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# -*- Mode: Python; py-indent-offset: 4 -*-
# vim: tabstop=4 shiftwidth=4 expandtab
#
# Copyright (C) 2007-2009 Johan Dahlin <johan@gnome.org>
#
# module.py: dynamic module 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 os
import gobject
from ._gi import \
Repository, \
FunctionInfo, \
RegisteredTypeInfo, \
EnumInfo, \
ObjectInfo, \
InterfaceInfo, \
ConstantInfo, \
StructInfo, \
UnionInfo, \
Struct, \
Boxed, \
enum_add, \
flags_add
from .types import \
GObjectMeta, \
StructMeta, \
Function, \
Enum
repository = Repository.get_default()
def get_parent_for_object(object_info):
parent_object_info = object_info.get_parent()
if not parent_object_info:
return object
namespace = parent_object_info.get_namespace()
name = parent_object_info.get_name()
# Workaround for GObject.Object and GObject.InitiallyUnowned.
if namespace == 'GObject' and name == 'Object' or name == 'InitiallyUnowned':
return gobject.GObject
module = __import__('gi.repository.%s' % namespace, fromlist=[name])
return getattr(module, name)
def get_interfaces_for_object(object_info):
interfaces = []
for interface_info in object_info.get_interfaces():
namespace = interface_info.get_namespace()
name = interface_info.get_name()
module = __import__('gi.repository.%s' % namespace, fromlist=[name])
interfaces.append(getattr(module, name))
return interfaces
class IntrospectionModule(object):
def __init__(self, namespace, version=None):
repository.require(namespace, version)
self._namespace = namespace
self.version = version
self.__name__ = 'gi.repository.' + namespace
repository.require(self._namespace, self.version)
if self.version is None:
self.version = repository.get_version(self._namespace)
def __getattr__(self, name):
info = repository.find_by_name(self._namespace, name)
if not info:
raise AttributeError("%r object has no attribute %r" % (
self.__name__, name))
if isinstance(info, EnumInfo):
g_type = info.get_g_type()
wrapper = g_type.pytype
if wrapper is None:
if g_type.is_a(gobject.TYPE_ENUM):
wrapper = enum_add(g_type)
elif g_type.is_a(gobject.TYPE_NONE):
# An enum with a GType of None is an enum without GType
wrapper = Enum
else:
wrapper = flags_add(g_type)
wrapper.__info__ = info
wrapper.__module__ = 'gi.repository.' + info.get_namespace()
for value_info in info.get_values():
name = value_info.get_name().upper()
setattr(wrapper, name, wrapper(value_info.get_value()))
elif isinstance(info, RegisteredTypeInfo):
g_type = info.get_g_type()
# Check if there is already a Python wrapper.
if g_type != gobject.TYPE_NONE:
type_ = g_type.pytype
if type_ is not None:
self.__dict__[name] = type_
return type_
# Create a wrapper.
if isinstance(info, ObjectInfo):
parent = get_parent_for_object(info)
interfaces = tuple(interface for interface in get_interfaces_for_object(info)
if not issubclass(parent, interface))
bases = (parent,) + interfaces
metaclass = GObjectMeta
elif isinstance(info, InterfaceInfo):
bases = (gobject.GInterface,)
metaclass = GObjectMeta
elif isinstance(info, (StructInfo, UnionInfo)):
if g_type.is_a(gobject.TYPE_BOXED):
bases = (Boxed,)
elif g_type.is_a(gobject.TYPE_POINTER) or g_type == gobject.TYPE_NONE:
bases = (Struct,)
else:
raise TypeError("unable to create a wrapper for %s.%s" % (info.get_namespace(), info.get_name()))
metaclass = StructMeta
else:
raise NotImplementedError(info)
name = info.get_name()
dict_ = {
'__info__': info,
'__module__': 'gi.repository.' + self._namespace,
'__gtype__': g_type
}
wrapper = metaclass(name, bases, dict_)
# Register the new Python wrapper.
if g_type != gobject.TYPE_NONE:
g_type.pytype = wrapper
elif isinstance(info, FunctionInfo):
wrapper = Function(info)
elif isinstance(info, ConstantInfo):
wrapper = info.get_value()
else:
raise NotImplementedError(info)
self.__dict__[name] = wrapper
return wrapper
def __repr__(self):
path = repository.get_typelib_path(self._namespace)
return "<IntrospectionModule %r from %r>" % (self._namespace, path)
class DynamicGObjectModule(IntrospectionModule):
"""Wrapper for the GObject module
This class allows us to access both the static PyGObject module and the GI GObject module
through the same interface. It is returned when by importing GObject from the gi repository:
from gi.repository import GObject
We use this because some PyGI interfaces generated from the GIR require GObject types not wrapped
by the static bindings. This also allows access to module attributes in a way that is more
familiar to GI application developers. Take signal flags as an example. The G_SIGNAL_RUN_FIRST
flag would be accessed as GObject.SIGNAL_RUN_FIRST in the static bindings but in the dynamic bindings
can be accessed as GObject.SignalFlags.RUN_FIRST. The latter follows a GI naming convention which
would be familiar to GI application developers in a number of languages.
"""
def __init__(self):
IntrospectionModule.__init__(self, namespace='GObject')
def __getattr__(self, name):
# first see if this attr is in the gobject module
attr = getattr(gobject, name, None)
# if not in module assume request for an attr exported through GI
if attr is None:
attr = super(DynamicGObjectModule, self).__getattr__(name)
return attr
class DynamicModule(object):
def __init__(self, namespace):
self._namespace = namespace
self.introspection_module = None
self._version = None
self._overrides_module = None
def require_version(self, version):
if self.introspection_module is not None and \
self.introspection_module.version != version:
raise RuntimeError('Module has been already loaded ')
self._version = version
def _import(self):
self.introspection_module = IntrospectionModule(self._namespace,
self._version)
overrides_modules = __import__('gi.overrides', fromlist=[self._namespace])
self._overrides_module = getattr(overrides_modules, self._namespace, None)
def __getattr__(self, name):
if self.introspection_module is None:
self._import()
if self._overrides_module is not None:
override_exports = getattr(self._overrides_module, '__all__', ())
if name in override_exports:
return getattr(self._overrides_module, name, None)
return getattr(self.introspection_module, name)
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