From a6b51e9acbcd936114674ef7894aecfab061a42b Mon Sep 17 00:00:00 2001
From: Tres Seaver <tseaver@palladion.com>
Date: Thu, 30 Apr 2009 18:17:29 +0000
Subject: Speed up / clarify 'traversal' module's 'model_path',
 'model_path_tuple', and '_model_path_list' functions.

---
 CHANGES.txt             |  3 +++
 repoze/bfg/traversal.py | 19 +++++--------------
 2 files changed, 8 insertions(+), 14 deletions(-)

diff --git a/CHANGES.txt b/CHANGES.txt
index 5070ee707..17e75f66f 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -98,6 +98,9 @@ Features
 - The notfound debug now shows the traversed path, the virtual root,
   and the virtual root path too.
 
+- Speed up / clarify 'traversal' module's 'model_path', 'model_path_tuple',
+  and '_model_path_list' functions.
+
 0.7.0 (2009-04-11)
 ==================
 
diff --git a/repoze/bfg/traversal.py b/repoze/bfg/traversal.py
index 40358ee7f..901368bba 100644
--- a/repoze/bfg/traversal.py
+++ b/repoze/bfg/traversal.py
@@ -180,11 +180,8 @@ def model_path(model, *elements):
               effectively replaced with a leading ``/``) when the path
               is generated.
     """
-    path_list = _model_path_list(model, *elements)
-    if path_list:
-        path_list = [ quote_path_segment(name) for name in path_list ]
-        return '/' + '/'.join(path_list)
-    return '/'
+    path = _model_path_list(model, *elements)
+    return path and '/'.join([quote_path_segment(x) for x in path]) or '/'
 
 def model_path_tuple(model, *elements):
     """
@@ -220,19 +217,13 @@ def model_path_tuple(model, *elements):
               always be ignored (and effectively replaced with ``''``)
               when the path is generated.
     """
-    path = _model_path_list(model, *elements)
-    if path:
-        return ('',) + tuple(path)
-    return ('',)
+    return tuple(_model_path_list(model, *elements))
 
 def _model_path_list(model, *elements):
     """ Implementation detail shared by model_path and model_path_tuple """
-    lpath = reversed(list(lineage(model))[:-1])
+    lpath = reversed(list(lineage(model)))
     path = [ location.__name__ or '' for location in lpath ]
-
-    if elements:
-        path = path + list(elements)
-
+    path.extend(elements)
     return path
 
 def virtual_root(model, request):
-- 
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