Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/__init__.py @ 171:1ff11462a5c1

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The associations from filename extensions to parsers are "fnmatch" style patterns now. Calling "configmix.set_loader" prepends to the currently defined associations and therefore gets the highest priority.
author Franz Glasner <f.glasner@feldmann-mg.com>
date Thu, 25 Apr 2019 17:00:09 +0200
parents c247a5dc35ed
children 8138d56d7cd3
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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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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):
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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 :returns: the configuration
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50 :rtype: ~configmix.config.Configuration
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51
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52 """
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53 if not files:
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54 return Configuration()
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55 else:
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56 ex = merge(None, _load_cfg_from_file(files[0]))
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57 for f in files[1:]:
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58 ex = merge(_load_cfg_from_file(f), ex)
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59 return Configuration(ex)
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61
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62 def safe_load(*files):
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63 """Analogous to :func:`load` but do merging with :func:`safe_merge`
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64 instead of :func:`merge`
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65
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66 """
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67 if not files:
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68 return Configuration()
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69 else:
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70 ex = safe_merge(None, _load_cfg_from_file(files[0]))
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71 for f in files[1:]:
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72 ex = safe_merge(_load_cfg_from_file(f), ex)
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73 return Configuration(ex)
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76 def _load_yaml(filename):
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77 from . import yaml
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78 with open(u2fs(filename), "rb") as yf:
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79 return yaml.safe_load(yf)
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82 def _load_json(filename):
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83 from . import json
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84 return json.load(filename)
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87 def _load_py(filename):
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88 from . import py
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89 return py.load(filename)
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92 def _load_ini(filename):
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93 from . import ini
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94 return ini.load(filename)
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96
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97 _default_loaders = [
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98 ("*.yml", _load_yaml),
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99 ("*.yaml", _load_yaml),
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100 ("*.json", _load_json),
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101 ("*.py", _load_py),
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102 ("*.ini", _load_ini),
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103 ]
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104 """The builtin default associations of extensions with loaders -- in that
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105 order
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106
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107 """
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109
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110 DEFAULT_LOADER = object()
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111 """Marker for the default loader for an extension.
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112
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113 To be used in :func:`set_loader`.
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114 """
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115
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116 def get_default_loader(pattern):
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117 """Return the default loader for the :mod:`fnmatch` pattern `pattern`.
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118
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119 :raises: :class:`KeyError` if the `pattern` is not found.
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120
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121 """
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122 for pat, loader in _default_loaders:
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123 if pattern == pat:
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124 return loader
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125 else:
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126 raise KeyError("No loader for pattern %r" % pattern)
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127
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128
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129 _loaders = []
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130 """All configured loader functions"""
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132
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133 def clear_loader():
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134 """Remove all configured loader associations.
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135
171
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136 The :data:`_default_loaders` are **not** changed.
139
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137
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138 """
171
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139 del _loaders[:]
139
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140
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141
171
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142 def get_loader(pattern):
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143 """Return the default loader for the :mod:`fnmatch` pattern `pattern`.
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144
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145 :raises: :class:`KeyError` if the `pattern` is not found.
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146
171
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147 """
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148 for pat, loader in _loaders:
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149 if pattern == pat:
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150 return loader
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151 else:
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152 raise KeyError("No loader for pattern %r" % pattern)
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153
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154
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155 def set_loader(fnpattern, loader):
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156 """Associate a :mod:`fnmatch` pattern `fnpattern` with a callable
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157 `loader` that will be called when :func:`load` encounters a file
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158 argument that matches `fnpattern`.
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159
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160 :param str fnpattern: the :mod:`fnmatch` pattern to associate a loader with
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161 :param callable loader: a callable that accepts a `filename` argument and
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162 returns a parsed configuration from a given file
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163
171
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164 This function prepends to the given pattern to the currently defined
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165 associations.
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166
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167 The OS specific case-sensitivity behaviour of
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168 :func:`fnmatch.fnmatch` apply (i.e. :func:`os.path.normpath` will
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169 be called for both arguments).
141
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170
139
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171 If `loader` is :data:`DEFAULT_LOADER` then the default association
171
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172 from :data:`_default_loaders` will be used -- if any.
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173
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174 """
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175 if loader is DEFAULT_LOADER:
171
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176 for _p, _l in _default_loaders:
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177 if _p == fnpattern:
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178 _loaders.insert(0, (fnpattern, _l))
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179 break
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180 else:
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181 raise ValueError("no DEFAULT loader for pattern: %r" % fnpattern)
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182 else:
171
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183 _loaders.insert(0, (fnpattern, loader))
138
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184
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185
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186 def _load_cfg_from_file(filename):
171
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187 for _p, _l in _loaders:
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188 if fnmatch.fnmatch(filename, _p):
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189 return _l(filename)
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190 else:
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191 raise ValueError("Unknown configuration file type for filename "
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192 "%r" % filename)
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193
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194
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195 if 0:
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196 #
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197 # From: https://github.com/jet9/python-yconfig/blob/master/yconfig.py
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198 # License: BSD License
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199 #
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200 def dict_merge(a, b):
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201 """Recursively merges dict's. not just simple a['key'] = b['key'], if
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202 both a and bhave a key who's value is a dict then dict_merge is called
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203 on both values and the result stored in the returned dictionary."""
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204
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205 if not isinstance(b, dict):
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206 return b
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207 result = deepcopy(a)
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208 for k, v in b.iteritems():
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209 if k in result and isinstance(result[k], dict):
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210 result[k] = dict_merge(result[k], v)
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211 else:
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212 result[k] = deepcopy(v)
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213 return result
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214
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215
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216 def merge(user, default, filter_comments=True):
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217 """Logically merge the configuration in `user` into `default`.
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218
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219 :param ~configmix.config.Configuration user:
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220 the new configuration that will be logically merged
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221 into `default`
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222 :param ~configmix.config.Configuration default:
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223 the base configuration where `user` is logically merged into
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224 :param bool filter_comments: flag whether to filter comment keys that
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225 start with any of the items in :data:`COMMENTS`
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226 :returns: `user` with the necessary amendments from `default`.
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227 If `user` is ``None`` then `default` is returned.
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228
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229 .. note:: The configuration in `user` is augmented/changed
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230 **inplace**.
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231
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232 The configuration in `default` will be changed **inplace**
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233 when filtering out comments (which is the default).
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234
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235 From http://stackoverflow.com/questions/823196/yaml-merge-in-python
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236
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237 """
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238 if user is None:
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239 if filter_comments:
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240 _filter_comments(default)
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241 return default
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242 if filter_comments:
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243 _filter_comments(user)
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244 if isinstance(user, dict) and isinstance(default, dict):
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245 for k, v in default.items():
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246 if filter_comments and _is_comment(k):
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247 continue
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248 if k not in user:
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249 user[k] = v
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250 else:
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251 user[k] = _merge(user[k], v, filter_comments)
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252 return user
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253
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254
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255 def _merge(user, default, filter_comments):
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256 """Recursion helper for :meth:`merge`
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257
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258 """
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259 if isinstance(user, dict) and isinstance(default, dict):
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260 for k, v in default.items():
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261 if filter_comments and _is_comment(k):
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262 continue
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263 if k not in user:
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264 user[k] = v
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265 else:
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266 user[k] = _merge(user[k], v, filter_comments)
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267 return user
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268
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269
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270 def safe_merge(user, default, filter_comments=True):
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271 """A more safe version of :func:`merge` that makes deep copies of
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272 the returned container objects.
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273
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274 Contrary to :func:`merge` no given argument is ever changed
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275 inplace. Every object from `default` is decoupled from the result
165
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276 -- so changing the `default` configuration later does not propagate
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277 into a merged configuration later.
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278
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279 """
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280 if user is None:
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281 if filter_comments:
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282 _filter_comments(default)
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283 return copy.deepcopy(default)
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284 user = copy.deepcopy(user)
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285 if filter_comments:
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286 _filter_comments(user)
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287 if isinstance(user, dict) and isinstance(default, dict):
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288 for k, v in default.items():
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289 if filter_comments and _is_comment(k):
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290 continue
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291 if k not in user:
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292 user[k] = copy.deepcopy(v)
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293 else:
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294 user[k] = _safe_merge(user[k], v, filter_comments)
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295 return user
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296
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297
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298 def _safe_merge(user, default, filter_comments):
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299 """Recursion helper for :meth:`safe_merge`
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300
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301 """
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302 if isinstance(user, dict) and isinstance(default, dict):
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303 for k, v in default.items():
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304 if filter_comments and _is_comment(k):
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305 continue
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306 if k not in user:
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307 user[k] = copy.deepcopy(v)
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308 else:
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309 user[k] = _safe_merge(user[k], v, filter_comments)
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310 return user
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311
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312
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313 def _filter_comments(d):
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314 """Recursively filter comments keys in the dict `d`.
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315
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316 Comment keys are keys that start with any of the items in
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317 :data:`COMMENTS`.
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318
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319 """
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320 if not isinstance(d, dict):
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321 return
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322 # use a copy of the keys because we change `d` while iterating
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323 for k in list(d.keys()):
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324 if _is_comment(k):
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325 del d[k]
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326 else:
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327 if isinstance(d[k], dict):
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328 _filter_comments(d[k])
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329
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330
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331 def _is_comment(k):
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332 for i in COMMENTS:
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333 if k.startswith(i):
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334 return True
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335 return False
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336
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337
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338 #
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339 # Init loader defaults
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340 #
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341 for _pattern, _ld in _default_loaders:
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342 set_loader(_pattern, _ld)