| # Copyright (C) 2019 The Android Open Source Project |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| import copy |
| |
| |
| def left_outer_join(dict_a, dict_b): |
| merged_dict = copy.deepcopy(dict_a) |
| merged_dict = _recursive_left_outer_join(merged_dict, dict_b) |
| |
| return merged_dict |
| |
| |
| def _recursive_left_outer_join(dict_a, dict_b): |
| for key, value in dict_a.items(): |
| if key not in dict_b: |
| continue |
| if isinstance(value, dict): |
| if not isinstance(dict_b[key], dict): |
| raise ValueError("Expected dictionary as value of key '%s'" % key) |
| dict_a[key] = _recursive_left_outer_join(value, dict_b[key]) |
| else: |
| dict_a[key] = dict_b[key] |
| |
| return dict_a |
