Struct Version

source

pub struct Version {
    pub major: u64,
    pub minor: u64,
    pub patch: u64,
    pub pre: Prerelease,
    pub build: BuildMetadata,
}

Expand description

SemVer version as defined by https://semver.org.

§Syntax

The major, minor, and patch numbers may be any integer 0 through u64::MAX. When representing a SemVer version as a string, each number is written as a base 10 integer. For example, 1.0.119.
Leading zeros are forbidden in those positions. For example 1.01.00 is invalid as a SemVer version.
The pre-release identifier, if present, must conform to the syntax documented for Prerelease.
The build metadata, if present, must conform to the syntax documented for BuildMetadata.
Whitespace is not allowed anywhere in the version.

§Total ordering

Given any two SemVer versions, one is less than, greater than, or equal to the other. Versions may be compared against one another using Rust’s usual comparison operators.

The major, minor, and patch number are compared numerically from left to right, lexicographically ordered as a 3-tuple of integers. So for example version 1.5.0 is less than version 1.19.0, despite the fact that “1.19.0” < “1.5.0” as ASCIIbetically compared strings and 1.19 < 1.5 as real numbers.
When major, minor, and patch are equal, a pre-release version is considered less than the ordinary release: version 1.0.0-alpha.1 is less than version 1.0.0.
Two pre-releases of the same major, minor, patch are compared by lexicographic ordering of dot-separated components of the pre-release string.
- Identifiers consisting of only digits are compared numerically: 1.0.0-pre.8 is less than 1.0.0-pre.12.
- Identifiers that contain a letter or hyphen are compared in ASCII sort order: 1.0.0-pre12 is less than 1.0.0-pre8.
- Any numeric identifier is always less than any non-numeric identifier: 1.0.0-pre.1 is less than 1.0.0-pre.x.

Example: 1.0.0-alpha < 1.0.0-alpha.1 < 1.0.0-alpha.beta < 1.0.0-beta < 1.0.0-beta.2 < 1.0.0-beta.11 < 1.0.0-rc.1 < 1.0.0

Fields§

§major: u64§minor: u64§patch: u64§pre: Prerelease§build: BuildMetadata

Implementations§

source §

impl Version

source

pub const fn new(major: u64, minor: u64, patch: u64) -> Self

Create Version with an empty pre-release and build metadata.

Equivalent to:

Version {
    major,
    minor,
    patch,
    pre: Prerelease::EMPTY,
    build: BuildMetadata::EMPTY,
}

source

pub fn parse(text: &str) -> Result<Self, Error>

Create Version by parsing from string representation.

§Errors

Possible reasons for the parse to fail include:

1.0 — too few numeric components. A SemVer version must have exactly three. If you are looking at something that has fewer than three numbers in it, it’s possible it is a VersionReq instead (with an implicit default ^ comparison operator).
1.0.01 — a numeric component has a leading zero.
1.0.unknown — unexpected character in one of the components.
1.0.0- or 1.0.0+ — the pre-release or build metadata are indicated present but empty.
1.0.0-alpha_123 — pre-release or build metadata have something outside the allowed characters, which are 0-9, A-Z, a-z, -, and . (dot).
23456789999999999999.0.0 — overflow of a u64.

source

pub fn cmp_precedence(&self, other: &Self) -> Ordering

Compare the major, minor, patch, and pre-release value of two versions, disregarding build metadata. Versions that differ only in build metadata are considered equal. This comparison is what the SemVer spec refers to as “precedence”.

§Example

use semver::Version;

let mut versions = [
    "1.20.0+c144a98".parse::<Version>().unwrap(),
    "1.20.0".parse().unwrap(),
    "1.0.0".parse().unwrap(),
    "1.0.0-alpha".parse().unwrap(),
    "1.20.0+bc17664".parse().unwrap(),
];

// This is a stable sort, so it preserves the relative order of equal
// elements. The three 1.20.0 versions differ only in build metadata so
// they are not reordered relative to one another.
versions.sort_by(Version::cmp_precedence);
assert_eq!(versions, [
    "1.0.0-alpha".parse().unwrap(),
    "1.0.0".parse().unwrap(),
    "1.20.0+c144a98".parse().unwrap(),
    "1.20.0".parse().unwrap(),
    "1.20.0+bc17664".parse().unwrap(),
]);

// Totally order the versions, including comparing the build metadata.
versions.sort();
assert_eq!(versions, [
    "1.0.0-alpha".parse().unwrap(),
    "1.0.0".parse().unwrap(),
    "1.20.0".parse().unwrap(),
    "1.20.0+bc17664".parse().unwrap(),
    "1.20.0+c144a98".parse().unwrap(),
]);