Class: RuleChooser

Inherits:
Object
  • Object
show all
Defined in:
lib/grammoire/rule_chooser.rb

Instance Method Summary collapse

Constructor Details

#initialize(random_generator = RandomGenerator.new) ⇒ RuleChooser

Returns a new instance of RuleChooser.



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# File 'lib/grammoire/rule_chooser.rb', line 3

def initialize(random_generator = RandomGenerator.new)
  @random_generator = random_generator
end

Instance Method Details

#select_from(rules) ⇒ Object 



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# File 'lib/grammoire/rule_chooser.rb', line 7

def select_from(rules)
  return nil if rules.empty?

  selected_weight_index = @random_generator.number_up_to(total_weight_from(rules))
  max_weight_index = 0

  rules.each do |rule|
    max_weight_index += rule.weight
    return rule if selected_weight_index < max_weight_index
  end
end