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import fcntl

import os

import pty

import struct

import sys

import termios

import textwrap

import unittest

from bpython.test import TEST_CONFIG

from bpython.config import getpreferredencoding

try:

from twisted.internet import reactor

from twisted.internet.defer import Deferred

from twisted.internet.protocol import ProcessProtocol

from twisted.trial.unittest import TestCase as TrialTestCase

except ImportError:

class TrialTestCase: # type: ignore [no-redef]

pass

reactor = None # type: ignore

try:

import urwid

have_urwid = True

except ImportError:

have_urwid = False

def set_win_size(fd, rows, columns):

s = struct.pack("HHHH", rows, columns, 0, 0)

fcntl.ioctl(fd, termios.TIOCSWINSZ, s)

class CrashersTest:

backend = "cli"

def run_bpython(self, input):

"""

Run bpython (with `backend` as backend) in a subprocess and

enter the given input. Uses a test config that disables the

paste detection.

Returns bpython's output.

"""

result = Deferred()

encoding = getpreferredencoding()

class Protocol(ProcessProtocol):

STATES = (SEND_INPUT, COLLECT) = range(2)

def __init__(self):

self.data = ""

self.delayed_call = None

self.states = iter(self.STATES)

self.state = next(self.states)

def outReceived(self, data):

self.data += data.decode(encoding)

if self.delayed_call is not None:

self.delayed_call.cancel()

self.delayed_call = reactor.callLater(0.5, self.next)

def next(self):

self.delayed_call = None

if self.state == self.SEND_INPUT:

index = self.data.find(">>> ")

if index >= 0:

self.data = self.data[index + 4 :]

self.transport.write(input.encode(encoding))

self.state = next(self.states)

elif self.data == "\x1b[6n":

# this is a cursor position query

# respond that cursor is on row 2, column 1

self.transport.write("\x1b[2;1R".encode(encoding))

else:

self.transport.closeStdin()

if self.transport.pid is not None:

self.delayed_call = None

self.transport.signalProcess("TERM")

def processExited(self, reason):

if self.delayed_call is not None:

self.delayed_call.cancel()

result.callback(self.data)

(master, slave) = pty.openpty()

set_win_size(slave, 25, 80)

reactor.spawnProcess(

Protocol(),

sys.executable,

(

sys.executable,

"-m",

f"bpython.{self.backend}",

"--config",

str(TEST_CONFIG),

"-q", # prevents version greeting

env={

"TERM": "vt100",

"LANG": os.environ.get("LANG", "C.UTF-8"),

usePTY=(master, slave, os.ttyname(slave)),

)

return result

def test_issue108(self):

input = textwrap.dedent(

"""\

def spam():

u"y\\xe4y"

spam("""

)

deferred = self.run_bpython(input)

return deferred.addCallback(self.check_no_traceback)

def test_issue133(self):

input = textwrap.dedent(

"""\

def spam(a, (b, c)):

pass

spam(1"""

)

return self.run_bpython(input).addCallback(self.check_no_traceback)

def check_no_traceback(self, data):

self.assertNotIn("Traceback", data)

@unittest.skipIf(reactor is None, "twisted is not available")

class CurtsiesCrashersTest(TrialTestCase, CrashersTest):

backend = "curtsies"

@unittest.skipIf(reactor is None, "twisted is not available")

class CursesCrashersTest(TrialTestCase, CrashersTest):

backend = "cli"

@unittest.skipUnless(have_urwid, "urwid is required")

@unittest.skipIf(reactor is None, "twisted is not available")

class UrwidCrashersTest(TrialTestCase, CrashersTest):

backend = "urwid"

if __name__ == "__main__":

unittest.main()