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: custom_tag.rb
    path of file: ./repos/lookbook/lib/lookbook/tags
    
    the code of the file until where you have to start completion: module Lookbook
  
    
    def parse_tag
      text_tokens = Shellwords.split(text)
      values = text_tokens.slice(0, arg_names.size)

      arg_names.map.with_index do |name, i|
        [name.to_sym, values[i]]
      end.to_h
    end

    def validate_arg_names
      arg_names.each do |name|
        if methods.include? name.to_sym
          raise ParserError.new "'#{name}' is a reserved word and cannot be used as an argument name."
        end
      end
    end