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semver.go
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semver.go
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// Copyright (c) 2016 The Decred developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package semver
import (
"fmt"
"regexp"
"strconv"
)
// NewSemver returns a new Semver with the version major.minor.patch
func NewSemver(major, minor, patch uint32) Semver {
return Semver{major, minor, patch}
}
// Semver models a semantic version (semver) major.minor.patch
type Semver struct {
major, minor, patch uint32
}
// Compatible decides if the actual version is compatible with the required one.
func Compatible(required, actual Semver) bool {
switch {
case required.major != actual.major:
return false
case required.minor > actual.minor:
return false
case required.minor == actual.minor && required.patch > actual.patch:
return false
default:
return true
}
}
// AnyCompatible checks if the version is compatible with any versions in a
// slice of versions.
func AnyCompatible(compatible []Semver, actual Semver) (isApiCompat bool) {
for _, v := range compatible {
if Compatible(v, actual) {
isApiCompat = true
break
}
}
return
}
func (s Semver) String() string {
return fmt.Sprintf("%d.%d.%d", s.major, s.minor, s.patch)
}
// Split returns the major, minor and patch version.
func (s *Semver) Split() (uint32, uint32, uint32) {
return s.major, s.minor, s.patch
}
// ParseVersionStr makes a *Semver from a version string (e.g. v3.1.0, 5.3.2,
// 7.3, etc.). The "v" prefix is optional, as are the minor and patch versions.
func ParseVersionStr(ver string) (*Semver, error) {
var v, m, p int
var err error
// If this matches a string, there will be 3 submatches in addition to the
// matched string in the result of FindStringSubmatch. Otherwise, there will
// result will be an empty slice.
re := regexp.MustCompile(`^v?(\d+)\.?(\d*)\.?(\d*)$`)
subs := re.FindStringSubmatch(ver)
if len(subs) != 4 {
return nil, fmt.Errorf("invalid version string")
}
// Matched the string and captured 3 substrings. Parse each substring, some
// of which may be empty. Empty substrings are treated as a 0.
// patch
if len(subs[3]) > 0 {
p, err = strconv.Atoi(subs[3])
if err != nil {
return nil, err
}
}
// minor
if len(subs[2]) > 0 {
m, err = strconv.Atoi(subs[2])
if err != nil {
return nil, err
}
}
// major
if len(subs[1]) > 0 {
v, err = strconv.Atoi(subs[1])
if err != nil {
return nil, err
}
}
s := NewSemver(uint32(v), uint32(m), uint32(p))
return &s, nil
}