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name : sane_lists.py
 # 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)
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