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#include "json.h"
#include <assert.h>
#include <ctype.h>
#include <math.h>
#include <stddef.h>
#include <stdint.h>
#include "string.h"
typedef struct {
JSON *value;
uintptr_t pos;
} parse_any_result;
parse_any_result parse_any(Arena *a, char *src, uintptr_t pos);
typedef struct {
int *value;
uintptr_t pos;
} parse_integer_result;
parse_integer_result parse_integer(Arena *a, char *src, uintptr_t pos) {
char ints[16];
int i = 0;
while (isdigit(src[pos + i])) {
int val = (src[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, pos + i};
}
uintptr_t absorb_whitespaces(char *src, uintptr_t pos) {
int i = 0;
while (isspace(src[pos + i])) {
i++;
}
return pos + i;
}
typedef struct {
Vec *items; // Vec<JSON>
uintptr_t pos;
} parse_array_result;
parse_array_result parse_array(Arena *a, char *src, uintptr_t pos) {
assert(src[pos] == '[');
pos++;
Vec items = Vec_new(a, JSON, 2);
for (;;) {
pos = absorb_whitespaces(src, pos);
parse_any_result result = parse_any(a, src, pos);
Vec_push(a, &items, result.value);
pos = result.pos;
pos = absorb_whitespaces(src, pos);
if (src[pos] == ',') {
pos++;
} else {
break;
}
};
assert(src[pos] == ']');
return (parse_array_result){&items, pos + 1};
}
typedef struct {
Str *string;
uintptr_t pos;
} parse_string_result;
parse_string_result parse_string(Arena *a, char *src, uintptr_t pos) {
assert(src[pos] == '"');
int i = 1;
while (src[pos + i] != '"' && src[pos + i - 1] != '\\') {
i++;
}
assert(src[pos + i] == '"');
Str* s = Str_copy(a, &src[pos + 1], i - 1);
return (parse_string_result){s, pos + i + 1};
}
typedef struct {
JSONObject *object;
uintptr_t pos;
} parse_object_result;
parse_object_result parse_object(Arena *a, char *src, uintptr_t pos) {
assert(src[pos] == '{');
JSONObject *object = new(a, JSONObject, 1);
object->len = 0;
object->keys = Vec_new(a, Str, 2);
object->values = Vec_new(a, JSON, 2);
pos = absorb_whitespaces(src, pos + 1);
if (src[pos] == '}') {
return (parse_object_result){object, pos + 1};
}
for (;;) {
assert(src[pos] == '"');
parse_string_result str_result = parse_string(a, src, pos);
Str *key = str_result.string;
pos = absorb_whitespaces(src, str_result.pos);
assert(src[pos] == ':');
pos = absorb_whitespaces(src, pos+1);
parse_any_result any_result = parse_any(a, src, pos);
object->len++;
Vec_push(a, &object->keys, key);
Vec_push(a, &object->values, any_result.value);
pos = absorb_whitespaces(src, any_result.pos);
if (src[pos] != ',') {break;}
pos = absorb_whitespaces(src, pos +1);
}
assert(src[pos] == '}');
return (parse_object_result){object, pos+1};
}
parse_any_result parse_any(Arena *a, char *src, uintptr_t pos) {
JSON *value = new (a, JSON, 1);
if (isdigit(src[pos])) {
parse_integer_result result = parse_integer(a, src, pos);
value->integer = result.value;
pos = result.pos;
} else if (src[pos] == '[') {
parse_array_result result = parse_array(a, src, pos);
value->array = result.items;
pos = result.pos;
} else if (src[pos] == '"') {
parse_string_result result = parse_string(a, src, pos);
value->string = result.string;
pos = result.pos;
} else if (src[pos] == '{') {
parse_object_result result = parse_object(a, src, pos);
value->object = result.object;
pos = result.pos;
}
return (parse_any_result){value, pos};
}
JSON JSON_parse(Arena *a, char *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 (ptrdiff_t i = 0; i < obj->len; i++) {
if (Str_equals(*Vec_get(&obj->keys, Str, i), key)) {
return Vec_get(&obj->values, JSON, i);
}
}
return NULL;
}
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