JSON parser.

#include "iot/json.h"
#include <string.h>
#include <stdio.h>
#include <errno.h>

Enumerations
enum	json_cmd { JSON_CMD_NONE = 0, JSON_CMD_ENTER_OBJECT, JSON_CMD_EXIT_OBJECT, JSON_CMD_ENTER_ARRAY, JSON_CMD_EXIT_ARRAY, JSON_CMD_NONE = 0, JSON_CMD_ENTER_OBJECT, JSON_CMD_EXIT_OBJECT, JSON_CMD_ENTER_ARRAY, JSON_CMD_EXIT_ARRAY, JSON_CMD_NONE = 0, JSON_CMD_ENTER_OBJECT, JSON_CMD_EXIT_OBJECT, JSON_CMD_ENTER_ARRAY, JSON_CMD_EXIT_ARRAY }

Functions
static void	_json_parse (char data, char ptr, enum json_cmd cmd, struct json_obj *out)

static char *	_json_read_token (char buffer, uint32_t buffer_size, char dest, uint32_t dest_size, enum json_cmd *cmd)
	is pair of name : value. More...

int	json_create (struct json_obj obj, const char data, int data_len)
	Create the JSON data from the string buffer. More...

int	json_find (struct json_obj obj, const char name, struct json_obj *out)
	Find data from the JSON object. More...

int	json_get_child (struct json_obj obj, int index, struct json_obj out)
	Get child data in the JSON object. More...

int	json_get_child_count (struct json_obj *obj)
	Get child count in the JSON object. More...

enum json_cmd

Enumerator
JSON_CMD_NONE
JSON_CMD_ENTER_OBJECT
JSON_CMD_EXIT_OBJECT
JSON_CMD_ENTER_ARRAY
JSON_CMD_EXIT_ARRAY
JSON_CMD_NONE
JSON_CMD_ENTER_OBJECT
JSON_CMD_EXIT_OBJECT
JSON_CMD_ENTER_ARRAY
JSON_CMD_EXIT_ARRAY
JSON_CMD_NONE
JSON_CMD_ENTER_OBJECT
JSON_CMD_EXIT_OBJECT
JSON_CMD_ENTER_ARRAY
JSON_CMD_EXIT_ARRAY

static void _json_parse	(	char *	data,
		char *	ptr,
		enum json_cmd	cmd,
		struct json_obj *	out
	)

static

References json_obj::b, json_obj::d, data, exponent, json_obj::i, i, JSON_CMD_ENTER_ARRAY, JSON_CMD_ENTER_OBJECT, JSON_MAX_NAME_SIZE, JSON_MAX_TOKEN_SIZE, JSON_TYPE_ARRAY, JSON_TYPE_BOOLEAN, JSON_TYPE_INTEGER, JSON_TYPE_NULL, JSON_TYPE_OBJECT, JSON_TYPE_REAL, JSON_TYPE_STRING, json_obj::name, json_obj::o, ptr, json_obj::s, json_obj::type, and json_obj::value.

Referenced by json_find(), and json_get_child().

static char* _json_read_token	(	char *	buffer,
		uint32_t	buffer_size,
		char *	dest,
		uint32_t	dest_size,
		enum json_cmd *	cmd
	)

static

is pair of name : value.

Parameters

buffer	: [in] Read out line
dest	: [out] destination buffer
cmd	: [out] 0 : none 1: enter object 2: exit object 3: enter array 4: exit array

Returns: : start point of next token

References buffer, JSON_CMD_ENTER_ARRAY, JSON_CMD_ENTER_OBJECT, JSON_CMD_EXIT_ARRAY, JSON_CMD_EXIT_OBJECT, JSON_CMD_NONE, and NULL.

Referenced by json_find(), json_get_child(), and json_get_child_count().

int json_create	(	struct json_obj *	obj,
		const char *	data,
		int	data_len
	)

Create the JSON data from the string buffer.

Parameters

[out]	obj	Pointer of JSON token which will be stored json informations.
[in]	data	JSON data represented as a string.
[in]	data_len	JSON data length.

Returns: 0 Success.; otherwise Failed to create.

Referenced by http_client_callback().

int json_find	(	struct json_obj *	obj,
		const char *	name,
		struct json_obj *	out
	)

Find data from the JSON object.

The input should be an object or array. This function supported colon separated search.

If JSON data is as follows {"obj1":{"data1":"value1","data2":"value2","obj2":{"data3":"value3"}}} You can be found value of data3 using the following name variable. "obj1:obj2:data3"

Parameters

[in]	obj	Pointer of the parent JSON data.
[in]	name	The name of the item you are looking for.
[in]	out	Pointer of JSON token which will be stored child JSON informations.

Returns: 0 Success.; otherwise Failed to create.

Referenced by http_client_callback().

int json_get_child	(	struct json_obj *	obj,
		int	index,
		struct json_obj *	out
	)

Get child data in the JSON object.

The input should be an object or array.

Parameters

[in]	obj	Pointer of the parent JSON data.
[in]	index	Index which is located in the parent object.
[in]	out	Pointer of JSON token which will be stored child JSON informations.

Returns: 0 Success.; otherwise Failed to create.

int json_get_child_count ( struct json_obj * obj )

Get child count in the JSON object.

The input should be an object or array.

Parameters

[in] obj Pointer of the parent JSON data.

Returns: 0 Success.; otherwise Failed to create.

Microchip® Advanced Software Framework

Enumerations

Functions