src/HOL/Tools/datatype_abs_proofs.ML
author berghofe
Wed, 15 Mar 2000 23:36:46 +0100
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permissions -rw-r--r--
- Fixed bug in prove_casedist_thms (proof failed because of name clashes) - Now returns theorems with correct names in derivations
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(*  Title:      HOL/Tools/datatype_abs_proofs.ML
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    ID:         $Id$
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    Author:     Stefan Berghofer
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    Copyright   1998  TU Muenchen
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Proofs and defintions independent of concrete representation
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of datatypes  (i.e. requiring only abstract properties such as
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injectivity / distinctness of constructors and induction)
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 - case distinction (exhaustion) theorems
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 - characteristic equations for primrec combinators
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 - characteristic equations for case combinators
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 - equations for splitting "P (case ...)" expressions
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 - datatype size function
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 - "nchotomy" and "case_cong" theorems for TFL
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*)
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signature DATATYPE_ABS_PROOFS =
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sig
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  val prove_casedist_thms : string list -> (int * (string * DatatypeAux.dtyp list *
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    (string * DatatypeAux.dtyp list) list)) list list -> (string * sort) list ->
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      thm -> theory attribute list -> theory -> theory * thm list
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  val prove_primrec_thms : bool -> string list -> (int * (string * DatatypeAux.dtyp list *
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    (string * DatatypeAux.dtyp list) list)) list list -> (string * sort) list ->
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      DatatypeAux.datatype_info Symtab.table -> thm list list -> thm list list ->
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        simpset -> thm -> theory -> theory * (string list * thm list)
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  val prove_case_thms : bool -> string list -> (int * (string * DatatypeAux.dtyp list *
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    (string * DatatypeAux.dtyp list) list)) list list -> (string * sort) list ->
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      string list -> thm list -> theory -> theory * (thm list list * string list)
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  val prove_split_thms : string list -> (int * (string * DatatypeAux.dtyp list *
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    (string * DatatypeAux.dtyp list) list)) list list -> (string * sort) list ->
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      thm list list -> thm list list -> thm list -> thm list list -> theory ->
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        theory * (thm * thm) list
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  val prove_size_thms : bool -> string list -> (int * (string * DatatypeAux.dtyp list *
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    (string * DatatypeAux.dtyp list) list)) list list -> (string * sort) list ->
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      string list -> thm list -> theory -> theory * thm list
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  val prove_nchotomys : string list -> (int * (string * DatatypeAux.dtyp list *
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    (string * DatatypeAux.dtyp list) list)) list list -> (string * sort) list ->
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      thm list -> theory -> theory * thm list
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  val prove_case_congs : string list -> (int * (string * DatatypeAux.dtyp list *
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    (string * DatatypeAux.dtyp list) list)) list list -> (string * sort) list ->
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      thm list -> thm list list -> theory -> theory * thm list
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end;
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structure DatatypeAbsProofs: DATATYPE_ABS_PROOFS =
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struct
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open DatatypeAux;
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val thin = read_instantiate_sg (Theory.sign_of Set.thy) [("V", "?X : ?Y")] thin_rl;
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val (_ $ (_ $ (_ $ (distinct_f $ _) $ _))) = hd (prems_of distinct_lemma);
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(************************ case distinction theorems ***************************)
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fun prove_casedist_thms new_type_names descr sorts induct case_names_exhausts thy =
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  let
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    val _ = message "Proving case distinction theorems ...";
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    val descr' = flat descr;
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    val recTs = get_rec_types descr' sorts;
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    val newTs = take (length (hd descr), recTs);
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    val {maxidx, ...} = rep_thm induct;
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    val induct_Ps = map head_of (HOLogic.dest_conj (HOLogic.dest_Trueprop (concl_of induct)));
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    fun prove_casedist_thm ((i, t), T) =
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      let
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        val dummyPs = map (fn (Var (_, Type (_, [T', T'']))) =>
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          Abs ("z", T', Const ("True", T''))) induct_Ps;
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        val P = Abs ("z", T, HOLogic.imp $ HOLogic.mk_eq (Var (("a", maxidx+1), T), Bound 0) $
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          Var (("P", 0), HOLogic.boolT))
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        val insts = take (i, dummyPs) @ (P::(drop (i + 1, dummyPs)));
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        val cert = cterm_of (Theory.sign_of thy);
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        val insts' = (map cert induct_Ps) ~~ (map cert insts);
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        val induct' = refl RS ((nth_elem (i,
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          split_conj_thm (cterm_instantiate insts' induct))) RSN (2, rev_mp))
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      in prove_goalw_cterm [] (cert t) (fn prems =>
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        [rtac induct' 1,
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         REPEAT (rtac TrueI 1),
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         REPEAT ((rtac impI 1) THEN (eresolve_tac prems 1)),
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         REPEAT (rtac TrueI 1)])
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      end;
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    val casedist_thms = map prove_casedist_thm ((0 upto (length newTs - 1)) ~~
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      (DatatypeProp.make_casedists descr sorts) ~~ newTs)
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  in thy |> store_thms_atts "exhaust" new_type_names (map single case_names_exhausts) casedist_thms end;
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(*************************** primrec combinators ******************************)
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fun prove_primrec_thms flat_names new_type_names descr sorts
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    (dt_info : datatype_info Symtab.table) constr_inject dist_rewrites dist_ss induct thy =
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  let
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    val _ = message "Constructing primrec combinators ...";
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    val fun_rel_comp_name = Sign.intern_const (sign_of Relation.thy) "fun_rel_comp";
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    val [fun_rel_comp_def, o_def] =
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      map (get_thm Relation.thy) ["fun_rel_comp_def", "o_def"];
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    val big_name = space_implode "_" new_type_names;
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    val thy0 = add_path flat_names big_name thy;
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    val descr' = flat descr;
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    val recTs = get_rec_types descr' sorts;
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    val used = foldr add_typ_tfree_names (recTs, []);
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    val newTs = take (length (hd descr), recTs);
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    val induct_Ps = map head_of (HOLogic.dest_conj (HOLogic.dest_Trueprop (concl_of induct)));
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    val big_rec_name' = big_name ^ "_rec_set";
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    val rec_set_names = map (Sign.full_name (Theory.sign_of thy0))
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      (if length descr' = 1 then [big_rec_name'] else
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        (map ((curry (op ^) (big_rec_name' ^ "_")) o string_of_int)
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          (1 upto (length descr'))));
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    val rec_result_Ts = map TFree (variantlist (replicate (length descr') "'t", used) ~~
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      replicate (length descr') HOLogic.termS);
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    val reccomb_fn_Ts = flat (map (fn (i, (_, _, constrs)) =>
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      map (fn (_, cargs) =>
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        let
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          val Ts = map (typ_of_dtyp descr' sorts) cargs;
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          val recs = filter (is_rec_type o fst) (cargs ~~ Ts);
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          fun mk_argT (DtRec k, _) = nth_elem (k, rec_result_Ts)
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            | mk_argT (DtType ("fun", [_, DtRec k]), Type ("fun", [T, _])) =
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               T --> nth_elem (k, rec_result_Ts);
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          val argTs = Ts @ map mk_argT recs
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        in argTs ---> nth_elem (i, rec_result_Ts)
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        end) constrs) descr');
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    val rec_set_Ts = map (fn (T1, T2) => reccomb_fn_Ts ---> HOLogic.mk_setT
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      (HOLogic.mk_prodT (T1, T2))) (recTs ~~ rec_result_Ts);
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    val rec_fns = map (uncurry (mk_Free "f"))
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      (reccomb_fn_Ts ~~ (1 upto (length reccomb_fn_Ts)));
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    val rec_sets = map (fn c => list_comb (Const c, rec_fns))
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      (rec_set_names ~~ rec_set_Ts);
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    (* introduction rules for graph of primrec function *)
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    fun make_rec_intr T set_name ((rec_intr_ts, l), (cname, cargs)) =
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      let
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        fun mk_prem ((dt, U), (j, k, prems, t1s, t2s)) =
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          let val free1 = mk_Free "x" U j
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          in (case (dt, U) of
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             (DtRec m, _) =>
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               let val free2 = mk_Free "y" (nth_elem (m, rec_result_Ts)) k
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               in (j + 1, k + 1, (HOLogic.mk_Trueprop (HOLogic.mk_mem
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                 (HOLogic.mk_prod (free1, free2), nth_elem (m, rec_sets))))::prems,
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                   free1::t1s, free2::t2s)
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               end
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           | (DtType ("fun", [_, DtRec m]), U' as Type ("fun", [T', _])) =>
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               let val free2 = mk_Free "y" (T' --> nth_elem (m, rec_result_Ts)) k
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               in (j + 1, k + 1, (HOLogic.mk_Trueprop (HOLogic.mk_mem (free2,
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                 Const (fun_rel_comp_name, [U', snd (strip_type (nth_elem (m, rec_set_Ts)))] --->
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                   HOLogic.mk_setT (T' --> nth_elem (m, rec_result_Ts))) $
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                     free1 $ nth_elem (m, rec_sets))))::prems, free1::t1s, free2::t2s)
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               end
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           | _ => (j + 1, k, prems, free1::t1s, t2s))
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          end;
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        val Ts = map (typ_of_dtyp descr' sorts) cargs;
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        val (_, _, prems, t1s, t2s) = foldr mk_prem (cargs ~~ Ts, (1, 1, [], [], []))
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      in (rec_intr_ts @ [Logic.list_implies (prems, HOLogic.mk_Trueprop (HOLogic.mk_mem
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        (HOLogic.mk_prod (list_comb (Const (cname, Ts ---> T), t1s),
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          list_comb (nth_elem (l, rec_fns), t1s @ t2s)), set_name)))], l + 1)
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      end;
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    val (rec_intr_ts, _) = foldl (fn (x, ((d, T), set_name)) =>
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      foldl (make_rec_intr T set_name) (x, #3 (snd d)))
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        (([], 0), descr' ~~ recTs ~~ rec_sets);
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    val (thy1, {intrs = rec_intrs, elims = rec_elims, ...}) =
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      setmp InductivePackage.quiet_mode (!quiet_mode)
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        (InductivePackage.add_inductive_i false true big_rec_name' false false true
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           rec_sets [] (map (fn x => (("", x), [])) rec_intr_ts) [fun_rel_comp_mono] []) thy0;
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    (* prove uniqueness and termination of primrec combinators *)
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    val _ = message "Proving termination and uniqueness of primrec functions ...";
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    fun mk_unique_tac ((tac, intrs), ((((i, (tname, _, constrs)), elim), T), T')) =
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      let
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        val distinct_tac = (etac Pair_inject 1) THEN
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          (if i < length newTs then
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             full_simp_tac (HOL_ss addsimps (nth_elem (i, dist_rewrites))) 1
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           else full_simp_tac dist_ss 1);
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        val inject = map (fn r => r RS iffD1)
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          (if i < length newTs then nth_elem (i, constr_inject)
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            else #inject (the (Symtab.lookup (dt_info, tname))));
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        fun mk_unique_constr_tac n ((tac, intr::intrs, j), (cname, cargs)) =
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          let
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            val k = length (filter is_rec_type cargs)
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          in (EVERY [DETERM tac,
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                REPEAT (dtac fun_rel_comp_unique 1),
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                REPEAT (etac ex1E 1), rtac ex1I 1,
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                DEPTH_SOLVE_1 (ares_tac [intr] 1),
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                REPEAT_DETERM_N k (etac thin 1),
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                etac elim 1,
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                REPEAT_DETERM_N j distinct_tac,
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                etac Pair_inject 1, TRY (dresolve_tac inject 1),
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                REPEAT (etac conjE 1), hyp_subst_tac 1,
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                REPEAT (etac allE 1),
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                REPEAT (dtac mp 1 THEN atac 1),
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                TRY (hyp_subst_tac 1),
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                rtac refl 1,
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                REPEAT_DETERM_N (n - j - 1) distinct_tac],
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              intrs, j + 1)
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          end;
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        val (tac', intrs', _) = foldl (mk_unique_constr_tac (length constrs))
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          ((tac, intrs, 0), constrs);
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      in (tac', intrs') end;
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    val rec_unique_thms =
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      let
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        val rec_unique_ts = map (fn (((set_t, T1), T2), i) =>
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          Const ("Ex1", (T2 --> HOLogic.boolT) --> HOLogic.boolT) $
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            absfree ("y", T2, HOLogic.mk_mem (HOLogic.mk_prod
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              (mk_Free "x" T1 i, Free ("y", T2)), set_t)))
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                (rec_sets ~~ recTs ~~ rec_result_Ts ~~ (1 upto length recTs));
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        val cert = cterm_of (Theory.sign_of thy1)
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        val insts = map (fn ((i, T), t) => absfree ("x" ^ (string_of_int i), T, t))
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          ((1 upto length recTs) ~~ recTs ~~ rec_unique_ts);
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        val induct' = cterm_instantiate ((map cert induct_Ps) ~~
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          (map cert insts)) induct;
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        val (tac, _) = foldl mk_unique_tac
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          ((rtac induct' 1, rec_intrs), descr' ~~ rec_elims ~~ recTs ~~ rec_result_Ts)
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      in split_conj_thm (prove_goalw_cterm []
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        (cert (HOLogic.mk_Trueprop (mk_conj rec_unique_ts))) (K [tac]))
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      end;
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    val rec_total_thms = map (fn r =>
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      r RS ex1_implies_ex RS (select_eq_Ex RS iffD2)) rec_unique_thms;
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    (* define primrec combinators *)
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    val big_reccomb_name = (space_implode "_" new_type_names) ^ "_rec";
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    val reccomb_names = map (Sign.full_name (Theory.sign_of thy1))
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      (if length descr' = 1 then [big_reccomb_name] else
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        (map ((curry (op ^) (big_reccomb_name ^ "_")) o string_of_int)
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          (1 upto (length descr'))));
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    val reccombs = map (fn ((name, T), T') => list_comb
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      (Const (name, reccomb_fn_Ts @ [T] ---> T'), rec_fns))
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        (reccomb_names ~~ recTs ~~ rec_result_Ts);
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    val (thy2, reccomb_defs) = thy1 |>
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      Theory.add_consts_i (map (fn ((name, T), T') =>
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        (Sign.base_name name, reccomb_fn_Ts @ [T] ---> T', NoSyn))
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          (reccomb_names ~~ recTs ~~ rec_result_Ts)) |>
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      (PureThy.add_defs_i o map Thm.no_attributes) (map (fn ((((name, comb), set), T), T') =>
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        ((Sign.base_name name) ^ "_def", Logic.mk_equals (comb, absfree ("x", T,
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           Const ("Eps", (T' --> HOLogic.boolT) --> T') $ absfree ("y", T',
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             HOLogic.mk_mem (HOLogic.mk_prod (Free ("x", T), Free ("y", T')), set))))))
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               (reccomb_names ~~ reccombs ~~ rec_sets ~~ recTs ~~ rec_result_Ts)) |>>
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      parent_path flat_names;
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    (* prove characteristic equations for primrec combinators *)
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    val _ = message "Proving characteristic theorems for primrec combinators ..."
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    val rec_thms = map (fn t => prove_goalw_cterm reccomb_defs
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      (cterm_of (Theory.sign_of thy2) t) (fn _ =>
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        [rtac select1_equality 1,
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         resolve_tac rec_unique_thms 1,
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         resolve_tac rec_intrs 1,
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         rewrite_goals_tac [o_def, fun_rel_comp_def],
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         REPEAT ((rtac CollectI 1 THEN rtac allI 1) ORELSE resolve_tac rec_total_thms 1)]))
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           (DatatypeProp.make_primrecs new_type_names descr sorts thy2)
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  in
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    thy2 |> Theory.add_path (space_implode "_" new_type_names) |>
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    PureThy.add_thmss [(("recs", rec_thms), [])] |>>
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    Theory.parent_path |> apsnd (pair reccomb_names o flat)
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  end;
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(***************************** case combinators *******************************)
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fun prove_case_thms flat_names new_type_names descr sorts reccomb_names primrec_thms thy =
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  let
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    val _ = message "Proving characteristic theorems for case combinators ...";
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    val thy1 = add_path flat_names (space_implode "_" new_type_names) thy;
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    val descr' = flat descr;
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    val recTs = get_rec_types descr' sorts;
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    val used = foldr add_typ_tfree_names (recTs, []);
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    val newTs = take (length (hd descr), recTs);
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    val T' = TFree (variant used "'t", HOLogic.termS);
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    fun mk_dummyT (DtRec _) = T'
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      | mk_dummyT (DtType ("fun", [T, _])) = typ_of_dtyp descr' sorts T --> T'
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    val case_dummy_fns = map (fn (_, (_, _, constrs)) => map (fn (_, cargs) =>
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      let
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        val Ts = map (typ_of_dtyp descr' sorts) cargs;
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        val Ts' = map mk_dummyT (filter is_rec_type cargs)
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      in Const ("arbitrary", Ts @ Ts' ---> T')
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      end) constrs) descr';
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    val case_names = map (fn s =>
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      Sign.full_name (Theory.sign_of thy1) (s ^ "_case")) new_type_names;
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    (* define case combinators via primrec combinators *)
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    val (case_defs, thy2) = foldl (fn ((defs, thy),
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      ((((i, (_, _, constrs)), T), name), recname)) =>
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        let
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          val (fns1, fns2) = ListPair.unzip (map (fn ((_, cargs), j) =>
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            let
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              val Ts = map (typ_of_dtyp descr' sorts) cargs;
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              val Ts' = Ts @ map mk_dummyT (filter is_rec_type cargs);
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              val frees' = map (uncurry (mk_Free "x")) (Ts' ~~ (1 upto length Ts'));
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              val frees = take (length cargs, frees');
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              val free = mk_Free "f" (Ts ---> T') j
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            in
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             (free, list_abs_free (map dest_Free frees',
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               list_comb (free, frees)))
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            end) (constrs ~~ (1 upto length constrs)));
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   333
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          val caseT = (map (snd o dest_Free) fns1) @ [T] ---> T';
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          val fns = (flat (take (i, case_dummy_fns))) @
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            fns2 @ (flat (drop (i + 1, case_dummy_fns)));
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          val reccomb = Const (recname, (map fastype_of fns) @ [T] ---> T');
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          val decl = (Sign.base_name name, caseT, NoSyn);
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          val def = ((Sign.base_name name) ^ "_def",
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            Logic.mk_equals (list_comb (Const (name, caseT), fns1),
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              list_comb (reccomb, (flat (take (i, case_dummy_fns))) @
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                fns2 @ (flat (drop (i + 1, case_dummy_fns))) )));
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          val (thy', [def_thm]) = thy |>
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            Theory.add_consts_i [decl] |> (PureThy.add_defs_i o map Thm.no_attributes) [def];
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        in (defs @ [def_thm], thy')
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        end) (([], thy1), (hd descr) ~~ newTs ~~ case_names ~~
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          (take (length newTs, reccomb_names)));
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   349
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    val case_thms = map (map (fn t => prove_goalw_cterm (case_defs @
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      (map mk_meta_eq primrec_thms)) (cterm_of (Theory.sign_of thy2) t)
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        (fn _ => [rtac refl 1])))
8477
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          (DatatypeProp.make_cases new_type_names descr sorts thy2)
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   354
8477
17231d71171a - Fixed bug in prove_casedist_thms (proof failed because of
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  in
17231d71171a - Fixed bug in prove_casedist_thms (proof failed because of
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   356
    thy2 |> Theory.add_trrules_i
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      (DatatypeProp.make_case_trrules new_type_names descr) |>
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   358
    parent_path flat_names |>
17231d71171a - Fixed bug in prove_casedist_thms (proof failed because of
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   359
    store_thmss "cases" new_type_names case_thms |>
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    apsnd (rpair case_names)
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   361
  end;
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   362
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   363
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   364
(******************************* case splitting *******************************)
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   365
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   366
fun prove_split_thms new_type_names descr sorts constr_inject dist_rewrites
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   367
    casedist_thms case_thms thy =
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   368
  let
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parents: 6422
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   369
    val _ = message "Proving equations for case splitting ...";
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   370
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   371
    val descr' = flat descr;
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   372
    val recTs = get_rec_types descr' sorts;
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   373
    val newTs = take (length (hd descr), recTs);
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   374
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   375
    fun prove_split_thms ((((((t1, t2), inject), dist_rewrites'),
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   376
        exhaustion), case_thms'), T) =
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   377
      let
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3d9fd50fcc43 Theory.sign_of;
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parents: 6092
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   378
        val cert = cterm_of (Theory.sign_of thy);
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   379
        val _ $ (_ $ lhs $ _) = hd (Logic.strip_assums_hyp (hd (prems_of exhaustion)));
0d3a168e4d44 New datatype definition package
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   380
        val exhaustion' = cterm_instantiate
0d3a168e4d44 New datatype definition package
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   381
          [(cert lhs, cert (Free ("x", T)))] exhaustion;
0d3a168e4d44 New datatype definition package
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   382
        val tacsf = K [rtac exhaustion' 1, ALLGOALS (asm_simp_tac
0d3a168e4d44 New datatype definition package
berghofe
parents:
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   383
          (HOL_ss addsimps (dist_rewrites' @ inject @ case_thms')))]
0d3a168e4d44 New datatype definition package
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   384
      in
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   385
        (prove_goalw_cterm [] (cert t1) tacsf,
0d3a168e4d44 New datatype definition package
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parents:
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   386
         prove_goalw_cterm [] (cert t2) tacsf)
0d3a168e4d44 New datatype definition package
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   387
      end;
0d3a168e4d44 New datatype definition package
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parents:
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   388
0d3a168e4d44 New datatype definition package
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   389
    val split_thm_pairs = map prove_split_thms
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   390
      ((DatatypeProp.make_splits new_type_names descr sorts thy) ~~ constr_inject ~~
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   391
        dist_rewrites ~~ casedist_thms ~~ case_thms ~~ newTs);
0d3a168e4d44 New datatype definition package
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parents:
diff changeset
   392
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   393
    val (split_thms, split_asm_thms) = ListPair.unzip split_thm_pairs
0d3a168e4d44 New datatype definition package
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parents:
diff changeset
   394
0d3a168e4d44 New datatype definition package
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parents:
diff changeset
   395
  in
8436
8a87fa482baf adapted to new PureThy.add_thms etc.;
wenzelm
parents: 8305
diff changeset
   396
    thy |> store_thms "split" new_type_names split_thms |>>>
8a87fa482baf adapted to new PureThy.add_thms etc.;
wenzelm
parents: 8305
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   397
      store_thms "split_asm" new_type_names split_asm_thms |> apsnd ListPair.zip
5177
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   398
  end;
0d3a168e4d44 New datatype definition package
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parents:
diff changeset
   399
0d3a168e4d44 New datatype definition package
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   400
(******************************* size functions *******************************)
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   401
5661
6ecb6ea25f19 - Changed structure of name spaces
berghofe
parents: 5578
diff changeset
   402
fun prove_size_thms flat_names new_type_names descr sorts reccomb_names primrec_thms thy =
7015
85be09eb136c - Datatype package now also supports arbitrarily branching datatypes
berghofe
parents: 6522
diff changeset
   403
  if exists (fn (_, (_, _, constrs)) => exists (fn (_, cargs) => exists
85be09eb136c - Datatype package now also supports arbitrarily branching datatypes
berghofe
parents: 6522
diff changeset
   404
    (fn (DtType ("fun", [_, DtRec _])) => true | _ => false) cargs) constrs) (flat descr)
85be09eb136c - Datatype package now also supports arbitrarily branching datatypes
berghofe
parents: 6522
diff changeset
   405
  then
85be09eb136c - Datatype package now also supports arbitrarily branching datatypes
berghofe
parents: 6522
diff changeset
   406
    (thy, [])
85be09eb136c - Datatype package now also supports arbitrarily branching datatypes
berghofe
parents: 6522
diff changeset
   407
  else
5177
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   408
  let
6427
fd36b2e7d80e tuned messages;
wenzelm
parents: 6422
diff changeset
   409
    val _ = message "Proving equations for size function ...";
5661
6ecb6ea25f19 - Changed structure of name spaces
berghofe
parents: 5578
diff changeset
   410
6ecb6ea25f19 - Changed structure of name spaces
berghofe
parents: 5578
diff changeset
   411
    val big_name = space_implode "_" new_type_names;
6ecb6ea25f19 - Changed structure of name spaces
berghofe
parents: 5578
diff changeset
   412
    val thy1 = add_path flat_names big_name thy;
5177
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   413
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   414
    val descr' = flat descr;
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   415
    val recTs = get_rec_types descr' sorts;
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   416
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   417
    val big_size_name = space_implode "_" new_type_names ^ "_size";
7015
85be09eb136c - Datatype package now also supports arbitrarily branching datatypes
berghofe
parents: 6522
diff changeset
   418
    val size_name = Sign.intern_const (Theory.sign_of (theory "Arith")) "size";
5177
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   419
    val size_names = replicate (length (hd descr)) size_name @
6394
3d9fd50fcc43 Theory.sign_of;
wenzelm
parents: 6092
diff changeset
   420
      map (Sign.full_name (Theory.sign_of thy1))
5177
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   421
        (if length (flat (tl descr)) = 1 then [big_size_name] else
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   422
          map (fn i => big_size_name ^ "_" ^ string_of_int i)
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   423
            (1 upto length (flat (tl descr))));
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   424
    val def_names = map (fn i => big_size_name ^ "_def_" ^ string_of_int i)
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   425
      (1 upto length recTs);
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   426
7704
9a6783fdb9a5 eliminated ap/app;
wenzelm
parents: 7228
diff changeset
   427
    fun plus (t1, t2) = Const ("op +", [HOLogic.natT, HOLogic.natT] ---> HOLogic.natT) $ t1 $ t2;
5177
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   428
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   429
    fun make_sizefun (_, cargs) =
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   430
      let
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   431
        val Ts = map (typ_of_dtyp descr' sorts) cargs;
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   432
        val k = length (filter is_rec_type cargs);
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   433
        val t = if k = 0 then HOLogic.zero else
7704
9a6783fdb9a5 eliminated ap/app;
wenzelm
parents: 7228
diff changeset
   434
          foldl1 plus (map Bound (k - 1 downto 0) @ [HOLogic.mk_nat 1])
5177
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   435
      in
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   436
        foldr (fn (T, t') => Abs ("x", T, t')) (Ts @ replicate k HOLogic.natT, t)
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   437
      end;
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   438
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   439
    val fs = flat (map (fn (_, (_, _, constrs)) => map make_sizefun constrs) descr');
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   440
    val fTs = map fastype_of fs;
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   441
8436
8a87fa482baf adapted to new PureThy.add_thms etc.;
wenzelm
parents: 8305
diff changeset
   442
    val (thy', size_def_thms) = thy1 |>
5177
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   443
      Theory.add_consts_i (map (fn (s, T) =>
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   444
        (Sign.base_name s, T --> HOLogic.natT, NoSyn))
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   445
          (drop (length (hd descr), size_names ~~ recTs))) |>
7904
2b551893583e proper handling of axioms / defs;
wenzelm
parents: 7704
diff changeset
   446
      (PureThy.add_defs_i o map Thm.no_attributes) (map (fn (((s, T), def_name), rec_name) =>
5177
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   447
        (def_name, Logic.mk_equals (Const (s, T --> HOLogic.natT),
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   448
          list_comb (Const (rec_name, fTs @ [T] ---> HOLogic.natT), fs))))
8436
8a87fa482baf adapted to new PureThy.add_thms etc.;
wenzelm
parents: 8305
diff changeset
   449
            (size_names ~~ recTs ~~ def_names ~~ reccomb_names)) |>>
5661
6ecb6ea25f19 - Changed structure of name spaces
berghofe
parents: 5578
diff changeset
   450
      parent_path flat_names;
5177
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   451
5553
ae42b36a50c2 renamed mk_meta_eq to mk_eq
oheimb
parents: 5303
diff changeset
   452
    val rewrites = size_def_thms @ map mk_meta_eq primrec_thms;
5177
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   453
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   454
    val size_thms = map (fn t => prove_goalw_cterm rewrites
6394
3d9fd50fcc43 Theory.sign_of;
wenzelm
parents: 6092
diff changeset
   455
      (cterm_of (Theory.sign_of thy') t) (fn _ => [rtac refl 1]))
5177
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   456
        (DatatypeProp.make_size new_type_names descr sorts thy')
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   457
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   458
  in
8477
17231d71171a - Fixed bug in prove_casedist_thms (proof failed because of
berghofe
parents: 8436
diff changeset
   459
    thy' |> Theory.add_path big_name |>
17231d71171a - Fixed bug in prove_casedist_thms (proof failed because of
berghofe
parents: 8436
diff changeset
   460
    PureThy.add_thmss [(("size", size_thms), [])] |>>
17231d71171a - Fixed bug in prove_casedist_thms (proof failed because of
berghofe
parents: 8436
diff changeset
   461
    Theory.parent_path |> apsnd flat
5177
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   462
  end;
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   463
8477
17231d71171a - Fixed bug in prove_casedist_thms (proof failed because of
berghofe
parents: 8436
diff changeset
   464
5177
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   465
(************************* additional theorems for TFL ************************)
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   466
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   467
fun prove_nchotomys new_type_names descr sorts casedist_thms thy =
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   468
  let
6427
fd36b2e7d80e tuned messages;
wenzelm
parents: 6422
diff changeset
   469
    val _ = message "Proving additional theorems for TFL ...";
5177
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   470
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   471
    fun prove_nchotomy (t, exhaustion) =
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   472
      let
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   473
        (* For goal i, select the correct disjunct to attack, then prove it *)
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   474
        fun tac i 0 = EVERY [TRY (rtac disjI1 i),
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   475
              hyp_subst_tac i, REPEAT (rtac exI i), rtac refl i]
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   476
          | tac i n = rtac disjI2 i THEN tac i (n - 1)
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   477
      in 
6394
3d9fd50fcc43 Theory.sign_of;
wenzelm
parents: 6092
diff changeset
   478
        prove_goalw_cterm [] (cterm_of (Theory.sign_of thy) t) (fn _ =>
5177
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   479
          [rtac allI 1,
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   480
           exh_tac (K exhaustion) 1,
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   481
           ALLGOALS (fn i => tac i (i-1))])
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   482
      end;
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   483
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   484
    val nchotomys =
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   485
      map prove_nchotomy (DatatypeProp.make_nchotomys descr sorts ~~ casedist_thms)
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   486
8436
8a87fa482baf adapted to new PureThy.add_thms etc.;
wenzelm
parents: 8305
diff changeset
   487
  in thy |> store_thms "nchotomy" new_type_names nchotomys end;
5177
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   488
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   489
fun prove_case_congs new_type_names descr sorts nchotomys case_thms thy =
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   490
  let
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   491
    fun prove_case_cong ((t, nchotomy), case_rewrites) =
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   492
      let
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   493
        val (Const ("==>", _) $ tm $ _) = t;
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   494
        val (Const ("Trueprop", _) $ (Const ("op =", _) $ _ $ Ma)) = tm;
6394
3d9fd50fcc43 Theory.sign_of;
wenzelm
parents: 6092
diff changeset
   495
        val cert = cterm_of (Theory.sign_of thy);
5177
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   496
        val nchotomy' = nchotomy RS spec;
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   497
        val nchotomy'' = cterm_instantiate
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   498
          [(cert (hd (add_term_vars (concl_of nchotomy', []))), cert Ma)] nchotomy'
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   499
      in
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   500
        prove_goalw_cterm [] (cert t) (fn prems => 
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   501
          let val simplify = asm_simp_tac (HOL_ss addsimps (prems @ case_rewrites))
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   502
          in [simp_tac (HOL_ss addsimps [hd prems]) 1,
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   503
              cut_facts_tac [nchotomy''] 1,
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   504
              REPEAT (etac disjE 1 THEN REPEAT (etac exE 1) THEN simplify 1),
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   505
              REPEAT (etac exE 1) THEN simplify 1 (* Get last disjunct *)]
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   506
          end)
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   507
      end;
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   508
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   509
    val case_congs = map prove_case_cong (DatatypeProp.make_case_congs
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   510
      new_type_names descr sorts thy ~~ nchotomys ~~ case_thms)
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   511
8436
8a87fa482baf adapted to new PureThy.add_thms etc.;
wenzelm
parents: 8305
diff changeset
   512
  in thy |> store_thms "case_cong" new_type_names case_congs end;
5177
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   513
0d3a168e4d44 New datatype definition package
berghofe
parents:
diff changeset
   514
end;