1 (* Copyright (C) 2004-2005, 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://helm.cs.unibo.it/
29 let meta_names_of term =
30 let rec names = ref [] in
32 if List.mem n !names then ()
33 else names := n :: !names
35 let rec aux = function
36 | AttributedTerm (_, term) -> aux term
37 | Appl terms -> List.iter aux terms
38 | Binder (_, _, body) -> aux body
39 | Case (term, indty, outty_opt, patterns) ->
42 List.iter aux_branch patterns
43 | LetIn (_, t1, t2) ->
46 | LetRec (_, definitions, body) ->
47 List.iter aux_definition definitions ;
49 | Uri (_, Some substs) -> aux_substs substs
50 | Ident (_, Some substs) -> aux_substs substs
51 | Meta (_, substs) -> aux_meta_substs substs
61 | Magic magic -> aux_magic magic
62 | Variable var -> aux_variable var
65 and aux_opt = function
66 | Some term -> aux term
68 and aux_capture_var (_, ty_opt) = aux_opt ty_opt
69 and aux_branch (pattern, term) =
72 and aux_pattern (head, vars) =
73 List.iter aux_capture_var vars
74 and aux_definition (var, term, i) =
77 and aux_substs substs = List.iter (fun (_, term) -> aux term) substs
78 and aux_meta_substs meta_substs = List.iter aux_opt meta_substs
79 and aux_variable = function
80 | NumVar name -> add_name name
81 | IdentVar name -> add_name name
82 | TermVar name -> add_name name
84 | Ascription _ -> assert false
85 and aux_magic = function
87 | Fold (_, t1, _, t2) ->
95 let unopt_names names env =
96 let rec aux acc = function
97 | (name, (ty, v)) :: tl when List.mem name names ->
99 | OptType ty, OptValue (Some v) -> aux ((name, (ty, v)) :: acc) tl
101 | _ :: tl -> aux acc tl
102 (* some pattern may contain only meta names, thus we trash all others *)
107 let head_names names env =
108 let rec aux acc = function
109 | (name, (ty, v)) :: tl when List.mem name names ->
111 | ListType ty, ListValue (v :: _) -> aux ((name, (ty, v)) :: acc) tl
113 | _ :: tl -> aux acc tl
114 (* base pattern may contain only meta names, thus we trash all others *)
119 let tail_names names env =
120 let rec aux acc = function
121 | (name, (ty, v)) :: tl when List.mem name names ->
123 | ListType ty, ListValue (_ :: vtl) ->
124 aux ((name, (ListType ty, ListValue vtl)) :: acc) tl
126 | binding :: tl -> aux (binding :: acc) tl
131 let instantiate_level2 env term =
132 let fresh_env = ref [] in
133 let lookup_fresh_name n =
135 List.assoc n !fresh_env
137 let new_name = CicNotationUtil.fresh_name () in
138 fresh_env := (n, new_name) :: !fresh_env;
141 let rec aux env term =
143 | AttributedTerm (_, term) -> aux env term
144 | Appl terms -> Appl (List.map (aux env) terms)
145 | Binder (binder, var, body) ->
146 Binder (binder, aux_capture_var env var, aux env body)
147 | Case (term, indty, outty_opt, patterns) ->
148 Case (aux env term, indty, aux_opt env outty_opt,
149 List.map (aux_branch env) patterns)
150 | LetIn (var, t1, t2) ->
151 LetIn (aux_capture_var env var, aux env t1, aux env t2)
152 | LetRec (kind, definitions, body) ->
153 LetRec (kind, List.map (aux_definition env) definitions, aux env body)
154 | Uri (name, None) -> Uri (name, None)
155 | Uri (name, Some substs) -> Uri (name, Some (aux_substs env substs))
156 | Ident (name, Some substs) -> Ident (name, Some (aux_substs env substs))
157 | Meta (index, substs) -> Meta (index, aux_meta_substs env substs)
166 | Magic magic -> aux_magic env magic
167 | Variable var -> aux_variable env var
170 and aux_opt env = function
171 | Some term -> Some (aux env term)
173 and aux_capture_var env (name, ty_opt) = (aux env name, aux_opt env ty_opt)
174 and aux_branch env (pattern, term) =
175 (aux_pattern env pattern, aux env term)
176 and aux_pattern env (head, vars) =
177 (head, List.map (aux_capture_var env) vars)
178 and aux_definition env (var, term, i) =
179 (aux_capture_var env var, aux env term, i)
180 and aux_substs env substs =
181 List.map (fun (name, term) -> (name, aux env term)) substs
182 and aux_meta_substs env meta_substs = List.map (aux_opt env) meta_substs
183 and aux_variable env = function
184 | NumVar name -> Num (lookup_num env name, 0)
185 | IdentVar name -> Ident (lookup_string env name, None)
186 | TermVar name -> lookup_term env name
187 | FreshVar name -> Ident (lookup_fresh_name name, None)
188 | Ascription (term, name) -> assert false
189 and aux_magic env = function
190 | Default (some_pattern, none_pattern) ->
191 (match meta_names_of some_pattern with
192 | [] -> assert false (* some pattern must contain at least 1 name *)
193 | (name :: _) as names ->
194 (match lookup_value env name with
195 | OptValue (Some _) ->
196 (* assumption: if "name" above is bound to Some _, then all
197 * names returned by "meta_names_of" are bound to Some _ as well
199 aux (unopt_names names env) some_pattern
200 | OptValue None -> aux env none_pattern
201 | _ -> assert false))
202 | Fold (`Left, base_pattern, names, rec_pattern) ->
203 let acc_name = List.hd names in (* names can't be empty, cfr. parser *)
205 List.filter ((<>) acc_name) (meta_names_of rec_pattern)
207 (match meta_names with
208 | [] -> assert false (* as above *)
209 | (name :: _) as names ->
210 let rec instantiate_fold_left acc env' =
211 prerr_endline "instantiate_fold_left";
212 match lookup_value env' name with
213 | ListValue (_ :: _) ->
214 instantiate_fold_left
215 (let acc_binding = acc_name, (TermType, TermValue acc) in
216 aux (acc_binding :: head_names names env') rec_pattern)
217 (tail_names names env')
218 | ListValue [] -> acc
221 instantiate_fold_left (aux env base_pattern) env)
222 | Fold (`Right, base_pattern, names, rec_pattern) ->
223 let acc_name = List.hd names in (* names can't be empty, cfr. parser *)
225 List.filter ((<>) acc_name) (meta_names_of rec_pattern)
227 (match meta_names with
228 | [] -> assert false (* as above *)
229 | (name :: _) as names ->
230 let rec instantiate_fold_right env' =
231 prerr_endline "instantiate_fold_right";
232 match lookup_value env' name with
233 | ListValue (_ :: _) ->
234 let acc = instantiate_fold_right (tail_names names env') in
235 let acc_binding = acc_name, (TermType, TermValue acc) in
236 aux (acc_binding :: head_names names env') rec_pattern
237 | ListValue [] -> aux env base_pattern
240 instantiate_fold_right env)