Add parsing support for class declaration keywords like metaclass

Author: knutwannheden

rewrite/rewrite/python/_parser_visitor.py

@@ -228,13 +228,14 @@ def visit_ClassDef(self, node):
         name = self.__convert_name(node.name)
         save_cursor = self._cursor
         interfaces_prefix = self.__whitespace()
-        if node.bases and self.__cursor_at('('):
+        if (node.bases or node.keywords) and self.__cursor_at('('):
+            all = node.bases + node.keywords
             self.__skip('(')
             interfaces = JContainer(
                 interfaces_prefix,
                 [
-                    self.__pad_list_element(self.__convert_type(n), i == len(node.bases) - 1, end_delim=')') for i, n in
-                    enumerate(node.bases)],
+                    self.__pad_list_element(self.__convert_type(n), i == len(all) - 1, end_delim=')') for i, n in
+                    enumerate(all)],
                 Markers.EMPTY
             )
         elif self.__cursor_at('('):

rewrite/tests/python/all/class_test.py

@@ -86,9 +86,22 @@ def test_bases_via_call():
             """\
             def fun():
                 return []
-            
+
             class Derived(fun()):
                 pass
             """
         )
     )
+
+
+def test_metaclass():
+    # language=python
+    rewrite_run(
+        python(
+            """\
+            from typing import Type
+            class Derived(metaclass=Type):
+                pass
+            """
+        )
+    )