fdo#50470: Restore pyuno object method introspection in Python 3

Switch to __dir__ entry point for introspection as Python 3 dropped support
for __members__/__methods__.  This is backwards compatible to Python 2.6.

Module initialization adjusted to complete type setup (needed for tp_dict)
via PyType_Ready.

Change-Id: Ie1f7b9dd4279242de89d009eb7acdc8c786dab8f
Reviewed-on: https://gerrit.libreoffice.org/5375
Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>

pyuno/source/module/pyuno.cxx

@@ -427,6 +427,32 @@ PyObject *PyUNO_str( PyObject * self )
     return PyStr_FromString( buf.getStr());
 }
 
+PyObject* PyUNO_dir (PyObject* self)
+{
+    PyUNO* me = (PyUNO*) self;
+
+    PyObject* member_list = NULL;
+    Sequence<OUString> oo_member_list;
+
+    try
+    {
+        oo_member_list = me->members->xInvocation->getMemberNames ();
+        member_list = PyList_New (oo_member_list.getLength ());
+        for (int i = 0; i < oo_member_list.getLength (); i++)
+        {
+            // setitem steals a reference
+            PyList_SetItem (member_list, i, ustring2PyString(oo_member_list[i]).getAcquired() );
+        }
+    }
+    catch( const RuntimeException &e )
+    {
+        raisePyExceptionWithAny( makeAny(e) );
+    }
+
+    return member_list;
+}
+
+
 PyObject* PyUNO_getattr (PyObject* self, char* name)
 {
     PyUNO* me;
@@ -437,31 +463,10 @@ PyObject* PyUNO_getattr (PyObject* self, char* name)
         Runtime runtime;
 
         me = (PyUNO*) self;
-        //Handle Python dir () stuff first...
-        if (strcmp (name, "__members__") == 0)
-        {
-            PyObject* member_list;
-            Sequence<OUString> oo_member_list;
-
-            oo_member_list = me->members->xInvocation->getMemberNames ();
-            member_list = PyList_New (oo_member_list.getLength ());
-            for (int i = 0; i < oo_member_list.getLength (); i++)
-            {
-                // setitem steals a reference
-                PyList_SetItem (member_list, i, ustring2PyString(oo_member_list[i]).getAcquired() );
-            }
-            return member_list;
-        }
-
         if (strcmp (name, "__dict__") == 0)
         {
-            Py_INCREF (Py_None);
-            return Py_None;
-        }
-        if (strcmp (name, "__methods__") == 0)
-        {
-            Py_INCREF (Py_None);
-            return Py_None;
+            Py_INCREF (Py_TYPE(me)->tp_dict);
+            return Py_TYPE(me)->tp_dict;
         }
         if (strcmp (name, "__class__") == 0)
         {
@@ -638,6 +643,13 @@ static PyObject* PyUNO_cmp( PyObject *self, PyObject *that, int op )
     return result;
 }
 
+static PyMethodDef PyUNOMethods[] =
+{
+    {"__dir__", (PyCFunction)PyUNO_dir, METH_NOARGS, NULL},
+    {NULL,      NULL,                   0,           NULL}
+};
+
+
 /* Python 2 has a tp_flags value for rich comparisons.  Python 3 does not (on by default) */
 #ifdef Py_TPFLAGS_HAVE_RICHCOMPARE
 #define TP_FLAGS (Py_TPFLAGS_HAVE_RICHCOMPARE)
@@ -674,7 +686,7 @@ static PyTypeObject PyUNOType =
     0,
     (getiterfunc)0,
     (iternextfunc)0,
-    NULL,
+    PyUNOMethods,
     NULL,
     NULL,
     NULL,
@@ -698,6 +710,11 @@ static PyTypeObject PyUNOType =
 #endif
 };
 
+int PyUNO_initType()
+{
+    return PyType_Ready(&PyUNOType);
+}
+
 PyRef getPyUnoClass()
 {
     return PyRef( reinterpret_cast< PyObject * > ( &PyUNOType ) );

pyuno/source/module/pyuno_impl.hxx

@@ -188,6 +188,8 @@ typedef ::boost::unordered_map
 
 typedef ::boost::unordered_set< PyRef , PyRef::Hash , std::equal_to<PyRef> > ClassSet;
 
+int PyUNO_initType();
+
 PyObject* PyUNO_new(
     const com::sun::star::uno::Any & targetInterface,
     const com::sun::star::uno::Reference<com::sun::star::lang::XSingleServiceFactory> & ssf);

pyuno/source/module/pyuno_module.cxx

@@ -867,6 +867,7 @@ extern "C"
 #if PY_MAJOR_VERSION >= 3
 PyObject* PyInit_pyuno()
 {
+    PyUNO_initType();
     // noop when called already, otherwise needed to allow multiple threads
     PyEval_InitThreads();
     static struct PyModuleDef moduledef =
@@ -886,6 +887,7 @@ PyObject* PyInit_pyuno()
 #else
 void initpyuno()
 {
+    PyUNO_initType();
     PyEval_InitThreads();
     Py_InitModule ("pyuno", PyUNOModule_methods);
 }