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+# Sane List Extension for Python-Markdown
+# =======================================
+
+# Modify the behavior of Lists in Python-Markdown to act in a sane manor.
+
+# See https://Python-Markdown.github.io/extensions/sane_lists
+# for documentation.
+
+# Original code Copyright 2011 [Waylan Limberg](http://achinghead.com)
+
+# All changes Copyright 2011-2014 The Python Markdown Project
+
+# License: [BSD](https://opensource.org/licenses/bsd-license.php)
+
+"""
+Modify the behavior of Lists in Python-Markdown to act in a sane manor.
+
+See [documentation](https://Python-Markdown.github.io/extensions/sane_lists)
+for details.
+"""
+
+from __future__ import annotations
+
+from . import Extension
+from ..blockprocessors import OListProcessor, UListProcessor
+import re
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING: # pragma: no cover
+ from .. import blockparser
+
+
+class SaneOListProcessor(OListProcessor):
+ """ Override `SIBLING_TAGS` to not include `ul` and set `LAZY_OL` to `False`. """
+
+ SIBLING_TAGS = ['ol']
+ """ Exclude `ul` from list of siblings. """
+ LAZY_OL = False
+ """ Disable lazy list behavior. """
+
+ def __init__(self, parser: blockparser.BlockParser):
+ super().__init__(parser)
+ self.CHILD_RE = re.compile(r'^[ ]{0,%d}((\d+\.))[ ]+(.*)' %
+ (self.tab_length - 1))
+
+
+class SaneUListProcessor(UListProcessor):
+ """ Override `SIBLING_TAGS` to not include `ol`. """
+
+ SIBLING_TAGS = ['ul']
+ """ Exclude `ol` from list of siblings. """
+
+ def __init__(self, parser: blockparser.BlockParser):
+ super().__init__(parser)
+ self.CHILD_RE = re.compile(r'^[ ]{0,%d}(([*+-]))[ ]+(.*)' %
+ (self.tab_length - 1))
+
+
+class SaneListExtension(Extension):
+ """ Add sane lists to Markdown. """
+
+ def extendMarkdown(self, md):
+ """ Override existing Processors. """
+ md.parser.blockprocessors.register(SaneOListProcessor(md.parser), 'olist', 40)
+ md.parser.blockprocessors.register(SaneUListProcessor(md.parser), 'ulist', 30)
+
+
+def makeExtension(**kwargs): # pragma: no cover
+ return SaneListExtension(**kwargs)