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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TupleSections #-}
{-# LANGUAGE TypeOperators #-}
module Pretty (
prettyExp,
pprintExp,
) where
import Data.Bifunctor
import Prettyprinter
import Prettyprinter.Render.String
import AST
newtype IdGen a = IdGen { runIdGen :: Int -> (a, Int) }
instance Functor IdGen where
fmap f (IdGen g) = IdGen (first f . g)
instance Applicative IdGen where
pure x = IdGen (x,)
IdGen f <*> IdGen g = IdGen (\i -> let (f', j) = f i in first f' (g j))
instance Monad IdGen where
IdGen f >>= g = IdGen (\i -> let (x, j) = f i in runIdGen (g x) j)
evalIdGen :: Int -> IdGen a -> a
evalIdGen i = fst . ($ i) . runIdGen
genId :: IdGen Int
genId = IdGen (\i -> (i, i + 1))
genName :: IdGen String
genName = ('x' :) . show <$> genId
data PEnv env where
Top :: PEnv env
PCons :: String -> PEnv env -> PEnv (a ': env)
prettyExp :: Exp env a -> String
prettyExp e = renderString (layoutSmart opts (evalIdGen 1 (pExp definfo 0 Top e)))
where opts = LayoutOptions (AvailablePerLine 120 0.7)
pprintExp :: Exp env a -> IO ()
pprintExp = putStrLn . prettyExp
data Info = Info
{ infoLamTypeSig :: Bool }
deriving (Show)
definfo :: Info
definfo = Info True
pExp :: forall env a x. Info -> Int -> PEnv env -> Exp env a -> IdGen (Doc x)
pExp thisinfo d env = \case
App (Const CAddF) (Pair a b) -> do
a' <- pExp definfo 7 env a
b' <- pExp definfo 7 env b
return (flatAlt (pParen (d > 10) $ pretty "AddF" <+> align (vsep [a', b']))
(pParen (d > 6) $ hsep [a', pretty "+", b']))
App (Const CMulF) (Pair a b) -> do
a' <- pExp definfo 8 env a
b' <- pExp definfo 8 env b
return (flatAlt (pParen (d > 10) $ pretty "MulF" <+> align (vsep [a', b']))
(pParen (d > 7) $ hsep [a', pretty "*", b']))
e@(App _ _) -> do
let collectAppsRev :: Exp env t -> IdGen (Doc x', [Doc x'])
collectAppsRev (App f a) = do
a' <- pExp definfo 11 env a
rest <- collectAppsRev f
return (fmap (a' :) rest)
collectAppsRev f = (,[]) <$> pExp definfo 11 env f
(func, rhss) <- collectAppsRev e
return (pParen (d > 10) $ func <+> align (sep (reverse rhss)))
Lam t e -> do
name <- genName
let prefix | infoLamTypeSig thisinfo =
pretty ("\\(" ++ name ++ " :: " ++ showType 0 t ") ->")
| otherwise =
pretty ("\\" ++ name ++ " ->")
body <- pExp definfo 0 (PCons name env) e
return (pParen (d > 0) $ nest 2 (sep [prefix, body]))
Var t i ->
case (env, i) of
(Top, _) -> return (pretty ("xUP_" ++ show (idxToInt i)))
(PCons name _, Zero) -> return (pretty name)
(PCons _ env', Succ i') -> pExp definfo d env' (Var t i')
e@(Let _ _) -> do
let collectLets :: PEnv env' -> Exp env' t -> IdGen (Doc x', [Doc x'])
collectLets env' (Let rhs body) = do
name <- genName
rhs' <- (pretty (name ++ " = ") <>) . group <$> pExp definfo 0 env' rhs
rest <- collectLets (PCons name env') body
return (fmap (rhs' :) rest)
collectLets env' f = (,[]) <$> pExp definfo 0 env' f
(core, rhss) <- collectLets env e
return (pParen (d > 0) $
align (vsep [pretty "let" <+> align (vsep rhss)
,pretty "in" <+> group core]))
Lit l -> return (pretty (showLit d l ""))
Cond e1 e2 e3 -> do
e1' <- pExp definfo 11 env e1
e2' <- pExp definfo 11 env e2
e3' <- pExp definfo 11 env e3
return (flatAlt (pParen (d > 10) $ pretty "cond" <+> align (vsep [e1', e2', e3']))
(pParen (d > 0) $ hsep [e1', pretty "?", e2', pretty ":", e3']))
Const c -> return (pretty (showConst c))
Pair e1 e2 -> do
e1' <- pExp definfo 0 env e1
e2' <- pExp definfo 0 env e2
return (tupled [e1', e2'])
Fst e -> do
e' <- pExp definfo 11 env e
return (pParen (d > 10) $ pretty "fst" <+> e')
Snd e -> do
e' <- pExp definfo 11 env e
return (pParen (d > 10) $ pretty "snd" <+> e')
Build sht e1 e2 -> do
e1' <- pExp definfo 11 env e1
e2' <- pExp definfo{infoLamTypeSig=False} 11 env e2
return (pParen (d > 10) $
pretty "build" <+> align (sep
[pretty ("DIM" <> show (shtToInt sht)), e1', e2']))
Ifold sht e1 e2 e3 -> do
e1' <- pExp (definfo{infoLamTypeSig=False}) 11 env e1
e2' <- pExp definfo 11 env e2
e3' <- pExp definfo 11 env e3
return (pParen (d > 10) $
pretty "ifold" <+> align (sep
[pretty ("DIM" <> show (shtToInt sht)), e1', e2', e3']))
Index e1 e2 -> do
e1' <- pExp definfo 11 env e1
e2' <- pExp definfo 11 env e2
return (pParen (d > 10) $
flatAlt (pretty "index" <+> align (sep [e1', e2']))
(hsep [e1', pretty "!", e2']))
Shape e -> do
e' <- pExp definfo 11 env e
return (pParen (d > 10) $ pretty "shape" <+> e')
Undef t -> return (pParen (d > 0) $ pretty ("UNDEF :: " ++ showType 0 t ""))
pParen :: Bool -> Doc x -> Doc x
pParen True = parens
pParen False = id
showLit :: Int -> Literal a -> ShowS
showLit _ (LInt i) = shows i
showLit _ (LBool b) = shows b
showLit _ (LDouble d) = shows d
showLit d (LArray (Array sh t v))
| Just Has <- typeHasShow t
= showParen (d > 0) $
shows v . showString " :: Array " . showShape 11 sh . showString " " . showType 11 t
| otherwise
= showParen (d > 0) $
showString "[{noshow}] :: Array " . showShape 11 sh . showString " " . showType 11 t
showLit d (LShape sh) = showShape d sh
showLit _ LNil = showString "()"
showLit _ (LPair a b) =
showString "(" . showLit 0 a . showString ", " . showLit 0 b . showString ")"
showConst :: Constant a -> String
showConst CAddI = "AddI"
showConst CSubI = "SubI"
showConst CMulI = "MulI"
showConst CDivI = "DivI"
showConst CAddF = "AddF"
showConst CSubF = "SubF"
showConst CMulF = "MulF"
showConst CDivF = "DivF"
showConst CLog = "Log"
showConst CExp = "Exp"
showConst CtoF = "ToF"
showConst CRound = "Round"
showConst CLtI = "LtI"
showConst CLeI = "LeI"
showConst CLtF = "LtF"
showConst (CEq _) = "Eq"
showConst CAnd = "And"
showConst COr = "Or"
showConst CNot = "Not"
showShape :: Int -> Shape sh -> ShowS
showShape _ Z = showString "Z"
showShape d (sh :. n) = showParen (d > 10) $
showShape 10 sh . showString ":" . shows n
showType :: Int -> Type a -> ShowS
showType _ TInt = showString "Int"
showType _ TBool = showString "Bool"
showType _ TDouble = showString "Double"
showType _ (TArray sht t) =
let n = shtToInt sht
in showString (replicate n '[') . showType 0 t . showString (replicate n ']')
showType _ TNil = showString "()"
showType _ (TPair a b) =
showString "(" . showType 0 a . showString ", " . showType 0 b . showString ")"
showType d (TFun a b) = showParen (d > 10) $
showType 11 a . showString " -> " . showType 10 b
-- showTypeShort :: Int -> Type a -> ShowS
-- showTypeShort _ TInt = showString "i"
-- showTypeShort _ TBool = showString "b"
-- showTypeShort _ TDouble = showString "d"
-- showTypeShort _ (TArray sht t) =
-- let n = shtToInt sht
-- in showString (replicate n '[') . showTypeShort 0 t . showString (replicate n ']')
-- showTypeShort _ TNil = showString "."
-- showTypeShort _ (TPair a b) =
-- showString "(" . showTypeShort 11 a . showTypeShort 11 b . showString ")"
-- showTypeShort d (TFun a b) = showParen (d > 10) $
-- showTypeShort 11 a . showString " -> " . showTypeShort 10 b
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