Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/config.py @ 37:2a4dbbb42f43 v0.4

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+++++ v0.4
author Franz Glasner <hg@dom66.de>
date Thu, 31 Mar 2016 19:19:24 +0200
parents b04a350f894b
children 8715e5cc59ac
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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
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9 try:
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10 from collections import OrderedDict as ConfigurationBase
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11 except ImportError:
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12 try:
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13 from ordereddict import OrderedDict as ConfigurationBase
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14 except ImportError:
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15 ConfigurationBase = dict
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16
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17 from .variables import lookup_varns, lookup_filter
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18 from .compat import u
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19
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20
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21 __all__ = ["Configuration"]
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22
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23
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24 _MARKER = object()
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25
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26
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27 class _AttributeDict(ConfigurationBase):
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28
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29 def __getattr__(self, name):
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30 try:
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31 v = self[name]
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32 except KeyError:
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33 raise AttributeError("%s has no attribute %r" % (type(self), name))
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34 else:
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35 # Wrap a dict into another dict with attribute access support
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36 if isinstance(v, dict):
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37 return _AttributeDict(v)
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38 else:
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39 return v
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40
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41
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42 class Configuration(_AttributeDict):
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43
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44 """The configuration dictionary with attribute support or
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45 variable substitution.
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46
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47 .. note:: When retriving by attribute names variables will *not*
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48 substituted.
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49
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50 """
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51
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52 def getvar(self, varname, default=_MARKER):
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53 """Get a variable of the form ``[[ns1.]ns2.]name`` - including
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54 variables from other namespaces.
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55
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56 No variable expansion is done and no filters are applied.
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57 """
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58 varns, varname = self._split_ns(varname)
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59 try:
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60 if not varns:
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61 lookupfn = self._lookupvar
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62 else:
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63 lookupfn = lookup_varns(varns)
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64 varvalue = lookupfn(varname)
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65 except KeyError:
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66 if default is _MARKER:
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67 raise KeyError("Variable %r not found" % varname)
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68 else:
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69 return default
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70 else:
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71 return varvalue
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72
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73 def getvar_s(self, varname, default=_MARKER):
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74 """Get a variable - including variables from other namespaces.
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75
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76 Variables will be substituted recursively in the result.
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77 """
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78 try:
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79 obj = self.getvar(varname)
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80 return self.substitute_variables_in_obj(obj)
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81 except KeyError:
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82 if default is _MARKER:
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83 raise
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84 else:
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85 return default
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86
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87 def getintvar_s(self, varname, default=_MARKER):
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88 """Get a (possibly substituted) variable and coerce text to a
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89 number.
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90
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91 """
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92 s = self.getvar_s(varname, default)
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93 if isinstance(s, self._TEXTTYPE):
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94 return int(s, 0)
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95 else:
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96 return s
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97
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98 def getboolvar_s(self, varname, default=_MARKER):
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99 """Get a (possibly substituted) variable and convert text to a
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100 boolean
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101
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102 """
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103 s = self.getvar_s(varname, default)
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104 if isinstance(s, self._TEXTTYPE):
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105 sl = s.strip().lower()
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106 if not sl in self._BOOL_CVT:
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107 raise ValueError("Not a boolean: %r" % s)
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108 return self._BOOL_CVT[sl]
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109 else:
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110 return s
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111
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112 # Conversion of booleans
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113 _BOOL_CVT = {'1': True, 'yes': True, 'true': True, 'on': True,
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114 '0': False, 'no': False, 'false': False, 'off': False}
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115
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116 def getfloatvar_s(self, varname, default=_MARKER):
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117 """Get a (possibly substituted) variable and convert text to a
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118 float
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119
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120 """
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121 s = self.getvar_s(varname, default)
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122 if isinstance(s, self._TEXTTYPE):
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123 return float(s)
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124 else:
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125 return s
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126
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127 def _split_ns(self, s):
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128 nameparts = s.split(':', 1)
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129 if len(nameparts) == 1:
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130 return (None, s, )
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131 else:
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132 return (nameparts[0], nameparts[1], )
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133
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134 def _split_filters(self, s):
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135 nameparts = s.split('|')
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136 if len(nameparts) == 1:
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137 return (s, [], )
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138 else:
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139 return (nameparts[0].rstrip(), nameparts[1:], )
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140
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141 def _lookupvar(self, key, default=_MARKER):
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142 """Lookup a variable.
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143
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144 If no default is given an unexisting `key` raises a `KeyError`
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145 else `default` is returned.
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146 """
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147 parts = key.split('.')
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148 try:
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149 v = self[parts[0]]
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150 for p in parts[1:]:
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151 v = v[p]
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152 except KeyError:
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153 if default is _MARKER:
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154 raise KeyError("Configuration variable %r not found" % key)
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155 else:
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156 return default
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157 return v
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158
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159 # Speed
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160 _TEXTTYPE = type(u(""))
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161
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162 def substitute_variables_in_obj(self, obj):
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163 """Recursively expand variables in the object tree `obj`."""
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164 if isinstance(obj, self._TEXTTYPE):
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165 # a string - really replace the value
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166 return self.expand_variable(obj)
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167 elif isinstance(obj, list):
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168 return [self.substitute_variables_in_obj(i) for i in obj]
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169 elif isinstance(obj, tuple):
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170 tmp = [self.substitute_variables_in_obj(i) for i in obj]
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171 return type(obj)(tmp)
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172 elif isinstance(obj, dict):
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173 newdict = type(obj)()
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174 for k in obj:
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175 newdict[k] = self.substitute_variables_in_obj(obj[k])
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176 return newdict
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177 elif isinstance(obj, set):
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178 newset = type(obj)()
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179 for i in obj:
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180 newset.add(self.substitute_variables_in_obj(i))
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181 else:
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182 return obj
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183
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184 # Speed
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185 _STARTTOK = u(b"{{")
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186 _ENDTOK = u(b"}}")
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187
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188 def expand_variable(self, s):
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189 """Expand variables in a single string"""
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190 start = s.find(self._STARTTOK, 0)
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191 while start != -1:
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192 end = s.find(self._ENDTOK, start)
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193 if end < 0:
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194 return s
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195 varname, filters = self._split_filters(s[start+2:end])
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196 varvalue = self._apply_filters(filters, self.getvar_s(varname))
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197 if varvalue is None:
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198 varvalue = u("")
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199 replaced = u(b"{0}{1}").format(s[:start], varvalue)
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200 s = u(b"{0}{1}").format(replaced, s[end+2:])
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201 # don't re-evaluate because `self.getvar_s()` expands already
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202 start = s.find(self._STARTTOK, len(replaced))
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203 return s
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204
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205 def _apply_filters(self, filters, value):
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206 for name in filters:
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207 try:
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208 filterfn = lookup_filter(name)
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209 except KeyError:
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210 raise NameError("Filter %r not found" % name)
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211 else:
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212 value = filterfn(self, value)
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213 return value