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145 lines
4.7 KiB
Python
145 lines
4.7 KiB
Python
# Python Markdown
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# A Python implementation of John Gruber's Markdown.
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# Documentation: https://python-markdown.github.io/
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# GitHub: https://github.com/Python-Markdown/markdown/
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# PyPI: https://pypi.org/project/Markdown/
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# Started by Manfred Stienstra (http://www.dwerg.net/).
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# Maintained for a few years by Yuri Takhteyev (http://www.freewisdom.org).
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# Currently maintained by Waylan Limberg (https://github.com/waylan),
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# Dmitry Shachnev (https://github.com/mitya57) and Isaac Muse (https://github.com/facelessuser).
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# Copyright 2007-2023 The Python Markdown Project (v. 1.7 and later)
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# Copyright 2004, 2005, 2006 Yuri Takhteyev (v. 0.2-1.6b)
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# Copyright 2004 Manfred Stienstra (the original version)
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# License: BSD (see LICENSE.md for details).
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"""
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Markdown accepts an [`Extension`][markdown.extensions.Extension] instance for each extension. Therefore, each extension
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must to define a class that extends [`Extension`][markdown.extensions.Extension] and over-rides the
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[`extendMarkdown`][markdown.extensions.Extension.extendMarkdown] method. Within this class one can manage configuration
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options for their extension and attach the various processors and patterns which make up an extension to the
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[`Markdown`][markdown.Markdown] instance.
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"""
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from __future__ import annotations
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from typing import TYPE_CHECKING, Any, Iterable, Mapping
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from ..util import parseBoolValue
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if TYPE_CHECKING: # pragma: no cover
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from markdown import Markdown
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class Extension:
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""" Base class for extensions to subclass. """
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config: Mapping[str, list] = {}
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"""
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Default configuration for an extension.
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This attribute is to be defined in a subclass and must be of the following format:
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``` python
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config = {
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'key': ['value', 'description']
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}
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```
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Note that [`setConfig`][markdown.extensions.Extension.setConfig] will raise a [`KeyError`][]
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if a default is not set for each option.
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"""
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def __init__(self, **kwargs):
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""" Initiate Extension and set up configs. """
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self.setConfigs(kwargs)
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def getConfig(self, key: str, default: Any = '') -> Any:
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"""
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Return a single configuration option value.
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Arguments:
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key: The configuration option name.
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default: Default value to return if key is not set.
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Returns:
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Value of stored configuration option.
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"""
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if key in self.config:
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return self.config[key][0]
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else:
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return default
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def getConfigs(self) -> dict[str, Any]:
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"""
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Return all configuration options.
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Returns:
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All configuration options.
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"""
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return {key: self.getConfig(key) for key in self.config.keys()}
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def getConfigInfo(self) -> list[tuple[str, str]]:
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"""
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Return descriptions of all configuration options.
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Returns:
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All descriptions of configuration options.
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"""
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return [(key, self.config[key][1]) for key in self.config.keys()]
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def setConfig(self, key: str, value: Any) -> None:
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"""
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Set a configuration option.
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If the corresponding default value set in [`config`][markdown.extensions.Extension.config]
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is a `bool` value or `None`, then `value` is passed through
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[`parseBoolValue`][markdown.util.parseBoolValue] before being stored.
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Arguments:
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key: Name of configuration option to set.
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value: Value to assign to option.
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Raises:
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KeyError: If `key` is not known.
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"""
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if isinstance(self.config[key][0], bool):
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value = parseBoolValue(value)
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if self.config[key][0] is None:
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value = parseBoolValue(value, preserve_none=True)
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self.config[key][0] = value
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def setConfigs(self, items: Mapping[str, Any] | Iterable[tuple[str, Any]]) -> None:
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"""
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Loop through a collection of configuration options, passing each to
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[`setConfig`][markdown.extensions.Extension.setConfig].
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Arguments:
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items: Collection of configuration options.
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Raises:
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KeyError: for any unknown key.
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"""
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if hasattr(items, 'items'):
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# it's a dict
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items = items.items()
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for key, value in items:
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self.setConfig(key, value)
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def extendMarkdown(self, md: Markdown) -> None:
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"""
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Add the various processors and patterns to the Markdown Instance.
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This method must be overridden by every extension.
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Arguments:
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md: The Markdown instance.
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"""
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raise NotImplementedError(
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'Extension "%s.%s" must define an "extendMarkdown"'
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'method.' % (self.__class__.__module__, self.__class__.__name__)
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)
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