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version.go
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version.go
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package fmm
import (
"encoding/json"
"errors"
"fmt"
"strconv"
"strings"
)
type Version [4]uint16
type VersionCmpRes uint8
const (
VersionAny VersionCmpRes = iota
VersionEq
VersionGt
VersionGtEq
VersionLt
VersionLtEq
)
var versionCmpResString = map[VersionCmpRes]string{
VersionEq: "=",
VersionGt: ">",
VersionGtEq: ">=",
VersionLt: "<",
VersionLtEq: "<=",
}
func NewVersion(input string) (*Version, error) {
parts := strings.Split(strings.TrimSpace(input), ".")
if len(parts) < 2 || len(parts) > 4 {
return nil, errors.New("version string must have between 2 and 4 parts")
}
var ver Version
for i, part := range parts {
part, err := strconv.ParseUint(part, 10, 0)
if err != nil {
return nil, err
}
ver[i] = uint16(part)
}
return &ver, nil
}
func (v *Version) Cmp(other *Version) VersionCmpRes {
if other == nil {
return VersionEq
}
for i := range v {
if v[i] > other[i] {
return VersionGt
} else if v[i] < other[i] {
return VersionLt
}
}
return VersionEq
}
func (v *Version) ToString(includeBuild bool) string {
if includeBuild {
return fmt.Sprintf("%d.%d.%d.%d", v[0], v[1], v[2], v[3])
} else {
return fmt.Sprintf("%d.%d.%d", v[0], v[1], v[2])
}
}
func (v *Version) MarshalJSON() ([]byte, error) {
return []byte("\"" + v.ToString(false) + "\""), nil
}
func (v *Version) UnmarshalJSON(data []byte) error {
var s string
if err := json.Unmarshal(data, &s); err != nil {
return err
}
ver, err := NewVersion(s)
if err != nil {
return err
}
v[0] = ver[0]
v[1] = ver[1]
v[2] = ver[2]
v[3] = ver[3]
return nil
}