-(*
-let reduction_tac ~reduction (proof,goal) =
- let curi,metasenv,pbo,pty = proof in
- let metano,context,ty = CicUtil.lookup_meta goal metasenv in
- let new_ty = reduction context ty in
- let new_metasenv =
- List.map
- (function
- (n,_,_) when n = metano -> (metano,context,new_ty)
+open ProofEngineTypes
+
+(* Note: this code is almost identical to PrimitiveTactics.change_tac and
+* it could be unified by making the change function a callback *)
+let reduction_tac ~reduction ~pattern
+ (proof,goal)
+=
+ let curi,metasenv,pbo,pty = proof in
+ let (metano,context,ty) as conjecture = CicUtil.lookup_meta goal metasenv in
+ let change where terms =
+ if terms = [] then where
+ else
+ let terms, terms' =
+ List.split (List.map (fun (context, t) -> t, reduction context t) terms)
+ in
+ ProofEngineReduction.replace ~equality:(==) ~what:terms ~with_what:terms'
+ ~where:where in
+ let (selected_context,selected_ty) =
+ ProofEngineHelpers.select ~metasenv ~conjecture ~pattern in
+ let ty' = change ty selected_ty in
+ let context' =
+ List.fold_right2
+ (fun entry selected_entry context' ->
+ match entry,selected_entry with
+ None,None -> None::context'
+ | Some (name,Cic.Decl ty),Some (`Decl selected_ty) ->
+ let ty' = change ty selected_ty in
+ Some (name,Cic.Decl ty')::context'
+ | Some (name,Cic.Def (bo,ty)),Some (`Def (selected_bo,selected_ty)) ->
+ let bo' = change bo selected_bo in
+ let ty' =
+ match ty,selected_ty with
+ None,None -> None
+ | Some ty,Some selected_ty -> Some (change ty selected_ty)
+ | _,_ -> assert false
+ in
+ Some (name,Cic.Def (bo',ty'))::context'
+ | _,_ -> assert false
+ ) context selected_context [] in
+ let metasenv' =
+ List.map (function
+ | (n,_,_) when n = metano -> (metano,context',ty')