Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/config.py @ 311:035b42a224ed

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author Franz Glasner <fzglas.hg@dom66.de>
date Wed, 28 Apr 2021 09:23:14 +0200
parents 801cd16223e4
children 043a6412be3c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # -*- coding: utf-8 -*-
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2 # :-
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3 # :Copyright: (c) 2015-2021, Franz Glasner. All rights reserved.
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eed16a1ec8f3 Use SPDX license identifiers (either full or short) all over the package
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4 # :License: BSD-3-Clause. See LICENSE.txt for details.
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5 # :-
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6 """The unified configuration dictionary with attribute support or
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7 variable substitution.
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8
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9 """
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10
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11 from __future__ import division, absolute_import, print_function
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12
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13
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14 __all__ = ["Configuration"]
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15
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16
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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 try:
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26 from urllib.parse import urlsplit
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27 except ImportError:
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28 from urlparse import urlsplit
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29
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30 from .variables import lookup_varns, lookup_filter
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31 from .compat import u
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32 from .constants import REF_NAMESPACE
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35 _MARKER = object()
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37
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38 class _AttributeDict(ConfigurationBase):
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40 def __getattr__(self, name):
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41 try:
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42 v = self[name]
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43 except KeyError:
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44 raise AttributeError("%s has no attribute %r" % (type(self), name))
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45 else:
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46 # Wrap a dict into another dict with attribute access support
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47 if isinstance(v, dict):
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48 return _AttributeDict(v)
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49 else:
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50 return v
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53 class Configuration(_AttributeDict):
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55 """The configuration dictionary with attribute support or
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56 variable substitution.
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57
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58 .. note:: When retriving by attribute names variables will *not*
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59 substituted.
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60
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61 """
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62
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63 # Speed
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64 _TEXTTYPE = type(u(""))
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65 _STARTTOK = u(b"{{")
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66 _ENDTOK = u(b"}}")
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67 _NS_SEPARATOR = u(b':')
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68 _FILTER_SEPARATOR = u(b'|')
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69 _STARTTOK_REF = _STARTTOK + REF_NAMESPACE + _NS_SEPARATOR
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70 _ENDTOK_REF = _ENDTOK
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71 _DOT = u(b'.')
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72
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73 def getvar(self, varname, default=_MARKER):
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74 """Get a variable of the form ``[ns:][[key1.]key2.]name`` - including
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75 variables from other namespaces.
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76
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77 No variable interpolation is done and no filters are applied.
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78
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79 """
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80 varns, varname = self._split_ns(varname)
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81 try:
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82 if not varns:
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83 lookupfn = self._lookupvar
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84 else:
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85 if varns == REF_NAMESPACE:
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86 lookupfn = self._lookupref
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87 else:
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88 lookupfn = lookup_varns(varns)
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89 varvalue = lookupfn(varname)
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90 except KeyError:
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91 if default is _MARKER:
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92 raise KeyError("Variable %r not found" % varname)
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93 else:
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94 return default
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95 else:
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96 return varvalue
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97
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98 def getvar_s(self, varname, default=_MARKER):
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99 """Get a variable - including variables from other namespaces.
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100
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101 `varname` is interpreted as in :meth:`.getvar`. But variables
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102 will be interpolated recursively within the variable values
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103 and filters are applied.
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104
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105 For more details see chapter :ref:`variable-interpolation`.
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106
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107 """
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108 try:
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109 obj = self.getvar(varname)
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110 return self.substitute_variables_in_obj(obj)
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111 except KeyError:
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112 if default is _MARKER:
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113 raise
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114 else:
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115 return default
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116
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117 def getintvar_s(self, varname, default=_MARKER):
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118 """Get a (possibly substituted) variable and coerce text to a
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119 number.
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120
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121 """
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122 s = self.getvar_s(varname, default)
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123 if isinstance(s, self._TEXTTYPE):
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124 return int(s, 0)
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125 else:
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126 return s
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127
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128 def getboolvar_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 boolean
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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 sl = s.strip().lower()
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136 if sl not in self._BOOL_CVT:
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137 raise ValueError("Not a boolean: %r" % s)
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138 return self._BOOL_CVT[sl]
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139 else:
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140 return s
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141
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142 # Conversion of booleans
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143 _BOOL_CVT = {
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144 u('1'): True, u('yes'): True, u('true'): True, u('on'): True,
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145 u('0'): False, u('no'): False, u('false'): False, u('off'): False
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146 }
36
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147
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148 def getfloatvar_s(self, varname, default=_MARKER):
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149 """Get a (possibly substituted) variable and convert text to a
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150 float
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151
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152 """
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153 s = self.getvar_s(varname, default)
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154 if isinstance(s, self._TEXTTYPE):
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155 return float(s)
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156 else:
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157 return s
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158
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159 def _split_ns(self, s):
305
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160 nameparts = s.split(self._NS_SEPARATOR, 1)
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161 if len(nameparts) == 1:
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162 return (None, s, )
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163 else:
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164 return (nameparts[0], nameparts[1], )
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165
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166 def _split_filters(self, s):
305
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167 nameparts = s.split(self._FILTER_SEPARATOR)
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168 if len(nameparts) == 1:
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169 return (s, [], )
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170 else:
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171 return (nameparts[0].rstrip(), nameparts[1:], )
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172
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173 def _lookupvar(self, key, default=_MARKER):
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174 """Lookup a variable.
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175
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176 If no default is given an unexisting `key` raises a `KeyError`
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177 else `default` is returned.
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178 """
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179 parts = key.split('.')
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180 try:
305
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181 v = self.expand_if_reference(self[parts[0]])
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182 for p in parts[1:]:
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183 v = self.expand_if_reference(v[p])
104
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184 except TypeError:
207
b3b5ed34d180 Handle most flake8 errors and warnings.
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185 raise KeyError(
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186 "Configuration variable %r not found"
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187 "(missing intermediate keys?)" % key)
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188 except KeyError:
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189 if default is _MARKER:
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190 raise KeyError("Configuration variable %r not found" % key)
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191 else:
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192 return default
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193 return v
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194
305
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195 def _lookupref(self, key, default=_MARKER):
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196 """
311
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197
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198 `key` must be a configuration reference URI without any
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199 (namespace) prefixes and suffixes
305
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200
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201 """
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202 return self.expand_ref_uri(key, default=default)
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203
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204 def expand_if_reference(self, v, default=_MARKER):
311
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205 """Check whether `v` is a configuration reference and -- if true --
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206 then expand it.
305
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207
310
801cd16223e4 FIX: Docu
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208 `v` must match the pattern ``{{ref:<REFERENCE>}}``
305
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209
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210 All non-matching texttypes and all non-texttypes are returned
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211 unchanged.
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212
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213 """
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214 if not isinstance(v, self._TEXTTYPE):
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215 return v
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216 if not v.startswith(self._STARTTOK_REF) \
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217 or not v.endswith(self._ENDTOK_REF):
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218 return v
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219 return self.expand_ref_uri(
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220 v[len(self._STARTTOK_REF):-len(self._ENDTOK_REF)],
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221 default=default)
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222
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223 def expand_ref_uri(self, uri, default=_MARKER):
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224 pu = urlsplit(uri)
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225 if pu.scheme or pu.netloc or pu.path or pu.query:
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226 raise ValueError("only fragment-only URIs are supported")
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diff changeset
227 if not pu.fragment:
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228 return self
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229 if pu.fragment.startswith(self._DOT):
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230 raise ValueError("relative refs not supported")
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231 return self.getvar(pu.fragment, default=default)
16
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232
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233 def substitute_variables_in_obj(self, obj):
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234 """Recursively expand variables in the object tree `obj`."""
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235 if isinstance(obj, self._TEXTTYPE):
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236 # a string - really replace the value
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237 return self.expand_variable(obj)
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238 elif isinstance(obj, list):
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239 return [self.substitute_variables_in_obj(i) for i in obj]
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240 elif isinstance(obj, tuple):
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241 tmp = [self.substitute_variables_in_obj(i) for i in obj]
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242 return type(obj)(tmp)
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243 elif isinstance(obj, dict):
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244 newdict = type(obj)()
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245 for k in obj:
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246 newdict[k] = self.substitute_variables_in_obj(obj[k])
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247 return newdict
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248 elif isinstance(obj, set):
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249 newset = type(obj)()
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250 for i in obj:
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251 newset.add(self.substitute_variables_in_obj(i))
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252 else:
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253 return obj
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254
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255 def expand_variable(self, s):
302
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diff changeset
256 """Expand variables in the single string `s`"""
16
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257 start = s.find(self._STARTTOK, 0)
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258 while start != -1:
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259 end = s.find(self._ENDTOK, start)
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260 if end < 0:
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261 return s
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262 varname, filters = self._split_filters(s[start+2:end])
39
8715e5cc59ac Print a warning if a variable cannot be expanded.
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diff changeset
263 try:
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diff changeset
264 varvalue = self._apply_filters(filters, self.getvar_s(varname))
8715e5cc59ac Print a warning if a variable cannot be expanded.
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diff changeset
265 except KeyError:
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266 warnings.warn("Cannot expand variable %r in string "
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267 "%r" % (varname, s, ),
8715e5cc59ac Print a warning if a variable cannot be expanded.
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diff changeset
268 UserWarning,
8715e5cc59ac Print a warning if a variable cannot be expanded.
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diff changeset
269 stacklevel=1)
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diff changeset
270 raise
25
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diff changeset
271 if varvalue is None:
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272 varvalue = u("")
251
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273 #
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274 # Dont apply and type conversions to str if the whole `s` is
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diff changeset
275 # just one expansion
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diff changeset
276 #
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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diff changeset
277 if (start == 0) and (end + 2 == len(s)):
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278 return varvalue
249
1e38ccfba3de Use explicit type conversion instead of an implicit one.
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diff changeset
279 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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diff changeset
280 s = replaced + s[end+2:]
16
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281 # don't re-evaluate because `self.getvar_s()` expands already
23
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diff changeset
282 start = s.find(self._STARTTOK, len(replaced))
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283 return s
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284
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285 def _apply_filters(self, filters, value):
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286 for name in filters:
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287 try:
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288 filterfn = lookup_filter(name)
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289 except KeyError:
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290 #
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291 # Convert to NameError because we find a missing filters
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292 # a very serious error.
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293 #
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294 raise NameError("Filter %r not found" % name)
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295 else:
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296 value = filterfn(self, value)
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297 return value