From b013828ad0a97f7155f892ee5d50d587d5842c98 Mon Sep 17 00:00:00 2001
From: Laurent Bachelier <laurent@bachelier.name>
Date: Tue, 17 Jun 2014 00:44:43 +0200
Subject: [PATCH] browser2: Add a filter to change the base element used for
 selectors

---
 weboob/tools/browser2/filters.py | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/weboob/tools/browser2/filters.py b/weboob/tools/browser2/filters.py
index 9e91a1c3..6b46d338 100644
--- a/weboob/tools/browser2/filters.py
+++ b/weboob/tools/browser2/filters.py
@@ -110,6 +110,20 @@ class Filter(_Filter):
         raise NotImplementedError()
 
 
+class Base(Filter):
+    """
+    Change the base element used in filters.
+    >>> Base(Env('header'), CleanText('./h1'))
+    """
+    def __call__(self, item):
+        base = self.select(self.base, item)
+        return self.selector(base)
+
+    def __init__(self, base, selector, default=_NO_DEFAULT):
+        super(Base, self).__init__(selector, default)
+        self.base = base
+
+
 class Env(_Filter):
     """
     Filter to get environment value of the item.