1 (* Copyright (C) 2003-2005, HELM Team.
3 * This file is part of HELM, an Hypertextual, Electronic
4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
7 * HELM is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
12 * HELM is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with HELM; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22 * For details, see the HELM World-Wide-Web page,
23 * http://cs.unibo.it/helm/.
28 module S = CicSubstitution
29 module TC = CicTypeChecker
31 module UM = UriManager
32 module Obj = LibraryObjects
35 module E = CicEnvironment
37 module PEH = ProofEngineHelpers
39 module DTI = DoubleTypeInference
40 module NU = CicNotationUtil
44 module Cl = ProceduralClassify
45 module T = ProceduralTypes
46 module Cn = ProceduralConversion
47 module H = ProceduralHelpers
50 sorts : (C.id, A.sort_kind) Hashtbl.t;
51 types : (C.id, A.anntypes) Hashtbl.t;
52 params : G.inline_param list;
53 max_depth: int option;
62 (* helpers ******************************************************************)
64 let split2_last l1 l2 =
66 let n = pred (List.length l1) in
67 let before1, after1 = HEL.split_nth n l1 in
68 let before2, after2 = HEL.split_nth n l2 in
69 before1, before2, List.hd after1, List.hd after2
70 with Invalid_argument _ -> failwith "A2P.split2_last"
72 let string_of_head = function
74 | C.AConst _ -> "const"
75 | C.AMutInd _ -> "mutind"
76 | C.AMutConstruct _ -> "mutconstruct"
80 | C.ALambda _ -> "lambda"
81 | C.ALetIn _ -> "letin"
83 | C.ACoFix _ -> "cofix"
86 | C.AMutCase _ -> "mutcase"
88 | C.AImplicit _ -> "implict"
90 let next st = {st with depth = succ st.depth}
92 let add st entry = {st with context = entry :: st.context}
94 let push st = {st with case = 1 :: st.case}
97 {st with case = match st.case with
99 | hd :: tl -> succ hd :: tl
103 let case = String.concat "." (List.rev_map string_of_int st.case) in
104 Printf.sprintf "case %s: %s" case str
108 let msg = Printf.sprintf "Depth %u: " st.depth in
109 match st.max_depth with
111 | Some d -> if st.depth < d then true, msg else false, "DEPTH EXCEDED: "
112 with Invalid_argument _ -> failwith "A2P.test_depth"
114 let is_rewrite_right st = function
115 | C.AConst (_, uri, []) -> st.defaults && Obj.is_eq_ind_r_URI uri
118 let is_rewrite_left st = function
119 | C.AConst (_, uri, []) -> st.defaults && Obj.is_eq_ind_URI uri
122 let is_fwd_rewrite_right st hd tl =
123 if is_rewrite_right st hd then match List.nth tl 3 with
128 let is_fwd_rewrite_left st hd tl =
129 if is_rewrite_left st hd then match List.nth tl 3 with
134 let get_inner_types st v =
136 let id = Ut.id_of_annterm v in
137 try match Hashtbl.find st.types id with
138 | {A.annsynthesized = st; A.annexpected = Some et} -> Some (st, et)
139 | {A.annsynthesized = st; A.annexpected = None} -> Some (st, st)
140 with Not_found -> None
141 with Invalid_argument _ -> failwith "A2P.get_inner_types"
143 let get_entry st id =
144 let rec aux = function
146 | Some (C.Name name, e) :: _ when name = id -> e
151 let string_of_atomic = function
152 | C.ARel (_, _, _, s) -> s
153 | C.AVar (_, uri, _) -> H.name_of_uri uri None None
154 | C.AConst (_, uri, _) -> H.name_of_uri uri None None
155 | C.AMutInd (_, uri, i, _) -> H.name_of_uri uri (Some i) None
156 | C.AMutConstruct (_, uri, i, j, _) -> H.name_of_uri uri (Some i) (Some j)
159 let get_sub_names head l =
160 let s = string_of_atomic head in
161 if s = "" then [] else
162 let map (names, i) _ =
163 let name = Printf.sprintf "%s_%u" s i in name :: names, succ i
165 let names, _ = List.fold_left map ([], 1) l in
168 let get_type msg st t = H.get_type msg st.context (H.cic t)
170 (* proof construction *******************************************************)
172 let anonymous_premise = C.Name "UNNAMED"
174 let mk_exp_args hd tl classes synth =
175 let meta id = C.AImplicit (id, None) in
177 if I.overlaps synth cl && b then v else meta ""
179 let rec aux b = function
182 if hd = meta "" then aux true tl else b, List.rev (hd :: tl)
184 let args = T.list_rev_map2 map tl classes in
185 let b, args = aux false args in
186 if args = [] then b, hd else b, C.AAppl ("", hd :: args)
188 let mk_convert st ?name sty ety note =
190 let a = ref "" in Ut.pp_term (fun s -> a := !a ^ s) [] st.context t; !a
192 let e = Cn.hole "" in
193 let csty, cety = H.cic sty, H.cic ety in
196 let sname = match name with None -> "" | Some (id, _) -> id in
197 Printf.sprintf "%s: %s\nSINTH: %s\nEXP: %s"
198 note sname (ppterm csty) (ppterm cety)
201 if H.alpha_equivalence ~flatten:true st.context csty cety then [T.Note note] else
202 let sty, ety = H.acic_bc st.context sty, H.acic_bc st.context ety in
204 | None -> [T.Change (sty, ety, None, e, note)]
206 begin match get_entry st id with
208 [T.Change (ety, sty, Some (id, Some id), e, note);
212 [T.Change (ety, sty, Some (id, Some id), e, note)]
215 let convert st ?name v =
216 match get_inner_types st v with
218 if !debug then [T.Note "NORMAL: NO INNER TYPES"] else []
219 | Some (sty, ety) -> mk_convert st ?name sty ety "NORMAL"
221 let get_intro = function
222 | C.Anonymous -> None
225 let mk_preamble st what script = match script with
226 | T.Exact _ :: _ -> script
227 | _ -> convert st what @ script
229 let mk_arg st = function
230 | C.ARel (_, _, i, name) as what -> convert st ~name:(name, i) what
233 let mk_fwd_rewrite st dtext name tl direction v t ity ety =
234 let compare premise = function
236 | Some s -> s = premise
238 assert (List.length tl = 6);
239 let what, where, predicate = List.nth tl 5, List.nth tl 3, List.nth tl 2 in
240 let e = Cn.mk_pattern 1 ety predicate in
241 if (Cn.does_not_occur e) then st, [] else
243 | C.ARel (_, _, i, premise) as w ->
245 let where = Some (premise, name) in
246 let script = mk_arg st what @ mk_arg st w in
247 T.Rewrite (direction, what, where, e, dtext) :: script
249 if DTI.does_not_occur (succ i) (H.cic t) || compare premise name then
250 {st with context = Cn.clear st.context premise}, script name
252 assert (Ut.is_sober st.context (H.cic ity));
253 let ity = H.acic_bc st.context ity in
254 let br1 = [T.Id ""] in
255 let br2 = List.rev (T.Exact (w, "assumption") :: script None) in
256 let text = "non-linear rewrite" in
257 st, [T.Branch ([br2; br1], ""); T.Cut (name, ity, text)]
261 let mk_rewrite st dtext where qs tl direction t ety =
262 assert (List.length tl = 5);
263 let predicate = List.nth tl 2 in
264 let e = Cn.mk_pattern 1 ety predicate in
265 let script = [T.Branch (qs, "")] in
266 if (Cn.does_not_occur e) then script else
267 T.Rewrite (direction, where, None, e, dtext) :: script
269 let rec proc_lambda st what name v t =
270 let name = match name with
271 | C.Anonymous -> H.mk_fresh_name true st.context anonymous_premise
274 let entry = Some (name, C.Decl (H.cic v)) in
275 let intro = get_intro name in
276 let script = proc_proof (add st entry) t in
277 let script = T.Intros (Some 1, [intro], "") :: script in
278 mk_preamble st what script
280 and proc_letin st what name v w t =
281 let intro = get_intro name in
282 let proceed, dtext = test_depth st in
283 let script = if proceed then
284 let st, hyp, rqv = match get_inner_types st what, get_inner_types st v with
285 | Some (C.ALetIn _, _), _ ->
286 st, C.Def (H.cic v, H.cic w), [T.Intros (Some 1, [intro], dtext)]
287 | _, Some (ity, ety) ->
288 let st, rqv = match v with
289 | C.AAppl (_, hd :: tl) when is_fwd_rewrite_right st hd tl ->
290 mk_fwd_rewrite st dtext intro tl true v t ity ety
291 | C.AAppl (_, hd :: tl) when is_fwd_rewrite_left st hd tl ->
292 mk_fwd_rewrite st dtext intro tl false v t ity ety
294 assert (Ut.is_sober st.context (H.cic ety));
295 let ety = H.acic_bc st.context ety in
296 let qs = [proc_proof (next st) v; [T.Id ""]] in
297 st, [T.Branch (qs, ""); T.Cut (intro, ety, dtext)]
299 st, C.Decl (H.cic ity), rqv
301 st, C.Def (H.cic v, H.cic w), [T.LetIn (intro, v, dtext)]
303 let entry = Some (name, hyp) in
304 let qt = proc_proof (next (add st entry)) t in
305 List.rev_append rqv qt
307 [T.Exact (what, dtext)]
309 mk_preamble st what script
311 and proc_rel st what =
312 let _, dtext = test_depth st in
313 let text = "assumption" in
314 let script = [T.Exact (what, dtext ^ text)] in
315 mk_preamble st what script
317 and proc_mutconstruct st what =
318 let _, dtext = test_depth st in
319 let script = [T.Exact (what, dtext)] in
320 mk_preamble st what script
322 and proc_const st what =
323 let _, dtext = test_depth st in
324 let script = [T.Exact (what, dtext)] in
325 mk_preamble st what script
327 and proc_appl st what hd tl =
328 let proceed, dtext = test_depth st in
329 let script = if proceed then
330 let ty = match get_inner_types st hd with
331 | Some (ity, _) -> H.cic ity
332 | None -> get_type "TC2" st hd
334 let classes, rc = Cl.classify st.context ty in
335 let goal_arity, goal = match get_inner_types st what with
338 snd (PEH.split_with_whd (st.context, H.cic ity)), Some (H.cic ety)
340 let parsno, argsno = List.length classes, List.length tl in
341 let decurry = parsno - argsno in
342 let diff = goal_arity - decurry in
344 let text = Printf.sprintf "partial application: %i" diff in
345 [T.Exact (what, dtext ^ text)]
347 let classes = Cl.adjust st.context tl ?goal classes in
348 let rec mk_synth a n =
349 if n < 0 then a else mk_synth (I.S.add n a) (pred n)
351 let synth = mk_synth I.S.empty decurry in
352 let text = "" (* Printf.sprintf "%u %s" parsno (Cl.to_string h) *) in
353 let script = List.rev (mk_arg st hd) in
354 let tactic b t n = if b then T.Apply (t, n) else T.Exact (t, n) in
356 | Some (i, j, uri, tyno) when decurry = 0 ->
357 let classes2, tl2, _, where = split2_last classes tl in
358 let script2 = List.rev (mk_arg st where) @ script in
359 let synth2 = I.S.add 1 synth in
360 let names = H.get_ind_names uri tyno in
361 let qs = proc_bkd_proofs (next st) synth2 names classes2 tl2 in
362 let ety = match get_inner_types st what with
363 | Some (_, ety) -> ety
365 Cn.fake_annotate "" st.context (get_type "TC3" st what)
367 if List.length qs <> List.length names then
368 let qs = proc_bkd_proofs (next st) synth [] classes tl in
369 let b, hd = mk_exp_args hd tl classes synth in
370 script @ [tactic b hd (dtext ^ text); T.Branch (qs, "")]
371 else if is_rewrite_right st hd then
372 script2 @ mk_rewrite st dtext where qs tl2 false what ety
373 else if is_rewrite_left st hd then
374 script2 @ mk_rewrite st dtext where qs tl2 true what ety
376 let predicate = List.nth tl2 (parsno - i) in
377 let e = Cn.mk_pattern j ety predicate in
378 let using = Some hd in
380 [T.Elim (where, using, e, dtext ^ text); T.Branch (qs, "")]
382 let names = get_sub_names hd tl in
383 let qs = proc_bkd_proofs (next st) synth names classes tl in
384 let b, hd = mk_exp_args hd tl classes synth in
385 script @ [tactic b hd (dtext ^ text); T.Branch (qs, "")]
387 [T.Exact (what, dtext)]
389 mk_preamble st what script
391 and proc_case st what uri tyno u v ts =
392 let proceed, dtext = test_depth st in
393 let script = if proceed then
394 let synth, classes = I.S.empty, Cl.make ts in
395 let names = H.get_ind_names uri tyno in
396 let qs = proc_bkd_proofs (next st) synth names classes ts in
397 let lpsno, _ = H.get_ind_type uri tyno in
398 let ps, _ = H.get_ind_parameters st.context (H.cic v) in
399 let _, rps = HEL.split_nth lpsno ps in
400 let rpsno = List.length rps in
401 let ety = match get_inner_types st what with
402 | Some (_, ety) -> ety
404 Cn.fake_annotate "" st.context (get_type "TC4" st what)
406 let e = Cn.mk_pattern rpsno ety u in
408 let script = List.rev (mk_arg st v) in
409 script @ [T.Cases (v, e, dtext ^ text); T.Branch (qs, "")]
411 [T.Exact (what, dtext)]
413 mk_preamble st what script
415 and proc_other st what =
416 let _, dtext = test_depth st in
417 let text = Printf.sprintf "%s: %s" "UNEXPANDED" (string_of_head what) in
418 let script = [T.Exact (what, dtext ^ text)] in
419 mk_preamble st what script
421 and proc_proof st t =
423 let xtypes, note = match get_inner_types st t with
424 | Some (it, et) -> Some (H.cic it, H.cic et),
425 (Printf.sprintf "\nInferred: %s\nExpected: %s"
426 (Pp.ppterm (H.cic it)) (Pp.ppterm (H.cic et)))
427 | None -> None, "\nNo types"
429 let context, _clears = Cn.get_clears st.context (H.cic t) xtypes in
430 {st with context = context}
433 | C.ALambda (_, name, w, t) as what -> proc_lambda (f st) what name w t
434 | C.ALetIn (_, name, v, w, t) as what -> proc_letin (f st) what name v w t
435 | C.ARel _ as what -> proc_rel (f st) what
436 | C.AMutConstruct _ as what -> proc_mutconstruct (f st) what
437 | C.AConst _ as what -> proc_const (f st) what
438 | C.AAppl (_, hd :: tl) as what -> proc_appl (f st) what hd tl
439 (* FG: we deactivate the tactic "cases" because it does not work properly
440 | C.AMutCase (_, uri, i, u, v, ts) as what -> proc_case (f st) what uri i u v ts
442 | what -> proc_other (f st) what
444 and proc_bkd_proofs st synth names classes ts =
446 let get_names b = ref (names, if b then push st else st) in
447 let get_note f b names =
450 | "" :: tl, st -> names := tl, st; f st
452 let note = case st hd in
454 if b then T.Note note :: f st else f st
456 let _, dtext = test_depth st in
458 if I.overlaps synth inv then None else
459 if I.S.is_empty inv then Some (get_note (fun st -> proc_proof st v)) else
460 Some (get_note (fun _ -> [T.Exact (v, dtext ^ "dependent")]))
462 let ps = T.list_map2_filter aux classes ts in
463 let b = List.length ps > 1 in
464 let names = get_names b in
465 List.rev_map (fun f -> f b names) ps
467 with Invalid_argument s -> failwith ("A2P.proc_bkd_proofs: " ^ s)
469 (* initialization ***********************************************************)
471 let init ~ids_to_inner_sorts ~ids_to_inner_types params context =
472 let depth_map x y = match x, y with
473 | None, G.IPDepth depth -> Some depth
477 sorts = ids_to_inner_sorts;
478 types = ids_to_inner_types;
480 max_depth = List.fold_left depth_map None params;
482 defaults = not (List.mem G.IPNoDefaults params);