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
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
|
package main
import (
"errors"
"fmt"
"go/ast"
"go/parser"
"go/token"
"io/ioutil"
"os"
"os/exec"
"strings"
"text/template"
"time"
)
var bodyTmpl = `package {{.PackageName}}
import (
{{range $import := .Imports}} {{$import}}
{{end}}
)
/*
This file is generated automatically by go generate. Do not edit.
Created {{.Date}}
*/
// Changed
func (o *{{.StructName}}) Changed(fieldName string) bool {
r := reflect.ValueOf(o)
value := reflect.Indirect(r).FieldByName(fieldName)
return !value.IsNil()
}
// ToParams
func (o *{{.StructName}}) ToParams() (url.Values, error) {
params := url.Values{}
if o == nil {
return params, nil
}
json := jsoniter.ConfigCompatibleWithStandardLibrary
s := reflect.ValueOf(o)
if reflect.Ptr == s.Kind() {
s = s.Elem()
}
sType := s.Type()
for i := 0; i < s.NumField(); i++ {
fieldName := sType.Field(i).Name
if !o.Changed(fieldName) {
continue
}
f := s.Field(i)
if reflect.Ptr == f.Kind() {
f = f.Elem()
}
switch f.Kind() {
case reflect.Bool:
params.Set(fieldName, strconv.FormatBool(f.Bool()))
case reflect.String:
params.Set(fieldName, f.String())
case reflect.Int, reflect.Int64:
// f.Int() is always an int64
params.Set(fieldName, strconv.FormatInt(f.Int(), 10))
case reflect.Uint, reflect.Uint64:
// f.Uint() is always an uint64
params.Set(fieldName, strconv.FormatUint(f.Uint(), 10))
case reflect.Slice:
typ := reflect.TypeOf(f.Interface()).Elem()
switch typ.Kind() {
case reflect.String:
sl := f.Slice(0, f.Len())
s, ok := sl.Interface().([]string)
if !ok {
return nil, errors.New("failed to convert to string slice")
}
for _, val := range s {
params.Add(fieldName, val)
}
default:
return nil, errors.Errorf("unknown slice type %s", f.Kind().String())
}
case reflect.Map:
lowerCaseKeys := make(map[string][]string)
iter := f.MapRange()
for iter.Next() {
lowerCaseKeys[iter.Key().Interface().(string)] = iter.Value().Interface().([]string)
}
s, err := json.MarshalToString(lowerCaseKeys)
if err != nil {
return nil, err
}
params.Set(fieldName, s)
}
}
return params, nil
}
`
var fieldTmpl = `
// With{{.Name}}
func(o *{{.StructName}}) With{{.Name}}(value {{.Type}}) *{{.StructName}} {
v := {{.TypedValue}}
o.{{.Name}} = v
return o
}
// Get{{.Name}}
func(o *{{.StructName}}) Get{{.Name}}() {{.Type}} {
var {{.ZeroName}} {{.Type}}
if o.{{.Name}} == nil {
return {{.ZeroName}}
}
return {{.TypedName}}
}
`
type fieldStruct struct {
Name string
StructName string
Type string
TypedName string
TypedValue string
ZeroName string
}
func main() {
var (
closed bool
fieldStructs []fieldStruct
)
srcFile := os.Getenv("GOFILE")
pkg := os.Getenv("GOPACKAGE")
inputStructName := os.Args[1]
b, err := ioutil.ReadFile(srcFile)
if err != nil {
panic(err)
}
fset := token.NewFileSet() // positions are relative to fset
f, err := parser.ParseFile(fset, "", b, parser.ParseComments)
if err != nil {
panic(err)
}
// always add reflect
imports := []string{"\"reflect\""}
for _, imp := range f.Imports {
imports = append(imports, imp.Path.Value)
}
out, err := os.Create(strings.TrimRight(srcFile, ".go") + "_" + strings.Replace(strings.ToLower(inputStructName), "options", "_options", 1) + ".go")
if err != nil {
panic(err)
}
defer func() {
if !closed {
out.Close()
}
}()
bodyStruct := struct {
PackageName string
Imports []string
Date string
StructName string
}{
PackageName: pkg,
Imports: imports,
Date: time.Now().String(),
StructName: inputStructName,
}
body := template.Must(template.New("body").Parse(bodyTmpl))
fields := template.Must(template.New("fields").Parse(fieldTmpl))
ast.Inspect(f, func(n ast.Node) bool {
ref, refOK := n.(*ast.TypeSpec)
if refOK {
if ref.Name.Name == inputStructName {
x := ref.Type.(*ast.StructType)
for _, field := range x.Fields.List {
var (
name, zeroName, typedName, typedValue string
)
if len(field.Names) > 0 {
name = field.Names[0].Name
if len(name) < 1 {
panic(errors.New("bad name"))
}
}
for k, v := range name {
zeroName = strings.ToLower(string(v)) + name[k+1:]
break
}
//sub := "*"
typeExpr := field.Type
switch field.Type.(type) {
case *ast.MapType, *ast.StructType, *ast.ArrayType:
typedName = "o." + name
typedValue = "value"
default:
typedName = "*o." + name
typedValue = "&value"
}
start := typeExpr.Pos() - 1
end := typeExpr.End() - 1
fieldType := strings.Replace(string(b[start:end]), "*", "", 1)
fStruct := fieldStruct{
Name: name,
StructName: inputStructName,
Type: fieldType,
TypedName: typedName,
TypedValue: typedValue,
ZeroName: zeroName,
}
fieldStructs = append(fieldStructs, fStruct)
} // for
// create the body
if err := body.Execute(out, bodyStruct); err != nil {
fmt.Println(err)
os.Exit(1)
}
// create with func from the struct fields
for _, fs := range fieldStructs {
if err := fields.Execute(out, fs); err != nil {
fmt.Println(err)
os.Exit(1)
}
}
// close out file
if err := out.Close(); err != nil {
fmt.Println(err)
os.Exit(1)
}
closed = true
// go fmt file
gofmt := exec.Command("gofmt", "-w", "-s", out.Name())
gofmt.Stderr = os.Stdout
if err := gofmt.Run(); err != nil {
fmt.Println(err)
os.Exit(1)
}
// go import file
goimport := exec.Command("goimports", "-w", out.Name())
goimport.Stderr = os.Stdout
if err := goimport.Run(); err != nil {
fmt.Println(err)
os.Exit(1)
}
}
}
return true
})
}
|
