jsmn.h

/*
  https://github.com/zserge/jsmn
 
  Copyright (c) 2010 Serge A. Zaitsev
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.
 */

#ifndef __JSMN_H_
#define __JSMN_H_

#include <stddef.h>

#define JSMN_PARENT_LINKS

#ifdef __cplusplus
extern "C" {
#endif

/**
 * JSON type identifier. Basic types are:
 *   o Object
 *  o Array
 *  o String
 *  o Other primitive: number, boolean (true/false) or null
 */
typedef enum {
    JSMN_UNDEFINED = 0,
    JSMN_OBJECT = 1,
    JSMN_ARRAY = 2,
    JSMN_STRING = 3,
    JSMN_PRIMITIVE = 4
} jsmntype_t;

enum jsmnerr {
    /* Not enough tokens were provided */
            JSMN_ERROR_NOMEM = -1,
    /* Invalid character inside JSON string */
            JSMN_ERROR_INVAL = -2,
    /* The string is not a full JSON packet, more bytes expected */
            JSMN_ERROR_PART = -3
};

/**
 * JSON token description.
 * type   type (object, array, string etc.)
 * start  start position in JSON data string
 * end    end position in JSON data string
 */
typedef struct {
    jsmntype_t type;
    int start;
    int end;
    int size;
#ifdef JSMN_PARENT_LINKS
    int parent;
#endif
} jsmntok_t;

/**
 * JSON parser. Contains an array of token blocks available. Also stores
 * the string being parsed now and current position in that string
 */
typedef struct {
    unsigned int pos; /* offset in the JSON string */
    unsigned int toknext; /* next token to allocate */
    int toksuper; /* superior token node, e.g parent object or array */
} jsmn_parser;

/**
 * Create JSON parser over an array of tokens
 */
void jsmn_init(jsmn_parser *parser);

/**
 * Run JSON parser. It parses a JSON data string into and array of tokens, each describing
 * a single JSON object.
 */
int jsmn_parse(jsmn_parser *parser, const char *js, size_t len,
               jsmntok_t *tokens, unsigned int num_tokens);

#ifdef __cplusplus
}
#endif

#endif /* __JSMN_H_ */