forked from rethinkdb/rethinkdb-go
/
decoder_types.go
529 lines (466 loc) · 11.9 KB
/
decoder_types.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
package encoding
import (
"bytes"
"fmt"
"reflect"
"strconv"
)
// newTypeDecoder constructs an decoderFunc for a type.
func newTypeDecoder(dt, st reflect.Type) decoderFunc {
if reflect.PtrTo(dt).Implements(unmarshalerType) ||
dt.Implements(unmarshalerType) {
return unmarshalerDecoder
}
if st.Kind() == reflect.Interface {
return interfaceAsTypeDecoder
}
switch dt.Kind() {
case reflect.Bool:
switch st.Kind() {
case reflect.Bool:
return boolAsBoolDecoder
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return intAsBoolDecoder
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return uintAsBoolDecoder
case reflect.Float32, reflect.Float64:
return floatAsBoolDecoder
case reflect.String:
return stringAsBoolDecoder
default:
return decodeTypeError
}
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
switch st.Kind() {
case reflect.Bool:
return boolAsIntDecoder
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return intAsIntDecoder
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return uintAsIntDecoder
case reflect.Float32, reflect.Float64:
return floatAsIntDecoder
case reflect.String:
return stringAsIntDecoder
default:
return decodeTypeError
}
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
switch st.Kind() {
case reflect.Bool:
return boolAsUintDecoder
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return intAsUintDecoder
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return uintAsUintDecoder
case reflect.Float32, reflect.Float64:
return floatAsUintDecoder
case reflect.String:
return stringAsUintDecoder
default:
return decodeTypeError
}
case reflect.Float32, reflect.Float64:
switch st.Kind() {
case reflect.Bool:
return boolAsFloatDecoder
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return intAsFloatDecoder
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return uintAsFloatDecoder
case reflect.Float32, reflect.Float64:
return floatAsFloatDecoder
case reflect.String:
return stringAsFloatDecoder
default:
return decodeTypeError
}
case reflect.String:
switch st.Kind() {
case reflect.Bool:
return boolAsStringDecoder
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return intAsStringDecoder
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return uintAsStringDecoder
case reflect.Float32, reflect.Float64:
return floatAsStringDecoder
case reflect.String:
return stringAsStringDecoder
default:
return decodeTypeError
}
case reflect.Interface:
if !st.AssignableTo(dt) {
return decodeTypeError
}
return interfaceDecoder
case reflect.Ptr:
return newPtrDecoder(dt, st)
case reflect.Map:
if st.AssignableTo(dt) {
return interfaceDecoder
}
switch st.Kind() {
case reflect.Map:
return newMapAsMapDecoder(dt, st)
default:
return decodeTypeError
}
case reflect.Struct:
if st.AssignableTo(dt) {
return interfaceDecoder
}
switch st.Kind() {
case reflect.Map:
if kind := st.Key().Kind(); kind != reflect.String && kind != reflect.Interface {
return newDecodeTypeError(fmt.Errorf("map needs string keys"))
}
return newMapAsStructDecoder(dt, st)
default:
return decodeTypeError
}
case reflect.Slice:
if st.AssignableTo(dt) {
return interfaceDecoder
}
switch st.Kind() {
case reflect.Array, reflect.Slice:
return newSliceDecoder(dt, st)
default:
return decodeTypeError
}
case reflect.Array:
if st.AssignableTo(dt) {
return interfaceDecoder
}
switch st.Kind() {
case reflect.Array, reflect.Slice:
return newArrayDecoder(dt, st)
default:
return decodeTypeError
}
default:
return unsupportedTypeDecoder
}
}
func invalidValueDecoder(dv, sv reflect.Value) {
dv.Set(reflect.Zero(dv.Type()))
}
func unsupportedTypeDecoder(dv, sv reflect.Value) {
panic(&UnsupportedTypeError{dv.Type()})
}
func decodeTypeError(dv, sv reflect.Value) {
panic(&DecodeTypeError{
DestType: dv.Type(),
SrcType: sv.Type(),
})
}
func newDecodeTypeError(err error) decoderFunc {
return func(dv, sv reflect.Value) {
panic(&DecodeTypeError{
DestType: dv.Type(),
SrcType: sv.Type(),
Reason: err.Error(),
})
}
}
func interfaceDecoder(dv, sv reflect.Value) {
dv.Set(sv)
}
func interfaceAsTypeDecoder(dv, sv reflect.Value) {
if !sv.IsNil() {
dv = indirect(dv, false)
dv.Set(reflect.Zero(dv.Type()))
decode(dv, sv.Elem())
}
}
type ptrDecoder struct {
elemDec decoderFunc
}
func (d *ptrDecoder) decode(dv, sv reflect.Value) {
v := reflect.New(dv.Type().Elem())
d.elemDec(v, sv)
dv.Set(v)
}
func newPtrDecoder(dt, st reflect.Type) decoderFunc {
dec := &ptrDecoder{typeDecoder(dt.Elem(), st)}
return dec.decode
}
func unmarshalerDecoder(dv, sv reflect.Value) {
// modeled off of https://golang.org/src/encoding/json/decode.go?#L325
if dv.Kind() != reflect.Ptr && dv.Type().Name() != "" && dv.CanAddr() {
dv = dv.Addr()
}
if dv.IsNil() {
dv.Set(reflect.New(dv.Type().Elem()))
}
u := dv.Interface().(Unmarshaler)
err := u.UnmarshalRQL(sv.Interface())
if err != nil {
panic(&DecodeTypeError{dv.Type(), sv.Type(), err.Error()})
}
}
// Boolean decoders
func boolAsBoolDecoder(dv, sv reflect.Value) {
dv.SetBool(sv.Bool())
}
func boolAsIntDecoder(dv, sv reflect.Value) {
if sv.Bool() {
dv.SetInt(1)
} else {
dv.SetInt(0)
}
}
func boolAsUintDecoder(dv, sv reflect.Value) {
if sv.Bool() {
dv.SetUint(1)
} else {
dv.SetUint(0)
}
}
func boolAsFloatDecoder(dv, sv reflect.Value) {
if sv.Bool() {
dv.SetFloat(1)
} else {
dv.SetFloat(0)
}
}
func boolAsStringDecoder(dv, sv reflect.Value) {
if sv.Bool() {
dv.SetString("1")
} else {
dv.SetString("0")
}
}
// Int decoders
func intAsBoolDecoder(dv, sv reflect.Value) {
dv.SetBool(sv.Int() != 0)
}
func intAsIntDecoder(dv, sv reflect.Value) {
dv.SetInt(sv.Int())
}
func intAsUintDecoder(dv, sv reflect.Value) {
dv.SetUint(uint64(sv.Int()))
}
func intAsFloatDecoder(dv, sv reflect.Value) {
dv.SetFloat(float64(sv.Int()))
}
func intAsStringDecoder(dv, sv reflect.Value) {
dv.SetString(strconv.FormatInt(sv.Int(), 10))
}
// Uint decoders
func uintAsBoolDecoder(dv, sv reflect.Value) {
dv.SetBool(sv.Uint() != 0)
}
func uintAsIntDecoder(dv, sv reflect.Value) {
dv.SetInt(int64(sv.Uint()))
}
func uintAsUintDecoder(dv, sv reflect.Value) {
dv.SetUint(sv.Uint())
}
func uintAsFloatDecoder(dv, sv reflect.Value) {
dv.SetFloat(float64(sv.Uint()))
}
func uintAsStringDecoder(dv, sv reflect.Value) {
dv.SetString(strconv.FormatUint(sv.Uint(), 10))
}
// Float decoders
func floatAsBoolDecoder(dv, sv reflect.Value) {
dv.SetBool(sv.Float() != 0)
}
func floatAsIntDecoder(dv, sv reflect.Value) {
dv.SetInt(int64(sv.Float()))
}
func floatAsUintDecoder(dv, sv reflect.Value) {
dv.SetUint(uint64(sv.Float()))
}
func floatAsFloatDecoder(dv, sv reflect.Value) {
dv.SetFloat(float64(sv.Float()))
}
func floatAsStringDecoder(dv, sv reflect.Value) {
dv.SetString(strconv.FormatFloat(sv.Float(), 'f', -1, 64))
}
// String decoders
func stringAsBoolDecoder(dv, sv reflect.Value) {
b, err := strconv.ParseBool(sv.String())
if err == nil {
dv.SetBool(b)
} else if sv.String() == "" {
dv.SetBool(false)
} else {
panic(&DecodeTypeError{dv.Type(), sv.Type(), err.Error()})
}
}
func stringAsIntDecoder(dv, sv reflect.Value) {
i, err := strconv.ParseInt(sv.String(), 0, dv.Type().Bits())
if err == nil {
dv.SetInt(i)
} else {
panic(&DecodeTypeError{dv.Type(), sv.Type(), err.Error()})
}
}
func stringAsUintDecoder(dv, sv reflect.Value) {
i, err := strconv.ParseUint(sv.String(), 0, dv.Type().Bits())
if err == nil {
dv.SetUint(i)
} else {
panic(&DecodeTypeError{dv.Type(), sv.Type(), err.Error()})
}
}
func stringAsFloatDecoder(dv, sv reflect.Value) {
f, err := strconv.ParseFloat(sv.String(), dv.Type().Bits())
if err == nil {
dv.SetFloat(f)
} else {
panic(&DecodeTypeError{dv.Type(), sv.Type(), err.Error()})
}
}
func stringAsStringDecoder(dv, sv reflect.Value) {
dv.SetString(sv.String())
}
// Slice/Array decoder
type sliceDecoder struct {
arrayDec decoderFunc
}
func (d *sliceDecoder) decode(dv, sv reflect.Value) {
if dv.Kind() == reflect.Slice {
dv.Set(reflect.MakeSlice(dv.Type(), dv.Len(), dv.Cap()))
}
if !sv.IsNil() {
d.arrayDec(dv, sv)
}
}
func newSliceDecoder(dt, st reflect.Type) decoderFunc {
// Byte slices get special treatment; arrays don't.
// if t.Elem().Kind() == reflect.Uint8 {
// return decodeByteSlice
// }
dec := &sliceDecoder{newArrayDecoder(dt, st)}
return dec.decode
}
type arrayDecoder struct {
elemDec decoderFunc
}
func (d *arrayDecoder) decode(dv, sv reflect.Value) {
// Iterate through the slice/array and decode each element before adding it
// to the dest slice/array
i := 0
for i < sv.Len() {
if dv.Kind() == reflect.Slice {
// Get element of array, growing if necessary.
if i >= dv.Cap() {
newcap := dv.Cap() + dv.Cap()/2
if newcap < 4 {
newcap = 4
}
newdv := reflect.MakeSlice(dv.Type(), dv.Len(), newcap)
reflect.Copy(newdv, dv)
dv.Set(newdv)
}
if i >= dv.Len() {
dv.SetLen(i + 1)
}
}
if i < dv.Len() {
// Decode into element.
d.elemDec(dv.Index(i), sv.Index(i))
}
i++
}
// Ensure that the destination is the correct size
if i < dv.Len() {
if dv.Kind() == reflect.Array {
// Array. Zero the rest.
z := reflect.Zero(dv.Type().Elem())
for ; i < dv.Len(); i++ {
dv.Index(i).Set(z)
}
} else {
dv.SetLen(i)
}
}
}
func newArrayDecoder(dt, st reflect.Type) decoderFunc {
dec := &arrayDecoder{typeDecoder(dt.Elem(), st.Elem())}
return dec.decode
}
// Map decoder
type mapAsMapDecoder struct {
keyDec, elemDec decoderFunc
}
func (d *mapAsMapDecoder) decode(dv, sv reflect.Value) {
dt := dv.Type()
dv.Set(reflect.MakeMap(reflect.MapOf(dt.Key(), dt.Elem())))
var mapKey reflect.Value
var mapElem reflect.Value
keyType := dv.Type().Key()
elemType := dv.Type().Elem()
for _, sElemKey := range sv.MapKeys() {
var dElemKey reflect.Value
var dElemVal reflect.Value
if !mapKey.IsValid() {
mapKey = reflect.New(keyType).Elem()
} else {
mapKey.Set(reflect.Zero(keyType))
}
dElemKey = mapKey
if !mapElem.IsValid() {
mapElem = reflect.New(elemType).Elem()
} else {
mapElem.Set(reflect.Zero(elemType))
}
dElemVal = mapElem
d.keyDec(dElemKey, sElemKey)
d.elemDec(dElemVal, sv.MapIndex(sElemKey))
dv.SetMapIndex(dElemKey, dElemVal)
}
}
func newMapAsMapDecoder(dt, st reflect.Type) decoderFunc {
d := &mapAsMapDecoder{typeDecoder(dt.Key(), st.Key()), typeDecoder(dt.Elem(), st.Elem())}
return d.decode
}
type mapAsStructDecoder struct {
fields []field
fieldDecs []decoderFunc
}
func (d *mapAsStructDecoder) decode(dv, sv reflect.Value) {
for _, kv := range sv.MapKeys() {
var f *field
var fieldDec decoderFunc
key := []byte(kv.String())
for i := range d.fields {
ff := &d.fields[i]
ffd := d.fieldDecs[i]
if bytes.Equal(ff.nameBytes, key) {
f = ff
fieldDec = ffd
break
}
if f == nil && ff.equalFold(ff.nameBytes, key) {
f = ff
fieldDec = ffd
}
}
if f == nil {
continue
}
dElemVal := fieldByIndex(dv, f.index)
sElemVal := sv.MapIndex(kv)
if !sElemVal.IsValid() || !dElemVal.CanSet() {
continue
}
fieldDec(dElemVal, sElemVal)
}
}
func newMapAsStructDecoder(dt, st reflect.Type) decoderFunc {
fields := cachedTypeFields(dt)
se := &mapAsStructDecoder{
fields: fields,
fieldDecs: make([]decoderFunc, len(fields)),
}
for i, f := range fields {
se.fieldDecs[i] = typeDecoder(typeByIndex(dt, f.index), st.Elem())
}
return se.decode
}