Mercurial > hgrepos > Python > libs > ConfigMix
annotate configmix/config.py @ 418:bb5f11abd12a
Implement .getkeysl() and .getkeys() for configuration objects that iterate over all the keys of a configuration value
| author | Franz Glasner <fzglas.hg@dom66.de> |
|---|---|
| date | Thu, 02 Dec 2021 01:24:53 +0100 |
| parents | 83d537f1dfbb |
| children | 079a82129110 |
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1 # -*- coding: utf-8 -*- |
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2 # :- |
| 302 | 3 # :Copyright: (c) 2015-2021, 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 """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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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, uchr |
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32 from .constants import REF_NAMESPACE, NONE_FILTER, EMPTY_FILTER |
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33 |
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34 |
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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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39 |
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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 CoercingMethodsMixin(object): |
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54 |
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55 """Mixin to provide some common implementations for retrieval |
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56 methods that convert return values to a fixed type (int, bool, |
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57 float). |
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58 |
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59 Both :class:`~.Configuration` and :class:`~._JailedConfiguration` use |
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60 this mixin. |
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61 |
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62 """ |
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63 |
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64 def getintvarl_s(self, *path, **kwds): |
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65 """Get a (possibly substituted) variable and coerce text to a |
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66 number. |
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67 |
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68 """ |
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69 s = self.getvarl_s(*path, **kwds) |
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70 if isinstance(s, Configuration._TEXTTYPE): |
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71 return int(s, 0) |
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72 else: |
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73 return s |
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74 |
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75 def getfirstintvarl_s(self, *paths, **kwds): |
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76 """Get a (possibly substituted) variable and coerce text to a |
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77 number. |
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78 |
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79 """ |
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80 s = self.getfirstvarl_s(*paths, **kwds) |
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81 if isinstance(s, Configuration._TEXTTYPE): |
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82 return int(s, 0) |
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83 else: |
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84 return s |
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85 |
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86 def getintvar_s(self, varname, default=_MARKER): |
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87 """Get a (possibly substituted) variable and coerce text to a |
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88 number. |
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89 |
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90 """ |
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91 s = self.getvar_s(varname, default=default) |
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92 if isinstance(s, Configuration._TEXTTYPE): |
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93 return int(s, 0) |
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94 else: |
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95 return s |
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96 |
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97 def getfirstintvar_s(self, *varnames, **kwds): |
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98 """A variant of :meth:`~.getintvar_s` that returns the first found |
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99 variable in the list of given variables in `varnames`. |
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100 |
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101 """ |
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102 s = self.getfirstvar_s(*varnames, **kwds) |
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103 if isinstance(s, Configuration._TEXTTYPE): |
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104 return int(s, 0) |
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106 return s |
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107 |
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108 def getboolvarl_s(self, *path, **kwds): |
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109 """Get a (possibly substituted) variable and convert text to a |
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110 boolean |
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111 |
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112 """ |
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113 s = self.getvarl_s(*path, **kwds) |
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114 if isinstance(s, Configuration._TEXTTYPE): |
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115 sl = s.strip().lower() |
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116 if sl not in self._BOOL_CVT: |
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117 raise ValueError("Not a boolean: %r" % s) |
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118 return self._BOOL_CVT[sl] |
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119 else: |
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120 return s |
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121 |
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122 def getfirstboolvarl_s(self, *paths, **kwds): |
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123 """Get a (possibly substituted) variable and convert text to a |
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124 boolean |
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125 |
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126 """ |
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127 s = self.getfirstvarl_s(*paths, **kwds) |
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128 if isinstance(s, Configuration._TEXTTYPE): |
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129 sl = s.strip().lower() |
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130 if sl not in self._BOOL_CVT: |
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131 raise ValueError("Not a boolean: %r" % s) |
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132 return self._BOOL_CVT[sl] |
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133 else: |
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134 return s |
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135 |
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136 def getboolvar_s(self, varname, default=_MARKER): |
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137 """Get a (possibly substituted) variable and convert text to a |
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138 boolean |
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139 |
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140 """ |
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141 s = self.getvar_s(varname, default=default) |
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142 if isinstance(s, Configuration._TEXTTYPE): |
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143 sl = s.strip().lower() |
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144 if sl not in self._BOOL_CVT: |
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145 raise ValueError("Not a boolean: %r" % s) |
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146 return self._BOOL_CVT[sl] |
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147 else: |
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148 return s |
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149 |
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150 def getfirstboolvar_s(self, *varnames, **kwds): |
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151 """A variant of :meth:`~.getboolvar_s` that returns the first found |
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152 variable in the list of given variables in `varnames`. |
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153 |
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154 """ |
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155 s = self.getfirstvar_s(*varnames, **kwds) |
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156 if isinstance(s, Configuration._TEXTTYPE): |
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157 sl = s.strip().lower() |
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158 if sl not in self._BOOL_CVT: |
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159 raise ValueError("Not a boolean: %r" % s) |
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160 return self._BOOL_CVT[sl] |
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161 else: |
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162 return s |
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163 |
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164 # Conversion of booleans |
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165 _BOOL_CVT = { |
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166 u('1'): True, u('yes'): True, u('true'): True, u('on'): True, |
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167 u('0'): False, u('no'): False, u('false'): False, u('off'): False |
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168 } |
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169 |
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170 def getfloatvarl_s(self, *path, **kwds): |
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171 """Get a (possibly substituted) variable and convert text to a |
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172 float |
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173 |
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174 """ |
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175 s = self.getvarl_s(*path, **kwds) |
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176 if isinstance(s, Configuration._TEXTTYPE): |
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177 return float(s) |
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178 else: |
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179 return s |
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180 |
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181 def getfirstfloatvarl_s(self, *path, **kwds): |
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182 """Get a (possibly substituted) variable and convert text to a |
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183 float |
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184 |
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185 """ |
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186 s = self.getfirstvarl_s(*path, **kwds) |
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187 if isinstance(s, Configuration._TEXTTYPE): |
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188 return float(s) |
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189 else: |
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190 return s |
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191 |
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192 def getfloatvar_s(self, varname, default=_MARKER): |
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193 """Get a (possibly substituted) variable and convert text to a |
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194 float |
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195 |
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196 """ |
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197 s = self.getvar_s(varname, default) |
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198 if isinstance(s, Configuration._TEXTTYPE): |
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199 return float(s) |
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200 else: |
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201 return s |
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202 |
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203 def getfirstfloatvar_s(self, varname, default=_MARKER): |
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204 """Get a (possibly substituted) variable and convert text to a |
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205 float |
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206 |
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207 """ |
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208 s = self.getfirstvar_s(varname, default) |
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209 if isinstance(s, Configuration._TEXTTYPE): |
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210 return float(s) |
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211 else: |
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212 return s |
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213 |
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214 |
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215 class Configuration(CoercingMethodsMixin, _AttributeDict): |
|
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216 |
| 18 | 217 """The configuration dictionary with attribute support or |
| 218 variable substitution. | |
| 219 | |
| 322 | 220 .. note:: When retrieving by attribute names variables will *not* |
| 18 | 221 substituted. |
| 222 | |
| 223 """ | |
| 224 | |
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225 # Speed |
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226 _TEXTTYPE = type(u("")) |
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227 _STARTTOK = u(b"{{") |
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228 _ENDTOK = u(b"}}") |
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229 _HIER_SEPARATOR = u(b'.') |
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230 _NS_SEPARATOR = u(b':') |
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231 _FILTER_SEPARATOR = u(b'|') |
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232 _STARTTOK_REF = _STARTTOK + REF_NAMESPACE + _NS_SEPARATOR |
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233 _ENDTOK_REF = _ENDTOK |
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234 _DOT = u(b'.') |
|
320
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235 _QUOTE = u(b'%') |
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325
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236 _COMMENT = u(b'#') |
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237 |
|
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238 is_jail = False |
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239 """Flag to show that this is not a jail for another configuration""" |
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240 |
|
382
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241 def getvarl(self, *path, **kwds): |
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242 """Get a variable where the hierarchy is given in `path` as sequence |
|
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243 and the namespace is given in the `namespace` keyword argument. |
|
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244 |
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245 No variable interpolation is done and no filters are applied. |
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246 |
|
382
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247 Quoting of `path` and `namespace` is *not* needed and wrong. |
| 333 | 248 |
|
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249 """ |
|
321
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250 default = kwds.pop("default", _MARKER) |
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251 namespace = kwds.pop("namespace", None) |
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252 try: |
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253 if not namespace: |
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254 lookupfn = self._lookupvar |
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255 else: |
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256 if namespace == REF_NAMESPACE: |
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257 lookupfn = self._lookupref |
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258 else: |
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259 lookupfn = lookup_varns(namespace) |
|
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260 varvalue = lookupfn(*path) |
|
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261 except KeyError: |
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262 if default is _MARKER: |
|
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263 raise KeyError("Variable %r not found" % (path,)) |
|
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264 else: |
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265 return default |
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266 else: |
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267 return varvalue |
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268 |
|
418
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269 def getkeysl(self, *path, **kwds): |
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270 """Yield the keys of a variable value. |
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271 |
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272 :rtype: A generator |
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273 :raise KeyError: |
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274 |
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275 .. note:: Dictionary keys are not subject to interpolation. |
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276 |
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277 """ |
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278 if "default" in kwds: |
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279 raise TypeError("got unexpected keyword argument: default") |
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280 for k in self.getvarl(*path, **kwds).keys(): |
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281 yield k |
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282 |
|
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283 def getfirstvarl(self, *paths, **kwds): |
|
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284 """A variant of :meth:`~.getvarl` that returns the first found |
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285 variable in the `paths` list. |
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286 |
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287 Every item in `paths` is either a `tuple` or `list` or a `dict`. |
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288 If the path item is a `dict` then it must have two keys "namespace" |
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289 and "path". |
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290 If the path item is a `list` or `tuple` then the namespace is assumed |
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291 to be `None`. |
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292 |
| 389 | 293 Note that a caller that wants to use variables from a non-default |
| 294 namespace must use a sequence of dicts. | |
| 295 | |
|
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296 No variable interpolation is done and no filters are applied. |
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297 |
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298 Quoting of anything in `paths` is *not* needed and wrong. |
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299 |
|
395
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300 """ |
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301 default = kwds.pop("default", _MARKER) |
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302 for path in paths: |
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303 if isinstance(path, (list, tuple)): |
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304 try: |
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305 varvalue = self.getvarl(*path) |
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306 except KeyError: |
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307 pass |
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308 else: |
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309 return varvalue |
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310 elif isinstance(path, dict): |
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311 try: |
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312 namespace = path["namespace"] |
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313 p = path["path"] |
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314 except KeyError: |
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315 raise TypeError("a paths dict item must have a `path'" |
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316 " and a `namespace' key") |
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317 else: |
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318 try: |
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319 varvalue = self.getvarl(*p, namespace=namespace) |
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320 except KeyError: |
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321 pass |
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322 else: |
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323 return varvalue |
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324 else: |
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325 raise TypeError("a paths item must be a dict, list or tuple") |
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326 if default is _MARKER: |
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327 raise KeyError( |
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328 "none of the given variables found: %r" % (paths,)) |
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329 else: |
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330 return default |
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331 |
|
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332 def getvar(self, varname, default=_MARKER): |
|
115
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333 """Get a variable of the form ``[ns:][[key1.]key2.]name`` - including |
|
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334 variables from other namespaces. |
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335 |
|
202
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336 No variable interpolation is done and no filters are applied. |
|
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337 |
| 333 | 338 Special characters (e.g. ``:`` and ``.``) must be quoted when using |
| 339 the default namespace. | |
| 340 | |
| 341 See also :meth:`~.quote`. | |
| 342 | |
|
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343 """ |
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344 varns, varname = self._split_ns(varname) |
|
314
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345 if not varns: |
| 396 | 346 varnameparts = [ |
| 347 self.unquote(vp) for vp in varname.split(self._HIER_SEPARATOR) | |
| 348 ] | |
|
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349 else: |
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350 varnameparts = (varname,) |
|
364
1941f0188e81
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351 return self.getvarl(*varnameparts, namespace=varns, default=default) |
|
314
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352 |
|
418
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353 def getkeys(self, varname): |
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354 """Yield all the keys of a variable value. |
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355 |
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356 :rtype: A generator |
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357 :raise KeyError: |
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358 |
|
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359 .. note:: Dictionary keys are not subject to interpolation. |
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360 |
|
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361 """ |
|
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362 for k in self.getvar(varname).keys(): |
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363 yield k |
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364 |
|
368
4ee53f6fcac1
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365 def getfirstvar(self, *varnames, **kwds): |
|
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366 """A variant of :meth:`~.getvar` that returns the first found variable |
|
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367 in the list of given variables in `varnames`. |
|
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368 |
|
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369 """ |
|
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370 default = kwds.pop("default", _MARKER) |
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371 for varname in varnames: |
|
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372 try: |
|
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373 varvalue = self.getvar(varname) |
|
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374 except KeyError: |
|
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|
375 pass |
|
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376 else: |
|
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377 return varvalue |
|
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Implement ".getfirstvar()" and ".getfirstvar_s()".
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378 if default is _MARKER: |
|
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379 raise KeyError( |
|
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Implement ".getfirstvar()" and ".getfirstvar_s()".
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380 "none of the given variables found: %r" % (varnames,)) |
|
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Implement ".getfirstvar()" and ".getfirstvar_s()".
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381 else: |
|
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Implement ".getfirstvar()" and ".getfirstvar_s()".
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|
382 return default |
|
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Implement ".getfirstvar()" and ".getfirstvar_s()".
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|
383 |
|
382
24db29162d09
Renamed "names" arguments into the more proper "path"
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381
diff
changeset
|
384 def getvarl_s(self, *path, **kwds): |
|
314
043a6412be3c
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diff
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385 """Get a variable - including variables from other namespaces. |
|
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diff
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|
386 |
|
382
24db29162d09
Renamed "names" arguments into the more proper "path"
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381
diff
changeset
|
387 `path` and `namespace` are interpreted as in |
|
314
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388 :meth:`.getvarl`. But variables will be interpolated |
|
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diff
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389 recursively within the variable values and filters are |
|
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|
390 applied. |
|
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|
391 |
|
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392 For more details see chapter :ref:`variable-interpolation`. |
|
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393 |
|
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Implemented new access methods .getvarl() and .getvarl_s
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|
394 """ |
|
321
7a0f3c256cf4
FIX: Python2 compatibility: keyword arguments after *args not allowed: use **kwds and manual retrieval with .pop() instead
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320
diff
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395 default = kwds.pop("default", _MARKER) |
|
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FIX: Python2 compatibility: keyword arguments after *args not allowed: use **kwds and manual retrieval with .pop() instead
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diff
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|
396 namespace = kwds.pop("namespace", None) |
|
16
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|
397 try: |
|
382
24db29162d09
Renamed "names" arguments into the more proper "path"
Franz Glasner <fzglas.hg@dom66.de>
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381
diff
changeset
|
398 obj = self.getvarl(*path, namespace=namespace) |
|
314
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diff
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399 return self.substitute_variables_in_obj(obj) |
|
16
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changeset
|
400 except KeyError: |
|
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changeset
|
401 if default is _MARKER: |
|
314
043a6412be3c
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diff
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|
402 raise |
|
16
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Implemented the real configuration dictionary with attribute access or
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changeset
|
403 else: |
|
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
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parents:
diff
changeset
|
404 return default |
|
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Implemented the real configuration dictionary with attribute access or
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parents:
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changeset
|
405 |
|
381
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
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diff
changeset
|
406 def getfirstvarl_s(self, *paths, **kwds): |
|
388
13427f37abab
Docs: document Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
385
diff
changeset
|
407 """A variant of :meth:`~.getfirstvarl` that does variable |
|
13427f37abab
Docs: document Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
385
diff
changeset
|
408 interpolation. |
|
13427f37abab
Docs: document Configuration.getfirstvarl_s()
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385
diff
changeset
|
409 |
|
13427f37abab
Docs: document Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
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385
diff
changeset
|
410 `paths` and `kwds` are interpreted as in :meth:`.getfirstvarl`. |
|
13427f37abab
Docs: document Configuration.getfirstvarl_s()
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385
diff
changeset
|
411 But variables will be interpolated |
|
13427f37abab
Docs: document Configuration.getfirstvarl_s()
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385
diff
changeset
|
412 recursively within the variable values and filters are |
|
13427f37abab
Docs: document Configuration.getfirstvarl_s()
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parents:
385
diff
changeset
|
413 applied. |
|
13427f37abab
Docs: document Configuration.getfirstvarl_s()
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385
diff
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|
414 |
|
13427f37abab
Docs: document Configuration.getfirstvarl_s()
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385
diff
changeset
|
415 For more details see chapter :ref:`variable-interpolation`. |
|
13427f37abab
Docs: document Configuration.getfirstvarl_s()
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385
diff
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|
416 |
|
13427f37abab
Docs: document Configuration.getfirstvarl_s()
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385
diff
changeset
|
417 """ |
|
381
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
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changeset
|
418 default = kwds.pop("default", _MARKER) |
|
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Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
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changeset
|
419 for path in paths: |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
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changeset
|
420 if isinstance(path, (list, tuple)): |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
421 try: |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
422 obj = self.getvarl(*path) |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
423 except KeyError: |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
424 pass |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
425 else: |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
426 return self.substitute_variables_in_obj(obj) |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
427 |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
428 elif isinstance(path, dict): |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
429 try: |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
430 namespace = path["namespace"] |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
431 p = path["path"] |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
432 except KeyError: |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
433 raise TypeError("a paths dict item must have a `path'" |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
434 " and a `namespace' key") |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
435 else: |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
436 try: |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
437 obj = self.getvarl(*p, namespace=namespace) |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
438 except KeyError: |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
439 pass |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
440 else: |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
441 return self.substitute_variables_in_obj(obj) |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
442 else: |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
443 raise TypeError("a paths item must be a dict, list or tuple") |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
444 if default is _MARKER: |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
445 raise KeyError( |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
446 "none of the given variables found: %r" % (paths,)) |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
447 else: |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
448 return default |
|
fe3dfd687621
Implemented Configuration.getfirstvarl() and Configuration.getfirstvarl_s()
Franz Glasner <fzglas.hg@dom66.de>
parents:
380
diff
changeset
|
449 |
|
16
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
450 def getvar_s(self, varname, default=_MARKER): |
|
24
fa65adab0b71
FIX: Typo in comment
Franz Glasner <f.glasner@feldmann-mg.com>
parents:
23
diff
changeset
|
451 """Get a variable - including variables from other namespaces. |
|
16
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
452 |
|
115
a5339d39af5c
Begin the documentation of variables and its expansion
Franz Glasner <hg@dom66.de>
parents:
104
diff
changeset
|
453 `varname` is interpreted as in :meth:`.getvar`. But variables |
|
202
2e66178a09d8
Docu: Ban "keyword expansion" -- use "variable interpolation" instead
Franz Glasner <fzglas.hg@dom66.de>
parents:
156
diff
changeset
|
454 will be interpolated recursively within the variable values |
|
2e66178a09d8
Docu: Ban "keyword expansion" -- use "variable interpolation" instead
Franz Glasner <fzglas.hg@dom66.de>
parents:
156
diff
changeset
|
455 and filters are applied. |
|
115
a5339d39af5c
Begin the documentation of variables and its expansion
Franz Glasner <hg@dom66.de>
parents:
104
diff
changeset
|
456 |
|
202
2e66178a09d8
Docu: Ban "keyword expansion" -- use "variable interpolation" instead
Franz Glasner <fzglas.hg@dom66.de>
parents:
156
diff
changeset
|
457 For more details see chapter :ref:`variable-interpolation`. |
|
115
a5339d39af5c
Begin the documentation of variables and its expansion
Franz Glasner <hg@dom66.de>
parents:
104
diff
changeset
|
458 |
|
16
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
459 """ |
|
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
460 try: |
|
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
461 obj = self.getvar(varname) |
|
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
462 return self.substitute_variables_in_obj(obj) |
|
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
463 except KeyError: |
|
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
464 if default is _MARKER: |
|
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
465 raise |
|
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
466 else: |
|
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
467 return default |
|
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
468 |
|
368
4ee53f6fcac1
Implement ".getfirstvar()" and ".getfirstvar_s()".
Franz Glasner <fzglas.hg@dom66.de>
parents:
364
diff
changeset
|
469 def getfirstvar_s(self, *varnames, **kwds): |
|
4ee53f6fcac1
Implement ".getfirstvar()" and ".getfirstvar_s()".
Franz Glasner <fzglas.hg@dom66.de>
parents:
364
diff
changeset
|
470 """A variant of :meth:`~.getvar_s` that returns the first found |
|
4ee53f6fcac1
Implement ".getfirstvar()" and ".getfirstvar_s()".
Franz Glasner <fzglas.hg@dom66.de>
parents:
364
diff
changeset
|
471 variable in the list of given variables in `varnames`. |
|
4ee53f6fcac1
Implement ".getfirstvar()" and ".getfirstvar_s()".
Franz Glasner <fzglas.hg@dom66.de>
parents:
364
diff
changeset
|
472 |
|
4ee53f6fcac1
Implement ".getfirstvar()" and ".getfirstvar_s()".
Franz Glasner <fzglas.hg@dom66.de>
parents:
364
diff
changeset
|
473 """ |
|
4ee53f6fcac1
Implement ".getfirstvar()" and ".getfirstvar_s()".
Franz Glasner <fzglas.hg@dom66.de>
parents:
364
diff
changeset
|
474 default = kwds.pop("default", _MARKER) |
|
4ee53f6fcac1
Implement ".getfirstvar()" and ".getfirstvar_s()".
Franz Glasner <fzglas.hg@dom66.de>
parents:
364
diff
changeset
|
475 for varname in varnames: |
|
4ee53f6fcac1
Implement ".getfirstvar()" and ".getfirstvar_s()".
Franz Glasner <fzglas.hg@dom66.de>
parents:
364
diff
changeset
|
476 try: |
|
4ee53f6fcac1
Implement ".getfirstvar()" and ".getfirstvar_s()".
Franz Glasner <fzglas.hg@dom66.de>
parents:
364
diff
changeset
|
477 obj = self.getvar(varname) |
|
4ee53f6fcac1
Implement ".getfirstvar()" and ".getfirstvar_s()".
Franz Glasner <fzglas.hg@dom66.de>
parents:
364
diff
changeset
|
478 except KeyError: |
|
4ee53f6fcac1
Implement ".getfirstvar()" and ".getfirstvar_s()".
Franz Glasner <fzglas.hg@dom66.de>
parents:
364
diff
changeset
|
479 pass |
|
4ee53f6fcac1
Implement ".getfirstvar()" and ".getfirstvar_s()".
Franz Glasner <fzglas.hg@dom66.de>
parents:
364
diff
changeset
|
480 else: |
|
4ee53f6fcac1
Implement ".getfirstvar()" and ".getfirstvar_s()".
Franz Glasner <fzglas.hg@dom66.de>
parents:
364
diff
changeset
|
481 return self.substitute_variables_in_obj(obj) |
|
4ee53f6fcac1
Implement ".getfirstvar()" and ".getfirstvar_s()".
Franz Glasner <fzglas.hg@dom66.de>
parents:
364
diff
changeset
|
482 if default is _MARKER: |
|
4ee53f6fcac1
Implement ".getfirstvar()" and ".getfirstvar_s()".
Franz Glasner <fzglas.hg@dom66.de>
parents:
364
diff
changeset
|
483 raise KeyError( |
|
4ee53f6fcac1
Implement ".getfirstvar()" and ".getfirstvar_s()".
Franz Glasner <fzglas.hg@dom66.de>
parents:
364
diff
changeset
|
484 "none of the given variables found: %r" % (varnames,)) |
|
4ee53f6fcac1
Implement ".getfirstvar()" and ".getfirstvar_s()".
Franz Glasner <fzglas.hg@dom66.de>
parents:
364
diff
changeset
|
485 else: |
|
4ee53f6fcac1
Implement ".getfirstvar()" and ".getfirstvar_s()".
Franz Glasner <fzglas.hg@dom66.de>
parents:
364
diff
changeset
|
486 return default |
|
4ee53f6fcac1
Implement ".getfirstvar()" and ".getfirstvar_s()".
Franz Glasner <fzglas.hg@dom66.de>
parents:
364
diff
changeset
|
487 |
|
16
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
488 def _split_ns(self, s): |
|
305
f529ca46dd50
Implemented the "ref" namespace to get configuration tree references.
Franz Glasner <fzglas.hg@dom66.de>
parents:
304
diff
changeset
|
489 nameparts = s.split(self._NS_SEPARATOR, 1) |
|
16
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
490 if len(nameparts) == 1: |
|
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
491 return (None, s, ) |
|
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
492 else: |
|
329
d81d2cdf4925
FIX: Handle the unquoting of namespaces within Configuration.getvar() properly.
Franz Glasner <fzglas.hg@dom66.de>
parents:
326
diff
changeset
|
493 return (self.unquote(nameparts[0]), nameparts[1], ) |
|
16
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
494 |
|
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
495 def _split_filters(self, s): |
|
305
f529ca46dd50
Implemented the "ref" namespace to get configuration tree references.
Franz Glasner <fzglas.hg@dom66.de>
parents:
304
diff
changeset
|
496 nameparts = s.split(self._FILTER_SEPARATOR) |
|
16
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
497 if len(nameparts) == 1: |
|
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
498 return (s, [], ) |
|
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
499 else: |
|
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
500 return (nameparts[0].rstrip(), nameparts[1:], ) |
|
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
501 |
|
382
24db29162d09
Renamed "names" arguments into the more proper "path"
Franz Glasner <fzglas.hg@dom66.de>
parents:
381
diff
changeset
|
502 def _lookupvar(self, *path, **kwds): |
|
314
043a6412be3c
Implemented new access methods .getvarl() and .getvarl_s
Franz Glasner <fzglas.hg@dom66.de>
parents:
311
diff
changeset
|
503 """Lookup a variable within a hierarchy. |
|
16
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
504 |
|
382
24db29162d09
Renamed "names" arguments into the more proper "path"
Franz Glasner <fzglas.hg@dom66.de>
parents:
381
diff
changeset
|
505 If no default is given an unexisting `path` raises a `KeyError` |
|
16
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
506 else `default` is returned. |
|
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
507 """ |
|
321
7a0f3c256cf4
FIX: Python2 compatibility: keyword arguments after *args not allowed: use **kwds and manual retrieval with .pop() instead
Franz Glasner <f.glasner@feldmann-mg.com>
parents:
320
diff
changeset
|
508 default = kwds.pop("default", _MARKER) |
|
16
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
509 try: |
|
382
24db29162d09
Renamed "names" arguments into the more proper "path"
Franz Glasner <fzglas.hg@dom66.de>
parents:
381
diff
changeset
|
510 v = self.expand_if_reference(self[path[0]]) |
|
24db29162d09
Renamed "names" arguments into the more proper "path"
Franz Glasner <fzglas.hg@dom66.de>
parents:
381
diff
changeset
|
511 for p in path[1:]: |
|
305
f529ca46dd50
Implemented the "ref" namespace to get configuration tree references.
Franz Glasner <fzglas.hg@dom66.de>
parents:
304
diff
changeset
|
512 v = self.expand_if_reference(v[p]) |
|
104
d9f9a06e0c49
Make a better error message for "TypeError" exceptions when looking up variables.
Franz Glasner <f.glasner@feldmann-mg.com>
parents:
82
diff
changeset
|
513 except TypeError: |
|
207
b3b5ed34d180
Handle most flake8 errors and warnings.
Franz Glasner <fzglas.hg@dom66.de>
parents:
202
diff
changeset
|
514 raise KeyError( |
|
b3b5ed34d180
Handle most flake8 errors and warnings.
Franz Glasner <fzglas.hg@dom66.de>
parents:
202
diff
changeset
|
515 "Configuration variable %r not found" |
|
382
24db29162d09
Renamed "names" arguments into the more proper "path"
Franz Glasner <fzglas.hg@dom66.de>
parents:
381
diff
changeset
|
516 "(missing intermediate keys?)" % (path,)) |
|
16
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
517 except KeyError: |
|
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
518 if default is _MARKER: |
|
314
043a6412be3c
Implemented new access methods .getvarl() and .getvarl_s
Franz Glasner <fzglas.hg@dom66.de>
parents:
311
diff
changeset
|
519 raise KeyError( |
|
382
24db29162d09
Renamed "names" arguments into the more proper "path"
Franz Glasner <fzglas.hg@dom66.de>
parents:
381
diff
changeset
|
520 "Configuration variable %r not found" % (path,)) |
|
16
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
521 else: |
|
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
522 return default |
|
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
523 return v |
|
f85dc4677c01
Implemented the real configuration dictionary with attribute access or
Franz Glasner <hg@dom66.de>
parents:
diff
changeset
|
524 |
|
305
f529ca46dd50
Implemented the "ref" namespace to get configuration tree references.
Franz Glasner <fzglas.hg@dom66.de>
parents:
304
diff
changeset
|
525 def _lookupref(self, key, default=_MARKER): |
|
f529ca46dd50
Implemented the "ref" namespace to get configuration tree references.
Franz Glasner <fzglas.hg@dom66.de>
parents:
304
diff
changeset
|
526 """ |
| 311 | 527 |
| 528 `key` must be a configuration reference URI without any | |
| 529 (namespace) prefixes and suffixes | |
|
305
f529ca46dd50
Implemented the "ref" namespace to get configuration tree references.
Franz Glasner <fzglas.hg@dom66.de>
parents:
304
diff
changeset
|
530 |
|
f529ca46dd50
Implemented the "ref" namespace to get configuration tree references.
Franz Glasner <fzglas.hg@dom66.de>
parents:
304
diff
changeset
|
531 """ |
|
f529ca46dd50
Implemented the "ref" namespace to get configuration tree references.
Franz Glasner <fzglas.hg@dom66.de>
parents:
304
diff
changeset
|
532 return self.expand_ref_uri(key, default=default) |
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533 |
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534 def expand_if_reference(self, v, default=_MARKER): |
| 311 | 535 """Check whether `v` is a configuration reference and -- if true -- |
| 536 then expand it. | |
|
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537 |
| 310 | 538 `v` must match the pattern ``{{ref:<REFERENCE>}}`` |
|
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539 |
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540 All non-matching texttypes and all non-texttypes are returned |
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541 unchanged. |
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542 |
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543 """ |
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544 if not isinstance(v, self._TEXTTYPE): |
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545 return v |
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546 if not v.startswith(self._STARTTOK_REF) \ |
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547 or not v.endswith(self._ENDTOK_REF): |
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548 return v |
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549 return self.expand_ref_uri( |
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550 v[len(self._STARTTOK_REF):-len(self._ENDTOK_REF)], |
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551 default=default) |
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552 |
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553 def expand_ref_uri(self, uri, default=_MARKER): |
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554 pu = urlsplit(uri) |
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555 if pu.scheme or pu.netloc or pu.path or pu.query: |
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556 raise ValueError("only fragment-only URIs are supported") |
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557 if not pu.fragment: |
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558 return self |
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559 if pu.fragment.startswith(self._DOT): |
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560 raise ValueError("relative refs not supported") |
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561 return self.getvar(pu.fragment, default=default) |
|
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562 |
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563 def substitute_variables_in_obj(self, obj): |
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564 """Recursively expand variables in the object tree `obj`.""" |
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565 if isinstance(obj, self._TEXTTYPE): |
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566 # a string - really replace the value |
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567 return self.expand_variable(obj) |
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568 elif isinstance(obj, list): |
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569 return [self.substitute_variables_in_obj(i) for i in obj] |
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570 elif isinstance(obj, tuple): |
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571 tmp = [self.substitute_variables_in_obj(i) for i in obj] |
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572 return type(obj)(tmp) |
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573 elif isinstance(obj, dict): |
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574 newdict = type(obj)() |
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575 for k in obj: |
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576 newdict[k] = self.substitute_variables_in_obj(obj[k]) |
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577 return newdict |
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578 elif isinstance(obj, set): |
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579 newset = type(obj)() |
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580 for i in obj: |
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581 newset.add(self.substitute_variables_in_obj(i)) |
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582 else: |
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583 return obj |
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584 |
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585 def expand_variable(self, s): |
| 302 | 586 """Expand variables in the single string `s`""" |
|
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587 start = s.find(self._STARTTOK, 0) |
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588 while start != -1: |
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589 end = s.find(self._ENDTOK, start) |
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590 if end < 0: |
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591 return s |
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592 varname, filters = self._split_filters(s[start+2:end]) |
|
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593 try: |
|
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594 if NONE_FILTER in filters: |
|
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595 varvalue = self._apply_filters( |
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596 filters, self.getvar_s(varname, default=None)) |
|
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597 elif EMPTY_FILTER in filters: |
|
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598 varvalue = self._apply_filters( |
|
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599 filters, self.getvar_s(varname, default=u(""))) |
|
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600 else: |
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601 varvalue = self._apply_filters( |
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602 filters, self.getvar_s(varname)) |
|
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603 except KeyError: |
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604 warnings.warn("Cannot expand variable %r in string " |
|
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605 "%r" % (varname, s, ), |
|
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606 UserWarning, |
|
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607 stacklevel=1) |
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608 raise |
|
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609 # |
|
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610 # Dont apply and type conversions to the variable value if |
|
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611 # the whole `s` is just one expansion |
|
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612 # |
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613 if (start == 0) and (end + 2 == len(s)): |
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614 return varvalue |
|
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615 if varvalue is None: |
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616 varvalue = u("") |
|
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617 replaced = s[:start] + u(str(varvalue)) |
|
248
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618 s = replaced + s[end+2:] |
|
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619 # don't re-evaluate because `self.getvar_s()` expands already |
|
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620 start = s.find(self._STARTTOK, len(replaced)) |
|
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621 return s |
|
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622 |
|
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623 def _apply_filters(self, filters, value): |
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624 for name in filters: |
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625 try: |
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626 filterfn = lookup_filter(name) |
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627 except KeyError: |
|
40
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|
628 # |
|
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|
629 # Convert to NameError because we find a missing filters |
|
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630 # a very serious error. |
|
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631 # |
|
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632 raise NameError("Filter %r not found" % name) |
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633 else: |
|
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634 value = filterfn(self, value) |
|
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635 return value |
|
320
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636 |
|
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637 @classmethod |
|
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638 def quote(klass, s): |
| 333 | 639 """Replace important special characters in string `s` by replacing |
| 640 them with ``%xNN`` where `NN` are the two hexadecimal digits of the | |
| 641 characters unicode codepoint value. | |
| 642 | |
| 643 Handled are the important special chars: ``%``, ``.``, ``:``, | |
|
334
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|
644 ``#``; ``'``, ``"``, ``|``, ``{``, ``}``, ``[`` and ``]``. |
| 333 | 645 |
| 646 See also the :ref:`quoting` section. | |
|
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647 |
|
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648 """ |
|
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649 qc = klass._QUOTE |
|
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650 s = s.replace(qc, qc + "x25") |
|
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651 s = s.replace(klass._DOT, qc + "x2e") |
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652 s = s.replace(klass._NS_SEPARATOR, qc + "x3a") |
|
325
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653 s = s.replace(klass._COMMENT, qc + "x23") |
|
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654 s = s.replace(klass._FILTER_SEPARATOR, qc + "x7c") |
|
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655 s = s.replace('"', qc + "x22") |
|
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656 s = s.replace("'", qc + "x27") |
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657 s = s.replace('{', qc + "x7b") |
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658 s = s.replace('}', qc + "x7d") |
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659 s = s.replace('[', qc + "x5b") |
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660 return s.replace(']', qc + "x5d") |
|
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661 |
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662 @classmethod |
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663 def unquote(klass, s): |
| 333 | 664 """Unquote the content of `s`: handle all patterns ``%xNN``, |
| 665 ``%uNNNN`` or ``%UNNNNNNNN``. | |
| 666 | |
| 667 This is the inverse of :meth:`~.quote`. | |
|
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668 |
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669 """ |
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670 if klass._QUOTE not in s: |
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671 return s |
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672 res = [] |
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673 parts = s.split(klass._QUOTE) |
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674 res.append(parts[0]) |
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675 for p in parts[1:]: |
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676 if p.startswith(u(b'x')): |
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677 if len(p) < 3: |
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678 raise ValueError("quote syntax: length too small") |
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679 res.append(uchr(int(p[1:3], 16))) |
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680 res.append(p[3:]) |
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681 elif p.startswith(u(b'u')): |
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682 if len(p) < 5: |
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683 raise ValueError("quote syntax: length too small") |
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684 res.append(uchr(int(p[1:5], 16))) |
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685 res.append(p[5:]) |
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686 elif p.startswith(u(b'U')): |
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687 if len(p) < 9: |
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688 raise ValueError("quote syntax: length too small") |
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689 res.append(uchr(int(p[1:9], 16))) |
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690 res.append(p[9:]) |
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691 else: |
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692 raise ValueError("unknown quote syntax string: {}".format(s)) |
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693 return ''.join(res) |
|
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694 |
|
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695 def jailed(self, rootpath=None, root=None, bind_root=True): |
| 399 | 696 """Return a "jailed" configuration of the current configuration. |
|
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697 |
| 399 | 698 :param rootpath: a sequence of strings that shall emcompass |
| 699 the chroot-like jail of the returned | |
| 700 configuration | |
| 701 :type rootpath: list or tuple | |
| 702 :param str root: a string path expression that shall encompass | |
| 703 the chroot-like jail of the returned configuration | |
|
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704 :param bool bind_root: if you do a :meth:`~.rebind` just after |
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705 creation of a jailed config you can set |
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706 `bind_root` to `False`; otherwise use |
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|
707 the default |
| 397 | 708 :return: a jailed (aka restricted) configuration |
| 709 :rtype: _JailedConfiguration | |
| 710 | |
| 399 | 711 Exactly one of `rootpath` or `root` must be given. |
| 712 | |
|
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713 """ |
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714 if rootpath is not None and root is not None: |
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715 raise ValueError("only one of `rootpath' or `root' can be given") |
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716 if rootpath is None and root is None: |
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717 raise ValueError("one of `rootpath' or `root' must be given") |
|
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718 if rootpath is not None and not isinstance(rootpath, (list, tuple)): |
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719 raise TypeError("`rootpath' must be a list or a tuple") |
|
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720 if root is not None: |
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721 # convert to path |
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722 varns, varname = self._split_ns(root) |
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723 if varns: |
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724 raise ValueError( |
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725 "jailed configurations do not support namespaces") |
|
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726 if varname: |
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727 rootpath = [ |
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728 self.unquote(p) for p in root.split( |
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729 self._HIER_SEPARATOR) |
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730 ] |
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731 else: |
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732 rootpath = tuple() |
|
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733 jc = _JailedConfiguration(*rootpath) |
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734 if bind_root: |
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735 jc.rebind(self) |
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736 return jc |
|
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737 |
|
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738 |
|
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739 class _JailedConfiguration(CoercingMethodsMixin): |
|
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740 |
| 397 | 741 """A jailed and restricted variant of :class:`Configuration`. |
| 742 | |
| 399 | 743 Restriction is two-fold: |
| 744 | |
| 745 - The access to configuration variables in `config` is restricted | |
| 746 to the configuration sub-tree that is configured in `path`. | |
| 747 | |
| 748 - Not all access-methods of :class:`Configuration` are implemented | |
| 749 yet. | |
| 750 | |
| 400 | 751 .. seealso:: :ref:`jailed-configuration` |
| 752 | |
| 399 | 753 .. note:: There is no namespace support. |
| 754 | |
| 755 .. note:: Do not call the constructor directly. Instantiate a jailed | |
| 756 configuration from the parent configuration's | |
| 757 :meth:`~.Configuration.jailed` factory method. | |
| 397 | 758 |
| 759 """ | |
|
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760 |
| 396 | 761 __slots__ = ("_base", "_path", "_pathstr") |
|
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762 |
|
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763 is_jail = True |
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764 """Flag to show that this is a jail for another configuration""" |
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765 |
|
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766 def __init__(self, *path): |
|
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767 super(_JailedConfiguration, self).__init__() |
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768 self._path = path |
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769 if path: |
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770 self._pathstr = \ |
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771 Configuration._HIER_SEPARATOR.join( |
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772 [Configuration.quote(p) for p in path]) \ |
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773 + Configuration._HIER_SEPARATOR |
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774 else: |
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775 self._pathstr = '' |
|
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776 |
|
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777 @property |
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778 def base(self): |
|
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779 """Ask for the base (aka parent) configuration""" |
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780 return self._base |
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781 |
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782 def rebind(self, new_base): |
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783 """Bind the jail to a new unjailed configuration `new_base`. |
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784 |
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785 The new configuration base also must have an existing path to |
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786 the root. |
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787 |
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788 :param Configuration new_base: the new base |
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789 |
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790 """ |
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791 if new_base.is_jail: |
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792 raise TypeError("can only bind to an unjailed configuration") |
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793 self._base = new_base |
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794 # |
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795 # Early error out if the chroot does not exist but allow |
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796 # degenerated case if `self._path` is empty. |
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797 # |
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798 if self._path: |
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799 new_base.getvarl(*self._path) |
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800 |
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801 def getvarl(self, *path, **kwds): |
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802 return self._base.getvarl(*(self._path + path), **kwds) |
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803 |
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804 def getkeysl(self, *path, **kwds): |
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805 for k in self._base.getkeysl(*(self._path + path), **kwds): |
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806 yield k |
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807 |
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808 def getfirstvarl(self, *paths, **kwds): |
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809 real_paths = [] |
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810 for path in paths: |
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811 if isinstance(path, (list, tuple)): |
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812 real_paths.append(self._path + path) |
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813 elif isinstance(path, dict): |
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814 raise TypeError( |
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815 "a `dict' is not supported in a jailed configuration") |
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816 else: |
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817 raise TypeError("a paths item must be a list or tuple") |
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818 return self._base.getfirstvarl(*real_paths, **kwds) |
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819 |
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820 def getvarl_s(self, *path, **kwds): |
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821 return self._base.getvarl_s(*(self._path + path), **kwds) |
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822 |
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823 def getfirstvarl_s(self, *paths, **kwds): |
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824 real_paths = [] |
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825 for path in paths: |
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826 if isinstance(path, (list, tuple)): |
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827 real_paths.append(self._path + path) |
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828 elif isinstance(path, dict): |
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829 raise TypeError( |
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830 "a `dict' is not supported in a jailed configuration") |
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831 else: |
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832 raise TypeError("a paths item must be a list or tuple") |
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833 return self._base.getfirstvarl_s(*real_paths, **kwds) |
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834 |
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835 def getvar(self, varname, default=_MARKER): |
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836 return self._base.getvar(self._pathstr + varname, default=default) |
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837 |
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838 def getkeys(self, varname): |
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839 for k in self._base.getkeys(self._pathstr + varname): |
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840 yield k |
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841 |
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842 def getfirstvar(self, *varnames, **kwds): |
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843 real_varnames = [self._pathstr + vn for vn in varnames] |
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844 return self._base.getfirstvar(*real_varnames, **kwds) |
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845 |
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846 def getvar_s(self, varname, default=_MARKER): |
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847 return self._base.getvar_s(self._pathstr + varname, default=default) |
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848 |
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849 def getfirstvar_s(self, *varnames, **kwds): |
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850 real_varnames = [self._pathstr + vn for vn in varnames] |
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851 return self._base.getfirstvar_s(*real_varnames, **kwds) |
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852 |
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853 def jailed(self, rootpath=None, root=None, bind_root=True): |
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854 """Return a "jailed" configuration that effectively is a |
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855 subjail of the current jail |
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856 |
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857 For a more complete description see :meth:`.Configuration.jailed`. |
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858 |
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859 """ |
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860 if rootpath is not None and root is not None: |
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861 raise ValueError("only one of `rootpath' or `root' can be given") |
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862 if rootpath is None and root is None: |
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863 raise ValueError("one of `rootpath' or `root' must be given") |
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864 if rootpath is not None and not isinstance(rootpath, (list, tuple)): |
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865 raise TypeError("`rootpath' must be a list or a tuple") |
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866 if root is not None: |
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867 # convert to path |
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868 varns, varname = self._base._split_ns(root) |
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869 if varns: |
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870 raise ValueError( |
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871 "sub-jails do not support namespaces") |
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872 if varname: |
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873 rootpath = [ |
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874 self._base.unquote(p) for p in varname.split( |
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875 self._base._HIER_SEPARATOR) |
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876 ] |
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877 else: |
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878 rootpath = tuple() |
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879 if self._path: |
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880 new_rootpath = self._path + tuple(rootpath) |
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881 else: |
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882 new_rootpath = rootpath |
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883 sjc = _JailedConfiguration(*new_rootpath) |
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884 if bind_root: |
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885 sjc.rebind(self._base) |
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886 return sjc |
