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: nCicRefiner.mli 9227 2008-11-21 16:00:06Z tassi $ *)
14 let debug s = prerr_endline (Lazy.force s);;
17 module COT : Set.OrderedType
18 with type t = string * NCic.term * int * int * NCic.term *
21 type t = string * NCic.term * int * int * NCic.term * NCic.term
22 let compare = Pervasives.compare
25 module CoercionSet = Set.Make(COT)
28 Discrimination_tree.Make(NDiscriminationTree.NCicIndexable)(CoercionSet)
32 let empty_db = DB.empty,DB.empty
36 inherit NCicUnifHint.status
39 method set_coerc_db v = {< db = v >}
40 method set_coercion_status
41 : 'status. < coerc_db : db; uhint_db: NCicUnifHint.db; .. > as 'status ->
43 = fun o -> {< db = o#coerc_db >}#set_unifhint_status o
46 let index_coercion status name c src tgt arity arg =
47 let db_src,db_tgt = status#coerc_db in
48 let data = (name,c,arity,arg,src,tgt) in
50 debug (lazy ("INDEX:" ^
51 NCicPp.ppterm ~metasenv:[] ~subst:[] ~context:[] src ^ " ===> " ^
52 NCicPp.ppterm ~metasenv:[] ~subst:[] ~context:[] tgt ^ " := " ^
53 NCicPp.ppterm ~metasenv:[] ~subst:[] ~context:[] c ^ " " ^
54 string_of_int arg ^ " " ^ string_of_int arity));
56 let db_src = DB.index db_src src data in
57 let db_tgt = DB.index db_tgt tgt data in
58 status#set_coerc_db (db_src, db_tgt)
61 let index_old_db odb (status : #status) =
63 (fun status (_,tgt,clist) ->
65 (fun status (uri,_,arg) ->
67 let c=fst (OCic2NCic.convert_term uri (CicUtil.term_of_uri uri)) in
68 let arity = match tgt with | CoercDb.Fun i -> i | _ -> 0 in
70 let cty = NCicTypeChecker.typeof ~subst:[] ~metasenv:[] [] c in
71 let scty, metasenv,_ =
72 NCicMetaSubst.saturate ~delta:max_int [] [] [] cty (arity+1)
75 | NCic.Prod (_, src, tgt) ->
77 NCicSubstitution.subst (NCic.Meta (-1,(0,NCic.Irl 0))) tgt
80 debug (lazy (Printf.sprintf "indicizzo %s (%d)) : %s ===> %s"
81 (NCicPp.ppterm ~metasenv ~subst:[] ~context:[] scty) (arity+1)
82 (NCicPp.ppterm ~metasenv ~subst:[] ~context:[] src)
83 (NCicPp.ppterm ~metasenv ~subst:[] ~context:[] tgt));
88 NCicPp.ppterm ~metasenv ~subst:[] ~context:[] t));
91 index_coercion status "foo" c src tgt arity arg
93 | NCicEnvironment.BadDependency _
94 | NCicTypeChecker.TypeCheckerFailure _ -> status)
96 status (CoercDb.to_list odb)
99 let look_for_coercion status metasenv subst context infty expty =
100 let db_src,db_tgt = status#coerc_db in
102 NCicUntrusted.apply_subst subst context infty,
103 NCicUntrusted.apply_subst subst context expty
105 | (NCic.Meta _ | NCic.Appl (NCic.Meta _::_)),
106 (NCic.Meta _ | NCic.Appl (NCic.Meta _::_)) -> []
109 debug (lazy ("LOOK FOR COERCIONS: " ^
110 NCicPp.ppterm ~metasenv ~subst ~context infty ^ " |===> " ^
111 NCicPp.ppterm ~metasenv ~subst ~context expty));
113 let src_class = infty :: NCicUnifHint.eq_class_of status infty in
114 let tgt_class = expty :: NCicUnifHint.eq_class_of status expty in
119 CoercionSet.union (DB.retrieve_unifiables db_src infty) set)
120 CoercionSet.empty src_class
125 CoercionSet.union (DB.retrieve_unifiables db_tgt expty) set)
126 CoercionSet.empty tgt_class
129 debug (lazy ("CANDIDATES SRC: " ^
130 String.concat "," (List.map (fun (name,t,_,_,_,_) ->
131 name ^ " :: " ^ NCicPp.ppterm ~metasenv ~subst ~context t)
132 (CoercionSet.elements set_src))));
133 debug (lazy ("CANDIDATES TGT: " ^
134 String.concat "," (List.map (fun (name,t,_,_,_,_) ->
135 name ^ " :: " ^ NCicPp.ppterm ~metasenv ~subst ~context t)
136 (CoercionSet.elements set_tgt))));
138 let candidates = CoercionSet.inter set_src set_tgt in
140 debug (lazy ("CANDIDATES: " ^
141 String.concat "," (List.map (fun (name,t,_,_,_,_) ->
142 name ^ " :: " ^ NCicPp.ppterm ~metasenv ~subst ~context t)
143 (CoercionSet.elements candidates))));
146 (fun (name,t,arity,arg,_,_) ->
148 try NCicTypeChecker.typeof ~metasenv:[] ~subst:[] [] t
149 with NCicTypeChecker.TypeCheckerFailure s ->
150 prerr_endline ("illtyped coercion: "^Lazy.force s);
151 prerr_endline (NCicPp.ppterm ~metasenv:[] ~subst:[] ~context:[] t);
154 let ty, metasenv, args =
155 NCicMetaSubst.saturate ~delta:max_int metasenv subst context ty arity
159 NCicPp.ppterm ~metasenv ~subst:[] ~context:[] ty ^ " --- " ^
160 NCicPp.ppterm ~metasenv ~subst ~context
161 (NCicUntrusted.mk_appl t args) ^ " --- " ^
162 string_of_int (List.length args) ^ " == " ^ string_of_int arg));
164 name,metasenv, NCicUntrusted.mk_appl t args, ty, List.nth args arg)
165 (CoercionSet.elements candidates)
168 (* CSC: very inefficient implementation!
169 Enrico, can we use a discrimination tree here? *)
170 let match_coercion status ~metasenv ~subst ~context t =
172 DB.fold (fst (status#coerc_db)) (fun _ v l -> (CoercionSet.elements v)@l) []
174 (HExtlib.list_findopt
175 (fun (_,p,arity,cpos,_,_) _ ->
179 NCic.Appl lp, NCic.Appl lt ->
180 (match fst (HExtlib.split_nth (List.length lp) lt) with
183 | _,NCic.Appl (he::_) -> he
186 let b = NCicReduction.alpha_eq metasenv subst context p t in
187 if not b then None else
188 let ty = NCicTypeChecker.typeof ~metasenv:[] ~subst:[] [] p in
190 let rec aux = function NCic.Prod (_,_,t) -> 1+aux t | _ -> 0 in
193 Some (p,pis - arity - cpos - 1,cpos)
195 Failure _ -> None (* raised by split_nth *)
199 let generate_dot_file status fmt =
200 let module Pp = GraphvizPp.Dot in
201 let src_db, _ = status#coerc_db in
202 let edges = ref [] in
203 DB.iter src_db (fun _ dataset ->
206 (fun (name,t,a,g,sk,dk) ->
207 debug(lazy (let p = NCicPp.ppterm ~metasenv:[] ~context:[]
208 ~subst:[] in p t ^ " ::: " ^ p sk ^ " |--> " ^ p dk));
209 let eq_s= sk::NCicUnifHint.eq_class_of status sk in
210 let eq_t= dk::NCicUnifHint.eq_class_of status dk in
211 (name,t,a,g),eq_s,eq_t
213 (CoercionSet.elements dataset);
225 let names = ref [] in
228 try List.assoc l !names
231 names := (l,"node"^string_of_int!id) :: !names;
237 ~attrs:["label",String.concat "\\n"
239 NCicPp.ppterm ~metasenv:[] ~subst:[]
240 ~context:[] t ~margin:max_int
245 (fun ((name,_,_,_),src,tgt) ->
246 Pp.edge (mangle src) (mangle tgt)
247 ~attrs:["label", name] fmt)