From 2966334d384946c16a104b6c9964a1999b23b838 Mon Sep 17 00:00:00 2001
From: Leonard Richardson <leonard.richardson@canonical.com>
Date: Fri, 24 Feb 2012 10:37:47 -0500
Subject: Warn when SoupStrainer is used with the html5lib tree builder.

---
 bs4/builder/_html5lib.py | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'bs4/builder/_html5lib.py')

diff --git a/bs4/builder/_html5lib.py b/bs4/builder/_html5lib.py
index 26b1773..cf716df 100644
--- a/bs4/builder/_html5lib.py
+++ b/bs4/builder/_html5lib.py
@@ -2,6 +2,7 @@ __all__ = [
     'HTML5TreeBuilder',
     ]
 
+import warnings
 from bs4.builder import (
     PERMISSIVE,
     HTML,
@@ -30,6 +31,8 @@ class HTML5TreeBuilder(HTMLTreeBuilder):
 
     # These methods are defined by Beautiful Soup.
     def feed(self, markup):
+        if self.soup.parse_only is not None:
+            warnings.warn("You provided a value for parse_only, but the html5lib tree builder doesn't support parse_only. The entire document will be parsed.")
         parser = html5lib.HTMLParser(tree=self.create_treebuilder)
         doc = parser.parse(markup, encoding=self.user_specified_encoding)
 
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