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version_utils.go
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version_utils.go
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/*
* @license
* Copyright 2023 Dynatrace LLC
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package version
import (
"fmt"
"strconv"
"strings"
)
// UnknownVersion is just a version that is not set
var UnknownVersion = Version{}
// Version represents a software version composed of
type Version struct {
Major int
Minor int
Patch int
}
// String returns the version in a printable format, e.g.: 1.2.3
func (v Version) String() string {
return fmt.Sprintf("%d.%d.%d", v.Major, v.Minor, v.Patch)
}
// GreaterThan determines whether this version is greater than the other version
func (v Version) GreaterThan(other Version) bool {
if v == other {
return false
}
if v.Major < other.Major {
return false
}
if v.Major == other.Major &&
v.Minor < other.Minor {
return false
}
if v.Major == other.Major &&
v.Minor == other.Minor &&
v.Patch < other.Patch {
return false
}
return true
}
// SmallerThan determines whether this version is smaller than the given version
func (v Version) SmallerThan(other Version) bool {
return other.GreaterThan(v)
}
// Invalid returns whether this version is valid or not.
// A version is considered to be "invalid" if it is equal to "0.0.0" or
// contains a negative number, e.e. "0.-1.2"
func (v Version) Invalid() bool {
return (v.Major <= 0 && v.Minor <= 0 && v.Patch <= 0) ||
v.Major < 0 || v.Minor < 0 || v.Patch < 0
}
// ParseVersion takes a version as string and tries to parse it to convert it to a
// Version value. It returns the Version value and possibly an error if the string could not be parsed
// according to the expected format: "MAJOR.MINOR.PATCH" or "MAJOR.MINOR" each component being a non-negative number
func ParseVersion(versionString string) (Version, error) {
split := strings.Split(versionString, ".")
if !(len(split) == 2 || len(split) == 3) {
return Version{}, fmt.Errorf("failed to parse version: format did not meet expected MAJOR.MINOR or MAJOR.MINOR.PATCH pattern: %v", versionString)
}
majorVersion, err := strconv.Atoi(split[0])
if err != nil {
return Version{}, fmt.Errorf("failed to parse version: major %v is not a number", split[0])
}
minorVersion, err := strconv.Atoi(split[1])
if err != nil {
return Version{}, fmt.Errorf("failed to parse version: minor %v is not a number", split[1])
}
patchVersion := 0
if len(split) == 3 {
patchVersion, err = strconv.Atoi(split[2])
if err != nil {
return Version{}, fmt.Errorf("failed to parse version: patch %v is not a number", split[2])
}
}
return Version{
Major: majorVersion,
Minor: minorVersion,
Patch: patchVersion,
}, nil
}