1 files changed, 30 insertions, 0 deletions
diff --git a/catapult/common/py_utils/py_utils/camel_case.py b/catapult/common/py_utils/py_utils/camel_case.py
new file mode 100644
index 00000000..9a768902
--- /dev/null
+++ b/catapult/common/py_utils/py_utils/camel_case.py
@@ -0,0 +1,30 @@
+# Copyright 2013 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 re
+
+
+def ToUnderscore(obj):
+  """Converts a string, list, or dict from camelCase to lower_with_underscores.
+
+  Descends recursively into lists and dicts, converting all dict keys.
+  Returns a newly allocated object of the same structure as the input.
+  """
+  if isinstance(obj, basestring):
+    return re.sub('(?!^)([A-Z]+)', r'_\1', obj).lower()
+
+  elif isinstance(obj, list):
+    return [ToUnderscore(item) for item in obj]
+
+  elif isinstance(obj, dict):
+    output = {}
+    for k, v in obj.iteritems():
+      if isinstance(v, list) or isinstance(v, dict):
+        output[ToUnderscore(k)] = ToUnderscore(v)
+      else:
+        output[ToUnderscore(k)] = v
+    return output
+
+  else:
+    return obj