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Contents
# TITLE:
#
# Prepend
#
# DESCRIPTION:
#
# Presend a module to another module, or to a class.
#
# COPYRIGHT:
#
# Copyright (c) 2007 Thomas Sawyer
#
# LICENSE:
#
# Ruby License
#
# This module is free software. You may use, modify, and/or redistribute this
# software under the same terms as Ruby.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.
#
# AUTHORS:
#
# - Thomas Sawyer
#
class Module
# Prepend an +aspect+ module to a module.
#
# module X
# def x; "x"; end
# end
#
# module U
# def x; '{' + super + '}'; end
# end
#
# X.prepend U
#
# X.x # => "{x}"
def prepend( aspect )
aspect.send(:include, self)
extend aspect
end
end
#
class Class
# Prepend an +aspect+ module to a class.
#
# class Firetruck
# def put_out_fire(option)
# "Put out #{option}"
# end
# end
#
# module FastFiretruck
# def put_out_fire(option)
# super("very #{option}!")
# end
# end
#
# Firetruck.prepend(FastFiretruck)
#
# ft = Firetruck.new
# ft.put_out_fire('fast') #=> "Put out very fast!"
def prepend( aspect )
_new = method(:new)
_allocate = method(:allocate)
(class << self; self; end).class_eval do
define_method(:new) do |*args|
o = _new.call(*args)
o.extend aspect
o
end
define_method(:allocate) do |*args|
o = _allocate.call(*args)
o.extend aspect
o
end
end
end
end
Version data entries
13 entries across 13 versions & 1 rubygems