class Kramdown::Converter::Base

def format_math(el, opts = {})
  return nil unless @options[:math_engine]
  engine = ::Kramdown::Converter.math_engine(@options[:math_engine])
  if engine
    engine.call(self, el, opts)
  else
    warning("The configured math engine #{@options[:math_engine]} is not available.")
    nil
  end
end