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.
32 * Allocates a fresh unused token from the token pool.
34 static jsmntok_t *jsmn_alloc_token(jsmn_parser *parser,
35 jsmntok_t *tokens, size_t num_tokens)
39 if ((unsigned)parser->toknext >= num_tokens)
41 tok = &tokens[parser->toknext++];
42 tok->start = tok->end = -1;
48 * Fills token type and boundaries.
50 static void jsmn_fill_token(jsmntok_t *token, jsmntype_t type,
60 * Fills next available token with JSON primitive.
62 static jsmnerr_t jsmn_parse_primitive(jsmn_parser *parser, const char *js,
64 jsmntok_t *tokens, size_t num_tokens)
71 for (; parser->pos < len; parser->pos++) {
72 switch (js[parser->pos]) {
75 * In strict mode primitive must be followed by ","
91 if (js[parser->pos] < 32 || js[parser->pos] >= 127) {
93 return JSMN_ERROR_INVAL;
98 * In strict mode primitive must be followed by a
102 return JSMN_ERROR_PART;
106 token = jsmn_alloc_token(parser, tokens, num_tokens);
109 return JSMN_ERROR_NOMEM;
111 jsmn_fill_token(token, JSMN_PRIMITIVE, start, parser->pos);
112 parser->pos--; /* parent sees closing brackets */
117 * Fills next token with JSON string.
119 static jsmnerr_t jsmn_parse_string(jsmn_parser *parser, const char *js,
121 jsmntok_t *tokens, size_t num_tokens)
124 int start = parser->pos;
126 /* Skip starting quote */
129 for (; parser->pos < len; parser->pos++) {
130 char c = js[parser->pos];
132 /* Quote: end of string */
134 token = jsmn_alloc_token(parser, tokens, num_tokens);
137 return JSMN_ERROR_NOMEM;
139 jsmn_fill_token(token, JSMN_STRING, start+1,
144 /* Backslash: Quoted symbol expected */
147 switch (js[parser->pos]) {
148 /* Allowed escaped symbols */
158 /* Allows escaped symbol \uXXXX */
162 /* Unexpected symbol */
165 return JSMN_ERROR_INVAL;
170 return JSMN_ERROR_PART;
174 * Parse JSON string and fill tokens.
176 jsmnerr_t jsmn_parse(jsmn_parser *parser, const char *js, size_t len,
177 jsmntok_t *tokens, unsigned int num_tokens)
183 for (; parser->pos < len; parser->pos++) {
191 token = jsmn_alloc_token(parser, tokens, num_tokens);
193 return JSMN_ERROR_NOMEM;
194 if (parser->toksuper != -1)
195 tokens[parser->toksuper].size++;
196 token->type = (c == '{' ? JSMN_OBJECT : JSMN_ARRAY);
197 token->start = parser->pos;
198 parser->toksuper = parser->toknext - 1;
202 type = (c == '}' ? JSMN_OBJECT : JSMN_ARRAY);
203 for (i = parser->toknext - 1; i >= 0; i--) {
205 if (token->start != -1 && token->end == -1) {
206 if (token->type != type)
207 return JSMN_ERROR_INVAL;
208 parser->toksuper = -1;
209 token->end = parser->pos + 1;
213 /* Error if unmatched closing bracket */
215 return JSMN_ERROR_INVAL;
216 for (; i >= 0; i--) {
218 if (token->start != -1 && token->end == -1) {
219 parser->toksuper = i;
225 r = jsmn_parse_string(parser, js, len, tokens,
229 if (parser->toksuper != -1)
230 tokens[parser->toksuper].size++;
241 * In strict mode primitives are:
242 * numbers and booleans.
260 * In non-strict mode every unquoted value
266 r = jsmn_parse_primitive(parser, js, len, tokens,
270 if (parser->toksuper != -1)
271 tokens[parser->toksuper].size++;
275 /* Unexpected char in strict mode */
277 return JSMN_ERROR_INVAL;
282 for (i = parser->toknext - 1; i >= 0; i--) {
283 /* Unmatched opened object or array */
284 if (tokens[i].start != -1 && tokens[i].end == -1)
285 return JSMN_ERROR_PART;
292 * Creates a new parser based over a given buffer with an array of tokens
295 void jsmn_init(jsmn_parser *parser)
299 parser->toksuper = -1;
302 const char *jsmn_strerror(jsmnerr_t err)
305 case JSMN_ERROR_NOMEM:
306 return "No enough tokens";
307 case JSMN_ERROR_INVAL:
308 return "Invalid character inside JSON string";
309 case JSMN_ERROR_PART:
310 return "The string is not a full JSON packet, more bytes expected";
314 return "Unknown json error";