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
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
56/*
57 * IMPORTANT: This function aborts on error, thus it must not
58 * be used with untrusted arguments.
59 */
60QObject *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
73typedef struct ToJsonIterState
74{
75    int indent;
76    int pretty;
77    int count;
78    QString *str;
79} ToJsonIterState;
80
81static void to_json(const QObject *obj, QString *str, int pretty, int indent);
82
83static 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
107static 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
125static 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    case QTYPE_MAX:
264        abort();
265    }
266}
267
268QString *qobject_to_json(const QObject *obj)
269{
270    QString *str = qstring_new();
271
272    to_json(obj, str, 0, 0);
273
274    return str;
275}
276
277QString *qobject_to_json_pretty(const QObject *obj)
278{
279    QString *str = qstring_new();
280
281    to_json(obj, str, 1, 0);
282
283    return str;
284}
285