8 "github.com/modern-go/reflect2"
11 // ValDecoder is an internal type registered to cache as needed.
12 // Don't confuse jsoniter.ValDecoder with json.Decoder.
13 // For json.Decoder's adapter, refer to jsoniter.AdapterDecoder(todo link).
15 // Reflection on type to create decoders, which is then cached
16 // Reflection on value is avoided as we can, as the reflect.Value itself will allocate, with following exceptions
17 // 1. create instance of new value, for example *int will need a int to be allocated
18 // 2. append to slice, if the existing cap is not enough, allocate will be done using Reflect.New
19 // 3. assignment to map, both key and value will be reflect.Value
20 // For a simple struct binding, it will be reflect.Value free and allocation free
21 type ValDecoder interface {
22 Decode(ptr unsafe.Pointer, iter *Iterator)
25 // ValEncoder is an internal type registered to cache as needed.
26 // Don't confuse jsoniter.ValEncoder with json.Encoder.
27 // For json.Encoder's adapter, refer to jsoniter.AdapterEncoder(todo godoc link).
28 type ValEncoder interface {
29 IsEmpty(ptr unsafe.Pointer) bool
30 Encode(ptr unsafe.Pointer, stream *Stream)
33 type checkIsEmpty interface {
34 IsEmpty(ptr unsafe.Pointer) bool
40 encoders map[reflect2.Type]ValEncoder
41 decoders map[reflect2.Type]ValDecoder
44 func (b *ctx) caseSensitive() bool {
45 if b.frozenConfig == nil {
46 // default is case-insensitive
49 return b.frozenConfig.caseSensitive
52 func (b *ctx) append(prefix string) *ctx {
54 frozenConfig: b.frozenConfig,
55 prefix: b.prefix + " " + prefix,
61 // ReadVal copy the underlying JSON into go interface, same as json.Unmarshal
62 func (iter *Iterator) ReadVal(obj interface{}) {
63 cacheKey := reflect2.RTypeOf(obj)
64 decoder := iter.cfg.getDecoderFromCache(cacheKey)
66 typ := reflect2.TypeOf(obj)
67 if typ.Kind() != reflect.Ptr {
68 iter.ReportError("ReadVal", "can only unmarshal into pointer")
71 decoder = iter.cfg.DecoderOf(typ)
73 ptr := reflect2.PtrOf(obj)
75 iter.ReportError("ReadVal", "can not read into nil pointer")
78 decoder.Decode(ptr, iter)
81 // WriteVal copy the go interface into underlying JSON, same as json.Marshal
82 func (stream *Stream) WriteVal(val interface{}) {
87 cacheKey := reflect2.RTypeOf(val)
88 encoder := stream.cfg.getEncoderFromCache(cacheKey)
90 typ := reflect2.TypeOf(val)
91 encoder = stream.cfg.EncoderOf(typ)
93 encoder.Encode(reflect2.PtrOf(val), stream)
96 func (cfg *frozenConfig) DecoderOf(typ reflect2.Type) ValDecoder {
97 cacheKey := typ.RType()
98 decoder := cfg.getDecoderFromCache(cacheKey)
105 decoders: map[reflect2.Type]ValDecoder{},
106 encoders: map[reflect2.Type]ValEncoder{},
108 ptrType := typ.(*reflect2.UnsafePtrType)
109 decoder = decoderOfType(ctx, ptrType.Elem())
110 cfg.addDecoderToCache(cacheKey, decoder)
114 func decoderOfType(ctx *ctx, typ reflect2.Type) ValDecoder {
115 decoder := getTypeDecoderFromExtension(ctx, typ)
119 decoder = createDecoderOfType(ctx, typ)
120 for _, extension := range extensions {
121 decoder = extension.DecorateDecoder(typ, decoder)
123 decoder = ctx.decoderExtension.DecorateDecoder(typ, decoder)
124 for _, extension := range ctx.extraExtensions {
125 decoder = extension.DecorateDecoder(typ, decoder)
130 func createDecoderOfType(ctx *ctx, typ reflect2.Type) ValDecoder {
131 decoder := ctx.decoders[typ]
135 placeholder := &placeholderDecoder{}
136 ctx.decoders[typ] = placeholder
137 decoder = _createDecoderOfType(ctx, typ)
138 placeholder.decoder = decoder
142 func _createDecoderOfType(ctx *ctx, typ reflect2.Type) ValDecoder {
143 decoder := createDecoderOfJsonRawMessage(ctx, typ)
147 decoder = createDecoderOfJsonNumber(ctx, typ)
151 decoder = createDecoderOfMarshaler(ctx, typ)
155 decoder = createDecoderOfAny(ctx, typ)
159 decoder = createDecoderOfNative(ctx, typ)
164 case reflect.Interface:
165 ifaceType, isIFace := typ.(*reflect2.UnsafeIFaceType)
167 return &ifaceDecoder{valType: ifaceType}
169 return &efaceDecoder{}
171 return decoderOfStruct(ctx, typ)
173 return decoderOfArray(ctx, typ)
175 return decoderOfSlice(ctx, typ)
177 return decoderOfMap(ctx, typ)
179 return decoderOfOptional(ctx, typ)
181 return &lazyErrorDecoder{err: fmt.Errorf("%s%s is unsupported type", ctx.prefix, typ.String())}
185 func (cfg *frozenConfig) EncoderOf(typ reflect2.Type) ValEncoder {
186 cacheKey := typ.RType()
187 encoder := cfg.getEncoderFromCache(cacheKey)
194 decoders: map[reflect2.Type]ValDecoder{},
195 encoders: map[reflect2.Type]ValEncoder{},
197 encoder = encoderOfType(ctx, typ)
199 encoder = &onePtrEncoder{encoder}
201 cfg.addEncoderToCache(cacheKey, encoder)
205 type onePtrEncoder struct {
209 func (encoder *onePtrEncoder) IsEmpty(ptr unsafe.Pointer) bool {
210 return encoder.encoder.IsEmpty(unsafe.Pointer(&ptr))
213 func (encoder *onePtrEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
214 encoder.encoder.Encode(unsafe.Pointer(&ptr), stream)
217 func encoderOfType(ctx *ctx, typ reflect2.Type) ValEncoder {
218 encoder := getTypeEncoderFromExtension(ctx, typ)
222 encoder = createEncoderOfType(ctx, typ)
223 for _, extension := range extensions {
224 encoder = extension.DecorateEncoder(typ, encoder)
226 encoder = ctx.encoderExtension.DecorateEncoder(typ, encoder)
227 for _, extension := range ctx.extraExtensions {
228 encoder = extension.DecorateEncoder(typ, encoder)
233 func createEncoderOfType(ctx *ctx, typ reflect2.Type) ValEncoder {
234 encoder := ctx.encoders[typ]
238 placeholder := &placeholderEncoder{}
239 ctx.encoders[typ] = placeholder
240 encoder = _createEncoderOfType(ctx, typ)
241 placeholder.encoder = encoder
244 func _createEncoderOfType(ctx *ctx, typ reflect2.Type) ValEncoder {
245 encoder := createEncoderOfJsonRawMessage(ctx, typ)
249 encoder = createEncoderOfJsonNumber(ctx, typ)
253 encoder = createEncoderOfMarshaler(ctx, typ)
257 encoder = createEncoderOfAny(ctx, typ)
261 encoder = createEncoderOfNative(ctx, typ)
267 case reflect.Interface:
268 return &dynamicEncoder{typ}
270 return encoderOfStruct(ctx, typ)
272 return encoderOfArray(ctx, typ)
274 return encoderOfSlice(ctx, typ)
276 return encoderOfMap(ctx, typ)
278 return encoderOfOptional(ctx, typ)
280 return &lazyErrorEncoder{err: fmt.Errorf("%s%s is unsupported type", ctx.prefix, typ.String())}
284 type lazyErrorDecoder struct {
288 func (decoder *lazyErrorDecoder) Decode(ptr unsafe.Pointer, iter *Iterator) {
289 if iter.WhatIsNext() != NilValue {
290 if iter.Error == nil {
291 iter.Error = decoder.err
298 type lazyErrorEncoder struct {
302 func (encoder *lazyErrorEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
305 } else if stream.Error == nil {
306 stream.Error = encoder.err
310 func (encoder *lazyErrorEncoder) IsEmpty(ptr unsafe.Pointer) bool {
314 type placeholderDecoder struct {
318 func (decoder *placeholderDecoder) Decode(ptr unsafe.Pointer, iter *Iterator) {
319 decoder.decoder.Decode(ptr, iter)
322 type placeholderEncoder struct {
326 func (encoder *placeholderEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
327 encoder.encoder.Encode(ptr, stream)
330 func (encoder *placeholderEncoder) IsEmpty(ptr unsafe.Pointer) bool {
331 return encoder.encoder.IsEmpty(ptr)