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require 'active_support/core_ext/array/extract_options'
class Module
def mattr_reader(*syms)
options = syms.extract_options!
syms.each do |sym|
raise NameError.new('invalid attribute name') unless sym =~ /^[_A-Za-z]\w*$/
class_eval(<<-EOS, __FILE__, __LINE__ + 1)
@@#{sym} = nil unless defined? @@#{sym}
def self.#{sym}
@@#{sym}
end
EOS
unless options[:instance_reader] == false || options[:instance_accessor] == false
class_eval(<<-EOS, __FILE__, __LINE__ + 1)
def #{sym}
@@#{sym}
end
EOS
end
end
end
def mattr_writer(*syms)
options = syms.extract_options!
syms.each do |sym|
raise NameError.new('invalid attribute name') unless sym =~ /^[_A-Za-z]\w*$/
class_eval(<<-EOS, __FILE__, __LINE__ + 1)
def self.#{sym}=(obj)
@@#{sym} = obj
end
EOS
unless options[:instance_writer] == false || options[:instance_accessor] == false
class_eval(<<-EOS, __FILE__, __LINE__ + 1)
def #{sym}=(obj)
@@#{sym} = obj
end
EOS
end
end
end
# Extends the module object with module and instance accessors for class attributes,
# just like the native attr* accessors for instance attributes.
#
# module AppConfiguration
# mattr_accessor :google_api_key
#
# self.google_api_key = "123456789"
# end
#
# AppConfiguration.google_api_key # => "123456789"
# AppConfiguration.google_api_key = "overriding the api key!"
# AppConfiguration.google_api_key # => "overriding the api key!"
#
# To opt out of the instance writer method, pass <tt>instance_writer: false</tt>.
# To opt out of the instance reader method, pass <tt>instance_reader: false</tt>.
# To opt out of both instance methods, pass <tt>instance_accessor: false</tt>.
def mattr_accessor(*syms)
mattr_reader(*syms)
mattr_writer(*syms)
end
end
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