github.com/boki/go-xmp@v1.0.1/xmp/semver.go (about)

     1  // Copyright (c) 2017-2018 Alexander Eichhorn
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License"): you may
     4  // not use this file except in compliance with the License. You may obtain
     5  // 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, WITHOUT
    11  // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
    12  // License for the specific language governing permissions and limitations
    13  // under the License.
    14  
    15  package xmp
    16  
    17  import (
    18  	"fmt"
    19  	"strconv"
    20  	"strings"
    21  )
    22  
    23  type Version struct {
    24  	Major int
    25  	Minor int
    26  	Patch int
    27  }
    28  
    29  func ParseVersion(s string) (Version, error) {
    30  	var v Version
    31  	tokens := strings.Split(s, ".")
    32  	switch len(tokens) {
    33  	case 3:
    34  		i, err := strconv.Atoi(tokens[2])
    35  		if err != nil {
    36  			return v, fmt.Errorf("semver: illegal version string '%s': %v", s, err)
    37  		}
    38  		v.Patch = i
    39  		fallthrough
    40  	case 2:
    41  		i, err := strconv.Atoi(tokens[1])
    42  		if err != nil {
    43  			return v, fmt.Errorf("semver: illegal version string '%s': %v", s, err)
    44  		}
    45  		v.Minor = i
    46  		fallthrough
    47  	case 1:
    48  		i, err := strconv.Atoi(tokens[0])
    49  		if err != nil {
    50  			return v, fmt.Errorf("semver: illegal version string '%s': %v", s, err)
    51  		}
    52  		v.Major = i
    53  	default:
    54  		return v, fmt.Errorf("semver: illegal version string '%s'", s)
    55  	}
    56  	return v, nil
    57  }
    58  
    59  func (v Version) String() string {
    60  	return fmt.Sprintf("%d.%d.%d", v.Major, v.Minor, v.Patch)
    61  }
    62  
    63  func (v Version) IsZero() bool {
    64  	return v.Major+v.Minor+v.Patch == 0
    65  }
    66  
    67  func (v Version) Between(a, b Version) bool {
    68  	switch {
    69  	case v.IsZero():
    70  		return true
    71  	case a.IsZero():
    72  		return v.Before(b) || v.Equal(a)
    73  	case b.IsZero():
    74  		return v.After(a) || v.Equal(a)
    75  	default:
    76  		return v.Equal(a) || v.Equal(b) || (v.After(a) && v.Before(b))
    77  	}
    78  }
    79  
    80  func (v Version) Equal(a Version) bool {
    81  	return v.Major == a.Major && v.Minor == a.Minor && v.Patch == a.Patch
    82  }
    83  
    84  func (v Version) Before(a Version) bool {
    85  	return (v.Major < a.Major) ||
    86  		(v.Major == a.Major && v.Minor < a.Minor) ||
    87  		(v.Major == a.Major && v.Minor == a.Minor && v.Patch < a.Patch)
    88  }
    89  
    90  func (v Version) After(a Version) bool {
    91  	return (v.Major > a.Major) ||
    92  		(v.Major == a.Major && v.Minor > a.Minor) ||
    93  		(v.Major == a.Major && v.Minor == a.Minor && v.Patch > a.Patch)
    94  }