--- /dev/null
+(* Copyright (C) 2002, HELM Team.
+ *
+ * This file is part of HELM, an Hypertextual, Electronic
+ * Library of Mathematics, developed at the Computer Science
+ * Department, University of Bologna, Italy.
+ *
+ * HELM is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * HELM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HELM; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ *
+ * For details, see the HELM World-Wide-Web page,
+ * http://cs.unibo.it/helm/.
+ *)
+
+(* $Id$ *)
+
+open ProofEngineTypes
+
+let clearbody ~hyp =
+ let clearbody ~hyp (proof, goal) =
+ let module C = Cic in
+ let curi,metasenv,pbo,pty = proof in
+ let metano,_,_ = CicUtil.lookup_meta goal metasenv in
+ let string_of_name =
+ function
+ C.Name n -> n
+ | C.Anonymous -> "_"
+ in
+ let metasenv' =
+ List.map
+ (function
+ (m,canonical_context,ty) when m = metano ->
+ let canonical_context' =
+ List.fold_right
+ (fun entry context ->
+ match entry with
+ Some (C.Name hyp',C.Def (term,ty)) when hyp = hyp' ->
+ let cleared_entry =
+ let ty =
+ match ty with
+ Some ty -> ty
+ | None ->
+ fst
+ (CicTypeChecker.type_of_aux' metasenv context term
+ CicUniv.empty_ugraph) (* TASSI: FIXME *)
+ in
+ Some (C.Name hyp, Cic.Decl ty)
+ in
+ cleared_entry::context
+ | None -> None::context
+ | Some (n,C.Decl t)
+ | Some (n,C.Def (t,None)) ->
+ let _,_ =
+ try
+ CicTypeChecker.type_of_aux' metasenv context t
+ CicUniv.empty_ugraph (* TASSI: FIXME *)
+ with
+ _ ->
+ raise
+ (Fail
+ (lazy ("The correctness of hypothesis " ^
+ string_of_name n ^
+ " relies on the body of " ^ hyp)
+ ))
+ in
+ entry::context
+ | Some (_,Cic.Def (_,Some _)) -> assert false
+ ) canonical_context []
+ in
+ let _,_ =
+ try
+ CicTypeChecker.type_of_aux' metasenv canonical_context' ty
+ CicUniv.empty_ugraph (* TASSI: FIXME *)
+ with
+ _ ->
+ raise
+ (Fail
+ (lazy ("The correctness of the goal relies on the body of " ^
+ hyp)))
+ in
+ m,canonical_context',ty
+ | t -> t
+ ) metasenv
+ in
+ (curi,metasenv',pbo,pty), [goal]
+ in
+ mk_tactic (clearbody ~hyp)
+
+let clear ~hyp =
+ let clear ~hyp (proof, goal) =
+ let module C = Cic in
+ let curi,metasenv,pbo,pty = proof in
+ let metano,context,ty =
+ CicUtil.lookup_meta goal metasenv
+ in
+ let string_of_name =
+ function
+ C.Name n -> n
+ | C.Anonymous -> "_"
+ in
+ let metasenv' =
+ List.map
+ (function
+ (m,canonical_context,ty) when m = metano ->
+ let context_changed, canonical_context' =
+ List.fold_right
+ (fun entry (b, context) ->
+ match entry with
+ Some (Cic.Name hyp',_) when hyp' = hyp ->
+ (true, None::context)
+ | None -> (b, None::context)
+ | Some (n,C.Decl t)
+ | Some (n,Cic.Def (t,Some _))
+ | Some (n,C.Def (t,None)) ->
+ if b then
+ let _,_ =
+ try
+ CicTypeChecker.type_of_aux' metasenv context t
+ CicUniv.empty_ugraph
+ with _ ->
+ raise
+ (Fail
+ (lazy ("Hypothesis " ^ string_of_name n ^
+ " uses hypothesis " ^ hyp)))
+ in
+ (b, entry::context)
+ else
+ (b, entry::context)
+ ) canonical_context (false, [])
+ in
+ if not context_changed then
+ raise (Fail (lazy ("Hypothesis " ^ hyp ^ " does not exist")));
+ let _,_ =
+ try
+ CicTypeChecker.type_of_aux' metasenv canonical_context' ty
+ CicUniv.empty_ugraph
+ with _ ->
+ raise (Fail (lazy ("Hypothesis " ^ hyp ^ " occurs in the goal")))
+ in
+ m,canonical_context',ty
+ | t -> t
+ ) metasenv
+ in
+ (curi,metasenv',pbo,pty), [goal]
+ in
+ mk_tactic (clear ~hyp)
+
+(* Warning: this tactic has no effect on the proof term.
+ It just changes the name of an hypothesis in the current sequent *)
+let rename ~from ~to_ =
+ let rename ~from ~to_ (proof, goal) =
+ let module C = Cic in
+ let curi,metasenv,pbo,pty = proof in
+ let metano,context,ty =
+ CicUtil.lookup_meta goal metasenv
+ in
+ let metasenv' =
+ List.map
+ (function
+ (m,canonical_context,ty) when m = metano ->
+ let canonical_context' =
+ List.map
+ (function
+ Some (Cic.Name hyp,decl_or_def) when hyp = from ->
+ Some (Cic.Name to_,decl_or_def)
+ | item -> item
+ ) canonical_context
+ in
+ m,canonical_context',ty
+ | t -> t
+ ) metasenv
+ in
+ (curi,metasenv',pbo,pty), [goal]
+ in
+ mk_tactic (rename ~from ~to_)
+
+let set_goal n =
+ ProofEngineTypes.mk_tactic
+ (fun (proof, goal) ->
+ let (_, metasenv, _, _) = proof in
+ if CicUtil.exists_meta n metasenv then
+ (proof, [n])
+ else
+ raise (ProofEngineTypes.Fail (lazy ("no such meta: " ^ string_of_int n))))
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