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 "json-lexer.h"
15 #include "json-parser.h"
16 #include "json-streamer.h"
17 #include "qjson.h"
18 #include "qint.h"
19 #include "qlist.h"
20 #include "qbool.h"
21 #include "qfloat.h"
22 #include "qdict.h"
23
24 typedef struct JSONParsingState
25 {
26 JSONMessageParser parser;
27 va_list *ap;
28 QObject *result;
29 } JSONParsingState;
30
parse_json(JSONMessageParser * parser,QList * tokens)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
qobject_from_jsonv(const char * string,va_list * ap)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
qobject_from_json(const char * string)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 */
qobject_from_jsonf(const char * string,...)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 count;
76 QString *str;
77 } ToJsonIterState;
78
79 static void to_json(const QObject *obj, QString *str);
80
to_json_dict_iter(const char * key,QObject * obj,void * opaque)81 static void to_json_dict_iter(const char *key, QObject *obj, void *opaque)
82 {
83 ToJsonIterState *s = opaque;
84 QString *qkey;
85
86 if (s->count) {
87 qstring_append(s->str, ", ");
88 }
89
90 qkey = qstring_from_str(key);
91 to_json(QOBJECT(qkey), s->str);
92 QDECREF(qkey);
93
94 qstring_append(s->str, ": ");
95 to_json(obj, s->str);
96 s->count++;
97 }
98
to_json_list_iter(QObject * obj,void * opaque)99 static void to_json_list_iter(QObject *obj, void *opaque)
100 {
101 ToJsonIterState *s = opaque;
102
103 if (s->count) {
104 qstring_append(s->str, ", ");
105 }
106
107 to_json(obj, s->str);
108 s->count++;
109 }
110
to_json(const QObject * obj,QString * str)111 static void to_json(const QObject *obj, QString *str)
112 {
113 switch (qobject_type(obj)) {
114 case QTYPE_QINT: {
115 QInt *val = qobject_to_qint(obj);
116 char buffer[1024];
117
118 snprintf(buffer, sizeof(buffer), "%" PRId64, qint_get_int(val));
119 qstring_append(str, buffer);
120 break;
121 }
122 case QTYPE_QSTRING: {
123 QString *val = qobject_to_qstring(obj);
124 const char *ptr;
125
126 ptr = qstring_get_str(val);
127 qstring_append(str, "\"");
128 while (*ptr) {
129 if ((ptr[0] & 0xE0) == 0xE0 &&
130 (ptr[1] & 0x80) && (ptr[2] & 0x80)) {
131 uint16_t wchar;
132 char escape[7];
133
134 wchar = (ptr[0] & 0x0F) << 12;
135 wchar |= (ptr[1] & 0x3F) << 6;
136 wchar |= (ptr[2] & 0x3F);
137 ptr += 2;
138
139 snprintf(escape, sizeof(escape), "\\u%04X", wchar);
140 qstring_append(str, escape);
141 } else if ((ptr[0] & 0xE0) == 0xC0 && (ptr[1] & 0x80)) {
142 uint16_t wchar;
143 char escape[7];
144
145 wchar = (ptr[0] & 0x1F) << 6;
146 wchar |= (ptr[1] & 0x3F);
147 ptr++;
148
149 snprintf(escape, sizeof(escape), "\\u%04X", wchar);
150 qstring_append(str, escape);
151 } else switch (ptr[0]) {
152 case '\"':
153 qstring_append(str, "\\\"");
154 break;
155 case '\\':
156 qstring_append(str, "\\\\");
157 break;
158 case '\b':
159 qstring_append(str, "\\b");
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 (ptr[0] <= 0x1F) {
172 char escape[7];
173 snprintf(escape, sizeof(escape), "\\u%04X", ptr[0]);
174 qstring_append(str, escape);
175 } else {
176 char buf[2] = { ptr[0], 0 };
177 qstring_append(str, buf);
178 }
179 break;
180 }
181 }
182 ptr++;
183 }
184 qstring_append(str, "\"");
185 break;
186 }
187 case QTYPE_QDICT: {
188 ToJsonIterState s;
189 QDict *val = qobject_to_qdict(obj);
190
191 s.count = 0;
192 s.str = str;
193 qstring_append(str, "{");
194 qdict_iter(val, to_json_dict_iter, &s);
195 qstring_append(str, "}");
196 break;
197 }
198 case QTYPE_QLIST: {
199 ToJsonIterState s;
200 QList *val = qobject_to_qlist(obj);
201
202 s.count = 0;
203 s.str = str;
204 qstring_append(str, "[");
205 qlist_iter(val, (void *)to_json_list_iter, &s);
206 qstring_append(str, "]");
207 break;
208 }
209 case QTYPE_QFLOAT: {
210 QFloat *val = qobject_to_qfloat(obj);
211 char buffer[1024];
212 int len;
213
214 len = snprintf(buffer, sizeof(buffer), "%f", qfloat_get_double(val));
215 while (len > 0 && buffer[len - 1] == '0') {
216 len--;
217 }
218
219 if (len && buffer[len - 1] == '.') {
220 buffer[len - 1] = 0;
221 } else {
222 buffer[len] = 0;
223 }
224
225 qstring_append(str, buffer);
226 break;
227 }
228 case QTYPE_QBOOL: {
229 QBool *val = qobject_to_qbool(obj);
230
231 if (qbool_get_int(val)) {
232 qstring_append(str, "true");
233 } else {
234 qstring_append(str, "false");
235 }
236 break;
237 }
238 case QTYPE_QERROR:
239 /* XXX: should QError be emitted? */
240 case QTYPE_NONE:
241 break;
242 }
243 }
244
qobject_to_json(const QObject * obj)245 QString *qobject_to_json(const QObject *obj)
246 {
247 QString *str = qstring_new();
248
249 to_json(obj, str);
250
251 return str;
252 }
253