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# -*- Mode: Python; py-indent-offset: 4 -*-
# vim: tabstop=4 shiftwidth=4 expandtab
#
# Copyright (C) 2005-2009 Johan Dahlin <johan@gnome.org>
#
# importer.py: dynamic importer for introspected libraries.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
# USA
from __future__ import absolute_import
import sys
import gobject
from ._gi import Repository, RepositoryError
from .module import DynamicModule
repository = Repository.get_default()
class DynamicImporter(object):
# Note: see PEP302 for the Importer Protocol implemented below.
def __init__(self, path):
self.path = path
def _create_module(self, module_type, name, namespace):
module = module_type.__new__(module_type)
module.__dict__ = {
'__file__': '<%s>' % name,
'__name__': name,
'__namespace__': namespace,
'__loader__': self
}
module.__init__()
return module
def find_module(self, fullname, path=None):
if not fullname.startswith(self.path):
return
path, namespace = fullname.rsplit('.', 1)
if path != self.path:
return
try:
repository.require(namespace)
except RepositoryError:
pass
else:
return self
def load_module(self, fullname):
if fullname in sys.modules:
return sys.modules[fullname]
path, namespace = fullname.rsplit('.', 1)
# Workaround for GObject
if namespace == 'GObject':
sys.modules[fullname] = gobject
return gobject
module_type = DynamicModule
module = self._create_module(module_type, fullname, namespace)
sys.modules[fullname] = module
# Look for an overrides module
overrides_name = 'gi.overrides.%s' % namespace
overrides_type_name = '%sModule' % namespace
try:
overrides_module = __import__(overrides_name, fromlist=[overrides_type_name])
module_type = getattr(overrides_module, overrides_type_name)
except ImportError, e:
pass
if module_type is not DynamicModule:
module = self._create_module(module_type, fullname, namespace)
sys.modules[fullname] = module
return module
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