- >>= \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
+ >>= \t1-> typeExpr e2 >>= \t2-> pure $ TupleType (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
+//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")