How to use sliceTypeBehind method of td Package

Best Go-testdeep code snippet using td.sliceTypeBehind

td_grep.go

Source:td_grep.go Github

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...89 return nil90 }91 return g.internalTypeBehind()92}93// sliceTypeBehind is used by First & Last TypeBehind method.94func (g *tdGrepBase) sliceTypeBehind() reflect.Type {95 typ := g.TypeBehind()96 if typ == nil {97 return nil98 }99 return reflect.SliceOf(typ)100}101func (g *tdGrepBase) notFound(ctx ctxerr.Context, got reflect.Value) *ctxerr.Error {102 if ctx.BooleanError {103 return ctxerr.BooleanError104 }105 return ctx.CollectError(&ctxerr.Error{106 Message: "item not found",107 Got: got,108 Expected: types.RawString(g.String()),109 })110}111func grepResolvePtr(ctx ctxerr.Context, got *reflect.Value) *ctxerr.Error {112 if got.Kind() == reflect.Ptr {113 gotElem := got.Elem()114 if !gotElem.IsValid() {115 if ctx.BooleanError {116 return ctxerr.BooleanError117 }118 return ctx.CollectError(ctxerr.NilPointer(*got, "non-nil *slice OR *array"))119 }120 switch gotElem.Kind() {121 case reflect.Slice, reflect.Array:122 *got = gotElem123 }124 }125 return nil126}127func grepBadKind(ctx ctxerr.Context, got reflect.Value) *ctxerr.Error {128 if ctx.BooleanError {129 return ctxerr.BooleanError130 }131 return ctx.CollectError(ctxerr.BadKind(got, "slice OR array OR *slice OR *array"))132}133type tdGrep struct {134 tdGrepBase135}136var _ TestDeep = &tdGrep{}137// summary(Grep): reduces a slice or an array before comparing its content138// input(Grep): array,slice,ptr(ptr on array/slice)139// Grep is a smuggler operator. It takes an array, a slice or a140// pointer on array/slice. For each item it applies filter, a141// [TestDeep] operator or a function returning a bool, and produces a142// slice consisting of those items for which the filter matched and143// compares it to expectedValue. The filter matches when it is a:144// - [TestDeep] operator and it matches for the item;145// - function receiving the item and it returns true.146//147// expectedValue can be a [TestDeep] operator or a slice (but never an148// array nor a pointer on a slice/array nor any other kind).149//150// got := []int{-3, -2, -1, 0, 1, 2, 3}151// td.Cmp(t, got, td.Grep(td.Gt(0), []int{1, 2, 3})) // succeeds152// td.Cmp(t, got, td.Grep(153// func(x int) bool { return x%2 == 0 },154// []int{-2, 0, 2})) // succeeds155// td.Cmp(t, got, td.Grep(156// func(x int) bool { return x%2 == 0 },157// td.Set(0, 2, -2))) // succeeds158//159// If Grep receives a nil slice or a pointer on a nil slice, it always160// returns a nil slice:161//162// var got []int163// td.Cmp(t, got, td.Grep(td.Gt(0), ([]int)(nil))) // succeeds164// td.Cmp(t, got, td.Grep(td.Gt(0), td.Nil())) // succeeds165// td.Cmp(t, got, td.Grep(td.Gt(0), []int{})) // fails166//167// See also [First] and [Last].168func Grep(filter, expectedValue any) TestDeep {169 g := tdGrep{}170 g.initGrepBase(filter, expectedValue)171 if g.err == nil && !g.isTestDeeper && g.expectedValue.Kind() != reflect.Slice {172 g.err = ctxerr.OpBad("Grep",173 "usage: Grep%s, EXPECTED_VALUE must be a slice not a %s",174 grepUsage, types.KindType(g.expectedValue))175 }176 return &g177}178func (g *tdGrep) Match(ctx ctxerr.Context, got reflect.Value) *ctxerr.Error {179 if g.err != nil {180 return ctx.CollectError(g.err)181 }182 if rErr := grepResolvePtr(ctx, &got); rErr != nil {183 return rErr184 }185 switch got.Kind() {186 case reflect.Slice, reflect.Array:187 const grepped = "<grepped>"188 if got.Kind() == reflect.Slice && got.IsNil() {189 return deepValueEqual(190 ctx.AddCustomLevel(grepped),191 reflect.New(got.Type()).Elem(),192 g.expectedValue,193 )194 }195 l := got.Len()196 out := reflect.MakeSlice(reflect.SliceOf(got.Type().Elem()), 0, l)197 for idx := 0; idx < l; idx++ {198 item := got.Index(idx)199 ok, rErr := g.matchItem(ctx, idx, item)200 if rErr != nil {201 return rErr202 }203 if ok {204 out = reflect.Append(out, item)205 }206 }207 return deepValueEqual(ctx.AddCustomLevel(grepped), out, g.expectedValue)208 }209 return grepBadKind(ctx, got)210}211type tdFirst struct {212 tdGrepBase213}214var _ TestDeep = &tdFirst{}215// summary(First): find the first matching item of a slice or an array216// then compare its content217// input(First): array,slice,ptr(ptr on array/slice)218// First is a smuggler operator. It takes an array, a slice or a219// pointer on array/slice. For each item it applies filter, a220// [TestDeep] operator or a function returning a bool. It takes the221// first item for which the filter matched and compares it to222// expectedValue. The filter matches when it is a:223// - [TestDeep] operator and it matches for the item;224// - function receiving the item and it returns true.225//226// expectedValue can of course be a [TestDeep] operator.227//228// got := []int{-3, -2, -1, 0, 1, 2, 3}229// td.Cmp(t, got, td.First(td.Gt(0), 1)) // succeeds230// td.Cmp(t, got, td.First(func(x int) bool { return x%2 == 0 }, -2)) // succeeds231// td.Cmp(t, got, td.First(func(x int) bool { return x%2 == 0 }, td.Lt(0))) // succeeds232//233// If the input is empty (and/or nil for a slice), an "item not found"234// error is raised before comparing to expectedValue.235//236// var got []int237// td.Cmp(t, got, td.First(td.Gt(0), td.Gt(0))) // fails238// td.Cmp(t, []int{}, td.First(td.Gt(0), td.Gt(0))) // fails239// td.Cmp(t, [0]int{}, td.First(td.Gt(0), td.Gt(0))) // fails240//241// See also [Last] and [Grep].242func First(filter, expectedValue any) TestDeep {243 g := tdFirst{}244 g.initGrepBase(filter, expectedValue)245 return &g246}247func (g *tdFirst) Match(ctx ctxerr.Context, got reflect.Value) *ctxerr.Error {248 if g.err != nil {249 return ctx.CollectError(g.err)250 }251 if rErr := grepResolvePtr(ctx, &got); rErr != nil {252 return rErr253 }254 switch got.Kind() {255 case reflect.Slice, reflect.Array:256 for idx, l := 0, got.Len(); idx < l; idx++ {257 item := got.Index(idx)258 ok, rErr := g.matchItem(ctx, idx, item)259 if rErr != nil {260 return rErr261 }262 if ok {263 return deepValueEqual(264 ctx.AddCustomLevel(S("<first#%d>", idx)),265 item,266 g.expectedValue,267 )268 }269 }270 return g.notFound(ctx, got)271 }272 return grepBadKind(ctx, got)273}274func (g *tdFirst) TypeBehind() reflect.Type {275 return g.sliceTypeBehind()276}277type tdLast struct {278 tdGrepBase279}280var _ TestDeep = &tdLast{}281// summary(Last): find the last matching item of a slice or an array282// then compare its content283// input(Last): array,slice,ptr(ptr on array/slice)284// Last is a smuggler operator. It takes an array, a slice or a285// pointer on array/slice. For each item it applies filter, a286// [TestDeep] operator or a function returning a bool. It takes the287// last item for which the filter matched and compares it to288// expectedValue. The filter matches when it is a:289// - [TestDeep] operator and it matches for the item;290// - function receiving the item and it returns true.291//292// expectedValue can of course be a [TestDeep] operator.293//294// got := []int{-3, -2, -1, 0, 1, 2, 3}295// td.Cmp(t, got, td.Last(td.Lt(0), -1)) // succeeds296// td.Cmp(t, got, td.Last(func(x int) bool { return x%2 == 0 }, 2)) // succeeds297// td.Cmp(t, got, td.Last(func(x int) bool { return x%2 == 0 }, td.Gt(0))) // succeeds298//299// If the input is empty (and/or nil for a slice), an "item not found"300// error is raised before comparing to expectedValue.301//302// var got []int303// td.Cmp(t, got, td.Last(td.Gt(0), td.Gt(0))) // fails304// td.Cmp(t, []int{}, td.Last(td.Gt(0), td.Gt(0))) // fails305// td.Cmp(t, [0]int{}, td.Last(td.Gt(0), td.Gt(0))) // fails306//307// See also [First] and [Grep].308func Last(filter, expectedValue any) TestDeep {309 g := tdLast{}310 g.initGrepBase(filter, expectedValue)311 return &g312}313func (g *tdLast) Match(ctx ctxerr.Context, got reflect.Value) *ctxerr.Error {314 if g.err != nil {315 return ctx.CollectError(g.err)316 }317 if rErr := grepResolvePtr(ctx, &got); rErr != nil {318 return rErr319 }320 switch got.Kind() {321 case reflect.Slice, reflect.Array:322 for idx := got.Len() - 1; idx >= 0; idx-- {323 item := got.Index(idx)324 ok, rErr := g.matchItem(ctx, idx, item)325 if rErr != nil {326 return rErr327 }328 if ok {329 return deepValueEqual(330 ctx.AddCustomLevel(S("<last#%d>", idx)),331 item,332 g.expectedValue,333 )334 }335 }336 return g.notFound(ctx, got)337 }338 return grepBadKind(ctx, got)339}340func (g *tdLast) TypeBehind() reflect.Type {341 return g.sliceTypeBehind()342}...

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sliceTypeBehind

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1import (2func (t td) sliceTypeBehind() reflect.Type {3 if t.Kind() == reflect.Slice {4 return t.Elem()5 }6}7func main() {8 s := make([]int, 0)9 t := reflect.TypeOf(s)10 fmt.Println(td(t).sliceTypeBehind())11}

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sliceTypeBehind

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1import (2func main() {3 a := []int{1, 2, 3}4 fmt.Println(reflect.TypeOf(a).Elem())5}6Your name to display (optional):7Your name to display (optional):

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sliceTypeBehind

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1import (2func main() {3 fmt.Println("Hello, playground")4 var sli = []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}5 var sli2 = []int{10, 9, 8, 7, 6, 5, 4, 3, 2, 1}6 var sli3 = []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}7 fmt.Println("slice 1", sli)8 fmt.Println("slice 2", sli2)9 fmt.Println("slice 3", sli3)10 fmt.Println("slice 1 length", len(sli))11 fmt.Println("slice 2 length", len(sli2))12 fmt.Println("slice 3 length", len(sli3))13 fmt.Println("slice 1 capacity", cap(sli))14 fmt.Println("slice 2 capacity", cap(sli2))15 fmt.Println("slice 3 capacity", cap(sli3))16 fmt.Println("slice 1 address", &sli)17 fmt.Println("slice 2 address", &sli2)18 fmt.Println("slice 3 address", &sli3)19 var sli4 = append(sli, 11)20 fmt.Println("slice 4", sli4)21 fmt.Println("slice 4 length", len(sli4))22 fmt.Println("slice 4 capacity", cap(sli4))23 fmt.Println("slice 4 address", &sli4)24 var sli5 = append(sli, 12)25 fmt.Println("slice 5", sli5)26 fmt.Println("slice 5 length", len(sli5))27 fmt.Println("slice 5 capacity", cap(sli5))28 fmt.Println("slice 5 address", &sli5)29 fmt.Println("slice 1", sli)30 fmt.Println("slice 2", sli2)31 fmt.Println("slice 3", sli3)32 fmt.Println("slice 1 length", len(sli))33 fmt.Println("slice 2 length", len(sli2))34 fmt.Println("slice 3 length", len(sli3))35 fmt.Println("slice 1 capacity", cap(sli))36 fmt.Println("slice 2 capacity",

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sliceTypeBehind

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1import (2func main() {3 var sliceType = td.sliceTypeBehind([]int{1, 2, 3})4 fmt.Println(sliceType)5}6type td struct{}7func (td) sliceTypeBehind(slice interface{}) string {8 return fmt.Sprintf("%T", slice)9}10import "reflect"11func Sprintf(format string, a ...interface{}) string {12 return format + reflect.TypeOf(a[0]).String()13}

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sliceTypeBehind

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1import (2type td struct {3}4func main() {5 t := reflect.TypeOf(s)6 fmt.Println("Type of s is: ", t)7 td := (*td)(unsafe.Pointer(t))8 fmt.Println("Kind of s is: ", td.kind)9 fmt.Println("Elem of s is: ", td.elem)10 fmt.Println("Len of s is: ", td.len)11 fmt.Println("Cap of s is: ", td.cap)12 fmt.Println("PtrToThis of s is: ", td.ptrToThis)13 fmt.Println("Slice type behind is: ", sliceTypeBehind(t))14}15func sliceTypeBehind(t reflect.Type) reflect.Type {16 return reflect.SliceOf(t.Elem())17}18Elem of s is: &{int 0 0 0 0}19reflect.SliceOf(0x0, 0x0, 0x0, 0x0, 0x0)20main.sliceTypeBehind(0x0, 0x0, 0x0, 0x0, 0x0)21main.main()22reflect.SliceOf(0x0, 0x0, 0x0, 0x0, 0x0)

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sliceTypeBehind

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1import (2func main() {3 fmt.Println(reflect.TypeOf(a))4 fmt.Println(reflect.TypeOf(a).Kind())5 fmt.Println(reflect.TypeOf(a).Elem())6 fmt.Println(reflect.TypeOf(a).Elem().Kind())7}

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sliceTypeBehind

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1import (2type T struct {3}4func main() {5 t := reflect.TypeOf(T{})6 fmt.Println(t)7 fmt.Println(t.FieldByIndex([]int{0}))8 fmt.Println(t.FieldByIndex([]int{1}))9 fmt.Println(t.FieldByIndex([]int{2}))10}11{A int 0 [0] false}12{B string 0 [0] false}13main.main()14import (15type T struct {16}17func main() {18 t := reflect.TypeOf(T{})19 fmt.Println(t)20 f, ok := t.FieldByIndex([]int{0})21 if ok {22 fmt.Println(f)23 }24 f, ok = t.FieldByIndex([]int{1})25 if ok {26 fmt.Println(f)27 }28 f, ok = t.FieldByIndex([]int{2})29 if ok {30 fmt.Println(f)31 }32}33{A int 0 [0] false}34{B string 0 [0] false}

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