src/Data/Array/Nested/Internal/Convert.hs


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

{-# LANGUAGE DataKinds #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE TypeOperators #-}
module Data.Array.Nested.Internal.Convert where

import Data.Type.Equality

import Data.Array.Mixed.Lemmas
import Data.Array.Mixed.Shape
import Data.Array.Nested.Internal.Lemmas
import Data.Array.Nested.Internal.Mixed
import Data.Array.Nested.Internal.Ranked
import Data.Array.Nested.Internal.Shape
import Data.Array.Nested.Internal.Shaped


stoRanked :: Elt a => Shaped sh a -> Ranked (Rank sh) a
stoRanked sarr@(Shaped arr)
  | Refl <- lemRankMapJust (sshape sarr)
  = mtoRanked arr

rcastToShaped :: Elt a => Ranked (Rank sh) a -> ShS sh -> Shaped sh a
rcastToShaped (Ranked arr) targetsh
  | Refl <- lemRankReplicate (shxRank (shCvtSX targetsh))
  , Refl <- lemRankMapJust targetsh
  = mcastToShaped arr targetsh