Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/ini.py @ 97:1b4d95f60650

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Build a tree-ish configuration from an INI style configuration file
author Franz Glasner <hg@dom66.de>
date Sun, 18 Mar 2018 19:15:01 +0100
parents 218807d7d883
children ba5970a2dcef
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1 # -*- coding: utf-8 -*-
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2 #-
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3 # :Copyright: (c) 2015-2018, Franz Glasner. All rights reserved.
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4 # :License: 3-clause BSD. See LICENSE.txt for details.
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5 #-
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6 """Read INI-style configuration files.
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8 """
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9
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10 from __future__ import division, absolute_import, print_function
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11
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12 import sys
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13 import os
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14 import io
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15 import locale
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16 try:
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17 from configparser import SafeConfigParser, NoSectionError, NoOptionError
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18 except ImportError:
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19 from ConfigParser import SafeConfigParser, NoSectionError, NoOptionError
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20 try:
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21 from collections import OrderedDict as DictImpl
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22 except ImportError:
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23 try:
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24 from ordereddict import OrderedDict as DictImpl
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25 except ImportError:
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26 DictImpl = dict
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28 from .compat import PY2, u
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31 __all__ = ["INIConfigParser", "NoSectionError", "NoOptionError",
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32 "load"]
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35 class INIConfigParser(SafeConfigParser):
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36
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37 """A case sensitive config parser that returns all-unicode string
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38 values.
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40 """
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41
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42 def __init__(self, filename, executable=None, encoding=None):
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43 SafeConfigParser.__init__(self)
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44 if executable is None:
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45 executable = sys.argv[0]
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46 if PY2:
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47 if isinstance(filename, str):
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48 filename = filename.decode(locale.getpreferredencoding())
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49 if isinstance(executable, str):
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50 executable = executable.decode(locale.getpreferredencoding())
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51 self.executable = os.path.normpath(os.path.abspath(executable))
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52 if encoding is None:
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53 encoding = locale.getpreferredencoding()
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54 self.encoding = encoding
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55 with io.open(filename, mode="rt", encoding=self.encoding) as cf:
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56 self.readfp(cf, filename)
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57
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58 def optionxform(self, option):
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59 return option
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60
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61 def get_path_list(self, section, option):
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62 v = self.get(section, option)
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63 return v.split(os.pathsep)
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65 def read(self, filenames):
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66 """Not implemented. Use :meth:`readfp` instead"""
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67 raise NotImplementedError("use `readfp()' instead")
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69 def readfp(self, fp, filename):
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70 """Read from a file-like object `fp`.
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71
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72 The `fp` argument must have a `readline()` method.
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74 """
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75 if hasattr(self, "filename"):
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76 raise RuntimeError("already initialized")
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77 filename = os.path.normpath(os.path.abspath(filename))
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78 if PY2:
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79 if isinstance(filename, str):
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80 filename = filename.decode(locale.getpreferredencoding())
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81 self.set(None, u("self"), filename)
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82 self.set(None, u("here"), os.path.dirname(filename))
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83 self.set(None, u("root"), os.path.dirname(self.executable))
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84 SafeConfigParser.readfp(self, fp, filename=filename)
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85 self.filename = filename
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86 self.root = os.path.dirname(self.executable)
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88 def getx(self, section, option):
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89 """Extended `get()` with some automatic type conversion support.
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90
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91 Default: Fetch as string (like :meth:`get`).
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93 If annotated with ``:bool:`` fetch as bool, if annotated with
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94 ``:int:`` fetch as int, if annotated with ``:float:`` fetch as
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95 float.
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97 """
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98 v = self.get(section, option)
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99 if v.startswith(u(":bool:")):
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100 v = v[6:].lower()
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101 if v not in self._BOOL_CVT:
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102 raise ValueError("Not a boolean: %r" % v)
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103 return self._BOOL_CVT[v]
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104 elif v.startswith(u(":int:")):
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105 return int(v[5:], 0)
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106 elif v.startswith(u(":float:")):
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107 return float(v[7:])
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108 else:
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109 return v
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110
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111 _BOOL_CVT = {u('1'): True,
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112 u('yes'): True,
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113 u('true'): True,
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114 u('on'): True,
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115 u('0'): False,
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116 u('no'): False,
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117 u('false'): False,
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118 u('off'): False}
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119
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120 def itemsx(self, section, options):
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121 """Get all the options given in `options` of section `section`.
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122 Fetch them with :meth:`getx` in the order given.
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124 Return a list of ``(name, value)`` pairs for each option in
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125 `options` in the given `section`.
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127 """
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128 d = []
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129 for option in options:
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130 try:
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131 val = self.getx(section, option)
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132 except (NoSectionError, NoOptionError):
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133 pass
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134 else:
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135 d.append((option, val, ))
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136 return d
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137
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138 def items_as_dictx(self, section, options):
56
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139 """Similar to :meth:`itemsx` but return a (possibly ordered)
28
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140 dict instead of a list of key-value pairs.
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141
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142 """
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143 return DictImpl(self.itemsx(section, options))
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144
20
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145
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146 def load(filename, extract=["config"]):
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147 """Load a single INI file and read/interpolate the sections given in
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148 `extract`.
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149
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150 Flattens the given sections into the resulting dictionary.
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151
97
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152 Then build a tree out of sections which start with any of the `extract`
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153 content value and a point ``.``.
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154
20
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155 """
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156 conf = DictImpl()
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157 ini = INIConfigParser(filename)
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158 for sect in extract:
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159 try:
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160 cfg = ini.options(sect)
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161 except NoSectionError:
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162 pass
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163 else:
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164 for option in cfg:
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165 value = ini.getx(sect, option)
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166 conf[option] = value
97
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167 # try to read "<extract>.xxx" sections as tree
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168 for treemarker in [ e + '.' for e in extract ]:
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169 sections = list(ini.sections())
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170 sections.sort()
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171 for section in sections:
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172 cur_cfg = conf
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173 if section.startswith(treemarker):
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174 treestr = section[len(treemarker):]
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175 for treepart in treestr.split('.'):
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176 cur_cfg = cur_cfg.setdefault(treepart, DictImpl())
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177 for option in ini.options(section):
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178 value = ini.getx(section, option)
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179 cur_cfg[option] = value
20
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180 return conf