Cleanup and README.

README.rst

@@ -19,6 +19,8 @@ Known limitations:
 
 - Public imports are not implemented.
 
+- Optional fields (added in protobuf 3.12) are not implemented.
+
 Project homepage: https://github.com/eerimoq/pbtools
 
 Documentation: https://pbtools.readthedocs.io

pbtools/parser.py

@@ -398,7 +398,6 @@ def __init__(self, tokens, namespace):
         self.enums = []
         self.messages = []
         self.oneofs = []
-        self.maps = []
         self.namespace = namespace
 
         for item in tokens[3]:
@@ -414,13 +413,13 @@ def __init__(self, tokens, namespace):
             elif kind == 'oneof':
                 self.oneofs.append(Oneof(item, sub_namespace))
             elif kind == 'map':
-                self._load_map_field(item, sub_namespace)
+                self._load_map(item, sub_namespace)
             elif kind in ['reserved', ';']:
                 pass
             else:
                 raise InternalError(kind)
 
-    def _load_map_field(self, tokens, sub_namespace):
+    def _load_map(self, tokens, sub_namespace):
         key_type = tokens[2]
         value_type = load_message_type(tokens[4])[-1]
         name = tokens[6]