Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/__init__.py @ 167:d8155c429171 v0.6

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+++++ v0.6
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 14 Mar 2019 09:37:18 +0100
parents b5ce9a8461bf
children c247a5dc35ed
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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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16 __version__ = "0.6"
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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 copy
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23
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24 from .compat import u, u2fs
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25 from .config import Configuration
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28 __all__ = ["load", "safe_load",
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29 "set_loader", "default_loaders",
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30 "Configuration"]
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32
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33 COMMENTS = [u("__comment"),
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34 u("__doc"),
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35 ]
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36 """Prefixes for comment configuration keys that are to be handled as
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37 comments
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38
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39 """
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40
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41
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42 def load(*files):
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43 """Load the given configuration files, merge them in the given order
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44 and return the resulting configuration dictionary.
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45
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46 :param files: the filenames of the configuration files to read and merge
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47 :returns: the configuration
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48 :rtype: ~configmix.config.Configuration
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49
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50 """
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51 if not files:
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52 return Configuration()
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53 else:
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54 ex = merge(None, _load_cfg_from_file(files[0]))
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55 for f in files[1:]:
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56 ex = merge(_load_cfg_from_file(f), ex)
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57 return Configuration(ex)
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59
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60 def safe_load(*files):
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61 """Analogous to :func:`load` but do merging with :func:`safe_merge`
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62 instead of :func:`merge`
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63
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64 """
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65 if not files:
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66 return Configuration()
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67 else:
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68 ex = safe_merge(None, _load_cfg_from_file(files[0]))
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69 for f in files[1:]:
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70 ex = safe_merge(_load_cfg_from_file(f), ex)
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71 return Configuration(ex)
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74 def _load_yaml(filename):
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75 from . import yaml
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76 with open(u2fs(filename), "rb") as yf:
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77 return yaml.safe_load(yf)
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80 def _load_json(filename):
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81 from . import json
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82 return json.load(filename)
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85 def _load_py(filename):
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86 from . import py
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87 return py.load(filename)
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90 def _load_ini(filename):
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91 from . import ini
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92 return ini.load(filename)
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95 default_loaders = {
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96 ".yml": _load_yaml,
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97 ".yaml": _load_yaml,
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98 ".json": _load_json,
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99 ".py": _load_py,
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100 ".ini": _load_ini
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101 }
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102 """The builtin default associations of extensions with loaders"""
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103
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104
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105 DEFAULT_LOADER = object()
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106 """Marker for the default loader for an extension.
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107
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108 To be used in :func:`set_loader`.
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109 """
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110
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111 _loaders = {}
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112 """All configured loader functions"""
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113
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114
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115 def clear_loader():
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116 """Remove all configured loader associations.
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117
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118 The :data:`default_loaders` are **not** changed.
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119
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120 """
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121 _loaders.clear()
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122
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123
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124 def set_loader(extension, loader):
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125 """Associate a filename trailer `extension` with a callable `loader` that
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126 will be called when :func:`load` encounters a file argument that ends
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127 with `extension`.
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128
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129 :param str extension: the extension to associate a loader with
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130 :param callable loader: a callable that accepts a `filename` argument and
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131 returns a parsed configuration from a given file
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132
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133 `extension` should be all lowercase because lookup in the loader database
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134 is *case-insensitive*.
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135
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136 If `loader` is :data:`DEFAULT_LOADER` then the default association
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137 from :data:`default_loaders` will be used -- if any.
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138
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139 """
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140 if loader is DEFAULT_LOADER:
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141 try:
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142 _loaders[extension] = default_loaders[extension]
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143 except KeyError:
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144 raise ValueError("no DEFAULT loader for extension: %r" % extension)
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145 else:
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146 _loaders[extension] = loader
138
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147
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148
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149 def _load_cfg_from_file(filename):
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150 fnl = filename.lower()
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151 extensions = list(_loaders.keys())
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152 extensions.sort(key=lambda x: len(x), reverse=True)
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153 for ext in extensions:
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154 if fnl.endswith(ext):
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155 return _loaders[ext](filename)
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156 else:
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157 raise ValueError("Unknown configuration file type for filename "
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158 "%r" % filename)
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159
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160
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161 if 0:
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162 #
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163 # From: https://github.com/jet9/python-yconfig/blob/master/yconfig.py
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164 # License: BSD License
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165 #
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166 def dict_merge(a, b):
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167 """Recursively merges dict's. not just simple a['key'] = b['key'], if
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168 both a and bhave a key who's value is a dict then dict_merge is called
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169 on both values and the result stored in the returned dictionary."""
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170
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171 if not isinstance(b, dict):
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172 return b
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173 result = deepcopy(a)
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174 for k, v in b.iteritems():
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175 if k in result and isinstance(result[k], dict):
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176 result[k] = dict_merge(result[k], v)
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177 else:
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178 result[k] = deepcopy(v)
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179 return result
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180
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181
144
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182 def merge(user, default, filter_comments=True):
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183 """Logically merge the configuration in `user` into `default`.
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184
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185 :param ~configmix.config.Configuration user:
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186 the new configuration that will be logically merged
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187 into `default`
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188 :param ~configmix.config.Configuration default:
110
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189 the base configuration where `user` is logically merged into
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190 :param bool filter_comments: flag whether to filter comment keys that
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191 start with any of the items in :data:`COMMENTS`
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192 :returns: `user` with the necessary amendments from `default`.
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193 If `user` is ``None`` then `default` is returned.
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194
144
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195 .. note:: The configuration in `user` is augmented/changed
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196 **inplace**.
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197
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198 The configuration in `default` will be changed **inplace**
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199 when filtering out comments (which is the default).
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200
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201 From http://stackoverflow.com/questions/823196/yaml-merge-in-python
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202
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203 """
110
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204 if user is None:
144
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205 if filter_comments:
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206 _filter_comments(default)
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207 return default
144
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208 if filter_comments:
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209 _filter_comments(user)
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210 if isinstance(user, dict) and isinstance(default, dict):
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211 for k, v in default.items():
144
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212 if filter_comments and _is_comment(k):
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213 continue
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214 if k not in user:
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215 user[k] = v
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216 else:
144
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217 user[k] = _merge(user[k], v, filter_comments)
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218 return user
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219
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220
144
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221 def _merge(user, default, filter_comments):
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222 """Recursion helper for :meth:`merge`
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223
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224 """
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225 if isinstance(user, dict) and isinstance(default, dict):
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226 for k, v in default.items():
144
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227 if filter_comments and _is_comment(k):
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228 continue
110
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229 if k not in user:
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230 user[k] = v
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231 else:
144
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232 user[k] = _merge(user[k], v, filter_comments)
110
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233 return user
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234
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235
144
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236 def safe_merge(user, default, filter_comments=True):
111
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237 """A more safe version of :func:`merge` that makes deep copies of
13
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238 the returned container objects.
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239
144
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240 Contrary to :func:`merge` no given argument is ever changed
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241 inplace. Every object from `default` is decoupled from the result
165
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242 -- so changing the `default` configuration later does not propagate
144
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243 into a merged configuration later.
111
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244
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245 """
110
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246 if user is None:
144
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247 if filter_comments:
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248 _filter_comments(default)
111
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249 return copy.deepcopy(default)
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250 user = copy.deepcopy(user)
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251 if filter_comments:
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252 _filter_comments(user)
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253 if isinstance(user, dict) and isinstance(default, dict):
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254 for k, v in default.items():
144
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255 if filter_comments and _is_comment(k):
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256 continue
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257 if k not in user:
111
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258 user[k] = copy.deepcopy(v)
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259 else:
144
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260 user[k] = _safe_merge(user[k], v, filter_comments)
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261 return user
111
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262
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263
144
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264 def _safe_merge(user, default, filter_comments):
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265 """Recursion helper for :meth:`safe_merge`
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266
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267 """
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268 if isinstance(user, dict) and isinstance(default, dict):
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269 for k, v in default.items():
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270 if filter_comments and _is_comment(k):
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271 continue
111
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272 if k not in user:
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273 user[k] = copy.deepcopy(v)
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274 else:
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275 user[k] = _safe_merge(user[k], v, filter_comments)
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276 return user
139
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277
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278
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279 def _filter_comments(d):
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280 """Recursively filter comments keys in the dict `d`.
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281
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282 Comment keys are keys that start with any of the items in
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283 :data:`COMMENTS`.
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284
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285 """
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286 if not isinstance(d, dict):
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287 return
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288 # use a copy of the keys because we change `d` while iterating
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289 for k in list(d.keys()):
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290 if _is_comment(k):
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291 del d[k]
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292 else:
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293 if isinstance(d[k], dict):
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294 _filter_comments(d[k])
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295
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296
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297 def _is_comment(k):
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298 for i in COMMENTS:
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299 if k.startswith(i):
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300 return True
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301 return False
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302
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303
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304 #
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305 # Init loader defaults
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306 #
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307 for _extension in default_loaders:
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308 set_loader(_extension, DEFAULT_LOADER)