You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: cvss.rb
    path of file: ./repos/dawnscanner/lib/cvss
    
    the code of the file until where you have to start completion: require 'cvss/parser'
require 'cvss/helpers'

module Cvss
  class Engine
    include Cvss::Parser
    include Cvss::Helpers

    def score(vector)
      # AV
      #   L = 0.395
      #   A = 0.646
      #   N = 1
      # AC
      #   H = 0.35
      #   M = 0.61
      #   L = 0.71
      # AU
      #   M = 0.45
      #   S = 0.56
      #   N = 0.704
      # C
      #
    
    def score(vector)
      # AV
      #   L = 0.395
      #   A = 0.646
      #   N = 1
      # AC
      #   H = 0.35
      #   M = 0.61
      #   L = 0.71
      # AU
      #   M = 0.45
      #   S = 0.56
      #   N = 0.704
      # C
      #   N = 0
      #   P = 0.275
      #   C = 0.660
      # I
      #   N = 0
      #   P = 0.275
      #   C = 0.660
      # A
      #   N = 0
      #   P = 0.275
      #   C = 0.660
      return -1 unless parse(vector)
      av = {:L => 0.395, :A=> 0.646, :N=>1}
      ac = {:H => 0.35, :M=>0.61, :L=>0.71}
      au = {:M=>0.45, :S=>0.56, :N=>0.704 }

      exploitability = 20 * av[@base[:av].to_sym] * ac[@base[:ac].to_sym] * au[@base[:au].to_sym]
      c = {:N=>0, :P=>0.275, :C=>0.660}
      i = {:N=>0, :P=>0.275, :C=>0.660}
      a = {:N=>0, :P=>0.275, :C=>0.660}

      impact = 10.41 * (1 - (1-c[@base[:c].to_sym]) * (1-i[@base[:i].to_sym]) * (1-a[@base[:a].to_sym]))
      f = 0
      f = 1.176 unless impact == 0

      (((0.6 * impact) + (0.4*exploitability) - 1.5) * f).round(1)

    end