class String
  def snake_case
    gsub("::", "/")
    gsub(/([A-Z]+)([A-Z][a-z])/, '\1_\2').
      gsub(/([a-z\d])([A-Z])/, '\1_\2').
      tr("-", "_").downcase
  end

  def camelcase
    return self if self !~ /_/ && self =~ /[A-Z]+.*/
    split("_").map(&:capitalize).join
  end
end