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4 months ago
11
Immediate Mode JSON Serialization Library in C. Similar to imgui but for generating JSON.
#include <stdio.h>
#define JIM_IMPLEMENTATION
#include "./jim.h"
int main()
{
Jim jim = {
.sink = stdout,
.write = (Jim_Write) fwrite,
};
jim_object_begin(&jim);
jim_member_key(&jim, "null");
jim_null(&jim);
jim_member_key(&jim, "bool");
jim_array_begin(&jim);
jim_bool(&jim, 0);
jim_bool(&jim, 1);
jim_array_end(&jim);
jim_member_key(&jim, "integers");
jim_array_begin(&jim);
for (int i = -3; i <= 3; ++i) {
jim_integer(&jim, i);
}
jim_array_end(&jim);
jim_member_key(&jim, "floats");
jim_array_begin(&jim);
jim_float(&jim, 0.0, 4);
jim_float(&jim, -0.0, 4);
jim_float(&jim, 3.1415, 4);
jim_float(&jim, 2.71828, 5);
jim_float(&jim, 1.6180, 4);
jim_float(&jim, 0.0 / 0.0, 4);
jim_float(&jim, 1.0 / 0.0, 4);
jim_float(&jim, -1.0 / 0.0, 4);
jim_array_end(&jim);
jim_member_key(&jim, "string");
jim_array_begin(&jim);
jim_string(&jim, "Hello\tWorld\n");
jim_string_sized(&jim, "\0\0\0\0", 4);
jim_array_end(&jim);
jim_object_end(&jim);
if (jim.error != JIM_OK) {
fprintf(stderr, "ERROR: could not serialize json properly: %s\n",
jim_error_string(jim.error));
return -1;
}
return 0;
}
$ cc -o example example.c
$ ./example | jq .
{
"null": null,
"bool": [
false,
true
],
"integers": [
-3,
-2,
-1,
0,
1,
2,
3
],
"floats": [
3.1415,
2.71828,
1.618
],
"string": [
"Hello\tWorld\n",
"\u0000\u0000\u0000\u0000"
]
}
The expected outputs of the test cases are stored in ./test_expected.h. To regenerate it just run:
- Does not depends on libc. Could be theoretically used in embedded, but I know nothing about embedded, so maybe not.
- jim_float() is quite likely very stupid and imprecise
