-
Notifications
You must be signed in to change notification settings - Fork 583
/
reflectutil.go
63 lines (56 loc) · 1.59 KB
/
reflectutil.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package reflectutil
import (
"fmt"
"reflect"
)
func UnknownNonEmptyFields(structOrStructPtr interface{}, knownNames ...string) []string {
var unknown []string
knownNamesMap := make(map[string]struct{}, len(knownNames))
for _, name := range knownNames {
knownNamesMap[name] = struct{}{}
}
origVal := reflect.ValueOf(structOrStructPtr)
var val reflect.Value
switch kind := origVal.Kind(); kind {
case reflect.Ptr:
val = origVal.Elem()
case reflect.Struct:
val = origVal
default:
panic(fmt.Errorf("expected Ptr or Struct, got %+v", kind))
}
for i := 0; i < val.NumField(); i++ {
iField := val.Field(i)
if isEmpty(iField) {
continue
}
iName := val.Type().Field(i).Name
if _, ok := knownNamesMap[iName]; !ok {
unknown = append(unknown, iName)
}
}
return unknown
}
func isEmpty(v reflect.Value) bool {
// NOTE: IsZero returns false for zero-length map and slice
if v.IsZero() {
return true
}
switch v.Kind() {
case reflect.Map, reflect.Slice:
return v.Len() == 0
}
return false
}