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/*
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* QObject JSON integration
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*
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* Copyright IBM, Corp. 2009
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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#include "json-lexer.h" |
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#include "json-parser.h" |
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#include "json-streamer.h" |
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#include "qjson.h" |
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#include "qint.h" |
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#include "qlist.h" |
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#include "qbool.h" |
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#include "qfloat.h" |
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#include "qdict.h" |
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typedef struct JSONParsingState |
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{ |
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JSONMessageParser parser; |
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va_list *ap; |
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QObject *result; |
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} JSONParsingState; |
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static void parse_json(JSONMessageParser *parser, QList *tokens) |
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{ |
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JSONParsingState *s = container_of(parser, JSONParsingState, parser); |
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s->result = json_parser_parse(tokens, s->ap); |
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} |
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QObject *qobject_from_jsonv(const char *string, va_list *ap) |
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{ |
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JSONParsingState state = {}; |
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state.ap = ap; |
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json_message_parser_init(&state.parser, parse_json); |
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json_message_parser_feed(&state.parser, string, strlen(string)); |
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json_message_parser_flush(&state.parser); |
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json_message_parser_destroy(&state.parser); |
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return state.result;
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} |
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QObject *qobject_from_json(const char *string) |
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{ |
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return qobject_from_jsonv(string, NULL); |
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} |
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/*
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* IMPORTANT: This function aborts on error, thus it must not
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* be used with untrusted arguments.
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*/
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QObject *qobject_from_jsonf(const char *string, ...) |
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{ |
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QObject *obj; |
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va_list ap; |
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va_start(ap, string); |
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obj = qobject_from_jsonv(string, &ap); |
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va_end(ap); |
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assert(obj != NULL);
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return obj;
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} |
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typedef struct ToJsonIterState |
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{ |
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int count;
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QString *str; |
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} ToJsonIterState; |
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static void to_json(const QObject *obj, QString *str); |
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static void to_json_dict_iter(const char *key, QObject *obj, void *opaque) |
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{ |
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ToJsonIterState *s = opaque; |
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QString *qkey; |
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if (s->count) {
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qstring_append(s->str, ", ");
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} |
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qkey = qstring_from_str(key); |
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to_json(QOBJECT(qkey), s->str); |
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QDECREF(qkey); |
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qstring_append(s->str, ": ");
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to_json(obj, s->str); |
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s->count++; |
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} |
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static void to_json_list_iter(QObject *obj, void *opaque) |
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{ |
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ToJsonIterState *s = opaque; |
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if (s->count) {
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qstring_append(s->str, ", ");
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} |
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to_json(obj, s->str); |
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s->count++; |
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} |
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static void to_json(const QObject *obj, QString *str) |
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{ |
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switch (qobject_type(obj)) {
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case QTYPE_QINT: {
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QInt *val = qobject_to_qint(obj); |
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char buffer[1024]; |
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snprintf(buffer, sizeof(buffer), "%" PRId64, qint_get_int(val)); |
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qstring_append(str, buffer); |
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break;
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} |
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case QTYPE_QSTRING: {
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QString *val = qobject_to_qstring(obj); |
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const char *ptr; |
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ptr = qstring_get_str(val); |
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qstring_append(str, "\"");
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while (*ptr) {
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if ((ptr[0] & 0xE0) == 0xE0 && |
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(ptr[1] & 0x80) && (ptr[2] & 0x80)) { |
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uint16_t wchar; |
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char escape[7]; |
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wchar = (ptr[0] & 0x0F) << 12; |
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wchar |= (ptr[1] & 0x3F) << 6; |
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wchar |= (ptr[2] & 0x3F); |
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ptr += 2;
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snprintf(escape, sizeof(escape), "\\u%04X", wchar); |
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qstring_append(str, escape); |
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} else if ((ptr[0] & 0xE0) == 0xC0 && (ptr[1] & 0x80)) { |
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uint16_t wchar; |
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char escape[7]; |
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wchar = (ptr[0] & 0x1F) << 6; |
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wchar |= (ptr[1] & 0x3F); |
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ptr++; |
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snprintf(escape, sizeof(escape), "\\u%04X", wchar); |
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qstring_append(str, escape); |
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} else switch (ptr[0]) { |
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case '\"': |
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qstring_append(str, "\\\"");
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break;
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case '\\': |
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qstring_append(str, "\\\\");
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break;
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case '\b': |
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qstring_append(str, "\\b");
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break;
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case '\n': |
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qstring_append(str, "\\n");
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break;
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case '\r': |
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qstring_append(str, "\\r");
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break;
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case '\t': |
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qstring_append(str, "\\t");
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break;
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default: {
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if (ptr[0] <= 0x1F) { |
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char escape[7]; |
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snprintf(escape, sizeof(escape), "\\u%04X", ptr[0]); |
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qstring_append(str, escape); |
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} else {
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char buf[2] = { ptr[0], 0 }; |
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qstring_append(str, buf); |
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} |
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break;
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} |
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} |
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ptr++; |
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} |
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qstring_append(str, "\"");
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break;
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} |
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case QTYPE_QDICT: {
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ToJsonIterState s; |
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QDict *val = qobject_to_qdict(obj); |
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s.count = 0;
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s.str = str; |
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qstring_append(str, "{");
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qdict_iter(val, to_json_dict_iter, &s); |
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qstring_append(str, "}");
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break;
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} |
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case QTYPE_QLIST: {
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ToJsonIterState s; |
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QList *val = qobject_to_qlist(obj); |
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s.count = 0;
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s.str = str; |
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qstring_append(str, "[");
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qlist_iter(val, (void *)to_json_list_iter, &s);
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qstring_append(str, "]");
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break;
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} |
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case QTYPE_QFLOAT: {
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QFloat *val = qobject_to_qfloat(obj); |
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char buffer[1024]; |
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int len;
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len = snprintf(buffer, sizeof(buffer), "%f", qfloat_get_double(val)); |
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while (len > 0 && buffer[len - 1] == '0') { |
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len--; |
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} |
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if (len && buffer[len - 1] == '.') { |
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buffer[len - 1] = 0; |
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} else {
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buffer[len] = 0;
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} |
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qstring_append(str, buffer); |
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break;
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} |
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case QTYPE_QBOOL: {
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QBool *val = qobject_to_qbool(obj); |
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if (qbool_get_int(val)) {
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qstring_append(str, "true");
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} else {
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qstring_append(str, "false");
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} |
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break;
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} |
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case QTYPE_QERROR:
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/* XXX: should QError be emitted? */
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case QTYPE_NONE:
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break;
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} |
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} |
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QString *qobject_to_json(const QObject *obj)
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{ |
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QString *str = qstring_new(); |
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to_json(obj, str); |
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return str;
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} |