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