types

package
v0.10.4 Latest Latest
Warning

This package is not in the latest version of its module.

 Go to latest Published: Jan 5, 2023 License: Apache-2.0, BSD-3-Clause Imports: 25 Imported by: 422

Documentation

Overview

Package types contains the types, traits, and utilities common to all components of expression handling.

Index

Constants

View Source 
const (
	False = Bool(false)
	True  = Bool(true)
)

Boolean constants

View Source 
const (
	// IntZero is the zero-value for Int
	IntZero   = Int(0)
	IntOne    = Int(1)
	IntNegOne = Int(-1)
)

Int constants used for comparison results.

Variables

View Source 
var (
	// NullType singleton.
	NullType = NewTypeValue("null_type")
	// NullValue singleton.
	NullValue = Null(structpb.NullValue_NULL_VALUE)
)
View Source 
var (
	// BoolType singleton.
	BoolType = NewTypeValue("bool",
		traits.ComparerType,
		traits.NegatorType)
)
View Source 
var (
	// BytesType singleton.
	BytesType = NewTypeValue("bytes",
		traits.AdderType,
		traits.ComparerType,
		traits.SizerType)
)
View Source 
var (
	// DefaultTypeAdapter adapts canonical CEL types from their equivalent Go values.
	DefaultTypeAdapter = &defaultTypeAdapter{}
)
View Source 
var (
	// DoubleType singleton.
	DoubleType = NewTypeValue("double",
		traits.AdderType,
		traits.ComparerType,
		traits.DividerType,
		traits.MultiplierType,
		traits.NegatorType,
		traits.SubtractorType)
)
View Source 
var (
	// DurationType singleton.
	DurationType = NewTypeValue("google.protobuf.Duration",
		traits.AdderType,
		traits.ComparerType,
		traits.NegatorType,
		traits.ReceiverType,
		traits.SubtractorType)
)
View Source 
var (
	// ErrType singleton.
	ErrType = NewTypeValue("error")
)
View Source 
var (
	// IntType singleton.
	IntType = NewTypeValue("int",
		traits.AdderType,
		traits.ComparerType,
		traits.DividerType,
		traits.ModderType,
		traits.MultiplierType,
		traits.NegatorType,
		traits.SubtractorType)
)
View Source 
var (
	// IteratorType singleton.
	IteratorType = NewTypeValue("iterator", traits.IteratorType)
)
View Source 
var (
	// ListType singleton.
	ListType = NewTypeValue("list",
		traits.AdderType,
		traits.ContainerType,
		traits.IndexerType,
		traits.IterableType,
		traits.SizerType)
)
View Source 
var (
	// MapType singleton.
	MapType = NewTypeValue("map",
		traits.ContainerType,
		traits.IndexerType,
		traits.IterableType,
		traits.SizerType)
)
View Source 
var (
	// StringType singleton.
	StringType = NewTypeValue("string",
		traits.AdderType,
		traits.ComparerType,
		traits.MatcherType,
		traits.ReceiverType,
		traits.SizerType)
)
View Source 
var (
	// TimestampType singleton.
	TimestampType = NewTypeValue("google.protobuf.Timestamp",
		traits.AdderType,
		traits.ComparerType,
		traits.ReceiverType,
		traits.SubtractorType)
)
View Source 
var (
	// TypeType is the type of a TypeValue.
	TypeType = NewTypeValue("type")
)
View Source 
var (
	// UintType singleton.
	UintType = NewTypeValue("uint",
		traits.AdderType,
		traits.ComparerType,
		traits.DividerType,
		traits.ModderType,
		traits.MultiplierType,
		traits.SubtractorType)
)
View Source 
var (
	// UnknownType singleton.
	UnknownType = NewTypeValue("unknown")
)

Functions

func Equal added in v0.10.0 

func Equal(lhs ref.Val, rhs ref.Val) ref.Val

Equal returns whether the two ref.Value are heterogeneously equivalent.

func IsBool 

func IsBool(elem interface{}) bool

IsBool returns whether the input ref.Val or ref.Type is equal to BoolType.

func IsError 

func IsError(val ref.Val) bool

IsError returns whether the input element ref.Type or ref.Val is equal to the ErrType singleton.

func IsPrimitiveType added in v0.3.0 

func IsPrimitiveType(val ref.Val) bool

IsPrimitiveType returns whether the input element ref.Val is a primitive type. Note, primitive types do not include well-known types such as Duration and Timestamp.

func IsUnknown 

func IsUnknown(val ref.Val) bool

IsUnknown returns whether the element ref.Type or ref.Val is equal to the UnknownType singleton.

func IsUnknownOrError 

func IsUnknownOrError(val ref.Val) bool

IsUnknownOrError returns whether the input element ref.Val is an ErrType or UnknonwType.

func MaybeNoSuchOverloadErr added in v0.4.0 

func MaybeNoSuchOverloadErr(val ref.Val) ref.Val

MaybeNoSuchOverloadErr returns the error or unknown if the input ref.Val is one of these types, else a new no such overload error.

func NewDynamicList 

func NewDynamicList(adapter ref.TypeAdapter, value interface{}) traits.Lister

NewDynamicList returns a traits.Lister with heterogenous elements. value should be an array of "native" types, i.e. any type that NativeToValue() can convert to a ref.Val.

func NewDynamicMap 

func NewDynamicMap(adapter ref.TypeAdapter, value interface{}) traits.Mapper

NewDynamicMap returns a traits.Mapper value with dynamic key, value pairs.

func NewEmptyRegistry added in v0.4.0 

func NewEmptyRegistry() ref.TypeRegistry

NewEmptyRegistry returns a registry which is completely unconfigured.

func NewErr 

func NewErr(format string, args ...interface{}) ref.Val

NewErr creates a new Err described by the format string and args. TODO: Audit the use of this function and standardize the error messages and codes.

func NewJSONList 

func NewJSONList(adapter ref.TypeAdapter, l *structpb.ListValue) traits.Lister

NewJSONList returns a traits.Lister based on structpb.ListValue instance.

func NewJSONStruct 

func NewJSONStruct(adapter ref.TypeAdapter, value *structpb.Struct) traits.Mapper

NewJSONStruct creates a traits.Mapper implementation backed by a JSON struct that has been encoded in protocol buffer form.

The `adapter` argument provides type adaptation capabilities from proto to CEL.

func NewMutableList added in v0.10.0 

func NewMutableList(adapter ref.TypeAdapter) traits.Lister

NewMutableList creates a new mutable list whose internal state can be modified.

The mutable list only handles `Add` calls correctly as it is intended only for use within comprehension loops which generate an immutable result upon completion.

func NewObject 

func NewObject(adapter ref.TypeAdapter,
	typeDesc *pb.TypeDescription,
	typeValue *TypeValue,
	value proto.Message) ref.Val

NewObject returns an object based on a proto.Message value which handles conversion between protobuf type values and expression type values. Objects support indexing and iteration.

Note: the type value is pulled from the list of registered types within the type provider. If the proto type is not registered within the type provider, then this will result in an error within the type adapter / provider.

func NewProtoList added in v0.7.0 

func NewProtoList(adapter ref.TypeAdapter, list protoreflect.List) traits.Lister

NewProtoList returns a traits.Lister based on a pb.List instance.

func NewProtoMap added in v0.7.0 

func NewProtoMap(adapter ref.TypeAdapter, value *pb.Map) traits.Mapper

NewProtoMap returns a specialized traits.Mapper for handling protobuf map values.

func NewRefValList added in v0.7.0 

func NewRefValList(adapter ref.TypeAdapter, elems []ref.Val) traits.Lister

NewRefValList returns a traits.Lister with ref.Val elements.

This type specialization is used with list literals within CEL expressions.

func NewRefValMap added in v0.7.0 

func NewRefValMap(adapter ref.TypeAdapter, value map[ref.Val]ref.Val) traits.Mapper

NewRefValMap returns a specialized traits.Mapper with CEL valued keys and values.

func NewRegistry added in v0.2.0 

func NewRegistry(types ...proto.Message) (ref.TypeRegistry, error)

NewRegistry accepts a list of proto message instances and returns a type provider which can create new instances of the provided message or any message that proto depends upon in its FileDescriptor.

func NewStringInterfaceMap added in v0.7.0 

func NewStringInterfaceMap(adapter ref.TypeAdapter, value map[string]interface{}) traits.Mapper

NewStringInterfaceMap returns a specialized traits.Mapper with string keys and interface values.

func NewStringList 

func NewStringList(adapter ref.TypeAdapter, elems []string) traits.Lister

NewStringList returns a traits.Lister containing only strings.

func NewStringStringMap 

func NewStringStringMap(adapter ref.TypeAdapter, value map[string]string) traits.Mapper

NewStringStringMap returns a specialized traits.Mapper with string keys and values.

func NoSuchOverloadErr added in v0.4.0 

func NoSuchOverloadErr() ref.Val

NoSuchOverloadErr returns a new types.Err instance with a no such overload message.

func UnsupportedRefValConversionErr added in v0.7.0 

func UnsupportedRefValConversionErr(val interface{}) ref.Val

UnsupportedRefValConversionErr returns a types.NewErr instance with a no such conversion message that indicates that the native value could not be converted to a CEL ref.Val.

func ValOrErr 

func ValOrErr(val ref.Val, format string, args ...interface{}) ref.Val

ValOrErr either returns the existing error or create a new one. TODO: Audit the use of this function and standardize the error messages and codes.

Types

type Bool 

type Bool bool

Bool type that implements ref.Val and supports comparison and negation.

func (Bool) Compare 

func (b Bool) Compare(other ref.Val) ref.Val

Compare implements the traits.Comparer interface method.

func (Bool) ConvertToNative 

func (b Bool) ConvertToNative(typeDesc reflect.Type) (interface{}, error)

ConvertToNative implements the ref.Val interface method.

func (Bool) ConvertToType 

func (b Bool) ConvertToType(typeVal ref.Type) ref.Val

ConvertToType implements the ref.Val interface method.

func (Bool) Equal 

func (b Bool) Equal(other ref.Val) ref.Val

Equal implements the ref.Val interface method.

func (Bool) Negate 

func (b Bool) Negate() ref.Val

Negate implements the traits.Negater interface method.

func (Bool) Type 

func (b Bool) Type() ref.Type

Type implements the ref.Val interface method.

func (Bool) Value 

func (b Bool) Value() interface{}

Value implements the ref.Val interface method.

type Bytes 

type Bytes []byte

Bytes type that implements ref.Val and supports add, compare, and size operations.

func (Bytes) Add 

func (b Bytes) Add(other ref.Val) ref.Val

Add implements traits.Adder interface method by concatenating byte sequences.

func (Bytes) Compare 

func (b Bytes) Compare(other ref.Val) ref.Val

Compare implments traits.Comparer interface method by lexicographic ordering.

func (Bytes) ConvertToNative 

func (b Bytes) ConvertToNative(typeDesc reflect.Type) (interface{}, error)

ConvertToNative implements the ref.Val interface method.

func (Bytes) ConvertToType 

func (b Bytes) ConvertToType(typeVal ref.Type) ref.Val

ConvertToType implements the ref.Val interface method.

func (Bytes) Equal 

func (b Bytes) Equal(other ref.Val) ref.Val

Equal implements the ref.Val interface method.

func (Bytes) Size 

func (b Bytes) Size() ref.Val

Size implements the traits.Sizer interface method.

func (Bytes) Type 

func (b Bytes) Type() ref.Type

Type implements the ref.Val interface method.

func (Bytes) Value 

func (b Bytes) Value() interface{}

Value implements the ref.Val interface method.

type Double 

type Double float64

Double type that implements ref.Val, comparison, and mathematical operations.

func (Double) Add 

func (d Double) Add(other ref.Val) ref.Val

Add implements traits.Adder.Add.

func (Double) Compare 

func (d Double) Compare(other ref.Val) ref.Val

Compare implements traits.Comparer.Compare.

func (Double) ConvertToNative 

func (d Double) ConvertToNative(typeDesc reflect.Type) (interface{}, error)

ConvertToNative implements ref.Val.ConvertToNative.

func (Double) ConvertToType 

func (d Double) ConvertToType(typeVal ref.Type) ref.Val

ConvertToType implements ref.Val.ConvertToType.

func (Double) Divide 

func (d Double) Divide(other ref.Val) ref.Val

Divide implements traits.Divider.Divide.

func (Double) Equal 

func (d Double) Equal(other ref.Val) ref.Val

Equal implements ref.Val.Equal.

func (Double) Multiply 

func (d Double) Multiply(other ref.Val) ref.Val

Multiply implements traits.Multiplier.Multiply.

func (Double) Negate 

func (d Double) Negate() ref.Val

Negate implements traits.Negater.Negate.

func (Double) Subtract 

func (d Double) Subtract(subtrahend ref.Val) ref.Val

Subtract implements traits.Subtractor.Subtract.

func (Double) Type 

func (d Double) Type() ref.Type

Type implements ref.Val.Type.

func (Double) Value 

func (d Double) Value() interface{}

Value implements ref.Val.Value.

type Duration 

type Duration struct {
	time.Duration
}

Duration type that implements ref.Val and supports add, compare, negate, and subtract operators. This type is also a receiver which means it can participate in dispatch to receiver functions.

func (Duration) Add 

func (d Duration) Add(other ref.Val) ref.Val

Add implements traits.Adder.Add.

func (Duration) Compare 

func (d Duration) Compare(other ref.Val) ref.Val

Compare implements traits.Comparer.Compare.

func (Duration) ConvertToNative 

func (d Duration) ConvertToNative(typeDesc reflect.Type) (interface{}, error)

ConvertToNative implements ref.Val.ConvertToNative.

func (Duration) ConvertToType 

func (d Duration) ConvertToType(typeVal ref.Type) ref.Val

ConvertToType implements ref.Val.ConvertToType.

func (Duration) Equal 

func (d Duration) Equal(other ref.Val) ref.Val

Equal implements ref.Val.Equal.

func (Duration) Negate 

func (d Duration) Negate() ref.Val

Negate implements traits.Negater.Negate.

func (Duration) Receive 

func (d Duration) Receive(function string, overload string, args []ref.Val) ref.Val

Receive implements traits.Receiver.Receive.

func (Duration) Subtract 

func (d Duration) Subtract(subtrahend ref.Val) ref.Val

Subtract implements traits.Subtractor.Subtract.

func (Duration) Type 

func (d Duration) Type() ref.Type

Type implements ref.Val.Type.

func (Duration) Value 

func (d Duration) Value() interface{}

Value implements ref.Val.Value.

type Err 

type Err struct {
	// contains filtered or unexported fields
}

Err type which extends the built-in go error and implements ref.Val.

func (*Err) ConvertToNative 

func (e *Err) ConvertToNative(typeDesc reflect.Type) (interface{}, error)

ConvertToNative implements ref.Val.ConvertToNative.

func (*Err) ConvertToType 

func (e *Err) ConvertToType(typeVal ref.Type) ref.Val

ConvertToType implements ref.Val.ConvertToType.

func (*Err) Equal 

func (e *Err) Equal(other ref.Val) ref.Val

Equal implements ref.Val.Equal.

func (*Err) String 

func (e *Err) String() string

String implements fmt.Stringer.

func (*Err) Type 

func (e *Err) Type() ref.Type

Type implements ref.Val.Type.

func (*Err) Value 

func (e *Err) Value() interface{}

Value implements ref.Val.Value.

type Int 

type Int int64

Int type that implements ref.Val as well as comparison and math operators.

func (Int) Add 

func (i Int) Add(other ref.Val) ref.Val

Add implements traits.Adder.Add.

func (Int) Compare 

func (i Int) Compare(other ref.Val) ref.Val

Compare implements traits.Comparer.Compare.

func (Int) ConvertToNative 

func (i Int) ConvertToNative(typeDesc reflect.Type) (interface{}, error)

ConvertToNative implements ref.Val.ConvertToNative.

func (Int) ConvertToType 

func (i Int) ConvertToType(typeVal ref.Type) ref.Val

ConvertToType implements ref.Val.ConvertToType.

func (Int) Divide 

func (i Int) Divide(other ref.Val) ref.Val

Divide implements traits.Divider.Divide.

func (Int) Equal 

func (i Int) Equal(other ref.Val) ref.Val

Equal implements ref.Val.Equal.

func (Int) Modulo 

func (i Int) Modulo(other ref.Val) ref.Val

Modulo implements traits.Modder.Modulo.

func (Int) Multiply 

func (i Int) Multiply(other ref.Val) ref.Val

Multiply implements traits.Multiplier.Multiply.

func (Int) Negate 

func (i Int) Negate() ref.Val

Negate implements traits.Negater.Negate.

func (Int) Subtract 

func (i Int) Subtract(subtrahend ref.Val) ref.Val

Subtract implements traits.Subtractor.Subtract.

func (Int) Type 

func (i Int) Type() ref.Type

Type implements ref.Val.Type.

func (Int) Value 

func (i Int) Value() interface{}

Value implements ref.Val.Value.

type Null 

type Null structpb.NullValue

Null type implementation.

func (Null) ConvertToNative 

func (n Null) ConvertToNative(typeDesc reflect.Type) (interface{}, error)

ConvertToNative implements ref.Val.ConvertToNative.

func (Null) ConvertToType 

func (n Null) ConvertToType(typeVal ref.Type) ref.Val

ConvertToType implements ref.Val.ConvertToType.

func (Null) Equal 

func (n Null) Equal(other ref.Val) ref.Val

Equal implements ref.Val.Equal.

func (Null) Type 

func (n Null) Type() ref.Type

Type implements ref.Val.Type.

func (Null) Value 

func (n Null) Value() interface{}

Value implements ref.Val.Value.

type String 

type String string

String type implementation which supports addition, comparison, matching, and size functions.

func (String) Add 

func (s String) Add(other ref.Val) ref.Val

Add implements traits.Adder.Add.

func (String) Compare 

func (s String) Compare(other ref.Val) ref.Val

Compare implements traits.Comparer.Compare.

func (String) ConvertToNative 

func (s String) ConvertToNative(typeDesc reflect.Type) (interface{}, error)

ConvertToNative implements ref.Val.ConvertToNative.

func (String) ConvertToType 

func (s String) ConvertToType(typeVal ref.Type) ref.Val

ConvertToType implements ref.Val.ConvertToType.

func (String) Equal 

func (s String) Equal(other ref.Val) ref.Val

Equal implements ref.Val.Equal.

func (String) Match 

func (s String) Match(pattern ref.Val) ref.Val

Match implements traits.Matcher.Match.

func (String) Receive 

func (s String) Receive(function string, overload string, args []ref.Val) ref.Val

Receive implements traits.Reciever.Receive.

func (String) Size 

func (s String) Size() ref.Val

Size implements traits.Sizer.Size.

func (String) Type 

func (s String) Type() ref.Type

Type implements ref.Val.Type.

func (String) Value 

func (s String) Value() interface{}

Value implements ref.Val.Value.

type Timestamp 

type Timestamp struct {
	time.Time
}

Timestamp type implementation which supports add, compare, and subtract operations. Timestamps are also capable of participating in dynamic function dispatch to instance methods.

func (Timestamp) Add 

func (t Timestamp) Add(other ref.Val) ref.Val

Add implements traits.Adder.Add.

func (Timestamp) Compare 

func (t Timestamp) Compare(other ref.Val) ref.Val

Compare implements traits.Comparer.Compare.

func (Timestamp) ConvertToNative 

func (t Timestamp) ConvertToNative(typeDesc reflect.Type) (interface{}, error)

ConvertToNative implements ref.Val.ConvertToNative.

func (Timestamp) ConvertToType 

func (t Timestamp) ConvertToType(typeVal ref.Type) ref.Val

ConvertToType implements ref.Val.ConvertToType.

func (Timestamp) Equal 

func (t Timestamp) Equal(other ref.Val) ref.Val

Equal implements ref.Val.Equal.

func (Timestamp) Receive 

func (t Timestamp) Receive(function string, overload string, args []ref.Val) ref.Val

Receive implements traits.Reciever.Receive.

func (Timestamp) Subtract 

func (t Timestamp) Subtract(subtrahend ref.Val) ref.Val

Subtract implements traits.Subtractor.Subtract.

func (Timestamp) Type 

func (t Timestamp) Type() ref.Type

Type implements ref.Val.Type.

func (Timestamp) Value 

func (t Timestamp) Value() interface{}

Value implements ref.Val.Value.

type TypeValue 

type TypeValue struct {
	// contains filtered or unexported fields
}

TypeValue is an instance of a Value that describes a value's type.

func NewObjectTypeValue 

func NewObjectTypeValue(name string) *TypeValue

NewObjectTypeValue returns a *TypeValue based on the input name, which is annotated with the traits relevant to all objects.

func NewTypeValue 

func NewTypeValue(name string, traits ...int) *TypeValue

NewTypeValue returns *TypeValue which is both a ref.Type and ref.Val.

func (*TypeValue) ConvertToNative 

func (t *TypeValue) ConvertToNative(typeDesc reflect.Type) (interface{}, error)

ConvertToNative implements ref.Val.ConvertToNative.

func (*TypeValue) ConvertToType 

func (t *TypeValue) ConvertToType(typeVal ref.Type) ref.Val

ConvertToType implements ref.Val.ConvertToType.

func (*TypeValue) Equal 

func (t *TypeValue) Equal(other ref.Val) ref.Val

Equal implements ref.Val.Equal.

func (*TypeValue) HasTrait 

func (t *TypeValue) HasTrait(trait int) bool

HasTrait indicates whether the type supports the given trait. Trait codes are defined in the traits package, e.g. see traits.AdderType.

func (*TypeValue) String 

func (t *TypeValue) String() string

String implements fmt.Stringer.

func (*TypeValue) Type 

func (t *TypeValue) Type() ref.Type

Type implements ref.Val.Type.

func (*TypeValue) TypeName 

func (t *TypeValue) TypeName() string

TypeName gives the type's name as a string.

func (*TypeValue) Value 

func (t *TypeValue) Value() interface{}

Value implements ref.Val.Value.

type Uint 

type Uint uint64

Uint type implementation which supports comparison and math operators.

func (Uint) Add 

func (i Uint) Add(other ref.Val) ref.Val

Add implements traits.Adder.Add.

func (Uint) Compare 

func (i Uint) Compare(other ref.Val) ref.Val

Compare implements traits.Comparer.Compare.

func (Uint) ConvertToNative 

func (i Uint) ConvertToNative(typeDesc reflect.Type) (interface{}, error)

ConvertToNative implements ref.Val.ConvertToNative.

func (Uint) ConvertToType 

func (i Uint) ConvertToType(typeVal ref.Type) ref.Val

ConvertToType implements ref.Val.ConvertToType.

func (Uint) Divide 

func (i Uint) Divide(other ref.Val) ref.Val

Divide implements traits.Divider.Divide.

func (Uint) Equal 

func (i Uint) Equal(other ref.Val) ref.Val

Equal implements ref.Val.Equal.

func (Uint) Modulo 

func (i Uint) Modulo(other ref.Val) ref.Val

Modulo implements traits.Modder.Modulo.

func (Uint) Multiply 

func (i Uint) Multiply(other ref.Val) ref.Val

Multiply implements traits.Multiplier.Multiply.

func (Uint) Subtract 

func (i Uint) Subtract(subtrahend ref.Val) ref.Val

Subtract implements traits.Subtractor.Subtract.

func (Uint) Type 

func (i Uint) Type() ref.Type

Type implements ref.Val.Type.

func (Uint) Value 

func (i Uint) Value() interface{}

Value implements ref.Val.Value.

type Unknown 

type Unknown []int64

Unknown type implementation which collects expression ids which caused the current value to become unknown.

func (Unknown) ConvertToNative 

func (u Unknown) ConvertToNative(typeDesc reflect.Type) (interface{}, error)

ConvertToNative implements ref.Val.ConvertToNative.

func (Unknown) ConvertToType 

func (u Unknown) ConvertToType(typeVal ref.Type) ref.Val

ConvertToType implements ref.Val.ConvertToType.

func (Unknown) Equal 

func (u Unknown) Equal(other ref.Val) ref.Val

Equal implements ref.Val.Equal.

func (Unknown) Type 

func (u Unknown) Type() ref.Type

Type implements ref.Val.Type.

func (Unknown) Value 

func (u Unknown) Value() interface{}

Value implements ref.Val.Value.

Source Files

View all Source files

Directories

Path Synopsis
Package pb reflects over protocol buffer descriptors to generate objects that simplify type, enum, and field lookup.
 Package pb reflects over protocol buffer descriptors to generate objects that simplify type, enum, and field lookup.
Package ref contains the reference interfaces used throughout the types components.
 Package ref contains the reference interfaces used throughout the types components.
Package traits defines interfaces that a type may implement to participate in operator overloads and function dispatch.
 Package traits defines interfaces that a type may implement to participate in operator overloads and function dispatch.

Jump to

Keyboard shortcuts

? : This menu
/ : Search site
f or F : Jump to
y or Y : Canonical URL
go.dev uses cookies from Google to deliver and enhance the quality of its services and to analyze traffic. Learn more.