jumph4x/durable_decorator

module DurableDecorator
  # borrowed straight from Rails' ActiveSupport
  # https://github.com/rails/rails/blob/9e0b3fc7cfba43af55377488f991348e2de24515/activesupport/lib/active_support/inflector/methods.rb#L213
  class Constantizer
    if Module.method(:const_get).arity == 1
      # Tries to find a constant with the name specified in the argument string:
      #
      #   "Module".constantize     # => Module
      #   "Test::Unit".constantize # => Test::Unit
      #
      # The name is assumed to be the one of a top-level constant, no matter whether
      # it starts with "::" or not. No lexical context is taken into account:
      #
      #   C = 'outside'
      #   module M
      #     C = 'inside'
      #     C               # => 'inside'
      #     "C".constantize # => 'outside', same as ::C
      #   end
      #
      # NameError is raised when the name is not in CamelCase or the constant is
      # unknown.
      def self.constantize(camel_cased_word)
        names = camel_cased_word.split('::')
        names.shift if names.empty? || names.first.empty?

        constant = Object
        names.each do |name|
          constant = constant.const_defined?(name) ? constant.const_get(name) : constant.const_missing(name)
        end
        constant
      end
    else
      def self.constantize(camel_cased_word) #:nodoc:
        names = camel_cased_word.split('::')
        names.shift if names.empty? || names.first.empty?

        constant = Object
        names.each do |name|
          constant = constant.const_defined?(name, false) ? constant.const_get(name) : constant.const_missing(name)
        end
        constant
      end
    end
  end
end