Parsing Go source code using the Go AST. https://play.golang.org/p/DGsfPkmZXD3

gistfile1.txt

package main

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

// https://pkg.go.dev/go/ast?tab=doc#Object.Type

func main() {
	fset := token.NewFileSet()

	src := `package foo

	type User struct {
		ID          uint64
		Name        string
		URL         string
		Disabled    bool
		Age int
	}`

	f, err := parser.ParseFile(fset, "", src, 0)
	if err != nil {
		fmt.Println(err)
		return
	}

	// Full tree
	//ast.Fprint(os.Stdout, fset, f, func(name string, value reflect.Value) bool { return true })

	for _, decl := range f.Decls {
		switch d := decl.(type) {
		case *ast.GenDecl:
			for _, spec := range d.Specs {

				s, ok := spec.(*ast.TypeSpec)
				if !ok {
					continue
				}

				t, ok := s.Type.(*ast.StructType)
				if !ok {
					continue
				}

				fmt.Printf("type %s struct:\n", s.Name)

				for _, f := range t.Fields.List {

					// fmt.Printf("\tfield: %+v\n", f)

					fieldType, ok := f.Type.(*ast.Ident)
					if !ok {
						continue
					}

					name := f.Names[0].Name
					fmt.Printf("\t%s %s\n", name, fieldType.Name)
				}

			}
		}
	}
}