/
semver.go
55 lines (45 loc) · 1.14 KB
/
semver.go
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package model
import (
"fmt"
"regexp"
"strconv"
)
var versionRX = regexp.MustCompile(`\Av(\d+)\.(\d+)\.(\d+)\z`)
// SemVer represents a semantic version.
type SemVer struct {
Major, Minor, Patch int
}
// NewSemVer returns a new semantic version.
func NewSemVer(version string) *SemVer {
var v SemVer
v.Major, v.Minor, v.Patch = v.parse(NormalizeVersion(version))
return &v
}
// String returns version as a string.
func (v *SemVer) String() string {
return fmt.Sprintf("v%d.%d.%d", v.Major, v.Minor, v.Patch)
}
func (*SemVer) parse(version string) (major, minor, patch int) {
mm := versionRX.FindStringSubmatch(version)
if len(mm) < 4 {
return
}
major, _ = strconv.Atoi(mm[1])
minor, _ = strconv.Atoi(mm[2])
patch, _ = strconv.Atoi(mm[3])
return
}
// NormalizeVersion ensures the version starts with a v.
func NormalizeVersion(version string) string {
if version == "" {
return version
}
if version[0] == 'v' {
return version
}
return "v" + version
}
// IsCurrent asserts if at latest release.
func (v *SemVer) IsCurrent(latest *SemVer) bool {
return v.Major >= latest.Major && v.Minor >= latest.Minor && v.Patch >= latest.Patch
}