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- package jsoniter
- import (
- "fmt"
- "reflect"
- "unsafe"
- "github.com/modern-go/reflect2"
- )
- // ValDecoder is an internal type registered to cache as needed.
- // Don't confuse jsoniter.ValDecoder with json.Decoder.
- // For json.Decoder's adapter, refer to jsoniter.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 ValDecoder interface {
- Decode(ptr unsafe.Pointer, iter *Iterator)
- }
- // ValEncoder is an internal type registered to cache as needed.
- // Don't confuse jsoniter.ValEncoder with json.Encoder.
- // For json.Encoder's adapter, refer to jsoniter.AdapterEncoder(todo godoc link).
- type ValEncoder interface {
- IsEmpty(ptr unsafe.Pointer) bool
- Encode(ptr unsafe.Pointer, stream *Stream)
- }
- type checkIsEmpty interface {
- IsEmpty(ptr unsafe.Pointer) bool
- }
- type ctx struct {
- *frozenConfig
- prefix string
- encoders map[reflect2.Type]ValEncoder
- decoders map[reflect2.Type]ValDecoder
- }
- func (b *ctx) caseSensitive() bool {
- if b.frozenConfig == nil {
- // default is case-insensitive
- return false
- }
- return b.frozenConfig.caseSensitive
- }
- func (b *ctx) append(prefix string) *ctx {
- return &ctx{
- frozenConfig: b.frozenConfig,
- prefix: b.prefix + " " + prefix,
- encoders: b.encoders,
- decoders: b.decoders,
- }
- }
- // ReadVal copy the underlying JSON into go interface, same as json.Unmarshal
- func (iter *Iterator) ReadVal(obj interface{}) {
- cacheKey := reflect2.RTypeOf(obj)
- decoder := iter.cfg.getDecoderFromCache(cacheKey)
- if decoder == nil {
- typ := reflect2.TypeOf(obj)
- if typ.Kind() != reflect.Ptr {
- iter.ReportError("ReadVal", "can only unmarshal into pointer")
- return
- }
- decoder = iter.cfg.DecoderOf(typ)
- }
- ptr := reflect2.PtrOf(obj)
- if ptr == nil {
- iter.ReportError("ReadVal", "can not read into nil pointer")
- return
- }
- decoder.Decode(ptr, iter)
- }
- // WriteVal copy the go interface into underlying JSON, same as json.Marshal
- func (stream *Stream) WriteVal(val interface{}) {
- if nil == val {
- stream.WriteNil()
- return
- }
- cacheKey := reflect2.RTypeOf(val)
- encoder := stream.cfg.getEncoderFromCache(cacheKey)
- if encoder == nil {
- typ := reflect2.TypeOf(val)
- encoder = stream.cfg.EncoderOf(typ)
- }
- encoder.Encode(reflect2.PtrOf(val), stream)
- }
- func (cfg *frozenConfig) DecoderOf(typ reflect2.Type) ValDecoder {
- cacheKey := typ.RType()
- decoder := cfg.getDecoderFromCache(cacheKey)
- if decoder != nil {
- return decoder
- }
- ctx := &ctx{
- frozenConfig: cfg,
- prefix: "",
- decoders: map[reflect2.Type]ValDecoder{},
- encoders: map[reflect2.Type]ValEncoder{},
- }
- ptrType := typ.(*reflect2.UnsafePtrType)
- decoder = decoderOfType(ctx, ptrType.Elem())
- cfg.addDecoderToCache(cacheKey, decoder)
- return decoder
- }
- func decoderOfType(ctx *ctx, typ reflect2.Type) ValDecoder {
- decoder := getTypeDecoderFromExtension(ctx, typ)
- if decoder != nil {
- return decoder
- }
- decoder = createDecoderOfType(ctx, typ)
- for _, extension := range extensions {
- decoder = extension.DecorateDecoder(typ, decoder)
- }
- decoder = ctx.decoderExtension.DecorateDecoder(typ, decoder)
- for _, extension := range ctx.extraExtensions {
- decoder = extension.DecorateDecoder(typ, decoder)
- }
- return decoder
- }
- func createDecoderOfType(ctx *ctx, typ reflect2.Type) ValDecoder {
- decoder := ctx.decoders[typ]
- if decoder != nil {
- return decoder
- }
- placeholder := &placeholderDecoder{}
- ctx.decoders[typ] = placeholder
- decoder = _createDecoderOfType(ctx, typ)
- placeholder.decoder = decoder
- return decoder
- }
- func _createDecoderOfType(ctx *ctx, typ reflect2.Type) ValDecoder {
- decoder := createDecoderOfJsonRawMessage(ctx, typ)
- if decoder != nil {
- return decoder
- }
- decoder = createDecoderOfJsonNumber(ctx, typ)
- if decoder != nil {
- return decoder
- }
- decoder = createDecoderOfMarshaler(ctx, typ)
- if decoder != nil {
- return decoder
- }
- decoder = createDecoderOfAny(ctx, typ)
- if decoder != nil {
- return decoder
- }
- decoder = createDecoderOfNative(ctx, typ)
- if decoder != nil {
- return decoder
- }
- switch typ.Kind() {
- case reflect.Interface:
- ifaceType, isIFace := typ.(*reflect2.UnsafeIFaceType)
- if isIFace {
- return &ifaceDecoder{valType: ifaceType}
- }
- return &efaceDecoder{}
- case reflect.Struct:
- return decoderOfStruct(ctx, typ)
- case reflect.Array:
- return decoderOfArray(ctx, typ)
- case reflect.Slice:
- return decoderOfSlice(ctx, typ)
- case reflect.Map:
- return decoderOfMap(ctx, typ)
- case reflect.Ptr:
- return decoderOfOptional(ctx, typ)
- default:
- return &lazyErrorDecoder{err: fmt.Errorf("%s%s is unsupported type", ctx.prefix, typ.String())}
- }
- }
- func (cfg *frozenConfig) EncoderOf(typ reflect2.Type) ValEncoder {
- cacheKey := typ.RType()
- encoder := cfg.getEncoderFromCache(cacheKey)
- if encoder != nil {
- return encoder
- }
- ctx := &ctx{
- frozenConfig: cfg,
- prefix: "",
- decoders: map[reflect2.Type]ValDecoder{},
- encoders: map[reflect2.Type]ValEncoder{},
- }
- encoder = encoderOfType(ctx, typ)
- if typ.LikePtr() {
- encoder = &onePtrEncoder{encoder}
- }
- cfg.addEncoderToCache(cacheKey, encoder)
- return encoder
- }
- type onePtrEncoder struct {
- encoder ValEncoder
- }
- func (encoder *onePtrEncoder) IsEmpty(ptr unsafe.Pointer) bool {
- return encoder.encoder.IsEmpty(unsafe.Pointer(&ptr))
- }
- func (encoder *onePtrEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
- encoder.encoder.Encode(unsafe.Pointer(&ptr), stream)
- }
- func encoderOfType(ctx *ctx, typ reflect2.Type) ValEncoder {
- encoder := getTypeEncoderFromExtension(ctx, typ)
- if encoder != nil {
- return encoder
- }
- encoder = createEncoderOfType(ctx, typ)
- for _, extension := range extensions {
- encoder = extension.DecorateEncoder(typ, encoder)
- }
- encoder = ctx.encoderExtension.DecorateEncoder(typ, encoder)
- for _, extension := range ctx.extraExtensions {
- encoder = extension.DecorateEncoder(typ, encoder)
- }
- return encoder
- }
- func createEncoderOfType(ctx *ctx, typ reflect2.Type) ValEncoder {
- encoder := ctx.encoders[typ]
- if encoder != nil {
- return encoder
- }
- placeholder := &placeholderEncoder{}
- ctx.encoders[typ] = placeholder
- encoder = _createEncoderOfType(ctx, typ)
- placeholder.encoder = encoder
- return encoder
- }
- func _createEncoderOfType(ctx *ctx, typ reflect2.Type) ValEncoder {
- encoder := createEncoderOfJsonRawMessage(ctx, typ)
- if encoder != nil {
- return encoder
- }
- encoder = createEncoderOfJsonNumber(ctx, typ)
- if encoder != nil {
- return encoder
- }
- encoder = createEncoderOfMarshaler(ctx, typ)
- if encoder != nil {
- return encoder
- }
- encoder = createEncoderOfAny(ctx, typ)
- if encoder != nil {
- return encoder
- }
- encoder = createEncoderOfNative(ctx, typ)
- if encoder != nil {
- return encoder
- }
- kind := typ.Kind()
- switch kind {
- case reflect.Interface:
- return &dynamicEncoder{typ}
- case reflect.Struct:
- return encoderOfStruct(ctx, typ)
- case reflect.Array:
- return encoderOfArray(ctx, typ)
- case reflect.Slice:
- return encoderOfSlice(ctx, typ)
- case reflect.Map:
- return encoderOfMap(ctx, typ)
- case reflect.Ptr:
- return encoderOfOptional(ctx, typ)
- default:
- return &lazyErrorEncoder{err: fmt.Errorf("%s%s is unsupported type", ctx.prefix, typ.String())}
- }
- }
- type lazyErrorDecoder struct {
- err error
- }
- func (decoder *lazyErrorDecoder) Decode(ptr unsafe.Pointer, iter *Iterator) {
- if iter.WhatIsNext() != NilValue {
- if iter.Error == nil {
- iter.Error = decoder.err
- }
- } else {
- iter.Skip()
- }
- }
- type lazyErrorEncoder struct {
- err error
- }
- func (encoder *lazyErrorEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
- if ptr == nil {
- stream.WriteNil()
- } else if stream.Error == nil {
- stream.Error = encoder.err
- }
- }
- func (encoder *lazyErrorEncoder) IsEmpty(ptr unsafe.Pointer) bool {
- return false
- }
- type placeholderDecoder struct {
- decoder ValDecoder
- }
- func (decoder *placeholderDecoder) Decode(ptr unsafe.Pointer, iter *Iterator) {
- decoder.decoder.Decode(ptr, iter)
- }
- type placeholderEncoder struct {
- encoder ValEncoder
- }
- func (encoder *placeholderEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
- encoder.encoder.Encode(ptr, stream)
- }
- func (encoder *placeholderEncoder) IsEmpty(ptr unsafe.Pointer) bool {
- return encoder.encoder.IsEmpty(ptr)
- }
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