semver for golang

semver is a Semantic Versioning library written in golang. It fully covers spec version 2.0.0.

Versioning

Old v1-v3 versions exist in the root of the repository for compatiblity reasons and will only receive bug fixes.

The current stable version is v4 and is fully go-mod compatible.

Usage

$ go get github.com/blang/semver/v4
# Or use fixed versions
$ go get github.com/blang/semver/v4@v4.0.0

Note: Always vendor your dependencies or fix on a specific version tag.

importgithub.com/blang/semver/v4v1, err :=semver.Make("1.0.0-beta")
v2, err:=semver.Make("2.0.0-beta")
v1.Compare(v2)

Also check the GoDocs.

Why should I use this lib?

• Fully spec compatible
• No reflection
• No regex
• Fully tested (Coverage >99%)
• Readable parsing/validation errors
• Fast (See Benchmarks)
• Only Stdlib
• Uses values instead of pointers
• Many features, see below

Features

• Parsing and validation at all levels
• Comparator-like comparisons
• Compare Helper Methods
• InPlace manipulation
• Ranges >=1.0.0 <2.0.0 || >=3.0.0 !3.0.1-beta.1
• Wildcards >=1.x, <=2.5.x
• Sortable (implements sort.Interface)
• database/sql compatible (sql.Scanner/Valuer)
• encoding/json compatible (json.Marshaler/Unmarshaler)

Ranges

A Range is a set of conditions which specify which versions satisfy the range.

A condition is composed of an operator and a version. The supported operators are:

• <1.0.0 Less than 1.0.0
• <=1.0.0 Less than or equal to 1.0.0
• >1.0.0 Greater than 1.0.0
• >=1.0.0 Greater than or equal to 1.0.0
• 1.0.0, =1.0.0, ==1.0.0 Equal to 1.0.0
• !1.0.0, !=1.0.0 Not equal to 1.0.0. Excludes version 1.0.0.

Note that spaces between the operator and the version will be gracefully tolerated.

A Range can link multiple Ranges separated by space:

Ranges can be linked by logical AND:

• >1.0.0 <2.0.0 would match between both ranges, so 1.1.1 and 1.8.7 but not 1.0.0 or 2.0.0
• >1.0.0 <3.0.0 !2.0.3-beta.2 would match every version between 1.0.0 and 3.0.0 except 2.0.3-beta.2

Ranges can also be linked by logical OR:

• <2.0.0 || >=3.0.0 would match 1.x.x and 3.x.x but not 2.x.x

AND has a higher precedence than OR. It's not possible to use brackets.

Ranges can be combined by both AND and OR

• >1.0.0 <2.0.0 || >3.0.0 !4.2.1 would match 1.2.3, 1.9.9, 3.1.1, but not 4.2.1, 2.1.1

Range usage:

v, err := semver.Parse("1.2.3")
expectedRange, err := semver.ParseRange(">1.0.0 <2.0.0 || >=3.0.0")
if expectedRange(v) {
//valid
}

Example

Have a look at full examples in v4/examples/main.go

importgithub.com/blang/semver/v4v, err :=semver.Make("0.0.1-alpha.preview+123.github")
fmt.Printf("Major: %d\n", v.Major)
fmt.Printf("Minor: %d\n", v.Minor)
fmt.Printf("Patch: %d\n", v.Patch)
fmt.Printf("Pre: %s\n", v.Pre)
fmt.Printf("Build: %s\n", v.Build)
// Prerelease versions arrayiflen(v.Pre) >0 {
fmt.Println("Prerelease versions:")
fori, pre:=rangev.Pre {
fmt.Printf("%d: %q\n", i, pre)
}
}
// Build meta data arrayiflen(v.Build) >0 {
fmt.Println("Build meta data:")
fori, build:=rangev.Build {
fmt.Printf("%d: %q\n", i, build)
}
}
v001, err:=semver.Make("0.0.1")
// Compare using helpers: v.GT(v2), v.LT, v.GTE, v.LTEv001.GT(v) ==truev.LT(v001) ==truev.GTE(v) ==truev.LTE(v) ==true// Or use v.Compare(v2) for comparisons (-1, 0, 1):v001.Compare(v) ==1v.Compare(v001) ==-1v.Compare(v) ==0// Manipulate Version in place:v.Pre[0], err=semver.NewPRVersion("beta")
iferr!=nil {
fmt.Printf("Error parsing pre release version: %q", err)
}
fmt.Println("\nValidate versions:")
v.Build[0] ="?"err=v.Validate()
iferr!=nil {
fmt.Printf("Validation failed: %s\n", err)
}

Benchmarks

BenchmarkParseSimple-4 5000000 390 ns/op 48 B/op 1 allocs/op
BenchmarkParseComplex-4 1000000 1813 ns/op 256 B/op 7 allocs/op
BenchmarkParseAverage-4 1000000 1171 ns/op 163 B/op 4 allocs/op
BenchmarkStringSimple-4 20000000 119 ns/op 16 B/op 1 allocs/op
BenchmarkStringLarger-4 10000000 206 ns/op 32 B/op 2 allocs/op
BenchmarkStringComplex-4 5000000 324 ns/op 80 B/op 3 allocs/op
BenchmarkStringAverage-4 5000000 273 ns/op 53 B/op 2 allocs/op
BenchmarkValidateSimple-4 200000000 9.33 ns/op 0 B/op 0 allocs/op
BenchmarkValidateComplex-4 3000000 469 ns/op 0 B/op 0 allocs/op
BenchmarkValidateAverage-4 5000000 256 ns/op 0 B/op 0 allocs/op
BenchmarkCompareSimple-4 100000000 11.8 ns/op 0 B/op 0 allocs/op
BenchmarkCompareComplex-4 50000000 30.8 ns/op 0 B/op 0 allocs/op
BenchmarkCompareAverage-4 30000000 41.5 ns/op 0 B/op 0 allocs/op
BenchmarkSort-4 3000000 419 ns/op 256 B/op 2 allocs/op
BenchmarkRangeParseSimple-4 2000000 850 ns/op 192 B/op 5 allocs/op
BenchmarkRangeParseAverage-4 1000000 1677 ns/op 400 B/op 10 allocs/op
BenchmarkRangeParseComplex-4 300000 5214 ns/op 1440 B/op 30 allocs/op
BenchmarkRangeMatchSimple-4 50000000 25.6 ns/op 0 B/op 0 allocs/op
BenchmarkRangeMatchAverage-4 30000000 56.4 ns/op 0 B/op 0 allocs/op
BenchmarkRangeMatchComplex-4 10000000 153 ns/op 0 B/op 0 allocs/op

See benchmark cases at semver_test.go

Motivation

I simply couldn't find any lib supporting the full spec. Others were just wrong or used reflection and regex which i don't like.

Contribution

Feel free to make a pull request. For bigger changes create a issue first to discuss about it.

License

See LICENSE file.