Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/__init__.py @ 174:e2505f524ab9

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Use the "@(#)" sigil in the package documentation header
author Franz Glasner <f.glasner@feldmann-mg.com>
date Fri, 26 Apr 2019 18:11:03 +0200
parents b3ba2b0265b5
children 327032bb0f6b
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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) 2015–2019, 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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14
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15
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16 __version__ = "0.7.dev1"
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17
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18 __revision__ = "|VCSRevision|"
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19 __date__ = "|VCSJustDate|"
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22 import fnmatch
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23 import copy
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24
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25 from .compat import u, u2fs
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26 from .config import Configuration
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29 __all__ = ["load", "safe_load",
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30 "set_loader", "get_loader",
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31 "get_default_loader",
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32 "Configuration"]
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34
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35 COMMENTS = [u("__comment"),
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36 u("__doc"),
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37 ]
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38 """Prefixes for comment configuration keys that are to be handled as
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39 comments
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40
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41 """
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42
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43
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44 def load(*files, **kwargs):
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45 """Load the given configuration files, merge them in the given order
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46 and return the resulting configuration dictionary.
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47
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48 :param files: the filenames of the configuration files to read and merge
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49 :keyword defaults: optional configuration dictionary with some default
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50 settings where the settings from `files` are merged
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51 into
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52 :type defaults: a configuration dictionary or `None`
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53 :returns: the configuration
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54 :rtype: ~configmix.config.Configuration
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56 """
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57 defaults = kwargs.get("defaults")
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58 if not files:
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59 if defaults is None:
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60 return Configuration()
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61 else:
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62 return Configuration(defaults)
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63 else:
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64 if defaults is None:
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65 start = 1
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66 ex = merge(None, _load_cfg_from_file(files[0]))
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67 else:
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68 start = 0
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69 ex = merge(None, defaults)
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70 for f in files[start:]:
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71 ex = merge(_load_cfg_from_file(f), ex)
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72 return Configuration(ex)
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75 def safe_load(*files, **kwargs):
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76 """Analogous to :func:`load` but do merging with :func:`safe_merge`
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77 instead of :func:`merge`
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79 """
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80 defaults = kwargs.get("defaults")
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81 if not files:
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82 if defaults is None:
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83 return Configuration()
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84 else:
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85 return Configuration(defaults)
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86 else:
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87 if defaults is None:
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88 start = 1
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89 ex = merge(None, _load_cfg_from_file(files[0]))
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90 else:
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91 start = 0
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92 ex = merge(None, defaults)
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93 ex = safe_merge(None, _load_cfg_from_file(files[0]))
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94 for f in files[start:]:
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95 ex = safe_merge(_load_cfg_from_file(f), ex)
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96 return Configuration(ex)
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98
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99 def _load_yaml(filename):
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100 from . import yaml
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101 with open(u2fs(filename), "rb") as yf:
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102 return yaml.safe_load(yf)
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103
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104
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105 def _load_json(filename):
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106 from . import json
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107 return json.load(filename)
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110 def _load_py(filename):
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111 from . import py
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112 return py.load(filename)
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114
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115 def _load_ini(filename):
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116 from . import ini
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117 return ini.load(filename)
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118
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119
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120 _default_loaders = [
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121 ("*.yml", _load_yaml),
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122 ("*.yaml", _load_yaml),
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123 ("*.json", _load_json),
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124 ("*.py", _load_py),
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125 ("*.ini", _load_ini),
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126 ]
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127 """The builtin default associations of extensions with loaders -- in that
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128 order
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129
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130 """
139
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131
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132
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133 DEFAULT_LOADER = object()
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134 """Marker for the default loader for an extension.
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135
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136 To be used in :func:`set_loader`.
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137 """
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138
171
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139 def get_default_loader(pattern):
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140 """Return the default loader for the :mod:`fnmatch` pattern `pattern`.
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141
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142 :raises: :class:`KeyError` if the `pattern` is not found.
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143
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144 """
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145 for pat, loader in _default_loaders:
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146 if pattern == pat:
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147 return loader
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148 else:
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149 raise KeyError("No loader for pattern %r" % pattern)
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150
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151
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152 _loaders = []
139
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153 """All configured loader functions"""
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154
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155
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156 def clear_loader():
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157 """Remove all configured loader associations.
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158
171
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159 The :data:`_default_loaders` are **not** changed.
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160
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161 """
171
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162 del _loaders[:]
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163
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164
171
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165 def get_loader(pattern):
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166 """Return the default loader for the :mod:`fnmatch` pattern `pattern`.
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167
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168 :raises: :class:`KeyError` if the `pattern` is not found.
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169
171
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170 """
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171 for pat, loader in _loaders:
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172 if pattern == pat:
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173 return loader
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174 else:
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175 raise KeyError("No loader for pattern %r" % pattern)
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176
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177
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178 def set_loader(fnpattern, loader):
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179 """Associate a :mod:`fnmatch` pattern `fnpattern` with a callable
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180 `loader` that will be called when :func:`load` encounters a file
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181 argument that matches `fnpattern`.
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182
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183 :param str fnpattern: the :mod:`fnmatch` pattern to associate a loader with
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184 :param callable loader: a callable that accepts a `filename` argument and
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185 returns a parsed configuration from a given file
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186
171
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187 This function prepends to the given pattern to the currently defined
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188 associations.
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189
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190 The OS specific case-sensitivity behaviour of
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191 :func:`fnmatch.fnmatch` apply (i.e. :func:`os.path.normpath` will
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192 be called for both arguments).
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193
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194 If `loader` is :data:`DEFAULT_LOADER` then the default association
171
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195 from :data:`_default_loaders` will be used -- if any.
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196
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197 """
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198 if loader is DEFAULT_LOADER:
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199 for _p, _l in _default_loaders:
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200 if _p == fnpattern:
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201 _loaders.insert(0, (fnpattern, _l))
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202 break
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203 else:
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204 raise ValueError("no DEFAULT loader for pattern: %r" % fnpattern)
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205 else:
171
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206 _loaders.insert(0, (fnpattern, loader))
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207
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208
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209 def _load_cfg_from_file(filename):
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210 for _p, _l in _loaders:
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211 if fnmatch.fnmatch(filename, _p):
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212 return _l(filename)
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213 else:
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214 raise ValueError("Unknown configuration file type for filename "
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215 "%r" % filename)
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216
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217
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218 if 0:
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219 #
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220 # From: https://github.com/jet9/python-yconfig/blob/master/yconfig.py
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221 # License: BSD License
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222 #
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223 def dict_merge(a, b):
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224 """Recursively merges dict's. not just simple a['key'] = b['key'], if
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225 both a and bhave a key who's value is a dict then dict_merge is called
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226 on both values and the result stored in the returned dictionary."""
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227
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228 if not isinstance(b, dict):
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229 return b
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230 result = deepcopy(a)
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231 for k, v in b.iteritems():
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232 if k in result and isinstance(result[k], dict):
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233 result[k] = dict_merge(result[k], v)
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234 else:
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235 result[k] = deepcopy(v)
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236 return result
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237
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238
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239 def merge(user, default, filter_comments=True):
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240 """Logically merge the configuration in `user` into `default`.
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241
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242 :param ~configmix.config.Configuration user:
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243 the new configuration that will be logically merged
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244 into `default`
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245 :param ~configmix.config.Configuration default:
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246 the base configuration where `user` is logically merged into
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247 :param bool filter_comments: flag whether to filter comment keys that
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248 start with any of the items in :data:`COMMENTS`
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249 :returns: `user` with the necessary amendments from `default`.
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250 If `user` is ``None`` then `default` is returned.
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251
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252 .. note:: The configuration in `user` is augmented/changed
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253 **inplace**.
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254
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255 The configuration in `default` will be changed **inplace**
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256 when filtering out comments (which is the default).
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257
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258 From http://stackoverflow.com/questions/823196/yaml-merge-in-python
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259
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260 """
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261 if user is None:
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262 if filter_comments:
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263 _filter_comments(default)
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264 return default
144
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265 if filter_comments:
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266 _filter_comments(user)
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267 if isinstance(user, dict) and isinstance(default, dict):
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268 for k, v in default.items():
144
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269 if filter_comments and _is_comment(k):
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270 continue
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271 if k not in user:
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272 user[k] = v
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273 else:
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274 user[k] = _merge(user[k], v, filter_comments)
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275 return user
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276
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277
144
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278 def _merge(user, default, filter_comments):
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279 """Recursion helper for :meth:`merge`
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280
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281 """
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282 if isinstance(user, dict) and isinstance(default, dict):
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283 for k, v in default.items():
144
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284 if filter_comments and _is_comment(k):
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285 continue
110
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286 if k not in user:
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287 user[k] = v
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288 else:
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289 user[k] = _merge(user[k], v, filter_comments)
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290 return user
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291
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292
144
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293 def safe_merge(user, default, filter_comments=True):
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294 """A more safe version of :func:`merge` that makes deep copies of
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295 the returned container objects.
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296
144
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297 Contrary to :func:`merge` no given argument is ever changed
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298 inplace. Every object from `default` is decoupled from the result
165
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299 -- so changing the `default` configuration later does not propagate
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300 into a merged configuration later.
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301
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302 """
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303 if user is None:
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304 if filter_comments:
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305 _filter_comments(default)
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306 return copy.deepcopy(default)
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307 user = copy.deepcopy(user)
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308 if filter_comments:
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309 _filter_comments(user)
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310 if isinstance(user, dict) and isinstance(default, dict):
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311 for k, v in default.items():
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312 if filter_comments and _is_comment(k):
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313 continue
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314 if k not in user:
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315 user[k] = copy.deepcopy(v)
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316 else:
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317 user[k] = _safe_merge(user[k], v, filter_comments)
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318 return user
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319
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320
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321 def _safe_merge(user, default, filter_comments):
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322 """Recursion helper for :meth:`safe_merge`
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323
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324 """
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325 if isinstance(user, dict) and isinstance(default, dict):
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326 for k, v in default.items():
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327 if filter_comments and _is_comment(k):
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328 continue
111
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329 if k not in user:
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330 user[k] = copy.deepcopy(v)
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331 else:
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332 user[k] = _safe_merge(user[k], v, filter_comments)
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333 return user
139
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334
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335
144
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336 def _filter_comments(d):
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337 """Recursively filter comments keys in the dict `d`.
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338
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339 Comment keys are keys that start with any of the items in
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340 :data:`COMMENTS`.
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341
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342 """
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343 if not isinstance(d, dict):
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344 return
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345 # use a copy of the keys because we change `d` while iterating
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346 for k in list(d.keys()):
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347 if _is_comment(k):
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348 del d[k]
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349 else:
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350 if isinstance(d[k], dict):
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351 _filter_comments(d[k])
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352
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353
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354 def _is_comment(k):
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355 for i in COMMENTS:
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356 if k.startswith(i):
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357 return True
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358 return False
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359
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360
139
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361 #
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362 # Init loader defaults
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363 #
171
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364 for _pattern, _ld in _default_loaders:
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365 set_loader(_pattern, _ld)