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comparison: src/ucx/json.c

src/ucx/json.c

changeset 579
e10457d74fe1
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1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 *
4 * Copyright 2024 Mike Becker, Olaf Wintermann All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "cx/json.h"
30
31 #include <string.h>
32 #include <assert.h>
33 #include <stdio.h>
34 #include <inttypes.h>
35
36 /*
37 * RFC 8259
38 * https://tools.ietf.org/html/rfc8259
39 */
40
41 static CxJsonValue cx_json_value_nothing = {.type = CX_JSON_NOTHING};
42
43 static int json_cmp_objvalue(const void *l, const void *r) {
44 const CxJsonObjValue *left = l;
45 const CxJsonObjValue *right = r;
46 return cx_strcmp(cx_strcast(left->name), cx_strcast(right->name));
47 }
48
49 static CxJsonObjValue *json_find_objvalue(const CxJsonValue *obj, cxstring name) {
50 assert(obj->type == CX_JSON_OBJECT);
51 CxJsonObjValue kv_dummy;
52 kv_dummy.name = cx_mutstrn((char*) name.ptr, name.length);
53 size_t index = cx_array_binary_search(
54 obj->value.object.values,
55 obj->value.object.values_size,
56 sizeof(CxJsonObjValue),
57 &kv_dummy,
58 json_cmp_objvalue
59 );
60 if (index == obj->value.object.values_size) {
61 return NULL;
62 } else {
63 return &obj->value.object.values[index];
64 }
65 }
66
67 static int json_add_objvalue(CxJsonValue *objv, CxJsonObjValue member) {
68 assert(objv->type == CX_JSON_OBJECT);
69 const CxAllocator * const al = objv->allocator;
70 CxJsonObject *obj = &(objv->value.object);
71
72 // determine the index where we need to insert the new member
73 size_t index = cx_array_binary_search_sup(
74 obj->values,
75 obj->values_size,
76 sizeof(CxJsonObjValue),
77 &member, json_cmp_objvalue
78 );
79
80 // is the name already present?
81 if (index < obj->values_size && 0 == json_cmp_objvalue(&member, &obj->values[index])) {
82 // free the original value
83 cx_strfree_a(al, &obj->values[index].name);
84 cxJsonValueFree(obj->values[index].value);
85 // replace the item
86 obj->values[index] = member;
87
88 // nothing more to do
89 return 0;
90 }
91
92 // determine the old capacity and reserve for one more element
93 CxArrayReallocator arealloc = cx_array_reallocator(al, NULL);
94 size_t oldcap = obj->values_capacity;
95 if (cx_array_simple_reserve_a(&arealloc, obj->values, 1)) return 1;
96
97 // check the new capacity, if we need to realloc the index array
98 size_t newcap = obj->values_capacity;
99 if (newcap > oldcap) {
100 if (cxReallocateArray(al, &obj->indices, newcap, sizeof(size_t))) {
101 return 1;
102 }
103 }
104
105 // check if append or insert
106 if (index < obj->values_size) {
107 // move the other elements
108 memmove(
109 &obj->values[index+1],
110 &obj->values[index],
111 (obj->values_size - index) * sizeof(CxJsonObjValue)
112 );
113 // increase indices for the moved elements
114 for (size_t i = 0; i < obj->values_size ; i++) {
115 if (obj->indices[i] >= index) {
116 obj->indices[i]++;
117 }
118 }
119 }
120
121 // insert the element and set the index
122 obj->values[index] = member;
123 obj->indices[obj->values_size] = index;
124 obj->values_size++;
125
126 return 0;
127 }
128
129 static void token_destroy(CxJsonToken *token) {
130 if (token->allocated) {
131 cx_strfree(&token->content);
132 }
133 }
134
135 static bool json_isdigit(char c) {
136 // TODO: remove once UCX has public API for this
137 return c >= '0' && c <= '9';
138 }
139
140 static bool json_isspace(char c) {
141 // TODO: remove once UCX has public API for this
142 return c == ' ' || c == '\t' || c == '\r' || c == '\n' || c == '\v' || c == '\f';
143 }
144
145 static int num_isexp(const char *content, size_t length, size_t pos) {
146 if (pos >= length) {
147 return 0;
148 }
149
150 int ok = 0;
151 for (size_t i = pos; i < length; i++) {
152 char c = content[i];
153 if (json_isdigit(c)) {
154 ok = 1;
155 } else if (i == pos) {
156 if (!(c == '+' || c == '-')) {
157 return 0;
158 }
159 } else {
160 return 0;
161 }
162 }
163
164 return ok;
165 }
166
167 static CxJsonTokenType token_numbertype(const char *content, size_t length) {
168 if (length == 0) return CX_JSON_TOKEN_ERROR;
169
170 if (content[0] != '-' && !json_isdigit(content[0])) {
171 return CX_JSON_TOKEN_ERROR;
172 }
173
174 CxJsonTokenType type = CX_JSON_TOKEN_INTEGER;
175 for (size_t i = 1; i < length; i++) {
176 if (content[i] == '.') {
177 if (type == CX_JSON_TOKEN_NUMBER) {
178 return CX_JSON_TOKEN_ERROR; // more than one decimal separator
179 }
180 type = CX_JSON_TOKEN_NUMBER;
181 } else if (content[i] == 'e' || content[i] == 'E') {
182 return num_isexp(content, length, i + 1) ? CX_JSON_TOKEN_NUMBER : CX_JSON_TOKEN_ERROR;
183 } else if (!json_isdigit(content[i])) {
184 return CX_JSON_TOKEN_ERROR; // char is not a digit, decimal separator or exponent sep
185 }
186 }
187
188 return type;
189 }
190
191 static CxJsonToken token_create(CxJson *json, bool isstring, size_t start, size_t end) {
192 cxmutstr str = cx_mutstrn(json->buffer.space + start, end - start);
193 bool allocated = false;
194 if (json->uncompleted.tokentype != CX_JSON_NO_TOKEN) {
195 allocated = true;
196 str = cx_strcat_m(json->uncompleted.content, 1, str);
197 if (str.ptr == NULL) { // LCOV_EXCL_START
198 return (CxJsonToken){CX_JSON_NO_TOKEN, false, {NULL, 0}};
199 } // LCOV_EXCL_STOP
200 }
201 json->uncompleted = (CxJsonToken){0};
202 CxJsonTokenType ttype;
203 if (isstring) {
204 ttype = CX_JSON_TOKEN_STRING;
205 } else {
206 cxstring s = cx_strcast(str);
207 if (!cx_strcmp(s, CX_STR("true")) || !cx_strcmp(s, CX_STR("false"))
208 || !cx_strcmp(s, CX_STR("null"))) {
209 ttype = CX_JSON_TOKEN_LITERAL;
210 } else {
211 ttype = token_numbertype(str.ptr, str.length);
212 }
213 }
214 if (ttype == CX_JSON_TOKEN_ERROR) {
215 if (allocated) {
216 cx_strfree(&str);
217 }
218 return (CxJsonToken){CX_JSON_TOKEN_ERROR, false, {NULL, 0}};
219 }
220 return (CxJsonToken){ttype, allocated, str};
221 }
222
223 static CxJsonTokenType char2ttype(char c) {
224 switch (c) {
225 case '[': {
226 return CX_JSON_TOKEN_BEGIN_ARRAY;
227 }
228 case '{': {
229 return CX_JSON_TOKEN_BEGIN_OBJECT;
230 }
231 case ']': {
232 return CX_JSON_TOKEN_END_ARRAY;
233 }
234 case '}': {
235 return CX_JSON_TOKEN_END_OBJECT;
236 }
237 case ':': {
238 return CX_JSON_TOKEN_NAME_SEPARATOR;
239 }
240 case ',': {
241 return CX_JSON_TOKEN_VALUE_SEPARATOR;
242 }
243 case '"': {
244 return CX_JSON_TOKEN_STRING;
245 }
246 default: {
247 if (json_isspace(c)) {
248 return CX_JSON_TOKEN_SPACE;
249 }
250 }
251 }
252 return CX_JSON_NO_TOKEN;
253 }
254
255 static enum cx_json_status token_parse_next(CxJson *json, CxJsonToken *result) {
256 // check if there is data in the buffer
257 if (cxBufferEof(&json->buffer)) {
258 return json->uncompleted.tokentype == CX_JSON_NO_TOKEN ?
259 CX_JSON_NO_DATA : CX_JSON_INCOMPLETE_DATA;
260 }
261
262 // current token type and start index
263 CxJsonTokenType ttype = json->uncompleted.tokentype;
264 size_t token_part_start = json->buffer.pos;
265
266 bool escape_end_of_string = ttype == CX_JSON_TOKEN_STRING
267 && json->uncompleted.content.ptr[json->uncompleted.content.length-1] == '\\';
268
269 for (size_t i = json->buffer.pos; i < json->buffer.size; i++) {
270 char c = json->buffer.space[i];
271 if (ttype != CX_JSON_TOKEN_STRING) {
272 // currently non-string token
273 CxJsonTokenType ctype = char2ttype(c); // start of new token?
274 if (ttype == CX_JSON_NO_TOKEN) {
275 if (ctype == CX_JSON_TOKEN_SPACE) {
276 json->buffer.pos++;
277 continue;
278 } else if (ctype == CX_JSON_TOKEN_STRING) {
279 // begin string
280 ttype = CX_JSON_TOKEN_STRING;
281 token_part_start = i;
282 } else if (ctype != CX_JSON_NO_TOKEN) {
283 // single-char token
284 json->buffer.pos = i + 1;
285 *result = (CxJsonToken){ctype, false, {NULL, 0}};
286 return CX_JSON_NO_ERROR;
287 } else {
288 ttype = CX_JSON_TOKEN_LITERAL; // number or literal
289 token_part_start = i;
290 }
291 } else {
292 // finish token
293 if (ctype != CX_JSON_NO_TOKEN) {
294 *result = token_create(json, false, token_part_start, i);
295 if (result->tokentype == CX_JSON_NO_TOKEN) {
296 return CX_JSON_BUFFER_ALLOC_FAILED; // LCOV_EXCL_LINE
297 }
298 if (result->tokentype == CX_JSON_TOKEN_ERROR) {
299 return CX_JSON_FORMAT_ERROR_NUMBER;
300 }
301 json->buffer.pos = i;
302 return CX_JSON_NO_ERROR;
303 }
304 }
305 } else {
306 // currently inside a string
307 if (escape_end_of_string) {
308 escape_end_of_string = false;
309 } else {
310 if (c == '"') {
311 *result = token_create(json, true, token_part_start, i + 1);
312 if (result->tokentype == CX_JSON_NO_TOKEN) {
313 return CX_JSON_BUFFER_ALLOC_FAILED; // LCOV_EXCL_LINE
314 }
315 json->buffer.pos = i + 1;
316 return CX_JSON_NO_ERROR;
317 } else if (c == '\\') {
318 escape_end_of_string = true;
319 }
320 }
321 }
322 }
323
324 if (ttype != CX_JSON_NO_TOKEN) {
325 // uncompleted token
326 size_t uncompleted_len = json->buffer.size - token_part_start;
327 if (json->uncompleted.tokentype == CX_JSON_NO_TOKEN) {
328 // current token is uncompleted
329 // save current token content
330 CxJsonToken uncompleted = {
331 ttype, true,
332 cx_strdup(cx_strn(json->buffer.space + token_part_start, uncompleted_len))
333 };
334 if (uncompleted.content.ptr == NULL) {
335 return CX_JSON_BUFFER_ALLOC_FAILED; // LCOV_EXCL_LINE
336 }
337 json->uncompleted = uncompleted;
338 } else {
339 // previously we also had an uncompleted token
340 // combine the uncompleted token with the current token
341 assert(json->uncompleted.allocated);
342 cxmutstr str = cx_strcat_m(json->uncompleted.content, 1,
343 cx_strn(json->buffer.space + token_part_start, uncompleted_len));
344 if (str.ptr == NULL) {
345 return CX_JSON_BUFFER_ALLOC_FAILED; // LCOV_EXCL_LINE
346 }
347 json->uncompleted.content = str;
348 }
349 // advance the buffer position - we saved the stuff in the uncompleted token
350 json->buffer.pos += uncompleted_len;
351 }
352
353 return CX_JSON_INCOMPLETE_DATA;
354 }
355
356 // converts a Unicode codepoint to utf8
357 static unsigned codepoint_to_utf8(uint32_t codepoint, char *output_buf) {
358 if (codepoint <= 0x7F) {
359 *output_buf = (char)codepoint;
360 return 1;
361 } else if (codepoint <= 0x7FF) {
362 output_buf[0] = (char)(0xC0 | ((codepoint >> 6) & 0x1F));
363 output_buf[1] = (char)(0x80 | (codepoint & 0x3F));
364 return 2;
365 } else if (codepoint <= 0xFFFF) {
366 output_buf[0] = (char)(0xE0 | ((codepoint >> 12) & 0x0F));
367 output_buf[1] = (char)(0x80 | ((codepoint >> 6) & 0x3F));
368 output_buf[2] = (char)(0x80 | (codepoint & 0x3F));
369 return 3;
370 } else if (codepoint <= 0x10FFFF) {
371 output_buf[0] = (char)(0xF0 | ((codepoint >> 18) & 0x07));
372 output_buf[1] = (char)(0x80 | ((codepoint >> 12) & 0x3F));
373 output_buf[2] = (char)(0x80 | ((codepoint >> 6) & 0x3F));
374 output_buf[3] = (char)(0x80 | (codepoint & 0x3F));
375 return 4;
376 }
377
378 return 0; // LCOV_EXCL_LINE
379 }
380
381 // converts a utf16 surrogate pair to utf8
382 static inline uint32_t utf16pair_to_codepoint(uint16_t c0, uint16_t c1) {
383 return ((c0 - 0xD800) << 10) + (c1 - 0xDC00) + 0x10000;
384 }
385
386 static unsigned unescape_unicode_string(cxstring str, char *utf8buf) {
387 // str is supposed to start with "\uXXXX" or "\uXXXX\uXXXX"
388 // remaining bytes in the string are ignored (str may be larger!)
389
390 if (str.length < 6 || str.ptr[0] != '\\' || str.ptr[1] != 'u') {
391 return 0;
392 }
393
394 unsigned utf8len = 0;
395 cxstring ustr1 = { str.ptr + 2, 4};
396 uint16_t utf16a, utf16b;
397 if (!cx_strtou16_lc(ustr1, &utf16a, 16, "")) {
398 uint32_t codepoint;
399 if (utf16a < 0xD800 || utf16a > 0xE000) {
400 // character is in the Basic Multilingual Plane
401 // and encoded as a single utf16 char
402 codepoint = utf16a;
403 utf8len = codepoint_to_utf8(codepoint, utf8buf);
404 } else if (utf16a >= 0xD800 && utf16a <= 0xDBFF) {
405 // character is encoded as a surrogate pair
406 // get next 6 bytes
407 if (str.length >= 12) {
408 if (str.ptr[6] == '\\' && str.ptr[7] == 'u') {
409 cxstring ustr2 = { str.ptr+8, 4 };
410 if (!cx_strtou16_lc(ustr2, &utf16b, 16, "")
411 && utf16b >= 0xDC00 && utf16b <= 0xDFFF) {
412 codepoint = utf16pair_to_codepoint(utf16a, utf16b);
413 utf8len = codepoint_to_utf8(codepoint, utf8buf);
414 }
415 }
416 }
417 }
418 }
419 return utf8len;
420 }
421
422 static cxmutstr unescape_string(const CxAllocator *a, cxmutstr str) {
423 // note: this function expects that str contains the enclosing quotes!
424
425 cxmutstr result;
426 result.length = 0;
427 result.ptr = cxMalloc(a, str.length - 1);
428 if (result.ptr == NULL) return result; // LCOV_EXCL_LINE
429
430 bool u = false;
431 for (size_t i = 1; i < str.length - 1; i++) {
432 char c = str.ptr[i];
433 if (u) {
434 u = false;
435 if (c == 'n') {
436 c = '\n';
437 } else if (c == '"') {
438 c = '"';
439 } else if (c == 't') {
440 c = '\t';
441 } else if (c == 'r') {
442 c = '\r';
443 } else if (c == '\\') {
444 c = '\\';
445 } else if (c == '/') {
446 c = '/'; // always unescape, we don't need settings here
447 } else if (c == 'f') {
448 c = '\f';
449 } else if (c == 'b') {
450 c = '\b';
451 } else if (c == 'u') {
452 char utf8buf[4];
453 unsigned utf8len = unescape_unicode_string(
454 cx_strn(str.ptr + i - 1, str.length + 1 - i),
455 utf8buf
456 );
457 if(utf8len > 0) {
458 i += utf8len < 4 ? 4 : 10;
459 // add all bytes from utf8buf except the last char
460 // to the result (last char will be added below)
461 utf8len--;
462 c = utf8buf[utf8len];
463 for (unsigned x = 0; x < utf8len; x++) {
464 result.ptr[result.length++] = utf8buf[x];
465 }
466 } else {
467 // decoding failed, ignore the entire sequence
468 result.ptr[result.length++] = '\\';
469 }
470 } else {
471 // TODO: discuss the behavior for unrecognized escape sequences
472 // most parsers throw an error here - we just ignore it
473 result.ptr[result.length++] = '\\';
474 }
475
476 result.ptr[result.length++] = c;
477 } else {
478 if (c == '\\') {
479 u = true;
480 } else {
481 result.ptr[result.length++] = c;
482 }
483 }
484 }
485 result.ptr[result.length] = 0;
486
487 return result;
488 }
489
490 static cxmutstr escape_string(cxmutstr str, bool escape_slash) {
491 // note: this function produces the string without enclosing quotes
492 // the reason is that we don't want to allocate memory just for that
493 CxBuffer buf = {0};
494
495 bool all_printable = true;
496 for (size_t i = 0; i < str.length; i++) {
497 unsigned char c = str.ptr[i];
498 bool escape = c < 0x20 || c == '\\' || c == '"'
499 || (escape_slash && c == '/');
500
501 if (all_printable && escape) {
502 size_t capa = str.length + 32;
503 char *space = malloc(capa);
504 if (space == NULL) return cx_mutstrn(NULL, 0);
505 cxBufferInit(&buf, space, capa, NULL, CX_BUFFER_AUTO_EXTEND);
506 cxBufferWrite(str.ptr, 1, i, &buf);
507 all_printable = false;
508 }
509 if (escape) {
510 cxBufferPut(&buf, '\\');
511 if (c == '\"') {
512 cxBufferPut(&buf, '\"');
513 } else if (c == '\n') {
514 cxBufferPut(&buf, 'n');
515 } else if (c == '\t') {
516 cxBufferPut(&buf, 't');
517 } else if (c == '\r') {
518 cxBufferPut(&buf, 'r');
519 } else if (c == '\\') {
520 cxBufferPut(&buf, '\\');
521 } else if (c == '/') {
522 cxBufferPut(&buf, '/');
523 } else if (c == '\f') {
524 cxBufferPut(&buf, 'f');
525 } else if (c == '\b') {
526 cxBufferPut(&buf, 'b');
527 } else {
528 char code[6];
529 snprintf(code, sizeof(code), "u%04x", (unsigned int) c);
530 cxBufferPutString(&buf, code);
531 }
532 } else if (!all_printable) {
533 cxBufferPut(&buf, c);
534 }
535 }
536 if (!all_printable) {
537 str = cx_mutstrn(buf.space, buf.size);
538 }
539 cxBufferDestroy(&buf);
540 return str;
541 }
542
543 static CxJsonValue* json_create_value(CxJson *json, CxJsonValueType type) {
544 CxJsonValue *v = cxCalloc(json->allocator, 1, sizeof(CxJsonValue));
545 if (v == NULL) return NULL; // LCOV_EXCL_LINE
546
547 // initialize the value
548 v->type = type;
549 v->allocator = json->allocator;
550 if (type == CX_JSON_ARRAY) {
551 cx_array_initialize_a(json->allocator, v->value.array.array, 16);
552 if (v->value.array.array == NULL) goto create_json_value_exit_error; // LCOV_EXCL_LINE
553 } else if (type == CX_JSON_OBJECT) {
554 cx_array_initialize_a(json->allocator, v->value.object.values, 16);
555 v->value.object.indices = cxCalloc(json->allocator, 16, sizeof(size_t));
556 if (v->value.object.values == NULL ||
557 v->value.object.indices == NULL)
558 goto create_json_value_exit_error; // LCOV_EXCL_LINE
559 }
560
561 // add the new value to a possible parent
562 if (json->vbuf_size > 0) {
563 CxJsonValue *parent = json->vbuf[json->vbuf_size - 1];
564 assert(parent != NULL);
565 if (parent->type == CX_JSON_ARRAY) {
566 CxArrayReallocator value_realloc = cx_array_reallocator(json->allocator, NULL);
567 if (cx_array_simple_add_a(&value_realloc, parent->value.array.array, v)) {
568 goto create_json_value_exit_error; // LCOV_EXCL_LINE
569 }
570 } else if (parent->type == CX_JSON_OBJECT) {
571 // the member was already created after parsing the name
572 assert(json->uncompleted_member.name.ptr != NULL);
573 json->uncompleted_member.value = v;
574 if (json_add_objvalue(parent, json->uncompleted_member)) {
575 goto create_json_value_exit_error; // LCOV_EXCL_LINE
576 }
577 json->uncompleted_member.name = (cxmutstr) {NULL, 0};
578 } else {
579 assert(false); // LCOV_EXCL_LINE
580 }
581 }
582
583 // add the new value to the stack, if it is an array or object
584 if (type == CX_JSON_ARRAY || type == CX_JSON_OBJECT) {
585 CxArrayReallocator vbuf_realloc = cx_array_reallocator(NULL, json->vbuf_internal);
586 if (cx_array_simple_add_a(&vbuf_realloc, json->vbuf, v)) {
587 goto create_json_value_exit_error; // LCOV_EXCL_LINE
588 }
589 }
590
591 // if currently no value is parsed, this is now the value of interest
592 if (json->parsed == NULL) {
593 json->parsed = v;
594 }
595
596 return v;
597 // LCOV_EXCL_START
598 create_json_value_exit_error:
599 cxJsonValueFree(v);
600 return NULL;
601 // LCOV_EXCL_STOP
602 }
603
604 #define JP_STATE_VALUE_BEGIN 0
605 #define JP_STATE_VALUE_END 10
606 #define JP_STATE_VALUE_BEGIN_OBJ 1
607 #define JP_STATE_OBJ_SEP_OR_CLOSE 11
608 #define JP_STATE_VALUE_BEGIN_AR 2
609 #define JP_STATE_ARRAY_SEP_OR_CLOSE 12
610 #define JP_STATE_OBJ_NAME_OR_CLOSE 5
611 #define JP_STATE_OBJ_NAME 6
612 #define JP_STATE_OBJ_COLON 7
613
614 void cxJsonInit(CxJson *json, const CxAllocator *allocator) {
615 if (allocator == NULL) {
616 allocator = cxDefaultAllocator;
617 }
618
619 memset(json, 0, sizeof(CxJson));
620 json->allocator = allocator;
621
622 json->states = json->states_internal;
623 json->states_capacity = cx_nmemb(json->states_internal);
624 json->states[0] = JP_STATE_VALUE_BEGIN;
625 json->states_size = 1;
626
627 json->vbuf = json->vbuf_internal;
628 json->vbuf_capacity = cx_nmemb(json->vbuf_internal);
629 }
630
631 void cxJsonDestroy(CxJson *json) {
632 cxBufferDestroy(&json->buffer);
633 if (json->states != json->states_internal) {
634 free(json->states);
635 }
636 if (json->vbuf != json->vbuf_internal) {
637 free(json->vbuf);
638 }
639 cxJsonValueFree(json->parsed);
640 json->parsed = NULL;
641 if (json->uncompleted_member.name.ptr != NULL) {
642 cx_strfree_a(json->allocator, &json->uncompleted_member.name);
643 json->uncompleted_member = (CxJsonObjValue){{NULL, 0}, NULL};
644 }
645 }
646
647 int cxJsonFilln(CxJson *json, const char *buf, size_t size) {
648 if (cxBufferEof(&json->buffer)) {
649 // reinitialize the buffer
650 cxBufferDestroy(&json->buffer);
651 cxBufferInit(&json->buffer, (char*) buf, size,
652 NULL, CX_BUFFER_AUTO_EXTEND | CX_BUFFER_COPY_ON_WRITE);
653 json->buffer.size = size;
654 return 0;
655 } else {
656 return size != cxBufferAppend(buf, 1, size, &json->buffer);
657 }
658 }
659
660 static void json_add_state(CxJson *json, int state) {
661 // we have guaranteed the necessary space with cx_array_simple_reserve()
662 // therefore, we can safely add the state in the simplest way possible
663 json->states[json->states_size++] = state;
664 }
665
666 #define return_rec(code) \
667 token_destroy(&token); \
668 return code
669
670 static enum cx_json_status json_parse(CxJson *json) {
671 // Reserve a pointer for a possibly read value
672 CxJsonValue *vbuf = NULL;
673
674 // grab the next token
675 CxJsonToken token;
676 {
677 enum cx_json_status ret = token_parse_next(json, &token);
678 if (ret != CX_JSON_NO_ERROR) {
679 return ret;
680 }
681 }
682
683 // pop the current state
684 assert(json->states_size > 0);
685 int state = json->states[--json->states_size];
686
687 // guarantee that at least two more states fit on the stack
688 CxArrayReallocator state_realloc = cx_array_reallocator(NULL, json->states_internal);
689 if (cx_array_simple_reserve_a(&state_realloc, json->states, 2)) {
690 return CX_JSON_BUFFER_ALLOC_FAILED; // LCOV_EXCL_LINE
691 }
692
693
694 // 0 JP_STATE_VALUE_BEGIN value begin
695 // 10 JP_STATE_VALUE_END expect value end
696 // 1 JP_STATE_VALUE_BEGIN_OBJ value begin (inside object)
697 // 11 JP_STATE_OBJ_SEP_OR_CLOSE object, expect separator, objclose
698 // 2 JP_STATE_VALUE_BEGIN_AR value begin (inside array)
699 // 12 JP_STATE_ARRAY_SEP_OR_CLOSE array, expect separator or arrayclose
700 // 5 JP_STATE_OBJ_NAME_OR_CLOSE object, expect name or objclose
701 // 6 JP_STATE_OBJ_NAME object, expect name
702 // 7 JP_STATE_OBJ_COLON object, expect ':'
703
704 if (state < 3) {
705 // push expected end state to the stack
706 json_add_state(json, 10 + state);
707 switch (token.tokentype) {
708 case CX_JSON_TOKEN_BEGIN_ARRAY: {
709 if (json_create_value(json, CX_JSON_ARRAY) == NULL) {
710 return_rec(CX_JSON_VALUE_ALLOC_FAILED); // LCOV_EXCL_LINE
711 }
712 json_add_state(json, JP_STATE_VALUE_BEGIN_AR);
713 return_rec(CX_JSON_NO_ERROR);
714 }
715 case CX_JSON_TOKEN_BEGIN_OBJECT: {
716 if (json_create_value(json, CX_JSON_OBJECT) == NULL) {
717 return_rec(CX_JSON_VALUE_ALLOC_FAILED); // LCOV_EXCL_LINE
718 }
719 json_add_state(json, JP_STATE_OBJ_NAME_OR_CLOSE);
720 return_rec(CX_JSON_NO_ERROR);
721 }
722 case CX_JSON_TOKEN_STRING: {
723 if ((vbuf = json_create_value(json, CX_JSON_STRING)) == NULL) {
724 return_rec(CX_JSON_VALUE_ALLOC_FAILED); // LCOV_EXCL_LINE
725 }
726 cxmutstr str = unescape_string(json->allocator, token.content);
727 if (str.ptr == NULL) {
728 return_rec(CX_JSON_VALUE_ALLOC_FAILED); // LCOV_EXCL_LINE
729 }
730 vbuf->value.string = str;
731 return_rec(CX_JSON_NO_ERROR);
732 }
733 case CX_JSON_TOKEN_INTEGER:
734 case CX_JSON_TOKEN_NUMBER: {
735 int type = token.tokentype == CX_JSON_TOKEN_INTEGER ? CX_JSON_INTEGER : CX_JSON_NUMBER;
736 if (NULL == (vbuf = json_create_value(json, type))) {
737 return_rec(CX_JSON_VALUE_ALLOC_FAILED); // LCOV_EXCL_LINE
738 }
739 if (type == CX_JSON_INTEGER) {
740 if (cx_strtoi64(token.content, &vbuf->value.integer, 10)) {
741 return_rec(CX_JSON_FORMAT_ERROR_NUMBER);
742 }
743 } else {
744 if (cx_strtod(token.content, &vbuf->value.number)) {
745 return_rec(CX_JSON_FORMAT_ERROR_NUMBER);
746 }
747 }
748 return_rec(CX_JSON_NO_ERROR);
749 }
750 case CX_JSON_TOKEN_LITERAL: {
751 if ((vbuf = json_create_value(json, CX_JSON_LITERAL)) == NULL) {
752 return_rec(CX_JSON_VALUE_ALLOC_FAILED); // LCOV_EXCL_LINE
753 }
754 if (0 == cx_strcmp(cx_strcast(token.content), cx_str("true"))) {
755 vbuf->value.literal = CX_JSON_TRUE;
756 } else if (0 == cx_strcmp(cx_strcast(token.content), cx_str("false"))) {
757 vbuf->value.literal = CX_JSON_FALSE;
758 } else {
759 vbuf->value.literal = CX_JSON_NULL;
760 }
761 return_rec(CX_JSON_NO_ERROR);
762 }
763 default: {
764 return_rec(CX_JSON_FORMAT_ERROR_UNEXPECTED_TOKEN);
765 }
766 }
767 } else if (state == JP_STATE_ARRAY_SEP_OR_CLOSE) {
768 // expect ',' or ']'
769 if (token.tokentype == CX_JSON_TOKEN_VALUE_SEPARATOR) {
770 json_add_state(json, JP_STATE_VALUE_BEGIN_AR);
771 return_rec(CX_JSON_NO_ERROR);
772 } else if (token.tokentype == CX_JSON_TOKEN_END_ARRAY) {
773 // discard the array from the value buffer
774 json->vbuf_size--;
775 return_rec(CX_JSON_NO_ERROR);
776 } else {
777 return_rec(CX_JSON_FORMAT_ERROR_UNEXPECTED_TOKEN);
778 }
779 } else if (state == JP_STATE_OBJ_NAME_OR_CLOSE || state == JP_STATE_OBJ_NAME) {
780 if (state == JP_STATE_OBJ_NAME_OR_CLOSE && token.tokentype == CX_JSON_TOKEN_END_OBJECT) {
781 // discard the obj from the value buffer
782 json->vbuf_size--;
783 return_rec(CX_JSON_NO_ERROR);
784 } else {
785 // expect string
786 if (token.tokentype != CX_JSON_TOKEN_STRING) {
787 return_rec(CX_JSON_FORMAT_ERROR_UNEXPECTED_TOKEN);
788 }
789
790 // add new entry
791 cxmutstr name = unescape_string(json->allocator, token.content);
792 if (name.ptr == NULL) {
793 return_rec(CX_JSON_VALUE_ALLOC_FAILED); // LCOV_EXCL_LINE
794 }
795 assert(json->uncompleted_member.name.ptr == NULL);
796 json->uncompleted_member.name = name;
797 assert(json->vbuf_size > 0);
798
799 // next state
800 json_add_state(json, JP_STATE_OBJ_COLON);
801 return_rec(CX_JSON_NO_ERROR);
802 }
803 } else if (state == JP_STATE_OBJ_COLON) {
804 // expect ':'
805 if (token.tokentype != CX_JSON_TOKEN_NAME_SEPARATOR) {
806 return_rec(CX_JSON_FORMAT_ERROR_UNEXPECTED_TOKEN);
807 }
808 // next state
809 json_add_state(json, JP_STATE_VALUE_BEGIN_OBJ);
810 return_rec(CX_JSON_NO_ERROR);
811 } else if (state == JP_STATE_OBJ_SEP_OR_CLOSE) {
812 // expect ',' or '}'
813 if (token.tokentype == CX_JSON_TOKEN_VALUE_SEPARATOR) {
814 json_add_state(json, JP_STATE_OBJ_NAME);
815 return_rec(CX_JSON_NO_ERROR);
816 } else if (token.tokentype == CX_JSON_TOKEN_END_OBJECT) {
817 // discard the obj from the value buffer
818 json->vbuf_size--;
819 return_rec(CX_JSON_NO_ERROR);
820 } else {
821 return_rec(CX_JSON_FORMAT_ERROR_UNEXPECTED_TOKEN);
822 }
823 } else {
824 // should be unreachable
825 assert(false);
826 return_rec(-1);
827 }
828 }
829
830 CxJsonStatus cxJsonNext(CxJson *json, CxJsonValue **value) {
831 // check if buffer has been filled
832 if (json->buffer.space == NULL) {
833 return CX_JSON_NULL_DATA;
834 }
835
836 // initialize output value
837 *value = &cx_json_value_nothing;
838
839 // parse data
840 CxJsonStatus result;
841 do {
842 result = json_parse(json);
843 if (result == CX_JSON_NO_ERROR && json->states_size == 1) {
844 // final state reached
845 assert(json->states[0] == JP_STATE_VALUE_END);
846 assert(json->vbuf_size == 0);
847
848 // write output value
849 *value = json->parsed;
850 json->parsed = NULL;
851
852 // re-initialize state machine
853 json->states[0] = JP_STATE_VALUE_BEGIN;
854
855 return CX_JSON_NO_ERROR;
856 }
857 } while (result == CX_JSON_NO_ERROR);
858
859 // the parser might think there is no data
860 // but when we did not reach the final state,
861 // we know that there must be more to come
862 if (result == CX_JSON_NO_DATA && json->states_size > 1) {
863 return CX_JSON_INCOMPLETE_DATA;
864 }
865
866 return result;
867 }
868
869 void cxJsonValueFree(CxJsonValue *value) {
870 if (value == NULL || value->type == CX_JSON_NOTHING) return;
871 switch (value->type) {
872 case CX_JSON_OBJECT: {
873 CxJsonObject obj = value->value.object;
874 for (size_t i = 0; i < obj.values_size; i++) {
875 cxJsonValueFree(obj.values[i].value);
876 cx_strfree_a(value->allocator, &obj.values[i].name);
877 }
878 cxFree(value->allocator, obj.values);
879 cxFree(value->allocator, obj.indices);
880 break;
881 }
882 case CX_JSON_ARRAY: {
883 CxJsonArray array = value->value.array;
884 for (size_t i = 0; i < array.array_size; i++) {
885 cxJsonValueFree(array.array[i]);
886 }
887 cxFree(value->allocator, array.array);
888 break;
889 }
890 case CX_JSON_STRING: {
891 cxFree(value->allocator, value->value.string.ptr);
892 break;
893 }
894 default: {
895 break;
896 }
897 }
898 cxFree(value->allocator, value);
899 }
900
901 CxJsonValue* cxJsonCreateObj(const CxAllocator* allocator) {
902 if (allocator == NULL) allocator = cxDefaultAllocator;
903 CxJsonValue* v = cxMalloc(allocator, sizeof(CxJsonValue));
904 if (v == NULL) return NULL;
905 v->allocator = allocator;
906 v->type = CX_JSON_OBJECT;
907 cx_array_initialize_a(allocator, v->value.object.values, 16);
908 if (v->value.object.values == NULL) { // LCOV_EXCL_START
909 cxFree(allocator, v);
910 return NULL;
911 // LCOV_EXCL_STOP
912 }
913 v->value.object.indices = cxCalloc(allocator, 16, sizeof(size_t));
914 if (v->value.object.indices == NULL) { // LCOV_EXCL_START
915 cxFree(allocator, v->value.object.values);
916 cxFree(allocator, v);
917 return NULL;
918 // LCOV_EXCL_STOP
919 }
920 return v;
921 }
922
923 CxJsonValue* cxJsonCreateArr(const CxAllocator* allocator) {
924 if (allocator == NULL) allocator = cxDefaultAllocator;
925 CxJsonValue* v = cxMalloc(allocator, sizeof(CxJsonValue));
926 if (v == NULL) return NULL;
927 v->allocator = allocator;
928 v->type = CX_JSON_ARRAY;
929 cx_array_initialize_a(allocator, v->value.array.array, 16);
930 if (v->value.array.array == NULL) { cxFree(allocator, v); return NULL; }
931 return v;
932 }
933
934 CxJsonValue* cxJsonCreateNumber(const CxAllocator* allocator, double num) {
935 if (allocator == NULL) allocator = cxDefaultAllocator;
936 CxJsonValue* v = cxMalloc(allocator, sizeof(CxJsonValue));
937 if (v == NULL) return NULL;
938 v->allocator = allocator;
939 v->type = CX_JSON_NUMBER;
940 v->value.number = num;
941 return v;
942 }
943
944 CxJsonValue* cxJsonCreateInteger(const CxAllocator* allocator, int64_t num) {
945 if (allocator == NULL) allocator = cxDefaultAllocator;
946 CxJsonValue* v = cxMalloc(allocator, sizeof(CxJsonValue));
947 if (v == NULL) return NULL;
948 v->allocator = allocator;
949 v->type = CX_JSON_INTEGER;
950 v->value.integer = num;
951 return v;
952 }
953
954 CxJsonValue* cxJsonCreateString(const CxAllocator* allocator, const char* str) {
955 return cxJsonCreateCxString(allocator, cx_str(str));
956 }
957
958 CxJsonValue* cxJsonCreateCxString(const CxAllocator* allocator, cxstring str) {
959 if (allocator == NULL) allocator = cxDefaultAllocator;
960 CxJsonValue* v = cxMalloc(allocator, sizeof(CxJsonValue));
961 if (v == NULL) return NULL;
962 v->allocator = allocator;
963 v->type = CX_JSON_STRING;
964 cxmutstr s = cx_strdup_a(allocator, str);
965 if (s.ptr == NULL) { cxFree(allocator, v); return NULL; }
966 v->value.string = s;
967 return v;
968 }
969
970 CxJsonValue* cxJsonCreateLiteral(const CxAllocator* allocator, CxJsonLiteral lit) {
971 if (allocator == NULL) allocator = cxDefaultAllocator;
972 CxJsonValue* v = cxMalloc(allocator, sizeof(CxJsonValue));
973 if (v == NULL) return NULL;
974 v->allocator = allocator;
975 v->type = CX_JSON_LITERAL;
976 v->value.literal = lit;
977 return v;
978 }
979
980 // LCOV_EXCL_START
981 // never called as long as malloc() does not return NULL
982 static void json_arr_free_temp(CxJsonValue** values, size_t count) {
983 for (size_t i = 0; i < count; i++) {
984 if (values[i] == NULL) break;
985 cxJsonValueFree(values[i]);
986 }
987 free(values);
988 }
989 // LCOV_EXCL_STOP
990
991 int cxJsonArrAddNumbers(CxJsonValue* arr, const double* num, size_t count) {
992 CxJsonValue** values = calloc(count, sizeof(CxJsonValue*));
993 if (values == NULL) return -1;
994 for (size_t i = 0; i < count; i++) {
995 values[i] = cxJsonCreateNumber(arr->allocator, num[i]);
996 if (values[i] == NULL) { json_arr_free_temp(values, count); return -1; }
997 }
998 int ret = cxJsonArrAddValues(arr, values, count);
999 free(values);
1000 return ret;
1001 }
1002
1003 int cxJsonArrAddIntegers(CxJsonValue* arr, const int64_t* num, size_t count) {
1004 CxJsonValue** values = calloc(count, sizeof(CxJsonValue*));
1005 if (values == NULL) return -1;
1006 for (size_t i = 0; i < count; i++) {
1007 values[i] = cxJsonCreateInteger(arr->allocator, num[i]);
1008 if (values[i] == NULL) { json_arr_free_temp(values, count); return -1; }
1009 }
1010 int ret = cxJsonArrAddValues(arr, values, count);
1011 free(values);
1012 return ret;
1013 }
1014
1015 int cxJsonArrAddStrings(CxJsonValue* arr, const char* const* str, size_t count) {
1016 CxJsonValue** values = calloc(count, sizeof(CxJsonValue*));
1017 if (values == NULL) return -1;
1018 for (size_t i = 0; i < count; i++) {
1019 values[i] = cxJsonCreateString(arr->allocator, str[i]);
1020 if (values[i] == NULL) { json_arr_free_temp(values, count); return -1; }
1021 }
1022 int ret = cxJsonArrAddValues(arr, values, count);
1023 free(values);
1024 return ret;
1025 }
1026
1027 int cxJsonArrAddCxStrings(CxJsonValue* arr, const cxstring* str, size_t count) {
1028 CxJsonValue** values = calloc(count, sizeof(CxJsonValue*));
1029 if (values == NULL) return -1;
1030 for (size_t i = 0; i < count; i++) {
1031 values[i] = cxJsonCreateCxString(arr->allocator, str[i]);
1032 if (values[i] == NULL) { json_arr_free_temp(values, count); return -1; }
1033 }
1034 int ret = cxJsonArrAddValues(arr, values, count);
1035 free(values);
1036 return ret;
1037 }
1038
1039 int cxJsonArrAddLiterals(CxJsonValue* arr, const CxJsonLiteral* lit, size_t count) {
1040 CxJsonValue** values = calloc(count, sizeof(CxJsonValue*));
1041 if (values == NULL) return -1;
1042 for (size_t i = 0; i < count; i++) {
1043 values[i] = cxJsonCreateLiteral(arr->allocator, lit[i]);
1044 if (values[i] == NULL) { json_arr_free_temp(values, count); return -1; }
1045 }
1046 int ret = cxJsonArrAddValues(arr, values, count);
1047 free(values);
1048 return ret;
1049 }
1050
1051 int cxJsonArrAddValues(CxJsonValue* arr, CxJsonValue* const* val, size_t count) {
1052 CxArrayReallocator value_realloc = cx_array_reallocator(arr->allocator, NULL);
1053 assert(arr->type == CX_JSON_ARRAY);
1054 return cx_array_simple_copy_a(&value_realloc,
1055 arr->value.array.array,
1056 arr->value.array.array_size,
1057 val, count
1058 );
1059 }
1060
1061 int cxJsonObjPut(CxJsonValue* obj, cxstring name, CxJsonValue* child) {
1062 cxmutstr k = cx_strdup_a(obj->allocator, name);
1063 if (k.ptr == NULL) return -1;
1064 CxJsonObjValue kv = {k, child};
1065 if (json_add_objvalue(obj, kv)) {
1066 cx_strfree_a(obj->allocator, &k);
1067 return 1;
1068 } else {
1069 return 0;
1070 }
1071 }
1072
1073 CxJsonValue* cxJsonObjPutObj(CxJsonValue* obj, cxstring name) {
1074 CxJsonValue* v = cxJsonCreateObj(obj->allocator);
1075 if (v == NULL) return NULL;
1076 if (cxJsonObjPut(obj, name, v)) { cxJsonValueFree(v); return NULL; }
1077 return v;
1078 }
1079
1080 CxJsonValue* cxJsonObjPutArr(CxJsonValue* obj, cxstring name) {
1081 CxJsonValue* v = cxJsonCreateArr(obj->allocator);
1082 if (v == NULL) return NULL;
1083 if (cxJsonObjPut(obj, name, v)) { cxJsonValueFree(v); return NULL; }
1084 return v;
1085 }
1086
1087 CxJsonValue* cxJsonObjPutNumber(CxJsonValue* obj, cxstring name, double num) {
1088 CxJsonValue* v = cxJsonCreateNumber(obj->allocator, num);
1089 if (v == NULL) return NULL;
1090 if (cxJsonObjPut(obj, name, v)) { cxJsonValueFree(v); return NULL; }
1091 return v;
1092 }
1093
1094 CxJsonValue* cxJsonObjPutInteger(CxJsonValue* obj, cxstring name, int64_t num) {
1095 CxJsonValue* v = cxJsonCreateInteger(obj->allocator, num);
1096 if (v == NULL) return NULL;
1097 if (cxJsonObjPut(obj, name, v)) { cxJsonValueFree(v); return NULL; }
1098 return v;
1099 }
1100
1101 CxJsonValue* cxJsonObjPutString(CxJsonValue* obj, cxstring name, const char* str) {
1102 CxJsonValue* v = cxJsonCreateString(obj->allocator, str);
1103 if (v == NULL) return NULL;
1104 if (cxJsonObjPut(obj, name, v)) { cxJsonValueFree(v); return NULL; }
1105 return v;
1106 }
1107
1108 CxJsonValue* cxJsonObjPutCxString(CxJsonValue* obj, cxstring name, cxstring str) {
1109 CxJsonValue* v = cxJsonCreateCxString(obj->allocator, str);
1110 if (v == NULL) return NULL;
1111 if (cxJsonObjPut(obj, name, v)) { cxJsonValueFree(v); return NULL; }
1112 return v;
1113 }
1114
1115 CxJsonValue* cxJsonObjPutLiteral(CxJsonValue* obj, cxstring name, CxJsonLiteral lit) {
1116 CxJsonValue* v = cxJsonCreateLiteral(obj->allocator, lit);
1117 if (v == NULL) return NULL;
1118 if (cxJsonObjPut(obj, name, v)) { cxJsonValueFree(v); return NULL;}
1119 return v;
1120 }
1121
1122 CxJsonValue *cxJsonArrGet(const CxJsonValue *value, size_t index) {
1123 if (index >= value->value.array.array_size) {
1124 return &cx_json_value_nothing;
1125 }
1126 return value->value.array.array[index];
1127 }
1128
1129 CxIterator cxJsonArrIter(const CxJsonValue *value) {
1130 return cxIteratorPtr(
1131 value->value.array.array,
1132 value->value.array.array_size
1133 );
1134 }
1135
1136 CxIterator cxJsonObjIter(const CxJsonValue *value) {
1137 return cxIterator(
1138 value->value.object.values,
1139 sizeof(CxJsonObjValue),
1140 value->value.object.values_size
1141 );
1142 }
1143
1144 CxJsonValue *cx_json_obj_get_cxstr(const CxJsonValue *value, cxstring name) {
1145 CxJsonObjValue *member = json_find_objvalue(value, name);
1146 if (member == NULL) {
1147 return &cx_json_value_nothing;
1148 } else {
1149 return member->value;
1150 }
1151 }
1152
1153 CxJsonWriter cxJsonWriterCompact(void) {
1154 return (CxJsonWriter) {
1155 false,
1156 true,
1157 6,
1158 false,
1159 4,
1160 false
1161 };
1162 }
1163
1164 CxJsonWriter cxJsonWriterPretty(bool use_spaces) {
1165 return (CxJsonWriter) {
1166 true,
1167 true,
1168 6,
1169 use_spaces,
1170 4,
1171 false
1172 };
1173 }
1174
1175 static int cx_json_writer_indent(
1176 void *target,
1177 cx_write_func wfunc,
1178 const CxJsonWriter *settings,
1179 unsigned int depth
1180 ) {
1181 if (depth == 0) return 0;
1182
1183 // determine the width and characters to use
1184 const char* indent; // for 32 prepared chars
1185 size_t width = depth;
1186 if (settings->indent_space) {
1187 if (settings->indent == 0) return 0;
1188 width *= settings->indent;
1189 indent = " ";
1190 } else {
1191 indent = "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t";
1192 }
1193
1194 // calculate the number of write calls and write
1195 size_t full = width / 32;
1196 size_t remaining = width % 32;
1197 for (size_t i = 0; i < full; i++) {
1198 if (32 != wfunc(indent, 1, 32, target)) return 1;
1199 }
1200 if (remaining != wfunc(indent, 1, remaining, target)) return 1;
1201
1202 return 0;
1203 }
1204
1205
1206 int cx_json_write_rec(
1207 void *target,
1208 const CxJsonValue *value,
1209 cx_write_func wfunc,
1210 const CxJsonWriter *settings,
1211 unsigned int depth
1212 ) {
1213 // keep track of written items
1214 // the idea is to reduce the number of jumps for error checking
1215 size_t actual = 0, expected = 0;
1216
1217 // small buffer for number to string conversions
1218 char numbuf[40];
1219
1220 // recursively write the values
1221 switch (value->type) {
1222 case CX_JSON_OBJECT: {
1223 const char *begin_obj = "{\n";
1224 if (settings->pretty) {
1225 actual += wfunc(begin_obj, 1, 2, target);
1226 expected += 2;
1227 } else {
1228 actual += wfunc(begin_obj, 1, 1, target);
1229 expected++;
1230 }
1231 depth++;
1232 size_t elem_count = value->value.object.values_size;
1233 for (size_t look_idx = 0; look_idx < elem_count; look_idx++) {
1234 // get the member either via index array or directly
1235 size_t elem_idx = settings->sort_members
1236 ? look_idx
1237 : value->value.object.indices[look_idx];
1238 CxJsonObjValue *member = &value->value.object.values[elem_idx];
1239 if (settings->sort_members) {
1240 depth++;depth--;
1241 }
1242
1243 // possible indentation
1244 if (settings->pretty) {
1245 if (cx_json_writer_indent(target, wfunc, settings, depth)) {
1246 return 1; // LCOV_EXCL_LINE
1247 }
1248 }
1249
1250 // the name
1251 actual += wfunc("\"", 1, 1, target);
1252 cxmutstr name = escape_string(member->name, settings->escape_slash);
1253 actual += wfunc(name.ptr, 1, name.length, target);
1254 if (name.ptr != member->name.ptr) {
1255 cx_strfree(&name);
1256 }
1257 actual += wfunc("\"", 1, 1, target);
1258 const char *obj_name_sep = ": ";
1259 if (settings->pretty) {
1260 actual += wfunc(obj_name_sep, 1, 2, target);
1261 expected += 4 + member->name.length;
1262 } else {
1263 actual += wfunc(obj_name_sep, 1, 1, target);
1264 expected += 3 + member->name.length;
1265 }
1266
1267 // the value
1268 if (cx_json_write_rec(target, member->value, wfunc, settings, depth)) return 1;
1269
1270 // end of object-value
1271 if (look_idx < elem_count - 1) {
1272 const char *obj_value_sep = ",\n";
1273 if (settings->pretty) {
1274 actual += wfunc(obj_value_sep, 1, 2, target);
1275 expected += 2;
1276 } else {
1277 actual += wfunc(obj_value_sep, 1, 1, target);
1278 expected++;
1279 }
1280 } else {
1281 if (settings->pretty) {
1282 actual += wfunc("\n", 1, 1, target);
1283 expected ++;
1284 }
1285 }
1286 }
1287 depth--;
1288 if (settings->pretty) {
1289 if (cx_json_writer_indent(target, wfunc, settings, depth)) return 1;
1290 }
1291 actual += wfunc("}", 1, 1, target);
1292 expected++;
1293 break;
1294 }
1295 case CX_JSON_ARRAY: {
1296 actual += wfunc("[", 1, 1, target);
1297 expected++;
1298 CxIterator iter = cxJsonArrIter(value);
1299 cx_foreach(CxJsonValue*, element, iter) {
1300 if (cx_json_write_rec(
1301 target, element,
1302 wfunc, settings, depth)
1303 ) return 1;
1304
1305 if (iter.index < iter.elem_count - 1) {
1306 const char *arr_value_sep = ", ";
1307 if (settings->pretty) {
1308 actual += wfunc(arr_value_sep, 1, 2, target);
1309 expected += 2;
1310 } else {
1311 actual += wfunc(arr_value_sep, 1, 1, target);
1312 expected++;
1313 }
1314 }
1315 }
1316 actual += wfunc("]", 1, 1, target);
1317 expected++;
1318 break;
1319 }
1320 case CX_JSON_STRING: {
1321 actual += wfunc("\"", 1, 1, target);
1322 cxmutstr str = escape_string(value->value.string, settings->escape_slash);
1323 actual += wfunc(str.ptr, 1, str.length, target);
1324 if (str.ptr != value->value.string.ptr) {
1325 cx_strfree(&str);
1326 }
1327 actual += wfunc("\"", 1, 1, target);
1328 expected += 2 + value->value.string.length;
1329 break;
1330 }
1331 case CX_JSON_NUMBER: {
1332 int precision = settings->frac_max_digits;
1333 // because of the way how %g is defined, we need to
1334 // double the precision and truncate ourselves
1335 precision = 1 + (precision > 15 ? 30 : 2 * precision);
1336 snprintf(numbuf, 40, "%.*g", precision, value->value.number);
1337 char *dot, *exp;
1338 unsigned char max_digits;
1339 // find the decimal separator and hope that it's one of . or ,
1340 dot = strchr(numbuf, '.');
1341 if (dot == NULL) {
1342 dot = strchr(numbuf, ',');
1343 }
1344 if (dot == NULL) {
1345 // no decimal separator found
1346 // output everything until a possible exponent
1347 max_digits = 30;
1348 dot = numbuf;
1349 } else {
1350 // found a decimal separator
1351 // output everything until the separator
1352 // and set max digits to what the settings say
1353 size_t len = dot - numbuf;
1354 actual += wfunc(numbuf, 1, len, target);
1355 expected += len;
1356 max_digits = settings->frac_max_digits;
1357 if (max_digits > 15) {
1358 max_digits = 15;
1359 }
1360 // locale independent separator
1361 if (max_digits > 0) {
1362 actual += wfunc(".", 1, 1, target);
1363 expected++;
1364 }
1365 dot++;
1366 }
1367 // find the exponent
1368 exp = strchr(dot, 'e');
1369 if (exp == NULL) {
1370 // no exponent - output the rest
1371 if (max_digits > 0) {
1372 size_t len = strlen(dot);
1373 if (len > max_digits) {
1374 len = max_digits;
1375 }
1376 actual += wfunc(dot, 1, len, target);
1377 expected += len;
1378 }
1379 } else {
1380 // exponent found - truncate the frac digits
1381 // and then output the rest
1382 if (max_digits > 0) {
1383 size_t len = exp - dot - 1;
1384 if (len > max_digits) {
1385 len = max_digits;
1386 }
1387 actual += wfunc(dot, 1, len, target);
1388 expected += len;
1389 }
1390 actual += wfunc("e", 1, 1, target);
1391 expected++;
1392 exp++;
1393 size_t len = strlen(exp);
1394 actual += wfunc(exp, 1, len, target);
1395 expected += len;
1396 }
1397 break;
1398 }
1399 case CX_JSON_INTEGER: {
1400 snprintf(numbuf, 32, "%" PRIi64, value->value.integer);
1401 size_t len = strlen(numbuf);
1402 actual += wfunc(numbuf, 1, len, target);
1403 expected += len;
1404 break;
1405 }
1406 case CX_JSON_LITERAL: {
1407 if (value->value.literal == CX_JSON_TRUE) {
1408 actual += wfunc("true", 1, 4, target);
1409 expected += 4;
1410 } else if (value->value.literal == CX_JSON_FALSE) {
1411 actual += wfunc("false", 1, 5, target);
1412 expected += 5;
1413 } else {
1414 actual += wfunc("null", 1, 4, target);
1415 expected += 4;
1416 }
1417 break;
1418 }
1419 case CX_JSON_NOTHING: {
1420 // deliberately supported as an empty string!
1421 // users might want to just write the result
1422 // of a get operation without testing the value
1423 // and therefore this should not blow up
1424 break;
1425 }
1426 default: assert(false); // LCOV_EXCL_LINE
1427 }
1428
1429 return expected != actual;
1430 }
1431
1432 int cxJsonWrite(
1433 void *target,
1434 const CxJsonValue *value,
1435 cx_write_func wfunc,
1436 const CxJsonWriter *settings
1437 ) {
1438 assert(target != NULL);
1439 assert(value != NULL);
1440 assert(wfunc != NULL);
1441
1442 CxJsonWriter writer_default = cxJsonWriterCompact();
1443 if (settings == NULL) {
1444 settings = &writer_default;
1445 }
1446 return cx_json_write_rec(target, value, wfunc, settings, 0);
1447 }

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