module DecisionMaker

Constants

VERSION

Public Class Methods

define(&definition) click to toggle source

# File lib/decision_maker.rb, line 36
def self.define(&definition)
  dsl = DSL.new
  dsl.instance_eval(&definition)
  d = dsl.definition
  ClassDefinition.customize(d.rule_table, d.name, d.condition_name, d.action_name, d.error_handler)
end

generate(&definition) click to toggle source

@example DecisionMaker.generate
  ticket_price = DecisionMaker.generate do
    rule(
      child:   { condition:  0..9,   action: 600 },
      student: { condition: 10..16,  action: 1200 },
      adult:   { condition: ->(age) { age > 16 }, action: 2000 },
    )
  end

  ticket_price.call(20) #=> 2000

@example Customizing names are available. It makes your code more illustrative

ticket_price = DecisionMaker.generate do
  name           :calculate
  condition_name :age
  action_name    :price

  rule(
    child:   { age:  0..9,   price: 600 },
    student: { age: 10..16,  price: 1200 },
    adult:   { age: ->(age) { age > 16 }, price: 2000 },
  )
end

ticket_price.calculate(20) #=> 2000

# File lib/decision_maker.rb, line 31
def self.generate(&definition)
  decision_table = define(&definition)
  decision_table.new
end