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steveklabnik
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Semantic version parsing and comparison.

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semver

Semantic version parsing and comparison.

Build Status

Documentation

Semantic versioning (see https://semver.org/) is a set of rules for assigning version numbers.

SemVer and the Rust ecosystem

Rust itself follows the SemVer specification, as does its standard libraries. The two are not tied together.

Cargo, Rust's package manager, uses SemVer to determine which versions of packages you need installed.

Installation

To use

semver
, add this to your
[dependencies]
section:
semver = "0.11.0"

And this to your crate root:

extern crate semver;

Versions

At its simplest, the

semver
crate allows you to construct
Version
objects using the
parse
method:
use semver::Version;

assert!(Version::parse("1.2.3") == Ok(Version { major: 1, minor: 2, patch: 3, pre: vec!(), build: vec!(), }));

If you have multiple

Version
s, you can use the usual comparison operators to compare them:
use semver::Version;

assert!(Version::parse("1.2.3-alpha") != Version::parse("1.2.3-beta")); assert!(Version::parse("1.2.3-alpha2") > Version::parse("1.2.0"));

Requirements

The

semver
crate also provides the ability to compare requirements, which are more complex comparisons.

For example, creating a requirement that only matches versions greater than or equal to 1.0.0:

use semver::Version;
use semver::VersionReq;

let r = VersionReq::parse(">= 1.0.0").unwrap(); let v = Version::parse("1.0.0").unwrap();

assert!(r.to_string() == ">= 1.0.0".to_string()); assert!(r.matches(&v))

It also allows parsing of

~x.y.z
and
^x.y.z
requirements as defined at https://www.npmjs.com/package/semver

Tilde requirements specify a minimal version with some updates:

~1.2.3 := >=1.2.3 <1.3.0
~1.2   := >=1.2.0 <1.3.0
~1     := >=1.0.0 <2.0.0

Caret requirements allow SemVer compatible updates to a specified version,

0.x
and
0.x+1
are not considered compatible, but
1.x
and
1.x+1
are.

0.0.x
is not considered compatible with any other version. Missing minor and patch versions are desugared to
0
but allow flexibility for that value.
^1.2.3 := >=1.2.3 <2.0.0
^0.2.3 := >=0.2.3 <0.3.0
^0.0.3 := >=0.0.3 <0.0.4
^0.0   := >=0.0.0 <0.1.0
^0     := >=0.0.0 <1.0.0

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