1 (* Title: HOL/Tools/Lifting/lifting_def.ML
4 Definitions for constants on quotient types.
7 signature LIFTING_DEF =
9 val generate_parametric_transfer_rule:
10 Proof.context -> thm -> thm -> thm
13 (binding * mixfix) -> typ -> term -> thm -> thm list -> local_theory -> local_theory
16 (binding * string option * mixfix) * string * (Facts.ref * Args.src list) list -> local_theory -> Proof.state
18 val can_generate_code_cert: thm -> bool
21 structure Lifting_Def: LIFTING_DEF =
28 (* Reflexivity prover *)
30 fun mono_eq_prover ctxt prop =
32 val refl_rules = Lifting_Info.get_reflexivity_rules ctxt
33 val transfer_rules = Transfer.get_transfer_raw ctxt
36 case HOLogic.dest_Trueprop t of
37 Const (@{const_name "less_eq"}, _) $ _ $ _ => REPEAT_ALL_NEW (resolve_tac refl_rules) i
38 | _ => REPEAT_ALL_NEW (resolve_tac transfer_rules) i
40 SOME (Goal.prove ctxt [] [] prop (K (SUBGOAL main_tac 1)))
41 handle ERROR _ => NONE
44 fun try_prove_reflexivity ctxt prop =
46 val thy = Proof_Context.theory_of ctxt
47 val cprop = cterm_of thy prop
48 val rule = @{thm ge_eq_refl}
49 val concl_pat = Drule.strip_imp_concl (cprop_of rule)
50 val insts = Thm.first_order_match (concl_pat, cprop)
51 val rule = Drule.instantiate_normalize insts rule
52 val prop = hd (prems_of rule)
54 case mono_eq_prover ctxt prop of
55 SOME thm => SOME (thm RS rule)
60 Generates a parametrized transfer rule.
61 transfer_rule - of the form T t f
62 parametric_transfer_rule - of the form par_R t' t
64 Result: par_T t' f, after substituing op= for relations in par_R that relate
65 a type constructor to the same type constructor, it is a merge of (par_R' OO T) t' f
66 using Lifting_Term.merge_transfer_relations
69 fun generate_parametric_transfer_rule ctxt transfer_rule parametric_transfer_rule =
71 fun preprocess ctxt thm =
73 val tm = (strip_args 2 o HOLogic.dest_Trueprop o concl_of) thm;
74 val param_rel = (snd o dest_comb o fst o dest_comb) tm;
75 val thy = Proof_Context.theory_of ctxt;
76 val free_vars = Term.add_vars param_rel [];
78 fun make_subst (var as (_, typ)) subst =
80 val [rty, rty'] = binder_types typ
82 if (Term.is_TVar rty andalso is_Type rty') then
83 (Var var, HOLogic.eq_const rty')::subst
88 val subst = fold make_subst free_vars [];
89 val csubst = map (pairself (cterm_of thy)) subst;
90 val inst_thm = Drule.cterm_instantiate csubst thm;
93 ((Conv.concl_conv (nprems_of inst_thm) o HOLogic.Trueprop_conv o Conv.fun2_conv o Conv.arg1_conv)
94 (Raw_Simplifier.rewrite ctxt false (Transfer.get_sym_relator_eq ctxt))) inst_thm
97 fun inst_relcomppI thy ant1 ant2 =
99 val t1 = (HOLogic.dest_Trueprop o concl_of) ant1
100 val t2 = (HOLogic.dest_Trueprop o prop_of) ant2
101 val fun1 = cterm_of thy (strip_args 2 t1)
102 val args1 = map (cterm_of thy) (get_args 2 t1)
103 val fun2 = cterm_of thy (strip_args 2 t2)
104 val args2 = map (cterm_of thy) (get_args 1 t2)
105 val relcomppI = Drule.incr_indexes2 ant1 ant2 @{thm relcomppI}
106 val vars = (rev (Term.add_vars (prop_of relcomppI) []))
107 val subst = map (apfst ((cterm_of thy) o Var)) (vars ~~ ([fun1] @ args1 @ [fun2] @ args2))
109 Drule.cterm_instantiate subst relcomppI
112 fun zip_transfer_rules ctxt thm =
114 val thy = Proof_Context.theory_of ctxt
115 fun mk_POS ty = Const (@{const_name POS}, ty --> ty --> HOLogic.boolT)
116 val rel = (Thm.dest_fun2 o Thm.dest_arg o cprop_of) thm
117 val typ = (typ_of o ctyp_of_term) rel
118 val POS_const = cterm_of thy (mk_POS typ)
119 val var = cterm_of thy (Var (("X", #maxidx (rep_cterm (rel)) + 1), typ))
120 val goal = Thm.apply (cterm_of thy HOLogic.Trueprop) (Thm.apply (Thm.apply POS_const rel) var)
122 [Lifting_Term.merge_transfer_relations ctxt goal, thm] MRSL @{thm POS_apply}
125 val thm = (inst_relcomppI (Proof_Context.theory_of ctxt) parametric_transfer_rule transfer_rule)
126 OF [parametric_transfer_rule, transfer_rule]
127 val preprocessed_thm = preprocess ctxt thm
129 val (fixed_thm, ctxt) = yield_singleton (apfst snd oo Variable.import true) preprocessed_thm ctxt
130 val assms = cprems_of fixed_thm
131 val add_transfer_rule = Thm.attribute_declaration Transfer.transfer_add
132 val (prems, ctxt) = fold_map Thm.assume_hyps assms ctxt
133 val ctxt = Context.proof_map (fold add_transfer_rule prems) ctxt
137 |> zip_transfer_rules ctxt
138 |> implies_intr_list assms
139 |> singleton (Variable.export ctxt orig_ctxt)
144 fun print_generate_transfer_info msg =
146 val error_msg = cat_lines
147 ["Generation of a parametric transfer rule failed.",
148 (Pretty.string_of (Pretty.block
149 [Pretty.str "Reason:", Pretty.brk 2, msg]))]
154 fun map_ter _ x [] = x
155 | map_ter f _ xs = map f xs
157 fun generate_transfer_rules lthy quot_thm rsp_thm def_thm par_thms =
160 ([quot_thm, rsp_thm, def_thm] MRSL @{thm Quotient_to_transfer})
161 |> Lifting_Term.parametrize_transfer_rule lthy
163 (map_ter (generate_parametric_transfer_rule lthy transfer_rule) [transfer_rule] par_thms
164 handle Lifting_Term.MERGE_TRANSFER_REL msg => (print_generate_transfer_info msg; [transfer_rule]))
167 (* Generation of the code certificate from the rsp theorem *)
169 fun get_body_types (Type ("fun", [_, U]), Type ("fun", [_, V])) = get_body_types (U, V)
170 | get_body_types (U, V) = (U, V)
172 fun get_binder_types (Type ("fun", [T, U]), Type ("fun", [V, W])) = (T, V) :: get_binder_types (U, W)
173 | get_binder_types _ = []
175 fun get_binder_types_by_rel (Const (@{const_name "rel_fun"}, _) $ _ $ S) (Type ("fun", [T, U]), Type ("fun", [V, W])) =
176 (T, V) :: get_binder_types_by_rel S (U, W)
177 | get_binder_types_by_rel _ _ = []
179 fun get_body_type_by_rel (Const (@{const_name "rel_fun"}, _) $ _ $ S) (Type ("fun", [_, U]), Type ("fun", [_, V])) =
180 get_body_type_by_rel S (U, V)
181 | get_body_type_by_rel _ (U, V) = (U, V)
183 fun force_rty_type ctxt rty rhs =
185 val thy = Proof_Context.theory_of ctxt
186 val rhs_schematic = singleton (Variable.polymorphic ctxt) rhs
187 val rty_schematic = fastype_of rhs_schematic
188 val match = Sign.typ_match thy (rty_schematic, rty) Vartab.empty
190 Envir.subst_term_types match rhs_schematic
193 fun unabs_def ctxt def =
195 val (_, rhs) = Thm.dest_equals (cprop_of def)
196 fun dest_abs (Abs (var_name, T, _)) = (var_name, T)
197 | dest_abs tm = raise TERM("get_abs_var",[tm])
198 val (var_name, T) = dest_abs (term_of rhs)
199 val (new_var_names, ctxt') = Variable.variant_fixes [var_name] ctxt
200 val thy = Proof_Context.theory_of ctxt'
201 val refl_thm = Thm.reflexive (cterm_of thy (Free (hd new_var_names, T)))
203 Thm.combination def refl_thm |>
204 singleton (Proof_Context.export ctxt' ctxt)
207 fun unabs_all_def ctxt def =
209 val (_, rhs) = Thm.dest_equals (cprop_of def)
210 val xs = strip_abs_vars (term_of rhs)
212 fold (K (unabs_def ctxt)) xs def
215 val map_fun_unfolded =
216 @{thm map_fun_def[abs_def]} |>
217 unabs_def @{context} |>
218 unabs_def @{context} |>
219 Local_Defs.unfold @{context} [@{thm comp_def}]
221 fun unfold_fun_maps ctm =
223 fun unfold_conv ctm =
224 case (Thm.term_of ctm) of
225 Const (@{const_name "map_fun"}, _) $ _ $ _ =>
226 (Conv.arg_conv unfold_conv then_conv Conv.rewr_conv map_fun_unfolded) ctm
227 | _ => Conv.all_conv ctm
229 (Conv.fun_conv unfold_conv) ctm
232 fun unfold_fun_maps_beta ctm =
233 let val try_beta_conv = Conv.try_conv (Thm.beta_conversion false)
235 (unfold_fun_maps then_conv try_beta_conv) ctm
238 fun prove_rel ctxt rsp_thm (rty, qty) =
240 val ty_args = get_binder_types (rty, qty)
241 fun disch_arg args_ty thm =
243 val quot_thm = Lifting_Term.prove_quot_thm ctxt args_ty
245 [quot_thm, thm] MRSL @{thm apply_rsp''}
248 fold disch_arg ty_args rsp_thm
251 exception CODE_CERT_GEN of string
253 fun simplify_code_eq ctxt def_thm =
254 Local_Defs.unfold ctxt [@{thm o_apply}, @{thm map_fun_def}, @{thm id_apply}] def_thm
257 quot_thm - quotient theorem (Quotient R Abs Rep T).
258 returns: whether the Lifting package is capable to generate code for the abstract type
259 represented by quot_thm
262 fun can_generate_code_cert quot_thm =
263 case quot_thm_rel quot_thm of
264 Const (@{const_name HOL.eq}, _) => true
265 | Const (@{const_name eq_onp}, _) $ _ => true
268 fun generate_rep_eq ctxt def_thm rsp_thm (rty, qty) =
270 val unfolded_def = Conv.fconv_rule (Conv.arg_conv unfold_fun_maps_beta) def_thm
271 val unabs_def = unabs_all_def ctxt unfolded_def
273 if body_type rty = body_type qty then
274 SOME (simplify_code_eq ctxt (unabs_def RS @{thm meta_eq_to_obj_eq}))
277 val thy = Proof_Context.theory_of ctxt
278 val quot_thm = Lifting_Term.prove_quot_thm ctxt (get_body_types (rty, qty))
279 val rel_fun = prove_rel ctxt rsp_thm (rty, qty)
280 val rep_abs_thm = [quot_thm, rel_fun] MRSL @{thm Quotient_rep_abs_eq}
282 case mono_eq_prover ctxt (hd(prems_of rep_abs_thm)) of
285 val rep_abs_eq = mono_eq_thm RS rep_abs_thm
286 val rep = (cterm_of thy o quot_thm_rep) quot_thm
287 val rep_refl = Thm.reflexive rep RS @{thm meta_eq_to_obj_eq}
288 val repped_eq = [rep_refl, unabs_def RS @{thm meta_eq_to_obj_eq}] MRSL @{thm cong}
289 val code_cert = [repped_eq, rep_abs_eq] MRSL trans
291 SOME (simplify_code_eq ctxt code_cert)
297 fun generate_abs_eq ctxt def_thm rsp_thm quot_thm =
299 val abs_eq_with_assms =
301 val (rty, qty) = quot_thm_rty_qty quot_thm
302 val rel = quot_thm_rel quot_thm
303 val ty_args = get_binder_types_by_rel rel (rty, qty)
304 val body_type = get_body_type_by_rel rel (rty, qty)
305 val quot_ret_thm = Lifting_Term.prove_quot_thm ctxt body_type
307 val rep_abs_folded_unmapped_thm =
309 val rep_id = [quot_thm, def_thm] MRSL @{thm Quotient_Rep_eq}
310 val ctm = Thm.dest_equals_lhs (cprop_of rep_id)
311 val unfolded_maps_eq = unfold_fun_maps ctm
312 val t1 = [quot_thm, def_thm, rsp_thm] MRSL @{thm Quotient_rep_abs_fold_unmap}
313 val prems_pat = (hd o Drule.cprems_of) t1
314 val insts = Thm.first_order_match (prems_pat, cprop_of unfolded_maps_eq)
316 unfolded_maps_eq RS (Drule.instantiate_normalize insts t1)
319 rep_abs_folded_unmapped_thm
320 |> fold (fn _ => fn thm => thm RS @{thm rel_funD2}) ty_args
321 |> (fn x => x RS (@{thm Quotient_rel_abs2} OF [quot_ret_thm]))
324 val prems = prems_of abs_eq_with_assms
325 val indexed_prems = map_index (apfst (fn x => x + 1)) prems
326 val indexed_assms = map (apsnd (try_prove_reflexivity ctxt)) indexed_prems
327 val proved_assms = map (apsnd the) (filter (is_some o snd) indexed_assms)
328 val abs_eq = fold_rev (fn (i, assms) => fn thm => assms RSN (i, thm)) proved_assms abs_eq_with_assms
330 simplify_code_eq ctxt abs_eq
334 fun register_code_eq_thy abs_eq_thm opt_rep_eq_thm (rty, qty) thy =
336 fun no_abstr (t $ u) = no_abstr t andalso no_abstr u
337 | no_abstr (Abs (_, _, t)) = no_abstr t
338 | no_abstr (Const (name, _)) = not (Code.is_abstr thy name)
340 fun is_valid_eq eqn = can (Code.assert_eqn thy) (mk_meta_eq eqn, true)
341 andalso no_abstr (prop_of eqn)
342 fun is_valid_abs_eq abs_eq = can (Code.assert_abs_eqn thy NONE) (mk_meta_eq abs_eq)
345 if is_valid_eq abs_eq_thm then
346 Code.add_default_eqn abs_eq_thm thy
349 val (rty_body, qty_body) = get_body_types (rty, qty)
351 if rty_body = qty_body then
352 Code.add_default_eqn (the opt_rep_eq_thm) thy
354 if is_some opt_rep_eq_thm andalso is_valid_abs_eq (the opt_rep_eq_thm)
356 Code.add_abs_eqn (the opt_rep_eq_thm) thy
363 fun encode_code_eq thy abs_eq opt_rep_eq (rty, qty) =
365 fun mk_type typ = typ |> Logic.mk_type |> cterm_of thy |> Drule.mk_term
367 Conjunction.intr_balanced [abs_eq, (the_default TrueI opt_rep_eq), mk_type rty, mk_type qty]
370 fun decode_code_eq thm =
372 val [abs_eq, rep_eq, rty, qty] = Conjunction.elim_balanced 4 thm
373 val opt_rep_eq = if Thm.eq_thm_prop (rep_eq, TrueI) then NONE else SOME rep_eq
374 fun dest_type typ = typ |> Drule.dest_term |> term_of |> Logic.dest_type
376 (abs_eq, opt_rep_eq, (dest_type rty, dest_type qty))
379 fun register_encoded_code_eq thm thy =
381 val (abs_eq_thm, opt_rep_eq_thm, (rty, qty)) = decode_code_eq thm
383 register_code_eq_thy abs_eq_thm opt_rep_eq_thm (rty, qty) thy
386 val register_code_eq_attribute = Thm.declaration_attribute
387 (fn thm => Context.mapping (register_encoded_code_eq thm) I)
388 val register_code_eq_attrib = Attrib.internal (K register_code_eq_attribute)
391 fun register_code_eq abs_eq_thm opt_rep_eq_thm (rty, qty) lthy =
393 val thy = Proof_Context.theory_of lthy
394 val encoded_code_eq = encode_code_eq thy abs_eq_thm opt_rep_eq_thm (rty, qty)
396 (snd oo Local_Theory.note) ((Binding.empty, [register_code_eq_attrib]),
397 [encoded_code_eq]) lthy
402 Defines an operation on an abstract type in terms of a corresponding operation
403 on a representation type.
405 var - a binding and a mixfix of the new constant being defined
406 qty - an abstract type of the new constant
407 rhs - a term representing the new constant on the raw level
408 rsp_thm - a respectfulness theorem in the internal tagged form (like '(R ===> R ===> R) f f'),
409 i.e. "(Lifting_Term.equiv_relation (fastype_of rhs, qty)) $ rhs $ rhs"
410 par_thms - a parametricity theorem for rhs
413 fun add_lift_def var qty rhs rsp_thm par_thms lthy =
415 val rty = fastype_of rhs
416 val quot_thm = Lifting_Term.prove_quot_thm lthy (rty, qty)
417 val absrep_trm = quot_thm_abs quot_thm
418 val rty_forced = (domain_type o fastype_of) absrep_trm
419 val forced_rhs = force_rty_type lthy rty_forced rhs
420 val lhs = Free (Binding.name_of (#1 var), qty)
421 val prop = Logic.mk_equals (lhs, absrep_trm $ forced_rhs)
422 val (_, prop') = Local_Defs.cert_def lthy prop
423 val (_, newrhs) = Local_Defs.abs_def prop'
425 val ((_, (_ , def_thm)), lthy') =
426 Local_Theory.define (var, ((Thm.def_binding (#1 var), []), newrhs)) lthy
428 val transfer_rules = generate_transfer_rules lthy' quot_thm rsp_thm def_thm par_thms
430 val abs_eq_thm = generate_abs_eq lthy' def_thm rsp_thm quot_thm
431 val opt_rep_eq_thm = generate_rep_eq lthy' def_thm rsp_thm (rty_forced, qty)
433 fun qualify defname suffix = Binding.qualified true suffix defname
435 val lhs_name = (#1 var)
436 val rsp_thm_name = qualify lhs_name "rsp"
437 val abs_eq_thm_name = qualify lhs_name "abs_eq"
438 val rep_eq_thm_name = qualify lhs_name "rep_eq"
439 val transfer_rule_name = qualify lhs_name "transfer"
440 val transfer_attr = Attrib.internal (K Transfer.transfer_add)
443 |> (snd oo Local_Theory.note) ((rsp_thm_name, []), [rsp_thm])
444 |> (snd oo Local_Theory.note) ((transfer_rule_name, [transfer_attr]), transfer_rules)
445 |> (snd oo Local_Theory.note) ((abs_eq_thm_name, []), [abs_eq_thm])
446 |> (case opt_rep_eq_thm of
447 SOME rep_eq_thm => (snd oo Local_Theory.note) ((rep_eq_thm_name, []), [rep_eq_thm])
449 |> register_code_eq abs_eq_thm opt_rep_eq_thm (rty_forced, qty)
453 val eq_onp_assms_tac_fixed_rules = map (Transfer.prep_transfer_domain_thm @{context})
454 [@{thm pcr_Domainp_total}, @{thm pcr_Domainp_par_left_total}, @{thm pcr_Domainp_par},
457 fun mk_readable_rsp_thm_eq tm lthy =
459 val ctm = cterm_of (Proof_Context.theory_of lthy) tm
461 (* This is not very cheap way of getting the rules but we have only few active
462 liftings in the current setting *)
463 fun get_cr_pcr_eqs ctxt =
465 fun collect (data : Lifting_Info.quotient) l =
466 if is_some (#pcr_info data)
467 then ((Thm.symmetric o safe_mk_meta_eq o #pcr_cr_eq o the o #pcr_info) data :: l)
469 val table = Lifting_Info.get_quotients ctxt
471 Symtab.fold (fn (_, data) => fn l => collect data l) table []
474 fun assms_rewr_conv tactic rule ct =
476 fun prove_extra_assms thm =
478 val assms = cprems_of thm
479 fun finish thm = if Thm.no_prems thm then SOME (Goal.conclude thm) else NONE
480 fun prove ctm = Option.mapPartial finish (SINGLE tactic (Goal.init ctm))
482 map_interrupt prove assms
485 fun cconl_of thm = Drule.strip_imp_concl (cprop_of thm)
486 fun lhs_of thm = fst (Thm.dest_equals (cconl_of thm))
487 fun rhs_of thm = snd (Thm.dest_equals (cconl_of thm))
488 val rule1 = Thm.incr_indexes (#maxidx (Thm.rep_cterm ct) + 1) rule;
489 val lhs = lhs_of rule1;
490 val rule2 = Thm.rename_boundvars (Thm.term_of lhs) (Thm.term_of ct) rule1;
492 Thm.instantiate (Thm.match (lhs, ct)) rule2
493 handle Pattern.MATCH => raise CTERM ("assms_rewr_conv", [lhs, ct]);
494 val proved_assms = prove_extra_assms rule3
499 val rule3 = proved_assms MRSL rule3
501 if lhs_of rule3 aconvc ct then rule3
503 let val ceq = Thm.dest_fun2 (Thm.cprop_of rule3)
504 in rule3 COMP Thm.trivial (Thm.mk_binop ceq ct (rhs_of rule3)) end
505 in Thm.transitive rule4 (Thm.beta_conversion true (rhs_of rule4)) end
506 | NONE => Conv.no_conv ct
509 fun assms_rewrs_conv tactic rules = Conv.first_conv (map (assms_rewr_conv tactic) rules)
511 fun simp_arrows_conv ctm =
513 val unfold_conv = Conv.rewrs_conv
514 [@{thm rel_fun_eq_eq_onp[THEN eq_reflection]},
515 @{thm rel_fun_eq_onp_rel[THEN eq_reflection]},
516 @{thm rel_fun_eq[THEN eq_reflection]},
517 @{thm rel_fun_eq_rel[THEN eq_reflection]},
518 @{thm rel_fun_def[THEN eq_reflection]}]
519 fun binop_conv2 cv1 cv2 = Conv.combination_conv (Conv.arg_conv cv1) cv2
520 val eq_onp_assms_tac_rules = @{thm left_unique_OO} ::
521 eq_onp_assms_tac_fixed_rules @ (Transfer.get_transfer_raw lthy)
522 val eq_onp_assms_tac = (TRY o REPEAT_ALL_NEW (resolve_tac eq_onp_assms_tac_rules)
523 THEN_ALL_NEW (DETERM o Transfer.eq_tac lthy)) 1
524 val relator_eq_onp_conv = Conv.bottom_conv
525 (K (Conv.try_conv (assms_rewrs_conv eq_onp_assms_tac
526 (Lifting_Info.get_relator_eq_onp_rules lthy)))) lthy
527 val relator_eq_conv = Conv.bottom_conv
528 (K (Conv.try_conv (Conv.rewrs_conv (Transfer.get_relator_eq lthy)))) lthy
530 case (Thm.term_of ctm) of
531 Const (@{const_name "rel_fun"}, _) $ _ $ _ =>
532 (binop_conv2 simp_arrows_conv simp_arrows_conv then_conv unfold_conv) ctm
533 | _ => (relator_eq_onp_conv then_conv relator_eq_conv) ctm
536 val unfold_ret_val_invs = Conv.bottom_conv
537 (K (Conv.try_conv (Conv.rewr_conv @{thm eq_onp_same_args[THEN eq_reflection]}))) lthy
538 val cr_to_pcr_conv = Raw_Simplifier.rewrite lthy false (get_cr_pcr_eqs lthy)
539 val unfold_inv_conv =
540 Conv.top_sweep_conv (K (Conv.rewr_conv @{thm eq_onp_def[THEN eq_reflection]})) lthy
541 val simp_conv = HOLogic.Trueprop_conv (Conv.fun2_conv
542 (cr_to_pcr_conv then_conv simp_arrows_conv))
543 val univq_conv = Conv.rewr_conv @{thm HOL.all_simps(6)[symmetric, THEN eq_reflection]}
544 val univq_prenex_conv = Conv.top_conv (K (Conv.try_conv univq_conv)) lthy
545 val beta_conv = Thm.beta_conversion true
547 (simp_conv then_conv univq_prenex_conv then_conv beta_conv then_conv unfold_ret_val_invs
548 then_conv unfold_inv_conv) ctm
550 Object_Logic.rulify lthy (eq_thm RS Drule.equal_elim_rule2)
554 fun rename_to_tnames ctxt term =
556 fun all_typs (Const (@{const_name Pure.all}, _) $ Abs (_, T, t)) = T :: all_typs t
559 fun rename (Const (@{const_name Pure.all}, T1) $ Abs (_, T2, t)) (new_name :: names) =
560 (Const (@{const_name Pure.all}, T1) $ Abs (new_name, T2, rename t names))
563 val (fixed_def_t, _) = yield_singleton (Variable.importT_terms) term ctxt
564 val new_names = Datatype_Prop.make_tnames (all_typs fixed_def_t)
566 rename term new_names
571 lifting_definition command. It opens a proof of a corresponding respectfulness
572 theorem in a user-friendly, readable form. Then add_lift_def is called internally.
576 fun lift_def_cmd (raw_var, rhs_raw, par_xthms) lthy =
578 val ((binding, SOME qty, mx), lthy) = yield_singleton Proof_Context.read_vars raw_var lthy
579 val rhs = (Syntax.check_term lthy o Syntax.parse_term lthy) rhs_raw
580 val rsp_rel = Lifting_Term.equiv_relation lthy (fastype_of rhs, qty)
581 val rty_forced = (domain_type o fastype_of) rsp_rel;
582 val forced_rhs = force_rty_type lthy rty_forced rhs;
583 val internal_rsp_tm = HOLogic.mk_Trueprop (rsp_rel $ forced_rhs $ forced_rhs)
584 val opt_proven_rsp_thm = try_prove_reflexivity lthy internal_rsp_tm
585 val par_thms = Attrib.eval_thms lthy par_xthms
587 fun after_qed internal_rsp_thm lthy =
588 add_lift_def (binding, mx) qty rhs internal_rsp_thm par_thms lthy
591 case opt_proven_rsp_thm of
592 SOME thm => Proof.theorem NONE (K (after_qed thm)) [] lthy
595 val readable_rsp_thm_eq = mk_readable_rsp_thm_eq internal_rsp_tm lthy
596 val (readable_rsp_tm, _) = Logic.dest_implies (prop_of readable_rsp_thm_eq)
597 val readable_rsp_tm_tnames = rename_to_tnames lthy readable_rsp_tm
599 fun after_qed' thm_list lthy =
601 val internal_rsp_thm = Goal.prove lthy [] [] internal_rsp_tm
602 (fn {context = ctxt, ...} =>
603 rtac readable_rsp_thm_eq 1 THEN Proof_Context.fact_tac ctxt (hd thm_list) 1)
605 after_qed internal_rsp_thm lthy
608 Proof.theorem NONE after_qed' [[(readable_rsp_tm_tnames,[])]] lthy
612 fun quot_thm_err ctxt (rty, qty) pretty_msg =
614 val error_msg = cat_lines
615 ["Lifting failed for the following types:",
616 Pretty.string_of (Pretty.block
617 [Pretty.str "Raw type:", Pretty.brk 2, Syntax.pretty_typ ctxt rty]),
618 Pretty.string_of (Pretty.block
619 [Pretty.str "Abstract type:", Pretty.brk 2, Syntax.pretty_typ ctxt qty]),
621 (Pretty.string_of (Pretty.block
622 [Pretty.str "Reason:", Pretty.brk 2, pretty_msg]))]
627 fun check_rty_err ctxt (rty_schematic, rty_forced) (raw_var, rhs_raw) =
629 val (_, ctxt') = yield_singleton Proof_Context.read_vars raw_var ctxt
630 val rhs = (Syntax.check_term ctxt' o Syntax.parse_term ctxt') rhs_raw
631 val error_msg = cat_lines
632 ["Lifting failed for the following term:",
633 Pretty.string_of (Pretty.block
634 [Pretty.str "Term:", Pretty.brk 2, Syntax.pretty_term ctxt rhs]),
635 Pretty.string_of (Pretty.block
636 [Pretty.str "Type:", Pretty.brk 2, Syntax.pretty_typ ctxt rty_schematic]),
638 (Pretty.string_of (Pretty.block
639 [Pretty.str "Reason:",
641 Pretty.str "The type of the term cannot be instantiated to",
643 Pretty.quote (Syntax.pretty_typ ctxt rty_forced),
649 fun lift_def_cmd_with_err_handling (raw_var, rhs_raw, par_xthms) lthy =
650 (lift_def_cmd (raw_var, rhs_raw, par_xthms) lthy
651 handle Lifting_Term.QUOT_THM (rty, qty, msg) => quot_thm_err lthy (rty, qty) msg)
652 handle Lifting_Term.CHECK_RTY (rty_schematic, rty_forced) =>
653 check_rty_err lthy (rty_schematic, rty_forced) (raw_var, rhs_raw)
655 (* parser and command *)
657 (((Parse.binding -- (@{keyword "::"} |-- (Parse.typ >> SOME) -- Parse.opt_mixfix')) >> Parse.triple2)
658 --| @{keyword "is"} -- Parse.term --
659 Scan.optional (@{keyword "parametric"} |-- Parse.!!! Parse_Spec.xthms1) []) >> Parse.triple1
661 Outer_Syntax.local_theory_to_proof @{command_spec "lift_definition"}
662 "definition for constants over the quotient type"
663 (liftdef_parser >> lift_def_cmd_with_err_handling)