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@russgray russgray/subscript.py
Last active Apr 27, 2016

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"""Subscript extension for Markdown.
To subscript something, place a tilde symbol, '~', before and after the
text that you would like in subscript: C~6~H~12~O~6~
The numbers in this example will be subscripted. See below for more:
Examples:
>>> import markdown
>>> md = markdown.Markdown(extensions=['subscript'])
>>> md.convert('This is sugar: C~6~H~12~O~6~')
u'<p>This is sugar: C<sub>6</sub>H<sub>12</sub>O<sub>6</sub></p>'
Paragraph breaks will nullify subscripts across paragraphs. Line breaks
within paragraphs will not.
"""
import markdown
# Global Vars
SUBSCRIPT_RE = r'(\~)([^\~]*)\2' # the number is subscript~2~
class SubscriptPattern(markdown.inlinepatterns.Pattern):
""" Return a subscript Element: `C~6~H~12~O~6~' """
def handleMatch(self, m):
subsc = m.group(3)
text = subsc
el = markdown.util.etree.Element("sub")
el.text = markdown.util.AtomicString(text)
return el
class SubscriptExtension(markdown.Extension):
""" Subscript Extension for Python-Markdown. """
def extendMarkdown(self, md, md_globals):
""" Replace subscript with SubscriptPattern """
md.inlinePatterns['subscript'] = SubscriptPattern(SUBSCRIPT_RE, md)
def makeExtension(*args, **kwargs):
return SubscriptExtension(*args, **kwargs)
if __name__ == "__main__":
import doctest
doctest.testmod()
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