activesupport/lib/active_support/dependencies/autoload.rb


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require "active_support/inflector/methods"
require "active_support/lazy_load_hooks"

module ActiveSupport
  module Autoload
    @@autoloads = {}
    @@under_path = nil
    @@at_path = nil
    @@eager_autoload = false

    def autoload(const_name, path = @@at_path)
      unless path
        full = [name, @@under_path, const_name.to_s, path].compact.join("::")
        path = Inflector.underscore(full)
      end

      if @@eager_autoload
        @@autoloads[const_name] = path
      end

      super const_name, path
    end

    def autoload_under(path)
      @@under_path, old_path = path, @@under_path
      yield
    ensure
      @@under_path = old_path
    end

    def autoload_at(path)
      @@at_path, old_path = path, @@at_path
      yield
    ensure
      @@at_path = old_path
    end

    def eager_autoload
      old_eager, @@eager_autoload = @@eager_autoload, true
      yield
    ensure
      @@eager_autoload = old_eager
    end

    def self.eager_autoload!
      @@autoloads.values.each { |file| require file }
    end

    def autoloads
      @@autoloads
    end
  end
end