Parser and evaluator for Cargo-style Semantic Versioning; parse/compare versions and requirements, including prerelease/build metadata. Faithful line-by-line transliteration with provenance headers.
This is a Kotlin Multiplatform line-by-line transliteration port of dtolnay/semver.
Original Project: This port is based on dtolnay/semver. All design credit and project intent belong to the upstream authors; this repository is a faithful port to Kotlin Multiplatform with no behavioural changes intended.
This is an in-progress port. The goal is feature parity with the upstream Rust crate while providing a native Kotlin Multiplatform API. Every Kotlin file carries a // port-lint: source <path> header naming its upstream Rust counterpart so the AST-distance tool can track provenance.
The text below is reproduced and lightly edited from
https://github.com/dtolnay/semver. It is the upstream project's own description and remains under the upstream authors' authorship; links have been rewritten to absolute upstream URLs so they continue to resolve from this repository.
A parser and evaluator for Cargo's flavor of Semantic Versioning.
Semantic Versioning (see https://semver.org) is a guideline for how version numbers are assigned and incremented. It is widely followed within the Cargo/crates.io ecosystem for Rust.
[dependencies]
semver = "1.0"use semver::{BuildMetadata, Prerelease, Version, VersionReq};
fn main() {
let req = VersionReq::parse(">=1.2.3, <1.8.0").unwrap();
// Check whether this requirement matches version 1.2.3-alpha.1 (no)
let version = Version {
major: 1,
minor: 2,
patch: 3,
pre: Prerelease::new("alpha.1").unwrap(),
build: BuildMetadata::EMPTY,
};
assert!(!req.matches(&version));
// Check whether it matches 1.3.0 (yes it does)
let version = Version::parse("1.3.0").unwrap();
assert!(req.matches(&version));
}Besides Cargo, several other package ecosystems and package managers for other languages also use SemVer: RubyGems/Bundler for Ruby, npm for JavaScript, Composer for PHP, CocoaPods for Objective-C...
The semver crate is specifically intended to implement Cargo's interpretation
of Semantic Versioning.
Where the various tools differ in their interpretation or implementation of the spec, this crate follows the implementation choices made by Cargo. If you are operating on version numbers from some other package ecosystem, you will want to use a different semver library which is appropriate to that ecosystem.
The extent of Cargo's SemVer support is documented in the Specifying Dependencies chapter of the Cargo reference.
dependencies {
implementation("io.github.kotlinmania:semver-kotlin:0.3.0")
}./gradlew build
./gradlew testSee AGENTS.md and CLAUDE.md for translator discipline, port-lint header convention, and Rust → Kotlin idiom mapping.
This Kotlin port is distributed under the same MIT license as the upstream dtolnay/semver. See LICENSE (and any sibling LICENSE-* / NOTICE files mirrored from upstream) for the full text.
Original work copyrighted by the semver authors.
Kotlin port: Copyright (c) 2026 Sydney Renee and The Solace Project.
Thanks to the dtolnay/semver maintainers and contributors for the original Rust implementation. This port reproduces their work in Kotlin Multiplatform; bug reports about upstream design or behavior should go to the upstream repository.
This is a Kotlin Multiplatform line-by-line transliteration port of dtolnay/semver.
Original Project: This port is based on dtolnay/semver. All design credit and project intent belong to the upstream authors; this repository is a faithful port to Kotlin Multiplatform with no behavioural changes intended.
This is an in-progress port. The goal is feature parity with the upstream Rust crate while providing a native Kotlin Multiplatform API. Every Kotlin file carries a // port-lint: source <path> header naming its upstream Rust counterpart so the AST-distance tool can track provenance.
The text below is reproduced and lightly edited from
https://github.com/dtolnay/semver. It is the upstream project's own description and remains under the upstream authors' authorship; links have been rewritten to absolute upstream URLs so they continue to resolve from this repository.
A parser and evaluator for Cargo's flavor of Semantic Versioning.
Semantic Versioning (see https://semver.org) is a guideline for how version numbers are assigned and incremented. It is widely followed within the Cargo/crates.io ecosystem for Rust.
[dependencies]
semver = "1.0"use semver::{BuildMetadata, Prerelease, Version, VersionReq};
fn main() {
let req = VersionReq::parse(">=1.2.3, <1.8.0").unwrap();
// Check whether this requirement matches version 1.2.3-alpha.1 (no)
let version = Version {
major: 1,
minor: 2,
patch: 3,
pre: Prerelease::new("alpha.1").unwrap(),
build: BuildMetadata::EMPTY,
};
assert!(!req.matches(&version));
// Check whether it matches 1.3.0 (yes it does)
let version = Version::parse("1.3.0").unwrap();
assert!(req.matches(&version));
}Besides Cargo, several other package ecosystems and package managers for other languages also use SemVer: RubyGems/Bundler for Ruby, npm for JavaScript, Composer for PHP, CocoaPods for Objective-C...
The semver crate is specifically intended to implement Cargo's interpretation
of Semantic Versioning.
Where the various tools differ in their interpretation or implementation of the spec, this crate follows the implementation choices made by Cargo. If you are operating on version numbers from some other package ecosystem, you will want to use a different semver library which is appropriate to that ecosystem.
The extent of Cargo's SemVer support is documented in the Specifying Dependencies chapter of the Cargo reference.
dependencies {
implementation("io.github.kotlinmania:semver-kotlin:0.3.0")
}./gradlew build
./gradlew testSee AGENTS.md and CLAUDE.md for translator discipline, port-lint header convention, and Rust → Kotlin idiom mapping.
This Kotlin port is distributed under the same MIT license as the upstream dtolnay/semver. See LICENSE (and any sibling LICENSE-* / NOTICE files mirrored from upstream) for the full text.
Original work copyrighted by the semver authors.
Kotlin port: Copyright (c) 2026 Sydney Renee and The Solace Project.
Thanks to the dtolnay/semver maintainers and contributors for the original Rust implementation. This port reproduces their work in Kotlin Multiplatform; bug reports about upstream design or behavior should go to the upstream repository.