Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/config.py @ 53:1d43f0b9fa20

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Make README the content of the master document
author Franz Glasner <hg@dom66.de>
date Tue, 27 Feb 2018 23:00:32 +0100
parents 8d66aef2f7fb
children aa8345dae995
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1 # -*- coding: utf-8 -*-
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2 r"""The unified configuration dictionary with attribute support
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3 or variable substitution.
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4
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5 """
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6
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7 from __future__ import division, absolute_import, print_function
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8
39
8715e5cc59ac Print a warning if a variable cannot be expanded.
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9 import warnings
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10 try:
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11 from collections import OrderedDict as ConfigurationBase
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12 except ImportError:
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13 try:
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14 from ordereddict import OrderedDict as ConfigurationBase
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15 except ImportError:
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16 ConfigurationBase = dict
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17
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18 from .variables import lookup_varns, lookup_filter
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19 from .compat import u
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20
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21
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22 __all__ = ["Configuration"]
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23
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24
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25 _MARKER = object()
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26
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28 class _AttributeDict(ConfigurationBase):
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29
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30 def __getattr__(self, name):
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31 try:
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32 v = self[name]
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33 except KeyError:
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34 raise AttributeError("%s has no attribute %r" % (type(self), name))
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35 else:
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36 # Wrap a dict into another dict with attribute access support
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37 if isinstance(v, dict):
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38 return _AttributeDict(v)
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39 else:
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40 return v
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41
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43 class Configuration(_AttributeDict):
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44
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45 """The configuration dictionary with attribute support or
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46 variable substitution.
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47
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48 .. note:: When retriving by attribute names variables will *not*
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49 substituted.
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50
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51 """
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52
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53 def getvar(self, varname, default=_MARKER):
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54 """Get a variable of the form ``[[ns1.]ns2.]name`` - including
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55 variables from other namespaces.
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56
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57 No variable expansion is done and no filters are applied.
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58 """
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59 varns, varname = self._split_ns(varname)
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60 try:
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61 if not varns:
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62 lookupfn = self._lookupvar
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63 else:
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64 lookupfn = lookup_varns(varns)
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65 varvalue = lookupfn(varname)
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66 except KeyError:
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67 if default is _MARKER:
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68 raise KeyError("Variable %r not found" % varname)
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69 else:
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70 return default
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71 else:
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72 return varvalue
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73
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74 def getvar_s(self, varname, default=_MARKER):
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75 """Get a variable - including variables from other namespaces.
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76
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77 Variables will be substituted recursively in the result.
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78 """
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79 try:
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80 obj = self.getvar(varname)
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81 return self.substitute_variables_in_obj(obj)
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82 except KeyError:
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83 if default is _MARKER:
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84 raise
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85 else:
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86 return default
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87
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88 def getintvar_s(self, varname, default=_MARKER):
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89 """Get a (possibly substituted) variable and coerce text to a
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90 number.
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91
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92 """
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93 s = self.getvar_s(varname, default)
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94 if isinstance(s, self._TEXTTYPE):
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95 return int(s, 0)
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96 else:
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97 return s
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98
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99 def getboolvar_s(self, varname, default=_MARKER):
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100 """Get a (possibly substituted) variable and convert text to a
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101 boolean
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102
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103 """
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104 s = self.getvar_s(varname, default)
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105 if isinstance(s, self._TEXTTYPE):
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106 sl = s.strip().lower()
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107 if not sl in self._BOOL_CVT:
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108 raise ValueError("Not a boolean: %r" % s)
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109 return self._BOOL_CVT[sl]
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110 else:
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111 return s
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112
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113 # Conversion of booleans
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114 _BOOL_CVT = {'1': True, 'yes': True, 'true': True, 'on': True,
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115 '0': False, 'no': False, 'false': False, 'off': False}
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116
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117 def getfloatvar_s(self, varname, default=_MARKER):
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118 """Get a (possibly substituted) variable and convert text to a
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119 float
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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 float(s)
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125 else:
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126 return s
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127
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128 def _split_ns(self, s):
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129 nameparts = s.split(':', 1)
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130 if len(nameparts) == 1:
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131 return (None, s, )
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132 else:
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133 return (nameparts[0], nameparts[1], )
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134
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135 def _split_filters(self, s):
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136 nameparts = s.split('|')
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137 if len(nameparts) == 1:
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138 return (s, [], )
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139 else:
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140 return (nameparts[0].rstrip(), nameparts[1:], )
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141
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142 def _lookupvar(self, key, default=_MARKER):
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143 """Lookup a variable.
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144
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145 If no default is given an unexisting `key` raises a `KeyError`
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146 else `default` is returned.
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147 """
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148 parts = key.split('.')
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149 try:
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150 v = self[parts[0]]
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151 for p in parts[1:]:
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152 v = v[p]
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153 except KeyError:
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154 if default is _MARKER:
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155 raise KeyError("Configuration variable %r not found" % key)
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156 else:
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157 return default
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158 return v
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159
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160 # Speed
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161 _TEXTTYPE = type(u(""))
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162
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163 def substitute_variables_in_obj(self, obj):
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164 """Recursively expand variables in the object tree `obj`."""
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165 if isinstance(obj, self._TEXTTYPE):
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166 # a string - really replace the value
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167 return self.expand_variable(obj)
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168 elif isinstance(obj, list):
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169 return [self.substitute_variables_in_obj(i) for i in obj]
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170 elif isinstance(obj, tuple):
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171 tmp = [self.substitute_variables_in_obj(i) for i in obj]
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172 return type(obj)(tmp)
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173 elif isinstance(obj, dict):
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174 newdict = type(obj)()
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175 for k in obj:
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176 newdict[k] = self.substitute_variables_in_obj(obj[k])
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177 return newdict
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178 elif isinstance(obj, set):
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179 newset = type(obj)()
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180 for i in obj:
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181 newset.add(self.substitute_variables_in_obj(i))
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182 else:
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183 return obj
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184
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185 # Speed
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186 _STARTTOK = u(b"{{")
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187 _ENDTOK = u(b"}}")
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188
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189 def expand_variable(self, s):
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190 """Expand variables in a single string"""
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191 start = s.find(self._STARTTOK, 0)
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192 while start != -1:
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193 end = s.find(self._ENDTOK, start)
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194 if end < 0:
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195 return s
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196 varname, filters = self._split_filters(s[start+2:end])
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197 try:
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198 varvalue = self._apply_filters(filters, self.getvar_s(varname))
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199 except KeyError:
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200 warnings.warn("Cannot expand variable %r in string "
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201 "%r" % (varname, s, ),
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202 UserWarning,
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203 stacklevel=1)
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204 raise
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205 if varvalue is None:
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206 varvalue = u("")
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207 replaced = u(b"{0}{1}").format(s[:start], varvalue)
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208 s = u(b"{0}{1}").format(replaced, s[end+2:])
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209 # don't re-evaluate because `self.getvar_s()` expands already
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210 start = s.find(self._STARTTOK, len(replaced))
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211 return s
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212
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213 def _apply_filters(self, filters, value):
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214 for name in filters:
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215 try:
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216 filterfn = lookup_filter(name)
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217 except KeyError:
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218 #
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219 # Convert to NameError because we find a missing filters
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220 # a very serious error.
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221 #
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222 raise NameError("Filter %r not found" % name)
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223 else:
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224 value = filterfn(self, value)
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225 return value