cbb23cdb |
1 | /* |
2 | Parson ( http://kgabis.github.com/parson/ ) |
3 | Copyright (c) 2012 Krzysztof Gabis |
4 | |
5 | Permission is hereby granted, free of charge, to any person obtaining a copy |
6 | of this software and associated documentation files (the "Software"), to deal |
7 | in the Software without restriction, including without limitation the rights |
8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
9 | copies of the Software, and to permit persons to whom the Software is |
10 | furnished to do so, subject to the following conditions: |
11 | |
12 | The above copyright notice and this permission notice shall be included in |
13 | all copies or substantial portions of the Software. |
14 | |
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
21 | THE SOFTWARE. |
22 | */ |
23 | |
24 | #include "parson.h" |
25 | |
26 | #include <stdio.h> |
27 | #include <stdlib.h> |
28 | #include <string.h> |
29 | #include <ctype.h> |
30 | |
31 | #define ERROR 0 |
32 | #define SUCCESS 1 |
33 | #define STARTING_CAPACITY 15 |
34 | #define ARRAY_MAX_CAPACITY 122880 /* 15*(2^13) */ |
35 | #define OBJECT_MAX_CAPACITY 960 /* 15*(2^6) */ |
36 | #define MAX_NESTING 19 |
37 | #define sizeof_token(a) (sizeof(a) - 1) |
38 | #define skip_char(str) ((*str)++) |
39 | #define skip_whitespaces(str) while (isspace(**string)) { skip_char(string); } |
40 | #define MAX(a, b) ((a) > (b) ? (a) : (b)) |
41 | |
42 | #define parson_malloc(a) malloc(a) |
43 | #define parson_free(a) free((void*)a) |
44 | #define parson_realloc(a, b) realloc(a, b) |
45 | |
46 | /* Type definitions */ |
47 | typedef union json_value_value { |
48 | const char *string; |
49 | double number; |
50 | JSON_Object *object; |
51 | JSON_Array *array; |
52 | int boolean; |
53 | int null; |
54 | } JSON_Value_Value; |
55 | |
56 | struct json_value_t { |
57 | JSON_Value_Type type; |
58 | JSON_Value_Value value; |
59 | }; |
60 | |
61 | struct json_object_t { |
62 | const char **names; |
63 | JSON_Value **values; |
64 | size_t count; |
65 | size_t capacity; |
66 | }; |
67 | |
68 | struct json_array_t { |
69 | JSON_Value **items; |
70 | size_t count; |
71 | size_t capacity; |
72 | }; |
73 | |
74 | /* Various */ |
75 | static int try_realloc(void **ptr, size_t new_size); |
76 | static char * parson_strndup(const char *string, size_t n); |
77 | static int is_utf(const unsigned char *string); |
78 | static int is_decimal(const char *string, size_t length); |
79 | |
80 | /* JSON Object */ |
81 | static JSON_Object * json_object_init(void); |
82 | static int json_object_add(JSON_Object *object, const char *name, JSON_Value *value); |
83 | static int json_object_resize(JSON_Object *object, size_t capacity); |
84 | static JSON_Value * json_object_nget_value(const JSON_Object *object, const char *name, size_t n); |
85 | static void json_object_free(JSON_Object *object); |
86 | |
87 | /* JSON Array */ |
88 | static JSON_Array * json_array_init(void); |
89 | static int json_array_add(JSON_Array *array, JSON_Value *value); |
90 | static int json_array_resize(JSON_Array *array, size_t capacity); |
91 | static void json_array_free(JSON_Array *array); |
92 | |
93 | /* JSON Value */ |
94 | static JSON_Value * json_value_init_object(void); |
95 | static JSON_Value * json_value_init_array(void); |
96 | static JSON_Value * json_value_init_string(const char *string); |
97 | static JSON_Value * json_value_init_number(double number); |
98 | static JSON_Value * json_value_init_boolean(int boolean); |
99 | static JSON_Value * json_value_init_null(void); |
100 | |
101 | /* Parser */ |
102 | static void skip_quotes(const char **string); |
103 | static const char * get_processed_string(const char **string); |
104 | static JSON_Value * parse_object_value(const char **string, size_t nesting); |
105 | static JSON_Value * parse_array_value(const char **string, size_t nesting); |
106 | static JSON_Value * parse_string_value(const char **string); |
107 | static JSON_Value * parse_boolean_value(const char **string); |
108 | static JSON_Value * parse_number_value(const char **string); |
109 | static JSON_Value * parse_null_value(const char **string); |
110 | static JSON_Value * parse_value(const char **string, size_t nesting); |
111 | |
112 | /* Various */ |
113 | static int try_realloc(void **ptr, size_t new_size) { |
114 | void *reallocated_ptr = parson_realloc(*ptr, new_size); |
115 | if (!reallocated_ptr) { return ERROR; } |
116 | *ptr = reallocated_ptr; |
117 | return SUCCESS; |
118 | } |
119 | |
120 | static char * parson_strndup(const char *string, size_t n) { |
121 | char *output_string = (char*)parson_malloc(n + 1); |
122 | if (!output_string) { return NULL; } |
123 | output_string[n] = '\0'; |
124 | strncpy(output_string, string, n); |
125 | return output_string; |
126 | } |
127 | |
128 | static int is_utf(const unsigned char *s) { |
129 | return isxdigit(s[0]) && isxdigit(s[1]) && isxdigit(s[2]) && isxdigit(s[3]); |
130 | } |
131 | |
132 | static int is_decimal(const char *string, size_t length) { |
133 | if (length > 1 && string[0] == '0' && string[1] != '.') { return 0; } |
134 | if (length > 2 && !strncmp(string, "-0", 2) && string[2] != '.') { return 0; } |
135 | while (length--) { if (strchr("xX", string[length])) { return 0; } } |
136 | return 1; |
137 | } |
138 | |
139 | /* JSON Object */ |
140 | static JSON_Object * json_object_init(void) { |
141 | JSON_Object *new_obj = (JSON_Object*)parson_malloc(sizeof(JSON_Object)); |
142 | if (!new_obj) { return NULL; } |
143 | new_obj->names = (const char**)NULL; |
144 | new_obj->values = (JSON_Value**)NULL; |
145 | new_obj->capacity = 0; |
146 | new_obj->count = 0; |
147 | return new_obj; |
148 | } |
149 | |
150 | static int json_object_add(JSON_Object *object, const char *name, JSON_Value *value) { |
151 | size_t index; |
152 | if (object->count >= object->capacity) { |
153 | size_t new_capacity = MAX(object->capacity * 2, STARTING_CAPACITY); |
154 | if (new_capacity > OBJECT_MAX_CAPACITY) { return ERROR; } |
155 | if (json_object_resize(object, new_capacity) == ERROR) { return ERROR; } |
156 | } |
157 | if (json_object_get_value(object, name) != NULL) { return ERROR; } |
158 | index = object->count; |
159 | object->names[index] = parson_strndup(name, strlen(name)); |
160 | if (!object->names[index]) { return ERROR; } |
161 | object->values[index] = value; |
162 | object->count++; |
163 | return SUCCESS; |
164 | } |
165 | |
166 | static int json_object_resize(JSON_Object *object, size_t capacity) { |
167 | if (try_realloc((void**)&object->names, capacity * sizeof(char*)) == ERROR) { return ERROR; } |
168 | if (try_realloc((void**)&object->values, capacity * sizeof(JSON_Value*)) == ERROR) { return ERROR; } |
169 | object->capacity = capacity; |
170 | return SUCCESS; |
171 | } |
172 | |
173 | static JSON_Value * json_object_nget_value(const JSON_Object *object, const char *name, size_t n) { |
174 | size_t i, name_length; |
175 | for (i = 0; i < json_object_get_count(object); i++) { |
176 | name_length = strlen(object->names[i]); |
177 | if (name_length != n) { continue; } |
178 | if (strncmp(object->names[i], name, n) == 0) { return object->values[i]; } |
179 | } |
180 | return NULL; |
181 | } |
182 | |
183 | static void json_object_free(JSON_Object *object) { |
184 | while(object->count--) { |
185 | parson_free(object->names[object->count]); |
186 | json_value_free(object->values[object->count]); |
187 | } |
188 | parson_free(object->names); |
189 | parson_free(object->values); |
190 | parson_free(object); |
191 | } |
192 | |
193 | /* JSON Array */ |
194 | static JSON_Array * json_array_init(void) { |
195 | JSON_Array *new_array = (JSON_Array*)parson_malloc(sizeof(JSON_Array)); |
196 | if (!new_array) { return NULL; } |
197 | new_array->items = (JSON_Value**)NULL; |
198 | new_array->capacity = 0; |
199 | new_array->count = 0; |
200 | return new_array; |
201 | } |
202 | |
203 | static int json_array_add(JSON_Array *array, JSON_Value *value) { |
204 | if (array->count >= array->capacity) { |
205 | size_t new_capacity = MAX(array->capacity * 2, STARTING_CAPACITY); |
206 | if (new_capacity > ARRAY_MAX_CAPACITY) { return ERROR; } |
207 | if (!json_array_resize(array, new_capacity)) { return ERROR; } |
208 | } |
209 | array->items[array->count] = value; |
210 | array->count++; |
211 | return SUCCESS; |
212 | } |
213 | |
214 | static int json_array_resize(JSON_Array *array, size_t capacity) { |
215 | if (try_realloc((void**)&array->items, capacity * sizeof(JSON_Value*)) == ERROR) { return ERROR; } |
216 | array->capacity = capacity; |
217 | return SUCCESS; |
218 | } |
219 | |
220 | static void json_array_free(JSON_Array *array) { |
221 | while (array->count--) { json_value_free(array->items[array->count]); } |
222 | parson_free(array->items); |
223 | parson_free(array); |
224 | } |
225 | |
226 | /* JSON Value */ |
227 | static JSON_Value * json_value_init_object(void) { |
228 | JSON_Value *new_value = (JSON_Value*)parson_malloc(sizeof(JSON_Value)); |
229 | if (!new_value) { return NULL; } |
230 | new_value->type = JSONObject; |
231 | new_value->value.object = json_object_init(); |
232 | if (!new_value->value.object) { parson_free(new_value); return NULL; } |
233 | return new_value; |
234 | } |
235 | |
236 | static JSON_Value * json_value_init_array(void) { |
237 | JSON_Value *new_value = (JSON_Value*)parson_malloc(sizeof(JSON_Value)); |
238 | if (!new_value) { return NULL; } |
239 | new_value->type = JSONArray; |
240 | new_value->value.array = json_array_init(); |
241 | if (!new_value->value.array) { parson_free(new_value); return NULL; } |
242 | return new_value; |
243 | } |
244 | |
245 | static JSON_Value * json_value_init_string(const char *string) { |
246 | JSON_Value *new_value = (JSON_Value*)parson_malloc(sizeof(JSON_Value)); |
247 | if (!new_value) { return NULL; } |
248 | new_value->type = JSONString; |
249 | new_value->value.string = string; |
250 | return new_value; |
251 | } |
252 | |
253 | static JSON_Value * json_value_init_number(double number) { |
254 | JSON_Value *new_value = (JSON_Value*)parson_malloc(sizeof(JSON_Value)); |
255 | if (!new_value) { return NULL; } |
256 | new_value->type = JSONNumber; |
257 | new_value->value.number = number; |
258 | return new_value; |
259 | } |
260 | |
261 | static JSON_Value * json_value_init_boolean(int boolean) { |
262 | JSON_Value *new_value = (JSON_Value*)parson_malloc(sizeof(JSON_Value)); |
263 | if (!new_value) { return NULL; } |
264 | new_value->type = JSONBoolean; |
265 | new_value->value.boolean = boolean; |
266 | return new_value; |
267 | } |
268 | |
269 | static JSON_Value * json_value_init_null(void) { |
270 | JSON_Value *new_value = (JSON_Value*)parson_malloc(sizeof(JSON_Value)); |
271 | if (!new_value) { return NULL; } |
272 | new_value->type = JSONNull; |
273 | return new_value; |
274 | } |
275 | |
276 | /* Parser */ |
277 | static void skip_quotes(const char **string) { |
278 | skip_char(string); |
279 | while (**string != '\"') { |
280 | if (**string == '\0') { return; } |
281 | if (**string == '\\') { skip_char(string); if (**string == '\0') { return; }} |
282 | skip_char(string); |
283 | } |
284 | skip_char(string); |
285 | } |
286 | |
287 | /* Returns contents of a string inside double quotes and parses escaped |
288 | characters inside. |
289 | Example: "\u006Corem ipsum" -> lorem ipsum */ |
290 | static const char * get_processed_string(const char **string) { |
291 | const char *string_start = *string; |
292 | char *output, *processed_ptr, *unprocessed_ptr, current_char; |
293 | unsigned int utf_val; |
294 | skip_quotes(string); |
295 | if (**string == '\0') { return NULL; } |
296 | output = parson_strndup(string_start + 1, *string - string_start - 2); |
297 | if (!output) { return NULL; } |
298 | processed_ptr = unprocessed_ptr = output; |
299 | while (*unprocessed_ptr) { |
300 | current_char = *unprocessed_ptr; |
301 | if (current_char == '\\') { |
302 | unprocessed_ptr++; |
303 | current_char = *unprocessed_ptr; |
304 | switch (current_char) { |
305 | case '\"': case '\\': case '/': break; |
306 | case 'b': current_char = '\b'; break; |
307 | case 'f': current_char = '\f'; break; |
308 | case 'n': current_char = '\n'; break; |
309 | case 'r': current_char = '\r'; break; |
310 | case 't': current_char = '\t'; break; |
311 | case 'u': |
312 | unprocessed_ptr++; |
313 | if (!is_utf((const unsigned char*)unprocessed_ptr) || |
314 | sscanf(unprocessed_ptr, "%4x", &utf_val) == EOF) { |
315 | parson_free(output); return NULL; |
316 | } |
317 | if (utf_val < 0x80) { |
318 | current_char = utf_val; |
319 | } else if (utf_val < 0x800) { |
320 | *processed_ptr++ = (utf_val >> 6) | 0xC0; |
321 | current_char = ((utf_val | 0x80) & 0xBF); |
322 | } else { |
323 | *processed_ptr++ = (utf_val >> 12) | 0xE0; |
324 | *processed_ptr++ = (((utf_val >> 6) | 0x80) & 0xBF); |
325 | current_char = ((utf_val | 0x80) & 0xBF); |
326 | } |
327 | unprocessed_ptr += 3; |
328 | break; |
329 | default: |
330 | parson_free(output); |
331 | return NULL; |
332 | break; |
333 | } |
334 | } else if ((unsigned char)current_char < 0x20) { /* 0x00-0x19 are invalid characters for json string (http://www.ietf.org/rfc/rfc4627.txt) */ |
335 | parson_free(output); |
336 | return NULL; |
337 | } |
338 | *processed_ptr = current_char; |
339 | processed_ptr++; |
340 | unprocessed_ptr++; |
341 | } |
342 | *processed_ptr = '\0'; |
343 | if (try_realloc((void**)&output, strlen(output) + 1) == ERROR) { return NULL; } |
344 | return output; |
345 | } |
346 | |
347 | static JSON_Value * parse_value(const char **string, size_t nesting) { |
348 | if (nesting > MAX_NESTING) { return NULL; } |
349 | skip_whitespaces(string); |
350 | switch (**string) { |
351 | case '{': |
352 | return parse_object_value(string, nesting + 1); |
353 | case '[': |
354 | return parse_array_value(string, nesting + 1); |
355 | case '\"': |
356 | return parse_string_value(string); |
357 | case 'f': case 't': |
358 | return parse_boolean_value(string); |
359 | case '-': |
360 | case '0': case '1': case '2': case '3': case '4': |
361 | case '5': case '6': case '7': case '8': case '9': |
362 | return parse_number_value(string); |
363 | case 'n': |
364 | return parse_null_value(string); |
365 | default: |
366 | return NULL; |
367 | } |
368 | } |
369 | |
370 | static JSON_Value * parse_object_value(const char **string, size_t nesting) { |
371 | JSON_Value *output_value = json_value_init_object(), *new_value = NULL; |
372 | JSON_Object *output_object = json_value_get_object(output_value); |
373 | const char *new_key = NULL; |
374 | if (!output_value) { return NULL; } |
375 | skip_char(string); |
376 | skip_whitespaces(string); |
377 | if (**string == '}') { skip_char(string); return output_value; } /* empty object */ |
378 | while (**string != '\0') { |
379 | new_key = get_processed_string(string); |
380 | skip_whitespaces(string); |
381 | if (!new_key || **string != ':') { |
382 | json_value_free(output_value); |
383 | return NULL; |
384 | } |
385 | skip_char(string); |
386 | new_value = parse_value(string, nesting); |
387 | if (!new_value) { |
388 | parson_free(new_key); |
389 | json_value_free(output_value); |
390 | return NULL; |
391 | } |
392 | if(!json_object_add(output_object, new_key, new_value)) { |
393 | parson_free(new_key); |
394 | parson_free(new_value); |
395 | json_value_free(output_value); |
396 | return NULL; |
397 | } |
398 | parson_free(new_key); |
399 | skip_whitespaces(string); |
400 | if (**string != ',') { break; } |
401 | skip_char(string); |
402 | skip_whitespaces(string); |
403 | } |
404 | skip_whitespaces(string); |
405 | if (**string != '}' || /* Trim object after parsing is over */ |
406 | json_object_resize(output_object, json_object_get_count(output_object)) == ERROR) { |
407 | json_value_free(output_value); |
408 | return NULL; |
409 | } |
410 | skip_char(string); |
411 | return output_value; |
412 | } |
413 | |
414 | static JSON_Value * parse_array_value(const char **string, size_t nesting) { |
415 | JSON_Value *output_value = json_value_init_array(), *new_array_value = NULL; |
416 | JSON_Array *output_array = json_value_get_array(output_value); |
417 | if (!output_value) { return NULL; } |
418 | skip_char(string); |
419 | skip_whitespaces(string); |
420 | if (**string == ']') { /* empty array */ |
421 | skip_char(string); |
422 | return output_value; |
423 | } |
424 | while (**string != '\0') { |
425 | new_array_value = parse_value(string, nesting); |
426 | if (!new_array_value) { |
427 | json_value_free(output_value); |
428 | return NULL; |
429 | } |
430 | if(json_array_add(output_array, new_array_value) == ERROR) { |
431 | parson_free(new_array_value); |
432 | json_value_free(output_value); |
433 | return NULL; |
434 | } |
435 | skip_whitespaces(string); |
436 | if (**string != ',') { break; } |
437 | skip_char(string); |
438 | skip_whitespaces(string); |
439 | } |
440 | skip_whitespaces(string); |
441 | if (**string != ']' || /* Trim array after parsing is over */ |
442 | json_array_resize(output_array, json_array_get_count(output_array)) == ERROR) { |
443 | json_value_free(output_value); |
444 | return NULL; |
445 | } |
446 | skip_char(string); |
447 | return output_value; |
448 | } |
449 | |
450 | static JSON_Value * parse_string_value(const char **string) { |
451 | const char *new_string = get_processed_string(string); |
452 | if (!new_string) { return NULL; } |
453 | return json_value_init_string(new_string); |
454 | } |
455 | |
456 | static JSON_Value * parse_boolean_value(const char **string) { |
457 | size_t true_token_size = sizeof_token("true"); |
458 | size_t false_token_size = sizeof_token("false"); |
459 | if (strncmp("true", *string, true_token_size) == 0) { |
460 | *string += true_token_size; |
461 | return json_value_init_boolean(1); |
462 | } else if (strncmp("false", *string, false_token_size) == 0) { |
463 | *string += false_token_size; |
464 | return json_value_init_boolean(0); |
465 | } |
466 | return NULL; |
467 | } |
468 | |
469 | static JSON_Value * parse_number_value(const char **string) { |
470 | char *end; |
471 | double number = strtod(*string, &end); |
472 | JSON_Value *output_value; |
473 | if (is_decimal(*string, end - *string)) { |
474 | *string = end; |
475 | output_value = json_value_init_number(number); |
476 | } else { |
477 | output_value = NULL; |
478 | } |
479 | return output_value; |
480 | } |
481 | |
482 | static JSON_Value * parse_null_value(const char **string) { |
483 | size_t token_size = sizeof_token("null"); |
484 | if (strncmp("null", *string, token_size) == 0) { |
485 | *string += token_size; |
486 | return json_value_init_null(); |
487 | } |
488 | return NULL; |
489 | } |
490 | |
491 | /* Parser API */ |
492 | JSON_Value * json_parse_file(const char *filename) { |
493 | FILE *fp = fopen(filename, "r"); |
494 | size_t file_size; |
495 | char *file_contents; |
496 | JSON_Value *output_value; |
497 | if (!fp) { return NULL; } |
498 | fseek(fp, 0L, SEEK_END); |
499 | file_size = ftell(fp); |
500 | rewind(fp); |
501 | file_contents = (char*)parson_malloc(sizeof(char) * (file_size + 1)); |
502 | if (!file_contents) { fclose(fp); return NULL; } |
503 | fread(file_contents, file_size, 1, fp); |
504 | fclose(fp); |
505 | file_contents[file_size] = '\0'; |
506 | output_value = json_parse_string(file_contents); |
507 | parson_free(file_contents); |
508 | return output_value; |
509 | } |
510 | |
511 | JSON_Value * json_parse_string(const char *string) { |
512 | if (!string || (*string != '{' && *string != '[')) { return NULL; } |
513 | return parse_value((const char**)&string, 0); |
514 | } |
515 | |
516 | /* JSON Object API */ |
517 | JSON_Value * json_object_get_value(const JSON_Object *object, const char *name) { |
518 | return json_object_nget_value(object, name, strlen(name)); |
519 | } |
520 | |
521 | const char * json_object_get_string(const JSON_Object *object, const char *name) { |
522 | return json_value_get_string(json_object_get_value(object, name)); |
523 | } |
524 | |
525 | double json_object_get_number(const JSON_Object *object, const char *name) { |
526 | return json_value_get_number(json_object_get_value(object, name)); |
527 | } |
528 | |
529 | JSON_Object * json_object_get_object(const JSON_Object *object, const char *name) { |
530 | return json_value_get_object(json_object_get_value(object, name)); |
531 | } |
532 | |
533 | JSON_Array * json_object_get_array(const JSON_Object *object, const char *name) { |
534 | return json_value_get_array(json_object_get_value(object, name)); |
535 | } |
536 | |
537 | int json_object_get_boolean(const JSON_Object *object, const char *name) { |
538 | return json_value_get_boolean(json_object_get_value(object, name)); |
539 | } |
540 | |
541 | JSON_Value * json_object_dotget_value(const JSON_Object *object, const char *name) { |
542 | const char *dot_position = strchr(name, '.'); |
543 | if (!dot_position) { return json_object_get_value(object, name); } |
544 | object = json_value_get_object(json_object_nget_value(object, name, dot_position - name)); |
545 | return json_object_dotget_value(object, dot_position + 1); |
546 | } |
547 | |
548 | const char * json_object_dotget_string(const JSON_Object *object, const char *name) { |
549 | return json_value_get_string(json_object_dotget_value(object, name)); |
550 | } |
551 | |
552 | double json_object_dotget_number(const JSON_Object *object, const char *name) { |
553 | return json_value_get_number(json_object_dotget_value(object, name)); |
554 | } |
555 | |
556 | JSON_Object * json_object_dotget_object(const JSON_Object *object, const char *name) { |
557 | return json_value_get_object(json_object_dotget_value(object, name)); |
558 | } |
559 | |
560 | JSON_Array * json_object_dotget_array(const JSON_Object *object, const char *name) { |
561 | return json_value_get_array(json_object_dotget_value(object, name)); |
562 | } |
563 | |
564 | int json_object_dotget_boolean(const JSON_Object *object, const char *name) { |
565 | return json_value_get_boolean(json_object_dotget_value(object, name)); |
566 | } |
567 | |
568 | size_t json_object_get_count(const JSON_Object *object) { |
569 | return object ? object->count : 0; |
570 | } |
571 | |
572 | const char * json_object_get_name(const JSON_Object *object, size_t index) { |
573 | if (index >= json_object_get_count(object)) { return NULL; } |
574 | return object->names[index]; |
575 | } |
576 | |
577 | /* JSON Array API */ |
578 | JSON_Value * json_array_get_value(const JSON_Array *array, size_t index) { |
579 | if (index >= json_array_get_count(array)) { return NULL; } |
580 | return array->items[index]; |
581 | } |
582 | |
583 | const char * json_array_get_string(const JSON_Array *array, size_t index) { |
584 | return json_value_get_string(json_array_get_value(array, index)); |
585 | } |
586 | |
587 | double json_array_get_number(const JSON_Array *array, size_t index) { |
588 | return json_value_get_number(json_array_get_value(array, index)); |
589 | } |
590 | |
591 | JSON_Object * json_array_get_object(const JSON_Array *array, size_t index) { |
592 | return json_value_get_object(json_array_get_value(array, index)); |
593 | } |
594 | |
595 | JSON_Array * json_array_get_array(const JSON_Array *array, size_t index) { |
596 | return json_value_get_array(json_array_get_value(array, index)); |
597 | } |
598 | |
599 | int json_array_get_boolean(const JSON_Array *array, size_t index) { |
600 | return json_value_get_boolean(json_array_get_value(array, index)); |
601 | } |
602 | |
603 | size_t json_array_get_count(const JSON_Array *array) { |
604 | return array ? array->count : 0; |
605 | } |
606 | |
607 | /* JSON Value API */ |
608 | JSON_Value_Type json_value_get_type(const JSON_Value *value) { |
609 | return value ? value->type : JSONError; |
610 | } |
611 | |
612 | JSON_Object * json_value_get_object(const JSON_Value *value) { |
613 | return json_value_get_type(value) == JSONObject ? value->value.object : NULL; |
614 | } |
615 | |
616 | JSON_Array * json_value_get_array(const JSON_Value *value) { |
617 | return json_value_get_type(value) == JSONArray ? value->value.array : NULL; |
618 | } |
619 | |
620 | const char * json_value_get_string(const JSON_Value *value) { |
621 | return json_value_get_type(value) == JSONString ? value->value.string : NULL; |
622 | } |
623 | |
624 | double json_value_get_number(const JSON_Value *value) { |
625 | return json_value_get_type(value) == JSONNumber ? value->value.number : 0; |
626 | } |
627 | |
628 | int json_value_get_boolean(const JSON_Value *value) { |
629 | return json_value_get_type(value) == JSONBoolean ? value->value.boolean : -1; |
630 | } |
631 | |
632 | void json_value_free(JSON_Value *value) { |
633 | switch (json_value_get_type(value)) { |
634 | case JSONObject: |
635 | json_object_free(value->value.object); |
636 | break; |
637 | case JSONString: |
638 | if (value->value.string) { parson_free(value->value.string); } |
639 | break; |
640 | case JSONArray: |
641 | json_array_free(value->value.array); |
642 | break; |
643 | default: |
644 | break; |
645 | } |
646 | parson_free(value); |
647 | } |