2 * Copyright (c) 2009-2011 Petri Lehtinen <petri@digip.org>
3 * Copyright (c) 2011 Graeme Smecher <graeme.smecher@mail.mcgill.ca>
5 * Jansson is free software; you can redistribute it and/or modify
6 * it under the terms of the MIT license. See LICENSE for details.
10 #include "jansson_private.h"
21 static const char *type_names[] = {
32 #define type_name(x) type_names[json_typeof(x)]
34 static void next_token(scanner_t *s)
36 const char *t = s->fmt;
39 /* skip space and ignored chars */
40 while(*t == ' ' || *t == '\t' || *t == '\n' || *t == ',' || *t == ':') {
57 static void set_error(scanner_t *s, const char *fmt, ...)
61 jsonp_error_vset(s->error, s->line, s->column, fmt, ap);
65 static json_t *pack(scanner_t *s, va_list *ap);
67 static json_t *pack_object(scanner_t *s, va_list *ap)
69 json_t *object = json_object();
72 while(s->token != '}') {
77 set_error(s, "Unexpected end of format string");
82 set_error(s, "Expected format 's', got '%c'\n", *s->fmt);
86 key = va_arg(*ap, const char *);
88 set_error(s, "NULL object key");
98 if(json_object_set_new(object, key, value)) {
99 set_error(s, "Unable to add key \"%s\"", key);
113 static json_t *pack_array(scanner_t *s, va_list *ap)
115 json_t *array = json_array();
118 while(s->token != ']') {
122 set_error(s, "Unexpected end of format string");
130 if(json_array_append_new(array, value)) {
131 set_error(s, "Unable to append to array");
144 static json_t *pack(scanner_t *s, va_list *ap)
148 return pack_object(s, ap);
151 return pack_array(s, ap);
153 case 's': /* string */
155 const char *str = va_arg(*ap, const char *);
157 set_error(s, "NULL string");
160 return json_string(str);
166 case 'b': /* boolean */
167 return va_arg(*ap, int) ? json_true() : json_false();
169 case 'i': /* integer from int */
170 return json_integer(va_arg(*ap, int));
172 case 'I': /* integer from json_int_t */
173 return json_integer(va_arg(*ap, json_int_t));
176 return json_real(va_arg(*ap, double));
178 case 'O': /* a json_t object; increments refcount */
179 return json_incref(va_arg(*ap, json_t *));
181 case 'o': /* a json_t object; doesn't increment refcount */
182 return va_arg(*ap, json_t *);
185 set_error(s, "Unrecognized format character '%c'", s->token);
190 static int unpack(scanner_t *s, json_t *root, va_list *ap);
192 static int unpack_object(scanner_t *s, json_t *root, va_list *ap)
197 /* Use a set (emulated by a hashtable) to check that all object
198 keys are accessed. Checking that the correct number of keys
199 were accessed is not enough, as the same key can be unpacked
204 if(hashtable_init(&key_set, jsonp_hash_key, jsonp_key_equal, NULL, NULL)) {
205 set_error(s, "Out of memory");
209 if(!json_is_object(root)) {
210 set_error(s, "Expected object, got %s", type_name(root));
215 while(s->token != '}') {
220 set_error(s, "Expected '}' after '%c', got '%c'",
221 (strict == 1 ? '!' : '*'), s->token);
226 set_error(s, "Unexpected end of format string");
230 if(s->token == '!' || s->token == '*') {
231 strict = (s->token == '!' ? 1 : -1);
236 if(s->token != 's') {
237 set_error(s, "Expected format 's', got '%c'\n", *s->fmt);
241 key = va_arg(*ap, const char *);
243 set_error(s, "NULL object key");
249 value = json_object_get(root, key);
250 if(unpack(s, value, ap))
253 hashtable_set(&key_set, (void *)key, NULL);
257 if(strict == 0 && (s->flags & JSON_STRICT))
260 if(strict == 1 && key_set.size != json_object_size(root)) {
261 long diff = (long)json_object_size(root) - (long)key_set.size;
262 set_error(s, "%li object items left unpacked", diff);
269 hashtable_close(&key_set);
273 static int unpack_array(scanner_t *s, json_t *root, va_list *ap)
278 if(!json_is_array(root)) {
279 set_error(s, "Expected array, got %s", type_name(root));
284 while(s->token != ']') {
288 set_error(s, "Expected ']' after '%c', got '%c'",
289 (strict == 1 ? '!' : '*'),
295 set_error(s, "Unexpected end of format string");
299 if(s->token == '!' || s->token == '*') {
300 strict = (s->token == '!' ? 1 : -1);
305 value = json_array_get(root, i);
307 set_error(s, "Array index %lu out of range", (unsigned long)i);
311 if(unpack(s, value, ap))
318 if(strict == 0 && (s->flags & JSON_STRICT))
321 if(strict == 1 && i != json_array_size(root)) {
322 long diff = (long)json_array_size(root) - (long)i;
323 set_error(s, "%li array items left upacked", diff);
330 static int unpack(scanner_t *s, json_t *root, va_list *ap)
335 return unpack_object(s, root, ap);
338 return unpack_array(s, root, ap);
341 if(!json_is_string(root)) {
342 set_error(s, "Expected string, got %s", type_name(root));
346 if(!(s->flags & JSON_VALIDATE_ONLY)) {
349 str = va_arg(*ap, const char **);
351 set_error(s, "NULL string");
355 *str = json_string_value(root);
360 if(!json_is_integer(root)) {
361 set_error(s, "Expected integer, got %s", type_name(root));
365 if(!(s->flags & JSON_VALIDATE_ONLY))
366 *va_arg(*ap, int*) = json_integer_value(root);
371 if(!json_is_integer(root)) {
372 set_error(s, "Expected integer, got %s", type_name(root));
376 if(!(s->flags & JSON_VALIDATE_ONLY))
377 *va_arg(*ap, json_int_t*) = json_integer_value(root);
382 if(!json_is_boolean(root)) {
383 set_error(s, "Expected true or false, got %s", type_name(root));
387 if(!(s->flags & JSON_VALIDATE_ONLY))
388 *va_arg(*ap, int*) = json_is_true(root);
393 if(!json_is_real(root)) {
394 set_error(s, "Expected real, got %s", type_name(root));
398 if(!(s->flags & JSON_VALIDATE_ONLY))
399 *va_arg(*ap, double*) = json_real_value(root);
404 if(!json_is_number(root)) {
405 set_error(s, "Expected real or integer, got %s",
410 if(!(s->flags & JSON_VALIDATE_ONLY))
411 *va_arg(*ap, double*) = json_number_value(root);
416 if(!(s->flags & JSON_VALIDATE_ONLY))
421 if(!(s->flags & JSON_VALIDATE_ONLY))
422 *va_arg(*ap, json_t**) = root;
427 /* Never assign, just validate */
428 if(!json_is_null(root)) {
429 set_error(s, "Expected null, got %s", type_name(root));
435 set_error(s, "Unknown format character '%c'", s->token);
440 json_t *json_vpack_ex(json_error_t *error, size_t flags,
441 const char *fmt, va_list ap)
447 jsonp_error_init(error, "");
450 jsonp_error_set(error, 1, 1, "Null or empty format string");
461 va_copy(ap_copy, ap);
462 value = pack(&s, &ap_copy);
468 set_error(&s, "Garbage after format string");
475 json_t *json_pack_ex(json_error_t *error, size_t flags, const char *fmt, ...)
481 value = json_vpack_ex(error, flags, fmt, ap);
487 json_t *json_pack(const char *fmt, ...)
493 value = json_vpack_ex(NULL, 0, fmt, ap);
499 int json_vunpack_ex(json_t *root, json_error_t *error, size_t flags,
500 const char *fmt, va_list ap)
505 jsonp_error_init(error, "");
508 jsonp_error_set(error, 1, 1, "Null or empty format string");
520 va_copy(ap_copy, ap);
521 if(unpack(&s, root, &ap_copy)) {
529 set_error(&s, "Garbage after format string");
536 int json_unpack_ex(json_t *root, json_error_t *error, size_t flags, const char *fmt, ...)
542 ret = json_vunpack_ex(root, error, flags, fmt, ap);
548 int json_unpack(json_t *root, const char *fmt, ...)
554 ret = json_vunpack_ex(root, NULL, 0, fmt, ap);