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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). | |
| """ | |
| Preprocessors work on source text before it is broken down into its individual parts. | |
| This is an excellent place to clean up bad characters or to extract portions for later | |
| processing that the parser may otherwise choke on. | |
| """ | |
| from __future__ import annotations | |
| from typing import TYPE_CHECKING, Any | |
| from . import util | |
| from .htmlparser import HTMLExtractor | |
| import re | |
| if TYPE_CHECKING: # pragma: no cover | |
| from markdown import Markdown | |
| def build_preprocessors(md: Markdown, **kwargs: Any) -> util.Registry[Preprocessor]: | |
| """ Build and return the default set of preprocessors used by Markdown. """ | |
| preprocessors = util.Registry() | |
| preprocessors.register(NormalizeWhitespace(md), 'normalize_whitespace', 30) | |
| preprocessors.register(HtmlBlockPreprocessor(md), 'html_block', 20) | |
| return preprocessors | |
| class Preprocessor(util.Processor): | |
| """ | |
| Preprocessors are run after the text is broken into lines. | |
| Each preprocessor implements a `run` method that takes a pointer to a | |
| list of lines of the document, modifies it as necessary and returns | |
| either the same pointer or a pointer to a new list. | |
| Preprocessors must extend `Preprocessor`. | |
| """ | |
| def run(self, lines: list[str]) -> list[str]: | |
| """ | |
| Each subclass of `Preprocessor` should override the `run` method, which | |
| takes the document as a list of strings split by newlines and returns | |
| the (possibly modified) list of lines. | |
| """ | |
| pass # pragma: no cover | |
| class NormalizeWhitespace(Preprocessor): | |
| """ Normalize whitespace for consistent parsing. """ | |
| def run(self, lines: list[str]) -> list[str]: | |
| source = '\n'.join(lines) | |
| source = source.replace(util.STX, "").replace(util.ETX, "") | |
| source = source.replace("\r\n", "\n").replace("\r", "\n") + "\n\n" | |
| source = source.expandtabs(self.md.tab_length) | |
| source = re.sub(r'(?<=\n) +\n', '\n', source) | |
| return source.split('\n') | |
| class HtmlBlockPreprocessor(Preprocessor): | |
| """ | |
| Remove html blocks from the text and store them for later retrieval. | |
| The raw HTML is stored in the [`htmlStash`][markdown.util.HtmlStash] of the | |
| [`Markdown`][markdown.Markdown] instance. | |
| """ | |
| def run(self, lines: list[str]) -> list[str]: | |
| source = '\n'.join(lines) | |
| parser = HTMLExtractor(self.md) | |
| parser.feed(source) | |
| parser.close() | |
| return ''.join(parser.cleandoc).split('\n') | |