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master
fs/tristate.go
80 строк
1 KB
Nick Craig-Wood
fs: fix tristate conversion to JSON
27 мар 2023, 18:17
27 мар 2023, 18:17
5f4d715
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package fs import ( "encoding/json" "fmt" "strconv" "strings" ) // Tristate is a boolean that can has the states, true, false and // unset/invalid/nil type Tristate struct { Value bool Valid bool } // String renders the tristate as true/false/unset func (t Tristate) String() string { if !t.Valid { return "unset" } if t.Value { return "true" } return "false" } // Set the List entries func (t *Tristate) Set(s string) error { s = strings.ToLower(s) if s == "" || s == "nil" || s == "null" || s == "unset" { t.Valid = false return nil } value, err := strconv.ParseBool(s) if err != nil { return fmt.Errorf("failed to parse Tristate %q: %w", s, err) } t.Value = value t.Valid = true return nil } // Type of the value func (Tristate) Type() string { return "Tristate" } // Scan implements the fmt.Scanner interface func (t *Tristate) Scan(s fmt.ScanState, ch rune) error { token, err := s.Token(true, nil) if err != nil { return err } return t.Set(string(token)) } // UnmarshalJSON parses it as a bool or nil for unset func (t *Tristate) UnmarshalJSON(in []byte) error { var b *bool err := json.Unmarshal(in, &b) if err != nil { return err } if b != nil { t.Valid = true t.Value = *b } else { t.Valid = false } return nil } // MarshalJSON encodes it as a bool or nil for unset func (t *Tristate) MarshalJSON() ([]byte, error) { if !t.Valid { return json.Marshal(nil) } return json.Marshal(t.Value) }