# File lib/maruku/input/extensions.rb, line 31
  def self.register_span_extension(args)
    e = SpanExtension.new
    e.chars = [*args[:chars]]
    e.regexp = args[:regexp]
    e.block = args[:handler] || raise("No blocks passed")
    e.chars.each do |c|
      (SpanExtensionsTrigger[c] ||= []).push e
    end
  end