Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/variables.py @ 697:57fe110c50c8

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Implement a new "SYS" namespace with "prefix", "base_prefix" and "platform"
author Franz Glasner <fzglas.hg@dom66.de>
date Wed, 14 Jun 2023 01:11:01 +0200
parents f454889e41fa
children 3a9d661d33b5
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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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14
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15
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16 import os
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17 import platform
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18 import sys
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19 from functools import wraps
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20
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21 from .compat import PY2, native_os_str_to_text, text_to_native_os_str, u
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22 from .constants import REF_NAMESPACE, NONE_FILTER, EMPTY_FILTER
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24
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25 _MARKER = object()
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27
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28 def _envlookup(name, default=_MARKER):
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29 """Lookup an environment variable"""
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30 try:
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31 return native_os_str_to_text(os.environ[name])
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32 except KeyError:
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33 if default is _MARKER:
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34 raise
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35 else:
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36 return default
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38
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39 def _oslookup(name, default=_MARKER):
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40 """Lookup some process and/or OS state """
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41 if name == "cwd":
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42 return native_os_str_to_text(os.getcwd())
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43 elif name == "node":
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44 return native_os_str_to_text(platform.node())
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45 else:
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46 if default is _MARKER:
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47 raise KeyError("key %r not found in the namespace" % name)
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48 else:
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49 return default
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51
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52 def _syslookup(name, default=_MARKER):
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53 """Lookup some variables from Python's :mod:`sys` module"""
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54 if name == "prefix":
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55 return native_os_str_to_text(sys.prefix)
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56 elif name == "base_prefix":
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57 val = getattr(sys, name, _MARKER)
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58 if val is _MARKER:
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59 if default is _MARKER:
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60 raise KeyError("key %r not found in the namespace" % name)
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61 else:
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62 return default
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63 return native_os_str_to_text(val)
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64 elif name == "platform":
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65 return native_os_str_to_text(sys.platform)
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66 else:
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67 if default is _MARKER:
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68 raise KeyError("key %r not found in the namespace" % name)
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69 else:
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70 return default
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71
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72
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73 def _pylookup(name, default=_MARKER):
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74 """Lookup Python specific information"""
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75 if name == "version":
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76 return u(platform.python_version())
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77 elif name == "implementation":
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78 return u(platform.python_implementation())
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79 elif name == "version_maj_min":
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80 t = platform.python_version_tuple()
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81 return u('.'.join(t[:2]))
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82 elif name == "version_maj":
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83 t = platform.python_version_tuple()
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84 return u(t[0])
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85 else:
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86 if default is _MARKER:
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87 raise KeyError("variable %r not found in namespace PY" % name)
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88 else:
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89 return default
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91
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92 _varns_registry = {}
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93 """Namespace registry"""
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94
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95
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96 def add_varns(name, fn):
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97 """Register a new variable namespace `name` and it's implementing
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98 function `fn`
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99
305
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100 ..note:: This function checks that `name` is not the special
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101 namespace :data:`~configmix.constants.REF_NAMESPACE`.
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102
106
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103 """
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104 if name == REF_NAMESPACE:
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105 raise ValueError(
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106 "the special namespace `%s' is not allowed here" % REF_NAMESPACE)
106
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107 _varns_registry[name] = fn
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108
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109
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110 def lookup_varns(name):
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111 """Lookup the variable namespace `name` and return it's implementing
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112 function
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113
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114 :param str name: the namespace name
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115 :returns: the implementing function
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116 :exception KeyError: if the namespace `name` doesn't exist
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117
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118 ..note:: This function checks that `name` is not the special
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119 namespace :data:`~configmix.constants.REF_NAMESPACE`.
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120
106
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121 """
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122 if name == REF_NAMESPACE:
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123 raise ValueError(
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124 "the special namespace `%s' is not allowed here" % REF_NAMESPACE)
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125 return _varns_registry[_normalized(name)]
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126
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127
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128 _filter_registry = {}
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129 """Filter registry"""
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130
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131
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132 def add_filter(name, fn):
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133 """Register a variable filter function with name `name` and
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134 implementation `fn`
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135
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136 """
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137 _filter_registry[_normalized(name)] = fn
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138
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139
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140 def lookup_filter(name):
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141 """Lookup a variable filter with name `name` and return it's
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142 implementation function
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143
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144 :param str name: the logical filter name
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145 :returns: the implementing filter function
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146 :exception KeyError: if the filter cannot be found
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147
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148 """
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149 return _filter_registry[_normalized(name)]
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150
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151
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152 def filter(name):
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153 """Decorator for a filter function.
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154
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155 Example usage::
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156
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157 @filter("myfilter")
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158 def myfilter_impl(appconfig, variable_value):
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159 filtered_value = ...
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160 return filtered_value
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161
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162
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163 """
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164
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165 def _decorator(f):
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166
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167 @wraps(f)
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168 def _f(appconfig, v):
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169 return f(appconfig, v)
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170
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171 add_filter(name, _f)
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172 return _f
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173
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174 return _decorator
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175
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176
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177 def _normalized(name):
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178 return name.replace('-', '_')
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179
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180
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181 #
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182 # Some pre-defined filter functions
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183 #
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184 if PY2:
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185
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186 @filter("urlquote")
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187 def urlquote(config, v):
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188 """Filter function to replace all special characters in string `v`
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189 using the ``%xx`` escape
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190
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191 """
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192 from urllib import quote
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193 return quote(v.encode("utf-8"), safe=b"").decode("utf-8")
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194
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195
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196 @filter("urlquote_plus")
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197 def urlquote_plus(config, v):
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198 """Filter function to replace all special characters (including
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199 spaces) in string `v` using the ``%xx`` escape
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200
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201 """
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202 from urllib import quote_plus
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203 return quote_plus(v.encode("utf-8"), safe=b"").decode("utf-8")
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204
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205 else:
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206
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207 @filter("urlquote")
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208 def urlquote(config, v):
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209 """Filter function to replace all special characters in string `v`
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210 using the ``%xx`` escape
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211
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212 """
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213 from urllib.parse import quote
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214 return quote(v, safe="")
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215
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216
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217 @filter("urlquote_plus")
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218 def urlquote_plus(config, v):
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219 """Filter function to replace all special characters (including
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220 spaces) in string `v` using the ``%xx`` escape
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221
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222 """
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223 from urllib.parse import quote_plus
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224 return quote_plus(v, safe="")
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225
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226
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227 @filter("saslprep")
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228 def saslprep(config, v):
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229 """Filter function to perform a `SASLprep` according to :rfc:`4013` on
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230 `v`.
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231
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232 This is a Stringprep Profile for usernames and passwords
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233
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234 """
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235 import passlib.utils
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236 return passlib.utils.saslprep(v)
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237
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238
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239 @filter("normpath")
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240 def normpath_impl(config, v):
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241 """Implementation of the `normpath` filter function"""
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242 return os.path.normpath(v)
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243
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244
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245 @filter("abspath")
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246 def abspath_impl(config, v):
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247 """Implementation of the `abspath` filter function"""
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248 return os.path.abspath(v)
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249
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250
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251 @filter("posixpath")
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252 def posixpath_impl(config, v):
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253 """Implementation of the `posixpath` filter function"""
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254 return v.replace(u('\\'), u('/'))
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255
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256
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257 @filter("lower")
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258 def lower_impl(config, v):
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259 """Implementation of the `lower` filter function"""
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260 return v.lower()
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261
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262
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263 @filter("upper")
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264 def upper_impl(config, v):
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265 """Implementation of the `upper` filter function"""
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266 return v.upper()
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267
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268
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269 @filter(text_to_native_os_str(NONE_FILTER, encoding="ascii"))
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270 def None_filter_impl(config, v):
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271 """Identity.
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272
360
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273 The `None` filter is just a marker to not throw :exc:`KeyError`
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274 but return `None`. It is a no-op within the filter-chain itself.
349
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275
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276 """
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277 return v
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278
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279
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280 @filter(text_to_native_os_str(EMPTY_FILTER, encoding="ascii"))
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281 def Empty_filter_impl(config, v):
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282 """Identity.
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283
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284 The `Empty` filter is just a marker to not throw :exc:`KeyError`
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285 but return the empty string. It is a no-op within the filter-chain itself.
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286
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287 """
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288 return v
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289
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290
106
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291 # Register the default namespaces
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292 add_varns("ENV", _envlookup)
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293 add_varns("OS", _oslookup)
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294 add_varns("PY", _pylookup)
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295 add_varns("SYS", _syslookup)
282
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296 try:
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297 from .extras import aws
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298 except ImportError:
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299 pass
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300 else:
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301 add_varns("AWS", aws._awslookup)