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package version
import (
"regexp"
"strconv"
"strings"
)
var regexpSigns = regexp.MustCompile(`[_\-+]`)
var regexpDotBeforeDigit = regexp.MustCompile(`([^.\d]+)`)
var regexpMultipleDots = regexp.MustCompile(`\.{2,}`)
var specialForms = map[string]int{
"dev": -6,
"alpha": -5,
"a": -5,
"beta": -4,
"b": -4,
"RC": -3,
"rc": -3,
"#": -2,
"p": 1,
"pl": 1,
}
// Compares two version number strings, for a particular relationship
//
// Usage
// version.Compare("2.3.4", "v3.1.2", "<")
// Returns: true
//
// version.Compare("1.0rc1", "1.0", ">=")
// Returns: false
func Compare(version1, version2, operator string) bool {
version1N := Normalize(version1)
version2N := Normalize(version2)
return CompareNormalized(version1N, version2N, operator)
}
// Compares two normalizated version number strings, for a particular relationship
//
// The function first replaces _, - and + with a dot . in the version strings
// and also inserts dots . before and after any non number so that for example
// '4.3.2RC1' becomes '4.3.2.RC.1'.
//
// Then it splits the results like if you were using Split(version, '.').
// Then it compares the parts starting from left to right. If a part contains
// special version strings these are handled in the following order: any string
// not found in this list:
// < dev < alpha = a < beta = b < RC = rc < # < pl = p.
//
// Usage
// version.CompareNormalized("1.0-dev", "1.0", "<")
// Returns: true
//
// version.CompareNormalized("1.0rc1", "1.0", ">=")
// Returns: false
//
// version.CompareNormalized("1.0", "1.0b1", "ge")
// Returns: true
func CompareNormalized(version1, version2, operator string) bool {
compare := CompareSimple(version1, version2)
switch {
case operator == ">" || operator == "gt":
return compare > 0
case operator == ">=" || operator == "ge":
return compare >= 0
case operator == "<=" || operator == "le":
return compare <= 0
case operator == "==" || operator == "=" || operator == "eq":
return compare == 0
case operator == "<>" || operator == "!=" || operator == "ne":
return compare != 0
case operator == "" || operator == "<" || operator == "lt":
return compare < 0
}
return false
}
// Compares two normalizated version number strings
//
// Just the same of CompareVersion but return a int result, 0 if both version
// are equal, 1 if the right side is bigger and -1 if the right side is lower
//
// Usage
// version.CompareSimple("1.2", "1.0.1")
// Returns: 1
//
// version.CompareSimple("1.0rc1", "1.0")
// Returns: -1
func CompareSimple(version1, version2 string) int {
var x, r, l int = 0, 0, 0
v1, v2 := prepVersion(version1), prepVersion(version2)
len1, len2 := len(v1), len(v2)
if len1 > len2 {
x = len1
} else {
x = len2
}
for i := 0; i < x; i++ {
if i < len1 && i < len2 {
if v1[i] == v2[i] {
continue
}
}
r = 0
if i < len1 {
r = numVersion(v1[i])
}
l = 0
if i < len2 {
l = numVersion(v2[i])
}
if r < l {
return -1
} else if r > l {
return 1
}
}
return 0
}
func prepVersion(version string) []string {
if len(version) == 0 {
return []string{""}
}
version = regexpSigns.ReplaceAllString(version, ".")
version = regexpDotBeforeDigit.ReplaceAllString(version, ".$1.")
version = regexpMultipleDots.ReplaceAllString(version, ".")
return strings.Split(version, ".")
}
func numVersion(value string) int {
if value == "" {
return 0
}
if number, err := strconv.Atoi(value); err == nil {
return number
}
if special, ok := specialForms[value]; ok {
return special
}
return -7
}
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