Ejemplo n.º 1
0
// TestLineComments, using a simple test case, checks that consecutive line
// comments are properly terminated with a newline even if the AST position
// information is incorrect.
//
func TestLineComments(t *testing.T) {
	const src = `// comment 1
	// comment 2
	// comment 3
	package main
	`

	fset := token.NewFileSet()
	f, err := parser.ParseFile(fset, "", src, parser.ParseComments)
	if err != nil {
		panic(err) // error in test
	}

	var buf bytes.Buffer
	fset = token.NewFileSet() // use the wrong file set
	Fprint(&buf, fset, f)

	nlines := 0
	for _, ch := range buf.Bytes() {
		if ch == '\n' {
			nlines++
		}
	}

	const expected = 3
	if nlines < expected {
		t.Errorf("got %d, expected %d\n", nlines, expected)
		t.Errorf("result:\n%s", buf.Bytes())
	}
}
Ejemplo n.º 2
0
func TestLeadAndLineComments(t *testing.T) {
	f, err := ParseFile(token.NewFileSet(), "", `
package p
type T struct {
	/* F1 lead comment */
	//
	F1 int  /* F1 */ // line comment
	// F2 lead
	// comment
	F2 int  // F2 line comment
	// f3 lead comment
	f3 int  // f3 line comment
}
`, ParseComments)
	if err != nil {
		t.Fatal(err)
	}
	checkFieldComments(t, f, "T.F1", "/* F1 lead comment *///", "/* F1 */// line comment")
	checkFieldComments(t, f, "T.F2", "// F2 lead// comment", "// F2 line comment")
	checkFieldComments(t, f, "T.f3", "// f3 lead comment", "// f3 line comment")
	ast.FileExports(f)
	checkFieldComments(t, f, "T.F1", "/* F1 lead comment *///", "/* F1 */// line comment")
	checkFieldComments(t, f, "T.F2", "// F2 lead// comment", "// F2 line comment")
	if getField(f, "T.f3") != nil {
		t.Error("not expected to find T.f3")
	}
}
Ejemplo n.º 3
0
// TestIncompleteSelection ensures that an incomplete selector
// expression is parsed as a (blank) *ast.SelectorExpr, not a
// *ast.BadExpr.
func TestIncompleteSelection(t *testing.T) {
	for _, src := range []string{
		"package p; var _ = fmt.",             // at EOF
		"package p; var _ = fmt.\ntype X int", // not at EOF
	} {
		fset := token.NewFileSet()
		f, err := ParseFile(fset, "", src, 0)
		if err == nil {
			t.Errorf("ParseFile(%s) succeeded unexpectedly", src)
			continue
		}

		const wantErr = "expected selector or type assertion"
		if !strings.Contains(err.Error(), wantErr) {
			t.Errorf("ParseFile returned wrong error %q, want %q", err, wantErr)
		}

		var sel *ast.SelectorExpr
		ast.Inspect(f, func(n ast.Node) bool {
			if n, ok := n.(*ast.SelectorExpr); ok {
				sel = n
			}
			return true
		})
		if sel == nil {
			t.Error("found no *ast.SelectorExpr")
			continue
		}
		const wantSel = "&{fmt _}"
		if fmt.Sprint(sel) != wantSel {
			t.Errorf("found selector %s, want %s", sel, wantSel)
			continue
		}
	}
}
Ejemplo n.º 4
0
func TestUnresolved(t *testing.T) {
	f, err := ParseFile(token.NewFileSet(), "", `
package p
//
func f1a(int)
func f2a(byte, int, float)
func f3a(a, b int, c float)
func f4a(...complex)
func f5a(a s1a, b ...complex)
//
func f1b(*int)
func f2b([]byte, (int), *float)
func f3b(a, b *int, c []float)
func f4b(...*complex)
func f5b(a s1a, b ...[]complex)
//
type s1a struct { int }
type s2a struct { byte; int; s1a }
type s3a struct { a, b int; c float }
//
type s1b struct { *int }
type s2b struct { byte; int; *float }
type s3b struct { a, b *s3b; c []float }
`, 0)
	if err != nil {
		t.Fatal(err)
	}

	want := "int " + // f1a
		"byte int float " + // f2a
		"int float " + // f3a
		"complex " + // f4a
		"complex " + // f5a
		//
		"int " + // f1b
		"byte int float " + // f2b
		"int float " + // f3b
		"complex " + // f4b
		"complex " + // f5b
		//
		"int " + // s1a
		"byte int " + // s2a
		"int float " + // s3a
		//
		"int " + // s1a
		"byte int float " + // s2a
		"float " // s3a

	// collect unresolved identifiers
	var buf bytes.Buffer
	for _, u := range f.Unresolved {
		buf.WriteString(u.Name)
		buf.WriteByte(' ')
	}
	got := buf.String()

	if got != want {
		t.Errorf("\ngot:  %s\nwant: %s", got, want)
	}
}
Ejemplo n.º 5
0
func ExampleScanner_Scan() {
	// src is the input that we want to tokenize.
	src := []byte("cos(x) + 1i*sin(x) // Euler")

	// Initialize the scanner.
	var s scanner.Scanner
	fset := token.NewFileSet()                      // positions are relative to fset
	file := fset.AddFile("", fset.Base(), len(src)) // register input "file"
	s.Init(file, src, nil /* no error handler */, scanner.ScanComments)

	// Repeated calls to Scan yield the token sequence found in the input.
	for {
		pos, tok, lit := s.Scan()
		if tok == token.EOF {
			break
		}
		fmt.Printf("%s\t%s\t%q\n", fset.Position(pos), tok, lit)
	}

	// output:
	// 1:1	IDENT	"cos"
	// 1:4	(	""
	// 1:5	IDENT	"x"
	// 1:6	)	""
	// 1:8	+	""
	// 1:10	IMAG	"1i"
	// 1:12	*	""
	// 1:13	IDENT	"sin"
	// 1:16	(	""
	// 1:17	IDENT	"x"
	// 1:18	)	""
	// 1:20	;	"\n"
	// 1:20	COMMENT	"// Euler"
}
Ejemplo n.º 6
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func TestParse(t *testing.T) {
	for _, filename := range validFiles {
		_, err := ParseFile(token.NewFileSet(), filename, nil, DeclarationErrors)
		if err != nil {
			t.Fatalf("ParseFile(%s): %v", filename, err)
		}
	}
}
Ejemplo n.º 7
0
func BenchmarkParse(b *testing.B) {
	b.SetBytes(int64(len(src)))
	for i := 0; i < b.N; i++ {
		if _, err := ParseFile(token.NewFileSet(), "", src, ParseComments); err != nil {
			b.Fatalf("benchmark failed due to parse error: %s", err)
		}
	}
}
Ejemplo n.º 8
0
func TestImports(t *testing.T) {
	for path, isValid := range imports {
		src := fmt.Sprintf("package p; import %s", path)
		_, err := ParseFile(token.NewFileSet(), "", src, 0)
		switch {
		case err != nil && isValid:
			t.Errorf("ParseFile(%s): got %v; expected no error", src, err)
		case err == nil && !isValid:
			t.Errorf("ParseFile(%s): got no error; expected one", src)
		}
	}
}
Ejemplo n.º 9
0
func parseFunc(filename, functionname string) (fun *ast.FuncDecl, fset *token.FileSet) {
	fset = token.NewFileSet()
	if file, err := parser.ParseFile(fset, filename, nil, 0); err == nil {
		for _, d := range file.Decls {
			if f, ok := d.(*ast.FuncDecl); ok && f.Name.Name == functionname {
				fun = f
				return
			}
		}
	}
	panic("function not found")
}
Ejemplo n.º 10
0
func main() {
	flag.Parse()
	fset := token.NewFileSet()
	nheadings := 0
	err := filepath.Walk(*root, func(path string, fi os.FileInfo, err error) error {
		if !fi.IsDir() {
			return nil
		}
		pkgs, err := parser.ParseDir(fset, path, isGoFile, parser.ParseComments)
		if err != nil {
			if *verbose {
				fmt.Fprintln(os.Stderr, err)
			}
			return nil
		}
		for _, pkg := range pkgs {
			d := doc.New(pkg, path, doc.Mode(0))
			list := appendHeadings(nil, d.Doc)
			for _, d := range d.Consts {
				list = appendHeadings(list, d.Doc)
			}
			for _, d := range d.Types {
				list = appendHeadings(list, d.Doc)
			}
			for _, d := range d.Vars {
				list = appendHeadings(list, d.Doc)
			}
			for _, d := range d.Funcs {
				list = appendHeadings(list, d.Doc)
			}
			if len(list) > 0 {
				// directories may contain multiple packages;
				// print path and package name
				fmt.Printf("%s (package %s)\n", path, pkg.Name)
				for _, h := range list {
					fmt.Printf("\t%s\n", h)
				}
				nheadings += len(list)
			}
		}
		return nil
	})
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}
	fmt.Println(nheadings, "headings found")
}
Ejemplo n.º 11
0
func BenchmarkScan(b *testing.B) {
	b.StopTimer()
	fset := token.NewFileSet()
	file := fset.AddFile("", fset.Base(), len(source))
	var s Scanner
	b.StartTimer()
	for i := 0; i < b.N; i++ {
		s.Init(file, source, nil, ScanComments)
		for {
			_, tok, _ := s.Scan()
			if tok == token.EOF {
				break
			}
		}
	}
}
Ejemplo n.º 12
0
func TestCommentGroups(t *testing.T) {
	f, err := ParseFile(token.NewFileSet(), "", `
package p /* 1a */ /* 1b */      /* 1c */ // 1d
/* 2a
*/
// 2b
const pi = 3.1415
/* 3a */ // 3b
/* 3c */ const e = 2.7182

// Example from issue 3139
func ExampleCount() {
	fmt.Println(strings.Count("cheese", "e"))
	fmt.Println(strings.Count("five", "")) // before & after each rune
	// Output:
	// 3
	// 5
}
`, ParseComments)
	if err != nil {
		t.Fatal(err)
	}
	expected := [][]string{
		{"/* 1a */", "/* 1b */", "/* 1c */", "// 1d"},
		{"/* 2a\n*/", "// 2b"},
		{"/* 3a */", "// 3b", "/* 3c */"},
		{"// Example from issue 3139"},
		{"// before & after each rune"},
		{"// Output:", "// 3", "// 5"},
	}
	if len(f.Comments) != len(expected) {
		t.Fatalf("got %d comment groups; expected %d", len(f.Comments), len(expected))
	}
	for i, exp := range expected {
		got := f.Comments[i].List
		if len(got) != len(exp) {
			t.Errorf("got %d comments in group %d; expected %d", len(got), i, len(exp))
			continue
		}
		for j, exp := range exp {
			got := got[j].Text
			if got != exp {
				t.Errorf("got %q in group %d; expected %q", got, i, exp)
			}
		}
	}
}
Ejemplo n.º 13
0
func TestObjects(t *testing.T) {
	const src = `
package p
import fmt "fmt"
const pi = 3.14
type T struct{}
var x int
func f() { L: }
`

	f, err := ParseFile(token.NewFileSet(), "", src, 0)
	if err != nil {
		t.Fatal(err)
	}

	objects := map[string]ast.ObjKind{
		"p":   ast.Bad, // not in a scope
		"fmt": ast.Bad, // not resolved yet
		"pi":  ast.Con,
		"T":   ast.Typ,
		"x":   ast.Var,
		"int": ast.Bad, // not resolved yet
		"f":   ast.Fun,
		"L":   ast.Lbl,
	}

	ast.Inspect(f, func(n ast.Node) bool {
		if ident, ok := n.(*ast.Ident); ok {
			obj := ident.Obj
			if obj == nil {
				if objects[ident.Name] != ast.Bad {
					t.Errorf("no object for %s", ident.Name)
				}
				return true
			}
			if obj.Name != ident.Name {
				t.Errorf("names don't match: obj.Name = %s, ident.Name = %s", obj.Name, ident.Name)
			}
			kind := objects[ident.Name]
			if obj.Kind != kind {
				t.Errorf("%s: obj.Kind = %s; want %s", ident.Name, obj.Kind, kind)
			}
		}
		return true
	})
}
Ejemplo n.º 14
0
// TestIssue9979 verifies that empty statements are contained within their enclosing blocks.
func TestIssue9979(t *testing.T) {
	for _, src := range []string{
		"package p; func f() {;}",
		"package p; func f() {L:}",
		"package p; func f() {L:;}",
		"package p; func f() {L:\n}",
		"package p; func f() {L:\n;}",
		"package p; func f() { ; }",
		"package p; func f() { L: }",
		"package p; func f() { L: ; }",
		"package p; func f() { L: \n}",
		"package p; func f() { L: \n; }",
	} {
		fset := token.NewFileSet()
		f, err := ParseFile(fset, "", src, 0)
		if err != nil {
			t.Fatal(err)
		}

		var pos, end token.Pos
		ast.Inspect(f, func(x ast.Node) bool {
			switch s := x.(type) {
			case *ast.BlockStmt:
				pos, end = s.Pos()+1, s.End()-1 // exclude "{", "}"
			case *ast.LabeledStmt:
				pos, end = s.Pos()+2, s.End() // exclude "L:"
			case *ast.EmptyStmt:
				// check containment
				if s.Pos() < pos || s.End() > end {
					t.Errorf("%s: %T[%d, %d] not inside [%d, %d]", src, s, s.Pos(), s.End(), pos, end)
				}
				// check semicolon
				offs := fset.Position(s.Pos()).Offset
				if ch := src[offs]; ch != ';' != s.Implicit {
					want := "want ';'"
					if s.Implicit {
						want = "but ';' is implicit"
					}
					t.Errorf("%s: found %q at offset %d; %s", src, ch, offs, want)
				}
			}
			return true
		})
	}
}
Ejemplo n.º 15
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func TestVarScope(t *testing.T) {
	f, err := ParseFile(token.NewFileSet(), "", `package p; func f() { var x, y, z = x, y, z }`, 0)
	if err != nil {
		t.Fatal(err)
	}

	// RHS refers to undefined globals; LHS does not.
	as := f.Decls[0].(*ast.FuncDecl).Body.List[0].(*ast.DeclStmt).Decl.(*ast.GenDecl).Specs[0].(*ast.ValueSpec)
	for _, v := range as.Values {
		id := v.(*ast.Ident)
		if id.Obj != nil {
			t.Errorf("rhs %s has Obj, should not", id.Name)
		}
	}
	for _, id := range as.Names {
		if id.Obj == nil {
			t.Errorf("lhs %s does not have Obj, should", id.Name)
		}
	}
}
Ejemplo n.º 16
0
func TestColonEqualsScope(t *testing.T) {
	f, err := ParseFile(token.NewFileSet(), "", `package p; func f() { x, y, z := x, y, z }`, 0)
	if err != nil {
		t.Fatal(err)
	}

	// RHS refers to undefined globals; LHS does not.
	as := f.Decls[0].(*ast.FuncDecl).Body.List[0].(*ast.AssignStmt)
	for _, v := range as.Rhs {
		id := v.(*ast.Ident)
		if id.Obj != nil {
			t.Errorf("rhs %s has Obj, should not", id.Name)
		}
	}
	for _, v := range as.Lhs {
		id := v.(*ast.Ident)
		if id.Obj == nil {
			t.Errorf("lhs %s does not have Obj, should", id.Name)
		}
	}
}
Ejemplo n.º 17
0
func BenchmarkScanFile(b *testing.B) {
	b.StopTimer()
	const filename = "scanner.go"
	src, err := ioutil.ReadFile(filename)
	if err != nil {
		panic(err)
	}
	fset := token.NewFileSet()
	file := fset.AddFile(filename, fset.Base(), len(src))
	b.SetBytes(int64(len(src)))
	var s Scanner
	b.StartTimer()
	for i := 0; i < b.N; i++ {
		s.Init(file, src, nil, ScanComments)
		for {
			_, tok, _ := s.Scan()
			if tok == token.EOF {
				break
			}
		}
	}
}
Ejemplo n.º 18
0
func ExampleParseFile() {
	fset := token.NewFileSet() // positions are relative to fset

	// Parse the file containing this very example
	// but stop after processing the imports.
	f, err := parser.ParseFile(fset, "example_test.go", nil, parser.ImportsOnly)
	if err != nil {
		fmt.Println(err)
		return
	}

	// Print the imports from the file's AST.
	for _, s := range f.Imports {
		fmt.Println(s.Path.Value)
	}

	// output:
	//
	// "fmt"
	// "github.com/jchauncey/kubeclient/third_party/golang/go/parser"
	// "github.com/jchauncey/kubeclient/third_party/golang/go/token"
}
Ejemplo n.º 19
0
func checkErrors(t *testing.T, filename string, input interface{}) {
	src, err := readSource(filename, input)
	if err != nil {
		t.Error(err)
		return
	}

	fset := token.NewFileSet()
	_, err = ParseFile(fset, filename, src, DeclarationErrors|AllErrors)
	found, ok := err.(scanner.ErrorList)
	if err != nil && !ok {
		t.Error(err)
		return
	}
	found.RemoveMultiples()

	// we are expecting the following errors
	// (collect these after parsing a file so that it is found in the file set)
	expected := expectedErrors(t, fset, filename, src)

	// verify errors returned by the parser
	compareErrors(t, fset, expected, found)
}
Ejemplo n.º 20
0
func TestParseDir(t *testing.T) {
	path := "."
	pkgs, err := ParseDir(token.NewFileSet(), path, dirFilter, 0)
	if err != nil {
		t.Fatalf("ParseDir(%s): %v", path, err)
	}
	if n := len(pkgs); n != 1 {
		t.Errorf("got %d packages; want 1", n)
	}
	pkg := pkgs["parser"]
	if pkg == nil {
		t.Errorf(`package "parser" not found`)
		return
	}
	if n := len(pkg.Files); n != 3 {
		t.Errorf("got %d package files; want 3", n)
	}
	for filename := range pkg.Files {
		if !nameFilter(filename) {
			t.Errorf("unexpected package file: %s", filename)
		}
	}
}
Ejemplo n.º 21
0
func TestCommentMap(t *testing.T) {
	fset := token.NewFileSet()
	f, err := parser.ParseFile(fset, "", src, parser.ParseComments)
	if err != nil {
		t.Fatal(err)
	}
	cmap := NewCommentMap(fset, f, f.Comments)

	// very correct association of comments
	for n, list := range cmap {
		key := fmt.Sprintf("%2d: %T", fset.Position(n.Pos()).Line, n)
		got := ctext(list)
		want := res[key]
		if got != want {
			t.Errorf("%s: got %q; want %q", key, got, want)
		}
	}

	// verify that no comments got lost
	if n := len(cmap.Comments()); n != len(f.Comments) {
		t.Errorf("got %d comment groups in map; want %d", n, len(f.Comments))
	}

	// support code to update test:
	// set genMap to true to generate res map
	const genMap = false
	if genMap {
		out := make([]string, 0, len(cmap))
		for n, list := range cmap {
			out = append(out, fmt.Sprintf("\t\"%2d: %T\":\t%q,", fset.Position(n.Pos()).Line, n, ctext(list)))
		}
		sort.Strings(out)
		for _, s := range out {
			fmt.Println(s)
		}
	}
}
Ejemplo n.º 22
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func test(t *testing.T, mode Mode) {
	// determine file filter
	filter := isGoFile
	if *files != "" {
		rx, err := regexp.Compile(*files)
		if err != nil {
			t.Fatal(err)
		}
		filter = func(fi os.FileInfo) bool {
			return isGoFile(fi) && rx.MatchString(fi.Name())
		}
	}

	// get packages
	fset := token.NewFileSet()
	pkgs, err := parser.ParseDir(fset, dataDir, filter, parser.ParseComments)
	if err != nil {
		t.Fatal(err)
	}

	// test packages
	for _, pkg := range pkgs {
		importpath := dataDir + "/" + pkg.Name
		doc := New(pkg, importpath, mode)

		// golden files always use / in filenames - canonicalize them
		for i, filename := range doc.Filenames {
			doc.Filenames[i] = filepath.ToSlash(filename)
		}

		// print documentation
		var buf bytes.Buffer
		if err := templateTxt.Execute(&buf, bundle{doc, fset}); err != nil {
			t.Error(err)
			continue
		}
		got := buf.Bytes()

		// update golden file if necessary
		golden := filepath.Join(dataDir, fmt.Sprintf("%s.%d.golden", pkg.Name, mode))
		if *update {
			err := ioutil.WriteFile(golden, got, 0644)
			if err != nil {
				t.Error(err)
			}
			continue
		}

		// get golden file
		want, err := ioutil.ReadFile(golden)
		if err != nil {
			t.Error(err)
			continue
		}

		// compare
		if !bytes.Equal(got, want) {
			t.Errorf("package %s\n\tgot:\n%s\n\twant:\n%s", pkg.Name, got, want)
		}
	}
}
Ejemplo n.º 23
0
// ParseExpr is a convenience function for obtaining the AST of an expression x.
// The position information recorded in the AST is undefined. The filename used
// in error messages is the empty string.
//
func ParseExpr(x string) (ast.Expr, error) {
	return ParseExprFrom(token.NewFileSet(), "", []byte(x), 0)
}
Ejemplo n.º 24
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// Import returns details about the Go package named by the import path,
// interpreting local import paths relative to the srcDir directory.
// If the path is a local import path naming a package that can be imported
// using a standard import path, the returned package will set p.ImportPath
// to that path.
//
// In the directory containing the package, .go, .c, .h, and .s files are
// considered part of the package except for:
//
//	- .go files in package documentation
//	- files starting with _ or . (likely editor temporary files)
//	- files with build constraints not satisfied by the context
//
// If an error occurs, Import returns a non-nil error and a non-nil
// *Package containing partial information.
//
func (ctxt *Context) Import(path string, srcDir string, mode ImportMode) (*Package, error) {
	p := &Package{
		ImportPath: path,
	}
	if path == "" {
		return p, fmt.Errorf("import %q: invalid import path", path)
	}

	var pkgtargetroot string
	var pkga string
	var pkgerr error
	suffix := ""
	if ctxt.InstallSuffix != "" {
		suffix = "_" + ctxt.InstallSuffix
	}
	switch ctxt.Compiler {
	case "gccgo":
		pkgtargetroot = "pkg/gccgo_" + ctxt.GOOS + "_" + ctxt.GOARCH + suffix
		dir, elem := pathpkg.Split(p.ImportPath)
		pkga = pkgtargetroot + "/" + dir + "lib" + elem + ".a"
	case "gc":
		pkgtargetroot = "pkg/" + ctxt.GOOS + "_" + ctxt.GOARCH + suffix
		pkga = pkgtargetroot + "/" + p.ImportPath + ".a"
	default:
		// Save error for end of function.
		pkgerr = fmt.Errorf("import %q: unknown compiler %q", path, ctxt.Compiler)
	}

	binaryOnly := false
	if IsLocalImport(path) {
		pkga = "" // local imports have no installed path
		if srcDir == "" {
			return p, fmt.Errorf("import %q: import relative to unknown directory", path)
		}
		if !ctxt.isAbsPath(path) {
			p.Dir = ctxt.joinPath(srcDir, path)
		}
		// Determine canonical import path, if any.
		// Exclude results where the import path would include /testdata/.
		inTestdata := func(sub string) bool {
			return strings.Contains(sub, "/testdata/") || strings.HasSuffix(sub, "/testdata") || strings.HasPrefix(sub, "testdata/") || sub == "testdata"
		}
		if ctxt.GOROOT != "" {
			root := ctxt.joinPath(ctxt.GOROOT, "src")
			if sub, ok := ctxt.hasSubdir(root, p.Dir); ok && !inTestdata(sub) {
				p.Goroot = true
				p.ImportPath = sub
				p.Root = ctxt.GOROOT
				goto Found
			}
		}
		all := ctxt.gopath()
		for i, root := range all {
			rootsrc := ctxt.joinPath(root, "src")
			if sub, ok := ctxt.hasSubdir(rootsrc, p.Dir); ok && !inTestdata(sub) {
				// We found a potential import path for dir,
				// but check that using it wouldn't find something
				// else first.
				if ctxt.GOROOT != "" {
					if dir := ctxt.joinPath(ctxt.GOROOT, "src", sub); ctxt.isDir(dir) {
						p.ConflictDir = dir
						goto Found
					}
				}
				for _, earlyRoot := range all[:i] {
					if dir := ctxt.joinPath(earlyRoot, "src", sub); ctxt.isDir(dir) {
						p.ConflictDir = dir
						goto Found
					}
				}

				// sub would not name some other directory instead of this one.
				// Record it.
				p.ImportPath = sub
				p.Root = root
				goto Found
			}
		}
		// It's okay that we didn't find a root containing dir.
		// Keep going with the information we have.
	} else {
		if strings.HasPrefix(path, "/") {
			return p, fmt.Errorf("import %q: cannot import absolute path", path)
		}

		// tried records the location of unsuccessful package lookups
		var tried struct {
			goroot string
			gopath []string
		}

		// Determine directory from import path.
		if ctxt.GOROOT != "" {
			dir := ctxt.joinPath(ctxt.GOROOT, "src", path)
			isDir := ctxt.isDir(dir)
			binaryOnly = !isDir && mode&AllowBinary != 0 && pkga != "" && ctxt.isFile(ctxt.joinPath(ctxt.GOROOT, pkga))
			if isDir || binaryOnly {
				p.Dir = dir
				p.Goroot = true
				p.Root = ctxt.GOROOT
				goto Found
			}
			tried.goroot = dir
		}
		for _, root := range ctxt.gopath() {
			dir := ctxt.joinPath(root, "src", path)
			isDir := ctxt.isDir(dir)
			binaryOnly = !isDir && mode&AllowBinary != 0 && pkga != "" && ctxt.isFile(ctxt.joinPath(root, pkga))
			if isDir || binaryOnly {
				p.Dir = dir
				p.Root = root
				goto Found
			}
			tried.gopath = append(tried.gopath, dir)
		}

		// package was not found
		var paths []string
		if tried.goroot != "" {
			paths = append(paths, fmt.Sprintf("\t%s (from $GOROOT)", tried.goroot))
		} else {
			paths = append(paths, "\t($GOROOT not set)")
		}
		var i int
		var format = "\t%s (from $GOPATH)"
		for ; i < len(tried.gopath); i++ {
			if i > 0 {
				format = "\t%s"
			}
			paths = append(paths, fmt.Sprintf(format, tried.gopath[i]))
		}
		if i == 0 {
			paths = append(paths, "\t($GOPATH not set)")
		}
		return p, fmt.Errorf("cannot find package %q in any of:\n%s", path, strings.Join(paths, "\n"))
	}

Found:
	if p.Root != "" {
		p.SrcRoot = ctxt.joinPath(p.Root, "src")
		p.PkgRoot = ctxt.joinPath(p.Root, "pkg")
		p.BinDir = ctxt.joinPath(p.Root, "bin")
		if pkga != "" {
			p.PkgTargetRoot = ctxt.joinPath(p.Root, pkgtargetroot)
			p.PkgObj = ctxt.joinPath(p.Root, pkga)
		}
	}

	if mode&FindOnly != 0 {
		return p, pkgerr
	}
	if binaryOnly && (mode&AllowBinary) != 0 {
		return p, pkgerr
	}

	dirs, err := ctxt.readDir(p.Dir)
	if err != nil {
		return p, err
	}

	var Sfiles []string // files with ".S" (capital S)
	var firstFile, firstCommentFile string
	imported := make(map[string][]token.Position)
	testImported := make(map[string][]token.Position)
	xTestImported := make(map[string][]token.Position)
	allTags := make(map[string]bool)
	fset := token.NewFileSet()
	for _, d := range dirs {
		if d.IsDir() {
			continue
		}

		name := d.Name()
		ext := nameExt(name)

		match, data, filename, err := ctxt.matchFile(p.Dir, name, true, allTags)
		if err != nil {
			return p, err
		}
		if !match {
			if ext == ".go" {
				p.IgnoredGoFiles = append(p.IgnoredGoFiles, name)
			}
			continue
		}

		// Going to save the file.  For non-Go files, can stop here.
		switch ext {
		case ".c":
			p.CFiles = append(p.CFiles, name)
			continue
		case ".cc", ".cpp", ".cxx":
			p.CXXFiles = append(p.CXXFiles, name)
			continue
		case ".m":
			p.MFiles = append(p.MFiles, name)
			continue
		case ".h", ".hh", ".hpp", ".hxx":
			p.HFiles = append(p.HFiles, name)
			continue
		case ".s":
			p.SFiles = append(p.SFiles, name)
			continue
		case ".S":
			Sfiles = append(Sfiles, name)
			continue
		case ".swig":
			p.SwigFiles = append(p.SwigFiles, name)
			continue
		case ".swigcxx":
			p.SwigCXXFiles = append(p.SwigCXXFiles, name)
			continue
		case ".syso":
			// binary objects to add to package archive
			// Likely of the form foo_windows.syso, but
			// the name was vetted above with goodOSArchFile.
			p.SysoFiles = append(p.SysoFiles, name)
			continue
		}

		pf, err := parser.ParseFile(fset, filename, data, parser.ImportsOnly|parser.ParseComments)
		if err != nil {
			return p, err
		}

		pkg := pf.Name.Name
		if pkg == "documentation" {
			p.IgnoredGoFiles = append(p.IgnoredGoFiles, name)
			continue
		}

		isTest := strings.HasSuffix(name, "_test.go")
		isXTest := false
		if isTest && strings.HasSuffix(pkg, "_test") {
			isXTest = true
			pkg = pkg[:len(pkg)-len("_test")]
		}

		if p.Name == "" {
			p.Name = pkg
			firstFile = name
		} else if pkg != p.Name {
			return p, &MultiplePackageError{
				Dir:      p.Dir,
				Packages: []string{p.Name, pkg},
				Files:    []string{firstFile, name},
			}
		}
		if pf.Doc != nil && p.Doc == "" {
			p.Doc = doc.Synopsis(pf.Doc.Text())
		}

		if mode&ImportComment != 0 {
			qcom, line := findImportComment(data)
			if line != 0 {
				com, err := strconv.Unquote(qcom)
				if err != nil {
					return p, fmt.Errorf("%s:%d: cannot parse import comment", filename, line)
				}
				if p.ImportComment == "" {
					p.ImportComment = com
					firstCommentFile = name
				} else if p.ImportComment != com {
					return p, fmt.Errorf("found import comments %q (%s) and %q (%s) in %s", p.ImportComment, firstCommentFile, com, name, p.Dir)
				}
			}
		}

		// Record imports and information about cgo.
		isCgo := false
		for _, decl := range pf.Decls {
			d, ok := decl.(*ast.GenDecl)
			if !ok {
				continue
			}
			for _, dspec := range d.Specs {
				spec, ok := dspec.(*ast.ImportSpec)
				if !ok {
					continue
				}
				quoted := spec.Path.Value
				path, err := strconv.Unquote(quoted)
				if err != nil {
					log.Panicf("%s: parser returned invalid quoted string: <%s>", filename, quoted)
				}
				if isXTest {
					xTestImported[path] = append(xTestImported[path], fset.Position(spec.Pos()))
				} else if isTest {
					testImported[path] = append(testImported[path], fset.Position(spec.Pos()))
				} else {
					imported[path] = append(imported[path], fset.Position(spec.Pos()))
				}
				if path == "C" {
					if isTest {
						return p, fmt.Errorf("use of cgo in test %s not supported", filename)
					}
					cg := spec.Doc
					if cg == nil && len(d.Specs) == 1 {
						cg = d.Doc
					}
					if cg != nil {
						if err := ctxt.saveCgo(filename, p, cg); err != nil {
							return p, err
						}
					}
					isCgo = true
				}
			}
		}
		if isCgo {
			allTags["cgo"] = true
			if ctxt.CgoEnabled {
				p.CgoFiles = append(p.CgoFiles, name)
			} else {
				p.IgnoredGoFiles = append(p.IgnoredGoFiles, name)
			}
		} else if isXTest {
			p.XTestGoFiles = append(p.XTestGoFiles, name)
		} else if isTest {
			p.TestGoFiles = append(p.TestGoFiles, name)
		} else {
			p.GoFiles = append(p.GoFiles, name)
		}
	}
	if len(p.GoFiles)+len(p.CgoFiles)+len(p.TestGoFiles)+len(p.XTestGoFiles) == 0 {
		return p, &NoGoError{p.Dir}
	}

	for tag := range allTags {
		p.AllTags = append(p.AllTags, tag)
	}
	sort.Strings(p.AllTags)

	p.Imports, p.ImportPos = cleanImports(imported)
	p.TestImports, p.TestImportPos = cleanImports(testImported)
	p.XTestImports, p.XTestImportPos = cleanImports(xTestImported)

	// add the .S files only if we are using cgo
	// (which means gcc will compile them).
	// The standard assemblers expect .s files.
	if len(p.CgoFiles) > 0 {
		p.SFiles = append(p.SFiles, Sfiles...)
		sort.Strings(p.SFiles)
	}

	return p, pkgerr
}
Ejemplo n.º 25
0
	"github.com/jchauncey/kubeclient/third_party/golang/go/parser"
	"github.com/jchauncey/kubeclient/third_party/golang/go/token"
	"io/ioutil"
	"path/filepath"
	"testing"
	"time"
)

const (
	dataDir  = "testdata"
	tabwidth = 8
)

var update = flag.Bool("update", false, "update golden files")

var fset = token.NewFileSet()

type checkMode uint

const (
	export checkMode = 1 << iota
	rawFormat
	idempotent
)

// format parses src, prints the corresponding AST, verifies the resulting
// src is syntactically correct, and returns the resulting src or an error
// if any.
func format(src []byte, mode checkMode) ([]byte, error) {
	// parse src
	f, err := parser.ParseFile(fset, "", src, parser.ParseComments)