vendor/rails/activesupport/lib/active_support/core_ext/module/attr_internal.rb

   1 class Module
   2   # Declares an attribute reader backed by an internally-named instance variable.
   3   def attr_internal_reader(*attrs)
   4     attrs.each do |attr|
   5       module_eval "def #{attr}() #{attr_internal_ivar_name(attr)} end"
   6     end
   7   end
   8
   9   # Declares an attribute writer backed by an internally-named instance variable.
  10   def attr_internal_writer(*attrs)
  11     attrs.each do |attr|
  12       module_eval "def #{attr}=(v) #{attr_internal_ivar_name(attr)} = v end"
  13     end
  14   end
  15
  16   # Declares an attribute reader and writer backed by an internally-named instance
  17   # variable.
  18   def attr_internal_accessor(*attrs)
  19     attr_internal_reader(*attrs)
  20     attr_internal_writer(*attrs)
  21   end
  22
  23   alias_method :attr_internal, :attr_internal_accessor
  24
  25   private
  26     mattr_accessor :attr_internal_naming_format
  27     self.attr_internal_naming_format = '@_%s'
  28
  29     def attr_internal_ivar_name(attr)
  30       attr_internal_naming_format % attr
  31     end
  32 end