Method: Split::Configuration#normalize_alternatives

Defined in:

lib/split/configuration.rb

#normalize_alternatives(alternatives) ⇒ Object

# File 'lib/split/configuration.rb', line 179

def normalize_alternatives(alternatives)
  given_probability, num_with_probability = alternatives.inject([0, 0]) do |a, v|
    p, n = a
    if percent = value_for(v, :percent)
      [p + percent, n + 1]
    else
      a
    end
  end

  num_without_probability = alternatives.length - num_with_probability
  unassigned_probability = ((100.0 - given_probability) / num_without_probability / 100.0)

  if num_with_probability.nonzero?
    alternatives = alternatives.map do |v|
      if (name = value_for(v, :name)) && (percent = value_for(v, :percent))
        { name => percent / 100.0 }
      elsif name = value_for(v, :name)
        { name => unassigned_probability }
      else
        { v => unassigned_probability }
      end
    end

    [alternatives.shift, alternatives]
  else
    alternatives = alternatives.dup
    [alternatives.shift, alternatives]
  end
end