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How to use getCaster method of td Package

Best Go-testdeep code snippet using td.getCaster

td_smuggle.go

Source:td_smuggle.go

...255	vfn := reflect.ValueOf(fn)256	smuggleFns[fieldPath] = vfn257	return vfn, err258}259func getCaster(outType reflect.Type) reflect.Value {260	smuggleFnsMu.Lock()261	defer smuggleFnsMu.Unlock()262	if vfn, ok := smuggleFns[outType]; ok {263		return vfn264	}265	var fn reflect.Value266	switch outType.Kind() {267	case reflect.String:268		fn = buildCaster(outType, true)269	case reflect.Slice:270		if outType.Elem().Kind() == reflect.Uint8 {271			// Special case for slices of bytes: falls back on io.Reader if not []byte272			fn = buildCaster(outType, false)273			break274		}275		fallthrough276	default:277		// For all other types, take the received param and return278		// it. Smuggle already converted got to the type of param, so the279		// work is done.280		inOut := []reflect.Type{outType}281		fn = reflect.MakeFunc(282			reflect.FuncOf(inOut, inOut, false),283			func(args []reflect.Value) []reflect.Value { return args },284		)285	}286	smuggleFns[outType] = fn287	return fn288}289// buildCaster returns a function:290//291//	func(in any) (out outType, err error)292//293// dynamically checksâ¦294//   - if useString is false, as outType is a slice of bytes:295//     1. in is a []byte or convertible to []byte296//     2. in implements io.Reader297//   - if useString is true, as outType is a string:298//     1. in is a []byte or convertible to string299//     2. in implements io.Reader300func buildCaster(outType reflect.Type, useString bool) reflect.Value {301	zeroRet := reflect.New(outType).Elem()302	return reflect.MakeFunc(303		reflect.FuncOf(304			[]reflect.Type{types.Interface},305			[]reflect.Type{outType, types.Error},306			false,307		),308		func(args []reflect.Value) []reflect.Value {309			if args[0].IsNil() {310				return []reflect.Value{311					zeroRet,312					reflect.ValueOf(&ctxerr.Error{313						Message:  "incompatible parameter type",314						Got:      types.RawString("nil"),315						Expected: types.RawString(outType.String() + " or convertible or io.Reader"),316					}),317				}318			}319			// 1st & only arg is always an interface320			args[0] = args[0].Elem()321			if ok, convertible := types.IsTypeOrConvertible(args[0], outType); ok {322				if convertible {323					return []reflect.Value{args[0].Convert(outType), nilError}324				}325				return []reflect.Value{args[0], nilError}326			}327			// Our caller encures Interface() can be called safely328			switch ta := args[0].Interface().(type) {329			case io.Reader:330				var b bytes.Buffer331				if _, err := b.ReadFrom(ta); err != nil {332					return []reflect.Value{333						zeroRet,334						reflect.ValueOf(&ctxerr.Error{335							Message: "an error occurred while reading from io.Reader",336							Summary: ctxerr.NewSummary(err.Error()),337						}),338					}339				}340				var buf any341				if useString {342					buf = b.String()343				} else {344					buf = b.Bytes()345				}346				return []reflect.Value{347					reflect.ValueOf(buf).Convert(outType),348					nilError,349				}350			default:351				return []reflect.Value{352					zeroRet,353					reflect.ValueOf(&ctxerr.Error{354						Message:  "incompatible parameter type",355						Got:      types.RawString(args[0].Type().String()),356						Expected: types.RawString(outType.String() + " or convertible or io.Reader"),357					}),358				}359			}360		})361}362// summary(Smuggle): changes data contents or mutates it into another363// type via a custom function or a struct fields-path before stepping364// down in favor of generic comparison process365// input(Smuggle): all366// Smuggle operator allows to change data contents or mutate it into367// another type before stepping down in favor of generic comparison368// process. Of course it is a smuggler operator. So fn is a function369// that must take one parameter whose type must be convertible to the370// type of the compared value.371//372// As convenient shortcuts, fn can be a string specifying a373// fields-path through structs, maps & slices, or any other type, in374// this case a simple cast is done (see below for details).375//376// fn must return at least one value. These value will be compared as is377// to expectedValue, here integer 28:378//379//	td.Cmp(t, "0028",380//	  td.Smuggle(func(value string) int {381//	    num, _ := strconv.Atoi(value)382//	    return num383//	  }, 28),384//	)385//386// or using an other [TestDeep] operator, here [Between](28, 30):387//388//	td.Cmp(t, "0029",389//	  td.Smuggle(func(value string) int {390//	    num, _ := strconv.Atoi(value)391//	    return num392//	  }, td.Between(28, 30)),393//	)394//395// fn can return a second boolean value, used to tell that a problem396// occurred and so stop the comparison:397//398//	td.Cmp(t, "0029",399//	  td.Smuggle(func(value string) (int, bool) {400//	    num, err := strconv.Atoi(value)401//	    return num, err == nil402//	  }, td.Between(28, 30)),403//	)404//405// fn can return a third string value which is used to describe the406// test when a problem occurred (false second boolean value):407//408//	td.Cmp(t, "0029",409//	  td.Smuggle(func(value string) (int, bool, string) {410//	    num, err := strconv.Atoi(value)411//	    if err != nil {412//	      return 0, false, "string must contain a number"413//	    }414//	    return num, true, ""415//	  }, td.Between(28, 30)),416//	)417//418// Instead of returning (X, bool) or (X, bool, string), fn can419// return (X, error). When a problem occurs, the returned error is420// non-nil, as in:421//422//	td.Cmp(t, "0029",423//	  td.Smuggle(func(value string) (int, error) {424//	    num, err := strconv.Atoi(value)425//	    return num, err426//	  }, td.Between(28, 30)),427//	)428//429// Which can be simplified to:430//431//	td.Cmp(t, "0029", td.Smuggle(strconv.Atoi, td.Between(28, 30)))432//433// Imagine you want to compare that the Year of a date is between 2010434// and 2020:435//436//	td.Cmp(t, time.Date(2015, time.May, 1, 1, 2, 3, 0, time.UTC),437//	  td.Smuggle(func(date time.Time) int { return date.Year() },438//	    td.Between(2010, 2020)),439//	)440//441// In this case the data location forwarded to next test will be442// something like "DATA.MyTimeField<smuggled>", but you can act on it443// too by returning a [SmuggledGot] struct (by value or by address):444//445//	td.Cmp(t, time.Date(2015, time.May, 1, 1, 2, 3, 0, time.UTC),446//	  td.Smuggle(func(date time.Time) SmuggledGot {447//	    return SmuggledGot{448//	      Name: "Year",449//	      Got:  date.Year(),450//	    }451//	  }, td.Between(2010, 2020)),452//	)453//454// then the data location forwarded to next test will be something like455// "DATA.MyTimeField.Year". The "." between the current path (here456// "DATA.MyTimeField") and the returned Name "Year" is automatically457// added when Name starts with a Letter.458//459// Note that [SmuggledGot] and [*SmuggledGot] returns are treated460// equally, and they are only used when fn has only one returned value461// or when the second boolean returned value is true.462//463// Of course, all cases can go together:464//465//	// Accepts a "YYYY/mm/DD HH:MM:SS" string to produce a time.Time and tests466//	// whether this date is contained between 2 hours before now and now.467//	td.Cmp(t, "2020-01-25 12:13:14",468//	  td.Smuggle(func(date string) (*SmuggledGot, bool, string) {469//	    date, err := time.Parse("2006/01/02 15:04:05", date)470//	    if err != nil {471//	      return nil, false, `date must conform to "YYYY/mm/DD HH:MM:SS" format`472//	    }473//	    return &SmuggledGot{474//	      Name: "Date",475//	      Got:  date,476//	    }, true, ""477//	  }, td.Between(time.Now().Add(-2*time.Hour), time.Now())),478//	)479//480// or:481//482//	// Accepts a "YYYY/mm/DD HH:MM:SS" string to produce a time.Time and tests483//	// whether this date is contained between 2 hours before now and now.484//	td.Cmp(t, "2020-01-25 12:13:14",485//	  td.Smuggle(func(date string) (*SmuggledGot, error) {486//	    date, err := time.Parse("2006/01/02 15:04:05", date)487//	    if err != nil {488//	      return nil, err489//	    }490//	    return &SmuggledGot{491//	      Name: "Date",492//	      Got:  date,493//	    }, nil494//	  }, td.Between(time.Now().Add(-2*time.Hour), time.Now())),495//	)496//497// Smuggle can also be used to access a struct field embedded in498// several struct layers.499//500//	type A struct{ Num int }501//	type B struct{ As map[string]*A }502//	type C struct{ B B }503//	got := C{B: B{As: map[string]*A{"foo": {Num: 12}}}}504//505//	// Tests that got.B.A.Num is 12506//	td.Cmp(t, got,507//	  td.Smuggle(func(c C) int {508//	    return c.B.As["foo"].Num509//	  }, 12))510//511// As brought up above, a fields-path can be passed as fn value512// instead of a function pointer. Using this feature, the [Cmp]513// call in the above example can be rewritten as follows:514//515//	// Tests that got.B.As["foo"].Num is 12516//	td.Cmp(t, got, td.Smuggle("B.As[foo].Num", 12))517//518// Contrary to [JSONPointer] operator, private fields can be519// followed. Arrays, slices and maps work using the index/key inside520// square brackets (e.g. [12] or [foo]). Maps work only for simple key521// types (string or numbers), without "" when using strings522// (e.g. [foo]).523//524// Behind the scenes, a temporary function is automatically created to525// achieve the same goal, but add some checks against nil values and526// auto-dereference interfaces and pointers, even on several levels,527// like in:528//529//	type A struct{ N any }530//	num := 12531//	pnum := &num532//	td.Cmp(t, A{N: &pnum}, td.Smuggle("N", 12))533//534// Last but not least, a simple type can be passed as fn to operate535// a cast, handling specifically strings and slices of bytes:536//537//	td.Cmp(t, `{"foo":1}`, td.Smuggle(json.RawMessage{}, td.JSON(`{"foo":1}`)))538//	// or equally539//	td.Cmp(t, `{"foo":1}`, td.Smuggle(json.RawMessage(nil), td.JSON(`{"foo":1}`)))540//541// converts on the fly a string to a [json.RawMessage] so [JSON] operator542// can parse it as JSON. This is mostly a shortcut for:543//544//	td.Cmp(t, `{"foo":1}`, td.Smuggle(545//	  func(r json.RawMessage) json.RawMessage { return r },546//	  td.JSON(`{"foo":1}`)))547//548// except that for strings and slices of bytes (like here), it accepts549// [io.Reader] interface too:550//551//	var body io.Reader552//	// â¦553//	td.Cmp(t, body, td.Smuggle(json.RawMessage{}, td.JSON(`{"foo":1}`)))554//	// or equally555//	td.Cmp(t, body, td.Smuggle(json.RawMessage(nil), td.JSON(`{"foo":1}`)))556//557// This last example allows to easily inject body content into JSON558// operator.559//560// The difference between Smuggle and [Code] operators is that [Code]561// is used to do a final comparison while Smuggle transforms the data562// and then steps down in favor of generic comparison563// process. Moreover, the type accepted as input for the function is564// more lax to facilitate the writing of tests (e.g. the function can565// accept a float64 and the got value be an int). See examples. On the566// other hand, the output type is strict and must match exactly the567// expected value type. The fields-path string fn shortcut and the568// cast feature are not available with [Code] operator.569//570// TypeBehind method returns the [reflect.Type] of only parameter of571// fn. For the case where fn is a fields-path, it is always572// any, as the type can not be known in advance.573//574// See also [Code] and [JSONPointer].575//576// [json.RawMessage]: https://pkg.go.dev/encoding/json#RawMessage577func Smuggle(fn, expectedValue any) TestDeep {578	s := tdSmuggle{579		tdSmugglerBase: newSmugglerBase(expectedValue),580	}581	const usage = "(FUNC|FIELDS_PATH|ANY_TYPE, TESTDEEP_OPERATOR|EXPECTED_VALUE)"582	const fullUsage = "Smuggle" + usage583	var vfn reflect.Value584	switch rfn := fn.(type) {585	case reflect.Type:586		switch rfn.Kind() {587		case reflect.Func, reflect.Invalid, reflect.Interface:588			s.err = ctxerr.OpBad("Smuggle",589				"usage: Smuggle%s, ANY_TYPE reflect.Type cannot be Func nor Interface", usage)590			return &s591		default:592			vfn = getCaster(rfn)593		}594	case string:595		if rfn == "" {596			vfn = getCaster(reflect.TypeOf(fn))597			break598		}599		var err error600		vfn, err = getFieldsPathFn(rfn)601		if err != nil {602			s.err = ctxerr.OpBad("Smuggle", "Smuggle%s: %s", usage, err)603			return &s604		}605	default:606		vfn = reflect.ValueOf(fn)607		switch vfn.Kind() {608		case reflect.Func:609			// nothing to check610		case reflect.Invalid, reflect.Interface:611			s.err = ctxerr.OpBad("Smuggle",612				"usage: Smuggle%s, ANY_TYPE cannot be nil nor Interface", usage)613			return &s614		default:615			vfn = getCaster(vfn.Type())616		}617	}618	fnType := vfn.Type()619	if fnType.IsVariadic() || fnType.NumIn() != 1 {620		s.err = ctxerr.OpBad("Smuggle", fullUsage+": FUNC must take only one non-variadic argument")621		return &s622	}623	switch fnType.NumOut() {624	case 3: // (value, bool, string)625		if fnType.Out(2).Kind() != reflect.String {626			break627		}628		fallthrough629	case 2:...

getCaster

Using AI Code Generation

1import "fmt"2func main() {3    fmt.Println(td.getCaster())4}5import "fmt"6func main() {7    fmt.Println(td.getTarget())8}9import "fmt"10func main() {11    fmt.Println(td.getSpell())12}13import "fmt"14func main() {15    fmt.Println(td.getDamage())16}17import "fmt"18func main() {19    fmt.Println(td.getDamageType())20}21import "fmt"22func main() {23    fmt.Println(td.getHitType())24}25import "fmt"26func main() {27    fmt.Println(td.getHitLocation())28}29import "fmt"30func main() {31    fmt.Println(td.getHitDamage())32}33import "fmt"34func main() {35    fmt.Println(td.getHitDamageType())36}37import "fmt"38func main() {39    fmt.Println(td.getHitDamageLocation())40}41import "fmt"42func main() {43    fmt.Println(td.getHitDamageLocation())44}45import "fmt"46func main() {47    fmt.Println(td.getHitDamageLocation())48}49import "fmt"50func main() {51    fmt.Println(td.getHitDamageLocation())52}

getCaster

Using AI Code Generation

1import (2type td struct {3}4func (t *td) getCaster() string {5}6func main() {7	t := td{}8	fmt.Println(t.getCaster())9}10import (11type td struct {12}13func (t *td) getCaster() string {14}15func main() {16	t := &td{}17	fmt.Println(t.getCaster())18}19import (20type td struct {21}22func (t td) getCaster() string {23}24func main() {25	t := &td{}26	fmt.Println(t.getCaster())27}28import (29type td struct {30}31func (t *td) getCaster() string {32}33func main() {34	t := &td{}35	fmt.Println(t.getCaster())36}

getCaster

Using AI Code Generation

1import "fmt"2func main() {3    t.setCaster("James")4    fmt.Println(t.getCaster())5}6import "fmt"7func main() {8    t.setCaster("James")9    fmt.Println(t.getCaster())10}11import "fmt"12func main() {13    t.setCaster("James")14    fmt.Println(t.getCaster())15}16import "fmt"17func main() {18    t.setCaster("James")19    fmt.Println(t.getCaster())20}21import "fmt"22func main() {23    t.setCaster("James")24    fmt.Println(t.getCaster())25}26import "fmt"27func main() {28    t.setCaster("James")29    fmt.Println(t.getCaster())30}31import "fmt"32func main() {33    t.setCaster("James")34    fmt.Println(t.getCaster())35}36import "fmt"37func main() {38    t.setCaster("James")39    fmt.Println(t.getCaster())40}41import "fmt"42func main() {43    t.setCaster("James")44    fmt.Println(t.getCaster())45}46import "fmt"47func main() {48    t.setCaster("James")49    fmt.Println(t.getCaster())50}

getCaster

Using AI Code Generation

1import (2func main() {3    fmt.Println(golenv.GetCaster("GOPATH"))4}5import (6func main() {7    fmt.Println(golenv.GetCaster("GOPATH"))8}9import (10func main() {11    fmt.Println(golenv.GetCaster("GOPATH"))12}

getCaster

Using AI Code Generation

1import "fmt"2func main() {3    var x interface{}4    fmt.Println(x)5    fmt.Printf("Type of x is %T6    fmt.Println(x)7    fmt.Printf("Type of x is %T8    fmt.Println(x)9    fmt.Printf("Type of x is %T10}

getCaster

Using AI Code Generation

1type TowerDefense struct {2}3type Caster struct {4}5func getCaster() Caster {6    return Caster{7    }8}9I do not think this is the way to go. I am not sure what you are trying to do. If you want to use the getCaster() method of td package, you should call it like this:10import "td"11func main() {12    t.Caster = td.getCaster()13}14If you want to use the getCaster() method of the td.TowerDefense struct, you should call it like this:15import "td"16func main() {17    t.Caster = t.getCaster()18}19import "td"20func main() {21    t.Caster = td.Caster{22    }23}

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