Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/__init__.py @ 13:24ba462b9b4b

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Return the `default' argument when the given `user' argument is `None' and when it is the first call on merge
author Franz Glasner <f.glasner@feldmann-mg.com>
date Wed, 09 Mar 2016 11:43:18 +0100
parents aecb36d4025f
children 6a91db2c2469
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1 # -*- coding: utf-8 -*-
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2 r"""
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3
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4 :Author: Franz Glasner
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5 :License: BSD License.
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6 See LICENSE for details.
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7
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8 """
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9
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10 from __future__ import division, print_function, absolute_import
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13 __version__ = "0.0.dev0"
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16 import copy
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17
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18
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19 __all__ = []
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22 if 0:
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23 #
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24 # From: https://github.com/jet9/python-yconfig/blob/master/yconfig.py
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25 # License: BSD License
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26 #
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27 def dict_merge(a, b):
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28 """Recursively merges dict's. not just simple a['key'] = b['key'], if
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29 both a and bhave a key who's value is a dict then dict_merge is called
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30 on both values and the result stored in the returned dictionary."""
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31
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32 if not isinstance(b, dict):
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33 return b
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34 result = deepcopy(a)
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35 for k, v in b.iteritems():
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36 if k in result and isinstance(result[k], dict):
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37 result[k] = dict_merge(result[k], v)
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38 else:
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39 result[k] = deepcopy(v)
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40 return result
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42
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43 def merge(user, default, _first=True):
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44 """A simple (YAML-)tree merge.
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45
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46 From http://stackoverflow.com/questions/823196/yaml-merge-in-python
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47
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48 .. note:: `_first` is an internal argument.
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49
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50 """
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51 if _first and (user is None):
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52 return default
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53 if isinstance(user, dict) and isinstance(default, dict):
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54 for k, v in default.items():
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55 if k not in user:
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56 user[k] = v
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57 else:
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58 user[k] = merge(user[k], v, False)
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59 return user
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62 def safe_merge(user, default, _first=True):
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63 """A more safe version of `merge()` that makes shallow copies of
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64 the returned container objects.
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66 .. note:: `_first` is an internal argument.
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68 """
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69 if _first and (user is None):
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70 return copy.copy(default)
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71 user = copy.copy(user)
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72 if isinstance(user, dict) and isinstance(default, dict):
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73 for k, v in default.items():
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74 if k not in user:
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75 user[k] = copy.copy(v)
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76 else:
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77 user[k] = merge(user[k], v, False)
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78 return user