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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package version
import (
"fmt"
"strconv"
"strings"
"github.com/vespa-engine/vespa/client/go/internal/util"
)
// Version represents a semantic version number.
type Version struct {
Major int
Minor int
Patch int
Label string
}
// IsZero returns whether v is the zero version, 0.0.0.
func (v Version) IsZero() bool {
return v.Major == 0 && v.Minor == 0 && v.Patch == 0
}
func (v Version) String() string {
var sb strings.Builder
sb.WriteString(strconv.Itoa(v.Major))
sb.WriteRune('.')
sb.WriteString(strconv.Itoa(v.Minor))
sb.WriteRune('.')
sb.WriteString(strconv.Itoa(v.Patch))
if v.Label != "" {
sb.WriteRune('-')
sb.WriteString(v.Label)
}
return sb.String()
}
// Compare returns a positive integer if v1 is greater than v2, a negative integer if v1 is less than v2 and zero if they
// are equal.
func (v1 Version) Compare(v2 Version) int {
result := v1.Major - v2.Major
if result != 0 {
return result
}
result = v1.Minor - v2.Minor
if result != 0 {
return result
}
result = v1.Patch - v2.Patch
if result != 0 {
return result
}
// Version without label always sorts first
if v1.Label == "" && v2.Label != "" {
return 1
}
if v1.Label != "" && v2.Label == "" {
return -1
}
if v1.Label > v2.Label {
return 1
}
if v1.Label < v2.Label {
return -1
}
return 0
}
// Less returns true if v1 is lower than v2.
func (v1 Version) Less(v2 Version) bool { return v1.Compare(v2) < 0 }
// MustParse is like Parse, but panics if s cannot be parsed.
func MustParse(s string) Version {
v, err := Parse(s)
if err != nil {
util.JustExitWith(err)
}
return v
}
// Parse parses a semantic version number from string s.
func Parse(s string) (Version, error) {
if len(s) > 0 && s[0] == 'v' {
s = s[1:] // Trim v prefix
}
parts := strings.Split(s, ".")
if len(parts) != 3 {
return Version{}, fmt.Errorf("invalid version number: %s", s)
}
major, err := strconv.Atoi(parts[0])
if err != nil {
return Version{}, fmt.Errorf("invalid major version: %s", parts[0])
}
minor, err := strconv.Atoi(parts[1])
if err != nil {
return Version{}, fmt.Errorf("invalid minor version: %s", parts[1])
}
parts2 := strings.SplitN(parts[2], "-", 2)
patch, err := strconv.Atoi(parts2[0])
if err != nil {
return Version{}, fmt.Errorf("invalid patch version: %s", parts[2])
}
v := Version{Major: major, Minor: minor, Patch: patch}
if len(parts2) > 1 {
v.Label = parts2[1]
}
return v, nil
}
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