Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/config.py @ 18:a04fa81e10ae

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author Franz Glasner <f.glasner@feldmann-mg.com>
date Thu, 10 Mar 2016 10:45:09 +0100
parents 94b5e94fae44
children c77cb6bc8eeb
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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 - incliding 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 _split_ns(self, s):
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88 nameparts = s.split(':', 1)
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89 if len(nameparts) == 1:
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90 return (None, s, )
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91 else:
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92 return (nameparts[0], nameparts[1], )
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93
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94 def _split_filters(self, s):
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95 nameparts = s.split('|')
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96 if len(nameparts) == 1:
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97 return (s, [], )
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98 else:
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99 return (nameparts[0].rstrip(), nameparts[1:], )
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100
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101 def _lookupvar(self, key, default=_MARKER):
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102 """Lookup a variable.
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103
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104 If no default is given an unexisting `key` raises a `KeyError`
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105 else `default` is returned.
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106 """
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107 parts = key.split('.')
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108 try:
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109 v = self[parts[0]]
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110 for p in parts[1:]:
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111 v = v[p]
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112 except KeyError:
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113 if default is _MARKER:
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114 raise KeyError("Configuration variable %r not found" % key)
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115 else:
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116 return default
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117 return v
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118
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119 # Speed
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120 _TEXTTYPE = type(u(""))
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121
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122 def substitute_variables_in_obj(self, obj):
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123 """Recursively expand variables in the object tree `obj`."""
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124 if isinstance(obj, self._TEXTTYPE):
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125 # a string - really replace the value
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126 return self.expand_variable(obj)
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127 elif isinstance(obj, list):
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128 return [self.substitute_variables_in_obj(i) for i in obj]
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129 elif isinstance(obj, tuple):
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130 tmp = [self.substitute_variables_in_obj(i) for i in obj]
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131 return type(obj)(tmp)
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132 elif isinstance(obj, dict):
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133 newdict = type(obj)()
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134 for k in obj:
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135 newdict[k] = self.substitute_variables_in_obj(obj[k])
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136 return newdict
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137 elif isinstance(obj, set):
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138 newset = type(obj)()
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139 for i in obj:
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140 newset.add(self.substitute_variables_in_obj(i))
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141 else:
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142 return obj
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143
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144 # Speed
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145 _STARTTOK = u(b"{{")
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146 _ENDTOK = u(b"}}")
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147
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148 def expand_variable(self, s):
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149 """Expand variables in a single string"""
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150 start = s.find(self._STARTTOK, 0)
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151 while start != -1:
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152 end = s.find(self._ENDTOK, start)
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153 if end < 0:
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154 return s
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155 varname, filters = self._split_filters(s[start+2:end])
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156 varvalue = self._apply_filters(filters, self.getvar_s(varname))
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157 s = u(b"{0}{1}{2}").format(s[:start], varvalue, s[end+2:])
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158 # don't re-evaluate because `self.getvar_s()` expands already
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159 start = s.find(self._STARTTOK, start + len(varvalue))
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160 return s
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161
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162 def _apply_filters(self, filters, value):
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163 for name in filters:
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164 try:
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165 filterfn = lookup_filter(name)
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166 except KeyError:
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167 raise NameError("Filter %r not found" % name)
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168 else:
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169 value = filterfn(self, value)
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170 return value