Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 1 | #include "jsmn.h" |
| 2 | |
| 3 | /** |
Haibo Huang | 983ec7f | 2019-02-01 17:05:26 -0800 | [diff] [blame] | 4 | * Allocates a fresh unused token from the token pool. |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 5 | */ |
| 6 | static jsmntok_t *jsmn_alloc_token(jsmn_parser *parser, |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 7 | jsmntok_t *tokens, size_t num_tokens) { |
| 8 | jsmntok_t *tok; |
| 9 | if (parser->toknext >= num_tokens) { |
| 10 | return NULL; |
| 11 | } |
| 12 | tok = &tokens[parser->toknext++]; |
| 13 | tok->start = tok->end = -1; |
| 14 | tok->size = 0; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 15 | #ifdef JSMN_PARENT_LINKS |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 16 | tok->parent = -1; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 17 | #endif |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 18 | return tok; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 19 | } |
| 20 | |
| 21 | /** |
| 22 | * Fills token type and boundaries. |
| 23 | */ |
| 24 | static void jsmn_fill_token(jsmntok_t *token, jsmntype_t type, |
| 25 | int start, int end) { |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 26 | token->type = type; |
| 27 | token->start = start; |
| 28 | token->end = end; |
| 29 | token->size = 0; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 30 | } |
| 31 | |
| 32 | /** |
| 33 | * Fills next available token with JSON primitive. |
| 34 | */ |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 35 | static int jsmn_parse_primitive(jsmn_parser *parser, const char *js, |
| 36 | size_t len, jsmntok_t *tokens, size_t num_tokens) { |
| 37 | jsmntok_t *token; |
| 38 | int start; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 39 | |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 40 | start = parser->pos; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 41 | |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 42 | for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) { |
| 43 | switch (js[parser->pos]) { |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 44 | #ifndef JSMN_STRICT |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 45 | /* In strict mode primitive must be followed by "," or "}" or "]" */ |
| 46 | case ':': |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 47 | #endif |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 48 | case '\t' : case '\r' : case '\n' : case ' ' : |
| 49 | case ',' : case ']' : case '}' : |
| 50 | goto found; |
| 51 | } |
| 52 | if (js[parser->pos] < 32 || js[parser->pos] >= 127) { |
| 53 | parser->pos = start; |
| 54 | return JSMN_ERROR_INVAL; |
| 55 | } |
| 56 | } |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 57 | #ifdef JSMN_STRICT |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 58 | /* In strict mode primitive must be followed by a comma/object/array */ |
| 59 | parser->pos = start; |
| 60 | return JSMN_ERROR_PART; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 61 | #endif |
| 62 | |
| 63 | found: |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 64 | if (tokens == NULL) { |
| 65 | parser->pos--; |
| 66 | return 0; |
| 67 | } |
| 68 | token = jsmn_alloc_token(parser, tokens, num_tokens); |
| 69 | if (token == NULL) { |
| 70 | parser->pos = start; |
| 71 | return JSMN_ERROR_NOMEM; |
| 72 | } |
| 73 | jsmn_fill_token(token, JSMN_PRIMITIVE, start, parser->pos); |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 74 | #ifdef JSMN_PARENT_LINKS |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 75 | token->parent = parser->toksuper; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 76 | #endif |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 77 | parser->pos--; |
| 78 | return 0; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 79 | } |
| 80 | |
| 81 | /** |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 82 | * Fills next token with JSON string. |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 83 | */ |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 84 | static int jsmn_parse_string(jsmn_parser *parser, const char *js, |
| 85 | size_t len, jsmntok_t *tokens, size_t num_tokens) { |
| 86 | jsmntok_t *token; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 87 | |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 88 | int start = parser->pos; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 89 | |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 90 | parser->pos++; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 91 | |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 92 | /* Skip starting quote */ |
| 93 | for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) { |
| 94 | char c = js[parser->pos]; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 95 | |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 96 | /* Quote: end of string */ |
| 97 | if (c == '\"') { |
| 98 | if (tokens == NULL) { |
| 99 | return 0; |
| 100 | } |
| 101 | token = jsmn_alloc_token(parser, tokens, num_tokens); |
| 102 | if (token == NULL) { |
| 103 | parser->pos = start; |
| 104 | return JSMN_ERROR_NOMEM; |
| 105 | } |
| 106 | jsmn_fill_token(token, JSMN_STRING, start+1, parser->pos); |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 107 | #ifdef JSMN_PARENT_LINKS |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 108 | token->parent = parser->toksuper; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 109 | #endif |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 110 | return 0; |
| 111 | } |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 112 | |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 113 | /* Backslash: Quoted symbol expected */ |
| 114 | if (c == '\\' && parser->pos + 1 < len) { |
| 115 | int i; |
| 116 | parser->pos++; |
| 117 | switch (js[parser->pos]) { |
| 118 | /* Allowed escaped symbols */ |
| 119 | case '\"': case '/' : case '\\' : case 'b' : |
| 120 | case 'f' : case 'r' : case 'n' : case 't' : |
| 121 | break; |
| 122 | /* Allows escaped symbol \uXXXX */ |
| 123 | case 'u': |
| 124 | parser->pos++; |
| 125 | for(i = 0; i < 4 && parser->pos < len && js[parser->pos] != '\0'; i++) { |
| 126 | /* If it isn't a hex character we have an error */ |
| 127 | if(!((js[parser->pos] >= 48 && js[parser->pos] <= 57) || /* 0-9 */ |
| 128 | (js[parser->pos] >= 65 && js[parser->pos] <= 70) || /* A-F */ |
| 129 | (js[parser->pos] >= 97 && js[parser->pos] <= 102))) { /* a-f */ |
| 130 | parser->pos = start; |
| 131 | return JSMN_ERROR_INVAL; |
| 132 | } |
| 133 | parser->pos++; |
| 134 | } |
| 135 | parser->pos--; |
| 136 | break; |
| 137 | /* Unexpected symbol */ |
| 138 | default: |
| 139 | parser->pos = start; |
| 140 | return JSMN_ERROR_INVAL; |
| 141 | } |
| 142 | } |
| 143 | } |
| 144 | parser->pos = start; |
| 145 | return JSMN_ERROR_PART; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Parse JSON string and fill tokens. |
| 150 | */ |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 151 | int jsmn_parse(jsmn_parser *parser, const char *js, size_t len, |
| 152 | jsmntok_t *tokens, unsigned int num_tokens) { |
| 153 | int r; |
| 154 | int i; |
| 155 | jsmntok_t *token; |
| 156 | int count = parser->toknext; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 157 | |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 158 | for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) { |
| 159 | char c; |
| 160 | jsmntype_t type; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 161 | |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 162 | c = js[parser->pos]; |
| 163 | switch (c) { |
| 164 | case '{': case '[': |
| 165 | count++; |
| 166 | if (tokens == NULL) { |
| 167 | break; |
| 168 | } |
| 169 | token = jsmn_alloc_token(parser, tokens, num_tokens); |
| 170 | if (token == NULL) |
| 171 | return JSMN_ERROR_NOMEM; |
| 172 | if (parser->toksuper != -1) { |
| 173 | tokens[parser->toksuper].size++; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 174 | #ifdef JSMN_PARENT_LINKS |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 175 | token->parent = parser->toksuper; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 176 | #endif |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 177 | } |
| 178 | token->type = (c == '{' ? JSMN_OBJECT : JSMN_ARRAY); |
| 179 | token->start = parser->pos; |
| 180 | parser->toksuper = parser->toknext - 1; |
| 181 | break; |
| 182 | case '}': case ']': |
| 183 | if (tokens == NULL) |
| 184 | break; |
| 185 | type = (c == '}' ? JSMN_OBJECT : JSMN_ARRAY); |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 186 | #ifdef JSMN_PARENT_LINKS |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 187 | if (parser->toknext < 1) { |
| 188 | return JSMN_ERROR_INVAL; |
| 189 | } |
| 190 | token = &tokens[parser->toknext - 1]; |
| 191 | for (;;) { |
| 192 | if (token->start != -1 && token->end == -1) { |
| 193 | if (token->type != type) { |
| 194 | return JSMN_ERROR_INVAL; |
| 195 | } |
| 196 | token->end = parser->pos + 1; |
| 197 | parser->toksuper = token->parent; |
| 198 | break; |
| 199 | } |
| 200 | if (token->parent == -1) { |
| 201 | if(token->type != type || parser->toksuper == -1) { |
| 202 | return JSMN_ERROR_INVAL; |
| 203 | } |
| 204 | break; |
| 205 | } |
| 206 | token = &tokens[token->parent]; |
| 207 | } |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 208 | #else |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 209 | for (i = parser->toknext - 1; i >= 0; i--) { |
| 210 | token = &tokens[i]; |
| 211 | if (token->start != -1 && token->end == -1) { |
| 212 | if (token->type != type) { |
| 213 | return JSMN_ERROR_INVAL; |
| 214 | } |
| 215 | parser->toksuper = -1; |
| 216 | token->end = parser->pos + 1; |
| 217 | break; |
| 218 | } |
| 219 | } |
| 220 | /* Error if unmatched closing bracket */ |
| 221 | if (i == -1) return JSMN_ERROR_INVAL; |
| 222 | for (; i >= 0; i--) { |
| 223 | token = &tokens[i]; |
| 224 | if (token->start != -1 && token->end == -1) { |
| 225 | parser->toksuper = i; |
| 226 | break; |
| 227 | } |
| 228 | } |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 229 | #endif |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 230 | break; |
| 231 | case '\"': |
| 232 | r = jsmn_parse_string(parser, js, len, tokens, num_tokens); |
| 233 | if (r < 0) return r; |
| 234 | count++; |
| 235 | if (parser->toksuper != -1 && tokens != NULL) |
| 236 | tokens[parser->toksuper].size++; |
| 237 | break; |
| 238 | case '\t' : case '\r' : case '\n' : case ' ': |
| 239 | break; |
| 240 | case ':': |
| 241 | parser->toksuper = parser->toknext - 1; |
| 242 | break; |
| 243 | case ',': |
| 244 | if (tokens != NULL && parser->toksuper != -1 && |
| 245 | tokens[parser->toksuper].type != JSMN_ARRAY && |
| 246 | tokens[parser->toksuper].type != JSMN_OBJECT) { |
| 247 | #ifdef JSMN_PARENT_LINKS |
| 248 | parser->toksuper = tokens[parser->toksuper].parent; |
| 249 | #else |
| 250 | for (i = parser->toknext - 1; i >= 0; i--) { |
| 251 | if (tokens[i].type == JSMN_ARRAY || tokens[i].type == JSMN_OBJECT) { |
| 252 | if (tokens[i].start != -1 && tokens[i].end == -1) { |
| 253 | parser->toksuper = i; |
| 254 | break; |
| 255 | } |
| 256 | } |
| 257 | } |
| 258 | #endif |
| 259 | } |
| 260 | break; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 261 | #ifdef JSMN_STRICT |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 262 | /* In strict mode primitives are: numbers and booleans */ |
| 263 | case '-': case '0': case '1' : case '2': case '3' : case '4': |
| 264 | case '5': case '6': case '7' : case '8': case '9': |
| 265 | case 't': case 'f': case 'n' : |
| 266 | /* And they must not be keys of the object */ |
| 267 | if (tokens != NULL && parser->toksuper != -1) { |
| 268 | jsmntok_t *t = &tokens[parser->toksuper]; |
| 269 | if (t->type == JSMN_OBJECT || |
| 270 | (t->type == JSMN_STRING && t->size != 0)) { |
| 271 | return JSMN_ERROR_INVAL; |
| 272 | } |
| 273 | } |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 274 | #else |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 275 | /* In non-strict mode every unquoted value is a primitive */ |
| 276 | default: |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 277 | #endif |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 278 | r = jsmn_parse_primitive(parser, js, len, tokens, num_tokens); |
| 279 | if (r < 0) return r; |
| 280 | count++; |
| 281 | if (parser->toksuper != -1 && tokens != NULL) |
| 282 | tokens[parser->toksuper].size++; |
| 283 | break; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 284 | |
| 285 | #ifdef JSMN_STRICT |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 286 | /* Unexpected char in strict mode */ |
| 287 | default: |
| 288 | return JSMN_ERROR_INVAL; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 289 | #endif |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 290 | } |
| 291 | } |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 292 | |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 293 | if (tokens != NULL) { |
| 294 | for (i = parser->toknext - 1; i >= 0; i--) { |
| 295 | /* Unmatched opened object or array */ |
| 296 | if (tokens[i].start != -1 && tokens[i].end == -1) { |
| 297 | return JSMN_ERROR_PART; |
| 298 | } |
| 299 | } |
| 300 | } |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 301 | |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 302 | return count; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 303 | } |
| 304 | |
| 305 | /** |
| 306 | * Creates a new parser based over a given buffer with an array of tokens |
| 307 | * available. |
| 308 | */ |
| 309 | void jsmn_init(jsmn_parser *parser) { |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 310 | parser->pos = 0; |
| 311 | parser->toknext = 0; |
| 312 | parser->toksuper = -1; |
Edwin Wong | 27b5a35 | 2014-05-28 15:36:44 -0700 | [diff] [blame] | 313 | } |
Haibo Huang | 8e49843 | 2018-09-06 14:52:29 -0700 | [diff] [blame] | 314 | |