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semver.go
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semver.go
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package types
import (
"encoding/json"
"github.com/coreos/go-semver/semver"
)
var (
ErrNoZeroSemVer = ACVersionError("SemVer cannot be zero")
ErrBadSemVer = ACVersionError("SemVer is bad")
)
// SemVer implements the Unmarshaler interface to define a field that must be
// a semantic version string
// TODO(jonboulle): extend upstream instead of wrapping?
type SemVer semver.Version
// NewSemVer generates a new SemVer from a string. If the given string does
// not represent a valid SemVer, nil and an error are returned.
func NewSemVer(s string) (*SemVer, error) {
nsv, err := semver.NewVersion(s)
if err != nil {
return nil, ErrBadSemVer
}
v := SemVer(*nsv)
if v.Empty() {
return nil, ErrNoZeroSemVer
}
return &v, nil
}
func (sv SemVer) String() string {
s := semver.Version(sv)
return s.String()
}
func (sv SemVer) Empty() bool {
return semver.Version(sv) == semver.Version{}
}
// UnmarshalJSON implements the json.Unmarshaler interface
func (sv *SemVer) UnmarshalJSON(data []byte) error {
var s string
if err := json.Unmarshal(data, &s); err != nil {
return err
}
v, err := NewSemVer(s)
if err != nil {
return err
}
*sv = *v
return nil
}
// MarshalJSON implements the json.Marshaler interface
func (sv SemVer) MarshalJSON() ([]byte, error) {
if sv.Empty() {
return nil, ErrNoZeroSemVer
}
return json.Marshal(sv.String())
}