module Rack
  module When
    class Builder

      def initialize env, block
        @env, @block = env, block
      end

      def mount
        @block.call if has_matching_env?
      end

      def has_matching_env?
        (ENV['RACK_ENV'] || ENV['RAILS_ENV'] || 'development') =~ /^#{@env.to_s.downcase}/
      end

    end
  end
end