github.com/aclisp/heapster@v0.19.2-0.20160613100040-51756f899a96/Godeps/_workspace/src/k8s.io/kubernetes/pkg/version/semver.go (about)

     1  /*
     2  Copyright 2015 The Kubernetes Authors All rights reserved.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package version
    18  
    19  import (
    20  	"strings"
    21  	"unicode"
    22  
    23  	"github.com/blang/semver"
    24  	"github.com/golang/glog"
    25  )
    26  
    27  func Parse(gitversion string) (semver.Version, error) {
    28  	// optionally trim leading spaces then one v
    29  	var seen bool
    30  	gitversion = strings.TrimLeftFunc(gitversion, func(ch rune) bool {
    31  		if seen {
    32  			return false
    33  		}
    34  		if ch == 'v' {
    35  			seen = true
    36  			return true
    37  		}
    38  		return unicode.IsSpace(ch)
    39  	})
    40  
    41  	return semver.Make(gitversion)
    42  }
    43  
    44  func MustParse(gitversion string) semver.Version {
    45  	v, err := Parse(gitversion)
    46  	if err != nil {
    47  		glog.Fatalf("failed to parse semver from gitversion %q: %v", gitversion, err)
    48  	}
    49  	return v
    50  }