From 4bc89d638c69585fc78ccfcd6d3f0ff2c5fe9bfb Mon Sep 17 00:00:00 2001
From: Dave Halter <davidhalter88@gmail.com>
Date: Thu, 10 Apr 2014 14:55:49 +0200
Subject: [PATCH] start caching some parts of the imports to significantly
 speed up numpy completions.

---
 jedi/api/classes.py      |  3 ++-
 jedi/evaluate/imports.py | 15 +++++++++++----
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/jedi/api/classes.py b/jedi/api/classes.py
index b7da6d0f..f4934ed0 100644
--- a/jedi/api/classes.py
+++ b/jedi/api/classes.py
@@ -493,7 +493,8 @@ class Completion(BaseDefinition):
         # separately in Completion.
         if self._definition.isinstance(pr.Import) and self._definition.alias is None:
             i = imports.ImportPath(self._evaluator, self._definition, True)
-            return imports.Importer(i.import_path + [unicode(self._name)],
+            import_path = tuple(i.import_path + [unicode(self._name)])
+            return imports.Importer(self._evaluator, import_path,
                                     i._importer.module).follow(self._evaluator)
         return super(Completion, self)._follow_statements_imports()
 
diff --git a/jedi/evaluate/imports.py b/jedi/evaluate/imports.py
index 686874f4..781f183e 100644
--- a/jedi/evaluate/imports.py
+++ b/jedi/evaluate/imports.py
@@ -16,7 +16,7 @@ import pkgutil
 import sys
 from itertools import chain
 
-from jedi._compatibility import find_module
+from jedi._compatibility import find_module, use_metaclass
 from jedi import common
 from jedi import debug
 from jedi import cache
@@ -27,6 +27,7 @@ from jedi.evaluate import helpers
 from jedi import settings
 from jedi.common import source_to_unicode
 from jedi.evaluate import compiled
+from jedi.evaluate.cache import CachedMetaClass, memoize_default
 
 
 class ModuleNotFound(Exception):
@@ -69,7 +70,8 @@ class ImportPath(pr.Base):
                 import_path.pop()
 
         module = import_stmt.get_parent_until()
-        self._importer = Importer(import_path, module, import_stmt.relative_count)
+        self._importer = Importer(self._evaluator, tuple(import_path), module,
+                                  import_stmt.relative_count)
 
     def __repr__(self):
         return '<%s: %s>' % (type(self).__name__, self.import_stmt)
@@ -219,8 +221,8 @@ class ImportPath(pr.Base):
         return scopes
 
 
-class Importer(object):
-    def __init__(self, import_path, module, level=0):
+class Importer(use_metaclass(CachedMetaClass)):
+    def __init__(self, evaluator, import_path, module, level=0):
         """
         An implementation similar to ``__import__``. Use `follow_file_system`
         to actually follow the imports.
@@ -233,10 +235,13 @@ class Importer(object):
 
         :param import_path: List of namespaces (strings).
         """
+        debug.speed('imp')
+        self._evaluator = evaluator
         self.import_path = import_path
         self.level = level
         self.module = module
         path = module.path
+        print(self.import_path)
         # TODO abspath
         self.file_path = os.path.dirname(path) if path is not None else None
 
@@ -246,6 +251,7 @@ class Importer(object):
             path = os.path.dirname(path)
         return path
 
+    @memoize_default()
     def sys_path_with_modifications(self):
         # If you edit e.g. gunicorn, there will be imports like this:
         # `from gunicorn import something`. But gunicorn is not in the
@@ -267,6 +273,7 @@ class Importer(object):
             return evaluator.follow_path(iter(rest), [scope], scope)
         return [scope]
 
+    @memoize_default()
     def follow_file_system(self):
         if self.file_path:
             sys_path_mod = list(self.sys_path_with_modifications())