From 1cd5984995fefa64bdb7bdd47e6e09e8d424f6d2 Mon Sep 17 00:00:00 2001
From: Chris McDonough <chrism@agendaless.com>
Date: Mon, 22 Jun 2009 02:30:13 +0000
Subject: - The values of ``subpath``, ``traversed``, and ``virtual_root_path``
   attached to the request object are always now tuples instead of   lists
 (performance).

---
 repoze/bfg/traversal.py | 46 +++++++++++++++++++++++++++-------------------
 1 file changed, 27 insertions(+), 19 deletions(-)

(limited to 'repoze/bfg/traversal.py')

diff --git a/repoze/bfg/traversal.py b/repoze/bfg/traversal.py
index 16ab7c9f4..428553ec6 100644
--- a/repoze/bfg/traversal.py
+++ b/repoze/bfg/traversal.py
@@ -505,52 +505,60 @@ class ModelGraphTraverser(object):
                 path = environ['PATH_INFO']
             except KeyError:
                 path = '/'
+
         try:
             vroot_path_string = environ[VH_ROOT_KEY]
         except KeyError:
-            vroot_path = []
+            vroot_path = ()
             vroot_idx = 0
         else:
-            vroot_path = list(traversal_path(vroot_path_string))
+            vroot_path = traversal_path(vroot_path_string)
             vroot_idx = len(vroot_path)
             path = vroot_path_string + path
 
         path = traversal_path(path)
-
-        traversed = []
-
         ob = vroot = self.root
-        name = ''
+
+        # in case you're wondering, we do dead reckoning here instead
+        # of pushing and popping temporary lists for speed purposes
 
         i = 1
+        j = vroot_idx
 
         for segment in path:
             if segment[:2] =='@@':
-                return dict(context=ob, view_name=segment[2:], subpath=path[i:],
-                            traversed=traversed, virtual_root=vroot,
-                            virtual_root_path=vroot_path, root=self.root)
+                return dict(context=ob, view_name=segment[2:],
+                            subpath=path[i:], traversed=path[:j],
+                            virtual_root=vroot,
+                            virtual_root_path=vroot_path,
+                            root=self.root)
             try:
                 getitem = ob.__getitem__
             except AttributeError:
-                return dict(context=ob, view_name=segment, subpath=path[i:],
-                            traversed=traversed, virtual_root=vroot,
-                            virtual_root_path=vroot_path, root=self.root)
+                return dict(context=ob, view_name=segment,
+                            subpath=path[i:], traversed=path[:j],
+                            virtual_root=vroot,
+                            virtual_root_path=vroot_path,
+                            root=self.root)
+
             try:
                 next = getitem(segment)
             except KeyError:
-                return dict(context=ob, view_name=segment, subpath=path[i:],
-                            traversed=traversed, virtual_root=vroot,
-                            virtual_root_path=vroot_path, root=self.root)
+                return dict(context=ob, view_name=segment,
+                            subpath=path[i:], traversed=path[:j],
+                            virtual_root=vroot,
+                            virtual_root_path=vroot_path,
+                            root=self.root)
+
             if vroot_idx == i-1:
                 vroot = ob
-            traversed.append(segment)
             ob = next
             i += 1
+            j += 1
 
         return dict(context=ob, view_name=u'', subpath=subpath,
-                    traversed=traversed, virtual_root=vroot,
-                    virtual_root_path=vroot_path,
-                    root=self.root)
+                    traversed=path, virtual_root=vroot,
+                    virtual_root_path=vroot_path, root=self.root)
 
 class TraversalContextURL(object):
     """ The IContextURL adapter used to generate URLs for a context
-- 
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