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Add support for JSON pretty printing 

The monitor does not pretty-print JSON output, so that everything
will be on a single line reply. When JSON docs get large this is
quite unpleasant to read. For the future command line capabilities
query ability, huge JSON docs will be available. This needs the
ability to pretty-print.

This introduces a new API qobject_to_json_pretty() that does
a minimal indentation of list and dict members. As an example,
this makes

  {"QMP": {"version": {"micro": 50, "minor": 12, "package": "", "major": 0}, "capabilities": []}}

Output as

  {
      "QMP": {
          "version": {
              "micro": 50,
              "minor": 12,
              "package": "",
              "major": 0
          },
          "capabilities": [
          ]
      }
  }

NB: this is not turned on for the QMP monitor.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
This commit is contained in:
Daniel P. Berrange 2010-06-07 15:42:14 +01:00 committed by Luiz Capitulino
parent 2c50e26efd
commit 212b600868
2 changed files with 48 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

55
qjson.c
View File

@ -72,43 +72,57 @@ QObject *qobject_from_jsonf(const char *string, ...)
typedef struct ToJsonIterState
{
int indent;
int pretty;
int count;
QString *str;
} ToJsonIterState;
static void to_json(const QObject *obj, QString *str);
static void to_json(const QObject *obj, QString *str, int pretty, int indent);
static void to_json_dict_iter(const char *key, QObject *obj, void *opaque)
{
ToJsonIterState *s = opaque;
QString *qkey;
int j;
if (s->count) {
if (s->count)
qstring_append(s->str, ", ");
if (s->pretty) {
qstring_append(s->str, "\n");
for (j = 0 ; j < s->indent ; j++)
qstring_append(s->str, " ");
}
qkey = qstring_from_str(key);
to_json(QOBJECT(qkey), s->str);
to_json(QOBJECT(qkey), s->str, s->pretty, s->indent);
QDECREF(qkey);
qstring_append(s->str, ": ");
to_json(obj, s->str);
to_json(obj, s->str, s->pretty, s->indent);
s->count++;
}
static void to_json_list_iter(QObject *obj, void *opaque)
{
ToJsonIterState *s = opaque;
int j;
if (s->count) {
if (s->count)
qstring_append(s->str, ", ");
if (s->pretty) {
qstring_append(s->str, "\n");
for (j = 0 ; j < s->indent ; j++)
qstring_append(s->str, " ");
}
to_json(obj, s->str);
to_json(obj, s->str, s->pretty, s->indent);
s->count++;
}
static void to_json(const QObject *obj, QString *str)
static void to_json(const QObject *obj, QString *str, int pretty, int indent)
{
switch (qobject_type(obj)) {
case QTYPE_QINT: {
@ -193,8 +207,16 @@ static void to_json(const QObject *obj, QString *str)
s.count = 0;
s.str = str;
s.indent = indent + 1;
s.pretty = pretty;
qstring_append(str, "{");
qdict_iter(val, to_json_dict_iter, &s);
if (pretty) {
int j;
qstring_append(str, "\n");
for (j = 0 ; j < indent ; j++)
qstring_append(str, " ");
}
qstring_append(str, "}");
break;
}
@ -204,8 +226,16 @@ static void to_json(const QObject *obj, QString *str)
s.count = 0;
s.str = str;
s.indent = indent + 1;
s.pretty = pretty;
qstring_append(str, "[");
qlist_iter(val, (void *)to_json_list_iter, &s);
if (pretty) {
int j;
qstring_append(str, "\n");
for (j = 0 ; j < indent ; j++)
qstring_append(str, " ");
}
qstring_append(str, "]");
break;
}
@ -249,7 +279,16 @@ QString *qobject_to_json(const QObject *obj)
{
QString *str = qstring_new();
to_json(obj, str);
to_json(obj, str, 0, 0);
return str;
}
QString *qobject_to_json_pretty(const QObject *obj)
{
QString *str = qstring_new();
to_json(obj, str, 1, 0);
return str;
}

1
qjson.h
View File

@ -24,5 +24,6 @@ QObject *qobject_from_jsonf(const char *string, ...)
QObject *qobject_from_jsonv(const char *string, va_list *ap);
QString *qobject_to_json(const QObject *obj);
QString *qobject_to_json_pretty(const QObject *obj);
#endif /* QJSON_H */