You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
144 lines
4.7 KiB
144 lines
4.7 KiB
# 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)
|