Skip to content
Navigation Menu
{{ message }}
forked from adafruit/circuitpython
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathmodjson.c
More file actions
466 lines (427 loc) · 15.8 KB
/
Copy pathmodjson.c
File metadata and controls
466 lines (427 loc) · 15.8 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
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2014-2019 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdio.h>
// CIRCUITPY-CHANGE
#include "py/binary.h"
#include "py/objarray.h"
#include "py/objlist.h"
#include "py/objstringio.h"
#include "py/parsenum.h"
#include "py/runtime.h"
#include "py/stream.h"
#if MICROPY_PY_JSON
#if MICROPY_PY_JSON_SEPARATORS
enum {
DUMP_MODE_TO_STRING = 1,
DUMP_MODE_TO_STREAM = 2,
};
static mp_obj_t mod_json_dump_helper(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args, unsigned int mode) {
enum { ARG_separators };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_separators, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
};
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args - mode, pos_args + mode, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
mp_print_ext_t print_ext;
if (args[ARG_separators].u_obj == mp_const_none) {
print_ext.item_separator = ", ";
print_ext.key_separator = ": ";
} else {
mp_obj_t *items;
mp_obj_get_array_fixed_n(args[ARG_separators].u_obj, 2, &items);
print_ext.item_separator = mp_obj_str_get_str(items[0]);
print_ext.key_separator = mp_obj_str_get_str(items[1]);
}
if (mode == DUMP_MODE_TO_STRING) {
// dumps(obj)
vstr_t vstr;
vstr_init_print(&vstr, 8, &print_ext.base);
mp_obj_print_helper(&print_ext.base, pos_args[0], PRINT_JSON);
return mp_obj_new_str_from_utf8_vstr(&vstr);
} else {
// dump(obj, stream)
print_ext.base.data = MP_OBJ_TO_PTR(pos_args[1]);
print_ext.base.print_strn = mp_stream_write_adaptor;
mp_get_stream_raise(pos_args[1], MP_STREAM_OP_WRITE);
mp_obj_print_helper(&print_ext.base, pos_args[0], PRINT_JSON);
return mp_const_none;
}
}
static mp_obj_t mod_json_dump(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
return mod_json_dump_helper(n_args, pos_args, kw_args, DUMP_MODE_TO_STREAM);
}
static MP_DEFINE_CONST_FUN_OBJ_KW(mod_json_dump_obj, 2, mod_json_dump);
static mp_obj_t mod_json_dumps(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
return mod_json_dump_helper(n_args, pos_args, kw_args, DUMP_MODE_TO_STRING);
}
static MP_DEFINE_CONST_FUN_OBJ_KW(mod_json_dumps_obj, 1, mod_json_dumps);
#else
static mp_obj_t mod_json_dump(mp_obj_t obj, mp_obj_t stream) {
mp_get_stream_raise(stream, MP_STREAM_OP_WRITE);
mp_print_t print = {MP_OBJ_TO_PTR(stream), mp_stream_write_adaptor};
mp_obj_print_helper(&print, obj, PRINT_JSON);
return mp_const_none;
}
static MP_DEFINE_CONST_FUN_OBJ_2(mod_json_dump_obj, mod_json_dump);
static mp_obj_t mod_json_dumps(mp_obj_t obj) {
vstr_t vstr;
mp_print_t print;
vstr_init_print(&vstr, 8, &print);
mp_obj_print_helper(&print, obj, PRINT_JSON);
return mp_obj_new_str_from_utf8_vstr(&vstr);
}
static MP_DEFINE_CONST_FUN_OBJ_1(mod_json_dumps_obj, mod_json_dumps);
#endif
// CIRCUITPY-CHANGE
#define JSON_DEBUG(...) (void)0
// #define JSON_DEBUG(...) mp_printf(&mp_plat_print __VA_OPT__(,) __VA_ARGS__)
// The function below implements a simple non-recursive JSON parser.
//
// The JSON specification is at http://www.ietf.org/rfc/rfc4627.txt
// The parser here will parse any valid JSON and return the correct
// corresponding Python object. It allows through a superset of JSON, since
// it treats commas and colons as "whitespace", and doesn't care if
// brackets/braces are correctly paired. It will raise a ValueError if the
// input is outside it's specs.
//
// Most of the work is parsing the primitives (null, false, true, numbers,
// strings). It does 1 pass over the input stream. It tries to be fast and
// small in code size, while not using more RAM than necessary.
typedef struct _json_stream_t {
mp_obj_t stream_obj;
mp_uint_t (*read)(mp_obj_t obj, void *buf, mp_uint_t size, int *errcode);
int errcode;
// CIRCUITPY-CHANGE
mp_obj_t python_readinto[2 + 1];
mp_obj_array_t bytearray_obj;
size_t start;
size_t end;
byte cur;
} json_stream_t;
#define S_EOF (0) // null is not allowed in json stream so is ok as EOF marker
#define S_END(s) ((s).cur == S_EOF)
#define S_CUR(s) ((s).cur)
#define S_NEXT(s) (json_stream_next(&(s)))
static byte json_stream_next(json_stream_t *s) {
mp_uint_t ret = s->read(s->stream_obj, &s->cur, 1, &s->errcode);
// CIRCUITPY-CHANGE
JSON_DEBUG(" usjon_stream_next err:%2d cur: %c \n", s->errcode, s->cur);
if (s->errcode != 0) {
mp_raise_OSError(s->errcode);
}
if (ret == 0) {
s->cur = S_EOF;
}
return s->cur;
}
// CIRCUITPY-CHANGE
// We read from an object's `readinto` method in chunks larger than the json
// parser needs to reduce the number of function calls done.
#define CIRCUITPY_JSON_READ_CHUNK_SIZE 64
static mp_uint_t json_python_readinto(mp_obj_t obj, void *buf, mp_uint_t size, int *errcode) {
(void)size; // Ignore size because we know it's always 1.
json_stream_t *s = obj;
if (s->start == s->end) {
*errcode = 0;
mp_obj_t ret = mp_call_method_n_kw(1, 0, s->python_readinto);
if (ret == mp_const_none) {
*errcode = MP_EAGAIN;
return MP_STREAM_ERROR;
}
s->start = 0;
s->end = mp_obj_get_int(ret);
if (s->end == 0) {
return 0;
}
}
*((uint8_t *)buf) = ((uint8_t *)s->bytearray_obj.items)[s->start];
s->start++;
return 1;
}
static mp_obj_t _mod_json_load(mp_obj_t stream_obj, bool return_first_json) {
const mp_stream_p_t *stream_p = mp_proto_get(0, stream_obj);
json_stream_t s;
uint8_t character_buffer[CIRCUITPY_JSON_READ_CHUNK_SIZE];
if (stream_p == NULL) {
s.start = 0;
s.end = 0;
mp_load_method(stream_obj, MP_QSTR_readinto, s.python_readinto);
s.bytearray_obj.base.type = &mp_type_bytearray;
s.bytearray_obj.typecode = BYTEARRAY_TYPECODE;
s.bytearray_obj.len = CIRCUITPY_JSON_READ_CHUNK_SIZE;
s.bytearray_obj.free = 0;
s.bytearray_obj.items = character_buffer;
s.python_readinto[2] = MP_OBJ_FROM_PTR(&s.bytearray_obj);
s.stream_obj = &s;
s.read = json_python_readinto;
} else {
stream_p = mp_get_stream_raise(stream_obj, MP_STREAM_OP_READ);
s.stream_obj = stream_obj;
s.read = stream_p->read;
s.errcode = 0;
s.cur = 0;
}
JSON_DEBUG("got JSON stream\n");
vstr_t vstr;
vstr_init(&vstr, 8);
mp_obj_list_t stack; // we use a list as a simple stack for nested JSON
stack.len = 0;
stack.items = NULL;
mp_obj_t stack_top = MP_OBJ_NULL;
const mp_obj_type_t *stack_top_type = NULL;
mp_obj_t stack_key = MP_OBJ_NULL;
S_NEXT(s);
for (;;) {
cont:
if (S_END(s)) {
break;
}
mp_obj_t next = MP_OBJ_NULL;
bool enter = false;
byte cur = S_CUR(s);
S_NEXT(s);
switch (cur) {
case ',':
case ':':
case ' ':
case '\t':
case '\n':
case '\r':
goto cont;
case 'n':
if (S_CUR(s) == 'u' && S_NEXT(s) == 'l' && S_NEXT(s) == 'l') {
S_NEXT(s);
next = mp_const_none;
} else {
goto fail;
}
break;
case 'f':
if (S_CUR(s) == 'a' && S_NEXT(s) == 'l' && S_NEXT(s) == 's' && S_NEXT(s) == 'e') {
S_NEXT(s);
next = mp_const_false;
} else {
goto fail;
}
break;
case 't':
if (S_CUR(s) == 'r' && S_NEXT(s) == 'u' && S_NEXT(s) == 'e') {
S_NEXT(s);
next = mp_const_true;
} else {
goto fail;
}
break;
case '"':
vstr_reset(&vstr);
for (; !S_END(s) && S_CUR(s) != '"';) {
byte c = S_CUR(s);
if (c == '\\') {
c = S_NEXT(s);
switch (c) {
case 'b':
c = 0x08;
break;
case 'f':
c = 0x0c;
break;
case 'n':
c = 0x0a;
break;
case 'r':
c = 0x0d;
break;
case 't':
c = 0x09;
break;
case 'u': {
mp_uint_t num = 0;
for (int i = 0; i < 4; i++) {
c = (S_NEXT(s) | 0x20) - '0';
if (c > 9) {
c -= ('a' - ('9' + 1));
}
num = (num << 4) | c;
}
vstr_add_char(&vstr, num);
goto str_cont;
}
}
}
vstr_add_byte(&vstr, c);
str_cont:
S_NEXT(s);
}
if (S_END(s)) {
goto fail;
}
S_NEXT(s);
next = mp_obj_new_str(vstr.buf, vstr.len);
break;
case '-':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9': {
bool flt = false;
vstr_reset(&vstr);
for (;;) {
vstr_add_byte(&vstr, cur);
cur = S_CUR(s);
if (cur == '.' || cur == 'E' || cur == 'e') {
flt = true;
} else if (cur == '+' || cur == '-' || unichar_isdigit(cur)) {
// pass
} else {
break;
}
S_NEXT(s);
}
if (flt) {
next = mp_parse_num_float(vstr.buf, vstr.len, false, NULL);
} else {
next = mp_parse_num_integer(vstr.buf, vstr.len, 10, NULL);
}
break;
}
case '[':
next = mp_obj_new_list(0, NULL);
enter = true;
break;
case '{':
next = mp_obj_new_dict(0);
enter = true;
break;
case '}':
case ']': {
if (stack_top == MP_OBJ_NULL) {
// no object at all
goto fail;
}
if (stack.len == 0) {
// finished; compound object
goto success;
}
stack.len -= 1;
stack_top = stack.items[stack.len];
stack_top_type = mp_obj_get_type(stack_top);
goto cont;
}
default:
goto fail;
}
if (stack_top == MP_OBJ_NULL) {
stack_top = next;
stack_top_type = mp_obj_get_type(stack_top);
if (!enter) {
// finished; single primitive only
goto success;
}
} else {
// append to list or dict
if (stack_top_type == &mp_type_list) {
mp_obj_list_append(stack_top, next);
} else {
if (stack_key == MP_OBJ_NULL) {
stack_key = next;
if (enter) {
goto fail;
}
} else {
mp_obj_dict_store(stack_top, stack_key, next);
stack_key = MP_OBJ_NULL;
}
}
if (enter) {
if (stack.items == NULL) {
mp_obj_list_init(&stack, 1);
stack.items[0] = stack_top;
} else {
mp_obj_list_append(MP_OBJ_FROM_PTR(&stack), stack_top);
}
stack_top = next;
stack_top_type = mp_obj_get_type(stack_top);
}
}
}
success:
// CIRCUITPY-CHANGE
// It is legal for a stream to have contents after JSON.
// E.g., A UART is not closed after receiving an object; in load() we will
// return the first complete JSON object, while in loads() we will retain
// strict adherence to the buffer's complete semantic.
if (!return_first_json) {
while (unichar_isspace(S_CUR(s))) {
S_NEXT(s);
}
if (!S_END(s)) {
// unexpected chars
goto fail;
}
}
if (stack_top == MP_OBJ_NULL || stack.len != 0) {
// not exactly 1 object
goto fail;
}
vstr_clear(&vstr);
return stack_top;
fail:
mp_raise_ValueError(MP_ERROR_TEXT("syntax error in JSON"));
}
// CIRCUITPY-CHANGE
static mp_obj_t mod_json_load(mp_obj_t stream_obj) {
return _mod_json_load(stream_obj, true);
}
static MP_DEFINE_CONST_FUN_OBJ_1(mod_json_load_obj, mod_json_load);
static mp_obj_t mod_json_loads(mp_obj_t obj) {
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(obj, &bufinfo, MP_BUFFER_READ);
vstr_t vstr = {bufinfo.len, bufinfo.len, (char *)bufinfo.buf, true};
mp_obj_stringio_t sio = {{&mp_type_stringio}, &vstr, 0, MP_OBJ_NULL};
// CIRCUITPY-CHANGE
return _mod_json_load(MP_OBJ_FROM_PTR(&sio), false);
}
static MP_DEFINE_CONST_FUN_OBJ_1(mod_json_loads_obj, mod_json_loads);
static const mp_rom_map_elem_t mp_module_json_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_json) },
{ MP_ROM_QSTR(MP_QSTR_dump), MP_ROM_PTR(&mod_json_dump_obj) },
{ MP_ROM_QSTR(MP_QSTR_dumps), MP_ROM_PTR(&mod_json_dumps_obj) },
{ MP_ROM_QSTR(MP_QSTR_load), MP_ROM_PTR(&mod_json_load_obj) },
{ MP_ROM_QSTR(MP_QSTR_loads), MP_ROM_PTR(&mod_json_loads_obj) },
};
static MP_DEFINE_CONST_DICT(mp_module_json_globals, mp_module_json_globals_table);
const mp_obj_module_t mp_module_json = {
.base = { &mp_type_module },
.globals = (mp_obj_dict_t *)&mp_module_json_globals,
};
MP_REGISTER_EXTENSIBLE_MODULE(MP_QSTR_json, mp_module_json);
#endif // MICROPY_PY_JSON
You can’t perform that action at this time.