class Tryouts::Drill::Sergeant::API

def initialize(return_value=nil)
  @return_value = return_value
end

def run(block, context, &inline)
  
  # A Proc object takes precedence over an inline block. 
  runtime = (block.nil? ? inline : block)
  response = Tryouts::Drill::Reality.new
  if runtime.nil?
    response.output = @return_value
  else
    begin
      unless runtime.nil?
        ret = context.instance_eval &runtime
        response.output, response.rcode = ret, 0
      end
    rescue => ex
      response.rcode = 1
      response.output = ret
      response.emsg = ex.message
      response.backtrace = ex.backtrace
    end
  end
  response
end