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// 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 version provides operations on [Go versions].
//
// [Go versions]: https://go.dev/doc/toolchain#version
package version // import "go/version"
import (
"internal/gover"
"strings"
)
// 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:]
}
// 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 := gover.Lang(stripGo(x))
if v == "" {
return ""
}
if strings.HasPrefix(x[2:], v) {
return x[:2+len(v)] // "go"+v without allocation
} else {
return "go" + v
}
}
// 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 gover.Compare(stripGo(x), stripGo(y))
}
// IsValid reports whether the version x is valid.
func IsValid(x string) bool {
return gover.IsValid(stripGo(x))
}
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