jsoner

package module
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 Go to latest Published: Mar 7, 2022 License: MIT Imports: 18 Imported by: 1

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License

A thread-safe, minimal API fork of the high-performance Json-Iterator.

Documentation

Overview

package jsoner implements encoding and decoding of JSON as defined in RFC 4627 and provides interfaces with identical syntax of standard lib encoding/json. Converting from encoding/json to jsoner is no more than replacing the package with jsoner and variable type declarations (if any). jsoner interfaces gives 100% compatibility with code using standard lib.

"JSON and Go" (https://golang.org/doc/articles/json_and_go.html) gives a description of how Marshal/Unmarshal operate between arbitrary or predefined json objects and bytes, and it applies to jsoner.Marshal/Unmarshal as well.

Besides, jsoner.Iterator provides a different set of interfaces iterating given bytes/string/reader and yielding parsed elements one by one. This set of interfaces reads input as required and gives better performance.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func CastJsonNumber 

func CastJsonNumber(val interface{}) (string, bool)

Types

type API 

type API interface {
	IteratorPool
	StreamPool
	MarshalToString(v interface{}) (string, error)
	Marshal(v interface{}) ([]byte, error)
	MarshalIndent(v interface{}, prefix, indent string) ([]byte, error)
	UnmarshalFromString(str string, v interface{}) error
	Unmarshal(data []byte, v interface{}) error
	Get(data []byte, path ...interface{}) Any
	RegisterExtension(extension Extension)
	RegisterFieldEncoderFunc(typ string, field string, fun EncoderFunc, isEmptyFunc func(unsafe.Pointer) bool)
	RegisterFieldEncoder(typ string, field string, encoder ValEncoder)
	RegisterTypeEncoder(typ string, encoder ValEncoder)
	RegisterTypeEncoderFunc(typ string, fun EncoderFunc, isEmptyFunc func(unsafe.Pointer) bool)
	RegisterTypeDecoderFunc(typ string, fun DecoderFunc)
	RegisterTypeDecoder(typ string, decoder ValDecoder)
	RegisterFieldDecoderFunc(typ string, field string, fun DecoderFunc)
	RegisterFieldDecoder(typ string, field string, decoder ValDecoder)
	ClearExtensions()
	ClearDecoders()
	ClearEncoders()
	DecoderOf(typ reflect2.Type) ValDecoder
	EncoderOf(typ reflect2.Type) ValEncoder
}

API the public interface of this package. Primary Marshal and Unmarshal.

func CompatibleAPI 

func CompatibleAPI() API

CompatibleAPI tries to be 100% compatible with standard library behavior

func DefaultAPI 

func DefaultAPI() API

DefaultAPI returns the default API

func FastestAPI 

func FastestAPI() API

FastestAPI marshals float with only 6 digits precision

type Any 

type Any interface {
	LastError() error
	ValueType() ValueType
	MustBeValid() Any
	ToBool() bool
	ToInt() int
	ToInt32() int32
	ToInt64() int64
	ToUint() uint
	ToUint32() uint32
	ToUint64() uint64
	ToFloat32() float32
	ToFloat64() float64
	ToString() string
	ToVal(val interface{})
	Get(path ...interface{}) Any
	Size() int
	Keys() []string
	GetInterface() interface{}
	WriteTo(stream *Stream)
}

Any generic object representation. The lazy json implementation holds []byte and parse lazily.

func Wrap 

func Wrap(val interface{}) Any

Wrap turn a go object into Any interface

func WrapFloat64 

func WrapFloat64(val float64) Any

WrapFloat64 turn float64 into Any interface

func WrapInt32 

func WrapInt32(val int32) Any

WrapInt32 turn int32 into Any interface

func WrapInt64 

func WrapInt64(val int64) Any

WrapInt64 turn int64 into Any interface

func WrapString 

func WrapString(val string) Any

WrapString turn string into Any interface

func WrapUint32 

func WrapUint32(val uint32) Any

WrapUint32 turn uint32 into Any interface

func WrapUint64 

func WrapUint64(val uint64) Any

WrapUint64 turn uint64 into Any interface

type Binding 

type Binding struct {
	Field     reflect2.StructField
	FromNames []string
	ToNames   []string
	Encoder   ValEncoder
	Decoder   ValDecoder
	// contains filtered or unexported fields
}

Binding describe how should we encode/decode the struct field

type Config 

type Config struct {
	IndentionStep                 int
	MarshalFloatWith6Digits       bool
	EscapeHTML                    bool
	SortMapKeys                   bool
	UseNumber                     bool
	DisallowUnknownFields         bool
	TagKey                        string
	OnlyTaggedField               bool
	ValidateJsonRawMessage        bool
	ObjectFieldMustBeSimpleString bool
	CaseSensitive                 bool
}

Config customize how the API should behave. The API is created from Config by Froze.

func (Config) Froze 

func (cfg Config) Froze() API

Froze forge API from config

type DecoderExtension 

type DecoderExtension map[reflect2.Type]ValDecoder

func (DecoderExtension) CreateDecoder 

func (extension DecoderExtension) CreateDecoder(typ reflect2.Type) ValDecoder

CreateDecoder get decoder from map

func (DecoderExtension) CreateEncoder 

func (extension DecoderExtension) CreateEncoder(typ reflect2.Type) ValEncoder

CreateEncoder No-op

func (DecoderExtension) CreateMapKeyDecoder 

func (extension DecoderExtension) CreateMapKeyDecoder(typ reflect2.Type) ValDecoder

CreateMapKeyDecoder No-op

func (DecoderExtension) CreateMapKeyEncoder 

func (extension DecoderExtension) CreateMapKeyEncoder(typ reflect2.Type) ValEncoder

CreateMapKeyEncoder No-op

func (DecoderExtension) DecorateDecoder 

func (extension DecoderExtension) DecorateDecoder(typ reflect2.Type, decoder ValDecoder) ValDecoder

DecorateDecoder No-op

func (DecoderExtension) DecorateEncoder 

func (extension DecoderExtension) DecorateEncoder(typ reflect2.Type, encoder ValEncoder) ValEncoder

DecorateEncoder No-op

func (DecoderExtension) UpdateStructDescriptor 

func (extension DecoderExtension) UpdateStructDescriptor(structDescriptor *StructDescriptor)

UpdateStructDescriptor No-op

type DecoderFunc 

type DecoderFunc func(ptr unsafe.Pointer, iter *Iterator)

DecoderFunc the function form of TypeDecoder

type DummyExtension 

type DummyExtension struct {
}

DummyExtension embed this type get dummy implementation for all methods of Extension

func (*DummyExtension) CreateDecoder 

func (extension *DummyExtension) CreateDecoder(typ reflect2.Type) ValDecoder

CreateDecoder No-op

func (*DummyExtension) CreateEncoder 

func (extension *DummyExtension) CreateEncoder(typ reflect2.Type) ValEncoder

CreateEncoder No-op

func (*DummyExtension) CreateMapKeyDecoder 

func (extension *DummyExtension) CreateMapKeyDecoder(typ reflect2.Type) ValDecoder

CreateMapKeyDecoder No-op

func (*DummyExtension) CreateMapKeyEncoder 

func (extension *DummyExtension) CreateMapKeyEncoder(typ reflect2.Type) ValEncoder

CreateMapKeyEncoder No-op

func (*DummyExtension) DecorateDecoder 

func (extension *DummyExtension) DecorateDecoder(typ reflect2.Type, decoder ValDecoder) ValDecoder

DecorateDecoder No-op

func (*DummyExtension) DecorateEncoder 

func (extension *DummyExtension) DecorateEncoder(typ reflect2.Type, encoder ValEncoder) ValEncoder

DecorateEncoder No-op

func (*DummyExtension) UpdateStructDescriptor 

func (extension *DummyExtension) UpdateStructDescriptor(structDescriptor *StructDescriptor)

UpdateStructDescriptor No-op

type EncoderExtension 

type EncoderExtension map[reflect2.Type]ValEncoder

func (EncoderExtension) CreateDecoder 

func (extension EncoderExtension) CreateDecoder(typ reflect2.Type) ValDecoder

CreateDecoder No-op

func (EncoderExtension) CreateEncoder 

func (extension EncoderExtension) CreateEncoder(typ reflect2.Type) ValEncoder

CreateEncoder get encoder from map

func (EncoderExtension) CreateMapKeyDecoder 

func (extension EncoderExtension) CreateMapKeyDecoder(typ reflect2.Type) ValDecoder

CreateMapKeyDecoder No-op

func (EncoderExtension) CreateMapKeyEncoder 

func (extension EncoderExtension) CreateMapKeyEncoder(typ reflect2.Type) ValEncoder

CreateMapKeyEncoder No-op

func (EncoderExtension) DecorateDecoder 

func (extension EncoderExtension) DecorateDecoder(typ reflect2.Type, decoder ValDecoder) ValDecoder

DecorateDecoder No-op

func (EncoderExtension) DecorateEncoder 

func (extension EncoderExtension) DecorateEncoder(typ reflect2.Type, encoder ValEncoder) ValEncoder

DecorateEncoder No-op

func (EncoderExtension) UpdateStructDescriptor 

func (extension EncoderExtension) UpdateStructDescriptor(structDescriptor *StructDescriptor)

UpdateStructDescriptor No-op

type EncoderFunc 

type EncoderFunc func(ptr unsafe.Pointer, stream *Stream)

EncoderFunc the function form of TypeEncoder

type Extension 

type Extension interface {
	UpdateStructDescriptor(structDescriptor *StructDescriptor)
	CreateMapKeyDecoder(typ reflect2.Type) ValDecoder
	CreateMapKeyEncoder(typ reflect2.Type) ValEncoder
	CreateDecoder(typ reflect2.Type) ValDecoder
	CreateEncoder(typ reflect2.Type) ValEncoder
	DecorateDecoder(typ reflect2.Type, decoder ValDecoder) ValDecoder
	DecorateEncoder(typ reflect2.Type, encoder ValEncoder) ValEncoder
}

Extension the one for all SPI. Customize encoding/decoding by specifying alternate encoder/decoder. Can also rename fields by UpdateStructDescriptor.

type IsEmbeddedPtrNil 

type IsEmbeddedPtrNil interface {
	IsEmbeddedPtrNil(ptr unsafe.Pointer) bool
}

type Iterator 

type Iterator struct {
	Error      error
	Attachment interface{} // open for customized decoder
	// contains filtered or unexported fields
}

Iterator is a io.Reader like object, with JSON specific read functions. Error is not returned as return value, but stored as Error member on this iterator instance.

func NewIterator 

func NewIterator(cfg API) *Iterator

NewIterator creates an empty Iterator instance

func Parse 

func Parse(cfg API, reader io.Reader, bufSize int) *Iterator

Parse creates an Iterator instance from io.Reader

func ParseBytes 

func ParseBytes(cfg API, input []byte) *Iterator

ParseBytes creates an Iterator instance from byte array

func ParseString 

func ParseString(cfg API, input string) *Iterator

ParseString creates an Iterator instance from string

func (*Iterator) CurrentBuffer 

func (iter *Iterator) CurrentBuffer() string

CurrentBuffer gets current buffer as string for debugging purpose

func (*Iterator) Pool 

func (iter *Iterator) Pool() IteratorPool

Pool returns a pool can provide more iterator with same configuration

func (*Iterator) Read 

func (iter *Iterator) Read() interface{}

Read read the next JSON element as generic interface{}.

func (*Iterator) ReadAny 

func (iter *Iterator) ReadAny() Any

ReadAny read next JSON element as an Any object. It is a better json.RawMessage.

func (*Iterator) ReadArray 

func (iter *Iterator) ReadArray() (ret bool)

ReadArray read array element, tells if the array has more element to read.

func (*Iterator) ReadArrayCB 

func (iter *Iterator) ReadArrayCB(callback func(*Iterator) bool) (ret bool)

ReadArrayCB read array with callback

func (*Iterator) ReadBigFloat 

func (iter *Iterator) ReadBigFloat() (ret *big.Float)

ReadBigFloat read big.Float

func (*Iterator) ReadBigInt 

func (iter *Iterator) ReadBigInt() (ret *big.Int)

ReadBigInt read big.Int

func (*Iterator) ReadBool 

func (iter *Iterator) ReadBool() (ret bool)

ReadBool reads a json object as BoolValue

func (*Iterator) ReadFloat32 

func (iter *Iterator) ReadFloat32() (ret float32)

ReadFloat32 read float32

func (*Iterator) ReadFloat64 

func (iter *Iterator) ReadFloat64() (ret float64)

ReadFloat64 read float64

func (*Iterator) ReadInt 

func (iter *Iterator) ReadInt() int

ReadInt read int

func (*Iterator) ReadInt16 

func (iter *Iterator) ReadInt16() (ret int16)

ReadInt16 read int16

func (*Iterator) ReadInt32 

func (iter *Iterator) ReadInt32() (ret int32)

ReadInt32 read int32

func (*Iterator) ReadInt64 

func (iter *Iterator) ReadInt64() (ret int64)

ReadInt64 read int64

func (*Iterator) ReadInt8 

func (iter *Iterator) ReadInt8() (ret int8)

ReadInt8 read int8

func (*Iterator) ReadMapCB 

func (iter *Iterator) ReadMapCB(callback func(*Iterator, string) bool) bool

ReadMapCB read map with callback, the key can be any string

func (*Iterator) ReadNil 

func (iter *Iterator) ReadNil() (ret bool)

ReadNil reads a json object as nil and returns whether it's a nil or not

func (*Iterator) ReadNumber 

func (iter *Iterator) ReadNumber() (ret json.Number)

ReadNumber read json.Number

func (*Iterator) ReadObject 

func (iter *Iterator) ReadObject() (ret string)

ReadObject read one field from object. If object ended, returns empty string. Otherwise, returns the field name.

func (*Iterator) ReadObjectCB 

func (iter *Iterator) ReadObjectCB(callback func(*Iterator, string) bool) bool

ReadObjectCB read object with callback, the key is ascii only and field name not copied

func (*Iterator) ReadString 

func (iter *Iterator) ReadString() (ret string)

ReadString read string from iterator

func (*Iterator) ReadStringAsSlice 

func (iter *Iterator) ReadStringAsSlice() (ret []byte)

ReadStringAsSlice read string from iterator without copying into string form. The []byte can not be kept, as it will change after next iterator call.

func (*Iterator) ReadUint 

func (iter *Iterator) ReadUint() uint

ReadUint read uint

func (*Iterator) ReadUint16 

func (iter *Iterator) ReadUint16() (ret uint16)

ReadUint16 read uint16

func (*Iterator) ReadUint32 

func (iter *Iterator) ReadUint32() (ret uint32)

ReadUint32 read uint32

func (*Iterator) ReadUint64 

func (iter *Iterator) ReadUint64() uint64

ReadUint64 read uint64

func (*Iterator) ReadUint8 

func (iter *Iterator) ReadUint8() (ret uint8)

ReadUint8 read uint8

func (*Iterator) ReadVal 

func (iter *Iterator) ReadVal(obj interface{})

ReadVal copy the underlying JSON into go interface, same as json.Unmarshal

func (*Iterator) ReportError 

func (iter *Iterator) ReportError(operation string, msg string)

ReportError record a error in iterator instance with current position.

func (*Iterator) Reset 

func (iter *Iterator) Reset(reader io.Reader) *Iterator

Reset reuse iterator instance by specifying another reader

func (*Iterator) ResetBytes 

func (iter *Iterator) ResetBytes(input []byte) *Iterator

ResetBytes reuse iterator instance by specifying another byte array as input

func (*Iterator) Skip 

func (iter *Iterator) Skip()

Skip skips a json object and positions to relatively the next json object

func (*Iterator) SkipAndAppendBytes 

func (iter *Iterator) SkipAndAppendBytes(buf []byte) []byte

SkipAndAppendBytes skips next JSON element and appends its content to buffer, returning the result.

func (*Iterator) SkipAndReturnBytes 

func (iter *Iterator) SkipAndReturnBytes() []byte

SkipAndReturnBytes skip next JSON element, and return its content as []byte. The []byte can be kept, it is a copy of data.

func (*Iterator) WhatIsNext 

func (iter *Iterator) WhatIsNext() ValueType

WhatIsNext gets ValueType of relatively next json element

type IteratorPool 

type IteratorPool interface {
	BorrowIterator(data []byte) *Iterator
	ReturnIterator(iter *Iterator)
}

IteratorPool a thread safe pool of iterators with same configuration

type Map 

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

func NewMap 

func NewMap() *Map

NewMap creates a thread safe map

func (*Map) Load 

func (m *Map) Load(key interface{}) (elem interface{}, found bool)

Load is same as sync.Map Load

func (*Map) Store 

func (m *Map) Store(key interface{}, elem interface{})

Store is same as sync.Map Store

type Number 

type Number string

func (Number) Float64 

func (n Number) Float64() (float64, error)

Float64 returns the number as a float64.

func (Number) Int64 

func (n Number) Int64() (int64, error)

Int64 returns the number as an int64.

func (Number) String 

func (n Number) String() string

String returns the literal text of the number.

type OptionalDecoder 

type OptionalDecoder struct {
	ValueType    reflect2.Type
	ValueDecoder ValDecoder
}

func (*OptionalDecoder) Decode 

func (decoder *OptionalDecoder) Decode(ptr unsafe.Pointer, iter *Iterator)

type OptionalEncoder 

type OptionalEncoder struct {
	ValueEncoder ValEncoder
}

func (*OptionalEncoder) Encode 

func (encoder *OptionalEncoder) Encode(ptr unsafe.Pointer, stream *Stream)

func (*OptionalEncoder) IsEmpty 

func (encoder *OptionalEncoder) IsEmpty(ptr unsafe.Pointer) bool

type RawMessage 

type RawMessage []byte

type Stream 

type Stream struct {
	Error error

	Attachment interface{} // open for customized encoder
	// contains filtered or unexported fields
}

stream is a io.Writer like object, with JSON specific write functions. Error is not returned as return value, but stored as Error member on this stream instance.

func NewStream 

func NewStream(cfg API, out io.Writer, bufSize int) *Stream

NewStream create new stream instance. cfg can be jsoner.ConfigDefault. out can be nil if write to internal buffer. bufSize is the initial size for the internal buffer in bytes.

func (*Stream) Available 

func (stream *Stream) Available() int

Available returns how many bytes are unused in the buffer.

func (*Stream) Buffer 

func (stream *Stream) Buffer() []byte

Buffer if writer is nil, use this method to take the result

func (*Stream) Buffered 

func (stream *Stream) Buffered() int

Buffered returns the number of bytes that have been written into the current buffer.

func (*Stream) Flush 

func (stream *Stream) Flush() error

Flush writes any buffered data to the underlying io.Writer.

func (*Stream) Pool 

func (stream *Stream) Pool() StreamPool

Pool returns a pool can provide more stream with same configuration

func (*Stream) Reset 

func (stream *Stream) Reset(out io.Writer)

Reset reuse this stream instance by assign a new writer

func (*Stream) SetBuffer 

func (stream *Stream) SetBuffer(buf []byte)

SetBuffer allows to append to the internal buffer directly

func (*Stream) Write 

func (stream *Stream) Write(p []byte) (nn int, err error)

Write writes the contents of p into the buffer. It returns the number of bytes written. If nn < len(p), it also returns an error explaining why the write is short.

func (*Stream) WriteArrayEnd 

func (stream *Stream) WriteArrayEnd()

WriteArrayEnd write ] with possible indention

func (*Stream) WriteArrayStart 

func (stream *Stream) WriteArrayStart()

WriteArrayStart write [ with possible indention

func (*Stream) WriteBool 

func (stream *Stream) WriteBool(val bool)

WriteBool write true or false into stream

func (*Stream) WriteEmptyArray 

func (stream *Stream) WriteEmptyArray()

WriteEmptyArray write []

func (*Stream) WriteEmptyObject 

func (stream *Stream) WriteEmptyObject()

WriteEmptyObject write {}

func (*Stream) WriteFalse 

func (stream *Stream) WriteFalse()

WriteFalse write false to stream

func (*Stream) WriteFloat32 

func (stream *Stream) WriteFloat32(val float32)

WriteFloat32 write float32 to stream

func (*Stream) WriteFloat32Lossy 

func (stream *Stream) WriteFloat32Lossy(val float32)

WriteFloat32Lossy write float32 to stream with ONLY 6 digits precision although much much faster

func (*Stream) WriteFloat64 

func (stream *Stream) WriteFloat64(val float64)

WriteFloat64 write float64 to stream

func (*Stream) WriteFloat64Lossy 

func (stream *Stream) WriteFloat64Lossy(val float64)

WriteFloat64Lossy write float64 to stream with ONLY 6 digits precision although much much faster

func (*Stream) WriteInt 

func (stream *Stream) WriteInt(val int)

WriteInt write int to stream

func (*Stream) WriteInt16 

func (stream *Stream) WriteInt16(nval int16)

WriteInt16 write int16 to stream

func (*Stream) WriteInt32 

func (stream *Stream) WriteInt32(nval int32)

WriteInt32 write int32 to stream

func (*Stream) WriteInt64 

func (stream *Stream) WriteInt64(nval int64)

WriteInt64 write int64 to stream

func (*Stream) WriteInt8 

func (stream *Stream) WriteInt8(nval int8)

WriteInt8 write int8 to stream

func (*Stream) WriteMore 

func (stream *Stream) WriteMore()

WriteMore write , with possible indention

func (*Stream) WriteNil 

func (stream *Stream) WriteNil()

WriteNil write null to stream

func (*Stream) WriteObjectEnd 

func (stream *Stream) WriteObjectEnd()

WriteObjectEnd write } with possible indention

func (*Stream) WriteObjectField 

func (stream *Stream) WriteObjectField(field string)

WriteObjectField write "field": with possible indention

func (*Stream) WriteObjectStart 

func (stream *Stream) WriteObjectStart()

WriteObjectStart write { with possible indention

func (*Stream) WriteRaw 

func (stream *Stream) WriteRaw(s string)

WriteRaw write string out without quotes, just like []byte

func (*Stream) WriteString 

func (stream *Stream) WriteString(s string)

WriteString write string to stream without html escape

func (*Stream) WriteStringWithHTMLEscaped 

func (stream *Stream) WriteStringWithHTMLEscaped(s string)

WriteStringWithHTMLEscaped write string to stream with html special characters escaped

func (*Stream) WriteTrue 

func (stream *Stream) WriteTrue()

WriteTrue write true to stream

func (*Stream) WriteUint 

func (stream *Stream) WriteUint(val uint)

WriteUint write uint to stream

func (*Stream) WriteUint16 

func (stream *Stream) WriteUint16(val uint16)

WriteUint16 write uint16 to stream

func (*Stream) WriteUint32 

func (stream *Stream) WriteUint32(val uint32)

WriteUint32 write uint32 to stream

func (*Stream) WriteUint64 

func (stream *Stream) WriteUint64(val uint64)

WriteUint64 write uint64 to stream

func (*Stream) WriteUint8 

func (stream *Stream) WriteUint8(val uint8)

WriteUint8 write uint8 to stream

func (*Stream) WriteVal 

func (stream *Stream) WriteVal(val interface{})

WriteVal copy the go interface into underlying JSON, same as json.Marshal

type StreamPool 

type StreamPool interface {
	BorrowStream(writer io.Writer) *Stream
	ReturnStream(stream *Stream)
}

StreamPool a thread safe pool of streams with same configuration

type StructDescriptor 

type StructDescriptor struct {
	Type   reflect2.Type
	Fields []*Binding
}

StructDescriptor describe how should we encode/decode the struct

func (*StructDescriptor) GetField 

func (structDescriptor *StructDescriptor) GetField(fieldName string) *Binding

GetField get one field from the descriptor by its name. Can not use map here to keep field orders.

type ValDecoder 

type ValDecoder interface {
	Decode(ptr unsafe.Pointer, iter *Iterator)
}

ValDecoder is an internal type registered to cache as needed. Don't confuse jsoner.ValDecoder with json.Decoder. For json.Decoder's adapter, refer to jsoner.AdapterDecoder(todo link).

Reflection on type to create decoders, which is then cached Reflection on value is avoided as we can, as the reflect.Value itself will allocate, with following exceptions 1. create instance of new value, for example *int will need a int to be allocated 2. append to slice, if the existing cap is not enough, allocate will be done using Reflect.New 3. assignment to map, both key and value will be reflect.Value For a simple struct binding, it will be reflect.Value free and allocation free

type ValEncoder 

type ValEncoder interface {
	IsEmpty(ptr unsafe.Pointer) bool
	Encode(ptr unsafe.Pointer, stream *Stream)
}

ValEncoder is an internal type registered to cache as needed. Don't confuse jsoner.ValEncoder with json.Encoder. For json.Encoder's adapter, refer to jsoner.AdapterEncoder(todo godoc link).

type ValueType 

type ValueType int

ValueType the type for JSON element 

const (
	// InvalidValue invalid JSON element
	InvalidValue ValueType = iota
	// StringValue JSON element "string"
	StringValue
	// NumberValue JSON element 100 or 0.10
	NumberValue
	// NilValue JSON element null
	NilValue
	// BoolValue JSON element true or false
	BoolValue
	// ArrayValue JSON element []
	ArrayValue
	// ObjectValue JSON element {}
	ObjectValue
)

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