Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/__init__.py @ 178:eeb3ed104ea1

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Begin refactoring the associations between filename extensions and loader functions: Make is indirect via the file mode.
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 02 May 2019 09:42:28 +0200
parents 6dde1e344ae8
children 62db35db8939
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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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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__ = "0.7.dev1"
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17
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18 __revision__ = "|VCSRevision|"
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19 __date__ = "|VCSJustDate|"
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21 __all__ = ["load", "safe_load",
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22 "set_loader", "get_loader",
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23 "get_default_loader",
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24 "Configuration"]
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27 import fnmatch
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28 import copy
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29
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30 from .compat import u, u2fs
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31 from .config import Configuration
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33
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34 COMMENTS = [u("__comment"),
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35 u("__doc"),
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36 ]
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37 """Prefixes for comment configuration keys that are to be handled as
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38 comments
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39
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40 """
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41
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42
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43 def load(*files, **kwargs):
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44 """Load the given configuration files, merge them in the given order
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45 and return the resulting configuration dictionary.
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46
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47 :param files: the filenames of the configuration files to read and merge
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48 :keyword defaults: optional configuration dictionary with some default
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49 settings where the settings from `files` are merged
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50 into
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51 :type defaults: a configuration dictionary or `None`
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52 :returns: the configuration
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53 :rtype: ~configmix.config.Configuration
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55 """
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56 defaults = kwargs.get("defaults")
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57 if not files:
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58 if defaults is None:
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59 return Configuration()
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60 else:
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61 return Configuration(defaults)
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62 else:
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63 if defaults is None:
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64 start = 1
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65 ex = merge(None, _load_cfg_from_file(files[0]))
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66 else:
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67 start = 0
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68 ex = merge(None, defaults)
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69 for f in files[start:]:
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70 ex = merge(_load_cfg_from_file(f), ex)
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71 return Configuration(ex)
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74 def safe_load(*files, **kwargs):
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75 """Analogous to :func:`load` but do merging with :func:`safe_merge`
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76 instead of :func:`merge`
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78 """
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79 defaults = kwargs.get("defaults")
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80 if not files:
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81 if defaults is None:
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82 return Configuration()
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83 else:
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84 return Configuration(defaults)
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85 else:
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86 if defaults is None:
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87 start = 1
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88 ex = merge(None, _load_cfg_from_file(files[0]))
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89 else:
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90 start = 0
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91 ex = merge(None, defaults)
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92 ex = safe_merge(None, _load_cfg_from_file(files[0]))
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93 for f in files[start:]:
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94 ex = safe_merge(_load_cfg_from_file(f), ex)
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95 return Configuration(ex)
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98 def _load_yaml(filename):
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99 from . import yaml
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100 with open(u2fs(filename), "rb") as yf:
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101 return yaml.safe_load(yf)
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102
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103
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104 def _load_json(filename):
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105 from . import json
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106 return json.load(filename)
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108
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109 def _load_py(filename):
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110 from . import py
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111 return py.load(filename)
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113
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114 def _load_ini(filename):
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115 from . import ini
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116 return ini.load(filename)
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117
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118
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119 DEFAULT_MODE_LOADERS = {
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120 "python": _load_py,
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121 "yaml": _load_yaml,
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122 "conf": _load_ini,
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123 "conf-windows": _load_ini,
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124 "ini": _load_ini,
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125 "javascript": _load_json,
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126 "json": _load_json,
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127 }
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128 """Default associations between file modes and loader functions"""
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129
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130
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131 DEFAULT_EXTENSIONS = [
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132 ("*.yml", "yaml"),
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133 ("*.yaml", "yaml"),
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134 ("*.json", "json"),
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135 ("*.py", "python"),
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136 ("*.ini", "conf"),
171
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137 ]
178
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138 """The builtin default associations of filename extensions with
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139 file modes -- in that order.
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140
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141 The "mode" part may be a string or a callable with a filename
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142 parameter that returns the mode string for the file or `None` if it
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143 can not determined.
171
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144
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145 """
139
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146
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147
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148 DEFAULT_LOADER = object()
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149 """Marker for the default loader for an extension.
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150
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151 To be used in :func:`set_loader`.
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152 """
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153
171
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154 def get_default_loader(pattern):
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155 """Return the default loader for the :mod:`fnmatch` pattern `pattern`.
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156
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157 :raises: :class:`KeyError` if the `pattern` is not found.
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158
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159 """
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160 for pat, loader in _default_loaders:
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161 if pattern == pat:
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162 return loader
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163 else:
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164 raise KeyError("No loader for pattern %r" % pattern)
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165
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166
178
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167 _mode_loaders = {}
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168 """All configured associations between file modes and loader functions.
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169
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170 See :data:`DEFAULT_MODE_LOADERS.
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171
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172 """
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173
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174 _extensions = []
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175 """All configured assiciations of filename extensions with file modes.
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176
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177 See :data:`DEFAULT_EXTENSIONS`
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178
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179 """
139
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180
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181
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182 def clear_loader():
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183 """Remove all configured loader associations.
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184
171
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185 The :data:`_default_loaders` are **not** changed.
139
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186
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187 """
171
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188 del _loaders[:]
139
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189
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190
171
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191 def get_loader(pattern):
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192 """Return the default loader for the :mod:`fnmatch` pattern `pattern`.
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193
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194 :raises: :class:`KeyError` if the `pattern` is not found.
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195
171
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196 """
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197 for pat, loader in _loaders:
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198 if pattern == pat:
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199 return loader
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200 else:
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201 raise KeyError("No loader for pattern %r" % pattern)
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202
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203
178
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204 def set_loader(fnpattern, mode):
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205 """Associate a :mod:`fnmatch` style pattern `fnpattern` with a file
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206 mode `mode` that determines what will be called when :func:`load`
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207 encounters a file argument that matches `fnpattern`.
171
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208
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209 :param str fnpattern: the :mod:`fnmatch` pattern to associate a loader with
178
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210 :param callable mode: a mode string or a callable that accepts a
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211 `filename` argument and returns a file
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212 mode for the given file (or `None`)
139
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213
171
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214 This function prepends to the given pattern to the currently defined
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215 associations.
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216
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217 The OS specific case-sensitivity behaviour of
175
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218 :func:`fnmatch.fnmatch` applies (i.e. :func:`os.path.normpath`
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219 will be called for both arguments).
141
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220
139
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221 If `loader` is :data:`DEFAULT_LOADER` then the default association
171
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222 from :data:`_default_loaders` will be used -- if any.
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223
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224 """
178
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225 if mode is DEFAULT_LOADER:
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226 for p, m in DEFAULT_EXTENSIONS:
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227 if p == fnpattern:
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228 _extensions.insert(0, (fnpattern, m))
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229 break
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230 else:
178
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231 raise ValueError("no DEFAULT mode for pattern: %r" % fnpattern)
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232 else:
178
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233 _extensions.insert(0, (fnpattern, mode))
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b883f4ef1967 Indirectly map extensions to configuration file styles
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234
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235
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236 def _load_cfg_from_file(filename):
178
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237 for p, m in _extensions:
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238 if fnmatch.fnmatch(filename, p):
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239 if callable(m):
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240 m = m(filename)
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241 if m is None:
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242 continue
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243 return _mode_loaders[m](filename)
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244 else:
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245 raise ValueError("Unknown configuration file type for filename "
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246 "%r" % filename)
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247
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248
11
aecb36d4025f Deactivate the "dict_merge()" function from yconfig
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249 if 0:
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250 #
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251 # From: https://github.com/jet9/python-yconfig/blob/master/yconfig.py
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252 # License: BSD License
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253 #
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254 def dict_merge(a, b):
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255 """Recursively merges dict's. not just simple a['key'] = b['key'], if
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256 both a and bhave a key who's value is a dict then dict_merge is called
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257 on both values and the result stored in the returned dictionary."""
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258
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259 if not isinstance(b, dict):
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260 return b
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261 result = deepcopy(a)
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262 for k, v in b.iteritems():
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263 if k in result and isinstance(result[k], dict):
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264 result[k] = dict_merge(result[k], v)
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265 else:
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266 result[k] = deepcopy(v)
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267 return result
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268
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269
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270 def merge(user, default, filter_comments=True):
110
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271 """Logically merge the configuration in `user` into `default`.
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272
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273 :param ~configmix.config.Configuration user:
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274 the new configuration that will be logically merged
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275 into `default`
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276 :param ~configmix.config.Configuration default:
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277 the base configuration where `user` is logically merged into
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278 :param bool filter_comments: flag whether to filter comment keys that
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279 start with any of the items in :data:`COMMENTS`
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280 :returns: `user` with the necessary amendments from `default`.
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281 If `user` is ``None`` then `default` is returned.
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282
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283 .. note:: The configuration in `user` is augmented/changed
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284 **inplace**.
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285
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286 The configuration in `default` will be changed **inplace**
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287 when filtering out comments (which is the default).
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288
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289 From http://stackoverflow.com/questions/823196/yaml-merge-in-python
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290
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291 """
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292 if user is None:
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293 if filter_comments:
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294 _filter_comments(default)
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295 return default
144
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296 if filter_comments:
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297 _filter_comments(user)
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298 if isinstance(user, dict) and isinstance(default, dict):
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299 for k, v in default.items():
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300 if filter_comments and _is_comment(k):
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301 continue
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302 if k not in user:
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303 user[k] = v
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304 else:
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305 user[k] = _merge(user[k], v, filter_comments)
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306 return user
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307
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308
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309 def _merge(user, default, filter_comments):
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310 """Recursion helper for :meth:`merge`
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311
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312 """
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313 if isinstance(user, dict) and isinstance(default, dict):
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314 for k, v in default.items():
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315 if filter_comments and _is_comment(k):
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316 continue
110
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317 if k not in user:
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318 user[k] = v
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319 else:
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320 user[k] = _merge(user[k], v, filter_comments)
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321 return user
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322
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323
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324 def safe_merge(user, default, filter_comments=True):
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325 """A more safe version of :func:`merge` that makes deep copies of
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326 the returned container objects.
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327
144
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328 Contrary to :func:`merge` no given argument is ever changed
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329 inplace. Every object from `default` is decoupled from the result
165
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330 -- so changing the `default` configuration later does not propagate
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331 into a merged configuration later.
111
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332
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333 """
110
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334 if user is None:
144
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335 if filter_comments:
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336 _filter_comments(default)
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337 return copy.deepcopy(default)
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338 user = copy.deepcopy(user)
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339 if filter_comments:
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340 _filter_comments(user)
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341 if isinstance(user, dict) and isinstance(default, dict):
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342 for k, v in default.items():
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343 if filter_comments and _is_comment(k):
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344 continue
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345 if k not in user:
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346 user[k] = copy.deepcopy(v)
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347 else:
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348 user[k] = _safe_merge(user[k], v, filter_comments)
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349 return user
111
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350
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351
144
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352 def _safe_merge(user, default, filter_comments):
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353 """Recursion helper for :meth:`safe_merge`
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354
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355 """
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356 if isinstance(user, dict) and isinstance(default, dict):
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357 for k, v in default.items():
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358 if filter_comments and _is_comment(k):
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359 continue
111
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360 if k not in user:
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361 user[k] = copy.deepcopy(v)
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362 else:
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363 user[k] = _safe_merge(user[k], v, filter_comments)
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364 return user
139
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365
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366
144
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367 def _filter_comments(d):
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368 """Recursively filter comments keys in the dict `d`.
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369
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370 Comment keys are keys that start with any of the items in
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371 :data:`COMMENTS`.
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372
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373 """
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374 if not isinstance(d, dict):
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375 return
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376 # use a copy of the keys because we change `d` while iterating
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377 for k in list(d.keys()):
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378 if _is_comment(k):
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379 del d[k]
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380 else:
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381 if isinstance(d[k], dict):
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382 _filter_comments(d[k])
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383
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384
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385 def _is_comment(k):
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386 for i in COMMENTS:
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387 if k.startswith(i):
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388 return True
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389 return False
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390
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391
139
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392 #
178
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393 # Init loader defaults: mode->loader and extension->mode
139
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394 #
178
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395 _mode_loaders.update(DEFAULT_MODE_LOADERS)
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396 for _pattern, _mode in DEFAULT_EXTENSIONS:
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397 set_loader(_pattern, _mode)