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
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
#include <stdlib.h>
#include <stdio.h>
#include "jsmn.h"
enum {
JSON_SKIP = 0,
JSON_OPEN = 1,
JSON_CLOSE = 2,
JSON_BARE = 3,
JSON_UNBARE = 4,
JSON_QUOTE = 5,
JSON_UNQUOTE = 6,
JSON_ERROR = 7
};
#define JSON_SYM_SKIP(sym) \
[sym] = JSON_SKIP
#define JSON_SYM_ERROR(sym) \
[sym] = JSON_ERROR
#define JSON_SYM_OPEN(sym) \
[sym] = JSON_OPEN
#define JSON_SYM_CLOSE(sym) \
[sym] = JSON_CLOSE
#define JSON_SYM_BARE(sym) \
[sym] = JSON_BARE
#define JSON_SYM_UNBARE(sym) \
[sym] = JSON_UNBARE
#define JSON_SYM_QUOTE(sym) \
[sym] = JSON_QUOTE
#define JSON_SYM_UNQUOTE(sym) \
[sym] = JSON_UNQUOTE
int jsmn_parse(const unsigned char *js, jsontok_t *tokens, size_t num_tokens, int **errpos) {
int jsmn_token_start(jsontype_t type, int pos) {
unsigned int i;
for (i = 0; i<num_tokens; i++) {
if (tokens[i].start == -1 && tokens[i].end == -1) {
tokens[i].start = pos;
tokens[i].type = type;
return 0;
}
}
return -1;
}
int jsmn_token_end(jsontype_t type, int pos) {
unsigned int i;
for (i = num_tokens - 1; i>= 0; i--) {
if (tokens[i].type == type && tokens[i].start != -1 && tokens[i].end == -1) {
tokens[i].end = pos;
return 0;
}
}
return -1;
}
const unsigned char *p;
jsontok_t *cur_token;
int obj_common[] = {
JSON_SYM_ERROR(0 ... 255),
JSON_SYM_SKIP('\t'), JSON_SYM_SKIP('\r'),JSON_SYM_SKIP('\n'),
JSON_SYM_SKIP(':'), JSON_SYM_SKIP(','), JSON_SYM_SKIP(' '),
JSON_SYM_QUOTE('\"'),
JSON_SYM_OPEN('['), JSON_SYM_CLOSE(']'),
JSON_SYM_OPEN('{'), JSON_SYM_CLOSE('}'),
JSON_SYM_BARE('-'), JSON_SYM_BARE('0'...'9'),
JSON_SYM_BARE('t'), JSON_SYM_BARE('f'), JSON_SYM_BARE('n') /* true false null */
};
int obj_bare[] = {
JSON_SYM_ERROR(0 ... 31),
JSON_SYM_ERROR(127 ... 255),
JSON_SYM_SKIP(32 ... 126),
JSON_SYM_UNBARE('\t'), JSON_SYM_UNBARE(' '),
JSON_SYM_UNBARE('\r'), JSON_SYM_UNBARE('\n'),
JSON_SYM_UNBARE(','), JSON_SYM_UNBARE(']'),
JSON_SYM_UNBARE('}')
};
int obj_string[] = {
JSON_SYM_ERROR(0 ... 31), JSON_SYM_ERROR(127),
JSON_SYM_SKIP(32 ... 126),
JSON_SYM_UNQUOTE('\"'),
JSON_SYM_ERROR(248 ... 255),
};
int *obj_state = obj_common;
cur_token = tokens;
int i;
for (i = 0; i<num_tokens; i++) {
tokens[i].start = tokens[i].end = -1;
tokens[i].type = JSON_OTHER;
}
for (p = js; *p != '\0'; ) {
switch (obj_state[*p]) {
case JSON_ERROR:
if (errpos != NULL) {
*errpos = p;
}
return -1;
case JSON_OPEN:
jsmn_token_start(JSON_OBJECT, p - js);
break;
case JSON_CLOSE:
jsmn_token_end(JSON_OBJECT, p - js + 1);
break;
case JSON_BARE:
jsmn_token_start(JSON_OTHER, p - js);
obj_state = obj_bare;
break;
case JSON_UNBARE:
jsmn_token_end(JSON_OTHER, p - js);
obj_state = obj_common;
continue;
case JSON_QUOTE:
jsmn_token_start(JSON_STRING, p - js + 1);
obj_state = obj_string;
break;
case JSON_UNQUOTE:
jsmn_token_end(JSON_STRING, p - js);
obj_state = obj_common;
break;
case JSON_SKIP:
break;
}
p++;
}
return 0;
}
void json_dump_obj(jsontok_t *obj, const char *js) {
int len;
printf("[%d,%d]", obj->start, obj->end);
len = obj->end - obj->start;
char *type;
switch (obj->type) {
case JSON_OTHER:
type = "other";
break;
case JSON_STRING:
type = "string";
break;
case JSON_ARRAY:
type = "array";
break;
case JSON_OBJECT:
type = "object";
break;
}
printf(" %s ", type);
if (len > 0) {
char *s = strndup(&js[obj->start], len);
printf("%s", s);
free(s);
}
printf("\n");
}
int main(int argc, char *argv[]) {
int i;
#define NUM_TOKENS 20
jsontok_t tokens[NUM_TOKENS];
const char *js =
"{"
"\"foo\": \"bar\","
"\"bar\": [1,2, 3],"
"\"obj\": { \"true\": false}"
"}";
jsmn_parse(js, tokens, NUM_TOKENS, NULL);
for (i = 0; i<NUM_TOKENS; i++) {
json_dump_obj(&tokens[i], js);
}
return 0;
}
|