Dynamically generate a heading for Extension Docs API pages

chrome/common/extensions/docs/server2/compiled_file_system.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import logging
+
 class _CacheEntry(object):
   def __init__(self, cache_data, version):
     self._cache_data = cache_data
     self.version = version
 
 class CompiledFileSystem(object):
   """This class caches FileSystem data that has been processed.
   """
   class Factory(object):
     """A class to build a CompiledFileSystem backed by |file_system|.
@@ skipping 70 matching lines @@
   def GetFromFile(self, path, binary=False):
     """Calls |populate_function| on the contents of the file at |path|.  If
     |binary| is True then the file will be read as binary - but this will only
     apply for the first time the file is fetched; if already cached, |binary|
     will be ignored.
     """
     version = self._file_system.Stat(path).version
     cache_entry = self._file_object_store.Get(path, time=0).Get()
     if (cache_entry is not None) and (version == cache_entry.version):
       return cache_entry._cache_data
-    cache_data = self._populate_function(
-        path,
-        self._file_system.ReadSingle(path, binary=binary))
-    self._file_object_store.Set(path, _CacheEntry(cache_data, version), time=0)
-    return cache_data
+    try:
+      cache_data = self._populate_function(
+          path,
+          self._file_system.ReadSingle(path, binary=binary))
+      self._file_object_store.Set(path,
+                                  _CacheEntry(cache_data, version),
+                                  time=0)
+      return cache_data
+    except ValueError as e:
+      logging.error('Could not get data for the file at %s: %s' % (path, e))
+      return None
 
   def GetFromFileListing(self, path):
     """Calls |populate_function| on the listing of the files at |path|.
     Assumes that the path given is to a directory.
     """
     if not path.endswith('/'):
       path += '/'
     version = self._file_system.Stat(path).version
     cache_entry = self._list_object_store.Get(path, time=0).Get()
     if (cache_entry is not None) and (version == cache_entry.version):
         return cache_entry._cache_data
     cache_data = self._populate_function(path, self._RecursiveList(path))
     self._list_object_store.Set(path, _CacheEntry(cache_data, version), time=0)
     return cache_data