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require 'active_support/core_ext/object/blank'
require 'active_support/core_ext/array/extract_options'
class Class
def superclass_delegating_reader(*names)
class_to_stop_searching_on = superclass.name.blank? ? "Object" : superclass.name
options = names.extract_options!
names.each do |name|
# def self.only_reader
# if defined?(@only_reader)
# @only_reader
# elsif superclass < Object && superclass.respond_to?(:only_reader)
# superclass.only_reader
# end
# end
class_eval <<-EOS, __FILE__, __LINE__ + 1
def self.#{name}
if defined?(@#{name})
@#{name}
elsif superclass < #{class_to_stop_searching_on} && superclass.respond_to?(:#{name})
superclass.#{name}
end
end
EOS
unless options[:instance_reader] == false
class_eval <<-EOS, __FILE__, __LINE__ + 1
def #{name} # def only_reader
self.class.#{name} # self.class.only_reader
end # end
def self.#{name}? # def self.only_reader?
!!#{name} # !!only_reader
end # end
def #{name}? # def only_reader?
!!#{name} # !!only_reader
end # end
EOS
end
end
end
def superclass_delegating_writer(*names, &block)
options = names.extract_options!
names.each do |name|
class_eval <<-EOS, __FILE__, __LINE__ + 1
def self.#{name}=(value) # def self.property=(value)
@#{name} = value # @property = value
end # end
EOS
self.send(:"#{name}=", yield) if block_given?
end
end
# These class attributes behave something like the class
# inheritable accessors. But instead of copying the hash over at
# the time the subclass is first defined, the accessors simply
# delegate to their superclass unless they have been given a
# specific value. This stops the strange situation where values
# set after class definition don't get applied to subclasses.
def superclass_delegating_accessor(*names, &block)
superclass_delegating_reader(*names)
superclass_delegating_writer(*names, &block)
end
end
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