LXR qemu/qjson.c

   1/*
   2 * QEMU JSON writer
   3 *
   4 * Copyright Alexander Graf
   5 *
   6 * Authors:
   7 *  Alexander Graf <agraf@suse.de>
   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/qstring.h>
  15#include <stdbool.h>
  16#include <glib.h>
  17#include <qjson.h>
  18#include <qemu/module.h>
  19#include <qom/object.h>
  20
  21struct QJSON {
  22    Object obj;
  23    QString *str;
  24    bool omit_comma;
  25};
  26
  27static void json_emit_element(QJSON *json, const char *name)
  28{
  29    /* Check whether we need to print a , before an element */
  30    if (json->omit_comma) {
  31        json->omit_comma = false;
  32    } else {
  33        qstring_append(json->str, ", ");
  34    }
  35
  36    if (name) {
  37        qstring_append(json->str, "\"");
  38        qstring_append(json->str, name);
  39        qstring_append(json->str, "\" : ");
  40    }
  41}
  42
  43void json_start_object(QJSON *json, const char *name)
  44{
  45    json_emit_element(json, name);
  46    qstring_append(json->str, "{ ");
  47    json->omit_comma = true;
  48}
  49
  50void json_end_object(QJSON *json)
  51{
  52    qstring_append(json->str, " }");
  53    json->omit_comma = false;
  54}
  55
  56void json_start_array(QJSON *json, const char *name)
  57{
  58    json_emit_element(json, name);
  59    qstring_append(json->str, "[ ");
  60    json->omit_comma = true;
  61}
  62
  63void json_end_array(QJSON *json)
  64{
  65    qstring_append(json->str, " ]");
  66    json->omit_comma = false;
  67}
  68
  69void json_prop_int(QJSON *json, const char *name, int64_t val)
  70{
  71    json_emit_element(json, name);
  72    qstring_append_int(json->str, val);
  73}
  74
  75void json_prop_str(QJSON *json, const char *name, const char *str)
  76{
  77    json_emit_element(json, name);
  78    qstring_append_chr(json->str, '"');
  79    qstring_append(json->str, str);
  80    qstring_append_chr(json->str, '"');
  81}
  82
  83const char *qjson_get_str(QJSON *json)
  84{
  85    return qstring_get_str(json->str);
  86}
  87
  88QJSON *qjson_new(void)
  89{
  90    QJSON *json = (QJSON *)object_new(TYPE_QJSON);
  91    return json;
  92}
  93
  94void qjson_finish(QJSON *json)
  95{
  96    json_end_object(json);
  97}
  98
  99static void qjson_initfn(Object *obj)
 100{
 101    QJSON *json = (QJSON *)object_dynamic_cast(obj, TYPE_QJSON);
 102    assert(json);
 103
 104    json->str = qstring_from_str("{ ");
 105    json->omit_comma = true;
 106}
 107
 108static void qjson_finalizefn(Object *obj)
 109{
 110    QJSON *json = (QJSON *)object_dynamic_cast(obj, TYPE_QJSON);
 111
 112    assert(json);
 113    qobject_decref(QOBJECT(json->str));
 114}
 115
 116static const TypeInfo qjson_type_info = {
 117    .name = TYPE_QJSON,
 118    .parent = TYPE_OBJECT,
 119    .instance_size = sizeof(QJSON),
 120    .instance_init = qjson_initfn,
 121    .instance_finalize = qjson_finalizefn,
 122};
 123
 124static void qjson_register_types(void)
 125{
 126    type_register_static(&qjson_type_info);
 127}
 128
 129type_init(qjson_register_types)
 130