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zeekayandHanzo Dev
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Source files keep their SPDX-License-Identifier and Hanzo copyright line; the Gitea, Gogs and LFS Test Server copyrights they used to repeat now live once in NOTICE, alongside LICENSE. The header lint accepts any copyright line above the SPDX line, so it no longer demands an upstream one. Co-authored-by: Hanzo Dev <[email protected]>
106 lines
1.8 KiB
Go
106 lines
1.8 KiB
Go
// Copyright 2026 Hanzo AI, Inc. All rights reserved.
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// SPDX-License-Identifier: MIT
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package arch
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import (
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"strconv"
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"strings"
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"unicode"
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)
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// https://gitlab.archlinux.org/pacman/pacman/-/blob/d55b47e5512808b67bc944feb20c2bcc6c1a4c45/lib/libalpm/version.c
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func parseEVR(evr string) (epoch, version, release string) {
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if before, after, f := strings.Cut(evr, ":"); f {
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epoch = before
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evr = after
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} else {
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epoch = "0"
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}
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if before, after, f := strings.Cut(evr, "-"); f {
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version = before
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release = after
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} else {
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version = evr
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release = "1"
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}
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return epoch, version, release
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}
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func compareSegments(a, b []string) int {
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lenA, lenB := len(a), len(b)
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l := min(lenA, lenB)
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for i := range l {
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if r := compare(a[i], b[i]); r != 0 {
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return r
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}
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}
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if lenA == lenB {
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return 0
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} else if l == lenA {
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return -1
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}
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return 1
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}
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func compare(a, b string) int {
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if a == b {
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return 0
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}
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aNumeric := isNumeric(a)
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bNumeric := isNumeric(b)
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if aNumeric && bNumeric {
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aInt, _ := strconv.Atoi(a)
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bInt, _ := strconv.Atoi(b)
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switch {
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case aInt < bInt:
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return -1
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case aInt > bInt:
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return 1
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default:
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return 0
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}
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}
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if aNumeric {
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return 1
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}
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if bNumeric {
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return -1
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}
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return strings.Compare(a, b)
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}
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func isNumeric(s string) bool {
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for _, c := range s {
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if !unicode.IsDigit(c) {
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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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func compareVersions(a, b string) int {
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if a == b {
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return 0
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}
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epochA, versionA, releaseA := parseEVR(a)
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epochB, versionB, releaseB := parseEVR(b)
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if res := compareSegments([]string{epochA}, []string{epochB}); res != 0 {
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return res
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}
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if res := compareSegments(strings.Split(versionA, "."), strings.Split(versionB, ".")); res != 0 {
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return res
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}
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return compareSegments([]string{releaseA}, []string{releaseB})
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}
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