/usr/lib/python3/dist-packages/gi/types.py is in python3-gi 3.2.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# vim: tabstop=4 shiftwidth=4 expandtab
#
# Copyright (C) 2005-2009 Johan Dahlin <johan@gnome.org>
#
# types.py: base types for introspected items.
#
# 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
from . import _gobject
from ._gi import \
InterfaceInfo, \
ObjectInfo, \
StructInfo, \
VFuncInfo, \
register_interface_info, \
hook_up_vfunc_implementation
if sys.version_info > (3, 0):
def callable(obj):
return hasattr(obj, '__call__')
def Function(info):
def function(*args, **kwargs):
return info.invoke(*args, **kwargs)
function.__info__ = info
function.__name__ = info.get_name()
function.__module__ = info.get_namespace()
return function
class NativeVFunc(object):
def __init__(self, info):
self._info = info
def __get__(self, instance, klass):
def native_vfunc(*args, **kwargs):
return self._info.invoke(klass.__gtype__, *args, **kwargs)
native_vfunc.__info__ = self._info
native_vfunc.__name__ = self._info.get_name()
native_vfunc.__module__ = self._info.get_namespace()
return native_vfunc
def Constructor(info):
def constructor(cls, *args, **kwargs):
cls_name = info.get_container().get_name()
if cls.__name__ != cls_name:
raise TypeError('%s constructor cannot be used to create instances of a subclass' % cls_name)
return info.invoke(cls, *args, **kwargs)
constructor.__info__ = info
constructor.__name__ = info.get_name()
constructor.__module__ = info.get_namespace()
return constructor
class MetaClassHelper(object):
def _setup_constructors(cls):
for method_info in cls.__info__.get_methods():
if method_info.is_constructor():
name = method_info.get_name()
constructor = classmethod(Constructor(method_info))
setattr(cls, name, constructor)
def _setup_methods(cls):
for method_info in cls.__info__.get_methods():
name = method_info.get_name()
function = Function(method_info)
if method_info.is_method():
method = function
elif method_info.is_constructor():
continue
else:
method = staticmethod(function)
setattr(cls, name, method)
def _setup_fields(cls):
for field_info in cls.__info__.get_fields():
name = field_info.get_name().replace('-', '_')
setattr(cls, name, property(field_info.get_value, field_info.set_value))
def _setup_constants(cls):
for constant_info in cls.__info__.get_constants():
name = constant_info.get_name()
value = constant_info.get_value()
setattr(cls, name, value)
def _setup_vfuncs(cls):
for vfunc_name, py_vfunc in cls.__dict__.items():
if not vfunc_name.startswith("do_") or not callable(py_vfunc):
continue
# If a method name starts with "do_" assume it is a vfunc, and search
# in the base classes for a method with the same name to override.
# Recursion is not necessary here because getattr() searches all
# super class attributes as well.
vfunc_info = None
for base in cls.__bases__:
method = getattr(base, vfunc_name, None)
if method is not None and hasattr(method, '__info__') and \
isinstance(method.__info__, VFuncInfo):
vfunc_info = method.__info__
break
# If we did not find a matching method name in the bases, we might
# be overriding an interface virtual method. Since interfaces do not
# provide implementations, there will be no method attribute installed
# on the object. Instead we have to search through
# InterfaceInfo.get_vfuncs(). Note that the infos returned by
# get_vfuncs() use the C vfunc name (ie. there is no "do_" prefix).
if vfunc_info is None:
vfunc_info = find_vfunc_info_in_interface(cls.__bases__, vfunc_name[len("do_"):])
if vfunc_info is not None:
assert vfunc_name == ('do_' + vfunc_info.get_name())
# Check to see if there are vfuncs with the same name in the bases.
# We have no way of specifying which one we are supposed to override.
ambiguous_base = find_vfunc_conflict_in_bases(vfunc_info, cls.__bases__)
if ambiguous_base is not None:
base_info = vfunc_info.get_container()
raise TypeError('Method %s() on class %s.%s is ambiguous '
'with methods in base classes %s.%s and %s.%s' %
(vfunc_name,
cls.__info__.get_namespace(),
cls.__info__.get_name(),
base_info.get_namespace(),
base_info.get_name(),
ambiguous_base.__info__.get_namespace(),
ambiguous_base.__info__.get_name()))
hook_up_vfunc_implementation(vfunc_info, cls.__gtype__,
py_vfunc)
def _setup_native_vfuncs(cls):
# Only InterfaceInfo and ObjectInfo have the get_vfuncs() method.
# We skip InterfaceInfo because interfaces have no implementations for vfuncs.
# Also check if __info__ in __dict__, not hasattr('__info__', ...)
# because we do not want to accidentally retrieve __info__ from a base class.
class_info = cls.__dict__.get('__info__')
if class_info is None or not isinstance(class_info, ObjectInfo):
return
for vfunc_info in class_info.get_vfuncs():
name = 'do_%s' % vfunc_info.get_name()
value = NativeVFunc(vfunc_info)
setattr(cls, name, value)
def find_vfunc_info_in_interface(bases, vfunc_name):
for base in bases:
# All wrapped interfaces inherit from GInterface.
# This can be seen in IntrospectionModule.__getattr__() in module.py.
# We do not need to search regular classes here, only wrapped interfaces.
# We also skip GInterface, because it is not wrapped and has no __info__ attr.
if base is _gobject.GInterface or\
not issubclass(base, _gobject.GInterface) or\
not isinstance(base.__info__, InterfaceInfo):
continue
for vfunc in base.__info__.get_vfuncs():
if vfunc.get_name() == vfunc_name:
return vfunc
vfunc = find_vfunc_info_in_interface(base.__bases__, vfunc_name)
if vfunc is not None:
return vfunc
return None
def find_vfunc_conflict_in_bases(vfunc, bases):
for klass in bases:
if not hasattr(klass, '__info__') or \
not hasattr(klass.__info__, 'get_vfuncs'):
continue
vfuncs = klass.__info__.get_vfuncs()
vfunc_name = vfunc.get_name()
for v in vfuncs:
if v.get_name() == vfunc_name and v != vfunc:
return klass
aklass = find_vfunc_conflict_in_bases(vfunc, klass.__bases__)
if aklass is not None:
return aklass
return None
class GObjectMeta(_gobject.GObjectMeta, MetaClassHelper):
def __init__(cls, name, bases, dict_):
super(GObjectMeta, cls).__init__(name, bases, dict_)
is_gi_defined = False
if cls.__module__ == 'gi.repository.' + cls.__info__.get_namespace():
is_gi_defined = True
is_python_defined = False
if not is_gi_defined and cls.__module__ != GObjectMeta.__module__:
is_python_defined = True
if is_python_defined:
cls._setup_vfuncs()
elif is_gi_defined:
cls._setup_methods()
cls._setup_constants()
cls._setup_native_vfuncs()
if isinstance(cls.__info__, ObjectInfo):
cls._setup_fields()
cls._setup_constructors()
elif isinstance(cls.__info__, InterfaceInfo):
register_interface_info(cls.__info__.get_g_type())
def mro(cls):
return mro(cls)
def mro(C):
"""Compute the class precedence list (mro) according to C3
Based on http://www.python.org/download/releases/2.3/mro/
Modified to consider that interfaces don't create the diamond problem
"""
# TODO: If this turns out being too slow, consider using generators
bases = []
bases_of_subclasses = [[C]]
if C.__bases__:
bases_of_subclasses += list(map(mro, C.__bases__)) + [list(C.__bases__)]
while bases_of_subclasses:
for subclass_bases in bases_of_subclasses:
candidate = subclass_bases[0]
not_head = [s for s in bases_of_subclasses if candidate in s[1:]]
if not_head and _gobject.GInterface not in candidate.__bases__:
candidate = None # conflict, reject candidate
else:
break
if candidate is None:
raise TypeError('Cannot create a consistent method resolution '
'order (MRO)')
bases.append(candidate)
for subclass_bases in bases_of_subclasses[:]: # remove candidate
if subclass_bases and subclass_bases[0] == candidate:
del subclass_bases[0]
if not subclass_bases:
bases_of_subclasses.remove(subclass_bases)
return bases
class StructMeta(type, MetaClassHelper):
def __init__(cls, name, bases, dict_):
super(StructMeta, cls).__init__(name, bases, dict_)
# Avoid touching anything else than the base class.
g_type = cls.__info__.get_g_type()
if g_type != _gobject.TYPE_INVALID and g_type.pytype is not None:
return
cls._setup_fields()
cls._setup_methods()
cls._setup_constructors()
for method_info in cls.__info__.get_methods():
if method_info.is_constructor() and \
method_info.get_name() == 'new' and \
not method_info.get_arguments():
cls.__new__ = staticmethod(Constructor(method_info))
break
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