Sha256: 2c600d0c08007059e7362ba46e2934838033a74b430883e00094110736fca261
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Versions: 12
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Contents
# -*- coding: UTF-8 -*-
# A mixin that implements inheriting values from a parent module. The parent object can be set in
# two ways.
#
# object.parent = parent
# object.parent = lambda { some_function_returning_parent() }
#
# Set the inherited values with
#
# class MyClass
#
# include GetValuesFromParent
#
# inheritated_attr_accessor :myattr
# inheritated_attr_accessor :myotherattr.
#
# end
module MJ module Mixins
module InheritedAttributes
# Class methods
module ClassMethods
def inherited_attr_accessor( name )
class_eval <<-EOF
attr_writer :#{name}
def #{name}
return @#{name} if @#{name}
return parent.#{name} if @parent
return nil
end
EOF
end
end
# Instance methods
module InstanceMethods
def initialize( *args )
@parent = nil
end
# Set the parent object.
attr_writer :parent
# Get the parent object.
def parent
return nil if not @parent
if @parent.is_a?( Proc )
@parent.call()
else
@parent
end
end
end
# Include
def self.included( receiver )
receiver.extend ClassMethods
receiver.send :include, InstanceMethods
end
end # module InheritedAttributes
end end # module MJ::InheritedAttributes
Version data entries
12 entries across 12 versions & 1 rubygems