micro/config/reflect.go
Vasiliy Tolstov b50855855b config: export method to init new empty struct
Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>
2020-12-20 00:15:29 +03:00

47 lines
969 B
Go

package config
import (
"reflect"
)
func IsEmpty(v reflect.Value) bool {
switch v.Kind() {
case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
return v.Len() == 0
case reflect.Bool:
return !v.Bool()
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return v.Int() == 0
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return v.Uint() == 0
case reflect.Float32, reflect.Float64:
return v.Float() == 0
case reflect.Interface, reflect.Ptr:
if v.IsNil() {
return true
}
return IsEmpty(v.Elem())
case reflect.Func:
return v.IsNil()
case reflect.Invalid:
return true
}
return false
}
func Zero(src interface{}) (interface{}, error) {
sv := reflect.ValueOf(src)
if sv.Kind() == reflect.Ptr {
sv = sv.Elem()
}
if sv.Kind() == reflect.Invalid {
return nil, ErrInvalidStruct
}
dst := reflect.New(sv.Type())
return dst.Interface(), nil
}