* http://cs.unibo.it/helm/.
*)
-(*
+
module PEH = ProofEngineHelpers
-*)
module U = CicUniv
module TC = CicTypeChecker
module PET = ProofEngineTypes
module PESR = ProofEngineStructuralRules
let fail_msg0 = "unexported clearbody: invalid argument"
-let fail_msg1 = "fwd: argument is not premise in the current goal"
let fail_msg2 = "fwd: no applicable simplification"
let error msg = raise (PET.Fail msg)
(* unexported tactics *******************************************************)
+let id_tac =
+ let id_tac (proof,goal) =
+ try
+ let _, metasenv, _, _ = proof in
+ let _, _, _ = CicUtil.lookup_meta goal metasenv in
+ (proof,[goal])
+ with CicUtil.Meta_not_found _ -> (proof, [])
+ in
+ PET.mk_tactic id_tac
+
let clearbody ~index =
let rec find_name index = function
| Some (Cic.Name name, _) :: _ when index = 1 -> name
metasenv, Cic.Meta (index, irl), index
in
let update_counters = function
- | None, [] -> None, T.id_tac, []
- | None, to_what :: tail -> None, PT.apply_tac ~term:to_what, tail
- | Some hm, [] -> Some (pred hm), T.id_tac, []
- | Some hm, to_what :: tail -> Some (pred hm), PT.apply_tac ~term:to_what, tail
+ | None, [] -> None, false, id_tac, []
+ | None, to_what :: tail -> None, true, PT.apply_tac ~term:to_what, tail
+ | Some hm, [] -> Some (pred hm), false, id_tac, []
+ | Some hm, to_what :: tail -> Some (pred hm), true, PT.apply_tac ~term:to_what, tail
in
let rec aux metasenv metas conts tw = function
| Some hm, _ when hm <= 0 -> metasenv, metas, conts
| xhm, Cic.Prod (Cic.Name _, t1, t2) ->
let metasenv, meta, index = mk_meta metasenv t1 in
- aux metasenv (meta :: metas) ((T.id_tac, index) :: conts) tw (xhm, (S.subst meta t2))
+ aux metasenv (meta :: metas) (conts @ [id_tac, index]) tw (xhm, (S.subst meta t2))
| xhm, Cic.Prod (Cic.Anonymous, t1, t2) ->
- let xhm, tac, tw = update_counters (xhm, tw) in
+ let xhm, pos, tac, tw = update_counters (xhm, tw) in
let metasenv, meta, index = mk_meta metasenv t1 in
- aux metasenv (meta :: metas) ((tac, index) :: conts) tw (xhm, (S.subst meta t2))
+ let conts = if pos then (tac, index) :: conts else conts @ [tac, index] in
+ aux metasenv (meta :: metas) conts tw (xhm, (S.subst meta t2))
| _, t -> metasenv, metas, conts
in
aux metasenv [] [] to_what (how_many, term)
let lemma, _ = TC.type_of_aux' metasenv context what U.empty_ugraph in
let lemma = FNG.clean_dummy_dependent_types lemma in
let metasenv, metas, conts = strip_prods metasenv context ?how_many to_what lemma in
- let conclusion = Cic.Appl (what :: List.rev metas) in
+ let conclusion =
+ match metas with [] -> what | _ -> Cic.Appl (what :: List.rev metas)
+ in
let tac = T.thens ~start:(letin_tac conclusion)
~continuations:[clearbody ~index:1]
in
(* fwd **********************************************************************)
-let fwd_simpl_tac ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~subst:[])
- ~hyp ~dbd =
- let find_type metasenv context =
- let rec aux p = function
- | Some (Cic.Name name, Cic.Decl t) :: _ when name = hyp -> p, t
- | Some (Cic.Name name, Cic.Def (_, Some t)) :: _ when name = hyp -> p, t
- | Some (Cic.Name name, Cic.Def (u, _)) :: tail when name = hyp ->
- p, fst (TC.type_of_aux' metasenv tail u U.empty_ugraph)
- | _ :: tail -> aux (succ p) tail
- | [] -> error fail_msg1
- in
- aux 1 context
- in
+let fwd_simpl_tac
+ ?(mk_fresh_name_callback = FNG.mk_fresh_name ~subst:[])
+ ~dbd hyp =
let lapply_tac to_what lemma =
lapply_tac ~mk_fresh_name_callback ~how_many:1 ~to_what:[to_what] lemma
in
let (proof, goal) = status in
let _, metasenv, _, _ = proof in
let _, context, ty = CicUtil.lookup_meta goal metasenv in
- let index, major = find_type metasenv context in
+ let index, major = PEH.lookup_type metasenv context hyp in
match MetadataQuery.fwd_simpl ~dbd major with
| [] -> error fail_msg2
| uri :: _ ->
Printf.eprintf "fwd: %s\n" (UriManager.string_of_uri uri); flush stderr;
let start = lapply_tac (Cic.Rel index) (Cic.Const (uri, [])) in
- let tac = T.thens ~start ~continuations:[PESR.clearbody hyp] in
+ let tac = T.thens ~start ~continuations:[PESR.clear hyp] in
PET.apply_tactic tac status
in
PET.mk_tactic fwd_simpl_tac