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: pixiv.rb
    path of file: ./repos/e621ng/app/logical/sources/alternates
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Sources
  module Alternates
    class Pixiv < Base
      MONIKER = %r!(?:[a-zA-Z0-9_-]+)!
      PROFILE = %r!\Ahttps?://www\.pixiv\.net/member\.php\?id=[0-9]+\z!
      DATE = %r!(?<date>\d{4}/\d{2}/\d{2}/\d{2}/\d{2}/\d{2})!i
      EXT = %r!(?:jpg|jpeg|png|gif)!i

      def force_https?
        true
      end

      def domains
        ["pixiv.net", "pximg.net"]
      end

      def parse
        id = illust_id
        if id
          @su
    
      def remove_duplicates(sources)
        our_illust_id = illust_id
        return sources unless our_illust_id
        sources.delete_if do |source|
          url = Addressable::URI.heuristic_parse(source) rescue nil
          next false if url.nil?
          if url.host == "www.pixiv.net" && url.path == "/member_illust.php" && url.query_values.present? && url.query_values["illust_id"].present?
            next true if url.query_values["illust_id"].to_i == our_illust_id
          elsif url.host == "www.pixiv.net" && url.path =~ %r!\A/i/(?<illust_id>\d+)\z!i
            next true if $~[:illust_id].to_i == our_illust_id
          elsif url.host == "www.pixiv.net" && url.path =~ %r!\A/en/artworks/(?<illust_id>\d+)\z!i
            next true if $~[:illust_id].to_i == our_illust_id
          end
          false
        end