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|
package msgpack
import (
"encoding"
"errors"
"fmt"
"reflect"
)
var (
interfaceType = reflect.TypeOf((*interface{})(nil)).Elem()
stringType = reflect.TypeOf((*string)(nil)).Elem()
)
var valueDecoders []decoderFunc
//nolint:gochecknoinits
func init() {
valueDecoders = []decoderFunc{
reflect.Bool: decodeBoolValue,
reflect.Int: decodeInt64Value,
reflect.Int8: decodeInt64Value,
reflect.Int16: decodeInt64Value,
reflect.Int32: decodeInt64Value,
reflect.Int64: decodeInt64Value,
reflect.Uint: decodeUint64Value,
reflect.Uint8: decodeUint64Value,
reflect.Uint16: decodeUint64Value,
reflect.Uint32: decodeUint64Value,
reflect.Uint64: decodeUint64Value,
reflect.Float32: decodeFloat32Value,
reflect.Float64: decodeFloat64Value,
reflect.Complex64: decodeUnsupportedValue,
reflect.Complex128: decodeUnsupportedValue,
reflect.Array: decodeArrayValue,
reflect.Chan: decodeUnsupportedValue,
reflect.Func: decodeUnsupportedValue,
reflect.Interface: decodeInterfaceValue,
reflect.Map: decodeMapValue,
reflect.Ptr: decodeUnsupportedValue,
reflect.Slice: decodeSliceValue,
reflect.String: decodeStringValue,
reflect.Struct: decodeStructValue,
reflect.UnsafePointer: decodeUnsupportedValue,
}
}
func getDecoder(typ reflect.Type) decoderFunc {
if v, ok := typeDecMap.Load(typ); ok {
return v.(decoderFunc)
}
fn := _getDecoder(typ)
typeDecMap.Store(typ, fn)
return fn
}
func _getDecoder(typ reflect.Type) decoderFunc {
kind := typ.Kind()
if kind == reflect.Ptr {
if _, ok := typeDecMap.Load(typ.Elem()); ok {
return ptrValueDecoder(typ)
}
}
if typ.Implements(customDecoderType) {
return nilAwareDecoder(typ, decodeCustomValue)
}
if typ.Implements(unmarshalerType) {
return nilAwareDecoder(typ, unmarshalValue)
}
if typ.Implements(binaryUnmarshalerType) {
return nilAwareDecoder(typ, unmarshalBinaryValue)
}
if typ.Implements(textUnmarshalerType) {
return nilAwareDecoder(typ, unmarshalTextValue)
}
// Addressable struct field value.
if kind != reflect.Ptr {
ptr := reflect.PtrTo(typ)
if ptr.Implements(customDecoderType) {
return addrDecoder(nilAwareDecoder(typ, decodeCustomValue))
}
if ptr.Implements(unmarshalerType) {
return addrDecoder(nilAwareDecoder(typ, unmarshalValue))
}
if ptr.Implements(binaryUnmarshalerType) {
return addrDecoder(nilAwareDecoder(typ, unmarshalBinaryValue))
}
if ptr.Implements(textUnmarshalerType) {
return addrDecoder(nilAwareDecoder(typ, unmarshalTextValue))
}
}
switch kind {
case reflect.Ptr:
return ptrValueDecoder(typ)
case reflect.Slice:
elem := typ.Elem()
if elem.Kind() == reflect.Uint8 {
return decodeBytesValue
}
if elem == stringType {
return decodeStringSliceValue
}
case reflect.Array:
if typ.Elem().Kind() == reflect.Uint8 {
return decodeByteArrayValue
}
case reflect.Map:
if typ.Key() == stringType {
switch typ.Elem() {
case stringType:
return decodeMapStringStringValue
case interfaceType:
return decodeMapStringInterfaceValue
}
}
}
return valueDecoders[kind]
}
func ptrValueDecoder(typ reflect.Type) decoderFunc {
decoder := getDecoder(typ.Elem())
return func(d *Decoder, v reflect.Value) error {
if d.hasNilCode() {
if !v.IsNil() {
v.Set(reflect.Zero(v.Type()))
}
return d.DecodeNil()
}
if v.IsNil() {
v.Set(reflect.New(v.Type().Elem()))
}
return decoder(d, v.Elem())
}
}
func addrDecoder(fn decoderFunc) decoderFunc {
return func(d *Decoder, v reflect.Value) error {
if !v.CanAddr() {
return fmt.Errorf("msgpack: Decode(nonaddressable %T)", v.Interface())
}
return fn(d, v.Addr())
}
}
func nilAwareDecoder(typ reflect.Type, fn decoderFunc) decoderFunc {
if nilable(typ.Kind()) {
return func(d *Decoder, v reflect.Value) error {
if d.hasNilCode() {
return d.decodeNilValue(v)
}
if v.IsNil() {
v.Set(reflect.New(v.Type().Elem()))
}
return fn(d, v)
}
}
return func(d *Decoder, v reflect.Value) error {
if d.hasNilCode() {
return d.decodeNilValue(v)
}
return fn(d, v)
}
}
func decodeBoolValue(d *Decoder, v reflect.Value) error {
flag, err := d.DecodeBool()
if err != nil {
return err
}
v.SetBool(flag)
return nil
}
func decodeInterfaceValue(d *Decoder, v reflect.Value) error {
if v.IsNil() {
return d.interfaceValue(v)
}
return d.DecodeValue(v.Elem())
}
func (d *Decoder) interfaceValue(v reflect.Value) error {
vv, err := d.decodeInterfaceCond()
if err != nil {
return err
}
if vv != nil {
if v.Type() == errorType {
if vv, ok := vv.(string); ok {
v.Set(reflect.ValueOf(errors.New(vv)))
return nil
}
}
v.Set(reflect.ValueOf(vv))
}
return nil
}
func decodeUnsupportedValue(d *Decoder, v reflect.Value) error {
return fmt.Errorf("msgpack: Decode(unsupported %s)", v.Type())
}
//------------------------------------------------------------------------------
func decodeCustomValue(d *Decoder, v reflect.Value) error {
decoder := v.Interface().(CustomDecoder)
return decoder.DecodeMsgpack(d)
}
func unmarshalValue(d *Decoder, v reflect.Value) error {
var b []byte
d.rec = make([]byte, 0, 64)
if err := d.Skip(); err != nil {
return err
}
b = d.rec
d.rec = nil
unmarshaler := v.Interface().(Unmarshaler)
return unmarshaler.UnmarshalMsgpack(b)
}
func unmarshalBinaryValue(d *Decoder, v reflect.Value) error {
data, err := d.DecodeBytes()
if err != nil {
return err
}
unmarshaler := v.Interface().(encoding.BinaryUnmarshaler)
return unmarshaler.UnmarshalBinary(data)
}
func unmarshalTextValue(d *Decoder, v reflect.Value) error {
data, err := d.DecodeBytes()
if err != nil {
return err
}
unmarshaler := v.Interface().(encoding.TextUnmarshaler)
return unmarshaler.UnmarshalText(data)
}
|
