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: whitespace.rb
    path of file: ./repos/classifier-reborn/lib/classifier-reborn/extensions/tokenizer
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

# Author::    Lucas Carlson  (mailto:lucas@rufy.com)
# Copyright:: Copyright (c) 2005 Lucas Carlson
# License::   LGPL

require_relative 'token'

module ClassifierReborn
  module Tokenizer
    # This tokenizes given input as white-space separated terms.
    # It mainly aims to tok
    
      def call(str)
        tokens = str.gsub(/[^\p{WORD}\s]/, '').downcase.split.collect do |word|
          Token.new(word, stemmable: true, maybe_stopword: true)
        end
        symbol_tokens = str.scan(/[^\s\p{WORD}]/).collect do |word|
          Token.new(word, stemmable: false, maybe_stopword: false)
        end
        tokens += symbol_tokens
        tokens
      end