69 lines
2.1 KiB
Ruby
69 lines
2.1 KiB
Ruby
|
module Parfait
|
||
|
|
|
||
|
|
# class that acts like a class, but is really the object
|
||
|
|
|
||
|
|
# described in the ruby language book as the eigenclass, what you get with
|
||
|
|
# class MyClass
|
||
|
|
# class << self <--- this is called the eigenclass, or metaclass, and really is just
|
||
|
|
# .... the class object but gives us the ability to use the
|
||
|
|
# syntax as if it were a class
|
||
|
|
|
||
|
|
# While the "real" metaclass is the layout, we need to honor the constancy of the layout
|
||
|
|
# So the layout needs to be copied and replaced anytime it is edited.
|
||
|
|
# And then changed in the original object, and thus we need this level of indirection
|
||
|
|
|
||
|
|
# Basically we implement the Behaviour protocol, by forwarding to the layout
|
||
|
|
|
||
|
|
class MetaClass < Object
|
||
|
|
include Logging
|
||
|
|
|
||
|
|
attribute :object
|
||
|
|
|
||
|
|
def initialize(object)
|
||
|
|
super()
|
||
|
|
self.object = object
|
||
|
|
end
|
||
|
|
|
||
|
|
def name
|
||
|
|
self.object.get_layout.name
|
||
|
|
end
|
||
|
|
# first part of the protocol is read, just forward to self.object.layout
|
||
|
|
def methods
|
||
|
|
self.object.get_layout.methods
|
||
|
|
end
|
||
|
|
def method_names
|
||
|
|
self.object.get_layout.method_names
|
||
|
|
end
|
||
|
|
def get_instance_method fname
|
||
|
|
self.object.get_layout.get_instance_method fname
|
||
|
|
end
|
||
|
|
def resolve_method m_name
|
||
|
|
self.object.get_layout.resolve_method m_name
|
||
|
|
end
|
||
|
|
|
||
|
|
# the modifying part creates a new layout
|
||
|
|
# forwards the action and replaces the layout
|
||
|
|
def add_instance_method method
|
||
|
|
layout = self.object.get_layout.dup
|
||
|
|
ret = layout.add_instance_method(method)
|
||
|
|
self.object.set_layout layout
|
||
|
|
ret
|
||
|
|
end
|
||
|
|
|
||
|
|
def remove_instance_method method_name
|
||
|
|
layout = self.object.get_layout.dup
|
||
|
|
ret = layout.remove_instance_method(method_name)
|
||
|
|
self.object.set_layout layout
|
||
|
|
ret
|
||
|
|
end
|
||
|
|
|
||
|
|
def create_instance_method method_name , arguments
|
||
|
|
raise "create_instance_method #{method_name}.#{method_name.class}" unless method_name.is_a?(Symbol)
|
||
|
|
log.debug "Add_method: #{method_name} clazz: #{self.name}"
|
||
|
|
add_instance_method Method.new( self , method_name , arguments )
|
||
|
|
end
|
||
|
|
|
||
|
|
|
||
|
|
end
|
||
|
|
end
|