events.py 文件源码

def to_bit_sequence(self, event):
        """ Creates an array of bits containing the details in the event
        dictionary. Once created, the array is cached to speed up future writes.

        Parameters
        ----------
        event: dict
            A dictionary describing the current component event. It should have
            3 keys: name, action, and metadata.

        Returns
        -------
        The array of bits
        """

        if event["metadata"] is None:
            nbytes = self.action_bytes + self.name_bytes
            metadata_array = []
        else:
            nbytes = self.metadata_bytes  + self.action_bytes + self.name_bytes
            try:
                metadata_array = np.fromstring(event["metadata"],
                                               dtype=np.uint16).astype(np.uint8)[:self.metadata_bytes]
            except TypeError:
                metadata_array = np.array(map(ord,
                                              event["metadata"].ljust(self.metadata_bytes)[:self.metadata_bytes]),
                                          dtype=np.uint8)

        int8_array = np.zeros(nbytes, dtype="uint8")
        int8_array[:self.name_bytes] = map(ord, event["name"].ljust(self.name_bytes)[:self.name_bytes])
        int8_array[self.name_bytes:self.name_bytes + self.action_bytes] = map(ord, event["action"].ljust(self.action_bytes)[:self.action_bytes])
        int8_array[self.name_bytes + self.action_bytes:] = metadata_array

        sequence = ([True] +
                    np.unpackbits(int8_array).astype(bool).tolist() +
                    [False])
        key = (event["name"], event["action"], event["metadata"])
        self.map_to_bit[key] = sequence

        return sequence