Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/config.py @ 16:f85dc4677c01

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Implemented the real configuration dictionary with attribute access or variable substitution
author Franz Glasner <hg@dom66.de>
date Thu, 10 Mar 2016 09:39:35 +0100
parents
children 94b5e94fae44
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16
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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 def getvar(self, varname, default=_MARKER):
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45 """Get a variable of the form ``[[ns1.]ns2.]name`` - including
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46 variables from other namespaces.
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47
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48 No variable expansion is done and no filters are applied.
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49 """
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50 varns, varname = self._split_ns(varname)
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51 try:
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52 if not varns:
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53 lookupfn = self._lookupvar
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54 else:
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55 lookupfn = lookup_varns(varns)
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56 varvalue = lookupfn(varname)
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57 except KeyError:
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58 if default is _MARKER:
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59 raise KeyError("Variable %r not found" % varname)
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60 else:
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61 return default
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62 else:
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63 return varvalue
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64
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65 def getvar_s(self, varname, default=_MARKER):
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66 """Get a variable - incliding variables from other namespaces.
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67
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68 Variables will be substituted recursively in the result.
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69 """
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70 try:
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71 obj = self.getvar(varname)
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72 return self.substitute_variables_in_obj(obj)
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73 except KeyError:
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74 if default is _MARKER:
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75 raise
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76 else:
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77 return default
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78
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79 def _split_ns(self, s):
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80 nameparts = s.split(':', 1)
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81 if len(nameparts) == 1:
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82 return (None, s, )
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83 else:
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84 return (nameparts[0], nameparts[1], )
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85
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86 def _split_filters(self, s):
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87 nameparts = s.split('|')
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88 if len(nameparts) == 1:
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89 return (s, [], )
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90 else:
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91 return (nameparts[0].rstrip(), nameparts[1:], )
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92
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93 def _lookupvar(self, key, default=_MARKER):
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94 """Lookup a variable.
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95
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96 If no default is given an unexisting `key` raises a `KeyError`
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97 else `default` is returned.
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98 """
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99 parts = key.split('.')
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100 try:
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101 v = self[parts[0]]
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102 for p in parts[1:]:
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103 v = v[p]
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104 except KeyError:
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105 if default is _MARKER:
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106 raise KeyError("Configuration variable %r not found" % key)
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107 else:
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108 return default
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109 return v
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110
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111 # Speed
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112 _TEXTTYPE = type(u(""))
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113
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114 def substitute_variables_in_obj(self, obj):
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115 """Recursively expand variables in the object tree `obj`."""
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116 if isinstance(obj, self._TEXTTYPE):
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117 # a string - really replace the value
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118 return self.expand_variable(obj)
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119 elif isinstance(obj, list):
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120 return [self.substitute_variables_in_obj(i) for i in obj]
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121 elif isinstance(obj, tuple):
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122 tmp = [self.substitute_variables_in_obj(i) for i in obj]
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123 return type(obj)(tmp)
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124 elif isinstance(obj, dict):
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125 newdict = type(obj)()
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126 for k in obj:
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127 newdict[k] = self.substitute_variables_in_obj(obj[k])
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128 return newdict
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129 elif isinstance(obj, set):
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130 newset = type(obj)()
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131 for i in obj:
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132 newset.add(self.substitute_variables_in_obj(i))
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133 else:
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134 return obj
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135
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136 # Speed
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137 _STARTTOK = u(b"{{")
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138 _ENDTOK = u(b"}}")
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139
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140 def expand_variable(self, s):
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141 """Expand variables in a single string"""
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142 start = s.find(self._STARTTOK, 0)
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143 while start != -1:
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144 end = s.find(self._ENDTOK, start)
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145 if end < 0:
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146 return s
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147 varname, filters = self._split_filters(s[start+2:end])
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148 varvalue = self._apply_filters(filters, self.getvar_s(varname))
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149 s = u(b"{0}{1}{2}").format(s[:start], varvalue, s[end+2:])
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150 # don't re-evaluate because `self.getvar_s()` expands already
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151 start = s.find(self._STARTTOK, start + len(varvalue))
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152 return s
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153
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154 def _apply_filters(self, filters, value):
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155 for name in filters:
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156 try:
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157 filterfn = lookup_filter(name)
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158 except KeyError:
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159 raise NameError("Filter %r not found" % name)
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160 else:
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161 value = filterfn(self, value)
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162 return value