Start getting signature inferring working

jedi/evaluate/names.py

@@ -150,8 +150,18 @@ class TreeNameDefinition(AbstractTreeName):
         return self._API_TYPES.get(definition.type, 'statement')
 
 
-class ParamNameInterface(object):
-    api_type = u'param'
+class _ParamMixin(object):
+    def maybe_positional_argument(self, include_star=True):
+        options = [Parameter.POSITIONAL_ONLY, Parameter.POSITIONAL_OR_KEYWORD]
+        if include_star:
+            options.append(Parameter.VAR_POSITIONAL)
+        return self.get_kind() in options
+
+    def maybe_keyword_argument(self, include_stars=True):
+        options = [Parameter.KEYWORD_ONLY, Parameter.POSITIONAL_OR_KEYWORD]
+        if include_stars:
+            options.append(Parameter.VAR_KEYWORD)
+        return self.get_kind() in options
 
     def _kind_string(self):
         kind = self.get_kind()
@@ -161,6 +171,10 @@ class ParamNameInterface(object):
             return '**'
         return ''
 
+
+class ParamNameInterface(_ParamMixin):
+    api_type = u'param'
+
     def get_kind(self):
         raise NotImplementedError
 
@@ -247,6 +261,17 @@ class ParamName(BaseTreeParamName):
         return params[param_node.position_index]
 
 
+class ParamNameWrapper(_ParamMixin):
+    def __init__(self, param_name):
+        self._wrapped_param_name = param_name
+
+    def __getattr__(self, name):
+        return getattr(self._wrapped_param_name, name)
+
+    def __repr__(self):
+        return '<%s: %s>' % (self.__class__.__name__, self._wrapped_param_name)
+
+
 class ImportName(AbstractNameDefinition):
     start_pos = (1, 0)
     _level = 0