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| # Meta Data Extension for Python-Markdown | |
| # ======================================= | |
| # This extension adds Meta Data handling to markdown. | |
| # See https://Python-Markdown.github.io/extensions/meta_data | |
| # for documentation. | |
| # Original code Copyright 2007-2008 [Waylan Limberg](http://achinghead.com). | |
| # All changes Copyright 2008-2014 The Python Markdown Project | |
| # License: [BSD](https://opensource.org/licenses/bsd-license.php) | |
| """ | |
| This extension adds Meta Data handling to markdown. | |
| See the [documentation](https://Python-Markdown.github.io/extensions/meta_data) | |
| for details. | |
| """ | |
| from __future__ import annotations | |
| from . import Extension | |
| from ..preprocessors import Preprocessor | |
| import re | |
| import logging | |
| from typing import Any | |
| log = logging.getLogger('MARKDOWN') | |
| # Global Vars | |
| META_RE = re.compile(r'^[ ]{0,3}(?P<key>[A-Za-z0-9_-]+):\s*(?P<value>.*)') | |
| META_MORE_RE = re.compile(r'^[ ]{4,}(?P<value>.*)') | |
| BEGIN_RE = re.compile(r'^-{3}(\s.*)?') | |
| END_RE = re.compile(r'^(-{3}|\.{3})(\s.*)?') | |
| class MetaExtension (Extension): | |
| """ Meta-Data extension for Python-Markdown. """ | |
| def extendMarkdown(self, md): | |
| """ Add `MetaPreprocessor` to Markdown instance. """ | |
| md.registerExtension(self) | |
| self.md = md | |
| md.preprocessors.register(MetaPreprocessor(md), 'meta', 27) | |
| def reset(self) -> None: | |
| self.md.Meta = {} | |
| class MetaPreprocessor(Preprocessor): | |
| """ Get Meta-Data. """ | |
| def run(self, lines: list[str]) -> list[str]: | |
| """ Parse Meta-Data and store in Markdown.Meta. """ | |
| meta: dict[str, Any] = {} | |
| key = None | |
| if lines and BEGIN_RE.match(lines[0]): | |
| lines.pop(0) | |
| while lines: | |
| line = lines.pop(0) | |
| m1 = META_RE.match(line) | |
| if line.strip() == '' or END_RE.match(line): | |
| break # blank line or end of YAML header - done | |
| if m1: | |
| key = m1.group('key').lower().strip() | |
| value = m1.group('value').strip() | |
| try: | |
| meta[key].append(value) | |
| except KeyError: | |
| meta[key] = [value] | |
| else: | |
| m2 = META_MORE_RE.match(line) | |
| if m2 and key: | |
| # Add another line to existing key | |
| meta[key].append(m2.group('value').strip()) | |
| else: | |
| lines.insert(0, line) | |
| break # no meta data - done | |
| self.md.Meta = meta | |
| return lines | |
| def makeExtension(**kwargs): # pragma: no cover | |
| return MetaExtension(**kwargs) | |