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#!/usr/bin/env python
import sys
import traceback
import os
# Local imports
from .file_utils import copy_files, delete_files
from .base_evaluator import BaseEvaluator
from .grader import TimeoutException
class HookEvaluator(BaseEvaluator):
def __init__(self, metadata, test_case_data):
self.files = []
# 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.hook_code = test_case_data.get('hook_code')
self.weight = test_case_data.get('weight')
def teardown(self):
# Delete the created file.
if self.files:
delete_files(self.files)
def check_code(self):
""" Function evaluates user answer by running a python based hook code
against it.
Returns
--------
Returns a tuple (success, error, test_case_weight)
success - Boolean, indicating if code was executed successfully, correctly
mark_fraction - Float, indicating fraction of the weight to a test case
error - String, error message if success is false
returns (True, "Correct answer", 1.0) : If the student script passes all
test cases/have same output, when compared to the instructor script
returns (False, error_msg, 0.0): If the student script fails a single
test/have dissimilar output, when compared to the instructor script.
Returns (False, error_msg, 0.0): If mandatory arguments are not files or if
the required permissions are not given to the file(s).
"""
success = False
mark_fraction = 0.0
try:
tb = None
_tests = compile(self.hook_code, '<string>', mode='exec')
hook_scope = {}
exec(_tests, hook_scope)
check = hook_scope["check_answer"]
success, err, mark_fraction = check(self.user_answer)
except TimeoutException:
raise
except Exception:
msg = traceback.format_exc(limit=0)
err = "Error in Hook code: {0}".format(msg)
del tb
return success, err, mark_fraction
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