Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/config.py @ 293:6f0bf673d4ff

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Provide an optional "strict" flag to the top-level loader to pass it to low-level loaders that understand it. Currently only the YAML loader understands this flag.
author Franz Glasner <f.glasner@feldmann-mg.com>
date Wed, 10 Feb 2021 15:25:55 +0100
parents 2a8dcab2de8c
children eed16a1ec8f3
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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 """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
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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
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26 from .variables import lookup_varns, lookup_filter
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27 from .compat import u
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30 _MARKER = object()
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33 class _AttributeDict(ConfigurationBase):
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34
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35 def __getattr__(self, name):
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36 try:
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37 v = self[name]
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38 except KeyError:
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39 raise AttributeError("%s has no attribute %r" % (type(self), name))
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40 else:
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41 # Wrap a dict into another dict with attribute access support
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42 if isinstance(v, dict):
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43 return _AttributeDict(v)
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44 else:
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45 return v
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48 class Configuration(_AttributeDict):
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49
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50 """The configuration dictionary with attribute support or
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51 variable substitution.
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52
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53 .. note:: When retriving by attribute names variables will *not*
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54 substituted.
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55
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56 """
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57
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58 def getvar(self, varname, default=_MARKER):
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59 """Get a variable of the form ``[ns:][[key1.]key2.]name`` - including
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60 variables from other namespaces.
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61
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62 No variable interpolation is done and no filters are applied.
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64 """
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65 varns, varname = self._split_ns(varname)
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66 try:
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67 if not varns:
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68 lookupfn = self._lookupvar
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69 else:
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70 lookupfn = lookup_varns(varns)
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71 varvalue = lookupfn(varname)
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72 except KeyError:
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73 if default is _MARKER:
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74 raise KeyError("Variable %r not found" % varname)
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75 else:
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76 return default
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77 else:
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78 return varvalue
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80 def getvar_s(self, varname, default=_MARKER):
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81 """Get a variable - including variables from other namespaces.
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82
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83 `varname` is interpreted as in :meth:`.getvar`. But variables
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84 will be interpolated recursively within the variable values
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85 and filters are applied.
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87 For more details see chapter :ref:`variable-interpolation`.
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88
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89 """
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90 try:
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91 obj = self.getvar(varname)
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92 return self.substitute_variables_in_obj(obj)
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93 except KeyError:
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94 if default is _MARKER:
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95 raise
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96 else:
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97 return default
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98
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99 def getintvar_s(self, varname, default=_MARKER):
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100 """Get a (possibly substituted) variable and coerce text to a
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101 number.
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102
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103 """
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104 s = self.getvar_s(varname, default)
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105 if isinstance(s, self._TEXTTYPE):
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106 return int(s, 0)
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107 else:
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108 return s
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109
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110 def getboolvar_s(self, varname, default=_MARKER):
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111 """Get a (possibly substituted) variable and convert text to a
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112 boolean
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113
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114 """
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115 s = self.getvar_s(varname, default)
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116 if isinstance(s, self._TEXTTYPE):
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117 sl = s.strip().lower()
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118 if sl not in self._BOOL_CVT:
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119 raise ValueError("Not a boolean: %r" % s)
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120 return self._BOOL_CVT[sl]
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121 else:
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122 return s
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123
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124 # Conversion of booleans
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125 _BOOL_CVT = {'1': True, 'yes': True, 'true': True, 'on': True,
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126 '0': False, 'no': False, 'false': False, 'off': False}
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127
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128 def getfloatvar_s(self, varname, default=_MARKER):
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129 """Get a (possibly substituted) variable and convert text to a
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130 float
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131
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132 """
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133 s = self.getvar_s(varname, default)
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134 if isinstance(s, self._TEXTTYPE):
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135 return float(s)
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136 else:
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137 return s
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138
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139 def _split_ns(self, s):
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140 nameparts = s.split(':', 1)
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141 if len(nameparts) == 1:
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142 return (None, s, )
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143 else:
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144 return (nameparts[0], nameparts[1], )
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145
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146 def _split_filters(self, s):
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147 nameparts = s.split('|')
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148 if len(nameparts) == 1:
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149 return (s, [], )
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150 else:
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151 return (nameparts[0].rstrip(), nameparts[1:], )
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152
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153 def _lookupvar(self, key, default=_MARKER):
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154 """Lookup a variable.
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155
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156 If no default is given an unexisting `key` raises a `KeyError`
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157 else `default` is returned.
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158 """
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159 parts = key.split('.')
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160 try:
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161 v = self[parts[0]]
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162 for p in parts[1:]:
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163 v = v[p]
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164 except TypeError:
207
b3b5ed34d180 Handle most flake8 errors and warnings.
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165 raise KeyError(
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166 "Configuration variable %r not found"
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167 "(missing intermediate keys?)" % key)
16
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168 except KeyError:
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169 if default is _MARKER:
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170 raise KeyError("Configuration variable %r not found" % key)
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171 else:
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172 return default
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173 return v
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174
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175 # Speed
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176 _TEXTTYPE = type(u(""))
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177
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178 def substitute_variables_in_obj(self, obj):
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179 """Recursively expand variables in the object tree `obj`."""
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180 if isinstance(obj, self._TEXTTYPE):
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181 # a string - really replace the value
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182 return self.expand_variable(obj)
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183 elif isinstance(obj, list):
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184 return [self.substitute_variables_in_obj(i) for i in obj]
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185 elif isinstance(obj, tuple):
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186 tmp = [self.substitute_variables_in_obj(i) for i in obj]
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187 return type(obj)(tmp)
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188 elif isinstance(obj, dict):
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189 newdict = type(obj)()
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190 for k in obj:
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191 newdict[k] = self.substitute_variables_in_obj(obj[k])
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192 return newdict
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193 elif isinstance(obj, set):
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194 newset = type(obj)()
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195 for i in obj:
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196 newset.add(self.substitute_variables_in_obj(i))
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197 else:
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198 return obj
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199
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200 # Speed
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201 _STARTTOK = u(b"{{")
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202 _ENDTOK = u(b"}}")
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203
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204 def expand_variable(self, s):
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205 """Expand variables in a single string"""
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206 start = s.find(self._STARTTOK, 0)
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207 while start != -1:
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208 end = s.find(self._ENDTOK, start)
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209 if end < 0:
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210 return s
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211 varname, filters = self._split_filters(s[start+2:end])
39
8715e5cc59ac Print a warning if a variable cannot be expanded.
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212 try:
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213 varvalue = self._apply_filters(filters, self.getvar_s(varname))
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214 except KeyError:
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215 warnings.warn("Cannot expand variable %r in string "
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216 "%r" % (varname, s, ),
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217 UserWarning,
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218 stacklevel=1)
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219 raise
25
baf862cb4860 Handle "None" variable values when substituting
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220 if varvalue is None:
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221 varvalue = u("")
251
2a8dcab2de8c Do not implicitely convert a configuration value to text if the value is the result of just a variable expansion.
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222 #
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223 # Dont apply and type conversions to str if the whole `s` is
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224 # just one expansion
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225 #
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226 if (start == 0) and (end + 2 == len(s)):
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227 return varvalue
249
1e38ccfba3de Use explicit type conversion instead of an implicit one.
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228 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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229 s = replaced + s[end+2:]
16
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230 # don't re-evaluate because `self.getvar_s()` expands already
23
c77cb6bc8eeb FIX: Handle non-str types in variable substitutions properly
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diff changeset
231 start = s.find(self._STARTTOK, len(replaced))
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232 return s
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233
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234 def _apply_filters(self, filters, value):
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235 for name in filters:
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236 try:
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237 filterfn = lookup_filter(name)
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238 except KeyError:
40
8d66aef2f7fb Comment about exceptions when filters are missing.
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239 #
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diff changeset
240 # Convert to NameError because we find a missing filters
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diff changeset
241 # a very serious error.
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242 #
16
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243 raise NameError("Filter %r not found" % name)
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244 else:
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245 value = filterfn(self, value)
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246 return value