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package stt
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import (
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"fmt"
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"github.com/modern-go/reflect2"
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"reflect"
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"unsafe"
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)
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// ValDecoder is an internal type registered to cache as needed.
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// 反射获取类型并缓存
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// 尽可能地避免反射获取值，reflect.Value本身具有alloc，但具有如下例外
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// 1. 创建新值的实例，如： *int 将需要 int
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// 2. slice的append，如果容量(cap)不够，将使用Reflect.New从而alloc
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// 3. 将值分配给map，key/value都是reflect.Value
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// 对于简单struct的绑定，应该尽量避免reflect.Value和其本身的alloc开销
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type ValDecoder interface {
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Decode(ptr unsafe.Pointer, iter *Iterator)
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}
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// ValEncoder is an internal type registered to cache as needed.
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type ValEncoder interface {
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IsEmpty(ptr unsafe.Pointer) bool
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Encode(ptr unsafe.Pointer, stream *Stream)
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}
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type checkIsEmpty interface {
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IsEmpty(ptr unsafe.Pointer) bool
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}
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type ctx struct {
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*frozenConfig
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prefix string
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encoders map[reflect2.Type]ValEncoder
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decoders map[reflect2.Type]ValDecoder
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}
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func (b *ctx) caseSensitive() bool {
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if b.frozenConfig == nil {
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// default is case-insensitive
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return false
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}
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return b.frozenConfig.caseSensitive
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}
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func (b *ctx) append(prefix string) *ctx {
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return &ctx{
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frozenConfig: b.frozenConfig,
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prefix: b.prefix + " " + prefix,
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encoders: b.encoders,
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decoders: b.decoders,
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}
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}
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// ReadVal copy the underlying STT into go interface
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func (iter *Iterator) ReadVal(obj interface{}) {
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depth := iter.depth
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cacheKey := reflect2.RTypeOf(obj)
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decoder := iter.cfg.getDecoderFromCache(cacheKey)
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if decoder == nil {
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typ := reflect2.TypeOf(obj)
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if typ == nil || typ.Kind() != reflect.Ptr {
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iter.ReportError("ReadVal", "can only unmarshal into pointer")
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return
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}
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decoder = iter.cfg.DecoderOf(typ)
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}
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ptr := reflect2.PtrOf(obj)
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if ptr == nil {
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iter.ReportError("ReadVal", "can not read into nil pointer")
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return
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}
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decoder.Decode(ptr, iter)
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if iter.depth != depth {
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iter.ReportError("ReadVal", "unexpected mismatched nesting")
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return
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}
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}
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// WriteVal copy the go interface into underlying JSON, same as json.Marshal
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func (stream *Stream) WriteVal(val interface{}) {
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if nil == val {
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stream.WriteNil()
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return
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}
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cacheKey := reflect2.RTypeOf(val)
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encoder := stream.cfg.getEncoderFromCache(cacheKey)
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if encoder == nil {
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typ := reflect2.TypeOf(val)
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encoder = stream.cfg.EncoderOf(typ)
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}
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encoder.Encode(reflect2.PtrOf(val), stream)
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}
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func (cfg *frozenConfig) DecoderOf(typ reflect2.Type) ValDecoder {
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cacheKey := typ.RType()
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decoder := cfg.getDecoderFromCache(cacheKey)
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if decoder != nil {
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return decoder
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}
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ctx := &ctx{
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frozenConfig: cfg,
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prefix: "",
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decoders: map[reflect2.Type]ValDecoder{},
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encoders: map[reflect2.Type]ValEncoder{},
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}
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ptrType := typ.(*reflect2.UnsafePtrType)
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decoder = decoderOfType(ctx, ptrType.Elem())
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cfg.addDecoderToCache(cacheKey, decoder)
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return decoder
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}
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func decoderOfType(ctx *ctx, typ reflect2.Type) ValDecoder {
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decoder := getTypeDecoderFromExtension(ctx, typ)
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if decoder != nil {
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return decoder
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}
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decoder = createDecoderOfType(ctx, typ)
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for _, extension := range extensions {
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decoder = extension.DecorateDecoder(typ, decoder)
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}
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decoder = ctx.decoderExtension.DecorateDecoder(typ, decoder)
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for _, extension := range ctx.extraExtensions {
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decoder = extension.DecorateDecoder(typ, decoder)
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}
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return decoder
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}
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func createDecoderOfType(ctx *ctx, typ reflect2.Type) ValDecoder {
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decoder := ctx.decoders[typ]
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if decoder != nil {
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return decoder
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}
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placeholder := &placeholderDecoder{}
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ctx.decoders[typ] = placeholder
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decoder = _createDecoderOfType(ctx, typ)
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placeholder.decoder = decoder
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return decoder
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}
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func _createDecoderOfType(ctx *ctx, typ reflect2.Type) ValDecoder {
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decoder := createDecoderOfNative(ctx, typ)
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if decoder != nil {
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return decoder
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}
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switch typ.Kind() {
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case reflect.Interface:
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ifaceType, isIFace := typ.(*reflect2.UnsafeIFaceType)
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if isIFace {
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return &ifaceDecoder{valType: ifaceType}
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}
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return &efaceDecoder{}
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case reflect.Struct:
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return decoderOfStruct(ctx, typ)
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case reflect.Array:
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return decoderOfArray(ctx, typ)
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case reflect.Slice:
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return decoderOfSlice(ctx, typ)
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case reflect.Map:
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return decoderOfMap(ctx, typ)
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case reflect.Ptr:
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return decoderOfOptional(ctx, typ)
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default:
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return &lazyErrorDecoder{err: fmt.Errorf("%s%s is unsupported type", ctx.prefix, typ.String())}
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}
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}
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func (cfg *frozenConfig) EncoderOf(typ reflect2.Type) ValEncoder {
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cacheKey := typ.RType()
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encoder := cfg.getEncoderFromCache(cacheKey)
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if encoder != nil {
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return encoder
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}
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ctx := &ctx{
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frozenConfig: cfg,
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prefix: "",
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decoders: map[reflect2.Type]ValDecoder{},
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encoders: map[reflect2.Type]ValEncoder{},
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}
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encoder = encoderOfType(ctx, typ)
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if typ.LikePtr() {
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encoder = &onePtrEncoder{encoder}
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}
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cfg.addEncoderToCache(cacheKey, encoder)
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return encoder
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}
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type onePtrEncoder struct {
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encoder ValEncoder
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}
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func (encoder *onePtrEncoder) IsEmpty(ptr unsafe.Pointer) bool {
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return encoder.encoder.IsEmpty(unsafe.Pointer(&ptr))
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}
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func (encoder *onePtrEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
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encoder.encoder.Encode(unsafe.Pointer(&ptr), stream)
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}
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func encoderOfType(ctx *ctx, typ reflect2.Type) ValEncoder {
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encoder := getTypeEncoderFromExtension(ctx, typ)
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if encoder != nil {
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return encoder
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}
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encoder = createEncoderOfType(ctx, typ)
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for _, extension := range extensions {
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encoder = extension.DecorateEncoder(typ, encoder)
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}
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encoder = ctx.encoderExtension.DecorateEncoder(typ, encoder)
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for _, extension := range ctx.extraExtensions {
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encoder = extension.DecorateEncoder(typ, encoder)
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}
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return encoder
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}
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func createEncoderOfType(ctx *ctx, typ reflect2.Type) ValEncoder {
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encoder := ctx.encoders[typ]
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if encoder != nil {
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return encoder
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}
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placeholder := &placeholderEncoder{}
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ctx.encoders[typ] = placeholder
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encoder = _createEncoderOfType(ctx, typ)
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placeholder.encoder = encoder
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return encoder
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}
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func _createEncoderOfType(ctx *ctx, typ reflect2.Type) ValEncoder {
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encoder := createEncoderOfNative(ctx, typ)
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if encoder != nil {
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return encoder
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}
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kind := typ.Kind()
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switch kind {
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case reflect.Interface:
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return &dynamicEncoder{typ}
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case reflect.Struct:
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return encoderOfStruct(ctx, typ)
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case reflect.Array:
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return encoderOfArray(ctx, typ)
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case reflect.Slice:
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return encoderOfSlice(ctx, typ)
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case reflect.Map:
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return encoderOfMap(ctx, typ)
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case reflect.Ptr:
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return encoderOfOptional(ctx, typ)
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default:
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return &lazyErrorEncoder{err: fmt.Errorf("%s%s is unsupported type", ctx.prefix, typ.String())}
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}
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}
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type lazyErrorDecoder struct {
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err error
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}
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func (decoder *lazyErrorDecoder) Decode(ptr unsafe.Pointer, iter *Iterator) {
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if iter.WhatIsNext() != NilValue {
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if iter.Error == nil {
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iter.Error = decoder.err
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}
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} else {
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iter.Skip()
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}
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}
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type lazyErrorEncoder struct {
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err error
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}
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func (encoder *lazyErrorEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
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if ptr == nil {
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stream.WriteNil()
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} else if stream.Error == nil {
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stream.Error = encoder.err
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}
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}
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func (encoder *lazyErrorEncoder) IsEmpty(ptr unsafe.Pointer) bool {
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return false
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}
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type placeholderDecoder struct {
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decoder ValDecoder
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}
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func (decoder *placeholderDecoder) Decode(ptr unsafe.Pointer, iter *Iterator) {
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decoder.decoder.Decode(ptr, iter)
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}
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type placeholderEncoder struct {
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encoder ValEncoder
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}
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func (encoder *placeholderEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
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encoder.encoder.Encode(ptr, stream)
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}
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func (encoder *placeholderEncoder) IsEmpty(ptr unsafe.Pointer) bool {
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return encoder.encoder.IsEmpty(ptr)
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}
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