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+# Python Markdown
+
+# A Python implementation of John Gruber's Markdown.
+
+# Documentation: https://python-markdown.github.io/
+# GitHub: https://github.com/Python-Markdown/markdown/
+# PyPI: https://pypi.org/project/Markdown/
+
+# Started by Manfred Stienstra (http://www.dwerg.net/).
+# Maintained for a few years by Yuri Takhteyev (http://www.freewisdom.org).
+# Currently maintained by Waylan Limberg (https://github.com/waylan),
+# Dmitry Shachnev (https://github.com/mitya57) and Isaac Muse (https://github.com/facelessuser).
+
+# Copyright 2007-2023 The Python Markdown Project (v. 1.7 and later)
+# Copyright 2004, 2005, 2006 Yuri Takhteyev (v. 0.2-1.6b)
+# Copyright 2004 Manfred Stienstra (the original version)
+
+# License: BSD (see LICENSE.md for details).
+
+"""
+The block parser handles basic parsing of Markdown blocks.  It doesn't concern
+itself with inline elements such as `**bold**` or `*italics*`, but rather just
+catches blocks, lists, quotes, etc.
+
+The `BlockParser` is made up of a bunch of `BlockProcessors`, each handling a
+different type of block. Extensions may add/replace/remove `BlockProcessors`
+as they need to alter how Markdown blocks are parsed.
+"""
+
+from __future__ import annotations
+
+import xml.etree.ElementTree as etree
+from typing import TYPE_CHECKING, Iterable, Any
+from . import util
+
+if TYPE_CHECKING:  # pragma: no cover
+    from markdown import Markdown
+    from .blockprocessors import BlockProcessor
+
+
+class State(list):
+    """ Track the current and nested state of the parser.
+
+    This utility class is used to track the state of the `BlockParser` and
+    support multiple levels if nesting. It's just a simple API wrapped around
+    a list. Each time a state is set, that state is appended to the end of the
+    list. Each time a state is reset, that state is removed from the end of
+    the list.
+
+    Therefore, each time a state is set for a nested block, that state must be
+    reset when we back out of that level of nesting or the state could be
+    corrupted.
+
+    While all the methods of a list object are available, only the three
+    defined below need be used.
+
+    """
+
+    def set(self, state: Any):
+        """ Set a new state. """
+        self.append(state)
+
+    def reset(self) -> None:
+        """ Step back one step in nested state. """
+        self.pop()
+
+    def isstate(self, state: Any) -> bool:
+        """ Test that top (current) level is of given state. """
+        if len(self):
+            return self[-1] == state
+        else:
+            return False
+
+
+class BlockParser:
+    """ Parse Markdown blocks into an `ElementTree` object.
+
+    A wrapper class that stitches the various `BlockProcessors` together,
+    looping through them and creating an `ElementTree` object.
+
+    """
+
+    def __init__(self, md: Markdown):
+        """ Initialize the block parser.
+
+        Arguments:
+            md: A Markdown instance.
+
+        Attributes:
+            BlockParser.md (Markdown): A Markdown instance.
+            BlockParser.state (State): Tracks the nesting level of current location in document being parsed.
+            BlockParser.blockprocessors (util.Registry): A collection of
+                [`blockprocessors`][markdown.blockprocessors].
+
+        """
+        self.blockprocessors: util.Registry[BlockProcessor] = util.Registry()
+        self.state = State()
+        self.md = md
+
+    def parseDocument(self, lines: Iterable[str]) -> etree.ElementTree:
+        """ Parse a Markdown document into an `ElementTree`.
+
+        Given a list of lines, an `ElementTree` object (not just a parent
+        `Element`) is created and the root element is passed to the parser
+        as the parent. The `ElementTree` object is returned.
+
+        This should only be called on an entire document, not pieces.
+
+        Arguments:
+            lines: A list of lines (strings).
+
+        Returns:
+            An element tree.
+        """
+        # Create an `ElementTree` from the lines
+        self.root = etree.Element(self.md.doc_tag)
+        self.parseChunk(self.root, '\n'.join(lines))
+        return etree.ElementTree(self.root)
+
+    def parseChunk(self, parent: etree.Element, text: str) -> None:
+        """ Parse a chunk of Markdown text and attach to given `etree` node.
+
+        While the `text` argument is generally assumed to contain multiple
+        blocks which will be split on blank lines, it could contain only one
+        block. Generally, this method would be called by extensions when
+        block parsing is required.
+
+        The `parent` `etree` Element passed in is altered in place.
+        Nothing is returned.
+
+        Arguments:
+            parent: The parent element.
+            text: The text to parse.
+
+        """
+        self.parseBlocks(parent, text.split('\n\n'))
+
+    def parseBlocks(self, parent: etree.Element, blocks: list[str]) -> None:
+        """ Process blocks of Markdown text and attach to given `etree` node.
+
+        Given a list of `blocks`, each `blockprocessor` is stepped through
+        until there are no blocks left. While an extension could potentially
+        call this method directly, it's generally expected to be used
+        internally.
+
+        This is a public method as an extension may need to add/alter
+        additional `BlockProcessors` which call this method to recursively
+        parse a nested block.
+
+        Arguments:
+            parent: The parent element.
+            blocks: The blocks of text to parse.
+
+        """
+        while blocks:
+            for processor in self.blockprocessors:
+                if processor.test(parent, blocks[0]):
+                    if processor.run(parent, blocks) is not False:
+                        # run returns True or None
+                        break