-
Notifications
You must be signed in to change notification settings - Fork 0
/
util.go
126 lines (112 loc) · 2.39 KB
/
util.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
package orm
import (
"reflect"
"github.com/nibeh/pg/v9/types"
)
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 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)
}
func typeByIndex(t reflect.Type, index []int) reflect.Type {
for _, x := range index {
switch t.Kind() {
case reflect.Ptr:
t = t.Elem()
case reflect.Slice:
t = indirectType(t.Elem())
}
t = t.Field(x).Type
}
return indirectType(t)
}
func fieldByIndex(v reflect.Value, index []int) reflect.Value {
for i, idx := range index {
if i > 0 {
v = indirectNew(v)
}
v = v.Field(idx)
}
return v
}
func indirectNew(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 walk(v reflect.Value, index []int, fn func(reflect.Value)) {
v = reflect.Indirect(v)
switch v.Kind() {
case reflect.Slice:
for i := 0; i < v.Len(); i++ {
visitField(v.Index(i), index, fn)
}
default:
visitField(v, index, fn)
}
}
func visitField(v reflect.Value, index []int, fn func(reflect.Value)) {
v = reflect.Indirect(v)
if len(index) > 0 {
v = v.Field(index[0])
if v.Kind() == reflect.Ptr && v.IsNil() {
return
}
walk(v, index[1:], fn)
} else {
fn(v)
}
}
func dstValues(model TableModel, fields []*Field) map[string][]reflect.Value {
mp := make(map[string][]reflect.Value)
var id []byte
walk(model.Root(), model.ParentIndex(), func(v reflect.Value) {
id = modelID(id[:0], v, fields)
mp[string(id)] = append(mp[string(id)], v.FieldByIndex(model.Relation().Field.Index))
})
return mp
}
func modelID(b []byte, v reflect.Value, fields []*Field) []byte {
for i, f := range fields {
if i > 0 {
b = append(b, ',')
}
b = f.AppendValue(b, v, 0)
}
return b
}
func appendColumns(b []byte, table types.Safe, fields []*Field) []byte {
for i, f := range fields {
if i > 0 {
b = append(b, ", "...)
}
if len(table) > 0 {
b = append(b, table...)
b = append(b, '.')
}
b = append(b, f.Column...)
}
return b
}