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: sml.rb
    path of file: ./repos/rouge/lib/rouge/lexers
    
    the code of the file until where you have to start completion: # -*- coding: utf-8 -*- #
# frozen_string_literal: true

m
    
      def self.keywords
        @keywords ||= Set.new %w(
          abstype and andalso as case datatype do else end exception
          fn fun handle if in infix infixr let local nonfix of op open
          orelse raise rec then type val with withtype while
          eqtype functor include sharing sig signature struct structure
          where
        )
      end

      def self.symbolic_reserved
        @symbolic_reserved ||= Set.new %w(: | = => -> # :>)
      end

      id = /[\w']+/i
      symbol = %r([!%&$#/:<=>?@\\~`^|*+-]+)

      state :whitespace do
        rule %r/\s+/m, Text
        rule %r/[(][*]/, Comment, :comment
      end

      state :delimiters do
        rule %r/[(\[{]/, Punctuation, :main
        rule %r/[)\]}]/, Punctuation, :pop!

        rule %r/\b(let|if|local)\b(?!')/ do
          token Keyword::Reserved
          push; push
        end

        rule %r/\b(struct|sig|while)\b(?!')/ do
          token Keyword::Reserved
          push
        end

        rule %r/\b(do|else|end|in|then)\b(?!')/, Keyword::Reserved, :pop!
      end

      def token_for_id_with_dot(id)
        if self.class.keywords.include? id
          Error
        else
          Name::Namespace
        end
      end