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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_server import TestCode
from registry import registry
class EvaluateC(TestCode):
"""Tests the C code obtained from Code Server"""
def evaluate_code(self):
submit_path = self._create_submit_code_file('submit.c')
get_ref_path = self.ref_code_path
ref_path, test_case_path = self._set_test_code_file_path(get_ref_path)
success = False
# Set file paths
c_user_output_path = os.getcwd() + '/output',
c_ref_output_path = os.getcwd() + '/executable',
# Set command variables
compile_command = 'g++ {0} -c -o {1}'.format(submit_path,
c_user_output_path),
compile_main = 'g++ {0} {1} -o {2}'.format(ref_path,
c_user_output_path,
c_ref_output_path),
run_command_args = c_ref_output_path
remove_user_output = c_user_output_path
remove_ref_output = c_ref_output_path
success, err = self.check_code(ref_path, submit_path, compile_command,
compile_main, run_command_args,
remove_user_output, remove_ref_output)
# Delete the created file.
os.remove(submit_path)
return success, err
def check_code(self, ref_code_path, submit_code_path, compile_command,
compile_main, run_command_args, remove_user_output,
remove_ref_output):
""" 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).
"""
if not isfile(ref_code_path):
return False, "No file at %s or Incorrect path" % ref_code_path
if not isfile(submit_code_path):
return False, 'No file at %s or Incorrect path' % submit_code_path
success = False
# output_path = os.getcwd() + '/output'
ret = self._compile_command(compile_command)
proc, stdnt_stderr = ret
# if self.language == "java":
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 == '':
ret = self._compile_command(compile_main)
proc, main_err = ret
# if self.language == "java":
# main_err = self._remove_null_substitute_char(main_err)
if main_err == '':
ret = self._run_command(run_command_args, 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(remove_ref_output)
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(remove_user_output)
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
def _remove_null_substitute_char(self, string):
"""Returns a string without any null and substitute characters"""
stripped = ""
for c in string:
if ord(c) is not 26 and ord(c) is not 0:
stripped = stripped + c
return ''.join(stripped)
registry.register('c', evaluate_c, EvaluateC)
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