64 lines
2.5 KiB
Haskell
64 lines
2.5 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 :: Interfaces -> MetadataModule t v -> Either [Doc] (Map.Map String T.Variable)
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infer interfaces' modul = unsafePerformIO $ do
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let localImports = Map.fromList (imports modul)
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interfaces = Map.intersectionWithKey canonicalize localImports interfaces'
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-- mapM print (concatMap iAdts (Map.elems interfaces))
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env <- Env.initialEnvironment (datatypes modul ++ concatMap iAdts (Map.elems interfaces))
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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 locals = Map.intersectionWithKey combine localImports interfaces
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combine name importMethod interface =
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let tipes = iTypes interface in
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case importMethod of
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As alias -> Map.mapKeys (\v -> alias ++ "." ++ v) tipes
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Hiding hidens -> foldr Map.delete tipes hidens
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Importing visibles ->
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Map.intersection tipes (Map.fromList [ (v,()) | v <- visibles ])
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-- mapM print (map Map.toList $ Map.elems locals)
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-- mapM print (imports modul)
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importedVars <-
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forM (concatMap Map.toList $ Map.elems locals) $ \(name,tipe) ->
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(,) name `fmap` Env.instantiateTypeWithContext 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 = 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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-- print =<< T.extraPretty constraint
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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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