def __init__(aspect, name, bases, dct):
"""Will be called when a aspect class is created
Parse the aspects dictionary and generate instructions from it.
Undecorated attributes are understood as finalize instructions.
>>> class P(Aspect):
... a = Instruction(1)
... b = 2
>>> Instructions(P)
[('a', <class 'metachao._instructions.Instruction'>, 1),
('b', <class 'metachao._instructions.overwrite'>, 2)]
"""
super(AspectMeta, aspect).__init__(name, bases, dct)
# Get the aspect's instructions list
instructions = Instructions(aspect)
# walk the mro, w/o object, gathering/creating instructions
for cls in getmro(aspect)[:-1]:
for name, item in cls.__dict__.iteritems():
# ignored attributes
if name.startswith('__metachao_'):
continue
if name in (
'__implemented__', '__metaclass__',
'__provides__', '__providedBy__',
): continue
if name in DICT_KEYS_OF_PLAIN_CLASS:
continue
if name in instructions:
continue
# XXX: rethink this
# undecorated items are understood as overwrite
if not isinstance(item, Instruction):
item = overwrite(item)
item.__name__ = name
item.__parent__ = aspect
instructions.append(item)
def __init__(aspect, name, bases, dct):
"""Will be called when a aspect class is created
Parse the aspects dictionary and generate instructions from it.
Undecorated attributes are understood as finalize instructions.
>>> class P(Aspect):
... a = Instruction(1)
... b = 2
>>> Instructions(P)
[('a', <class 'metachao._instructions.Instruction'>, 1),
('b', <class 'metachao._instructions.overwrite'>, 2)]
"""
super(AspectMeta, aspect).__init__(name, bases, dct)
# Get the aspect's instructions list
instructions = Instructions(aspect)
# walk the mro, w/o object, gathering/creating instructions
# XXX: not sure whether that is good
for cls in getmro(aspect)[:-1]:
for name, item in cls.__dict__.iteritems():
# ignored attributes
if name.startswith('_abc_'):
continue
if name == '__abstractmethods__':
continue
if name.startswith('__metachao_'):
continue
if name in (
'__implemented__', '__metaclass__',
'__provides__', '__providedBy__',
): continue
if name in DICT_KEYS_OF_PLAIN_CLASS:
continue
if name in instructions:
continue
# XXX: rethink this
# undecorated items are understood as overwrite
if not isinstance(item, Instruction):
item = overwrite(item)
item.__name__ = name
item.__parent__ = aspect
instructions.append(item)
# for (every) aspectkw we need to plumb __init__
aspectkws = dict([(x.key, x) for x in instructions
if isinstance(x, aspectkw)])
if aspectkws:
@plumb
def __init__(_next, self, *args, **kw):
for k in kw.keys():
if k not in aspectkws:
continue
value = kw.pop(k)
akw = aspectkws[k]
if value is not akw.item:
setattr(self, akw.name, value)
_next(*args, **kw)
__init__.__name__ = '__init__'
__init__.__parent__ = aspect
instructions.append(__init__)
def parse_aspect(aspect):
config = dict()
instructions = dict()
seen = list()
children = dict()
# walk the mro, w/o object, gathering/creating instructions
# XXX: not sure whether that is good
# XXX: why doesn't getmembers do the job?
for cls in getmro(aspect)[:-1]:
for name, item in cls.__dict__.iteritems():
# ignored attributes
if name.startswith('_abc_'):
continue
if name == '__abstractmethods__':
continue
if name.startswith('__metachao_'):
continue
if name in (
'__implemented__', '__metaclass__',
'__provides__', '__providedBy__',
):
continue
if name in DICT_KEYS_OF_PLAIN_CLASS:
continue
if name in seen:
continue
seen.append(name)
if isinstance(item, child_instruction):
key = getattr(item, 'key', name)
children[key] = item
continue
# undecorated items are understood as overwrite
if isinstance(item, Instruction):
instruction = item
else:
instruction = overwrite(item)
instruction.name = name
instruction.parent = cls
instructions[name] = instruction
if isinstance(instruction, config_instruction):
config[instruction.key] = instruction
if children:
for name, instr in child_instruction.instructions(
aspect, children).items():
if name in instructions:
instr = instr.compose(instructions[name])
instructions[name] = instr
aspectkws = config
if aspectkws:
@plumb
def __init__(_next, self, *args, **kw):
for k in kw.keys():
if k not in aspectkws:
continue
value = kw.pop(k)
akw = aspectkws[k]
if value is not akw.item:
setattr(self, akw.name, value)
_next(*args, **kw)
__init__.name = '__init__'
__init__.parent = aspect
if '__init__' in instructions:
__init__ = __init__.compose(instructions['__init__'])
instructions['__init__'] = __init__
return (config, instructions)
