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# CodeQ: an online programming tutor.
# Copyright (C) 2015 UL FRI
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU Affero General Public License as published by the Free
# Software Foundation, either version 3 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 Affero General Public License for more
# details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import sys
import importlib.machinery
import threading
import os.path
import logging
_path_prefix = os.environ.get('CODEQ_PROBLEMS') or '/var/local/codeq-problems'
_module_loading_lock = threading.RLock() # TODO: make a more fine-grained locking import machinery
def load_module(fullname):
# return importlib.import_module(fullname)
with _module_loading_lock:
mod = sys.modules.get(fullname, None)
if mod is None:
parts = fullname.split('.')
d = os.path.join(_path_prefix, *parts[:-1])
ff = importlib.machinery.FileFinder(d, (importlib.machinery.SourceFileLoader, ['.py']))
spec = ff.find_spec(fullname)
if spec is None:
logging.error('ERROR: there is no problem module {0}'.format(fullname))
return None
mod = type(sys)(fullname)
mod.__loader__ = spec.loader
mod.__package__ = spec.parent
mod.__spec__ = spec
if spec.has_location:
mod.__file__ = spec.origin
mod.__cached__ = spec.cached
sys.modules[fullname] = mod
try:
spec.loader.exec_module(mod)
except:
try:
del sys.modules[fullname]
except KeyError:
pass
raise
return mod
def load_language(language, tail_module):
return load_module('{0}.{1}'.format(language, tail_module))
def load_group(language, problem_group, tail_module):
return load_module('{0}.problems.{1}.{2}'.format(language, problem_group, tail_module))
def load_problem(language, problem_group, problem, tail_module):
return load_module('{0}.problems.{1}.{2}.{3}'.format(language, problem_group, problem, tail_module))
def load_facts(language, fact_module):
return load_module('{0}.facts.{1}'.format(language, fact_module))
def load_problems(language, tuples, tail_module):
modules = []
for problem_group, problem in tuples:
mod = '{0}.problems.{1}.{2}.{3}'.format(language, problem_group, problem, tail_module)
modules.append(load_module(mod))
return modules
def get_facts(language, problem_module):
try:
facts = problem_module.facts
except AttributeError as e:
return None
if facts is None:
return None
module = load_facts(language, facts)
if module:
try:
return module.facts
except AttributeError as e:
return None
return None
def solutions_for_problems(language, tuples):
if not tuples:
return ''
modules = load_problems(language, tuples, 'common')
solutions = []
for module in modules:
try:
solutions.append(module.solution)
except AttributeError as me:
pass
return '\n'.join(solutions)
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