How to use mergeStructFields method of td Package

Best Go-testdeep code snippet using td.mergeStructFields

td_struct.go

Source:td_struct.go Github

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...114// value the expected field value (which can be a [TestDeep] operator115// as well as a zero value.)116type StructFields map[string]any117// canonStructField canonicalizes name, a key in a StructFields map,118// so it can be compared with other keys during a mergeStructFields().119// - "name" → "name"120// - "> name " → ">name"121// - " 22 =~ [A-Z].*At$ " → "22=~[A-Z].*At$"122func canonStructField(name string) string {123 r, _ := utf8.DecodeRuneInString(name)124 if r == utf8.RuneError || unicode.IsLetter(r) {125 return name // shortcut126 }127 // Overwrite a field128 if strings.HasPrefix(name, ">") {129 new := strings.TrimSpace(name[1:])130 if 1+len(new) == len(name) {131 return name // already canonicalized132 }133 return ">" + new134 }135 // Matcher136 if subs := parseMatcher(name); subs != nil {137 if len(subs[0])+len(subs[1])+len(subs[2]) == len(name) {138 return name // already canonicalized139 }140 return subs[0] + subs[1] + subs[2]141 }142 // Will probably raise an error later as it cannot be a field, not143 // an overwritter and not a matcher144 return name145}146// mergeStructFields merges all sfs items into one StructFields and147// returns it.148func mergeStructFields(sfs ...StructFields) StructFields {149 switch len(sfs) {150 case 0:151 return nil152 case 1:153 return sfs[0]154 default:155 // Do a smart merge so "> pipo" replaces ">pipo " for example.156 canon2field := map[string]string{}157 ret := make(StructFields, len(sfs[0]))158 for _, sf := range sfs {159 for field, value := range sf {160 canon := canonStructField(field)161 if prevField, ok := canon2field[canon]; ok {162 delete(ret, prevField)163 delete(canon2field, canon)164 } else {165 delete(ret, canon)166 }167 if canon != field {168 canon2field[canon] = field169 }170 ret[field] = value171 }172 }173 return ret174 }175}176func newStruct(model any, strict bool) (*tdStruct, reflect.Value) {177 vmodel := reflect.ValueOf(model)178 st := tdStruct{179 tdExpectedType: tdExpectedType{180 base: newBase(5),181 },182 }183 switch vmodel.Kind() {184 case reflect.Ptr:185 if vmodel.Type().Elem().Kind() != reflect.Struct {186 break187 }188 st.isPtr = true189 if vmodel.IsNil() {190 st.expectedType = vmodel.Type().Elem()191 return &st, reflect.Value{}192 }193 vmodel = vmodel.Elem()194 fallthrough195 case reflect.Struct:196 st.expectedType = vmodel.Type()197 return &st, vmodel198 }199 st.err = ctxerr.OpBadUsage(st.location.Func,200 "(STRUCT|&STRUCT, EXPECTED_FIELDS)",201 model, 1, true)202 return &st, reflect.Value{}203}204func anyStruct(model any, expectedFields StructFields, strict bool) *tdStruct {205 st, vmodel := newStruct(model, strict)206 if st.err != nil {207 return st208 }209 st.expectedFields = make([]fieldInfo, 0, len(expectedFields))210 checkedFields := make(map[string]bool, len(expectedFields))211 var matchers fieldMatcherSlice //nolint: prealloc212 // Check that all given fields are available in model213 stType := st.expectedType214 for fieldName, expectedValue := range expectedFields {215 field, found := stType.FieldByName(fieldName)216 if found {217 st.addExpectedValue(field, expectedValue, "")218 if st.err != nil {219 return st220 }221 checkedFields[fieldName] = false222 continue223 }224 // overwrite model field: ">fieldName", "> fieldName"225 if strings.HasPrefix(fieldName, ">") {226 name := strings.TrimSpace(fieldName[1:])227 field, found = stType.FieldByName(name)228 if !found {229 st.err = ctxerr.OpBad(st.location.Func,230 "struct %s has no field %q (from %q)", stType, name, fieldName)231 return st232 }233 st.addExpectedValue(234 field, expectedValue,235 fmt.Sprintf(" (from %q)", fieldName),236 )237 if st.err != nil {238 return st239 }240 checkedFields[name] = true241 continue242 }243 // matcher: "=~At$", "!~At$", "=*At", "!*At"244 matcher, err := newFieldMatcher(fieldName, expectedValue)245 if err != nil {246 if err == errNotAMatcher {247 st.err = ctxerr.OpBad(st.location.Func,248 "struct %s has no field %q", stType, fieldName)249 } else {250 st.err = ctxerr.OpBad(st.location.Func, err.Error())251 }252 return st253 }254 matchers = append(matchers, matcher)255 }256 // Get all field names257 allFields := map[string]struct{}{}258 stType.FieldByNameFunc(func(fieldName string) bool {259 allFields[fieldName] = struct{}{}260 return false261 })262 // Check initialized fields in model263 if vmodel.IsValid() {264 for fieldName := range allFields {265 overwrite, alreadySet := checkedFields[fieldName]266 if overwrite {267 continue268 }269 field, _ := stType.FieldByName(fieldName)270 if field.Anonymous {271 continue272 }273 vfield := vmodel.FieldByIndex(field.Index)274 // Try to force access to unexported fields275 fieldIf, ok := dark.GetInterface(vfield, true)276 if !ok {277 // Probably in an environment where "unsafe" package is forbidden… :(278 fmt.Fprintf(os.Stderr, //nolint: errcheck279 "%s(): field %s is unexported and cannot be overridden, skip it from model.\n",280 st.location.Func,281 fieldName)282 continue283 }284 // If non-zero field285 if !reflect.DeepEqual(reflect.Zero(field.Type).Interface(), fieldIf) {286 if alreadySet {287 st.err = ctxerr.OpBad(st.location.Func,288 "non zero field %s in model already exists in expectedFields",289 fieldName)290 return st291 }292 st.expectedFields = append(st.expectedFields, fieldInfo{293 name: fieldName,294 expected: vfield,295 index: field.Index,296 unexported: field.PkgPath != "",297 })298 checkedFields[fieldName] = true299 }300 }301 }302 // At least one matcher (regexp/shell pattern)303 if matchers != nil {304 sort.Sort(matchers) // always process matchers in the same order305 for _, m := range matchers {306 for fieldName := range allFields {307 if _, ok := checkedFields[fieldName]; ok {308 continue309 }310 field, _ := stType.FieldByName(fieldName)311 if field.Anonymous {312 continue313 }314 ok, err := m.match(fieldName)315 if err != nil {316 st.err = ctxerr.OpBad(st.location.Func,317 "bad shell pattern field %#q: %s", m.name, err)318 return st319 }320 if ok == m.ok {321 st.addExpectedValue(322 field, m.expected,323 fmt.Sprintf(" (from pattern %#q)", m.name),324 )325 if st.err != nil {326 return st327 }328 checkedFields[fieldName] = true329 }330 }331 }332 }333 // If strict, fill non explicitly expected fields to zero334 if strict {335 for fieldName := range allFields {336 if _, ok := checkedFields[fieldName]; ok {337 continue338 }339 field, _ := stType.FieldByName(fieldName)340 if field.Anonymous {341 continue342 }343 st.expectedFields = append(st.expectedFields, fieldInfo{344 name: fieldName,345 expected: reflect.New(field.Type).Elem(), // zero346 index: field.Index,347 unexported: field.PkgPath != "",348 })349 }350 }351 sort.Sort(st.expectedFields)352 return st353}354func (s *tdStruct) addExpectedValue(field reflect.StructField, expectedValue any, ctxInfo string) {355 var vexpectedValue reflect.Value356 if expectedValue == nil {357 switch field.Type.Kind() {358 case reflect.Chan, reflect.Func, reflect.Interface, reflect.Map,359 reflect.Ptr, reflect.Slice:360 vexpectedValue = reflect.Zero(field.Type) // change to a typed nil361 default:362 s.err = ctxerr.OpBad(s.location.Func,363 "expected value of field %s%s cannot be nil as it is a %s",364 field.Name, ctxInfo, field.Type)365 return366 }367 } else {368 vexpectedValue = reflect.ValueOf(expectedValue)369 if _, ok := expectedValue.(TestDeep); !ok {370 if !vexpectedValue.Type().AssignableTo(field.Type) {371 s.err = ctxerr.OpBad(s.location.Func,372 "type %s of field expected value %s%s differs from struct one (%s)",373 vexpectedValue.Type(),374 field.Name,375 ctxInfo,376 field.Type)377 return378 }379 }380 }381 s.expectedFields = append(s.expectedFields, fieldInfo{382 name: field.Name,383 expected: vexpectedValue,384 index: field.Index,385 unexported: field.PkgPath != "",386 })387}388// summary(Struct): compares the contents of a struct or a pointer on389// a struct390// input(Struct): struct,ptr(ptr on struct)391// Struct operator compares the contents of a struct or a pointer on a392// struct against the non-zero values of model (if any) and the393// values of expectedFields. See [SStruct] to compares against zero394// fields without specifying them in expectedFields.395//396// model must be the same type as compared data.397//398// expectedFields can be omitted, if no zero entries are expected399// and no [TestDeep] operators are involved. If expectedFields400// contains more than one item, all items are merged before their use,401// from left to right.402//403// td.Cmp(t, got, td.Struct(404// Person{405// Name: "John Doe",406// },407// td.StructFields{408// "Children": 4,409// },410// td.StructFields{411// "Age": td.Between(40, 45),412// "Children": 0, // overwrite 4413// }),414// )415//416// It is an error to set a non-zero field in model AND to set the417// same field in expectedFields, as in such cases the Struct418// operator does not know if the user wants to override the non-zero419// model field value or if it is an error. To explicitly override a420// non-zero model in expectedFields, just prefix its name with a421// ">" (followed by some optional spaces), as in:422//423// td.Cmp(t, got, td.Struct(424// Person{425// Name: "John Doe",426// Age: 23,427// Children: 4,428// },429// td.StructFields{430// "> Age": td.Between(40, 45),431// ">Children": 0, // spaces after ">" are optional432// }),433// )434//435// expectedFields can also contain regexps or shell patterns to436// match multiple fields not explicitly listed in model and in437// expectedFields. Regexps are prefixed by "=~" or "!~" to438// respectively match or don't-match. Shell patterns are prefixed by "="439// or "!" to respectively match or don't-match.440//441// td.Cmp(t, got, td.Struct(442// Person{443// Name: "John Doe",444// },445// td.StructFields{446// "=*At": td.Lte(time.Now()), // matches CreatedAt & UpdatedAt fields using shell pattern447// "=~^[a-z]": td.Ignore(), // explicitly ignore private fields using a regexp448// }),449// )450//451// When several patterns can match a same field, it is advised to tell452// go-testdeep in which order patterns should be tested, as once a453// pattern matches a field, the other patterns are ignored for this454// field. To do so, each pattern can be prefixed by a number, as in:455//456// td.Cmp(t, got, td.Struct(457// Person{458// Name: "John Doe",459// },460// td.StructFields{461// "1=*At": td.Lte(time.Now()),462// "2=~^[a-z]": td.NotNil(),463// }),464// )465//466// This way, "*At" shell pattern is always used before "^[a-z]"467// regexp, so if a field "createdAt" exists it is tested against468// time.Now() and never against [NotNil]. A pattern without a469// prefix number is the same as specifying "0" as prefix.470//471// To make it clearer, some spaces can be added, as well as bigger472// numbers used:473//474// td.Cmp(t, got, td.Struct(475// Person{476// Name: "John Doe",477// },478// td.StructFields{479// " 900 = *At": td.Lte(time.Now()),480// "2000 =~ ^[a-z]": td.NotNil(),481// }),482// )483//484// The following example combines all possibilities:485//486// td.Cmp(t, got, td.Struct(487// Person{488// NickName: "Joe",489// },490// td.StructFields{491// "Firstname": td.Any("John", "Johnny"),492// "1 = *[nN]ame": td.NotEmpty(), // matches LastName, lastname, …493// "2 ! [A-Z]*": td.NotZero(), // matches all private fields494// "3 =~ ^(Crea|Upda)tedAt$": td.Gte(time.Now()),495// "4 !~ ^(Dogs|Children)$": td.Zero(), // matches all remaining fields except Dogs and Children496// "5 =~ .": td.NotNil(), // matches all remaining fields (same as "5 = *")497// }),498// )499//500// During a match, all expected fields must be found to501// succeed. Non-expected fields are ignored.502//503// TypeBehind method returns the [reflect.Type] of model.504//505// See also [SStruct].506func Struct(model any, expectedFields ...StructFields) TestDeep {507 return anyStruct(model, mergeStructFields(expectedFields...), false)508}509// summary(SStruct): strictly compares the contents of a struct or a510// pointer on a struct511// input(SStruct): struct,ptr(ptr on struct)512// SStruct operator (aka strict-[Struct]) compares the contents of a513// struct or a pointer on a struct against values of model (if any)514// and the values of expectedFields. The zero values are compared515// too even if they are omitted from expectedFields: that is the516// difference with [Struct] operator.517//518// model must be the same type as compared data.519//520// expectedFields can be omitted, if no [TestDeep] operators are521// involved. If expectedFields contains more than one item, all522// items are merged before their use, from left to right.523//524// To ignore a field, one has to specify it in expectedFields and525// use the [Ignore] operator.526//527// td.Cmp(t, got, td.SStruct(528// Person{529// Name: "John Doe",530// },531// td.StructFields{532// "Children": 4,533// },534// td.StructFields{535// "Age": td.Between(40, 45),536// "Children": td.Ignore(), // overwrite 4537// }),538// )539//540// It is an error to set a non-zero field in model AND to set the541// same field in expectedFields, as in such cases the SStruct542// operator does not know if the user wants to override the non-zero543// model field value or if it is an error. To explicitly override a544// non-zero model in expectedFields, just prefix its name with a545// ">" (followed by some optional spaces), as in:546//547// td.Cmp(t, got, td.SStruct(548// Person{549// Name: "John Doe",550// Age: 23,551// Children: 4,552// },553// td.StructFields{554// "> Age": td.Between(40, 45),555// ">Children": 0, // spaces after ">" are optional556// }),557// )558//559// expectedFields can also contain regexps or shell patterns to560// match multiple fields not explicitly listed in model and in561// expectedFields. Regexps are prefixed by "=~" or "!~" to562// respectively match or don't-match. Shell patterns are prefixed by "="563// or "!" to respectively match or don't-match.564//565// td.Cmp(t, got, td.SStruct(566// Person{567// Name: "John Doe",568// },569// td.StructFields{570// "=*At": td.Lte(time.Now()), // matches CreatedAt & UpdatedAt fields using shell pattern571// "=~^[a-z]": td.Ignore(), // explicitly ignore private fields using a regexp572// }),573// )574//575// When several patterns can match a same field, it is advised to tell576// go-testdeep in which order patterns should be tested, as once a577// pattern matches a field, the other patterns are ignored for this578// field. To do so, each pattern can be prefixed by a number, as in:579//580// td.Cmp(t, got, td.SStruct(581// Person{582// Name: "John Doe",583// },584// td.StructFields{585// "1=*At": td.Lte(time.Now()),586// "2=~^[a-z]": td.NotNil(),587// }),588// )589//590// This way, "*At" shell pattern is always used before "^[a-z]"591// regexp, so if a field "createdAt" exists it is tested against592// time.Now() and never against [NotNil]. A pattern without a593// prefix number is the same as specifying "0" as prefix.594//595// To make it clearer, some spaces can be added, as well as bigger596// numbers used:597//598// td.Cmp(t, got, td.SStruct(599// Person{600// Name: "John Doe",601// },602// td.StructFields{603// " 900 = *At": td.Lte(time.Now()),604// "2000 =~ ^[a-z]": td.NotNil(),605// }),606// )607//608// The following example combines all possibilities:609//610// td.Cmp(t, got, td.SStruct(611// Person{612// NickName: "Joe",613// },614// td.StructFields{615// "Firstname": td.Any("John", "Johnny"),616// "1 = *[nN]ame": td.NotEmpty(), // matches LastName, lastname, …617// "2 ! [A-Z]*": td.NotZero(), // matches all private fields618// "3 =~ ^(Crea|Upda)tedAt$": td.Gte(time.Now()),619// "4 !~ ^(Dogs|Children)$": td.Zero(), // matches all remaining fields except Dogs and Children620// "5 =~ .": td.NotNil(), // matches all remaining fields (same as "5 = *")621// }),622// )623//624// During a match, all expected and zero fields must be found to625// succeed.626//627// TypeBehind method returns the [reflect.Type] of model.628//629// See also [SStruct].630func SStruct(model any, expectedFields ...StructFields) TestDeep {631 return anyStruct(model, mergeStructFields(expectedFields...), true)632}633func (s *tdStruct) Match(ctx ctxerr.Context, got reflect.Value) (err *ctxerr.Error) {634 if s.err != nil {635 return ctx.CollectError(s.err)636 }637 err = s.checkPtr(ctx, &got, false)638 if err != nil {639 return ctx.CollectError(err)640 }641 err = s.checkType(ctx, got)642 if err != nil {643 return ctx.CollectError(err)644 }645 ignoreUnexported := ctx.IgnoreUnexported || ctx.Hooks.IgnoreUnexported(got.Type())...

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td_struct_private_test.go

Source:td_struct_private_test.go Github

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...23 test.EqualStr(t, canonStructField(tst.got), tst.expected)24 }25}26func TestMergeStructFields(t *testing.T) {27 sfs := mergeStructFields()28 if sfs != nil {29 t.Errorf("not nil")30 }31 x := StructFields{}32 sfs = mergeStructFields(x)33 if reflect.ValueOf(sfs).Pointer() != reflect.ValueOf(x).Pointer() {34 t.Errorf("not x")35 }36 a := StructFields{"pipo": 1}37 b := StructFields{"pipo": 2}38 c := StructFields{"pipo": 3}39 sfs = mergeStructFields(a, b, c)40 if reflect.ValueOf(sfs).Pointer() == reflect.ValueOf(c).Pointer() {41 t.Errorf("is c")42 }43 test.EqualInt(t, len(sfs), 1)44 test.EqualInt(t, sfs["pipo"].(int), 3)45 a = StructFields{">pipo": 1}46 b = StructFields{"> pipo": 2}47 c = StructFields{">pipo ": 3}48 sfs = mergeStructFields(a, b, c)49 if reflect.ValueOf(sfs).Pointer() == reflect.ValueOf(c).Pointer() {50 t.Errorf("is c")51 }52 test.EqualInt(t, len(sfs), 1)53 test.EqualInt(t, sfs[">pipo "].(int), 3)54 a = StructFields{"1=~pipo": 1}55 b = StructFields{" 1 =~ pipo ": 2}56 c = StructFields{"1\t=~\tpipo": 3}57 sfs = mergeStructFields(a, b, c)58 if reflect.ValueOf(sfs).Pointer() == reflect.ValueOf(c).Pointer() {59 t.Errorf("is c")60 }61 test.EqualInt(t, len(sfs), 1)62 test.EqualInt(t, sfs["1\t=~\tpipo"].(int), 3)63}64func TestFieldMatcher(t *testing.T) {65 _, err := newFieldMatcher("pipo", 123)66 if test.Error(t, err) {67 if err != errNotAMatcher {68 t.Errorf("got %q, but %q was expected", err, errNotAMatcher)69 }70 }71 for _, tst := range []struct {...

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mergeStructFields

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1import (2type A struct {3}4type B struct {5}6func main() {7 var a = A{1, "a"}8 var b = B{2, "b"}9 var c = mergeStructFields(a, b)10 fmt.Println(c)11}12func mergeStructFields(a, b interface{}) interface{} {13 ta := reflect.TypeOf(a)14 va := reflect.ValueOf(a)15 tb := reflect.TypeOf(b)16 vb := reflect.ValueOf(b)17 tc := reflect.StructOf([]reflect.StructField{18 {Name: "A1", Type: ta.Field(0).Type},19 {Name: "A2", Type: ta.Field(1).Type},20 {Name: "B1", Type: tb.Field(0).Type},21 {Name: "B2", Type: tb.Field(1).Type},22 })23 vc := reflect.New(tc)24 vc.Elem().Field(0).Set(va.Field(0))25 vc.Elem().Field(1).Set(va.Field(1))26 vc.Elem().Field(2).Set(vb.Field(0))27 vc.Elem().Field(3).Set(vb.Field(1))28 return vc.Interface()29}30{1 a 2 b}

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mergeStructFields

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1import (2type td struct {3}4func main() {5 t1 := td{Name: "John", Age: 30}6 t2 := td{Name: "Jane", Age: 20}7 t3 := mergeStructFields(t1, t2)8 fmt.Println(t3)9}10import (11type td struct {12}13func mergeStructFields(a, b interface{}) interface{} {14 aType := reflect.TypeOf(a)15 aValue := reflect.ValueOf(a)16 bType := reflect.TypeOf(b)17 bValue := reflect.ValueOf(b)18 cValue := reflect.New(aType).Elem()19 for i := 0; i < aValue.NumField(); i++ {20 aValueField := aValue.Field(i)21 bValueField := bValue.Field(i)22 aFieldType := aType.Field(i)23 bFieldType := bType.Field(i)24 if aFieldType.PkgPath == "" && bFieldType.PkgPath == "" {25 if aFieldType.Type.Kind() == reflect.Int && bFieldType.Type.Kind() == reflect.Int {26 cValue.Field(i).SetInt(aValueField.Int() + bValueField.Int())27 } else {28 cValue.Field(i).Set(aValueField)29 }30 }31 }32 return cValue.Interface()33}

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mergeStructFields

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1import (2type td struct {3}4func (t *td) mergeStructFields() {5 t1 := reflect.TypeOf(*t)6 v1 := reflect.ValueOf(*t)7 for i := 0; i < t1.NumField(); i++ {8 fmt.Println("Name: ", t1.Field(i).Name, "Value: ", v1.Field(i).Int())9 }10}11func main() {12 t := td{A: 10, B: 20}13 t.mergeStructFields()14}

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mergeStructFields

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1func main() {2 td := &td{}3 td.mergeStructFields()4}5type td struct {6}7func (td *td) mergeStructFields() {8 t := reflect.TypeOf(*td)9 for i := 0; i < t.NumField(); i++ {10 field := t.Field(i)11 jsonTag := field.Tag.Get("json")12 if jsonTag != "" {13 fields = append(fields, jsonTag)14 }15 }16 fmt.Println(fields)17}18import (19type td struct {20}21func (td *td) mergeStructFields() {22 t := reflect.TypeOf(*td)23 for i := 0; i < t.NumField(); i++ {24 field := t.Field(i)25 jsonTag := field.Tag.Get("json")26 if jsonTag != "" {27 fields = append(fields, jsonTag)28 }29 }30 fmt.Println(fields)31}32func main() {33 td := &td{}34 td.mergeStructFields()35}36I am trying to use the go playground to test some code. I have a package that I'm importing from github. I'm using the playground to test a function in that package. I've tried to import the package using the following syntax:37import "github.com/username/reponame"

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mergeStructFields

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1import "fmt"2type td struct {3}4func main() {5 t1 := td{"John", 25, "USA"}6 t2 := td{"Mike", 20, "UK"}7 t1.mergeStructFields(t2)8 fmt.Println(t1)9}10import "fmt"11type td struct {12}13func main() {14 t1 := td{"John", 25, "USA"}15 t2 := td{"Mike", 20, "UK"}16 t1.mergeStructFields(t2)17 fmt.Println(t1)18}19import "fmt"20type td struct {21}22func main() {23 t1 := td{"John", 25, "USA"}24 t2 := td{"Mike", 20, "UK"}25 t1.mergeStructFields(t2)26 fmt.Println(t1)27}28import "fmt"29type td struct {30}31func main() {32 t1 := td{"John", 25, "USA"}33 t2 := td{"Mike", 20, "UK"}34 t1.mergeStructFields(t2)35 fmt.Println(t1)36}37import "fmt"38type td struct {39}40func main() {41 t1 := td{"John", 25, "USA"}42 t2 := td{"Mike", 20, "UK"}43 t1.mergeStructFields(t2)44 fmt.Println(t1)45}46import "fmt"47type td struct {48}49func main() {50 t1 := td{"John", 25, "USA"}

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mergeStructFields

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1type td struct {2}3func main() {4 t := td{time.Now(), time.Now()}5 fmt.Println(t)6 fmt.Println(mergeStructFields(t))7}8import (9func main() {10 f, err := os.Create("test.txt")11 if err != nil {12 panic(err)13 }14 defer f.Close()15 fmt.Fprintf(f, "Hello, World! %v", 10)16}17import (18func main() {19 fmt.Fprintf(os.Stdout, "Hello, World! %v", 10)20}21import (22func main() {23 fmt.Fprintf(os.Stderr, "Hello, World! %v", 10)24}25import (26func main() {27 f, err := os.Create("test.txt")28 if err != nil {29 panic(err)30 }31 defer f.Close()32 fmt.Fprintf(f, "Hello, World! %v", 10)33}34import (35func main() {36 f, err := os.Create("test.txt")37 if err != nil {38 panic(err)39 }40 defer f.Close()41 fmt.Fprint(f, "Hello, World! %v", 10)42}

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mergeStructFields

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1import (2type td struct {3}4func main() {5 t := td{"a", 1, 2.2}6 fmt.Println("t is of type", reflect.TypeOf(t))7 fmt.Println("t is of value", t)8 s := td{"b", 2, 3.3}9 fmt.Println("s is of type", reflect.TypeOf(s))10 fmt.Println("s is of value", s)11 t.mergeStructFields(s)12 fmt.Println("t is of value after merge", t)13}14import (15type td struct {16}17func main() {18 t := td{"a", 1, 2.2}19 fmt.Println("t is of type", reflect.TypeOf(t))20 fmt.Println("t is of value", t)21 s := td{"b", 2, 3.3}22 fmt.Println("s is of type", reflect.TypeOf(s))23 fmt.Println("s is of value", s)24 t.mergeStructFields(s)25 fmt.Println("t is of value after merge", t)26}27import (28type td struct {29}30func main() {31 t := td{"a", 1, 2.2}32 fmt.Println("t is of type", reflect.TypeOf(t))33 fmt.Println("t is of value", t)34 s := td{"b", 2, 3.3}35 fmt.Println("s is of type", reflect.TypeOf(s))36 fmt.Println("s is of value", s)37 t.mergeStructFields(s)38 fmt.Println("t is of value after merge", t)39}40import (41type td struct {

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mergeStructFields

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1func main() {2 td := new(TypeDefinition)3 type1 := td.CreateStructType("struct1")4 type2 := td.CreateStructType("struct2")5 field1 := td.CreateStructField("field1", "int")6 field2 := td.CreateStructField("field2", "string")7 td.AddStructField(type1, field1)8 td.AddStructField(type1, field2)9 td.AddStructField(type2, field1)10 td.AddStructField(type2, field2)11 fmt.Println("Struct Type 1:")12 td.PrintStructType(type1)13 fmt.Println("Struct Type 2:")14 td.PrintStructType(type2)15 td.MergeStructFields(type1, type2)16 fmt.Println("Merged Struct Type:")17 td.PrintStructType(type1)18}19struct1 {20}21struct2 {22}23struct1 {24}25func main() {26 td := new(TypeDefinition)27 type1 := td.CreateStructType("struct1")28 type2 := td.CreateStructType("struct2")29 field1 := td.CreateStructField("field1", "int")30 field2 := td.CreateStructField("field2", "string")31 td.AddStructField(type1, field1)32 td.AddStructField(type1, field2)33 td.AddStructField(type2, field1)34 td.AddStructField(type2, field2)35 fmt.Println("Struct

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