From de8a4589e56812ef76bc3c38c76581a6c84736ba Mon Sep 17 00:00:00 2001
From: Stephen Diehl <stephen.m.diehl@gmail.com>
Date: Mon, 14 May 2012 14:44:06 -0400
Subject: [PATCH] Added namelookup.

---
 zipline/utils/protocol_utils.py | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/zipline/utils/protocol_utils.py b/zipline/utils/protocol_utils.py
index 86ea1d2f..621d7ab9 100644
--- a/zipline/utils/protocol_utils.py
+++ b/zipline/utils/protocol_utils.py
@@ -152,3 +152,23 @@ class ndict(MutableMapping):
                 #return False
 
         #return True
+
+# This is not neccesarily the most intuitive construction, but
+# we're aiming for raw performance rather than readability. So
+# we do things that we would not normally do in business logic.
+def namelookup(dct):
+    ks = dct.keys()
+    vs = dct.values()
+    dct = {}
+    class _lookup:
+        __slots__ = ks
+        def __init__(self):
+            for k, v in zip(ks, vs):
+                setattr(self,k,v)
+            self.__setattr__ = self.locked
+        def locked(self,k,v):
+            raise Exception('Name lookups are fixed at init.')
+        def __repr__(self):
+            return '<namelookup %s>' % self.__slots__
+    del dct
+    return _lookup()