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version.go
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version.go
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// SPDX-FileCopyrightText: 2023-2024 Steffen Vogel <post@steffenvogel.de>
// SPDX-License-Identifier: Apache-2.0
package iso7816
import (
"errors"
"fmt"
"strconv"
"strings"
)
var ErrInvalidVersion = errors.New("invalid version")
// Version encodes a major, minor, and patch version.
type Version struct {
Major int
Minor int
Patch int
}
func ParseVersion(s string) (v Version, err error) {
var ps []string
if s != "" {
ps = strings.Split(s, ".")
}
l := len(ps)
if l > 3 {
return v, fmt.Errorf("%w: too many dots (%d)", ErrInvalidVersion, l)
}
vs := []*int{&v.Major, &v.Minor, &v.Patch}
for i, q := range vs {
if i >= l {
*q = -1
} else if *q, err = strconv.Atoi(ps[i]); err != nil {
return v, err
} else if *q < 0 {
return v, fmt.Errorf("%w: must be positive", ErrInvalidVersion)
}
}
return v, nil
}
func (v Version) String() string {
return fmt.Sprintf("%d.%d.%d", v.Major, v.Minor, v.Patch)
}
func (v Version) Less(w Version) bool {
if v.Major != w.Major {
return v.Major > w.Major
}
if v.Minor != w.Minor {
return v.Minor > w.Minor
}
return v.Patch > w.Patch
}