1 /* 2 Copyright (c) 2010 Serge A. Zaitsev 3 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: 10 11 The above copyright notice and this permission notice shall be included in 12 all copies or substantial portions of the Software. 13 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 20 THE SOFTWARE.* 21 */ 22 #ifndef __JSMN_H_ 23 #define __JSMN_H_ 24 25 #include <stddef.h> 26 27 #ifdef __cplusplus 28 extern "C" { 29 #endif 30 31 /** 32 * JSON type identifier. Basic types are: 33 * o Object 34 * o Array 35 * o String 36 * o Other primitive: number, boolean (true/false) or null 37 */ 38 typedef enum { 39 JSMN_UNDEFINED = 0, 40 JSMN_OBJECT = 1, 41 JSMN_ARRAY = 2, 42 JSMN_STRING = 3, 43 JSMN_PRIMITIVE = 4 44 } jsmntype_t; 45 46 enum jsmnerr { 47 /* Not enough tokens were provided */ 48 JSMN_ERROR_NOMEM = -1, 49 /* Invalid character inside JSON string */ 50 JSMN_ERROR_INVAL = -2, 51 /* The string is not a full JSON packet, more bytes expected */ 52 JSMN_ERROR_PART = -3 53 }; 54 55 /** 56 * JSON token description. 57 * @param type type (object, array, string etc.) 58 * @param start start position in JSON data string 59 * @param end end position in JSON data string 60 */ 61 typedef struct { 62 jsmntype_t type; 63 int start; 64 int end; 65 int size; 66 #ifdef JSMN_PARENT_LINKS 67 int parent; 68 #endif 69 } jsmntok_t; 70 71 /** 72 * JSON parser. Contains an array of token blocks available. Also stores 73 * the string being parsed now and current position in that string 74 */ 75 typedef struct { 76 unsigned int pos; /* offset in the JSON string */ 77 unsigned int toknext; /* next token to allocate */ 78 int toksuper; /* superior token node, e.g parent object or array */ 79 } jsmn_parser; 80 81 /** 82 * Create JSON parser over an array of tokens 83 */ 84 void jsmn_init(jsmn_parser *parser); 85 86 /** 87 * Run JSON parser. It parses a JSON data string into and array of tokens, each describing 88 * a single JSON object. 89 */ 90 int jsmn_parse(jsmn_parser *parser, const char *js, size_t len, 91 jsmntok_t *tokens, unsigned int num_tokens); 92 93 #ifdef __cplusplus 94 } 95 #endif 96 97 #endif /* __JSMN_H_ */ 98