57 lines
2.3 KiB
Haskell
57 lines
2.3 KiB
Haskell
{-# OPTIONS_GHC -W #-}
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module Type.Inference where
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import qualified Data.Map as Map
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import qualified Type.Type as T
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import qualified Type.Environment as Env
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import qualified Type.Constrain.Expression as TcExpr
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import qualified Type.Solve as Solve
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import SourceSyntax.Module as Module
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import SourceSyntax.Location (noneNoDocs)
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import SourceSyntax.Type (Type)
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import Text.PrettyPrint
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import qualified Type.State as TS
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import qualified Type.ExtraChecks as Check
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import Control.Monad.State (execStateT, forM)
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import Control.Monad.Error (runErrorT, liftIO)
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import qualified Type.Alias as Alias
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import System.IO.Unsafe -- Possible to switch over to the ST monad instead of
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-- the IO monad. I don't think that'd be worthwhile.
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infer :: Interfaces -> MetadataModule -> Either [Doc] (Map.Map String Type)
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infer interfaces modul = unsafePerformIO $ do
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env <- Env.initialEnvironment
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(datatypes modul ++ concatMap iAdts (Map.elems interfaces))
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(aliases modul ++ concatMap iAliases (Map.elems interfaces))
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ctors <- forM (Map.keys (Env.constructor env)) $ \name ->
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do (_, vars, args, result) <- Env.freshDataScheme env name
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return (name, (vars, foldr (T.==>) result args))
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attemptConstraint <- runErrorT $ do
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importedVars <-
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forM (concatMap (Map.toList . iTypes) $ Map.elems interfaces) $ \(name,tipe) ->
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(,) name `fmap` Env.instantiateType env tipe Map.empty
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let allTypes = ctors ++ importedVars
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vars = concatMap (fst . snd) allTypes
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header = Map.map snd (Map.fromList allTypes)
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environ = noneNoDocs . T.CLet [ T.Scheme vars [] (noneNoDocs T.CTrue) header ]
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fvar <- liftIO $ T.var T.Flexible
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c <- TcExpr.constrain env (program modul) (T.VarN fvar)
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return (header, environ c)
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case attemptConstraint of
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Left err -> return $ Left err
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Right (header, constraint) -> do
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state <- execStateT (Solve.solve constraint) TS.initialState
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let rules = Alias.rules interfaces (aliases modul) (imports modul)
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case TS.sErrors state of
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errors@(_:_) -> Left `fmap` sequence (map ($ rules) (reverse errors))
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[] -> case Check.portTypes rules (program modul) of
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Right () -> Check.mainType rules (Map.difference (TS.sSavedEnv state) header)
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Left err -> return (Left err)
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