def _createChildListProperties(cls, name, bases, dict):
"""
Introspect the class being created to look for class members which
contain 'declarative' [Node] objects. Move these declarations into the
child_infos class member, and create getters, setters and properties
to provide access to each of the child members.
"""
list_infos = {}
for info_name, v in dict.items():
if isinstance(v, list) and isinstance(v[0], Node):
list_infos[info_name] = v
removal = []
for info_name in list_infos.keys():
property_name = underscoresToCamelCase(info_name)
if info_name != property_name:
removal.append(info_name)
def _getProperty(self, info_name=info_name):
return self._children[info_name]
def _setProperty(self, value, info_name=info_name):
self._children[info_name] = value
if not hasprop(cls, property_name):
setattr(cls, property_name, property(_getProperty, _setProperty))
for info_name in removal:
delattr(cls, info_name)
cls.child_infos.update(list_infos)
def __call__(cls, *args, **kwargs):
"""
Called when instances of classes with this metaclass. i.e. AstNodes.
Consume keyword arguments with the same name as child properties and options then
set the appropriate attributes.
"""
# First create the object
obj = type.__call__(cls, *args)
for kwarg in kwargs:
if hasprop(cls, kwarg):
setattr(obj, kwarg, kwargs[kwarg])
else:
raise AttributeError("No such property initialiser as '%s' on '%s'" % (kwarg, cls.__name__))
# TODO: Should remove consumed kwargs here
return obj
