src/Tools/Code/code_scala.ML
author haftmann
Sat Jul 24 18:08:41 2010 +0200 (2010-07-24)
changeset 37958 9728342bcd56
parent 37932 d00a3f47b607
child 38059 72f4630d4c43
permissions -rw-r--r--
another refinement chapter in the neverending numeral story
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(*  Title:      Tools/Code/code_scala.ML
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    Author:     Florian Haftmann, TU Muenchen
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Serializer for Scala.
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*)
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signature CODE_SCALA =
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sig
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  val target: string
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  val setup: theory -> theory
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end;
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structure Code_Scala : CODE_SCALA =
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struct
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val target = "Scala";
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open Basic_Code_Thingol;
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open Code_Printer;
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infixr 5 @@;
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infixr 5 @|;
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(** Scala serializer **)
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fun print_scala_stmt labelled_name syntax_tyco syntax_const reserved
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    args_num is_singleton_constr deresolve =
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  let
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    val deresolve_base = Long_Name.base_name o deresolve;
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    fun lookup_tyvar tyvars = lookup_var tyvars o first_upper;
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    fun intro_tyvars vs = intro_vars (map (first_upper o fst) vs);
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    fun print_tyco_expr tyvars fxy (tyco, tys) = applify "[" "]"
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          (print_typ tyvars NOBR) fxy ((str o deresolve) tyco) tys
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    and print_typ tyvars fxy (tyco `%% tys) = (case syntax_tyco tyco
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         of NONE => print_tyco_expr tyvars fxy (tyco, tys)
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          | SOME (i, print) => print (print_typ tyvars) fxy tys)
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      | print_typ tyvars fxy (ITyVar v) = (str o lookup_tyvar tyvars) v;
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    fun print_dicttyp tyvars (class, ty) = print_tyco_expr tyvars NOBR (class, [ty]);
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    fun print_tupled_typ tyvars ([], ty) =
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          print_typ tyvars NOBR ty
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      | print_tupled_typ tyvars ([ty1], ty2) =
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          concat [print_typ tyvars BR ty1, str "=>", print_typ tyvars NOBR ty2]
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      | print_tupled_typ tyvars (tys, ty) =
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          concat [enum "," "(" ")" (map (print_typ tyvars NOBR) tys),
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            str "=>", print_typ tyvars NOBR ty];
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    fun constraint p1 p2 = Pretty.block [p1, str ":", Pretty.brk 1, p2];
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    fun print_var vars NONE = str "_"
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      | print_var vars (SOME v) = (str o lookup_var vars) v
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    fun print_term tyvars is_pat some_thm vars fxy (IConst c) =
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          print_app tyvars is_pat some_thm vars fxy (c, [])
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      | print_term tyvars is_pat some_thm vars fxy (t as (t1 `$ t2)) =
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          (case Code_Thingol.unfold_const_app t
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           of SOME app => print_app tyvars is_pat some_thm vars fxy app
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            | _ => applify "(" ")" (print_term tyvars is_pat some_thm vars NOBR) fxy
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                (print_term tyvars is_pat some_thm vars BR t1) [t2])
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      | print_term tyvars is_pat some_thm vars fxy (IVar v) =
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          print_var vars v
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      | print_term tyvars is_pat some_thm vars fxy ((v, ty) `|=> t) =
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          let
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            val vars' = intro_vars (the_list v) vars;
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          in
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            concat [
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              enclose "(" ")" [constraint (print_var vars' v) (print_typ tyvars NOBR ty)],
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              str "=>",
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              print_term tyvars false some_thm vars' NOBR t
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            ]
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          end 
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      | print_term tyvars is_pat some_thm vars fxy (ICase (cases as (_, t0))) =
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          (case Code_Thingol.unfold_const_app t0
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           of SOME (c_ts as ((c, _), _)) => if is_none (syntax_const c)
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                then print_case tyvars some_thm vars fxy cases
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                else print_app tyvars is_pat some_thm vars fxy c_ts
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            | NONE => print_case tyvars some_thm vars fxy cases)
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    and print_app tyvars is_pat some_thm vars fxy
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        (app as ((c, ((arg_typs, _), function_typs)), ts)) =
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      let
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        val k = length ts;
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        val arg_typs' = if is_pat orelse
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          (is_none (syntax_const c) andalso is_singleton_constr c) then [] else arg_typs;
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        val (l, print') = case syntax_const c
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         of NONE => (args_num c, fn ts => applify "(" ")"
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              (print_term tyvars is_pat some_thm vars NOBR) fxy
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                (applify "[" "]" (print_typ tyvars NOBR)
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                  NOBR ((str o deresolve) c) arg_typs') ts)
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          | SOME (Plain_const_syntax (k, s)) => (k, fn ts => applify "(" ")"
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              (print_term tyvars is_pat some_thm vars NOBR) fxy
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                (applify "[" "]" (print_typ tyvars NOBR)
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                  NOBR (str s) arg_typs') ts)
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          | SOME (Complex_const_syntax (k, print)) =>
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              (k, fn ts => print (print_term tyvars is_pat some_thm) some_thm vars fxy
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                (ts ~~ take k function_typs))
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      in if k = l then print' ts
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      else if k < l then
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        print_term tyvars is_pat some_thm vars fxy (Code_Thingol.eta_expand l app)
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      else let
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        val (ts1, ts23) = chop l ts;
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      in
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        Pretty.block (print' ts1 :: map (fn t => Pretty.block
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          [str ".apply(", print_term tyvars is_pat some_thm vars NOBR t, str ")"]) ts23)
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      end end
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    and print_bind tyvars some_thm fxy p =
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      gen_print_bind (print_term tyvars true) some_thm fxy p
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    and print_case tyvars some_thm vars fxy (cases as ((_, [_]), _)) =
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          let
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            val (binds, body) = Code_Thingol.unfold_let (ICase cases);
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            fun print_match ((pat, ty), t) vars =
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              vars
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              |> print_bind tyvars some_thm BR pat
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              |>> (fn p => concat [str "val", constraint p (print_typ tyvars NOBR ty),
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                  str "=", print_term tyvars false some_thm vars NOBR t])
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            val (all_ps, vars') = fold_map print_match binds vars;
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            val (ps, p) = split_last all_ps;
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          in brackify_block fxy
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            (str "{")
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            (ps @ Pretty.block [p, str ";"] @@ print_term tyvars false some_thm vars' NOBR body)
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            (str "}")
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          end
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      | print_case tyvars some_thm vars fxy (((t, ty), clauses as _ :: _), _) =
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          let
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            fun print_select (pat, body) =
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              let
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                val (p_pat, vars') = print_bind tyvars some_thm NOBR pat vars;
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                val p_body = print_term tyvars false some_thm vars' NOBR body
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              in concat [str "case", p_pat, str "=>", p_body] end;
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          in brackify_block fxy
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            (concat [print_term tyvars false some_thm vars NOBR t, str "match", str "{"])
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            (map print_select clauses)
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            (str "}") 
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          end
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      | print_case tyvars some_thm vars fxy ((_, []), _) =
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          (brackify fxy o Pretty.breaks o map str) ["error(\"empty case\")"];
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    fun print_context tyvars vs name = applify "[" "]"
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      (fn (v, sort) => (Pretty.block o map str)
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        (lookup_tyvar tyvars v :: maps (fn sort => [": ", deresolve sort]) sort))
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          NOBR ((str o deresolve) name) vs;
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    fun print_defhead tyvars vars name vs params tys ty =
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      Pretty.block [str "def ", constraint (applify "(" ")" (fn (param, ty) =>
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        constraint ((str o lookup_var vars) param) (print_typ tyvars NOBR ty))
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          NOBR (print_context tyvars vs name) (params ~~ tys)) (print_typ tyvars NOBR ty),
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            str " ="];
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    fun print_def name (vs, ty) [] =
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          let
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            val (tys, ty') = Code_Thingol.unfold_fun ty;
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            val params = Name.invents (snd reserved) "a" (length tys);
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            val tyvars = intro_tyvars vs reserved;
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            val vars = intro_vars params reserved;
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          in
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            concat [print_defhead tyvars vars name vs params tys ty',
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              str ("error(\"" ^ name ^ "\")")]
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          end
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      | print_def name (vs, ty) eqs =
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          let
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            val tycos = fold (fn ((ts, t), _) =>
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              fold Code_Thingol.add_tyconames (t :: ts)) eqs [];
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            val tyvars = reserved
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              |> intro_base_names
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                   (is_none o syntax_tyco) deresolve tycos
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              |> intro_tyvars vs;
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            val simple = case eqs
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             of [((ts, _), _)] => forall Code_Thingol.is_IVar ts
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              | _ => false;
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            val consts = fold Code_Thingol.add_constnames
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              (map (snd o fst) eqs) [];
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            val vars1 = reserved
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              |> intro_base_names
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                   (is_none o syntax_const) deresolve consts
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            val params = if simple
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              then (map (fn IVar (SOME x) => x) o fst o fst o hd) eqs
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              else aux_params vars1 (map (fst o fst) eqs);
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            val vars2 = intro_vars params vars1;
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            val (tys', ty') = Code_Thingol.unfold_fun_n (length params) ty;
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            fun print_tuple [p] = p
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              | print_tuple ps = enum "," "(" ")" ps;
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            fun print_rhs vars' ((_, t), (some_thm, _)) =
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              print_term tyvars false some_thm vars' NOBR t;
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            fun print_clause (eq as ((ts, _), (some_thm, _))) =
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              let
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                val vars' = intro_vars ((fold o Code_Thingol.fold_varnames)
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                  (insert (op =)) ts []) vars1;
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              in
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                concat [str "case",
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                  print_tuple (map (print_term tyvars true some_thm vars' NOBR) ts),
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                  str "=>", print_rhs vars' eq]
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              end;
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            val head = print_defhead tyvars vars2 name vs params tys' ty';
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          in if simple then
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            concat [head, print_rhs vars2 (hd eqs)]
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          else
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            Pretty.block_enclose
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              (concat [head, print_tuple (map (str o lookup_var vars2) params),
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                str "match", str "{"], str "}")
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              (map print_clause eqs)
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          end;
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    val print_method = (str o Library.enclose "`" "+`" o deresolve_base);
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    fun print_stmt (name, Code_Thingol.Fun (_, (((vs, ty), raw_eqs), _))) =
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          print_def name (vs, ty) (filter (snd o snd) raw_eqs)
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      | print_stmt (name, Code_Thingol.Datatype (_, (vs, cos))) =
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          let
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            val tyvars = intro_tyvars vs reserved;
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            fun print_co ((co, _), []) =
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                  concat [str "final", str "case", str "object", (str o deresolve_base) co,
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                    str "extends", applify "[" "]" I NOBR ((str o deresolve_base) name)
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                      (replicate (length vs) (str "Nothing"))]
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              | print_co ((co, vs_args), tys) =
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                  concat [applify "(" ")"
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                    (fn (v, arg) => constraint (str v) (print_typ tyvars NOBR arg)) NOBR
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                    (applify "[" "]" (str o lookup_tyvar tyvars) NOBR ((concat o map str)
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                      ["final", "case", "class", deresolve_base co]) vs_args)
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                    (Name.names (snd reserved) "a" tys),
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                    str "extends",
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                    applify "[" "]" (str o lookup_tyvar tyvars o fst) NOBR
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                      ((str o deresolve_base) name) vs
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                  ];
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          in
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            Pretty.chunks (applify "[" "]" (str o prefix "+" o lookup_tyvar tyvars o fst)
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              NOBR ((concat o map str) ["abstract", "sealed", "class", deresolve_base name]) vs
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                :: map print_co cos)
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          end
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      | print_stmt (name, Code_Thingol.Class (_, (v, (super_classes, classparams)))) =
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          let
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            val tyvars = intro_tyvars [(v, [name])] reserved;
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            fun add_typarg s = Pretty.block
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              [str s, str "[", (str o lookup_tyvar tyvars) v, str "]"];
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            fun print_super_classes [] = NONE
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              | print_super_classes classes = SOME (concat (str "extends"
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                  :: separate (str "with") (map (add_typarg o deresolve o fst) classes)));
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            fun print_classparam_val (classparam, ty) =
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              concat [str "val", constraint (print_method classparam)
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                ((print_tupled_typ tyvars o Code_Thingol.unfold_fun) ty)];
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            fun print_classparam_def (classparam, ty) =
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              let
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                val (tys, ty) = Code_Thingol.unfold_fun ty;
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                val [implicit_name] = Name.invents (snd reserved) (lookup_tyvar tyvars v) 1;
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                val proto_vars = intro_vars [implicit_name] reserved;
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                val auxs = Name.invents (snd proto_vars) "a" (length tys);
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                val vars = intro_vars auxs proto_vars;
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              in
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                concat [str "def", constraint (Pretty.block [applify "(" ")"
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                  (fn (aux, ty) => constraint ((str o lookup_var vars) aux)
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                  (print_typ tyvars NOBR ty)) NOBR (add_typarg (deresolve classparam))
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                  (auxs ~~ tys), str "(implicit ", str implicit_name, str ": ",
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                  add_typarg (deresolve name), str ")"]) (print_typ tyvars NOBR ty), str "=",
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                  applify "(" ")" (str o lookup_var vars) NOBR
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                  (Pretty.block [str implicit_name, str ".", print_method classparam]) auxs]
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              end;
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          in
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            Pretty.chunks (
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              (Pretty.block_enclose
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                (concat ([str "trait", (add_typarg o deresolve_base) name]
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                  @ the_list (print_super_classes super_classes) @ [str "{"]), str "}")
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                (map print_classparam_val classparams))
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              :: map print_classparam_def classparams
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            )
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          end
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      | print_stmt (name, Code_Thingol.Classinst ((class, (tyco, vs)),
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            (super_instances, (classparam_instances, further_classparam_instances)))) =
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          let
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            val tyvars = intro_tyvars vs reserved;
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            val classtyp = (class, tyco `%% map (ITyVar o fst) vs);
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            fun print_classparam_instance ((classparam, const as (_, (_, tys))), (thm, _)) =
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              let
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                val aux_tys = Name.names (snd reserved) "a" tys;
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                val auxs = map fst aux_tys;
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                val vars = intro_vars auxs reserved;
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                val aux_abstr = if null auxs then [] else [enum "," "(" ")"
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                  (map (fn (aux, ty) => constraint ((str o lookup_var vars) aux)
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                  (print_typ tyvars NOBR ty)) aux_tys), str "=>"];
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              in 
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                concat ([str "val", print_method classparam, str "="]
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                  @ aux_abstr @| print_app tyvars false (SOME thm) vars NOBR
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                    (const, map (IVar o SOME) auxs))
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              end;
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          in
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            Pretty.block_enclose (concat [str "implicit def",
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              constraint (print_context tyvars vs name) (print_dicttyp tyvars classtyp),
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              str "=", str "new", print_dicttyp tyvars classtyp, str "{"], str "}")
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                (map print_classparam_instance (classparam_instances @ further_classparam_instances))
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          end;
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  in print_stmt end;
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fun scala_program_of_program labelled_name module_name reserved raw_module_alias program =
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  let
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    val the_module_name = the_default "Program" module_name;
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    val module_alias = K (SOME the_module_name);
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    val reserved = Name.make_context reserved;
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    fun prepare_stmt (name, stmt) (nsps, stmts) =
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      let
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        val (_, base) = Code_Printer.dest_name name;
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   290
        val mk_name_stmt = yield_singleton Name.variants;
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   291
        fun add_class ((nsp_class, nsp_object), nsp_common) =
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          let
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   293
            val (base', nsp_class') = mk_name_stmt base nsp_class
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          in (base', ((nsp_class', nsp_object), Name.declare base' nsp_common)) end;
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   295
        fun add_object ((nsp_class, nsp_object), nsp_common) =
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   296
          let
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   297
            val (base', nsp_object') = mk_name_stmt base nsp_object
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          in (base', ((nsp_class, nsp_object'), Name.declare base' nsp_common)) end;
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   299
        fun add_common upper ((nsp_class, nsp_object), nsp_common) =
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   300
          let
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            val (base', nsp_common') =
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              mk_name_stmt (if upper then first_upper base else base) nsp_common
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          in
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            (base',
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              ((Name.declare base' nsp_class, Name.declare base' nsp_object), nsp_common'))
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   306
          end;
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        val add_name = case stmt
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         of Code_Thingol.Fun _ => add_object
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          | Code_Thingol.Datatype _ => add_class
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          | Code_Thingol.Datatypecons _ => add_common true
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          | Code_Thingol.Class _ => add_class
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          | Code_Thingol.Classrel _ => add_object
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          | Code_Thingol.Classparam _ => add_object
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          | Code_Thingol.Classinst _ => add_common false;
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   315
        fun add_stmt base' = case stmt
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         of Code_Thingol.Datatypecons _ => cons (name, (base', NONE))
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          | Code_Thingol.Classrel _ => cons (name, (base', NONE))
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          | Code_Thingol.Classparam _ => cons (name, (base', NONE))
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          | _ => cons (name, (base', SOME stmt));
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   320
      in
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        nsps
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        |> add_name
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        |-> (fn base' => rpair (add_stmt base' stmts))
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   324
      end;
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    val stmts = AList.make (Graph.get_node program) (Graph.strong_conn program |> flat)
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      |> filter_out (Code_Thingol.is_case o snd);
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    val (_, sca_program) = fold prepare_stmt stmts (((reserved, reserved), reserved), []);
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    fun deresolver name = (fst o the o AList.lookup (op =) sca_program) name
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      handle Option => error ("Unknown statement name: " ^ labelled_name name);
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  in (deresolver, (the_module_name, sca_program)) end;
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   331
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   332
fun serialize_scala raw_module_name labelled_name
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   333
    raw_reserved includes raw_module_alias
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    _ syntax_tyco syntax_const (code_of_pretty, code_writeln)
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    program stmt_names destination =
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  let
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    val presentation_stmt_names = Code_Target.stmt_names_of_destination destination;
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    val module_name = if null presentation_stmt_names then raw_module_name else SOME "Code";
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    val reserved = fold (insert (op =) o fst) includes raw_reserved;
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   340
    val (deresolver, (the_module_name, sca_program)) = scala_program_of_program labelled_name
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   341
      module_name reserved raw_module_alias program;
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   342
    val reserved = make_vars reserved;
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   343
    fun lookup_constr tyco constr = case Graph.get_node program tyco
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   344
     of Code_Thingol.Datatype (_, (_, constrs)) =>
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   345
          the (AList.lookup (op = o apsnd fst) constrs constr);
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   346
    fun classparams_of_class class = case Graph.get_node program class
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   347
     of Code_Thingol.Class (_, (_, (_, classparams))) => classparams;
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   348
    fun args_num c = case Graph.get_node program c
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   349
     of Code_Thingol.Fun (_, (((_, ty), []), _)) =>
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   350
          (length o fst o Code_Thingol.unfold_fun) ty
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   351
      | Code_Thingol.Fun (_, ((_, ((ts, _), _) :: _), _)) => length ts
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   352
      | Code_Thingol.Datatypecons (_, tyco) => length (lookup_constr tyco c)
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   353
      | Code_Thingol.Classparam (_, class) =>
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   354
          (length o fst o Code_Thingol.unfold_fun o the o AList.lookup (op =)
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   355
            (classparams_of_class class)) c;
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   356
    fun is_singleton_constr c = case Graph.get_node program c
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   357
     of Code_Thingol.Datatypecons (_, tyco) => null (lookup_constr tyco c)
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   358
      | _ => false;
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   359
    val print_stmt = print_scala_stmt labelled_name syntax_tyco syntax_const
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   360
      reserved args_num is_singleton_constr deresolver;
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   361
    fun print_module name imports content =
haftmann@37881
   362
      (name, Pretty.chunks (
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   363
        str ("object " ^ name ^ " {")
haftmann@37881
   364
        :: (if null imports then []
haftmann@37881
   365
          else str "" :: map (fn name => str ("import " ^ name ^ "._")) imports)
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   366
        @ [str "",
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   367
        content,
haftmann@34294
   368
        str "",
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   369
        str "}"]
haftmann@37881
   370
      ));
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   371
    fun serialize_module the_module_name sca_program =
haftmann@34294
   372
      let
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   373
        val content = Pretty.chunks2 (map_filter
haftmann@34294
   374
          (fn (name, (_, SOME stmt)) => SOME (print_stmt (name, stmt))
haftmann@34294
   375
            | (_, (_, NONE)) => NONE) sca_program);
haftmann@37881
   376
      in print_module the_module_name (map fst includes) content end;
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   377
    fun check_destination destination =
haftmann@34294
   378
      (File.check destination; destination);
haftmann@34294
   379
    fun write_module destination (modlname, content) =
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   380
      let
haftmann@34294
   381
        val filename = case modlname
haftmann@34294
   382
         of "" => Path.explode "Main.scala"
haftmann@34294
   383
          | _ => (Path.ext "scala" o Path.explode o implode o separate "/"
haftmann@34294
   384
                o Long_Name.explode) modlname;
haftmann@34294
   385
        val pathname = Path.append destination filename;
haftmann@37669
   386
        val _ = File.mkdir_leaf (Path.dir pathname);
haftmann@34294
   387
      in File.write pathname (code_of_pretty content) end
haftmann@34294
   388
  in
haftmann@37748
   389
    Code_Target.mk_serialization target
haftmann@34294
   390
      (fn NONE => K () o map (code_writeln o snd) | SOME file => K () o map
haftmann@34294
   391
        (write_module (check_destination file)))
haftmann@34294
   392
      (rpair [] o cat_lines o map (code_of_pretty o snd))
haftmann@37881
   393
      (map (fn (name, content) => print_module name [] content) includes
haftmann@34294
   394
        @| serialize_module the_module_name sca_program)
haftmann@34294
   395
      destination
haftmann@34294
   396
  end;
haftmann@34294
   397
haftmann@34294
   398
val literals = let
haftmann@37224
   399
  fun char_scala c = if c = "'" then "\\'"
haftmann@37224
   400
    else if c = "\"" then "\\\""
haftmann@37224
   401
    else if c = "\\" then "\\\\"
haftmann@37224
   402
    else let val k = ord c
haftmann@37224
   403
    in if k < 32 orelse k > 126 then "\\" ^ radixstring (8, "0", k) else c end
haftmann@34944
   404
  fun numeral_scala k = if k < 0
haftmann@37958
   405
    then if k > ~ 2147483647 then "- " ^ string_of_int (~ k)
haftmann@34944
   406
      else quote ("- " ^ string_of_int (~ k))
haftmann@34944
   407
    else if k <= 2147483647 then string_of_int k
haftmann@34944
   408
      else quote (string_of_int k)
haftmann@34294
   409
in Literals {
haftmann@34294
   410
  literal_char = Library.enclose "'" "'" o char_scala,
haftmann@34294
   411
  literal_string = quote o translate_string char_scala,
haftmann@34944
   412
  literal_numeral = fn k => "BigInt(" ^ numeral_scala k ^ ")",
haftmann@37881
   413
  literal_positive_numeral = fn k => "Nat(" ^ numeral_scala k ^ ")",
haftmann@37958
   414
  literal_alternative_numeral = fn k => "Natural(" ^ numeral_scala k ^ ")",
haftmann@37958
   415
  literal_naive_numeral = fn k => "BigInt(" ^ numeral_scala k ^ ")",
haftmann@34888
   416
  literal_list = fn [] => str "Nil" | ps => Pretty.block [str "List", enum "," "(" ")" ps],
haftmann@34294
   417
  infix_cons = (6, "::")
haftmann@34294
   418
} end;
haftmann@34294
   419
haftmann@34294
   420
haftmann@34294
   421
(** Isar setup **)
haftmann@34294
   422
haftmann@37821
   423
fun isar_serializer module_name =
haftmann@34294
   424
  Code_Target.parse_args (Scan.succeed ())
haftmann@34294
   425
  #> (fn () => serialize_scala module_name);
haftmann@34294
   426
haftmann@34294
   427
val setup =
haftmann@37821
   428
  Code_Target.add_target
haftmann@37822
   429
    (target, { serializer = isar_serializer, literals = literals,
haftmann@37822
   430
      check = { env_var = "SCALA_HOME", make_destination = I,
haftmann@37822
   431
        make_command = fn scala_home => fn p => fn _ =>
haftmann@37932
   432
          "export JAVA_OPTS='-Xms128m -Xmx512m -Xss2m' && "
haftmann@37932
   433
            ^ Path.implode (Path.append (Path.explode scala_home) (Path.explode "bin/scalac")) ^ " *.scala" } })
haftmann@37464
   434
  #> Code_Target.add_syntax_tyco target "fun"
haftmann@37464
   435
     (SOME (2, fn print_typ => fn fxy => fn [ty1, ty2] =>
haftmann@37464
   436
        brackify_infix (1, R) fxy (
haftmann@37464
   437
          print_typ BR ty1 (*product type vs. tupled arguments!*),
haftmann@37464
   438
          str "=>",
haftmann@37464
   439
          print_typ (INFX (1, R)) ty2
haftmann@37464
   440
        )))
haftmann@34294
   441
  #> fold (Code_Target.add_reserved target) [
haftmann@34294
   442
      "abstract", "case", "catch", "class", "def", "do", "else", "extends", "false",
haftmann@34294
   443
      "final", "finally", "for", "forSome", "if", "implicit", "import", "lazy",
haftmann@34294
   444
      "match", "new", "null", "object", "override", "package", "private", "protected",
haftmann@34294
   445
      "requires", "return", "sealed", "super", "this", "throw", "trait", "try",
haftmann@37243
   446
      "true", "type", "val", "var", "while", "with", "yield"
haftmann@34294
   447
    ]
haftmann@34294
   448
  #> fold (Code_Target.add_reserved target) [
haftmann@37639
   449
      "apply", "error", "BigInt", "Nil", "List"
haftmann@34294
   450
    ];
haftmann@34294
   451
haftmann@34294
   452
end; (*struct*)