Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/variables.py @ 245:efc9674fc549 v0.7.4

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+++++ v0.7.4
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 21 May 2020 09:56:45 +0200
parents 57ff12610dc5
children ff964825a75a
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1 # -*- coding: utf-8 -*-
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2 # :-
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3 # :Copyright: (c) 2015-2020, Franz Glasner. All rights reserved.
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4 # :License: 3-clause BSD. 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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8 """
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9
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10 from __future__ import division, absolute_import, print_function
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12 import os
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13 import platform
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14 from functools import wraps
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15
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16 from .compat import PY2, native_os_str_to_text, u
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19 __all__ = []
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22 _MARKER = object()
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25 def _envlookup(name, default=_MARKER):
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26 """Lookup an environment variable"""
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27 try:
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28 return native_os_str_to_text(os.environ[name])
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29 except KeyError:
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30 if default is _MARKER:
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31 raise
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32 else:
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33 return default
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36 def _oslookup(name, default=_MARKER):
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37 """Lookup some process and/or OS state """
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38 if name == "cwd":
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39 return native_os_str_to_text(os.getcwd())
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40 elif name == "node":
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41 return native_os_str_to_text(platform.node())
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42 else:
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43 if default is _MARKER:
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44 raise KeyError("key %r not found in the namespace" % name)
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45 else:
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46 return default
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48
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49 def _pylookup(name, default=_MARKER):
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50 """Lookup Python specific information"""
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51 if name == "version":
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52 return u(platform.python_version())
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53 elif name == "implementation":
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54 return u(platform.python_implementation())
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55 elif name == "version_maj_min":
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56 t = platform.python_version_tuple()
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57 return u('.'.join(t[:2]))
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58 elif name == "version_maj":
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59 t = platform.python_version_tuple()
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60 return u(t[0])
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61 else:
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62 if default is _MARKER:
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63 raise KeyError("variable %r not found in namespace PY" % name)
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64 else:
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65 return default
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68 _varns_registry = {}
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69 """Namespace registry"""
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72 def add_varns(name, fn):
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73 """Register a new variable namespace `name` and it's implementing
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74 function `fn`
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75
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76 """
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77 _varns_registry[name] = fn
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80 def lookup_varns(name):
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81 """Lookup the variable namespace `name` and return it's implementing
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82 function
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83
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84 :param str name: the namespace name
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85 :returns: the implementing function
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86 :exception KeyError: if the namespace `name` doesn't exist
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87
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88 """
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89 return _varns_registry[_normalized(name)]
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91
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92 _filter_registry = {}
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93 """Filter registry"""
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96 def add_filter(name, fn):
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97 """Register a variable filter function with name `name` and
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98 implementation `fn`
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99
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100 """
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101 _filter_registry[_normalized(name)] = fn
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102
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103
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104 def lookup_filter(name):
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105 """Lookup a variable filter with name `name` and return it's
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106 implementation function
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107
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108 :param str name: the logical filter name
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109 :returns: the implementing filter function
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110 :exception KeyError: if the filter cannot be found
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111
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112 """
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113 return _filter_registry[_normalized(name)]
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114
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115
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116 def filter(name):
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117 """Decorator for a filter function.
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118
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119 Example usage::
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120
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121 @filter("myfilter")
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122 def myfilter_impl(appconfig, variable_value):
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123 filtered_value = ...
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124 return filtered_value
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125
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127 """
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128
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129 def _decorator(f):
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130
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131 @wraps(f)
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132 def _f(appconfig, v):
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133 return f(appconfig, v)
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134
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135 add_filter(name, _f)
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136 return _f
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137
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138 return _decorator
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139
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140
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141 def _normalized(name):
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142 return name.replace('-', '_')
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143
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144
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145 #
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146 # Some pre-defined filter functions
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147 #
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148 if PY2:
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149
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150 @filter("urlquote")
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151 def urlquote(config, v):
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152 """Filter function to replace all special characters in string using
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153 the ``%xx`` escape
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154
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155 """
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156 from urllib import quote
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157 return quote(v.encode("utf-8"), safe=b"").decode("utf-8")
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158
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159 else:
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160
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161 @filter("urlquote")
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162 def urlquote(config, v):
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163 """Filter function to replace all special characters in string using
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164 the ``%xx`` escape
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165
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166 """
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167 from urllib.parse import quote
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168 return quote(v, safe="")
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169
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170
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171 @filter("saslprep")
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172 def saslprep(config, v):
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173 """Filter function to perform a `SASLprep` according to :rfc:`4013` on
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174 `v`.
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175
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176 This is a Stringprep Profile for usernames and passwords
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177
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178 """
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179 import passlib.utils
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180 return passlib.utils.saslprep(v)
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181
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182
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183 @filter("normpath")
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184 def normpath_impl(config, v):
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185 """Implementation of the `normpath` filter function"""
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186 return os.path.normpath(v)
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187
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188
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189 @filter("abspath")
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190 def abspath_impl(config, v):
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191 """Implementation of the `abspath` filter function"""
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192 return os.path.abspath(v)
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193
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194
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195 @filter("posixpath")
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196 def posixpath_impl(config, v):
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197 """Implementation of the `posixpath` filter function"""
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198 return v.replace(u('\\'), u('/'))
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199
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200
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201 @filter("lower")
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202 def lower_impl(config, v):
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203 """Implementation of the `lower` filter function"""
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204 return v.lower()
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205
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206
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207 @filter("upper")
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208 def upper_impl(config, v):
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209 """Implementation of the `upper` filter function"""
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210 return v.upper()
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211
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212
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213 # Register the default namespaces
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214 add_varns("ENV", _envlookup)
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215 add_varns("OS", _oslookup)
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216 add_varns("PY", _pylookup)