Use Context.create_name instead of weird playing with params everywhere

jedi/api/__init__.py

@@ -302,8 +302,8 @@ class Script(object):
             # Without a name we really just want to jump to the result e.g.
             # executed by `foo()`, if we the cursor is after `)`.
             return self.goto_definitions(only_stubs=only_stubs, prefer_stubs=prefer_stubs)
-        context = self._get_module_context().create_context(tree_name)
-        names = list(self._inference_state.goto(context, tree_name))
+        name = self._get_module_context().create_name(tree_name)
+        names = list(name.goto())
 
         if follow_imports:
             names = filter_follow_imports(names)

jedi/inference/__init__.py

@@ -305,6 +305,7 @@ class InferenceState(object):
                 if is_simple_name:
                     return [TreeNameDefinition(context, name)]
             elif type_ == 'param':
+                assert False
                 funcdef = tree.search_ancestor(name, 'funcdef', 'lambdef')
                 func = context.get_root_context().create_value(funcdef)
                 return [SimpleParamName(func, name)]

jedi/inference/context.py

@@ -6,6 +6,7 @@ from parso.python.tree import Name
 
 from jedi.inference.filters import ParserTreeFilter, MergedFilter, \
     GlobalNameFilter
+from jedi.inference.names import SimpleParamName, TreeNameDefinition
 from jedi.inference.base_value import NO_VALUES, ValueSet
 from jedi.parser_utils import get_parent_scope
 from jedi import debug
@@ -271,6 +272,16 @@ class TreeContextMixin(object):
                     scope_node = parent_scope(scope_node)
         return from_scope_node(scope_node, is_nested=True)
 
+    def create_name(self, tree_name):
+        definition = tree_name.get_definition()
+        if definition and definition.type == 'param' and definition.name == tree_name:
+            funcdef = search_ancestor(definition, 'funcdef', 'lambdef')
+            func = self.create_value(funcdef)
+            return SimpleParamName(func, tree_name)
+        else:
+            context = self.create_context(tree_name)
+            return TreeNameDefinition(context, tree_name)
+
 
 class FunctionContext(TreeContextMixin, ValueContext):
     def get_filters(self, until_position=None, origin_scope=None):

jedi/inference/usages.py

@@ -1,7 +1,4 @@
-from parso.python.tree import search_ancestor
-
 from jedi.inference import imports
-from jedi.inference.names import TreeNameDefinition, SimpleParamName
 
 
 def _resolve_names(definition_names, avoid_names=()):
@@ -29,14 +26,7 @@ def _dictionarize(names):
 
 
 def _find_names(module_context, tree_name):
-    definition = tree_name.get_definition()
-    if definition and definition.type == 'param' and definition.name == tree_name:
-        funcdef = search_ancestor(definition, 'funcdef', 'lambdef')
-        func = module_context.create_value(funcdef)
-        name = SimpleParamName(func, tree_name)
-    else:
-        context = module_context.create_context(tree_name)
-        name = TreeNameDefinition(context, tree_name)
+    name = module_context.create_name(tree_name)
     found_names = set(name.goto())
     found_names.add(name)
     return _dictionarize(_resolve_names(found_names))