Sinatra源码学习【下】

def call(env) 
  dup.call!(env)
end
def call!(env) 
  # :nodoc:
  @env = env
  @request = Request.new(env)
  @response = Response.new
  @params = indifferent_params(@request.params) 
  template_cache.clear if settings.reload_templates force_encoding(@params)
  @response['Content-Type'] = nil
  invoke { dispatch! }
  invoke { error_block!(response.status) } unless @env['sinatra.error']
  unless @response['Content-Type']
    if Array === body and body[0].respond_to? :content_type
      content_type body[0].content_type 
    else
       content_type :html 
    end
  end
  @response.finish 
end

@env = env
@request = Request.new(env)
@response = Response.new
@params = indifferent_params(@request.params)

invoke { dispatch! }

def dispatch! 
  invoke do
    static! if settings.static? && (request.get? || request.head?) 
    filter! :before
    route!
  end
  rescue ::Exception => boom
    invoke { handle_exception!(boom) } 
  ensure
    begin
      filter! :after unless env['sinatra.static_file']
    rescue ::Exception => boom
      invoke { handle_exception!(boom) } unless @env['sinatra.error']
    end 
end

def route!(base = settings, pass_block = nil)
  if routes = base.routes[@request.request_method]
    routes.each do |pattern, keys, conditions, block|
      returned_pass_block = process_route(pattern, keys, conditions) do |*args|
        env['sinatra.route'] = block.instance_variable_get(:@route_name)
        route_eval { block[*args] } 
      end
      # don't wipe out pass_block in superclass
      pass_block = returned_pass_block if returned_pass_block 
    end
  end
  # Run routes defined in superclass.
  if base.superclass.respond_to?(:routes)
    return route!(base.superclass, pass_block) 
  end
  route_eval(&pass_block) if pass_block
  route_missing 
end

{‘GET’ => [[pattern, keys, conditions, block], [pattern, keys, conditions, block]......], ‘POST’ => [......]}

routes.each do |pattern, keys, conditions, block|
  returned_pass_block = process_route(pattern, keys, conditions) do |*args|
    env['sinatra.route'] = block.instance_variable_get(:@route_name)
    route_eval { block[*args] } 
  end
  ......
end