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from __future__ import unicode_literals
import os
import signal
# Local imports
from .base_evaluator import BaseEvaluator
from .grader import TimeoutException
class StdIOEvaluator(BaseEvaluator):
def evaluate_stdio(self, user_answer, proc, expected_input, expected_output):
success = False
ip = expected_input.replace(",", " ")
encoded_input = '{0}\n'.format(ip).encode('utf-8')
try:
user_output_bytes, output_err_bytes = proc.communicate(encoded_input)
user_output = user_output_bytes.decode('utf-8')
output_err = output_err_bytes.decode('utf-8')
except TimeoutException:
os.killpg(os.getpgid(proc.pid), signal.SIGTERM)
raise
expected_output = expected_output.replace("\r", "")
if not expected_input:
error_msg = "Expected Output is\n{0} ".\
format(str(expected_output))
else:
error_msg = "Given Input is\n{0}\nExpected Output is\n{1}".\
format(expected_input, str(expected_output))
if output_err == '':
if user_output == expected_output:
success, err = True, None
else:
err = "Incorrect answer:\n" + error_msg +\
"\nYour output is\n{0}".format(str(user_output))
else:
err = "Error:\n{0}".format(output_err)
return success, err
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