/
version.go
398 lines (357 loc) · 9.34 KB
/
version.go
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// Copyright 2012, 2013 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
// Package version implements version parsing.
package version
import (
"encoding/json"
"errors"
"fmt"
"regexp"
"strconv"
"strings"
"github.com/juju/mgo/v3/bson"
)
// Number represents a version number.
type Number struct {
Major int
Minor int
Tag string
Patch int
Build int
}
// Zero is occasionally convenient and readable.
// Please don't change its value.
var Zero = Number{}
// Binary specifies a binary version of juju.v
type Binary struct {
Number
Release string
Arch string
}
// String returns the string representation of the binary version.
func (b Binary) String() string {
return fmt.Sprintf("%v-%s-%s", b.Number, b.Release, b.Arch)
}
// GetBSON implements bson.Getter.
func (b Binary) GetBSON() (interface{}, error) {
return b.String(), nil
}
// SetBSON implements bson.Setter.
func (b *Binary) SetBSON(raw bson.Raw) error {
var s string
err := raw.Unmarshal(&s)
if err != nil {
return err
}
v, err := ParseBinary(s)
if err != nil {
return err
}
*b = v
return nil
}
// MarshalJSON implements json.Marshaler.
func (b Binary) MarshalJSON() ([]byte, error) {
return json.Marshal(b.String())
}
// UnmarshalJSON implements json.Unmarshaler.
func (b *Binary) UnmarshalJSON(data []byte) error {
var s string
if err := json.Unmarshal(data, &s); err != nil {
return err
}
v, err := ParseBinary(s)
if err != nil {
return err
}
*b = v
return nil
}
// MarshalYAML implements yaml.v2.Marshaller interface.
func (b Binary) MarshalYAML() (interface{}, error) {
return b.String(), nil
}
// UnmarshalYAML implements the yaml.Unmarshaller interface.
func (b *Binary) UnmarshalYAML(unmarshal func(interface{}) error) error {
var vstr string
err := unmarshal(&vstr)
if err != nil {
return err
}
v, err := ParseBinary(vstr)
if err != nil {
return err
}
*b = v
return nil
}
const (
// NumberRegex for matching version strings in the forms:
// - 1.2
// - 1.2.3
// - 1.2.3.4
// - 1.2-alpha3
// - 1.2-alpha3.4
NumberRegex = `(?P<major>\d{1,9})(\.((?P<minor>\d{1,9})((?:(-((?P<tag>[a-z]+)(?P<patchInTag>\d{1,9})?))|(\.(?P<patch>\d{1,9})))?)(\.(?P<build>\d{1,9}))?))?`
// BinaryRegex for matching binary version strings in the form:
// - 1.2-release-arch
// - 1.2.3-release-arch
// - 1.2.3.4-release-arch
// - 1.2-alpha3-release-arch
// - 1.2-alpha3.4-release-arch
BinaryRegex = NumberRegex + `-(?P<release>[^-]+)-(?P<arch>[^-]+)`
)
var (
binaryPat = regexp.MustCompile(`^` + BinaryRegex + `$`)
numberPat = regexp.MustCompile(`^` + NumberRegex + `$`)
errInvalidVersion = errors.New("invalid version")
)
// MustParse parses a version and panics if it does
// not parse correctly.
func MustParse(s string) Number {
v, err := Parse(s)
if err != nil {
panic(err)
}
return v
}
// MustParseBinary parses a binary version and panics if it does
// not parse correctly.
func MustParseBinary(s string) Binary {
b, err := ParseBinary(s)
if err != nil {
panic(err)
}
return b
}
// ParseBinary parses a binary version of the form "1.2.3-series-arch".
func ParseBinary(s string) (Binary, error) {
groups := captureNamedGroups(s, binaryPat)
n := parseVersion(groups, true)
if n == nil {
return Binary{}, fmt.Errorf("invalid binary version %q", s)
}
return Binary{
Number: *n,
Release: groups["release"],
Arch: groups["arch"],
}, nil
}
// Parse a version in strict mode. The following version patterns are accepted:
// 1.2.3 (major, minor, patch)
// 1.2-tag3 (major, minor, patch, tag)
// 1.2.3.4 (major, minor, patch, build)
// 1.2-tag3.4 (major, minor, patch, build)
//
// The ParseNonStrict function can be used instead to parse a wider range of
// version patterns (e.g. major only, major/minor etc.).
func Parse(s string) (Number, error) {
groups := captureNamedGroups(s, numberPat)
if n := parseVersion(groups, true); n != nil {
return *n, nil
}
return Number{}, fmt.Errorf("invalid version %q", s)
}
// ParseNonStrict attempts to parse a version in non-strict mode. It supports
// the same patterns as Parse with the addition of some extra patterns that
// are not considered pure semantic version values.
//
// The following version patterns are accepted:
// 1 (major)
// 1.2 (major, minor)
// 1.2.3 (major, minor, patch)
// 1.2-tag (major, minor, tag)
// 1.2-tag3 (major, minor, patch, tag)
// 1.2.3.4 (major, minor, patch, build)
// 1.2-tag3.4 (major, minor, patch, build)
func ParseNonStrict(s string) (Number, error) {
groups := captureNamedGroups(s, numberPat)
if n := parseVersion(groups, false); n != nil {
return *n, nil
}
return Number{}, fmt.Errorf("invalid version %q", s)
}
func parseVersion(groups map[string]string, strict bool) *Number {
var n Number
// Major is always required
major := groups["major"]
if major == "" {
return nil
}
n.Major = atoi(major)
// Minor is only required in strict mode
minor := groups["minor"]
if minor == "" && strict {
return nil
} else if minor != "" {
n.Minor = atoi(minor)
}
// Patch is only required in strict mode. However there can be two
// possible patch groups depending on whether a tag is specified:
// - "patch" captures a standalone patch version (e.g. 1.2.3)
// - "patchInTag" captures a patch version as a suffix to tag (e.g. 1.2-tag3)
patch := groups["patch"]
if patch == "" {
patch = groups["patchInTag"] // try the alternative
}
if patch == "" && strict {
return nil
} else if patch != "" {
n.Patch = atoi(patch)
}
// Tag is always optional
n.Tag = groups["tag"]
// Build is always optional
build := groups["build"]
if build != "" {
n.Build = atoi(build)
}
return &n
}
func captureNamedGroups(s string, re *regexp.Regexp) map[string]string {
match := re.FindStringSubmatch(s)
results := map[string]string{}
groups := re.SubexpNames()
for i, name := range match {
results[groups[i]] = name
}
return results
}
// atoi is the same as strconv.Atoi but assumes that
// the string has been verified to be a valid integer.
func atoi(s string) int {
n, err := strconv.Atoi(s)
if err != nil {
panic(err)
}
return n
}
// String returns the string representation of this Number.
func (n Number) String() string {
var s string
if n.Tag == "" {
s = fmt.Sprintf("%d.%d.%d", n.Major, n.Minor, n.Patch)
} else {
s = fmt.Sprintf("%d.%d-%s%d", n.Major, n.Minor, n.Tag, n.Patch)
}
if n.Build > 0 {
s += fmt.Sprintf(".%d", n.Build)
}
return s
}
// Compare returns -1, 0 or 1 depending on whether
// n is less than, equal to or greater than other.
// The comparison compares Major, then Minor, then Patch, then Build, using the first difference as
func (n Number) Compare(other Number) int {
if n == other {
return 0
}
less := false
switch {
case n.Major != other.Major:
less = n.Major < other.Major
case n.Minor != other.Minor:
less = n.Minor < other.Minor
case n.Tag != other.Tag:
switch {
case n.Tag == "":
less = false
case other.Tag == "":
less = true
default:
less = n.Tag < other.Tag
}
case n.Patch != other.Patch:
less = n.Patch < other.Patch
case n.Build != other.Build:
less = n.Build < other.Build
}
if less {
return -1
}
return 1
}
// GetBSON implements bson.Getter.
func (n Number) GetBSON() (interface{}, error) {
return n.String(), nil
}
// SetBSON implements bson.Setter.
func (n *Number) SetBSON(raw bson.Raw) error {
var s string
err := raw.Unmarshal(&s)
if err != nil {
return err
}
v, err := Parse(s)
if err != nil {
return err
}
*n = v
return nil
}
// MarshalJSON implements json.Marshaler.
func (n Number) MarshalJSON() ([]byte, error) {
return json.Marshal(n.String())
}
// UnmarshalJSON implements json.Unmarshaler.
func (n *Number) UnmarshalJSON(data []byte) error {
var s string
if err := json.Unmarshal(data, &s); err != nil {
return err
}
v, err := Parse(s)
if err != nil {
return err
}
*n = v
return nil
}
// MarshalYAML implements yaml.v2.Marshaller interface
func (n Number) MarshalYAML() (interface{}, error) {
return n.String(), nil
}
// UnmarshalYAML implements the yaml.Unmarshaller interface
func (n *Number) UnmarshalYAML(unmarshal func(interface{}) error) error {
var vstr string
err := unmarshal(&vstr)
if err != nil {
return err
}
v, err := Parse(vstr)
if err != nil {
return err
}
*n = v
return nil
}
// ToPatch returns back a semver Number (Major.Minor.Tag.Patch), without a build
// attached to the Number.
// In some scenarios it's prefable to not have the build number to identity a
// version and instead use a less qualified Number. Being less specific about
// exactness allows us to be more flexible about compatible with other versions.
func (n Number) ToPatch() Number {
return Number{
Major: n.Major,
Minor: n.Minor,
Patch: n.Patch,
Tag: n.Tag,
}
}
// ParseMajorMinor takes an argument of the form "major.minor" and returns ints major and minor.
func ParseMajorMinor(vers string) (int, int, error) {
parts := strings.Split(vers, ".")
major, err := strconv.Atoi(parts[0])
minor := -1
if err != nil {
return -1, -1, fmt.Errorf("invalid major version number %s: %v", parts[0], err)
}
if len(parts) == 2 {
minor, err = strconv.Atoi(parts[1])
if err != nil {
return -1, -1, fmt.Errorf("invalid minor version number %s: %v", parts[1], err)
}
} else if len(parts) > 2 {
return -1, -1, fmt.Errorf("invalid major.minor version number %s", vers)
}
return major, minor, nil
}