version.go

Documentation: cloud.google.com/go/internal/version

     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 = "20201104"
    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  }
    72
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