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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package semver provides shared utilities for manipulating
// Go semantic versions.
package semver
import (
"regexp"
"strings"
)
// addSemverPrefix adds a 'v' prefix to s if it isn't already prefixed
// with 'v' or 'go'. This allows us to easily test go-style SEMVER
// strings against normal SEMVER strings.
func addSemverPrefix(s string) string {
if !strings.HasPrefix(s, "v") && !strings.HasPrefix(s, "go") {
return "v" + s
}
return s
}
// removeSemverPrefix removes the 'v' or 'go' prefixes from go-style
// SEMVER strings, for usage in the public vulnerability format.
func removeSemverPrefix(s string) string {
s = strings.TrimPrefix(s, "v")
s = strings.TrimPrefix(s, "go")
return s
}
// CanonicalizeSemverPrefix turns a SEMVER string into the canonical
// representation using the 'v' prefix, as used by the OSV format.
// Input may be a bare SEMVER ("1.2.3"), Go prefixed SEMVER ("go1.2.3"),
// or already canonical SEMVER ("v1.2.3").
func CanonicalizeSemverPrefix(s string) string {
return addSemverPrefix(removeSemverPrefix(s))
}
var (
// Regexp for matching go tags. The groups are:
// 1 the major.minor version
// 2 the patch version, or empty if none
// 3 the entire prerelease, if present
// 4 the prerelease type ("beta" or "rc")
// 5 the prerelease number
tagRegexp = regexp.MustCompile(`^go(\d+\.\d+)(\.\d+|)((beta|rc|-pre)(\d+))?$`)
)
// This is a modified copy of pkgsite/internal/stdlib:VersionForTag.
func GoTagToSemver(tag string) string {
if tag == "" {
return ""
}
tag = strings.Fields(tag)[0]
// Special cases for go1.
if tag == "go1" {
return "v1.0.0"
}
if tag == "go1.0" {
return ""
}
m := tagRegexp.FindStringSubmatch(tag)
if m == nil {
return ""
}
version := "v" + m[1]
if m[2] != "" {
version += m[2]
} else {
version += ".0"
}
if m[3] != "" {
if !strings.HasPrefix(m[4], "-") {
version += "-"
}
version += m[4] + "." + m[5]
}
return version
}
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