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/* JSON parsing examples */
#include "res_htjson.h"
#include <draw2d/draw2dall.h>
#include <encode/json.h>
/*---------------------------------------------------------------------------*/
/* C structs that map a Json object */
typedef struct _product_t Product;
typedef struct _products_t Products;
struct _product_t
{
String *description;
real32_t price;
};
struct _products_t
{
uint32_t size;
ArrSt(Product) *data;
};
DeclSt(Product);
/*---------------------------------------------------------------------------*/
static Stream *i_stm_from_json(const char_t *json_data)
{
return stm_from_block(cast_const(json_data, byte_t), str_len_c(json_data));
}
/*---------------------------------------------------------------------------*/
int main(int argc, char *argv[])
{
unref(argc);
unref(argv);
draw2d_start();
/* Parsing a Json boolean */
{
Stream *stm = i_stm_from_json("true");
bool_t *json = json_read(stm, NULL, bool_t);
bstd_printf("bool_t from Json: %d\n", *json);
json_destroy(&json, bool_t);
stm_close(&stm);
}
/* Parsing a Json unsigned int */
{
Stream *stm = i_stm_from_json("6654");
uint16_t *json = json_read(stm, NULL, uint16_t);
bstd_printf("uint16_t from Json: %d\n", *json);
json_destroy(&json, uint16_t);
stm_close(&stm);
}
/* Parsing a Json signed int */
{
Stream *stm = i_stm_from_json("-567");
int16_t *json = json_read(stm, NULL, int16_t);
bstd_printf("int16_t from Json: %d\n", *json);
json_destroy(&json, int16_t);
stm_close(&stm);
}
/* Parsing a Json real */
{
Stream *stm = i_stm_from_json("456.45");
real32_t *json = json_read(stm, NULL, real32_t);
bstd_printf("real32_t from Json: %.3f\n", *json);
json_destroy(&json, real32_t);
stm_close(&stm);
}
/* Parsing a Json string */
{
Stream *stm = i_stm_from_json("\"Hello World\"");
String *json = json_read(stm, NULL, String);
bstd_printf("String from Json: %s\n", tc(json));
json_destroy(&json, String);
stm_close(&stm);
}
/* Parsing a Json b64 encoded image */
{
uint32_t size;
ResPack *pack = res_htjson_respack("");
const byte_t *data = respack_file(pack, JSON_B64_IMAGE_TXT, &size);
Stream *stm = stm_from_block(data, size);
Image *json = json_read(stm, NULL, Image);
uint32_t width = image_width(json);
uint32_t height = image_height(json);
bstd_printf("Image from Json: width: %d height: %d\n", width, height);
json_destroy(&json, Image);
stm_close(&stm);
respack_destroy(&pack);
}
/* Parsing a Json int array */
{
Stream *stm = i_stm_from_json("[ -321, 12, -8943, 228, -220, 347 ]");
ArrSt(int16_t) *json = json_read(stm, NULL, ArrSt(int16_t));
bstd_printf("ArrSt(int16_t) from Json: ");
arrst_foreach(id, json, int16_t)
bstd_printf("%d ", *id);
arrst_end()
bstd_printf("\n");
json_destroy(&json, ArrSt(int16_t));
stm_close(&stm);
}
/* Parsing a Json String array */
{
Stream *stm = i_stm_from_json("[ \"Red\", \"Green\", \"Blue\", \"Yellow\", \"Orange\" ]");
ArrPt(String) *json = json_read(stm, NULL, ArrPt(String));
bstd_printf("ArrPt(String) from Json: ");
arrpt_foreach(str, json, String)
bstd_printf("%s ", tc(str));
arrpt_end()
bstd_printf("\n");
json_destroy(&json, ArrPt(String));
stm_close(&stm);
}
/* Data binding (only once time in application) */
/* This allows the Json parser to know the structure of the objects */
dbind(Product, String *, description);
dbind(Product, real32_t, price);
dbind(Products, uint32_t, size);
dbind(Products, ArrSt(Product) *, data);
/* Parsing a Json object */
{
static const char_t *JSON_OBJECT = "\
{\
\"size\" : 3,\
\"data\" : [\
{\
\"description\" : \"Intel i7-7700K\",\
\"price\" : 329.99\
},\
{\
\"description\" : \"Ryzen-5-1600\",\
\"price\" : 194.99\
},\
{\
\"description\" : \"GTX-1060\",\
\"price\" : 449.99\
}\
]\
}";
Stream *stm = i_stm_from_json(JSON_OBJECT);
Products *json = json_read(stm, NULL, Products);
bstd_printf("Products object from Json: size %d\n", json->size);
arrst_foreach(elem, json->data, Product)
bstd_printf(" Product: %s Price %.2f\n", tc(elem->description), elem->price);
arrst_end()
bstd_printf("\n");
json_destroy(&json, Products);
stm_close(&stm);
}
/* Writting data/objects to JSon */
{
Stream *stm = stm_memory(1024);
/* Write boolean as Json */
{
bool_t data_bool = TRUE;
stm_writef(stm, "Json from bool_t: ");
json_write(stm, &data_bool, NULL, bool_t);
stm_writef(stm, "\n");
}
/* Write unsigned integer as Json */
{
uint16_t data_uint = 6654;
stm_writef(stm, "Json from uint16_t: ");
json_write(stm, &data_uint, NULL, uint16_t);
stm_writef(stm, "\n");
}
/* Write integer as Json */
{
int16_t data_int = -567;
stm_writef(stm, "Json from int16_t: ");
json_write(stm, &data_int, NULL, int16_t);
stm_writef(stm, "\n");
}
/* Write real32_t as Json */
{
real32_t data_real = 456.45f;
stm_writef(stm, "Json from real32_t: ");
json_write(stm, &data_real, NULL, real32_t);
stm_writef(stm, "\n");
}
/* Write String as Json */
{
String *data_str = str_c("Hello World");
stm_writef(stm, "Json from String: ");
json_write(stm, data_str, NULL, String);
stm_writef(stm, "\n");
str_destroy(&data_str);
}
/* Write Image as Json (string b64) */
{
Pixbuf *pixbuf = pixbuf_create(2, 2, ekGRAY8);
Image *data_image = NULL;
bmem_set1(pixbuf_data(pixbuf), 2 * 2, 128);
data_image = image_from_pixbuf(pixbuf, NULL);
stm_writef(stm, "Json from Image: ");
json_write(stm, data_image, NULL, Image);
stm_writef(stm, "\n");
pixbuf_destroy(&pixbuf);
image_destroy(&data_image);
}
/* Write int array as Json */
{
ArrSt(int16_t) *array = arrst_create(int16_t);
arrst_append(array, -321, int16_t);
arrst_append(array, 12, int16_t);
arrst_append(array, -8943, int16_t);
arrst_append(array, 228, int16_t);
arrst_append(array, -220, int16_t);
arrst_append(array, 347, int16_t);
stm_writef(stm, "Json from int array: ");
json_write(stm, array, NULL, ArrSt(int16_t));
stm_writef(stm, "\n");
arrst_destroy(&array, NULL, int16_t);
}
/* Write string array as Json */
{
ArrPt(String) *array = arrpt_create(String);
arrpt_append(array, str_c("Red"), String);
arrpt_append(array, str_c("Green"), String);
arrpt_append(array, str_c("Blue"), String);
arrpt_append(array, str_c("Yellow"), String);
arrpt_append(array, str_c("Orange"), String);
stm_writef(stm, "Json from string array: ");
json_write(stm, array, NULL, ArrPt(String));
stm_writef(stm, "\n");
arrpt_destroy(&array, str_destroy, String);
}
/* Write object as Json */
{
Products *products = heap_new(Products);
products->size = 3;
products->data = arrst_create(Product);
{
Product *product = arrst_new(products->data, Product);
product->description = str_c("Intel i7-7700K");
product->price = 329.99f;
}
{
Product *product = arrst_new(products->data, Product);
product->description = str_c("Ryzen-5-1600");
product->price = 194.99f;
}
{
Product *product = arrst_new(products->data, Product);
product->description = str_c("GTX-1060");
product->price = 449.99f;
}
stm_writef(stm, "Json from object: ");
json_write(stm, products, NULL, Products);
stm_writef(stm, "\n");
dbind_destroy(&products, Products);
}
{
String *str = stm_str(stm);
bstd_printf("%s\n", tc(str));
str_destroy(&str);
}
stm_close(&stm);
}
draw2d_finish();
return 0;
}
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