1package graphql
 2
 3import (
 4	"fmt"
 5	"io"
 6	"strings"
 7)
 8
 9func MarshalBoolean(b bool) Marshaler {
10	return WriterFunc(func(w io.Writer) {
11		if b {
12			w.Write(trueLit)
13		} else {
14			w.Write(falseLit)
15		}
16	})
17}
18
19func UnmarshalBoolean(v interface{}) (bool, error) {
20	switch v := v.(type) {
21	case string:
22		return "true" == strings.ToLower(v), nil
23	case int:
24		return v != 0, nil
25	case bool:
26		return v, nil
27	default:
28		return false, fmt.Errorf("%T is not a bool", v)
29	}
30}