1package graphql
 2
 3import (
 4	"encoding/json"
 5	"fmt"
 6	"io"
 7	"strconv"
 8)
 9
10func MarshalID(s string) Marshaler {
11	return WriterFunc(func(w io.Writer) {
12		io.WriteString(w, strconv.Quote(s))
13	})
14}
15func UnmarshalID(v interface{}) (string, error) {
16	switch v := v.(type) {
17	case string:
18		return v, nil
19	case json.Number:
20		return string(v), nil
21	case int:
22		return strconv.Itoa(v), nil
23	case float64:
24		return fmt.Sprintf("%f", v), nil
25	case bool:
26		if v {
27			return "true", nil
28		} else {
29			return "false", nil
30		}
31	case nil:
32		return "null", nil
33	default:
34		return "", fmt.Errorf("%T is not a string", v)
35	}
36}