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{-# LANGUAGE AllowAmbiguousTypes #-} | |
module Test2 where | |
import Control.Monad.Free | |
import Control.Monad | |
data BreadType = Baguette | Toast | |
deriving (Show, Eq, Ord) | |
data Component | |
= Bread BreadType | |
| Tomato | |
| Salt | |
| Cheese | |
deriving (Show, Eq, Ord) | |
data SandwichBody = SandwichBody BreadType [Component] | |
deriving (Show, Eq, Ord) | |
data Sandwich = Sandwich BreadType (Maybe BreadType) [Component] | |
deriving (Show, Eq, Ord) | |
data SandwichConstructor next | |
= StartNewSandwich BreadType Component (SandwichBody -> next) | |
| AddComponent Component SandwichBody (SandwichBody -> next) | |
| FinishSandwich (Maybe BreadType) SandwichBody (Sandwich -> next) | |
instance Functor SandwichConstructor where | |
fmap _ _ = undefined | |
type SandwichRecipe a = Free SandwichConstructor a | |
startNewSandwich :: BreadType -> Component -> SandwichRecipe SandwichBody | |
startNewSandwich = undefined | |
addComponent :: Component -> SandwichBody -> SandwichRecipe SandwichBody | |
addComponent = undefined | |
finishSandwich :: (Maybe BreadType) -> SandwichBody -> SandwichRecipe Sandwich | |
finishSandwich = undefined | |
data Crust = ThickCrust | ThinCrust | |
deriving (Show, Eq, Ord) | |
data PizzaComponent = Salami | AmericanCheese | |
deriving (Show, Eq, Ord) | |
data Pizza = Pizza Crust [PizzaComponent] | |
deriving (Show, Eq, Ord) | |
data PizzaConstructor next | |
= MakeCirclePizza Crust [PizzaComponent] (Pizza -> next) | |
| MakeSquarePizza Crust [PizzaComponent] (Pizza -> next) | |
instance Functor PizzaConstructor where | |
fmap _ _ = undefined | |
type PizzaRecipe a = Free PizzaConstructor a | |
makeCirclePizza :: Crust -> [PizzaComponent] -> PizzaRecipe Pizza | |
makeCirclePizza crust comp = liftF (MakeCirclePizza crust comp id) | |
data Meal | |
= PreparedPizza Pizza | |
| PreparedSandwich Sandwich | |
deriving (Show, Eq, Ord) | |
data CookingMethod next | |
= MakePizza (PizzaRecipe Pizza) (Pizza -> next) | |
| MakeSandwich (SandwichRecipe Sandwich) (Sandwich -> next) | |
| MakeRandomPizzaRecipe (PizzaRecipe Pizza -> next) | |
class Monad m => CSandwichRecipe m where | |
-- TODO | |
class Monad m => CPizzaRecipe m where | |
-- TODO | |
class Monad m => CCookingMachine m where | |
cmakePizza :: CPizzaRecipe r => r Pizza -> m Pizza | |
cmakeSandwitch :: CSandwichRecipe r => r Sandwich -> m Sandwich | |
cmakeRandomPizzaRceipe :: CPizzaRecipe mm => m (mm Pizza) | |
csampleCookingMachine | |
:: forall m mm | |
. CPizzaRecipe mm | |
=> CCookingMachine m | |
=> m [Meal] | |
csampleCookingMachine = do | |
-- pizza <- cmakePizza (cMakeCirclePizza ThickCrust []) -- how to make this compile?? | |
rndPizzaRecipe :: mm Pizza <- cmakeRandomPizzaRceipe | |
rndPizza <- cmakePizza rndPizzaRecipe | |
pure [{-PreparedPizza pizza,-} PreparedPizza rndPizza] | |
makePizza :: PizzaRecipe Pizza -> CookingMachine Meal | |
makePizza receipe = undefined | |
makeSandwich :: SandwichRecipe Sandwich -> CookingMachine Meal | |
makeSandwich receipe = undefined | |
makeRandomPizzaRecipe :: CookingMachine (PizzaRecipe Pizza) | |
makeRandomPizzaRecipe = undefined | |
instance Functor CookingMethod where | |
fmap _ _ = undefined | |
type CookingMachine a = Free CookingMethod a | |
myPizza :: PizzaRecipe Pizza | |
myPizza = undefined | |
mySandwich :: SandwichRecipe Sandwich | |
mySandwich = do | |
body1 <- startNewSandwich Toast Tomato | |
body2 <- addComponent Cheese body1 | |
body3 <- addComponent Salt body2 | |
finishSandwich Nothing body3 | |
sampleCookingMachine :: CookingMachine [Meal] | |
sampleCookingMachine = do | |
pizza <- makePizza (makeCirclePizza ThickCrust []) | |
rndPizzaRecipe <- makeRandomPizzaRecipe | |
rndPizza <- makePizza rndPizzaRecipe | |
pure [pizza, rndPizza] | |
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