{-# LANGUAGE GADTSyntax #-}
{-# LANGUAGE KindSignatures #-}
{-
Copyright 2019 The CodeWorld Authors. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-}
module CodeWorld.App
{-# WARNING "This is an experimental API. It can change at any time." #-}
(
Rule,
timeRule,
eventRule,
pictureRule,
multiEventRule,
multiPictureRule,
subrule,
rules,
applicationOf,
unsafeMultiApplicationOf
) where
import CodeWorld
import Data.List (foldl')
import System.Random (StdGen)
data Rule :: * -> * where
TimeRule :: (Double -> state -> state) -> Rule state
EventRule :: (Int -> Event -> state -> state) -> Rule state
PictureRule :: (Int -> state -> Picture) -> Rule state
Rules :: [Rule state] -> Rule state
timeRule :: (Double -> state -> state) -> Rule state
timeRule = TimeRule
eventRule :: (Event -> state -> state) -> Rule state
eventRule = EventRule . const
pictureRule :: (state -> Picture) -> Rule state
pictureRule = PictureRule . const
multiEventRule :: (Int -> Event -> state -> state) -> Rule state
multiEventRule = EventRule
multiPictureRule :: (Int -> state -> Picture) -> Rule state
multiPictureRule = PictureRule
subrule :: (a -> b) -> (b -> a -> a) -> Rule b -> Rule a
subrule getter setter (TimeRule step_b) = TimeRule step_a
where step_a dt a = setter (step_b dt (getter a)) a
subrule getter setter (EventRule event_b) = EventRule event_a
where event_a k ev a = setter (event_b k ev (getter a)) a
subrule getter setter (PictureRule pic_b) = PictureRule pic_a
where pic_a n = pic_b n . getter
subrule getter setter (Rules rules) = Rules (map (subrule getter setter) rules)
rules :: [Rule state] -> Rule state
rules = Rules
applicationOf :: world -> [Rule world] -> IO ()
applicationOf w rules = interactionOf w step event picture
where step dt = foldl' (.) id [ f dt | f <- concatMap stepHandlers rules ]
event ev = foldl' (.) id [ f ev | f <- concatMap eventHandlers rules ]
picture w = pictures [ pic w | pic <- concatMap pictureHandlers rules ]
stepHandlers (TimeRule f) = [f]
stepHandlers (Rules rs) = concatMap stepHandlers rs
stepHandlers _ = []
eventHandlers (EventRule f) = [f 0]
eventHandlers (Rules rs) = concatMap eventHandlers rs
eventHandlers _ = []
pictureHandlers (PictureRule f) = [f 0]
pictureHandlers (Rules rs) = concatMap pictureHandlers rs
pictureHandlers _ = []
unsafeMultiApplicationOf :: Int -> (StdGen -> state) -> [Rule state] -> IO ()
unsafeMultiApplicationOf n initial rules =
unsafeCollaborationOf n initial step event picture
where step dt = foldl' (.) id [ f dt | f <- concatMap stepHandlers rules ]
event k ev = foldl' (.) id [ f k ev | f <- concatMap eventHandlers rules ]
picture k w = pictures [ pic k w | pic <- concatMap pictureHandlers rules ]
stepHandlers (TimeRule f) = [f]
stepHandlers (Rules rs) = concatMap stepHandlers rs
stepHandlers _ = []
eventHandlers (EventRule f) = [f]
eventHandlers (Rules rs) = concatMap eventHandlers rs
eventHandlers _ = []
pictureHandlers (PictureRule f) = [f]
pictureHandlers (Rules rs) = concatMap pictureHandlers rs
pictureHandlers _ = []