qjson.c

   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
  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_json(const char *string)
  38 {
  39     JSONParsingState state = {};
  40
  41     json_message_parser_init(&state.parser, parse_json);
  42     json_message_parser_feed(&state.parser, string, strlen(string));
  43     json_message_parser_flush(&state.parser);
  44     json_message_parser_destroy(&state.parser);
  45
  46     return state.result;
  47 }
  48
  49 QObject *qobject_from_jsonf(const char *string, ...)
  50 {
  51     JSONParsingState state = {};
  52     va_list ap;
  53
  54     va_start(ap, string);
  55     state.ap = &ap;
  56
  57     json_message_parser_init(&state.parser, parse_json);
  58     json_message_parser_feed(&state.parser, string, strlen(string));
  59     json_message_parser_flush(&state.parser);
  60     json_message_parser_destroy(&state.parser);
  61
  62     va_end(ap);
  63
  64     return state.result;
  65 }
  66
  67 typedef struct ToJsonIterState
  68 {
  69     int count;
  70     QString *str;
  71 } ToJsonIterState;
  72
  73 static void to_json(const QObject *obj, QString *str);
  74
  75 static void to_json_dict_iter(const char *key, QObject *obj, void *opaque)
  76 {
  77     ToJsonIterState *s = opaque;
  78     QString *qkey;
  79
  80     if (s->count) {
  81         qstring_append(s->str, ", ");
  82     }
  83
  84     qkey = qstring_from_str(key);
  85     to_json(QOBJECT(qkey), s->str);
  86     QDECREF(qkey);
  87
  88     qstring_append(s->str, ": ");
  89     to_json(obj, s->str);
  90     s->count++;
  91 }
  92
  93 static void to_json_list_iter(QObject *obj, void *opaque)
  94 {
  95     ToJsonIterState *s = opaque;
  96
  97     if (s->count) {
  98         qstring_append(s->str, ", ");
  99     }
 100
 101     to_json(obj, s->str);
 102     s->count++;
 103 }
 104
 105 static void to_json(const QObject *obj, QString *str)
 106 {
 107     switch (qobject_type(obj)) {
 108     case QTYPE_QINT: {
 109         QInt *val = qobject_to_qint(obj);
 110         char buffer[1024];
 111
 112         snprintf(buffer, sizeof(buffer), "%" PRId64, qint_get_int(val));
 113         qstring_append(str, buffer);
 114         break;
 115     }
 116     case QTYPE_QSTRING: {
 117         QString *val = qobject_to_qstring(obj);
 118         const char *ptr;
 119
 120         ptr = qstring_get_str(val);
 121         qstring_append(str, "\"");
 122         while (*ptr) {
 123             if ((ptr[0] & 0xE0) == 0xE0 &&
 124                 (ptr[1] & 0x80) && (ptr[2] & 0x80)) {
 125                 uint16_t wchar;
 126                 char escape[7];
 127
 128                 wchar  = (ptr[0] & 0x0F) << 12;
 129                 wchar |= (ptr[1] & 0x3F) << 6;
 130                 wchar |= (ptr[2] & 0x3F);
 131                 ptr += 2;
 132
 133                 snprintf(escape, sizeof(escape), "\\u%04X", wchar);
 134                 qstring_append(str, escape);
 135             } else if ((ptr[0] & 0xE0) == 0xC0 && (ptr[1] & 0x80)) {
 136                 uint16_t wchar;
 137                 char escape[7];
 138
 139                 wchar  = (ptr[0] & 0x1F) << 6;
 140                 wchar |= (ptr[1] & 0x3F);
 141                 ptr++;
 142
 143                 snprintf(escape, sizeof(escape), "\\u%04X", wchar);
 144                 qstring_append(str, escape);
 145             } else switch (ptr[0]) {
 146                 case '\"':
 147                     qstring_append(str, "\\\"");
 148                     break;
 149                 case '\\':
 150                     qstring_append(str, "\\\\");
 151                     break;
 152                 case '\b':
 153                     qstring_append(str, "\\b");
 154                     break;
 155                 case '\n':
 156                     qstring_append(str, "\\n");
 157                     break;
 158                 case '\r':
 159                     qstring_append(str, "\\r");
 160                     break;
 161                 case '\t':
 162                     qstring_append(str, "\\t");
 163                     break;
 164                 default: {
 165                     char buf[2] = { ptr[0], 0 };
 166                     qstring_append(str, buf);
 167                     break;
 168                 }
 169                 }
 170             ptr++;
 171         }
 172         qstring_append(str, "\"");
 173         break;
 174     }
 175     case QTYPE_QDICT: {
 176         ToJsonIterState s;
 177         QDict *val = qobject_to_qdict(obj);
 178
 179         s.count = 0;
 180         s.str = str;
 181         qstring_append(str, "{");
 182         qdict_iter(val, to_json_dict_iter, &s);
 183         qstring_append(str, "}");
 184         break;
 185     }
 186     case QTYPE_QLIST: {
 187         ToJsonIterState s;
 188         QList *val = qobject_to_qlist(obj);
 189
 190         s.count = 0;
 191         s.str = str;
 192         qstring_append(str, "[");
 193         qlist_iter(val, (void *)to_json_list_iter, &s);
 194         qstring_append(str, "]");
 195         break;
 196     }
 197     case QTYPE_QFLOAT: {
 198         QFloat *val = qobject_to_qfloat(obj);
 199         char buffer[1024];
 200         int len;
 201
 202         len = snprintf(buffer, sizeof(buffer), "%f", qfloat_get_double(val));
 203         while (len > 0 && buffer[len - 1] == '0') {
 204             len--;
 205         }
 206
 207         if (len && buffer[len - 1] == '.') {
 208             buffer[len - 1] = 0;
 209         } else {
 210             buffer[len] = 0;
 211         }
 212
 213         qstring_append(str, buffer);
 214         break;
 215     }
 216     case QTYPE_QBOOL: {
 217         QBool *val = qobject_to_qbool(obj);
 218
 219         if (qbool_get_int(val)) {
 220             qstring_append(str, "true");
 221         } else {
 222             qstring_append(str, "false");
 223         }
 224         break;
 225     }
 226     case QTYPE_NONE:
 227         break;
 228     }
 229 }
 230
 231 QString *qobject_to_json(const QObject *obj)
 232 {
 233     QString *str = qstring_new();
 234
 235     to_json(obj, str);
 236
 237     return str;
 238 }