1 (* Copyright (C) 2004-2005, HELM Team.
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4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
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15 * GNU General Public License for more details.
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29 (* XXX ZACK: switched to CicNotationUtil.names_of_term, commented code below to
30 * be removes as soon as we believe implementation are equivalent *)
31 (* let meta_names_of term =
32 let rec names = ref [] in
34 if List.mem n !names then ()
35 else names := n :: !names
37 let rec aux = function
38 | AttributedTerm (_, term) -> aux term
39 | Appl terms -> List.iter aux terms
40 | Binder (_, _, body) -> aux body
41 | Case (term, indty, outty_opt, patterns) ->
44 List.iter aux_branch patterns
45 | LetIn (_, t1, t2) ->
48 | LetRec (_, definitions, body) ->
49 List.iter aux_definition definitions ;
51 | Uri (_, Some substs) -> aux_substs substs
52 | Ident (_, Some substs) -> aux_substs substs
53 | Meta (_, substs) -> aux_meta_substs substs
63 | Magic magic -> aux_magic magic
64 | Variable var -> aux_variable var
67 and aux_opt = function
68 | Some term -> aux term
70 and aux_capture_var (_, ty_opt) = aux_opt ty_opt
71 and aux_branch (pattern, term) =
74 and aux_pattern (head, vars) =
75 List.iter aux_capture_var vars
76 and aux_definition (var, term, i) =
79 and aux_substs substs = List.iter (fun (_, term) -> aux term) substs
80 and aux_meta_substs meta_substs = List.iter aux_opt meta_substs
81 and aux_variable = function
82 | NumVar name -> add_name name
83 | IdentVar name -> add_name name
84 | TermVar name -> add_name name
86 | Ascription _ -> assert false
87 and aux_magic = function
89 | Fold (_, t1, _, t2) ->
97 let unopt_names names env =
98 let rec aux acc = function
99 | (name, (ty, v)) :: tl when List.mem name names ->
101 | OptType ty, OptValue (Some v) -> aux ((name, (ty, v)) :: acc) tl
103 | _ :: tl -> aux acc tl
104 (* some pattern may contain only meta names, thus we trash all others *)
109 let head_names names env =
110 let rec aux acc = function
111 | (name, (ty, v)) :: tl when List.mem name names ->
113 | ListType ty, ListValue (v :: _) -> aux ((name, (ty, v)) :: acc) tl
115 | _ :: tl -> aux acc tl
116 (* base pattern may contain only meta names, thus we trash all others *)
121 let tail_names names env =
122 let rec aux acc = function
123 | (name, (ty, v)) :: tl when List.mem name names ->
125 | ListType ty, ListValue (_ :: vtl) ->
126 aux ((name, (ListType ty, ListValue vtl)) :: acc) tl
128 | binding :: tl -> aux (binding :: acc) tl
133 let instantiate_level2 env term =
134 let fresh_env = ref [] in
135 let lookup_fresh_name n =
137 List.assoc n !fresh_env
139 let new_name = CicNotationUtil.fresh_name () in
140 fresh_env := (n, new_name) :: !fresh_env;
143 let rec aux env term =
145 | AttributedTerm (_, term) -> aux env term
146 | Appl terms -> Appl (List.map (aux env) terms)
147 | Binder (binder, var, body) ->
148 Binder (binder, aux_capture_var env var, aux env body)
149 | Case (term, indty, outty_opt, patterns) ->
150 Case (aux env term, indty, aux_opt env outty_opt,
151 List.map (aux_branch env) patterns)
152 | LetIn (var, t1, t2) ->
153 LetIn (aux_capture_var env var, aux env t1, aux env t2)
154 | LetRec (kind, definitions, body) ->
155 LetRec (kind, List.map (aux_definition env) definitions, aux env body)
156 | Uri (name, None) -> Uri (name, None)
157 | Uri (name, Some substs) -> Uri (name, Some (aux_substs env substs))
158 | Ident (name, Some substs) -> Ident (name, Some (aux_substs env substs))
159 | Meta (index, substs) -> Meta (index, aux_meta_substs env substs)
168 | Magic magic -> aux_magic env magic
169 | Variable var -> aux_variable env var
172 and aux_opt env = function
173 | Some term -> Some (aux env term)
175 and aux_capture_var env (name, ty_opt) = (aux env name, aux_opt env ty_opt)
176 and aux_branch env (pattern, term) =
177 (aux_pattern env pattern, aux env term)
178 and aux_pattern env (head, vars) =
179 (head, List.map (aux_capture_var env) vars)
180 and aux_definition env (var, term, i) =
181 (aux_capture_var env var, aux env term, i)
182 and aux_substs env substs =
183 List.map (fun (name, term) -> (name, aux env term)) substs
184 and aux_meta_substs env meta_substs = List.map (aux_opt env) meta_substs
185 and aux_variable env = function
186 | NumVar name -> Num (lookup_num env name, 0)
187 | IdentVar name -> Ident (lookup_string env name, None)
188 | TermVar name -> lookup_term env name
189 | FreshVar name -> Ident (lookup_fresh_name name, None)
190 | Ascription (term, name) -> assert false
191 and aux_magic env = function
192 | Default (some_pattern, none_pattern) ->
193 (match CicNotationUtil.names_of_term some_pattern with
194 | [] -> assert false (* some pattern must contain at least 1 name *)
195 | (name :: _) as names ->
196 (match lookup_value env name with
197 | OptValue (Some _) ->
198 (* assumption: if "name" above is bound to Some _, then all
199 * names returned by "meta_names_of" are bound to Some _ as well
201 aux (unopt_names names env) some_pattern
202 | OptValue None -> aux env none_pattern
203 | _ -> assert false))
204 | Fold (`Left, base_pattern, names, rec_pattern) ->
205 let acc_name = List.hd names in (* names can't be empty, cfr. parser *)
207 List.filter ((<>) acc_name)
208 (CicNotationUtil.names_of_term rec_pattern)
210 (match meta_names with
211 | [] -> assert false (* as above *)
212 | (name :: _) as names ->
213 let rec instantiate_fold_left acc env' =
214 prerr_endline "instantiate_fold_left";
215 match lookup_value env' name with
216 | ListValue (_ :: _) ->
217 instantiate_fold_left
218 (let acc_binding = acc_name, (TermType, TermValue acc) in
219 aux (acc_binding :: head_names names env') rec_pattern)
220 (tail_names names env')
221 | ListValue [] -> acc
224 instantiate_fold_left (aux env base_pattern) env)
225 | Fold (`Right, base_pattern, names, rec_pattern) ->
226 let acc_name = List.hd names in (* names can't be empty, cfr. parser *)
228 List.filter ((<>) acc_name)
229 (CicNotationUtil.names_of_term rec_pattern)
231 (match meta_names with
232 | [] -> assert false (* as above *)
233 | (name :: _) as names ->
234 let rec instantiate_fold_right env' =
235 prerr_endline "instantiate_fold_right";
236 match lookup_value env' name with
237 | ListValue (_ :: _) ->
238 let acc = instantiate_fold_right (tail_names names env') in
239 let acc_binding = acc_name, (TermType, TermValue acc) in
240 aux (acc_binding :: head_names names env') rec_pattern
241 | ListValue [] -> aux env base_pattern
244 instantiate_fold_right env)