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Rewrite emphasis handling #1632

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Rewrite emphasis handling #1632

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28 changes: 3 additions & 25 deletions markdown/extensions/legacy_em.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,29 +14,7 @@
from __future__ import annotations

from . import Extension
from ..inlinepatterns import UnderscoreProcessor, EmStrongItem, EM_STRONG2_RE, STRONG_EM2_RE
import re

# _emphasis_
EMPHASIS_RE = r'(_)([^_]+)\1'

# __strong__
STRONG_RE = r'(_{2})(.+?)\1'

# __strong_em___
STRONG_EM_RE = r'(_)\1(?!\1)([^_]+?)\1(?!\1)(.+?)\1{3}'


class LegacyUnderscoreProcessor(UnderscoreProcessor):
"""Emphasis processor for handling strong and em matches inside underscores."""

PATTERNS = [
EmStrongItem(re.compile(EM_STRONG2_RE, re.DOTALL | re.UNICODE), 'double', 'strong,em'),
EmStrongItem(re.compile(STRONG_EM2_RE, re.DOTALL | re.UNICODE), 'double', 'em,strong'),
EmStrongItem(re.compile(STRONG_EM_RE, re.DOTALL | re.UNICODE), 'double2', 'strong,em'),
EmStrongItem(re.compile(STRONG_RE, re.DOTALL | re.UNICODE), 'single', 'strong'),
EmStrongItem(re.compile(EMPHASIS_RE, re.DOTALL | re.UNICODE), 'single', 'em')
]
from ..inlinepatterns import DelimiterProcessor


class LegacyEmExtension(Extension):
Expand All @@ -50,8 +28,8 @@ def extendMarkdown(self, md):
| [`LegacyUnderscoreProcessor`][markdown.extensions.legacy_em.LegacyUnderscoreProcessor] | [`inlinepatterns`][markdown.inlinepatterns.build_inlinepatterns] | `em_strong2` | `50` |

"""
# flake8: noqa: E501 48-50
md.inlinePatterns.register(LegacyUnderscoreProcessor(r'_'), 'em_strong2', 50)
# flake8: noqa: E501 27-29
md.inlinePatterns.register(DelimiterProcessor(r'_', 'strong,em'), 'em_strong2', 50)


def makeExtension(**kwargs): # pragma: no cover
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