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https://github.com/idris-lang/Idris2.git
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65 lines
1.2 KiB
Idris
65 lines
1.2 KiB
Idris
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-- a mini prelude
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module Stuff
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public export
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data Bool = True | False
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public export
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not : Bool -> Bool
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not True = False
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not False = True
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public export
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data Maybe : Type -> Type where
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Nothing : Maybe a
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Just : (1 x : a) -> Maybe a
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public export
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data Either : Type -> Type -> Type where
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Left : (1 x : a) -> Either a b
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Right : (1 y : b) -> Either a b
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public export
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intToBool : Int -> Bool
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intToBool 0 = False
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intToBool x = True
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public export
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ifThenElse : Bool -> Lazy a -> Lazy a -> a
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ifThenElse True t e = t
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ifThenElse False t e = e
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public export
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data Nat = Z | S Nat
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public export
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fromInteger : Integer -> Nat
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fromInteger x = ifThenElse (intToBool (prim__eq_Integer x 0))
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Z (S (fromInteger (prim__sub_Integer x 1)))
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public export
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plus : Nat -> Nat -> Nat
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plus Z y = y
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plus (S k) y = S (plus k y)
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infixr 5 ::
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public export
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data List a = Nil | (::) a (List a)
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public export
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data Eq : a -> b -> Type where
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Refl : (x : a) -> Eq x x
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public export
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data Unit = MkUnit
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public export
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data Pair : Type -> Type -> Type where
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MkPair : {a, b : Type} -> a -> b -> Pair a b
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public export
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the : (a : Type) -> a -> a
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the _ x = x
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