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49 lines
1.5 KiB
49 lines
1.5 KiB
''' |
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Legacy Em Extension for Python-Markdown |
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======================================= |
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This extension provides legacy behavior for _connected_words_. |
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Copyright 2015-2018 The Python Markdown Project |
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License: [BSD](https://opensource.org/licenses/bsd-license.php) |
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''' |
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from . import Extension |
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from ..inlinepatterns import UnderscoreProcessor, EmStrongItem, EM_STRONG2_RE, STRONG_EM2_RE |
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import re |
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# _emphasis_ |
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EMPHASIS_RE = r'(_)([^_]+)\1' |
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# __strong__ |
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STRONG_RE = r'(_{2})(.+?)\1' |
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# __strong_em___ |
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STRONG_EM_RE = r'(_)\1(?!\1)([^_]+?)\1(?!\1)(.+?)\1{3}' |
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class LegacyUnderscoreProcessor(UnderscoreProcessor): |
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"""Emphasis processor for handling strong and em matches inside underscores.""" |
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PATTERNS = [ |
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EmStrongItem(re.compile(EM_STRONG2_RE, re.DOTALL | re.UNICODE), 'double', 'strong,em'), |
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EmStrongItem(re.compile(STRONG_EM2_RE, re.DOTALL | re.UNICODE), 'double', 'em,strong'), |
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EmStrongItem(re.compile(STRONG_EM_RE, re.DOTALL | re.UNICODE), 'double2', 'strong,em'), |
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EmStrongItem(re.compile(STRONG_RE, re.DOTALL | re.UNICODE), 'single', 'strong'), |
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EmStrongItem(re.compile(EMPHASIS_RE, re.DOTALL | re.UNICODE), 'single', 'em') |
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] |
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class LegacyEmExtension(Extension): |
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""" Add legacy_em extension to Markdown class.""" |
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def extendMarkdown(self, md): |
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""" Modify inline patterns. """ |
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md.inlinePatterns.register(LegacyUnderscoreProcessor(r'_'), 'em_strong2', 50) |
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def makeExtension(**kwargs): # pragma: no cover |
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""" Return an instance of the `LegacyEmExtension` """ |
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return LegacyEmExtension(**kwargs)
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