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g2q: G2Q allows constraint programming, via writing Haskell predicates.

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G2Q allows constraint programming, via writing Haskell predicates. A quasiquoter, g2, is provided which can take concrete arguments at runtime, and solve for unknown symbolic arguments.

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Versions 0.1.0.0, 0.1.0.0
Change log ChangeLog.md
Dependencies base (>=4.10 && <4.11), g2 (>=0.1.0.1 && <0.1.1.0) [details]
License BSD-3-Clause
Author William Hallahan, Anton Xue
Maintainer william.hallahan@yale.edu
Category Formal Methods, Symbolic Computation
Source repo head: git clone https://github.com/BillHallahan/G2Q.git
Uploaded by WilliamHallahan at 2019-06-30T03:11:28Z

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G2Q

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G2Q allows constraint programming, via writing Haskell predicates. A quasiquoter, g2, is provided which can take concrete arguments at runtime, and solve for unknown symbolic arguments.

For example, to find inputs from a list xs which sum to a given number n, you can write:

sumToN :: Int -> [Int] -> IO (Maybe [Int])
sumToN = [g2| \(n :: Int) (xs :: [Int]) ->
              ?(ys :: [Int])
            |  sum ys == n
            && all (\e -> e `elem` xs) ys
            && length ys >= 1 |]