Commit e39bb898 authored by Arnaud Fontaine's avatar Arnaud Fontaine

py3: Make metaclass work on both python2 and python3.

parent 3b290556
...@@ -566,6 +566,41 @@ else: ...@@ -566,6 +566,41 @@ else:
def unicode2str(s): def unicode2str(s):
return s return s
def with_metaclass(meta, *bases):
"""
Function from jinja2/_compat.py. License: BSD (copy/paste here for
ExtensionClass)
Use it like this::
class BaseForm(object):
pass
class FormType(type):
pass
class Form(with_metaclass(FormType, BaseForm)):
pass
This requires a bit of explanation: the basic idea is to make a
dummy metaclass for one level of class instantiation that replaces
itself with the actual metaclass. Because of internal type checks
we also need to make sure that we downgrade the custom metaclass
for one level to something closer to type (that's why __call__ and
__init__ comes back from type etc.).
This has the advantage over six.with_metaclass of not introducing
dummy classes into the final MRO.
"""
class metaclass(meta):
__call__ = type.__call__
__init__ = type.__init__
def __new__(cls, name, this_bases, d):
if this_bases is None:
import ExtensionClass
return ExtensionClass.ExtensionClass.__new__(cls, name, (), d)
return meta(name, bases, d)
return metaclass('temporary_class', None, {})
##################################################### #####################################################
# Globals initialization # Globals initialization
##################################################### #####################################################
......
...@@ -122,7 +122,8 @@ class RecordablePropertyMetaClass(ExtensionClass): ...@@ -122,7 +122,8 @@ class RecordablePropertyMetaClass(ExtensionClass):
# ghosting/unghosting Portal Types # ghosting/unghosting Portal Types
return ExtensionClass.__new__(ExtensionClass, name, bases, dictionary) return ExtensionClass.__new__(ExtensionClass, name, bases, dictionary)
class ComponentMixin(PropertyRecordableMixin, Base): from Products.ERP5Type.Utils import with_metaclass
class ComponentMixin(with_metaclass(RecordablePropertyMetaClass, type('NewBase', (PropertyRecordableMixin, Base), {}))):
""" """
Mixin used for all ZODB Components. Most of the code is generic, thus actual Mixin used for all ZODB Components. Most of the code is generic, thus actual
ZODB Components should have almost nothing to defined... ZODB Components should have almost nothing to defined...
...@@ -145,8 +146,6 @@ class ComponentMixin(PropertyRecordableMixin, Base): ...@@ -145,8 +146,6 @@ class ComponentMixin(PropertyRecordableMixin, Base):
state, checkConsistency() is called to check id, reference, version and state, checkConsistency() is called to check id, reference, version and
errors/warnings messages (set when the Component is modified). errors/warnings messages (set when the Component is modified).
""" """
__metaclass__ = RecordablePropertyMetaClass
isPortalContent = 1 isPortalContent = 1
isRADContent = 1 isRADContent = 1
isDelivery = ConstantGetter('isDelivery', value=True) isDelivery = ConstantGetter('isDelivery', value=True)
......
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