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.
11 #include "jansson_private.h"
23 static const char *type_names[] = {
34 #define type_name(x) type_names[json_typeof(x)]
36 static const char *unpack_value_starters = "{[siIbfFOon";
39 static void scanner_init(scanner_t *s, json_error_t *error,
40 size_t flags, const char *fmt)
44 s->fmt = s->start = fmt;
49 static void next_token(scanner_t *s)
51 const char *t = s->fmt;
54 /* skip space and ignored chars */
55 while(*t == ' ' || *t == '\t' || *t == '\n' || *t == ',' || *t == ':') {
72 static void set_error(scanner_t *s, const char *source, const char *fmt, ...)
78 pos = (size_t)(s->fmt - s->start);
79 jsonp_error_vset(s->error, s->line, s->column, pos, fmt, ap);
81 jsonp_error_set_source(s->error, source);
86 static json_t *pack(scanner_t *s, va_list *ap);
88 static json_t *pack_object(scanner_t *s, va_list *ap)
90 json_t *object = json_object();
93 while(s->token != '}') {
98 set_error(s, "<format>", "Unexpected end of format string");
102 if(s->token != 's') {
103 set_error(s, "<format>", "Expected format 's', got '%c'", s->token);
107 key = va_arg(*ap, const char *);
109 set_error(s, "<args>", "NULL object key");
119 if(json_object_set_new(object, key, value)) {
120 set_error(s, "<internal>", "Unable to add key \"%s\"", key);
134 static json_t *pack_array(scanner_t *s, va_list *ap)
136 json_t *array = json_array();
139 while(s->token != ']') {
143 set_error(s, "<format>", "Unexpected end of format string");
151 if(json_array_append_new(array, value)) {
152 set_error(s, "<internal>", "Unable to append to array");
165 static json_t *pack(scanner_t *s, va_list *ap)
169 return pack_object(s, ap);
172 return pack_array(s, ap);
174 case 's': /* string */
176 const char *str = va_arg(*ap, const char *);
178 set_error(s, "<args>", "NULL string argument");
181 return json_string(str);
187 case 'b': /* boolean */
188 return va_arg(*ap, int) ? json_true() : json_false();
190 case 'i': /* integer from int */
191 return json_integer(va_arg(*ap, int));
193 case 'I': /* integer from json_int_t */
194 return json_integer(va_arg(*ap, json_int_t));
197 return json_real(va_arg(*ap, double));
199 case 'O': /* a json_t object; increments refcount */
200 return json_incref(va_arg(*ap, json_t *));
202 case 'o': /* a json_t object; doesn't increment refcount */
203 return va_arg(*ap, json_t *);
206 set_error(s, "<format>", "Unexpected format character '%c'",
212 static int unpack(scanner_t *s, json_t *root, va_list *ap);
214 static int unpack_object(scanner_t *s, json_t *root, va_list *ap)
219 /* Use a set (emulated by a hashtable) to check that all object
220 keys are accessed. Checking that the correct number of keys
221 were accessed is not enough, as the same key can be unpacked
226 if(hashtable_init(&key_set, jsonp_hash_key, jsonp_key_equal, NULL, NULL)) {
227 set_error(s, "<internal>", "Out of memory");
231 if(!json_is_object(root)) {
232 set_error(s, "<validation>", "Expected object, got %s",
238 while(s->token != '}') {
243 set_error(s, "<format>", "Expected '}' after '%c', got '%c'",
244 (strict == 1 ? '!' : '*'), s->token);
249 set_error(s, "<format>", "Unexpected end of format string");
253 if(s->token == '!' || s->token == '*') {
254 strict = (s->token == '!' ? 1 : -1);
259 if(s->token != 's') {
260 set_error(s, "<format>", "Expected format 's', got '%c'", s->token);
264 key = va_arg(*ap, const char *);
266 set_error(s, "<args>", "NULL object key");
272 value = json_object_get(root, key);
274 set_error(s, "<validation>", "Object item not found: %s", key);
278 if(unpack(s, value, ap))
281 hashtable_set(&key_set, (void *)key, NULL);
285 if(strict == 0 && (s->flags & JSON_STRICT))
288 if(strict == 1 && key_set.size != json_object_size(root)) {
289 long diff = (long)json_object_size(root) - (long)key_set.size;
290 set_error(s, "<validation>", "%li object item(s) left unpacked", diff);
297 hashtable_close(&key_set);
301 static int unpack_array(scanner_t *s, json_t *root, va_list *ap)
306 if(!json_is_array(root)) {
307 set_error(s, "<validation>", "Expected array, got %s", type_name(root));
312 while(s->token != ']') {
316 set_error(s, "<format>", "Expected ']' after '%c', got '%c'",
317 (strict == 1 ? '!' : '*'),
323 set_error(s, "<format>", "Unexpected end of format string");
327 if(s->token == '!' || s->token == '*') {
328 strict = (s->token == '!' ? 1 : -1);
333 if(!strchr(unpack_value_starters, s->token)) {
334 set_error(s, "<format>", "Unexpected format character '%c'",
339 value = json_array_get(root, i);
341 set_error(s, "<validation>", "Array index %lu out of range",
346 if(unpack(s, value, ap))
353 if(strict == 0 && (s->flags & JSON_STRICT))
356 if(strict == 1 && i != json_array_size(root)) {
357 long diff = (long)json_array_size(root) - (long)i;
358 set_error(s, "<validation>", "%li array item(s) left unpacked", diff);
365 static int unpack(scanner_t *s, json_t *root, va_list *ap)
370 return unpack_object(s, root, ap);
373 return unpack_array(s, root, ap);
376 if(!json_is_string(root)) {
377 set_error(s, "<validation>", "Expected string, got %s",
382 if(!(s->flags & JSON_VALIDATE_ONLY)) {
385 str = va_arg(*ap, const char **);
387 set_error(s, "<args>", "NULL string argument");
391 *str = json_string_value(root);
396 if(!json_is_integer(root)) {
397 set_error(s, "<validation>", "Expected integer, got %s",
402 if(!(s->flags & JSON_VALIDATE_ONLY))
403 *va_arg(*ap, int*) = json_integer_value(root);
408 if(!json_is_integer(root)) {
409 set_error(s, "<validation>", "Expected integer, got %s",
414 if(!(s->flags & JSON_VALIDATE_ONLY))
415 *va_arg(*ap, json_int_t*) = json_integer_value(root);
420 if(!json_is_boolean(root)) {
421 set_error(s, "<validation>", "Expected true or false, got %s",
426 if(!(s->flags & JSON_VALIDATE_ONLY))
427 *va_arg(*ap, int*) = json_is_true(root);
432 if(!json_is_real(root)) {
433 set_error(s, "<validation>", "Expected real, got %s",
438 if(!(s->flags & JSON_VALIDATE_ONLY))
439 *va_arg(*ap, double*) = json_real_value(root);
444 if(!json_is_number(root)) {
445 set_error(s, "<validation>", "Expected real or integer, got %s",
450 if(!(s->flags & JSON_VALIDATE_ONLY))
451 *va_arg(*ap, double*) = json_number_value(root);
456 if(!(s->flags & JSON_VALIDATE_ONLY))
461 if(!(s->flags & JSON_VALIDATE_ONLY))
462 *va_arg(*ap, json_t**) = root;
467 /* Never assign, just validate */
468 if(!json_is_null(root)) {
469 set_error(s, "<validation>", "Expected null, got %s",
476 set_error(s, "<format>", "Unexpected format character '%c'",
482 json_t *json_vpack_ex(json_error_t *error, size_t flags,
483 const char *fmt, va_list ap)
490 jsonp_error_init(error, "<format>");
491 jsonp_error_set(error, -1, -1, 0, "NULL or empty format string");
494 jsonp_error_init(error, NULL);
496 scanner_init(&s, error, flags, fmt);
499 va_copy(ap_copy, ap);
500 value = pack(&s, &ap_copy);
509 set_error(&s, "<format>", "Garbage after format string");
516 json_t *json_pack_ex(json_error_t *error, size_t flags, const char *fmt, ...)
522 value = json_vpack_ex(error, flags, fmt, ap);
528 json_t *json_pack(const char *fmt, ...)
534 value = json_vpack_ex(NULL, 0, fmt, ap);
540 int json_vunpack_ex(json_t *root, json_error_t *error, size_t flags,
541 const char *fmt, va_list ap)
547 jsonp_error_init(error, "<root>");
548 jsonp_error_set(error, -1, -1, 0, "NULL root value");
553 jsonp_error_init(error, "<format>");
554 jsonp_error_set(error, -1, -1, 0, "NULL or empty format string");
557 jsonp_error_init(error, NULL);
559 scanner_init(&s, error, flags, fmt);
562 va_copy(ap_copy, ap);
563 if(unpack(&s, root, &ap_copy)) {
571 set_error(&s, "<format>", "Garbage after format string");
578 int json_unpack_ex(json_t *root, json_error_t *error, size_t flags, const char *fmt, ...)
584 ret = json_vunpack_ex(root, error, flags, fmt, ap);
590 int json_unpack(json_t *root, const char *fmt, ...)
596 ret = json_vunpack_ex(root, NULL, 0, fmt, ap);