diff options
Diffstat (limited to 'attoconf/classy.py')
| -rw-r--r-- | attoconf/classy.py | 35 |
1 files changed, 22 insertions, 13 deletions
diff --git a/attoconf/classy.py b/attoconf/classy.py index a27230d..98d54aa 100644 --- a/attoconf/classy.py +++ b/attoconf/classy.py @@ -1,4 +1,4 @@ -# Copyright 2013 Ben Longbons <b.r.longbons@gmail.com> +# Copyright 2013-2014 Ben Longbons <b.r.longbons@gmail.com> # # This file is part of attoconf. # @@ -19,24 +19,33 @@ from __future__ import print_function, division, absolute_import from .core import Project, Build -# TODO: put this in a metaclass -# some of the init/jiggle logic would also be simplified by a metaclass +class PolymorphicSlotMergerMetaclass(type): + + def __new__(meta, name, bases, dct): + if '__slots__' not in dct: + s = () + for b in bases: + s2 = b.__dict__.get('_merge_slots_', ()) + if isinstance(s2, basestring): + s2 = (s2,) + s += s2 + s += dct.get('_merge_slots_', ()) + dct['__slots__'] = s + else: + assert dct['__slots__'] == () + return type.__new__(meta, name, bases, dct) + + +# TODO: remove this for 1.0 def add_slots(cls): - ''' A decorator that fixes __slots__ after multiple inheritance. - ''' - return type(cls.__name__, cls.__bases__, - dict(cls.__dict__, __slots__=cls.slots())) + return cls class ClassyProject(Project): ''' A more convenient, objectish, way of setting up a project. ''' __slots__ = () - @classmethod - def slots(self): - ''' slots don't work too well with multiple inheritance, - so make the most-derived class create all the slots - ''' - return () + _merge_slots_ = () + __metaclass__ = PolymorphicSlotMergerMetaclass def __init__(self, srcdir): super(ClassyProject, self).__init__(srcdir) |