BitMask

A simple class that allows you to store data in a bit mask. It automagically manages bit sizes and base conversion of binary bitmask.

Usage

When writing these config maps. Try to put the mose used options first so the string can be shorter.

require 'rubygems'
require 'bit_mask'
class SearchParams < BitMask

  # first set base defaults is 62
  # Integer up to 62
  set_base 62

  field :air, :values => 2    # number of options must be 2 or greater
  field :color, :values => ['blue','green','red']  # bit_mask can map arrays of data, the default setting will be the first value in the array
  field :body_style,  :values => [:sedan,:mini_van,:suv]  # Array values can be anything that can be found using the Array#index function
  field :transmission,:values => 6
  field :min_price, :values => (50..100).to_a # ( just a way to store ranges of numbers)
  field :max_price, :values => (1..5).to_a.map {|n| 10000+(n*20)}

  # overwrite default accessors

  def body_style=(value)
    self.write_attribute(:body_style,value).to_sym
  end

  def body_style
    self.read_attribute(:body_style).to_s
  end

end

# initialize
@search = SearchParams.new

# set a single value
@search[:color]='red'
@search.color = 'red'

# get a single value
@search.color # the same as @search[:color]

# replace values in config with another hash
@search.replace({:air=>1})

# convert to small compact string
@search.to_s
@search.to_s(36) # choose base different from default
@search.to_s('asldkfjv') # use custom character sets for encoding
@search.dump

# load
SearchParams.load(@search.dump)
SearchParams.load(@search.to_s(36),36) # load from different base
SearchParams.load(@search.to_s('asldkfjv'),'asldkfjv')

TODO

• Impliment more tests
• Storage of strings?
• create javascript version for easy communication between ruby and javascript

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request

Credits

Ryan Ong - ryanong@gmail.com

Copyright

Copyright (c) 2021 Ryan Ong. See LICENSE.txt for further details.