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

func ExampleParseFile() {
	fset := token.NewFileSet() // positions are relative to fset

	src := `package foo

import (
	"fmt"
	"time"
)

func bar() {
	fmt.Println(time.Now())
}`

	// Parse src but stop after processing the imports.
	f, err := parser.ParseFile(fset, "", src, parser.ImportsOnly)
	if err != nil {
		fmt.Println(err)
		return
	}

	node, err := parser.ParseExpr(expr)
	if err != nil {
		log.Fatal(err)
	}

	// Create a FileSet for node. Since the node does not come
	// from a real source file, fset will be empty.
	fset := token.NewFileSet()

	var buf bytes.Buffer
	err = format.Node(&buf, fset, node)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(buf.String())

	// Output: (6 + 2*3) / 4

	// Choose an arbitrary, large package.
	path := filepath.Join(runtime.GOROOT(), "src", "net", "http")

	fset := token.NewFileSet()
	files, err := pkgFiles(fset, path)
	if err != nil {
		b.Fatal(err)
	}

	conf := Config{
		Importer: importer.Default(),
	}

	pkg, err := conf.Check("http", fset, files, nil)
	if err != nil {
		b.Fatal(err)
	}

	scope := pkg.Scope()
	names := scope.Names()

func (t2) f1() {}

func (x *t2) f2() {}
`

func TestFilterDuplicates(t *testing.T) {
	// parse input
	fset := token.NewFileSet()
	file, err := parser.ParseFile(fset, "", input, 0)
	if err != nil {
		t.Fatal(err)
	}

	// create package
	files := map[string]*ast.File{"": file}
	pkg, err := ast.NewPackage(fset, files, nil, nil)
	if err != nil {
		t.Fatal(err)
	}

	// filter

// Deprecated: If lookup is nil, for backwards-compatibility, the importer
// will attempt to resolve imports in the $GOPATH workspace.
func ForCompiler(fset *token.FileSet, compiler string, lookup Lookup) types.Importer {
	switch compiler {
	case "gc":
		return &gcimports{
			fset:     fset,
			packages: make(map[string]*types.Package),
			lookup:   lookup,
		}

	case "gccgo":
		var inst gccgoimporter.GccgoInstallation

func NewCommentMap(fset *token.FileSet, node Node, comments []*CommentGroup) CommentMap {
	if len(comments) == 0 {
		return nil // no comments to map
	}

	cmap := make(CommentMap)

	// set up comment reader r
	tmp := make([]*CommentGroup, len(comments))
	copy(tmp, comments) // don't change incoming comments
	sortComments(tmp)
	r := commentListReader{fset: fset, list: tmp} // !r.eol() because len(comments) > 0

	VPDI $0x4, Z1H, Z1H, Z1H
	VL   64(P1ptr), Z1L
	VPDI $0x4, Z1L, Z1L, Z1L

	VLREPG sel+32(FP), SEL1
	VZERO  ZER
	VCEQG  SEL1, ZER, SEL1

	VSEL X1L, X3L, SEL1, X3L
	VSEL X1H, X3H, SEL1, X3H
	VSEL Y1L, Y3L, SEL1, Y3L
	VSEL Y1H, Y3H, SEL1, Y3H
	VSEL Z1L, Z3L, SEL1, Z3L
	VSEL Z1H, Z3H, SEL1, Z3H

	//	if (zero == 0) {
	//		copy(P3.x[:], X2)
	//		copy(P3.y[:], Y2)

		// The absolute position is the exact position in the source.
		pos := decl.Pos()
		relPosition := fset.Position(pos)
		absPosition := fset.PositionFor(pos, false)

		// Either a FuncDecl or GenDecl, since we exit on error.
		kind := "func"
		if gen, ok := decl.(*ast.GenDecl); ok {
			kind = gen.Tok.String()
		}

		// If the relative and absolute positions differ, show both.

func BenchmarkResolve(b *testing.B) {
	b.SetBytes(int64(len(src)))
	for i := 0; i < b.N; i++ {
		b.StopTimer()
		fset := token.NewFileSet()
		file, err := ParseFile(fset, "", src, SkipObjectResolution)
		if err != nil {
			b.Fatalf("benchmark failed due to parse error: %s", err)
		}
		b.StartTimer()
		handle := fset.File(file.Package)
		resolveFile(file, handle, nil)
	}

		return err
	}

	file, err := parser.ParseFile(fset, filename, src, parserMode)
	if err != nil {
		return err
	}

	// Make sure file is in canonical format.
	// This "fmt" pseudo-fix cannot be disabled.
	newSrc, err := gofmtFile(file)
	if err != nil {
		return err
	}
	if !bytes.Equal(newSrc, src) {
		newFile, err := parser.ParseFile(fset, filename, newSrc, parserMode)
		if err != nil {
			return err