vendor/cloud.google.com/go/internal/version/version.go

   1 // Copyright 2016 Google LLC
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License");
   4 // you may not use this file except in compliance with the License.
   5 // You may obtain a copy of the License at
   6 //
   7 //      http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 // See the License for the specific language governing permissions and
  13 // limitations under the License.
  14
  15 //go:generate ./update_version.sh
  16
  17 // Package version contains version information for Google Cloud Client
  18 // Libraries for Go, as reported in request headers.
  19 package version
  20
  21 import (
  22         "runtime"
  23         "strings"
  24         "unicode"
  25 )
  26
  27 // Repo is the current version of the client libraries in this
  28 // repo. It should be a date in YYYYMMDD format.
  29 const Repo = "20180226"
  30
  31 // Go returns the Go runtime version. The returned string
  32 // has no whitespace.
  33 func Go() string {
  34         return goVersion
  35 }
  36
  37 var goVersion = goVer(runtime.Version())
  38
  39 const develPrefix = "devel +"
  40
  41 func goVer(s string) string {
  42         if strings.HasPrefix(s, develPrefix) {
  43                 s = s[len(develPrefix):]
  44                 if p := strings.IndexFunc(s, unicode.IsSpace); p >= 0 {
  45                         s = s[:p]
  46                 }
  47                 return s
  48         }
  49
  50         if strings.HasPrefix(s, "go1") {
  51                 s = s[2:]
  52                 var prerelease string
  53                 if p := strings.IndexFunc(s, notSemverRune); p >= 0 {
  54                         s, prerelease = s[:p], s[p:]
  55                 }
  56                 if strings.HasSuffix(s, ".") {
  57                         s += "0"
  58                 } else if strings.Count(s, ".") < 2 {
  59                         s += ".0"
  60                 }
  61                 if prerelease != "" {
  62                         s += "-" + prerelease
  63                 }
  64                 return s
  65         }
  66         return ""
  67 }
  68
  69 func notSemverRune(r rune) bool {
  70         return !strings.ContainsRune("0123456789.", r)
  71 }