-
Notifications
You must be signed in to change notification settings - Fork 1
/
reflect.go
175 lines (160 loc) · 4.03 KB
/
reflect.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
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
package modelutils
import (
"errors"
"reflect"
"strings"
)
func GetFieldNames(m any) []string {
var v = reflect.ValueOf(m)
if !v.IsValid() {
return nil
}
var t = v.Type()
if t.Kind() == reflect.Ptr {
t = t.Elem()
}
if t.Kind() != reflect.Struct {
return nil
}
var names = make([]string, 0, t.NumField())
for i := 0; i < t.NumField(); i++ {
var field = t.Field(i)
if field.IsExported() {
names = append(names, field.Name)
}
}
return names
}
func GetField(m any, field string, strict bool) (any, error) {
// fmt.Printf("GetField: %v, %v %T\n", m, field, m)
var v = DePtr(reflect.ValueOf(m))
if !v.IsValid() {
// fmt.Println("GetField: ", v.Kind(), v.Type(), v.IsValid())
return nil, errors.New("invalid value")
}
if strict {
var field = v.FieldByName(field)
if field.IsValid() && field.CanInterface() {
return field.Interface(), nil
}
return nil, errors.New("field not found")
}
// fmt.Println("GetField: ", v.Kind(), v.Type())
for i := 0; i < v.NumField(); i++ {
if v.Type().Field(i).Name == field && v.Type().Field(i).IsExported() {
return v.Field(i).Interface(), nil
}
if v.Type().Field(i).IsExported() &&
((strict && v.Type().Field(i).Name == field) ||
(!strict && strings.EqualFold(v.Type().Field(i).Name, field))) {
var f = v.Field(i)
if f.Kind() == reflect.Ptr {
f = f.Elem()
}
if !f.IsValid() || !f.CanInterface() {
return nil, errors.New("field not found")
}
return f.Interface(), nil
}
var f = v.Field(i)
f = DePtr(f)
if f.Kind() == reflect.Struct {
if !f.IsValid() || !f.CanInterface() {
continue
}
var v, err = GetField(f.Interface(), field, false)
if err == nil {
return v, nil
}
}
}
return nil, errors.New("field not found")
}
func SetField(m any, field string, value any) error {
var v = reflect.ValueOf(m)
if v.Kind() == reflect.Ptr {
v = v.Elem()
}
for i := 0; i < v.NumField(); i++ {
if strings.EqualFold(v.Type().Field(i).Name, field) {
var f = v.Field(i)
if f.Kind() == reflect.Ptr {
f = f.Elem()
}
switch f.Kind() {
case reflect.String:
f.SetString(value.(string))
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
f.SetInt(value.(int64))
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
f.SetUint(value.(uint64))
case reflect.Float32, reflect.Float64:
f.SetFloat(value.(float64))
case reflect.Bool:
f.SetBool(value.(bool))
}
return nil
}
}
return errors.New("field not found")
}
// isPtr reports whether v represents a pointer.
// It returns false if v is the zero Value.
func isPtr(v reflect.Value) bool {
return v.Kind() == reflect.Ptr || v.Kind() == reflect.Pointer
}
// isVld reports whether v represents a value.
// It returns false if v is the zero Value.
func isVld(v reflect.Value) bool {
return v.IsValid()
}
// Convert a potential pointer to a value to a value
func DePtr(val any) reflect.Value {
switch val := val.(type) {
case reflect.Value:
if val.IsValid() && val.IsZero() {
var v = reflect.New(val.Type())
val = v.Elem()
}
if isPtr(val) && isVld(val) {
val = val.Elem()
}
if isPtr(val) && isVld(val) {
return DePtr(val)
}
return val
case reflect.Type:
return DePtr(reflect.New(val).Elem())
case reflect.StructField:
return DePtr(reflect.New(val.Type).Elem())
}
var v = reflect.ValueOf(val)
return DePtr(v)
}
func DePtrType(val any) reflect.Type {
switch v := val.(type) {
case reflect.Type:
if v.Kind() == reflect.Ptr || v.Kind() == reflect.Pointer {
v = v.Elem()
}
if v.Kind() == reflect.Ptr || v.Kind() == reflect.Pointer {
return DePtrType(v)
}
return v
case reflect.Value:
return DePtrType(v.Type())
case reflect.StructField:
return DePtrType(v.Type)
default:
return DePtrType(reflect.TypeOf(val))
}
}
// Get a pointer to a new value of the same type as val
func NewPtr(val any) reflect.Value {
var v = reflect.TypeOf(val)
v = DePtrType(v)
if v.Kind() == reflect.Ptr || v.Kind() == reflect.Pointer {
v = v.Elem()
}
return reflect.New(v)
}