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#include "json.h"
#include <assert.h>
#include <ctype.h>
#include <math.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include "json.h"
#include "string.h"
JSONObject *JSONObject_new(Arena *a) {
JSONObject *object = new(a, JSONObject, 1);
object->len = 0;
object->keys = *Vec_new(a, Str, 2);
object->values = *Vec_new(a, JSON, 2);
return object;
}
int JSON_fprint(FILE *w, JSON json) {
if (json.string != 0)
return Str_fprint(w, *json.string);
if (json.integer != 0)
return fprintf(w, "%d", *json.integer);
if (json.object != 0) {
fprintf(w, "{");
for (size i = 0; i < json.object->len; i++) {
Str key = *Vec_get(&json.object->keys, Str, i);
Str_fprint(w, key);
fprintf(w, ": ");
JSON value = *Vec_get(&json.object->values, JSON, i);
JSON_fprint(w, value);
if (i < json.object->len - 1)
fprintf(w, ", ");
}
fprintf(w, "}");
return 0;
}
if (json.array != 0) {
fprintf(w, "[");
for (size i = 0; i < json.array->len; i++) {
JSON value = *Vec_get(json.array, JSON, i);
JSON_fprint(w, value);
if (i < json.array->len - 1)
fprintf(w, ", ");
}
fprintf(w, "]");
return 0;
}
return fprintf(w, "null");
}
typedef struct {
JSON *value;
uptr pos;
} parse_any_result;
parse_any_result parse_any(Arena *a, byte *src, uptr pos);
typedef struct {
int *value;
uptr pos;
} parse_integer_result;
parse_integer_result parse_integer(Arena *a, byte *src, uptr start_pos) {
byte ints[16];
int i = 0;
while (isdigit(src[start_pos + i])) {
int val = (src[start_pos + i] - '0');
ints[i] = val;
i++;
}
int *result = new(a, int, 1);
for (int j = 0; j < i; j++) {
*result += ints[j] * pow(10, (i - j - 1));
}
return (parse_integer_result){result, start_pos + i};
}
uptr absorb_whitespaces(byte *src, uptr start_pos) {
uptr pos = start_pos;
while (isspace(src[pos])) {
pos++;
}
return pos;
}
typedef struct {
Vec *items; // Vec<JSON>
uptr pos;
} parse_array_result;
parse_array_result parse_array(Arena *a, byte *src, uptr start_pos) {
assert(src[start_pos] == '[');
parse_array_result result = {0};
result.pos = start_pos + 1;
result.items = Vec_new(a, JSON, 2);
if (src[result.pos] == ']') {
result.pos++;
return result;
}
for (;;) {
result.pos = absorb_whitespaces(src, result.pos);
parse_any_result any_result = parse_any(a, src, result.pos);
Vec_push(a, result.items, any_result.value);
result.pos = absorb_whitespaces(src, any_result.pos);
if (src[result.pos] == ',') {
result.pos++;
} else {
break;
}
};
assert(src[result.pos] == ']');
result.pos++;
return result;
}
typedef struct {
Str *string;
uptr pos;
} parse_string_result;
parse_string_result parse_string(Arena *a, byte *src, uptr start_pos) {
assert(src[start_pos] == '"');
parse_string_result result = {.pos = start_pos + 1};
while (src[result.pos] != '"' && src[result.pos - 1] != '\\') {
result.pos++;
}
assert(src[result.pos] == '"');
result.string =
Str_copy(a, &src[start_pos + 1], result.pos - start_pos - 1);
result.pos++;
return result;
}
typedef struct {
JSONObject *object;
uptr pos;
} parse_object_result;
parse_object_result parse_object(Arena *a, byte *src, uptr start_pos) {
assert(src[start_pos] == '{');
parse_object_result result = {.pos = start_pos + 1};
result.object = JSONObject_new(a);
start_pos = absorb_whitespaces(src, start_pos + 1);
if (src[start_pos] == '}') {
result.pos = start_pos + 1;
return result;
}
for (;;) {
assert(src[start_pos] == '"');
parse_string_result str_result = parse_string(a, src, start_pos);
Str *key = str_result.string;
start_pos = absorb_whitespaces(src, str_result.pos);
assert(src[start_pos] == ':');
start_pos = absorb_whitespaces(src, start_pos + 1);
parse_any_result any_result = parse_any(a, src, start_pos);
result.object->len++;
Vec_push(a, &result.object->keys, key);
Vec_push(a, &result.object->values, any_result.value);
start_pos = absorb_whitespaces(src, any_result.pos);
if (src[start_pos] != ',') {
break;
}
start_pos = absorb_whitespaces(src, start_pos + 1);
}
assert(src[start_pos] == '}');
result.pos = start_pos + 1;
return result;
}
parse_any_result parse_any(Arena *a, byte *src, uptr start_pos) {
parse_any_result result = {.pos = start_pos};
result.value = new(a, JSON, 1);
if (isdigit(src[result.pos])) {
parse_integer_result int_result = parse_integer(a, src, result.pos);
result.value->integer = int_result.value;
result.pos = int_result.pos;
} else if (src[result.pos] == '[') {
parse_array_result array_result = parse_array(a, src, result.pos);
result.value->array = array_result.items;
result.pos = array_result.pos;
} else if (src[result.pos] == '"') {
parse_string_result string_result = parse_string(a, src, result.pos);
result.value->string = string_result.string;
result.pos = string_result.pos;
} else if (src[result.pos] == '{') {
parse_object_result object_result = parse_object(a, src, result.pos);
result.value->object = object_result.object;
result.pos = object_result.pos;
}
return result;
}
JSON JSON_parse(Arena *a, byte *src) {
parse_any_result result = parse_any(a, src, 0);
return *result.value;
}
JSON JSON_Int(Arena *a, int val) {
JSON json = {0};
json.integer = new(a, int, 1);
*json.integer = val;
return json;
}
JSON *JSONObject_get(JSONObject *obj, Str key) {
for (size i = 0; i < obj->len; i++) {
if (Str_equals(*Vec_get(&obj->keys, Str, i), key)) {
return Vec_get(&obj->values, JSON, i);
}
}
return 0;
}
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