Created
November 27, 2015 17:01
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| module Main where | |
| import Prelude | |
| import Data.Array (reverse) | |
| import Data.Foldable (traverse_) | |
| import Data.Monoid | |
| import Data.Traversable (traverse) | |
| import Control.Applicative.Free | |
| import Control.Apply | |
| import Control.Monad.Eff | |
| import DOM | |
| import Math | |
| import Signal | |
| import Signal.Channel | |
| -- A simplified version of the current Flare API | |
| type ElementId = String | |
| type Label = String | |
| type EventHandler a = a -> Eff (chan :: Chan) Unit | |
| foreign import data Element :: * | |
| foreign import appendComponent :: forall e. ElementId | |
| -> Element -> Eff (dom :: DOM | e) Unit | |
| type CreateComponent a = forall e b. Label | |
| -> a | |
| -> EventHandler b | |
| -> Eff (dom :: DOM, chan :: Chan | e) Element | |
| foreign import cNumber :: CreateComponent Number | |
| foreign import cString :: CreateComponent String | |
| foreign import renderString :: forall e. ElementId | |
| -> String | |
| -> Eff (dom :: DOM | e) Unit | |
| data Flare a = Flare (Array Element) (Signal a) | |
| instance functorFlare :: Functor Flare where | |
| map f (Flare cs sig) = Flare cs (map f sig) | |
| instance applyFlare :: Apply Flare where | |
| apply (Flare cs1 sig1) (Flare cs2 sig2) = Flare (cs1 <> cs2) (sig1 <*> sig2) | |
| instance applicativeFlare :: Applicative Flare where | |
| pure x = Flare mempty (pure x) | |
| newtype UI e a = UI (Eff (dom :: DOM, chan :: Chan | e) (Flare a)) | |
| instance functorUI :: Functor (UI e) where | |
| map f (UI a) = UI $ map (map f) a | |
| instance applyUI :: Apply (UI e) where | |
| apply (UI a1) (UI a2) = UI $ lift2 apply a1 a2 | |
| instance applicativeUI :: Applicative (UI e) where | |
| pure x = UI $ return (pure x) | |
| -- my attempt to build a free applicative interface on top of this: | |
| data Component = CompNumber Label Number | |
| | CompString Label String | |
| data Cell a = Cell (Array Component) a | |
| type Field = FreeAp Cell | |
| number :: Label -> Number -> Field Number | |
| number label default = liftFreeAp (Cell [CompNumber label default] default) | |
| string :: Label -> String -> Field String | |
| string label default = liftFreeAp (Cell [CompString label default] default) | |
| cellToUI :: forall e. NaturalTransformation Cell (UI e) | |
| cellToUI (Cell components x) = UI $ do | |
| chan <- channel x | |
| elements <- traverse (toElement (send chan)) components | |
| return (Flare elements (subscribe chan)) | |
| toElement :: forall a e. EventHandler a | |
| -> Component | |
| -> Eff (dom :: DOM, chan :: Chan | e) Element | |
| toElement send (CompNumber label default) = cNumber label default send | |
| toElement send (CompString label default) = cString label default send | |
| runFlare :: forall e a. (Show a) | |
| => ElementId | |
| -> ElementId | |
| -> Field a | |
| -> Eff (chan :: Chan, dom :: DOM | e) Unit | |
| runFlare controls target field = | |
| case foldFreeAp cellToUI field of | |
| (UI setup) -> do | |
| (Flare els sig) <- setup | |
| traverse_ (appendComponent controls) (reverse els) | |
| runSignal (map (show >>> renderString target) sig) | |
| main = | |
| runFlare "controls" "output" $ | |
| pow <$> number "Base" 2.0 | |
| <*> number "Exponent" 10.0 |
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