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#include "json.h"
#include <assert.h>
#include <ctype.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "json.h"
#include "string.h"
#include "types.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;
}
JSON JSON_integer(i32 value) {
JSON json = {0};
json.type = JSON_INTEGER;
json.as.integer = value;
return json;
}
JSON JSON_float(f32 value) {
JSON json = {0};
json.type = JSON_FLOAT;
json.as.floating = value;
return json;
}
JSON JSON_array(Vec items) {
JSON json = {0};
json.type = JSON_ARRAY;
json.as.array = items;
return json;
}
JSON JSON_string(Str value) {
JSON json = {0};
json.type = JSON_STRING;
json.as.string = value;
return json;
}
JSON JSON_object(size len, Vec keys, Vec values) {
assert(len == keys.len && len == values.len);
JSON json = {0};
json.type = JSON_OBJECT;
json.as.object.len = len;
json.as.object.keys = keys;
json.as.object.values = values;
return json;
}
JSON JSON_boolean(bool value) {
JSON json = {0};
json.type = JSON_BOOL;
json.as.boolean = value;
return json;
}
JSON JSON_null() {
JSON json = {0};
json.type = JSON_NULL;
return json;
}
i32 JSON_fprint(FILE *w, JSON json) {
switch (json.type) {
case JSON_STRING:
fprintf(w, "\"");
Str_fprint(w, json.as.string);
return fprintf(w, "\"");
case JSON_INTEGER:
return fprintf(w, "%d", json.as.integer);
case JSON_FLOAT:
return fprintf(w, "%f", json.as.floating);
case JSON_NULL:
return fprintf(w, "null");
case JSON_BOOL:
return fprintf(w, "%s", json.as.boolean ? "true" : "false");
case JSON_ARRAY:
fprintf(w, "[");
for (size i = 0; i < json.as.array.len; i++) {
JSON value = *Vec_get(json.as.array, JSON, i);
JSON_fprint(w, value);
if (i < json.as.array.len - 1) fprintf(w, ", ");
}
fprintf(w, "]");
return 0;
case JSON_OBJECT:
fprintf(w, "{");
for (size i = 0; i < json.as.object.len; i++) {
Str key = *Vec_get(json.as.object.keys, Str, i);
fprintf(w, "\"");
Str_fprint(w, key);
fprintf(w, "\": ");
JSON value = *Vec_get(json.as.object.values, JSON, i);
JSON_fprint(w, value);
if (i < json.as.object.len - 1) fprintf(w, ", ");
}
fprintf(w, "}");
return 0;
}
assert(false);
}
typedef struct {
JSON value;
uptr pos;
} parse_result;
parse_result parse_any(Arena *a, byte *src, uptr pos);
parse_result parse_number(byte *src, uptr start_pos) {
parse_result result = {0};
result.pos = start_pos;
i32 integer = 0;
while (isdigit(src[result.pos])) {
integer = integer * 10 + (src[result.pos] - '0');
result.pos++;
}
if (src[result.pos] != '.') {
result.value = JSON_integer(integer);
return result;
}
result.pos++;
f32 fractional_part = 0.0;
f32 decimal_place = 0.1;
while (isdigit(src[result.pos])) {
fractional_part += (src[result.pos] - '0') * decimal_place;
decimal_place *= 0.1;
result.pos++;
}
result.value = JSON_float((f32)integer + fractional_part);
return result;
}
uptr absorb_whitespaces(byte *src, uptr start_pos) {
uptr pos = start_pos;
while (isspace(src[pos])) {
pos++;
}
return pos;
}
parse_result parse_array(Arena *a, byte *src, uptr start_pos) {
assert(src[start_pos] == '[');
parse_result result = {0};
result.pos = start_pos + 1;
if (src[result.pos] == ']') {
result.pos++;
return result;
}
Vec items = Vec_new(a, JSON, 2);
for (;;) {
result.pos = absorb_whitespaces(src, result.pos);
parse_result item_result = parse_any(a, src, result.pos);
Vec_push(a, &items, &item_result.value);
result.pos = absorb_whitespaces(src, item_result.pos);
if (src[result.pos] == ',') {
result.pos++;
} else {
break;
}
};
assert(src[result.pos] == ']');
result.pos++;
result.value = JSON_array(items);
return result;
}
parse_result parse_string(Arena *a, byte *src, uptr start_pos) {
assert(src[start_pos] == '"');
parse_result result = {0};
result.pos = start_pos + 1;
while (src[result.pos] != '"' && src[result.pos - 1] != '\\') {
result.pos++;
}
assert(src[result.pos] == '"');
result.value = JSON_string(
Str_copy(a, &src[start_pos + 1], result.pos - start_pos - 1));
result.pos++;
return result;
}
parse_result parse_object(Arena *a, byte *src, uptr start_pos) {
assert(src[start_pos] == '{');
parse_result result = {0};
result.pos = absorb_whitespaces(src, start_pos + 1);
size len = 0;
Vec keys = Vec_new(a, Str, 2);
Vec values = Vec_new(a, JSON, 2);
if (src[result.pos] == '}') {
result.pos++;
result.value = JSON_object(len, keys, values);
return result;
}
for (;;) {
assert(src[result.pos] == '"');
parse_result key_result = parse_string(a, src, result.pos);
result.pos = absorb_whitespaces(src, key_result.pos);
assert(src[result.pos] == ':');
result.pos = absorb_whitespaces(src, result.pos + 1);
parse_result value_result = parse_any(a, src, result.pos);
len++;
assert(key_result.value.type == JSON_STRING);
Vec_push(a, &keys, &key_result.value.as.string);
Vec_push(a, &values, &value_result.value);
result.pos = absorb_whitespaces(src, value_result.pos);
if (src[result.pos] != ',') {
break;
}
result.pos = absorb_whitespaces(src, result.pos + 1);
}
assert(src[result.pos] == '}');
result.pos++;
result.value = JSON_object(len, keys, values);
return result;
}
parse_result parse_any(Arena *a, byte *src, uptr pos) {
pos = absorb_whitespaces(src, pos);
if (isdigit(src[pos])) return parse_number(src, pos);
if (src[pos] == '[') return parse_array(a, src, pos);
if (src[pos] == '"') return parse_string(a, src, pos);
if (src[pos] == '{') return parse_object(a, src, pos);
if (memcmp(src + pos, "true", 4) == 0) {
parse_result result = {0};
result.value = JSON_boolean(true);
result.pos = pos + 4;
return result;
}
if (memcmp(src + pos, "false", 5) == 0) {
parse_result result = {0};
result.value = JSON_boolean(false);
result.pos = pos + 5;
return result;
}
if (memcmp(src + pos, "null", 4) == 0) {
parse_result result = {0};
result.value = JSON_null();
result.pos = pos + 4;
return result;
}
assert(false);
}
JSON JSON_parse(Arena *a, byte *src) { return parse_any(a, src, 0).value; }
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);
}
}
assert(false);
}
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