41 lines
1.5 KiB
Haskell
41 lines
1.5 KiB
Haskell
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.Constrain.Declaration as TcDecl
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import qualified Type.Solve as Solve
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import SourceSyntax.Module
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import qualified SourceSyntax.Expression as Expr
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import SourceSyntax.PrettyPrint
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import Text.PrettyPrint
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import qualified Type.State as TS
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import Control.Monad.State
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import Control.Arrow (second)
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import Transform.SortDefinitions as Sort
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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. Not sure if that'd be worthwhile.
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infer :: MetadataModule t v -> Either [Doc] (Map.Map String T.Variable)
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infer modul = unsafePerformIO $ do
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env <- Env.initialEnvironment (datatypes modul)
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var <- T.flexibleVar
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ctors <- forM (Map.keys (Env.constructor env)) $ \name ->
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do (_, vars, tipe) <- Env.freshDataScheme env name
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return (name, (vars, tipe))
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let vars = concatMap (fst . snd) ctors
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header = Map.map snd (Map.fromList ctors)
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environ = T.CLet [ T.Scheme vars [] T.CTrue header ]
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constraint <- environ `fmap` TcExpr.constrain env (program modul) (T.VarN var)
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state <- execStateT (Solve.solve constraint) TS.initialState
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let errors = TS.sErrors state
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if null errors
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then return $ Right (Map.difference (TS.sSavedEnv state) header)
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else Left `fmap` sequence errors
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