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empty list type check fix, add typecheck to forward step (no tests yet)

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ProgramSnail 2025-11-05 02:36:33 +03:00
parent edc6c373b0
commit 753ca23cbc
2 changed files with 23 additions and 12 deletions
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4
escher/Main.hs
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@ -10,7 +10,7 @@ import Data.Set (Set)
import qualified Data.Map as Map
import qualified Data.Set as Set
import Data.List (inits)
import Data.Maybe (fromMaybe, isJust, maybeToList)
import Data.Maybe (fromMaybe, isJust, maybeToList, isNothing)
import Debug.Trace (trace)
import TypeCheck
@ -54,6 +54,8 @@ matchAnyOutputs outputs = do exprs <- gets syntExprs
-- generate next step of exprs, remove copies
forwardStep :: Expr -> [Expr] -> SyntState (Maybe Expr)
forwardStep comp args = do let expr = fillHoles comp args
typeConf <- gets $ oracleTypes . syntOracle
if isNothing $ checkType typeConf expr then return Nothing else do
outputs <- calcExprOutputs expr
matchedExisting <- gets $ evalState (matchAnyOutputs outputs)
-- TODO: all RecErrors example could be useful on future cases ?

19
escher/TypeCheck.hs
View file

@ -18,6 +18,11 @@ isList x | ListT {} <- typeOf x = True
isTree x | TreeT {} <- typeOf x = True
| otherwise = False
simpleUnify :: Type -> Type -> Maybe Type
simpleUnify AnyT u = Just u
simpleUnify t AnyT = Just t
simpleUnify _ _ = Nothing
checkType :: TypeConf -> Expr -> Maybe Type
checkType conf (left :&&: right) = do BoolT <- checkType conf left
BoolT <- checkType conf right
@ -49,18 +54,22 @@ checkType conf ZeroE = return IntT
checkType conf (Div2E e) = do IntT <- checkType conf e
return IntT
checkType conf (TailE e) = do ListT t <- checkType conf e
guard $ t /= AnyT -- NOTE: can't take tail from list that is provem empty (?)
-- TODO: check that AnyT is only for empty list & no bad consequences
return $ ListT t
checkType conf (HeadE e) = do ListT t <- checkType conf e
guard $ t /= AnyT -- NOTE: can't take elem from list that is provem empty (?)
-- TODO: check that AnyT is only for empty list & no bad consequences
return t
checkType conf (left :++: right) = do ListT t <- checkType conf left
ListT u <- checkType conf right
guard $ t == u
return $ ListT t
w <- simpleUnify t u
return $ ListT w
checkType conf (left ::: right) = do t <- checkType conf left
ListT u <- checkType conf right
guard $ t == u
return $ ListT t
checkType conf EmptyListE = return $ ListT AnyT -- TODO FIXME: deal with AnyT
w <- simpleUnify t u
return $ ListT w
checkType conf EmptyListE = return $ ListT AnyT -- NOTE: ListT AnyT - type of generic empty list
checkType conf (IsLeafE e) = do TreeT _ <- checkType conf e
return BoolT
checkType conf (TreeValE e) = do TreeT t <- checkType conf e