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#! /usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright 2011-2013, Marten de Vries
#
# This file is part of OpenTeacher.
#
# OpenTeacher 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 3 of the License, or
# (at your option) any later version.
#
# OpenTeacher 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 OpenTeacher. If not, see <http://www.gnu.org/licenses/>.
import sys
import os
import imp
import moduleFilterer
class ModuleManager:
"""This class manages modules. It loads them from a directory when
they meet the requirements for being a module, and it offers a
few functions to the initialized modules, like getting resource
paths and handling imports in the module directory.
"""
def __init__(self, modulesPath, *args, **kwargs):
super().__init__(*args, **kwargs)
self.modulesPath = modulesPath
self._references = set()
self._loadModules()
@staticmethod
def _callerOfCallerPath():
callerFile = sys._getframe(2).f_code.co_filename
return os.path.dirname(callerFile)
@classmethod
def resourcePath(cls, resource=''):
return os.path.join(cls._callerOfCallerPath(), resource)
@property
def mods(self):
return moduleFilterer.ModuleFilterer(self._modules)
def importFrom(self, path, moduleName):
fp, pathname, description = imp.find_module(moduleName, [path])
try:
#import the module
module = imp.load_module(moduleName, fp, pathname, description)
#remove the module from the python cache, to avoid
#namespace clashes
del sys.modules[moduleName]
#but keep our own reference, otherwise the module namespace
#will probably be garbage collected.
self._references.add(module)
return module
finally:
fp.close()
def import_(self, moduleName):
return self.importFrom(self._callerOfCallerPath(), moduleName)
def _loadModules(self):
self._modules = set()
for root, dirs, files in os.walk(self.modulesPath):
name = os.path.split(root)[1]
valid = (
name + ".py" in files and
#os.sep so names like random_.py are allowed.
not os.sep + "_" in root
)
if valid:
container = self.importFrom(root, name)
module = container.init(self)
#To compensate for the missing __module__ attribute of
#the class Python has when importing normally.
path = os.path.join(root, name + ".py")
module.__class__.__file__ = os.path.abspath(path)
self._modules.add(module)
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