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# 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
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