Aneurin Barker Snook
118 lines
2.6 KiB
Go
118 lines
2.6 KiB
Go
package version
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import (
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"fmt"
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)
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// Version is a structured representation of a version number.
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type Version struct {
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Major int // Major version number.
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Minor int // Minor version number.
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Patch int // Patch version number.
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Extension string // Version extension, such as pre-release number or build metdata.
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Text string // Original version string, if this version was created via the Parse function.
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}
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// Compare this version (a) with another version (b).
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// This function returns -1 if a is less than b, 1 if a is greater than b, or 0 if a is equal to b.
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//
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// Extensions such as pre-release version or build metadata are ignored when comparing versions.
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func (a *Version) Compare(b *Version) int {
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if a == nil && b != nil {
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return -1
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} else if a != nil && b == nil {
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return 1
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} else if a == nil && b == nil {
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return 0
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}
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if a.Major == b.Major {
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if a.Minor == b.Minor {
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if a.Patch == b.Patch {
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return 0
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} else if a.Patch > b.Patch {
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return 1
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}
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} else if a.Minor > b.Minor {
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return 1
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}
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} else if a.Major > b.Major {
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return 1
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}
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return -1
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}
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// Equal checks for equality between two versions.
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//
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// Extensions such as pre-release version or build metadata are ignored when comparing versions.
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func (a *Version) Equal(b *Version) bool {
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return a.Compare(b) == 0
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}
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// Match tests the version against a constraint.
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// Gt and Lt take precedence over Gte and Lte.
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func (v *Version) Match(c *Constraint) bool {
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if v == nil {
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return false
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}
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if c == nil {
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return true
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}
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if c.Gt != nil {
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if v.Compare(c.Gt) <= 0 {
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return false
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}
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} else if c.Gte != nil {
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if v.Compare(c.Gte) < 0 {
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return false
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}
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}
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if c.Lt != nil {
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if v.Compare(c.Lt) >= 0 {
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return false
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}
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} else if c.Lte != nil {
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if v.Compare(c.Lte) > 0 {
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return false
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}
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}
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return true
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}
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// Less performs a simple comparison of this version (a) with another version (b).
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// This function returns true if a is less than b, or false otherwise.
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//
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// Extensions such as pre-release version or build metadata are ignored when comparing versions.
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func (a *Version) Less(b *Version) bool {
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return a.Compare(b) < 0
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}
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// SemanticString returns a version string conforming to the standard described in Semantic Versioning 2.0.0.
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//
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// See https://semver.org/#is-v123-a-semantic-version
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func (v *Version) SemanticString() string {
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if v == nil {
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return ""
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}
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return fmt.Sprintf("%d.%d.%d%s", v.Major, v.Minor, v.Patch, v.Extension)
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}
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func (v *Version) String() string {
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if v == nil {
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return ""
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}
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if v.Text != "" {
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return v.Text
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}
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return v.SemanticString()
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}
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