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"
22 static const char *type_names[] = {
33 #define type_name(x) type_names[json_typeof(x)]
35 static void next_token(scanner_t *s)
37 const char *t = s->fmt;
40 /* skip space and ignored chars */
41 while(*t == ' ' || *t == '\t' || *t == '\n' || *t == ',' || *t == ':') {
58 static void set_error(scanner_t *s, const char *fmt, ...)
64 pos = (size_t)(s->fmt - s->start);
65 jsonp_error_vset(s->error, s->line, s->column, pos, fmt, ap);
70 static json_t *pack(scanner_t *s, va_list *ap);
72 static json_t *pack_object(scanner_t *s, va_list *ap)
74 json_t *object = json_object();
77 while(s->token != '}') {
82 set_error(s, "Unexpected end of format string");
87 set_error(s, "Expected format 's', got '%c'\n", *s->fmt);
91 key = va_arg(*ap, const char *);
93 set_error(s, "NULL object key");
103 if(json_object_set_new(object, key, value)) {
104 set_error(s, "Unable to add key \"%s\"", key);
118 static json_t *pack_array(scanner_t *s, va_list *ap)
120 json_t *array = json_array();
123 while(s->token != ']') {
127 set_error(s, "Unexpected end of format string");
135 if(json_array_append_new(array, value)) {
136 set_error(s, "Unable to append to array");
149 static json_t *pack(scanner_t *s, va_list *ap)
153 return pack_object(s, ap);
156 return pack_array(s, ap);
158 case 's': /* string */
160 const char *str = va_arg(*ap, const char *);
162 set_error(s, "NULL string");
165 return json_string(str);
171 case 'b': /* boolean */
172 return va_arg(*ap, int) ? json_true() : json_false();
174 case 'i': /* integer from int */
175 return json_integer(va_arg(*ap, int));
177 case 'I': /* integer from json_int_t */
178 return json_integer(va_arg(*ap, json_int_t));
181 return json_real(va_arg(*ap, double));
183 case 'O': /* a json_t object; increments refcount */
184 return json_incref(va_arg(*ap, json_t *));
186 case 'o': /* a json_t object; doesn't increment refcount */
187 return va_arg(*ap, json_t *);
190 set_error(s, "Unrecognized format character '%c'", s->token);
195 static int unpack(scanner_t *s, json_t *root, va_list *ap);
197 static int unpack_object(scanner_t *s, json_t *root, va_list *ap)
202 /* Use a set (emulated by a hashtable) to check that all object
203 keys are accessed. Checking that the correct number of keys
204 were accessed is not enough, as the same key can be unpacked
209 if(hashtable_init(&key_set, jsonp_hash_key, jsonp_key_equal, NULL, NULL)) {
210 set_error(s, "Out of memory");
214 if(!json_is_object(root)) {
215 set_error(s, "Expected object, got %s", type_name(root));
220 while(s->token != '}') {
225 set_error(s, "Expected '}' after '%c', got '%c'",
226 (strict == 1 ? '!' : '*'), s->token);
231 set_error(s, "Unexpected end of format string");
235 if(s->token == '!' || s->token == '*') {
236 strict = (s->token == '!' ? 1 : -1);
241 if(s->token != 's') {
242 set_error(s, "Expected format 's', got '%c'\n", *s->fmt);
246 key = va_arg(*ap, const char *);
248 set_error(s, "NULL object key");
254 value = json_object_get(root, key);
255 if(unpack(s, value, ap))
258 hashtable_set(&key_set, (void *)key, NULL);
262 if(strict == 0 && (s->flags & JSON_STRICT))
265 if(strict == 1 && key_set.size != json_object_size(root)) {
266 long diff = (long)json_object_size(root) - (long)key_set.size;
267 set_error(s, "%li object items left unpacked", diff);
274 hashtable_close(&key_set);
278 static int unpack_array(scanner_t *s, json_t *root, va_list *ap)
283 if(!json_is_array(root)) {
284 set_error(s, "Expected array, got %s", type_name(root));
289 while(s->token != ']') {
293 set_error(s, "Expected ']' after '%c', got '%c'",
294 (strict == 1 ? '!' : '*'),
300 set_error(s, "Unexpected end of format string");
304 if(s->token == '!' || s->token == '*') {
305 strict = (s->token == '!' ? 1 : -1);
310 value = json_array_get(root, i);
312 set_error(s, "Array index %lu out of range", (unsigned long)i);
316 if(unpack(s, value, ap))
323 if(strict == 0 && (s->flags & JSON_STRICT))
326 if(strict == 1 && i != json_array_size(root)) {
327 long diff = (long)json_array_size(root) - (long)i;
328 set_error(s, "%li array items left upacked", diff);
335 static int unpack(scanner_t *s, json_t *root, va_list *ap)
340 return unpack_object(s, root, ap);
343 return unpack_array(s, root, ap);
346 if(!json_is_string(root)) {
347 set_error(s, "Expected string, got %s", type_name(root));
351 if(!(s->flags & JSON_VALIDATE_ONLY)) {
354 str = va_arg(*ap, const char **);
356 set_error(s, "NULL string");
360 *str = json_string_value(root);
365 if(!json_is_integer(root)) {
366 set_error(s, "Expected integer, got %s", type_name(root));
370 if(!(s->flags & JSON_VALIDATE_ONLY))
371 *va_arg(*ap, int*) = json_integer_value(root);
376 if(!json_is_integer(root)) {
377 set_error(s, "Expected integer, got %s", type_name(root));
381 if(!(s->flags & JSON_VALIDATE_ONLY))
382 *va_arg(*ap, json_int_t*) = json_integer_value(root);
387 if(!json_is_boolean(root)) {
388 set_error(s, "Expected true or false, got %s", type_name(root));
392 if(!(s->flags & JSON_VALIDATE_ONLY))
393 *va_arg(*ap, int*) = json_is_true(root);
398 if(!json_is_real(root)) {
399 set_error(s, "Expected real, got %s", type_name(root));
403 if(!(s->flags & JSON_VALIDATE_ONLY))
404 *va_arg(*ap, double*) = json_real_value(root);
409 if(!json_is_number(root)) {
410 set_error(s, "Expected real or integer, got %s",
415 if(!(s->flags & JSON_VALIDATE_ONLY))
416 *va_arg(*ap, double*) = json_number_value(root);
421 if(!(s->flags & JSON_VALIDATE_ONLY))
426 if(!(s->flags & JSON_VALIDATE_ONLY))
427 *va_arg(*ap, json_t**) = root;
432 /* Never assign, just validate */
433 if(!json_is_null(root)) {
434 set_error(s, "Expected null, got %s", type_name(root));
440 set_error(s, "Unknown format character '%c'", s->token);
445 json_t *json_vpack_ex(json_error_t *error, size_t flags,
446 const char *fmt, va_list ap)
452 jsonp_error_init(error, "");
455 jsonp_error_set(error, -1, -1, 0, "Null or empty format string");
461 s.fmt = s.start = fmt;
466 va_copy(ap_copy, ap);
467 value = pack(&s, &ap_copy);
473 set_error(&s, "Garbage after format string");
480 json_t *json_pack_ex(json_error_t *error, size_t flags, const char *fmt, ...)
486 value = json_vpack_ex(error, flags, fmt, ap);
492 json_t *json_pack(const char *fmt, ...)
498 value = json_vpack_ex(NULL, 0, fmt, ap);
504 int json_vunpack_ex(json_t *root, json_error_t *error, size_t flags,
505 const char *fmt, va_list ap)
510 jsonp_error_init(error, "");
513 jsonp_error_set(error, -1, -1, 0, "Null or empty format string");
519 s.fmt = s.start = fmt;
525 va_copy(ap_copy, ap);
526 if(unpack(&s, root, &ap_copy)) {
534 set_error(&s, "Garbage after format string");
541 int json_unpack_ex(json_t *root, json_error_t *error, size_t flags, const char *fmt, ...)
547 ret = json_vunpack_ex(root, error, flags, fmt, ap);
553 int json_unpack(json_t *root, const char *fmt, ...)
559 ret = json_vunpack_ex(root, NULL, 0, fmt, ap);