root / qobject / qjson.c @ 7443b437
History | View | Annotate | Download (6.8 kB)
1 |
/*
|
---|---|
2 |
* QObject JSON integration
|
3 |
*
|
4 |
* Copyright IBM, Corp. 2009
|
5 |
*
|
6 |
* Authors:
|
7 |
* Anthony Liguori <aliguori@us.ibm.com>
|
8 |
*
|
9 |
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
|
10 |
* See the COPYING.LIB file in the top-level directory.
|
11 |
*
|
12 |
*/
|
13 |
|
14 |
#include "qapi/qmp/json-lexer.h" |
15 |
#include "qapi/qmp/json-parser.h" |
16 |
#include "qapi/qmp/json-streamer.h" |
17 |
#include "qapi/qmp/qjson.h" |
18 |
#include "qapi/qmp/qint.h" |
19 |
#include "qapi/qmp/qlist.h" |
20 |
#include "qapi/qmp/qbool.h" |
21 |
#include "qapi/qmp/qfloat.h" |
22 |
#include "qapi/qmp/qdict.h" |
23 |
|
24 |
typedef struct JSONParsingState |
25 |
{ |
26 |
JSONMessageParser parser; |
27 |
va_list *ap; |
28 |
QObject *result; |
29 |
} JSONParsingState; |
30 |
|
31 |
static void parse_json(JSONMessageParser *parser, QList *tokens) |
32 |
{ |
33 |
JSONParsingState *s = container_of(parser, JSONParsingState, parser); |
34 |
s->result = json_parser_parse(tokens, s->ap); |
35 |
} |
36 |
|
37 |
QObject *qobject_from_jsonv(const char *string, va_list *ap) |
38 |
{ |
39 |
JSONParsingState state = {}; |
40 |
|
41 |
state.ap = ap; |
42 |
|
43 |
json_message_parser_init(&state.parser, parse_json); |
44 |
json_message_parser_feed(&state.parser, string, strlen(string)); |
45 |
json_message_parser_flush(&state.parser); |
46 |
json_message_parser_destroy(&state.parser); |
47 |
|
48 |
return state.result;
|
49 |
} |
50 |
|
51 |
QObject *qobject_from_json(const char *string) |
52 |
{ |
53 |
return qobject_from_jsonv(string, NULL); |
54 |
} |
55 |
|
56 |
/*
|
57 |
* IMPORTANT: This function aborts on error, thus it must not
|
58 |
* be used with untrusted arguments.
|
59 |
*/
|
60 |
QObject *qobject_from_jsonf(const char *string, ...) |
61 |
{ |
62 |
QObject *obj; |
63 |
va_list ap; |
64 |
|
65 |
va_start(ap, string); |
66 |
obj = qobject_from_jsonv(string, &ap); |
67 |
va_end(ap); |
68 |
|
69 |
assert(obj != NULL);
|
70 |
return obj;
|
71 |
} |
72 |
|
73 |
typedef struct ToJsonIterState |
74 |
{ |
75 |
int indent;
|
76 |
int pretty;
|
77 |
int count;
|
78 |
QString *str; |
79 |
} ToJsonIterState; |
80 |
|
81 |
static void to_json(const QObject *obj, QString *str, int pretty, int indent); |
82 |
|
83 |
static void to_json_dict_iter(const char *key, QObject *obj, void *opaque) |
84 |
{ |
85 |
ToJsonIterState *s = opaque; |
86 |
QString *qkey; |
87 |
int j;
|
88 |
|
89 |
if (s->count)
|
90 |
qstring_append(s->str, ", ");
|
91 |
|
92 |
if (s->pretty) {
|
93 |
qstring_append(s->str, "\n");
|
94 |
for (j = 0 ; j < s->indent ; j++) |
95 |
qstring_append(s->str, " ");
|
96 |
} |
97 |
|
98 |
qkey = qstring_from_str(key); |
99 |
to_json(QOBJECT(qkey), s->str, s->pretty, s->indent); |
100 |
QDECREF(qkey); |
101 |
|
102 |
qstring_append(s->str, ": ");
|
103 |
to_json(obj, s->str, s->pretty, s->indent); |
104 |
s->count++; |
105 |
} |
106 |
|
107 |
static void to_json_list_iter(QObject *obj, void *opaque) |
108 |
{ |
109 |
ToJsonIterState *s = opaque; |
110 |
int j;
|
111 |
|
112 |
if (s->count)
|
113 |
qstring_append(s->str, ", ");
|
114 |
|
115 |
if (s->pretty) {
|
116 |
qstring_append(s->str, "\n");
|
117 |
for (j = 0 ; j < s->indent ; j++) |
118 |
qstring_append(s->str, " ");
|
119 |
} |
120 |
|
121 |
to_json(obj, s->str, s->pretty, s->indent); |
122 |
s->count++; |
123 |
} |
124 |
|
125 |
static void to_json(const QObject *obj, QString *str, int pretty, int indent) |
126 |
{ |
127 |
switch (qobject_type(obj)) {
|
128 |
case QTYPE_QINT: {
|
129 |
QInt *val = qobject_to_qint(obj); |
130 |
char buffer[1024]; |
131 |
|
132 |
snprintf(buffer, sizeof(buffer), "%" PRId64, qint_get_int(val)); |
133 |
qstring_append(str, buffer); |
134 |
break;
|
135 |
} |
136 |
case QTYPE_QSTRING: {
|
137 |
QString *val = qobject_to_qstring(obj); |
138 |
const char *ptr; |
139 |
int cp;
|
140 |
char buf[16]; |
141 |
char *end;
|
142 |
|
143 |
ptr = qstring_get_str(val); |
144 |
qstring_append(str, "\"");
|
145 |
|
146 |
for (; *ptr; ptr = end) {
|
147 |
cp = mod_utf8_codepoint(ptr, 6, &end);
|
148 |
switch (cp) {
|
149 |
case '\"': |
150 |
qstring_append(str, "\\\"");
|
151 |
break;
|
152 |
case '\\': |
153 |
qstring_append(str, "\\\\");
|
154 |
break;
|
155 |
case '\b': |
156 |
qstring_append(str, "\\b");
|
157 |
break;
|
158 |
case '\f': |
159 |
qstring_append(str, "\\f");
|
160 |
break;
|
161 |
case '\n': |
162 |
qstring_append(str, "\\n");
|
163 |
break;
|
164 |
case '\r': |
165 |
qstring_append(str, "\\r");
|
166 |
break;
|
167 |
case '\t': |
168 |
qstring_append(str, "\\t");
|
169 |
break;
|
170 |
default:
|
171 |
if (cp < 0) { |
172 |
cp = 0xFFFD; /* replacement character */ |
173 |
} |
174 |
if (cp > 0xFFFF) { |
175 |
/* beyond BMP; need a surrogate pair */
|
176 |
snprintf(buf, sizeof(buf), "\\u%04X\\u%04X", |
177 |
0xD800 + ((cp - 0x10000) >> 10), |
178 |
0xDC00 + ((cp - 0x10000) & 0x3FF)); |
179 |
} else if (cp < 0x20 || cp >= 0x7F) { |
180 |
snprintf(buf, sizeof(buf), "\\u%04X", cp); |
181 |
} else {
|
182 |
buf[0] = cp;
|
183 |
buf[1] = 0; |
184 |
} |
185 |
qstring_append(str, buf); |
186 |
} |
187 |
}; |
188 |
|
189 |
qstring_append(str, "\"");
|
190 |
break;
|
191 |
} |
192 |
case QTYPE_QDICT: {
|
193 |
ToJsonIterState s; |
194 |
QDict *val = qobject_to_qdict(obj); |
195 |
|
196 |
s.count = 0;
|
197 |
s.str = str; |
198 |
s.indent = indent + 1;
|
199 |
s.pretty = pretty; |
200 |
qstring_append(str, "{");
|
201 |
qdict_iter(val, to_json_dict_iter, &s); |
202 |
if (pretty) {
|
203 |
int j;
|
204 |
qstring_append(str, "\n");
|
205 |
for (j = 0 ; j < indent ; j++) |
206 |
qstring_append(str, " ");
|
207 |
} |
208 |
qstring_append(str, "}");
|
209 |
break;
|
210 |
} |
211 |
case QTYPE_QLIST: {
|
212 |
ToJsonIterState s; |
213 |
QList *val = qobject_to_qlist(obj); |
214 |
|
215 |
s.count = 0;
|
216 |
s.str = str; |
217 |
s.indent = indent + 1;
|
218 |
s.pretty = pretty; |
219 |
qstring_append(str, "[");
|
220 |
qlist_iter(val, (void *)to_json_list_iter, &s);
|
221 |
if (pretty) {
|
222 |
int j;
|
223 |
qstring_append(str, "\n");
|
224 |
for (j = 0 ; j < indent ; j++) |
225 |
qstring_append(str, " ");
|
226 |
} |
227 |
qstring_append(str, "]");
|
228 |
break;
|
229 |
} |
230 |
case QTYPE_QFLOAT: {
|
231 |
QFloat *val = qobject_to_qfloat(obj); |
232 |
char buffer[1024]; |
233 |
int len;
|
234 |
|
235 |
len = snprintf(buffer, sizeof(buffer), "%f", qfloat_get_double(val)); |
236 |
while (len > 0 && buffer[len - 1] == '0') { |
237 |
len--; |
238 |
} |
239 |
|
240 |
if (len && buffer[len - 1] == '.') { |
241 |
buffer[len - 1] = 0; |
242 |
} else {
|
243 |
buffer[len] = 0;
|
244 |
} |
245 |
|
246 |
qstring_append(str, buffer); |
247 |
break;
|
248 |
} |
249 |
case QTYPE_QBOOL: {
|
250 |
QBool *val = qobject_to_qbool(obj); |
251 |
|
252 |
if (qbool_get_int(val)) {
|
253 |
qstring_append(str, "true");
|
254 |
} else {
|
255 |
qstring_append(str, "false");
|
256 |
} |
257 |
break;
|
258 |
} |
259 |
case QTYPE_QERROR:
|
260 |
/* XXX: should QError be emitted? */
|
261 |
case QTYPE_NONE:
|
262 |
break;
|
263 |
} |
264 |
} |
265 |
|
266 |
QString *qobject_to_json(const QObject *obj)
|
267 |
{ |
268 |
QString *str = qstring_new(); |
269 |
|
270 |
to_json(obj, str, 0, 0); |
271 |
|
272 |
return str;
|
273 |
} |
274 |
|
275 |
QString *qobject_to_json_pretty(const QObject *obj)
|
276 |
{ |
277 |
QString *str = qstring_new(); |
278 |
|
279 |
to_json(obj, str, 1, 0); |
280 |
|
281 |
return str;
|
282 |
} |