Revert of Check in a simple pure-python based Markdown previewer.

third_party/Python-Markdown/markdown/extensions/__init__.py

-"""
-Extensions
------------------------------------------------------------------------------
-"""
-
-from __future__ import unicode_literals
-from ..util import parseBoolValue
-import warnings
-
-
-class Extension(object):
-    """ Base class for extensions to subclass. """
-
-    # Default config -- to be overriden 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, *args, **kwargs):
-        """ Initiate Extension and set up configs. """
-
-        # check for configs arg for backward compat.
-        # (there only ever used to be one so we use arg[0])
-        if len(args):
-            if args[0] is not None:
-                self.setConfigs(args[0])
-            warnings.warn('Extension classes accepting positional args is '
-                          'pending Deprecation. Each setting should be '
-                          'passed into the Class as a keyword. Positional '
-                          'args are deprecated and will raise '
-                          'an error in version 2.7. See the Release Notes for '
-                          'Python-Markdown version 2.6 for more info.',
-                          DeprecationWarning)
-        # check for configs kwarg for backward compat.
-        if 'configs' in kwargs.keys():
-            if kwargs['configs'] is not None:
-                self.setConfigs(kwargs.pop('configs', {}))
-            warnings.warn('Extension classes accepting a dict on the single '
-                          'keyword "config" is pending Deprecation. Each '
-                          'setting should be passed into the Class as a '
-                          'keyword directly. The "config" keyword is '
-                          'deprecated and raise an error in '
-                          'version 2.7. See the Release Notes for '
-                          'Python-Markdown version 2.6 for more info.',
-                          DeprecationWarning)
-        # finally, use kwargs
-        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 dict([(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, md, md_globals):
-        """
-        Add the various proccesors and patterns to the Markdown Instance.
-
-        This method must be overriden 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__)
-        )