khenaidoo | ab1f7bd | 2019-11-14 14:00:27 -0500 | [diff] [blame] | 1 | // Copyright 2013-2015 CoreOS, Inc. |
| 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 | // Semantic Versions http://semver.org |
| 16 | package semver |
| 17 | |
| 18 | import ( |
| 19 | "bytes" |
| 20 | "errors" |
| 21 | "fmt" |
| 22 | "strconv" |
| 23 | "strings" |
| 24 | ) |
| 25 | |
| 26 | type Version struct { |
| 27 | Major int64 |
| 28 | Minor int64 |
| 29 | Patch int64 |
| 30 | PreRelease PreRelease |
| 31 | Metadata string |
| 32 | } |
| 33 | |
| 34 | type PreRelease string |
| 35 | |
| 36 | func splitOff(input *string, delim string) (val string) { |
| 37 | parts := strings.SplitN(*input, delim, 2) |
| 38 | |
| 39 | if len(parts) == 2 { |
| 40 | *input = parts[0] |
| 41 | val = parts[1] |
| 42 | } |
| 43 | |
| 44 | return val |
| 45 | } |
| 46 | |
| 47 | func New(version string) *Version { |
| 48 | return Must(NewVersion(version)) |
| 49 | } |
| 50 | |
| 51 | func NewVersion(version string) (*Version, error) { |
| 52 | v := Version{} |
| 53 | |
| 54 | if err := v.Set(version); err != nil { |
| 55 | return nil, err |
| 56 | } |
| 57 | |
| 58 | return &v, nil |
| 59 | } |
| 60 | |
| 61 | // Must is a helper for wrapping NewVersion and will panic if err is not nil. |
| 62 | func Must(v *Version, err error) *Version { |
| 63 | if err != nil { |
| 64 | panic(err) |
| 65 | } |
| 66 | return v |
| 67 | } |
| 68 | |
| 69 | // Set parses and updates v from the given version string. Implements flag.Value |
| 70 | func (v *Version) Set(version string) error { |
| 71 | metadata := splitOff(&version, "+") |
| 72 | preRelease := PreRelease(splitOff(&version, "-")) |
| 73 | dotParts := strings.SplitN(version, ".", 3) |
| 74 | |
| 75 | if len(dotParts) != 3 { |
| 76 | return fmt.Errorf("%s is not in dotted-tri format", version) |
| 77 | } |
| 78 | |
| 79 | parsed := make([]int64, 3, 3) |
| 80 | |
| 81 | for i, v := range dotParts[:3] { |
| 82 | val, err := strconv.ParseInt(v, 10, 64) |
| 83 | parsed[i] = val |
| 84 | if err != nil { |
| 85 | return err |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | v.Metadata = metadata |
| 90 | v.PreRelease = preRelease |
| 91 | v.Major = parsed[0] |
| 92 | v.Minor = parsed[1] |
| 93 | v.Patch = parsed[2] |
| 94 | return nil |
| 95 | } |
| 96 | |
| 97 | func (v Version) String() string { |
| 98 | var buffer bytes.Buffer |
| 99 | |
| 100 | fmt.Fprintf(&buffer, "%d.%d.%d", v.Major, v.Minor, v.Patch) |
| 101 | |
| 102 | if v.PreRelease != "" { |
| 103 | fmt.Fprintf(&buffer, "-%s", v.PreRelease) |
| 104 | } |
| 105 | |
| 106 | if v.Metadata != "" { |
| 107 | fmt.Fprintf(&buffer, "+%s", v.Metadata) |
| 108 | } |
| 109 | |
| 110 | return buffer.String() |
| 111 | } |
| 112 | |
| 113 | func (v *Version) UnmarshalYAML(unmarshal func(interface{}) error) error { |
| 114 | var data string |
| 115 | if err := unmarshal(&data); err != nil { |
| 116 | return err |
| 117 | } |
| 118 | return v.Set(data) |
| 119 | } |
| 120 | |
| 121 | func (v Version) MarshalJSON() ([]byte, error) { |
| 122 | return []byte(`"` + v.String() + `"`), nil |
| 123 | } |
| 124 | |
| 125 | func (v *Version) UnmarshalJSON(data []byte) error { |
| 126 | l := len(data) |
| 127 | if l == 0 || string(data) == `""` { |
| 128 | return nil |
| 129 | } |
| 130 | if l < 2 || data[0] != '"' || data[l-1] != '"' { |
| 131 | return errors.New("invalid semver string") |
| 132 | } |
| 133 | return v.Set(string(data[1 : l-1])) |
| 134 | } |
| 135 | |
| 136 | // Compare tests if v is less than, equal to, or greater than versionB, |
| 137 | // returning -1, 0, or +1 respectively. |
| 138 | func (v Version) Compare(versionB Version) int { |
| 139 | if cmp := recursiveCompare(v.Slice(), versionB.Slice()); cmp != 0 { |
| 140 | return cmp |
| 141 | } |
| 142 | return preReleaseCompare(v, versionB) |
| 143 | } |
| 144 | |
| 145 | // Equal tests if v is equal to versionB. |
| 146 | func (v Version) Equal(versionB Version) bool { |
| 147 | return v.Compare(versionB) == 0 |
| 148 | } |
| 149 | |
| 150 | // LessThan tests if v is less than versionB. |
| 151 | func (v Version) LessThan(versionB Version) bool { |
| 152 | return v.Compare(versionB) < 0 |
| 153 | } |
| 154 | |
| 155 | // Slice converts the comparable parts of the semver into a slice of integers. |
| 156 | func (v Version) Slice() []int64 { |
| 157 | return []int64{v.Major, v.Minor, v.Patch} |
| 158 | } |
| 159 | |
| 160 | func (p PreRelease) Slice() []string { |
| 161 | preRelease := string(p) |
| 162 | return strings.Split(preRelease, ".") |
| 163 | } |
| 164 | |
| 165 | func preReleaseCompare(versionA Version, versionB Version) int { |
| 166 | a := versionA.PreRelease |
| 167 | b := versionB.PreRelease |
| 168 | |
| 169 | /* Handle the case where if two versions are otherwise equal it is the |
| 170 | * one without a PreRelease that is greater */ |
| 171 | if len(a) == 0 && (len(b) > 0) { |
| 172 | return 1 |
| 173 | } else if len(b) == 0 && (len(a) > 0) { |
| 174 | return -1 |
| 175 | } |
| 176 | |
| 177 | // If there is a prerelease, check and compare each part. |
| 178 | return recursivePreReleaseCompare(a.Slice(), b.Slice()) |
| 179 | } |
| 180 | |
| 181 | func recursiveCompare(versionA []int64, versionB []int64) int { |
| 182 | if len(versionA) == 0 { |
| 183 | return 0 |
| 184 | } |
| 185 | |
| 186 | a := versionA[0] |
| 187 | b := versionB[0] |
| 188 | |
| 189 | if a > b { |
| 190 | return 1 |
| 191 | } else if a < b { |
| 192 | return -1 |
| 193 | } |
| 194 | |
| 195 | return recursiveCompare(versionA[1:], versionB[1:]) |
| 196 | } |
| 197 | |
| 198 | func recursivePreReleaseCompare(versionA []string, versionB []string) int { |
| 199 | // A larger set of pre-release fields has a higher precedence than a smaller set, |
| 200 | // if all of the preceding identifiers are equal. |
| 201 | if len(versionA) == 0 { |
| 202 | if len(versionB) > 0 { |
| 203 | return -1 |
| 204 | } |
| 205 | return 0 |
| 206 | } else if len(versionB) == 0 { |
| 207 | // We're longer than versionB so return 1. |
| 208 | return 1 |
| 209 | } |
| 210 | |
| 211 | a := versionA[0] |
| 212 | b := versionB[0] |
| 213 | |
| 214 | aInt := false |
| 215 | bInt := false |
| 216 | |
| 217 | aI, err := strconv.Atoi(versionA[0]) |
| 218 | if err == nil { |
| 219 | aInt = true |
| 220 | } |
| 221 | |
| 222 | bI, err := strconv.Atoi(versionB[0]) |
| 223 | if err == nil { |
| 224 | bInt = true |
| 225 | } |
| 226 | |
| 227 | // Handle Integer Comparison |
| 228 | if aInt && bInt { |
| 229 | if aI > bI { |
| 230 | return 1 |
| 231 | } else if aI < bI { |
| 232 | return -1 |
| 233 | } |
| 234 | } |
| 235 | |
| 236 | // Handle String Comparison |
| 237 | if a > b { |
| 238 | return 1 |
| 239 | } else if a < b { |
| 240 | return -1 |
| 241 | } |
| 242 | |
| 243 | return recursivePreReleaseCompare(versionA[1:], versionB[1:]) |
| 244 | } |
| 245 | |
| 246 | // BumpMajor increments the Major field by 1 and resets all other fields to their default values |
| 247 | func (v *Version) BumpMajor() { |
| 248 | v.Major += 1 |
| 249 | v.Minor = 0 |
| 250 | v.Patch = 0 |
| 251 | v.PreRelease = PreRelease("") |
| 252 | v.Metadata = "" |
| 253 | } |
| 254 | |
| 255 | // BumpMinor increments the Minor field by 1 and resets all other fields to their default values |
| 256 | func (v *Version) BumpMinor() { |
| 257 | v.Minor += 1 |
| 258 | v.Patch = 0 |
| 259 | v.PreRelease = PreRelease("") |
| 260 | v.Metadata = "" |
| 261 | } |
| 262 | |
| 263 | // BumpPatch increments the Patch field by 1 and resets all other fields to their default values |
| 264 | func (v *Version) BumpPatch() { |
| 265 | v.Patch += 1 |
| 266 | v.PreRelease = PreRelease("") |
| 267 | v.Metadata = "" |
| 268 | } |