How to use UnknownDecorator method of types Package

Best Ginkgo code snippet using types.UnknownDecorator

node.go

Source:node.go Github

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...228 if node.Body == nil && !node.MarkedPending && !trackedFunctionError {229 appendError(types.GinkgoErrors.MissingBodyFunction(node.CodeLocation, nodeType))230 }231 for _, arg := range remainingArgs {232 appendError(types.GinkgoErrors.UnknownDecorator(node.CodeLocation, nodeType, arg))233 }234 if len(errors) > 0 {235 return Node{}, errors236 }237 return node, errors238}239func NewSynchronizedBeforeSuiteNode(proc1Body func() []byte, allProcsBody func([]byte), codeLocation types.CodeLocation) (Node, []error) {240 return Node{241 ID: UniqueNodeID(),242 NodeType: types.NodeTypeSynchronizedBeforeSuite,243 SynchronizedBeforeSuiteProc1Body: proc1Body,244 SynchronizedBeforeSuiteAllProcsBody: allProcsBody,245 CodeLocation: codeLocation,246 }, nil...

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expressions.go

Source:expressions.go Github

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1// Package expressions provides the ability to inspect and evaluate arbitrary2// user-defined expressions. We use the Cel-Go package as a runtime to implement3// computationally bounded, non-turing complete expressions with a familiar c-like4// syntax.5//6// Unlike cel-go's defaults, this package handles unknowns similarly to null values,7// and allows arbitrary attributes within expressions without errors. We also8// provide basic type coercion allowing eg. int <> float comparisons, which errors9// within cel by default.10//11// Expressions can be inspected to determine the variables that they reference,12// partially evaluated with missing data, and report timestamps used within the13// expression for future reference (eg. recomputing state at that time).14package expressions15import (16 "context"17 "fmt"18 "strings"19 "time"20 "github.com/google/cel-go/cel"21 "github.com/google/cel-go/common/types"22 "github.com/pkg/errors"23 expr "google.golang.org/genproto/googleapis/api/expr/v1alpha1"24)25var (26 ErrNoResult = errors.New("expression did not return true or false")27 ErrInvalidResult = errors.New("expression errored")28)29// Evaluable represents a cacheable, goroutine safe manager for evaluating a single30// precompiled expression with arbitrary data.31type Evaluable interface {32 // Evaluate tests the incoming Data against the expression that is33 // stored within the Evaluable implementation.34 //35 // Attributes that are present within the expression but missing from the36 // data should be treated as null values; the expression must not error.37 Evaluate(ctx context.Context, data *Data) (bool, *time.Time, error)38 // UsedAttributes returns the attributes that are referenced within the39 // expression.40 UsedAttributes(ctx context.Context) *UsedAttributes41 // FilteredAttributes filters the given data to contain only attributes42 // referenced from the expression.43 FilteredAttributes(ctx context.Context, data *Data) *Data44}45// Evaluate is a helper function to create a new, cached expression evaluator to evaluate46// the given data immediately.47func Evaluate(ctx context.Context, expression string, input map[string]interface{}) (bool, *time.Time, error) {48 eval, err := NewExpressionEvaluator(ctx, expression)49 if err != nil {50 return false, nil, err51 }52 data := NewData(input)53 return eval.Evaluate(ctx, data)54}55// NewExpressionEvaluator returns a new Evaluable instance for a given expression. The56// instance can be used across many goroutines to evaluate the expression against any57// data. The Evaluable instance is loaded from the cache, or is cached if not found.58func NewExpressionEvaluator(ctx context.Context, expression string) (Evaluable, error) {59 e, err := env()60 if err != nil {61 return nil, err62 }63 ast, issues := e.Compile(expression)64 if issues != nil {65 return nil, fmt.Errorf("error compiling expression: %w", issues.Err())66 }67 eval := &expressionEvaluator{68 ast: ast,69 env: e,70 expression: expression,71 }72 if err := eval.parseAttributes(ctx); err != nil {73 return nil, err74 }75 return eval, nil76}77type expressionEvaluator struct {78 // TODO: Refactor unknownEval to remove the need tor attr.Eval(activation),79 // and make dateRefs thread safe. We can then place a cel.Program on the80 // evaluator as it's thread safe. Without these changes, Programs are bound81 // to specific expression & data combinations.82 ast *cel.Ast83 env *cel.Env84 // expression is the raw expression85 expression string86 // attrs is allows us to determine which attributes are used within an expression.87 // This is needed to create partial activations, and is also used to optimistically88 // load only necessary attributes.89 attrs *UsedAttributes90}91// Evaluate compiles an expression string against a set of variables, returning whether the92// expression evaluates to true, the next earliest time to re-test the evaluation (if dates are93// compared), and any errors.94func (e *expressionEvaluator) Evaluate(ctx context.Context, data *Data) (bool, *time.Time, error) {95 if data == nil {96 return false, nil, nil97 }98 act, err := data.Partial(ctx, *e.attrs)99 if err != nil {100 return false, nil, err101 }102 // We want to perform an exhaustive search and track the state of the search103 // to see if dates are compared, then return the minimum date compared.104 tr, td := timeDecorator(act)105 // Create the program, refusing to short circuit if a match is found.106 //107 // This will add all functions from functions.StandardOverloads as we108 // created the environment with our custom library.109 program, err := e.env.Program(110 e.ast,111 cel.EvalOptions(cel.OptExhaustiveEval, cel.OptTrackState, cel.OptPartialEval), // Exhaustive, always, right now.112 cel.CustomDecorator(unknownDecorator(act)),113 cel.CustomDecorator(td),114 )115 if err != nil {116 return false, nil, err117 }118 result, _, err := program.Eval(act)119 if result == nil {120 return false, nil, ErrNoResult121 }122 if types.IsUnknown(result) {123 // When evaluating to a strict result this should never happen. We inject a decorator124 // to handle unknowns as values similar to null, and should always get a value.125 return false, nil, nil126 }127 if types.IsError(result) {128 return false, nil, errors.Wrapf(ErrInvalidResult, "invalid type comparison: %s", err.Error())129 }130 if err != nil {131 // This shouldn't be handled, as we should get an Error type in result above.132 return false, nil, fmt.Errorf("error evaluating expression '%s': %w", e.expression, err)133 }134 b, ok := result.Value().(bool)135 if !ok {136 return false, nil, errors.Wrapf(ErrInvalidResult, "returned type %T (%s)", result, result)137 }138 // Find earliest date that we need to test against.139 earliest := tr.Next()140 return b, earliest, nil141}142// UsedAttributes returns the attributes used within the expression.143func (e *expressionEvaluator) UsedAttributes(ctx context.Context) *UsedAttributes {144 return e.attrs145}146// FilteredAttributes returns a new Data pointer with only the attributes147// used within the expression.148func (e *expressionEvaluator) FilteredAttributes(ctx context.Context, d *Data) *Data {149 if d == nil {150 return nil151 }152 filtered := map[string]interface{}{}153 current := filtered154 stack := e.attrs.FullPaths()155 for len(stack) > 0 {156 path := stack[0]157 stack = stack[1:]158 val, ok := d.Get(ctx, path)159 if !ok {160 continue161 }162 for n, part := range path {163 if n == len(path)-1 {164 // This is the value.165 current[part] = val166 continue167 }168 if _, ok := current[part]; !ok {169 current[part] = map[string]interface{}{}170 }171 current = current[part].(map[string]interface{})172 }173 current = filtered174 }175 // It is safe to set data directly here, as we've manually176 // created a map containing raw values from a previously set177 // Data field. This prevents us from needlesly mapifying178 // data from a constructor.179 return &Data{data: filtered}180}181// ParseAttributes returns the attributes used within the expression.182func (e *expressionEvaluator) parseAttributes(ctx context.Context) error {183 if e.attrs != nil {184 return nil185 }186 attrs := &UsedAttributes{187 Root: []string{},188 Fields: map[string][][]string{},189 }190 // Walk through the AST, looking for all instances of "select_expr" expression191 // kinds. These elements are specifically selecting fields from parents, which192 // is exactly what we need to figure out the variables used within an expression.193 stack := []*expr.Expr{e.ast.Expr()}194 for len(stack) > 0 {195 ast := stack[0]196 stack = stack[1:]197 // Depending on the item, add the following198 switch ast.ExprKind.(type) {199 case *expr.Expr_ComprehensionExpr:200 // eg. "event.data.tags.exists(x, x == 'Open'), so put what we're iterating over201 // onto the stack to parse, ignoring this function call but adding the data.202 c := ast.GetComprehensionExpr()203 stack = append(stack, c.IterRange)204 case *expr.Expr_CallExpr:205 // Everything is a function call:206 // - > evaluates to _>_ with two arguments, etc.207 // This means pop all args onto the stack so that we can find208 // all select expressions.209 stack = append(stack, ast.GetCallExpr().GetArgs()...)210 case *expr.Expr_IdentExpr:211 name := ast.GetIdentExpr().Name212 attrs.add(name, nil)213 case *expr.Expr_SelectExpr:214 // Note that the select expression unravels from the deepest key first:215 // given "event.data.foo.bar", the current ast node will be for "foo"216 // and the field name will be for "bar".217 //218 // Iterate through all object selects until there are no more, adding219 // to the path.220 path := []string{}221 for ast.GetSelectExpr() != nil {222 path = append([]string{ast.GetSelectExpr().Field}, path...)223 ast = ast.GetSelectExpr().Operand224 }225 ident := ast.GetIdentExpr()226 caller := ast.GetCallExpr()227 if ident == nil && caller != nil && caller.Function == "_[_]" {228 // This might be square notation: "actions[1]". This should229 // have two args: the object (eg. actions), which is an230 // IdentExpr, and a ConstExpr containing the number.231 args := caller.GetArgs()232 if len(args) != 2 {233 return fmt.Errorf("unknown number of callers for bracket notation: %d", len(args))234 }235 // Functions have been rewritten to move "actions.1" into a string:236 // actions["1"]237 id := args[1].GetConstExpr().GetStringValue()238 path = append([]string{args[0].GetIdentExpr().GetName(), id}, path...)239 }240 if ident != nil {241 path = append([]string{ident.Name}, path...)242 }243 root := path[0]244 fields := path[1:]245 attrs.add(root, fields)246 }247 }248 e.attrs = attrs249 return nil250}251// UsedAttributes represents the evaluated expression's root and top-level fields used.252type UsedAttributes struct {253 // Root represents root-level variables used within the expression254 Root []string255 // Fields represent fields within each root-level variable accessed.256 //257 // For example, given an attribute of "event.data.index", this map holds258 // a key of "event" with a slice of [][]string{{"data", "index"}}259 Fields map[string][][]string260 // exists261 exists map[string]struct{}262}263// FullPaths returns a slice of path slices with the roots appended.264func (u UsedAttributes) FullPaths() [][]string {265 paths := [][]string{}266 for root, items := range u.Fields {267 for _, path := range items {268 path = append([]string{root}, path...)269 paths = append(paths, path)270 }271 }272 return paths273}274func (u *UsedAttributes) add(root string, path []string) {275 if u.exists == nil {276 u.exists = map[string]struct{}{}277 }278 if _, ok := u.Fields[root]; !ok {279 u.Root = append(u.Root, root)280 u.Fields[root] = [][]string{}281 }282 // Add this once.283 key := fmt.Sprintf("%s.%s", root, strings.Join(path, "."))284 if _, ok := u.exists[key]; !ok && len(path) > 0 {285 u.Fields[root] = append(u.Fields[root], path)286 // store this key so it's not duplicated.287 u.exists[key] = struct{}{}288 }289}...

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unknown.go

Source:unknown.go Github

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1package expressions2import (3 "fmt"4 "strings"5 "github.com/google/cel-go/common/operators"6 "github.com/google/cel-go/common/overloads"7 "github.com/google/cel-go/common/types"8 "github.com/google/cel-go/common/types/ref"9 "github.com/google/cel-go/interpreter"10 "github.com/google/cel-go/interpreter/functions"11)12// unknownDecorator returns a decorator for inspecting and handling unknowns at runtime. This13// decorator is called before _any_ attribute or function is evaluated in CEL, allowing us to14// intercept and return our own values.15//16// For example, natively in CEL `size(null)` returns a "no such overload" error. We intercept17// the evalutation of `size(null)` and return a new type (0) instead of the error.18func unknownDecorator(act interpreter.PartialActivation) interpreter.InterpretableDecorator {19 // Create a new dispatcher with all functions added20 dispatcher := interpreter.NewDispatcher()21 overloads := append(functions.StandardOverloads(), celOverloads()...)22 _ = dispatcher.Add(overloads...)23 return func(i interpreter.Interpretable) (interpreter.Interpretable, error) {24 // If this is a fold call, this is a macro (exists, has, etc), and is not an InterpretableCall25 call, ok := i.(interpreter.InterpretableCall)26 if !ok {27 return i, nil28 }29 argTypes := &argColl{}30 args := call.Args()31 for _, arg := range args {32 // We want both attributes (variables) & consts to check for coercion.33 argTypes.Add(arg.Eval(act))34 }35 if argTypes.TypeLen() == 1 && !argTypes.Exists(types.ErrType) && !argTypes.Exists(types.UnknownType) {36 // A single type used within the function with no error and unknown is37 // safe to call as usual.38 return i, nil39 }40 if argTypes.Exists(types.ErrType) || argTypes.Exists(types.UnknownType) {41 // We work with unknown and error types, handling both as non-existent42 // types.43 //44 // Errors can appear when calling macros on unknowns (eg:45 // event.data.nonexistent.subkey.contains("something")).46 //47 // This could be because:48 //49 // 1. we're calling a macro on an unknown value. This happens before we can intercept50 // the InterpretableCall and will always happen. That's fine, and this produces the51 // error "no such key". These are the errors we want to intercept.52 //53 // 2. we're inside a macro and we're using the __result__ or lambda54 // variable. This error contains "no such attribute", and this is a usual55 // part of runing macros. XXX: Figure out why Eval() on macro variables fails:56 // this is actually _not_ an error.57 for _, val := range argTypes.OfType(types.ErrType) {58 if strings.HasPrefix(val.(error).Error(), "no such attribute") {59 // This must be a macro call; handle as usual60 return i, nil61 }62 }63 // This is an unknown type. Dependent on the function being called return64 // a concrete true or false value by default.65 return handleUnknownCall(call, argTypes)66 }67 // Here we have multiple types called together. If these are coercible, we'll68 // attempt to coerce them (eg. ints and floats).69 //70 // We can't create a custom null type, because Compare may run on String, Int, Double,71 // etc: we'd have to wrap every type and add null checking. This is a maintenance72 // en and could be bug-prone.73 //74 // Therefore, we have to evaluate this here within a decorator.75 if argTypes.Exists(types.NullType) && argTypes.ArgLen() == 2 {76 switch call.Function() {77 case operators.Equals:78 return staticCall{result: types.False, InterpretableCall: call}, nil79 case operators.NotEquals:80 return staticCall{result: types.True, InterpretableCall: call}, nil81 }82 // Other operators, such as >, <=, depend on the argument order to evaluate83 // correctly.84 //85 // We must create a new zero type in place of the null argument,86 // then fetch the overload from the standard dispatcher and run the function.87 args, err := argTypes.ZeroValArgs()88 if err != nil {89 return i, nil90 }91 fn, ok := dispatcher.FindOverload(call.Function())92 if !ok {93 return i, nil94 }95 return staticCall{result: fn.Binary(args[0], args[1]), InterpretableCall: call}, nil96 }97 return i, nil98 }99}100// By default, CEL tracks unknowns as a separate value. This is fantastic, but when101// we're evaluating expressions we want to treat unknowns as nulls.102//103// This functionality adds custom logic for each overload to return a static ref.Val104// which is used in place of unknown.105func handleUnknownCall(i interpreter.InterpretableCall, args *argColl) (interpreter.Interpretable, error) {106 switch i.Function() {107 case operators.Equals:108 // Comparing an unknown to null is true, else return false.109 result := types.False110 if args.Exists(types.NullType) {111 result = types.True112 }113 return staticCall{result: result, InterpretableCall: i}, nil114 case operators.NotEquals:115 if args.Exists(types.NullType) {116 // Unknowns are null, so this is false.117 return staticCall{result: types.False, InterpretableCall: i}, nil118 }119 // Are we comparing against a zero type (eg. empty string, 0).120 // The only item that should return true is not equals, as nil is always not equals121 return staticCall{result: types.True, InterpretableCall: i}, nil122 case operators.Less, operators.LessEquals:123 // Unknown is less than anything.124 if args.arguments[0].Type() == types.UnknownType || args.arguments[0].Type() == types.ErrType {125 return staticCall{result: types.True, InterpretableCall: i}, nil126 }127 return staticCall{result: types.False, InterpretableCall: i}, nil128 case operators.Greater, operators.GreaterEquals:129 // If the first arg is unkown, return false: unknown is not greater.130 if args.arguments[0].Type() == types.UnknownType || args.arguments[0].Type() == types.ErrType {131 return staticCall{result: types.False, InterpretableCall: i}, nil132 }133 return staticCall{result: types.True, InterpretableCall: i}, nil134 case overloads.Size,135 overloads.SizeString,136 overloads.SizeBytes,137 overloads.SizeList,138 overloads.SizeStringInst,139 overloads.SizeBytesInst,140 overloads.SizeListInst,141 overloads.SizeMapInst:142 // Size on unknowns should always return zero to avoid type errors.143 return staticCall{result: types.IntZero, InterpretableCall: i}, nil144 default:145 // By default, return false, for eaxmple: "_<_", "@in", "@not_strictly_false"146 // return staticCall{result: types.False, InterpretableCall: call}, nil147 return staticCall{result: types.False, InterpretableCall: i}, nil148 }149}150// staticCall represents a wrapped interpreter.InterpretableCall function within151// an expression that always returns a static value.152type staticCall struct {153 interpreter.InterpretableCall154 result ref.Val155}156func (u staticCall) Eval(ctx interpreter.Activation) ref.Val {157 return u.result158}159// argColl inspects all of the types available within a function call in160// CEL, storing their type information.161type argColl struct {162 // types represents a map of types to their values used within the163 // function.164 types map[ref.Type][]ref.Val165 // arguments represents the function arguments, in order.166 arguments []ref.Val167}168// Add adds a new value to the type collection, storing its type in the map.169func (t *argColl) Add(vals ...ref.Val) {170 if t.types == nil {171 t.types = map[ref.Type][]ref.Val{}172 }173 for _, val := range vals {174 // Store the arguments in order (left and right hand side of operators)175 t.arguments = append(t.arguments, val)176 typ := val.Type()177 coll, ok := t.types[typ]178 if !ok {179 t.types[typ] = []ref.Val{val}180 return181 }182 t.types[typ] = append(coll, val)183 }184}185func (t *argColl) TypeLen() int {186 return len(t.types)187}188func (t *argColl) ArgLen() int {189 return len(t.arguments)190}191func (t *argColl) Exists(typ ref.Type) bool {192 _, ok := t.types[typ]193 return ok194}195// OfType returns all arguments of the given type.196func (t *argColl) OfType(typ ref.Type) []ref.Val {197 coll, ok := t.types[typ]198 if !ok {199 return nil200 }201 return coll202}203// NonNull returns all non-null types as a slice.204func (t *argColl) NonNull() []ref.Type {205 coll := []ref.Type{}206 for typ := range t.types {207 if typ == types.NullType {208 continue209 }210 coll = append(coll, typ)211 }212 return coll213}214// ZeroValArgs returns all args with null types replaced as zero values215func (t *argColl) ZeroValArgs() ([]ref.Val, error) {216 typ := t.NonNull()217 if len(typ) != 1 {218 return t.arguments, fmt.Errorf("not exactly one other non-null type present")219 }220 coll := make([]ref.Val, len(t.arguments))221 for n, arg := range t.arguments {222 coll[n] = arg223 if arg.Type() == types.NullType {224 coll[n] = zeroVal(typ[0])225 }226 }227 return coll, nil228}229// zeroVal returns a zero value for common cel datatypes. This helps us230// convert null values to a zero value of a specific type.231func zeroVal(t ref.Type) ref.Val {232 switch t.TypeName() {233 case "int":234 return types.IntZero235 case "uint":236 return types.Uint(0)237 case "double":238 return types.Double(0)239 case "string":240 return types.String("")241 }242 return types.NullValue243}...

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UnknownDecorator

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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}9GoLang | reflect.ValueOf() method10Recommended Posts: GoLang | reflect.TypeOf() method

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UnknownDecorator

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1import "fmt"2import "reflect"3type T struct {4}5func main() {6 t := T{23, "skidoo"}7 s := reflect.ValueOf(&t).Elem()8 typeOfT := s.Type()9 for i := 0; i < s.NumField(); i++ {10 f := s.Field(i)11 fmt.Printf("%d: %s %s = %v12 typeOfT.Field(i).Name, f.Type(), f.Interface())13 }14 s.Field(0).SetInt(77)15 s.Field(1).SetString("Sunset Strip")16 fmt.Println("t is now", t)17}18t is now {77 Sunset Strip}19import "fmt"20import "reflect"21type T struct {22}23func main() {24 t := T{23, "skidoo"}25 s := reflect.ValueOf(&t).Elem()26 s.Field(0).Set(reflect.ValueOf(77))27 s.Field(1).Set(reflect.ValueOf("Sunset Strip"))28 fmt.Println("t is now", t)29}30t is now {77 Sunset Strip}

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UnknownDecorator

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1import (2func main() {3 fmt.Println(reflect.TypeOf(1).Kind())4 fmt.Println(reflect.TypeOf(1.2).Kind())5 fmt.Println(reflect.TypeOf("abc").Kind())6 fmt.Println(reflect.TypeOf(true).Kind())7}8import (9func main() {10 fmt.Println(reflect.TypeOf(1).Name())11 fmt.Println(reflect.TypeOf(1.2).Name())12 fmt.Println(reflect.TypeOf("abc").Name())13 fmt.Println(reflect.TypeOf(true).Name())14}15import (16func main() {17 fmt.Println(reflect.TypeOf(1).String())18 fmt.Println(reflect.TypeOf(1.2).String())19 fmt.Println(reflect.TypeOf("abc").String())20 fmt.Println(reflect.TypeOf(true).String())21}22import (23func main() {24 fmt.Println(reflect.TypeOf(1).Size())25 fmt.Println(reflect.TypeOf(1.2).Size())26 fmt.Println(reflect.TypeOf("abc").Size())27 fmt.Println(reflect.TypeOf(true).Size())28}29import (30func main() {31 fmt.Println(reflect.TypeOf(1).Align())32 fmt.Println(reflect.TypeOf(1.2).Align())33 fmt.Println(reflect.TypeOf("abc").Align())34 fmt.Println(reflect.TypeOf(true).Align())35}36import (37func main() {38 fmt.Println(reflect.TypeOf(1).FieldAlign())

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UnknownDecorator

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1import (2func main() {3 type T struct {4 }5 t := T{23, "skidoo"}6 s := reflect.ValueOf(&t).Elem()7 typeOfT := s.Type()8 for i := 0; i < s.NumField(); i++ {9 f := s.Field(i)10 fmt.Printf("%d: %s %s = %v11 typeOfT.Field(i).Name, f.Type(), f.Interface())12 }13}14import (15func main() {16 type T struct {17 }18 t := T{23, "skidoo"}19 s := reflect.ValueOf(&t).Elem()20 typeOfT := s.Type()21 for i := 0; i < s.NumField(); i++ {22 f := s.Field(i)23 fmt.Printf("%d: %s %s = %v24 typeOfT.Field(i).Name, f.Type(), f.Interface())25 }26}27import (28func main() {29 type T struct {30 }31 t := T{23, "skidoo"}32 s := reflect.ValueOf(&t).Elem()33 typeOfT := s.Type()34 for i := 0; i < s.NumField(); i++ {35 f := s.Field(i)36 fmt.Printf("%d: %s %s = %v37 typeOfT.Field(i).Name, f.Type(), f.Interface())38 }39}40import (41func main() {

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UnknownDecorator

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1import (2func main() {3 m := orderedmap.NewOrderedMap()4 m.Set("a", 1)5 m.Set("b", 2)6 m.Set("c", 3)7 m.Set("d", 4)8 m.Set("e", 5)9 fmt.Println(m.Get("b"))10 fmt.Println(m.Get("d"))11 fmt.Println(m.Get("c"))12 fmt.Println(m.Get("e"))13 fmt.Println(m.Get("a"))14 fmt.Println(m.Get("a"))15 fmt.Println(m.Get("b"))16 fmt.Println(m.Get("c"))17 fmt.Println(m.Get("d"))18 fmt.Println(m.Get("e"))19}

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UnknownDecorator

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1import (2type A struct {3}4func (a *A) UnknownDecorator() {5 fmt.Println("UnknownDecorator for A")6}7type B struct {8}9func (b *B) UnknownDecorator() {10 fmt.Println("UnknownDecorator for B")11}12func main() {13 a := new(A)14 av := reflect.ValueOf(a)15 method := av.MethodByName("UnknownDecorator")16 method.Call(nil)17 b := new(B)18 bv := reflect.ValueOf(b)19 method = bv.MethodByName("UnknownDecorator")20 method.Call(nil)21}

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UnknownDecorator

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1import (2type (3 types struct {4 }5 rtype struct {6 }7 typeAlg struct {8 hash func(unsafe.Pointer, uintptr) uintptr9 equal func(unsafe.Pointer, unsafe.Pointer) bool10 }11func (t *types) UnknownDecorator() string {12 return t.typ.UnknownDecorator()13}14func (t *rtype) UnknownDecorator() string {15 return fmt.Sprintf("%s %d %d %d %d", t.str.name(), t.size, t.ptrdata, t.align, t.fieldAlign)16}17func (n nameOff) name() string {

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