versions

gistfile1.go

package main

import (
    "strconv"
    "strings"
)

type version []int

func parseVersion(s string) (version, error) {
        var v version
        for _, s := range strings.Split(s, ".") {
                i, err := strconv.Atoi(s)
                if err != nil {
                        return nil, err
                }
                v = append(v, i)
        }
        return v, nil
}

func (v1 version) compare(v2 version) int {
        if len(v2) > len(v1) {
                z := make([]int, len(v2) - len(v1))
                v1 = append(v1, z...)
        } else if len(v2) < len(v1) {
                z := make([]int, len(v1) - len(v2))
                v2 = append(v2, z...)
        }
        for i := 0; i < len(v1); i++ {
                if v1[i] != v2[i] {
                        if v1[i] < v2[i] {
                                return -1
                        }
                        return 1
                }
        }
        return 0
}