53 lines
1.9 KiB
Go
53 lines
1.9 KiB
Go
// Copyright 2023 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 versions
|
|
|
|
// Note: If we use build tags to use go/versions when go >=1.22,
|
|
// we run into go.dev/issue/53737. Under some operations users would see an
|
|
// import of "go/versions" even if they would not compile the file.
|
|
// For example, during `go get -u ./...` (go.dev/issue/64490) we do not try to include
|
|
// For this reason, this library just a clone of go/versions for the moment.
|
|
|
|
// Lang returns the Go language version for version x.
|
|
// If x is not a valid version, Lang returns the empty string.
|
|
// For example:
|
|
//
|
|
// Lang("go1.21rc2") = "go1.21"
|
|
// Lang("go1.21.2") = "go1.21"
|
|
// Lang("go1.21") = "go1.21"
|
|
// Lang("go1") = "go1"
|
|
// Lang("bad") = ""
|
|
// Lang("1.21") = ""
|
|
func Lang(x string) string {
|
|
v := lang(stripGo(x))
|
|
if v == "" {
|
|
return ""
|
|
}
|
|
return x[:2+len(v)] // "go"+v without allocation
|
|
}
|
|
|
|
// Compare returns -1, 0, or +1 depending on whether
|
|
// x < y, x == y, or x > y, interpreted as Go versions.
|
|
// The versions x and y must begin with a "go" prefix: "go1.21" not "1.21".
|
|
// Invalid versions, including the empty string, compare less than
|
|
// valid versions and equal to each other.
|
|
// The language version "go1.21" compares less than the
|
|
// release candidate and eventual releases "go1.21rc1" and "go1.21.0".
|
|
// Custom toolchain suffixes are ignored during comparison:
|
|
// "go1.21.0" and "go1.21.0-bigcorp" are equal.
|
|
func Compare(x, y string) int { return compare(stripGo(x), stripGo(y)) }
|
|
|
|
// IsValid reports whether the version x is valid.
|
|
func IsValid(x string) bool { return isValid(stripGo(x)) }
|
|
|
|
// stripGo converts from a "go1.21" version to a "1.21" version.
|
|
// If v does not start with "go", stripGo returns the empty string (a known invalid version).
|
|
func stripGo(v string) string {
|
|
if len(v) < 2 || v[:2] != "go" {
|
|
return ""
|
|
}
|
|
return v[2:]
|
|
}
|