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annotate configmix/ini.py @ 28:7c7955da42ab

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An extended `itemsx()` method for INI-style configuration files to get interpreted selected options from a section
author Franz Glasner <f.glasner@feldmann-mg.com>
date Wed, 16 Mar 2016 12:41:57 +0100
parents ce290b10dac5
children aa8345dae995
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1 # -*- coding: utf-8 -*-
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2 r"""Read INI-style configuration files.
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3
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4 """
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5
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6 from __future__ import division, absolute_import, print_function
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7
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8 import sys
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9 import os
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10 import io
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11 import locale
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12 try:
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13 from configparser import SafeConfigParser, NoSectionError, NoOptionError
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14 except ImportError:
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15 from ConfigParser import SafeConfigParser, NoSectionError, NoOptionError
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16 try:
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17 from collections import OrderedDict as DictImpl
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18 except ImportError:
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19 try:
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20 from ordereddict import OrderedDict as DictImpl
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21 except ImportError:
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22 DictImpl = dict
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23
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24 from .compat import PY2, u
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27 __all__ = ["INIConfigParser", "NoSectionError", "NoOptionError",
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28 "load"]
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31 class INIConfigParser(SafeConfigParser):
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32
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33 """A case sensitive config parser that returns all-unicode string
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34 values.
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35
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36 """
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37
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38 def __init__(self, filename, executable=None, encoding=None):
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39 SafeConfigParser.__init__(self)
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40 if executable is None:
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41 executable = sys.argv[0]
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42 if PY2:
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43 if isinstance(filename, str):
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44 filename = filename.decode(locale.getpreferredencoding())
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45 if isinstance(executable, str):
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46 executable = executable.decode(locale.getpreferredencoding())
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47 self.executable = os.path.normpath(os.path.abspath(executable))
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48 if encoding is None:
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49 encoding = locale.getpreferredencoding()
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50 self.encoding = encoding
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51 with io.open(filename, mode="rt", encoding=self.encoding) as cf:
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52 self.readfp(cf, filename)
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53
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54 def optionxform(self, option):
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55 return option
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56
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57 def get_path_list(self, section, option):
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58 v = self.get(section, option)
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59 return v.split(os.pathsep)
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60
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61 def read(self, filenames):
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62 raise NotImplementedError("use `readfp()' instead")
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64 def readfp(self, fp, filename):
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65 if hasattr(self, "filename"):
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66 raise RuntimeError("already initialized")
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67 filename = os.path.normpath(os.path.abspath(filename))
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68 if PY2:
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69 if isinstance(filename, str):
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70 filename = filename.decode(locale.getpreferredencoding())
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71 self.set(None, u("self"), filename)
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72 self.set(None, u("here"), os.path.dirname(filename))
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73 self.set(None, u("root"), os.path.dirname(self.executable))
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74 SafeConfigParser.readfp(self, fp, filename=filename)
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75 self.filename = filename
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76 self.root = os.path.dirname(self.executable)
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78 def getx(self, section, option):
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79 """Extended get() with some automatic type conversion support.
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80
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81 Default: Fetch as string (like `get()`).
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82
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83 If annotated with ``:bool:`` fetch as bool, if annotated with
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84 ``:int:`` fetch as int, if annotated with ``:float:`` fetch as
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85 float.
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86
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87 """
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88 v = self.get(section, option)
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89 if v.startswith(u(":bool:")):
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90 v = v[6:].lower()
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91 if v not in self._BOOL_CVT:
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92 raise ValueError("Not a boolean: %r" % v)
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93 return self._BOOL_CVT[v]
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94 elif v.startswith(u(":int:")):
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95 return int(v[5:], 0)
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96 elif v.startswith(u(":float:")):
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97 return float(v[7:])
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98 else:
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99 return v
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100
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101 _BOOL_CVT = {u('1'): True,
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102 u('yes'): True,
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103 u('true'): True,
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104 u('on'): True,
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105 u('0'): False,
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106 u('no'): False,
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107 u('false'): False,
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108 u('off'): False}
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109
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110 def itemsx(self, section, options):
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111 """Get all the options given in `options` of section `section`.
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112 Fetch them with `self.getx()` in the order given.
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114 Return a list of ``(name, value)`` pairs for each option in
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115 `options` in the given `section`.
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117 """
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118 d = []
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119 for option in options:
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120 try:
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121 val = self.getx(section, option)
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122 except (NoSectionError, NoOptionError):
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123 pass
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124 else:
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125 d.append((option, val, ))
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126 return d
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128 def items_as_dictx(self, section, options):
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129 """Similar to `self.itemsx()` but return a (possibly ordered)
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130 dict instead of a list of key-value pairs.
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131
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132 """
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133 return DictImpl(self.itemsx(section, options))
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134
20
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135
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136 def load(filename, extract=["config"]):
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137 """Load a single INI file and read/interpolate the sections given in
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138 `extract`.
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139
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140 Flattens the given sections into the resulting dictionary.
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141
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142 """
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143 conf = DictImpl()
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144 ini = INIConfigParser(filename)
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145 for sect in extract:
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146 try:
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147 cfg = ini.options(sect)
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148 except NoSectionError:
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149 pass
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150 else:
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151 for option in cfg:
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152 value = ini.getx(sect, option)
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153 conf[option] = value
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154 return conf