62 lines
873 B
Go
62 lines
873 B
Go
package version
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import (
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"errors"
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"strconv"
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"strings"
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)
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type version struct {
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major int
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minor int
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}
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func Compare(a string, b string) (int, error) {
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first, err := parse(a)
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if err != nil {
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return 0, err
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}
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second, err := parse(b)
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if err != nil {
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return 0, err
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}
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if first.major < second.major {
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return -1, nil
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}
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if first.major > second.major {
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return 1, nil
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}
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if first.minor < second.minor {
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return -1, nil
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}
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if first.minor > second.minor {
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return 1, nil
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}
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return 0, nil
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}
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func parse(v string) (version, error) {
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i := strings.Index(v, ".")
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if i == -1 {
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return version{}, errors.New("version must contain major and minor parts")
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}
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major, err := strconv.Atoi(v[:i])
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if err != nil {
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return version{}, err
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}
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minor, err := strconv.Atoi(v[i+1:])
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if err != nil {
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return version{}, err
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}
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return version{major, minor}, nil
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}
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