Viewing file:  json_parser.h (2.68 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* File: json_parser.h
*
* The data routines and data structures here constitue a very
* simple parser that will parse a JSON string into a tree of
* of structs, each struct representing an fundamental JSON type.
*
*/
#ifndef __JSON_PARSER_H__
#define __JSON_PARSER_H__
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
/*
* JSON Types.
*
* This enum is used to identify the primative JSON
* type represented by a JSON_Value_t
*/
typedef enum
{
JSON_TYPE_NULL,
JSON_TYPE_STRING,
JSON_TYPE_NUMBER,
JSON_TYPE_BOOL,
JSON_TYPE_OBJECT,
JSON_TYPE_ARRAY,
JSON_TYPE_ERROR
}JSON_Type;
struct JSON_Object;
struct JSON_Array;
/*
* A JSON Value.
*
* A JSON value can be an object, an array, a string, a number, a boolean
* or a NULL. This structure wraps all of those into a union.
*/
typedef struct
{
JSON_Type type; /* Indicates the type of value */
union {
char *string; /* The value of a string */
float number; /* The value of a number */
struct JSON_Object *obj; /* The value of a object */
struct JSON_Array *array; /* The value of a array */
} u;
}JSON_Value_t;
/*
* A JSON Pair.
*
* A Pair is a name-value structure. It is not actally a JSON type
* but rather is a constituent of an JSON_Object_t
*/
typedef struct
{
char *name; /* The name field. */
JSON_Value_t *value; /* The value field. */
}JSON_Pair_t;
/*
* A JSON Object.
*
* An object is implelemented as a array of N-V Pairs
*/
typedef struct JSON_Object
{
JSON_Pair_t **pairs; /* The Array of Pairs */
size_t num_pairs; /* The size of the Array */
}JSON_Object_t;
/*
* A JSON Array.
*
* An Array is implemented as a list of values.
*/
typedef struct JSON_Array
{
JSON_Value_t **values; /* The array of values */
size_t num_values; /* The size of the Array */
}JSON_Array_t;
/*
* Parse a string into a JSON Object.
*/
JSON_Object_t *ParseJSONObject(char **strptr);
/*
* Free a JSON Object.
*/
void FreeJSONObject(JSON_Object_t *obj);
/*
* Format and output a JSON object.
*/
void DisplayJSONObject(FILE *f, JSON_Object_t *obj);
/*
* Format and output a JSON value.
*/
void DisplayJSONValue(FILE* f, JSON_Value_t *v);
/*
* Find a specific value in an object.
*/
JSON_Value_t *Find(JSON_Object_t *obj, char *name);
/*
* Return a specified JSON pair from an object.
*/
JSON_Pair_t *GetPairFromObject(JSON_Object_t *obj, unsigned idx);
/*
* Return a specified JSON value from an array.
*/
JSON_Value_t *GetValueFromArray(JSON_Array_t *arr, unsigned idx);
#endif // __JSON_PARSER_H__
|