package cmpver

import "tailscale.com/util/cmpver"

Package cmpver implements a variant of debian version number comparison.

A version is a string consisting of alternating non-numeric and numeric fields. When comparing two versions, each one is broken down into its respective fields, and the fields are compared pairwise. The comparison is lexicographic for non-numeric fields, numeric for numeric fields. The first non-equal field pair determines the ordering of the two versions.

This comparison scheme is a simplified version of Debian's version number comparisons. Debian differs in a few details of lexicographical field comparison, where certain characters have special meaning and ordering. We don't need that, because Tailscale version numbers don't need it.

Index ¶

• func Compare(v1, v2 string) int
• func Less(v1, v2 string) bool
• func LessEq(v1, v2 string) bool

Functions ¶

func Compare ¶

func Compare(v1, v2 string) int

Compare returns an integer comparing two strings as version numbers. The result will be -1, 0, or 1 representing the sign of v1 - v2:

Compare(v1, v2)  < 0  if v1  < v2
                == 0  if v1 == v2
                 > 0  if v1  > v2

func Less ¶

func Less(v1, v2 string) bool

Less reports whether v1 is less than v2.

Note that "12" is less than "12.0".

func LessEq ¶

func LessEq(v1, v2 string) bool

LessEq reports whether v1 is less than or equal to v2.

Note that "12" is less than "12.0".

Source Files ¶

version.go