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DISCONTINUED. DEPRECATED in favor of ghc wasm backend, see https://www.tweag.io/blog/2022-11-22-wasm-backend-merged-in-ghc
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README
hint
This library defines an Interpreter monad within which you can interpret
strings like "[1,2] ++ [3]"
into values like [1,2,3]
. You can easily
exchange data between your compiled program and your interpreted program, as
long as the data has a Typeable
instance.
You can choose which modules should be in scope while evaluating these expressions, you can browse the contents of those modules, and you can ask for the type of the identifiers you're browsing.
It is, essentially, a huge subset of the GHC API wrapped in a simpler API.
Limitations
It is possible to run the interpreter inside a thread, but on GHC 8.8 and below, you can't run two instances of the interpreter simlutaneously.
GHC must be installed on the system on which the compiled executable is running.
Compatibility is kept to the three last major GHC releases: GHC 8.10, 8.8 and 8.6. When the next GHC release comes out and hint is adapted to work with it, we will drop support for GHC 8.6.
Example
{-# LANGUAGE LambdaCase, ScopedTypeVariables, TypeApplications #-}
import Control.Exception (throwIO)
import Control.Monad.Trans.Class (lift)
import Control.Monad.Trans.Writer (execWriterT, tell)
import Data.Foldable (for_)
import Data.Typeable (Typeable)
import qualified Language.Haskell.Interpreter as Hint
-- |
-- Interpret expressions into values:
--
-- >>> eval @[Int] "[1,2] ++ [3]"
-- [1,2,3]
--
-- Send values from your compiled program to your interpreted program by
-- interpreting a function:
--
-- >>> f <- eval @(Int -> [Int]) "\\x -> [1..x]"
-- >>> f 5
-- [1,2,3,4,5]
eval :: forall t. Typeable t
=> String -> IO t
eval s = runInterpreter $ do
Hint.setImports ["Prelude"]
Hint.interpret s (Hint.as :: t)
-- |
-- >>> :{
-- do contents <- browse "Prelude"
-- for_ contents $ \(identifier, tp) -> do
-- when ("put" `isPrefixOf` identifier) $ do
-- putStrLn $ identifier ++ " :: " ++ tp
-- :}
-- putChar :: Char -> IO ()
-- putStr :: String -> IO ()
-- putStrLn :: String -> IO ()
browse :: Hint.ModuleName -> IO [(String, String)]
browse moduleName = runInterpreter $ do
Hint.setImports ["Prelude", "Data.Typeable", moduleName]
exports <- Hint.getModuleExports moduleName
execWriterT $ do
for_ exports $ \case
Hint.Fun identifier -> do
tp <- lift $ Hint.typeOf identifier
tell [(identifier, tp)]
_ -> pure () -- skip datatypes and typeclasses
Check [example.hs](examples/example.hs) for a longer example (it must be run from hint's base directory).