Repository navigation
Expand file tree
/
Copy path_json.c
More file actions
2419 lines (2239 loc) · 77 KB
/
Copy path_json.c
File metadata and controls
2419 lines (2239 loc) · 77 KB
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
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
#include "Python.h"
#include "structmember.h"
#if PY_VERSION_HEX < 0x02060000 && !defined(Py_TYPE)
#define Py_TYPE(ob) (((PyObject*)(ob))->ob_type)
#endif
#if PY_VERSION_HEX < 0x02050000 && !defined(PY_SSIZE_T_MIN)
typedef int Py_ssize_t;
#define PY_SSIZE_T_MAX INT_MAX
#define PY_SSIZE_T_MIN INT_MIN
#define PyInt_FromSsize_t PyInt_FromLong
#define PyInt_AsSsize_t PyInt_AsLong
#endif
#ifndef Py_IS_FINITE
#define Py_IS_FINITE(X) (!Py_IS_INFINITY(X) && !Py_IS_NAN(X))
#endif
#ifdef __GNUC__
#define UNUSED __attribute__((__unused__))
#else
#define UNUSED
#endif
#define DEFAULT_ENCODING "utf-8"
#define PyScanner_Check(op) PyObject_TypeCheck(op, &PyScannerType)
#define PyScanner_CheckExact(op) (Py_TYPE(op) == &PyScannerType)
#define PyEncoder_Check(op) PyObject_TypeCheck(op, &PyEncoderType)
#define PyEncoder_CheckExact(op) (Py_TYPE(op) == &PyEncoderType)
static PyTypeObject PyScannerType;
static PyTypeObject PyEncoderType;
typedef struct _PyScannerObject {
PyObject_HEAD
PyObject *encoding;
PyObject *strict;
PyObject *object_hook;
PyObject *pairs_hook;
PyObject *parse_float;
PyObject *parse_int;
PyObject *parse_constant;
} PyScannerObject;
static PyMemberDef scanner_members[] = {
{"encoding", T_OBJECT, offsetof(PyScannerObject, encoding), READONLY, "encoding"},
{"strict", T_OBJECT, offsetof(PyScannerObject, strict), READONLY, "strict"},
{"object_hook", T_OBJECT, offsetof(PyScannerObject, object_hook), READONLY, "object_hook"},
{"object_pairs_hook", T_OBJECT, offsetof(PyScannerObject, pairs_hook), READONLY, "object_pairs_hook"},
{"parse_float", T_OBJECT, offsetof(PyScannerObject, parse_float), READONLY, "parse_float"},
{"parse_int", T_OBJECT, offsetof(PyScannerObject, parse_int), READONLY, "parse_int"},
{"parse_constant", T_OBJECT, offsetof(PyScannerObject, parse_constant), READONLY, "parse_constant"},
{NULL}
};
typedef struct _PyEncoderObject {
PyObject_HEAD
PyObject *markers;
PyObject *defaultfn;
PyObject *encoder;
PyObject *indent;
PyObject *key_separator;
PyObject *item_separator;
PyObject *sort_keys;
PyObject *skipkeys;
int fast_encode;
int allow_nan;
} PyEncoderObject;
static PyMemberDef encoder_members[] = {
{"markers", T_OBJECT, offsetof(PyEncoderObject, markers), READONLY, "markers"},
{"default", T_OBJECT, offsetof(PyEncoderObject, defaultfn), READONLY, "default"},
{"encoder", T_OBJECT, offsetof(PyEncoderObject, encoder), READONLY, "encoder"},
{"indent", T_OBJECT, offsetof(PyEncoderObject, indent), READONLY, "indent"},
{"key_separator", T_OBJECT, offsetof(PyEncoderObject, key_separator), READONLY, "key_separator"},
{"item_separator", T_OBJECT, offsetof(PyEncoderObject, item_separator), READONLY, "item_separator"},
{"sort_keys", T_OBJECT, offsetof(PyEncoderObject, sort_keys), READONLY, "sort_keys"},
{"skipkeys", T_OBJECT, offsetof(PyEncoderObject, skipkeys), READONLY, "skipkeys"},
{NULL}
};
static Py_ssize_t
ascii_escape_char(Py_UNICODE c, char *output, Py_ssize_t chars);
static PyObject *
ascii_escape_unicode(PyObject *pystr);
static PyObject *
ascii_escape_str(PyObject *pystr);
static PyObject *
py_encode_basestring_ascii(PyObject* self UNUSED, PyObject *pystr);
void init_json(void);
static PyObject *
scan_once_str(PyScannerObject *s, PyObject *pystr, Py_ssize_t idx, Py_ssize_t *next_idx_ptr);
static PyObject *
scan_once_unicode(PyScannerObject *s, PyObject *pystr, Py_ssize_t idx, Py_ssize_t *next_idx_ptr);
static PyObject *
_build_rval_index_tuple(PyObject *rval, Py_ssize_t idx);
static PyObject *
scanner_new(PyTypeObject *type, PyObject *args, PyObject *kwds);
static void
scanner_dealloc(PyObject *self);
static int
scanner_clear(PyObject *self);
static PyObject *
encoder_new(PyTypeObject *type, PyObject *args, PyObject *kwds);
static void
encoder_dealloc(PyObject *self);
static int
encoder_clear(PyObject *self);
static int
encoder_listencode_list(PyEncoderObject *s, PyObject *rval, PyObject *seq, Py_ssize_t indent_level);
static int
encoder_listencode_obj(PyEncoderObject *s, PyObject *rval, PyObject *obj, Py_ssize_t indent_level);
static int
encoder_listencode_dict(PyEncoderObject *s, PyObject *rval, PyObject *dct, Py_ssize_t indent_level);
static PyObject *
_encoded_const(PyObject *obj);
static void
raise_errmsg(char *msg, PyObject *s, Py_ssize_t end);
static PyObject *
encoder_encode_string(PyEncoderObject *s, PyObject *obj);
static int
_convertPyInt_AsSsize_t(PyObject *o, Py_ssize_t *size_ptr);
static PyObject *
_convertPyInt_FromSsize_t(Py_ssize_t *size_ptr);
static PyObject *
encoder_encode_float(PyEncoderObject *s, PyObject *obj);
#define S_CHAR(c) (c >= ' ' && c <= '~' && c != '\\' && c != '"')
#define IS_WHITESPACE(c) (((c) == ' ') || ((c) == '\t') || ((c) == '\n') || ((c) == '\r'))
#define MIN_EXPANSION 6
#ifdef Py_UNICODE_WIDE
#define MAX_EXPANSION (2 * MIN_EXPANSION)
#else
#define MAX_EXPANSION MIN_EXPANSION
#endif
static int
_convertPyInt_AsSsize_t(PyObject *o, Py_ssize_t *size_ptr)
{
/* PyObject to Py_ssize_t converter */
*size_ptr = PyInt_AsSsize_t(o);
if (*size_ptr == -1 && PyErr_Occurred())
return 0;
return 1;
}
static PyObject *
_convertPyInt_FromSsize_t(Py_ssize_t *size_ptr)
{
/* Py_ssize_t to PyObject converter */
return PyInt_FromSsize_t(*size_ptr);
}
static Py_ssize_t
ascii_escape_char(Py_UNICODE c, char *output, Py_ssize_t chars)
{
/* Escape unicode code point c to ASCII escape sequences
in char *output. output must have at least 12 bytes unused to
accommodate an escaped surrogate pair "\uXXXX\uXXXX" */
output[chars++] = '\\';
switch (c) {
case '\\': output[chars++] = (char)c; break;
case '"': output[chars++] = (char)c; break;
case '\b': output[chars++] = 'b'; break;
case '\f': output[chars++] = 'f'; break;
case '\n': output[chars++] = 'n'; break;
case '\r': output[chars++] = 'r'; break;
case '\t': output[chars++] = 't'; break;
default:
#ifdef Py_UNICODE_WIDE
if (c >= 0x10000) {
/* UTF-16 surrogate pair */
Py_UNICODE v = c - 0x10000;
c = 0xd800 | ((v >> 10) & 0x3ff);
output[chars++] = 'u';
output[chars++] = "0123456789abcdef"[(c >> 12) & 0xf];
output[chars++] = "0123456789abcdef"[(c >> 8) & 0xf];
output[chars++] = "0123456789abcdef"[(c >> 4) & 0xf];
output[chars++] = "0123456789abcdef"[(c ) & 0xf];
c = 0xdc00 | (v & 0x3ff);
output[chars++] = '\\';
}
#endif
output[chars++] = 'u';
output[chars++] = "0123456789abcdef"[(c >> 12) & 0xf];
output[chars++] = "0123456789abcdef"[(c >> 8) & 0xf];
output[chars++] = "0123456789abcdef"[(c >> 4) & 0xf];
output[chars++] = "0123456789abcdef"[(c ) & 0xf];
}
return chars;
}
static PyObject *
ascii_escape_unicode(PyObject *pystr)
{
/* Take a PyUnicode pystr and return a new ASCII-only escaped PyString */
Py_ssize_t i;
Py_ssize_t input_chars;
Py_ssize_t output_size;
Py_ssize_t max_output_size;
Py_ssize_t chars;
Py_ssize_t incr;
PyObject *rval;
char *output;
Py_UNICODE *input_unicode;
input_chars = PyUnicode_GET_SIZE(pystr);
input_unicode = PyUnicode_AS_UNICODE(pystr);
output_size = input_chars;
incr = 2; /* for quotes */
/* One char input can be up to 6 chars output, estimate 4 of these */
incr += MIN_EXPANSION * 4;
if (PY_SSIZE_T_MAX - incr < output_size) {
PyErr_NoMemory();
return NULL;
}
output_size += incr;
if (PY_SSIZE_T_MAX / MAX_EXPANSION < input_chars ||
PY_SSIZE_T_MAX - 2 < input_chars * MAX_EXPANSION)
max_output_size = PY_SSIZE_T_MAX;
else
max_output_size = 2 + (input_chars * MAX_EXPANSION);
rval = PyString_FromStringAndSize(NULL, output_size);
if (rval == NULL) {
return NULL;
}
output = PyString_AS_STRING(rval);
chars = 0;
output[chars++] = '"';
for (i = 0; i < input_chars; i++) {
Py_UNICODE c = input_unicode[i];
if (S_CHAR(c)) {
output[chars++] = (char)c;
}
else {
chars = ascii_escape_char(c, output, chars);
}
if (output_size - chars < (1 + MAX_EXPANSION)) {
if (output_size == PY_SSIZE_T_MAX) {
Py_DECREF(rval);
PyErr_NoMemory();
return NULL;
}
/* There's more than four, so let's resize by a lot */
if (PY_SSIZE_T_MAX / 2 >= output_size && output_size * 2 < max_output_size)
output_size *= 2;
else
output_size = max_output_size;
if (_PyString_Resize(&rval, output_size) == -1) {
return NULL;
}
output = PyString_AS_STRING(rval);
}
}
output[chars++] = '"';
if (_PyString_Resize(&rval, chars) == -1) {
return NULL;
}
return rval;
}
static PyObject *
ascii_escape_str(PyObject *pystr)
{
/* Take a PyString pystr and return a new ASCII-only escaped PyString */
Py_ssize_t i;
Py_ssize_t input_chars;
Py_ssize_t output_size;
Py_ssize_t max_output_size;
Py_ssize_t chars;
Py_ssize_t incr;
PyObject *rval;
char *output;
char *input_str;
input_chars = PyString_GET_SIZE(pystr);
input_str = PyString_AS_STRING(pystr);
/* Fast path for a string that's already ASCII */
for (i = 0; i < input_chars; i++) {
Py_UNICODE c = (Py_UNICODE)(unsigned char)input_str[i];
if (!S_CHAR(c)) {
/* If we have to escape something, scan the string for unicode */
Py_ssize_t j;
for (j = i; j < input_chars; j++) {
c = (Py_UNICODE)(unsigned char)input_str[j];
if (c > 0x7f) {
/* We hit a non-ASCII character, bail to unicode mode */
PyObject *uni;
uni = PyUnicode_DecodeUTF8(input_str, input_chars, "strict");
if (uni == NULL) {
return NULL;
}
rval = ascii_escape_unicode(uni);
Py_DECREF(uni);
return rval;
}
}
break;
}
}
output_size = input_chars;
incr = 2; /* for quotes */
if (i != input_chars) {
/* One char input can be up to 6 chars output, estimate 4 of these */
incr += MIN_EXPANSION * 4;
}
if (PY_SSIZE_T_MAX - incr < output_size) {
PyErr_NoMemory();
return NULL;
}
output_size += incr;
if (PY_SSIZE_T_MAX / MIN_EXPANSION < input_chars ||
PY_SSIZE_T_MAX - 2 < input_chars * MIN_EXPANSION)
max_output_size = PY_SSIZE_T_MAX;
else
max_output_size = 2 + (input_chars * MIN_EXPANSION);
rval = PyString_FromStringAndSize(NULL, output_size);
if (rval == NULL) {
return NULL;
}
output = PyString_AS_STRING(rval);
output[0] = '"';
/* We know that everything up to i is ASCII already */
chars = i + 1;
memcpy(&output[1], input_str, i);
for (; i < input_chars; i++) {
Py_UNICODE c = (Py_UNICODE)(unsigned char)input_str[i];
if (S_CHAR(c)) {
output[chars++] = (char)c;
}
else {
chars = ascii_escape_char(c, output, chars);
}
/* An ASCII char can't possibly expand to a surrogate! */
if (output_size - chars < (1 + MIN_EXPANSION)) {
if (output_size == PY_SSIZE_T_MAX) {
Py_DECREF(rval);
PyErr_NoMemory();
return NULL;
}
/* There's more than four, so let's resize by a lot */
if (PY_SSIZE_T_MAX / 2 >= output_size && output_size * 2 < max_output_size)
output_size *= 2;
else
output_size = max_output_size;
if (_PyString_Resize(&rval, output_size) == -1) {
return NULL;
}
output = PyString_AS_STRING(rval);
}
}
output[chars++] = '"';
if (_PyString_Resize(&rval, chars) == -1) {
return NULL;
}
return rval;
}
static void
raise_errmsg(char *msg, PyObject *s, Py_ssize_t end)
{
/* Use the Python function json.decoder.errmsg to raise a nice
looking ValueError exception */
static PyObject *errmsg_fn = NULL;
PyObject *pymsg;
if (errmsg_fn == NULL) {
PyObject *decoder = PyImport_ImportModule("json.decoder");
if (decoder == NULL)
return;
errmsg_fn = PyObject_GetAttrString(decoder, "errmsg");
Py_DECREF(decoder);
if (errmsg_fn == NULL)
return;
}
pymsg = PyObject_CallFunction(errmsg_fn, "(zOO&)", msg, s, _convertPyInt_FromSsize_t, &end);
if (pymsg) {
PyErr_SetObject(PyExc_ValueError, pymsg);
Py_DECREF(pymsg);
}
}
static PyObject *
join_list_unicode(PyObject *lst)
{
/* return u''.join(lst) */
static PyObject *joinfn = NULL;
if (joinfn == NULL) {
PyObject *ustr = PyUnicode_FromUnicode(NULL, 0);
if (ustr == NULL)
return NULL;
joinfn = PyObject_GetAttrString(ustr, "join");
Py_DECREF(ustr);
if (joinfn == NULL)
return NULL;
}
return PyObject_CallFunctionObjArgs(joinfn, lst, NULL);
}
static PyObject *
_build_rval_index_tuple(PyObject *rval, Py_ssize_t idx) {
/* return (rval, idx) tuple, stealing reference to rval */
PyObject *tpl;
PyObject *pyidx;
/*
steal a reference to rval, returns (rval, idx)
*/
if (rval == NULL) {
return NULL;
}
pyidx = PyInt_FromSsize_t(idx);
if (pyidx == NULL) {
Py_DECREF(rval);
return NULL;
}
tpl = PyTuple_New(2);
if (tpl == NULL) {
Py_DECREF(pyidx);
Py_DECREF(rval);
return NULL;
}
PyTuple_SET_ITEM(tpl, 0, rval);
PyTuple_SET_ITEM(tpl, 1, pyidx);
return tpl;
}
static PyObject *
scanstring_str(PyObject *pystr, Py_ssize_t end, char *encoding, int strict, Py_ssize_t *next_end_ptr)
{
/* Read the JSON string from PyString pystr.
end is the index of the first character after the quote.
encoding is the encoding of pystr (must be an ASCII superset)
if strict is zero then literal control characters are allowed
*next_end_ptr is a return-by-reference index of the character
after the end quote
Return value is a new PyString (if ASCII-only) or PyUnicode
*/
PyObject *rval;
Py_ssize_t len = PyString_GET_SIZE(pystr);
Py_ssize_t begin = end - 1;
Py_ssize_t next;
char *buf = PyString_AS_STRING(pystr);
PyObject *chunks = PyList_New(0);
if (chunks == NULL) {
goto bail;
}
if (end < 0 || len <= end) {
PyErr_SetString(PyExc_ValueError, "end is out of bounds");
goto bail;
}
while (1) {
/* Find the end of the string or the next escape */
Py_UNICODE c = 0;
PyObject *chunk = NULL;
for (next = end; next < len; next++) {
c = (unsigned char)buf[next];
if (c == '"' || c == '\\') {
break;
}
else if (strict && c <= 0x1f) {
raise_errmsg("Invalid control character at", pystr, next);
goto bail;
}
}
if (!(c == '"' || c == '\\')) {
raise_errmsg("Unterminated string starting at", pystr, begin);
goto bail;
}
/* Pick up this chunk if it's not zero length */
if (next != end) {
PyObject *strchunk = PyString_FromStringAndSize(&buf[end], next - end);
if (strchunk == NULL) {
goto bail;
}
chunk = PyUnicode_FromEncodedObject(strchunk, encoding, NULL);
Py_DECREF(strchunk);
if (chunk == NULL) {
goto bail;
}
if (PyList_Append(chunks, chunk)) {
Py_DECREF(chunk);
goto bail;
}
Py_DECREF(chunk);
}
next++;
if (c == '"') {
end = next;
break;
}
if (next == len) {
raise_errmsg("Unterminated string starting at", pystr, begin);
goto bail;
}
c = buf[next];
if (c != 'u') {
/* Non-unicode backslash escapes */
end = next + 1;
switch (c) {
case '"': break;
case '\\': break;
case '/': break;
case 'b': c = '\b'; break;
case 'f': c = '\f'; break;
case 'n': c = '\n'; break;
case 'r': c = '\r'; break;
case 't': c = '\t'; break;
default: c = 0;
}
if (c == 0) {
raise_errmsg("Invalid \\escape", pystr, end - 2);
goto bail;
}
}
else {
c = 0;
next++;
end = next + 4;
if (end >= len) {
raise_errmsg("Invalid \\uXXXX escape", pystr, next - 1);
goto bail;
}
/* Decode 4 hex digits */
for (; next < end; next++) {
Py_UNICODE digit = buf[next];
c <<= 4;
switch (digit) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
c |= (digit - '0'); break;
case 'a': case 'b': case 'c': case 'd': case 'e':
case 'f':
c |= (digit - 'a' + 10); break;
case 'A': case 'B': case 'C': case 'D': case 'E':
case 'F':
c |= (digit - 'A' + 10); break;
default:
raise_errmsg("Invalid \\uXXXX escape", pystr, end - 5);
goto bail;
}
}
#ifdef Py_UNICODE_WIDE
/* Surrogate pair */
if ((c & 0xfc00) == 0xd800 && end + 6 < len &&
buf[next++] == '\\' &&
buf[next++] == 'u') {
Py_UNICODE c2 = 0;
end += 6;
/* Decode 4 hex digits */
for (; next < end; next++) {
Py_UNICODE digit = buf[next];
c2 <<= 4;
switch (digit) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
c2 |= (digit - '0'); break;
case 'a': case 'b': case 'c': case 'd': case 'e':
case 'f':
c2 |= (digit - 'a' + 10); break;
case 'A': case 'B': case 'C': case 'D': case 'E':
case 'F':
c2 |= (digit - 'A' + 10); break;
default:
raise_errmsg("Invalid \\uXXXX escape", pystr, end - 5);
goto bail;
}
}
if ((c2 & 0xfc00) == 0xdc00)
c = 0x10000 + (((c - 0xd800) << 10) | (c2 - 0xdc00));
else
end -= 6;
}
#endif
}
chunk = PyUnicode_FromUnicode(&c, 1);
if (chunk == NULL) {
goto bail;
}
if (PyList_Append(chunks, chunk)) {
Py_DECREF(chunk);
goto bail;
}
Py_DECREF(chunk);
}
rval = join_list_unicode(chunks);
if (rval == NULL) {
goto bail;
}
Py_CLEAR(chunks);
*next_end_ptr = end;
return rval;
bail:
*next_end_ptr = -1;
Py_XDECREF(chunks);
return NULL;
}
static PyObject *
scanstring_unicode(PyObject *pystr, Py_ssize_t end, int strict, Py_ssize_t *next_end_ptr)
{
/* Read the JSON string from PyUnicode pystr.
end is the index of the first character after the quote.
if strict is zero then literal control characters are allowed
*next_end_ptr is a return-by-reference index of the character
after the end quote
Return value is a new PyUnicode
*/
PyObject *rval;
Py_ssize_t len = PyUnicode_GET_SIZE(pystr);
Py_ssize_t begin = end - 1;
Py_ssize_t next;
const Py_UNICODE *buf = PyUnicode_AS_UNICODE(pystr);
PyObject *chunks = PyList_New(0);
if (chunks == NULL) {
goto bail;
}
if (end < 0 || len <= end) {
PyErr_SetString(PyExc_ValueError, "end is out of bounds");
goto bail;
}
while (1) {
/* Find the end of the string or the next escape */
Py_UNICODE c = 0;
PyObject *chunk = NULL;
for (next = end; next < len; next++) {
c = buf[next];
if (c == '"' || c == '\\') {
break;
}
else if (strict && c <= 0x1f) {
raise_errmsg("Invalid control character at", pystr, next);
goto bail;
}
}
if (!(c == '"' || c == '\\')) {
raise_errmsg("Unterminated string starting at", pystr, begin);
goto bail;
}
/* Pick up this chunk if it's not zero length */
if (next != end) {
chunk = PyUnicode_FromUnicode(&buf[end], next - end);
if (chunk == NULL) {
goto bail;
}
if (PyList_Append(chunks, chunk)) {
Py_DECREF(chunk);
goto bail;
}
Py_DECREF(chunk);
}
next++;
if (c == '"') {
end = next;
break;
}
if (next == len) {
raise_errmsg("Unterminated string starting at", pystr, begin);
goto bail;
}
c = buf[next];
if (c != 'u') {
/* Non-unicode backslash escapes */
end = next + 1;
switch (c) {
case '"': break;
case '\\': break;
case '/': break;
case 'b': c = '\b'; break;
case 'f': c = '\f'; break;
case 'n': c = '\n'; break;
case 'r': c = '\r'; break;
case 't': c = '\t'; break;
default: c = 0;
}
if (c == 0) {
raise_errmsg("Invalid \\escape", pystr, end - 2);
goto bail;
}
}
else {
c = 0;
next++;
end = next + 4;
if (end >= len) {
raise_errmsg("Invalid \\uXXXX escape", pystr, next - 1);
goto bail;
}
/* Decode 4 hex digits */
for (; next < end; next++) {
Py_UNICODE digit = buf[next];
c <<= 4;
switch (digit) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
c |= (digit - '0'); break;
case 'a': case 'b': case 'c': case 'd': case 'e':
case 'f':
c |= (digit - 'a' + 10); break;
case 'A': case 'B': case 'C': case 'D': case 'E':
case 'F':
c |= (digit - 'A' + 10); break;
default:
raise_errmsg("Invalid \\uXXXX escape", pystr, end - 5);
goto bail;
}
}
#ifdef Py_UNICODE_WIDE
/* Surrogate pair */
if ((c & 0xfc00) == 0xd800 && end + 6 < len &&
buf[next++] == '\\' && buf[next++] == 'u') {
Py_UNICODE c2 = 0;
end += 6;
/* Decode 4 hex digits */
for (; next < end; next++) {
Py_UNICODE digit = buf[next];
c2 <<= 4;
switch (digit) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
c2 |= (digit - '0'); break;
case 'a': case 'b': case 'c': case 'd': case 'e':
case 'f':
c2 |= (digit - 'a' + 10); break;
case 'A': case 'B': case 'C': case 'D': case 'E':
case 'F':
c2 |= (digit - 'A' + 10); break;
default:
raise_errmsg("Invalid \\uXXXX escape", pystr, end - 5);
goto bail;
}
}
if ((c2 & 0xfc00) == 0xdc00)
c = 0x10000 + (((c - 0xd800) << 10) | (c2 - 0xdc00));
else
end -= 6;
}
#endif
}
chunk = PyUnicode_FromUnicode(&c, 1);
if (chunk == NULL) {
goto bail;
}
if (PyList_Append(chunks, chunk)) {
Py_DECREF(chunk);
goto bail;
}
Py_DECREF(chunk);
}
rval = join_list_unicode(chunks);
if (rval == NULL) {
goto bail;
}
Py_DECREF(chunks);
*next_end_ptr = end;
return rval;
bail:
*next_end_ptr = -1;
Py_XDECREF(chunks);
return NULL;
}
PyDoc_STRVAR(pydoc_scanstring,
"scanstring(basestring, end, encoding, strict=True) -> (str, end)\n"
"\n"
"Scan the string s for a JSON string. End is the index of the\n"
"character in s after the quote that started the JSON string.\n"
"Unescapes all valid JSON string escape sequences and raises ValueError\n"
"on attempt to decode an invalid string. If strict is False then literal\n"
"control characters are allowed in the string.\n"
"\n"
"Returns a tuple of the decoded string and the index of the character in s\n"
"after the end quote."
);
static PyObject *
py_scanstring(PyObject* self UNUSED, PyObject *args)
{
PyObject *pystr;
PyObject *rval;
Py_ssize_t end;
Py_ssize_t next_end = -1;
char *encoding = NULL;
int strict = 1;
if (!PyArg_ParseTuple(args, "OO&|zi:scanstring", &pystr, _convertPyInt_AsSsize_t, &end, &encoding, &strict)) {
return NULL;
}
if (encoding == NULL) {
encoding = DEFAULT_ENCODING;
}
if (PyString_Check(pystr)) {
rval = scanstring_str(pystr, end, encoding, strict, &next_end);
}
else if (PyUnicode_Check(pystr)) {
rval = scanstring_unicode(pystr, end, strict, &next_end);
}
else {
PyErr_Format(PyExc_TypeError,
"first argument must be a string, not %.80s",
Py_TYPE(pystr)->tp_name);
return NULL;
}
return _build_rval_index_tuple(rval, next_end);
}
PyDoc_STRVAR(pydoc_encode_basestring_ascii,
"encode_basestring_ascii(basestring) -> str\n"
"\n"
"Return an ASCII-only JSON representation of a Python string"
);
static PyObject *
py_encode_basestring_ascii(PyObject* self UNUSED, PyObject *pystr)
{
/* Return an ASCII-only JSON representation of a Python string */
/* METH_O */
if (PyString_Check(pystr)) {
return ascii_escape_str(pystr);
}
else if (PyUnicode_Check(pystr)) {
return ascii_escape_unicode(pystr);
}
else {
PyErr_Format(PyExc_TypeError,
"first argument must be a string, not %.80s",
Py_TYPE(pystr)->tp_name);
return NULL;
}
}
static void
scanner_dealloc(PyObject *self)
{
/* bpo-31095: UnTrack is needed before calling any callbacks */
PyObject_GC_UnTrack(self);
scanner_clear(self);
Py_TYPE(self)->tp_free(self);
}
static int
scanner_traverse(PyObject *self, visitproc visit, void *arg)
{
PyScannerObject *s;
assert(PyScanner_Check(self));
s = (PyScannerObject *)self;
Py_VISIT(s->encoding);
Py_VISIT(s->strict);
Py_VISIT(s->object_hook);
Py_VISIT(s->pairs_hook);
Py_VISIT(s->parse_float);
Py_VISIT(s->parse_int);
Py_VISIT(s->parse_constant);
return 0;
}
static int
scanner_clear(PyObject *self)
{
PyScannerObject *s;
assert(PyScanner_Check(self));
s = (PyScannerObject *)self;
Py_CLEAR(s->encoding);
Py_CLEAR(s->strict);
Py_CLEAR(s->object_hook);
Py_CLEAR(s->pairs_hook);
Py_CLEAR(s->parse_float);
Py_CLEAR(s->parse_int);
Py_CLEAR(s->parse_constant);
return 0;
}
static PyObject *
_parse_object_str(PyScannerObject *s, PyObject *pystr, Py_ssize_t idx, Py_ssize_t *next_idx_ptr) {
/* Read a JSON object from PyString pystr.
idx is the index of the first character after the opening curly brace.
*next_idx_ptr is a return-by-reference index to the first character after
the closing curly brace.
Returns a new PyObject (usually a dict, but object_hook can change that)
*/
char *str = PyString_AS_STRING(pystr);
Py_ssize_t end_idx = PyString_GET_SIZE(pystr) - 1;
PyObject *rval;
PyObject *pairs;
PyObject *item;
PyObject *key = NULL;
PyObject *val = NULL;
char *encoding = PyString_AS_STRING(s->encoding);
int strict = PyObject_IsTrue(s->strict);
Py_ssize_t next_idx;
if (strict < 0)
return NULL;
pairs = PyList_New(0);
if (pairs == NULL)
return NULL;
/* skip whitespace after { */
while (idx <= end_idx && IS_WHITESPACE(str[idx])) idx++;
/* only loop if the object is non-empty */
if (idx <= end_idx && str[idx] != '}') {
while (idx <= end_idx) {
/* read key */
if (str[idx] != '"') {
raise_errmsg("Expecting property name", pystr, idx);
goto bail;
}
key = scanstring_str(pystr, idx + 1, encoding, strict, &next_idx);
if (key == NULL)
goto bail;
idx = next_idx;
/* skip whitespace between key and : delimiter, read :, skip whitespace */
while (idx <= end_idx && IS_WHITESPACE(str[idx])) idx++;
if (idx > end_idx || str[idx] != ':') {
raise_errmsg("Expecting : delimiter", pystr, idx);
goto bail;
}
idx++;
while (idx <= end_idx && IS_WHITESPACE(str[idx])) idx++;
/* read any JSON data type */
val = scan_once_str(s, pystr, idx, &next_idx);
if (val == NULL)
goto bail;
item = PyTuple_Pack(2, key, val);
if (item == NULL)
goto bail;
Py_CLEAR(key);
Py_CLEAR(val);
if (PyList_Append(pairs, item) == -1) {
Py_DECREF(item);
goto bail;
}
Py_DECREF(item);
idx = next_idx;
/* skip whitespace before } or , */
while (idx <= end_idx && IS_WHITESPACE(str[idx])) idx++;
/* bail if the object is closed or we didn't get the , delimiter */
if (idx > end_idx) break;
if (str[idx] == '}') {
break;
}
else if (str[idx] != ',') {
raise_errmsg("Expecting , delimiter", pystr, idx);
goto bail;
}
idx++;
/* skip whitespace after , delimiter */
while (idx <= end_idx && IS_WHITESPACE(str[idx])) idx++;
}
}
/* verify that idx < end_idx, str[idx] should be '}' */
if (idx > end_idx || str[idx] != '}') {
raise_errmsg("Expecting object", pystr, end_idx);
goto bail;
}
/* if pairs_hook is not None: rval = object_pairs_hook(pairs) */
if (s->pairs_hook != Py_None) {
val = PyObject_CallFunctionObjArgs(s->pairs_hook, pairs, NULL);
if (val == NULL)
goto bail;
Py_DECREF(pairs);
*next_idx_ptr = idx + 1;
return val;
}
rval = PyObject_CallFunctionObjArgs((PyObject *)(&PyDict_Type),
pairs, NULL);
if (rval == NULL)
goto bail;
Py_CLEAR(pairs);
/* if object_hook is not None: rval = object_hook(rval) */
if (s->object_hook != Py_None) {
val = PyObject_CallFunctionObjArgs(s->object_hook, rval, NULL);
if (val == NULL)
goto bail;
Py_DECREF(rval);
rval = val;
val = NULL;
}
*next_idx_ptr = idx + 1;
return rval;