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omega - Programming language

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omega is a programming language created in 2005 by Tim Sheard.

#818on PLDB 18Years Old

The Ωmega interpreter is styled after the Hugs Haskell Interpreter. The Ωmega syntax is based upon the syntax of Haskell. If you’re unsure of what syntax to use, a best first approximation is to use Haskell syntax. It works most of the time. While clearly descended from Haskell, Ωmega has several important syntactic and semantic differences.

Example from the web:
-- -- This code written by James Hook -- This file should work with Omega version 1.1 -- released May 23, 2005 -- See {-- These are predefined by the compiler kind Nat = Z | S Nat data Nat' n = Z where n = Z | forall m . S (Nat' m) where n = S m -} data LE a b = LeBase where a = b | ex c . LeStep (LE a c) where b = S c reflLE :: LE a a reflLE = LeBase transLE :: (LE a b) -> (LE b c) -> (LE a c) transLE p LeBase = p transLE p (LeStep q) = LeStep (transLE p q) compare :: Nat' a -> Nat' b -> ((LE a b)+(LE b a)) compare Z Z = L LeBase compare Z (S x) = case compare Z x of L w -> L (LeStep w) compare (S x) Z = case compare Z x of L w -> R (LeStep w) compare (S x) (S y) = mapP g g (compare x y ) where mapP f g (L x) = L(f x) mapP f g (R x) = R(g x) g :: LE x y -> LE (S x) (S y) g LeBase = LeBase g (LeStep x) = LeStep (g x) data MonoList min max = MonoNil (LE min max) | forall n a . MonoCons (Nat' n) (LE a n) (LE n max) (MonoList min a) appMonoList :: MonoList b c -> MonoList a b -> MonoList a c appMonoList (MonoNil bc) (MonoNil ab) = MonoNil (transLE ab bc) appMonoList (MonoNil bc) (MonoCons n an nb xs) = MonoCons n an (transLE nb bc) xs appMonoList (MonoCons m dm mc ys) xs = MonoCons m dm mc (appMonoList ys xs) singletonMonoList :: Nat' n -> MonoList n n singletonMonoList n = MonoCons n reflLE reflLE (MonoNil reflLE) data IntervalList min max = ILNil (LE min max) | forall x . ILCons (Nat' x) (LE min x) (LE x max) (IntervalList min max) partition :: Nat' n -> LE a n -> LE n b -> IntervalList a b -> (IntervalList a n, IntervalList n b) partition x an nb xs = partitionAcc (ILNil an) (ILNil nb) xs where partitionAcc ls gs (ILNil ab) = (ls,gs) partitionAcc ls gs (ILCons y ay yb ys) = case compare y x of L yx -> partitionAcc (ILCons y ay yx ls) gs ys R xy -> partitionAcc ls (ILCons y xy yb gs) ys qsort :: IntervalList a b -> MonoList a b qsort (ILNil ab) = MonoNil ab qsort (ILCons x ax xb (ILNil ab)) = MonoCons x ax xb (MonoNil reflLE) qsort (ILCons x ax xb xs) = let (less,greater) = partition x ax xb xs sortedLess = qsort less sortedGreater = qsort greater in appMonoList sortedGreater (appMonoList (singletonMonoList x) sortedLess) --

Language features

Feature Supported Token Example
MultiLine Comments {- -}
{- A comment
-- A comment
Line Comments --
-- A comment
Semantic Indentation X

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