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#!/usr/bin/env python
from __future__ import unicode_literals
import traceback
import pwd
import os
from os.path import join, isfile
import subprocess
# Local imports
from .file_utils import copy_files, delete_files
from .base_evaluator import BaseEvaluator
class CppCodeEvaluator(BaseEvaluator):
"""Tests the C code obtained from Code Server"""
def __init__(self, metadata, test_case_data):
self.files = []
self.submit_code_path = ''
self.compiled_user_answer = None
self.compiled_test_code = None
self.user_output_path = ""
self.ref_output_path = ""
# Set metadata values
self.user_answer = metadata.get('user_answer')
self.file_paths = metadata.get('file_paths')
self.partial_grading = metadata.get('partial_grading')
# Set test case data values
self.test_case = test_case_data.get('test_case')
self.weight = test_case_data.get('weight')
def teardown(self):
# Delete the created file.
os.remove(self.submit_code_path)
if os.path.exists(self.ref_output_path):
os.remove(self.ref_output_path)
if os.path.exists(self.user_output_path):
os.remove(self.user_output_path)
if self.files:
delete_files(self.files)
def set_file_paths(self):
user_output_path = os.getcwd() + '/output_file'
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):
if self.compiled_user_answer and self.compiled_test_code:
return None
else:
ref_code_path = self.test_case
clean_ref_code_path, clean_test_case_path = \
self._set_test_code_file_path(ref_code_path)
self.submit_code_path = self.create_submit_code_file('submit.c')
if self.file_paths:
self.files = copy_files(self.file_paths)
if not isfile(clean_ref_code_path):
msg = "No file at %s or Incorrect path" % clean_ref_code_path
return False, msg
if not isfile(self.submit_code_path):
msg = "No file at %s or Incorrect path" % self.submit_code_path
return False, msg
self.write_to_submit_code_file(self.submit_code_path, self.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):
""" 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
mark_fraction = 0.0
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, None
mark_fraction = float(self.weight) if self.partial_grading else 0.0
else:
err = "{0} \n {1}".format(stdout, stderr)
else:
err = "Error:"
try:
error_lines = main_err.splitlines()
for e in error_lines:
if ':' in e:
err = "{0} \n {1}".format(err, e.split(":", 1)[1])
else:
err = "{0} \n {1}".format(err, e)
except:
err = "{0} \n {1}".format(err, main_err)
else:
err = "Compilation Error:"
try:
error_lines = stdnt_stderr.splitlines()
for e in error_lines:
if ':' in e:
err = "{0} \n {1}".format(err, e.split(":", 1)[1])
else:
err = "{0} \n {1}".format(err, e)
except:
err = "{0} \n {1}".format(err, stdnt_stderr)
return success, err, mark_fraction
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