1 (* Title: HOL/Codatatype/Tools/bnf_fp_sugar.ML
2 Author: Jasmin Blanchette, TU Muenchen
5 Sugar for constructing LFPs and GFPs.
8 signature BNF_FP_SUGAR =
11 bool * ((((typ * sort) list * binding) * mixfix) * ((((binding * binding) *
12 (binding * typ) list) * (binding * term) list) * mixfix) list) list ->
13 local_theory -> local_theory
16 structure BNF_FP_Sugar : BNF_FP_SUGAR =
25 open BNF_FP_Sugar_Tactics
28 val coitersN = "coiters";
29 val corecsN = "corecs";
30 val disc_coitersN = "disc_coiters";
31 val disc_corecsN = "disc_corecs";
34 val sel_coitersN = "sel_coiters";
35 val sel_corecsN = "sel_corecs";
38 (map #1 xs, map #2 xs, map #3 xs, map #4 xs, map #5 xs, map #6 xs, map #7 xs, map #8 xs,
39 map #9 xs, map #10 xs, map #11 xs);
41 fun strip_map_type (Type (@{type_name fun}, [T as Type _, T'])) = strip_map_type T' |>> cons T
42 | strip_map_type T = ([], T);
44 fun typ_subst inst (T as Type (s, Ts)) =
45 (case AList.lookup (op =) inst T of
46 NONE => Type (s, map (typ_subst inst) Ts)
48 | typ_subst inst T = the_default T (AList.lookup (op =) inst T);
50 fun resort_tfree S (TFree (s, _)) = TFree (s, S);
52 fun retype_free T (Free (s, _)) = Free (s, T);
54 val lists_bmoc = fold (fn xs => fn t => Term.list_comb (t, xs));
56 fun mk_predT T = T --> HOLogic.boolT;
58 fun mk_id T = Const (@{const_name id}, T --> T);
60 fun mk_tupled_fun x f xs = HOLogic.tupled_lambda x (Term.list_comb (f, xs));
61 fun mk_uncurried_fun f xs = mk_tupled_fun (HOLogic.mk_tuple xs) f xs;
62 fun mk_uncurried2_fun f xss =
63 mk_tupled_fun (HOLogic.mk_tuple (map HOLogic.mk_tuple xss)) f (flat xss);
65 fun tick v f = Term.lambda v (HOLogic.mk_prod (v, f $ v));
67 fun tack z_name (c, v) f =
68 let val z = Free (z_name, mk_sumT (fastype_of v, fastype_of c)) in
69 Term.lambda z (mk_sum_case (Term.lambda v v, Term.lambda c (f $ c)) $ z)
72 fun cannot_merge_types () = error "Mutually recursive types must have the same type parameters";
74 fun merge_type_arg T T' = if T = T' then T else cannot_merge_types ();
76 fun merge_type_args (As, As') =
77 if length As = length As' then map2 merge_type_arg As As' else cannot_merge_types ();
79 fun type_args_constrained_of (((cAs, _), _), _) = cAs;
80 val type_args_of = map fst o type_args_constrained_of;
81 fun type_binder_of (((_, b), _), _) = b;
82 fun mixfix_of ((_, mx), _) = mx;
83 fun ctr_specs_of (_, ctr_specs) = ctr_specs;
85 fun disc_of ((((disc, _), _), _), _) = disc;
86 fun ctr_of ((((_, ctr), _), _), _) = ctr;
87 fun args_of (((_, args), _), _) = args;
88 fun defaults_of ((_, ds), _) = ds;
89 fun ctr_mixfix_of (_, mx) = mx;
91 fun define_datatype prepare_constraint prepare_typ prepare_term lfp (no_dests, specs)
94 (* TODO: sanity checks on arguments *)
96 val _ = if not lfp andalso no_dests then error "Cannot define destructor-less codatatypes"
101 fun prepare_type_arg (ty, c) =
102 let val TFree (s, _) = prepare_typ no_defs_lthy0 ty in
103 TFree (s, prepare_constraint no_defs_lthy0 c)
106 val Ass0 = map (map prepare_type_arg o type_args_constrained_of) specs;
107 val unsorted_Ass0 = map (map (resort_tfree HOLogic.typeS)) Ass0;
108 val unsorted_As = Library.foldr1 merge_type_args unsorted_Ass0;
110 val ((Bs, Cs), no_defs_lthy) =
112 |> fold (Variable.declare_typ o resort_tfree dummyS) unsorted_As
116 (* TODO: cleaner handling of fake contexts, without "background_theory" *)
117 (*the "perhaps o try" below helps gracefully handles the case where the new type is defined in a
118 locale and shadows an existing global type*)
120 Theory.copy #> fold (fn spec => perhaps (try (Sign.add_type no_defs_lthy
121 (type_binder_of spec, length (type_args_constrained_of spec), mixfix_of spec)))) specs;
122 val fake_lthy = Proof_Context.background_theory fake_thy no_defs_lthy;
125 Type (fst (Term.dest_Type (Proof_Context.read_type_name fake_lthy true (Binding.name_of b))),
128 val bs = map type_binder_of specs;
129 val fake_Ts = map mk_fake_T bs;
131 val mixfixes = map mixfix_of specs;
133 val _ = (case duplicates Binding.eq_name bs of [] => ()
134 | b :: _ => error ("Duplicate type name declaration " ^ quote (Binding.name_of b)));
136 val ctr_specss = map ctr_specs_of specs;
138 val disc_binderss = map (map disc_of) ctr_specss;
139 val ctr_binderss = map (map ctr_of) ctr_specss;
140 val ctr_argsss = map (map args_of) ctr_specss;
141 val ctr_mixfixess = map (map ctr_mixfix_of) ctr_specss;
143 val sel_bindersss = map (map (map fst)) ctr_argsss;
144 val fake_ctr_Tsss0 = map (map (map (prepare_typ fake_lthy o snd))) ctr_argsss;
145 val raw_sel_defaultsss = map (map defaults_of) ctr_specss;
147 val (Ass as As :: _) :: fake_ctr_Tsss =
148 burrow (burrow (Syntax.check_typs fake_lthy)) (Ass0 :: fake_ctr_Tsss0);
150 val _ = (case duplicates (op =) unsorted_As of [] => ()
151 | A :: _ => error ("Duplicate type parameter " ^
152 quote (Syntax.string_of_typ no_defs_lthy A)));
154 val rhs_As' = fold (fold (fold Term.add_tfreesT)) fake_ctr_Tsss [];
155 val _ = (case subtract (op =) (map dest_TFree As) rhs_As' of
157 | A' :: _ => error ("Extra type variables on rhs: " ^
158 quote (Syntax.string_of_typ no_defs_lthy (TFree A'))));
160 fun eq_fpT (T as Type (s, Us)) (Type (s', Us')) =
161 s = s' andalso (Us = Us' orelse error ("Illegal occurrence of recursive type " ^
162 quote (Syntax.string_of_typ fake_lthy T)))
163 | eq_fpT _ _ = false;
165 fun freeze_fp (T as Type (s, Us)) =
166 (case find_index (eq_fpT T) fake_Ts of ~1 => Type (s, map freeze_fp Us) | j => nth Bs j)
169 val ctr_TsssBs = map (map (map freeze_fp)) fake_ctr_Tsss;
170 val ctr_sum_prod_TsBs = map (mk_sumTN_balanced o map HOLogic.mk_tupleT) ctr_TsssBs;
173 map dest_TFree Bs ~~ map (Term.typ_subst_atomic (As ~~ unsorted_As)) ctr_sum_prod_TsBs;
175 val (pre_bnfs, ((unfs0, flds0, fp_iters0, fp_recs0, unf_flds, fld_unfs, fld_injects,
176 fp_iter_thms, fp_rec_thms), lthy)) =
177 fp_bnf (if lfp then bnf_lfp else bnf_gfp) bs mixfixes (map dest_TFree unsorted_As) fp_eqs
180 val add_nested_bnf_names =
182 fun add (Type (s, Ts)) ss =
183 let val (needs, ss') = fold_map add Ts ss in
184 if exists I needs then (true, insert (op =) s ss') else (false, ss')
186 | add T ss = (member (op =) As T, ss);
190 map_filter (bnf_of lthy) (fold (fold (fold add_nested_bnf_names)) ctr_TsssBs []);
192 val timer = time (Timer.startRealTimer ());
194 fun mk_unf_or_fld get_T Ts t =
195 let val Type (_, Ts0) = get_T (fastype_of t) in
196 Term.subst_atomic_types (Ts0 ~~ Ts) t
199 val mk_unf = mk_unf_or_fld domain_type;
200 val mk_fld = mk_unf_or_fld range_type;
202 val unfs = map (mk_unf As) unfs0;
203 val flds = map (mk_fld As) flds0;
205 val fpTs = map (domain_type o fastype_of) unfs;
207 val ctr_Tsss = map (map (map (Term.typ_subst_atomic (Bs ~~ fpTs)))) ctr_TsssBs;
208 val ns = map length ctr_Tsss;
209 val kss = map (fn n => 1 upto n) ns;
210 val mss = map (map length) ctr_Tsss;
211 val Css = map2 replicate ns Cs;
213 fun mk_iter_like Ts Us t =
215 val (binders, body) = strip_type (fastype_of t);
216 val (f_Us, prebody) = split_last binders;
217 val Type (_, Ts0) = if lfp then prebody else body;
218 val Us0 = distinct (op =) (map (if lfp then body_type else domain_type) f_Us);
220 Term.subst_atomic_types (Ts0 @ Us0 ~~ Ts @ Us) t
223 val fp_iters as fp_iter1 :: _ = map (mk_iter_like As Cs) fp_iters0;
224 val fp_recs as fp_rec1 :: _ = map (mk_iter_like As Cs) fp_recs0;
226 val fp_iter_fun_Ts = fst (split_last (binder_types (fastype_of fp_iter1)));
227 val fp_rec_fun_Ts = fst (split_last (binder_types (fastype_of fp_rec1)));
229 val ((iter_only as (gss, _, _), rec_only as (hss, _, _)),
230 (zs, cs, cpss, coiter_only as ((pgss, crgsss), _), corec_only as ((phss, cshsss), _))) =
234 map3 (fn n => fn ms => map2 dest_tupleT ms o dest_sumTN_balanced n o domain_type)
235 ns mss fp_iter_fun_Ts;
236 val g_Tss = map2 (map2 (curry (op --->))) y_Tsss Css;
238 val ((gss, ysss), _) =
240 |> mk_Freess "f" g_Tss
241 ||>> mk_Freesss "x" y_Tsss;
242 val yssss = map (map (map single)) ysss;
244 fun dest_rec_prodT (T as Type (@{type_name prod}, Us as [_, U])) =
245 if member (op =) Cs U then Us else [T]
246 | dest_rec_prodT T = [T];
249 map3 (fn n => fn ms => map2 (map dest_rec_prodT oo dest_tupleT) ms o
250 dest_sumTN_balanced n o domain_type) ns mss fp_rec_fun_Ts;
251 val h_Tss = map2 (map2 (fold_rev (curry (op --->)))) z_Tssss Css;
253 val hss = map2 (map2 retype_free) h_Tss gss;
254 val zssss_hd = map2 (map2 (map2 (retype_free o hd))) z_Tssss ysss;
257 |> mk_Freessss "y" (map (map (map tl)) z_Tssss);
258 val zssss = map2 (map2 (map2 cons)) zssss_hd zssss_tl;
260 (((gss, g_Tss, yssss), (hss, h_Tss, zssss)),
261 ([], [], [], (([], []), ([], [])), (([], []), ([], []))))
265 (*avoid "'a itself" arguments in coiterators and corecursors*)
266 val mss' = map (fn [0] => [1] | ms => ms) mss;
268 val p_Tss = map2 (fn n => replicate (Int.max (0, n - 1)) o mk_predT) ns Cs;
270 fun zip_predss_getterss qss fss = maps (op @) (qss ~~ fss);
272 fun zip_preds_predsss_gettersss [] [qss] [fss] = zip_predss_getterss qss fss
273 | zip_preds_predsss_gettersss (p :: ps) (qss :: qsss) (fss :: fsss) =
274 p :: zip_predss_getterss qss fss @ zip_preds_predsss_gettersss ps qsss fsss;
276 fun mk_types maybe_dest_sumT fun_Ts =
278 val f_sum_prod_Ts = map range_type fun_Ts;
279 val f_prod_Tss = map2 dest_sumTN_balanced ns f_sum_prod_Ts;
281 map3 (fn C => map2 (map (map (curry (op -->) C) o maybe_dest_sumT) oo dest_tupleT))
284 map (map (map (fn [_] => [] | [_, C] => [mk_predT (domain_type C)]))) f_Tssss;
285 val pf_Tss = map3 zip_preds_predsss_gettersss p_Tss q_Tssss f_Tssss;
286 in (q_Tssss, f_sum_prod_Ts, f_Tssss, pf_Tss) end;
288 val (r_Tssss, g_sum_prod_Ts, g_Tssss, pg_Tss) = mk_types single fp_iter_fun_Ts;
290 val ((((Free (z, _), cs), pss), gssss), _) =
292 |> yield_singleton (mk_Frees "z") dummyT
294 ||>> mk_Freess "p" p_Tss
295 ||>> mk_Freessss "g" g_Tssss;
296 val rssss = map (map (map (fn [] => []))) r_Tssss;
298 fun dest_corec_sumT (T as Type (@{type_name sum}, Us as [_, U])) =
299 if member (op =) Cs U then Us else [T]
300 | dest_corec_sumT T = [T];
302 val (s_Tssss, h_sum_prod_Ts, h_Tssss, ph_Tss) = mk_types dest_corec_sumT fp_rec_fun_Ts;
304 val hssss_hd = map2 (map2 (map2 (fn T :: _ => fn [g] => retype_free T g))) h_Tssss gssss;
305 val ((sssss, hssss_tl), _) =
307 |> mk_Freessss "q" s_Tssss
308 ||>> mk_Freessss "h" (map (map (map tl)) h_Tssss);
309 val hssss = map2 (map2 (map2 cons)) hssss_hd hssss_tl;
311 val cpss = map2 (fn c => map (fn p => p $ c)) cs pss;
313 fun mk_preds_getters_join [] [cf] = cf
314 | mk_preds_getters_join [cq] [cf, cf'] =
315 mk_If cq (mk_Inl (fastype_of cf') cf) (mk_Inr (fastype_of cf) cf');
317 fun mk_terms qssss fssss =
319 val pfss = map3 zip_preds_predsss_gettersss pss qssss fssss;
320 val cqssss = map2 (fn c => map (map (map (fn f => f $ c)))) cs qssss;
321 val cfssss = map2 (fn c => map (map (map (fn f => f $ c)))) cs fssss;
322 val cqfsss = map2 (map2 (map2 mk_preds_getters_join)) cqssss cfssss;
323 in (pfss, cqfsss) end;
325 ((([], [], []), ([], [], [])),
326 ([z], cs, cpss, (mk_terms rssss gssss, (g_sum_prod_Ts, pg_Tss)),
327 (mk_terms sssss hssss, (h_sum_prod_Ts, ph_Tss))))
330 fun define_ctrs_case_for_type ((((((((((((((((((b, fpT), C), fld), unf), fp_iter), fp_rec),
331 fld_unf), unf_fld), fld_inject), n), ks), ms), ctr_binders), ctr_mixfixes), ctr_Tss),
332 disc_binders), sel_binderss), raw_sel_defaultss) no_defs_lthy =
334 val unfT = domain_type (fastype_of fld);
335 val ctr_prod_Ts = map HOLogic.mk_tupleT ctr_Tss;
336 val ctr_sum_prod_T = mk_sumTN_balanced ctr_prod_Ts;
337 val case_Ts = map (fn Ts => Ts ---> C) ctr_Tss;
339 val ((((u, v), fs), xss), _) =
341 |> yield_singleton (mk_Frees "u") unfT
342 ||>> yield_singleton (mk_Frees "v") fpT
343 ||>> mk_Frees "f" case_Ts
344 ||>> mk_Freess "x" ctr_Tss;
347 map2 (fn k => fn xs => fold_rev Term.lambda xs (fld $
348 mk_InN_balanced ctr_sum_prod_T n (HOLogic.mk_tuple xs) k)) ks xss;
350 val case_binder = Binding.suffix_name ("_" ^ caseN) b;
353 fold_rev Term.lambda (fs @ [v])
354 (mk_sum_caseN_balanced (map2 mk_uncurried_fun fs xss) $ (unf $ v));
356 val ((raw_case :: raw_ctrs, raw_case_def :: raw_ctr_defs), (lthy', lthy)) = no_defs_lthy
357 |> apfst split_list o fold_map3 (fn b => fn mx => fn rhs =>
358 Local_Theory.define ((b, mx), ((Thm.def_binding b, []), rhs)) #>> apsnd snd)
359 (case_binder :: ctr_binders) (NoSyn :: ctr_mixfixes) (case_rhs :: ctr_rhss)
360 ||> `Local_Theory.restore;
362 (*transforms defined frees into consts (and more)*)
363 val phi = Proof_Context.export_morphism lthy lthy';
365 val ctr_defs = map (Morphism.thm phi) raw_ctr_defs;
366 val case_def = Morphism.thm phi raw_case_def;
368 val ctrs0 = map (Morphism.term phi) raw_ctrs;
369 val casex0 = Morphism.term phi raw_case;
371 val ctrs = map (mk_ctr As) ctrs0;
373 fun exhaust_tac {context = ctxt, ...} =
375 val fld_iff_unf_thm =
378 fold_rev Logic.all [u, v]
379 (mk_Trueprop_eq (HOLogic.mk_eq (v, fld $ u), HOLogic.mk_eq (unf $ v, u)));
381 Skip_Proof.prove lthy [] [] goal (fn {context = ctxt, ...} =>
382 mk_fld_iff_unf_tac ctxt (map (SOME o certifyT lthy) [unfT, fpT])
383 (certify lthy fld) (certify lthy unf) fld_unf unf_fld)
384 |> Thm.close_derivation
389 Local_Defs.unfold lthy @{thms all_unit_eq}
390 (Drule.instantiate' (map (SOME o certifyT lthy) ctr_prod_Ts) []
391 (mk_sumEN_balanced n))
394 mk_exhaust_tac ctxt n ctr_defs fld_iff_unf_thm sumEN_thm'
398 map2 (fn 0 => K [] | _ => fn ctr_def => [fn {context = ctxt, ...} =>
399 mk_inject_tac ctxt ctr_def fld_inject]) ms ctr_defs;
401 val half_distinct_tacss =
402 map (map (fn (def, def') => fn {context = ctxt, ...} =>
403 mk_half_distinct_tac ctxt fld_inject [def, def'])) (mk_half_pairss ctr_defs);
406 map3 (fn k => fn m => fn ctr_def => fn {context = ctxt, ...} =>
407 mk_case_tac ctxt n k m case_def ctr_def unf_fld) ks ms ctr_defs;
409 val tacss = [exhaust_tac] :: inject_tacss @ half_distinct_tacss @ [case_tacs];
411 fun define_iter_rec ((selss0, discIs, sel_thmss), no_defs_lthy) =
413 val fpT_to_C = fpT --> C;
415 fun generate_iter_like (suf, fp_iter_like, (fss, f_Tss, xssss)) =
417 val res_T = fold_rev (curry (op --->)) f_Tss fpT_to_C;
419 val binder = Binding.suffix_name ("_" ^ suf) b;
422 mk_Trueprop_eq (lists_bmoc fss (Free (Binding.name_of binder, res_T)),
423 Term.list_comb (fp_iter_like,
424 map2 (mk_sum_caseN_balanced oo map2 mk_uncurried2_fun) fss xssss));
425 in (binder, spec) end;
427 val iter_like_bundles =
428 [(iterN, fp_iter, iter_only),
429 (recN, fp_rec, rec_only)];
431 val (binders, specs) = map generate_iter_like iter_like_bundles |> split_list;
433 val ((csts, defs), (lthy', lthy)) = no_defs_lthy
434 |> apfst split_list o fold_map2 (fn b => fn spec =>
435 Specification.definition (SOME (b, NONE, NoSyn), ((Thm.def_binding b, []), spec))
436 #>> apsnd snd) binders specs
437 ||> `Local_Theory.restore;
439 (*transforms defined frees into consts (and more)*)
440 val phi = Proof_Context.export_morphism lthy lthy';
442 val [iter_def, rec_def] = map (Morphism.thm phi) defs;
444 val [iter, recx] = map (mk_iter_like As Cs o Morphism.term phi) csts;
446 ((ctrs, selss0, iter, recx, v, xss, ctr_defs, discIs, sel_thmss, iter_def, rec_def),
450 fun define_coiter_corec ((selss0, discIs, sel_thmss), no_defs_lthy) =
452 val B_to_fpT = C --> fpT;
454 fun mk_preds_getterss_join c n cps sum_prod_T cqfss =
455 Term.lambda c (mk_IfN sum_prod_T cps
456 (map2 (mk_InN_balanced sum_prod_T n) (map HOLogic.mk_tuple cqfss) (1 upto n)));
458 fun generate_coiter_like (suf, fp_iter_like, ((pfss, cqfsss), (f_sum_prod_Ts,
461 val res_T = fold_rev (curry (op --->)) pf_Tss B_to_fpT;
463 val binder = Binding.suffix_name ("_" ^ suf) b;
466 mk_Trueprop_eq (lists_bmoc pfss (Free (Binding.name_of binder, res_T)),
467 Term.list_comb (fp_iter_like,
468 map5 mk_preds_getterss_join cs ns cpss f_sum_prod_Ts cqfsss));
469 in (binder, spec) end;
471 val coiter_like_bundles =
472 [(coiterN, fp_iter, coiter_only),
473 (corecN, fp_rec, corec_only)];
475 val (binders, specs) = map generate_coiter_like coiter_like_bundles |> split_list;
477 val ((csts, defs), (lthy', lthy)) = no_defs_lthy
478 |> apfst split_list o fold_map2 (fn b => fn spec =>
479 Specification.definition (SOME (b, NONE, NoSyn), ((Thm.def_binding b, []), spec))
480 #>> apsnd snd) binders specs
481 ||> `Local_Theory.restore;
483 (*transforms defined frees into consts (and more)*)
484 val phi = Proof_Context.export_morphism lthy lthy';
486 val [coiter_def, corec_def] = map (Morphism.thm phi) defs;
488 val [coiter, corec] = map (mk_iter_like As Cs o Morphism.term phi) csts;
490 ((ctrs, selss0, coiter, corec, v, xss, ctr_defs, discIs, sel_thmss, coiter_def,
495 let val sel_defaultss = map (map (apsnd (prepare_term lthy))) raw_sel_defaultss in
496 wrap_datatype tacss (((no_dests, ctrs0), casex0), (disc_binders, (sel_binderss,
497 sel_defaultss))) lthy
500 val define_iter_likes = if lfp then define_iter_rec else define_coiter_corec;
502 ((wrap, define_iter_likes), lthy')
505 val pre_map_defs = map map_def_of_bnf pre_bnfs;
506 val map_ids = map map_id_of_bnf nested_bnfs;
509 let val (Type (_, Ts0), Type (_, Us0)) = strip_map_type (fastype_of t) |>> List.last in
510 Term.subst_atomic_types (Ts0 @ Us0 ~~ Ts @ Us) t
513 fun build_map build_arg (Type (s, Ts)) (Type (_, Us)) =
515 val map0 = map_of_bnf (the (bnf_of lthy s));
516 val mapx = mk_map Ts Us map0;
517 val TUs = map dest_funT (fst (split_last (fst (strip_map_type (fastype_of mapx)))));
518 val args = map build_arg TUs;
519 in Term.list_comb (mapx, args) end;
521 fun derive_iter_rec_thms_for_types ((ctrss, _, iters, recs, vs, xsss, ctr_defss, _, _, iter_defs,
524 val xctrss = map2 (map2 (curry Term.list_comb)) ctrss xsss;
525 val giters = map (lists_bmoc gss) iters;
526 val hrecs = map (lists_bmoc hss) recs;
528 val (iter_thmss, rec_thmss) =
530 fun mk_goal_iter_like fss fiter_like xctr f xs fxs =
531 fold_rev (fold_rev Logic.all) (xs :: fss)
532 (mk_Trueprop_eq (fiter_like $ xctr, Term.list_comb (f, fxs)));
534 fun build_call fiter_likes maybe_tick (T, U) =
538 (case find_index (curry (op =) T) fpTs of
539 ~1 => build_map (build_call fiter_likes maybe_tick) T U
540 | j => maybe_tick (nth vs j) (nth fiter_likes j));
542 fun mk_U maybe_mk_prodT =
543 typ_subst (map2 (fn fpT => fn C => (fpT, maybe_mk_prodT fpT C)) fpTs Cs);
545 fun repair_calls fiter_likes maybe_cons maybe_tick maybe_mk_prodT (x as Free (_, T)) =
546 if member (op =) fpTs T then
547 maybe_cons x [build_call fiter_likes (K I) (T, mk_U (K I) T) $ x]
548 else if exists_subtype (member (op =) fpTs) T then
549 [build_call fiter_likes maybe_tick (T, mk_U maybe_mk_prodT T) $ x]
553 val gxsss = map (map (maps (repair_calls giters (K I) (K I) (K I)))) xsss;
555 map (map (maps (repair_calls hrecs cons tick (curry HOLogic.mk_prodT)))) xsss;
557 val goal_iterss = map5 (map4 o mk_goal_iter_like gss) giters xctrss gss xsss gxsss;
558 val goal_recss = map5 (map4 o mk_goal_iter_like hss) hrecs xctrss hss xsss hxsss;
561 map2 (map o mk_iter_like_tac pre_map_defs map_ids iter_defs) fp_iter_thms ctr_defss;
563 map2 (map o mk_iter_like_tac pre_map_defs map_ids rec_defs) fp_rec_thms ctr_defss;
565 (map2 (map2 (fn goal => fn tac => Skip_Proof.prove lthy [] [] goal (tac o #context)))
566 goal_iterss iter_tacss,
567 map2 (map2 (fn goal => fn tac => Skip_Proof.prove lthy [] [] goal (tac o #context)))
568 goal_recss rec_tacss)
572 [(itersN, iter_thmss),
574 |> maps (fn (thmN, thmss) =>
575 map2 (fn b => fn thms =>
576 ((Binding.qualify true (Binding.name_of b) (Binding.name thmN), []), [(thms, [])]))
579 lthy |> Local_Theory.notes notes |> snd
582 fun derive_coiter_corec_thms_for_types ((ctrss, selsss, coiters, corecs, vs, _, ctr_defss,
583 discIss, sel_thmsss, coiter_defs, corec_defs), lthy) =
585 val z = the_single zs;
587 val gcoiters = map (lists_bmoc pgss) coiters;
588 val hcorecs = map (lists_bmoc phss) corecs;
590 val (coiter_thmss, corec_thmss) =
592 fun mk_goal_cond pos = HOLogic.mk_Trueprop o (not pos ? HOLogic.mk_not);
594 fun mk_goal_coiter_like pfss c cps fcoiter_like n k ctr m cfs' =
595 fold_rev (fold_rev Logic.all) ([c] :: pfss)
596 (Logic.list_implies (seq_conds mk_goal_cond n k cps,
597 mk_Trueprop_eq (fcoiter_like $ c, Term.list_comb (ctr, take m cfs'))));
599 fun build_call fiter_likes maybe_tack (T, U) =
603 (case find_index (curry (op =) U) fpTs of
604 ~1 => build_map (build_call fiter_likes maybe_tack) T U
605 | j => maybe_tack (nth cs j, nth vs j) (nth fiter_likes j));
607 fun mk_U maybe_mk_sumT =
608 typ_subst (map2 (fn C => fn fpT => (maybe_mk_sumT fpT C, fpT)) Cs fpTs);
610 fun repair_calls fiter_likes maybe_mk_sumT maybe_tack cqf =
611 let val T = fastype_of cqf in
612 if exists_subtype (member (op =) Cs) T then
613 build_call fiter_likes maybe_tack (T, mk_U maybe_mk_sumT T) $ cqf
618 val crgsss' = map (map (map (repair_calls gcoiters (K I) (K I)))) crgsss;
619 val cshsss' = map (map (map (repair_calls hcorecs (curry mk_sumT) (tack z)))) cshsss;
622 map8 (map4 oooo mk_goal_coiter_like pgss) cs cpss gcoiters ns kss ctrss mss crgsss';
624 map8 (map4 oooo mk_goal_coiter_like phss) cs cpss hcorecs ns kss ctrss mss cshsss';
627 map3 (map oo mk_coiter_like_tac coiter_defs map_ids) fp_iter_thms pre_map_defs
630 map3 (map oo mk_coiter_like_tac corec_defs map_ids) fp_rec_thms pre_map_defs
633 (map2 (map2 (fn goal => fn tac =>
634 Skip_Proof.prove lthy [] [] goal (tac o #context) |> Thm.close_derivation))
635 goal_coiterss coiter_tacss,
636 map2 (map2 (fn goal => fn tac =>
637 Skip_Proof.prove lthy [] [] goal (tac o #context)
638 |> Local_Defs.unfold lthy @{thms sum_case_if} |> Thm.close_derivation))
639 goal_corecss corec_tacss)
642 fun mk_disc_coiter_like_thms [_] = K []
643 | mk_disc_coiter_like_thms thms = map2 (curry (op RS)) thms;
645 val disc_coiter_thmss = map2 mk_disc_coiter_like_thms coiter_thmss discIss;
646 val disc_corec_thmss = map2 mk_disc_coiter_like_thms corec_thmss discIss;
648 fun mk_sel_coiter_like_thm coiter_like_thm sel0 sel_thm =
650 val (domT, ranT) = dest_funT (fastype_of sel0);
652 Drule.instantiate' (map (SOME o certifyT lthy) [domT, ranT])
653 [NONE, NONE, SOME (certify lthy sel0)] arg_cong
654 |> Thm.varifyT_global;
655 val sel_thm' = sel_thm RSN (2, trans);
657 coiter_like_thm RS arg_cong' RS sel_thm'
660 val sel_coiter_thmsss =
661 map3 (map3 (map2 o mk_sel_coiter_like_thm)) coiter_thmss selsss sel_thmsss;
662 val sel_corec_thmsss =
663 map3 (map3 (map2 o mk_sel_coiter_like_thm)) corec_thmss selsss sel_thmsss;
666 [(coitersN, coiter_thmss),
667 (disc_coitersN, disc_coiter_thmss),
668 (sel_coitersN, map flat sel_coiter_thmsss),
669 (corecsN, corec_thmss),
670 (disc_corecsN, disc_corec_thmss),
671 (sel_corecsN, map flat sel_corec_thmsss)]
672 |> maps (fn (thmN, thmss) =>
673 map_filter (fn (_, []) => NONE | (b, thms) =>
674 SOME ((Binding.qualify true (Binding.name_of b) (Binding.name thmN), []),
675 [(thms, [])])) (bs ~~ thmss));
677 lthy |> Local_Theory.notes notes |> snd
680 fun wrap_types_and_define_iter_likes ((wraps, define_iter_likess), lthy) =
681 fold_map2 (curry (op o)) define_iter_likess wraps lthy |>> split_list11
684 |> fold_map define_ctrs_case_for_type (bs ~~ fpTs ~~ Cs ~~ flds ~~ unfs ~~ fp_iters ~~
685 fp_recs ~~ fld_unfs ~~ unf_flds ~~ fld_injects ~~ ns ~~ kss ~~ mss ~~ ctr_binderss ~~
686 ctr_mixfixess ~~ ctr_Tsss ~~ disc_binderss ~~ sel_bindersss ~~ raw_sel_defaultsss)
687 |>> split_list |> wrap_types_and_define_iter_likes
688 |> (if lfp then derive_iter_rec_thms_for_types else derive_coiter_corec_thms_for_types);
690 val timer = time (timer ("Constructors, discriminators, selectors, etc., for the new " ^
691 (if lfp then "" else "co") ^ "datatype"));
696 val datatyp = define_datatype (K I) (K I) (K I);
698 val datatype_cmd = define_datatype Typedecl.read_constraint Syntax.parse_typ Syntax.read_term;
700 val parse_opt_binding_colon = Scan.optional (Parse.binding --| @{keyword ":"}) no_binder
703 @{keyword "("} |-- parse_opt_binding_colon -- Parse.typ --| @{keyword ")"} ||
704 (Parse.typ >> pair no_binder);
707 @{keyword "("} |-- @{keyword "defaults"} |-- Scan.repeat parse_bound_term --| @{keyword ")"};
709 val parse_single_spec =
710 Parse.type_args_constrained -- Parse.binding -- Parse.opt_mixfix --
711 (@{keyword "="} |-- Parse.enum1 "|" (parse_opt_binding_colon -- Parse.binding --
712 Scan.repeat parse_ctr_arg -- Scan.optional parse_defaults [] -- Parse.opt_mixfix));
714 val parse_datatype = parse_wrap_options -- Parse.and_list1 parse_single_spec;
717 Outer_Syntax.local_theory @{command_spec "data"} "define BNF-based inductive datatypes"
718 (parse_datatype >> datatype_cmd true);
721 Outer_Syntax.local_theory @{command_spec "codata"} "define BNF-based coinductive datatypes"
722 (parse_datatype >> datatype_cmd false);