Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/variables.py @ 633:9ab72688278b v0.20.4

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+++++ v0.20.4
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 17 Jan 2022 09:17:30 +0100
parents f454889e41fa
children 57fe110c50c8
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1 # -*- coding: utf-8 -*-
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2 # :-
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3 # :Copyright: (c) 2015-2022, Franz Glasner. All rights reserved.
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4 # :License: BSD-3-Clause. See LICENSE.txt for details.
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5 # :-
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6 """Variable interpolation: implementation of namespaces and filters
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7
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8 """
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9
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10 from __future__ import division, absolute_import, print_function
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11
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13 __all__ = []
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15
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16 import os
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17 import platform
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18 from functools import wraps
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19
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20 from .compat import PY2, native_os_str_to_text, text_to_native_os_str, u
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21 from .constants import REF_NAMESPACE, NONE_FILTER, EMPTY_FILTER
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23
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24 _MARKER = object()
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27 def _envlookup(name, default=_MARKER):
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28 """Lookup an environment variable"""
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29 try:
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30 return native_os_str_to_text(os.environ[name])
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31 except KeyError:
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32 if default is _MARKER:
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33 raise
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34 else:
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35 return default
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38 def _oslookup(name, default=_MARKER):
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39 """Lookup some process and/or OS state """
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40 if name == "cwd":
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41 return native_os_str_to_text(os.getcwd())
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42 elif name == "node":
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43 return native_os_str_to_text(platform.node())
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44 else:
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45 if default is _MARKER:
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46 raise KeyError("key %r not found in the namespace" % name)
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47 else:
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48 return default
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51 def _pylookup(name, default=_MARKER):
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52 """Lookup Python specific information"""
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53 if name == "version":
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54 return u(platform.python_version())
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55 elif name == "implementation":
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56 return u(platform.python_implementation())
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57 elif name == "version_maj_min":
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58 t = platform.python_version_tuple()
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59 return u('.'.join(t[:2]))
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60 elif name == "version_maj":
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61 t = platform.python_version_tuple()
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62 return u(t[0])
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63 else:
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64 if default is _MARKER:
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65 raise KeyError("variable %r not found in namespace PY" % name)
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66 else:
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67 return default
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70 _varns_registry = {}
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71 """Namespace registry"""
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72
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74 def add_varns(name, fn):
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75 """Register a new variable namespace `name` and it's implementing
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76 function `fn`
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77
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78 ..note:: This function checks that `name` is not the special
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79 namespace :data:`~configmix.constants.REF_NAMESPACE`.
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80
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81 """
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82 if name == REF_NAMESPACE:
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83 raise ValueError(
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84 "the special namespace `%s' is not allowed here" % REF_NAMESPACE)
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85 _varns_registry[name] = fn
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88 def lookup_varns(name):
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89 """Lookup the variable namespace `name` and return it's implementing
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90 function
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91
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92 :param str name: the namespace name
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93 :returns: the implementing function
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94 :exception KeyError: if the namespace `name` doesn't exist
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95
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96 ..note:: This function checks that `name` is not the special
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97 namespace :data:`~configmix.constants.REF_NAMESPACE`.
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98
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99 """
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100 if name == REF_NAMESPACE:
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101 raise ValueError(
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102 "the special namespace `%s' is not allowed here" % REF_NAMESPACE)
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103 return _varns_registry[_normalized(name)]
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104
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105
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106 _filter_registry = {}
106
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107 """Filter registry"""
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108
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109
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110 def add_filter(name, fn):
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111 """Register a variable filter function with name `name` and
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112 implementation `fn`
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113
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114 """
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115 _filter_registry[_normalized(name)] = fn
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116
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117
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118 def lookup_filter(name):
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119 """Lookup a variable filter with name `name` and return it's
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120 implementation function
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121
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122 :param str name: the logical filter name
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123 :returns: the implementing filter function
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124 :exception KeyError: if the filter cannot be found
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125
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126 """
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127 return _filter_registry[_normalized(name)]
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128
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129
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130 def filter(name):
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131 """Decorator for a filter function.
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132
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133 Example usage::
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134
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135 @filter("myfilter")
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136 def myfilter_impl(appconfig, variable_value):
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137 filtered_value = ...
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138 return filtered_value
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139
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140
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141 """
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142
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143 def _decorator(f):
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144
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145 @wraps(f)
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146 def _f(appconfig, v):
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147 return f(appconfig, v)
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148
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149 add_filter(name, _f)
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150 return _f
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151
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152 return _decorator
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153
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154
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155 def _normalized(name):
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156 return name.replace('-', '_')
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157
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158
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159 #
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160 # Some pre-defined filter functions
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161 #
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162 if PY2:
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163
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164 @filter("urlquote")
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165 def urlquote(config, v):
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166 """Filter function to replace all special characters in string `v`
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167 using the ``%xx`` escape
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168
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169 """
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170 from urllib import quote
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171 return quote(v.encode("utf-8"), safe=b"").decode("utf-8")
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172
347
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173
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174 @filter("urlquote_plus")
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175 def urlquote_plus(config, v):
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176 """Filter function to replace all special characters (including
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177 spaces) in string `v` using the ``%xx`` escape
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178
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179 """
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180 from urllib import quote_plus
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181 return quote_plus(v.encode("utf-8"), safe=b"").decode("utf-8")
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182
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183 else:
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184
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185 @filter("urlquote")
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186 def urlquote(config, v):
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187 """Filter function to replace all special characters in string `v`
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188 using the ``%xx`` escape
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189
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190 """
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191 from urllib.parse import quote
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192 return quote(v, safe="")
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193
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194
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195 @filter("urlquote_plus")
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196 def urlquote_plus(config, v):
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197 """Filter function to replace all special characters (including
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198 spaces) in string `v` using the ``%xx`` escape
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199
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200 """
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201 from urllib.parse import quote_plus
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202 return quote_plus(v, safe="")
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203
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204
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205 @filter("saslprep")
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206 def saslprep(config, v):
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207 """Filter function to perform a `SASLprep` according to :rfc:`4013` on
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208 `v`.
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209
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210 This is a Stringprep Profile for usernames and passwords
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211
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212 """
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213 import passlib.utils
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214 return passlib.utils.saslprep(v)
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215
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216
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217 @filter("normpath")
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218 def normpath_impl(config, v):
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219 """Implementation of the `normpath` filter function"""
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220 return os.path.normpath(v)
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221
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222
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223 @filter("abspath")
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224 def abspath_impl(config, v):
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225 """Implementation of the `abspath` filter function"""
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226 return os.path.abspath(v)
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227
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228
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229 @filter("posixpath")
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230 def posixpath_impl(config, v):
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231 """Implementation of the `posixpath` filter function"""
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232 return v.replace(u('\\'), u('/'))
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233
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234
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235 @filter("lower")
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236 def lower_impl(config, v):
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237 """Implementation of the `lower` filter function"""
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238 return v.lower()
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239
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240
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241 @filter("upper")
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242 def upper_impl(config, v):
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243 """Implementation of the `upper` filter function"""
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244 return v.upper()
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245
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246
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247 @filter(text_to_native_os_str(NONE_FILTER, encoding="ascii"))
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248 def None_filter_impl(config, v):
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249 """Identity.
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250
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251 The `None` filter is just a marker to not throw :exc:`KeyError`
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252 but return `None`. It is a no-op within the filter-chain itself.
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253
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254 """
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255 return v
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256
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257
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258 @filter(text_to_native_os_str(EMPTY_FILTER, encoding="ascii"))
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259 def Empty_filter_impl(config, v):
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260 """Identity.
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261
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d2751a80d9b7 Docu: fix link to KeyError in the new filter function implementations
Franz Glasner <fzglas.hg@dom66.de>
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262 The `Empty` filter is just a marker to not throw :exc:`KeyError`
522
Franz Glasner <fzglas.hg@dom66.de>
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263 but return the empty string. It is a no-op within the filter-chain itself.
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2b209bdf6995 Implement the "Empty" filter.
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264
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265 """
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266 return v
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267
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268
106
b35837427a7a Add an "add_varns()" function to add new namespaces for variables.
Franz Glasner <hg@dom66.de>
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269 # Register the default namespaces
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270 add_varns("ENV", _envlookup)
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271 add_varns("OS", _oslookup)
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272 add_varns("PY", _pylookup)
282
da1596034954 Implemented an "AWS" namespace to retrieve some AWS-specific metadata
Franz Glasner <fzglas.hg@dom66.de>
parents: 250
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273 try:
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274 from .extras import aws
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275 except ImportError:
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276 pass
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277 else:
da1596034954 Implemented an "AWS" namespace to retrieve some AWS-specific metadata
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parents: 250
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278 add_varns("AWS", aws._awslookup)