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Contents
# Copyright (c) 2008 Michael Fellinger m.fellinger@gmail.com
# All files in this distribution are subject to the terms of the Ruby license.
Traits = Hash.new{|h,k| h[k] = {}} unless defined?(Traits)
# Extensions for Object
class Object
# Adds a method to Object to annotate your objects with certain traits.
# It's basically a simple Hash that takes the current object as key
#
# Example:
#
# class Foo
# trait :instance => false
#
# def initialize
# trait :instance => true
# end
# end
#
# Foo.trait[:instance]
# # false
#
# foo = Foo.new
# foo.trait[:instance]
# # true
def trait hash = nil
if hash
Traits[self].merge! hash
else
Traits[self]
end
end
# builds a trait from all the ancestors, closer ancestors
# overwrite distant ancestors
#
# class Foo
# trait :one => :eins
# trait :first => :erstes
# end
#
# class Bar < Foo
# trait :two => :zwei
# end
#
# class Foobar < Bar
# trait :three => :drei
# trait :first => :overwritten
# end
#
# Foobar.ancestral_trait
# {:three=>:drei, :two=>:zwei, :one=>:eins, :first=>:overwritten}
def ancestral_trait
if respond_to?(:ancestors)
ancs = ancestors
else
ancs = self.class.ancestors
end
ancs.reverse.inject({}){|s,v| s.merge(v.trait)}.merge(trait)
end
# trait for self.class
def class_trait
if respond_to?(:ancestors)
trait
else
self.class.trait
end
end
end
Version data entries
22 entries across 22 versions & 5 rubygems