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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 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) |
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28 create the parser and specify a dictionary of intrinsic defaults. The |
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29 keys must be strings, the values must be appropriate for %()s string |
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30 interpolation. Note that `__name__' is always an intrinsic default; |
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31 its value is the section's name. |
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32 |
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33 sections() |
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34 return all the configuration section names, sans DEFAULT |
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35 |
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36 has_section(section) |
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37 return whether the given section exists |
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38 |
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39 has_option(section, option) |
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40 return whether the given option exists in the given section |
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41 |
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42 options(section) |
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43 return list of configuration options for the named section |
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44 |
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45 read(filenames) |
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46 read and parse the list of named configuration files, given by |
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47 name. A single filename is also allowed. Non-existing files |
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48 are ignored. Return list of successfully read files. |
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49 |
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50 readfp(fp, filename=None) |
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51 read and parse one configuration file, given as a file object. |
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52 The filename defaults to fp.name; it is only used in error |
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53 messages (if fp has no `name' attribute, the string `<???>' is used). |
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54 |
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55 get(section, option, raw=False, vars=None) |
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56 return a string value for the named option. All % interpolations are |
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57 expanded in the return values, based on the defaults passed into the |
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58 constructor and the DEFAULT section. Additional substitutions may be |
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59 provided using the `vars' argument, which must be a dictionary whose |
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60 contents override any pre-existing defaults. |
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61 |
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62 getint(section, options) |
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63 like get(), but convert value to an integer |
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64 |
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65 getfloat(section, options) |
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66 like get(), but convert value to a float |
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67 |
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68 getboolean(section, options) |
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69 like get(), but convert value to a boolean (currently case |
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70 insensitively defined as 0, false, no, off for False, and 1, true, |
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71 yes, on for True). Returns False or True. |
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72 |
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73 items(section, raw=False, vars=None) |
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74 return a list of tuples with (name, value) for each option |
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75 in the section. |
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76 |
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77 remove_section(section) |
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78 remove the given file section and all its options |
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79 |
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80 remove_option(section, option) |
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81 remove the given option from the given section |
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82 |
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83 set(section, option, value) |
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84 set the given option |
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85 |
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86 write(fp) |
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87 write the configuration state in .ini format |
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88 """ |
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89 |
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90 import re |
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91 |
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92 __all__ = ["NoSectionError", "DuplicateSectionError", "NoOptionError", |
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93 "InterpolationError", "InterpolationDepthError", |
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94 "InterpolationSyntaxError", "ParsingError", |
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95 "MissingSectionHeaderError", |
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96 "ConfigParser", "SafeConfigParser", "RawConfigParser", |
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97 "DEFAULTSECT", "MAX_INTERPOLATION_DEPTH"] |
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98 |
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99 DEFAULTSECT = "DEFAULT" |
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100 |
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101 MAX_INTERPOLATION_DEPTH = 10 |
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102 |
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103 |
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104 |
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105 # exception classes |
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106 class Error(Exception): |
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107 """Base class for ConfigParser exceptions.""" |
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108 |
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109 def _get_message(self): |
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110 """Getter for 'message'; needed only to override deprecation in |
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111 BaseException.""" |
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112 return self.__message |
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113 |
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114 def _set_message(self, value): |
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115 """Setter for 'message'; needed only to override deprecation in |
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116 BaseException.""" |
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117 self.__message = value |
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118 |
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119 # BaseException.message has been deprecated since Python 2.6. To prevent |
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120 # DeprecationWarning from popping up over this pre-existing attribute, use |
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121 # a new property that takes lookup precedence. |
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122 message = property(_get_message, _set_message) |
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123 |
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124 def __init__(self, msg=''): |
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125 self.message = msg |
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126 Exception.__init__(self, msg) |
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127 |
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128 def __repr__(self): |
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129 return self.message |
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130 |
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131 __str__ = __repr__ |
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132 |
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133 class NoSectionError(Error): |
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134 """Raised when no section matches a requested option.""" |
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135 |
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136 def __init__(self, section): |
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137 Error.__init__(self, 'No section: %r' % (section,)) |
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138 self.section = section |
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139 |
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140 class DuplicateSectionError(Error): |
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141 """Raised when a section is multiply-created.""" |
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142 |
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143 def __init__(self, section): |
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144 Error.__init__(self, "Section %r already exists" % section) |
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145 self.section = section |
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146 |
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147 class NoOptionError(Error): |
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148 """A requested option was not found.""" |
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149 |
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150 def __init__(self, option, section): |
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151 Error.__init__(self, "No option %r in section: %r" % |
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152 (option, section)) |
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153 self.option = option |
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154 self.section = section |
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155 |
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156 class InterpolationError(Error): |
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157 """Base class for interpolation-related exceptions.""" |
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158 |
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159 def __init__(self, option, section, msg): |
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160 Error.__init__(self, msg) |
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161 self.option = option |
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162 self.section = section |
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163 |
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164 class InterpolationMissingOptionError(InterpolationError): |
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165 """A string substitution required a setting which was not available.""" |
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166 |
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167 def __init__(self, option, section, rawval, reference): |
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168 msg = ("Bad value substitution:\n" |
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169 "\tsection: [%s]\n" |
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170 "\toption : %s\n" |
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171 "\tkey : %s\n" |
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172 "\trawval : %s\n" |
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173 % (section, option, reference, rawval)) |
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174 InterpolationError.__init__(self, option, section, msg) |
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175 self.reference = reference |
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176 |
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177 class InterpolationSyntaxError(InterpolationError): |
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178 """Raised when the source text into which substitutions are made |
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179 does not conform to the required syntax.""" |
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180 |
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181 class InterpolationDepthError(InterpolationError): |
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182 """Raised when substitutions are nested too deeply.""" |
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183 |
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184 def __init__(self, option, section, rawval): |
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185 msg = ("Value interpolation too deeply recursive:\n" |
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186 "\tsection: [%s]\n" |
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187 "\toption : %s\n" |
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188 "\trawval : %s\n" |
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189 % (section, option, rawval)) |
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190 InterpolationError.__init__(self, option, section, msg) |
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191 |
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192 class ParsingError(Error): |
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193 """Raised when a configuration file does not follow legal syntax.""" |
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194 |
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195 def __init__(self, filename): |
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196 Error.__init__(self, 'File contains parsing errors: %s' % filename) |
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197 self.filename = filename |
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198 self.errors = [] |
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199 |
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200 def append(self, lineno, line): |
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201 self.errors.append((lineno, line)) |
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202 self.message += '\n\t[line %2d]: %s' % (lineno, line) |
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203 |
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204 class MissingSectionHeaderError(ParsingError): |
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205 """Raised when a key-value pair is found before any section header.""" |
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206 |
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207 def __init__(self, filename, lineno, line): |
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208 Error.__init__( |
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209 self, |
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210 'File contains no section headers.\nfile: %s, line: %d\n%r' % |
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211 (filename, lineno, line)) |
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212 self.filename = filename |
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213 self.lineno = lineno |
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214 self.line = line |
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215 |
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216 |
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217 class RawConfigParser: |
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218 def __init__(self, defaults=None, dict_type=dict): |
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219 self._dict = dict_type |
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220 self._sections = self._dict() |
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221 self._defaults = self._dict() |
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222 if defaults: |
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223 for key, value in defaults.items(): |
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224 self._defaults[self.optionxform(key)] = value |
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225 |
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226 def defaults(self): |
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227 return self._defaults |
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228 |
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229 def sections(self): |
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230 """Return a list of section names, excluding [DEFAULT]""" |
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231 # self._sections will never have [DEFAULT] in it |
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232 return self._sections.keys() |
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233 |
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234 def add_section(self, section): |
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235 """Create a new section in the configuration. |
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236 |
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237 Raise DuplicateSectionError if a section by the specified name |
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238 already exists. Raise ValueError if name is DEFAULT or any of it's |
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239 case-insensitive variants. |
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240 """ |
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241 if section.lower() == "default": |
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242 raise ValueError, 'Invalid section name: %s' % section |
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243 |
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244 if section in self._sections: |
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245 raise DuplicateSectionError(section) |
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246 self._sections[section] = self._dict() |
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247 |
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248 def has_section(self, section): |
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249 """Indicate whether the named section is present in the configuration. |
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250 |
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251 The DEFAULT section is not acknowledged. |
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252 """ |
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253 return section in self._sections |
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254 |
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255 def options(self, section): |
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256 """Return a list of option names for the given section name.""" |
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257 try: |
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258 opts = self._sections[section].copy() |
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259 except KeyError: |
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260 raise NoSectionError(section) |
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261 opts.update(self._defaults) |
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262 if '__name__' in opts: |
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263 del opts['__name__'] |
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264 return opts.keys() |
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265 |
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266 def read(self, filenames): |
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267 """Read and parse a filename or a list of filenames. |
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268 |
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269 Files that cannot be opened are silently ignored; this is |
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270 designed so that you can specify a list of potential |
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271 configuration file locations (e.g. current directory, user's |
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272 home directory, systemwide directory), and all existing |
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273 configuration files in the list will be read. A single |
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274 filename may also be given. |
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275 |
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276 Return list of successfully read files. |
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277 """ |
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278 if isinstance(filenames, basestring): |
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279 filenames = [filenames] |
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280 read_ok = [] |
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281 for filename in filenames: |
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282 try: |
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283 fp = open(filename) |
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284 except IOError: |
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285 continue |
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286 self._read(fp, filename) |
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287 fp.close() |
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288 read_ok.append(filename) |
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289 return read_ok |
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290 |
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291 def readfp(self, fp, filename=None): |
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292 """Like read() but the argument must be a file-like object. |
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293 |
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294 The `fp' argument must have a `readline' method. Optional |
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295 second argument is the `filename', which if not given, is |
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296 taken from fp.name. If fp has no `name' attribute, `<???>' is |
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297 used. |
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298 |
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299 """ |
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300 if filename is None: |
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301 try: |
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302 filename = fp.name |
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303 except AttributeError: |
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304 filename = '<???>' |
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305 self._read(fp, filename) |
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306 |
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307 def get(self, section, option): |
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308 opt = self.optionxform(option) |
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309 if section not in self._sections: |
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310 if section != DEFAULTSECT: |
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311 raise NoSectionError(section) |
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312 if opt in self._defaults: |
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313 return self._defaults[opt] |
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314 else: |
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315 raise NoOptionError(option, section) |
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316 elif opt in self._sections[section]: |
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317 return self._sections[section][opt] |
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318 elif opt in self._defaults: |
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319 return self._defaults[opt] |
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320 else: |
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321 raise NoOptionError(option, section) |
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322 |
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323 def items(self, section): |
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324 try: |
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325 d2 = self._sections[section] |
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326 except KeyError: |
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327 if section != DEFAULTSECT: |
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328 raise NoSectionError(section) |
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329 d2 = self._dict() |
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330 d = self._defaults.copy() |
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331 d.update(d2) |
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332 if "__name__" in d: |
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333 del d["__name__"] |
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334 return d.items() |
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335 |
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336 def _get(self, section, conv, option): |
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337 return conv(self.get(section, option)) |
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338 |
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339 def getint(self, section, option): |
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340 return self._get(section, int, option) |
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341 |
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342 def getfloat(self, section, option): |
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343 return self._get(section, float, option) |
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344 |
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345 _boolean_states = {'1': True, 'yes': True, 'true': True, 'on': True, |
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346 '0': False, 'no': False, 'false': False, 'off': False} |
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347 |
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348 def getboolean(self, section, option): |
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349 v = self.get(section, option) |
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350 if v.lower() not in self._boolean_states: |
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351 raise ValueError, 'Not a boolean: %s' % v |
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352 return self._boolean_states[v.lower()] |
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353 |
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354 def optionxform(self, optionstr): |
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355 return optionstr.lower() |
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356 |
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357 def has_option(self, section, option): |
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358 """Check for the existence of a given option in a given section.""" |
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359 if not section or section == DEFAULTSECT: |
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360 option = self.optionxform(option) |
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361 return option in self._defaults |
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362 elif section not in self._sections: |
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363 return False |
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364 else: |
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365 option = self.optionxform(option) |
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366 return (option in self._sections[section] |
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367 or option in self._defaults) |
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368 |
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369 def set(self, section, option, value): |
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370 """Set an option.""" |
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371 if not section or section == DEFAULTSECT: |
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372 sectdict = self._defaults |
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373 else: |
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374 try: |
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375 sectdict = self._sections[section] |
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376 except KeyError: |
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377 raise NoSectionError(section) |
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378 sectdict[self.optionxform(option)] = value |
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379 |
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380 def write(self, fp): |
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381 """Write an .ini-format representation of the configuration state.""" |
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382 if self._defaults: |
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383 fp.write("[%s]\n" % DEFAULTSECT) |
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384 for (key, value) in self._defaults.items(): |
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385 fp.write("%s = %s\n" % (key, str(value).replace('\n', '\n\t'))) |
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386 fp.write("\n") |
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387 for section in self._sections: |
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388 fp.write("[%s]\n" % section) |
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389 for (key, value) in self._sections[section].items(): |
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390 if key != "__name__": |
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391 fp.write("%s = %s\n" % |
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392 (key, str(value).replace('\n', '\n\t'))) |
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393 fp.write("\n") |
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394 |
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395 def remove_option(self, section, option): |
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396 """Remove an option.""" |
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397 if not section or section == DEFAULTSECT: |
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398 sectdict = self._defaults |
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399 else: |
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400 try: |
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401 sectdict = self._sections[section] |
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402 except KeyError: |
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403 raise NoSectionError(section) |
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404 option = self.optionxform(option) |
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405 existed = option in sectdict |
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406 if existed: |
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407 del sectdict[option] |
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408 return existed |
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409 |
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410 def remove_section(self, section): |
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411 """Remove a file section.""" |
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412 existed = section in self._sections |
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413 if existed: |
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414 del self._sections[section] |
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415 return existed |
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416 |
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417 # |
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418 # Regular expressions for parsing section headers and options. |
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419 # |
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420 SECTCRE = re.compile( |
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421 r'\[' # [ |
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422 r'(?P<header>[^]]+)' # very permissive! |
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423 r'\]' # ] |
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424 ) |
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425 OPTCRE = re.compile( |
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426 r'(?P<option>[^:=\s][^:=]*)' # very permissive! |
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427 r'\s*(?P<vi>[:=])\s*' # any number of space/tab, |
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428 # followed by separator |
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429 # (either : or =), followed |
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430 # by any # space/tab |
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431 r'(?P<value>.*)$' # everything up to eol |
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432 ) |
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433 |
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434 def _read(self, fp, fpname): |
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435 """Parse a sectioned setup file. |
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436 |
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437 The sections in setup file contains a title line at the top, |
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438 indicated by a name in square brackets (`[]'), plus key/value |
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439 options lines, indicated by `name: value' format lines. |
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440 Continuations are represented by an embedded newline then |
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441 leading whitespace. Blank lines, lines beginning with a '#', |
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442 and just about everything else are ignored. |
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443 """ |
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444 cursect = None # None, or a dictionary |
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445 optname = None |
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446 lineno = 0 |
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447 e = None # None, or an exception |
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448 while True: |
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449 line = fp.readline() |
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450 if not line: |
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451 break |
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452 lineno = lineno + 1 |
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453 # comment or blank line? |
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454 if line.strip() == '' or line[0] in '#;': |
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455 continue |
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456 if line.split(None, 1)[0].lower() == 'rem' and line[0] in "rR": |
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457 # no leading whitespace |
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458 continue |
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459 # continuation line? |
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460 if line[0].isspace() and cursect is not None and optname: |
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461 value = line.strip() |
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462 if value: |
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463 cursect[optname] = "%s\n%s" % (cursect[optname], value) |
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464 # a section header or option header? |
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465 else: |
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466 # is it a section header? |
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467 mo = self.SECTCRE.match(line) |
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468 if mo: |
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469 sectname = mo.group('header') |
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470 if sectname in self._sections: |
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471 cursect = self._sections[sectname] |
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472 elif sectname == DEFAULTSECT: |
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473 cursect = self._defaults |
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474 else: |
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475 cursect = self._dict() |
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476 cursect['__name__'] = sectname |
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477 self._sections[sectname] = cursect |
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478 # So sections can't start with a continuation line |
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479 optname = None |
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480 # no section header in the file? |
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481 elif cursect is None: |
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482 raise MissingSectionHeaderError(fpname, lineno, line) |
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483 # an option line? |
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484 else: |
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485 mo = self.OPTCRE.match(line) |
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486 if mo: |
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487 optname, vi, optval = mo.group('option', 'vi', 'value') |
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488 if vi in ('=', ':') and ';' in optval: |
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489 # ';' is a comment delimiter only if it follows |
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490 # a spacing character |
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491 pos = optval.find(';') |
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492 if pos != -1 and optval[pos-1].isspace(): |
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493 optval = optval[:pos] |
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494 optval = optval.strip() |
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495 # allow empty values |
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496 if optval == '""': |
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497 optval = '' |
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498 optname = self.optionxform(optname.rstrip()) |
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499 cursect[optname] = optval |
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500 else: |
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501 # a non-fatal parsing error occurred. set up the |
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502 # exception but keep going. the exception will be |
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503 # raised at the end of the file and will contain a |
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504 # list of all bogus lines |
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505 if not e: |
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506 e = ParsingError(fpname) |
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507 e.append(lineno, repr(line)) |
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508 # if any parsing errors occurred, raise an exception |
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509 if e: |
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510 raise e |
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511 |
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512 |
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513 class ConfigParser(RawConfigParser): |
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514 |
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515 def get(self, section, option, raw=False, vars=None): |
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516 """Get an option value for a given section. |
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517 |
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518 All % interpolations are expanded in the return values, based on the |
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519 defaults passed into the constructor, unless the optional argument |
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520 `raw' is true. Additional substitutions may be provided using the |
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521 `vars' argument, which must be a dictionary whose contents overrides |
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522 any pre-existing defaults. |
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523 |
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524 The section DEFAULT is special. |
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525 """ |
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526 d = self._defaults.copy() |
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527 try: |
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528 d.update(self._sections[section]) |
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529 except KeyError: |
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530 if section != DEFAULTSECT: |
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531 raise NoSectionError(section) |
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532 # Update with the entry specific variables |
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533 if vars: |
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534 for key, value in vars.items(): |
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535 d[self.optionxform(key)] = value |
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536 option = self.optionxform(option) |
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537 try: |
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538 value = d[option] |
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539 except KeyError: |
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540 raise NoOptionError(option, section) |
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541 |
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542 if raw: |
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543 return value |
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544 else: |
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545 return self._interpolate(section, option, value, d) |
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546 |
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547 def items(self, section, raw=False, vars=None): |
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548 """Return a list of tuples with (name, value) for each option |
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549 in the section. |
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550 |
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551 All % interpolations are expanded in the return values, based on the |
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552 defaults passed into the constructor, unless the optional argument |
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553 `raw' is true. Additional substitutions may be provided using the |
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554 `vars' argument, which must be a dictionary whose contents overrides |
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555 any pre-existing defaults. |
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556 |
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557 The section DEFAULT is special. |
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558 """ |
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559 d = self._defaults.copy() |
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560 try: |
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561 d.update(self._sections[section]) |
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562 except KeyError: |
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563 if section != DEFAULTSECT: |
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564 raise NoSectionError(section) |
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565 # Update with the entry specific variables |
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566 if vars: |
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567 for key, value in vars.items(): |
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568 d[self.optionxform(key)] = value |
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569 options = d.keys() |
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570 if "__name__" in options: |
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571 options.remove("__name__") |
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572 if raw: |
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573 return [(option, d[option]) |
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574 for option in options] |
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575 else: |
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576 return [(option, self._interpolate(section, option, d[option], d)) |
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577 for option in options] |
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578 |
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579 def _interpolate(self, section, option, rawval, vars): |
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580 # do the string interpolation |
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581 value = rawval |
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582 depth = MAX_INTERPOLATION_DEPTH |
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583 while depth: # Loop through this until it's done |
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584 depth -= 1 |
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585 if "%(" in value: |
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586 value = self._KEYCRE.sub(self._interpolation_replace, value) |
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587 try: |
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588 value = value % vars |
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589 except KeyError, e: |
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590 raise InterpolationMissingOptionError( |
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591 option, section, rawval, e.args[0]) |
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592 else: |
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593 break |
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594 if "%(" in value: |
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595 raise InterpolationDepthError(option, section, rawval) |
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596 return value |
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597 |
|
598 _KEYCRE = re.compile(r"%\(([^)]*)\)s|.") |
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599 |
|
600 def _interpolation_replace(self, match): |
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601 s = match.group(1) |
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602 if s is None: |
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603 return match.group() |
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604 else: |
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605 return "%%(%s)s" % self.optionxform(s) |
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606 |
|
607 |
|
608 class SafeConfigParser(ConfigParser): |
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609 |
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610 def _interpolate(self, section, option, rawval, vars): |
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611 # do the string interpolation |
|
612 L = [] |
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613 self._interpolate_some(option, L, rawval, section, vars, 1) |
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614 return ''.join(L) |
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615 |
|
616 _interpvar_re = re.compile(r"%\(([^)]+)\)s") |
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617 _badpercent_re = re.compile(r"%[^%]|%$") |
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618 |
|
619 def _interpolate_some(self, option, accum, rest, section, map, depth): |
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620 if depth > MAX_INTERPOLATION_DEPTH: |
|
621 raise InterpolationDepthError(option, section, rest) |
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622 while rest: |
|
623 p = rest.find("%") |
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624 if p < 0: |
|
625 accum.append(rest) |
|
626 return |
|
627 if p > 0: |
|
628 accum.append(rest[:p]) |
|
629 rest = rest[p:] |
|
630 # p is no longer used |
|
631 c = rest[1:2] |
|
632 if c == "%": |
|
633 accum.append("%") |
|
634 rest = rest[2:] |
|
635 elif c == "(": |
|
636 m = self._interpvar_re.match(rest) |
|
637 if m is None: |
|
638 raise InterpolationSyntaxError(option, section, |
|
639 "bad interpolation variable reference %r" % rest) |
|
640 var = self.optionxform(m.group(1)) |
|
641 rest = rest[m.end():] |
|
642 try: |
|
643 v = map[var] |
|
644 except KeyError: |
|
645 raise InterpolationMissingOptionError( |
|
646 option, section, rest, var) |
|
647 if "%" in v: |
|
648 self._interpolate_some(option, accum, v, |
|
649 section, map, depth + 1) |
|
650 else: |
|
651 accum.append(v) |
|
652 else: |
|
653 raise InterpolationSyntaxError( |
|
654 option, section, |
|
655 "'%%' must be followed by '%%' or '(', found: %r" % (rest,)) |
|
656 |
|
657 def set(self, section, option, value): |
|
658 """Set an option. Extend ConfigParser.set: check for string values.""" |
|
659 if not isinstance(value, basestring): |
|
660 raise TypeError("option values must be strings") |
|
661 # check for bad percent signs: |
|
662 # first, replace all "good" interpolations |
|
663 tmp_value = self._interpvar_re.sub('', value) |
|
664 # then, check if there's a lone percent sign left |
|
665 m = self._badpercent_re.search(tmp_value) |
|
666 if m: |
|
667 raise ValueError("invalid interpolation syntax in %r at " |
|
668 "position %d" % (value, m.start())) |
|
669 ConfigParser.set(self, section, option, value) |