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@DanHulton
Forked from hashmal/gist:803816
Created May 26, 2011 15:58
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Playing with CoffeeScript, do funny things with mixins.
# Swappable Mixins in CoffeeScript
# ================================
# Many thanks to Hashmal, who wrote this to start.
# https://gist.github.com/803816/aceed8fc57188c3a19ce2eccdb25acb64f2be94e
# Usage
# -----
# class Derp extends Mixin
# setup: ->
# @googly = "eyes"
# derp: ->
# alert "Herp derp! What's with your #{ @googly }?"
# class Herp
# constructor: ->
# Derp::augment this
# herp = new Herp
# herp.derp()
# Mixin
# -----
# Classes inheriting `Mixin` will become removable mixins, enabling you to
# swap them around.
class Mixin
# "Class method". Augment object or class `t` with new methods.
augment: (t) ->
(t[n] = m unless n == 'augment' or !this[n].prototype?) for n, m of this
t.setup()
# When an object is augmented with at least one mixin, call this method to
# remove `mixin`.
eject: (mixin) ->
(delete this[n] if m in (p for o, p of mixin::)) for n, m of this
# Implement in your mixin to act as a constructor for mixed-in properties
setup: ->
# Limitations
# -----------
# * When a class is augmented, all instances of that class are augmented too,
# and when a mixin is ejected from a class, all instances lose that mixin
# too.
# * You can't eject a mixin from an object if that mixin was added to the
# object's class. Eject the mixin from the class instead.
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