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module.py
# -*- 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 import importlib from threading import Lock import gi from ._gi import \ Repository, \ FunctionInfo, \ RegisteredTypeInfo, \ EnumInfo, \ ObjectInfo, \ InterfaceInfo, \ ConstantInfo, \ StructInfo, \ UnionInfo, \ CallbackInfo, \ Struct, \ Boxed, \ Fundamental, \ CCallback, \ enum_add, \ enum_register_new_gtype_and_add, \ flags_add, \ flags_register_new_gtype_and_add, \ GInterface from .types import \ GObjectMeta, \ StructMeta from ._constants import \ TYPE_NONE, \ TYPE_BOXED, \ TYPE_POINTER, \ TYPE_ENUM, \ TYPE_FLAGS repository = Repository.get_default() # Cache of IntrospectionModules that have been loaded. _introspection_modules = {} def get_parent_for_object(object_info): parent_object_info = object_info.get_parent() if not parent_object_info: # If we reach the end of the introspection info class hierarchy, look # for an existing wrapper on the GType and use it as a base for the # new introspection wrapper. This allows static C wrappers already # registered with the GType to be used as the introspection base # (_gi.GObject for example) gtype = object_info.get_g_type() if gtype and gtype.pytype: return gtype.pytype if object_info.get_fundamental() and gtype.is_instantiatable(): return Fundamental # Otherwise use builtins.object as the base return object namespace = parent_object_info.get_namespace() name = parent_object_info.get_name() module = importlib.import_module('gi.repository.' + namespace) 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 = importlib.import_module('gi.repository.' + namespace) interfaces.append(getattr(module, name)) return interfaces class IntrospectionModule(object): """An object which wraps an introspection typelib. This wrapping creates a python module like representation of the typelib using gi repository as a foundation. Accessing attributes of the module will dynamically pull them in and create wrappers for the members. These members are then cached on this introspection module. """ def __init__(self, namespace, version=None): """Might raise gi._gi.RepositoryError""" repository.require(namespace, version) self._namespace = namespace self._version = version self.__name__ = 'gi.repository.' + namespace path = repository.get_typelib_path(self._namespace) self.__path__ = [path] if self._version is None: self._version = repository.get_version(self._namespace) self._lock = Lock() 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() with self._lock: wrapper = g_type.pytype if wrapper is None: if info.is_flags(): if g_type.is_a(TYPE_FLAGS): wrapper = flags_add(g_type) else: assert g_type == TYPE_NONE wrapper = flags_register_new_gtype_and_add(info) else: if g_type.is_a(TYPE_ENUM): wrapper = enum_add(g_type) else: assert g_type == TYPE_NONE wrapper = enum_register_new_gtype_and_add(info) wrapper.__info__ = info wrapper.__module__ = 'gi.repository.' + info.get_namespace() # Don't use upper() here to avoid locale specific # identifier conversion (e. g. in Turkish 'i'.upper() == 'i') # see https://bugzilla.gnome.org/show_bug.cgi?id=649165 ascii_upper_trans = ''.maketrans( 'abcdefgjhijklmnopqrstuvwxyz', 'ABCDEFGJHIJKLMNOPQRSTUVWXYZ') for value_info in info.get_values(): value_name = value_info.get_name_unescaped().translate(ascii_upper_trans) setattr(wrapper, value_name, wrapper(value_info.get_value())) for method_info in info.get_methods(): setattr(wrapper, method_info.__name__, method_info) if g_type != TYPE_NONE: g_type.pytype = wrapper elif isinstance(info, RegisteredTypeInfo): g_type = info.get_g_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, CallbackInfo): bases = (CCallback,) metaclass = GObjectMeta elif isinstance(info, InterfaceInfo): bases = (GInterface,) metaclass = GObjectMeta elif isinstance(info, (StructInfo, UnionInfo)): if g_type.is_a(TYPE_BOXED): bases = (Boxed,) elif (g_type.is_a(TYPE_POINTER) or g_type == TYPE_NONE or g_type.fundamental == g_type): 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) with self._lock: # Check if there is already a Python wrapper that is not a parent class # of the wrapper being created. If it is a parent, it is ok to clobber # g_type.pytype with a new child class wrapper of the existing parent. # Note that the return here never occurs under normal circumstances due # to caching on the __dict__ itself. if g_type != TYPE_NONE: type_ = g_type.pytype if type_ is not None and type_ not in bases: self.__dict__[name] = type_ return type_ dict_ = { '__info__': info, '__module__': 'gi.repository.' + self._namespace, '__gtype__': g_type } wrapper = metaclass(name, bases, dict_) # Register the new Python wrapper. if g_type != TYPE_NONE: g_type.pytype = wrapper elif isinstance(info, FunctionInfo): wrapper = info elif isinstance(info, ConstantInfo): wrapper = info.get_value() else: raise NotImplementedError(info) # Cache the newly created wrapper which will then be # available directly on this introspection module instead of being # lazily constructed through the __getattr__ we are currently in. self.__dict__[name] = wrapper return wrapper def __repr__(self): path = repository.get_typelib_path(self._namespace) return "<IntrospectionModule %r from %r>" % (self._namespace, path) def __dir__(self): # Python's default dir() is just dir(self.__class__) + self.__dict__.keys() result = set(dir(self.__class__)) result.update(self.__dict__.keys()) # update *set* because some repository attributes have already been # wrapped by __getattr__() and included in self.__dict__; but skip # Callback types, as these are not real objects which we can actually # get namespace_infos = repository.get_infos(self._namespace) result.update(info.get_name() for info in namespace_infos if not isinstance(info, CallbackInfo)) return list(result) def get_introspection_module(namespace): """ :Returns: An object directly wrapping the gi module without overrides. Might raise gi._gi.RepositoryError """ if namespace in _introspection_modules: return _introspection_modules[namespace] version = gi.get_required_version(namespace) module = IntrospectionModule(namespace, version) _introspection_modules[namespace] = module return module
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