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author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 # $Id: __init__.py 7756 2014-07-06 11:48:05Z grubert $
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2 # Author: David Goodger <goodger@python.org>
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3 # Copyright: This module has been placed in the public domain.
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4
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5 """
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6 This is the Docutils (Python Documentation Utilities) package.
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7
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8 Package Structure
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9 =================
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10
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11 Modules:
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12
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13 - __init__.py: Contains component base classes, exception classes, and
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14 Docutils version information.
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15
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16 - core.py: Contains the ``Publisher`` class and ``publish_*()`` convenience
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17 functions.
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18
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19 - frontend.py: Runtime settings (command-line interface, configuration files)
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20 processing, for Docutils front-ends.
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21
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22 - io.py: Provides a uniform API for low-level input and output.
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23
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24 - nodes.py: Docutils document tree (doctree) node class library.
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25
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26 - statemachine.py: A finite state machine specialized for
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27 regular-expression-based text filters.
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28
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29 Subpackages:
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30
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31 - languages: Language-specific mappings of terms.
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32
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33 - parsers: Syntax-specific input parser modules or packages.
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34
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35 - readers: Context-specific input handlers which understand the data
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36 source and manage a parser.
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37
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38 - transforms: Modules used by readers and writers to modify DPS
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39 doctrees.
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40
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41 - utils: Contains the ``Reporter`` system warning class and miscellaneous
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42 utilities used by readers, writers, and transforms.
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43
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44 utils/urischemes.py: Contains a complete mapping of known URI addressing
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45 scheme names to descriptions.
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46
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47 - utils/math: Contains functions for conversion of mathematical notation
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48 between different formats (LaTeX, MathML, text, ...).
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49
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50 - writers: Format-specific output translators.
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51 """
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52
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53 __docformat__ = 'reStructuredText'
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54
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55 __version__ = '0.12'
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56 """``major.minor.micro`` version number. The micro number is bumped for API
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57 changes, for new functionality, and for interim project releases. The minor
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58 number is bumped whenever there is a significant project release. The major
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59 number will be bumped when the project is feature-complete, and perhaps if
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60 there is a major change in the design."""
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61
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62 __version_details__ = 'release'
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63 """Extra version details (e.g. 'snapshot 2005-05-29, r3410', 'repository',
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64 'release'), modified automatically & manually."""
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65
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66 import sys
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67
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68 class ApplicationError(StandardError):
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69 # Workaround:
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70 # In Python < 2.6, unicode(<exception instance>) calls `str` on the
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71 # arg and therefore, e.g., unicode(StandardError(u'\u234')) fails
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72 # with UnicodeDecodeError.
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73 if sys.version_info < (2,6):
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74 def __unicode__(self):
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75 return u', '.join(self.args)
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76
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77 class DataError(ApplicationError): pass
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78
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79
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80 class SettingsSpec:
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81
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82 """
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83 Runtime setting specification base class.
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84
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85 SettingsSpec subclass objects used by `docutils.frontend.OptionParser`.
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86 """
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87
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88 settings_spec = ()
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89 """Runtime settings specification. Override in subclasses.
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90
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91 Defines runtime settings and associated command-line options, as used by
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92 `docutils.frontend.OptionParser`. This is a tuple of:
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93
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94 - Option group title (string or `None` which implies no group, just a list
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95 of single options).
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96
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97 - Description (string or `None`).
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98
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99 - A sequence of option tuples. Each consists of:
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100
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101 - Help text (string)
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102
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103 - List of option strings (e.g. ``['-Q', '--quux']``).
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104
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105 - Dictionary of keyword arguments sent to the OptionParser/OptionGroup
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106 ``add_option`` method.
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107
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108 Runtime setting names are derived implicitly from long option names
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109 ('--a-setting' becomes ``settings.a_setting``) or explicitly from the
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110 'dest' keyword argument.
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111
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112 Most settings will also have a 'validator' keyword & function. The
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113 validator function validates setting values (from configuration files
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114 and command-line option arguments) and converts them to appropriate
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115 types. For example, the ``docutils.frontend.validate_boolean``
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116 function, **required by all boolean settings**, converts true values
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117 ('1', 'on', 'yes', and 'true') to 1 and false values ('0', 'off',
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118 'no', 'false', and '') to 0. Validators need only be set once per
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119 setting. See the `docutils.frontend.validate_*` functions.
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120
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121 See the optparse docs for more details.
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122
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123 - More triples of group title, description, options, as many times as
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124 needed. Thus, `settings_spec` tuples can be simply concatenated.
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125 """
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126
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127 settings_defaults = None
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128 """A dictionary of defaults for settings not in `settings_spec` (internal
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129 settings, intended to be inaccessible by command-line and config file).
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130 Override in subclasses."""
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131
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132 settings_default_overrides = None
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133 """A dictionary of auxiliary defaults, to override defaults for settings
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134 defined in other components. Override in subclasses."""
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135
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136 relative_path_settings = ()
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137 """Settings containing filesystem paths. Override in subclasses.
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138 Settings listed here are to be interpreted relative to the current working
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139 directory."""
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140
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141 config_section = None
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142 """The name of the config file section specific to this component
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143 (lowercase, no brackets). Override in subclasses."""
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144
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145 config_section_dependencies = None
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146 """A list of names of config file sections that are to be applied before
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147 `config_section`, in order (from general to specific). In other words,
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148 the settings in `config_section` are to be overlaid on top of the settings
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149 from these sections. The "general" section is assumed implicitly.
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150 Override in subclasses."""
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151
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152
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153 class TransformSpec:
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154
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155 """
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156 Runtime transform specification base class.
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157
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158 TransformSpec subclass objects used by `docutils.transforms.Transformer`.
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159 """
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160
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161 def get_transforms(self):
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162 """Transforms required by this class. Override in subclasses."""
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163 if self.default_transforms != ():
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164 import warnings
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165 warnings.warn('default_transforms attribute deprecated.\n'
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166 'Use get_transforms() method instead.',
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167 DeprecationWarning)
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168 return list(self.default_transforms)
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169 return []
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170
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171 # Deprecated; for compatibility.
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172 default_transforms = ()
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173
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174 unknown_reference_resolvers = ()
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175 """List of functions to try to resolve unknown references. Unknown
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176 references have a 'refname' attribute which doesn't correspond to any
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177 target in the document. Called when the transforms in
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178 `docutils.tranforms.references` are unable to find a correct target. The
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179 list should contain functions which will try to resolve unknown
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180 references, with the following signature::
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181
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182 def reference_resolver(node):
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183 '''Returns boolean: true if resolved, false if not.'''
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184
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185 If the function is able to resolve the reference, it should also remove
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186 the 'refname' attribute and mark the node as resolved::
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187
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188 del node['refname']
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189 node.resolved = 1
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190
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191 Each function must have a "priority" attribute which will affect the order
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192 the unknown_reference_resolvers are run::
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193
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194 reference_resolver.priority = 100
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195
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196 Override in subclasses."""
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197
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198
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199 class Component(SettingsSpec, TransformSpec):
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200
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201 """Base class for Docutils components."""
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202
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203 component_type = None
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204 """Name of the component type ('reader', 'parser', 'writer'). Override in
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205 subclasses."""
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206
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207 supported = ()
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208 """Names for this component. Override in subclasses."""
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209
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210 def supports(self, format):
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211 """
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212 Is `format` supported by this component?
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213
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214 To be used by transforms to ask the dependent component if it supports
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215 a certain input context or output format.
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216 """
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217 return format in self.supported