Doc server manifest page generation

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

+# Copyright (c) 2012 The Chromium Authors. All rights reserved.

[not at google - send to devlin, 2013/04/30 16:21:09]

(c) 2012 -> 2013. Check other files too.

[jshumway, 2013/05/03 03:44:39]

Correct in new file.

+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import os
+
+class CompiledFileSystemSource(object):

[not at google - send to devlin, 2013/04/30 16:21:09]

Anything more complicated than the Identity function here would certainly call
for a specialised data source, so if anything this should be IdentityDataSource.

However, it's just as likely that we'll want to modify the data in some way - so
I'd prefer creating a separate ManifestDataSource rather than trying to be
generic.

When you do that, write some basic unit test for ManifestDataSource (see comment
in template data source test).

[jshumway, 2013/05/03 03:44:39]

I replaced this class with ManifestDataSource. It isn't trivial enough for an
IdentityDataSource, but isn't complicated enough that adding unit tests would
actually test anything.

[not at google - send to devlin, 2013/05/03 15:56:24]

Any amount of > 0 triviality is worth testing, and it's > 0 triviality. Besides
which it's nice to set things up for later tests anyway.

[jshumway, 2013/05/10 02:08:36]

Done.

+  """ Exposes a CompiledFileSystem to a template.
+  """
+  def __init__(self, compiled_fs, basepath, transformer):
+    """ |transformer| is a function that takes one argument, the key a template
+    is looking up, and returns a new key. |basepath| is then prepended to the
+    new key and the result is used to lookup a document in |complied_fs|.
+    """
+    self.compiled_fs = compiled_fs
+    self.basepath = basepath
+    self.transformer = transformer
+
+  def get(self, key):
+    return self.compiled_fs.GetFromFile(
+      os.path.join(self.basepath, self.transformer(key)))