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: polar.rb
    path of file: ./repos/oso/languages/ruby/lib/oso/polar
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

# Missing Ruby type.
module PolarBoolean; end
# Monkey-patch Ruby true type.
class
    
      def process_line(buf) # rubocop:disable Metrics/MethodLength, Metrics/PerceivedComplexity, Metrics/AbcSize
        query = buf.chomp.chomp(';')
        begin
          ffi_query = ffi_polar.new_query_from_str(query)
        rescue ParseError => e
          print_error(e)
          return
        end