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versioning.go
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versioning.go
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// Package versioning is a version comparison tool that conforms to semantic version 2.0.0
//
// Copyright 2022 AndeyaLee Author. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package versioning
import (
"errors"
"strconv"
)
// SemVer semantic version object
// via https://semver.org/
type SemVer struct {
major string
minor string
patch string
metadata string
nums [3]uint32
}
// Create creates a semantic version object.
func Create(major, minor, patch uint32, metadata string) *SemVer {
return &SemVer{
major: uint32ToString(major),
minor: uint32ToString(minor),
patch: uint32ToString(patch),
metadata: metadata,
nums: [3]uint32{
major, minor, patch,
},
}
}
// Parse parses the semantic version string to object.
// NOTE:
// If metadata part exists, the separator must not be a number.
func Parse(semVer string) (*SemVer, error) {
a := [4][]rune{}
var i int
for _, r := range semVer {
switch {
case i == 3 || (r >= '0' && r <= '9'):
a[i] = append(a[i], r)
case r == '.':
if i < 3 {
i++
}
default:
i = 3
a[i] = append(a[i], r)
}
}
for _, s := range a[:3] {
if len(s) == 0 {
return nil, errors.New("invalid semantic version 2: " + semVer)
}
}
return &SemVer{
major: string(a[0]),
minor: string(a[1]),
patch: string(a[2]),
metadata: string(a[3]),
nums: [3]uint32{
runeToUint32(a[0]),
runeToUint32(a[1]),
runeToUint32(a[2]),
},
}, nil
}
// Compare compares 'a' and 'b'.
// The result will be 0 if a==b, -1 if a < b, and +1 if a > b.
// If compareMetadata==nil, will not compare metadata.
func Compare(a, b string, compareMetadata func(aMeta, bMeta string) int) (int, error) {
ver1, err := Parse(a)
if err != nil {
return 0, err
}
ver2, err := Parse(b)
if err != nil {
return 0, err
}
return ver1.Compare(ver2, compareMetadata), nil
}
// Compare compares whether 's' and 'semVer'.
// The result will be 0 if s==semVer, -1 if s < semVer, and +1 if s > semVer.
// If compareMetadata==nil, will not compare metadata.
func (s *SemVer) Compare(semVer *SemVer, compareMetadata func(sMeta, semVerMeta string) int) int {
for k, v := range s.nums {
v2 := semVer.nums[k]
if v < v2 {
return -1
} else if v > v2 {
return 1
}
}
if compareMetadata != nil {
return compareMetadata(s.Metadata(), semVer.Metadata())
}
return 0
}
// Major returns the version major.
func (s *SemVer) Major() string {
return s.major
}
// Minor returns the version minor.
func (s *SemVer) Minor() string {
return s.minor
}
// Patch returns the version patch.
func (s *SemVer) Patch() string {
return s.patch
}
// Metadata returns the version metadata.
// Examples:
// 1.0.0-alpha+001 => -alpha+001
// 1.0.0+20130313144700 => +20130313144700
// 1.0.0-beta+exp.sha.5114f85 => -beta+exp.sha.5114f85
// 1.0.0rc => rc
func (s *SemVer) Metadata() string {
return s.metadata
}
// String returns the version string.
func (s *SemVer) String() string {
var ver = s.major
if s.minor != "" {
ver += "." + s.minor
}
if s.patch != "" {
ver += "." + s.patch
}
return ver + s.metadata
}
func uint32ToString(u uint32) string {
return strconv.FormatUint(uint64(u), 10)
}
func runeToUint32(r []rune) uint32 {
var p = 1
var u int
for i := len(r) - 1; i >= 0; i-- {
u += int(r[i]-'0') * p
p *= 10
}
return uint32(u)
}