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Dump the default value of object properties

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We use g_param_spec_get_default_value() to get the default GValue of a
GParamSpec, and then we serialize it into a string according to the
value's own contents and type.
This commit is contained in:
Emmanuele Bassi 2022-08-30 23:43:51 +01:00 committed by Emmanuele Bassi
parent 7e8a8bfb14
commit 3063615313
1 changed files with 45 additions and 2 deletions
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47
gdump.c
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@ -119,6 +119,40 @@ invoke_error_quark (GModule *self, const char *symbol, GError **error)
return sym ();
}
/* A simpler version of g_strdup_value_contents(), but with stable
* output and less complex semantics
*/
static char *
value_to_string (const GValue *value)
{
if (G_VALUE_HOLDS_STRING (value))
{
const char *s = g_value_get_string (value);
if (s == NULL)
return g_strdup ("NULL");
return g_strescape (s, NULL);
}
else if (g_value_type_transformable (G_VALUE_TYPE (value), G_TYPE_STRING))
{
GValue tmp = G_VALUE_INIT;
char *s;
g_value_init (&tmp, G_TYPE_STRING);
g_value_transform (value, &tmp);
s = g_strescape (g_value_get_string (&tmp), NULL);
g_value_unset (&tmp);
if (s == NULL)
return g_strdup ("NULL");
return s;
}
else
return g_strdup ("NULL");
}
static void
dump_properties (GType type, GOutputStream *out)
{
@ -147,9 +181,18 @@ dump_properties (GType type, GOutputStream *out)
if (prop->owner_type != type)
continue;
escaped_printf (out, " <property name=\"%s\" type=\"%s\" flags=\"%d\"/>\n",
prop->name, g_type_name (prop->value_type), prop->flags);
const GValue *v = g_param_spec_get_default_value (prop);
char *default_value = value_to_string (v);
escaped_printf (out, " <property name=\"%s\" type=\"%s\" flags=\"%d\" default-value=\"%s\"/>\n",
prop->name,
g_type_name (prop->value_type),
prop->flags,
default_value);
g_free (default_value);
}
g_free (props);
}