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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).
+
+"""
+
+Post-processors run on the text of the entire document after is has been serialized into a string.
+Postprocessors should be used to work with the text just before output. Usually, they are used add
+back sections that were extracted in a preprocessor, fix up outgoing encodings, or wrap the whole
+document.
+
+"""
+
+from __future__ import annotations
+
+from collections import OrderedDict
+from typing import TYPE_CHECKING, Any
+from . import util
+import re
+
+if TYPE_CHECKING:  # pragma: no cover
+    from markdown import Markdown
+
+
+def build_postprocessors(md: Markdown, **kwargs: Any) -> util.Registry[Postprocessor]:
+    """ Build the default postprocessors for Markdown. """
+    postprocessors = util.Registry()
+    postprocessors.register(RawHtmlPostprocessor(md), 'raw_html', 30)
+    postprocessors.register(AndSubstitutePostprocessor(), 'amp_substitute', 20)
+    return postprocessors
+
+
+class Postprocessor(util.Processor):
+    """
+    Postprocessors are run after the ElementTree it converted back into text.
+
+    Each Postprocessor implements a `run` method that takes a pointer to a
+    text string, modifies it as necessary and returns a text string.
+
+    Postprocessors must extend `Postprocessor`.
+
+    """
+
+    def run(self, text: str) -> str:
+        """
+        Subclasses of `Postprocessor` should implement a `run` method, which
+        takes the html document as a single text string and returns a
+        (possibly modified) string.
+
+        """
+        pass  # pragma: no cover
+
+
+class RawHtmlPostprocessor(Postprocessor):
+    """ Restore raw html to the document. """
+
+    BLOCK_LEVEL_REGEX = re.compile(r'^\<\/?([^ >]+)')
+
+    def run(self, text: str) -> str:
+        """ Iterate over html stash and restore html. """
+        replacements = OrderedDict()
+        for i in range(self.md.htmlStash.html_counter):
+            html = self.stash_to_string(self.md.htmlStash.rawHtmlBlocks[i])
+            if self.isblocklevel(html):
+                replacements["<p>{}</p>".format(
+                    self.md.htmlStash.get_placeholder(i))] = html
+            replacements[self.md.htmlStash.get_placeholder(i)] = html
+
+        def substitute_match(m: re.Match[str]) -> str:
+            key = m.group(0)
+
+            if key not in replacements:
+                if key[3:-4] in replacements:
+                    return f'<p>{ replacements[key[3:-4]] }</p>'
+                else:
+                    return key
+
+            return replacements[key]
+
+        if replacements:
+            base_placeholder = util.HTML_PLACEHOLDER % r'([0-9]+)'
+            pattern = re.compile(f'<p>{ base_placeholder }</p>|{ base_placeholder }')
+            processed_text = pattern.sub(substitute_match, text)
+        else:
+            return text
+
+        if processed_text == text:
+            return processed_text
+        else:
+            return self.run(processed_text)
+
+    def isblocklevel(self, html: str) -> bool:
+        """ Check is block of HTML is block-level. """
+        m = self.BLOCK_LEVEL_REGEX.match(html)
+        if m:
+            if m.group(1)[0] in ('!', '?', '@', '%'):
+                # Comment, PHP etc...
+                return True
+            return self.md.is_block_level(m.group(1))
+        return False
+
+    def stash_to_string(self, text: str) -> str:
+        """ Convert a stashed object to a string. """
+        return str(text)
+
+
+class AndSubstitutePostprocessor(Postprocessor):
+    """ Restore valid entities """
+
+    def run(self, text: str) -> str:
+        text = text.replace(util.AMP_SUBSTITUTE, "&")
+        return text
+
+
+@util.deprecated(
+    "This class is deprecated and will be removed in the future; "
+    "use [`UnescapeTreeprocessor`][markdown.treeprocessors.UnescapeTreeprocessor] instead."
+)
+class UnescapePostprocessor(Postprocessor):
+    """ Restore escaped chars. """
+
+    RE = re.compile(r'{}(\d+){}'.format(util.STX, util.ETX))
+
+    def unescape(self, m: re.Match[str]) -> str:
+        return chr(int(m.group(1)))
+
+    def run(self, text: str) -> str:
+        return self.RE.sub(self.unescape, text)