X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Focaml%2Ftactics%2FfwdSimplTactic.ml;h=a5c7878c7341336a822e39587adcaa5947b9d018;hb=4167cea65ca58897d1a3dbb81ff95de5074700cc;hp=c1a5347f42d034a157a7e7aec3852b631a0a031f;hpb=0aa359c7943ea10c70ae1ec053062c658b28b8ce;p=helm.git diff --git a/helm/ocaml/tactics/fwdSimplTactic.ml b/helm/ocaml/tactics/fwdSimplTactic.ml index c1a5347f4..a5c7878c7 100644 --- a/helm/ocaml/tactics/fwdSimplTactic.ml +++ b/helm/ocaml/tactics/fwdSimplTactic.ml @@ -23,65 +23,121 @@ * http://cs.unibo.it/helm/. *) -module MI = CicMkImplicit + +module PEH = ProofEngineHelpers +module U = CicUniv module TC = CicTypeChecker module PET = ProofEngineTypes -module U = CicUniv module S = CicSubstitution module PT = PrimitiveTactics +module T = Tacticals +module FNG = FreshNamesGenerator +module MI = CicMkImplicit +module PESR = ProofEngineStructuralRules + +let fail_msg0 = "unexported clearbody: invalid argument" +let fail_msg2 = "fwd: no applicable simplification" -(* -let module R = CicReduction -*) +let error msg = raise (PET.Fail (lazy msg)) -let fail_msg0 = "not a declaration of the current context" -let fail_msg1 = "no applicable simplification" +(* unexported tactics *******************************************************) -let error msg = raise (PET.Fail msg) +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 rec declaration name = function - | [] -> error fail_msg0 - | Some (hyp, Cic.Decl ty) :: _ when hyp = name -> ty - | _ :: tail -> declaration name tail +let clearbody ~index = + let rec find_name index = function + | Some (Cic.Name name, _) :: _ when index = 1 -> name + | _ :: tail when index > 1 -> find_name (pred index) tail + | _ -> error fail_msg0 + in + let clearbody status = + let (proof, goal) = status in + let _, metasenv, _, _ = proof in + let _, context, _ = CicUtil.lookup_meta goal metasenv in + PET.apply_tactic (PESR.clearbody ~hyp:(find_name index context)) status + in + PET.mk_tactic clearbody (* lapply *******************************************************************) -let lapply_tac ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~subst:[]) - ?(substs = []) what = - let rec strip_dependent_prods metasenv context ss = function - | Cic.Prod (name, t1, t2) as t -> - if TC.does_not_occur context 0 1 t2 then metasenv, ss, t else - let metasenv, index = MI.mk_implicit metasenv [] context in - let rs = MI.identity_relocation_list_for_metavariable context in - let e, s = Some (name, Cic.Decl t1), Some (Cic.Meta (index, rs)) in - strip_dependent_prods metasenv (e :: context) (s :: ss) t2 - | t -> metasenv, ss, t +let strip_prods metasenv context ?how_many to_what term = + let irl = MI.identity_relocation_list_for_metavariable context in + let mk_meta metasenv its_type = + let index = MI.new_meta metasenv [] in + let metasenv = [index, context, its_type] @ metasenv in + metasenv, Cic.Meta (index, irl), index in - let update_metasenv metasenv ((xuri, _, u,t), goal) = - ((xuri, metasenv, u,t), goal) + let update_counters = function + | 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) (conts @ [id_tac, index]) tw (xhm, (S.subst meta t2)) + | xhm, Cic.Prod (Cic.Anonymous, t1, t2) -> + let xhm, pos, tac, tw = update_counters (xhm, tw) in + let metasenv, meta, index = mk_meta metasenv t1 in + 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 - let lapply_tac status = - let (proof, goal) = status in - let _,metasenv,_,_ = proof in - let _,context,ty = CicUtil.lookup_meta goal metasenv in + aux metasenv [] [] to_what (how_many, term) + +let lapply_tac ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~subst:[]) + (* ?(substs = []) *) ?how_many ?(to_what = []) what = + let letin_tac term = PT.letin_tac ~mk_fresh_name_callback term in + let lapply_tac (proof, goal) = + let xuri, metasenv, u, t = proof in + let _, context, _ = CicUtil.lookup_meta goal metasenv in let lemma, _ = TC.type_of_aux' metasenv context what U.empty_ugraph in - let metasenv, substs, stripped_lemma = strip_dependent_prods metasenv context [] lemma in - let status = update_metasenv metasenv status in - let holed_lemma = S.subst_meta substs stripped_lemma in - PET.apply_tactic (PT.cut_tac ~mk_fresh_name_callback holed_lemma) status + 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 = + match metas with [] -> what | _ -> Cic.Appl (what :: List.rev metas) + in + let tac = T.then_ ~start:(letin_tac conclusion) + ~continuation:(clearbody ~index:1) + in + let proof = (xuri, metasenv, u, t) in + let aux (proof, goals) (tac, goal) = + let proof, new_goals = PET.apply_tactic tac (proof, goal) in + proof, goals @ new_goals + in + List.fold_left aux (proof, []) ((tac, goal) :: conts) in PET.mk_tactic lapply_tac - + (* fwd **********************************************************************) -let fwd_simpl_tac ~hyp ~dbd = +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 fwd_simpl_tac status = let (proof, goal) = status in - let _,metasenv,_,_ = proof in - let _,context,ty = CicUtil.lookup_meta goal metasenv in - let major = declaration hyp context in - match MetadataQuery.fwd_simpl ~dbd major with - | [] -> error fail_msg1 - | uri :: _ -> prerr_endline uri; (proof, []) + let _, metasenv, _, _ = proof in + let _, context, ty = CicUtil.lookup_meta goal metasenv 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.then_ ~start ~continuation:(PESR.clear hyp) in + PET.apply_tactic tac status in PET.mk_tactic fwd_simpl_tac