Mercurial > kallithea

annotate rhodecode/lib/markup_renderer.py @ 4147:1c8f818787b3 rhodecode-2.2.5-gpl

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author Mads Kiilerich <madski@unity3d.com>
date Wed, 02 Jul 2014 19:03:23 -0400
parents ffd45b185016
children 7e5f8c12a3fc
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1 # -*- coding: utf-8 -*-
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2 # This program is free software: you can redistribute it and/or modify
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3 # it under the terms of the GNU General Public License as published by
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4 # the Free Software Foundation, either version 3 of the License, or
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5 # (at your option) any later version.
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6 #
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7 # This program is distributed in the hope that it will be useful,
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8 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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9 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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10 # GNU General Public License for more details.
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11 #
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12 # You should have received a copy of the GNU General Public License
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13 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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14 """
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15 rhodecode.lib.markup_renderer
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16 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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17
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18 Renderer for markup languages with ability to parse using rst or markdown
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19
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20 :created_on: Oct 27, 2011
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21 :author: marcink
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22 :copyright: (c) 2013 RhodeCode GmbH.
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23 :license: GPLv3, see LICENSE for more details.
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24 """
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25
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26
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27 import re
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28 import logging
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29 import traceback
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30
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31 from rhodecode.lib.utils2 import safe_unicode, MENTIONS_REGEX
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32
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33 log = logging.getLogger(__name__)
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34
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35
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36 class MarkupRenderer(object):
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37 RESTRUCTUREDTEXT_DISALLOWED_DIRECTIVES = ['include', 'meta', 'raw']
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38
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39 MARKDOWN_PAT = re.compile(r'md|mkdn?|mdown|markdown', re.IGNORECASE)
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40 RST_PAT = re.compile(r're?st', re.IGNORECASE)
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41 PLAIN_PAT = re.compile(r'readme', re.IGNORECASE)
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42
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43 def _detect_renderer(self, source, filename=None):
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44 """
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45 runs detection of what renderer should be used for generating html
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46 from a markup language
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47
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48 filename can be also explicitly a renderer name
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49
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50 :param source:
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51 :param filename:
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52 """
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53
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54 if MarkupRenderer.MARKDOWN_PAT.findall(filename):
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55 detected_renderer = 'markdown'
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56 elif MarkupRenderer.RST_PAT.findall(filename):
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57 detected_renderer = 'rst'
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58 elif MarkupRenderer.PLAIN_PAT.findall(filename):
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59 detected_renderer = 'rst'
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60 else:
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61 detected_renderer = 'plain'
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62
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63 return getattr(MarkupRenderer, detected_renderer)
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64
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65 @classmethod
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66 def _flavored_markdown(cls, text):
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67 """
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68 Github style flavored markdown
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69
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70 :param text:
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71 """
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72 from hashlib import md5
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73
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74 # Extract pre blocks.
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75 extractions = {}
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76 def pre_extraction_callback(matchobj):
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77 digest = md5(matchobj.group(0)).hexdigest()
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78 extractions[digest] = matchobj.group(0)
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79 return "{gfm-extraction-%s}" % digest
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80 pattern = re.compile(r'<pre>.*?</pre>', re.MULTILINE | re.DOTALL)
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81 text = re.sub(pattern, pre_extraction_callback, text)
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82
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83 # Prevent foo_bar_baz from ending up with an italic word in the middle.
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84 def italic_callback(matchobj):
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85 s = matchobj.group(0)
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86 if list(s).count('_') >= 2:
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87 return s.replace('_', '\_')
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88 return s
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89 text = re.sub(r'^(?! {4}|\t)\w+_\w+_\w[\w_]*', italic_callback, text)
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90
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91 # In very clear cases, let newlines become <br /> tags.
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92 def newline_callback(matchobj):
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93 if len(matchobj.group(1)) == 1:
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94 return matchobj.group(0).rstrip() + ' \n'
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95 else:
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96 return matchobj.group(0)
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97 pattern = re.compile(r'^[\w\<][^\n]*(\n+)', re.MULTILINE)
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98 text = re.sub(pattern, newline_callback, text)
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99
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100 # Insert pre block extractions.
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101 def pre_insert_callback(matchobj):
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102 return '\n\n' + extractions[matchobj.group(1)]
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103 text = re.sub(r'{gfm-extraction-([0-9a-f]{32})\}',
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104 pre_insert_callback, text)
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105
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106 return text
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107
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108 def render(self, source, filename=None):
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109 """
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110 Renders a given filename using detected renderer
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111 it detects renderers based on file extension or mimetype.
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112 At last it will just do a simple html replacing new lines with <br/>
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113
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114 :param file_name:
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115 :param source:
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116 """
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117
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118 renderer = self._detect_renderer(source, filename)
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119 readme_data = renderer(source)
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120 return readme_data
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121
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122 @classmethod
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123 def plain(cls, source, universal_newline=True):
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124 source = safe_unicode(source)
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125 if universal_newline:
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126 newline = '\n'
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127 source = newline.join(source.splitlines())
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128 def urlify_text(text):
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129 url_pat = re.compile(r'(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]'
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130 '|[!*\(\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+)')
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131
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132 def url_func(match_obj):
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133 url_full = match_obj.groups()[0]
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134 return '<a href="%(url)s">%(url)s</a>' % ({'url': url_full})
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135
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136 return url_pat.sub(url_func, text)
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137
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138 source = urlify_text(source)
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139 return '<br />' + source.replace("\n", '<br />')
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140
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141 @classmethod
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142 def markdown(cls, source, safe=True, flavored=False):
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143 source = safe_unicode(source)
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144 try:
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145 import markdown as __markdown
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146 if flavored:
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147 source = cls._flavored_markdown(source)
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148 return __markdown.markdown(source, ['codehilite', 'extra'])
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149 except ImportError:
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150 log.warning('Install markdown to use this function')
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151 return cls.plain(source)
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152 except Exception:
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153 log.error(traceback.format_exc())
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154 if safe:
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155 log.debug('Fallbacking to render in plain mode')
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156 return cls.plain(source)
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157 else:
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158 raise
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159
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160 @classmethod
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161 def rst(cls, source, safe=True):
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162 source = safe_unicode(source)
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163 try:
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164 from docutils.core import publish_parts
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165 from docutils.parsers.rst import directives
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166 docutils_settings = dict([(alias, None) for alias in
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167 cls.RESTRUCTUREDTEXT_DISALLOWED_DIRECTIVES])
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168
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169 docutils_settings.update({'input_encoding': 'unicode',
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170 'report_level': 4})
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171
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172 for k, v in docutils_settings.iteritems():
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173 directives.register_directive(k, v)
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174
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175 parts = publish_parts(source=source,
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176 writer_name="html4css1",
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177 settings_overrides=docutils_settings)
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178
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179 return parts['html_title'] + parts["fragment"]
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180 except ImportError:
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181 log.warning('Install docutils to use this function')
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182 return cls.plain(source)
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183 except Exception:
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184 log.error(traceback.format_exc())
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185 if safe:
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186 log.debug('Fallbacking to render in plain mode')
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187 return cls.plain(source)
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188 else:
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189 raise
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190
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191 @classmethod
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192 def rst_with_mentions(cls, source):
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193 mention_pat = re.compile(MENTIONS_REGEX)
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194
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195 def wrapp(match_obj):
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196 uname = match_obj.groups()[0]
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197 return ' **@%(uname)s** ' % {'uname': uname}
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198 mention_hl = mention_pat.sub(wrapp, source).strip()
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199 return cls.rst(mention_hl)