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from __future__ import unicode_literals
import sys
from contextlib import contextmanager
try:
from StringIO import StringIO
except ImportError:
from io import StringIO
# Local imports
from .file_utils import copy_files, delete_files
from .base_evaluator import BaseEvaluator
@contextmanager
def redirect_stdout():
new_target = StringIO()
old_target, sys.stdout = sys.stdout, new_target # replace sys.stdout
try:
yield new_target # run some code with the replaced stdout
finally:
sys.stdout = old_target # restore to the previous value
def _show_expected_given(expected, given):
return "Expected:\n{0}\nGiven:\n{1}\n".format(expected, given)
def compare_outputs(given, expected):
given_lines = given.splitlines()
ng = len(given_lines)
exp_lines = expected.splitlines()
ne = len(exp_lines)
if ng != ne:
msg = "ERROR: Got {0} lines in output, we expected {1}.\n".format(
ng, ne
)
msg += _show_expected_given(expected, given)
return False, msg
else:
for i, (given_line, expected_line) in \
enumerate(zip(given_lines, exp_lines)):
if given_line.strip() != expected_line.strip():
msg = "ERROR:\n"
msg += _show_expected_given(expected, given)
msg += "\nError in line %d of output.\n" % (i+1)
msg += "Expected line {0}:\n{1}\nGiven line {0}:\n{2}\n"\
.format(
i+1, expected_line, given_line
)
return False, msg
return True, "Correct answer."
class PythonStdIOEvaluator(BaseEvaluator):
"""Tests the Python code obtained from Code Server"""
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.expected_input = test_case_data.get('expected_input')
self.expected_output = test_case_data.get('expected_output')
self.weight = test_case_data.get('weight')
def teardown(self):
# Delete the created file.
if self.files:
delete_files(self.files)
def compile_code(self):
if self.file_paths:
self.files = copy_files(self.file_paths)
submitted = compile(self.user_answer, '<string>', mode='exec')
if self.expected_input:
input_buffer = StringIO()
input_buffer.write(self.expected_input)
input_buffer.seek(0)
sys.stdin = input_buffer
with redirect_stdout() as output_buffer:
exec_scope = {}
exec(submitted, exec_scope)
self.output_value = output_buffer.getvalue().rstrip("\n")
return self.output_value
def check_code(self):
mark_fraction = self.weight
success, err = compare_outputs(self.output_value, self.expected_output)
return success, err, mark_fraction
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