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#!/usr/bin/env python
import traceback
import pwd
import os
from os.path import join, isfile
import subprocess
import importlib
# local imports
from code_evaluator import CodeEvaluator
class CppCodeEvaluator(CodeEvaluator):
"""Tests the C code obtained from Code Server"""
def setup(self):
super(CppCodeEvaluator, self).setup()
self.submit_code_path = self.create_submit_code_file('submit.c')
self.compiled_user_answer = None
self.compiled_test_code = None
def teardown(self):
super(CppCodeEvaluator, self).teardown()
# Delete the created file.
os.remove(self.submit_code_path)
def set_file_paths(self):
user_output_path = os.getcwd() + '/output'
ref_output_path = os.getcwd() + '/executable'
return user_output_path, ref_output_path
def get_commands(self, clean_ref_code_path, user_output_path,
ref_output_path):
compile_command = 'g++ {0} -c -o {1}'.format(self.submit_code_path,
user_output_path)
compile_main = 'g++ {0} {1} -o {2}'.format(clean_ref_code_path,
user_output_path,
ref_output_path)
return compile_command, compile_main
def compile_code(self, user_answer, test_case):
if self.compiled_user_answer and self.compiled_test_code:
return None
else:
ref_code_path = test_case
clean_ref_code_path, clean_test_case_path = self._set_test_code_file_path(ref_code_path)
if not isfile(clean_ref_code_path):
return False, "No file at %s or Incorrect path" % clean_ref_code_path
if not isfile(self.submit_code_path):
return False, 'No file at %s or Incorrect path' % self.submit_code_path
self.write_to_submit_code_file(self.submit_code_path, user_answer)
self.user_output_path, self.ref_output_path = self.set_file_paths()
self.compile_command, self.compile_main = self.get_commands(clean_ref_code_path, self.user_output_path, self.ref_output_path)
self.compiled_user_answer = self._run_command(self.compile_command,
shell=True,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
self.compiled_test_code = self._run_command(self.compile_main,
shell=True,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
return self.compiled_user_answer, self.compiled_test_code
def check_code(self, user_answer, test_case):
""" Function validates student code using instructor code as
reference.The first argument ref_code_path, is the path to
instructor code, it is assumed to have executable permission.
The second argument submit_code_path, is the path to the student
code, it is assumed to have executable permission.
Returns
--------
returns (True, "Correct answer") : If the student function returns
expected output when called by reference code.
returns (False, error_msg): If the student function fails to return
expected output when called by reference code.
Returns (False, error_msg): If mandatory arguments are not files or
if the required permissions are not given to the file(s).
"""
success = False
proc, stdnt_out, stdnt_stderr = self.compiled_user_answer
stdnt_stderr = self._remove_null_substitute_char(stdnt_stderr)
# Only if compilation is successful, the program is executed
# And tested with testcases
if stdnt_stderr == '':
proc, main_out, main_err = self.compiled_test_code
main_err = self._remove_null_substitute_char(main_err)
if main_err == '':
ret = self._run_command([self.ref_output_path], stdin=None,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
proc, stdout, stderr = ret
if proc.returncode == 0:
success, err = True, "Correct answer"
else:
err = stdout + "\n" + stderr
os.remove(self.ref_output_path)
else:
err = "Error:"
try:
error_lines = main_err.splitlines()
for e in error_lines:
if ':' in e:
err = err + "\n" + e.split(":", 1)[1]
else:
err = err + "\n" + e
except:
err = err + "\n" + main_err
os.remove(self.user_output_path)
else:
err = "Compilation Error:"
try:
error_lines = stdnt_stderr.splitlines()
for e in error_lines:
if ':' in e:
err = err + "\n" + e.split(":", 1)[1]
else:
err = err + "\n" + e
except:
err = err + "\n" + stdnt_stderr
return success, err
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