Coffeescript Magic

magic.coffee

#
# Magic
#
# Dependency injection via prototype.
#
#
# Get all methods and properties in the prototype chain
#
metadata = (klass) ->

  chain = []
  props = {}
  proto = klass:: # starting point in the chain

  # Build an inheritance list
  until proto is Object::
    chain.push proto
    proto = Object.getPrototypeOf(proto)

  # Reverse list to process overrides in the correct order
  for proto in chain.reverse()
    if proto isnt Object::
      # Build the inherited properties table
      for key in Object.getOwnPropertyNames(proto)
        props[key] = Object.getOwnPropertyDescriptor(proto, key)

  props

magic = (parent, klass, args...) ->

  # clone the object with all properties
  child = Object.create(parent, metadata(klass))
  # call the constructor
  klass.apply child, args
  child

#
# Main Controller Class
#
class Controller

  constructor: ->
    @date = new Date()
    @user = magic(@, Model, 'Zaphod')

  println: (msg) ->
    console.log msg

#
#
#
class Model

  constructor: (name) ->
    @name = name

  hello: () ->
    @println @name + " " + @date

#
# Create the applications main controller
#
controller = new Controller()
#
# Call the models hello method.
# Missing methods and properties fallback to the controller.
#
controller.user.hello()