2 ||M|| This file is part of HELM, an Hypertextual, Electronic
3 ||A|| Library of Mathematics, developed at the Computer Science
4 ||T|| Department, University of Bologna, Italy.
6 ||T|| HELM is free software; you can redistribute it and/or
7 ||A|| modify it under the terms of the GNU General Public License
8 \ / version 2 or (at your option) any later version.
9 \ / This software is distributed as is, NO WARRANTY.
10 V_______________________________________________________________ *)
12 (* $Id: nCic.ml 9058 2008-10-13 17:42:30Z tassi $ *)
14 exception Error of string lazy_t
15 let fail msg = raise (Error msg)
17 type lowtac_status = {
19 lstatus : LexiconEngine.status
22 type lowtactic = lowtac_status -> int -> lowtac_status
25 gstatus : Continuationals.Stack.t;
26 istatus : lowtac_status;
29 type tactic = tac_status -> tac_status
31 type tactic_term = CicNotationPt.term Disambiguate.disambiguator_input
32 type tactic_pattern = GrafiteAst.npattern Disambiguate.disambiguator_input
34 let pp_tac_status status =
35 prerr_endline (NCicPp.ppobj status.istatus.pstatus)
38 let pp_lowtac_status status =
39 prerr_endline "--------------------------------------------";
40 prerr_endline (NCicPp.ppobj status.pstatus)
43 type cic_term = NCic.conjecture (* name, context, term *)
44 let ctx_of (_,c,_) = c ;;
46 let relocate status destination (name,source,t as orig) =
47 if source == destination then status, orig else
48 let rec lcp j i = function
49 | (n1, t1)::cl1, (n2, t2)::cl2 ->
50 if n1 = n2 && t1 = t2 then
51 NCic.Rel i :: lcp (j-1) (i-1) (cl1,cl2)
53 HExtlib.mk_list (NCic.Appl
54 [NCic.Sort NCic.Prop; NCic.Sort NCic.Prop]) j
56 HExtlib.mk_list (NCic.Appl
57 [NCic.Sort NCic.Prop; NCic.Sort NCic.Prop]) j
61 lcp (List.length destination) (List.length source)
62 (List.rev destination, List.rev source)
64 let lc = (0,NCic.Ctx (List.rev lc)) in
65 let u, d, metasenv, subst, o = status.pstatus in
66 let db = NCicUnifHint.db () in (* XXX fixme *)
67 let (metasenv, subst), t =
69 ~unify:(fun m s c t1 t2 ->
70 try Some (NCicUnification.unify db m s c t1 t2)
72 | NCicUnification.UnificationFailure _
73 | NCicUnification.Uncertain _ -> None)
74 metasenv subst source 0 lc t
76 let status = { status with pstatus = u, d, metasenv, subst, o } in
77 status, (name, destination, t)
80 let term_of_cic_term s t c =
81 let s, (_,_,t) = relocate s c t in
85 type ast_term = string * int * CicNotationPt.term
87 let disambiguate (status : lowtac_status) (t : ast_term)
88 (ty : cic_term option) context =
91 | None -> status, None
93 let status, (_,_,x) = relocate status context ty in status, Some x
95 let uri,height,metasenv,subst,obj = status.pstatus in
96 let metasenv, subst, lexicon_status, t =
97 GrafiteDisambiguate.disambiguate_nterm expty
98 status.lstatus context metasenv subst t
100 let new_pstatus = uri,height,metasenv,subst,obj in
101 { lstatus = lexicon_status; pstatus = new_pstatus }, (None, context, t)
104 let typeof status ctx t =
105 let status, (_,_,t) = relocate status ctx t in
106 let _,_,metasenv,subst,_ = status.pstatus in
107 let ty = NCicTypeChecker.typeof ~subst ~metasenv ctx t in
108 status, (None, ctx, ty)
111 let whd status ?delta ctx t =
112 let status, (name,_,t) = relocate status ctx t in
113 let _,_,_,subst,_ = status.pstatus in
114 let t = NCicReduction.whd ~subst ?delta ctx t in
115 status, (name, ctx, t)
118 let unify status ctx a b =
119 let status, (_,_,a) = relocate status ctx a in
120 let status, (_,_,b) = relocate status ctx b in
121 let n,h,metasenv,subst,o = status.pstatus in
122 let metasenv, subst =
123 NCicUnification.unify (NCicUnifHint.db ()) metasenv subst ctx a b
125 { status with pstatus = n,h,metasenv,subst,o }
128 let refine status ctx term expty =
129 let status, (nt,_,term) = relocate status ctx term in
130 let status, ne, expty =
131 match expty with None -> status, None, None
133 let status, (n,_, e) = relocate status ctx e in status, n, Some e
135 let name,height,metasenv,subst,obj = status.pstatus in
136 let db = NCicUnifHint.db () in (* XXX fixme *)
137 let coercion_db = NCicCoercion.db () in
138 let look_for_coercion = NCicCoercion.look_for_coercion coercion_db in
139 let metasenv, subst, t, ty =
140 NCicRefiner.typeof db ~look_for_coercion metasenv subst ctx term expty
142 { status with pstatus = name,height,metasenv,subst,obj },
143 (nt,ctx,t), (ne,ctx,ty)
146 let get_goalty (status : lowtac_status) (g : int) =
147 let _,_,metasenv,_,_ = status.pstatus in
148 List.assoc g metasenv
151 let instantiate status i t =
152 let (gname, context, _ as gty) = get_goalty status i in
153 let status, (_,_,t), (_,_,ty) =
154 refine status (ctx_of gty) t (Some gty)
157 let name,height,metasenv,subst,obj = status.pstatus in
158 let metasenv = List.filter (fun j,_ -> j <> i) metasenv in
159 let subst = (i, (gname, context, t, ty)) :: subst in
160 { status with pstatus = (name,height,metasenv,subst,obj) }
163 let mk_meta status ?name ctx bo_or_ty =
166 let status, (_,_,ty) = relocate status ctx ty in
167 let n,h,metasenv,subst,o = status.pstatus in
168 let metasenv, _, instance, _ =
169 NCicMetaSubst.mk_meta ?name metasenv ctx (`WithType ty)
171 let status = { status with pstatus = n,h,metasenv,subst,o } in
172 status, (None,ctx,instance)
174 let status, (_,_,bo_ as bo) = relocate status ctx bo in
175 let status, (_,_,ty) = typeof status ctx bo in
176 let n,h,metasenv,subst,o = status.pstatus in
177 let metasenv, metano, instance, _ =
178 NCicMetaSubst.mk_meta ?name metasenv ctx (`WithType ty) in
179 let metasenv = List.filter (fun j,_ -> j <> metano) metasenv in
180 let subst = (metano, (name, ctx, bo_, ty)) :: subst in
181 let status = { status with pstatus = n,h,metasenv,subst,o } in
182 status, (None,ctx,instance)
185 let mk_in_scope status t =
186 mk_meta status ~name:NCicMetaSubst.in_scope_tag (ctx_of t) (`Def t)
189 let mk_out_scope n status t =
190 mk_meta status ~name:(NCicMetaSubst.out_scope_tag n) (ctx_of t) (`Def t)
193 (* the following unification problem will be driven by
194 * select s ~found:mk_in_scope ~postprocess:(mk_out_scope argsno) t pattern
198 * where argsn = length args and the pattern matches t
200 * found is called on every selected term to map them
201 * postprocess is called on the entire term after selection
204 low_status ~found ~postprocess (name,context,term) (wanted,path)
206 let is_found status ctx t wanted =
207 (* we could lift wanted step-by-step *)
208 try true, unify status ctx (None, ctx, t) wanted
210 | NCicUnification.UnificationFailure _
211 | NCicUnification.Uncertain _ -> false, status
213 let match_term status ctx (wanted : cic_term) t =
214 let rec aux ctx status t =
215 let b, status = is_found status ctx t wanted in
217 let status , (_,_,t) = found status (None, ctx, t) in
220 let _,_,_,subst,_ = status.pstatus in
222 | NCic.Meta (i,lc) when List.mem_assoc i subst ->
223 let _,_,t,_ = NCicUtils.lookup_subst i subst in
225 | NCic.Meta _ -> status, t
227 NCicUntrusted.map_term_fold_a (fun e c -> e::c) ctx aux status t
231 let _,_,_,subst,_ = low_status.pstatus in
232 let rec select status ctx pat cic =
234 | _, NCic.Meta (i,lc) when List.mem_assoc i subst ->
236 let _,_,t,_ = NCicUtils.lookup_subst i subst in
237 NCicSubstitution.subst_meta lc t
239 select status ctx pat cic
240 | NCic.LetIn (_,t1,s1,b1), NCic.LetIn (n,t2,s2,b2) ->
241 let status, t = select status ctx t1 t2 in
242 let status, s = select status ctx s1 s2 in
243 let ctx = (n, NCic.Def (s2,t2)) :: ctx in
244 let status, b = select status ctx b1 b2 in
245 status, NCic.LetIn (n,t,s,b)
246 | NCic.Lambda (_,s1,t1), NCic.Lambda (n,s2,t2) ->
247 let status, s = select status ctx s1 s2 in
248 let ctx = (n, NCic.Decl s2) :: ctx in
249 let status, t = select status ctx t1 t2 in
250 status, NCic.Lambda (n,s,t)
251 | NCic.Prod (_,s1,t1), NCic.Prod (n,s2,t2) ->
252 let status, s = select status ctx s1 s2 in
253 let ctx = (n, NCic.Decl s2) :: ctx in
254 let status, t = select status ctx t1 t2 in
255 status, NCic.Prod (n,s,t)
256 | NCic.Appl l1, NCic.Appl l2 ->
259 (fun (status,l) x y ->
260 let status, x = select status ctx x y in
264 status, NCic.Appl (List.rev l)
265 | NCic.Match (_,ot1,t1,pl1), NCic.Match (u,ot2,t2,pl2) ->
266 let status, t = select status ctx t1 t2 in
267 let status, ot = select status ctx ot1 ot2 in
270 (fun (status,l) x y ->
271 let status, x = select status ctx x y in
275 status, NCic.Match (u,ot,t,List.rev pl)
276 | NCic.Implicit `Hole, t ->
279 let status, wanted = disambiguate status wanted None ctx in
280 match_term status ctx wanted t
281 | None -> match_term status ctx (None,ctx,t) t)
282 | NCic.Implicit _, t -> status, t
284 fail (lazy ("malformed pattern: " ^ NCicPp.ppterm ~metasenv:[]
285 ~context:[] ~subst:[] pat ^ " against " ^
286 NCicPp.ppterm ~metasenv:[] ~subst:[] ~context:[] t))
288 let status, term = select low_status context path term in
289 let term = (name, context, term) in
290 postprocess status term
293 let analyse_indty status ty =
294 let status, reduct = whd status (ctx_of ty) ty in
297 | _,_,NCic.Const ref -> ref, []
298 | _,_,NCic.Appl (NCic.Const ref :: args) -> ref, args
299 | _,_,_ -> fail (lazy ("not an inductive type")) in
300 let _,lno,tl,_,i = NCicEnvironment.get_checked_indtys ref in
301 let _,_,_,cl = List.nth tl i in
302 let consno = List.length cl in
303 let left, right = HExtlib.split_nth lno args in
304 status, (ref, consno, left, right)
307 let mk_cic_term c t = None,c,t ;;