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]
+ toString (FieldSelectorError p t fs) = concat [
+ toString p,
+ "SemError: Cannot select ", toString fs, " from type: ",
+ toString t]
+ toString (OperatorError p o t) = concat [
+ toString p,
+ "SemError: No ", toString o, " for type ",
+ toString t]
+ toString (UndeclaredVariableError p ident) = concat [
+ toString p, "SemError: identifier: ", ident, " undefined."]
sem :: AST -> SemOutput
sem (AST vd fd) = case runStateT m ('Map'.newMap, getRandomStream 1) of
pure (vds, fds)
semFunDecl :: FunDecl -> Env FunDecl
-semFunDecl f = pure f
+semFunDecl fd=:(FunDecl p f _ mt vds stmts) = case mt of
+ Nothing = let t = IdType f in putIdent f t >>| pure fd
+ Just t = putIdent f t >>| pure fd
semVarDecl :: VarDecl -> Env VarDecl
semVarDecl (VarDecl pos type ident ex) = unify type ex
>>= \t-> putIdent ident t >>| (pure $ VarDecl pos t ident ex)
+typeOp2 :: Expr Expr Op2 [Type] -> Env Type
+typeOp2 e1 e2 op ts = typeExpr e1 >>= \t1-> typeExpr e2 >>= \t2->
+ unify t1 t2 >>= \t3->if (isMember t3 ts) (pure t3)
+ (liftT $ Left $ OperatorError (extrPos e1) op t3)
+
typeExpr :: Expr -> Env Type
typeExpr (IntExpr _ _) = pure IntType
typeExpr (CharExpr _ _) = pure CharType
typeExpr (Op1Expr p UnMinus expr) = unify IntType expr
typeExpr (TupleExpr p (e1, e2)) = typeExpr e1
>>= \t1-> typeExpr e2 >>= \t2-> pure $ TupleType (t1, t2)
-//Int
-typeExpr (Op2Expr p e1 BiPlus e2) = unify IntType e1 >>| unify IntType e2
-typeExpr (Op2Expr p e1 BiMinus e2) = unify IntType e1 >>| unify IntType e2
-typeExpr (Op2Expr p e1 BiTimes e2) = unify IntType e1 >>| unify IntType e2
-typeExpr (Op2Expr p e1 BiDivide e2) = unify IntType e1 >>| unify IntType e2
-typeExpr (Op2Expr p e1 BiMod e2) = unify IntType e1 >>| unify IntType e2
-//bool, char of int
-typeExpr (Op2Expr p e1 BiEquals e2) = typeExpr e1 >>= \t1 -> unify t1 e2
- >>| pure BoolType //todo, actually check t1 in Char,Bool,Int
-typeExpr (Op2Expr p e1 BiUnEqual e2) = typeExpr (Op2Expr p e1 BiEquals e2)
-//char of int
-typeExpr (Op2Expr p e1 BiLesser e2) = typeExpr e1 >>= \t1 -> unify t1 e2
- >>| pure BoolType //todo, actually check t1 in Char, Int
-typeExpr (Op2Expr p e1 BiGreater e2) = typeExpr (Op2Expr p e1 BiLesser e2)
-typeExpr (Op2Expr p e1 BiLesserEq e2) = typeExpr (Op2Expr p e1 BiLesser e2)
-typeExpr (Op2Expr p e1 BiGreaterEq e2) = typeExpr (Op2Expr p e1 BiLesser e2)
-//bool
-typeExpr (Op2Expr p e1 BiAnd e2) = unify BoolType e1 >>| unify BoolType e2
-typeExpr (Op2Expr p e1 BiOr e2) = unify BoolType e1 >>| unify BoolType e2
-//a
-typeExpr (Op2Expr p e1 BiCons e2) = typeExpr e1 >>= \t1-> typeExpr e2
- >>= \t2-> unify (ListType t1) t2
+typeExpr (Op2Expr p e1 op e2)
+| isMember op [BiPlus, BiMinus, BiTimes, BiDivide, BiMod] =
+ typeOp2 e1 e2 op [IntType]
+| isMember op [BiEquals, BiUnEqual] =
+ typeOp2 e1 e2 op [IntType, BoolType, CharType]
+| isMember op [BiLesser, BiGreater, BiLesserEq, BiGreaterEq] =
+ typeOp2 e1 e2 op [IntType, CharType]
+| isMember op [BiAnd, BiOr] =
+ typeOp2 e1 e2 op [BoolType]
+| op == BiCons = typeExpr e1 >>= \t1-> typeExpr e2
+ >>= \t2-> unify (ListType t1) t2
typeExpr (EmptyListExpr p) = freshIdent >>= \frsh-> let t = IdType frsh in
putIdent frsh t >>| pure t
-//typeExpr (FunExpr p FunCall) = undef
-//typeExpr (VarExpr Pos VarDef) = undef //when checking var-expr, be sure to
- //put the infered type in the context
+//ignore field selectors
+typeExpr (FunExpr p (FunCall f es)) = gets (\(st, r)->'Map'.get f st)
+ >>= \mt-> case mt of
+ Nothing = let t = IdType f in putIdent f t >>| pure t
+ Just t = unifyApp t es
+typeExpr (VarExpr p (VarDef ident fs)) = gets (\(st, r)->'Map'.get ident st)
+ >>= \mt->case mt of
+ Nothing = liftT $ Left $ UndeclaredVariableError p ident
+ Just t = unify t fs
+
+unifyApp :: Type [Expr] -> Env Type
+unifyApp t [] = pure t //whoop whoop, functions can return functions
+unifyApp (tf1 ->> tf2) [t1:ts] = (->>) <$> unify tf1 t1 <*> (unifyApp tf2 ts)
+unifyApp t1 t2 = liftT $ Left $ UnifyError zero t1 (IdType "[expressions, FIXME")
class unify a :: Type a -> Env Type
+instance unify [FieldSelector] where
+ unify t [] = pure t
+ unify (ListType t) [FieldHd:fs] = unify t fs
+ unify t=:(ListType _) [FieldTl:fs] = unify t fs
+ unify (TupleType (t, _)) [FieldFst:fs] = unify t fs
+ unify (TupleType (_, t)) [FieldSnd:fs] = unify t fs
+ unify t [fs:_] = liftT $ Left $ FieldSelectorError zero t fs
+
instance unify Expr where
unify (_ ->> _) e = liftT $ Left $ ParseError (extrPos e)
"Expression cannot be a higher order function. Yet..."
unify (IdType i) t=:(IdType j) = replace i t >>| pure t
unify t (IdType i) = unify (IdType i) t
unify (IdType i) t = replace i t >>| pure t
- //unify (ListType t1) (ListType t2) = unify t1 t2
+ unify (ListType t1) (ListType t2) = unify t1 t2 >>| (pure $ ListType t1)
unify t1 t2 = liftT $ Left $ UnifyError zero t1 t2
instance zero Pos where
decErr :: Expr SemError -> SemError
decErr e (UnifyError _ t1 t2) = UnifyError (extrPos e) t1 t2
+decErr e (FieldSelectorError _ t fs) = FieldSelectorError (extrPos e) t fs
decErr e (ParseError _ s) = ParseError (extrPos e) s
decErr e err = err
instance toString Gamma where
toString (mp, _) = concat
[concat [k, ": ", toString v, "\n"]\\(k, v) <- 'Map'.toList mp]
+
+
+// class free a :: a -> Env [a]
repositories / cc1516.git / blobdiff