mirror of https://github.com/pallets/flask.git
74 lines
2.3 KiB
Python
74 lines
2.3 KiB
Python
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# -*- coding: utf-8 -*-
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"""
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flaskext_compat
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~~~~~~~~~~~~~~~
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Implements the ``flask.ext`` virtual package for versions of Flask
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older than 0.7. This module is a noop if Flask 0.8 was detected.
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Usage::
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import flaskext_compat
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from flask.ext import foo
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:copyright: (c) 2011 by Armin Ronacher.
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:license: BSD, see LICENSE for more details.
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"""
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class _ExtensionImporter(object):
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"""This importer redirects imports from this submodule to other locations.
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This makes it possible to transition from the old flaskext.name to the
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newer flask_name without people having a hard time.
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"""
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_module_choices = ['flask_%s', 'flaskext.%s']
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def __init__(self):
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from sys import meta_path
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self.prefix = __name__ + '.'
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self.prefix_cutoff = __name__.count('.') + 1
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# since people might reload the flask.ext module (by accident or
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# intentionally) we have to make sure to not add more than one
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# import hook. We can't check class types here either since a new
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# class will be created on reload. As a result of that we check
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# the name of the class and remove stale instances.
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def _name(x):
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cls = type(x)
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return cls.__module__ + '.' + cls.__name__
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this = _name(self)
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meta_path[:] = [x for x in meta_path if _name(x) != this] + [self]
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def find_module(self, fullname, path=None):
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if fullname.startswith(self.prefix):
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return self
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def load_module(self, fullname):
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from sys import modules
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if fullname in modules:
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return modules[fullname]
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modname = fullname.split('.', self.prefix_cutoff)[self.prefix_cutoff]
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for path in self._module_choices:
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realname = path % modname
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try:
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__import__(realname)
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except ImportError:
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continue
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module = modules[fullname] = modules[realname]
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if '.' not in modname:
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setattr(modules[__name__], modname, module)
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return module
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raise ImportError(fullname)
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import sys
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import flask
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try:
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__import__('flask.ext')
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except ImportError:
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sys.modules['flask.ext'] = flask.ext = sys.modules[__name__]
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__name__ = __package__ = 'flask.ext'
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__path__ = []
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_ExtensionImporter()
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del _ExtensionImporter, sys, flask
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