add type of vardecl expr to gamma

[cc1516.git] / sem.icl

diff --git a/sem.icl b/sem.icl
index 1cb9e54..1a2ed00 100644 (file)
--- a/sem.icl
+++ b/sem.icl
@@ -1,26 +1,124 @@
 implementation module sem
 
-from Data.Map import :: Map
+import qualified Data.Map as Map
+from Data.Func import $
+import Data.Maybe
 import Data.Either
+import Data.Functor
+import Control.Applicative
+import Control.Monad
 import Control.Monad.State
+import Control.Monad.Identity
 import StdMisc
+from StdFunc import id, const
+import StdString
+import StdList
+
+from Text import class Text(concat), instance Text String
 
 import AST
-from parse import :: ParserOutput
-from yard import :: Error
+from parse import :: ParserOutput, :: Error
+
+:: Gamma :== 'Map'.Map String Type
+:: Env a :== (State Gamma (Either SemError a))
+
+get = state $ \s -> (s,s)
+
+putIdent :: String Type -> Env Void
+putIdent i t = gets ('Map'.get i) >>= \mt -> case mt of
+    Nothing = pure <$> modify ('Map'.put i t)
+    Just t2 = unify t t2 >>= \r -> case r of
+        Left e  = pure $ Left e
+        Right t3 = pure <$> modify ('Map'.put i t3)
+
+instance toString SemError where
+       toString (ParseError p e) = concat [
+               toString p,"SemError: ParseError: ", e]
+       toString (Error e) = "SemError: " +++ e
+       toString (UnifyErrorStub t1 t2) = toString (UnifyError {line=0,col=0} t1 t2)
+       toString (UnifyError p t1 t2) = concat [
+               toString p,
+               "SemError: Cannot unify types. Expected: ",
+               toString t1, ". Given: ", toString t2]
+
+sem :: AST -> SemOutput
+sem (AST vd fd)
+# (eithervds, gamma) = runState (mapM semVarDecl vd) 'Map'.newMap
+# (eitherfds, gamma) = runState (mapM semFunDecl fd) gamma
+= case splitEithers eithervds of
+       (Left errs) = Left $ errs ++ [x\\(Left x)<-eitherfds]
+       (Right vds) = case splitEithers eitherfds of
+               (Left errs) = Left errs
+               (Right fds) = Right $ AST vds fds
+
+splitEithers :: [Either a b] -> Either [a] [b]
+splitEithers [] = Right []
+splitEithers [Right x:xs] = splitEithers xs >>= \rest->Right [x:rest]
+splitEithers xs = Left $ [x\\(Left x)<-xs]
+
+semFunDecl :: FunDecl -> Env FunDecl
+semFunDecl f = pure $ Right f
+
+semVarDecl :: VarDecl -> Env VarDecl
+semVarDecl vd=:(VarDecl pos type ident ex) = unify type ex
+       >>= \et->case et of
+               Left err = pure $ Left err
+               Right t = putIdent ident t >>| pure (Right $ VarDecl pos t ident ex)
+//Right v
+//     //TODO ident in de environment
+//     Right e = Right $ pure vd
+
+typeExpr :: Expr -> Env Type
+typeExpr (IntExpr _ _) = pure $ Right IntType
+typeExpr (CharExpr _ _) = pure $ Right CharType
+typeExpr (BoolExpr _ _) = pure $ Right BoolType
+typeExpr (Op1Expr p UnNegation expr) = unify BoolType expr
+typeExpr (Op1Expr p UnMinus expr) = unify IntType expr
+typeExpr (TupleExpr p (e1, e2)) = typeExpr e1 
+       >>= \ete1->typeExpr e2 >>= \ete2->pure (
+               ete1 >>= \te1->ete2 >>= \te2->Right $ TupleType (te1, te2))
+//typeExpr (Op2Expr Pos Expr Op2 Expr) = undef
+//typeExpr (FunExpr Pos FunCall) = undef
+//typeExpr (EmptyListExpr Pos) = undef
+//typeExpr (VarExpr Pos VarDef) = undef
+
+class unify a :: Type a -> Env Type
 
-:: Gamma :== Map String Type
-:: Env a :== State Gamma a
+instance unify Expr where
+       unify (_ ->> _) e = pure $ Left $ ParseError (extrPos e)
+                       "Expression cannot be a higher order function. Yet..."
+       unify VoidType e = pure $ Left $ ParseError (extrPos e)
+                       "Expression cannot be a Void type."
+       unify (IdType _) e = pure $ Left $ ParseError (extrPos e)
+                       "Expression cannot be an polymorf type."
+       unify t e = typeExpr e
+               >>= \eithertype->case eithertype of
+                       Left e = pure $ Left e
+                       Right tex = unify t tex >>= \eitherun->case eitherun of
+                               Left err = pure $ Left $ decErr e err
+                               Right t = pure $ Right t
 
-sem :: ParserOutput -> SemOutput
-sem (Left p) = Left p
-sem (Right (AST vd fd)) = undef
-//     foldM semVarDecl vd 
-//     >>= \gamma ->foldM typecheck gamma fd
+instance unify Type where
+       unify IntType IntType = pure $ Right IntType
+       unify BoolType BoolType = pure $ Right BoolType
+       unify CharType CharType = pure $ Right CharType
+       unify t1 t2 = pure $ Left $ UnifyError zero t1 t2
 
-semVarDecl :: Env VarDecl
-semVarDecl = undef
-       
+instance zero Pos where
+       zero = {line=0,col=0}
 
+decErr :: Expr SemError -> SemError
+decErr e (UnifyError _ t1 t2) = UnifyError (extrPos e) t1 t2
+decErr e (ParseError _ s) = ParseError (extrPos e) s
+decErr e err = err
 
-        
+extrPos :: Expr -> Pos
+extrPos (VarExpr p _) = p
+extrPos (Op2Expr p _ _ _) = p
+extrPos (Op1Expr p _ _) = p
+extrPos (IntExpr p _) = p
+extrPos (CharExpr p _) = p
+extrPos (BoolExpr p _) = p
+extrPos (FunExpr p _) = p
+extrPos (EmptyListExpr p) = p
+extrPos (TupleExpr p _) = p