renamed Variable.import_thms to Variable.import (back again cf. ed7aa5a350ef -- Alice is no longer supported);
renamed Variable.importT_thms to Variable.importT (again);
1 (* Title: Pure/Isar/element.ML
4 Explicit data structures for some Isar language elements, with derived
10 datatype ('typ, 'term) stmt =
11 Shows of (Attrib.binding * ('term * 'term list) list) list |
12 Obtains of (binding * ((binding * 'typ option) list * 'term list)) list
13 type statement = (string, string) stmt
14 type statement_i = (typ, term) stmt
15 datatype ('typ, 'term, 'fact) ctxt =
16 Fixes of (binding * 'typ option * mixfix) list |
17 Constrains of (string * 'typ) list |
18 Assumes of (Attrib.binding * ('term * 'term list) list) list |
19 Defines of (Attrib.binding * ('term * 'term list)) list |
20 Notes of string * (Attrib.binding * ('fact * Attrib.src list) list) list
21 type context = (string, string, Facts.ref) ctxt
22 type context_i = (typ, term, thm list) ctxt
23 val facts_map: (('typ, 'term, 'fact) ctxt -> ('a, 'b, 'c) ctxt) ->
24 (Attrib.binding * ('fact * Attrib.src list) list) list ->
25 (Attrib.binding * ('c * Attrib.src list) list) list
26 val map_ctxt: {binding: binding -> binding, typ: 'typ -> 'a, term: 'term -> 'b,
27 pattern: 'term -> 'b, fact: 'fact -> 'c, attrib: Attrib.src -> Attrib.src} ->
28 ('typ, 'term, 'fact) ctxt -> ('a, 'b, 'c) ctxt
29 val map_ctxt_attrib: (Attrib.src -> Attrib.src) ->
30 ('typ, 'term, 'fact) ctxt -> ('typ, 'term, 'fact) ctxt
31 val morph_ctxt: morphism -> context_i -> context_i
32 val pretty_stmt: Proof.context -> statement_i -> Pretty.T list
33 val pretty_ctxt: Proof.context -> context_i -> Pretty.T list
34 val pretty_statement: Proof.context -> string -> thm -> Pretty.T
36 val prove_witness: Proof.context -> term -> tactic -> witness
37 val witness_proof: (witness list list -> Proof.context -> Proof.context) ->
38 term list list -> Proof.context -> Proof.state
39 val witness_proof_eqs: (witness list list -> thm list -> Proof.context -> Proof.context) ->
40 term list list -> term list -> Proof.context -> Proof.state
41 val witness_local_proof: (witness list list -> Proof.state -> Proof.state) ->
42 string -> term list list -> Proof.context -> bool -> Proof.state -> Proof.state
43 val morph_witness: morphism -> witness -> witness
44 val conclude_witness: witness -> thm
45 val pretty_witness: Proof.context -> witness -> Pretty.T
46 val instT_type: typ Symtab.table -> typ -> typ
47 val instT_term: typ Symtab.table -> term -> term
48 val instT_thm: theory -> typ Symtab.table -> thm -> thm
49 val instT_morphism: theory -> typ Symtab.table -> morphism
50 val inst_term: typ Symtab.table * term Symtab.table -> term -> term
51 val inst_thm: theory -> typ Symtab.table * term Symtab.table -> thm -> thm
52 val inst_morphism: theory -> typ Symtab.table * term Symtab.table -> morphism
53 val satisfy_thm: witness list -> thm -> thm
54 val satisfy_morphism: witness list -> morphism
55 val satisfy_facts: witness list ->
56 (Attrib.binding * (thm list * Attrib.src list) list) list ->
57 (Attrib.binding * (thm list * Attrib.src list) list) list
58 val generalize_facts: Proof.context -> Proof.context ->
59 (Attrib.binding * (thm list * Attrib.src list) list) list ->
60 (Attrib.binding * (thm list * Attrib.src list) list) list
61 val eq_morphism: theory -> thm list -> morphism
62 val transfer_morphism: theory -> morphism
63 val init: context_i -> Context.generic -> Context.generic
64 val activate_i: context_i -> Proof.context -> context_i * Proof.context
65 val activate: (typ, term, Facts.ref) ctxt -> Proof.context -> context_i * Proof.context
68 structure Element: ELEMENT =
71 (** language elements **)
75 datatype ('typ, 'term) stmt =
76 Shows of (Attrib.binding * ('term * 'term list) list) list |
77 Obtains of (binding * ((binding * 'typ option) list * 'term list)) list;
79 type statement = (string, string) stmt;
80 type statement_i = (typ, term) stmt;
85 datatype ('typ, 'term, 'fact) ctxt =
86 Fixes of (binding * 'typ option * mixfix) list |
87 Constrains of (string * 'typ) list |
88 Assumes of (Attrib.binding * ('term * 'term list) list) list |
89 Defines of (Attrib.binding * ('term * 'term list)) list |
90 Notes of string * (Attrib.binding * ('fact * Attrib.src list) list) list;
92 type context = (string, string, Facts.ref) ctxt;
93 type context_i = (typ, term, thm list) ctxt;
95 fun facts_map f facts = Notes ("", facts) |> f |> (fn Notes (_, facts') => facts');
97 fun map_ctxt {binding, typ, term, pattern, fact, attrib} =
98 fn Fixes fixes => Fixes (fixes |> map (fn (x, T, mx) => (binding x, Option.map typ T, mx)))
99 | Constrains xs => Constrains (xs |> map (fn (x, T) =>
100 (Name.of_binding (binding (Binding.name x)), typ T)))
101 | Assumes asms => Assumes (asms |> map (fn ((a, atts), propps) =>
102 ((binding a, map attrib atts), propps |> map (fn (t, ps) => (term t, map pattern ps)))))
103 | Defines defs => Defines (defs |> map (fn ((a, atts), (t, ps)) =>
104 ((binding a, map attrib atts), (term t, map pattern ps))))
105 | Notes (kind, facts) => Notes (kind, facts |> map (fn ((a, atts), bs) =>
106 ((binding a, map attrib atts), bs |> map (fn (ths, btts) => (fact ths, map attrib btts)))));
108 fun map_ctxt_attrib attrib =
109 map_ctxt {binding = I, typ = I, term = I, pattern = I, fact = I, attrib = attrib};
111 fun morph_ctxt phi = map_ctxt
112 {binding = Morphism.binding phi,
113 typ = Morphism.typ phi,
114 term = Morphism.term phi,
115 pattern = Morphism.term phi,
116 fact = Morphism.fact phi,
117 attrib = Args.morph_values phi};
121 (** pretty printing **)
123 fun pretty_items _ _ [] = []
124 | pretty_items keyword sep (x :: ys) =
125 Pretty.block [Pretty.keyword keyword, Pretty.brk 1, x] ::
126 map (fn y => Pretty.block [Pretty.str " ", Pretty.keyword sep, Pretty.brk 1, y]) ys;
128 fun pretty_name_atts ctxt (b, atts) sep =
129 if Binding.is_empty b andalso null atts then []
130 else [Pretty.block (Pretty.breaks
131 (Pretty.str (Binding.str_of b) :: Attrib.pretty_attribs ctxt atts @ [Pretty.str sep]))];
136 fun pretty_stmt ctxt =
138 val prt_typ = Pretty.quote o Syntax.pretty_typ ctxt;
139 val prt_term = Pretty.quote o Syntax.pretty_term ctxt;
140 val prt_terms = separate (Pretty.keyword "and") o map prt_term;
141 val prt_name_atts = pretty_name_atts ctxt;
143 fun prt_show (a, ts) =
144 Pretty.block (Pretty.breaks (prt_name_atts a ":" @ prt_terms (map fst ts)));
146 fun prt_var (x, SOME T) = Pretty.block
147 [Pretty.str (Binding.name_of x ^ " ::"), Pretty.brk 1, prt_typ T]
148 | prt_var (x, NONE) = Pretty.str (Binding.name_of x);
149 val prt_vars = separate (Pretty.keyword "and") o map prt_var;
151 fun prt_obtain (_, ([], ts)) = Pretty.block (Pretty.breaks (prt_terms ts))
152 | prt_obtain (_, (xs, ts)) = Pretty.block (Pretty.breaks
153 (prt_vars xs @ [Pretty.keyword "where"] @ prt_terms ts));
155 fn Shows shows => pretty_items "shows" "and" (map prt_show shows)
156 | Obtains obtains => pretty_items "obtains" "|" (map prt_obtain obtains)
162 fun pretty_ctxt ctxt =
164 val prt_typ = Pretty.quote o Syntax.pretty_typ ctxt;
165 val prt_term = Pretty.quote o Syntax.pretty_term ctxt;
166 val prt_thm = Pretty.backquote o ProofContext.pretty_thm ctxt;
167 val prt_name_atts = pretty_name_atts ctxt;
169 fun prt_mixfix NoSyn = []
170 | prt_mixfix mx = [Pretty.brk 2, Syntax.pretty_mixfix mx];
172 fun prt_fix (x, SOME T, mx) = Pretty.block (Pretty.str (Binding.name_of x ^ " ::") ::
173 Pretty.brk 1 :: prt_typ T :: Pretty.brk 1 :: prt_mixfix mx)
174 | prt_fix (x, NONE, mx) = Pretty.block (Pretty.str (Binding.name_of x) ::
175 Pretty.brk 1 :: prt_mixfix mx);
176 fun prt_constrain (x, T) = prt_fix (Binding.name x, SOME T, NoSyn);
178 fun prt_asm (a, ts) =
179 Pretty.block (Pretty.breaks (prt_name_atts a ":" @ map (prt_term o fst) ts));
180 fun prt_def (a, (t, _)) =
181 Pretty.block (Pretty.breaks (prt_name_atts a ":" @ [prt_term t]));
183 fun prt_fact (ths, []) = map prt_thm ths
184 | prt_fact (ths, atts) = Pretty.enclose "(" ")"
185 (Pretty.breaks (map prt_thm ths)) :: Attrib.pretty_attribs ctxt atts;
186 fun prt_note (a, ths) =
187 Pretty.block (Pretty.breaks (flat (prt_name_atts a "=" :: map prt_fact ths)));
189 fn Fixes fixes => pretty_items "fixes" "and" (map prt_fix fixes)
190 | Constrains xs => pretty_items "constrains" "and" (map prt_constrain xs)
191 | Assumes asms => pretty_items "assumes" "and" (map prt_asm asms)
192 | Defines defs => pretty_items "defines" "and" (map prt_def defs)
193 | Notes ("", facts) => pretty_items "notes" "and" (map prt_note facts)
194 | Notes (kind, facts) => pretty_items ("notes " ^ kind) "and" (map prt_note facts)
198 (* pretty_statement *)
202 fun thm_name kind th prts =
204 if Thm.has_name_hint th then
205 Pretty.block [Pretty.command kind,
206 Pretty.brk 1, Pretty.str (Long_Name.base_name (Thm.get_name_hint th) ^ ":")]
207 else Pretty.command kind
208 in Pretty.block (Pretty.fbreaks (head :: prts)) end;
210 fun fix (x, T) = (Binding.name x, SOME T);
212 fun obtain prop ctxt =
214 val ((xs, prop'), ctxt') = Variable.focus prop ctxt;
215 val As = Logic.strip_imp_prems (Thm.term_of prop');
216 in ((Binding.empty, (map (fix o Term.dest_Free o Thm.term_of) xs, As)), ctxt') end;
220 fun pretty_statement ctxt kind raw_th =
222 val thy = ProofContext.theory_of ctxt;
223 val cert = Thm.cterm_of thy;
225 val th = MetaSimplifier.norm_hhf raw_th;
226 val is_elim = ObjectLogic.is_elim th;
228 val ((_, [th']), ctxt') = Variable.import true [th] (Variable.set_body false ctxt);
229 val prop = Thm.prop_of th';
230 val (prems, concl) = Logic.strip_horn prop;
231 val concl_term = ObjectLogic.drop_judgment thy concl;
233 val fixes = fold_aterms (fn v as Free (x, T) =>
234 if Variable.newly_fixed ctxt' ctxt x andalso not (v aconv concl_term)
235 then insert (op =) (x, T) else I | _ => I) prop [] |> rev;
236 val (assumes, cases) = take_suffix (fn prem =>
237 is_elim andalso concl aconv Logic.strip_assums_concl prem) prems;
239 pretty_ctxt ctxt' (Fixes (map (fn (x, T) => (Binding.name x, SOME T, NoSyn)) fixes)) @
240 pretty_ctxt ctxt' (Assumes (map (fn t => (Attrib.empty_binding, [(t, [])])) assumes)) @
241 (if null cases then pretty_stmt ctxt' (Shows [(Attrib.empty_binding, [(concl, [])])])
243 let val (clauses, ctxt'') = fold_map (obtain o cert) cases ctxt'
244 in pretty_stmt ctxt'' (Obtains clauses) end)
245 end |> thm_name kind raw_th;
251 (** logical operations **)
253 (* witnesses -- hypotheses as protected facts *)
255 datatype witness = Witness of term * thm;
257 val mark_witness = Logic.protect;
258 fun witness_prop (Witness (t, _)) = t;
259 fun witness_hyps (Witness (_, th)) = #hyps (Thm.rep_thm th);
260 fun map_witness f (Witness witn) = Witness (f witn);
262 fun morph_witness phi = map_witness (fn (t, th) => (Morphism.term phi t, Morphism.thm phi th));
264 fun prove_witness ctxt t tac =
265 Witness (t, Thm.close_derivation (Goal.prove ctxt [] [] (mark_witness t) (fn _ =>
266 Tactic.rtac Drule.protectI 1 THEN tac)));
272 Proof.refine (Method.Basic (K (RAW_METHOD
275 (CONJUNCTS (TRYALL (Tactic.rtac Drule.protectI)))))))), Position.none));
277 fun gen_witness_proof proof after_qed wit_propss eq_props =
279 val propss = (map o map) (fn prop => (mark_witness prop, [])) wit_propss
280 @ [map (rpair []) eq_props];
281 fun after_qed' thmss =
282 let val (wits, eqs) = split_last ((map o map) Thm.close_derivation thmss);
283 in after_qed ((map2 o map2) (curry Witness) wit_propss wits) eqs end;
284 in proof after_qed' propss #> refine_witness #> Seq.hd end;
288 fun witness_proof after_qed wit_propss =
289 gen_witness_proof (Proof.theorem_i NONE) (fn wits => fn _ => after_qed wits)
292 val witness_proof_eqs = gen_witness_proof (Proof.theorem_i NONE);
294 fun witness_local_proof after_qed cmd wit_propss goal_ctxt int =
295 gen_witness_proof (fn after_qed' => fn propss =>
296 Proof.map_context (K goal_ctxt)
297 #> Proof.local_goal (ProofDisplay.print_results int) (K I) ProofContext.bind_propp_i
298 cmd NONE after_qed' (map (pair Thm.empty_binding) propss))
299 (fn wits => fn _ => after_qed wits) wit_propss [];
304 fun compose_witness (Witness (_, th)) r =
306 val th' = Goal.conclude th;
307 val A = Thm.cprem_of r 1;
310 (Conv.gconv_rule Drule.beta_eta_conversion 1 r)
311 (Conv.fconv_rule Drule.beta_eta_conversion
312 (Thm.instantiate (Thm.match (Thm.cprop_of th', A)) th'))
315 fun conclude_witness (Witness (_, th)) =
316 Thm.close_derivation (MetaSimplifier.norm_hhf_protect (Goal.conclude th));
318 fun pretty_witness ctxt witn =
319 let val prt_term = Pretty.quote o Syntax.pretty_term ctxt in
320 Pretty.block (prt_term (witness_prop witn) ::
321 (if ! show_hyps then [Pretty.brk 2, Pretty.list "[" "]"
322 (map prt_term (witness_hyps witn))] else []))
328 fun instantiate_tfrees thy subst th =
330 val certT = Thm.ctyp_of thy;
331 val idx = Thm.maxidx_of th + 1;
332 fun cert_inst (a, (S, T)) = (certT (TVar ((a, idx), S)), certT T);
334 fun add_inst (a, S) insts =
335 if AList.defined (op =) insts a then insts
336 else (case AList.lookup (op =) subst a of NONE => insts | SOME T => (a, (S, T)) :: insts);
338 Term.fold_types (Term.fold_atyps (fn TFree v => add_inst v | _ => I))
339 (Thm.full_prop_of th) [];
342 |> Thm.generalize (map fst insts, []) idx
343 |> Thm.instantiate (map cert_inst insts, [])
346 fun instantiate_frees thy subst =
347 let val cert = Thm.cterm_of thy in
348 Drule.forall_intr_list (map (cert o Free o fst) subst) #>
349 Drule.forall_elim_list (map (cert o snd) subst)
352 fun hyps_rule rule th =
353 let val {hyps, ...} = Thm.crep_thm th in
354 Drule.implies_elim_list
355 (rule (Drule.implies_intr_list hyps th))
356 (map (Thm.assume o Drule.cterm_rule rule) hyps)
360 (* instantiate types *)
363 if Symtab.is_empty env then I
364 else Term.map_type_tfree (fn (x, S) => the_default (TFree (x, S)) (Symtab.lookup env x));
367 if Symtab.is_empty env then I
368 else Term.map_types (instT_type env);
370 fun instT_subst env th = (Thm.fold_terms o Term.fold_types o Term.fold_atyps)
371 (fn T as TFree (a, _) =>
372 let val T' = the_default T (Symtab.lookup env a)
373 in if T = T' then I else insert (op =) (a, T') end
376 fun instT_thm thy env th =
377 if Symtab.is_empty env then th
379 let val subst = instT_subst env th
380 in if null subst then th else th |> hyps_rule (instantiate_tfrees thy subst) end;
382 fun instT_morphism thy env =
383 let val thy_ref = Theory.check_thy thy in
386 typ = instT_type env,
387 term = instT_term env,
388 fact = map (fn th => instT_thm (Theory.deref thy_ref) env th)}
392 (* instantiate types and terms *)
394 fun inst_term (envT, env) =
395 if Symtab.is_empty env then instT_term envT
398 val instT = instT_type envT;
399 fun inst (Const (x, T)) = Const (x, instT T)
400 | inst (Free (x, T)) =
401 (case Symtab.lookup env x of
402 NONE => Free (x, instT T)
404 | inst (Var (xi, T)) = Var (xi, instT T)
405 | inst (b as Bound _) = b
406 | inst (Abs (x, T, t)) = Abs (x, instT T, inst t)
407 | inst (t $ u) = inst t $ inst u;
408 in Envir.beta_norm o inst end;
410 fun inst_thm thy (envT, env) th =
411 if Symtab.is_empty env then instT_thm thy envT th
414 val substT = instT_subst envT th;
415 val subst = (Thm.fold_terms o Term.fold_aterms)
418 val T' = instT_type envT T;
419 val t = Free (x, T');
420 val t' = the_default t (Symtab.lookup env x);
421 in if t aconv t' then I else insert (eq_fst (op =)) ((x, T'), t') end
424 if null substT andalso null subst then th
426 (instantiate_tfrees thy substT #>
427 instantiate_frees thy subst #>
428 Conv.fconv_rule (Thm.beta_conversion true))
431 fun inst_morphism thy envs =
432 let val thy_ref = Theory.check_thy thy in
435 typ = instT_type (#1 envs),
436 term = inst_term envs,
437 fact = map (fn th => inst_thm (Theory.deref thy_ref) envs th)}
441 (* satisfy hypotheses *)
443 fun satisfy_thm witns thm = thm |> fold (fn hyp =>
444 (case find_first (fn Witness (t, _) => Thm.term_of hyp aconv t) witns of
446 | SOME w => Thm.implies_intr hyp #> compose_witness w)) (#hyps (Thm.crep_thm thm));
448 val satisfy_morphism = Morphism.thm_morphism o satisfy_thm;
449 val satisfy_facts = facts_map o morph_ctxt o satisfy_morphism;
452 (* rewriting with equalities *)
454 fun eq_morphism thy thms = Morphism.morphism
457 term = MetaSimplifier.rewrite_term thy thms [],
458 fact = map (MetaSimplifier.rewrite_rule thms)};
461 (* generalize type/term parameters *)
463 val maxidx_atts = fold Args.maxidx_values;
465 fun generalize_facts inner outer facts =
467 val thy = ProofContext.theory_of inner;
469 fold (fn ((_, atts), bs) => maxidx_atts atts #> fold (maxidx_atts o #2) bs) facts ~1;
470 val exp_fact = map (Thm.adjust_maxidx_thm maxidx) #> Variable.export inner outer;
471 val exp_term = Drule.term_rule thy (singleton exp_fact);
472 val exp_typ = Logic.type_map exp_term;
473 val morphism = Morphism.morphism {binding = I, typ = exp_typ, term = exp_term, fact = exp_fact};
474 in facts_map (morph_ctxt morphism) facts end;
477 (* transfer to theory using closure *)
479 fun transfer_morphism thy =
480 let val thy_ref = Theory.check_thy thy
481 in Morphism.thm_morphism (fn th => transfer (Theory.deref thy_ref) th) end;
485 (** activate in context **)
489 fun init (Fixes fixes) = Context.map_proof (ProofContext.add_fixes fixes #> #2)
490 | init (Constrains _) = I
491 | init (Assumes asms) = Context.map_proof (fn ctxt =>
493 val asms' = Attrib.map_specs (Attrib.attribute_i (ProofContext.theory_of ctxt)) asms;
494 val (_, ctxt') = ctxt
495 |> fold Variable.auto_fixes (maps (map #1 o #2) asms')
496 |> ProofContext.add_assms_i Assumption.assume_export asms';
498 | init (Defines defs) = Context.map_proof (fn ctxt =>
500 val defs' = Attrib.map_specs (Attrib.attribute_i (ProofContext.theory_of ctxt)) defs;
501 val asms = defs' |> map (fn ((name, atts), (t, ps)) =>
502 let val ((c, _), t') = LocalDefs.cert_def ctxt t (* FIXME adapt ps? *)
503 in (t', ((Thm.def_binding_optional (Binding.name c) name, atts), [(t', ps)])) end);
504 val (_, ctxt') = ctxt
505 |> fold Variable.auto_fixes (map #1 asms)
506 |> ProofContext.add_assms_i LocalDefs.def_export (map #2 asms);
508 | init (Notes (kind, facts)) = (fn context =>
510 val facts' = Attrib.map_facts (Attrib.attribute_i (Context.theory_of context)) facts;
511 val context' = context |> Context.mapping
512 (PureThy.note_thmss kind facts' #> #2)
513 (ProofContext.note_thmss kind facts' #> #2);
519 fun activate_i elem ctxt =
521 val elem' = map_ctxt_attrib Args.assignable elem;
522 val ctxt' = Context.proof_map (init elem') ctxt;
523 in (map_ctxt_attrib Args.closure elem', ctxt') end;
525 fun activate raw_elem ctxt =
526 let val elem = raw_elem |> map_ctxt
527 {binding = tap Name.of_binding,
531 fact = ProofContext.get_fact ctxt,
532 attrib = Attrib.intern_src (ProofContext.theory_of ctxt)}
533 in activate_i elem ctxt end;