Source file src/google.golang.org/api/internal/gensupport/version.go

Documentation: google.golang.org/api/internal/gensupport

     1  // Copyright 2020 Google LLC. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package gensupport
     6  
     7  import (
     8  	"runtime"
     9  	"strings"
    10  	"unicode"
    11  )
    12  
    13  // GoVersion returns the Go runtime version. The returned string
    14  // has no whitespace.
    15  func GoVersion() string {
    16  	return goVersion
    17  }
    18  
    19  var goVersion = goVer(runtime.Version())
    20  
    21  const develPrefix = "devel +"
    22  
    23  func goVer(s string) string {
    24  	if strings.HasPrefix(s, develPrefix) {
    25  		s = s[len(develPrefix):]
    26  		if p := strings.IndexFunc(s, unicode.IsSpace); p >= 0 {
    27  			s = s[:p]
    28  		}
    29  		return s
    30  	}
    31  
    32  	if strings.HasPrefix(s, "go1") {
    33  		s = s[2:]
    34  		var prerelease string
    35  		if p := strings.IndexFunc(s, notSemverRune); p >= 0 {
    36  			s, prerelease = s[:p], s[p:]
    37  		}
    38  		if strings.HasSuffix(s, ".") {
    39  			s += "0"
    40  		} else if strings.Count(s, ".") < 2 {
    41  			s += ".0"
    42  		}
    43  		if prerelease != "" {
    44  			s += "-" + prerelease
    45  		}
    46  		return s
    47  	}
    48  	return ""
    49  }
    50  
    51  func notSemverRune(r rune) bool {
    52  	return !strings.ContainsRune("0123456789.", r)
    53  }
    54  

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