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path: root/vendor/cloud.google.com/go/internal/version/version.go
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// Copyright 2016 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//go:generate ./update_version.sh

// Package version contains version information for Google Cloud Client
// Libraries for Go, as reported in request headers.
package version

import (
    "runtime"
    "strings"
    "unicode"
)

// Repo is the current version of the client libraries in this
// repo. It should be a date in YYYYMMDD format.
const Repo = "20180226"

// Go returns the Go runtime version. The returned string
// has no whitespace.
func Go() string {
    return goVersion
}

var goVersion = goVer(runtime.Version())

const develPrefix = "devel +"

func goVer(s string) string {
    if strings.HasPrefix(s, develPrefix) {
        s = s[len(develPrefix):]
        if p := strings.IndexFunc(s, unicode.IsSpace); p >= 0 {
            s = s[:p]
        }
        return s
    }

    if strings.HasPrefix(s, "go1") {
        s = s[2:]
        var prerelease string
        if p := strings.IndexFunc(s, notSemverRune); p >= 0 {
            s, prerelease = s[:p], s[p:]
        }
        if strings.HasSuffix(s, ".") {
            s += "0"
        } else if strings.Count(s, ".") < 2 {
            s += ".0"
        }
        if prerelease != "" {
            s += "-" + prerelease
        }
        return s
    }
    return ""
}

func notSemverRune(r rune) bool {
    return strings.IndexRune("0123456789.", r) < 0
}