Golang loader.Config类代码示例

func TestCwd(t *testing.T) {
	ctxt := fakeContext(map[string]string{"one/two/three": `package three`})
	for _, test := range []struct {
		cwd, arg, want string
	}{
		{cwd: "/go/src/one", arg: "./two/three", want: "one/two/three"},
		{cwd: "/go/src/one", arg: "../one/two/three", want: "one/two/three"},
		{cwd: "/go/src/one", arg: "one/two/three", want: "one/two/three"},
		{cwd: "/go/src/one/two/three", arg: ".", want: "one/two/three"},
		{cwd: "/go/src/one", arg: "two/three", want: ""},
	} {
		conf := loader.Config{
			Cwd:   test.cwd,
			Build: ctxt,
		}
		conf.Import(test.arg)

		var got string
		prog, err := conf.Load()
		if prog != nil {
			got = imported(prog)
		}
		if got != test.want {
			t.Errorf("Load(%s) from %s: Imported = %s, want %s",
				test.arg, test.cwd, got, test.want)
			if err != nil {
				t.Errorf("Load failed: %v", err)
			}
		}
	}
}

func TestTransitivelyErrorFreeFlag(t *testing.T) {
	// Create an minimal custom build.Context
	// that fakes the following packages:
	//
	// a --> b --> c!   c has an error
	//   \              d and e are transitively error-free.
	//    e --> d
	//
	// Each package [a-e] consists of one file, x.go.
	pkgs := map[string]string{
		"a": `package a; import (_ "b"; _ "e")`,
		"b": `package b; import _ "c"`,
		"c": `package c; func f() { _ = int(false) }`, // type error within function body
		"d": `package d;`,
		"e": `package e; import _ "d"`,
	}
	conf := loader.Config{
		AllowErrors: true,
		Build:       fakeContext(pkgs),
	}
	conf.Import("a")

	prog, err := conf.Load()
	if err != nil {
		t.Errorf("Load failed: %s", err)
	}
	if prog == nil {
		t.Fatalf("Load returned nil *Program")
	}

	for pkg, info := range prog.AllPackages {
		var wantErr, wantTEF bool
		switch pkg.Path() {
		case "a", "b":
		case "c":
			wantErr = true
		case "d", "e":
			wantTEF = true
		default:
			t.Errorf("unexpected package: %q", pkg.Path())
			continue
		}

		if (info.Errors != nil) != wantErr {
			if wantErr {
				t.Errorf("Package %q.Error = nil, want error", pkg.Path())
			} else {
				t.Errorf("Package %q has unexpected Errors: %v",
					pkg.Path(), info.Errors)
			}
		}

		if info.TransitivelyErrorFree != wantTEF {
			t.Errorf("Package %q.TransitivelyErrorFree=%t, want %t",
				pkg.Path(), info.TransitivelyErrorFree, wantTEF)
		}
	}
}

func TestLoad_BadDependency_AllowErrors(t *testing.T) {
	for _, test := range []struct {
		descr    string
		pkgs     map[string]string
		wantPkgs string
	}{

		{
			descr: "missing dependency",
			pkgs: map[string]string{
				"a": `package a; import _ "b"`,
				"b": `package b; import _ "c"`,
			},
			wantPkgs: "a b",
		},
		{
			descr: "bad package decl in dependency",
			pkgs: map[string]string{
				"a": `package a; import _ "b"`,
				"b": `package b; import _ "c"`,
				"c": `package`,
			},
			wantPkgs: "a b",
		},
		{
			descr: "parse error in dependency",
			pkgs: map[string]string{
				"a": `package a; import _ "b"`,
				"b": `package b; import _ "c"`,
				"c": `package c; var x = `,
			},
			wantPkgs: "a b c",
		},
	} {
		conf := loader.Config{
			AllowErrors: true,
			Build:       fakeContext(test.pkgs),
		}
		conf.Import("a")

		prog, err := conf.Load()
		if err != nil {
			t.Errorf("%s: Load failed unexpectedly: %v", test.descr, err)
		}
		if prog == nil {
			t.Fatalf("%s: Load returned a nil Program", test.descr)
		}

		if got, want := imported(prog), "a"; got != want {
			t.Errorf("%s: Imported = %s, want %s", test.descr, got, want)
		}
		if got := all(prog); strings.Join(got, " ") != test.wantPkgs {
			t.Errorf("%s: AllPackages = %s, want %s", test.descr, got, test.wantPkgs)
		}
	}
}

func TestCreateUnnamedPackage(t *testing.T) {
	var conf loader.Config
	conf.CreateFromFilenames("")
	prog, err := conf.Load()
	if err != nil {
		t.Fatalf("Load failed: %v", err)
	}
	if got, want := fmt.Sprint(prog.InitialPackages()), "[(unnamed)]"; got != want {
		t.Errorf("InitialPackages = %s, want %s", got, want)
	}
}

func TestLoad_MissingFileInCreatedPackage_AllowErrors(t *testing.T) {
	conf := loader.Config{AllowErrors: true}
	conf.CreateFromFilenames("", "missing.go")

	prog, err := conf.Load()
	if err != nil {
		t.Errorf("Load failed: %v", err)
	}
	if got, want := fmt.Sprint(prog.InitialPackages()), "[(unnamed)]"; got != want {
		t.Fatalf("InitialPackages = %s, want %s", got, want)
	}
}

// Test that syntax (scan/parse), type, and loader errors are recorded
// (in PackageInfo.Errors) and reported (via Config.TypeChecker.Error).
func TestErrorReporting(t *testing.T) {
	pkgs := map[string]string{
		"a": `package a; import (_ "b"; _ "c"); var x int = false`,
		"b": `package b; 'syntax error!`,
	}
	conf := loader.Config{
		AllowErrors: true,
		Build:       fakeContext(pkgs),
	}
	var mu sync.Mutex
	var allErrors []error
	conf.TypeChecker.Error = func(err error) {
		mu.Lock()
		allErrors = append(allErrors, err)
		mu.Unlock()
	}
	conf.Import("a")

	prog, err := conf.Load()
	if err != nil {
		t.Errorf("Load failed: %s", err)
	}
	if prog == nil {
		t.Fatalf("Load returned nil *Program")
	}

	// TODO(adonovan): test keys of ImportMap.

	// Check errors recorded in each PackageInfo.
	for pkg, info := range prog.AllPackages {
		switch pkg.Path() {
		case "a":
			if !hasError(info.Errors, "cannot convert false") {
				t.Errorf("a.Errors = %v, want bool conversion (type) error", info.Errors)
			}
			if !hasError(info.Errors, "could not import c") {
				t.Errorf("a.Errors = %v, want import (loader) error", info.Errors)
			}
		case "b":
			if !hasError(info.Errors, "rune literal not terminated") {
				t.Errorf("b.Errors = %v, want unterminated literal (syntax) error", info.Errors)
			}
		}
	}

	// Check errors reported via error handler.
	if !hasError(allErrors, "cannot convert false") ||
		!hasError(allErrors, "rune literal not terminated") ||
		!hasError(allErrors, "could not import c") {
		t.Errorf("allErrors = %v, want syntax, type and loader errors", allErrors)
	}
}

func TestLoad_FromSource_Success(t *testing.T) {
	var conf loader.Config
	conf.CreateFromFilenames("P", "testdata/a.go", "testdata/b.go")

	prog, err := conf.Load()
	if err != nil {
		t.Errorf("Load failed unexpectedly: %v", err)
	}
	if prog == nil {
		t.Fatalf("Load returned a nil Program")
	}
	if got, want := created(prog), "P"; got != want {
		t.Errorf("Created = %s, want %s", got, want)
	}
}

func TestLoad_NoInitialPackages(t *testing.T) {
	var conf loader.Config

	const wantErr = "no initial packages were loaded"

	prog, err := conf.Load()
	if err == nil {
		t.Errorf("Load succeeded unexpectedly, want %q", wantErr)
	} else if err.Error() != wantErr {
		t.Errorf("Load failed with wrong error %q, want %q", err, wantErr)
	}
	if prog != nil {
		t.Errorf("Load unexpectedly returned a Program")
	}
}

// CreateTestMainPackage should return nil if there were no tests.
func TestNullTestmainPackage(t *testing.T) {
	var conf loader.Config
	conf.CreateFromFilenames("", "testdata/b_test.go")
	iprog, err := conf.Load()
	if err != nil {
		t.Fatalf("CreatePackages failed: %s", err)
	}
	prog := ssa.Create(iprog, ssa.SanityCheckFunctions)
	mainPkg := prog.Package(iprog.Created[0].Pkg)
	if mainPkg.Func("main") != nil {
		t.Fatalf("unexpected main function")
	}
	if prog.CreateTestMainPackage(mainPkg) != nil {
		t.Fatalf("CreateTestMainPackage returned non-nil")
	}
}

func TestLoad_ParseError(t *testing.T) {
	var conf loader.Config
	conf.CreateFromFilenames("badpkg", "testdata/badpkgdecl.go")

	const wantErr = "couldn't load packages due to errors: badpkg"

	prog, err := conf.Load()
	if prog != nil {
		t.Errorf("Load unexpectedly returned a Program")
	}
	if err == nil {
		t.Fatalf("Load succeeded unexpectedly, want %q", wantErr)
	}
	if err.Error() != wantErr {
		t.Fatalf("Load failed with wrong error %q, want %q", err, wantErr)
	}
}

func TestLoad_MissingFileInCreatedPackage(t *testing.T) {
	var conf loader.Config
	conf.CreateFromFilenames("", "missing.go")

	const wantErr = "couldn't load packages due to errors: (unnamed)"

	prog, err := conf.Load()
	if prog != nil {
		t.Errorf("Load unexpectedly returned a Program")
	}
	if err == nil {
		t.Fatalf("Load succeeded unexpectedly, want %q", wantErr)
	}
	if err.Error() != wantErr {
		t.Fatalf("Load failed with wrong error %q, want %q", err, wantErr)
	}
}

func TestLoad_FromImports_Success(t *testing.T) {
	var conf loader.Config
	conf.ImportWithTests("fmt")
	conf.ImportWithTests("errors")

	prog, err := conf.Load()
	if err != nil {
		t.Errorf("Load failed unexpectedly: %v", err)
	}
	if prog == nil {
		t.Fatalf("Load returned a nil Program")
	}
	if got, want := created(prog), "errors_test fmt_test"; got != want {
		t.Errorf("Created = %q, want %s", got, want)
	}
	if got, want := imported(prog), "errors fmt"; got != want {
		t.Errorf("Imported = %s, want %s", got, want)
	}
	// Check set of transitive packages.
	// There are >30 and the set may grow over time, so only check a few.
	want := map[string]bool{
		"strings": true,
		"time":    true,
		"runtime": true,
		"testing": true,
		"unicode": true,
	}
	for _, path := range all(prog) {
		delete(want, path)
	}
	if len(want) > 0 {
		t.Errorf("AllPackages is missing these keys: %q", keys(want))
	}
}

func TestLoad_MissingIndirectImport(t *testing.T) {
	pkgs := map[string]string{
		"a": `package a; import _ "b"`,
		"b": `package b; import _ "c"`,
	}
	conf := loader.Config{Build: fakeContext(pkgs)}
	conf.Import("a")

	const wantErr = "couldn't load packages due to errors: b"

	prog, err := conf.Load()
	if err == nil {
		t.Errorf("Load succeeded unexpectedly, want %q", wantErr)
	} else if err.Error() != wantErr {
		t.Errorf("Load failed with wrong error %q, want %q", err, wantErr)
	}
	if prog != nil {
		t.Errorf("Load unexpectedly returned a Program")
	}
}

func TestLoad_ParseError_AllowErrors(t *testing.T) {
	var conf loader.Config
	conf.AllowErrors = true
	conf.CreateFromFilenames("badpkg", "testdata/badpkgdecl.go")

	prog, err := conf.Load()
	if err != nil {
		t.Errorf("Load failed unexpectedly: %v", err)
	}
	if prog == nil {
		t.Fatalf("Load returned a nil Program")
	}
	if got, want := created(prog), "badpkg"; got != want {
		t.Errorf("Created = %s, want %s", got, want)
	}

	badpkg := prog.Created[0]
	if len(badpkg.Files) != 1 {
		t.Errorf("badpkg has %d files, want 1", len(badpkg.Files))
	}
	wantErr := "testdata/badpkgdecl.go:1:34: expected 'package', found 'EOF'"
	if !hasError(badpkg.Errors, wantErr) {
		t.Errorf("badpkg.Errors = %v, want %s", badpkg.Errors, wantErr)
	}
}

func TestSwitches(t *testing.T) {
	conf := loader.Config{ParserMode: parser.ParseComments}
	f, err := conf.ParseFile("testdata/switches.go", nil)
	if err != nil {
		t.Error(err)
		return
	}

	conf.CreateFromFiles("main", f)
	iprog, err := conf.Load()
	if err != nil {
		t.Error(err)
		return
	}

	prog := ssa.Create(iprog, 0)
	mainPkg := prog.Package(iprog.Created[0].Pkg)
	mainPkg.Build()

	for _, mem := range mainPkg.Members {
		if fn, ok := mem.(*ssa.Function); ok {
			if fn.Synthetic != "" {
				continue // e.g. init()
			}
			// Each (multi-line) "switch" comment within
			// this function must match the printed form
			// of a ConstSwitch.
			var wantSwitches []string
			for _, c := range f.Comments {
				if fn.Syntax().Pos() <= c.Pos() && c.Pos() < fn.Syntax().End() {
					text := strings.TrimSpace(c.Text())
					if strings.HasPrefix(text, "switch ") {
						wantSwitches = append(wantSwitches, text)
					}
				}
			}

			switches := ssautil.Switches(fn)
			if len(switches) != len(wantSwitches) {
				t.Errorf("in %s, found %d switches, want %d", fn, len(switches), len(wantSwitches))
			}
			for i, sw := range switches {
				got := sw.String()
				if i >= len(wantSwitches) {
					continue
				}
				want := wantSwitches[i]
				if got != want {
					t.Errorf("in %s, found switch %d: got <<%s>>, want <<%s>>", fn, i, got, want)
				}
			}
		}
	}
}