2 * Copyright (c) 2010 Serge A. Zaitsev
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * Slightly modified by AK to not assume 0 terminated input.
29 * Allocates a fresh unused token from the token pool.
31 static jsmntok_t *jsmn_alloc_token(jsmn_parser *parser,
32 jsmntok_t *tokens, size_t num_tokens)
36 if ((unsigned)parser->toknext >= num_tokens)
38 tok = &tokens[parser->toknext++];
39 tok->start = tok->end = -1;
45 * Fills token type and boundaries.
47 static void jsmn_fill_token(jsmntok_t *token, jsmntype_t type,
57 * Fills next available token with JSON primitive.
59 static jsmnerr_t jsmn_parse_primitive(jsmn_parser *parser, const char *js,
61 jsmntok_t *tokens, size_t num_tokens)
68 for (; parser->pos < len; parser->pos++) {
69 switch (js[parser->pos]) {
72 * In strict mode primitive must be followed by ","
88 if (js[parser->pos] < 32 || js[parser->pos] >= 127) {
90 return JSMN_ERROR_INVAL;
95 * In strict mode primitive must be followed by a
99 return JSMN_ERROR_PART;
103 token = jsmn_alloc_token(parser, tokens, num_tokens);
106 return JSMN_ERROR_NOMEM;
108 jsmn_fill_token(token, JSMN_PRIMITIVE, start, parser->pos);
109 parser->pos--; /* parent sees closing brackets */
114 * Fills next token with JSON string.
116 static jsmnerr_t jsmn_parse_string(jsmn_parser *parser, const char *js,
118 jsmntok_t *tokens, size_t num_tokens)
121 int start = parser->pos;
123 /* Skip starting quote */
126 for (; parser->pos < len; parser->pos++) {
127 char c = js[parser->pos];
129 /* Quote: end of string */
131 token = jsmn_alloc_token(parser, tokens, num_tokens);
134 return JSMN_ERROR_NOMEM;
136 jsmn_fill_token(token, JSMN_STRING, start+1,
141 /* Backslash: Quoted symbol expected */
144 switch (js[parser->pos]) {
145 /* Allowed escaped symbols */
155 /* Allows escaped symbol \uXXXX */
159 /* Unexpected symbol */
162 return JSMN_ERROR_INVAL;
167 return JSMN_ERROR_PART;
171 * Parse JSON string and fill tokens.
173 jsmnerr_t jsmn_parse(jsmn_parser *parser, const char *js, size_t len,
174 jsmntok_t *tokens, unsigned int num_tokens)
180 for (; parser->pos < len; parser->pos++) {
188 token = jsmn_alloc_token(parser, tokens, num_tokens);
190 return JSMN_ERROR_NOMEM;
191 if (parser->toksuper != -1)
192 tokens[parser->toksuper].size++;
193 token->type = (c == '{' ? JSMN_OBJECT : JSMN_ARRAY);
194 token->start = parser->pos;
195 parser->toksuper = parser->toknext - 1;
199 type = (c == '}' ? JSMN_OBJECT : JSMN_ARRAY);
200 for (i = parser->toknext - 1; i >= 0; i--) {
202 if (token->start != -1 && token->end == -1) {
203 if (token->type != type)
204 return JSMN_ERROR_INVAL;
205 parser->toksuper = -1;
206 token->end = parser->pos + 1;
210 /* Error if unmatched closing bracket */
212 return JSMN_ERROR_INVAL;
213 for (; i >= 0; i--) {
215 if (token->start != -1 && token->end == -1) {
216 parser->toksuper = i;
222 r = jsmn_parse_string(parser, js, len, tokens,
226 if (parser->toksuper != -1)
227 tokens[parser->toksuper].size++;
238 * In strict mode primitives are:
239 * numbers and booleans.
257 * In non-strict mode every unquoted value
263 r = jsmn_parse_primitive(parser, js, len, tokens,
267 if (parser->toksuper != -1)
268 tokens[parser->toksuper].size++;
272 /* Unexpected char in strict mode */
274 return JSMN_ERROR_INVAL;
279 for (i = parser->toknext - 1; i >= 0; i--) {
280 /* Unmatched opened object or array */
281 if (tokens[i].start != -1 && tokens[i].end == -1)
282 return JSMN_ERROR_PART;
289 * Creates a new parser based over a given buffer with an array of tokens
292 void jsmn_init(jsmn_parser *parser)
296 parser->toksuper = -1;
299 const char *jsmn_strerror(jsmnerr_t err)
302 case JSMN_ERROR_NOMEM:
303 return "No enough tokens";
304 case JSMN_ERROR_INVAL:
305 return "Invalid character inside JSON string";
306 case JSMN_ERROR_PART:
307 return "The string is not a full JSON packet, more bytes expected";
311 return "Unknown json error";