From 77df277db3e9dff36f280d67ea931ee4d16c524b Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Fri, 8 Apr 2011 07:28:28 -0600
Subject: [PATCH] Conversion pipeline: Workaround for bug in lxml that causes a
 massive mem leak on windows and OS X when the input document contains non
 ASCII CSS selectors. Fixes #754555 (Private bug)

---
 src/calibre/ebooks/oeb/stylizer.py           | 4 ++++
 src/calibre/gui2/metadata/single_download.py | 4 ++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/calibre/ebooks/oeb/stylizer.py b/src/calibre/ebooks/oeb/stylizer.py
index 42974be355..634f7f5fce 100644
--- a/src/calibre/ebooks/oeb/stylizer.py
+++ b/src/calibre/ebooks/oeb/stylizer.py
@@ -97,6 +97,10 @@ class CSSSelector(etree.XPath):
 
     def __init__(self, css, namespaces=XPNSMAP):
         css = self.MIN_SPACE_RE.sub(r'\1', css)
+        if isinstance(css, unicode):
+            # Workaround for bug in lxml on windows/OS X that causes a massive
+            # memory leak with non ASCII selectors
+            css = css.encode('ascii', 'ignore').decode('ascii')
         try:
             path = css_to_xpath(css)
         except UnicodeEncodeError: # Bug in css_to_xpath
diff --git a/src/calibre/gui2/metadata/single_download.py b/src/calibre/gui2/metadata/single_download.py
index 79a1db131b..176c164d3d 100644
--- a/src/calibre/gui2/metadata/single_download.py
+++ b/src/calibre/gui2/metadata/single_download.py
@@ -52,7 +52,7 @@ class RichTextDelegate(QStyledItemDelegate): # {{{
         painter.restore()
 # }}}
 
-class ResultsModel(QAbstractTableModel):
+class ResultsModel(QAbstractTableModel): # {{{
 
     COLUMNS = (
             '#', _('Title'), _('Published'), _('Has cover'), _('Has summary')
@@ -128,7 +128,7 @@ class ResultsModel(QAbstractTableModel):
         self.results.sort(key=key, reverse=order==Qt.AscendingOrder)
         self.reset()
 
-
+# }}}
 
 class ResultsView(QTableView): # {{{