[gi] check to see if object is a member of a union when validating paramaters

* union members are not subclasses of the union they belong to so if an
   inteface requires you pass a union but you pass one of its members
   there will be a type error
 * this patch checks to see if the type you are passing is a member of the
   union and passes the checks if it is
 * this works in python 3 but in python 2 methods do their own isinstance
   check on the instance parameter (e.g. self) so we need to figure
   out how to override that for union methods (e.g. Gdk.Event.get_state)

https://bugzilla.gnome.org/show_bug.cgi?id=642554

1 files changed, 38 insertions, 0 deletions

diff --git a/gi/pygi-argument.c b/gi/pygi-argument.c
index dc9c2890..bbbad00b 100644
--- a/gi/pygi-argument.c
+++ b/gi/pygi-argument.c
@@ -241,8 +241,46 @@ _pygi_g_type_interface_check_object (GIBaseInfo *info,
         case GI_INFO_TYPE_BOXED:
         case GI_INFO_TYPE_INTERFACE:
         case GI_INFO_TYPE_OBJECT:
+            retval = _pygi_g_registered_type_info_check_object ( (GIRegisteredTypeInfo *) info, TRUE, object);
+            break;
         case GI_INFO_TYPE_UNION:
+
+
             retval = _pygi_g_registered_type_info_check_object ( (GIRegisteredTypeInfo *) info, TRUE, object);
+
+            /* If not the same type then check to see if the object's type
+             * is the same as one of the union's members
+             */
+            if (retval == 0) {
+                gint i;
+                gint n_fields;
+
+                n_fields = g_union_info_get_n_fields ( (GIUnionInfo *) info);
+
+                for (i = 0; i < n_fields; i++) {
+                    gint member_retval;
+                    GIFieldInfo *field_info;
+                    GITypeInfo *field_type_info;
+
+                    field_info =
+                        g_union_info_get_field ( (GIUnionInfo *) info, i);
+                    field_type_info = g_field_info_get_type (field_info);
+
+                    member_retval = _pygi_g_type_info_check_object(
+                        field_type_info,
+                        object,
+                        TRUE);
+
+                    g_base_info_unref ( ( GIBaseInfo *) field_type_info);
+                    g_base_info_unref ( ( GIBaseInfo *) field_info);
+
+                    if (member_retval == 1) {
+                        retval = member_retval;
+                        break;
+                    }
+                }
+            }
+
             break;
         default:
             g_assert_not_reached();