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Edit File: serialport.py

# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

"""
Serial Port Protocol
"""

# http://twistedmatrix.com/trac/ticket/3725#comment:24
# Apparently applications use these names even though they should
# be imported from pyserial
__all__ = [
    "serial",
    "PARITY_ODD",
    "PARITY_EVEN",
    "PARITY_NONE",
    "STOPBITS_TWO",
    "STOPBITS_ONE",
    "FIVEBITS",
    "EIGHTBITS",
    "SEVENBITS",
    "SIXBITS",
    # Name this module is actually trying to export
    "SerialPort",
]

# all of them require pyserial at the moment, so check that first
import serial  # type: ignore[import]
from serial import (
    EIGHTBITS,
    FIVEBITS,
    PARITY_EVEN,
    PARITY_NONE,
    PARITY_ODD,
    SEVENBITS,
    SIXBITS,
    STOPBITS_ONE,
    STOPBITS_TWO,
)

from twisted.python.runtime import platform

class BaseSerialPort:
    """
    Base class for Windows and POSIX serial ports.

@ivar _serialFactory: a pyserial C{serial.Serial} factory, used to create
        the instance stored in C{self._serial}. Overrideable to enable easier
        testing.

@ivar _serial: a pyserial C{serial.Serial} instance used to manage the
        options on the serial port.
    """

_serialFactory = serial.Serial

def setBaudRate(self, baudrate):
        if hasattr(self._serial, "setBaudrate"):
            self._serial.setBaudrate(baudrate)
        else:
            self._serial.setBaudRate(baudrate)

def inWaiting(self):
        return self._serial.inWaiting()

def flushInput(self):
        self._serial.flushInput()

def flushOutput(self):
        self._serial.flushOutput()

def sendBreak(self):
        self._serial.sendBreak()

def getDSR(self):
        return self._serial.getDSR()

def getCD(self):
        return self._serial.getCD()

def getRI(self):
        return self._serial.getRI()

def getCTS(self):
        return self._serial.getCTS()

def setDTR(self, on=1):
        self._serial.setDTR(on)

def setRTS(self, on=1):
        self._serial.setRTS(on)

# Expert appropriate implementation of SerialPort.
if platform.isWindows():
    from twisted.internet._win32serialport import SerialPort
else:
    from twisted.internet._posixserialport import SerialPort  # type: ignore[misc]