mirror of
https://github.com/go-gitea/gitea
synced 2024-08-17 12:50:52 +02:00
389 lines
8.5 KiB
Go
Vendored
389 lines
8.5 KiB
Go
Vendored
// Copyright 2018 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// Package semver implements comparison of semantic version strings.
|
|
// In this package, semantic version strings must begin with a leading "v",
|
|
// as in "v1.0.0".
|
|
//
|
|
// The general form of a semantic version string accepted by this package is
|
|
//
|
|
// vMAJOR[.MINOR[.PATCH[-PRERELEASE][+BUILD]]]
|
|
//
|
|
// where square brackets indicate optional parts of the syntax;
|
|
// MAJOR, MINOR, and PATCH are decimal integers without extra leading zeros;
|
|
// PRERELEASE and BUILD are each a series of non-empty dot-separated identifiers
|
|
// using only alphanumeric characters and hyphens; and
|
|
// all-numeric PRERELEASE identifiers must not have leading zeros.
|
|
//
|
|
// This package follows Semantic Versioning 2.0.0 (see semver.org)
|
|
// with two exceptions. First, it requires the "v" prefix. Second, it recognizes
|
|
// vMAJOR and vMAJOR.MINOR (with no prerelease or build suffixes)
|
|
// as shorthands for vMAJOR.0.0 and vMAJOR.MINOR.0.
|
|
package semver
|
|
|
|
// parsed returns the parsed form of a semantic version string.
|
|
type parsed struct {
|
|
major string
|
|
minor string
|
|
patch string
|
|
short string
|
|
prerelease string
|
|
build string
|
|
err string
|
|
}
|
|
|
|
// IsValid reports whether v is a valid semantic version string.
|
|
func IsValid(v string) bool {
|
|
_, ok := parse(v)
|
|
return ok
|
|
}
|
|
|
|
// Canonical returns the canonical formatting of the semantic version v.
|
|
// It fills in any missing .MINOR or .PATCH and discards build metadata.
|
|
// Two semantic versions compare equal only if their canonical formattings
|
|
// are identical strings.
|
|
// The canonical invalid semantic version is the empty string.
|
|
func Canonical(v string) string {
|
|
p, ok := parse(v)
|
|
if !ok {
|
|
return ""
|
|
}
|
|
if p.build != "" {
|
|
return v[:len(v)-len(p.build)]
|
|
}
|
|
if p.short != "" {
|
|
return v + p.short
|
|
}
|
|
return v
|
|
}
|
|
|
|
// Major returns the major version prefix of the semantic version v.
|
|
// For example, Major("v2.1.0") == "v2".
|
|
// If v is an invalid semantic version string, Major returns the empty string.
|
|
func Major(v string) string {
|
|
pv, ok := parse(v)
|
|
if !ok {
|
|
return ""
|
|
}
|
|
return v[:1+len(pv.major)]
|
|
}
|
|
|
|
// MajorMinor returns the major.minor version prefix of the semantic version v.
|
|
// For example, MajorMinor("v2.1.0") == "v2.1".
|
|
// If v is an invalid semantic version string, MajorMinor returns the empty string.
|
|
func MajorMinor(v string) string {
|
|
pv, ok := parse(v)
|
|
if !ok {
|
|
return ""
|
|
}
|
|
i := 1 + len(pv.major)
|
|
if j := i + 1 + len(pv.minor); j <= len(v) && v[i] == '.' && v[i+1:j] == pv.minor {
|
|
return v[:j]
|
|
}
|
|
return v[:i] + "." + pv.minor
|
|
}
|
|
|
|
// Prerelease returns the prerelease suffix of the semantic version v.
|
|
// For example, Prerelease("v2.1.0-pre+meta") == "-pre".
|
|
// If v is an invalid semantic version string, Prerelease returns the empty string.
|
|
func Prerelease(v string) string {
|
|
pv, ok := parse(v)
|
|
if !ok {
|
|
return ""
|
|
}
|
|
return pv.prerelease
|
|
}
|
|
|
|
// Build returns the build suffix of the semantic version v.
|
|
// For example, Build("v2.1.0+meta") == "+meta".
|
|
// If v is an invalid semantic version string, Build returns the empty string.
|
|
func Build(v string) string {
|
|
pv, ok := parse(v)
|
|
if !ok {
|
|
return ""
|
|
}
|
|
return pv.build
|
|
}
|
|
|
|
// Compare returns an integer comparing two versions according to
|
|
// semantic version precedence.
|
|
// The result will be 0 if v == w, -1 if v < w, or +1 if v > w.
|
|
//
|
|
// An invalid semantic version string is considered less than a valid one.
|
|
// All invalid semantic version strings compare equal to each other.
|
|
func Compare(v, w string) int {
|
|
pv, ok1 := parse(v)
|
|
pw, ok2 := parse(w)
|
|
if !ok1 && !ok2 {
|
|
return 0
|
|
}
|
|
if !ok1 {
|
|
return -1
|
|
}
|
|
if !ok2 {
|
|
return +1
|
|
}
|
|
if c := compareInt(pv.major, pw.major); c != 0 {
|
|
return c
|
|
}
|
|
if c := compareInt(pv.minor, pw.minor); c != 0 {
|
|
return c
|
|
}
|
|
if c := compareInt(pv.patch, pw.patch); c != 0 {
|
|
return c
|
|
}
|
|
return comparePrerelease(pv.prerelease, pw.prerelease)
|
|
}
|
|
|
|
// Max canonicalizes its arguments and then returns the version string
|
|
// that compares greater.
|
|
func Max(v, w string) string {
|
|
v = Canonical(v)
|
|
w = Canonical(w)
|
|
if Compare(v, w) > 0 {
|
|
return v
|
|
}
|
|
return w
|
|
}
|
|
|
|
func parse(v string) (p parsed, ok bool) {
|
|
if v == "" || v[0] != 'v' {
|
|
p.err = "missing v prefix"
|
|
return
|
|
}
|
|
p.major, v, ok = parseInt(v[1:])
|
|
if !ok {
|
|
p.err = "bad major version"
|
|
return
|
|
}
|
|
if v == "" {
|
|
p.minor = "0"
|
|
p.patch = "0"
|
|
p.short = ".0.0"
|
|
return
|
|
}
|
|
if v[0] != '.' {
|
|
p.err = "bad minor prefix"
|
|
ok = false
|
|
return
|
|
}
|
|
p.minor, v, ok = parseInt(v[1:])
|
|
if !ok {
|
|
p.err = "bad minor version"
|
|
return
|
|
}
|
|
if v == "" {
|
|
p.patch = "0"
|
|
p.short = ".0"
|
|
return
|
|
}
|
|
if v[0] != '.' {
|
|
p.err = "bad patch prefix"
|
|
ok = false
|
|
return
|
|
}
|
|
p.patch, v, ok = parseInt(v[1:])
|
|
if !ok {
|
|
p.err = "bad patch version"
|
|
return
|
|
}
|
|
if len(v) > 0 && v[0] == '-' {
|
|
p.prerelease, v, ok = parsePrerelease(v)
|
|
if !ok {
|
|
p.err = "bad prerelease"
|
|
return
|
|
}
|
|
}
|
|
if len(v) > 0 && v[0] == '+' {
|
|
p.build, v, ok = parseBuild(v)
|
|
if !ok {
|
|
p.err = "bad build"
|
|
return
|
|
}
|
|
}
|
|
if v != "" {
|
|
p.err = "junk on end"
|
|
ok = false
|
|
return
|
|
}
|
|
ok = true
|
|
return
|
|
}
|
|
|
|
func parseInt(v string) (t, rest string, ok bool) {
|
|
if v == "" {
|
|
return
|
|
}
|
|
if v[0] < '0' || '9' < v[0] {
|
|
return
|
|
}
|
|
i := 1
|
|
for i < len(v) && '0' <= v[i] && v[i] <= '9' {
|
|
i++
|
|
}
|
|
if v[0] == '0' && i != 1 {
|
|
return
|
|
}
|
|
return v[:i], v[i:], true
|
|
}
|
|
|
|
func parsePrerelease(v string) (t, rest string, ok bool) {
|
|
// "A pre-release version MAY be denoted by appending a hyphen and
|
|
// a series of dot separated identifiers immediately following the patch version.
|
|
// Identifiers MUST comprise only ASCII alphanumerics and hyphen [0-9A-Za-z-].
|
|
// Identifiers MUST NOT be empty. Numeric identifiers MUST NOT include leading zeroes."
|
|
if v == "" || v[0] != '-' {
|
|
return
|
|
}
|
|
i := 1
|
|
start := 1
|
|
for i < len(v) && v[i] != '+' {
|
|
if !isIdentChar(v[i]) && v[i] != '.' {
|
|
return
|
|
}
|
|
if v[i] == '.' {
|
|
if start == i || isBadNum(v[start:i]) {
|
|
return
|
|
}
|
|
start = i + 1
|
|
}
|
|
i++
|
|
}
|
|
if start == i || isBadNum(v[start:i]) {
|
|
return
|
|
}
|
|
return v[:i], v[i:], true
|
|
}
|
|
|
|
func parseBuild(v string) (t, rest string, ok bool) {
|
|
if v == "" || v[0] != '+' {
|
|
return
|
|
}
|
|
i := 1
|
|
start := 1
|
|
for i < len(v) {
|
|
if !isIdentChar(v[i]) && v[i] != '.' {
|
|
return
|
|
}
|
|
if v[i] == '.' {
|
|
if start == i {
|
|
return
|
|
}
|
|
start = i + 1
|
|
}
|
|
i++
|
|
}
|
|
if start == i {
|
|
return
|
|
}
|
|
return v[:i], v[i:], true
|
|
}
|
|
|
|
func isIdentChar(c byte) bool {
|
|
return 'A' <= c && c <= 'Z' || 'a' <= c && c <= 'z' || '0' <= c && c <= '9' || c == '-'
|
|
}
|
|
|
|
func isBadNum(v string) bool {
|
|
i := 0
|
|
for i < len(v) && '0' <= v[i] && v[i] <= '9' {
|
|
i++
|
|
}
|
|
return i == len(v) && i > 1 && v[0] == '0'
|
|
}
|
|
|
|
func isNum(v string) bool {
|
|
i := 0
|
|
for i < len(v) && '0' <= v[i] && v[i] <= '9' {
|
|
i++
|
|
}
|
|
return i == len(v)
|
|
}
|
|
|
|
func compareInt(x, y string) int {
|
|
if x == y {
|
|
return 0
|
|
}
|
|
if len(x) < len(y) {
|
|
return -1
|
|
}
|
|
if len(x) > len(y) {
|
|
return +1
|
|
}
|
|
if x < y {
|
|
return -1
|
|
} else {
|
|
return +1
|
|
}
|
|
}
|
|
|
|
func comparePrerelease(x, y string) int {
|
|
// "When major, minor, and patch are equal, a pre-release version has
|
|
// lower precedence than a normal version.
|
|
// Example: 1.0.0-alpha < 1.0.0.
|
|
// Precedence for two pre-release versions with the same major, minor,
|
|
// and patch version MUST be determined by comparing each dot separated
|
|
// identifier from left to right until a difference is found as follows:
|
|
// identifiers consisting of only digits are compared numerically and
|
|
// identifiers with letters or hyphens are compared lexically in ASCII
|
|
// sort order. Numeric identifiers always have lower precedence than
|
|
// non-numeric identifiers. A larger set of pre-release fields has a
|
|
// higher precedence than a smaller set, if all of the preceding
|
|
// identifiers are equal.
|
|
// Example: 1.0.0-alpha < 1.0.0-alpha.1 < 1.0.0-alpha.beta <
|
|
// 1.0.0-beta < 1.0.0-beta.2 < 1.0.0-beta.11 < 1.0.0-rc.1 < 1.0.0."
|
|
if x == y {
|
|
return 0
|
|
}
|
|
if x == "" {
|
|
return +1
|
|
}
|
|
if y == "" {
|
|
return -1
|
|
}
|
|
for x != "" && y != "" {
|
|
x = x[1:] // skip - or .
|
|
y = y[1:] // skip - or .
|
|
var dx, dy string
|
|
dx, x = nextIdent(x)
|
|
dy, y = nextIdent(y)
|
|
if dx != dy {
|
|
ix := isNum(dx)
|
|
iy := isNum(dy)
|
|
if ix != iy {
|
|
if ix {
|
|
return -1
|
|
} else {
|
|
return +1
|
|
}
|
|
}
|
|
if ix {
|
|
if len(dx) < len(dy) {
|
|
return -1
|
|
}
|
|
if len(dx) > len(dy) {
|
|
return +1
|
|
}
|
|
}
|
|
if dx < dy {
|
|
return -1
|
|
} else {
|
|
return +1
|
|
}
|
|
}
|
|
}
|
|
if x == "" {
|
|
return -1
|
|
} else {
|
|
return +1
|
|
}
|
|
}
|
|
|
|
func nextIdent(x string) (dx, rest string) {
|
|
i := 0
|
|
for i < len(x) && x[i] != '.' {
|
|
i++
|
|
}
|
|
return x[:i], x[i:]
|
|
}
|