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
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
|
/*
** This currently uses snprintf() to format primitives, and could be optimized
** further.
*/
#include "upb/json/printer.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
struct upb_json_printer {
upb_sink input_;
/* BytesSink closure. */
void *subc_;
upb_bytessink *output_;
/* We track the depth so that we know when to emit startstr/endstr on the
* output. */
int depth_;
/* Have we emitted the first element? This state is necessary to emit commas
* without leaving a trailing comma in arrays/maps. We keep this state per
* frame depth.
*
* Why max_depth * 2? UPB_MAX_HANDLER_DEPTH counts depth as nested messages.
* We count frames (contexts in which we separate elements by commas) as both
* repeated fields and messages (maps), and the worst case is a
* message->repeated field->submessage->repeated field->... nesting. */
bool first_elem_[UPB_MAX_HANDLER_DEPTH * 2];
};
/* StringPiece; a pointer plus a length. */
typedef struct {
char *ptr;
size_t len;
} strpc;
void freestrpc(void *ptr) {
strpc *pc = ptr;
free(pc->ptr);
free(pc);
}
/* Convert fielddef name to JSON name and return as a string piece. */
strpc *newstrpc(upb_handlers *h, const upb_fielddef *f) {
/* TODO(haberman): handle malloc failure. */
strpc *ret = malloc(sizeof(*ret));
ret->len = upb_fielddef_getjsonname(f, NULL, 0);
ret->ptr = malloc(ret->len);
upb_fielddef_getjsonname(f, ret->ptr, ret->len);
ret->len--; /* NULL */
upb_handlers_addcleanup(h, ret, freestrpc);
return ret;
}
/* ------------ JSON string printing: values, maps, arrays ------------------ */
static void print_data(
upb_json_printer *p, const char *buf, unsigned int len) {
/* TODO: Will need to change if we support pushback from the sink. */
size_t n = upb_bytessink_putbuf(p->output_, p->subc_, buf, len, NULL);
UPB_ASSERT_VAR(n, n == len);
}
static void print_comma(upb_json_printer *p) {
if (!p->first_elem_[p->depth_]) {
print_data(p, ",", 1);
}
p->first_elem_[p->depth_] = false;
}
/* Helpers that print properly formatted elements to the JSON output stream. */
/* Used for escaping control chars in strings. */
static const char kControlCharLimit = 0x20;
UPB_INLINE bool is_json_escaped(char c) {
/* See RFC 4627. */
unsigned char uc = (unsigned char)c;
return uc < kControlCharLimit || uc == '"' || uc == '\\';
}
UPB_INLINE char* json_nice_escape(char c) {
switch (c) {
case '"': return "\\\"";
case '\\': return "\\\\";
case '\b': return "\\b";
case '\f': return "\\f";
case '\n': return "\\n";
case '\r': return "\\r";
case '\t': return "\\t";
default: return NULL;
}
}
/* Write a properly escaped string chunk. The surrounding quotes are *not*
* printed; this is so that the caller has the option of emitting the string
* content in chunks. */
static void putstring(upb_json_printer *p, const char *buf, unsigned int len) {
const char* unescaped_run = NULL;
unsigned int i;
for (i = 0; i < len; i++) {
char c = buf[i];
/* Handle escaping. */
if (is_json_escaped(c)) {
/* Use a "nice" escape, like \n, if one exists for this character. */
const char* escape = json_nice_escape(c);
/* If we don't have a specific 'nice' escape code, use a \uXXXX-style
* escape. */
char escape_buf[8];
if (!escape) {
unsigned char byte = (unsigned char)c;
_upb_snprintf(escape_buf, sizeof(escape_buf), "\\u%04x", (int)byte);
escape = escape_buf;
}
/* N.B. that we assume that the input encoding is equal to the output
* encoding (both UTF-8 for now), so for chars >= 0x20 and != \, ", we
* can simply pass the bytes through. */
/* If there's a current run of unescaped chars, print that run first. */
if (unescaped_run) {
print_data(p, unescaped_run, &buf[i] - unescaped_run);
unescaped_run = NULL;
}
/* Then print the escape code. */
print_data(p, escape, strlen(escape));
} else {
/* Add to the current unescaped run of characters. */
if (unescaped_run == NULL) {
unescaped_run = &buf[i];
}
}
}
/* If the string ended in a run of unescaped characters, print that last run. */
if (unescaped_run) {
print_data(p, unescaped_run, &buf[len] - unescaped_run);
}
}
#define CHKLENGTH(x) if (!(x)) return -1;
/* Helpers that format floating point values according to our custom formats.
* Right now we use %.8g and %.17g for float/double, respectively, to match
* proto2::util::JsonFormat's defaults. May want to change this later. */
static size_t fmt_double(double val, char* buf, size_t length) {
size_t n = _upb_snprintf(buf, length, "%.17g", val);
CHKLENGTH(n > 0 && n < length);
return n;
}
static size_t fmt_float(float val, char* buf, size_t length) {
size_t n = _upb_snprintf(buf, length, "%.8g", val);
CHKLENGTH(n > 0 && n < length);
return n;
}
static size_t fmt_bool(bool val, char* buf, size_t length) {
size_t n = _upb_snprintf(buf, length, "%s", (val ? "true" : "false"));
CHKLENGTH(n > 0 && n < length);
return n;
}
static size_t fmt_int64(long val, char* buf, size_t length) {
size_t n = _upb_snprintf(buf, length, "%ld", val);
CHKLENGTH(n > 0 && n < length);
return n;
}
static size_t fmt_uint64(unsigned long long val, char* buf, size_t length) {
size_t n = _upb_snprintf(buf, length, "%llu", val);
CHKLENGTH(n > 0 && n < length);
return n;
}
/* Print a map key given a field name. Called by scalar field handlers and by
* startseq for repeated fields. */
static bool putkey(void *closure, const void *handler_data) {
upb_json_printer *p = closure;
const strpc *key = handler_data;
print_comma(p);
print_data(p, "\"", 1);
putstring(p, key->ptr, key->len);
print_data(p, "\":", 2);
return true;
}
#define CHKFMT(val) if ((val) == (size_t)-1) return false;
#define CHK(val) if (!(val)) return false;
#define TYPE_HANDLERS(type, fmt_func) \
static bool put##type(void *closure, const void *handler_data, type val) { \
upb_json_printer *p = closure; \
char data[64]; \
size_t length = fmt_func(val, data, sizeof(data)); \
UPB_UNUSED(handler_data); \
CHKFMT(length); \
print_data(p, data, length); \
return true; \
} \
static bool scalar_##type(void *closure, const void *handler_data, \
type val) { \
CHK(putkey(closure, handler_data)); \
CHK(put##type(closure, handler_data, val)); \
return true; \
} \
static bool repeated_##type(void *closure, const void *handler_data, \
type val) { \
upb_json_printer *p = closure; \
print_comma(p); \
CHK(put##type(closure, handler_data, val)); \
return true; \
}
#define TYPE_HANDLERS_MAPKEY(type, fmt_func) \
static bool putmapkey_##type(void *closure, const void *handler_data, \
type val) { \
upb_json_printer *p = closure; \
print_data(p, "\"", 1); \
CHK(put##type(closure, handler_data, val)); \
print_data(p, "\":", 2); \
return true; \
}
TYPE_HANDLERS(double, fmt_double)
TYPE_HANDLERS(float, fmt_float)
TYPE_HANDLERS(bool, fmt_bool)
TYPE_HANDLERS(int32_t, fmt_int64)
TYPE_HANDLERS(uint32_t, fmt_int64)
TYPE_HANDLERS(int64_t, fmt_int64)
TYPE_HANDLERS(uint64_t, fmt_uint64)
/* double and float are not allowed to be map keys. */
TYPE_HANDLERS_MAPKEY(bool, fmt_bool)
TYPE_HANDLERS_MAPKEY(int32_t, fmt_int64)
TYPE_HANDLERS_MAPKEY(uint32_t, fmt_int64)
TYPE_HANDLERS_MAPKEY(int64_t, fmt_int64)
TYPE_HANDLERS_MAPKEY(uint64_t, fmt_uint64)
#undef TYPE_HANDLERS
#undef TYPE_HANDLERS_MAPKEY
typedef struct {
void *keyname;
const upb_enumdef *enumdef;
} EnumHandlerData;
static bool scalar_enum(void *closure, const void *handler_data,
int32_t val) {
const EnumHandlerData *hd = handler_data;
upb_json_printer *p = closure;
const char *symbolic_name;
CHK(putkey(closure, hd->keyname));
symbolic_name = upb_enumdef_iton(hd->enumdef, val);
if (symbolic_name) {
print_data(p, "\"", 1);
putstring(p, symbolic_name, strlen(symbolic_name));
print_data(p, "\"", 1);
} else {
putint32_t(closure, NULL, val);
}
return true;
}
static void print_enum_symbolic_name(upb_json_printer *p,
const upb_enumdef *def,
int32_t val) {
const char *symbolic_name = upb_enumdef_iton(def, val);
if (symbolic_name) {
print_data(p, "\"", 1);
putstring(p, symbolic_name, strlen(symbolic_name));
print_data(p, "\"", 1);
} else {
putint32_t(p, NULL, val);
}
}
static bool repeated_enum(void *closure, const void *handler_data,
int32_t val) {
const EnumHandlerData *hd = handler_data;
upb_json_printer *p = closure;
print_comma(p);
print_enum_symbolic_name(p, hd->enumdef, val);
return true;
}
static bool mapvalue_enum(void *closure, const void *handler_data,
int32_t val) {
const EnumHandlerData *hd = handler_data;
upb_json_printer *p = closure;
print_enum_symbolic_name(p, hd->enumdef, val);
return true;
}
static void *scalar_startsubmsg(void *closure, const void *handler_data) {
return putkey(closure, handler_data) ? closure : UPB_BREAK;
}
static void *repeated_startsubmsg(void *closure, const void *handler_data) {
upb_json_printer *p = closure;
UPB_UNUSED(handler_data);
print_comma(p);
return closure;
}
static void start_frame(upb_json_printer *p) {
p->depth_++;
p->first_elem_[p->depth_] = true;
print_data(p, "{", 1);
}
static void end_frame(upb_json_printer *p) {
print_data(p, "}", 1);
p->depth_--;
}
static bool printer_startmsg(void *closure, const void *handler_data) {
upb_json_printer *p = closure;
UPB_UNUSED(handler_data);
if (p->depth_ == 0) {
upb_bytessink_start(p->output_, 0, &p->subc_);
}
start_frame(p);
return true;
}
static bool printer_endmsg(void *closure, const void *handler_data, upb_status *s) {
upb_json_printer *p = closure;
UPB_UNUSED(handler_data);
UPB_UNUSED(s);
end_frame(p);
if (p->depth_ == 0) {
upb_bytessink_end(p->output_);
}
return true;
}
static void *startseq(void *closure, const void *handler_data) {
upb_json_printer *p = closure;
CHK(putkey(closure, handler_data));
p->depth_++;
p->first_elem_[p->depth_] = true;
print_data(p, "[", 1);
return closure;
}
static bool endseq(void *closure, const void *handler_data) {
upb_json_printer *p = closure;
UPB_UNUSED(handler_data);
print_data(p, "]", 1);
p->depth_--;
return true;
}
static void *startmap(void *closure, const void *handler_data) {
upb_json_printer *p = closure;
CHK(putkey(closure, handler_data));
p->depth_++;
p->first_elem_[p->depth_] = true;
print_data(p, "{", 1);
return closure;
}
static bool endmap(void *closure, const void *handler_data) {
upb_json_printer *p = closure;
UPB_UNUSED(handler_data);
print_data(p, "}", 1);
p->depth_--;
return true;
}
static size_t putstr(void *closure, const void *handler_data, const char *str,
size_t len, const upb_bufhandle *handle) {
upb_json_printer *p = closure;
UPB_UNUSED(handler_data);
UPB_UNUSED(handle);
putstring(p, str, len);
return len;
}
/* This has to Base64 encode the bytes, because JSON has no "bytes" type. */
static size_t putbytes(void *closure, const void *handler_data, const char *str,
size_t len, const upb_bufhandle *handle) {
upb_json_printer *p = closure;
/* This is the regular base64, not the "web-safe" version. */
static const char base64[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
/* Base64-encode. */
char data[16000];
const char *limit = data + sizeof(data);
const unsigned char *from = (const unsigned char*)str;
char *to = data;
size_t remaining = len;
size_t bytes;
UPB_UNUSED(handler_data);
UPB_UNUSED(handle);
while (remaining > 2) {
/* TODO(haberman): handle encoded lengths > sizeof(data) */
UPB_ASSERT_VAR(limit, (limit - to) >= 4);
to[0] = base64[from[0] >> 2];
to[1] = base64[((from[0] & 0x3) << 4) | (from[1] >> 4)];
to[2] = base64[((from[1] & 0xf) << 2) | (from[2] >> 6)];
to[3] = base64[from[2] & 0x3f];
remaining -= 3;
to += 4;
from += 3;
}
switch (remaining) {
case 2:
to[0] = base64[from[0] >> 2];
to[1] = base64[((from[0] & 0x3) << 4) | (from[1] >> 4)];
to[2] = base64[(from[1] & 0xf) << 2];
to[3] = '=';
to += 4;
from += 2;
break;
case 1:
to[0] = base64[from[0] >> 2];
to[1] = base64[((from[0] & 0x3) << 4)];
to[2] = '=';
to[3] = '=';
to += 4;
from += 1;
break;
}
bytes = to - data;
print_data(p, "\"", 1);
putstring(p, data, bytes);
print_data(p, "\"", 1);
return len;
}
static void *scalar_startstr(void *closure, const void *handler_data,
size_t size_hint) {
upb_json_printer *p = closure;
UPB_UNUSED(handler_data);
UPB_UNUSED(size_hint);
CHK(putkey(closure, handler_data));
print_data(p, "\"", 1);
return p;
}
static size_t scalar_str(void *closure, const void *handler_data,
const char *str, size_t len,
const upb_bufhandle *handle) {
CHK(putstr(closure, handler_data, str, len, handle));
return len;
}
static bool scalar_endstr(void *closure, const void *handler_data) {
upb_json_printer *p = closure;
UPB_UNUSED(handler_data);
print_data(p, "\"", 1);
return true;
}
static void *repeated_startstr(void *closure, const void *handler_data,
size_t size_hint) {
upb_json_printer *p = closure;
UPB_UNUSED(handler_data);
UPB_UNUSED(size_hint);
print_comma(p);
print_data(p, "\"", 1);
return p;
}
static size_t repeated_str(void *closure, const void *handler_data,
const char *str, size_t len,
const upb_bufhandle *handle) {
CHK(putstr(closure, handler_data, str, len, handle));
return len;
}
static bool repeated_endstr(void *closure, const void *handler_data) {
upb_json_printer *p = closure;
UPB_UNUSED(handler_data);
print_data(p, "\"", 1);
return true;
}
static void *mapkeyval_startstr(void *closure, const void *handler_data,
size_t size_hint) {
upb_json_printer *p = closure;
UPB_UNUSED(handler_data);
UPB_UNUSED(size_hint);
print_data(p, "\"", 1);
return p;
}
static size_t mapkey_str(void *closure, const void *handler_data,
const char *str, size_t len,
const upb_bufhandle *handle) {
CHK(putstr(closure, handler_data, str, len, handle));
return len;
}
static bool mapkey_endstr(void *closure, const void *handler_data) {
upb_json_printer *p = closure;
UPB_UNUSED(handler_data);
print_data(p, "\":", 2);
return true;
}
static bool mapvalue_endstr(void *closure, const void *handler_data) {
upb_json_printer *p = closure;
UPB_UNUSED(handler_data);
print_data(p, "\"", 1);
return true;
}
static size_t scalar_bytes(void *closure, const void *handler_data,
const char *str, size_t len,
const upb_bufhandle *handle) {
CHK(putkey(closure, handler_data));
CHK(putbytes(closure, handler_data, str, len, handle));
return len;
}
static size_t repeated_bytes(void *closure, const void *handler_data,
const char *str, size_t len,
const upb_bufhandle *handle) {
upb_json_printer *p = closure;
print_comma(p);
CHK(putbytes(closure, handler_data, str, len, handle));
return len;
}
static size_t mapkey_bytes(void *closure, const void *handler_data,
const char *str, size_t len,
const upb_bufhandle *handle) {
upb_json_printer *p = closure;
CHK(putbytes(closure, handler_data, str, len, handle));
print_data(p, ":", 1);
return len;
}
static void set_enum_hd(upb_handlers *h,
const upb_fielddef *f,
upb_handlerattr *attr) {
EnumHandlerData *hd = malloc(sizeof(EnumHandlerData));
hd->enumdef = (const upb_enumdef *)upb_fielddef_subdef(f);
hd->keyname = newstrpc(h, f);
upb_handlers_addcleanup(h, hd, free);
upb_handlerattr_sethandlerdata(attr, hd);
}
/* Set up handlers for a mapentry submessage (i.e., an individual key/value pair
* in a map).
*
* TODO: Handle missing key, missing value, out-of-order key/value, or repeated
* key or value cases properly. The right way to do this is to allocate a
* temporary structure at the start of a mapentry submessage, store key and
* value data in it as key and value handlers are called, and then print the
* key/value pair once at the end of the submessage. If we don't do this, we
* should at least detect the case and throw an error. However, so far all of
* our sources that emit mapentry messages do so canonically (with one key
* field, and then one value field), so this is not a pressing concern at the
* moment. */
void printer_sethandlers_mapentry(const void *closure, upb_handlers *h) {
const upb_msgdef *md = upb_handlers_msgdef(h);
/* A mapentry message is printed simply as '"key": value'. Rather than
* special-case key and value for every type below, we just handle both
* fields explicitly here. */
const upb_fielddef* key_field = upb_msgdef_itof(md, UPB_MAPENTRY_KEY);
const upb_fielddef* value_field = upb_msgdef_itof(md, UPB_MAPENTRY_VALUE);
upb_handlerattr empty_attr = UPB_HANDLERATTR_INITIALIZER;
UPB_UNUSED(closure);
switch (upb_fielddef_type(key_field)) {
case UPB_TYPE_INT32:
upb_handlers_setint32(h, key_field, putmapkey_int32_t, &empty_attr);
break;
case UPB_TYPE_INT64:
upb_handlers_setint64(h, key_field, putmapkey_int64_t, &empty_attr);
break;
case UPB_TYPE_UINT32:
upb_handlers_setuint32(h, key_field, putmapkey_uint32_t, &empty_attr);
break;
case UPB_TYPE_UINT64:
upb_handlers_setuint64(h, key_field, putmapkey_uint64_t, &empty_attr);
break;
case UPB_TYPE_BOOL:
upb_handlers_setbool(h, key_field, putmapkey_bool, &empty_attr);
break;
case UPB_TYPE_STRING:
upb_handlers_setstartstr(h, key_field, mapkeyval_startstr, &empty_attr);
upb_handlers_setstring(h, key_field, mapkey_str, &empty_attr);
upb_handlers_setendstr(h, key_field, mapkey_endstr, &empty_attr);
break;
case UPB_TYPE_BYTES:
upb_handlers_setstring(h, key_field, mapkey_bytes, &empty_attr);
break;
default:
assert(false);
break;
}
switch (upb_fielddef_type(value_field)) {
case UPB_TYPE_INT32:
upb_handlers_setint32(h, value_field, putint32_t, &empty_attr);
break;
case UPB_TYPE_INT64:
upb_handlers_setint64(h, value_field, putint64_t, &empty_attr);
break;
case UPB_TYPE_UINT32:
upb_handlers_setuint32(h, value_field, putuint32_t, &empty_attr);
break;
case UPB_TYPE_UINT64:
upb_handlers_setuint64(h, value_field, putuint64_t, &empty_attr);
break;
case UPB_TYPE_BOOL:
upb_handlers_setbool(h, value_field, putbool, &empty_attr);
break;
case UPB_TYPE_FLOAT:
upb_handlers_setfloat(h, value_field, putfloat, &empty_attr);
break;
case UPB_TYPE_DOUBLE:
upb_handlers_setdouble(h, value_field, putdouble, &empty_attr);
break;
case UPB_TYPE_STRING:
upb_handlers_setstartstr(h, value_field, mapkeyval_startstr, &empty_attr);
upb_handlers_setstring(h, value_field, putstr, &empty_attr);
upb_handlers_setendstr(h, value_field, mapvalue_endstr, &empty_attr);
break;
case UPB_TYPE_BYTES:
upb_handlers_setstring(h, value_field, putbytes, &empty_attr);
break;
case UPB_TYPE_ENUM: {
upb_handlerattr enum_attr = UPB_HANDLERATTR_INITIALIZER;
set_enum_hd(h, value_field, &enum_attr);
upb_handlers_setint32(h, value_field, mapvalue_enum, &enum_attr);
upb_handlerattr_uninit(&enum_attr);
break;
}
case UPB_TYPE_MESSAGE:
/* No handler necessary -- the submsg handlers will print the message
* as appropriate. */
break;
}
upb_handlerattr_uninit(&empty_attr);
}
void printer_sethandlers(const void *closure, upb_handlers *h) {
const upb_msgdef *md = upb_handlers_msgdef(h);
bool is_mapentry = upb_msgdef_mapentry(md);
upb_handlerattr empty_attr = UPB_HANDLERATTR_INITIALIZER;
upb_msg_field_iter i;
UPB_UNUSED(closure);
if (is_mapentry) {
/* mapentry messages are sufficiently different that we handle them
* separately. */
printer_sethandlers_mapentry(closure, h);
return;
}
upb_handlers_setstartmsg(h, printer_startmsg, &empty_attr);
upb_handlers_setendmsg(h, printer_endmsg, &empty_attr);
#define TYPE(type, name, ctype) \
case type: \
if (upb_fielddef_isseq(f)) { \
upb_handlers_set##name(h, f, repeated_##ctype, &empty_attr); \
} else { \
upb_handlers_set##name(h, f, scalar_##ctype, &name_attr); \
} \
break;
upb_msg_field_begin(&i, md);
for(; !upb_msg_field_done(&i); upb_msg_field_next(&i)) {
const upb_fielddef *f = upb_msg_iter_field(&i);
upb_handlerattr name_attr = UPB_HANDLERATTR_INITIALIZER;
upb_handlerattr_sethandlerdata(&name_attr, newstrpc(h, f));
if (upb_fielddef_ismap(f)) {
upb_handlers_setstartseq(h, f, startmap, &name_attr);
upb_handlers_setendseq(h, f, endmap, &name_attr);
} else if (upb_fielddef_isseq(f)) {
upb_handlers_setstartseq(h, f, startseq, &name_attr);
upb_handlers_setendseq(h, f, endseq, &empty_attr);
}
switch (upb_fielddef_type(f)) {
TYPE(UPB_TYPE_FLOAT, float, float);
TYPE(UPB_TYPE_DOUBLE, double, double);
TYPE(UPB_TYPE_BOOL, bool, bool);
TYPE(UPB_TYPE_INT32, int32, int32_t);
TYPE(UPB_TYPE_UINT32, uint32, uint32_t);
TYPE(UPB_TYPE_INT64, int64, int64_t);
TYPE(UPB_TYPE_UINT64, uint64, uint64_t);
case UPB_TYPE_ENUM: {
/* For now, we always emit symbolic names for enums. We may want an
* option later to control this behavior, but we will wait for a real
* need first. */
upb_handlerattr enum_attr = UPB_HANDLERATTR_INITIALIZER;
set_enum_hd(h, f, &enum_attr);
if (upb_fielddef_isseq(f)) {
upb_handlers_setint32(h, f, repeated_enum, &enum_attr);
} else {
upb_handlers_setint32(h, f, scalar_enum, &enum_attr);
}
upb_handlerattr_uninit(&enum_attr);
break;
}
case UPB_TYPE_STRING:
if (upb_fielddef_isseq(f)) {
upb_handlers_setstartstr(h, f, repeated_startstr, &empty_attr);
upb_handlers_setstring(h, f, repeated_str, &empty_attr);
upb_handlers_setendstr(h, f, repeated_endstr, &empty_attr);
} else {
upb_handlers_setstartstr(h, f, scalar_startstr, &name_attr);
upb_handlers_setstring(h, f, scalar_str, &empty_attr);
upb_handlers_setendstr(h, f, scalar_endstr, &empty_attr);
}
break;
case UPB_TYPE_BYTES:
/* XXX: this doesn't support strings that span buffers yet. The base64
* encoder will need to be made resumable for this to work properly. */
if (upb_fielddef_isseq(f)) {
upb_handlers_setstring(h, f, repeated_bytes, &empty_attr);
} else {
upb_handlers_setstring(h, f, scalar_bytes, &name_attr);
}
break;
case UPB_TYPE_MESSAGE:
if (upb_fielddef_isseq(f)) {
upb_handlers_setstartsubmsg(h, f, repeated_startsubmsg, &name_attr);
} else {
upb_handlers_setstartsubmsg(h, f, scalar_startsubmsg, &name_attr);
}
break;
}
upb_handlerattr_uninit(&name_attr);
}
upb_handlerattr_uninit(&empty_attr);
#undef TYPE
}
static void json_printer_reset(upb_json_printer *p) {
p->depth_ = 0;
}
/* Public API *****************************************************************/
upb_json_printer *upb_json_printer_create(upb_env *e, const upb_handlers *h,
upb_bytessink *output) {
#ifndef NDEBUG
size_t size_before = upb_env_bytesallocated(e);
#endif
upb_json_printer *p = upb_env_malloc(e, sizeof(upb_json_printer));
if (!p) return NULL;
p->output_ = output;
json_printer_reset(p);
upb_sink_reset(&p->input_, h, p);
/* If this fails, increase the value in printer.h. */
assert(upb_env_bytesallocated(e) - size_before <= UPB_JSON_PRINTER_SIZE);
return p;
}
upb_sink *upb_json_printer_input(upb_json_printer *p) {
return &p->input_;
}
const upb_handlers *upb_json_printer_newhandlers(const upb_msgdef *md,
const void *owner) {
return upb_handlers_newfrozen(md, owner, printer_sethandlers, NULL);
}
|