package chschema import ( "reflect" ) func indirect(v reflect.Value) reflect.Value { switch v.Kind() { case reflect.Interface: return indirect(v.Elem()) case reflect.Ptr: return v.Elem() default: return v } } func indirectType(t reflect.Type) reflect.Type { if t.Kind() == reflect.Ptr { t = t.Elem() } return t } func fieldByIndex(v reflect.Value, index []int) (_ reflect.Value, ok bool) { if len(index) == 1 { return v.Field(index[0]), true } for i, idx := range index { if i > 0 { if v.Kind() == reflect.Ptr { if v.IsNil() { return v, false } v = v.Elem() } } v = v.Field(idx) } return v, true } func fieldByIndexAlloc(v reflect.Value, index []int) reflect.Value { if len(index) == 1 { return v.Field(index[0]) } for i, idx := range index { if i > 0 { v = indirectNil(v) } v = v.Field(idx) } return v } func indirectNil(v reflect.Value) reflect.Value { if v.Kind() == reflect.Ptr { if v.IsNil() { v.Set(reflect.New(v.Type().Elem())) } v = v.Elem() } return v } func sliceElemType(v reflect.Value) reflect.Type { elemType := v.Type().Elem() if elemType.Kind() == reflect.Interface && v.Len() > 0 { return indirect(v.Index(0).Elem()).Type() } return indirectType(elemType) }