and PHP):

./benches/compare.sh

License

This project is licensed under the MIT License - see the LICENSE file for details

semver-php 0.1.0