annotate configmix/config.py @ 316:fe2e28e5fd08

Docu: first short notes about configuration tree references
author Franz Glasner <fzglas.hg@dom66.de>
date Wed, 05 May 2021 09:22:00 +0200
parents 043a6412be3c
children 98490375d90c
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1 # -*- coding: utf-8 -*-
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2 # :-
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3 # :Copyright: (c) 2015-2021, Franz Glasner. All rights reserved.
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eed16a1ec8f3 Use SPDX license identifiers (either full or short) all over the package
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4 # :License: BSD-3-Clause. See LICENSE.txt for details.
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5 # :-
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6 """The unified configuration dictionary with attribute support or
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7 variable substitution.
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8
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9 """
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10
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11 from __future__ import division, absolute_import, print_function
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12
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13
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14 __all__ = ["Configuration"]
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15
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16
39
8715e5cc59ac Print a warning if a variable cannot be expanded.
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17 import warnings
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18 try:
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19 from collections import OrderedDict as ConfigurationBase
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20 except ImportError:
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21 try:
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22 from ordereddict import OrderedDict as ConfigurationBase
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23 except ImportError:
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24 ConfigurationBase = dict
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25 try:
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26 from urllib.parse import urlsplit
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27 except ImportError:
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28 from urlparse import urlsplit
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29
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30 from .variables import lookup_varns, lookup_filter
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31 from .compat import u
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32 from .constants import REF_NAMESPACE
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35 _MARKER = object()
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36
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37
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38 class _AttributeDict(ConfigurationBase):
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40 def __getattr__(self, name):
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41 try:
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42 v = self[name]
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43 except KeyError:
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44 raise AttributeError("%s has no attribute %r" % (type(self), name))
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45 else:
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46 # Wrap a dict into another dict with attribute access support
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47 if isinstance(v, dict):
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48 return _AttributeDict(v)
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49 else:
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50 return v
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51
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52
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53 class Configuration(_AttributeDict):
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55 """The configuration dictionary with attribute support or
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56 variable substitution.
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57
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58 .. note:: When retriving by attribute names variables will *not*
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59 substituted.
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60
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61 """
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62
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63 # Speed
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64 _TEXTTYPE = type(u(""))
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65 _STARTTOK = u(b"{{")
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66 _ENDTOK = u(b"}}")
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67 _HIER_SEPARATOR = u(b'.')
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68 _NS_SEPARATOR = u(b':')
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69 _FILTER_SEPARATOR = u(b'|')
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70 _STARTTOK_REF = _STARTTOK + REF_NAMESPACE + _NS_SEPARATOR
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71 _ENDTOK_REF = _ENDTOK
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72 _DOT = u(b'.')
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73
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74 def getvarl(self, *names, default=_MARKER, namespace=None):
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75 """Get a variable where the hierarchy is given in `names` as sequence
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76 and the namespace is given in `namespace`.
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78 No variable interpolation is done and no filters are applied.
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79
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80 """
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81 try:
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82 if not namespace:
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83 lookupfn = self._lookupvar
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84 else:
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85 if namespace == REF_NAMESPACE:
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86 lookupfn = self._lookupref
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87 else:
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88 lookupfn = lookup_varns(namespace)
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89 varvalue = lookupfn(*names)
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90 except KeyError:
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91 if default is _MARKER:
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92 raise KeyError("Variable %r not found" % (names,))
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93 else:
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94 return default
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95 else:
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96 return varvalue
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97
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98 def getvar(self, varname, default=_MARKER):
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99 """Get a variable of the form ``[ns:][[key1.]key2.]name`` - including
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100 variables from other namespaces.
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101
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102 No variable interpolation is done and no filters are applied.
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103
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104 """
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105 varns, varname = self._split_ns(varname)
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106 if not varns:
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107 varnameparts = varname.split(self._HIER_SEPARATOR)
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108 else:
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109 varnameparts = (varname,)
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110 return self.getvarl(*varnameparts, namespace=varns)
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111
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112 def getvarl_s(self, *names, default=_MARKER, namespace=None):
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113 """Get a variable - including variables from other namespaces.
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114
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115 `names` and `namespace` are interpreted as in
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116 :meth:`.getvarl`. But variables will be interpolated
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117 recursively within the variable values and filters are
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118 applied.
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119
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120 For more details see chapter :ref:`variable-interpolation`.
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121
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122 """
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123 try:
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124 obj = self.getvarl(*names, namespace=namespace)
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125 return self.substitute_variables_in_obj(obj)
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126 except KeyError:
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127 if default is _MARKER:
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128 raise
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129 else:
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130 return default
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131
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132 def getvar_s(self, varname, default=_MARKER):
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133 """Get a variable - including variables from other namespaces.
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134
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135 `varname` is interpreted as in :meth:`.getvar`. But variables
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136 will be interpolated recursively within the variable values
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137 and filters are applied.
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138
202
2e66178a09d8 Docu: Ban "keyword expansion" -- use "variable interpolation" instead
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139 For more details see chapter :ref:`variable-interpolation`.
115
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140
16
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141 """
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142 try:
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143 obj = self.getvar(varname)
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144 return self.substitute_variables_in_obj(obj)
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145 except KeyError:
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146 if default is _MARKER:
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147 raise
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148 else:
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149 return default
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150
314
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151 def getintvarl_s(self, *names, default=_MARKER, namespace=None):
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152 """Get a (possibly substituted) variable and coerce text to a
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153 number.
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154
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155 """
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156 s = self.getvarl_s(*names, default=default, namespace=namespace)
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157 if isinstance(s, self._TEXTTYPE):
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158 return int(s, 0)
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159 else:
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160 return s
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161
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162 def getintvar_s(self, varname, default=_MARKER):
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163 """Get a (possibly substituted) variable and coerce text to a
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164 number.
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165
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166 """
314
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167 s = self.getvar_s(varname, default=default)
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168 if isinstance(s, self._TEXTTYPE):
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169 return int(s, 0)
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170 else:
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171 return s
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172
314
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173 def getboolvarl_s(self, *names, default=_MARKER, namespace=None):
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174 """Get a (possibly substituted) variable and convert text to a
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175 boolean
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176
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177 """
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178 s = self.getvarl_s(*names, default=default, namespace=namespace)
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179 if isinstance(s, self._TEXTTYPE):
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180 sl = s.strip().lower()
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181 if sl not in self._BOOL_CVT:
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182 raise ValueError("Not a boolean: %r" % s)
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183 return self._BOOL_CVT[sl]
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184 else:
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185 return s
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186
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187 def getboolvar_s(self, varname, default=_MARKER):
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188 """Get a (possibly substituted) variable and convert text to a
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189 boolean
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190
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191 """
314
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192 s = self.getvar_s(varname, default=default)
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193 if isinstance(s, self._TEXTTYPE):
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194 sl = s.strip().lower()
207
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195 if sl not in self._BOOL_CVT:
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196 raise ValueError("Not a boolean: %r" % s)
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197 return self._BOOL_CVT[sl]
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198 else:
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199 return s
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200
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201 # Conversion of booleans
304
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202 _BOOL_CVT = {
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203 u('1'): True, u('yes'): True, u('true'): True, u('on'): True,
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204 u('0'): False, u('no'): False, u('false'): False, u('off'): False
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205 }
36
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206
314
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207 def getfloatvarl_s(self, *names, default=_MARKER, namespace=None):
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208 """Get a (possibly substituted) variable and convert text to a
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209 float
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210
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211 """
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212 s = self.getvarl_s(*names, default=default, namespace=namespace)
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213 if isinstance(s, self._TEXTTYPE):
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214 return float(s)
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215 else:
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216 return s
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217
36
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218 def getfloatvar_s(self, varname, default=_MARKER):
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219 """Get a (possibly substituted) variable and convert text to a
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220 float
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221
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222 """
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223 s = self.getvar_s(varname, default)
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224 if isinstance(s, self._TEXTTYPE):
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225 return float(s)
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226 else:
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227 return s
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228
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229 def _split_ns(self, s):
305
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230 nameparts = s.split(self._NS_SEPARATOR, 1)
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231 if len(nameparts) == 1:
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232 return (None, s, )
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233 else:
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234 return (nameparts[0], nameparts[1], )
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235
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236 def _split_filters(self, s):
305
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237 nameparts = s.split(self._FILTER_SEPARATOR)
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238 if len(nameparts) == 1:
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239 return (s, [], )
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240 else:
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241 return (nameparts[0].rstrip(), nameparts[1:], )
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242
314
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243 def _lookupvar(self, *names, default=_MARKER):
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244 """Lookup a variable within a hierarchy.
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245
314
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246 If no default is given an unexisting `name` raises a `KeyError`
16
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247 else `default` is returned.
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248 """
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249 try:
314
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250 v = self.expand_if_reference(self[names[0]])
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251 for p in names[1:]:
305
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252 v = self.expand_if_reference(v[p])
104
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diff changeset
253 except TypeError:
207
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254 raise KeyError(
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255 "Configuration variable %r not found"
314
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256 "(missing intermediate keys?)" % (names,))
16
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257 except KeyError:
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258 if default is _MARKER:
314
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259 raise KeyError(
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260 "Configuration variable %r not found" % (names,))
16
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261 else:
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262 return default
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263 return v
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264
305
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265 def _lookupref(self, key, default=_MARKER):
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266 """
311
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267
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268 `key` must be a configuration reference URI without any
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269 (namespace) prefixes and suffixes
305
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270
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271 """
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272 return self.expand_ref_uri(key, default=default)
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273
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274 def expand_if_reference(self, v, default=_MARKER):
311
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275 """Check whether `v` is a configuration reference and -- if true --
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276 then expand it.
305
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277
310
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278 `v` must match the pattern ``{{ref:<REFERENCE>}}``
305
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279
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280 All non-matching texttypes and all non-texttypes are returned
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281 unchanged.
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282
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283 """
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284 if not isinstance(v, self._TEXTTYPE):
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285 return v
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286 if not v.startswith(self._STARTTOK_REF) \
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287 or not v.endswith(self._ENDTOK_REF):
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288 return v
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289 return self.expand_ref_uri(
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290 v[len(self._STARTTOK_REF):-len(self._ENDTOK_REF)],
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291 default=default)
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292
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293 def expand_ref_uri(self, uri, default=_MARKER):
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294 pu = urlsplit(uri)
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295 if pu.scheme or pu.netloc or pu.path or pu.query:
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296 raise ValueError("only fragment-only URIs are supported")
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297 if not pu.fragment:
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298 return self
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299 if pu.fragment.startswith(self._DOT):
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300 raise ValueError("relative refs not supported")
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301 return self.getvar(pu.fragment, default=default)
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302
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303 def substitute_variables_in_obj(self, obj):
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304 """Recursively expand variables in the object tree `obj`."""
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305 if isinstance(obj, self._TEXTTYPE):
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306 # a string - really replace the value
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307 return self.expand_variable(obj)
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308 elif isinstance(obj, list):
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309 return [self.substitute_variables_in_obj(i) for i in obj]
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310 elif isinstance(obj, tuple):
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311 tmp = [self.substitute_variables_in_obj(i) for i in obj]
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312 return type(obj)(tmp)
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313 elif isinstance(obj, dict):
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314 newdict = type(obj)()
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315 for k in obj:
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316 newdict[k] = self.substitute_variables_in_obj(obj[k])
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317 return newdict
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318 elif isinstance(obj, set):
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319 newset = type(obj)()
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320 for i in obj:
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321 newset.add(self.substitute_variables_in_obj(i))
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322 else:
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323 return obj
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324
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325 def expand_variable(self, s):
302
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326 """Expand variables in the single string `s`"""
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327 start = s.find(self._STARTTOK, 0)
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328 while start != -1:
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329 end = s.find(self._ENDTOK, start)
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330 if end < 0:
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331 return s
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332 varname, filters = self._split_filters(s[start+2:end])
39
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333 try:
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334 varvalue = self._apply_filters(filters, self.getvar_s(varname))
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335 except KeyError:
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336 warnings.warn("Cannot expand variable %r in string "
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337 "%r" % (varname, s, ),
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338 UserWarning,
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339 stacklevel=1)
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340 raise
25
baf862cb4860 Handle "None" variable values when substituting
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341 if varvalue is None:
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342 varvalue = u("")
251
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343 #
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344 # Dont apply and type conversions to str if the whole `s` is
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345 # just one expansion
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346 #
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347 if (start == 0) and (end + 2 == len(s)):
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348 return varvalue
249
1e38ccfba3de Use explicit type conversion instead of an implicit one.
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349 replaced = s[:start] + u(str(varvalue))
248
13283057a21e Do not use ".format()" but string concatenation or (when conversion to Unicode is needed) the faster %s method
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350 s = replaced + s[end+2:]
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351 # don't re-evaluate because `self.getvar_s()` expands already
23
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352 start = s.find(self._STARTTOK, len(replaced))
16
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353 return s
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354
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355 def _apply_filters(self, filters, value):
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356 for name in filters:
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357 try:
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358 filterfn = lookup_filter(name)
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359 except KeyError:
40
8d66aef2f7fb Comment about exceptions when filters are missing.
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360 #
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361 # Convert to NameError because we find a missing filters
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362 # a very serious error.
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363 #
16
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364 raise NameError("Filter %r not found" % name)
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365 else:
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366 value = filterfn(self, value)
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367 return value