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enum.go
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enum.go
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package sdktypes
import (
"encoding/json"
"strings"
"go.autokitteh.dev/autokitteh/sdk/sdkerrors"
)
type enumTraits interface {
Prefix() string
Names() map[int32]string
Values() map[string]int32
}
func AllEnumNames[T enumTraits]() (values []string) {
var t T
for _, s := range t.Names() {
values = append(values, strings.TrimPrefix(s, t.Prefix()))
}
return
}
type enum[T enumTraits, E ~int32] struct{ v E }
func (e enum[T, E]) IsZero() bool { return e.v == 0 }
func (e enum[T, E]) String() string {
var t T
return strings.TrimPrefix(t.Names()[int32(e.v)], t.Prefix())
}
func (e enum[T, E]) Prefix() string { var t T; return t.Prefix() }
func (e enum[T, E]) ToProto() E { return e.v }
func (e enum[T, E]) Strict() error {
if e.v == 0 {
return sdkerrors.NewInvalidArgumentError("unspecified")
}
return nil
}
func (e enum[T, E]) MarshalJSON() ([]byte, error) {
return []byte(`"` + e.String() + `"`), nil
}
func (e *enum[T, E]) UnmarshalJSON(b []byte) (err error) {
var s string
if err = json.Unmarshal(b, &s); err != nil {
return
}
*e, err = parseEnum[T, E](s)
return
}
func parseEnum[T enumTraits, E ~int32](raw string) (e enum[T, E], err error) {
if raw == "" {
return enum[T, E]{}, nil
}
var t T
upper := strings.ToUpper(raw)
if !strings.HasPrefix(upper, t.Prefix()) {
upper = t.Prefix() + upper
}
state, ok := t.Values()[upper]
if !ok {
err = sdkerrors.NewInvalidArgumentError("unknown state %v", raw)
return
}
e = enum[T, E]{E(state)}
return
}
func ParseEnum[W ~struct{ enum[T, E] }, T enumTraits, E ~int32](raw string) (w W, err error) {
var e enum[T, E]
if e, err = parseEnum[T, E](raw); err != nil {
return
}
w = W{e}
return
}
func EnumFromProto[W ~struct{ enum[T, E] }, T enumTraits, E ~int32](e E) (w W, err error) {
var t T
if _, ok := t.Names()[int32(e)]; ok {
w = W{enum[T, E]{e}}
return
}
err = sdkerrors.NewInvalidArgumentError("value")
return
}
func forceEnumFromProto[W ~struct{ enum[T, E] }, T enumTraits, E ~int32](e E) W {
return W{enum[T, E]{e}}
}