module Assert; end
class Assert::Context

  module SubjectDSL

    # Add a piece of description text or return the full description for the context
    def description(text = nil)
      if text
        self.descriptions << text.to_s
      else
        parent = self.superclass.desc if self.superclass.respond_to?(:desc)
        own = self.descriptions
        [parent, *own].compact.reject(&:empty?).join(" ")
      end
    end
    alias_method :desc, :description
    alias_method :describe, :description

    def subject(&block)
      if block_given?
        @subject = block
      else
        @subject || if superclass.respond_to?(:subject)
          superclass.subject
        end
      end
    end

    protected

    def descriptions
      @descriptions ||= []
    end

  end

end