blob: 1368cb6620ba007496d88f55ba1c1620e1d63dc1 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE TypeOperators #-}
module Sink where
import AST
newtype env :> env' = Weaken { (>:>) :: forall t'. Idx env t' -> Idx env' t' }
wId :: env :> env
wId = Weaken id
wSucc :: env :> env' -> env :> (a ': env')
wSucc (Weaken f) = Weaken (Succ . f)
wSink :: env :> env' -> (a ': env) :> (a ': env')
wSink w = Weaken (\case Zero -> Zero
Succ i -> Succ (w >:> i))
(.>) :: env2 :> env3 -> env1 :> env2 -> env1 :> env3
Weaken f .> Weaken g = Weaken (f . g)
sinkExp :: env :> env' -> Exp env a -> Exp env' a
sinkExp w = \case
App e1 e2 -> App (sinkExp w e1) (sinkExp w e2)
Lam t e -> Lam t (sinkExp (wSink w) e)
Var t i -> Var t (w >:> i)
Let e1 e2 -> Let (sinkExp w e1) (sinkExp (wSink w) e2)
Lit l -> Lit l
Cond e1 e2 e3 -> Cond (sinkExp w e1) (sinkExp w e2) (sinkExp w e3)
Const c -> Const c
Pair e1 e2 -> Pair (sinkExp w e1) (sinkExp w e2)
Fst e -> Fst (sinkExp w e)
Snd e -> Snd (sinkExp w e)
Build sht e1 e2 -> Build sht (sinkExp w e1) (sinkExp w e2)
Ifold sht e1 e2 e3 -> Ifold sht (sinkExp w e1) (sinkExp w e2) (sinkExp w e3)
Index e1 e2 -> Index (sinkExp w e1) (sinkExp w e2)
Shape e -> Shape (sinkExp w e)
sinkExp1 :: Exp env a -> Exp (t ': env) a
sinkExp1 = sinkExp (wSucc wId)
sinkExp2 :: Exp env a -> Exp (t1 ': t2 ': env) a
sinkExp2 = sinkExp (wSucc (wSucc wId))
|
