src/HOL/Tools/Sledgehammer/sledgehammer_atp_translate.ML
author wenzelm
Tue, 28 Dec 2010 18:28:52 +0100
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(*  Title:      HOL/Tools/Sledgehammer/sledgehammer_atp_translate.ML
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    Author:     Fabian Immler, TU Muenchen
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    Author:     Makarius
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    Author:     Jasmin Blanchette, TU Muenchen
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Translation of HOL to FOL for Sledgehammer.
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*)
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signature SLEDGEHAMMER_ATP_TRANSLATE =
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sig
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  type 'a problem = 'a ATP_Problem.problem
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  type translated_formula
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  datatype type_system =
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    Tags of bool |
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    Preds of bool |
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    Const_Args |
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    No_Types
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  val precise_overloaded_args : bool Unsynchronized.ref
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  val fact_prefix : string
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  val conjecture_prefix : string
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  val types_dangerous_types : type_system -> bool
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  val num_atp_type_args : theory -> type_system -> string -> int
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  val translate_atp_fact :
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    Proof.context -> (string * 'a) * thm
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    -> translated_formula option * ((string * 'a) * thm)
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  val prepare_atp_problem :
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    Proof.context -> bool -> bool -> type_system -> bool -> term list -> term
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    -> (translated_formula option * ((string * 'a) * thm)) list
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    -> string problem * string Symtab.table * int * (string * 'a) list vector
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  val atp_problem_weights : string problem -> (string * real) list
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end;
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structure Sledgehammer_ATP_Translate : SLEDGEHAMMER_ATP_TRANSLATE =
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struct
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open ATP_Problem
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open Metis_Translate
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open Sledgehammer_Util
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(* FIXME: Remove references once appropriate defaults have been determined
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   empirically. *)
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val precise_overloaded_args = Unsynchronized.ref false
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val fact_prefix = "fact_"
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val conjecture_prefix = "conj_"
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val helper_prefix = "help_"
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val class_rel_clause_prefix = "clrel_";
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val arity_clause_prefix = "arity_"
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val tfree_prefix = "tfree_"
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(* Freshness almost guaranteed! *)
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val sledgehammer_weak_prefix = "Sledgehammer:"
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type translated_formula =
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  {name: string,
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   kind: kind,
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   combformula: (name, combterm) formula,
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   ctypes_sorts: typ list}
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datatype type_system =
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  Tags of bool |
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  Preds of bool |
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  Const_Args |
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  No_Types
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fun types_dangerous_types (Tags _) = true
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  | types_dangerous_types (Preds _) = true
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  | types_dangerous_types _ = false
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(* This is an approximation. If it returns "true" for a constant that isn't
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   overloaded (i.e., that has one uniform definition), needless clutter is
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   generated; if it returns "false" for an overloaded constant, the ATP gets a
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   license to do unsound reasoning if the type system is "overloaded_args". *)
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fun is_overloaded thy s =
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  not (!precise_overloaded_args) orelse
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  s = @{const_name finite} orelse
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  (s <> @{const_name HOL.eq} andalso
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   length (Defs.specifications_of (Theory.defs_of thy) s) > 1)
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fun needs_type_args thy type_sys s =
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  case type_sys of
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    Tags full_types => not full_types andalso is_overloaded thy s
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  | Preds _ => is_overloaded thy s (* FIXME: could be more precise *)
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  | Const_Args => is_overloaded thy s
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  | No_Types => false
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fun num_atp_type_args thy type_sys s =
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  if needs_type_args thy type_sys s then num_type_args thy s else 0
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fun atp_type_literals_for_types type_sys Ts =
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  if type_sys = No_Types then [] else type_literals_for_types Ts
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fun mk_anot phi = AConn (ANot, [phi])
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fun mk_aconn c phi1 phi2 = AConn (c, [phi1, phi2])
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fun mk_ahorn [] phi = phi
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  | mk_ahorn (phi :: phis) psi =
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    AConn (AImplies, [fold (mk_aconn AAnd) phis phi, psi])
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fun close_universally phi =
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  let
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    fun term_vars bounds (ATerm (name as (s, _), tms)) =
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        (is_atp_variable s andalso not (member (op =) bounds name))
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          ? insert (op =) name
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        #> fold (term_vars bounds) tms
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    fun formula_vars bounds (AQuant (_, xs, phi)) =
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        formula_vars (xs @ bounds) phi
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      | formula_vars bounds (AConn (_, phis)) = fold (formula_vars bounds) phis
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      | formula_vars bounds (AAtom tm) = term_vars bounds tm
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  in
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    case formula_vars [] phi [] of [] => phi | xs => AQuant (AForall, xs, phi)
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  end
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fun combformula_for_prop thy eq_as_iff =
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  let
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    fun do_term bs t ts =
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      combterm_from_term thy bs (Envir.eta_contract t)
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      |>> AAtom ||> union (op =) ts
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    fun do_quant bs q s T t' =
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      let val s = Name.variant (map fst bs) s in
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        do_formula ((s, T) :: bs) t'
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        #>> (fn phi => AQuant (q, [`make_bound_var s], phi))
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      end
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    and do_conn bs c t1 t2 =
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      do_formula bs t1 ##>> do_formula bs t2
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      #>> (fn (phi1, phi2) => AConn (c, [phi1, phi2]))
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    and do_formula bs t =
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      case t of
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        @{const Not} $ t1 =>
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        do_formula bs t1 #>> (fn phi => AConn (ANot, [phi]))
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      | Const (@{const_name All}, _) $ Abs (s, T, t') =>
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        do_quant bs AForall s T t'
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      | Const (@{const_name Ex}, _) $ Abs (s, T, t') =>
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        do_quant bs AExists s T t'
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      | @{const HOL.conj} $ t1 $ t2 => do_conn bs AAnd t1 t2
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      | @{const HOL.disj} $ t1 $ t2 => do_conn bs AOr t1 t2
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      | @{const HOL.implies} $ t1 $ t2 => do_conn bs AImplies t1 t2
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      | Const (@{const_name HOL.eq}, Type (_, [@{typ bool}, _])) $ t1 $ t2 =>
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        if eq_as_iff then do_conn bs AIff t1 t2 else do_term bs t
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      | _ => do_term bs t
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  in do_formula [] end
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val presimplify_term = prop_of o Meson.presimplify oo Skip_Proof.make_thm
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fun concealed_bound_name j = sledgehammer_weak_prefix ^ Int.toString j
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fun conceal_bounds Ts t =
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  subst_bounds (map (Free o apfst concealed_bound_name)
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                    (0 upto length Ts - 1 ~~ Ts), t)
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fun reveal_bounds Ts =
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  subst_atomic (map (fn (j, T) => (Free (concealed_bound_name j, T), Bound j))
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                    (0 upto length Ts - 1 ~~ Ts))
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(* Removes the lambdas from an equation of the form "t = (%x. u)".
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   (Cf. "extensionalize_theorem" in "Meson_Clausify".) *)
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fun extensionalize_term t =
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  let
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    fun aux j (@{const Trueprop} $ t') = @{const Trueprop} $ aux j t'
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      | aux j (t as Const (s, Type (_, [Type (_, [_, T']),
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                                        Type (_, [_, res_T])]))
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                    $ t2 $ Abs (var_s, var_T, t')) =
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        if s = @{const_name HOL.eq} orelse s = @{const_name "=="} then
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          let val var_t = Var ((var_s, j), var_T) in
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            Const (s, T' --> T' --> res_T)
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              $ betapply (t2, var_t) $ subst_bound (var_t, t')
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            |> aux (j + 1)
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          end
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        else
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          t
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      | aux _ t = t
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  in aux (maxidx_of_term t + 1) t end
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fun introduce_combinators_in_term ctxt kind t =
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  let val thy = ProofContext.theory_of ctxt in
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    if Meson.is_fol_term thy t then
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      t
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    else
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      let
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        fun aux Ts t =
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          case t of
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            @{const Not} $ t1 => @{const Not} $ aux Ts t1
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          | (t0 as Const (@{const_name All}, _)) $ Abs (s, T, t') =>
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            t0 $ Abs (s, T, aux (T :: Ts) t')
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          | (t0 as Const (@{const_name All}, _)) $ t1 =>
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            aux Ts (t0 $ eta_expand Ts t1 1)
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          | (t0 as Const (@{const_name Ex}, _)) $ Abs (s, T, t') =>
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            t0 $ Abs (s, T, aux (T :: Ts) t')
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          | (t0 as Const (@{const_name Ex}, _)) $ t1 =>
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            aux Ts (t0 $ eta_expand Ts t1 1)
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          | (t0 as @{const HOL.conj}) $ t1 $ t2 => t0 $ aux Ts t1 $ aux Ts t2
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          | (t0 as @{const HOL.disj}) $ t1 $ t2 => t0 $ aux Ts t1 $ aux Ts t2
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          | (t0 as @{const HOL.implies}) $ t1 $ t2 => t0 $ aux Ts t1 $ aux Ts t2
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          | (t0 as Const (@{const_name HOL.eq}, Type (_, [@{typ bool}, _])))
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              $ t1 $ t2 =>
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            t0 $ aux Ts t1 $ aux Ts t2
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          | _ => if not (exists_subterm (fn Abs _ => true | _ => false) t) then
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                   t
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                 else
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                   t |> conceal_bounds Ts
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                     |> Envir.eta_contract
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                     |> cterm_of thy
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                     |> Meson_Clausify.introduce_combinators_in_cterm
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                     |> prop_of |> Logic.dest_equals |> snd
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                     |> reveal_bounds Ts
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        val (t, ctxt') = Variable.import_terms true [t] ctxt |>> the_single
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      in t |> aux [] |> singleton (Variable.export_terms ctxt' ctxt) end
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      handle THM _ =>
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             (* A type variable of sort "{}" will make abstraction fail. *)
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             if kind = Conjecture then HOLogic.false_const
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             else HOLogic.true_const
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  end
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(* Metis's use of "resolve_tac" freezes the schematic variables. We simulate the
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   same in Sledgehammer to prevent the discovery of unreplable proofs. *)
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fun freeze_term t =
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  let
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    fun aux (t $ u) = aux t $ aux u
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      | aux (Abs (s, T, t)) = Abs (s, T, aux t)
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      | aux (Var ((s, i), T)) =
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        Free (sledgehammer_weak_prefix ^ s ^ "_" ^ string_of_int i, T)
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      | aux t = t
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  in t |> exists_subterm is_Var t ? aux end
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(* making fact and conjecture formulas *)
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fun make_formula ctxt eq_as_iff presimp name kind t =
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  let
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    val thy = ProofContext.theory_of ctxt
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    val t = t |> Envir.beta_eta_contract
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              |> transform_elim_term
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              |> Object_Logic.atomize_term thy
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    val need_trueprop = (fastype_of t = HOLogic.boolT)
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    val t = t |> need_trueprop ? HOLogic.mk_Trueprop
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              |> extensionalize_term
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              |> presimp ? presimplify_term thy
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              |> perhaps (try (HOLogic.dest_Trueprop))
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              |> introduce_combinators_in_term ctxt kind
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              |> kind <> Axiom ? freeze_term
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    val (combformula, ctypes_sorts) = combformula_for_prop thy eq_as_iff t []
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  in
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    {name = name, combformula = combformula, kind = kind,
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     ctypes_sorts = ctypes_sorts}
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  end
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fun make_fact ctxt eq_as_iff presimp ((name, _), th) =
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  case make_formula ctxt eq_as_iff presimp name Axiom (prop_of th) of
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    {combformula = AAtom (CombConst (("c_True", _), _, _)), ...} => NONE
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  | formula => SOME formula
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fun make_conjecture ctxt ts =
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  let val last = length ts - 1 in
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    map2 (fn j => make_formula ctxt true true (Int.toString j)
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                               (if j = last then Conjecture else Hypothesis))
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         (0 upto last) ts
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  end
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(** Helper facts **)
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fun fold_formula f (AQuant (_, _, phi)) = fold_formula f phi
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  | fold_formula f (AConn (_, phis)) = fold (fold_formula f) phis
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  | fold_formula f (AAtom tm) = f tm
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fun count_term (ATerm ((s, _), tms)) =
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  (if is_atp_variable s then I
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   else Symtab.map_entry s (Integer.add 1))
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  #> fold count_term tms
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fun count_formula x = fold_formula count_term x
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val init_counters =
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  metis_helpers |> map fst |> sort_distinct string_ord |> map (rpair 0)
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  |> Symtab.make
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fun get_helper_facts ctxt explicit_forall type_sys formulas =
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  let
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    val no_dangerous_types = types_dangerous_types type_sys
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    val ct = init_counters |> fold count_formula formulas
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    fun is_used s = the (Symtab.lookup ct s) > 0
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    fun dub c needs_full_types (th, j) =
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      ((c ^ "_" ^ string_of_int j ^ (if needs_full_types then "ft" else ""),
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        false), th)
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    fun make_facts eq_as_iff = map_filter (make_fact ctxt eq_as_iff false)
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  in
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    (metis_helpers
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     |> filter (is_used o fst)
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     |> maps (fn (c, (needs_full_types, ths)) =>
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                 if needs_full_types andalso not no_dangerous_types then
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                   []
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                 else
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                   ths ~~ (1 upto length ths)
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                   |> map (dub c needs_full_types)
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                   |> make_facts (not needs_full_types)),
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     if type_sys = Tags false then
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       let
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         fun var s = ATerm (`I s, [])
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         fun tag tm = ATerm (`I type_tag_name, [var "X", tm])
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       in
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         [Fof (helper_prefix ^ ascii_of "ti_ti", Axiom,
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               AAtom (ATerm (`I "equal", [tag (tag (var "Y")), tag (var "Y")]))
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               |> explicit_forall ? close_universally)]
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       end
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     else
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       [])
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  end
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fun translate_atp_fact ctxt = `(make_fact ctxt true true)
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fun translate_formulas ctxt type_sys hyp_ts concl_t rich_facts =
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  let
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    val thy = ProofContext.theory_of ctxt
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    val fact_ts = map (prop_of o snd o snd) rich_facts
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    val (facts, fact_names) =
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      rich_facts
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      |> map_filter (fn (NONE, _) => NONE
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                      | (SOME fact, (name, _)) => SOME (fact, name))
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      |> ListPair.unzip
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    (* Remove existing facts from the conjecture, as this can dramatically
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       boost an ATP's performance (for some reason). *)
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    val hyp_ts = hyp_ts |> filter_out (member (op aconv) fact_ts)
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    val goal_t = Logic.list_implies (hyp_ts, concl_t)
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    val subs = tfree_classes_of_terms [goal_t]
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    val supers = tvar_classes_of_terms fact_ts
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    val tycons = type_consts_of_terms thy (goal_t :: fact_ts)
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    (* TFrees in the conjecture; TVars in the facts *)
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    val conjs = make_conjecture ctxt (hyp_ts @ [concl_t])
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    val (supers', arity_clauses) =
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      if type_sys = No_Types then ([], [])
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      else make_arity_clauses thy tycons supers
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    val class_rel_clauses = make_class_rel_clauses thy subs supers'
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  in
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    (fact_names |> map single, (conjs, facts, class_rel_clauses, arity_clauses))
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  end
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fun tag_with_type ty t = ATerm (`I type_tag_name, [ty, t])
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fun fo_term_for_combtyp (CombTVar name) = ATerm (name, [])
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  | fo_term_for_combtyp (CombTFree name) = ATerm (name, [])
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  | fo_term_for_combtyp (CombType (name, tys)) =
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    ATerm (name, map fo_term_for_combtyp tys)
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fun fo_literal_for_type_literal (TyLitVar (class, name)) =
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    (true, ATerm (class, [ATerm (name, [])]))
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  | fo_literal_for_type_literal (TyLitFree (class, name)) =
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    (true, ATerm (class, [ATerm (name, [])]))
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fun formula_for_fo_literal (pos, t) = AAtom t |> not pos ? mk_anot
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(* Finite types such as "unit", "bool", "bool * bool", and "bool => bool" are
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   considered dangerous because their "exhaust" properties can easily lead to
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   unsound ATP proofs. The checks below are an (unsound) approximation of
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   finiteness. *)
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fun is_dtyp_dangerous _ (Datatype_Aux.DtTFree _) = true
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  | is_dtyp_dangerous ctxt (Datatype_Aux.DtType (s, Us)) =
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    is_type_constr_dangerous ctxt s andalso forall (is_dtyp_dangerous ctxt) Us
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  | is_dtyp_dangerous _ (Datatype_Aux.DtRec _) = false
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and is_type_dangerous ctxt (Type (s, Ts)) =
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    is_type_constr_dangerous ctxt s andalso forall (is_type_dangerous ctxt) Ts
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  | is_type_dangerous _ _ = false
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and is_type_constr_dangerous ctxt s =
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  let val thy = ProofContext.theory_of ctxt in
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    case Datatype_Data.get_info thy s of
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      SOME {descr, ...} =>
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      forall (fn (_, (_, _, constrs)) =>
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                 forall (forall (is_dtyp_dangerous ctxt) o snd) constrs) descr
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    | NONE =>
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      case Typedef.get_info ctxt s of
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        ({rep_type, ...}, _) :: _ => is_type_dangerous ctxt rep_type
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      | [] => true
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  end
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fun is_combtyp_dangerous ctxt (CombType ((s, _), tys)) =
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    (case strip_prefix_and_unascii type_const_prefix s of
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       SOME s' => forall (is_combtyp_dangerous ctxt) tys andalso
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                  is_type_constr_dangerous ctxt (invert_const s')
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     | NONE => false)
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  | is_combtyp_dangerous _ _ = false
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fun should_tag_with_type ctxt (Tags full_types) ty =
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    full_types orelse is_combtyp_dangerous ctxt ty
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  | should_tag_with_type _ _ _ = false
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val fname_table =
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  [("c_False", (0, ("c_fFalse", @{const_name Metis.fFalse}))),
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   ("c_True", (0, ("c_fTrue", @{const_name Metis.fTrue}))),
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
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parents: 41138
diff changeset
   383
   ("c_Not", (1, ("c_fNot", @{const_name Metis.fNot}))),
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
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parents: 41138
diff changeset
   384
   ("c_conj", (2, ("c_fconj", @{const_name Metis.fconj}))),
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
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parents: 41138
diff changeset
   385
   ("c_disj", (2, ("c_fdisj", @{const_name Metis.fdisj}))),
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
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parents: 41138
diff changeset
   386
   ("c_implies", (2, ("c_fimplies", @{const_name Metis.fimplies}))),
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
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parents: 41138
diff changeset
   387
   ("equal", (2, ("c_fequal", @{const_name Metis.fequal})))]
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
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parents: 41138
diff changeset
   388
41138
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parents: 41137
diff changeset
   389
fun fo_term_for_combterm ctxt type_sys =
38282
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parents:
diff changeset
   390
  let
41138
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parents: 41137
diff changeset
   391
    val thy = ProofContext.theory_of ctxt
38282
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parents:
diff changeset
   392
    fun aux top_level u =
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
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parents:
diff changeset
   393
      let
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
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parents:
diff changeset
   394
        val (head, args) = strip_combterm_comb u
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
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parents:
diff changeset
   395
        val (x, ty_args) =
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
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parents:
diff changeset
   396
          case head of
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
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parents:
diff changeset
   397
            CombConst (name as (s, s'), _, ty_args) =>
41140
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
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parents: 41138
diff changeset
   398
            (case AList.lookup (op =) fname_table s of
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
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parents: 41138
diff changeset
   399
               SOME (n, fname) =>
41150
54b3c9c05664 make sure first-order occurrences of "False" and "True" are handled correctly -- this broke when adding proper support for higher-order occurrences
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parents: 41149
diff changeset
   400
               (if top_level andalso length args = n then
54b3c9c05664 make sure first-order occurrences of "False" and "True" are handled correctly -- this broke when adding proper support for higher-order occurrences
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parents: 41149
diff changeset
   401
                  case s of
54b3c9c05664 make sure first-order occurrences of "False" and "True" are handled correctly -- this broke when adding proper support for higher-order occurrences
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parents: 41149
diff changeset
   402
                    "c_False" => ("$false", s')
54b3c9c05664 make sure first-order occurrences of "False" and "True" are handled correctly -- this broke when adding proper support for higher-order occurrences
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parents: 41149
diff changeset
   403
                  | "c_True" => ("$true", s')
54b3c9c05664 make sure first-order occurrences of "False" and "True" are handled correctly -- this broke when adding proper support for higher-order occurrences
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parents: 41149
diff changeset
   404
                  | _ => name
54b3c9c05664 make sure first-order occurrences of "False" and "True" are handled correctly -- this broke when adding proper support for higher-order occurrences
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parents: 41149
diff changeset
   405
                else
54b3c9c05664 make sure first-order occurrences of "False" and "True" are handled correctly -- this broke when adding proper support for higher-order occurrences
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parents: 41149
diff changeset
   406
                  fname, [])
41140
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
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parents: 41138
diff changeset
   407
             | NONE =>
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
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parents: 41138
diff changeset
   408
               case strip_prefix_and_unascii const_prefix s of
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
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parents: 41138
diff changeset
   409
                 NONE => (name, ty_args)
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
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parents: 41138
diff changeset
   410
               | SOME s'' =>
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
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parents: 41138
diff changeset
   411
                 let
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
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parents: 41138
diff changeset
   412
                   val s'' = invert_const s''
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
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parents: 41138
diff changeset
   413
                   val ty_args =
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
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parents: 41138
diff changeset
   414
                     if needs_type_args thy type_sys s'' then ty_args else []
41150
54b3c9c05664 make sure first-order occurrences of "False" and "True" are handled correctly -- this broke when adding proper support for higher-order occurrences
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parents: 41149
diff changeset
   415
                  in (name, ty_args) end)
38282
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parents:
diff changeset
   416
          | CombVar (name, _) => (name, [])
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
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parents:
diff changeset
   417
          | CombApp _ => raise Fail "impossible \"CombApp\""
41138
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diff changeset
   418
        val t =
eb80538166b6 implemented partially-typed "tags" type encoding
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diff changeset
   419
          ATerm (x, map fo_term_for_combtyp ty_args @ map (aux false) args)
eb80538166b6 implemented partially-typed "tags" type encoding
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diff changeset
   420
        val ty = combtyp_of u
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
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parents:
diff changeset
   421
    in
41138
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parents: 41137
diff changeset
   422
      t |> (if should_tag_with_type ctxt type_sys ty then
eb80538166b6 implemented partially-typed "tags" type encoding
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parents: 41137
diff changeset
   423
              tag_with_type (fo_term_for_combtyp ty)
41134
de9e0adc21da added "type_sys" option to Sledgehammer
blanchet
parents: 41091
diff changeset
   424
            else
de9e0adc21da added "type_sys" option to Sledgehammer
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parents: 41091
diff changeset
   425
              I)
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
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parents:
diff changeset
   426
    end
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
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parents:
diff changeset
   427
  in aux true end
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   428
41138
eb80538166b6 implemented partially-typed "tags" type encoding
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parents: 41137
diff changeset
   429
fun formula_for_combformula ctxt type_sys =
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
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parents:
diff changeset
   430
  let
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   431
    fun aux (AQuant (q, xs, phi)) = AQuant (q, xs, aux phi)
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
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parents:
diff changeset
   432
      | aux (AConn (c, phis)) = AConn (c, map aux phis)
41138
eb80538166b6 implemented partially-typed "tags" type encoding
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parents: 41137
diff changeset
   433
      | aux (AAtom tm) = AAtom (fo_term_for_combterm ctxt type_sys tm)
38282
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parents:
diff changeset
   434
  in aux end
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
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parents:
diff changeset
   435
41138
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parents: 41137
diff changeset
   436
fun formula_for_fact ctxt type_sys
40204
da97d75e20e6 standardize on "fact" terminology (vs. "axiom" or "theorem") in Sledgehammer -- but keep "Axiom" in the lower-level "ATP_Problem" module
blanchet
parents: 40145
diff changeset
   437
                     ({combformula, ctypes_sorts, ...} : translated_formula) =
38282
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parents:
diff changeset
   438
  mk_ahorn (map (formula_for_fo_literal o fo_literal_for_type_literal)
41137
8b634031b2a5 implemented "no_types" encoding, which is too unsound to be useful but can come in handy for evaluations
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parents: 41136
diff changeset
   439
                (atp_type_literals_for_types type_sys ctypes_sorts))
41138
eb80538166b6 implemented partially-typed "tags" type encoding
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parents: 41137
diff changeset
   440
           (formula_for_combformula ctxt type_sys combformula)
38282
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parents:
diff changeset
   441
41138
eb80538166b6 implemented partially-typed "tags" type encoding
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parents: 41137
diff changeset
   442
fun problem_line_for_fact ctxt prefix type_sys (formula as {name, kind, ...}) =
eb80538166b6 implemented partially-typed "tags" type encoding
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parents: 41137
diff changeset
   443
  Fof (prefix ^ ascii_of name, kind, formula_for_fact ctxt type_sys formula)
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   444
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   445
fun problem_line_for_class_rel_clause (ClassRelClause {name, subclass,
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   446
                                                       superclass, ...}) =
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   447
  let val ty_arg = ATerm (("T", "T"), []) in
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   448
    Fof (class_rel_clause_prefix ^ ascii_of name, Axiom,
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   449
         AConn (AImplies, [AAtom (ATerm (subclass, [ty_arg])),
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   450
                           AAtom (ATerm (superclass, [ty_arg]))]))
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
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parents:
diff changeset
   451
  end
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   452
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   453
fun fo_literal_for_arity_literal (TConsLit (c, t, args)) =
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   454
    (true, ATerm (c, [ATerm (t, map (fn arg => ATerm (arg, [])) args)]))
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   455
  | fo_literal_for_arity_literal (TVarLit (c, sort)) =
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   456
    (false, ATerm (c, [ATerm (sort, [])]))
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   457
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   458
fun problem_line_for_arity_clause (ArityClause {name, conclLit, premLits,
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   459
                                                ...}) =
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   460
  Fof (arity_clause_prefix ^ ascii_of name, Axiom,
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   461
       mk_ahorn (map (formula_for_fo_literal o apfst not
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   462
                      o fo_literal_for_arity_literal) premLits)
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   463
                (formula_for_fo_literal
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   464
                     (fo_literal_for_arity_literal conclLit)))
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   465
41138
eb80538166b6 implemented partially-typed "tags" type encoding
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parents: 41137
diff changeset
   466
fun problem_line_for_conjecture ctxt type_sys
40114
blanchet
parents: 40069
diff changeset
   467
        ({name, kind, combformula, ...} : translated_formula) =
38282
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blanchet
parents:
diff changeset
   468
  Fof (conjecture_prefix ^ name, kind,
41138
eb80538166b6 implemented partially-typed "tags" type encoding
blanchet
parents: 41137
diff changeset
   469
       formula_for_combformula ctxt type_sys combformula)
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   470
41137
8b634031b2a5 implemented "no_types" encoding, which is too unsound to be useful but can come in handy for evaluations
blanchet
parents: 41136
diff changeset
   471
fun free_type_literals_for_conjecture type_sys
40114
blanchet
parents: 40069
diff changeset
   472
        ({ctypes_sorts, ...} : translated_formula) =
41137
8b634031b2a5 implemented "no_types" encoding, which is too unsound to be useful but can come in handy for evaluations
blanchet
parents: 41136
diff changeset
   473
  ctypes_sorts |> atp_type_literals_for_types type_sys
8b634031b2a5 implemented "no_types" encoding, which is too unsound to be useful but can come in handy for evaluations
blanchet
parents: 41136
diff changeset
   474
               |> map fo_literal_for_type_literal
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   475
39975
7c50d5ca5c04 avoid generating several formulas with the same name ("tfrees")
blanchet
parents: 39954
diff changeset
   476
fun problem_line_for_free_type j lit =
7c50d5ca5c04 avoid generating several formulas with the same name ("tfrees")
blanchet
parents: 39954
diff changeset
   477
  Fof (tfree_prefix ^ string_of_int j, Hypothesis, formula_for_fo_literal lit)
41313
a96ac4d180b7 optionally supply constant weights to E -- turned off by default until properly parameterized
blanchet
parents: 41211
diff changeset
   478
fun problem_lines_for_free_types type_sys conjs =
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   479
  let
41313
a96ac4d180b7 optionally supply constant weights to E -- turned off by default until properly parameterized
blanchet
parents: 41211
diff changeset
   480
    val litss = map (free_type_literals_for_conjecture type_sys) conjs
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   481
    val lits = fold (union (op =)) litss []
39975
7c50d5ca5c04 avoid generating several formulas with the same name ("tfrees")
blanchet
parents: 39954
diff changeset
   482
  in map2 problem_line_for_free_type (0 upto length lits - 1) lits end
38282
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blanchet
parents:
diff changeset
   483
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   484
(** "hBOOL" and "hAPP" **)
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   485
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   486
type const_info = {min_arity: int, max_arity: int, sub_level: bool}
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   487
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   488
fun consider_term top_level (ATerm ((s, _), ts)) =
39452
70a57e40f795 factored out TSTP/SPASS/Vampire proof parsing;
blanchet
parents: 39370
diff changeset
   489
  (if is_atp_variable s then
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   490
     I
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   491
   else
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   492
     let val n = length ts in
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   493
       Symtab.map_default
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   494
           (s, {min_arity = n, max_arity = 0, sub_level = false})
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   495
           (fn {min_arity, max_arity, sub_level} =>
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   496
               {min_arity = Int.min (n, min_arity),
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   497
                max_arity = Int.max (n, max_arity),
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   498
                sub_level = sub_level orelse not top_level})
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   499
     end)
41138
eb80538166b6 implemented partially-typed "tags" type encoding
blanchet
parents: 41137
diff changeset
   500
  #> fold (consider_term (top_level andalso s = type_tag_name)) ts
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   501
fun consider_formula (AQuant (_, _, phi)) = consider_formula phi
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   502
  | consider_formula (AConn (_, phis)) = fold consider_formula phis
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   503
  | consider_formula (AAtom tm) = consider_term true tm
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   504
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   505
fun consider_problem_line (Fof (_, _, phi)) = consider_formula phi
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   506
fun consider_problem problem = fold (fold consider_problem_line o snd) problem
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   507
41140
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
blanchet
parents: 41138
diff changeset
   508
(* needed for helper facts if the problem otherwise does not involve equality *)
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
blanchet
parents: 41138
diff changeset
   509
val equal_entry = ("equal", {min_arity = 2, max_arity = 2, sub_level = false})
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
blanchet
parents: 41138
diff changeset
   510
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   511
fun const_table_for_problem explicit_apply problem =
41140
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
blanchet
parents: 41138
diff changeset
   512
  if explicit_apply then
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
blanchet
parents: 41138
diff changeset
   513
    NONE
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
blanchet
parents: 41138
diff changeset
   514
  else
41147
0e1903273712 fix translation of higher-order equality ("fequal") if "precise_overloaded_args" is "true"
blanchet
parents: 41145
diff changeset
   515
    SOME (Symtab.empty |> Symtab.default equal_entry |> consider_problem problem)
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   516
41134
de9e0adc21da added "type_sys" option to Sledgehammer
blanchet
parents: 41091
diff changeset
   517
fun min_arity_of thy type_sys NONE s =
41138
eb80538166b6 implemented partially-typed "tags" type encoding
blanchet
parents: 41137
diff changeset
   518
    (if s = "equal" orelse s = type_tag_name orelse
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   519
        String.isPrefix type_const_prefix s orelse
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   520
        String.isPrefix class_prefix s then
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   521
       16383 (* large number *)
38748
69fea359d3f8 renaming
blanchet
parents: 38698
diff changeset
   522
     else case strip_prefix_and_unascii const_prefix s of
41136
30bedf58b177 implemented new type system encoding "overload_args", which is more lightweight than "const_args" (the unsound default) and hopefully almost as sound
blanchet
parents: 41134
diff changeset
   523
       SOME s' => num_atp_type_args thy type_sys (invert_const s')
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   524
     | NONE => 0)
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   525
  | min_arity_of _ _ (SOME the_const_tab) s =
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   526
    case Symtab.lookup the_const_tab s of
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   527
      SOME ({min_arity, ...} : const_info) => min_arity
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   528
    | NONE => 0
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   529
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   530
fun full_type_of (ATerm ((s, _), [ty, _])) =
41138
eb80538166b6 implemented partially-typed "tags" type encoding
blanchet
parents: 41137
diff changeset
   531
    if s = type_tag_name then SOME ty else NONE
eb80538166b6 implemented partially-typed "tags" type encoding
blanchet
parents: 41137
diff changeset
   532
  | full_type_of _ = NONE
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   533
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   534
fun list_hAPP_rev _ t1 [] = t1
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   535
  | list_hAPP_rev NONE t1 (t2 :: ts2) =
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   536
    ATerm (`I "hAPP", [list_hAPP_rev NONE t1 ts2, t2])
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   537
  | list_hAPP_rev (SOME ty) t1 (t2 :: ts2) =
41138
eb80538166b6 implemented partially-typed "tags" type encoding
blanchet
parents: 41137
diff changeset
   538
    case full_type_of t2 of
eb80538166b6 implemented partially-typed "tags" type encoding
blanchet
parents: 41137
diff changeset
   539
      SOME ty2 =>
eb80538166b6 implemented partially-typed "tags" type encoding
blanchet
parents: 41137
diff changeset
   540
      let val ty' = ATerm (`make_fixed_type_const @{type_name fun},
eb80538166b6 implemented partially-typed "tags" type encoding
blanchet
parents: 41137
diff changeset
   541
                           [ty2, ty]) in
eb80538166b6 implemented partially-typed "tags" type encoding
blanchet
parents: 41137
diff changeset
   542
        ATerm (`I "hAPP",
eb80538166b6 implemented partially-typed "tags" type encoding
blanchet
parents: 41137
diff changeset
   543
               [tag_with_type ty' (list_hAPP_rev (SOME ty') t1 ts2), t2])
eb80538166b6 implemented partially-typed "tags" type encoding
blanchet
parents: 41137
diff changeset
   544
      end
eb80538166b6 implemented partially-typed "tags" type encoding
blanchet
parents: 41137
diff changeset
   545
    | NONE => list_hAPP_rev NONE t1 (t2 :: ts2)
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   546
41134
de9e0adc21da added "type_sys" option to Sledgehammer
blanchet
parents: 41091
diff changeset
   547
fun repair_applications_in_term thy type_sys const_tab =
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   548
  let
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   549
    fun aux opt_ty (ATerm (name as (s, _), ts)) =
41138
eb80538166b6 implemented partially-typed "tags" type encoding
blanchet
parents: 41137
diff changeset
   550
      if s = type_tag_name then
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   551
        case ts of
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   552
          [t1, t2] => ATerm (name, [aux NONE t1, aux (SOME t1) t2])
41138
eb80538166b6 implemented partially-typed "tags" type encoding
blanchet
parents: 41137
diff changeset
   553
        | _ => raise Fail "malformed type tag"
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   554
      else
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   555
        let
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   556
          val ts = map (aux NONE) ts
41134
de9e0adc21da added "type_sys" option to Sledgehammer
blanchet
parents: 41091
diff changeset
   557
          val (ts1, ts2) = chop (min_arity_of thy type_sys const_tab s) ts
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   558
        in list_hAPP_rev opt_ty (ATerm (name, ts1)) (rev ts2) end
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   559
  in aux NONE end
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   560
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   561
fun boolify t = ATerm (`I "hBOOL", [t])
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   562
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   563
(* True if the constant ever appears outside of the top-level position in
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   564
   literals, or if it appears with different arities (e.g., because of different
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   565
   type instantiations). If false, the constant always receives all of its
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   566
   arguments and is used as a predicate. *)
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   567
fun is_predicate NONE s =
38589
b03f8fe043ec added "max_relevant_per_iter" option to Sledgehammer
blanchet
parents: 38518
diff changeset
   568
    s = "equal" orelse s = "$false" orelse s = "$true" orelse
b03f8fe043ec added "max_relevant_per_iter" option to Sledgehammer
blanchet
parents: 38518
diff changeset
   569
    String.isPrefix type_const_prefix s orelse String.isPrefix class_prefix s
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   570
  | is_predicate (SOME the_const_tab) s =
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   571
    case Symtab.lookup the_const_tab s of
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   572
      SOME {min_arity, max_arity, sub_level} =>
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   573
      not sub_level andalso min_arity = max_arity
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   574
    | NONE => false
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   575
41140
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
blanchet
parents: 41138
diff changeset
   576
fun repair_predicates_in_term pred_const_tab (t as ATerm ((s, _), ts)) =
41138
eb80538166b6 implemented partially-typed "tags" type encoding
blanchet
parents: 41137
diff changeset
   577
  if s = type_tag_name then
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   578
    case ts of
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   579
      [_, t' as ATerm ((s', _), _)] =>
41140
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
blanchet
parents: 41138
diff changeset
   580
      if is_predicate pred_const_tab s' then t' else boolify t
41138
eb80538166b6 implemented partially-typed "tags" type encoding
blanchet
parents: 41137
diff changeset
   581
    | _ => raise Fail "malformed type tag"
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   582
  else
41140
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
blanchet
parents: 41138
diff changeset
   583
    t |> not (is_predicate pred_const_tab s) ? boolify
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   584
41134
de9e0adc21da added "type_sys" option to Sledgehammer
blanchet
parents: 41091
diff changeset
   585
fun repair_formula thy explicit_forall type_sys const_tab =
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   586
  let
41140
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
blanchet
parents: 41138
diff changeset
   587
    val pred_const_tab = case type_sys of Tags _ => NONE | _ => const_tab
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   588
    fun aux (AQuant (q, xs, phi)) = AQuant (q, xs, aux phi)
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   589
      | aux (AConn (c, phis)) = AConn (c, map aux phis)
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   590
      | aux (AAtom tm) =
41134
de9e0adc21da added "type_sys" option to Sledgehammer
blanchet
parents: 41091
diff changeset
   591
        AAtom (tm |> repair_applications_in_term thy type_sys const_tab
41140
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
blanchet
parents: 41138
diff changeset
   592
                  |> repair_predicates_in_term pred_const_tab)
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   593
  in aux #> explicit_forall ? close_universally end
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   594
41134
de9e0adc21da added "type_sys" option to Sledgehammer
blanchet
parents: 41091
diff changeset
   595
fun repair_problem_line thy explicit_forall type_sys const_tab
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   596
                        (Fof (ident, kind, phi)) =
41134
de9e0adc21da added "type_sys" option to Sledgehammer
blanchet
parents: 41091
diff changeset
   597
  Fof (ident, kind, repair_formula thy explicit_forall type_sys const_tab phi)
41140
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
blanchet
parents: 41138
diff changeset
   598
fun repair_problem thy = map o apsnd o map ooo repair_problem_line thy
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   599
41140
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
blanchet
parents: 41138
diff changeset
   600
fun dest_Fof (Fof z) = z
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   601
41157
blanchet
parents: 41150
diff changeset
   602
val factsN = "Relevant facts"
blanchet
parents: 41150
diff changeset
   603
val class_relsN = "Class relationships"
blanchet
parents: 41150
diff changeset
   604
val aritiesN = "Arity declarations"
blanchet
parents: 41150
diff changeset
   605
val helpersN = "Helper facts"
blanchet
parents: 41150
diff changeset
   606
val conjsN = "Conjectures"
41313
a96ac4d180b7 optionally supply constant weights to E -- turned off by default until properly parameterized
blanchet
parents: 41211
diff changeset
   607
val free_typesN = "Type variables"
41157
blanchet
parents: 41150
diff changeset
   608
blanchet
parents: 41150
diff changeset
   609
fun offset_of_heading_in_problem _ [] j = j
blanchet
parents: 41150
diff changeset
   610
  | offset_of_heading_in_problem needle ((heading, lines) :: problem) j =
blanchet
parents: 41150
diff changeset
   611
    if heading = needle then j
blanchet
parents: 41150
diff changeset
   612
    else offset_of_heading_in_problem needle problem (j + length lines)
blanchet
parents: 41150
diff changeset
   613
41134
de9e0adc21da added "type_sys" option to Sledgehammer
blanchet
parents: 41091
diff changeset
   614
fun prepare_atp_problem ctxt readable_names explicit_forall type_sys
40204
da97d75e20e6 standardize on "fact" terminology (vs. "axiom" or "theorem") in Sledgehammer -- but keep "Axiom" in the lower-level "ATP_Problem" module
blanchet
parents: 40145
diff changeset
   615
                        explicit_apply hyp_ts concl_t facts =
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   616
  let
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   617
    val thy = ProofContext.theory_of ctxt
41313
a96ac4d180b7 optionally supply constant weights to E -- turned off by default until properly parameterized
blanchet
parents: 41211
diff changeset
   618
    val (fact_names, (conjs, facts, class_rel_clauses, arity_clauses)) =
41134
de9e0adc21da added "type_sys" option to Sledgehammer
blanchet
parents: 41091
diff changeset
   619
      translate_formulas ctxt type_sys hyp_ts concl_t facts
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   620
    (* Reordering these might or might not confuse the proof reconstruction
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   621
       code or the SPASS Flotter hack. *)
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   622
    val problem =
41157
blanchet
parents: 41150
diff changeset
   623
      [(factsN, map (problem_line_for_fact ctxt fact_prefix type_sys) facts),
blanchet
parents: 41150
diff changeset
   624
       (class_relsN, map problem_line_for_class_rel_clause class_rel_clauses),
blanchet
parents: 41150
diff changeset
   625
       (aritiesN, map problem_line_for_arity_clause arity_clauses),
blanchet
parents: 41150
diff changeset
   626
       (helpersN, []),
41313
a96ac4d180b7 optionally supply constant weights to E -- turned off by default until properly parameterized
blanchet
parents: 41211
diff changeset
   627
       (conjsN, map (problem_line_for_conjecture ctxt type_sys) conjs),
a96ac4d180b7 optionally supply constant weights to E -- turned off by default until properly parameterized
blanchet
parents: 41211
diff changeset
   628
       (free_typesN, problem_lines_for_free_types type_sys conjs)]
41140
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
blanchet
parents: 41138
diff changeset
   629
    val const_tab = const_table_for_problem explicit_apply problem
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
blanchet
parents: 41138
diff changeset
   630
    val problem =
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
blanchet
parents: 41138
diff changeset
   631
      problem |> repair_problem thy explicit_forall type_sys const_tab
41157
blanchet
parents: 41150
diff changeset
   632
    val helper_lines =
41145
a5ee3b8e5a90 improve partially tagged encoding by adding a helper fact that coalesces consecutive "ti" tags
blanchet
parents: 41140
diff changeset
   633
      get_helper_facts ctxt explicit_forall type_sys
a5ee3b8e5a90 improve partially tagged encoding by adding a helper fact that coalesces consecutive "ti" tags
blanchet
parents: 41140
diff changeset
   634
                       (maps (map (#3 o dest_Fof) o snd) problem)
41157
blanchet
parents: 41150
diff changeset
   635
      |>> map (problem_line_for_fact ctxt helper_prefix type_sys
blanchet
parents: 41150
diff changeset
   636
               #> repair_problem_line thy explicit_forall type_sys const_tab)
blanchet
parents: 41150
diff changeset
   637
      |> op @
41140
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
blanchet
parents: 41138
diff changeset
   638
    val (problem, pool) =
41157
blanchet
parents: 41150
diff changeset
   639
      problem |> AList.update (op =) (helpersN, helper_lines)
41140
9c68004b8c9d added Sledgehammer support for higher-order propositional reasoning
blanchet
parents: 41138
diff changeset
   640
              |> nice_atp_problem readable_names
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   641
  in
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   642
    (problem,
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   643
     case pool of SOME the_pool => snd the_pool | NONE => Symtab.empty,
41157
blanchet
parents: 41150
diff changeset
   644
     offset_of_heading_in_problem conjsN problem 0,
blanchet
parents: 41150
diff changeset
   645
     fact_names |> Vector.fromList)
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   646
  end
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
blanchet
parents:
diff changeset
   647
41313
a96ac4d180b7 optionally supply constant weights to E -- turned off by default until properly parameterized
blanchet
parents: 41211
diff changeset
   648
(* FUDGE *)
a96ac4d180b7 optionally supply constant weights to E -- turned off by default until properly parameterized
blanchet
parents: 41211
diff changeset
   649
val conj_weight = 0.0
a96ac4d180b7 optionally supply constant weights to E -- turned off by default until properly parameterized
blanchet
parents: 41211
diff changeset
   650
val hyp_weight = 0.05
a96ac4d180b7 optionally supply constant weights to E -- turned off by default until properly parameterized
blanchet
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   651
val fact_min_weight = 0.1
a96ac4d180b7 optionally supply constant weights to E -- turned off by default until properly parameterized
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   652
val fact_max_weight = 1.0
a96ac4d180b7 optionally supply constant weights to E -- turned off by default until properly parameterized
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   653
a96ac4d180b7 optionally supply constant weights to E -- turned off by default until properly parameterized
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   654
fun add_term_weights weight (ATerm (s, tms)) =
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   655
  (not (is_atp_variable s) andalso s <> "equal") ? Symtab.default (s, weight)
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  #> fold (add_term_weights weight) tms
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   657
fun add_problem_line_weights weight (Fof (_, _, phi)) =
41384
c4488b7cbe3b made SML/NJ happy
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  fold_formula (add_term_weights weight) phi
41313
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diff changeset
   659
a96ac4d180b7 optionally supply constant weights to E -- turned off by default until properly parameterized
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   660
fun add_conjectures_weights [] = I
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   661
  | add_conjectures_weights conjs =
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   662
    let val (hyps, conj) = split_last conjs in
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   663
      add_problem_line_weights conj_weight conj
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   664
      #> fold (add_problem_line_weights hyp_weight) hyps
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   665
    end
a96ac4d180b7 optionally supply constant weights to E -- turned off by default until properly parameterized
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diff changeset
   666
a96ac4d180b7 optionally supply constant weights to E -- turned off by default until properly parameterized
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   667
fun add_facts_weights facts =
a96ac4d180b7 optionally supply constant weights to E -- turned off by default until properly parameterized
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   668
  let
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   669
    val num_facts = length facts
a96ac4d180b7 optionally supply constant weights to E -- turned off by default until properly parameterized
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   670
    fun weight_of j =
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   671
      fact_min_weight + (fact_max_weight - fact_min_weight) * Real.fromInt j
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   672
                        / Real.fromInt num_facts
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   673
  in
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   674
    map weight_of (0 upto num_facts - 1) ~~ facts
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   675
    |> fold (uncurry add_problem_line_weights)
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   676
  end
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   677
a96ac4d180b7 optionally supply constant weights to E -- turned off by default until properly parameterized
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   678
(* Weights are from 0.0 (most important) to 1.0 (least important). *)
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   679
fun atp_problem_weights problem =
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   680
  Symtab.empty
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   681
  |> add_conjectures_weights (these (AList.lookup (op =) problem conjsN))
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   682
  |> add_facts_weights (these (AList.lookup (op =) problem factsN))
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   683
  |> Symtab.dest
a96ac4d180b7 optionally supply constant weights to E -- turned off by default until properly parameterized
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   684
38282
319c59682c51 move Sledgehammer's HOL -> FOL translation to separate file (sledgehammer_translate.ML)
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   685
end;