Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/__init__.py @ 139:c87b0dc54e1d

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Allow custom configuration filename extensions and custom loaders that can handle custom configuration file syntax styles
author Franz Glasner <hg@dom66.de>
date Fri, 06 Apr 2018 22:28:45 +0200
parents b883f4ef1967
children 647782859ae1
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1 # -*- coding: utf-8 -*-
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2 """A library for helping with configuration files.
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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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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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26 __all__ = ["load", "safe_load",
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27 "set_loader", "default_loaders",
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28 "Configuration"]
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31 def load(*files):
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32 """Load the given configuration files, merge them in the given order
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33 and return the resulting configuration dictionary.
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34
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35 :param files: the filenames of the configuration files to read and merge
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36 :returns: the configuration
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37 :rtype: ~configmix.config.Configuration
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38
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39 """
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40 if not files:
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41 return Configuration()
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42 else:
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43 ex = merge(None, _load_cfg_from_file(files[0]))
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44 for f in files[1:]:
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45 ex = merge(_load_cfg_from_file(f), ex)
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46 return Configuration(ex)
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48
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49 def safe_load(*files):
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50 """Analogous to :func:`load` but do merging with :func:`safe_merge`
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51 instead of :func:`merge`
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52
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53 """
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54 if not files:
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55 return Configuration()
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56 else:
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57 ex = safe_merge(None, _load_cfg_from_file(files[0]))
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58 for f in files[1:]:
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59 ex = safe_merge(_load_cfg_from_file(f), ex)
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60 return Configuration(ex)
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63 def _load_yaml(filename):
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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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69 def _load_json(filename):
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70 from . import json
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71 return json.load(filename)
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74 def _load_py(filename):
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75 from . import py
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76 return py.load(filename)
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79 def _load_ini(filename):
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80 from . import ini
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81 return ini.load(filename)
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83
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84 default_loaders = {
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85 ".yml": _load_yaml,
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86 ".yaml": _load_yaml,
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87 ".json": _load_json,
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88 ".py": _load_py,
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89 ".ini": _load_ini
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90 }
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91 """The builtin default associations of extensions with loaders"""
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94 DEFAULT_LOADER = object()
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95 """Marker for the default loader for an extension.
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96
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97 To be used in :func:`set_loader`.
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98 """
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99
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100 _loaders = {}
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101 """All configured loader functions"""
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102
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103
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104 def clear_loader():
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105 """Remove all configured loader associations.
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106
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107 The :data:`default_loaders` are **not** changed.
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108
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109 """
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110 _loaders.clear()
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111
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112
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113 def set_loader(extension, loader):
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114 """Associate a filename trailer `extension` with a callable `loader` that
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115 will be called when :func:`load` encounters a file argument that ends
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116 with `extension`.
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117
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118 :param str extension: the extension to associate a loader with
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119 :param callable loader: a callable that accepts a `filename` argument and
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120 returns a parsed configuration from a given file
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121
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122 If `loader` is :data:`DEFAULT_LOADER` then the default association
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123 from :data:`default_loaders` will be used -- if any.
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124
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125 """
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126 if loader is DEFAULT_LOADER:
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127 try:
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128 _loaders[extension] = default_loaders[extension]
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129 except KeyError:
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130 raise ValueError("no DEFAULT loader for extension: %r" % extension)
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131 else:
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132 _loaders[extension] = loader
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134
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135 def _load_cfg_from_file(filename):
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136 fnl = filename.lower()
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137 extensions = list(_loaders.keys())
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138 extensions.sort(key=lambda x: len(x), reverse=True)
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139 for ext in extensions:
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140 if fnl.endswith(ext):
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141 return _loaders[ext](filename)
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142 else:
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143 raise ValueError("Unknown configuration file type for filename "
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144 "%r" % filename)
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145
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146
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147 if 0:
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148 #
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149 # From: https://github.com/jet9/python-yconfig/blob/master/yconfig.py
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150 # License: BSD License
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151 #
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152 def dict_merge(a, b):
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153 """Recursively merges dict's. not just simple a['key'] = b['key'], if
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154 both a and bhave a key who's value is a dict then dict_merge is called
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155 on both values and the result stored in the returned dictionary."""
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156
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157 if not isinstance(b, dict):
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158 return b
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159 result = deepcopy(a)
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160 for k, v in b.iteritems():
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161 if k in result and isinstance(result[k], dict):
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162 result[k] = dict_merge(result[k], v)
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163 else:
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164 result[k] = deepcopy(v)
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165 return result
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166
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167
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168 def merge(user, default):
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169 """Logically merge the configuration in `user` into `default`.
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170
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171 :param ~configmix.config.Configuration user:
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172 the new configuration that will be logically merged
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173 into `default`
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174 :param ~configmix.config.Configuration default:
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175 the base configuration where `user` is logically merged into
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176 :returns: `user` with the necessary amendments from `default`.
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177 If `user` is ``None`` then `default` is returned.
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178
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179 .. note:: The configuration in `default` is not changed but the
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180 configuration given in `user` is changed **inplace**.
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181
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182 From http://stackoverflow.com/questions/823196/yaml-merge-in-python
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183
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184 """
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185 if user is None:
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186 return default
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187 if isinstance(user, dict) and isinstance(default, dict):
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188 for k, v in default.items():
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189 if k not in user:
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190 user[k] = v
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191 else:
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192 user[k] = _merge(user[k], v)
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193 return user
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194
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195
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196 def _merge(user, default):
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197 """Recursion helper for :meth:`merge`
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198
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199 """
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200 if isinstance(user, dict) and isinstance(default, dict):
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201 for k, v in default.items():
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202 if k not in user:
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203 user[k] = v
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204 else:
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205 user[k] = _merge(user[k], v)
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206 return user
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207
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208
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209 def safe_merge(user, default):
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210 """A more safe version of :func:`merge` that makes deep copies of
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211 the returned container objects.
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212
111
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213 No given argument is ever changed inplace. Every object from `default`
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214 is decoupled from the result -- so changing the `default` configuration
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215 lates does not yield into a merged configuration later.
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216
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217 """
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218 if user is None:
111
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219 return copy.deepcopy(default)
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220 user = copy.deepcopy(user)
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221 if isinstance(user, dict) and isinstance(default, dict):
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222 for k, v in default.items():
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223 if k not in user:
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224 user[k] = copy.deepcopy(v)
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225 else:
111
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226 user[k] = _safe_merge(user[k], v)
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227 return user
111
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228
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229
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230 def _safe_merge(user, default):
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231 """Recursion helper for :meth:`safe_merge`
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232
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233 """
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234 if isinstance(user, dict) and isinstance(default, dict):
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235 for k, v in default.items():
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236 if k not in user:
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237 user[k] = copy.deepcopy(v)
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238 else:
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239 user[k] = _safe_merge(user[k], v)
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240 return user
139
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241
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242
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243 #
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244 # Init loader defaults
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245 #
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246 for _extension in default_loaders:
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247 set_loader(_extension, DEFAULT_LOADER)