// object consumes an object from d.data[d.off-1:], decoding into the value v.
// the first byte of the object ('{') has been read already.
func (d *decodeState) object(v reflect.Value) {
// Check for unmarshaler.
unmarshaler, pv := d.indirect(v, false)
if unmarshaler != nil {
d.off--
err := unmarshaler.UnmarshalJSON(d.next())
if err != nil {
d.error(err)
}
return
}
v = pv
// Decoding into nil interface? Switch to non-reflect code.
iv, ok := v.(*reflect.InterfaceValue)
if ok {
iv.Set(reflect.NewValue(d.objectInterface()))
return
}
// Check type of target: struct or map[string]T
var (
mv *reflect.MapValue
sv *reflect.StructValue
)
switch v := v.(type) {
case *reflect.MapValue:
// map must have string type
t := v.Type().(*reflect.MapType)
if t.Key() != reflect.Typeof("") {
d.saveError(&UnmarshalTypeError{"object", v.Type()})
break
}
mv = v
if mv.IsNil() {
mv.SetValue(reflect.MakeMap(t))
}
case *reflect.StructValue:
sv = v
default:
d.saveError(&UnmarshalTypeError{"object", v.Type()})
}
if mv == nil && sv == nil {
d.off--
d.next() // skip over { } in input
return
}
for {
// Read opening " of string key or closing }.
op := d.scanWhile(scanSkipSpace)
if op == scanEndObject {
// closing } - can only happen on first iteration.
break
}
if op != scanBeginLiteral {
d.error(errPhase)
}
// Read string key.
start := d.off - 1
op = d.scanWhile(scanContinue)
item := d.data[start : d.off-1]
key, ok := unquote(item)
if !ok {
d.error(errPhase)
}
// Figure out field corresponding to key.
var subv reflect.Value
if mv != nil {
subv = reflect.MakeZero(mv.Type().(*reflect.MapType).Elem())
} else {
// First try for field with that tag.
for i := 0; i < sv.NumField(); i++ {
f := sv.Type().(*reflect.StructType).Field(i)
if f.Tag == key {
subv = sv.Field(i)
break
}
}
if subv == nil {
// Second, exact match.
subv = sv.FieldByName(key)
if subv == nil {
// Third, case-insensitive match.
subv = sv.FieldByNameFunc(func(s string) bool { return matchName(key, s) })
}
}
}
// Read : before value.
if op == scanSkipSpace {
op = d.scanWhile(scanSkipSpace)
}
if op != scanObjectKey {
d.error(errPhase)
}
// Read value.
d.value(subv)
// Write value back to map;
// if using struct, subv points into struct already.
if mv != nil {
mv.SetElem(reflect.NewValue(key), subv)
}
// Next token must be , or }.
op = d.scanWhile(scanSkipSpace)
if op == scanEndObject {
break
}
if op != scanObjectValue {
d.error(errPhase)
}
}
}