Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/__init__.py @ 122:21d92ff8cf31

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Begin the handling of JSON-style configuration files
author Franz Glasner <hg@dom66.de>
date Wed, 04 Apr 2018 09:45:29 +0200
parents c50ad93eb5dc
children b883f4ef1967
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1 # -*- coding: utf-8 -*-
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2 """A library for helping with configuration files.
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3
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4 :Author: Franz Glasner
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5 :Copyright: (c) 2015–2018, Franz Glasner.
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6 All rights reserved.
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7 :License: 3-clause BSD License.
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8 See LICENSE.txt for details.
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9 :ID: $Header$
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10
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11 """
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13 from __future__ import division, print_function, absolute_import
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15
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16 __version__ = "0.6.0.dev1"
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17
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18 __revision__ = "$Revision$"
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21 import copy
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22
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23 from .config import Configuration
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25
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26 __all__ = ["load", "safe_load", "Configuration"]
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29 def load(*files):
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30 """Load the given configuration files, merge them in the given order
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31 and return the resulting configuration dictionary.
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32
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33 :param files: the filenames of the configuration files to read and merge
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34 :returns: the configuration
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35 :rtype: ~configmix.config.Configuration
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36
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37 """
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38 if not files:
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39 return Configuration()
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40 else:
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41 ex = merge(None, _load_cfg_from_file(files[0]))
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42 for f in files[1:]:
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43 ex = merge(_load_cfg_from_file(f), ex)
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44 return Configuration(ex)
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46
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47 def safe_load(*files):
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48 """Analogous to :func:`load` but do merging with :func:`safe_merge`
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49 instead of :func:`merge`
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50
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51 """
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52 if not files:
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53 return Configuration()
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54 else:
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55 ex = safe_merge(None, _load_cfg_from_file(files[0]))
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56 for f in files[1:]:
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57 ex = safe_merge(_load_cfg_from_file(f), ex)
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58 return Configuration(ex)
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61 def _load_cfg_from_file(filename):
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62 fnl = filename.lower()
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63 if fnl.endswith(".yml") or fnl.endswith("yaml"):
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64 from . import yaml
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65 with open(filename, "rb") as yf:
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66 return yaml.safe_load(yf)
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67 elif fnl.endswith(".json"):
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68 from . import json
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69 return json.load(filename)
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70 elif fnl.endswith(".py"):
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71 from . import py
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72 return py.load(filename)
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73 elif fnl.endswith(".ini"):
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74 from . import ini
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75 return ini.load(filename)
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76 else:
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77 raise ValueError("Unknown configuration file type for filename "
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78 "%r" % filename)
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80
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81 if 0:
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82 #
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83 # From: https://github.com/jet9/python-yconfig/blob/master/yconfig.py
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84 # License: BSD License
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85 #
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86 def dict_merge(a, b):
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87 """Recursively merges dict's. not just simple a['key'] = b['key'], if
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88 both a and bhave a key who's value is a dict then dict_merge is called
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89 on both values and the result stored in the returned dictionary."""
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90
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91 if not isinstance(b, dict):
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92 return b
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93 result = deepcopy(a)
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94 for k, v in b.iteritems():
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95 if k in result and isinstance(result[k], dict):
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96 result[k] = dict_merge(result[k], v)
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97 else:
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98 result[k] = deepcopy(v)
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99 return result
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101
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102 def merge(user, default):
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103 """Logically merge the configuration in `user` into `default`.
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104
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105 :param ~configmix.config.Configuration user:
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106 the new configuration that will be logically merged
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107 into `default`
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108 :param ~configmix.config.Configuration default:
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109 the base configuration where `user` is logically merged into
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110 :returns: `user` with the necessary amendments from `default`.
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111 If `user` is ``None`` then `default` is returned.
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112
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113 .. note:: The configuration in `default` is not changed but the
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114 configuration given in `user` is changed **inplace**.
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115
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116 From http://stackoverflow.com/questions/823196/yaml-merge-in-python
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117
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118 """
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119 if user is None:
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120 return default
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121 if isinstance(user, dict) and isinstance(default, dict):
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122 for k, v in default.items():
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123 if k not in user:
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124 user[k] = v
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125 else:
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126 user[k] = _merge(user[k], v)
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127 return user
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129
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130 def _merge(user, default):
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131 """Recursion helper for :meth:`merge`
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132
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133 """
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134 if isinstance(user, dict) and isinstance(default, dict):
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135 for k, v in default.items():
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136 if k not in user:
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137 user[k] = v
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138 else:
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139 user[k] = _merge(user[k], v)
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140 return user
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141
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142
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143 def safe_merge(user, default):
111
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144 """A more safe version of :func:`merge` that makes deep copies of
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145 the returned container objects.
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146
111
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147 No given argument is ever changed inplace. Every object from `default`
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148 is decoupled from the result -- so changing the `default` configuration
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149 lates does not yield into a merged configuration later.
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150
10
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151 """
110
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152 if user is None:
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153 return copy.deepcopy(default)
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154 user = copy.deepcopy(user)
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155 if isinstance(user, dict) and isinstance(default, dict):
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156 for k, v in default.items():
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157 if k not in user:
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158 user[k] = copy.deepcopy(v)
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159 else:
111
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160 user[k] = _safe_merge(user[k], v)
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161 return user
111
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162
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163
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164 def _safe_merge(user, default):
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165 """Recursion helper for :meth:`safe_merge`
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166
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167 """
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168 if isinstance(user, dict) and isinstance(default, dict):
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169 for k, v in default.items():
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170 if k not in user:
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171 user[k] = copy.deepcopy(v)
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172 else:
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173 user[k] = _safe_merge(user[k], v)
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174 return user