问方法应该在类内吗？在Ruby中

EN

require_relative 'family'
require_relative 'family_tree'
include FamilyTree
require_relative 'constants'
require_relative 'errors'


def is_valid_input(command)
  #User input Validation
  commands = command.split(' ')
  return false unless (commands && INPUT_FUNCTION_MAPPER.key?(commands[0]))
  return false if (commands[0] == "ADD_CHILD" && commands.length != 4)
  return true
end

def create_family_tree(family_tree)
  #Initializing the family
  family_name = family_tree[:name]
  members = family_tree[:members]

  family = Family.new(family_name)
  members.each do |name, gender, mother_name|
    family.add_member(name, gender, mother_name)
  end
  family
end

def execute_command(command, family)
  result = nil
  unless is_valid_input(command)
    raise InvalidParametersError, "Command is not valid"
  end
  command = command.split(" ")
  if command[0] == "ADD_CHILD"
    mother, name, gender = command[1..]
    result = family.add_member(name, gender, mother)
  end
  result
end

def main_method
  if ARGV.length != 1
    raise InvalidParametersError, "Please provide an input file"
  end
  input_file = ARGV[0]
  unless File.file?(input_file)
    raise InvalidParametersError, "Input file does not exist"
  end

  family = create_family_tree(FAMILYTREE)
  File.readlines(input_file).each do |line|
    line = line.strip
    puts execute_command(line, family)
  end
end

main_method()

ruby main_file.rb input.txt