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