version

Overview ¶

Package version tokenizes a apk package version using the same algorithm as apk-tools uses.

A valid version can be described by the following EBNF specificion:

version     = digits , { "." , digits } , [ letter, digits ] , { suffix } , [ revision ] ;

digit       = "0" | "1" | "2" | "3"| "4" | "5" | "6" | "7" | "8" | "9" ;
digits      = { digit } ;
revision    = "-r", digit, digits ;

letter      = "a" | "b" | "c" | "d" | "e" | "f" | "g" | "h" | "i" | "j" | "k" | "l" | "m"
            | "n" | "o" | "p" | "q" | "r" | "s" | "t" | "u" | "v" | "w" | "x" | "y" | "z" ;

suffix      = "_" , ( pre-suffix | post-suffix ) , digits ;

pre-suffix  = "alpha" | "beta" | "pre" | "rc" ;
post-suffix = "cvc" | "svn" | "git" | "hg" | "p" ;

package main

import (
	"fmt"

	"gitlab.alpinelinux.org/alpine/go/version"
)

func main() {
	v := version.Version("1.2.3-r0")

	nv := &v
	t := version.Digit
	var pt version.Token

	var q int64
	for t != version.End {
		pt = t
		t, nv, q = nv.GetToken(t)
		if pt == version.Digit {
			fmt.Printf("%d\n", q)
		}
		if pt == version.RevisionDigit {
			fmt.Printf("r%d\n", q)
		}
	}

}

Output:

1
2
3
r0