2022-11-13：以下go语言代码中，如何获取结构体列表以及结构体内的指针方法列表？以下代码应该返回{"S1":["M1",

package main
type S1 struct{}
func (this *S1) M1() {}
func (this *S1) M2() {}
func (this S1) M3() {}
type S2 struct{}
type S3 struct{}
func (this *S3) M1() {}
func (this S3) M2() {}
func (this *S3) M3() {}

package main

import (
  "encoding/json"
  "fmt"
  "go/ast"
  "go/parser"
  "go/token"
)

const content = `package main
type S1 struct{}
func (this *S1) M1() {}
func (this *S1) M2() {}
func (this S1) M3() {}
type S2 struct{}
type S3 struct{}
func (this *S3) M1() {}
func (this S3) M2() {}
func (this *S3) M3() {}`

func main() {
  fset := token.NewFileSet()
  f, err := parser.ParseFile(fset, "", content, parser.ParseComments)
  if err != nil {
    fmt.Println(err)
    return
  }

  structInfoList := make([]*StructInfo, 0)
  structInfoMap := make(map[string]*StructInfo)

  // 找结构体
  for i := 0; i < len(f.Decls); i++ {
    decl, ok := f.Decls[i].(*ast.GenDecl)
    if !ok {
      continue
    }
    if decl.Tok != token.TYPE {
      continue
    }
    if len(decl.Specs) != 1 {
      continue
    }
    spec, ok2 := decl.Specs[0].(*ast.TypeSpec)
    if !ok2 {
      continue
    }
    structType, ok3 := spec.Type.(*ast.StructType)
    if !ok3 {
      fmt.Println("失败", structType)
      continue
    }
    structInfo := NewStructInfo(spec.Name.Name)
    structInfoList = append(structInfoList, structInfo)
    structInfoMap[spec.Name.Name] = structInfo
  }

  // 找方法
  for i := 0; i < len(f.Decls); i++ {
    decl, ok := f.Decls[i].(*ast.FuncDecl)
    if !ok {
      continue
    }
    if decl.Recv == nil || len(decl.Recv.List) != 1 {
      continue
    }
    structName := ""
    switch decl.Recv.List[0].Type.(type) {
    case *ast.StarExpr: //指针方法
      structName = decl.Recv.List[0].Type.(*ast.StarExpr).X.(*ast.Ident).Name
    case *ast.Ident: //普通方法
      //structName = decl.Recv.List[0].Type.(*ast.Ident).Name
    }
    if structInfo, ok := structInfoMap[structName]; ok {
      structInfo.MethodNameList = append(structInfo.MethodNameList, decl.Name.Name)
    }
  }

  // 输出
  data, _ := json.MarshalIndent(structInfoList, "", "  ")
  fmt.Println(string(data))
}

type StructInfo struct {
  StructName     string   `json:"structName,omitempty"`
  MethodNameList []string `json:"methodNameList,omitempty"`
}

func NewStructInfo(structName string) *StructInfo {
  return &StructInfo{StructName: structName, MethodNameList: make([]string, 0)}
}