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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 2007-2018 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).
"""
import warnings
from ..util import parseBoolValue
class Extension:
""" Base class for extensions to subclass. """
# Default config -- to be overridden by a subclass
# Must be of the following format:
# {
# 'key': ['value', 'description']
# }
# Note that Extension.setConfig will raise a KeyError
# if a default is not set here.
config = {}
def __init__(self, **kwargs):
""" Initiate Extension and set up configs. """
self.setConfigs(kwargs)
def getConfig(self, key, default=''):
""" Return a setting for the given key or an empty string. """
if key in self.config:
return self.config[key][0]
else:
return default
def getConfigs(self):
""" Return all configs settings as a dict. """
return {key: self.getConfig(key) for key in self.config.keys()}
def getConfigInfo(self):
""" Return all config descriptions as a list of tuples. """
return [(key, self.config[key][1]) for key in self.config.keys()]
def setConfig(self, key, value):
""" Set a config setting for `key` with the given `value`. """
if isinstance(self.config[key][0], bool):
value = parseBoolValue(value)
if self.config[key][0] is None:
value = parseBoolValue(value, preserve_none=True)
self.config[key][0] = value
def setConfigs(self, items):
""" Set multiple config settings given a dict or list of tuples. """
if hasattr(items, 'items'):
# it's a dict
items = items.items()
for key, value in items:
self.setConfig(key, value)
def _extendMarkdown(self, *args):
""" Private wrapper around extendMarkdown. """
md = args[0]
try:
self.extendMarkdown(md)
except TypeError as e:
if "missing 1 required positional argument" in str(e):
# Must be a 2.x extension. Pass in a dumby md_globals.
self.extendMarkdown(md, {})
warnings.warn(
"The 'md_globals' parameter of '{}.{}.extendMarkdown' is "
"deprecated.".format(self.__class__.__module__, self.__class__.__name__),
category=DeprecationWarning,
stacklevel=2
)
else:
raise
def extendMarkdown(self, md):
"""
Add the various processors and patterns to the Markdown Instance.
This method must be overridden by every extension.
Keyword arguments:
* md: The Markdown instance.
* md_globals: Global variables in the markdown module namespace.
"""
raise NotImplementedError(
'Extension "%s.%s" must define an "extendMarkdown"'
'method.' % (self.__class__.__module__, self.__class__.__name__)
)
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