blob: e9ef0322cf1feb2e8220ac30b9b61e50a178cfa6 (
plain)
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
64
|
package toml
import (
"reflect"
"strconv"
)
func ApplyDefaults(target any) {
targetValue := reflect.ValueOf(target)
if targetValue.Kind() != reflect.Pointer || targetValue.Elem().Kind() != reflect.Struct {
return
}
applyStructDefaults(targetValue.Elem())
}
func applyStructDefaults(structValue reflect.Value) {
structType := structValue.Type()
for fieldIndex := range structType.NumField() {
fieldValue := structValue.Field(fieldIndex)
fieldDescriptor := structType.Field(fieldIndex)
if !fieldValue.CanSet() {
continue
}
if fieldValue.Kind() == reflect.Struct {
applyStructDefaults(fieldValue)
continue
}
defaultValue := fieldDescriptor.Tag.Get("default")
if defaultValue == "" {
continue
}
setDefaultValue(fieldValue, defaultValue)
}
}
func setDefaultValue(field reflect.Value, defaultValue string) {
if !isZeroValue(field) {
return
}
switch field.Kind() {
case reflect.String:
field.SetString(defaultValue)
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
if parsed, parseError := strconv.ParseInt(defaultValue, 10, 64); parseError == nil {
field.SetInt(parsed)
}
case reflect.Bool:
if parsed, parseError := strconv.ParseBool(defaultValue); parseError == nil {
field.SetBool(parsed)
}
}
}
func isZeroValue(field reflect.Value) bool {
return field.IsZero()
}
|
