1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
#include "json.h"
#include <assert.h>
#include <ctype.h>
#include <math.h>
#include <stdint.h>
#include <stdio.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));
}
printf("json.parse_integer: parsed int=%d at pos=%lu\n", *result, pos);
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;
uintptr_t pos;
} parse_array_result;
parse_array_result parse_array(Arena *a, char *src, uintptr_t pos) {
printf("json.parse_array: parsing array %s\n", src + 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) {
printf("json.parse_string: %s\n", src + 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};
}
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;
}
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;
}
|
