376 lines
9.1 KiB
Go
376 lines
9.1 KiB
Go
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package semver
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import (
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"bytes"
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"errors"
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"fmt"
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"regexp"
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"strconv"
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"strings"
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)
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// The compiled version of the regex created at init() is cached here so it
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// only needs to be created once.
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var versionRegex *regexp.Regexp
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var validPrereleaseRegex *regexp.Regexp
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var (
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// ErrInvalidSemVer is returned a version is found to be invalid when
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// being parsed.
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ErrInvalidSemVer = errors.New("Invalid Semantic Version")
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// ErrInvalidMetadata is returned when the metadata is an invalid format
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ErrInvalidMetadata = errors.New("Invalid Metadata string")
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// ErrInvalidPrerelease is returned when the pre-release is an invalid format
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ErrInvalidPrerelease = errors.New("Invalid Prerelease string")
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)
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// SemVerRegex is the regular expression used to parse a semantic version.
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const SemVerRegex string = `v?([0-9]+)(\.[0-9]+)?(\.[0-9]+)?` +
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`(-([0-9A-Za-z\-]+(\.[0-9A-Za-z\-]+)*))?` +
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`(\+([0-9A-Za-z\-]+(\.[0-9A-Za-z\-]+)*))?`
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// ValidPrerelease is the regular expression which validates
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// both prerelease and metadata values.
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const ValidPrerelease string = `^([0-9A-Za-z\-]+(\.[0-9A-Za-z\-]+)*)`
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// Version represents a single semantic version.
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type Version struct {
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major, minor, patch int64
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pre string
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metadata string
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original string
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}
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func init() {
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versionRegex = regexp.MustCompile("^" + SemVerRegex + "$")
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validPrereleaseRegex = regexp.MustCompile(ValidPrerelease)
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}
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// NewVersion parses a given version and returns an instance of Version or
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// an error if unable to parse the version.
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func NewVersion(v string) (*Version, error) {
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m := versionRegex.FindStringSubmatch(v)
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if m == nil {
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return nil, ErrInvalidSemVer
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}
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sv := &Version{
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metadata: m[8],
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pre: m[5],
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original: v,
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}
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var temp int64
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temp, err := strconv.ParseInt(m[1], 10, 32)
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if err != nil {
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return nil, fmt.Errorf("Error parsing version segment: %s", err)
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}
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sv.major = temp
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if m[2] != "" {
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temp, err = strconv.ParseInt(strings.TrimPrefix(m[2], "."), 10, 32)
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if err != nil {
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return nil, fmt.Errorf("Error parsing version segment: %s", err)
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}
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sv.minor = temp
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} else {
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sv.minor = 0
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}
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if m[3] != "" {
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temp, err = strconv.ParseInt(strings.TrimPrefix(m[3], "."), 10, 32)
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if err != nil {
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return nil, fmt.Errorf("Error parsing version segment: %s", err)
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}
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sv.patch = temp
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} else {
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sv.patch = 0
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}
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return sv, nil
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}
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// MustParse parses a given version and panics on error.
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func MustParse(v string) *Version {
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sv, err := NewVersion(v)
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if err != nil {
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panic(err)
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}
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return sv
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}
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// String converts a Version object to a string.
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// Note, if the original version contained a leading v this version will not.
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// See the Original() method to retrieve the original value. Semantic Versions
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// don't contain a leading v per the spec. Instead it's optional on
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// impelementation.
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func (v *Version) String() string {
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var buf bytes.Buffer
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fmt.Fprintf(&buf, "%d.%d.%d", v.major, v.minor, v.patch)
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if v.pre != "" {
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fmt.Fprintf(&buf, "-%s", v.pre)
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}
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if v.metadata != "" {
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fmt.Fprintf(&buf, "+%s", v.metadata)
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}
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return buf.String()
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}
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// Original returns the original value passed in to be parsed.
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func (v *Version) Original() string {
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return v.original
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}
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// Major returns the major version.
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func (v *Version) Major() int64 {
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return v.major
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}
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// Minor returns the minor version.
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func (v *Version) Minor() int64 {
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return v.minor
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}
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// Patch returns the patch version.
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func (v *Version) Patch() int64 {
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return v.patch
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}
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// Prerelease returns the pre-release version.
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func (v *Version) Prerelease() string {
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return v.pre
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}
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// Metadata returns the metadata on the version.
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func (v *Version) Metadata() string {
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return v.metadata
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}
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// originalVPrefix returns the original 'v' prefix if any.
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func (v *Version) originalVPrefix() string {
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// Note, only lowercase v is supported as a prefix by the parser.
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if v.original != "" && v.original[:1] == "v" {
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return v.original[:1]
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}
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return ""
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}
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// IncPatch produces the next patch version.
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// If the current version does not have prerelease/metadata information,
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// it unsets metadata and prerelease values, increments patch number.
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// If the current version has any of prerelease or metadata information,
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// it unsets both values and keeps curent patch value
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func (v Version) IncPatch() Version {
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vNext := v
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// according to http://semver.org/#spec-item-9
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// Pre-release versions have a lower precedence than the associated normal version.
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// according to http://semver.org/#spec-item-10
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// Build metadata SHOULD be ignored when determining version precedence.
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if v.pre != "" {
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vNext.metadata = ""
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vNext.pre = ""
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} else {
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vNext.metadata = ""
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vNext.pre = ""
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vNext.patch = v.patch + 1
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}
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vNext.original = v.originalVPrefix() + "" + vNext.String()
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return vNext
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}
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// IncMinor produces the next minor version.
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// Sets patch to 0.
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// Increments minor number.
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// Unsets metadata.
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// Unsets prerelease status.
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func (v Version) IncMinor() Version {
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vNext := v
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vNext.metadata = ""
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vNext.pre = ""
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vNext.patch = 0
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vNext.minor = v.minor + 1
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vNext.original = v.originalVPrefix() + "" + vNext.String()
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return vNext
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}
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// IncMajor produces the next major version.
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// Sets patch to 0.
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// Sets minor to 0.
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// Increments major number.
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// Unsets metadata.
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// Unsets prerelease status.
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func (v Version) IncMajor() Version {
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vNext := v
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vNext.metadata = ""
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vNext.pre = ""
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vNext.patch = 0
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vNext.minor = 0
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vNext.major = v.major + 1
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vNext.original = v.originalVPrefix() + "" + vNext.String()
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return vNext
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}
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// SetPrerelease defines the prerelease value.
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// Value must not include the required 'hypen' prefix.
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func (v Version) SetPrerelease(prerelease string) (Version, error) {
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vNext := v
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if len(prerelease) > 0 && !validPrereleaseRegex.MatchString(prerelease) {
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return vNext, ErrInvalidPrerelease
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}
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vNext.pre = prerelease
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vNext.original = v.originalVPrefix() + "" + vNext.String()
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return vNext, nil
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}
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// SetMetadata defines metadata value.
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// Value must not include the required 'plus' prefix.
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func (v Version) SetMetadata(metadata string) (Version, error) {
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vNext := v
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if len(metadata) > 0 && !validPrereleaseRegex.MatchString(metadata) {
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return vNext, ErrInvalidMetadata
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}
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vNext.metadata = metadata
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vNext.original = v.originalVPrefix() + "" + vNext.String()
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return vNext, nil
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}
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// LessThan tests if one version is less than another one.
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func (v *Version) LessThan(o *Version) bool {
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return v.Compare(o) < 0
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}
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// GreaterThan tests if one version is greater than another one.
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func (v *Version) GreaterThan(o *Version) bool {
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return v.Compare(o) > 0
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}
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// Equal tests if two versions are equal to each other.
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// Note, versions can be equal with different metadata since metadata
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// is not considered part of the comparable version.
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func (v *Version) Equal(o *Version) bool {
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return v.Compare(o) == 0
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}
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// Compare compares this version to another one. It returns -1, 0, or 1 if
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// the version smaller, equal, or larger than the other version.
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//
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// Versions are compared by X.Y.Z. Build metadata is ignored. Prerelease is
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// lower than the version without a prerelease.
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func (v *Version) Compare(o *Version) int {
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// Compare the major, minor, and patch version for differences. If a
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// difference is found return the comparison.
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if d := compareSegment(v.Major(), o.Major()); d != 0 {
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return d
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}
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if d := compareSegment(v.Minor(), o.Minor()); d != 0 {
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return d
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}
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if d := compareSegment(v.Patch(), o.Patch()); d != 0 {
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return d
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}
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// At this point the major, minor, and patch versions are the same.
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ps := v.pre
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po := o.Prerelease()
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if ps == "" && po == "" {
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return 0
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}
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if ps == "" {
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return 1
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}
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if po == "" {
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return -1
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}
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return comparePrerelease(ps, po)
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}
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func compareSegment(v, o int64) int {
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if v < o {
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return -1
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}
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if v > o {
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return 1
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}
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return 0
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}
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func comparePrerelease(v, o string) int {
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// split the prelease versions by their part. The separator, per the spec,
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// is a .
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sparts := strings.Split(v, ".")
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oparts := strings.Split(o, ".")
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// Find the longer length of the parts to know how many loop iterations to
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// go through.
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slen := len(sparts)
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olen := len(oparts)
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l := slen
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if olen > slen {
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l = olen
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}
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// Iterate over each part of the prereleases to compare the differences.
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for i := 0; i < l; i++ {
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// Since the lentgh of the parts can be different we need to create
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// a placeholder. This is to avoid out of bounds issues.
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stemp := ""
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if i < slen {
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stemp = sparts[i]
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}
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otemp := ""
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if i < olen {
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otemp = oparts[i]
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}
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d := comparePrePart(stemp, otemp)
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if d != 0 {
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return d
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}
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}
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// Reaching here means two versions are of equal value but have different
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// metadata (the part following a +). They are not identical in string form
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// but the version comparison finds them to be equal.
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return 0
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}
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func comparePrePart(s, o string) int {
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// Fastpath if they are equal
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if s == o {
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return 0
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}
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// When s or o are empty we can use the other in an attempt to determine
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// the response.
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if o == "" {
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_, n := strconv.ParseInt(s, 10, 64)
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if n != nil {
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return -1
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}
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return 1
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}
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if s == "" {
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_, n := strconv.ParseInt(o, 10, 64)
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if n != nil {
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return 1
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}
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return -1
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}
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if s > o {
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return 1
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}
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return -1
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}
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