class Nokogiri::EncodingHandler

def [](name)
  storage.key?(name) ? new(storage[name]) : nil
end

def alias(name, alias_name)
  storage[alias_name] = name
end

def clear_aliases!
  storage.clear
end

def delete(name)
  storage.delete(name)
end

def initialize(name)
  @name = name
end

def install_default_aliases
  USEFUL_ALIASES.each do |alias_name, name|
    EncodingHandler.alias(name, alias_name) if EncodingHandler[alias_name].nil?
  end
end

def storage
  @storage ||= {}
end