12 "github.com/anacrolix/missinggo"
15 func isEmptyValue(v reflect.Value) bool {
16 return missinggo.IsEmptyValue(v)
24 func (e *Encoder) Encode(v interface{}) (err error) {
29 if e := recover(); e != nil {
30 if _, ok := e.(runtime.Error); ok {
40 e.reflectValue(reflect.ValueOf(v))
44 type string_values []reflect.Value
46 func (sv string_values) Len() int { return len(sv) }
47 func (sv string_values) Swap(i, j int) { sv[i], sv[j] = sv[j], sv[i] }
48 func (sv string_values) Less(i, j int) bool { return sv.get(i) < sv.get(j) }
49 func (sv string_values) get(i int) string { return sv[i].String() }
51 func (e *Encoder) write(s []byte) {
52 _, err := e.w.Write(s)
58 func (e *Encoder) writeString(s string) {
60 n := copy(e.scratch[:], s)
62 e.write(e.scratch[:n])
66 func (e *Encoder) reflectString(s string) {
67 b := strconv.AppendInt(e.scratch[:0], int64(len(s)), 10)
73 func (e *Encoder) reflectByteSlice(s []byte) {
74 b := strconv.AppendInt(e.scratch[:0], int64(len(s)), 10)
80 // returns true if the value implements Marshaler interface and marshaling was
82 func (e *Encoder) reflectMarshaler(v reflect.Value) bool {
83 m, ok := v.Interface().(Marshaler)
85 // T doesn't work, try *T
86 if v.Kind() != reflect.Ptr && v.CanAddr() {
87 m, ok = v.Addr().Interface().(Marshaler)
93 if ok && (v.Kind() != reflect.Ptr || !v.IsNil()) {
94 data, err := m.MarshalBencode()
96 panic(&MarshalerError{v.Type(), err})
105 var bigIntType = reflect.TypeOf(big.Int{})
107 func (e *Encoder) reflectValue(v reflect.Value) {
109 if e.reflectMarshaler(v) {
113 if v.Type() == bigIntType {
115 bi := v.Interface().(big.Int)
116 e.writeString(bi.String())
128 case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
130 b := strconv.AppendInt(e.scratch[:0], v.Int(), 10)
133 case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
135 b := strconv.AppendUint(e.scratch[:0], v.Uint(), 10)
139 e.reflectString(v.String())
142 for _, ef := range encodeFields(v.Type()) {
143 field_value := v.Field(ef.i)
144 if ef.omit_empty && isEmptyValue(field_value) {
147 e.reflectString(ef.tag)
148 e.reflectValue(field_value)
152 if v.Type().Key().Kind() != reflect.String {
153 panic(&MarshalTypeError{v.Type()})
160 sv := string_values(v.MapKeys())
162 for _, key := range sv {
163 e.reflectString(key.String())
164 e.reflectValue(v.MapIndex(key))
172 if v.Type().Elem().Kind() == reflect.Uint8 {
174 e.reflectByteSlice(s)
180 for i, n := 0, v.Len(); i < n; i++ {
181 e.reflectValue(v.Index(i))
184 case reflect.Interface:
185 e.reflectValue(v.Elem())
188 v = reflect.Zero(v.Type().Elem())
194 panic(&MarshalTypeError{v.Type()})
198 type encodeField struct {
204 type encodeFieldsSortType []encodeField
206 func (ef encodeFieldsSortType) Len() int { return len(ef) }
207 func (ef encodeFieldsSortType) Swap(i, j int) { ef[i], ef[j] = ef[j], ef[i] }
208 func (ef encodeFieldsSortType) Less(i, j int) bool { return ef[i].tag < ef[j].tag }
211 typeCacheLock sync.RWMutex
212 encodeFieldsCache = make(map[reflect.Type][]encodeField)
215 func encodeFields(t reflect.Type) []encodeField {
216 typeCacheLock.RLock()
217 fs, ok := encodeFieldsCache[t]
218 typeCacheLock.RUnlock()
224 defer typeCacheLock.Unlock()
225 fs, ok = encodeFieldsCache[t]
230 for i, n := 0, t.NumField(); i < n; i++ {
249 ef.omit_empty = tv.OmitEmpty()
252 fss := encodeFieldsSortType(fs)
254 encodeFieldsCache[t] = fs