codekingpro/portable-devtools

1"""2    Implements signals based on blinker if available, otherwise3    falls silently back to a noop. Shamelessly stolen from flask.signals:4    https://github.com/mitsuhiko/flask/blob/master/flask/signals.py5"""6signals_available = False7try:8    from blinker import Namespace9    signals_available = True10except ImportError:11    class Namespace:12        def signal(self, name, doc=None):13            return _FakeSignal(name, doc)14 15    class _FakeSignal:16        """If blinker is unavailable, create a fake class with the same17        interface that allows sending of signals but will fail with an18        error on anything else.  Instead of doing anything on send, it19        will just ignore the arguments and do nothing instead.20        """21 22        def __init__(self, name, doc=None):23            self.name = name24            self.__doc__ = doc25        def _fail(self, *args, **kwargs):26            raise RuntimeError('signalling support is unavailable '27                               'because the blinker library is '28                               'not installed.')29        def send(*a, **kw):30            return None31        connect = disconnect = has_receivers_for = receivers_for = \32            temporarily_connected_to = connected_to = _fail33        del _fail34 35# The namespace for code signals.  If you are not oauthlib code, do36# not put signals in here.  Create your own namespace instead.37_signals = Namespace()38 39 40# Core signals.41scope_changed = _signals.signal('scope-changed')42