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 (mixfix list -> (string * sort) list option -> binding list -> typ list * typ list list ->
12 BNF_Def.BNF list -> local_theory ->
13 (term list * term list * term list * term list * thm * thm list * thm list * thm list *
14 thm list * thm list) * local_theory) ->
15 bool * ((((typ * sort) list * binding) * mixfix) * ((((binding * binding) *
16 (binding * typ) list) * (binding * term) list) * mixfix) list) list ->
17 local_theory -> local_theory
18 val parse_datatype_cmd: bool ->
19 (mixfix list -> (string * sort) list option -> binding list -> typ list * typ list list ->
20 BNF_Def.BNF list -> local_theory ->
21 (term list * term list * term list * term list * thm * thm list * thm list * thm list *
22 thm list * thm list) * local_theory) ->
23 (local_theory -> local_theory) parser
26 structure BNF_FP_Sugar : BNF_FP_SUGAR =
33 open BNF_FP_Sugar_Tactics
35 val simp_attrs = @{attributes [simp]};
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 resort_tfree S (TFree (s, _)) = TFree (s, S);
46 fun typ_subst inst (T as Type (s, Ts)) =
47 (case AList.lookup (op =) inst T of
48 NONE => Type (s, map (typ_subst inst) Ts)
50 | typ_subst inst T = the_default T (AList.lookup (op =) inst T);
52 val lists_bmoc = fold (fn xs => fn t => Term.list_comb (t, xs));
54 fun mk_id T = Const (@{const_name id}, T --> T);
56 fun mk_tupled_fun x f xs = HOLogic.tupled_lambda x (Term.list_comb (f, xs));
57 fun mk_uncurried_fun f xs = mk_tupled_fun (HOLogic.mk_tuple xs) f xs;
58 fun mk_uncurried2_fun f xss =
59 mk_tupled_fun (HOLogic.mk_tuple (map HOLogic.mk_tuple xss)) f (flat xss);
61 fun tick v f = Term.lambda v (HOLogic.mk_prod (v, f $ v));
63 fun tack z_name (c, v) f =
64 let val z = Free (z_name, mk_sumT (fastype_of v, fastype_of c)) in
65 Term.lambda z (mk_sum_case (Term.lambda v v, Term.lambda c (f $ c)) $ z)
68 fun cannot_merge_types () = error "Mutually recursive types must have the same type parameters";
70 fun merge_type_arg T T' = if T = T' then T else cannot_merge_types ();
72 fun merge_type_args (As, As') =
73 if length As = length As' then map2 merge_type_arg As As' else cannot_merge_types ();
75 fun type_args_constrained_of (((cAs, _), _), _) = cAs;
76 fun type_binding_of (((_, b), _), _) = b;
77 fun mixfix_of ((_, mx), _) = mx;
78 fun ctr_specs_of (_, ctr_specs) = ctr_specs;
80 fun disc_of ((((disc, _), _), _), _) = disc;
81 fun ctr_of ((((_, ctr), _), _), _) = ctr;
82 fun args_of (((_, args), _), _) = args;
83 fun defaults_of ((_, ds), _) = ds;
84 fun ctr_mixfix_of (_, mx) = mx;
86 fun define_datatype prepare_constraint prepare_typ prepare_term lfp construct (no_dests, specs)
89 (* TODO: sanity checks on arguments *)
91 val _ = if not lfp andalso no_dests then error "Cannot define destructor-less codatatypes"
95 val fp_bs = map type_binding_of specs;
96 val fp_common_name = mk_common_name fp_bs;
98 fun prepare_type_arg (ty, c) =
99 let val TFree (s, _) = prepare_typ no_defs_lthy0 ty in
100 TFree (s, prepare_constraint no_defs_lthy0 c)
103 val Ass0 = map (map prepare_type_arg o type_args_constrained_of) specs;
104 val unsorted_Ass0 = map (map (resort_tfree HOLogic.typeS)) Ass0;
105 val unsorted_As = Library.foldr1 merge_type_args unsorted_Ass0;
107 val (((Bs, Cs), vs'), no_defs_lthy) =
109 |> fold (Variable.declare_typ o resort_tfree dummyS) unsorted_As
112 ||>> Variable.variant_fixes (map Binding.name_of fp_bs);
114 (* TODO: cleaner handling of fake contexts, without "background_theory" *)
115 (*the "perhaps o try" below helps gracefully handles the case where the new type is defined in a
116 locale and shadows an existing global type*)
118 Theory.copy #> fold (fn spec => perhaps (try (Sign.add_type no_defs_lthy
119 (type_binding_of spec, length (type_args_constrained_of spec), mixfix_of spec)))) specs;
120 val fake_lthy = Proof_Context.background_theory fake_thy no_defs_lthy;
123 Type (fst (Term.dest_Type (Proof_Context.read_type_name fake_lthy true (Binding.name_of b))),
126 val fake_Ts = map mk_fake_T fp_bs;
128 val mixfixes = map mixfix_of specs;
130 val _ = (case duplicates Binding.eq_name fp_bs of [] => ()
131 | b :: _ => error ("Duplicate type name declaration " ^ quote (Binding.name_of b)));
133 val ctr_specss = map ctr_specs_of specs;
135 val disc_bindingss = map (map disc_of) ctr_specss;
137 map2 (fn fp_b => map (Binding.qualify false (Binding.name_of fp_b) o ctr_of))
139 val ctr_argsss = map (map args_of) ctr_specss;
140 val ctr_mixfixess = map (map ctr_mixfix_of) ctr_specss;
142 val sel_bindingsss = map (map (map fst)) ctr_argsss;
143 val fake_ctr_Tsss0 = map (map (map (prepare_typ fake_lthy o snd))) ctr_argsss;
144 val raw_sel_defaultsss = map (map defaults_of) ctr_specss;
146 val (As :: _) :: fake_ctr_Tsss =
147 burrow (burrow (Syntax.check_typs fake_lthy)) (Ass0 :: fake_ctr_Tsss0);
149 val _ = (case duplicates (op =) unsorted_As of [] => ()
150 | A :: _ => error ("Duplicate type parameter " ^
151 quote (Syntax.string_of_typ no_defs_lthy A)));
153 val rhs_As' = fold (fold (fold Term.add_tfreesT)) fake_ctr_Tsss [];
154 val _ = (case subtract (op =) (map dest_TFree As) rhs_As' of
156 | A' :: _ => error ("Extra type variable on right-hand side: " ^
157 quote (Syntax.string_of_typ no_defs_lthy (TFree A'))));
159 fun eq_fpT (T as Type (s, Us)) (Type (s', Us')) =
160 s = s' andalso (Us = Us' orelse error ("Illegal occurrence of recursive type " ^
161 quote (Syntax.string_of_typ fake_lthy T)))
162 | eq_fpT _ _ = false;
164 fun freeze_fp (T as Type (s, Us)) =
165 (case find_index (eq_fpT T) fake_Ts of ~1 => Type (s, map freeze_fp Us) | j => nth Bs j)
168 val ctr_TsssBs = map (map (map freeze_fp)) fake_ctr_Tsss;
169 val ctr_sum_prod_TsBs = map (mk_sumTN_balanced o map HOLogic.mk_tupleT) ctr_TsssBs;
172 map dest_TFree Bs ~~ map (Term.typ_subst_atomic (As ~~ unsorted_As)) ctr_sum_prod_TsBs;
174 val (pre_bnfs, ((unfs0, flds0, fp_iters0, fp_recs0, fp_induct, unf_flds, fld_unfs, fld_injects,
175 fp_iter_thms, fp_rec_thms), lthy)) =
176 fp_bnf construct fp_bs mixfixes (map dest_TFree unsorted_As) fp_eqs no_defs_lthy0;
178 fun add_nesty_bnf_names Us =
180 fun add (Type (s, Ts)) ss =
181 let val (needs, ss') = fold_map add Ts ss in
182 if exists I needs then (true, insert (op =) s ss') else (false, ss')
184 | add T ss = (member (op =) Us T, ss);
188 map_filter (bnf_of lthy) (fold (fold (fold (add_nesty_bnf_names Us))) ctr_TsssBs []);
190 val nesting_bnfs = nesty_bnfs As;
191 val nested_bnfs = nesty_bnfs Bs;
193 val timer = time (Timer.startRealTimer ());
195 fun mk_unf_or_fld get_T Ts t =
196 let val Type (_, Ts0) = get_T (fastype_of t) in
197 Term.subst_atomic_types (Ts0 ~~ Ts) t
200 val mk_unf = mk_unf_or_fld domain_type;
201 val mk_fld = mk_unf_or_fld range_type;
203 val unfs = map (mk_unf As) unfs0;
204 val flds = map (mk_fld As) flds0;
206 val fpTs = map (domain_type o fastype_of) unfs;
208 val exists_fp_subtype = exists_subtype (member (op =) fpTs);
210 val vs = map2 (curry Free) vs' fpTs;
212 val ctr_Tsss = map (map (map (Term.typ_subst_atomic (Bs ~~ fpTs)))) ctr_TsssBs;
213 val ns = map length ctr_Tsss;
214 val kss = map (fn n => 1 upto n) ns;
215 val mss = map (map length) ctr_Tsss;
216 val Css = map2 replicate ns Cs;
218 fun mk_iter_like Ts Us t =
220 val (bindings, body) = strip_type (fastype_of t);
221 val (f_Us, prebody) = split_last bindings;
222 val Type (_, Ts0) = if lfp then prebody else body;
223 val Us0 = distinct (op =) (map (if lfp then body_type else domain_type) f_Us);
225 Term.subst_atomic_types (Ts0 @ Us0 ~~ Ts @ Us) t
228 val fp_iters as fp_iter1 :: _ = map (mk_iter_like As Cs) fp_iters0;
229 val fp_recs as fp_rec1 :: _ = map (mk_iter_like As Cs) fp_recs0;
231 val fp_iter_fun_Ts = fst (split_last (binder_types (fastype_of fp_iter1)));
232 val fp_rec_fun_Ts = fst (split_last (binder_types (fastype_of fp_rec1)));
234 val ((iter_only as (gss, _, _), rec_only as (hss, _, _)),
235 (zs, cs, cpss, coiter_only as ((pgss, crgsss), _), corec_only as ((phss, cshsss), _))) =
239 map3 (fn n => fn ms => map2 dest_tupleT ms o dest_sumTN_balanced n o domain_type)
240 ns mss fp_iter_fun_Ts;
241 val g_Tss = map2 (map2 (curry (op --->))) y_Tsss Css;
243 val ((gss, ysss), _) =
245 |> mk_Freess "f" g_Tss
246 ||>> mk_Freesss "x" y_Tsss;
247 val yssss = map (map (map single)) ysss;
249 fun dest_rec_prodT (T as Type (@{type_name prod}, Us as [_, U])) =
250 if member (op =) Cs U then Us else [T]
251 | dest_rec_prodT T = [T];
254 map3 (fn n => fn ms => map2 (map dest_rec_prodT oo dest_tupleT) ms o
255 dest_sumTN_balanced n o domain_type) ns mss fp_rec_fun_Ts;
256 val h_Tss = map2 (map2 (fold_rev (curry (op --->)))) z_Tssss Css;
258 val hss = map2 (map2 retype_free) h_Tss gss;
259 val zssss_hd = map2 (map2 (map2 (retype_free o hd))) z_Tssss ysss;
262 |> mk_Freessss "y" (map (map (map tl)) z_Tssss);
263 val zssss = map2 (map2 (map2 cons)) zssss_hd zssss_tl;
265 (((gss, g_Tss, yssss), (hss, h_Tss, zssss)),
266 ([], [], [], (([], []), ([], [])), (([], []), ([], []))))
270 (*avoid "'a itself" arguments in coiterators and corecursors*)
271 val mss' = map (fn [0] => [1] | ms => ms) mss;
273 val p_Tss = map2 (fn n => replicate (Int.max (0, n - 1)) o mk_predT) ns Cs;
275 fun zip_predss_getterss qss fss = maps (op @) (qss ~~ fss);
277 fun zip_preds_predsss_gettersss [] [qss] [fss] = zip_predss_getterss qss fss
278 | zip_preds_predsss_gettersss (p :: ps) (qss :: qsss) (fss :: fsss) =
279 p :: zip_predss_getterss qss fss @ zip_preds_predsss_gettersss ps qsss fsss;
281 fun mk_types maybe_dest_sumT fun_Ts =
283 val f_sum_prod_Ts = map range_type fun_Ts;
284 val f_prod_Tss = map2 dest_sumTN_balanced ns f_sum_prod_Ts;
286 map3 (fn C => map2 (map (map (curry (op -->) C) o maybe_dest_sumT) oo dest_tupleT))
289 map (map (map (fn [_] => [] | [_, C] => [mk_predT (domain_type C)]))) f_Tssss;
290 val pf_Tss = map3 zip_preds_predsss_gettersss p_Tss q_Tssss f_Tssss;
291 in (q_Tssss, f_sum_prod_Ts, f_Tssss, pf_Tss) end;
293 val (r_Tssss, g_sum_prod_Ts, g_Tssss, pg_Tss) = mk_types single fp_iter_fun_Ts;
295 val ((((Free (z, _), cs), pss), gssss), _) =
297 |> yield_singleton (mk_Frees "z") dummyT
299 ||>> mk_Freess "p" p_Tss
300 ||>> mk_Freessss "g" g_Tssss;
301 val rssss = map (map (map (fn [] => []))) r_Tssss;
303 fun dest_corec_sumT (T as Type (@{type_name sum}, Us as [_, U])) =
304 if member (op =) Cs U then Us else [T]
305 | dest_corec_sumT T = [T];
307 val (s_Tssss, h_sum_prod_Ts, h_Tssss, ph_Tss) = mk_types dest_corec_sumT fp_rec_fun_Ts;
309 val hssss_hd = map2 (map2 (map2 (fn T :: _ => fn [g] => retype_free T g))) h_Tssss gssss;
310 val ((sssss, hssss_tl), _) =
312 |> mk_Freessss "q" s_Tssss
313 ||>> mk_Freessss "h" (map (map (map tl)) h_Tssss);
314 val hssss = map2 (map2 (map2 cons)) hssss_hd hssss_tl;
316 val cpss = map2 (fn c => map (fn p => p $ c)) cs pss;
318 fun mk_preds_getters_join [] [cf] = cf
319 | mk_preds_getters_join [cq] [cf, cf'] =
320 mk_If cq (mk_Inl (fastype_of cf') cf) (mk_Inr (fastype_of cf) cf');
322 fun mk_terms qssss fssss =
324 val pfss = map3 zip_preds_predsss_gettersss pss qssss fssss;
325 val cqssss = map2 (fn c => map (map (map (fn f => f $ c)))) cs qssss;
326 val cfssss = map2 (fn c => map (map (map (fn f => f $ c)))) cs fssss;
327 val cqfsss = map2 (map2 (map2 mk_preds_getters_join)) cqssss cfssss;
328 in (pfss, cqfsss) end;
330 ((([], [], []), ([], [], [])),
331 ([z], cs, cpss, (mk_terms rssss gssss, (g_sum_prod_Ts, pg_Tss)),
332 (mk_terms sssss hssss, (h_sum_prod_Ts, ph_Tss))))
335 fun define_ctrs_case_for_type (((((((((((((((((((fp_b, fpT), C), v), fld), unf), fp_iter),
336 fp_rec), fld_unf), unf_fld), fld_inject), n), ks), ms), ctr_bindings), ctr_mixfixes),
337 ctr_Tss), disc_bindings), sel_bindingss), raw_sel_defaultss) no_defs_lthy =
339 val unfT = domain_type (fastype_of fld);
340 val ctr_prod_Ts = map HOLogic.mk_tupleT ctr_Tss;
341 val ctr_sum_prod_T = mk_sumTN_balanced ctr_prod_Ts;
342 val case_Ts = map (fn Ts => Ts ---> C) ctr_Tss;
344 val (((u, fs), xss), _) =
346 |> yield_singleton (mk_Frees "u") unfT
347 ||>> mk_Frees "f" case_Ts
348 ||>> mk_Freess "x" ctr_Tss;
351 map2 (fn k => fn xs => fold_rev Term.lambda xs (fld $
352 mk_InN_balanced ctr_sum_prod_T n (HOLogic.mk_tuple xs) k)) ks xss;
354 val case_binding = Binding.suffix_name ("_" ^ caseN) fp_b;
357 fold_rev Term.lambda (fs @ [v])
358 (mk_sum_caseN_balanced (map2 mk_uncurried_fun fs xss) $ (unf $ v));
360 val ((raw_case :: raw_ctrs, raw_case_def :: raw_ctr_defs), (lthy', lthy)) = no_defs_lthy
361 |> apfst split_list o fold_map3 (fn b => fn mx => fn rhs =>
362 Local_Theory.define ((b, mx), ((Thm.def_binding b, []), rhs)) #>> apsnd snd)
363 (case_binding :: ctr_bindings) (NoSyn :: ctr_mixfixes) (case_rhs :: ctr_rhss)
364 ||> `Local_Theory.restore;
366 val phi = Proof_Context.export_morphism lthy lthy';
368 val ctr_defs = map (Morphism.thm phi) raw_ctr_defs;
369 val case_def = Morphism.thm phi raw_case_def;
371 val ctrs0 = map (Morphism.term phi) raw_ctrs;
372 val casex0 = Morphism.term phi raw_case;
374 val ctrs = map (mk_ctr As) ctrs0;
376 fun exhaust_tac {context = ctxt, ...} =
378 val fld_iff_unf_thm =
381 fold_rev Logic.all [u, v]
382 (mk_Trueprop_eq (HOLogic.mk_eq (v, fld $ u), HOLogic.mk_eq (unf $ v, u)));
384 Skip_Proof.prove lthy [] [] goal (fn {context = ctxt, ...} =>
385 mk_fld_iff_unf_tac ctxt (map (SOME o certifyT lthy) [unfT, fpT])
386 (certify lthy fld) (certify lthy unf) fld_unf unf_fld)
387 |> Thm.close_derivation
392 Local_Defs.unfold lthy @{thms all_unit_eq}
393 (Drule.instantiate' (map (SOME o certifyT lthy) ctr_prod_Ts) []
394 (mk_sumEN_balanced n))
397 mk_exhaust_tac ctxt n ctr_defs fld_iff_unf_thm sumEN_thm'
401 map2 (fn 0 => K [] | _ => fn ctr_def => [fn {context = ctxt, ...} =>
402 mk_inject_tac ctxt ctr_def fld_inject]) ms ctr_defs;
404 val half_distinct_tacss =
405 map (map (fn (def, def') => fn {context = ctxt, ...} =>
406 mk_half_distinct_tac ctxt fld_inject [def, def'])) (mk_half_pairss ctr_defs);
409 map3 (fn k => fn m => fn ctr_def => fn {context = ctxt, ...} =>
410 mk_case_tac ctxt n k m case_def ctr_def unf_fld) ks ms ctr_defs;
412 val tacss = [exhaust_tac] :: inject_tacss @ half_distinct_tacss @ [case_tacs];
414 fun define_iter_rec ((selss0, discIs, sel_thmss), no_defs_lthy) =
416 val fpT_to_C = fpT --> C;
418 fun generate_iter_like (suf, fp_iter_like, (fss, f_Tss, xssss)) =
420 val res_T = fold_rev (curry (op --->)) f_Tss fpT_to_C;
421 val binding = Binding.suffix_name ("_" ^ suf) fp_b;
423 mk_Trueprop_eq (lists_bmoc fss (Free (Binding.name_of binding, res_T)),
424 Term.list_comb (fp_iter_like,
425 map2 (mk_sum_caseN_balanced oo map2 mk_uncurried2_fun) fss xssss));
426 in (binding, spec) end;
428 val iter_like_infos =
429 [(iterN, fp_iter, iter_only),
430 (recN, fp_rec, rec_only)];
432 val (bindings, specs) = map generate_iter_like iter_like_infos |> split_list;
434 val ((csts, defs), (lthy', lthy)) = no_defs_lthy
435 |> apfst split_list o fold_map2 (fn b => fn spec =>
436 Specification.definition (SOME (b, NONE, NoSyn), ((Thm.def_binding b, []), spec))
437 #>> apsnd snd) bindings specs
438 ||> `Local_Theory.restore;
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;
462 val binding = Binding.suffix_name ("_" ^ suf) fp_b;
464 mk_Trueprop_eq (lists_bmoc pfss (Free (Binding.name_of binding, res_T)),
465 Term.list_comb (fp_iter_like,
466 map5 mk_preds_getterss_join cs ns cpss f_sum_prod_Ts cqfsss));
467 in (binding, spec) end;
469 val coiter_like_infos =
470 [(coiterN, fp_iter, coiter_only),
471 (corecN, fp_rec, corec_only)];
473 val (bindings, specs) = map generate_coiter_like coiter_like_infos |> split_list;
475 val ((csts, defs), (lthy', lthy)) = no_defs_lthy
476 |> apfst split_list o fold_map2 (fn b => fn spec =>
477 Specification.definition (SOME (b, NONE, NoSyn), ((Thm.def_binding b, []), spec))
478 #>> apsnd snd) bindings specs
479 ||> `Local_Theory.restore;
481 val phi = Proof_Context.export_morphism lthy lthy';
483 val [coiter_def, corec_def] = map (Morphism.thm phi) defs;
485 val [coiter, corec] = map (mk_iter_like As Cs o Morphism.term phi) csts;
487 ((ctrs, selss0, coiter, corec, v, xss, ctr_defs, discIs, sel_thmss, coiter_def,
492 let val sel_defaultss = map (map (apsnd (prepare_term lthy))) raw_sel_defaultss in
493 wrap_datatype tacss (((no_dests, ctrs0), casex0), (disc_bindings, (sel_bindingss,
494 sel_defaultss))) lthy
497 val define_iter_likes = if lfp then define_iter_rec else define_coiter_corec;
499 ((wrap, define_iter_likes), lthy')
502 val pre_map_defs = map map_def_of_bnf pre_bnfs;
503 val pre_set_defss = map set_defs_of_bnf pre_bnfs;
504 val nesting_map_ids = map map_id_of_bnf nesting_bnfs;
507 let val (Type (_, Ts0), Type (_, Us0)) = strip_map_type (fastype_of t) |>> List.last in
508 Term.subst_atomic_types (Ts0 @ Us0 ~~ Ts @ Us) t
511 fun build_map build_arg (Type (s, Ts)) (Type (_, Us)) =
513 val map0 = map_of_bnf (the (bnf_of lthy s));
514 val mapx = mk_map Ts Us map0;
515 val TUs = map dest_funT (fst (split_last (fst (strip_map_type (fastype_of mapx)))));
516 val args = map build_arg TUs;
517 in Term.list_comb (mapx, args) end;
519 fun derive_induct_iter_rec_thms_for_types ((ctrss, _, iters, recs, vs, xsss, ctr_defss, _, _,
520 iter_defs, rec_defs), lthy) =
522 fun mk_sets_nested bnf =
524 val Type (T_name, Us) = T_of_bnf bnf;
525 val lives = lives_of_bnf bnf;
526 val sets = sets_of_bnf bnf;
528 (case find_index (curry (op =) U) lives of
532 (T_name, map mk_set Us)
535 val setss_nested = map mk_sets_nested nested_bnfs;
537 val (induct_thms, induct_thm) =
539 val ((phis, phis'), names_lthy) =
541 |> mk_Frees' "P" (map mk_predT fpTs);
544 let val Type (_, Ts0) = domain_type (fastype_of t) in
545 Term.subst_atomic_types (Ts0 ~~ Ts) t
548 fun mk_prem_prems names_lthy (x as Free (s, T as Type (T_name, Ts0))) =
549 (case find_index (curry (op =) T) fpTs of
551 (case AList.lookup (op =) setss_nested T_name of
556 split_list (filter (exists_fp_subtype o fst) (Ts0 ~~ raw_sets0));
557 val sets = map (mk_set Ts0) raw_sets;
558 val (ys, names_lthy') = names_lthy |> mk_Frees s Ts;
560 map2 (fn y => fn set => HOLogic.mk_Trueprop (HOLogic.mk_mem (y, set $ x)))
562 val bodies = flat (map (mk_prem_prems names_lthy') ys);
564 map2 (curry Logic.mk_implies) heads bodies
566 | i => [HOLogic.mk_Trueprop (nth phis i $ x)])
567 | mk_prem_prems _ _ = [];
569 fun close_prem_prem (Free x') t =
570 fold_rev Logic.all (map Free (drop (N + 1) (rev (Term.add_frees t (x' :: phis'))))) t;
572 fun mk_prem phi ctr ctr_Ts =
574 val (xs, names_lthy') = names_lthy |> mk_Frees "x" ctr_Ts;
576 maps (fn x => map (close_prem_prem x) (mk_prem_prems names_lthy' x)) xs;
578 fold_rev Logic.all xs
579 (Logic.list_implies (prem_prems,
580 HOLogic.mk_Trueprop (phi $ Term.list_comb (ctr, xs))))
584 fold_rev (fold_rev Logic.all) [phis, vs]
585 (Library.foldr Logic.list_implies (map3 (map2 o mk_prem) phis ctrss ctr_Tsss,
586 HOLogic.mk_Trueprop (Library.foldr1 HOLogic.mk_conj
587 (map2 (curry (op $)) phis vs))));
590 Skip_Proof.prove lthy [] [] goal (fn {context = ctxt, ...} =>
593 `(conj_dests N) induct_thm
596 val (iter_thmss, rec_thmss) =
598 val xctrss = map2 (map2 (curry Term.list_comb)) ctrss xsss;
599 val giters = map (lists_bmoc gss) iters;
600 val hrecs = map (lists_bmoc hss) recs;
602 fun mk_goal_iter_like fss fiter_like xctr f xs fxs =
603 fold_rev (fold_rev Logic.all) (xs :: fss)
604 (mk_Trueprop_eq (fiter_like $ xctr, Term.list_comb (f, fxs)));
606 fun build_call fiter_likes maybe_tick (T, U) =
610 (case find_index (curry (op =) T) fpTs of
611 ~1 => build_map (build_call fiter_likes maybe_tick) T U
612 | j => maybe_tick (nth vs j) (nth fiter_likes j));
614 fun mk_U maybe_mk_prodT =
615 typ_subst (map2 (fn fpT => fn C => (fpT, maybe_mk_prodT fpT C)) fpTs Cs);
617 fun intr_calls fiter_likes maybe_cons maybe_tick maybe_mk_prodT (x as Free (_, T)) =
618 if member (op =) fpTs T then
619 maybe_cons x [build_call fiter_likes (K I) (T, mk_U (K I) T) $ x]
620 else if exists_fp_subtype T then
621 [build_call fiter_likes maybe_tick (T, mk_U maybe_mk_prodT T) $ x]
625 val gxsss = map (map (maps (intr_calls giters (K I) (K I) (K I)))) xsss;
626 val hxsss = map (map (maps (intr_calls hrecs cons tick (curry HOLogic.mk_prodT)))) xsss;
628 val goal_iterss = map5 (map4 o mk_goal_iter_like gss) giters xctrss gss xsss gxsss;
629 val goal_recss = map5 (map4 o mk_goal_iter_like hss) hrecs xctrss hss xsss hxsss;
632 map2 (map o mk_iter_like_tac pre_map_defs nesting_map_ids iter_defs) fp_iter_thms
635 map2 (map o mk_iter_like_tac pre_map_defs nesting_map_ids rec_defs) fp_rec_thms
638 (map2 (map2 (fn goal => fn tac => Skip_Proof.prove lthy [] [] goal (tac o #context)))
639 goal_iterss iter_tacss,
640 map2 (map2 (fn goal => fn tac => Skip_Proof.prove lthy [] [] goal (tac o #context)))
641 goal_recss rec_tacss)
645 (if N > 1 then [(inductN, [induct_thm], [])] (* FIXME: attribs *) else [])
646 |> map (fn (thmN, thms, attrs) =>
647 ((Binding.qualify true fp_common_name (Binding.name thmN), attrs), [(thms, [])]));
650 [(inductN, map single induct_thms, []), (* FIXME: attribs *)
651 (itersN, iter_thmss, simp_attrs),
652 (recsN, rec_thmss, Code.add_default_eqn_attrib :: simp_attrs)]
653 |> maps (fn (thmN, thmss, attrs) =>
654 map2 (fn b => fn thms =>
655 ((Binding.qualify true (Binding.name_of b) (Binding.name thmN), attrs),
656 [(thms, [])])) fp_bs thmss);
658 lthy |> Local_Theory.notes (common_notes @ notes) |> snd
661 fun derive_coinduct_coiter_corec_thms_for_types ((ctrss, selsss, coiters, corecs, vs, _,
662 ctr_defss, discIss, sel_thmsss, coiter_defs, corec_defs), lthy) =
664 val (coinduct_thms, coinduct_thm) =
666 val coinduct_thm = fp_induct;
668 `(conj_dests N) coinduct_thm
671 val (coiter_thmss, corec_thmss) =
673 val z = the_single zs;
674 val gcoiters = map (lists_bmoc pgss) coiters;
675 val hcorecs = map (lists_bmoc phss) corecs;
677 fun mk_goal_cond pos = HOLogic.mk_Trueprop o (not pos ? HOLogic.mk_not);
679 fun mk_goal_coiter_like pfss c cps fcoiter_like n k ctr m cfs' =
680 fold_rev (fold_rev Logic.all) ([c] :: pfss)
681 (Logic.list_implies (seq_conds mk_goal_cond n k cps,
682 mk_Trueprop_eq (fcoiter_like $ c, Term.list_comb (ctr, take m cfs'))));
684 fun build_call fiter_likes maybe_tack (T, U) =
688 (case find_index (curry (op =) U) fpTs of
689 ~1 => build_map (build_call fiter_likes maybe_tack) T U
690 | j => maybe_tack (nth cs j, nth vs j) (nth fiter_likes j));
692 fun mk_U maybe_mk_sumT =
693 typ_subst (map2 (fn C => fn fpT => (maybe_mk_sumT fpT C, fpT)) Cs fpTs);
695 fun intr_calls fiter_likes maybe_mk_sumT maybe_tack cqf =
696 let val T = fastype_of cqf in
697 if exists_subtype (member (op =) Cs) T then
698 build_call fiter_likes maybe_tack (T, mk_U maybe_mk_sumT T) $ cqf
703 val crgsss' = map (map (map (intr_calls gcoiters (K I) (K I)))) crgsss;
704 val cshsss' = map (map (map (intr_calls hcorecs (curry mk_sumT) (tack z)))) cshsss;
707 map8 (map4 oooo mk_goal_coiter_like pgss) cs cpss gcoiters ns kss ctrss mss crgsss';
709 map8 (map4 oooo mk_goal_coiter_like phss) cs cpss hcorecs ns kss ctrss mss cshsss';
712 map3 (map oo mk_coiter_like_tac coiter_defs nesting_map_ids) fp_iter_thms pre_map_defs
715 map3 (map oo mk_coiter_like_tac corec_defs nesting_map_ids) fp_rec_thms pre_map_defs
718 (map2 (map2 (fn goal => fn tac =>
719 Skip_Proof.prove lthy [] [] goal (tac o #context) |> Thm.close_derivation))
720 goal_coiterss coiter_tacss,
721 map2 (map2 (fn goal => fn tac =>
722 Skip_Proof.prove lthy [] [] goal (tac o #context)
723 |> Local_Defs.unfold lthy @{thms sum_case_if} |> Thm.close_derivation))
724 goal_corecss corec_tacss)
727 fun mk_disc_coiter_like_thms [_] = K []
728 | mk_disc_coiter_like_thms thms = map2 (curry (op RS)) thms;
730 val disc_coiter_thmss = map2 mk_disc_coiter_like_thms coiter_thmss discIss;
731 val disc_corec_thmss = map2 mk_disc_coiter_like_thms corec_thmss discIss;
733 fun mk_sel_coiter_like_thm coiter_like_thm sel0 sel_thm =
735 val (domT, ranT) = dest_funT (fastype_of sel0);
737 Drule.instantiate' (map (SOME o certifyT lthy) [domT, ranT])
738 [NONE, NONE, SOME (certify lthy sel0)] arg_cong
739 |> Thm.varifyT_global;
740 val sel_thm' = sel_thm RSN (2, trans);
742 coiter_like_thm RS arg_cong' RS sel_thm'
745 val sel_coiter_thmsss =
746 map3 (map3 (map2 o mk_sel_coiter_like_thm)) coiter_thmss selsss sel_thmsss;
747 val sel_corec_thmsss =
748 map3 (map3 (map2 o mk_sel_coiter_like_thm)) corec_thmss selsss sel_thmsss;
751 (if N > 1 then [(coinductN, [coinduct_thm], [])] (* FIXME: attribs *) else [])
752 |> map (fn (thmN, thms, attrs) =>
753 ((Binding.qualify true fp_common_name (Binding.name thmN), attrs), [(thms, [])]));
756 [(coinductN, map single coinduct_thms, []), (* FIXME: attribs *)
757 (coitersN, coiter_thmss, []),
758 (disc_coitersN, disc_coiter_thmss, []),
759 (sel_coitersN, map flat sel_coiter_thmsss, []),
760 (corecsN, corec_thmss, []),
761 (disc_corecsN, disc_corec_thmss, []),
762 (sel_corecsN, map flat sel_corec_thmsss, [])]
763 |> maps (fn (thmN, thmss, attrs) =>
764 map_filter (fn (_, []) => NONE | (b, thms) =>
765 SOME ((Binding.qualify true (Binding.name_of b) (Binding.name thmN), attrs),
766 [(thms, [])])) (fp_bs ~~ thmss));
768 lthy |> Local_Theory.notes (common_notes @ notes) |> snd
771 fun wrap_types_and_define_iter_likes ((wraps, define_iter_likess), lthy) =
772 fold_map2 (curry (op o)) define_iter_likess wraps lthy |>> split_list11
775 |> fold_map define_ctrs_case_for_type (fp_bs ~~ fpTs ~~ Cs ~~ vs ~~ flds ~~ unfs ~~
776 fp_iters ~~ fp_recs ~~ fld_unfs ~~ unf_flds ~~ fld_injects ~~ ns ~~ kss ~~ mss ~~
777 ctr_bindingss ~~ ctr_mixfixess ~~ ctr_Tsss ~~ disc_bindingss ~~ sel_bindingsss ~~
779 |>> split_list |> wrap_types_and_define_iter_likes
780 |> (if lfp then derive_induct_iter_rec_thms_for_types
781 else derive_coinduct_coiter_corec_thms_for_types);
783 val timer = time (timer ("Constructors, discriminators, selectors, etc., for the new " ^
784 (if lfp then "" else "co") ^ "datatype"));
789 val datatyp = define_datatype (K I) (K I) (K I);
791 val datatype_cmd = define_datatype Typedecl.read_constraint Syntax.parse_typ Syntax.read_term;
793 val parse_binding_colon = Parse.binding --| @{keyword ":"};
794 val parse_opt_binding_colon = Scan.optional parse_binding_colon no_binding;
797 @{keyword "("} |-- parse_binding_colon -- Parse.typ --| @{keyword ")"} ||
798 (Parse.typ >> pair no_binding);
801 @{keyword "("} |-- @{keyword "defaults"} |-- Scan.repeat parse_bound_term --| @{keyword ")"};
803 val parse_single_spec =
804 Parse.type_args_constrained -- Parse.binding -- Parse.opt_mixfix --
805 (@{keyword "="} |-- Parse.enum1 "|" (parse_opt_binding_colon -- Parse.binding --
806 Scan.repeat parse_ctr_arg -- Scan.optional parse_defaults [] -- Parse.opt_mixfix));
808 val parse_datatype = parse_wrap_options -- Parse.and_list1 parse_single_spec;
810 fun parse_datatype_cmd lfp construct = parse_datatype >> datatype_cmd lfp construct;