module React.Flux.Internal(
ReactViewRef(..)
, ReactElementRef(..)
, ReactThis(..)
, HandlerArg(..)
, PropertyOrHandler(..)
, property
, (&=)
, ReactElement(..)
, ReactElementM(..)
, transHandler
, elemString
, elemText
, elemJSString
, elemShow
, el
, childrenPassedToView
, elementToM
, mkReactElement
, exportViewToJs
, toJSString
, JSString
) where
import Data.String (IsString(..))
import Data.Aeson
import Data.Typeable (Typeable)
import Control.Monad.Writer
import Control.Monad.Identity (Identity(..))
import qualified Data.Text as T
#ifdef __GHCJS__
import Unsafe.Coerce
import qualified Data.JSString as JSS
import qualified Data.JSString.Text as JSS
import JavaScript.Array (JSArray)
import qualified JavaScript.Array as JSA
import GHCJS.Foreign.Callback
import qualified JavaScript.Object as JSO
import GHCJS.Types (JSVal, JSString, IsJSVal, jsval)
import GHCJS.Marshal (ToJSVal(..))
import GHCJS.Foreign (jsNull)
import React.Flux.Export
#else
import Data.Text (Text)
type JSVal = ()
class ToJSVal a
instance ToJSVal Value
instance ToJSVal Text
instance ToJSVal ()
class IsJSVal a
type JSArray = JSVal
type JSString = String
instance IsJSVal JSVal
instance IsJSVal JSString
instance ToJSVal JSString
#endif
newtype ReactViewRef props = ReactViewRef { reactViewRef :: JSVal }
instance IsJSVal (ReactViewRef props)
newtype ReactElementRef = ReactElementRef { reactElementRef :: JSVal }
instance IsJSVal ReactElementRef
newtype HandlerArg = HandlerArg JSVal
instance IsJSVal HandlerArg
newtype ReactThis state props = ReactThis {reactThisRef :: JSVal }
instance IsJSVal (ReactThis state props)
instance Show HandlerArg where
show _ = "HandlerArg"
data PropertyOrHandler handler =
forall ref. ToJSVal ref => Property
{ propertyName :: JSString
, propertyVal :: ref
}
| forall ref. ToJSVal ref => PropertyFromContext
{ propFromThisName :: JSString
, propFromThisVal :: JSVal -> ref
}
| NestedProperty
{ nestedPropertyName :: JSString
, nestedPropertyVals :: [PropertyOrHandler handler]
}
| ElementProperty
{ elementPropertyName :: JSString
, elementValue :: ReactElementM handler ()
}
| CallbackPropertyWithArgumentArray
{ caPropertyName :: JSString
, caFunc :: JSArray -> IO handler
}
| CallbackPropertyWithSingleArgument
{ csPropertyName :: JSString
, csFunc :: HandlerArg -> handler
}
| forall props. Typeable props => CallbackPropertyReturningView
{ cretPropertyName :: JSString
, cretArgToProp :: JSArray -> IO props
, cretView :: ReactViewRef props
}
instance Functor PropertyOrHandler where
fmap _ (Property name val) = Property name val
fmap _ (PropertyFromContext name f) = PropertyFromContext name f
fmap f (NestedProperty name vals) = NestedProperty name (map (fmap f) vals)
fmap f (ElementProperty name (ReactElementM mkElem)) =
ElementProperty name $ ReactElementM $ mapWriter (\((),e) -> ((), fmap f e)) mkElem
fmap f (CallbackPropertyWithArgumentArray name h) = CallbackPropertyWithArgumentArray name (fmap f . h)
fmap f (CallbackPropertyWithSingleArgument name h) = CallbackPropertyWithSingleArgument name (f . h)
fmap _ (CallbackPropertyReturningView name f v) = CallbackPropertyReturningView name f v
property :: ToJSVal val => JSString -> val -> PropertyOrHandler handler
property = Property
(&=) :: ToJSVal a => JSString -> a -> PropertyOrHandler handler
n &= a = Property n a
data ReactElement eventHandler
= ForeignElement
{ fName :: Either JSString (ReactViewRef Object)
, fProps :: [PropertyOrHandler eventHandler]
, fChild :: ReactElement eventHandler
}
| forall props. Typeable props => ViewElement
{ ceClass :: ReactViewRef props
, ceKey :: Maybe JSVal
, ceProps :: props
, ceChild :: ReactElement eventHandler
}
| RawJsElement
{ rawTransform :: JSVal -> [ReactElementRef] -> IO ReactElementRef
, rawChild :: ReactElement eventHandler
}
| ChildrenPassedToView
| Content JSString
| Append (ReactElement eventHandler) (ReactElement eventHandler)
| EmptyElement
instance Monoid (ReactElement eventHandler) where
mempty = EmptyElement
mappend x y = Append x y
instance Functor ReactElement where
fmap f (ForeignElement n p c) = ForeignElement n (map (fmap f) p) (fmap f c)
fmap f (ViewElement n k p c) = ViewElement n k p (fmap f c)
fmap f (RawJsElement t c) = RawJsElement t (fmap f c)
fmap _ ChildrenPassedToView = ChildrenPassedToView
fmap f (Append a b) = Append (fmap f a) (fmap f b)
fmap _ (Content s) = Content s
fmap _ EmptyElement = EmptyElement
newtype ReactElementM eventHandler a = ReactElementM { runReactElementM :: Writer (ReactElement eventHandler) a }
deriving (Functor, Applicative, Monad, Foldable)
elementToM :: a -> ReactElement eventHandler -> ReactElementM eventHandler a
elementToM a e = ReactElementM (WriterT (Identity (a, e)))
instance (a ~ ()) => Monoid (ReactElementM eventHandler a) where
mempty = elementToM () EmptyElement
mappend e1 e2 =
let ((),e1') = runWriter $ runReactElementM e1
((),e2') = runWriter $ runReactElementM e2
in elementToM () $ Append e1' e2'
instance (a ~ ()) => IsString (ReactElementM eventHandler a) where
fromString s = elementToM () $ Content $ toJSString s
transHandler :: (handler1 -> handler2) -> ReactElementM handler1 a -> ReactElementM handler2 a
transHandler f (ReactElementM writer) = ReactElementM $ mapWriter f' writer
where
f' (a, x) = (a, fmap f x)
elemString :: String -> ReactElementM eventHandler ()
elemString s = elementToM () $ Content $ toJSString s
elemText :: T.Text -> ReactElementM eventHandler ()
#ifdef __GHCJS__
elemText s = elementToM () $ Content $ JSS.textToJSString s
#else
elemText s = elementToM () $ Content $ T.unpack s
#endif
elemJSString :: JSString -> ReactElementM eventHandler ()
elemJSString s = elementToM () $ Content s
elemShow :: Show a => a -> ReactElementM eventHandler ()
elemShow s = elementToM () $ Content $ toJSString $ show s
el :: JSString
-> [PropertyOrHandler eventHandler]
-> ReactElementM eventHandler a
-> ReactElementM eventHandler a
el name attrs (ReactElementM child) =
let (a, childEl) = runWriter child
in elementToM a $ ForeignElement (Left name) attrs childEl
childrenPassedToView :: ReactElementM eventHandler ()
childrenPassedToView = elementToM () ChildrenPassedToView
type CallbackToRelease = JSVal
mkReactElement :: forall eventHandler state props.
(eventHandler -> IO ())
-> ReactThis state props
-> ReactElementM eventHandler ()
-> IO (ReactElementRef, [CallbackToRelease])
#ifdef __GHCJS__
mkReactElement runHandler this = runWriterT . mToElem
where
mToElem :: ReactElementM eventHandler () -> MkReactElementM ReactElementRef
mToElem eM = do
let e = execWriter $ runReactElementM eM
e' = case e of
Content txt -> ForeignElement (Right $ ReactViewRef js_textWrapper) [] (Content txt)
_ -> e
refs <- createElement e'
case refs of
[] -> lift $ js_ReactCreateElementNoChildren js_divLikeElement
[x] -> return x
xs -> lift $ do
emptyObj <- JSO.create
let arr = jsval $ JSA.fromList $ map reactElementRef xs
js_ReactCreateForeignElement (ReactViewRef js_divLikeElement) emptyObj arr
addPropOrHandlerToObj :: JSO.Object -> PropertyOrHandler eventHandler -> MkReactElementM ()
addPropOrHandlerToObj obj (Property n val) = lift $ do
vRef <- toJSVal val
JSO.setProp n vRef obj
addPropOrHandlerToObj obj (PropertyFromContext n f) = lift $ do
ctx <- js_ReactGetContext this
vRef <- toJSVal $ f ctx
JSO.setProp n vRef obj
addPropOrHandlerToObj obj (NestedProperty n vals) = do
nested <- lift $ JSO.create
mapM_ (addPropOrHandlerToObj nested) vals
lift $ JSO.setProp n (jsval nested) obj
addPropOrHandlerToObj obj (ElementProperty name rM) = do
ReactElementRef ref <- mToElem rM
lift $ JSO.setProp name ref obj
addPropOrHandlerToObj obj (CallbackPropertyWithArgumentArray name func) = do
cb <- lift $ syncCallback1 ContinueAsync $ \argref -> do
handler <- func $ unsafeCoerce argref
runHandler handler
tell [jsval cb]
wrappedCb <- lift $ js_CreateArgumentsCallback cb
lift $ JSO.setProp name wrappedCb obj
addPropOrHandlerToObj obj (CallbackPropertyWithSingleArgument name func) = do
cb <- lift $ syncCallback1 ContinueAsync $ \ref ->
runHandler $ func $ HandlerArg ref
tell [jsval cb]
lift $ JSO.setProp name (jsval cb) obj
addPropOrHandlerToObj obj (CallbackPropertyReturningView name toProps v) = do
(cb, wrappedCb) <- lift $ exportViewToJs v toProps
tell [cb]
lift $ JSO.setProp name wrappedCb obj
createElement :: ReactElement eventHandler -> MkReactElementM [ReactElementRef]
createElement EmptyElement = return []
createElement (Append x y) = (++) <$> createElement x <*> createElement y
createElement (Content s) = return [js_ReactCreateContent s]
createElement ChildrenPassedToView = lift $ do
childRef <- js_ReactGetChildren this
return $ map ReactElementRef $ JSA.toList childRef
createElement (f@(ForeignElement{})) = do
obj <- lift $ JSO.create
mapM_ (addPropOrHandlerToObj obj) $ fProps f
childNodes <- createElement $ fChild f
let children = case map reactElementRef childNodes of
[] -> jsNull
[x] -> x
xs -> jsval $ JSA.fromList xs
e <- lift $ case fName f of
Left s -> js_ReactCreateElementName s obj children
Right ref -> js_ReactCreateForeignElement ref obj children
return [e]
createElement (ViewElement { ceClass = rc, ceProps = props, ceKey = mkey, ceChild = child }) = do
childNodes <- createElement child
propsE <- lift $ export props
let children = case map reactElementRef childNodes of
[] -> jsNull
[x] -> x
xs -> jsval $ JSA.fromList xs
e <- lift $ case mkey of
Just keyRef -> js_ReactCreateKeyedElement rc keyRef propsE children
Nothing -> js_ReactCreateClass rc propsE children
return [e]
createElement (RawJsElement trans child) = do
childNodes <- createElement child
e <- liftIO $ trans (reactThisRef this) childNodes
return [e]
type MkReactElementM a = WriterT [CallbackToRelease] IO a
foreign import javascript unsafe
"React['createElement']($1)"
js_ReactCreateElementNoChildren :: JSVal -> IO ReactElementRef
foreign import javascript unsafe
"React['createElement']($1, $2, $3)"
js_ReactCreateElementName :: JSString -> JSO.Object -> JSVal -> IO ReactElementRef
foreign import javascript unsafe
"React['createElement']($1, $2, $3)"
js_ReactCreateForeignElement :: ReactViewRef a -> JSO.Object -> JSVal -> IO ReactElementRef
foreign import javascript unsafe
"React['createElement']($1, {hs:$2}, $3)"
js_ReactCreateClass :: ReactViewRef a -> Export props -> JSVal -> IO ReactElementRef
foreign import javascript unsafe
"React['createElement']($1, {key: $2, hs:$3}, $4)"
js_ReactCreateKeyedElement :: ReactViewRef a -> JSVal -> Export props -> JSVal -> IO ReactElementRef
foreign import javascript unsafe
"hsreact$mk_arguments_callback($1)"
js_CreateArgumentsCallback :: Callback (JSVal -> IO ()) -> IO JSVal
foreign import javascript unsafe
"hsreact$wrap_callback_returning_element($1)"
js_wrapCallbackReturningElement :: Callback (JSVal -> JSVal -> IO ()) -> IO JSVal
foreign import javascript unsafe
"$1.elem = $2"
js_setElemReturnFromCallback :: JSVal -> ReactElementRef -> IO ()
foreign import javascript unsafe
"$r = hsreact$divLikeElement"
js_divLikeElement :: JSVal
foreign import javascript unsafe
"$r = hsreact$textWrapper"
js_textWrapper :: JSVal
foreign import javascript unsafe
"$1['context']"
js_ReactGetContext :: ReactThis state props -> IO JSVal
foreign import javascript unsafe
"hsreact$children_to_array($1['props']['children'])"
js_ReactGetChildren :: ReactThis state props -> IO JSArray
js_ReactCreateContent :: JSString -> ReactElementRef
js_ReactCreateContent = ReactElementRef . unsafeCoerce
toJSString :: String -> JSString
toJSString = JSS.pack
exportViewToJs :: Typeable props => ReactViewRef props -> (JSArray -> IO props) -> IO (CallbackToRelease, JSVal)
exportViewToJs view toProps = do
cb <- syncCallback2 ContinueAsync $ \ret argref -> do
props <- toProps $ unsafeCoerce argref
propsE <- export props
e <- js_ReactCreateClass view propsE jsNull
js_setElemReturnFromCallback ret e
wrappedCb <- js_wrapCallbackReturningElement cb
return (jsval cb, wrappedCb)
#else
mkReactElement _ _ _ = return (ReactElementRef (), [])
toJSString :: String -> String
toJSString = id
exportViewToJs :: Typeable props => ReactViewRef props -> (JSArray -> IO props) -> IO (CallbackToRelease, JSVal)
exportViewToJs _ _ = return ((), ())
#endif