Merge pull request #6096 from edx/jarv/config-refactor-wip

Jarv/config refactor wip

common/djangoapps/util/config_parse.py

@@ -0,0 +1,26 @@
+"""
+Helper functions for configuration parsing
+"""
+import collections
+
+
+def convert_tokens(tokens):
+    """
+    This function is called on the token
+    dictionary that is imported from a yaml file.
+    It returns a new dictionary where
+    all strings containing 'None' are converted
+    to a literal None due to a bug in Ansible
+    """
+
+    if tokens == 'None':
+        return None
+    elif isinstance(tokens, basestring) or (not isinstance(tokens, collections.Iterable)):
+        return tokens
+    elif isinstance(tokens, dict):
+        return {
+            convert_tokens(k): convert_tokens(v)
+            for k, v in tokens.items()
+        }
+    else:
+        return [convert_tokens(v) for v in tokens]