More Python upb.FieldDef functionality and tests.

lang_ext/python/test.py

@@ -5,10 +5,35 @@ import unittest
 class TestFieldDef(unittest.TestCase):
   def test_construction(self):
     fielddef1 = upb.FieldDef()
-    self.assertTrue(fielddef1 is not None)
-    fielddef2 = upb.FieldDef(number=1, name="field1", label=2, type=3)
-    self.assertTrue(fielddef2 is not None)
+    self.assertTrue(fielddef1.number is None)
+    self.assertTrue(fielddef1.name is None)
+    self.assertTrue(fielddef1.type is None)
+    self.assertEqual(fielddef1.label, upb.LABEL_OPTIONAL)
+
+    fielddef2 = upb.FieldDef(number=5, name="field2",
+                             label=upb.LABEL_REQUIRED, type=upb.TYPE_INT32,
+                             type_name="MyType")
+
     self.assertTrue(id(fielddef1) != id(fielddef2))
+    self.assertEqual(fielddef2.number, 5)
+    self.assertEqual(fielddef2.name, "field2")
+    self.assertEqual(fielddef2.label, upb.LABEL_REQUIRED)
+    self.assertEqual(fielddef2.type, upb.TYPE_INT32)
+    self.assertEqual(fielddef2.type_name, "MyType")
+
+    fielddef2.number = 8
+    self.assertEqual(fielddef2.number, 8)
+
+    fielddef2.name = "xxx"
+    self.assertEqual(fielddef2.name, "xxx")
+
+    fielddef2.label = upb.LABEL_REPEATED
+    self.assertEqual(fielddef2.label, upb.LABEL_REPEATED)
+
+    fielddef2.type = upb.TYPE_FLOAT
+    self.assertEqual(fielddef2.type, upb.TYPE_FLOAT)
+
+  # TODO: test that assigning invalid values is properly prevented.
 
 if __name__ == '__main__':
   unittest.main()

lang_ext/python/upb.c

@@ -60,15 +60,25 @@ static void PyUpb_FieldDef_dealloc(PyObject *obj) {
 
 static PyObject* PyUpb_FieldDef_getattro(PyObject *obj, PyObject *attr_name) {
   PyUpb_FieldDef *f = Check_FieldDef(obj, NULL);
+  if (!upb_fielddef_ismutable(f->field)) {
+    PyErr_SetString(PyExc_TypeError, "fielddef is not mutable.");
+    return NULL;
+  }
   const char *name = PyString_AsString(attr_name);
   if (streql(name, "name")) {
-    return PyString_FromString(upb_fielddef_name(f->field));
+    const char *name = upb_fielddef_name(f->field);
+    return name == NULL ? Py_None : PyString_FromString(name);
   } else if (streql(name, "number")) {
-    return PyInt_FromLong(upb_fielddef_number(f->field));
+    uint32_t num = upb_fielddef_number(f->field);
+    return num == 0 ? Py_None : PyInt_FromLong(num);
   } else if (streql(name, "type")) {
-    return PyInt_FromLong(upb_fielddef_type(f->field));
+    uint8_t type = upb_fielddef_type(f->field);
+    return type == 0 ? Py_None : PyInt_FromLong(type);
   } else if (streql(name, "label")) {
     return PyInt_FromLong(upb_fielddef_label(f->field));
+  } else if (streql(name, "type_name")) {
+    const char *name = upb_fielddef_typename(f->field);
+    return name == NULL ? Py_None : PyString_FromString(name);
   } else if (streql(name, "subdef")) {
     // NYI;
     return NULL;
@@ -150,7 +160,7 @@ static PyTypeObject PyUpb_FieldDefType = {
   0,                                      /* tp_call */
   0,                                      /* tp_str */
   &PyUpb_FieldDef_getattro,               /* tp_getattro */
-  0,                                      /* tp_setattro */
+  &PyUpb_FieldDef_setattro,               /* tp_setattro */
   0,                                      /* tp_as_buffer */
   Py_TPFLAGS_DEFAULT,                     /* tp_flags */
   0,                                      /* tp_doc */
@@ -187,4 +197,28 @@ PyMODINIT_FUNC initupb(void) {
   Py_INCREF(&PyUpb_FieldDefType);
 
   PyModule_AddObject(mod, "FieldDef", (PyObject*)&PyUpb_FieldDefType);
+
+  // Register constants.
+  PyModule_AddIntConstant(mod, "LABEL_OPTIONAL", UPB_LABEL(OPTIONAL));
+  PyModule_AddIntConstant(mod, "LABEL_REQUIRED", UPB_LABEL(REQUIRED));
+  PyModule_AddIntConstant(mod, "LABEL_REPEATED", UPB_LABEL(REPEATED));
+
+  PyModule_AddIntConstant(mod, "TYPE_DOUBLE", UPB_TYPE(DOUBLE));
+  PyModule_AddIntConstant(mod, "TYPE_FLOAT", UPB_TYPE(FLOAT));
+  PyModule_AddIntConstant(mod, "TYPE_INT64", UPB_TYPE(INT64));
+  PyModule_AddIntConstant(mod, "TYPE_UINT64", UPB_TYPE(UINT64));
+  PyModule_AddIntConstant(mod, "TYPE_INT32", UPB_TYPE(INT32));
+  PyModule_AddIntConstant(mod, "TYPE_FIXED64", UPB_TYPE(FIXED64));
+  PyModule_AddIntConstant(mod, "TYPE_FIXED32", UPB_TYPE(FIXED32));
+  PyModule_AddIntConstant(mod, "TYPE_BOOL", UPB_TYPE(BOOL));
+  PyModule_AddIntConstant(mod, "TYPE_STRING", UPB_TYPE(STRING));
+  PyModule_AddIntConstant(mod, "TYPE_GROUP", UPB_TYPE(GROUP));
+  PyModule_AddIntConstant(mod, "TYPE_MESSAGE", UPB_TYPE(MESSAGE));
+  PyModule_AddIntConstant(mod, "TYPE_BYTES", UPB_TYPE(BYTES));
+  PyModule_AddIntConstant(mod, "TYPE_UINT32", UPB_TYPE(UINT32));
+  PyModule_AddIntConstant(mod, "TYPE_ENUM", UPB_TYPE(ENUM));
+  PyModule_AddIntConstant(mod, "TYPE_SFIXED32", UPB_TYPE(SFIXED32));
+  PyModule_AddIntConstant(mod, "TYPE_SFIXED64", UPB_TYPE(SFIXED64));
+  PyModule_AddIntConstant(mod, "TYPE_SINT32", UPB_TYPE(SINT32));
+  PyModule_AddIntConstant(mod, "TYPE_SINT64", UPB_TYPE(SINT64));
 }