README.md

Get me a pizza (using DSL)

How to make a pizza without DSL

• Interface Pizza The Pizza interface defines basic properties of a pizza.

    interface Pizza {
        //...
    }
    
    //Provides description of a pizza
    fun Pizza.description() : String {
        //...
    }

• A simple Farm House pizza can be created using class FarmHouse.

    class FarmHouse : Pizza {
       //...
    }
 
    val pizza = FarmHouse()

    println(pizza.description()) //Prints ..
    //A Farm House pizza with Regular base, topped with Onion, Tomato, Mushroom and priced at 200.0

• A simple pizza can be customized using decorators.
  1. To use different base for any pizza, wrap the pizza object in a Dough decorator.

        //Simple Farm House pizza
        val pizza: Pizza = FarmHouse()
     
        //Cheese Burst Farm House pizza - costs additional 75
        val cheeseBurstPizza: Pizza = Dough(pizza = pizza, dough = "Cheese Burst", cost = 75.0)
     
        println(cheeseBurstPizza.description()) //Prints ...
        //A Farm House pizza with Cheese Burst base, topped with Onion, Tomato, Mushroom and priced at 275.0

  2. To add a topping, wrap the pizza object in a Topping decorator. With each topping price increases by 20.

        //Simple Farm House pizza
        val pizza: Pizza = FarmHouse()
             
        //Farm House pizza with Golden corn - costs additional 20
        val farmHouseWithCorn: Pizza = Topping(pizza = pizza, type = "Golden Corn")
             
        println(farmHouseWithCorn.description()) //Prints ...
        //A Farm House pizza with Regular base, topped with Onion, Tomato, Mushroom, Golden Corn and priced at 220.0

  Example: Cheese burst Farm House pizza topped with Golden corn

  val pizza = Dough( dough = "Cheese Burst", cost = 75.0,
          pizza = Topping( type = "Golden corn", pizza = FarmHouse()
      )
  )

Puzzle:

Implement a Kotlin DSL to make a pizza with choice of dough and toppings

With the help of DSL, one should be able to make a pizza as shown in code below.

    val pizza: Pizza = CheeseBurst Farmhouse pizza {
        topped with "Golden corn"
    }

    println(pizza.description()) //Prints ...
    //A Farmhouse pizza with Cheese Burst base, topped with Onion, Tomato, Mushroom, Golden corn and priced at 295.0

Note:

• You cannot change any code in package com.thoughtworks.workshop.kotlin.pizza.
• Implement your Dsl in Dsl.kt file.
• Uncomment sample dsl usage in main function.

Bonus points

1. Allow user to make pizza without additional toppings

      val pizza: Pizza = CheeseBurst Farmhouse pizza

2. Allow user to make pizza with regular dough

      val pizza: Pizza = Just Farmhouse pizza

3. Make DSL extendable to support different dough types such as Thin crust and basic pizzas like Pepperoni.