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: parser.rb
    path of file: ./repos/lurker/lib/lurker/json
    
    the code of the file until where you have to start completion: module Lurker
  module Json
    class Parser
      class << self
        def plain(options = {})
          new(options).pla
    
      def parse_once(&block)
        raise 'Define parsing strategy [plain|typed] before using' unless @strategy.present?

        result = block.call
        @strategy = nil

        result
      end