Bitsy

A simple bitmask in ruby.

Installation

Add this line to your application's Gemfile:

gem 'bitsy'

And then execute:

$ bundle

Or install it yourself as:

$ gem install bitsy

Create a bit mask class:

class UserRoles < Bitsy
  flags :admin, :moderator, :author, :banned
end

Then use this class to track which flags are set.

user_roles = UserRoles.new
user_roles.has_admin? # false
user_roles << :admin
user_roles.has_admin? # true

You can check for roles with the generated methods, e.g.

user_roles.has_admin_and_moderator_and_author
user_roles.has_admin_or_author

You can also use the underlying methods every and some:

user_roles.every(:admin, :moderator, :author)
user_roles.some(:admin, :author)

Flags can be set, unset and toggled:

user_roles.set(:admin)
user_roles.unset(:author)
user_roles.toggle(:moderator)

user_roles << :banned

Masks are automatically created for the flags you specify:

UserRoles::ADMIN
UserRoles::MODERATOR
UserRoles::AUTHOR
UserRoles::BANNED

Each of these is a Bitsy::Mask. These can be used to manipulate the flags directly, e.g. to set the :banned flag we can do:

user_roles |= UserRoles::BANNED

Masks can be combined to form composite masks:

UserRoles::ADMIN_AND_AUTHOR = UserRoles::ADMIN | UserRoles::AUTHOR