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import sys
from contextlib import contextmanager
try:
from StringIO import StringIO
except ImportError:
from io import StringIO
try:
from itertools import zip_longest
except ImportError:
from itertools import izip_longest as zip_longest
# 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 _incorrect_user_lines(exp_lines, user_lines):
err_line_no = []
for i, (expected_line, user_line) in enumerate(zip_longest(exp_lines, user_lines)):
if not user_line or not expected_line:
err_line_no.append(i)
else:
if user_line.strip() != expected_line.strip():
err_line_no.append(i)
return err_line_no
def compare_outputs(expected_output, user_output,given_input=None):
given_lines = user_output.splitlines()
exp_lines = expected_output.splitlines()
# if given_input:
# given_input = given_input.splitlines()
msg = {"given_input":given_input,
"expected_output": exp_lines,
"user_output":given_lines
}
ng = len(given_lines)
ne = len(exp_lines)
if ng != ne:
err_line_no = _incorrect_user_lines(exp_lines, given_lines)
msg["error_no"] = err_line_no
msg["error"] = "We had expected {0} number of lines. We got {1} number of lines.".format(ne, ng)
return False, msg
else:
err_line_no = _incorrect_user_lines(exp_lines, given_lines)
if err_line_no:
msg["error_no"] = err_line_no
msg["error"] = "Line number(s) {0} did not match."\
.format(", ".join(map(str,[x+1 for x in err_line_no])))
return False, msg
else:
msg["error"] = "Correct answer"
return True, msg
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.expected_output,
self.output_value,
self.expected_input
)
return success, err, mark_fraction
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