How to use Lookup method of types Package

Best Ginkgo code snippet using types.Lookup

importer.go

Source:importer.go

...12	"go/types"13	"io"14	"runtime"15)16// A Lookup function returns a reader to access package data for17// a given import path, or an error if no matching package is found.18type Lookup func(path string) (io.ReadCloser, error)19// ForCompiler returns an Importer for importing from installed packages20// for the compilers "gc" and "gccgo", or for importing directly21// from the source if the compiler argument is "source". In this22// latter case, importing may fail under circumstances where the23// exported API is not entirely defined in pure Go source code24// (if the package API depends on cgo-defined entities, the type25// checker won't have access to those).26//27// The lookup function is called each time the resulting importer needs28// to resolve an import path. In this mode the importer can only be29// invoked with canonical import paths (not relative or absolute ones);30// it is assumed that the translation to canonical import paths is being31// done by the client of the importer.32//33// A lookup function must be provided for correct module-aware operation.34// Deprecated: If lookup is nil, for backwards-compatibility, the importer35// will attempt to resolve imports in the $GOPATH workspace.36func ForCompiler(fset *token.FileSet, compiler string, lookup Lookup) types.Importer {37	switch compiler {38	case "gc":39		return &gcimports{40			fset:     fset,41			packages: make(map[string]*types.Package),42			lookup:   lookup,43		}44	case "gccgo":45		var inst gccgoimporter.GccgoInstallation46		if err := inst.InitFromDriver("gccgo"); err != nil {47			return nil48		}49		return &gccgoimports{50			packages: make(map[string]*types.Package),51			importer: inst.GetImporter(nil, nil),52			lookup:   lookup,53		}54	case "source":55		if lookup != nil {56			panic("source importer for custom import path lookup not supported (issue #13847).")57		}58		return srcimporter.New(&build.Default, fset, make(map[string]*types.Package))59	}60	// compiler not supported61	return nil62}63// For calls ForCompiler with a new FileSet.64//65// Deprecated: Use ForCompiler, which populates a FileSet66// with the positions of objects created by the importer.67func For(compiler string, lookup Lookup) types.Importer {68	return ForCompiler(token.NewFileSet(), compiler, lookup)69}70// Default returns an Importer for the compiler that built the running binary.71// If available, the result implements types.ImporterFrom.72func Default() types.Importer {73	return For(runtime.Compiler, nil)74}75// gc importer76type gcimports struct {77	fset     *token.FileSet78	packages map[string]*types.Package79	lookup   Lookup80}81func (m *gcimports) Import(path string) (*types.Package, error) {82	return m.ImportFrom(path, "" /* no vendoring */, 0)83}84func (m *gcimports) ImportFrom(path, srcDir string, mode types.ImportMode) (*types.Package, error) {85	if mode != 0 {86		panic("mode must be 0")87	}88	return gcimporter.Import(m.fset, m.packages, path, srcDir, m.lookup)89}90// gccgo importer91type gccgoimports struct {92	packages map[string]*types.Package93	importer gccgoimporter.Importer94	lookup   Lookup95}96func (m *gccgoimports) Import(path string) (*types.Package, error) {97	return m.ImportFrom(path, "" /* no vendoring */, 0)98}99func (m *gccgoimports) ImportFrom(path, srcDir string, mode types.ImportMode) (*types.Package, error) {100	if mode != 0 {101		panic("mode must be 0")102	}103	return m.importer(m.packages, path, srcDir, m.lookup)104}...

sym_test.go

Source:sym_test.go

...16		xyz   = types.NewPkg("xyz", "")17		gr    = types.NewPkg("gr", "")18	)19	data := []*types.Sym{20		abc.Lookup("b"),21		local.Lookup("B"),22		local.Lookup("C"),23		uvw.Lookup("c"),24		local.Lookup("C"),25		gr.Lookup("Ï"),26		local.Lookup("Î¦"),27		xyz.Lookup("b"),28		abc.Lookup("a"),29		local.Lookup("B"),30	}31	want := []*types.Sym{32		local.Lookup("B"),33		local.Lookup("B"),34		local.Lookup("C"),35		local.Lookup("C"),36		local.Lookup("Î¦"),37		abc.Lookup("a"),38		abc.Lookup("b"),39		xyz.Lookup("b"),40		uvw.Lookup("c"),41		gr.Lookup("Ï"),42	}43	if len(data) != len(want) {44		t.Fatal("want and data must match")45	}46	if reflect.DeepEqual(data, want) {47		t.Fatal("data must be shuffled")48	}49	sort.Slice(data, func(i, j int) bool { return data[i].Less(data[j]) })50	if !reflect.DeepEqual(data, want) {51		t.Logf("want: %#v", want)52		t.Logf("data: %#v", data)53		t.Errorf("sorting failed")54	}55}...

Lookup

Using AI Code Generation

1import (2func main() {3    fmt.Println("type:", reflect.TypeOf(x))4    v := reflect.ValueOf(x)5    fmt.Println("value:", v)6    fmt.Println("kind is float64:", v.Kind() == reflect.Float64)7    fmt.Println("value:", v.Float())8    fmt.Println(v.Interface())9    fmt.Println(y)10}11import (12func main() {13    t := reflect.TypeOf(3)14    v := reflect.New(t)15    fmt.Println(v)16}17import (18func main() {19    fmt.Println("type:", reflect.TypeOf(x))20    v := reflect.ValueOf(x)21    fmt.Println("value:", v)22    fmt.Println("kind is float64:", v.Kind() == reflect.Float64)23    fmt.Println("value:", v.Float())24    fmt.Println(v.Interface())25    fmt.Println(y)26}

Lookup

Using AI Code Generation

1import (2func main() {3	v := reflect.ValueOf(x)4	fmt.Println("type:", v.Type())5	fmt.Println("kind is float64:", v.Kind() == reflect.Float64)6	fmt.Println("value:", v.Float())7	fmt.Println("type of p:", p.Type())8	fmt.Println("settability of p:", p.CanSet())9	v = p.Elem()10	fmt.Println("settability of v:", v.CanSet())11	v.SetFloat(7.1)12	fmt.Println(v.Interface())13	fmt.Println(x)14}15import (16func main() {17	fmt.Println("type:", reflect.TypeOf(x))18}19import (20func main() {21	t := reflect.New(reflect.TypeOf(time.Time{})).Interface().(time.Time)22	fmt.Println(t)23}

Lookup

Using AI Code Generation

1import (2type T struct {3}4func (t T) String() string {5	return fmt.Sprintf("A is %d and B is %s", t.A, t.B)6}7func main() {8	t := T{23, "skidoo"}9	s := reflect.ValueOf(&t).Elem()10	typeOfT := s.Type()11	for i := 0; i < s.NumField(); i++ {12		f := s.Field(i)13		fmt.Printf("%d: %s %s = %v14			typeOfT.Field(i).Name, f.Type(), f.Interface())15	}16	f := s.FieldByName("B")17	if f.IsValid() {18		fmt.Println("B is valid")19	}20	f.SetString("Sunset Strip")21	fmt.Println("t is now", t)22}23import (24type T struct {25}26func (t T) String() string {27	return fmt.Sprintf("A is %d and B is %s", t.A, t.B)28}29func main() {30	t := T{23, "skidoo"}31	s := reflect.ValueOf(&t).Elem()32	typeOfT := s.Type()33	for i := 0; i < s.NumField(); i++ {34		f := s.Field(i)35		fmt.Printf("%d: %s %s = %v36			typeOfT.Field(i).Name, f.Type(), f.Interface())37	}38	f := s.FieldByName("B")39	if f.IsValid() {40		fmt.Println("B is valid")41	}42	f.SetString("Sunset Strip")43	fmt.Println("t is now", t)44}45import

Lookup

Using AI Code Generation

1import (2func main() {3    addrs, _ := net.LookupHost("google.com")4    for _, addr := range addrs {5        fmt.Println(addr)6    }7}

Lookup

Using AI Code Generation

1import (2func main() {3	fmt.Println("Type of num is", reflect.TypeOf(num))4	fmt.Println("Value of num is", reflect.ValueOf(num))5	fmt.Println("Kind of num is", reflect.ValueOf(num).Kind())6	fmt.Println("Type of num is", reflect.ValueOf(num).Type())7	fmt.Println("Value of num is", reflect.ValueOf(num).Int())8}9import (10type Employee struct {11}12func main() {13	t := reflect.TypeOf(emp)14	fmt.Println("Type is:", t.Name())15	fmt.Println("Kind is:", t.Kind())16	for i := 0; i < t.NumField(); i++ {17		f := t.Field(i)18		fmt.Println("Name:", f.Name, "Type:", f.Type, "Tag:", f.Tag)19	}20}21import (22type Employee struct {23}24func (e Employee) DisplaySalary() {25	fmt.Println("Salary is", e.Salary)26}27func main() {28	t := reflect.TypeOf(emp)29	for i := 0; i < t.NumMethod(); i++ {30		m := t.Method(i)31		fmt.Println("Name:", m.Name, "Type:", m.Type)32	}33}34Name: DisplaySalary Type: func(main.Employee)35import (

Lookup

Using AI Code Generation

1import (2func main() {3    var t reflect.Type = reflect.TypeOf(s)4    fmt.Println(t)5    var f reflect.StructField = t.FieldByName("Len")6    fmt.Println(f)7}8{ Len 0 [0] 0 false}9import (10func main() {11    var t reflect.Type = reflect.TypeOf(s)12    fmt.Println(t)13    var f reflect.StructField = t.FieldByIndex([]int{1})14    fmt.Println(f)15}16{ len 1 [0] 0 false}17import (18func main() {19    var t reflect.Type = reflect.TypeOf(s)20    fmt.Println(t)21    var f []reflect.StructField = t.Lookup("Len")22    fmt.Println(f)23}24import (25func main() {26    var t reflect.Type = reflect.TypeOf(s)

Lookup

Using AI Code Generation

1import (2func main() {3    s := struct {4    }{"John", 23}5    t := reflect.TypeOf(s)6    f := t.Field(0)7    fmt.Println(f.Name)8    fmt.Println(f.Type)9    fmt.Println(f.Tag)10    f = t.Field(1)11    fmt.Println(f.Name)12    fmt.Println(f.Type)13    fmt.Println(f.Tag)14}15import (16func main() {17    s := struct {18    }{"John", 23}19    t := reflect.TypeOf(s)20    f, _ := t.FieldByName("Name")21    fmt.Println(f.Name)22    fmt.Println(f.Type)23    fmt.Println(f.Tag)24    f, _ = t.FieldByName("Age")25    fmt.Println(f.Name)26    fmt.Println(f.Type)27    fmt.Println(f.Tag)28}29import (30func main() {31    s := struct {32    }{"John", 23}33    t := reflect.TypeOf(s)34    f, _ := t.FieldByName("Name")

Lookup

Using AI Code Generation

1import (2func main() {3	var h [3]int = [3]int{1, 2, 3}4	var i []int = []int{1, 2, 3}5	var j map[string]int = map[string]int{"one": 1, "two": 2}6	var k struct {7	} = struct {8	}{x: 10, y: 20}9	var l chan int = make(chan int)10	var m func() int = func() int { return 10 }11	fmt.Println(reflect.TypeOf(a).Kind())12	fmt.Println(reflect.TypeOf(b).Kind())13	fmt.Println(reflect.TypeOf(c).Kind())14	fmt.Println(reflect.TypeOf(d).Kind())15	fmt.Println(reflect.TypeOf(e).Kind())16	fmt.Println(reflect.TypeOf(f).Kind())17	fmt.Println(reflect.TypeOf(g).Kind())18	fmt.Println(reflect.TypeOf(h).Kind())19	fmt.Println(reflect.TypeOf(i).Kind())20	fmt.Println(reflect.TypeOf(j).Kind())21	fmt.Println(reflect.TypeOf(k).Kind())22	fmt.Println(reflect.TypeOf(l).Kind())23	fmt.Println(reflect.TypeOf(m).Kind())24}

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