Mercurial > cpython-lru_cache-weakref

annotate Lib/ConfigParser.py @ 8831:00a6bb65ff29 legacy-trunk

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Getting rid of this ancient stuff.
author Guido van Rossum <guido@python.org>
date Wed, 05 Aug 1998 21:10:09 +0000
parents 64f0c3188e70
children bbe9d72bccda
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1 """Configuration file parser.
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2
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3 A setup file consists of sections, lead by a "[section]" header,
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4 and followed by "name: value" entries, with continuations and such in
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5 the style of RFC 822.
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6
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7 The option values can contain format strings which refer to other values in
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8 the same section, or values in a special [DEFAULT] section.
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9
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10 For example:
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11
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12 something: %(dir)s/whatever
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13
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14 would resolve the "%(dir)s" to the value of dir. All reference
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15 expansions are done late, on demand.
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16
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17 Intrinsic defaults can be specified by passing them into the
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18 ConfigParser constructor as a dictionary.
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19
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20 class:
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21
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22 ConfigParser -- responsible for for parsing a list of
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23 configuration files, and managing the parsed database.
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24
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25 methods:
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26
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27 __init__(defaults=None) -- create the parser and specify a
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28 dictionary of intrinsic defaults. The
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29 keys must be strings, the values must
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30 be appropriate for %()s string
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31 interpolation. Note that `name' is
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32 always an intrinsic default; it's value
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33 is the section's name.
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34
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35 sections() -- return all the configuration section names, sans DEFAULT
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36
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37 options(section) -- return list of configuration options for the named
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38 section
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39
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40 read(*filenames) -- read and parse the list of named configuration files
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41
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42 get(section, option, raw=0) -- return a string value for the named
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43 option. All % interpolations are
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44 expanded in the return values, based on
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45 the defaults passed into the constructor
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46 and the DEFAULT section.
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47
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48 getint(section, options) -- like get(), but convert value to an integer
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49
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50 getfloat(section, options) -- like get(), but convert value to a float
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51
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52 getboolean(section, options) -- like get(), but convert value to
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53 a boolean (currently defined as 0
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54 or 1, only)
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55 """
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56
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57 import sys
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58 import string
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59 import re
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60
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61 DEFAULTSECT = "DEFAULT"
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62
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64
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65 # exception classes
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66 class Error:
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67 def __init__(self, msg=''):
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68 self._msg = msg
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69 def __repr__(self):
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70 return self._msg
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71
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72 class NoSectionError(Error):
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73 def __init__(self, section):
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74 Error.__init__(self, 'No section: %s' % section)
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75 self.section = section
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76
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77 class DuplicateSectionError(Error):
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78 def __init__(self, section):
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79 Error.__init__(self, "Section %s already exists" % section)
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80 self.section = section
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81
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82 class NoOptionError(Error):
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83 def __init__(self, option, section):
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84 Error.__init__(self, "No option `%s' in section: %s" %
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85 (option, section))
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86 self.option = option
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87 self.section = section
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88
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89 class InterpolationError(Error):
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90 def __init__(self, reference, option, section):
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91 Error.__init__(self,
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92 "Bad value substitution: sect `%s', opt `%s', ref `%s'"
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93 % (section, option, reference))
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94 self.reference = reference
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95 self.option = option
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96 self.section = section
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97
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98 class MissingSectionHeaderError(Error):
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99 def __init__(self, filename, lineno, line):
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100 Error.__init__(
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101 self,
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102 'File contains no section headers.\nfile: %s, line: %d\n%s' %
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103 (filename, lineno, line))
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104 self.filename = filename
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105 self.lineno = lineno
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106 self.line = line
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107
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108 class ParsingError(Error):
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109 def __init__(self, filename):
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110 Error.__init__(self, 'File contains parsing errors: %s' % filename)
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111 self.filename = filename
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112 self.errors = []
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113
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114 def append(self, lineno, line):
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115 self.errors.append((lineno, line))
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116 self._msg = self._msg + '\n\t[line %2d]: %s' % (lineno, line)
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117
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118
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119
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120 class ConfigParser:
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121 def __init__(self, defaults=None):
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122 self.__sections = {}
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123 if defaults is None:
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124 self.__defaults = {}
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125 else:
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126 self.__defaults = defaults
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127
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128 def defaults(self):
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129 return self.__defaults
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130
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131 def sections(self):
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132 """Return a list of section names, excluding [DEFAULT]"""
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133 # self.__sections will never have [DEFAULT] in it
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134 return self.__sections.keys()
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135
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136 def add_section(self, section):
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137 """Create a new section in the configuration.
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138
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139 Raise DuplicateSectionError if a section by the specified name
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140 already exists.
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141 """
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142 if self.__sections.has_key(section):
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143 raise DuplicateSectionError(section)
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144 self.__sections[section] = {}
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145
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146 def has_section(self, section):
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147 """Indicate whether the named section is present in the configuration.
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148
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149 The DEFAULT section is not acknowledged.
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150 """
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151 return self.__sections.has_key(section)
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152
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153 def options(self, section):
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154 try:
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155 opts = self.__sections[section].copy()
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156 except KeyError:
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157 raise NoSectionError(section)
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158 opts.update(self.__defaults)
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159 return opts.keys()
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160
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161 def read(self, filenames):
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162 """Read and parse a list of filenames."""
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163 if type(filenames) is type(''):
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164 filenames = [filenames]
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165 for file in filenames:
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166 try:
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167 fp = open(file, 'r')
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168 self.__read(fp)
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169 except IOError:
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170 pass
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171
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172 def get(self, section, option, raw=0):
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173 """Get an option value for a given section.
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174
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175 All % interpolations are expanded in the return values, based
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176 on the defaults passed into the constructor, unless the optional
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177 argument `raw' is true.
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178
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179 The section DEFAULT is special.
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180 """
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181 try:
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182 sectdict = self.__sections[section].copy()
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183 except KeyError:
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184 if section == DEFAULTSECT:
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185 sectdict = {}
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186 else:
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187 raise NoSectionError(section)
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188 d = self.__defaults.copy()
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189 d.update(sectdict)
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190 option = string.lower(option)
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191 try:
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192 rawval = d[option]
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193 except KeyError:
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194 raise NoOptionError(option, section)
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195 # do the string interpolation
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196 if raw:
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197 return rawval
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198 try:
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199 return rawval % d
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200 except KeyError, key:
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201 raise InterpolationError(key, option, section)
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202
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203 def __get(self, section, conv, option):
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204 return conv(self.get(section, option))
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205
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206 def getint(self, section, option):
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207 return self.__get(section, string.atoi, option)
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208
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209 def getfloat(self, section, option):
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210 return self.__get(section, string.atof, option)
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211
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212 def getboolean(self, section, option):
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213 v = self.get(section, option)
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214 val = string.atoi(v)
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215 if val not in (0, 1):
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216 raise ValueError, 'Not a boolean: %s' % v
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217 return val
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218
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219 #
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220 # Regular expressions for parsing section headers and options. Note a
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221 # slight semantic change from the previous version, because of the use
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222 # of \w, _ is allowed in section header names.
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223 __SECTCRE = re.compile(
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224 r'\[' # [
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225 r'(?P<header>[-\w]+)' # `-', `_' or any alphanum
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226 r'\]' # ]
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227 )
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228 __OPTCRE = re.compile(
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229 r'(?P<option>[-.\w]+)' # - . _ alphanum
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230 r'[ \t]*[:=][ \t]*' # any number of space/tab,
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231 # followed by separator
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232 # (either : or =), followed
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233 # by any # space/tab
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234 r'(?P<value>.*)$' # everything up to eol
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235 )
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236
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237 def __read(self, fp):
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238 """Parse a sectioned setup file.
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239
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240 The sections in setup file contains a title line at the top,
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241 indicated by a name in square brackets (`[]'), plus key/value
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242 options lines, indicated by `name: value' format lines.
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243 Continuation are represented by an embedded newline then
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244 leading whitespace. Blank lines, lines beginning with a '#',
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245 and just about everything else is ignored.
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246 """
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247 cursect = None # None, or a dictionary
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248 optname = None
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249 lineno = 0
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250 e = None # None, or an exception
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251 while 1:
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252 line = fp.readline()
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253 if not line:
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254 break
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255 lineno = lineno + 1
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256 # comment or blank line?
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257 if string.strip(line) == '' or line[0] in '#;':
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258 continue
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259 if string.lower(string.split(line)[0]) == 'rem' \
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260 and line[0] == "r": # no leading whitespace
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261 continue
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262 # continuation line?
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263 if line[0] in ' \t' and cursect is not None and optname:
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264 value = string.strip(line)
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265 if value:
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266 cursect[optname] = cursect[optname] + '\n ' + value
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267 # a section header or option header?
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268 else:
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269 # is it a section header?
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270 mo = self.__SECTCRE.match(line)
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271 if mo:
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272 sectname = mo.group('header')
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273 if self.__sections.has_key(sectname):
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274 cursect = self.__sections[sectname]
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275 elif sectname == DEFAULTSECT:
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276 cursect = self.__defaults
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277 else:
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278 cursect = {}
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279 self.__sections[sectname] = cursect
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280 # So sections can't start with a continuation line
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281 optname = None
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282 # no section header in the file?
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283 elif cursect is None:
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284 raise MissingSectionHeaderError(fp.name, lineno, `line`)
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285 # an option line?
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286 else:
8614
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287 mo = self.__OPTCRE.match(line)
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288 if mo:
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289 optname, optval = mo.group('option', 'value')
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290 optname = string.lower(optname)
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291 optval = string.strip(optval)
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292 # allow empty values
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293 if optval == '""':
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294 optval = ''
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295 cursect[optname] = optval
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296 else:
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297 # a non-fatal parsing error occurred. set up the
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298 # exception but keep going. the exception will be
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299 # raised at the end of the file and will contain a
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300 # list of all bogus lines
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301 if not e:
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302 e = ParsingError(fp.name)
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303 e.append(lineno, `line`)
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304 # if any parsing errors occurred, raise an exception
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305 if e:
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306 raise e