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package arg
import (
"encoding"
"fmt"
"reflect"
"strconv"
"time"
)
var (
durationType = reflect.TypeOf(time.Duration(0))
textUnmarshalerType = reflect.TypeOf([]encoding.TextUnmarshaler{}).Elem()
)
// set a value from a string
func setScalar(v reflect.Value, s string) error {
if !v.CanSet() {
return fmt.Errorf("field is not exported")
}
// If we have a time.Duration then use time.ParseDuration
if v.Type() == durationType {
x, err := time.ParseDuration(s)
if err != nil {
return err
}
v.Set(reflect.ValueOf(x))
return nil
}
switch v.Kind() {
case reflect.String:
v.SetString(s)
case reflect.Bool:
x, err := strconv.ParseBool(s)
if err != nil {
return err
}
v.SetBool(x)
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
x, err := strconv.ParseInt(s, 10, v.Type().Bits())
if err != nil {
return err
}
v.SetInt(x)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
x, err := strconv.ParseUint(s, 10, v.Type().Bits())
if err != nil {
return err
}
v.SetUint(x)
case reflect.Float32, reflect.Float64:
x, err := strconv.ParseFloat(s, v.Type().Bits())
if err != nil {
return err
}
v.SetFloat(x)
default:
return fmt.Errorf("not a scalar type: %s", v.Kind())
}
return nil
}
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