Factlink/pavlov

# Copyright (c) 2005-2011 David Heinemeier Hansson
#           (c) 2013 Factlink, Inc
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:

# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

# fork from active_support 3.2.14 : ActiveSuport::Concern
# Removed deprecation warning, and don't include InstanceMethods
#
# Including InstanceMethods conflicts with Virtus (which also uses InstanceMethods)

module Pavlov
  module Concern
    def self.extended(base)
      base.instance_variable_set('@_dependencies', [])
    end

    def append_features(base)
      if base.instance_variable_defined?('@_dependencies')
        base.instance_variable_get('@_dependencies') << self
        return false
      else
        return false if base < self
        @_dependencies.each { |dep| base.send(:include, dep) }
        super
        base.extend const_get('ClassMethods') if const_defined?('ClassMethods')
        base.class_eval(&@_included_block) if instance_variable_defined?('@_included_block')
      end
    end

    def included(base = nil, &block)
      if base.nil?
        @_included_block = block
      else
        super
      end
    end
  end
end