forked from mirrors/gecko-dev
08374b825e
MozReview-Commit-ID: IIX125xFoMx --HG-- extra : rebase_source : 1b90ae1c04bdbb156ce6fef2a6bbadd443f1416a
51 lines
1.5 KiB
Python
51 lines
1.5 KiB
Python
# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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from __future__ import absolute_import, print_function, unicode_literals
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import copy
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def merge_to(source, dest):
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'''
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Merge dict and arrays (override scalar values)
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Keys from source override keys from dest, and elements from lists in source
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are appended to lists in dest.
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:param dict source: to copy from
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:param dict dest: to copy to (modified in place)
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'''
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for key, value in source.items():
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# Override mismatching or empty types
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if type(value) != type(dest.get(key)): # noqa
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dest[key] = source[key]
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continue
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# Merge dict
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if isinstance(value, dict):
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merge_to(value, dest[key])
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continue
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if isinstance(value, list):
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dest[key] = dest[key] + source[key]
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continue
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dest[key] = source[key]
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return dest
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def merge(*objects):
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'''
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Merge the given objects, using the semantics described for merge_to, with
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objects later in the list taking precedence. From an inheritance
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perspective, "parents" should be listed before "children".
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Returns the result without modifying any arguments.
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'''
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if len(objects) == 1:
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return copy.deepcopy(objects[0])
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return merge_to(objects[-1], merge(*objects[:-1]))
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