module Spec::Example::ExampleGroupFactory::ClassMethods

def [](key)
  @example_group_types[key]
end

def create_example_group(*args, &block)
  raise ArgumentError if args.empty?
  raise ArgumentError unless block
  superclass = determine_superclass(args.last)
  superclass.describe(*args, &block)
end

def create_shared_example_group(*args, &example_group_block) # :nodoc:
  ::Spec::Example::SharedExampleGroup.register(*args, &example_group_block)
end

def default(example_group_class)
  Spec.__send__ :remove_const, :ExampleGroup if Spec.const_defined?(:ExampleGroup)
  Spec.const_set(:ExampleGroup, example_group_class)
  old = @example_group_types
  @example_group_types = Hash.new(example_group_class)
  @example_group_types.merge!(old) if old
end

def determine_superclass(opts)
  if type = opts[:type]
    self[type]
  elsif opts[:location] =~ /spec(\\|\/)(#{@example_group_types.keys.sort_by{|k| k.to_s.length}.reverse.join('|')})/
    self[$2 == '' ? nil : $2.to_sym]
  else
    self[nil]
  end
end

def example_group_creation_listeners
  @example_group_creation_listeners ||= []
end

def register(key, example_group_class)
  @example_group_types[key.to_sym] = example_group_class
end

def register_example_group(klass)
  example_group_creation_listeners.each do |listener|
    listener.register_example_group(klass)
  end
end

def reset
  @example_group_types = nil
  default(ExampleGroup)
end