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# IVLE - Informatics Virtual Learning Environment
# Copyright (C) 2007-2008 The University of Melbourne
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
# Module: parse_exercise
# Author: Dilshan Angampitiya
# Steven Bird (revisions)
# Date: 24/1/2008
"""
This file provides the function parse_exercise_file which takes an xml
specification of an exercise file and returns a test suite object for
that exercise. It throws a ParseException if there was a problem
parsing the file.
"""
from xml.dom.minidom import *
from TestFramework import *
DEFAULT_TEST_TYPE = 'norm'
DEFAULT_CASE_TYPE = 'match'
class ParseException(Exception):
" Error when parsing the xml exercise file "
def __init___(self, reason):
self._reason = reason
def __str__(self):
return self._reason
def getTextData(element):
""" Get the text and cdata inside an element
Leading and trailing whitespace are stripped
"""
data = ''
for child in element.childNodes:
if child.nodeType == child.CDATA_SECTION_NODE:
data += child.data
if child.nodeType == child.TEXT_NODE:
data += child.data
return data.strip()
def getCasePartData(partNode):
""" Create an TestCasePart instance from test part xml data
"""
func_pass = partNode.getAttribute('pass')
func_fail = partNode.getAttribute('fail')
default = partNode.getAttribute('default')
if default == '': default = DEFAULT_CASE_TYPE
part = TestCasePart(func_pass, func_fail, default)
for child in partNode.childNodes:
if child.nodeType != child.ELEMENT_NODE:
continue
if child.tagName == 'stdout':
test_type = child.getAttribute('type')
if test_type == '': test_type = DEFAULT_TEST_TYPE
part.add_stdout_test(getTextData(child), test_type)
elif child.tagName == 'stderr':
test_type = child.getAttribute('type')
if test_type == '': test_type = DEFAULT_TEST_TYPE
part.add_stderr_test(getTextData(child), test_type)
elif child.tagName == 'result':
test_type = child.getAttribute('type')
if test_type == '': test_type = DEFAULT_TEST_TYPE
part.add_result_test(getTextData(child), test_type)
elif child.tagName == 'exception':
test_type = child.getAttribute('type')
if test_type == '': test_type = DEFAULT_TEST_TYPE
part.add_exception_test(getTextData(child), test_type)
elif child.tagName == 'file':
test_type = child.getAttribute('type')
if test_type == '': test_type = DEFAULT_TEST_TYPE
filename = child.getAttribute('name')
if filename == '':
raise ParseException("File without name in case %s" %case_name)
part.add_file_test(filename, getTextData(child), test_type)
elif child.tagName == 'code':
test_type = child.getAttribute('type')
if test_type == '': test_type = DEFAULT_TEST_TYPE
part.add_code_test(getTextData(child), test_type)
return part
def getCaseData(caseNode):
""" Create a TestCase instance from test case xml data
"""
case_name = caseNode.getAttribute('name')
function = caseNode.getAttribute('function')
if function == '': function = None
case = TestCase(case_name, function)
for child in caseNode.childNodes:
if child.nodeType != child.ELEMENT_NODE:
continue
if child.tagName == 'stdin':
# standard input
case.set_stdin(getTextData(child))
elif child.tagName == 'file':
# file
filename = child.getAttribute('name')
if filename == '':
raise ParseException("File without name in case %s" %case_name)
case.add_file(filename, getTextData(child))
elif child.tagName == 'var':
# global variable
var_name = child.getAttribute('name')
var_val = child.getAttribute('value')
if not var_name or not var_val:
raise ParseException("Incomplete variable in case %s" %case_name)
case.add_variable(var_name, var_val)
elif child.tagName == 'arg':
# function argument
arg_val = child.getAttribute('value')
arg_name = child.getAttribute('name')
if arg_name == '': arg_name = None
if not arg_val:
raise ParseException("Incomplete argument in case %s" %case_name)
case.add_arg(arg_val, arg_name)
elif child.tagName == 'exception':
exception_name = child.getAttribute('name')
if not exception_name:
raise ParseException("Incomplete exception in case %s" %case_name)
case.add_exception(exception_name)
elif child.tagName == 'function':
# specify a test case part
case.add_part(getCasePartData(child))
return case
def parse_exercise_file(fileobj, exercise_num=1):
""" Parse an xml exercise file and return a testsuite for that exercise """
dom = parse(fileobj)
# get exercise
count = 0
exercise = None
for child in dom.childNodes:
if child.nodeType == child.ELEMENT_NODE and child.tagName == 'exercise':
count += 1
if count == exercise_num:
exercise = child
break
if exercise == None:
raise ParseException("Not enough exercises")
# get name
exercise_name = exercise.getAttribute('name')
if not exercise_name:
raise ParseException('Exercise name not supplied')
exercise_suite = TestSuite(exercise_name)
# get solution and include info
for child in exercise.childNodes:
if child.nodeType != child.ELEMENT_NODE:
continue
if child.tagName == 'solution':
exercise_suite.add_solution(getTextData(child))
elif child.tagName == 'include':
exercise_suite.add_include_code(getTextData(child))
elif child.tagName == 'case':
exercise_suite.add_case(getCaseData(child))
return exercise_suite
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