third_party/markdown/extensions/smart_strong.py

   1 # markdown is released under the BSD license
   2 # Copyright 2007, 2008 The Python Markdown Project (v. 1.7 and later)
   3 # Copyright 2004, 2005, 2006 Yuri Takhteyev (v. 0.2-1.6b)
   4 # Copyright 2004 Manfred Stienstra (the original version)
   5 #
   6 # All rights reserved.
   7 #
   8 # Redistribution and use in source and binary forms, with or without
   9 # modification, are permitted provided that the following conditions are met:
  10 #
  11 # *   Redistributions of source code must retain the above copyright
  12 #     notice, this list of conditions and the following disclaimer.
  13 # *   Redistributions in binary form must reproduce the above copyright
  14 #     notice, this list of conditions and the following disclaimer in the
  15 #     documentation and/or other materials provided with the distribution.
  16 # *   Neither the name of the <organization> nor the
  17 #     names of its contributors may be used to endorse or promote products
  18 #     derived from this software without specific prior written permission.
  19 #
  20 # THIS SOFTWARE IS PROVIDED BY THE PYTHON MARKDOWN PROJECT ''AS IS'' AND ANY
  21 # EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  22 # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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  31
  32
  33 '''
  34 Smart_Strong Extension for Python-Markdown
  35 ==========================================
  36
  37 This extention adds smarter handling of double underscores within words.
  38
  39 Simple Usage:
  40
  41     >>> import markdown
  42     >>> print markdown.markdown('Text with double__underscore__words.',
  43     ...                   extensions=['smart_strong'])
  44     <p>Text with double__underscore__words.</p>
  45     >>> print markdown.markdown('__Strong__ still works.',
  46     ...                   extensions=['smart_strong'])
  47     <p><strong>Strong</strong> still works.</p>
  48     >>> print markdown.markdown('__this__works__too__.',
  49     ...                   extensions=['smart_strong'])
  50     <p><strong>this__works__too</strong>.</p>
  51
  52 Copyright 2011
  53 [Waylan Limberg](http://achinghead.com)
  54
  55 '''
  56
  57 from __future__ import absolute_import
  58 from __future__ import unicode_literals
  59 from . import Extension
  60 from ..inlinepatterns import SimpleTagPattern
  61
  62 SMART_STRONG_RE = r'(?<!\w)(_{2})(?!_)(.+?)(?<!_)\2(?!\w)'
  63 STRONG_RE = r'(\*{2})(.+?)\2'
  64
  65 class SmartEmphasisExtension(Extension):
  66     """ Add smart_emphasis extension to Markdown class."""
  67
  68     def extendMarkdown(self, md, md_globals):
  69         """ Modify inline patterns. """
  70         md.inlinePatterns['strong'] = SimpleTagPattern(STRONG_RE, 'strong')
  71         md.inlinePatterns.add('strong2', SimpleTagPattern(SMART_STRONG_RE, 'strong'), '>emphasis2')
  72
  73 def makeExtension(configs={}):
  74     return SmartEmphasisExtension(configs=dict(configs))