version

Documentation

Overview

Package version provides utilities for version number comparisons

Index

• type Version
  • func MustParseGeneric(str string) *Version
  • func MustParseSemantic(str string) *Version
  • func ParseGeneric(str string) (*Version, error)
  • func ParseSemantic(str string) (*Version, error)
  • func (v *Version) AtLeast(min *Version) bool
  • func (v *Version) BuildMetadata() string
  • func (v *Version) Compare(other string) (int, error)
  • func (v *Version) LessThan(other *Version) bool
  • func (v *Version) String() string

Types

type Version

type Version struct {
	// contains filtered or unexported fields
}

Version is an opqaue representation of a version number

func MustParseGeneric

func MustParseGeneric(str string) *Version

MustParseGeneric is like ParseGeneric except that it panics on error

func MustParseSemantic

func MustParseSemantic(str string) *Version

MustParseSemantic is like ParseSemantic except that it panics on error

func ParseGeneric

func ParseGeneric(str string) (*Version, error)

ParseGeneric parses a "generic" version string. The version string must consist of two or more dot-separated numeric fields (the first of which can't have leading zeroes), followed by arbitrary uninterpreted data (which need not be separated from the final numeric field by punctuation). For convenience, leading and trailing whitespace is ignored, and the version can be preceded by the letter "v". See also ParseSemantic.

func ParseSemantic

func ParseSemantic(str string) (*Version, error)

ParseSemantic parses a version string that exactly obeys the syntax and semantics of the "Semantic Versioning" specification (http://semver.org/) (although it ignores leading and trailing whitespace, and allows the version to be preceded by "v"). For version strings that are not guaranteed to obey the Semantic Versioning syntax, use ParseGeneric.

func (*Version) AtLeast

func (v *Version) AtLeast(min *Version) bool

AtLeast tests if a version is at least equal to a given minimum version. If both Versions are Semantic Versions, this will use the Semantic Version comparison algorithm. Otherwise, it will compare only the numeric components, with non-present components being considered "0" (ie, "1.4" is equal to "1.4.0").

func (*Version) BuildMetadata

func (v *Version) BuildMetadata() string

BuildMetadata returns the build metadata, if v is a Semantic Version, or ""

func (*Version) Compare

func (v *Version) Compare(other string) (int, error)

Compare compares v against a version string (which will be parsed as either Semantic or non-Semantic depending on v). On success it returns -1 if v is less than other, 1 if it is greater than other, or 0 if they are equal.

func (*Version) LessThan

func (v *Version) LessThan(other *Version) bool

LessThan tests if a version is less than a given version. (It is exactly the opposite of AtLeast, for situations where asking "is v too old?" makes more sense than asking "is v new enough?".)

func (*Version) String

func (v *Version) String() string

String converts a Version back to a string; note that for versions parsed with ParseGeneric, this will not include the trailing uninterpreted portion of the version number.