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semver.go
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semver.go
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package semver // import "go.nanasi880.dev/semver"
import (
"fmt"
"regexp"
"strconv"
"strings"
)
// Version
type Version struct {
Raw string
Major int
Minor int
Patch int
}
// Less is true return if `v` less `rhs`.
func (v Version) Less(rhs Version) bool {
left := [3]int{
v.Major, v.Minor, v.Patch,
}
right := [3]int{
rhs.Major, rhs.Minor, rhs.Patch,
}
return v.cmp(left, right) < 0
}
// cmp is negative return if `left` less `right`.
// if equal, return 0.
// if greater, return positive.
func (v *Version) cmp(left [3]int, right [3]int) int {
for i := 0; i < 3; i++ {
if left[i] == right[i] {
continue
}
if left[i] < right[i] {
return -1
}
return 1
}
return 0
}
// Versions is slice of Version.
type Versions []Version
// Len implements sort.Interface.
func (s Versions) Len() int {
return len(s)
}
// Less implements sort.Interface.
func (s Versions) Less(i, j int) bool {
return s[i].Less(s[j])
}
// Swap implements sort.Interface.
func (s Versions) Swap(i, j int) {
s[i], s[j] = s[j], s[i]
}
var (
semverPattern = regexp.MustCompile(`^[0-9]+\.?[0-9]*\.?[0-9]*$`)
)
// Parse is parse of semver string with "v" prefix
func Parse(s string) (Version, error) {
return ParseWithPrefix(s, "v")
}
// ParseWithPrefix is parse of semver string with custom prefix
func ParseWithPrefix(s string, prefix string) (Version, error) {
var version Version
version.Raw = s
s = strings.TrimLeft(s, prefix)
if !semverPattern.MatchString(s) {
return Version{}, fmt.Errorf("parse error: invalid pattern")
}
var (
match = strings.Split(s, ".")
values [3]int
)
for i := range match {
v, err := strconv.ParseInt(match[i], 10, 32)
if err != nil {
return Version{}, fmt.Errorf("parse error: parse int failed: %v", err)
}
values[i] = int(v)
}
version.Major = values[0]
version.Minor = values[1]
version.Patch = values[2]
return version, nil
}