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|
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.Slice:
typ := reflect.TypeOf(f.Interface()).Elem()
slice := reflect.MakeSlice(reflect.SliceOf(typ), f.Len(), f.Cap())
switch typ.Kind() {
case reflect.String:
s, ok := slice.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)
// I dont know if this code is needed anymore, TBD
// for k, v := range filters {
// lowerCaseKeys[strings.ToLower(k)] = v
// }
s, err := json.MarshalToString(lowerCaseKeys)
if err != nil {
return nil, err
}
params.Set(fieldName, s)
default:
return nil, errors.Errorf("unknown type %s", f.Kind().String())
}
}
return params, nil
}
`
var fieldTmpl = `
// With{{.Name}}
func(o *{{.StructName}}) With{{.Name}}(value {{.Type}}) *{{.StructName}} {
v := &value
o.{{.Name}} = v
return o
}
`
type fieldStruct struct {
Name string
StructName string
Type string
}
func main() {
var (
closed bool
fieldStructs []fieldStruct
structNode ast.Node
)
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.ToLower(inputStructName) + "_" + srcFile)
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 {
structNode = n
x := ref.Type.(*ast.StructType)
for _, field := range x.Fields.List {
var (
name string
)
typeExpr := field.Type
start := typeExpr.Pos() - 1
end := typeExpr.End() - 1
fieldType := strings.Replace(string(b[start:end]), "*", "", 1)
if len(field.Names) > 0 {
name = field.Names[0].Name
if len(name) < 1 {
panic(errors.New("bad name"))
}
}
fStruct := fieldStruct{
Name: name,
StructName: inputStructName,
Type: fieldType,
}
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
})
}
|
