gistfile1.rbx

require "rubygems"
require "rack"
require "delegate"

module Sinatra

  class Builder < Rack::Builder
    Fall = 99

    class EventContext < DelegateClass(Hash)

      attr_reader :request, :response

      def initialize(env)
        @request  = Rack::Request.new(env)
        @response = Rack::Response.new
        super(env)
      end

      def fall
        response.status = Fall
        self.body
      end

      def method_missing(s, *args, &blk)
        @response.send(s, *args, &blk)
      end
    end

    attr_reader :context

    def initialize(&blk)
      @cascade = Rack::Cascade.new([], Fall)
      super(&blk)
      run @cascade
    end

    def raw_filter(&blk)
      @cascade << blk
    end

    def filter(&blk)
      raw_filter do |cx|
        cx.status = 200 if cx.status == Fall
        cx.body   = cx.instance_eval(&blk)
        cx.finish
      end
    end

    def get(match_path, &blk)
      filter do
        if match_path == request.path_info
          instance_eval(&blk)
        else
          fall
        end
      end
    end

    def map2(path = '*', &blk)
      instance_eval(&blk)
    end
    alias :group :map2

    def call(env)
      status, *_ = *super(EventContext.new(env))
      [status == Fall ? 404 : status, *_]
    end
  end
end

## ~ 3200 req/sec
# R = Rack::Builder.new do
# 
#   app1 = lambda { |env|
#     req = Rack::Request.new(env)
#     res = Rack::Response.new
#     if req.path_info == '/'
#       res.body = 'rack'
#       res.finish
#     else
#       res.status = 404
#       res.body   = ''
#       res.finish
#     end
#   }
# 
#   run Rack::Cascade.new([app1])
# 
# end

## ~ 2200 req/sec

class MW

end

R = Sinatra::Builder.new do

  use Rack::CommonLogger

  get '/bar' do
    'rack'
  end

end

R.get '/foo' do
  'foobar!'
end

if $0 == __FILE__
  require File.dirname(__FILE__) + "/helper"
  p R.call(Rack::MockRequest.env_for('/'))
end