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annotate venv/lib/python2.7/site-packages/docutils/parsers/rst/roles.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 # $Id: roles.py 7514 2012-09-14 14:27:12Z milde $
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2 # Author: Edward Loper <edloper@gradient.cis.upenn.edu>
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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 module defines standard interpreted text role functions, a registry for
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7 interpreted text roles, and an API for adding to and retrieving from the
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8 registry.
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9
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10 The interface for interpreted role functions is as follows::
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11
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12 def role_fn(name, rawtext, text, lineno, inliner,
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13 options={}, content=[]):
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14 code...
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15
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16 # Set function attributes for customization:
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17 role_fn.options = ...
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18 role_fn.content = ...
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19
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20 Parameters:
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21
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22 - ``name`` is the local name of the interpreted text role, the role name
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23 actually used in the document.
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24
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25 - ``rawtext`` is a string containing the entire interpreted text construct.
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26 Return it as a ``problematic`` node linked to a system message if there is a
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27 problem.
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28
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29 - ``text`` is the interpreted text content, with backslash escapes converted
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30 to nulls (``\x00``).
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31
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32 - ``lineno`` is the line number where the interpreted text beings.
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33
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34 - ``inliner`` is the Inliner object that called the role function.
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35 It defines the following useful attributes: ``reporter``,
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36 ``problematic``, ``memo``, ``parent``, ``document``.
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37
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38 - ``options``: A dictionary of directive options for customization, to be
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39 interpreted by the role function. Used for additional attributes for the
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40 generated elements and other functionality.
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41
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42 - ``content``: A list of strings, the directive content for customization
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43 ("role" directive). To be interpreted by the role function.
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44
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45 Function attributes for customization, interpreted by the "role" directive:
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46
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47 - ``options``: A dictionary, mapping known option names to conversion
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48 functions such as `int` or `float`. ``None`` or an empty dict implies no
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49 options to parse. Several directive option conversion functions are defined
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50 in the `directives` module.
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51
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52 All role functions implicitly support the "class" option, unless disabled
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53 with an explicit ``{'class': None}``.
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54
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55 - ``content``: A boolean; true if content is allowed. Client code must handle
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56 the case where content is required but not supplied (an empty content list
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57 will be supplied).
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58
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59 Note that unlike directives, the "arguments" function attribute is not
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60 supported for role customization. Directive arguments are handled by the
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61 "role" directive itself.
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62
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63 Interpreted role functions return a tuple of two values:
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64
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65 - A list of nodes which will be inserted into the document tree at the
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66 point where the interpreted role was encountered (can be an empty
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67 list).
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68
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69 - A list of system messages, which will be inserted into the document tree
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70 immediately after the end of the current inline block (can also be empty).
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71 """
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72
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73 __docformat__ = 'reStructuredText'
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74
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75 from docutils import nodes, utils
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76 from docutils.parsers.rst import directives
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77 from docutils.parsers.rst.languages import en as _fallback_language_module
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78 from docutils.utils.code_analyzer import Lexer, LexerError
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79
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80 DEFAULT_INTERPRETED_ROLE = 'title-reference'
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81 """
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82 The canonical name of the default interpreted role. This role is used
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83 when no role is specified for a piece of interpreted text.
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84 """
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85
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86 _role_registry = {}
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87 """Mapping of canonical role names to role functions. Language-dependent role
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88 names are defined in the ``language`` subpackage."""
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89
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90 _roles = {}
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91 """Mapping of local or language-dependent interpreted text role names to role
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92 functions."""
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93
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94 def role(role_name, language_module, lineno, reporter):
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95 """
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96 Locate and return a role function from its language-dependent name, along
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97 with a list of system messages. If the role is not found in the current
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98 language, check English. Return a 2-tuple: role function (``None`` if the
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99 named role cannot be found) and a list of system messages.
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100 """
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101 normname = role_name.lower()
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102 messages = []
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103 msg_text = []
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104
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105 if normname in _roles:
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106 return _roles[normname], messages
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107
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108 if role_name:
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109 canonicalname = None
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110 try:
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111 canonicalname = language_module.roles[normname]
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112 except AttributeError, error:
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113 msg_text.append('Problem retrieving role entry from language '
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114 'module %r: %s.' % (language_module, error))
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115 except KeyError:
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116 msg_text.append('No role entry for "%s" in module "%s".'
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117 % (role_name, language_module.__name__))
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118 else:
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119 canonicalname = DEFAULT_INTERPRETED_ROLE
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120
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121 # If we didn't find it, try English as a fallback.
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122 if not canonicalname:
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123 try:
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124 canonicalname = _fallback_language_module.roles[normname]
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125 msg_text.append('Using English fallback for role "%s".'
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126 % role_name)
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127 except KeyError:
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128 msg_text.append('Trying "%s" as canonical role name.'
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129 % role_name)
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130 # The canonical name should be an English name, but just in case:
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131 canonicalname = normname
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132
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133 # Collect any messages that we generated.
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134 if msg_text:
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135 message = reporter.info('\n'.join(msg_text), line=lineno)
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136 messages.append(message)
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137
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138 # Look the role up in the registry, and return it.
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139 if canonicalname in _role_registry:
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140 role_fn = _role_registry[canonicalname]
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141 register_local_role(normname, role_fn)
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142 return role_fn, messages
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143 else:
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144 return None, messages # Error message will be generated by caller.
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145
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146 def register_canonical_role(name, role_fn):
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147 """
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148 Register an interpreted text role by its canonical name.
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149
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150 :Parameters:
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151 - `name`: The canonical name of the interpreted role.
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152 - `role_fn`: The role function. See the module docstring.
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153 """
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154 set_implicit_options(role_fn)
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155 _role_registry[name] = role_fn
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156
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157 def register_local_role(name, role_fn):
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158 """
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159 Register an interpreted text role by its local or language-dependent name.
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160
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161 :Parameters:
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162 - `name`: The local or language-dependent name of the interpreted role.
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163 - `role_fn`: The role function. See the module docstring.
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164 """
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165 set_implicit_options(role_fn)
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166 _roles[name] = role_fn
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167
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168 def set_implicit_options(role_fn):
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169 """
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170 Add customization options to role functions, unless explicitly set or
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171 disabled.
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172 """
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173 if not hasattr(role_fn, 'options') or role_fn.options is None:
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174 role_fn.options = {'class': directives.class_option}
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175 elif 'class' not in role_fn.options:
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176 role_fn.options['class'] = directives.class_option
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177
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178 def register_generic_role(canonical_name, node_class):
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179 """For roles which simply wrap a given `node_class` around the text."""
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180 role = GenericRole(canonical_name, node_class)
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181 register_canonical_role(canonical_name, role)
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182
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183
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184 class GenericRole:
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185
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186 """
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187 Generic interpreted text role, where the interpreted text is simply
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188 wrapped with the provided node class.
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189 """
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190
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191 def __init__(self, role_name, node_class):
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192 self.name = role_name
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193 self.node_class = node_class
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194
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195 def __call__(self, role, rawtext, text, lineno, inliner,
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196 options={}, content=[]):
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197 set_classes(options)
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198 return [self.node_class(rawtext, utils.unescape(text), **options)], []
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199
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200
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201 class CustomRole:
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202
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203 """
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204 Wrapper for custom interpreted text roles.
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205 """
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206
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207 def __init__(self, role_name, base_role, options={}, content=[]):
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208 self.name = role_name
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209 self.base_role = base_role
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210 self.options = None
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211 if hasattr(base_role, 'options'):
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212 self.options = base_role.options
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213 self.content = None
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214 if hasattr(base_role, 'content'):
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215 self.content = base_role.content
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216 self.supplied_options = options
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217 self.supplied_content = content
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218
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219 def __call__(self, role, rawtext, text, lineno, inliner,
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220 options={}, content=[]):
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221 opts = self.supplied_options.copy()
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222 opts.update(options)
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223 cont = list(self.supplied_content)
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224 if cont and content:
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225 cont += '\n'
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226 cont.extend(content)
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227 return self.base_role(role, rawtext, text, lineno, inliner,
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228 options=opts, content=cont)
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229
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230
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231 def generic_custom_role(role, rawtext, text, lineno, inliner,
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232 options={}, content=[]):
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233 """"""
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234 # Once nested inline markup is implemented, this and other methods should
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235 # recursively call inliner.nested_parse().
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236 set_classes(options)
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237 return [nodes.inline(rawtext, utils.unescape(text), **options)], []
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238
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239 generic_custom_role.options = {'class': directives.class_option}
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240
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241
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242 ######################################################################
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243 # Define and register the standard roles:
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244 ######################################################################
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245
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246 register_generic_role('abbreviation', nodes.abbreviation)
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247 register_generic_role('acronym', nodes.acronym)
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248 register_generic_role('emphasis', nodes.emphasis)
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249 register_generic_role('literal', nodes.literal)
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250 register_generic_role('strong', nodes.strong)
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251 register_generic_role('subscript', nodes.subscript)
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252 register_generic_role('superscript', nodes.superscript)
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253 register_generic_role('title-reference', nodes.title_reference)
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254
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255 def pep_reference_role(role, rawtext, text, lineno, inliner,
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256 options={}, content=[]):
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257 try:
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258 pepnum = int(text)
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259 if pepnum < 0 or pepnum > 9999:
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260 raise ValueError
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261 except ValueError:
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262 msg = inliner.reporter.error(
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263 'PEP number must be a number from 0 to 9999; "%s" is invalid.'
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264 % text, line=lineno)
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265 prb = inliner.problematic(rawtext, rawtext, msg)
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266 return [prb], [msg]
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267 # Base URL mainly used by inliner.pep_reference; so this is correct:
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268 ref = (inliner.document.settings.pep_base_url
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269 + inliner.document.settings.pep_file_url_template % pepnum)
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270 set_classes(options)
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271 return [nodes.reference(rawtext, 'PEP ' + utils.unescape(text), refuri=ref,
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272 **options)], []
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273
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274 register_canonical_role('pep-reference', pep_reference_role)
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275
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276 def rfc_reference_role(role, rawtext, text, lineno, inliner,
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277 options={}, content=[]):
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278 try:
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279 rfcnum = int(text)
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280 if rfcnum <= 0:
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281 raise ValueError
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282 except ValueError:
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283 msg = inliner.reporter.error(
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284 'RFC number must be a number greater than or equal to 1; '
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285 '"%s" is invalid.' % text, line=lineno)
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286 prb = inliner.problematic(rawtext, rawtext, msg)
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287 return [prb], [msg]
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288 # Base URL mainly used by inliner.rfc_reference, so this is correct:
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289 ref = inliner.document.settings.rfc_base_url + inliner.rfc_url % rfcnum
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290 set_classes(options)
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291 node = nodes.reference(rawtext, 'RFC ' + utils.unescape(text), refuri=ref,
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292 **options)
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293 return [node], []
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294
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295 register_canonical_role('rfc-reference', rfc_reference_role)
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296
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297 def raw_role(role, rawtext, text, lineno, inliner, options={}, content=[]):
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298 if not inliner.document.settings.raw_enabled:
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299 msg = inliner.reporter.warning('raw (and derived) roles disabled')
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300 prb = inliner.problematic(rawtext, rawtext, msg)
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301 return [prb], [msg]
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302 if 'format' not in options:
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303 msg = inliner.reporter.error(
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304 'No format (Writer name) is associated with this role: "%s".\n'
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305 'The "raw" role cannot be used directly.\n'
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306 'Instead, use the "role" directive to create a new role with '
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307 'an associated format.' % role, line=lineno)
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308 prb = inliner.problematic(rawtext, rawtext, msg)
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309 return [prb], [msg]
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310 set_classes(options)
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311 node = nodes.raw(rawtext, utils.unescape(text, 1), **options)
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312 node.source, node.line = inliner.reporter.get_source_and_line(lineno)
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313 return [node], []
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314
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315 raw_role.options = {'format': directives.unchanged}
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316
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317 register_canonical_role('raw', raw_role)
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318
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319 def code_role(role, rawtext, text, lineno, inliner, options={}, content=[]):
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320 set_classes(options)
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321 language = options.get('language', '')
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322 classes = ['code']
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323 if 'classes' in options:
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324 classes.extend(options['classes'])
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325 if language and language not in classes:
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326 classes.append(language)
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327 try:
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328 tokens = Lexer(utils.unescape(text, 1), language,
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329 inliner.document.settings.syntax_highlight)
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330 except LexerError, error:
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331 msg = inliner.reporter.warning(error)
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332 prb = inliner.problematic(rawtext, rawtext, msg)
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333 return [prb], [msg]
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parents:
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334
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335 node = nodes.literal(rawtext, '', classes=classes)
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336
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337 # analyze content and add nodes for every token
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338 for classes, value in tokens:
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339 # print (classes, value)
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340 if classes:
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341 node += nodes.inline(value, value, classes=classes)
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342 else:
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343 # insert as Text to decrease the verbosity of the output
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344 node += nodes.Text(value, value)
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345
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346 return [node], []
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347
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348 code_role.options = {'class': directives.class_option,
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349 'language': directives.unchanged}
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350
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351 register_canonical_role('code', code_role)
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352
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353 def math_role(role, rawtext, text, lineno, inliner, options={}, content=[]):
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354 i = rawtext.find('`')
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355 text = rawtext.split('`')[1]
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356 node = nodes.math(rawtext, text)
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357 return [node], []
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358
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359 register_canonical_role('math', math_role)
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360
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361 ######################################################################
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362 # Register roles that are currently unimplemented.
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363 ######################################################################
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364
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365 def unimplemented_role(role, rawtext, text, lineno, inliner, attributes={}):
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366 msg = inliner.reporter.error(
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367 'Interpreted text role "%s" not implemented.' % role, line=lineno)
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368 prb = inliner.problematic(rawtext, rawtext, msg)
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parents:
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369 return [prb], [msg]
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370
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371 register_canonical_role('index', unimplemented_role)
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372 register_canonical_role('named-reference', unimplemented_role)
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373 register_canonical_role('anonymous-reference', unimplemented_role)
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374 register_canonical_role('uri-reference', unimplemented_role)
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375 register_canonical_role('footnote-reference', unimplemented_role)
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376 register_canonical_role('citation-reference', unimplemented_role)
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377 register_canonical_role('substitution-reference', unimplemented_role)
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378 register_canonical_role('target', unimplemented_role)
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379
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380 # This should remain unimplemented, for testing purposes:
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381 register_canonical_role('restructuredtext-unimplemented-role',
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382 unimplemented_role)
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383
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384
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385 def set_classes(options):
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386 """
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387 Auxiliary function to set options['classes'] and delete
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388 options['class'].
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389 """
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390 if 'class' in options:
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391 assert 'classes' not in options
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392 options['classes'] = options['class']
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393 del options['class']