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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 | |
| 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) | |