if content == "" {
		return "", fmt.Errorf("empty Go source file")
	}
	fset := token.NewFileSet()
	f, err := parser.ParseFile(fset, "", content, parser.ParseComments|parser.PackageClauseOnly)
	if err != nil {
		return "", fmt.Errorf("not a Go source file")
	}
	if f.Doc == nil {
		return "", fmt.Errorf("Go source file has no package doc comment")
	}

// Package comment.
package p

// Does match even though it's inside general comment (/*-style).
`, true},
	} {
		fset := token.NewFileSet()
		f, err := parser.ParseFile(fset, "", test.src, parser.PackageClauseOnly|parser.ParseComments)
		if f == nil {
			t.Fatalf("parse %d failed to return AST: %v", i, err)
		}

		got := ast.IsGenerated(f)
		if got != test.want {

	return isGoFile(dir) &&
		!strings.HasSuffix(dir.Name(), "_test.go") // ignore test files
}

func pkgName(filename string) string {
	file, err := parser.ParseFile(token.NewFileSet(), filename, nil, parser.PackageClauseOnly)
	if err != nil || file == nil {
		return ""
	}
	return file.Name.Name
}

func parseDir(dirpath string) map[string]*ast.Package {
	// the package name is the directory name within its parent.

	}
	return os.ReadFile(filename)
}

// A Mode value is a set of flags (or 0).
// They control the amount of source code parsed and other optional
// parser functionality.
type Mode uint

const (
	PackageClauseOnly    Mode             = 1 << iota // stop parsing after package clause
	ImportsOnly                                       // stop parsing after import declarations

	src, err := os.ReadFile(absFile)
	if err != nil {
		log.Fatalf("generate: %s", err)
	}

	// Parse package clause
	filePkg, err := parser.ParseFile(token.NewFileSet(), "", src, parser.PackageClauseOnly)
	if err != nil {
		// Invalid package clause - ignore file.
		return true
	}

	g := &Generator{
		r:        bytes.NewReader(src),
		path:     absFile,
		pkg:      filePkg.Name.String(),

	"go/scanner"
	"go/token"
)

// The mode parameter to the Parse* functions is a set of flags (or 0).
// They control the amount of source code parsed and other optional
// parser functionality.
const (
	PackageClauseOnly uint = 1 << iota // parsing stops after package clause
	ImportsOnly                        // parsing stops after import declarations
	ParseComments                      // parse comments and add them to AST

//
// The syntax tree must have been parsed with the [parser.ParseComments] flag.
// Example:
//
//	f, err := parser.ParseFile(fset, filename, src, parser.ParseComments|parser.PackageClauseOnly)
//	if err != nil { ... }
//	gen := ast.IsGenerated(f)
func IsGenerated(file *File) bool {
	_, ok := generator(file)
	return ok
}

func generator(file *File) (string, bool) {

	// Don't bother parsing the rest if we had errors parsing the package clause.
	// Likely not a Go source file at all.
	if p.errors.Len() != 0 {
		return nil
	}

	var decls []ast.Decl
	if p.mode&PackageClauseOnly == 0 {
		// import decls
		for p.tok == token.IMPORT {
			decls = append(decls, p.parseGenDecl(token.IMPORT, p.parseImportSpec))
		}

		if p.mode&ImportsOnly == 0 {
			// rest of package body

		{"ForCompiler", Func, 12},
		{"Lookup", Type, 5},
	},
	"go/parser": {
		{"AllErrors", Const, 1},
		{"DeclarationErrors", Const, 0},
		{"ImportsOnly", Const, 0},
		{"Mode", Type, 0},
		{"PackageClauseOnly", Const, 0},
		{"ParseComments", Const, 0},
		{"ParseDir", Func, 0},
		{"ParseExpr", Func, 0},
		{"ParseExprFrom", Func, 5},
		{"ParseFile", Func, 0},
		{"SkipObjectResolution", Const, 17},

pkg go/doc, type Value struct, Doc string
pkg go/doc, type Value struct, Names []string
pkg go/parser, const DeclarationErrors Mode
pkg go/parser, const ImportsOnly Mode
pkg go/parser, const PackageClauseOnly Mode
pkg go/parser, const ParseComments Mode
pkg go/parser, const SpuriousErrors Mode
pkg go/parser, const Trace Mode