qjson.c revision 2910f183ddd5286911bc1e3499ea93cb57de8b75 
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
24typedef struct JSONParsingState
25{
26    JSONMessageParser parser;
27    va_list *ap;
28    QObject *result;
29} JSONParsingState;
30
31static 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
37QObject *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
51QObject *qobject_from_json(const char *string)
52{
53    return qobject_from_jsonv(string, NULL);
54}
55
56QObject *qobject_from_jsonf(const char *string, ...)
57{
58    QObject *obj;
59    va_list ap;
60
61    va_start(ap, string);
62    obj = qobject_from_jsonv(string, &ap);
63    va_end(ap);
64
65    return obj;
66}
67
68typedef struct ToJsonIterState
69{
70    int count;
71    QString *str;
72} ToJsonIterState;
73
74static void to_json(const QObject *obj, QString *str);
75
76static void to_json_dict_iter(const char *key, QObject *obj, void *opaque)
77{
78    ToJsonIterState *s = opaque;
79    QString *qkey;
80
81    if (s->count) {
82        qstring_append(s->str, ", ");
83    }
84
85    qkey = qstring_from_str(key);
86    to_json(QOBJECT(qkey), s->str);
87    QDECREF(qkey);
88
89    qstring_append(s->str, ": ");
90    to_json(obj, s->str);
91    s->count++;
92}
93
94static void to_json_list_iter(QObject *obj, void *opaque)
95{
96    ToJsonIterState *s = opaque;
97
98    if (s->count) {
99        qstring_append(s->str, ", ");
100    }
101
102    to_json(obj, s->str);
103    s->count++;
104}
105
106static void to_json(const QObject *obj, QString *str)
107{
108    switch (qobject_type(obj)) {
109    case QTYPE_QINT: {
110        QInt *val = qobject_to_qint(obj);
111        char buffer[1024];
112
113        snprintf(buffer, sizeof(buffer), "%" PRId64, qint_get_int(val));
114        qstring_append(str, buffer);
115        break;
116    }
117    case QTYPE_QSTRING: {
118        QString *val = qobject_to_qstring(obj);
119        const char *ptr;
120
121        ptr = qstring_get_str(val);
122        qstring_append(str, "\"");
123        while (*ptr) {
124            if ((ptr[0] & 0xE0) == 0xE0 &&
125                (ptr[1] & 0x80) && (ptr[2] & 0x80)) {
126                uint16_t wchar;
127                char escape[7];
128
129                wchar  = (ptr[0] & 0x0F) << 12;
130                wchar |= (ptr[1] & 0x3F) << 6;
131                wchar |= (ptr[2] & 0x3F);
132                ptr += 2;
133
134                snprintf(escape, sizeof(escape), "\\u%04X", wchar);
135                qstring_append(str, escape);
136            } else if ((ptr[0] & 0xE0) == 0xC0 && (ptr[1] & 0x80)) {
137                uint16_t wchar;
138                char escape[7];
139
140                wchar  = (ptr[0] & 0x1F) << 6;
141                wchar |= (ptr[1] & 0x3F);
142                ptr++;
143
144                snprintf(escape, sizeof(escape), "\\u%04X", wchar);
145                qstring_append(str, escape);
146            } else switch (ptr[0]) {
147                case '\"':
148                    qstring_append(str, "\\\"");
149                    break;
150                case '\\':
151                    qstring_append(str, "\\\\");
152                    break;
153                case '\b':
154                    qstring_append(str, "\\b");
155                    break;
156                case '\n':
157                    qstring_append(str, "\\n");
158                    break;
159                case '\r':
160                    qstring_append(str, "\\r");
161                    break;
162                case '\t':
163                    qstring_append(str, "\\t");
164                    break;
165                default: {
166                    if (ptr[0] <= 0x1F) {
167                        char escape[7];
168                        snprintf(escape, sizeof(escape), "\\u%04X", ptr[0]);
169                        qstring_append(str, escape);
170                    } else {
171                        char buf[2] = { ptr[0], 0 };
172                        qstring_append(str, buf);
173                    }
174                    break;
175                }
176                }
177            ptr++;
178        }
179        qstring_append(str, "\"");
180        break;
181    }
182    case QTYPE_QDICT: {
183        ToJsonIterState s;
184        QDict *val = qobject_to_qdict(obj);
185
186        s.count = 0;
187        s.str = str;
188        qstring_append(str, "{");
189        qdict_iter(val, to_json_dict_iter, &s);
190        qstring_append(str, "}");
191        break;
192    }
193    case QTYPE_QLIST: {
194        ToJsonIterState s;
195        QList *val = qobject_to_qlist(obj);
196
197        s.count = 0;
198        s.str = str;
199        qstring_append(str, "[");
200        qlist_iter(val, (void *)to_json_list_iter, &s);
201        qstring_append(str, "]");
202        break;
203    }
204    case QTYPE_QFLOAT: {
205        QFloat *val = qobject_to_qfloat(obj);
206        char buffer[1024];
207        int len;
208
209        len = snprintf(buffer, sizeof(buffer), "%f", qfloat_get_double(val));
210        while (len > 0 && buffer[len - 1] == '0') {
211            len--;
212        }
213
214        if (len && buffer[len - 1] == '.') {
215            buffer[len - 1] = 0;
216        } else {
217            buffer[len] = 0;
218        }
219
220        qstring_append(str, buffer);
221        break;
222    }
223    case QTYPE_QBOOL: {
224        QBool *val = qobject_to_qbool(obj);
225
226        if (qbool_get_int(val)) {
227            qstring_append(str, "true");
228        } else {
229            qstring_append(str, "false");
230        }
231        break;
232    }
233    case QTYPE_QERROR:
234        /* XXX: should QError be emitted? */
235    case QTYPE_NONE:
236        break;
237    }
238}
239
240QString *qobject_to_json(const QObject *obj)
241{
242    QString *str = qstring_new();
243
244    to_json(obj, str);
245
246    return str;
247}
248