func (p *printer) marshalSimple(typ reflect.Type, val reflect.Value) (string, []byte, error) {
switch val.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return strconv.FormatInt(val.Int(), 10), nil, nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return strconv.FormatUint(val.Uint(), 10), nil, nil
case reflect.Float32, reflect.Float64:
return strconv.FormatFloat(val.Float(), 'g', -1, val.Type().Bits()), nil, nil
case reflect.String:
return val.String(), nil, nil
case reflect.Bool:
return strconv.FormatBool(val.Bool()), nil, nil
case reflect.Array:
if typ.Elem().Kind() != reflect.Uint8 {
break
}
// [...]byte
var bytes []byte
if val.CanAddr() {
bytes = val.Slice(0, val.Len()).Bytes()
} else {
bytes = make([]byte, val.Len())
reflect.Copy(reflect.ValueOf(bytes), val)
}
return "", bytes, nil
case reflect.Slice:
if typ.Elem().Kind() != reflect.Uint8 {
break
}
// []byte
return "", val.Bytes(), nil
}
return "", nil, &UnsupportedTypeError{typ}
}
func GetColVals(val reflect.Value, cols []string) (values []string, err error) {
typ := val.Type()
// if not struct, then must just have one column.
if val.Kind() != reflect.Struct && len(cols) != 1 {
return nil, fmt.Errorf("GetColVals> If not a struct(%s), must have one column: %v", val.Kind(), cols)
}
values = make([]string, len(cols))
for i, col := range cols {
var fieldVal reflect.Value
if val.Kind() == reflect.Struct {
fieldIndex := getFieldIndexByName(typ, col)
if fieldIndex[0] < 0 {
return nil, fmt.Errorf("GetColVals> Can't found struct field(column): '%s'\n", col)
}
fieldVal = val.FieldByIndex(fieldIndex)
} else {
fieldVal = val
}
if values[i], err = GetValQuoteStr(fieldVal); err != nil {
return
}
}
return
}
func ReturnWhenSet(a, k interface{}) interface{} {
av, isNil := indirect(reflect.ValueOf(a))
if isNil {
return ""
}
var avv reflect.Value
switch av.Kind() {
case reflect.Array, reflect.Slice:
index, ok := k.(int)
if ok && av.Len() > index {
avv = av.Index(index)
}
case reflect.Map:
kv := reflect.ValueOf(k)
if kv.Type().AssignableTo(av.Type().Key()) {
avv = av.MapIndex(kv)
}
}
if avv.IsValid() {
switch avv.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return avv.Int()
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return avv.Uint()
case reflect.Float32, reflect.Float64:
return avv.Float()
case reflect.String:
return avv.String()
}
}
return ""
}
func setValue(dstVal reflect.Value, src interface{}) {
if dstVal.Kind() == reflect.Ptr {
dstVal = reflect.Indirect(dstVal)
}
srcVal := reflect.ValueOf(src)
if !srcVal.IsValid() { // src is literal nil
if dstVal.CanAddr() {
// Convert to pointer so that pointer's value can be nil'ed
// dstVal = dstVal.Addr()
}
dstVal.Set(reflect.Zero(dstVal.Type()))
} else if srcVal.Kind() == reflect.Ptr {
if srcVal.IsNil() {
srcVal = reflect.Zero(dstVal.Type())
} else {
srcVal = reflect.ValueOf(src).Elem()
}
dstVal.Set(srcVal)
} else {
dstVal.Set(srcVal)
}
}
// Validates that if a value is provided for a field, that value must be at
// least a minimum length.
func validateFieldMin(f reflect.StructField, fvalue reflect.Value) error {
minStr := f.Tag.Get("min")
if minStr == "" {
return nil
}
min, _ := strconv.ParseInt(minStr, 10, 64)
kind := fvalue.Kind()
if kind == reflect.Ptr {
if fvalue.IsNil() {
return nil
}
fvalue = fvalue.Elem()
}
switch fvalue.Kind() {
case reflect.String:
if int64(fvalue.Len()) < min {
return fmt.Errorf("field too short, minimum length %d", min)
}
case reflect.Slice, reflect.Map:
if fvalue.IsNil() {
return nil
}
if int64(fvalue.Len()) < min {
return fmt.Errorf("field too short, minimum length %d", min)
}
// TODO min can also apply to number minimum value.
}
return nil
}
// rv must be a non-nil pointer or a settable value
func indirect(rv reflect.Value) (reflect.Value, error) {
for {
if rv.Kind() == reflect.Interface && !rv.IsNil() {
if e := rv.Elem(); e.Kind() == reflect.Ptr && !e.IsNil() {
rv = e.Elem()
}
}
if rv.Kind() == reflect.Map && rv.IsNil() {
rv.Set(reflect.MakeMap(rv.Type()))
}
if rv.Kind() != reflect.Ptr {
break
}
if rv.IsNil() {
rv.Set(reflect.New(rv.Type().Elem()))
}
rv = rv.Elem()
}
if k := rv.Kind(); k != reflect.Struct && k != reflect.Map {
return reflect.Value{}, &InvalidIndirectError{rv.Type()}
}
if rv.Kind() == reflect.Map {
if t := rv.Type(); t.Key().Kind() != reflect.String || t.Elem().Kind() != reflect.String {
return reflect.Value{}, &InvalidIndirectError{t}
}
}
return rv, nil
}
func (mssql) SqlTag(value reflect.Value, size int, autoIncrease bool) string {
switch value.Kind() {
case reflect.Bool:
return "bit"
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uintptr:
if autoIncrease {
return "int IDENTITY(1,1)"
}
return "int"
case reflect.Int64, reflect.Uint64:
if autoIncrease {
return "bigint IDENTITY(1,1)"
}
return "bigint"
case reflect.Float32, reflect.Float64:
return "float"
case reflect.String:
if size > 0 && size < 65532 {
return fmt.Sprintf("nvarchar(%d)", size)
}
return "text"
case reflect.Struct:
if _, ok := value.Interface().(time.Time); ok {
return "datetime2"
}
default:
if _, ok := value.Interface().([]byte); ok {
if size > 0 && size < 65532 {
return fmt.Sprintf("varchar(%d)", size)
}
return "text"
}
}
panic(fmt.Sprintf("invalid sql type %s (%s) for mssql", value.Type().Name(), value.Kind().String()))
}
func encodeField(w io.Writer, f reflect.Value) error {
if f.Type() == timeType {
return encodeTime(w, f)
}
switch f.Kind() {
case reflect.Uint8:
fallthrough
case reflect.Uint16:
fallthrough
case reflect.Uint32:
fallthrough
case reflect.Uint64:
fallthrough
case reflect.Int64:
fallthrough
case reflect.Int32:
fallthrough
case reflect.Int16:
fallthrough
case reflect.Int8:
return binary.Write(w, byteOrder, f.Interface())
case reflect.String:
return encodeStrField(w, f)
case reflect.Slice:
return encodeArray(w, f)
case reflect.Interface:
return encodeField(w, f.Elem())
default:
panic(fmt.Sprintf("unimplemented kind %v", f))
}
}
func unflattenValue(v reflect.Value, t reflect.Type) reflect.Value {
// When t is an Interface, we can't do much, since we don't know the
// original (unflattened) type of the value placed in v, so we just nop it.
if t.Kind() == reflect.Interface {
return v
}
// v can be invalid, if it holds the nil value for pointer type
if !v.IsValid() {
return v
}
// Make sure v is indeed flat
if v.Kind() == reflect.Ptr {
panic("unflattening non-flat value")
}
// Add a *, one at a time
for t.Kind() == reflect.Ptr {
if v.CanAddr() {
v = v.Addr()
} else {
pw := reflect.New(v.Type())
pw.Elem().Set(v)
v = pw
}
t = t.Elem()
}
return v
}
func (m *mapper) unpackValue(keys []string, values []interface{}, out reflect.Value) error {
switch out.Kind() {
case reflect.Ptr:
if out.IsNil() {
out.Set(reflect.New(out.Type().Elem()))
}
return m.unpackValue(keys, values, reflect.Indirect(out))
case reflect.Slice:
if keys == nil {
return m.unpackSimple(nil, values, out)
} else {
return m.unpackSlice(keys, values, out)
}
case reflect.Struct:
return m.unpackStruct(keys, values, out)
case reflect.Map:
if keys == nil {
return m.unpackSimple(nil, values, out)
} else {
return m.unpackMap(keys, values, out)
}
default:
return m.unpackSimple(nil, values, out)
}
return fmt.Errorf("cannot unpack result to %T (%s)", out, out.Kind())
}
// NotNilFilter returns true for field values that are not nil;
// it returns false otherwise.
func NotNilFilter(_ string, v reflect.Value) bool {
switch v.Kind() {
case reflect.Chan, reflect.Func, reflect.Interface, reflect.Map, reflect.Ptr, reflect.Slice:
return !v.IsNil()
}
return true
}
func (scope *Scope) callMethod(methodName string, reflectValue reflect.Value) {
// Only get address from non-pointer
if reflectValue.CanAddr() && reflectValue.Kind() != reflect.Ptr {
reflectValue = reflectValue.Addr()
}
if methodValue := reflectValue.MethodByName(methodName); methodValue.IsValid() {
switch method := methodValue.Interface().(type) {
case func():
method()
case func(*Scope):
method(scope)
case func(*DB):
newDB := scope.NewDB()
method(newDB)
scope.Err(newDB.Error)
case func() error:
scope.Err(method())
case func(*Scope) error:
scope.Err(method(scope))
case func(*DB) error:
newDB := scope.NewDB()
scope.Err(method(newDB))
scope.Err(newDB.Error)
default:
scope.Err(fmt.Errorf("unsupported function %v", methodName))
}
}
}
// callSliceRequired returns true if CallSlice is required instead of Call.
func callSliceRequired(param reflect.Type, val reflect.Value) bool {
vt := val.Type()
for param.Kind() == reflect.Slice {
if val.Kind() == reflect.Interface {
val = reflect.ValueOf(val.Interface())
vt = val.Type()
}
if vt.Kind() != reflect.Slice {
return false
}
vt = vt.Elem()
if val.Kind() != reflect.Invalid {
if val.Len() > 0 {
val = val.Index(0)
} else {
val = reflect.Value{}
}
}
param = param.Elem()
}
return true
}
func (d *decoder) parse_unmarshaler(v reflect.Value) bool {
m, ok := v.Interface().(Unmarshaler)
if !ok {
// T doesn't work, try *T
if v.Kind() != reflect.Ptr && v.CanAddr() {
m, ok = v.Addr().Interface().(Unmarshaler)
if ok {
v = v.Addr()
}
}
}
if ok && (v.Kind() != reflect.Ptr || !v.IsNil()) {
if d.read_one_value() {
err := m.UnmarshalBencode(d.buf.Bytes())
d.buf.Reset()
if err != nil {
panic(&UnmarshalerError{v.Type(), err})
}
return true
}
d.buf.Reset()
}
return false
}
// All protocol buffer fields are nillable, but be careful.
func isNil(v reflect.Value) bool {
switch v.Kind() {
case reflect.Interface, reflect.Map, reflect.Ptr, reflect.Slice:
return v.IsNil()
}
return false
}
func visitStruct(val reflect.Value, visitor structVisitor) error {
if val.Kind() != reflect.Ptr {
return errNoPointer
}
val = reflect.Indirect(val)
if val.Kind() != reflect.Struct {
return errNoStruct
}
typ := val.Type()
for ii := 0; ii < typ.NumField(); ii++ {
field := typ.Field(ii)
fieldVal := val.Field(ii)
ptr := fieldVal.Addr().Interface()
name := defaultFieldName(field.Name)
var help string
if n := field.Tag.Get("name"); n != "" {
name = n
}
if h := field.Tag.Get("help"); h != "" {
help = h
}
if name == "" {
return fmt.Errorf("no name provided for field %s in type %s", field.Name, typ)
}
if err := visitor(name, help, &field, fieldVal, ptr); err != nil {
return err
}
}
return nil
}
func testSetNilMapsToEmpties(curr reflect.Value) {
actualCurrValue := curr
if curr.Kind() == reflect.Ptr {
actualCurrValue = curr.Elem()
}
switch actualCurrValue.Kind() {
case reflect.Map:
for _, mapKey := range actualCurrValue.MapKeys() {
currMapValue := actualCurrValue.MapIndex(mapKey)
testSetNilMapsToEmpties(currMapValue)
}
case reflect.Struct:
for fieldIndex := 0; fieldIndex < actualCurrValue.NumField(); fieldIndex++ {
currFieldValue := actualCurrValue.Field(fieldIndex)
if currFieldValue.Kind() == reflect.Map && currFieldValue.IsNil() {
newValue := reflect.MakeMap(currFieldValue.Type())
currFieldValue.Set(newValue)
} else {
testSetNilMapsToEmpties(currFieldValue.Addr())
}
}
}
}
func (q *queryParser) parseValue(v url.Values, value reflect.Value, prefix string, tag reflect.StructTag) error {
value = elemOf(value)
// no need to handle zero values
if !value.IsValid() {
return nil
}
t := tag.Get("type")
if t == "" {
switch value.Kind() {
case reflect.Struct:
t = "structure"
case reflect.Slice:
t = "list"
case reflect.Map:
t = "map"
}
}
switch t {
case "structure":
return q.parseStruct(v, value, prefix)
case "list":
return q.parseList(v, value, prefix, tag)
case "map":
return q.parseMap(v, value, prefix, tag)
default:
return q.parseScalar(v, value, prefix, tag)
}
}
func unwrap(v *reflect.Value) *reflect.Value {
if v.Kind() == reflect.Interface {
org := v.Elem() // Get rid of the wrapping interface
return &org
}
return v
}
func (p *Decoder) unmarshalArray(pval *plistValue, val reflect.Value) {
subvalues := pval.value.([]*plistValue)
var n int
if val.Kind() == reflect.Slice {
// Slice of element values.
// Grow slice.
cnt := len(subvalues) + val.Len()
if cnt >= val.Cap() {
ncap := 2 * cnt
if ncap < 4 {
ncap = 4
}
new := reflect.MakeSlice(val.Type(), val.Len(), ncap)
reflect.Copy(new, val)
val.Set(new)
}
n = val.Len()
val.SetLen(cnt)
} else if val.Kind() == reflect.Array {
if len(subvalues) > val.Cap() {
panic(fmt.Errorf("plist: attempted to unmarshal %d values into an array of size %d", len(subvalues), val.Cap()))
}
} else {
panic(&incompatibleDecodeTypeError{val.Type(), pval.kind})
}
// Recur to read element into slice.
for _, sval := range subvalues {
p.unmarshal(sval, val.Index(n))
n++
}
return
}
func (d *commonDialect) SqlTag(value reflect.Value, size int) string {
switch value.Kind() {
case reflect.Bool:
return "BOOLEAN"
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uintptr:
return "INTEGER"
case reflect.Int64, reflect.Uint64:
return "BIGINT"
case reflect.Float32, reflect.Float64:
return "FLOAT"
case reflect.String:
if size > 0 && size < 65532 {
return fmt.Sprintf("VARCHAR(%d)", size)
} else {
return "VARCHAR(65532)"
}
case reflect.Struct:
if value.Type() == timeType {
return "TIMESTAMP"
}
default:
if _, ok := value.Interface().([]byte); ok {
if size > 0 && size < 65532 {
return fmt.Sprintf("BINARY(%d)", size)
} else {
return "BINARY(65532)"
}
}
}
panic(fmt.Sprintf("invalid sql type %s (%s) for commonDialect", value.Type().Name(), value.Kind().String()))
}
func (p *Decoder) unmarshalDictionary(pval *plistValue, val reflect.Value) {
typ := val.Type()
switch val.Kind() {
case reflect.Struct:
tinfo, err := getTypeInfo(typ)
if err != nil {
panic(err)
}
subvalues := pval.value.(*dictionary).m
for _, finfo := range tinfo.fields {
p.unmarshal(subvalues[finfo.name], finfo.value(val))
}
case reflect.Map:
if val.IsNil() {
val.Set(reflect.MakeMap(typ))
}
subvalues := pval.value.(*dictionary).m
for k, sval := range subvalues {
keyv := reflect.ValueOf(k).Convert(typ.Key())
mapElem := val.MapIndex(keyv)
if !mapElem.IsValid() {
mapElem = reflect.New(typ.Elem()).Elem()
}
p.unmarshal(sval, mapElem)
val.SetMapIndex(keyv, mapElem)
}
default:
panic(&incompatibleDecodeTypeError{typ, pval.kind})
}
}
func (par *parserParser) ParseValue(ctx *parseContext, valueOf reflect.Value, location int, err *Error) int {
var v Parser
if par.ptr {
v = valueOf.Addr().Interface().(Parser)
} else {
if valueOf.Kind() == reflect.Ptr {
valueOf = reflect.New(valueOf.Type().Elem())
}
v = valueOf.Interface().(Parser)
}
l, e := v.ParseValue(ctx.str, location)
if e != nil {
switch ev := e.(type) {
case Error:
err.Location = ev.Location
err.Message = ev.Message
err.Str = ev.Str
return -1
}
err.Location = location
err.Message = e.Error()
return -1
}
location = l
if location > len(ctx.str) {
panic("Invalid parser")
}
return location
}
func (p *Decoder) unmarshalLaxString(s string, val reflect.Value) {
switch val.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
i := mustParseInt(s, 10, 64)
val.SetInt(i)
return
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
i := mustParseUint(s, 10, 64)
val.SetUint(i)
return
case reflect.Float32, reflect.Float64:
f := mustParseFloat(s, 64)
val.SetFloat(f)
return
case reflect.Bool:
b := mustParseBool(s)
val.SetBool(b)
return
case reflect.Struct:
if val.Type() == timeType {
t, err := time.Parse(textPlistTimeLayout, s)
if err != nil {
panic(err)
}
val.Set(reflect.ValueOf(t.In(time.UTC)))
return
}
fallthrough
default:
panic(&incompatibleDecodeTypeError{val.Type(), String})
}
}
func setField(field reflect.Value, defaultVal string) {
var iface interface{}
var err error
switch field.Kind() {
case reflect.Bool:
iface, err = strconv.ParseBool(defaultVal)
case reflect.Int:
iface, err = strconv.ParseInt(defaultVal, 10, 64)
iface = int(iface.(int64))
case reflect.Int8:
iface, err = strconv.ParseInt(defaultVal, 10, 8)
iface = int8(iface.(int64))
case reflect.Int16:
iface, err = strconv.ParseInt(defaultVal, 10, 16)
iface = int16(iface.(int64))
case reflect.Int32:
iface, err = strconv.ParseInt(defaultVal, 10, 32)
iface = int32(iface.(int64))
case reflect.Int64:
t, err := time.ParseDuration(defaultVal)
if err == nil {
iface, err = t, nil
} else {
iface, err = strconv.ParseInt(defaultVal, 10, 64)
}
case reflect.Uint:
iface, err = strconv.ParseUint(defaultVal, 10, 64)
iface = uint(iface.(uint64))
case reflect.Uint8:
iface, err = strconv.ParseUint(defaultVal, 10, 8)
iface = uint8(iface.(uint64))
case reflect.Uint16:
iface, err = strconv.ParseUint(defaultVal, 10, 16)
iface = uint16(iface.(uint64))
case reflect.Uint32:
iface, err = strconv.ParseUint(defaultVal, 10, 32)
iface = uint32(iface.(uint64))
case reflect.Uint64:
iface, err = strconv.ParseUint(defaultVal, 10, 64)
case reflect.Uintptr:
iface, err = strconv.ParseUint(defaultVal, 10, 64)
iface = uintptr(iface.(uint64))
case reflect.Float32:
iface, err = strconv.ParseFloat(defaultVal, 32)
iface = float32(iface.(float64))
case reflect.Float64:
iface, err = strconv.ParseFloat(defaultVal, 64)
case reflect.String:
iface = defaultVal
default:
err = errInvalidFieldType
}
if err == nil {
if field.CanSet() {
field.Set(reflect.ValueOf(iface))
}
}
}
func (q *Query) findPopulatePath(path string) {
parts := strings.Split(path, ".")
resultVal := reflect.ValueOf(q.parentStruct).Elem()
var refVal reflect.Value
partsLen := len(parts)
for i := 0; i < partsLen; i++ {
elem := parts[i]
if i == 0 {
refVal = resultVal.FieldByName(elem)
structTag, _ := resultVal.Type().FieldByName(elem)
q.popSchema = structTag.Tag.Get(q.z.modelTag)
} else if i == partsLen-1 {
structTag, _ := refVal.Type().FieldByName(elem)
q.popSchema = structTag.Tag.Get(q.z.modelTag)
refVal = refVal.FieldByName(elem)
} else {
//refVal = handleSlice(refVal, elem, path)
refVal = refVal.FieldByName(elem)
}
if !refVal.IsValid() {
panic("field `" + elem + "` not found in populate path `" + path + "`")
}
}
if refVal.Kind() == reflect.Slice {
q.isSlice = true
}
q.populateField = refVal.Interface()
}
// for insert and update
// If already assigned, then just ignore tag
func GetValQuoteStr(val reflect.Value) (string, error) {
switch val.Kind() {
case reflect.Bool:
boolStr := "N"
if val.Bool() {
boolStr = "Y"
}
return boolStr, nil
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return strconv.FormatInt(val.Int(), 10), nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return strconv.FormatUint(val.Uint(), 10), nil
case reflect.Float32, reflect.Float64:
return strconv.FormatFloat(val.Float(), 'f', -1, 64), nil
case reflect.String:
return QuoteStr(val.String()), nil
case reflect.Slice: //[]byte
if val.Type().Elem().Name() != "uint8" {
return "", fmt.Errorf("GetValQuoteStr> slicetype is not []byte: %v", val.Interface())
}
return QuoteStr(string(val.Interface().([]byte))), nil
default:
return "", fmt.Errorf("GetValQuoteStr> reflect.Value is not a string/int/uint/float/bool/[]byte!\nval: %v", val)
}
return "", nil
}
func isZero(v reflect.Value) bool {
switch v.Kind() {
case reflect.Func, reflect.Map, reflect.Slice:
return v.IsNil()
case reflect.Array:
z := true
for i := 0; i < v.Len(); i++ {
z = z && isZero(v.Index(i))
}
return z
case reflect.Struct:
if v.Type() == reflect.TypeOf(t) {
if v.Interface().(time.Time).IsZero() {
return true
}
return false
}
z := true
for i := 0; i < v.NumField(); i++ {
z = z && isZero(v.Field(i))
}
return z
}
// Compare other types directly:
z := reflect.Zero(v.Type())
return v.Interface() == z.Interface()
}
func isZero(v reflect.Value) bool {
switch v.Kind() {
case reflect.String:
return len(v.String()) == 0
case reflect.Interface, reflect.Ptr:
return v.IsNil()
case reflect.Slice:
return v.Len() == 0
case reflect.Map:
return v.Len() == 0
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return v.Int() == 0
case reflect.Float32, reflect.Float64:
return v.Float() == 0
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return v.Uint() == 0
case reflect.Bool:
return !v.Bool()
case reflect.Struct:
vt := v.Type()
for i := v.NumField() - 1; i >= 0; i-- {
if vt.Field(i).PkgPath != "" {
continue // Private field
}
if !isZero(v.Field(i)) {
return false
}
}
return true
}
return false
}
func (e *Encoder) preEncodeValue(rv reflect.Value) (rv2 reflect.Value, proceed bool) {
LOOP:
for {
switch rv.Kind() {
case reflect.Ptr, reflect.Interface:
if rv.IsNil() {
e.e.EncodeNil()
return
}
rv = rv.Elem()
continue LOOP
case reflect.Slice, reflect.Map:
if rv.IsNil() {
e.e.EncodeNil()
return
}
case reflect.Invalid, reflect.Func:
e.e.EncodeNil()
return
}
break
}
return rv, true
}