object: Add JsonObjectIter to ease iteration over JsonObject members

This is a stack-allocated iterator object similar to GHashTableIter
which allows allocation-free iteration over the members in a JsonObject.

It differs from json_object_foreach_member() in the order in which it
iterates — for JsonObjectIter the order is undefined.

https://bugzilla.gnome.org/show_bug.cgi?id=755509

1 files changed, 28 insertions, 0 deletions

diff --git a/json-glib/tests/object.c b/json-glib/tests/object.c
index f109464..54b5934 100644
--- a/json-glib/tests/object.c
+++ b/json-glib/tests/object.c
@@ -140,6 +140,33 @@ test_foreach_member (void)
 }
 
 static void
+test_iter (void)
+{
+  JsonObject *object = NULL;
+  TestForeachFixture fixture = { 0, };
+  JsonObjectIter iter;
+  const gchar *member_name;
+  JsonNode *member_node;
+
+  object = json_object_new ();
+
+  json_object_set_int_member (object, "integer", 42);
+  json_object_set_boolean_member (object, "boolean", TRUE);
+  json_object_set_string_member (object, "string", "hello");
+  json_object_set_double_member (object, "double", 3.14159);
+  json_object_set_null_member (object, "null");
+
+  json_object_iter_init (&iter, object);
+
+  while (json_object_iter_next (&iter, &member_name, &member_node))
+    verify_foreach (object, member_name, member_node, &fixture);
+
+  g_assert_cmpint (fixture.n_members, ==, json_object_get_size (object));
+
+  json_object_unref (object);
+}
+
+static void
 test_empty_member (void)
 {
   JsonObject *object = json_object_new ();
@@ -173,6 +200,7 @@ main (int   argc,
   g_test_add_func ("/object/set-member", test_set_member);
   g_test_add_func ("/object/remove-member", test_remove_member);
   g_test_add_func ("/object/foreach-member", test_foreach_member);
+  g_test_add_func ("/object/iter", test_iter);
   g_test_add_func ("/object/empty-member", test_empty_member);
 
   return g_test_run ();