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47 lines
1.7 KiB
Agda
47 lines
1.7 KiB
Agda
module FFI.Data.Vector where
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open import Agda.Builtin.Int using (Int; pos; negsuc)
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open import Agda.Builtin.Nat using (Nat)
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open import FFI.Data.Bool using (Bool; false; true)
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open import FFI.Data.HaskellInt using (HaskellInt; haskellIntToInt; intToHaskellInt)
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open import FFI.Data.Maybe using (Maybe; just; nothing)
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{-# FOREIGN GHC import qualified Data.Vector #-}
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postulate Vector : Set → Set
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{-# POLARITY Vector ++ #-}
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{-# COMPILE GHC Vector = type Data.Vector.Vector #-}
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postulate
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empty : ∀ {A} → (Vector A)
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null : ∀ {A} → (Vector A) → Bool
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unsafeHead : ∀ {A} → (Vector A) → A
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unsafeTail : ∀ {A} → (Vector A) → (Vector A)
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hLength : ∀ {A} → (Vector A) → HaskellInt
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hLookup : ∀ {A} → (Vector A) → HaskellInt → (Maybe A)
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snoc : ∀ {A} → (Vector A) → A → (Vector A)
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{-# COMPILE GHC empty = \_ -> Data.Vector.empty #-}
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{-# COMPILE GHC null = \_ -> Data.Vector.null #-}
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{-# COMPILE GHC unsafeHead = \_ -> Data.Vector.unsafeHead #-}
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{-# COMPILE GHC unsafeTail = \_ -> Data.Vector.unsafeTail #-}
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{-# COMPILE GHC hLength = \_ -> Data.Vector.length #-}
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{-# COMPILE GHC hLookup = \_ -> (Data.Vector.!?) #-}
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{-# COMPILE GHC snoc = \_ -> Data.Vector.snoc #-}
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head : ∀ {A} → (Vector A) → (Maybe A)
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head vec with null vec
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head vec | false = just (unsafeHead vec)
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head vec | true = nothing
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tail : ∀ {A} → (Vector A) → Vector A
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tail vec with null vec
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tail vec | false = unsafeTail vec
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tail vec | true = empty
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length : ∀ {A} → (Vector A) → Nat
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length vec with haskellIntToInt(hLength vec)
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length vec | pos n = n
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length vec | negsuc n = 0
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lookup : ∀ {A} → (Vector A) → Nat → Maybe A
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lookup vec n = hLookup vec (intToHaskellInt (pos n))
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