From 612c49f545b5374be45dbb4da21a5d708ebb894f Mon Sep 17 00:00:00 2001
From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Wed, 2 May 2007 23:51:01 +0000
Subject: - Aliasizer removed.  hooray ! - ClauseVisitor has handy chain()
 method.

---
 lib/sqlalchemy/sql.py | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

(limited to 'lib/sqlalchemy/sql.py')

diff --git a/lib/sqlalchemy/sql.py b/lib/sqlalchemy/sql.py
index ab64d6528..fe987cc11 100644
--- a/lib/sqlalchemy/sql.py
+++ b/lib/sqlalchemy/sql.py
@@ -828,7 +828,21 @@ class ClauseVisitor(object):
     def traverse(self, obj):
         for n in obj.get_children(**self.__traverse_options__):
             self.traverse(n)
-        obj.accept_visitor(self)
+        v = self
+        while v is not None:
+            obj.accept_visitor(v)
+            v = getattr(v, '_next', None)
+        
+    def chain(self, visitor):
+        """'chain' an additional ClauseVisitor onto this ClauseVisitor.
+        
+        the chained visitor will receive all visit events after this one."""
+        tail = self
+        while getattr(tail, '_next', None) is not None:
+            tail = tail._next
+        tail._next = visitor
+        return self
+        
     def visit_column(self, column):
         pass
     def visit_table(self, table):
-- 
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