+mkAltsAssign ::
+ Either CoreBndr AST.VHDLName -- ^ The signal to assign to
+ -> [AST.Expr] -- ^ The conditions
+ -> [AST.Expr] -- ^ The expressions
+ -> AST.ConcSm -- ^ The Alt assigns
+mkAltsAssign dst conds exprs
+ | (length conds) /= ((length exprs) - 1) = error $ "\nVHDLTools.mkAltsAssign: conditions expression mismatch"
+ | otherwise =
+ let
+ whenelses = zipWith mkWhenElse conds exprs
+ false_wform = AST.Wform [AST.WformElem (last exprs) Nothing]
+ dst_name = case dst of
+ Left bndr -> AST.NSimple (varToVHDLId bndr)
+ Right name -> name
+ assign = dst_name AST.:<==: (AST.ConWforms whenelses false_wform Nothing)
+ in
+ AST.CSSASm assign
+ where
+ mkWhenElse :: AST.Expr -> AST.Expr -> AST.WhenElse
+ mkWhenElse cond true_expr =
+ let
+ true_wform = AST.Wform [AST.WformElem true_expr Nothing]
+ in
+ AST.WhenElse true_wform cond
+