53 lines
1.7 KiB
Python
53 lines
1.7 KiB
Python
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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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This extension provides legacy behavior for _connected_words_.
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"""
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from __future__ import annotations
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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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