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struct2interface.go

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package struct2interface

import (

"fmt"

"go/ast"

"go/doc"

"go/parser"

"go/token"

"io/fs"

"log"

"os"

"path/filepath"

"strings"

"time"

"golang.org/x/tools/imports"

)

type makeInterfaceFile struct {

DirPath string

PkgName string

Structs []string

TypeDoc map[string]string

AllMethods map[string][]string

AllImports []string

}

type Method struct {

Code string

Docs []string

}

func (m *Method) Lines() []string {

var lines []string

lines = append(lines, m.Docs...)

lines = append(lines, m.Code)

return lines

}

func getReceiverTypeName(src []byte, fl interface{}) (string, *ast.FuncDecl) {

fd, ok := fl.(*ast.FuncDecl)

if !ok {

return "", nil

}

t, err := getReceiverType(fd)

if err != nil {

return "", nil

}

st := string(src[t.Pos()-1 : t.End()-1])

if len(st) > 0 && st[0] == '*' {

st = st[1:]

}

return st, fd

}

func getReceiverType(fd *ast.FuncDecl) (ast.Expr, error) {

if fd.Recv == nil {

return nil, fmt.Errorf("fd is not a method, it is a function")

}

return fd.Recv.List[0].Type, nil

}

func formatFieldList(src []byte, fl *ast.FieldList) []string {

if fl == nil {

return nil

}

var parts []string

for _, l := range fl.List {

names := make([]string, len(l.Names))

for i, n := range l.Names {

names[i] = n.Name

}

t := string(src[l.Type.Pos()-1 : l.Type.End()-1])

if len(names) > 0 {

typeSharingArgs := strings.Join(names, ", ")

parts = append(parts, fmt.Sprintf("%s %s", typeSharingArgs, t))

} else {

parts = append(parts, t)

}

}

return parts

}

func parseStruct(src []byte) (pkgName string, structs []string, methods map[string][]Method, imports []string, typeDoc map[string]string, err error) {

fset := token.NewFileSet()

a, err := parser.ParseFile(fset, "", src, parser.ParseComments)

if err != nil {

return

}

pkgName = a.Name.Name

for _, i := range a.Imports {

if i.Name != nil {

imports = append(imports, fmt.Sprintf("%s %s", i.Name.String(), i.Path.Value))

} else {

imports = append(imports, i.Path.Value)

}

}

methods = make(map[string][]Method)

for _, d := range a.Decls {

if structName, fd := getReceiverTypeName(src, d); structName != "" {

// 私有方法

if !fd.Name.IsExported() {

continue

}

params := formatFieldList(src, fd.Type.Params)

ret := formatFieldList(src, fd.Type.Results)

method := fmt.Sprintf("%s(%s) (%s)", fd.Name.String(), strings.Join(params, ", "), strings.Join(ret, ", "))

var docs []string

if fd.Doc != nil {

for _, d := range fd.Doc.List {

docs = append(docs, d.Text)

}

}

if _, ok := methods[structName]; !ok {

structs = append(structs, structName)

}

methods[structName] = append(methods[structName], Method{

Code: method,

Docs: docs,

})

}

}

typeDoc = make(map[string]string)

for _, t := range doc.New(&ast.Package{Files: map[string]*ast.File{"": a}}, "", doc.AllDecls).Types {

typeDoc[t.Name] = strings.TrimSuffix(t.Doc, "\n")

}

return

}

func formatCode(code string) ([]byte, error) {

opts := &imports.Options{

TabIndent: true,

TabWidth: 2,

Fragment: true,

Comments: true,

}

formatcode, err := imports.Process("", []byte(code), opts)

if err != nil {

return nil, err

}

if string(formatcode) == code {

return formatcode, err

}

return formatCode(string(formatcode))

}

func makeInterfaceHead(pkgName string, imports []string) []string {

output := []string{

"// Code generated by struct2interface; DO NOT EDIT.",

"",

"package " + pkgName,

"import (",

}

output = append(output, imports...)

output = append(output,

")",

"",

)

return output

}

func makeInterfaceBody(output []string, ifaceComment map[string]string, structName string, methods []string) []string {

comment := strings.TrimSuffix(strings.Replace(ifaceComment[structName], "\n", "\n//\t", -1), "\n//\t")

if len(strings.TrimSpace(comment)) > 0 {

output = append(output, fmt.Sprintf("// %s", comment))

}

output = append(output, fmt.Sprintf("type %s interface {", structName+"Interface"))

output = append(output, methods...)

output = append(output, "}")

return output

}

func createFile(objs map[string][]*makeInterfaceFile) error {

for dir, obj := range objs {

if len(obj) == 0 {

continue

}

var (

startTime = time.Now()

firstObj = obj[0]

pkgName = firstObj.PkgName

typeDoc = firstObj.TypeDoc

mapStructMethods = make(map[string][]string)

listStructMethods = make([]string, 0)

structAllImports = make([]string, 0)

)

for _, file := range obj {

for _, structName := range file.Structs {

if _, ok := mapStructMethods[structName]; ok {

mapStructMethods[structName] = append(mapStructMethods[structName], file.AllMethods[structName]...)

} else {

mapStructMethods[structName] = file.AllMethods[structName]

listStructMethods = append(listStructMethods, structName)

}

structAllImports = append(structAllImports, file.AllImports...)

}

}

output := makeInterfaceHead(pkgName, structAllImports)

for _, structName := range listStructMethods {

methods, ok := mapStructMethods[structName]

if !ok {

continue

}

output = makeInterfaceBody(output, typeDoc, structName, methods)

}

code := strings.Join(output, "\n")

result, err := formatCode(code)

if err != nil {

fmt.Printf("[struct2interface] %s \n", "formatCode error")

return err

}

fileName := filepath.Join(dir, "interface_"+pkgName+".go")

if err = os.WriteFile(fileName, result, 0o644); err != nil {

return err

}

fmt.Printf("[struct2interface] %s %s %s \n", "parsing", time.Since(startTime).String(), fileName)

}

return nil

}

func makeFile(file string) (*makeInterfaceFile, error) {

var (

allMethods = make(map[string][]string)

allImports = make([]string, 0)

iset = make(map[string]struct{})

typeDoc = make(map[string]string)

)

src, err := os.ReadFile(file)

if err != nil {

return nil, err

}

pkgName, structSlice, methods, importList, parsedTypeDoc, err := parseStruct(src)

if err != nil {

fmt.Printf("[struct2interface] %s, err: %s\n", "file parseStruct error", err.Error())

return nil, err

}

if len(methods) == 0 {

return nil, nil

}

for _, i := range importList {

if _, ok := iset[i]; !ok {

allImports = append(allImports, i)

iset[i] = struct{}{}

}

}

for structName, mm := range methods {

typeDoc[structName] = fmt.Sprintf("%s ...\n%s", structName+"Interface", parsedTypeDoc[structName])

for _, m := range mm {

allMethods[structName] = append(allMethods[structName], m.Lines()...)

}

}

return &makeInterfaceFile{

DirPath: filepath.Dir(file),

PkgName: pkgName,

Structs: structSlice,

TypeDoc: typeDoc,

AllMethods: allMethods,

AllImports: allImports,

}, nil

}

func MakeDir(dir string) error {

mapDirPath := make(map[string][]*makeInterfaceFile)

if err := filepath.WalkDir(dir, func(path string, d fs.DirEntry, err error) error {

if err != nil {

return err

}

if d.IsDir() {

return nil

}

if strings.HasPrefix(filepath.Base(path), "interface_") {

return nil

}

if strings.HasPrefix(filepath.Base(path), "mock_") {

return nil

}

if !strings.HasSuffix(filepath.Base(path), ".go") {

return nil

}

result, err := makeFile(path)

if err != nil {

log.Panic("struct2interface.Make failed,", err.Error(), path)

} else if result == nil {

return nil

}

if _, ok := mapDirPath[filepath.Dir(path)]; ok {

mapDirPath[filepath.Dir(path)] = append(mapDirPath[filepath.Dir(path)], result)

} else {

mapDirPath[filepath.Dir(path)] = []*makeInterfaceFile{result}

}

return nil

}); err != nil {

fmt.Printf("[struct2interface] %s \n", err.Error())

return err

}

return createFile(mapDirPath)

}