Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/docutils/parsers/rst/__init__.py @ 0:4f3585e2f14b draft default tip
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author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 # $Id: __init__.py 8344 2019-08-26 12:10:43Z milde $ |
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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 ``docutils.parsers.rst`` package. It exports a single class, `Parser`, |
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7 the reStructuredText parser. |
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8 |
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9 |
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10 Usage |
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11 ===== |
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12 |
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13 1. Create a parser:: |
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14 |
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15 parser = docutils.parsers.rst.Parser() |
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16 |
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17 Several optional arguments may be passed to modify the parser's behavior. |
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18 Please see `Customizing the Parser`_ below for details. |
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19 |
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20 2. Gather input (a multi-line string), by reading a file or the standard |
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21 input:: |
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22 |
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23 input = sys.stdin.read() |
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24 |
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25 3. Create a new empty `docutils.nodes.document` tree:: |
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26 |
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27 document = docutils.utils.new_document(source, settings) |
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28 |
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29 See `docutils.utils.new_document()` for parameter details. |
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30 |
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31 4. Run the parser, populating the document tree:: |
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32 |
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33 parser.parse(input, document) |
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34 |
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35 |
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36 Parser Overview |
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37 =============== |
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38 |
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39 The reStructuredText parser is implemented as a state machine, examining its |
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40 input one line at a time. To understand how the parser works, please first |
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41 become familiar with the `docutils.statemachine` module, then see the |
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42 `states` module. |
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43 |
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44 |
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45 Customizing the Parser |
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46 ---------------------- |
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47 |
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48 Anything that isn't already customizable is that way simply because that type |
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49 of customizability hasn't been implemented yet. Patches welcome! |
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50 |
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51 When instantiating an object of the `Parser` class, two parameters may be |
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52 passed: ``rfc2822`` and ``inliner``. Pass ``rfc2822=True`` to enable an |
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53 initial RFC-2822 style header block, parsed as a "field_list" element (with |
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54 "class" attribute set to "rfc2822"). Currently this is the only body-level |
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55 element which is customizable without subclassing. (Tip: subclass `Parser` |
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56 and change its "state_classes" and "initial_state" attributes to refer to new |
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57 classes. Contact the author if you need more details.) |
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58 |
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59 The ``inliner`` parameter takes an instance of `states.Inliner` or a subclass. |
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60 It handles inline markup recognition. A common extension is the addition of |
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61 further implicit hyperlinks, like "RFC 2822". This can be done by subclassing |
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62 `states.Inliner`, adding a new method for the implicit markup, and adding a |
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63 ``(pattern, method)`` pair to the "implicit_dispatch" attribute of the |
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64 subclass. See `states.Inliner.implicit_inline()` for details. Explicit |
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65 inline markup can be customized in a `states.Inliner` subclass via the |
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66 ``patterns.initial`` and ``dispatch`` attributes (and new methods as |
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67 appropriate). |
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68 """ |
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69 |
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70 __docformat__ = 'reStructuredText' |
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71 |
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72 |
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73 import docutils.parsers |
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74 import docutils.statemachine |
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75 from docutils.parsers.rst import roles, states |
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76 from docutils import frontend, nodes, Component |
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77 from docutils.transforms import universal |
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78 |
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79 |
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80 class Parser(docutils.parsers.Parser): |
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81 |
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82 """The reStructuredText parser.""" |
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83 |
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84 supported = ('restructuredtext', 'rst', 'rest', 'restx', 'rtxt', 'rstx') |
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85 """Aliases this parser supports.""" |
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86 |
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87 settings_spec = ( |
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88 'reStructuredText Parser Options', |
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89 None, |
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90 (('Recognize and link to standalone PEP references (like "PEP 258").', |
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91 ['--pep-references'], |
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92 {'action': 'store_true', 'validator': frontend.validate_boolean}), |
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93 ('Base URL for PEP references ' |
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94 '(default "http://www.python.org/dev/peps/").', |
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95 ['--pep-base-url'], |
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96 {'metavar': '<URL>', 'default': 'http://www.python.org/dev/peps/', |
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97 'validator': frontend.validate_url_trailing_slash}), |
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98 ('Template for PEP file part of URL. (default "pep-%04d")', |
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99 ['--pep-file-url-template'], |
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100 {'metavar': '<URL>', 'default': 'pep-%04d'}), |
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101 ('Recognize and link to standalone RFC references (like "RFC 822").', |
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102 ['--rfc-references'], |
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103 {'action': 'store_true', 'validator': frontend.validate_boolean}), |
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104 ('Base URL for RFC references (default "http://tools.ietf.org/html/").', |
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105 ['--rfc-base-url'], |
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106 {'metavar': '<URL>', 'default': 'http://tools.ietf.org/html/', |
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107 'validator': frontend.validate_url_trailing_slash}), |
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108 ('Set number of spaces for tab expansion (default 8).', |
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109 ['--tab-width'], |
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110 {'metavar': '<width>', 'type': 'int', 'default': 8, |
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111 'validator': frontend.validate_nonnegative_int}), |
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112 ('Remove spaces before footnote references.', |
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113 ['--trim-footnote-reference-space'], |
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114 {'action': 'store_true', 'validator': frontend.validate_boolean}), |
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115 ('Leave spaces before footnote references.', |
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116 ['--leave-footnote-reference-space'], |
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117 {'action': 'store_false', 'dest': 'trim_footnote_reference_space'}), |
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118 ('Disable directives that insert the contents of external file ' |
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119 '("include" & "raw"); replaced with a "warning" system message.', |
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120 ['--no-file-insertion'], |
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121 {'action': 'store_false', 'default': 1, |
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122 'dest': 'file_insertion_enabled', |
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123 'validator': frontend.validate_boolean}), |
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124 ('Enable directives that insert the contents of external file ' |
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125 '("include" & "raw"). Enabled by default.', |
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126 ['--file-insertion-enabled'], |
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127 {'action': 'store_true'}), |
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128 ('Disable the "raw" directives; replaced with a "warning" ' |
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129 'system message.', |
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130 ['--no-raw'], |
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131 {'action': 'store_false', 'default': 1, 'dest': 'raw_enabled', |
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132 'validator': frontend.validate_boolean}), |
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133 ('Enable the "raw" directive. Enabled by default.', |
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134 ['--raw-enabled'], |
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135 {'action': 'store_true'}), |
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136 ('Token name set for parsing code with Pygments: one of ' |
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137 '"long", "short", or "none (no parsing)". Default is "long".', |
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138 ['--syntax-highlight'], |
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139 {'choices': ['long', 'short', 'none'], |
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140 'default': 'long', 'metavar': '<format>'}), |
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141 ('Change straight quotation marks to typographic form: ' |
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142 'one of "yes", "no", "alt[ernative]" (default "no").', |
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143 ['--smart-quotes'], |
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144 {'default': False, 'metavar': '<yes/no/alt>', |
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145 'validator': frontend.validate_ternary}), |
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146 ('Characters to use as "smart quotes" for <language>. ', |
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147 ['--smartquotes-locales'], |
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148 {'metavar': '<language:quotes[,language:quotes,...]>', |
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149 'action': 'append', |
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150 'validator': frontend.validate_smartquotes_locales}), |
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151 ('Inline markup recognized at word boundaries only ' |
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152 '(adjacent to punctuation or whitespace). ' |
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153 'Force character-level inline markup recognition with ' |
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154 '"\\ " (backslash + space). Default.', |
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155 ['--word-level-inline-markup'], |
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156 {'action': 'store_false', 'dest': 'character_level_inline_markup'}), |
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157 ('Inline markup recognized anywhere, regardless of surrounding ' |
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158 'characters. Backslash-escapes must be used to avoid unwanted ' |
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159 'markup recognition. Useful for East Asian languages. ' |
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160 'Experimental.', |
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161 ['--character-level-inline-markup'], |
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162 {'action': 'store_true', 'default': False, |
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163 'dest': 'character_level_inline_markup'}), |
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164 )) |
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165 |
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166 config_section = 'restructuredtext parser' |
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167 config_section_dependencies = ('parsers',) |
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168 |
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169 def __init__(self, rfc2822=False, inliner=None): |
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170 if rfc2822: |
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171 self.initial_state = 'RFC2822Body' |
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172 else: |
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173 self.initial_state = 'Body' |
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174 self.state_classes = states.state_classes |
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175 self.inliner = inliner |
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176 |
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177 def get_transforms(self): |
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178 return Component.get_transforms(self) + [ |
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179 universal.SmartQuotes] |
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180 |
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181 def parse(self, inputstring, document): |
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182 """Parse `inputstring` and populate `document`, a document tree.""" |
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183 self.setup_parse(inputstring, document) |
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184 self.statemachine = states.RSTStateMachine( |
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185 state_classes=self.state_classes, |
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186 initial_state=self.initial_state, |
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187 debug=document.reporter.debug_flag) |
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188 inputlines = docutils.statemachine.string2lines( |
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189 inputstring, tab_width=document.settings.tab_width, |
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190 convert_whitespace=True) |
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191 self.statemachine.run(inputlines, document, inliner=self.inliner) |
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192 # restore the "default" default role after parsing a document |
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193 if '' in roles._roles: |
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194 del roles._roles[''] |
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195 self.finish_parse() |
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196 |
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197 |
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198 class DirectiveError(Exception): |
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199 |
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200 """ |
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201 Store a message and a system message level. |
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202 |
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203 To be thrown from inside directive code. |
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204 |
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205 Do not instantiate directly -- use `Directive.directive_error()` |
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206 instead! |
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207 """ |
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208 |
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209 def __init__(self, level, message): |
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210 """Set error `message` and `level`""" |
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211 Exception.__init__(self) |
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212 self.level = level |
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213 self.msg = message |
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214 |
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215 |
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216 class Directive(object): |
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217 |
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218 """ |
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219 Base class for reStructuredText directives. |
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220 |
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221 The following attributes may be set by subclasses. They are |
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222 interpreted by the directive parser (which runs the directive |
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223 class): |
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224 |
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225 - `required_arguments`: The number of required arguments (default: |
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226 0). |
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227 |
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228 - `optional_arguments`: The number of optional arguments (default: |
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229 0). |
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230 |
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231 - `final_argument_whitespace`: A boolean, indicating if the final |
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232 argument may contain whitespace (default: False). |
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233 |
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234 - `option_spec`: A dictionary, mapping known option names to |
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235 conversion functions such as `int` or `float` (default: {}, no |
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236 options). Several conversion functions are defined in the |
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237 directives/__init__.py module. |
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238 |
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239 Option conversion functions take a single parameter, the option |
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240 argument (a string or ``None``), validate it and/or convert it |
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241 to the appropriate form. Conversion functions may raise |
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242 `ValueError` and `TypeError` exceptions. |
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243 |
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244 - `has_content`: A boolean; True if content is allowed. Client |
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245 code must handle the case where content is required but not |
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246 supplied (an empty content list will be supplied). |
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247 |
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248 Arguments are normally single whitespace-separated words. The |
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249 final argument may contain whitespace and/or newlines if |
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250 `final_argument_whitespace` is True. |
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251 |
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252 If the form of the arguments is more complex, specify only one |
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253 argument (either required or optional) and set |
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254 `final_argument_whitespace` to True; the client code must do any |
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255 context-sensitive parsing. |
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256 |
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257 When a directive implementation is being run, the directive class |
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258 is instantiated, and the `run()` method is executed. During |
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259 instantiation, the following instance variables are set: |
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260 |
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261 - ``name`` is the directive type or name (string). |
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262 |
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263 - ``arguments`` is the list of positional arguments (strings). |
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264 |
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265 - ``options`` is a dictionary mapping option names (strings) to |
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266 values (type depends on option conversion functions; see |
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267 `option_spec` above). |
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268 |
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269 - ``content`` is a list of strings, the directive content line by line. |
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270 |
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271 - ``lineno`` is the absolute line number of the first line |
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272 of the directive. |
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273 |
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274 - ``content_offset`` is the line offset of the first line of the content from |
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275 the beginning of the current input. Used when initiating a nested parse. |
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276 |
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277 - ``block_text`` is a string containing the entire directive. |
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278 |
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279 - ``state`` is the state which called the directive function. |
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280 |
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281 - ``state_machine`` is the state machine which controls the state which called |
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282 the directive function. |
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283 |
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284 Directive functions return a list of nodes which will be inserted |
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285 into the document tree at the point where the directive was |
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286 encountered. This can be an empty list if there is nothing to |
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287 insert. |
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288 |
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289 For ordinary directives, the list must contain body elements or |
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290 structural elements. Some directives are intended specifically |
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291 for substitution definitions, and must return a list of `Text` |
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292 nodes and/or inline elements (suitable for inline insertion, in |
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293 place of the substitution reference). Such directives must verify |
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294 substitution definition context, typically using code like this:: |
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295 |
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296 if not isinstance(state, states.SubstitutionDef): |
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297 error = state_machine.reporter.error( |
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298 'Invalid context: the "%s" directive can only be used ' |
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299 'within a substitution definition.' % (name), |
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300 nodes.literal_block(block_text, block_text), line=lineno) |
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301 return [error] |
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302 """ |
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303 |
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304 # There is a "Creating reStructuredText Directives" how-to at |
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305 # <http://docutils.sf.net/docs/howto/rst-directives.html>. If you |
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306 # update this docstring, please update the how-to as well. |
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307 |
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308 required_arguments = 0 |
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309 """Number of required directive arguments.""" |
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310 |
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311 optional_arguments = 0 |
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312 """Number of optional arguments after the required arguments.""" |
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313 |
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314 final_argument_whitespace = False |
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315 """May the final argument contain whitespace?""" |
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316 |
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317 option_spec = None |
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318 """Mapping of option names to validator functions.""" |
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319 |
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320 has_content = False |
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321 """May the directive have content?""" |
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322 |
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323 def __init__(self, name, arguments, options, content, lineno, |
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324 content_offset, block_text, state, state_machine): |
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325 self.name = name |
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326 self.arguments = arguments |
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327 self.options = options |
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328 self.content = content |
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329 self.lineno = lineno |
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330 self.content_offset = content_offset |
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331 self.block_text = block_text |
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332 self.state = state |
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333 self.state_machine = state_machine |
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334 |
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335 def run(self): |
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336 raise NotImplementedError('Must override run() is subclass.') |
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337 |
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338 # Directive errors: |
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339 |
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340 def directive_error(self, level, message): |
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341 """ |
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342 Return a DirectiveError suitable for being thrown as an exception. |
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343 |
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344 Call "raise self.directive_error(level, message)" from within |
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345 a directive implementation to return one single system message |
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346 at level `level`, which automatically gets the directive block |
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347 and the line number added. |
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348 |
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349 Preferably use the `debug`, `info`, `warning`, `error`, or `severe` |
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350 wrapper methods, e.g. ``self.error(message)`` to generate an |
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351 ERROR-level directive error. |
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352 """ |
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353 return DirectiveError(level, message) |
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354 |
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355 def debug(self, message): |
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356 return self.directive_error(0, message) |
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357 |
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358 def info(self, message): |
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359 return self.directive_error(1, message) |
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360 |
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361 def warning(self, message): |
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362 return self.directive_error(2, message) |
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363 |
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364 def error(self, message): |
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365 return self.directive_error(3, message) |
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366 |
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367 def severe(self, message): |
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368 return self.directive_error(4, message) |
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369 |
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370 # Convenience methods: |
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371 |
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372 def assert_has_content(self): |
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373 """ |
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374 Throw an ERROR-level DirectiveError if the directive doesn't |
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375 have contents. |
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376 """ |
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377 if not self.content: |
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378 raise self.error('Content block expected for the "%s" directive; ' |
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379 'none found.' % self.name) |
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380 |
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381 def add_name(self, node): |
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382 """Append self.options['name'] to node['names'] if it exists. |
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383 |
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384 Also normalize the name string and register it as explicit target. |
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385 """ |
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386 if 'name' in self.options: |
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387 name = nodes.fully_normalize_name(self.options.pop('name')) |
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388 if 'name' in node: |
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389 del(node['name']) |
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390 node['names'].append(name) |
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391 self.state.document.note_explicit_target(node, node) |
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392 |
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393 |
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394 def convert_directive_function(directive_fn): |
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395 """ |
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396 Define & return a directive class generated from `directive_fn`. |
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397 |
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398 `directive_fn` uses the old-style, functional interface. |
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399 """ |
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400 |
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401 class FunctionalDirective(Directive): |
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402 |
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403 option_spec = getattr(directive_fn, 'options', None) |
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404 has_content = getattr(directive_fn, 'content', False) |
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405 _argument_spec = getattr(directive_fn, 'arguments', (0, 0, False)) |
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406 required_arguments, optional_arguments, final_argument_whitespace \ |
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407 = _argument_spec |
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408 |
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409 def run(self): |
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410 return directive_fn( |
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411 self.name, self.arguments, self.options, self.content, |
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412 self.lineno, self.content_offset, self.block_text, |
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413 self.state, self.state_machine) |
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414 |
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415 # Return new-style directive. |
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416 return FunctionalDirective |