src/HOL/Tools/Sledgehammer/metis_tactics.ML
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(*  Title:      HOL/Tools/Sledgehammer/metis_tactics.ML
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    Author:     Kong W. Susanto and Lawrence C. Paulson, CU Computer Laboratory
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    Copyright   Cambridge University 2007
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HOL setup for the Metis prover.
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*)
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signature METIS_TACTICS =
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sig
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  val trace: bool Unsynchronized.ref
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  val type_lits: bool Config.T
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  val metis_tac: Proof.context -> thm list -> int -> tactic
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  val metisF_tac: Proof.context -> thm list -> int -> tactic
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  val metisFT_tac: Proof.context -> thm list -> int -> tactic
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  val setup: theory -> theory
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end
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structure Metis_Tactics : METIS_TACTICS =
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struct
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open Sledgehammer_Util
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open Sledgehammer_FOL_Clause
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open Sledgehammer_Fact_Preprocessor
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open Sledgehammer_HOL_Clause
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open Sledgehammer_Proof_Reconstruct
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open Sledgehammer_Fact_Filter
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val trace = Unsynchronized.ref false;
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fun trace_msg msg = if !trace then tracing (msg ()) else ();
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val (type_lits, type_lits_setup) = Attrib.config_bool "metis_type_lits" (K true);
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datatype mode = FO | HO | FT  (* first-order, higher-order, fully-typed *)
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(* ------------------------------------------------------------------------- *)
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(* Useful Theorems                                                           *)
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(* ------------------------------------------------------------------------- *)
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val EXCLUDED_MIDDLE = @{lemma "P ==> ~ P ==> False" by (rule notE)}
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val REFL_THM = Thm.incr_indexes 2 @{lemma "t ~= t ==> False" by simp}
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val subst_em = @{lemma "s = t ==> P s ==> ~ P t ==> False" by simp}
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val ssubst_em = @{lemma "s = t ==> P t ==> ~ P s ==> False" by simp}
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(* ------------------------------------------------------------------------- *)
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(* Useful Functions                                                          *)
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(* ------------------------------------------------------------------------- *)
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(* match untyped terms*)
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fun untyped_aconv (Const(a,_))   (Const(b,_))   = (a=b)
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  | untyped_aconv (Free(a,_))    (Free(b,_))    = (a=b)
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  | untyped_aconv (Var((a,_),_)) (Var((b,_),_)) = (a=b)   (*the index is ignored!*)
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  | untyped_aconv (Bound i)      (Bound j)      = (i=j)
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  | untyped_aconv (Abs(a,_,t))  (Abs(b,_,u))    = (a=b) andalso untyped_aconv t u
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  | untyped_aconv (t1$t2) (u1$u2)  = untyped_aconv t1 u1 andalso untyped_aconv t2 u2
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  | untyped_aconv _              _              = false;
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(* Finding the relative location of an untyped term within a list of terms *)
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fun get_index lit =
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  let val lit = Envir.eta_contract lit
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      fun get n [] = raise Empty
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        | get n (x::xs) = if untyped_aconv lit (Envir.eta_contract (HOLogic.dest_Trueprop x))
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                          then n  else get (n+1) xs
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  in get 1 end;
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(* ------------------------------------------------------------------------- *)
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(* HOL to FOL  (Isabelle to Metis)                                           *)
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(* ------------------------------------------------------------------------- *)
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fun fn_isa_to_met "equal" = "="
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  | fn_isa_to_met x       = x;
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fun metis_lit b c args = (b, (c, args));
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fun hol_type_to_fol (TyVar (x, _)) = Metis.Term.Var x
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  | hol_type_to_fol (TyFree (s, _)) = Metis.Term.Fn (s, [])
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  | hol_type_to_fol (TyConstr ((s, _), tps)) =
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    Metis.Term.Fn (s, map hol_type_to_fol tps);
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(*These two functions insert type literals before the real literals. That is the
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  opposite order from TPTP linkup, but maybe OK.*)
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fun hol_term_to_fol_FO tm =
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  case strip_combterm_comb tm of
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      (CombConst ((c, _), _, tys), tms) =>
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        let val tyargs = map hol_type_to_fol tys
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            val args   = map hol_term_to_fol_FO tms
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        in Metis.Term.Fn (c, tyargs @ args) end
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    | (CombVar ((v, _), _), []) => Metis.Term.Var v
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    | _ => raise Fail "hol_term_to_fol_FO";
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fun hol_term_to_fol_HO (CombVar ((s, _), _)) = Metis.Term.Var s
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  | hol_term_to_fol_HO (CombConst ((a, _), _, tylist)) =
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      Metis.Term.Fn (fn_isa_to_met a, map hol_type_to_fol tylist)
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  | hol_term_to_fol_HO (CombApp (tm1, tm2)) =
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       Metis.Term.Fn (".", map hol_term_to_fol_HO [tm1, tm2]);
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(*The fully-typed translation, to avoid type errors*)
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fun wrap_type (tm, ty) = Metis.Term.Fn("ti", [tm, hol_type_to_fol ty]);
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fun hol_term_to_fol_FT (CombVar ((s, _), ty)) = wrap_type (Metis.Term.Var s, ty)
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  | hol_term_to_fol_FT (CombConst((a, _), ty, _)) =
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      wrap_type (Metis.Term.Fn(fn_isa_to_met a, []), ty)
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  | hol_term_to_fol_FT (tm as CombApp(tm1,tm2)) =
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       wrap_type (Metis.Term.Fn(".", map hol_term_to_fol_FT [tm1,tm2]),
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                  type_of_combterm tm);
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fun hol_literal_to_fol FO (Literal (pol, tm)) =
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      let val (CombConst((p, _), _, tys), tms) = strip_combterm_comb tm
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          val tylits = if p = "equal" then [] else map hol_type_to_fol tys
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          val lits = map hol_term_to_fol_FO tms
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      in metis_lit pol (fn_isa_to_met p) (tylits @ lits) end
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  | hol_literal_to_fol HO (Literal (pol, tm)) =
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     (case strip_combterm_comb tm of
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          (CombConst(("equal", _), _, _), tms) =>
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            metis_lit pol "=" (map hol_term_to_fol_HO tms)
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        | _ => metis_lit pol "{}" [hol_term_to_fol_HO tm])   (*hBOOL*)
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  | hol_literal_to_fol FT (Literal (pol, tm)) =
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     (case strip_combterm_comb tm of
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          (CombConst(("equal", _), _, _), tms) =>
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            metis_lit pol "=" (map hol_term_to_fol_FT tms)
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        | _ => metis_lit pol "{}" [hol_term_to_fol_FT tm])   (*hBOOL*);
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fun literals_of_hol_term thy mode t =
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      let val (lits, types_sorts) = literals_of_term thy t
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      in  (map (hol_literal_to_fol mode) lits, types_sorts) end;
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(*Sign should be "true" for conjecture type constraints, "false" for type lits in clauses.*)
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fun metis_of_type_literals pos (TyLitVar (s, (s', _))) =
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    metis_lit pos s [Metis.Term.Var s']
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  | metis_of_type_literals pos (TyLitFree (s, (s', _))) =
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    metis_lit pos s [Metis.Term.Fn (s',[])]
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fun default_sort _ (TVar _) = false
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  | default_sort ctxt (TFree (x, s)) = (s = the_default [] (Variable.def_sort ctxt (x, ~1)));
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fun metis_of_tfree tf =
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  Metis.Thm.axiom (Metis.LiteralSet.singleton (metis_of_type_literals true tf));
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fun hol_thm_to_fol is_conjecture ctxt mode j skolem_somes th =
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  let
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    val thy = ProofContext.theory_of ctxt
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    val (skolem_somes, (mlits, types_sorts)) =
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     th |> prop_of |> kill_skolem_Eps j skolem_somes
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        ||> (HOLogic.dest_Trueprop #> literals_of_hol_term thy mode)
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  in
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      if is_conjecture then
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          (Metis.Thm.axiom (Metis.LiteralSet.fromList mlits),
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           type_literals_for_types types_sorts, skolem_somes)
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      else
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        let val tylits = filter_out (default_sort ctxt) types_sorts
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                         |> type_literals_for_types
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            val mtylits = if Config.get ctxt type_lits
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                          then map (metis_of_type_literals false) tylits else []
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        in
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          (Metis.Thm.axiom (Metis.LiteralSet.fromList(mtylits @ mlits)), [],
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           skolem_somes)
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        end
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  end;
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(* ARITY CLAUSE *)
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fun m_arity_cls (TConsLit (c,t,args)) =
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      metis_lit true (make_type_class c) [Metis.Term.Fn(t, map Metis.Term.Var args)]
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  | m_arity_cls (TVarLit (c,str))     =
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      metis_lit false (make_type_class c) [Metis.Term.Var str];
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(*TrueI is returned as the Isabelle counterpart because there isn't any.*)
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fun arity_cls (ArityClause {conclLit, premLits, ...}) =
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  (TrueI,
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   Metis.Thm.axiom (Metis.LiteralSet.fromList (map m_arity_cls (conclLit :: premLits))));
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(* CLASSREL CLAUSE *)
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fun m_classrel_cls subclass superclass =
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  [metis_lit false subclass [Metis.Term.Var "T"], metis_lit true superclass [Metis.Term.Var "T"]];
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fun classrel_cls (ClassrelClause {subclass, superclass, ...}) =
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  (TrueI, Metis.Thm.axiom (Metis.LiteralSet.fromList (m_classrel_cls subclass superclass)));
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(* ------------------------------------------------------------------------- *)
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(* FOL to HOL  (Metis to Isabelle)                                           *)
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(* ------------------------------------------------------------------------- *)
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datatype term_or_type = Term of Term.term | Type of Term.typ;
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fun terms_of [] = []
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  | terms_of (Term t :: tts) = t :: terms_of tts
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  | terms_of (Type _ :: tts) = terms_of tts;
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fun types_of [] = []
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  | types_of (Term (Term.Var ((a,idx), _)) :: tts) =
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      if String.isPrefix "_" a then
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          (*Variable generated by Metis, which might have been a type variable.*)
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          TVar (("'" ^ a, idx), HOLogic.typeS) :: types_of tts
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      else types_of tts
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  | types_of (Term _ :: tts) = types_of tts
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  | types_of (Type T :: tts) = T :: types_of tts;
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fun apply_list rator nargs rands =
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  let val trands = terms_of rands
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  in  if length trands = nargs then Term (list_comb(rator, trands))
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      else raise Fail
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        ("apply_list: wrong number of arguments: " ^ Syntax.string_of_term_global Pure.thy rator ^
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          " expected " ^ Int.toString nargs ^
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          " received " ^ commas (map (Syntax.string_of_term_global Pure.thy) trands))
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  end;
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fun infer_types ctxt =
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  Syntax.check_terms (ProofContext.set_mode ProofContext.mode_pattern ctxt);
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(*We use 1 rather than 0 because variable references in clauses may otherwise conflict
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  with variable constraints in the goal...at least, type inference often fails otherwise.
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  SEE ALSO axiom_inf below.*)
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fun mk_var (w,T) = Term.Var((w,1), T);
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(*include the default sort, if available*)
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fun mk_tfree ctxt w =
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  let val ww = "'" ^ w
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  in  TFree(ww, the_default HOLogic.typeS (Variable.def_sort ctxt (ww, ~1)))  end;
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(*Remove the "apply" operator from an HO term*)
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fun strip_happ args (Metis.Term.Fn(".",[t,u])) = strip_happ (u::args) t
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  | strip_happ args x = (x, args);
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fun make_tvar s = TVar (("'" ^ s, 0), HOLogic.typeS)
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fun fol_type_to_isa _ (Metis.Term.Var v) =
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     (case strip_prefix tvar_prefix v of
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          SOME w => make_tvar w
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        | NONE   => make_tvar v)
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  | fol_type_to_isa ctxt (Metis.Term.Fn(x, tys)) =
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     (case strip_prefix tconst_prefix x of
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          SOME tc => Term.Type (invert_type_const tc, map (fol_type_to_isa ctxt) tys)
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        | NONE    =>
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      case strip_prefix tfree_prefix x of
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          SOME tf => mk_tfree ctxt tf
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        | NONE    => raise Fail ("fol_type_to_isa: " ^ x));
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fun reintroduce_skolem_Eps thy skolem_somes =
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  let
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    fun aux Ts args t =
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      case t of
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        t1 $ t2 => aux Ts (aux Ts [] t2 :: args) t1
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      | Abs (s, T, t') => list_comb (Abs (s, T, aux (T :: Ts) [] t'), args)
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      | Const (s, T) =>
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        if String.isPrefix skolem_Eps_pseudo_theory s then
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          let
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            val (T', args', def') = AList.lookup (op =) skolem_somes s |> the
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          in
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            def' |> subst_free (args' ~~ args)
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                 |> map_types Type_Infer.paramify_vars
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          end
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        else
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          list_comb (t, args)
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      | t => list_comb (t, args)
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  in aux [] [] end
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(*Maps metis terms to isabelle terms*)
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fun hol_term_from_fol_PT ctxt fol_tm =
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  let val thy = ProofContext.theory_of ctxt
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      val _ = trace_msg (fn () => "hol_term_from_fol_PT: " ^
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                                  Metis.Term.toString fol_tm)
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      fun tm_to_tt (Metis.Term.Var v) =
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             (case strip_prefix tvar_prefix v of
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                  SOME w => Type (make_tvar w)
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                | NONE =>
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              case strip_prefix schematic_var_prefix v of
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                  SOME w => Term (mk_var (w, HOLogic.typeT))
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                | NONE   => Term (mk_var (v, HOLogic.typeT)) )
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                    (*Var from Metis with a name like _nnn; possibly a type variable*)
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        | tm_to_tt (Metis.Term.Fn ("{}", [arg])) = tm_to_tt arg   (*hBOOL*)
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        | tm_to_tt (t as Metis.Term.Fn (".",_)) =
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            let val (rator,rands) = strip_happ [] t
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            in  case rator of
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                    Metis.Term.Fn(fname,ts) => applic_to_tt (fname, ts @ rands)
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                  | _ => case tm_to_tt rator of
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                             Term t => Term (list_comb(t, terms_of (map tm_to_tt rands)))
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                           | _ => raise Fail "tm_to_tt: HO application"
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            end
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        | tm_to_tt (Metis.Term.Fn (fname, args)) = applic_to_tt (fname,args)
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      and applic_to_tt ("=",ts) =
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            Term (list_comb(Const (@{const_name "op ="}, HOLogic.typeT), terms_of (map tm_to_tt ts)))
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        | applic_to_tt (a,ts) =
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            case strip_prefix const_prefix a of
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                SOME b =>
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                  let val c = invert_const b
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                      val ntypes = num_type_args thy c
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                      val nterms = length ts - ntypes
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                      val tts = map tm_to_tt ts
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                      val tys = types_of (List.take(tts,ntypes))
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                  in if length tys = ntypes then
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                         apply_list (Const (c, dummyT)) nterms (List.drop(tts,ntypes))
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                     else
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                       raise Fail ("Constant " ^ c ^ " expects " ^ Int.toString ntypes ^
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                                   " but gets " ^ Int.toString (length tys) ^
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                                   " type arguments\n" ^
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                                   cat_lines (map (Syntax.string_of_typ ctxt) tys) ^
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                                   " the terms are \n" ^
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                                   cat_lines (map (Syntax.string_of_term ctxt) (terms_of tts)))
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                     end
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              | NONE => (*Not a constant. Is it a type constructor?*)
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            case strip_prefix tconst_prefix a of
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                SOME b =>
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                  Type (Term.Type (invert_type_const b, types_of (map tm_to_tt ts)))
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              | NONE => (*Maybe a TFree. Should then check that ts=[].*)
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            case strip_prefix tfree_prefix a of
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                SOME b => Type (mk_tfree ctxt b)
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              | NONE => (*a fixed variable? They are Skolem functions.*)
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            case strip_prefix fixed_var_prefix a of
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                SOME b =>
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                  let val opr = Term.Free(b, HOLogic.typeT)
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                  in  apply_list opr (length ts) (map tm_to_tt ts)  end
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              | NONE => raise Fail ("unexpected metis function: " ^ a)
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  in
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    case tm_to_tt fol_tm of
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      Term t => t
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    | _ => raise Fail "fol_tm_to_tt: Term expected"
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  end
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(*Maps fully-typed metis terms to isabelle terms*)
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fun hol_term_from_fol_FT ctxt fol_tm =
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  let val _ = trace_msg (fn () => "hol_term_from_fol_FT: " ^
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                                  Metis.Term.toString fol_tm)
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      fun cvt (Metis.Term.Fn ("ti", [Metis.Term.Var v, _])) =
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             (case strip_prefix schematic_var_prefix v of
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                  SOME w =>  mk_var(w, dummyT)
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                | NONE   => mk_var(v, dummyT))
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        | cvt (Metis.Term.Fn ("ti", [Metis.Term.Fn ("=",[]), _])) =
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            Const ("op =", HOLogic.typeT)
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        | cvt (Metis.Term.Fn ("ti", [Metis.Term.Fn (x,[]), ty])) =
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           (case strip_prefix const_prefix x of
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                SOME c => Const (invert_const c, dummyT)
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              | NONE => (*Not a constant. Is it a fixed variable??*)
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            case strip_prefix fixed_var_prefix x of
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                SOME v => Free (v, fol_type_to_isa ctxt ty)
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              | NONE => raise Fail ("hol_term_from_fol_FT bad constant: " ^ x))
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        | cvt (Metis.Term.Fn ("ti", [Metis.Term.Fn (".",[tm1,tm2]), _])) =
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            cvt tm1 $ cvt tm2
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        | cvt (Metis.Term.Fn (".",[tm1,tm2])) = (*untyped application*)
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            cvt tm1 $ cvt tm2
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        | cvt (Metis.Term.Fn ("{}", [arg])) = cvt arg   (*hBOOL*)
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        | cvt (Metis.Term.Fn ("=", [tm1,tm2])) =
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            list_comb(Const (@{const_name "op ="}, HOLogic.typeT), map cvt [tm1,tm2])
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        | cvt (t as Metis.Term.Fn (x, [])) =
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           (case strip_prefix const_prefix x of
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                SOME c => Const (invert_const c, dummyT)
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              | NONE => (*Not a constant. Is it a fixed variable??*)
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            case strip_prefix fixed_var_prefix x of
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                SOME v => Free (v, dummyT)
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              | NONE => (trace_msg (fn () => "hol_term_from_fol_FT bad const: " ^ x);
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                  hol_term_from_fol_PT ctxt t))
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        | cvt t = (trace_msg (fn () => "hol_term_from_fol_FT bad term: " ^ Metis.Term.toString t);
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            hol_term_from_fol_PT ctxt t)
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  in fol_tm |> cvt end
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fun hol_term_from_fol FT = hol_term_from_fol_FT
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  | hol_term_from_fol _ = hol_term_from_fol_PT
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fun hol_terms_from_fol ctxt mode skolem_somes fol_tms =
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  let val thy = ProofContext.theory_of ctxt
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      val ts = map (hol_term_from_fol mode ctxt) fol_tms
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      val _ = trace_msg (fn () => "  calling type inference:")
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      val _ = app (fn t => trace_msg (fn () => Syntax.string_of_term ctxt t)) ts
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      val ts' =
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        ts |> map (reintroduce_skolem_Eps thy skolem_somes) |> infer_types ctxt
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      val _ = app (fn t => trace_msg
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                    (fn () => "  final term: " ^ Syntax.string_of_term ctxt t ^
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                              "  of type  " ^ Syntax.string_of_typ ctxt (type_of t)))
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                  ts'
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  in  ts'  end;
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fun mk_not (Const (@{const_name Not}, _) $ b) = b
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  | mk_not b = HOLogic.mk_not b;
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val metis_eq = Metis.Term.Fn ("=", []);
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(* ------------------------------------------------------------------------- *)
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(* FOL step Inference Rules                                                  *)
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(* ------------------------------------------------------------------------- *)
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(*for debugging only*)
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fun print_thpair (fth,th) =
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  (trace_msg (fn () => "=============================================");
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   trace_msg (fn () => "Metis: " ^ Metis.Thm.toString fth);
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   trace_msg (fn () => "Isabelle: " ^ Display.string_of_thm_without_context th));
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fun lookth thpairs (fth : Metis.Thm.thm) =
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  the (AList.lookup (uncurry Metis.Thm.equal) thpairs fth)
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  handle Option =>
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         raise Fail ("Failed to find a Metis theorem " ^ Metis.Thm.toString fth);
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fun is_TrueI th = Thm.eq_thm(TrueI,th);
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fun cterm_incr_types thy idx = cterm_of thy o (map_types (Logic.incr_tvar idx));
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fun inst_excluded_middle thy i_atm =
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  let val th = EXCLUDED_MIDDLE
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      val [vx] = Term.add_vars (prop_of th) []
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      val substs = [(cterm_of thy (Var vx), cterm_of thy i_atm)]
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  in  cterm_instantiate substs th  end;
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(* INFERENCE RULE: AXIOM *)
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fun axiom_inf thpairs th = Thm.incr_indexes 1 (lookth thpairs th);
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    (*This causes variables to have an index of 1 by default. SEE ALSO mk_var above.*)
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(* INFERENCE RULE: ASSUME *)
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fun assume_inf ctxt mode skolem_somes atm =
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  inst_excluded_middle
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    (ProofContext.theory_of ctxt)
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    (singleton (hol_terms_from_fol ctxt mode skolem_somes) (Metis.Term.Fn atm))
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(* INFERENCE RULE: INSTANTIATE (Subst). Type instantiations are ignored. Trying to reconstruct
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   them admits new possibilities of errors, e.g. concerning sorts. Instead we try to arrange
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   that new TVars are distinct and that types can be inferred from terms.*)
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fun inst_inf ctxt mode skolem_somes thpairs fsubst th =
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  let val thy = ProofContext.theory_of ctxt
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      val i_th   = lookth thpairs th
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      val i_th_vars = Term.add_vars (prop_of i_th) []
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      fun find_var x = the (List.find (fn ((a,_),_) => a=x) i_th_vars)
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      fun subst_translation (x,y) =
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            let val v = find_var x
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                (* We call "reintroduce_skolem_Eps" and "infer_types" below. *)
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                val t = hol_term_from_fol mode ctxt y
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            in  SOME (cterm_of thy (Var v), t)  end
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            handle Option =>
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                (trace_msg (fn() => "List.find failed for the variable " ^ x ^
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                                       " in " ^ Display.string_of_thm ctxt i_th);
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                 NONE)
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      fun remove_typeinst (a, t) =
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            case strip_prefix schematic_var_prefix a of
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                SOME b => SOME (b, t)
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              | NONE   => case strip_prefix tvar_prefix a of
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diff changeset
   432
                SOME _ => NONE          (*type instantiations are forbidden!*)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   433
              | NONE   => SOME (a,t)    (*internal Metis var?*)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   434
      val _ = trace_msg (fn () => "  isa th: " ^ Display.string_of_thm ctxt i_th)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   435
      val substs = map_filter remove_typeinst (Metis.Subst.toList fsubst)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   436
      val (vars,rawtms) = ListPair.unzip (map_filter subst_translation substs)
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   437
      val tms = rawtms |> map (reintroduce_skolem_Eps thy skolem_somes)
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   438
                       |> infer_types ctxt
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   439
      val ctm_of = cterm_incr_types thy (1 + Thm.maxidx_of i_th)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   440
      val substs' = ListPair.zip (vars, map ctm_of tms)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   441
      val _ = trace_msg (fn () =>
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   442
        cat_lines ("subst_translations:" ::
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   443
          (substs' |> map (fn (x, y) =>
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   444
            Syntax.string_of_term ctxt (term_of x) ^ " |-> " ^
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   445
            Syntax.string_of_term ctxt (term_of y)))));
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   446
  in cterm_instantiate substs' i_th end
37318
32b3d16b04f6 give more helpful error message
blanchet
parents: 36967
diff changeset
   447
  handle THM (msg, _, _) => error ("metis error (inst_inf):\n" ^ msg)
32b3d16b04f6 give more helpful error message
blanchet
parents: 36967
diff changeset
   448
       | ERROR msg => error ("metis error (inst_inf):\n" ^ msg ^
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   449
                             "\n(Perhaps you want to try \"metisFT\" if you \
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   450
                             \haven't done so already.)")
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   451
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   452
(* INFERENCE RULE: RESOLVE *)
25713
1c45623e0edf removed duplicate CRITICAL markup;
wenzelm
parents: 25710
diff changeset
   453
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   454
(*Like RSN, but we rename apart only the type variables. Vars here typically have an index
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   455
  of 1, and the use of RSN would increase this typically to 3. Instantiations of those Vars
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   456
  could then fail. See comment on mk_var.*)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   457
fun resolve_inc_tyvars(tha,i,thb) =
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   458
  let val tha = Drule.incr_type_indexes (1 + Thm.maxidx_of thb) tha
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   459
      val ths = Seq.list_of (Thm.bicompose false (false,tha,nprems_of tha) i thb)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   460
  in
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   461
      case distinct Thm.eq_thm ths of
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   462
        [th] => th
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   463
      | _ => raise THM ("resolve_inc_tyvars: unique result expected", i, [tha,thb])
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   464
  end;
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   465
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   466
fun resolve_inf ctxt mode skolem_somes thpairs atm th1 th2 =
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   467
  let
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   468
    val i_th1 = lookth thpairs th1 and i_th2 = lookth thpairs th2
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   469
    val _ = trace_msg (fn () => "  isa th1 (pos): " ^ Display.string_of_thm ctxt i_th1)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   470
    val _ = trace_msg (fn () => "  isa th2 (neg): " ^ Display.string_of_thm ctxt i_th2)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   471
  in
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   472
    if is_TrueI i_th1 then i_th2 (*Trivial cases where one operand is type info*)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   473
    else if is_TrueI i_th2 then i_th1
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   474
    else
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   475
      let
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   476
        val i_atm = singleton (hol_terms_from_fol ctxt mode skolem_somes)
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   477
                              (Metis.Term.Fn atm)
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   478
        val _ = trace_msg (fn () => "  atom: " ^ Syntax.string_of_term ctxt i_atm)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   479
        val prems_th1 = prems_of i_th1
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   480
        val prems_th2 = prems_of i_th2
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   481
        val index_th1 = get_index (mk_not i_atm) prems_th1
37402
12cb33916e37 "raise Fail" for internal errors + one new internal error (instead of "Match")
blanchet
parents: 37399
diff changeset
   482
              handle Empty => raise Fail "Failed to find literal in th1"
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   483
        val _ = trace_msg (fn () => "  index_th1: " ^ Int.toString index_th1)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   484
        val index_th2 = get_index i_atm prems_th2
37402
12cb33916e37 "raise Fail" for internal errors + one new internal error (instead of "Match")
blanchet
parents: 37399
diff changeset
   485
              handle Empty => raise Fail "Failed to find literal in th2"
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   486
        val _ = trace_msg (fn () => "  index_th2: " ^ Int.toString index_th2)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   487
    in  resolve_inc_tyvars (Meson.select_literal index_th1 i_th1, index_th2, i_th2)  end
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   488
  end;
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   489
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   490
(* INFERENCE RULE: REFL *)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   491
val refl_x = cterm_of @{theory} (Var (hd (Term.add_vars (prop_of REFL_THM) [])));
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   492
val refl_idx = 1 + Thm.maxidx_of REFL_THM;
25713
1c45623e0edf removed duplicate CRITICAL markup;
wenzelm
parents: 25710
diff changeset
   493
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   494
fun refl_inf ctxt mode skolem_somes t =
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   495
  let val thy = ProofContext.theory_of ctxt
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   496
      val i_t = singleton (hol_terms_from_fol ctxt mode skolem_somes) t
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   497
      val _ = trace_msg (fn () => "  term: " ^ Syntax.string_of_term ctxt i_t)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   498
      val c_t = cterm_incr_types thy refl_idx i_t
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   499
  in  cterm_instantiate [(refl_x, c_t)] REFL_THM  end;
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   500
35865
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   501
fun get_ty_arg_size _ (Const (@{const_name "op ="}, _)) = 0  (*equality has no type arguments*)
36909
7d5587f6d5f7 made Sledgehammer's full-typed proof reconstruction work for the first time;
blanchet
parents: 36556
diff changeset
   502
  | get_ty_arg_size thy (Const (c, _)) = (num_type_args thy c handle TYPE _ => 0)
32994
ccc07fbbfefd removed some unreferenced material;
wenzelm
parents: 32956
diff changeset
   503
  | get_ty_arg_size _ _ = 0;
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   504
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   505
(* INFERENCE RULE: EQUALITY *)
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   506
fun equality_inf ctxt mode skolem_somes (pos, atm) fp fr =
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   507
  let val thy = ProofContext.theory_of ctxt
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   508
      val m_tm = Metis.Term.Fn atm
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   509
      val [i_atm,i_tm] = hol_terms_from_fol ctxt mode skolem_somes [m_tm, fr]
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   510
      val _ = trace_msg (fn () => "sign of the literal: " ^ Bool.toString pos)
32994
ccc07fbbfefd removed some unreferenced material;
wenzelm
parents: 32956
diff changeset
   511
      fun replace_item_list lx 0 (_::ls) = lx::ls
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   512
        | replace_item_list lx i (l::ls) = l :: replace_item_list lx (i-1) ls
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   513
      fun path_finder_FO tm [] = (tm, Term.Bound 0)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   514
        | path_finder_FO tm (p::ps) =
35865
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   515
            let val (tm1,args) = strip_comb tm
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   516
                val adjustment = get_ty_arg_size thy tm1
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   517
                val p' = if adjustment > p then p else p-adjustment
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   518
                val tm_p = List.nth(args,p')
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   519
                  handle Subscript => error ("equality_inf: " ^ Int.toString p ^ " adj " ^
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   520
                    Int.toString adjustment  ^ " term " ^  Syntax.string_of_term ctxt tm)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   521
                val _ = trace_msg (fn () => "path_finder: " ^ Int.toString p ^
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   522
                                      "  " ^ Syntax.string_of_term ctxt tm_p)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   523
                val (r,t) = path_finder_FO tm_p ps
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   524
            in
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   525
                (r, list_comb (tm1, replace_item_list t p' args))
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   526
            end
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   527
      fun path_finder_HO tm [] = (tm, Term.Bound 0)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   528
        | path_finder_HO (t$u) (0::ps) = (fn(x,y) => (x, y$u)) (path_finder_HO t ps)
32994
ccc07fbbfefd removed some unreferenced material;
wenzelm
parents: 32956
diff changeset
   529
        | path_finder_HO (t$u) (_::ps) = (fn(x,y) => (x, t$y)) (path_finder_HO u ps)
37402
12cb33916e37 "raise Fail" for internal errors + one new internal error (instead of "Match")
blanchet
parents: 37399
diff changeset
   530
        | path_finder_HO tm ps =
12cb33916e37 "raise Fail" for internal errors + one new internal error (instead of "Match")
blanchet
parents: 37399
diff changeset
   531
          raise Fail ("equality_inf, path_finder_HO: path = " ^
12cb33916e37 "raise Fail" for internal errors + one new internal error (instead of "Match")
blanchet
parents: 37399
diff changeset
   532
                      space_implode " " (map Int.toString ps) ^
12cb33916e37 "raise Fail" for internal errors + one new internal error (instead of "Match")
blanchet
parents: 37399
diff changeset
   533
                      " isa-term: " ^  Syntax.string_of_term ctxt tm)
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   534
      fun path_finder_FT tm [] _ = (tm, Term.Bound 0)
32994
ccc07fbbfefd removed some unreferenced material;
wenzelm
parents: 32956
diff changeset
   535
        | path_finder_FT tm (0::ps) (Metis.Term.Fn ("ti", [t1, _])) =
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   536
            path_finder_FT tm ps t1
32994
ccc07fbbfefd removed some unreferenced material;
wenzelm
parents: 32956
diff changeset
   537
        | path_finder_FT (t$u) (0::ps) (Metis.Term.Fn (".", [t1, _])) =
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   538
            (fn(x,y) => (x, y$u)) (path_finder_FT t ps t1)
32994
ccc07fbbfefd removed some unreferenced material;
wenzelm
parents: 32956
diff changeset
   539
        | path_finder_FT (t$u) (1::ps) (Metis.Term.Fn (".", [_, t2])) =
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   540
            (fn(x,y) => (x, t$y)) (path_finder_FT u ps t2)
37402
12cb33916e37 "raise Fail" for internal errors + one new internal error (instead of "Match")
blanchet
parents: 37399
diff changeset
   541
        | path_finder_FT tm ps t =
12cb33916e37 "raise Fail" for internal errors + one new internal error (instead of "Match")
blanchet
parents: 37399
diff changeset
   542
          raise Fail ("equality_inf, path_finder_FT: path = " ^
12cb33916e37 "raise Fail" for internal errors + one new internal error (instead of "Match")
blanchet
parents: 37399
diff changeset
   543
                      space_implode " " (map Int.toString ps) ^
12cb33916e37 "raise Fail" for internal errors + one new internal error (instead of "Match")
blanchet
parents: 37399
diff changeset
   544
                      " isa-term: " ^  Syntax.string_of_term ctxt tm ^
12cb33916e37 "raise Fail" for internal errors + one new internal error (instead of "Match")
blanchet
parents: 37399
diff changeset
   545
                      " fol-term: " ^ Metis.Term.toString t)
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   546
      fun path_finder FO tm ps _ = path_finder_FO tm ps
35865
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   547
        | path_finder HO (tm as Const(@{const_name "op ="},_) $ _ $ _) (p::ps) _ =
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   548
             (*equality: not curried, as other predicates are*)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   549
             if p=0 then path_finder_HO tm (0::1::ps)  (*select first operand*)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   550
             else path_finder_HO tm (p::ps)        (*1 selects second operand*)
32994
ccc07fbbfefd removed some unreferenced material;
wenzelm
parents: 32956
diff changeset
   551
        | path_finder HO tm (_ :: ps) (Metis.Term.Fn ("{}", [_])) =
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   552
             path_finder_HO tm ps      (*if not equality, ignore head to skip hBOOL*)
35865
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   553
        | path_finder FT (tm as Const(@{const_name "op ="}, _) $ _ $ _) (p::ps)
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   554
                            (Metis.Term.Fn ("=", [t1,t2])) =
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   555
             (*equality: not curried, as other predicates are*)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   556
             if p=0 then path_finder_FT tm (0::1::ps)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   557
                          (Metis.Term.Fn (".", [Metis.Term.Fn (".", [metis_eq,t1]), t2]))
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   558
                          (*select first operand*)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   559
             else path_finder_FT tm (p::ps)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   560
                   (Metis.Term.Fn (".", [metis_eq,t2]))
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   561
                   (*1 selects second operand*)
32994
ccc07fbbfefd removed some unreferenced material;
wenzelm
parents: 32956
diff changeset
   562
        | path_finder FT tm (_ :: ps) (Metis.Term.Fn ("{}", [t1])) = path_finder_FT tm ps t1
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   563
             (*if not equality, ignore head to skip the hBOOL predicate*)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   564
        | path_finder FT tm ps t = path_finder_FT tm ps t  (*really an error case!*)
35865
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   565
      fun path_finder_lit ((nt as Const (@{const_name Not}, _)) $ tm_a) idx =
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   566
            let val (tm, tm_rslt) = path_finder mode tm_a idx m_tm
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   567
            in (tm, nt $ tm_rslt) end
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   568
        | path_finder_lit tm_a idx = path_finder mode tm_a idx m_tm
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   569
      val (tm_subst, body) = path_finder_lit i_atm fp
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   570
      val tm_abs = Term.Abs("x", Term.type_of tm_subst, body)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   571
      val _ = trace_msg (fn () => "abstraction: " ^ Syntax.string_of_term ctxt tm_abs)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   572
      val _ = trace_msg (fn () => "i_tm: " ^ Syntax.string_of_term ctxt i_tm)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   573
      val _ = trace_msg (fn () => "located term: " ^ Syntax.string_of_term ctxt tm_subst)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   574
      val imax = maxidx_of_term (i_tm $ tm_abs $ tm_subst)  (*ill typed but gives right max*)
36945
9bec62c10714 less pervasive names from structure Thm;
wenzelm
parents: 36909
diff changeset
   575
      val subst' = Thm.incr_indexes (imax+1) (if pos then subst_em else ssubst_em)
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   576
      val _ = trace_msg (fn () => "subst' " ^ Display.string_of_thm ctxt subst')
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   577
      val eq_terms = map (pairself (cterm_of thy))
33227
83322d668601 avoid structure alias;
wenzelm
parents: 33042
diff changeset
   578
        (ListPair.zip (OldTerm.term_vars (prop_of subst'), [tm_abs, tm_subst, i_tm]))
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   579
  in  cterm_instantiate eq_terms subst'  end;
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   580
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   581
val factor = Seq.hd o distinct_subgoals_tac;
28528
0cf2749e8ef7 The result of the equality inference rule no longer undergoes factoring.
paulson
parents: 28262
diff changeset
   582
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   583
fun step ctxt mode skolem_somes thpairs p =
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   584
  case p of
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   585
    (fol_th, Metis.Proof.Axiom _) => factor (axiom_inf thpairs fol_th)
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   586
  | (_, Metis.Proof.Assume f_atm) => assume_inf ctxt mode skolem_somes f_atm
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   587
  | (_, Metis.Proof.Subst (f_subst, f_th1)) =>
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   588
    factor (inst_inf ctxt mode skolem_somes thpairs f_subst f_th1)
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   589
  | (_, Metis.Proof.Resolve(f_atm, f_th1, f_th2)) =>
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   590
    factor (resolve_inf ctxt mode skolem_somes thpairs f_atm f_th1 f_th2)
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   591
  | (_, Metis.Proof.Refl f_tm) => refl_inf ctxt mode skolem_somes f_tm
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   592
  | (_, Metis.Proof.Equality (f_lit, f_p, f_r)) =>
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   593
    equality_inf ctxt mode skolem_somes f_lit f_p f_r
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   594
35865
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   595
fun real_literal (_, (c, _)) = not (String.isPrefix class_prefix c);
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   596
37402
12cb33916e37 "raise Fail" for internal errors + one new internal error (instead of "Match")
blanchet
parents: 37399
diff changeset
   597
(* FIXME: use "fold" instead *)
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   598
fun translate _ _ _ thpairs [] = thpairs
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   599
  | translate ctxt mode skolem_somes thpairs ((fol_th, inf) :: infpairs) =
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   600
      let val _ = trace_msg (fn () => "=============================================")
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   601
          val _ = trace_msg (fn () => "METIS THM: " ^ Metis.Thm.toString fol_th)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   602
          val _ = trace_msg (fn () => "INFERENCE: " ^ Metis.Proof.inferenceToString inf)
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   603
          val th = Meson.flexflex_first_order (step ctxt mode skolem_somes
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   604
                                                    thpairs (fol_th, inf))
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   605
          val _ = trace_msg (fn () => "ISABELLE THM: " ^ Display.string_of_thm ctxt th)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   606
          val _ = trace_msg (fn () => "=============================================")
32994
ccc07fbbfefd removed some unreferenced material;
wenzelm
parents: 32956
diff changeset
   607
          val n_metis_lits =
ccc07fbbfefd removed some unreferenced material;
wenzelm
parents: 32956
diff changeset
   608
            length (filter real_literal (Metis.LiteralSet.toList (Metis.Thm.clause fol_th)))
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   609
      in
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   610
          if nprems_of th = n_metis_lits then ()
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   611
          else error "Metis: proof reconstruction has gone wrong";
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   612
          translate ctxt mode skolem_somes ((fol_th, th) :: thpairs) infpairs
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   613
      end;
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   614
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   615
(*Determining which axiom clauses are actually used*)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   616
fun used_axioms axioms (th, Metis.Proof.Axiom _) = SOME (lookth axioms th)
32994
ccc07fbbfefd removed some unreferenced material;
wenzelm
parents: 32956
diff changeset
   617
  | used_axioms _ _ = NONE;
24855
161eb8381b49 metis method: used theorems
paulson
parents: 24827
diff changeset
   618
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   619
(* ------------------------------------------------------------------------- *)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   620
(* Translation of HO Clauses                                                 *)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   621
(* ------------------------------------------------------------------------- *)
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   622
35865
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   623
fun cnf_th thy th = hd (cnf_axiom thy th);
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   624
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   625
fun type_ext thy tms =
35865
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   626
  let val subs = tfree_classes_of_terms tms
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   627
      val supers = tvar_classes_of_terms tms
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   628
      and tycons = type_consts_of_terms thy tms
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   629
      val (supers', arity_clauses) = make_arity_clauses thy tycons supers
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   630
      val classrel_clauses = make_classrel_clauses thy subs supers'
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   631
  in  map classrel_cls classrel_clauses @ map arity_cls arity_clauses
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   632
  end;
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   633
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   634
(* ------------------------------------------------------------------------- *)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   635
(* Logic maps manage the interface between HOL and first-order logic.        *)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   636
(* ------------------------------------------------------------------------- *)
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   637
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   638
type logic_map =
35865
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   639
  {axioms: (Metis.Thm.thm * thm) list,
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   640
   tfrees: type_literal list,
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   641
   skolem_somes: (string * (typ * term list * term)) list}
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   642
32994
ccc07fbbfefd removed some unreferenced material;
wenzelm
parents: 32956
diff changeset
   643
fun const_in_metis c (pred, tm_list) =
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   644
  let
32994
ccc07fbbfefd removed some unreferenced material;
wenzelm
parents: 32956
diff changeset
   645
    fun in_mterm (Metis.Term.Var _) = false
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   646
      | in_mterm (Metis.Term.Fn (".", tm_list)) = exists in_mterm tm_list
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   647
      | in_mterm (Metis.Term.Fn (nm, tm_list)) = c=nm orelse exists in_mterm tm_list
32994
ccc07fbbfefd removed some unreferenced material;
wenzelm
parents: 32956
diff changeset
   648
  in  c = pred orelse exists in_mterm tm_list  end;
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   649
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   650
(*Extract TFree constraints from context to include as conjecture clauses*)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   651
fun init_tfrees ctxt =
36966
adc11fb3f3aa generate proper arity declarations for TFrees for SPASS's DFG format;
blanchet
parents: 36945
diff changeset
   652
  let fun add ((a,i),s) Ts = if i = ~1 then TFree(a,s) :: Ts else Ts in
adc11fb3f3aa generate proper arity declarations for TFrees for SPASS's DFG format;
blanchet
parents: 36945
diff changeset
   653
    Vartab.fold add (#2 (Variable.constraints_of ctxt)) []
adc11fb3f3aa generate proper arity declarations for TFrees for SPASS's DFG format;
blanchet
parents: 36945
diff changeset
   654
    |> type_literals_for_types
36556
81dc2c20f052 use readable names in "debug" mode for type vars + don't pipe facts using "using" but rather give them directly to metis (works better with type variables)
blanchet
parents: 36401
diff changeset
   655
  end;
24937
340523598914 context-based treatment of generalization; also handling TFrees in axiom clauses
paulson
parents: 24920
diff changeset
   656
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   657
(*transform isabelle type / arity clause to metis clause *)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   658
fun add_type_thm [] lmap = lmap
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   659
  | add_type_thm ((ith, mth) :: cls) {axioms, tfrees, skolem_somes} =
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   660
      add_type_thm cls {axioms = (mth, ith) :: axioms, tfrees = tfrees,
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   661
                        skolem_somes = skolem_somes}
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   662
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   663
(*Insert non-logical axioms corresponding to all accumulated TFrees*)
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   664
fun add_tfrees {axioms, tfrees, skolem_somes} : logic_map =
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   665
     {axioms = map (rpair TrueI o metis_of_tfree) (distinct (op =) tfrees) @
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   666
               axioms,
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   667
      tfrees = tfrees, skolem_somes = skolem_somes}
25713
1c45623e0edf removed duplicate CRITICAL markup;
wenzelm
parents: 25710
diff changeset
   668
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   669
fun string_of_mode FO = "FO"
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   670
  | string_of_mode HO = "HO"
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   671
  | string_of_mode FT = "FT"
32532
a0a54a51b15b My umpteenth attempt to commit the method metisFT, a fully-typed version of metis
paulson
parents: 32530
diff changeset
   672
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   673
(* Function to generate metis clauses, including comb and type clauses *)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   674
fun build_map mode0 ctxt cls ths =
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   675
  let val thy = ProofContext.theory_of ctxt
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   676
      (*The modes FO and FT are sticky. HO can be downgraded to FO.*)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   677
      fun set_mode FO = FO
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   678
        | set_mode HO =
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   679
          if forall (is_quasi_fol_term thy o prop_of) (cls @ ths) then FO
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   680
          else HO
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   681
        | set_mode FT = FT
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   682
      val mode = set_mode mode0
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   683
      (*transform isabelle clause to metis clause *)
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   684
      fun add_thm is_conjecture ith {axioms, tfrees, skolem_somes} : logic_map =
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   685
        let
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   686
          val (mth, tfree_lits, skolem_somes) =
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   687
            hol_thm_to_fol is_conjecture ctxt mode (length axioms) skolem_somes
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   688
                           ith
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   689
        in
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   690
           {axioms = (mth, Meson.make_meta_clause ith) :: axioms,
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   691
            tfrees = union (op =) tfree_lits tfrees,
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   692
            skolem_somes = skolem_somes}
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   693
        end;
37402
12cb33916e37 "raise Fail" for internal errors + one new internal error (instead of "Match")
blanchet
parents: 37399
diff changeset
   694
      val lmap as {skolem_somes, ...} =
12cb33916e37 "raise Fail" for internal errors + one new internal error (instead of "Match")
blanchet
parents: 37399
diff changeset
   695
        {axioms = [], tfrees = init_tfrees ctxt, skolem_somes = []}
12cb33916e37 "raise Fail" for internal errors + one new internal error (instead of "Match")
blanchet
parents: 37399
diff changeset
   696
        |> fold (add_thm true) cls
12cb33916e37 "raise Fail" for internal errors + one new internal error (instead of "Match")
blanchet
parents: 37399
diff changeset
   697
        |> add_tfrees
12cb33916e37 "raise Fail" for internal errors + one new internal error (instead of "Match")
blanchet
parents: 37399
diff changeset
   698
        |> fold (add_thm false) ths
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   699
      val clause_lists = map (Metis.Thm.clause o #1) (#axioms lmap)
32994
ccc07fbbfefd removed some unreferenced material;
wenzelm
parents: 32956
diff changeset
   700
      fun used c = exists (Metis.LiteralSet.exists (const_in_metis c o #2)) clause_lists
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   701
      (*Now check for the existence of certain combinators*)
35865
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   702
      val thI  = if used "c_COMBI" then [cnf_th @{theory} @{thm COMBI_def}] else []
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   703
      val thK  = if used "c_COMBK" then [cnf_th @{theory} @{thm COMBK_def}] else []
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   704
      val thB   = if used "c_COMBB" then [cnf_th @{theory} @{thm COMBB_def}] else []
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   705
      val thC   = if used "c_COMBC" then [cnf_th @{theory} @{thm COMBC_def}] else []
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   706
      val thS   = if used "c_COMBS" then [cnf_th @{theory} @{thm COMBS_def}] else []
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   707
      val thEQ  = if used "c_fequal" then [cnf_th @{theory} @{thm fequal_imp_equal}, cnf_th @{theory} @{thm equal_imp_fequal}] else []
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   708
      val lmap =
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   709
        lmap |> mode <> FO
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   710
                ? fold (add_thm false) (thEQ @ thS @ thC @ thB @ thK @ thI)
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   711
  in
37402
12cb33916e37 "raise Fail" for internal errors + one new internal error (instead of "Match")
blanchet
parents: 37399
diff changeset
   712
      (mode, add_type_thm (type_ext thy 
12cb33916e37 "raise Fail" for internal errors + one new internal error (instead of "Match")
blanchet
parents: 37399
diff changeset
   713
                                (* FIXME: Call"kill_skolem_Eps" here? *)
12cb33916e37 "raise Fail" for internal errors + one new internal error (instead of "Match")
blanchet
parents: 37399
diff changeset
   714
                          (map ((*snd o kill_skolem_Eps ~1 skolem_somes o*) prop_of)
12cb33916e37 "raise Fail" for internal errors + one new internal error (instead of "Match")
blanchet
parents: 37399
diff changeset
   715
                               (cls @ ths))) lmap)
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   716
  end;
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   717
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   718
fun refute cls =
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   719
    Metis.Resolution.loop (Metis.Resolution.new Metis.Resolution.default cls);
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   720
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   721
fun is_false t = t aconv (HOLogic.mk_Trueprop HOLogic.false_const);
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   722
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   723
fun common_thm ths1 ths2 = exists (member Thm.eq_thm ths1) (map Meson.make_meta_clause ths2);
24855
161eb8381b49 metis method: used theorems
paulson
parents: 24827
diff changeset
   724
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   725
exception METIS of string;
28233
f14f34194f63 The metis method now fails in the usual manner, rather than raising an exception,
paulson
parents: 28175
diff changeset
   726
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   727
(* Main function to start metis proof and reconstruction *)
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   728
fun FOL_SOLVE mode ctxt cls ths0 =
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   729
  let val thy = ProofContext.theory_of ctxt
35826
1590abc3d42a renamed Sledgehammer structures
blanchet
parents: 35825
diff changeset
   730
      val th_cls_pairs =
35865
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   731
        map (fn th => (Thm.get_name_hint th, cnf_axiom thy th)) ths0
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   732
      val ths = maps #2 th_cls_pairs
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   733
      val _ = trace_msg (fn () => "FOL_SOLVE: CONJECTURE CLAUSES")
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   734
      val _ = app (fn th => trace_msg (fn () => Display.string_of_thm ctxt th)) cls
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   735
      val _ = trace_msg (fn () => "THEOREM CLAUSES")
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   736
      val _ = app (fn th => trace_msg (fn () => Display.string_of_thm ctxt th)) ths
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   737
      val (mode, {axioms, tfrees, skolem_somes}) = build_map mode ctxt cls ths
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   738
      val _ = if null tfrees then ()
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   739
              else (trace_msg (fn () => "TFREE CLAUSES");
36556
81dc2c20f052 use readable names in "debug" mode for type vars + don't pipe facts using "using" but rather give them directly to metis (works better with type variables)
blanchet
parents: 36401
diff changeset
   740
                    app (fn tf => trace_msg (fn _ => tptp_of_type_literal true tf NONE |> fst)) tfrees)
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   741
      val _ = trace_msg (fn () => "CLAUSES GIVEN TO METIS")
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   742
      val thms = map #1 axioms
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   743
      val _ = app (fn th => trace_msg (fn () => Metis.Thm.toString th)) thms
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   744
      val _ = trace_msg (fn () => "mode = " ^ string_of_mode mode)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   745
      val _ = trace_msg (fn () => "START METIS PROVE PROCESS")
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   746
  in
33317
b4534348b8fd standardized filter/filter_out;
wenzelm
parents: 33316
diff changeset
   747
      case filter (is_false o prop_of) cls of
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   748
          false_th::_ => [false_th RS @{thm FalseE}]
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   749
        | [] =>
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   750
      case refute thms of
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   751
          Metis.Resolution.Contradiction mth =>
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   752
            let val _ = trace_msg (fn () => "METIS RECONSTRUCTION START: " ^
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   753
                          Metis.Thm.toString mth)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   754
                val ctxt' = fold Variable.declare_constraints (map prop_of cls) ctxt
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   755
                             (*add constraints arising from converting goal to clause form*)
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   756
                val proof = Metis.Proof.proof mth
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37318
diff changeset
   757
                val result = translate ctxt' mode skolem_somes axioms proof
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   758
                and used = map_filter (used_axioms axioms) proof
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   759
                val _ = trace_msg (fn () => "METIS COMPLETED...clauses actually used:")
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   760
                val _ = app (fn th => trace_msg (fn () => Display.string_of_thm ctxt th)) used
33305
wenzelm
parents: 33243
diff changeset
   761
                val unused = th_cls_pairs |> map_filter (fn (name, cls) =>
wenzelm
parents: 33243
diff changeset
   762
                  if common_thm used cls then NONE else SOME name)
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   763
            in
36383
6adf1068ac0f better error reporting;
blanchet
parents: 36230
diff changeset
   764
                if not (null cls) andalso not (common_thm used cls) then
6adf1068ac0f better error reporting;
blanchet
parents: 36230
diff changeset
   765
                  warning "Metis: The assumptions are inconsistent."
6adf1068ac0f better error reporting;
blanchet
parents: 36230
diff changeset
   766
                else
6adf1068ac0f better error reporting;
blanchet
parents: 36230
diff changeset
   767
                  ();
6adf1068ac0f better error reporting;
blanchet
parents: 36230
diff changeset
   768
                if not (null unused) then
36230
43d10a494c91 added warning about inconsistent context to Metis;
blanchet
parents: 36170
diff changeset
   769
                  warning ("Metis: Unused theorems: " ^ commas_quote unused
43d10a494c91 added warning about inconsistent context to Metis;
blanchet
parents: 36170
diff changeset
   770
                           ^ ".")
43d10a494c91 added warning about inconsistent context to Metis;
blanchet
parents: 36170
diff changeset
   771
                else
43d10a494c91 added warning about inconsistent context to Metis;
blanchet
parents: 36170
diff changeset
   772
                  ();
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   773
                case result of
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   774
                    (_,ith)::_ =>
36230
43d10a494c91 added warning about inconsistent context to Metis;
blanchet
parents: 36170
diff changeset
   775
                        (trace_msg (fn () => "Success: " ^ Display.string_of_thm ctxt ith);
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   776
                         [ith])
36230
43d10a494c91 added warning about inconsistent context to Metis;
blanchet
parents: 36170
diff changeset
   777
                  | _ => (trace_msg (fn () => "Metis: No result");
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   778
                          [])
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   779
            end
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   780
        | Metis.Resolution.Satisfiable _ =>
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   781
            (trace_msg (fn () => "Metis: No first-order proof with the lemmas supplied");
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   782
             [])
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   783
  end;
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   784
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   785
fun metis_general_tac mode ctxt ths i st0 =
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   786
  let val _ = trace_msg (fn () =>
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   787
        "Metis called with theorems " ^ cat_lines (map (Display.string_of_thm ctxt) ths))
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   788
  in
35865
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   789
    if exists_type type_has_topsort (prop_of st0)
35568
8fbbfc39508f renamed type_has_empty_sort to type_has_topsort -- {} is the full universal sort;
wenzelm
parents: 34087
diff changeset
   790
    then raise METIS "Metis: Proof state contains the universal sort {}"
8fbbfc39508f renamed type_has_empty_sort to type_has_topsort -- {} is the full universal sort;
wenzelm
parents: 34087
diff changeset
   791
    else
36401
31252c4d4923 adapt code to reflect new signature of "neg_clausify"
blanchet
parents: 36383
diff changeset
   792
      (Meson.MESON (maps neg_clausify)
35568
8fbbfc39508f renamed type_has_empty_sort to type_has_topsort -- {} is the full universal sort;
wenzelm
parents: 34087
diff changeset
   793
        (fn cls => resolve_tac (FOL_SOLVE mode ctxt cls ths) 1) ctxt i
35865
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   794
          THEN Meson_Tactic.expand_defs_tac st0) st0
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   795
  end
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   796
  handle METIS s => (warning ("Metis: " ^ s); Seq.empty);
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   797
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   798
val metis_tac = metis_general_tac HO;
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   799
val metisF_tac = metis_general_tac FO;
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   800
val metisFT_tac = metis_general_tac FT;
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   801
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   802
fun method name mode comment = Method.setup name (Attrib.thms >> (fn ths => fn ctxt =>
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   803
  SIMPLE_METHOD' (CHANGED_PROP o metis_general_tac mode ctxt ths))) comment;
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   804
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   805
val setup =
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   806
  type_lits_setup #>
35865
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   807
  method @{binding metis} HO "METIS for FOL and HOL problems" #>
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   808
  method @{binding metisF} FO "METIS for FOL problems" #>
35568
8fbbfc39508f renamed type_has_empty_sort to type_has_topsort -- {} is the full universal sort;
wenzelm
parents: 34087
diff changeset
   809
  method @{binding metisFT} FT "METIS with fully-typed translation" #>
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   810
  Method.setup @{binding finish_clausify}
35865
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35826
diff changeset
   811
    (Scan.succeed (K (SIMPLE_METHOD (Meson_Tactic.expand_defs_tac refl))))
32956
c39860141415 tuned white space;
wenzelm
parents: 32955
diff changeset
   812
    "cleanup after conversion to clauses";
23442
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   813
028e39e5e8f3 The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff changeset
   814
end;