src/HOL/Tools/Sledgehammer/sledgehammer_atp_translate.ML
author blanchet
Wed May 04 23:18:28 2011 +0200 (2011-05-04)
changeset 42685 7a5116bd63b7
parent 42684 2123b2608b14
child 42687 8a4682bf70ed
permissions -rw-r--r--
documentation tuning
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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 fo_term = 'a ATP_Problem.fo_term
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  type 'a problem = 'a ATP_Problem.problem
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  type locality = Sledgehammer_Filter.locality
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  datatype polymorphism = Polymorphic | Monomorphic | Mangled_Monomorphic
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  datatype type_level =
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    All_Types | Nonmonotonic_Types | Finite_Types | Const_Arg_Types | No_Types
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  datatype type_system =
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    Simple of type_level |
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    Preds of polymorphism * type_level |
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    Tags of polymorphism * type_level
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  type translated_formula
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  val readable_names : bool Config.T
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  val fact_prefix : string
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  val conjecture_prefix : string
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  val predicator_base : string
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  val explicit_app_base : string
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  val type_pred_base : string
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  val tff_type_prefix : string
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  val type_sys_from_string : string -> type_system
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  val polymorphism_of_type_sys : type_system -> polymorphism
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  val level_of_type_sys : type_system -> type_level
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  val is_type_sys_virtually_sound : type_system -> bool
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  val is_type_sys_fairly_sound : type_system -> bool
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  val num_atp_type_args : theory -> type_system -> string -> int
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  val unmangled_const : string -> string * string fo_term list
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  val translate_atp_fact :
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    Proof.context -> bool -> (string * locality) * thm
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    -> translated_formula option * ((string * locality) * thm)
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  val prepare_atp_problem :
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    Proof.context -> 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 * int
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       * (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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open Sledgehammer_Filter
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(* experimental *)
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val generate_useful_info = false
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(* Readable names are often much shorter, especially if types are mangled in
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   names. Also, the logic for generating legal SNARK sort names is only
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   implemented for readable names. Finally, readable names are, well, more
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   readable. For these reason, they are enabled by default. *)
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val readable_names =
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  Attrib.setup_config_bool @{binding sledgehammer_atp_readable_names} (K true)
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val type_decl_prefix = "type_"
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val sym_decl_prefix = "sym_"
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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 = "crel_";
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val arity_clause_prefix = "arity_"
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val tfree_prefix = "tfree_"
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val predicator_base = "hBOOL"
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val explicit_app_base = "hAPP"
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val type_pred_base = "is"
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val tff_type_prefix = "ty_"
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fun make_tff_type s = tff_type_prefix ^ ascii_of s
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(* official TPTP syntax *)
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val tptp_tff_type_of_types = "$tType"
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val tptp_tff_bool_type = "$o"
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val tptp_false = "$false"
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val tptp_true = "$true"
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(* Freshness almost guaranteed! *)
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val sledgehammer_weak_prefix = "Sledgehammer:"
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datatype polymorphism = Polymorphic | Monomorphic | Mangled_Monomorphic
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datatype type_level =
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  All_Types | Nonmonotonic_Types | Finite_Types | Const_Arg_Types | No_Types
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datatype type_system =
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  Simple of type_level |
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  Preds of polymorphism * type_level |
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  Tags of polymorphism * type_level
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fun type_sys_from_string s =
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  (case try (unprefix "mangled_") s of
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     SOME s => (Mangled_Monomorphic, s)
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   | NONE =>
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     case try (unprefix "mono_") s of
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       SOME s => (Monomorphic, s)
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     | NONE => (Polymorphic, s))
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  ||> (fn s =>
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          case try (unsuffix " ?") s of
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            SOME s => (Nonmonotonic_Types, s)
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          | NONE =>
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            case try (unsuffix " !") s of
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              SOME s => (Finite_Types, s)
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            | NONE => (All_Types, s))
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  |> (fn (polymorphism, (level, core)) =>
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         case (core, (polymorphism, level)) of
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           ("simple", (Polymorphic (* naja *), level)) => Simple level
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         | ("preds", extra) => Preds extra
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         | ("tags", extra) => Tags extra
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         | ("args", (_, All_Types (* naja *))) =>
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           Preds (polymorphism, Const_Arg_Types)
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         | ("erased", (Polymorphic, All_Types (* naja *))) =>
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           Preds (polymorphism, No_Types)
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         | _ => error ("Unknown type system: " ^ quote s ^ "."))
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fun polymorphism_of_type_sys (Simple _) = Mangled_Monomorphic
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  | polymorphism_of_type_sys (Preds (poly, _)) = poly
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  | polymorphism_of_type_sys (Tags (poly, _)) = poly
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fun level_of_type_sys (Simple level) = level
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  | level_of_type_sys (Preds (_, level)) = level
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  | level_of_type_sys (Tags (_, level)) = level
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fun is_type_level_virtually_sound s =
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  s = All_Types orelse s = Nonmonotonic_Types
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val is_type_sys_virtually_sound =
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  is_type_level_virtually_sound o level_of_type_sys
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fun is_type_level_fairly_sound level =
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  is_type_level_virtually_sound level orelse level = Finite_Types
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val is_type_sys_fairly_sound = is_type_level_fairly_sound o level_of_type_sys
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fun formula_map f (AQuant (q, xs, phi)) = AQuant (q, xs, formula_map f phi)
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  | formula_map f (AConn (c, phis)) = AConn (c, map (formula_map f) phis)
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  | formula_map f (AAtom tm) = AAtom (f tm)
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fun formula_fold pos f =
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  let
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    fun aux pos (AQuant (_, _, phi)) = aux pos phi
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      | aux pos (AConn (ANot, [phi])) = aux (Option.map not pos) phi
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      | aux pos (AConn (AImplies, [phi1, phi2])) =
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        aux (Option.map not pos) phi1 #> aux pos phi2
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      | aux pos (AConn (AAnd, phis)) = fold (aux pos) phis
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      | aux pos (AConn (AOr, phis)) = fold (aux pos) phis
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      | aux _ (AConn (_, phis)) = fold (aux NONE) phis
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      | aux pos (AAtom tm) = f pos tm
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  in aux (SOME pos) end
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type translated_formula =
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  {name: string,
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   locality: locality,
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   kind: formula_kind,
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   combformula: (name, typ, combterm) formula,
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   atomic_types: typ list}
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fun update_combformula f ({name, locality, kind, combformula, atomic_types}
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                          : translated_formula) =
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  {name = name, locality = locality, kind = kind, combformula = f combformula,
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   atomic_types = atomic_types} : translated_formula
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fun fact_lift f ({combformula, ...} : translated_formula) = f combformula
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val boring_consts = [explicit_app_base, @{const_name Metis.fequal}]
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fun should_omit_type_args type_sys s =
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  s <> type_pred_base andalso s <> type_tag_name andalso
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  (s = @{const_name HOL.eq} orelse level_of_type_sys type_sys = No_Types orelse
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   (case type_sys of
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      Tags (_, All_Types) => true
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    | _ => polymorphism_of_type_sys type_sys <> Mangled_Monomorphic andalso
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           member (op =) boring_consts s))
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datatype type_arg_policy = No_Type_Args | Explicit_Type_Args | Mangled_Type_Args
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fun general_type_arg_policy type_sys =
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  if level_of_type_sys type_sys = No_Types then
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    No_Type_Args
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  else if polymorphism_of_type_sys type_sys = Mangled_Monomorphic then
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    Mangled_Type_Args
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  else
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    Explicit_Type_Args
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fun type_arg_policy type_sys s =
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  if should_omit_type_args type_sys s then No_Type_Args
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  else general_type_arg_policy type_sys
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fun num_atp_type_args thy type_sys s =
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  if type_arg_policy type_sys s = Explicit_Type_Args then num_type_args thy s
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  else 0
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fun atp_type_literals_for_types type_sys kind Ts =
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  if level_of_type_sys type_sys = No_Types then
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    []
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  else
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    Ts |> type_literals_for_types
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       |> filter (fn TyLitVar _ => kind <> Conjecture
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                   | TyLitFree _ => kind = Conjecture)
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fun mk_aconn c phi1 phi2 = AConn (c, [phi1, phi2])
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fun mk_aconns c phis =
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  let val (phis', phi') = split_last phis in
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    fold_rev (mk_aconn c) phis' phi'
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  end
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fun mk_ahorn [] phi = phi
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  | mk_ahorn phis psi = AConn (AImplies, [mk_aconns AAnd phis, psi])
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fun mk_aquant _ [] phi = phi
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  | mk_aquant q xs (phi as AQuant (q', xs', phi')) =
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    if q = q' then AQuant (q, xs @ xs', phi') else AQuant (q, xs, phi)
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  | mk_aquant q xs phi = AQuant (q, xs, phi)
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fun close_universally atom_vars phi =
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  let
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    fun formula_vars bounds (AQuant (_, xs, phi)) =
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        formula_vars (map fst 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) =
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        union (op =) (atom_vars tm []
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                      |> filter_out (member (op =) bounds o fst))
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  in mk_aquant AForall (formula_vars [] phi []) phi end
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fun combterm_vars (CombApp (tm1, tm2)) = fold combterm_vars [tm1, tm2]
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  | combterm_vars (CombConst _) = I
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  | combterm_vars (CombVar (name, T)) = insert (op =) (name, SOME T)
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fun close_combformula_universally phi = close_universally combterm_vars phi
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fun term_vars (ATerm (name as (s, _), tms)) =
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  is_atp_variable s ? insert (op =) (name, NONE)
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  #> fold term_vars tms
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fun close_formula_universally phi = close_universally term_vars phi
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fun fo_term_from_typ (Type (s, Ts)) =
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    ATerm (`make_fixed_type_const s, map fo_term_from_typ Ts)
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  | fo_term_from_typ (TFree (s, _)) =
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    ATerm (`make_fixed_type_var s, [])
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  | fo_term_from_typ (TVar ((x as (s, _)), _)) =
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    ATerm ((make_schematic_type_var x, s), [])
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(* This shouldn't clash with anything else. *)
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val mangled_type_sep = "\000"
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fun generic_mangled_type_name f (ATerm (name, [])) = f name
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  | generic_mangled_type_name f (ATerm (name, tys)) =
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    f name ^ "(" ^ commas (map (generic_mangled_type_name f) tys) ^ ")"
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val mangled_type_name =
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  fo_term_from_typ
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  #> (fn ty => (make_tff_type (generic_mangled_type_name fst ty),
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                generic_mangled_type_name snd ty))
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fun generic_mangled_type_suffix f g Ts =
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  fold_rev (curry (op ^) o g o prefix mangled_type_sep
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            o generic_mangled_type_name f) Ts ""
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fun mangled_const_name T_args (s, s') =
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  let val ty_args = map fo_term_from_typ T_args in
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    (s ^ generic_mangled_type_suffix fst ascii_of ty_args,
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     s' ^ generic_mangled_type_suffix snd I ty_args)
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  end
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val parse_mangled_ident =
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  Scan.many1 (not o member (op =) ["(", ")", ","]) >> implode
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fun parse_mangled_type x =
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  (parse_mangled_ident
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   -- Scan.optional ($$ "(" |-- Scan.optional parse_mangled_types [] --| $$ ")")
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                    [] >> ATerm) x
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and parse_mangled_types x =
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  (parse_mangled_type ::: Scan.repeat ($$ "," |-- parse_mangled_type)) x
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fun unmangled_type s =
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  s |> suffix ")" |> raw_explode
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    |> Scan.finite Symbol.stopper
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           (Scan.error (!! (fn _ => raise Fail ("unrecognized mangled type " ^
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                                                quote s)) parse_mangled_type))
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    |> fst
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val unmangled_const_name = space_explode mangled_type_sep #> hd
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fun unmangled_const s =
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  let val ss = space_explode mangled_type_sep s in
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    (hd ss, map unmangled_type (tl ss))
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  end
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fun introduce_proxies tm =
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  let
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    fun aux top_level (CombApp (tm1, tm2)) =
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        CombApp (aux top_level tm1, aux false tm2)
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      | aux top_level (CombConst (name as (s, s'), T, T_args)) =
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        (case proxify_const s of
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           SOME proxy_base =>
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           if top_level then
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             (case s of
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                "c_False" => (tptp_false, s')
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              | "c_True" => (tptp_true, s')
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              | _ => name, [])
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           else
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             (proxy_base |>> prefix const_prefix, T_args)
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          | NONE => (name, T_args))
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        |> (fn (name, T_args) => CombConst (name, T, T_args))
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      | aux _ tm = tm
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  in aux true tm end
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fun combformula_from_prop thy eq_as_iff =
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  let
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    fun do_term bs t atomic_types =
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      combterm_from_term thy bs (Envir.eta_contract t)
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      |>> (introduce_proxies #> AAtom)
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      ||> union (op =) atomic_types
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    fun do_quant bs q s T t' =
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   319
      let val s = Name.variant (map fst bs) s in
blanchet@38518
   320
        do_formula ((s, T) :: bs) t'
blanchet@42562
   321
        #>> mk_aquant q [(`make_bound_var s, SOME T)]
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   322
      end
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   323
    and do_conn bs c t1 t2 =
blanchet@38282
   324
      do_formula bs t1 ##>> do_formula bs t2
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   325
      #>> uncurry (mk_aconn c)
blanchet@38282
   326
    and do_formula bs t =
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   327
      case t of
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   328
        @{const Not} $ t1 => do_formula bs t1 #>> mk_anot
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   329
      | Const (@{const_name All}, _) $ Abs (s, T, t') =>
blanchet@38282
   330
        do_quant bs AForall s T t'
blanchet@38282
   331
      | Const (@{const_name Ex}, _) $ Abs (s, T, t') =>
blanchet@38282
   332
        do_quant bs AExists s T t'
haftmann@38795
   333
      | @{const HOL.conj} $ t1 $ t2 => do_conn bs AAnd t1 t2
haftmann@38795
   334
      | @{const HOL.disj} $ t1 $ t2 => do_conn bs AOr t1 t2
haftmann@38786
   335
      | @{const HOL.implies} $ t1 $ t2 => do_conn bs AImplies t1 t2
haftmann@38864
   336
      | Const (@{const_name HOL.eq}, Type (_, [@{typ bool}, _])) $ t1 $ t2 =>
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   337
        if eq_as_iff then do_conn bs AIff t1 t2 else do_term bs t
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   338
      | _ => do_term bs t
blanchet@38282
   339
  in do_formula [] end
blanchet@38282
   340
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   341
val presimplify_term = prop_of o Meson.presimplify oo Skip_Proof.make_thm
blanchet@38282
   342
wenzelm@41491
   343
fun concealed_bound_name j = sledgehammer_weak_prefix ^ string_of_int j
blanchet@38282
   344
fun conceal_bounds Ts t =
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   345
  subst_bounds (map (Free o apfst concealed_bound_name)
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   346
                    (0 upto length Ts - 1 ~~ Ts), t)
blanchet@38282
   347
fun reveal_bounds Ts =
blanchet@38282
   348
  subst_atomic (map (fn (j, T) => (Free (concealed_bound_name j, T), Bound j))
blanchet@38282
   349
                    (0 upto length Ts - 1 ~~ Ts))
blanchet@38282
   350
blanchet@38608
   351
(* Removes the lambdas from an equation of the form "t = (%x. u)".
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   352
   (Cf. "extensionalize_theorem" in "Meson_Clausify".) *)
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   353
fun extensionalize_term t =
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   354
  let
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   355
    fun aux j (@{const Trueprop} $ t') = @{const Trueprop} $ aux j t'
blanchet@38608
   356
      | aux j (t as Const (s, Type (_, [Type (_, [_, T']),
blanchet@38608
   357
                                        Type (_, [_, res_T])]))
blanchet@38608
   358
                    $ t2 $ Abs (var_s, var_T, t')) =
haftmann@38864
   359
        if s = @{const_name HOL.eq} orelse s = @{const_name "=="} then
blanchet@38608
   360
          let val var_t = Var ((var_s, j), var_T) in
blanchet@38608
   361
            Const (s, T' --> T' --> res_T)
blanchet@38608
   362
              $ betapply (t2, var_t) $ subst_bound (var_t, t')
blanchet@38608
   363
            |> aux (j + 1)
blanchet@38608
   364
          end
blanchet@38608
   365
        else
blanchet@38608
   366
          t
blanchet@38608
   367
      | aux _ t = t
blanchet@38608
   368
  in aux (maxidx_of_term t + 1) t end
blanchet@38608
   369
blanchet@38282
   370
fun introduce_combinators_in_term ctxt kind t =
wenzelm@42361
   371
  let val thy = Proof_Context.theory_of ctxt in
blanchet@38491
   372
    if Meson.is_fol_term thy t then
blanchet@38491
   373
      t
blanchet@38491
   374
    else
blanchet@38491
   375
      let
blanchet@38491
   376
        fun aux Ts t =
blanchet@38491
   377
          case t of
blanchet@38491
   378
            @{const Not} $ t1 => @{const Not} $ aux Ts t1
blanchet@38491
   379
          | (t0 as Const (@{const_name All}, _)) $ Abs (s, T, t') =>
blanchet@38491
   380
            t0 $ Abs (s, T, aux (T :: Ts) t')
blanchet@38652
   381
          | (t0 as Const (@{const_name All}, _)) $ t1 =>
blanchet@38652
   382
            aux Ts (t0 $ eta_expand Ts t1 1)
blanchet@38491
   383
          | (t0 as Const (@{const_name Ex}, _)) $ Abs (s, T, t') =>
blanchet@38491
   384
            t0 $ Abs (s, T, aux (T :: Ts) t')
blanchet@38652
   385
          | (t0 as Const (@{const_name Ex}, _)) $ t1 =>
blanchet@38652
   386
            aux Ts (t0 $ eta_expand Ts t1 1)
haftmann@38795
   387
          | (t0 as @{const HOL.conj}) $ t1 $ t2 => t0 $ aux Ts t1 $ aux Ts t2
haftmann@38795
   388
          | (t0 as @{const HOL.disj}) $ t1 $ t2 => t0 $ aux Ts t1 $ aux Ts t2
haftmann@38786
   389
          | (t0 as @{const HOL.implies}) $ t1 $ t2 => t0 $ aux Ts t1 $ aux Ts t2
haftmann@38864
   390
          | (t0 as Const (@{const_name HOL.eq}, Type (_, [@{typ bool}, _])))
blanchet@38491
   391
              $ t1 $ t2 =>
blanchet@38491
   392
            t0 $ aux Ts t1 $ aux Ts t2
blanchet@38491
   393
          | _ => if not (exists_subterm (fn Abs _ => true | _ => false) t) then
blanchet@38491
   394
                   t
blanchet@38491
   395
                 else
blanchet@38491
   396
                   t |> conceal_bounds Ts
blanchet@38491
   397
                     |> Envir.eta_contract
blanchet@38491
   398
                     |> cterm_of thy
blanchet@39890
   399
                     |> Meson_Clausify.introduce_combinators_in_cterm
blanchet@38491
   400
                     |> prop_of |> Logic.dest_equals |> snd
blanchet@38491
   401
                     |> reveal_bounds Ts
blanchet@39370
   402
        val (t, ctxt') = Variable.import_terms true [t] ctxt |>> the_single
blanchet@38491
   403
      in t |> aux [] |> singleton (Variable.export_terms ctxt' ctxt) end
blanchet@38491
   404
      handle THM _ =>
blanchet@38491
   405
             (* A type variable of sort "{}" will make abstraction fail. *)
blanchet@38613
   406
             if kind = Conjecture then HOLogic.false_const
blanchet@38613
   407
             else HOLogic.true_const
blanchet@38491
   408
  end
blanchet@38282
   409
blanchet@38282
   410
(* Metis's use of "resolve_tac" freezes the schematic variables. We simulate the
blanchet@42353
   411
   same in Sledgehammer to prevent the discovery of unreplayable proofs. *)
blanchet@38282
   412
fun freeze_term t =
blanchet@38282
   413
  let
blanchet@38282
   414
    fun aux (t $ u) = aux t $ aux u
blanchet@38282
   415
      | aux (Abs (s, T, t)) = Abs (s, T, aux t)
blanchet@38282
   416
      | aux (Var ((s, i), T)) =
blanchet@38282
   417
        Free (sledgehammer_weak_prefix ^ s ^ "_" ^ string_of_int i, T)
blanchet@38282
   418
      | aux t = t
blanchet@38282
   419
  in t |> exists_subterm is_Var t ? aux end
blanchet@38282
   420
blanchet@40204
   421
(* making fact and conjecture formulas *)
blanchet@42640
   422
fun make_formula ctxt eq_as_iff presimp name loc kind t =
blanchet@38282
   423
  let
wenzelm@42361
   424
    val thy = Proof_Context.theory_of ctxt
blanchet@38608
   425
    val t = t |> Envir.beta_eta_contract
blanchet@38652
   426
              |> transform_elim_term
blanchet@41211
   427
              |> Object_Logic.atomize_term thy
blanchet@42563
   428
    val need_trueprop = (fastype_of t = @{typ bool})
blanchet@38652
   429
    val t = t |> need_trueprop ? HOLogic.mk_Trueprop
blanchet@38282
   430
              |> extensionalize_term
blanchet@38282
   431
              |> presimp ? presimplify_term thy
blanchet@38282
   432
              |> perhaps (try (HOLogic.dest_Trueprop))
blanchet@38282
   433
              |> introduce_combinators_in_term ctxt kind
blanchet@38613
   434
              |> kind <> Axiom ? freeze_term
blanchet@42562
   435
    val (combformula, atomic_types) =
blanchet@42562
   436
      combformula_from_prop thy eq_as_iff t []
blanchet@38282
   437
  in
blanchet@42640
   438
    {name = name, locality = loc, kind = kind, combformula = combformula,
blanchet@42562
   439
     atomic_types = atomic_types}
blanchet@38282
   440
  end
blanchet@38282
   441
blanchet@42640
   442
fun make_fact ctxt keep_trivial eq_as_iff presimp ((name, loc), t) =
blanchet@42640
   443
  case (keep_trivial, make_formula ctxt eq_as_iff presimp name loc Axiom t) of
blanchet@41990
   444
    (false, {combformula = AAtom (CombConst (("c_True", _), _, _)), ...}) =>
blanchet@41990
   445
    NONE
blanchet@41990
   446
  | (_, formula) => SOME formula
blanchet@42561
   447
blanchet@42544
   448
fun make_conjecture ctxt ts =
blanchet@38613
   449
  let val last = length ts - 1 in
blanchet@42640
   450
    map2 (fn j => make_formula ctxt true true (string_of_int j) Chained
blanchet@38613
   451
                               (if j = last then Conjecture else Hypothesis))
blanchet@38613
   452
         (0 upto last) ts
blanchet@38613
   453
  end
blanchet@38282
   454
blanchet@42682
   455
(** Finite and infinite type inference **)
blanchet@42682
   456
blanchet@42682
   457
(* Finite types such as "unit", "bool", "bool * bool", and "bool => bool" are
blanchet@42682
   458
   dangerous because their "exhaust" properties can easily lead to unsound ATP
blanchet@42682
   459
   proofs. On the other hand, all HOL infinite types can be given the same
blanchet@42682
   460
   models in first-order logic (via Löwenheim-Skolem). *)
blanchet@42682
   461
blanchet@42682
   462
fun datatype_constrs thy (T as Type (s, Ts)) =
blanchet@42682
   463
    (case Datatype.get_info thy s of
blanchet@42682
   464
       SOME {index, descr, ...} =>
blanchet@42682
   465
       let val (_, dtyps, constrs) = AList.lookup (op =) descr index |> the in
blanchet@42682
   466
         map (apsnd (fn Us => map (typ_of_dtyp descr (dtyps ~~ Ts)) Us ---> T))
blanchet@42682
   467
             constrs
blanchet@42682
   468
       end
blanchet@42682
   469
     | NONE => [])
blanchet@42682
   470
  | datatype_constrs _ _ = []
blanchet@42682
   471
blanchet@42682
   472
(* Similar to "Nitpick_HOL.bounded_exact_card_of_type".
blanchet@42682
   473
   0 means infinite type, 1 means singleton type (e.g., "unit"), and 2 means
blanchet@42682
   474
   cardinality 2 or more. The specified default cardinality is returned if the
blanchet@42682
   475
   cardinality of the type can't be determined. *)
blanchet@42682
   476
fun tiny_card_of_type ctxt default_card T =
blanchet@42682
   477
  let
blanchet@42682
   478
    val max = 2 (* 1 would be too small for the "fun" case *)
blanchet@42682
   479
    fun aux avoid T =
blanchet@42682
   480
      (if member (op =) avoid T then
blanchet@42682
   481
         0
blanchet@42682
   482
       else case T of
blanchet@42682
   483
         Type (@{type_name fun}, [T1, T2]) =>
blanchet@42682
   484
         (case (aux avoid T1, aux avoid T2) of
blanchet@42682
   485
            (_, 1) => 1
blanchet@42682
   486
          | (0, _) => 0
blanchet@42682
   487
          | (_, 0) => 0
blanchet@42682
   488
          | (k1, k2) =>
blanchet@42682
   489
            if k1 >= max orelse k2 >= max then max
blanchet@42682
   490
            else Int.min (max, Integer.pow k2 k1))
blanchet@42682
   491
       | @{typ int} => 0
blanchet@42682
   492
       | @{typ bool} => 2 (* optimization *)
blanchet@42682
   493
       | Type _ =>
blanchet@42682
   494
         let val thy = Proof_Context.theory_of ctxt in
blanchet@42682
   495
           case datatype_constrs thy T of
blanchet@42682
   496
             [] => default_card
blanchet@42682
   497
           | constrs =>
blanchet@42682
   498
             let
blanchet@42682
   499
               val constr_cards =
blanchet@42682
   500
                 map (Integer.prod o map (aux (T :: avoid)) o binder_types
blanchet@42682
   501
                      o snd) constrs
blanchet@42682
   502
             in
blanchet@42682
   503
               if exists (curry (op =) 0) constr_cards then 0
blanchet@42682
   504
               else Int.min (max, Integer.sum constr_cards)
blanchet@42682
   505
             end
blanchet@42682
   506
         end
blanchet@42682
   507
       | _ => default_card)
blanchet@42682
   508
  in Int.min (max, aux [] T) end
blanchet@42682
   509
blanchet@42682
   510
fun is_type_surely_finite ctxt T = tiny_card_of_type ctxt 0 T <> 0
blanchet@42682
   511
fun is_type_surely_infinite ctxt T = tiny_card_of_type ctxt 1 T = 0
blanchet@42682
   512
blanchet@42682
   513
fun should_encode_type _ _ All_Types _ = true
blanchet@42682
   514
  | should_encode_type ctxt _ Finite_Types T = is_type_surely_finite ctxt T
blanchet@42682
   515
  | should_encode_type _ nonmono_Ts Nonmonotonic_Types T =
blanchet@42682
   516
    exists (curry Type.raw_instance T) nonmono_Ts
blanchet@42682
   517
  | should_encode_type _ _ _ _ = false
blanchet@42682
   518
blanchet@42682
   519
fun should_predicate_on_type ctxt nonmono_Ts (Preds (_, level)) T =
blanchet@42682
   520
    should_encode_type ctxt nonmono_Ts level T
blanchet@42682
   521
  | should_predicate_on_type _ _ _ _ = false
blanchet@42682
   522
blanchet@42682
   523
fun should_tag_with_type ctxt nonmono_Ts (Tags (_, level)) T =
blanchet@42682
   524
    should_encode_type ctxt nonmono_Ts level T
blanchet@42682
   525
  | should_tag_with_type _ _ _ _ = false
blanchet@42682
   526
blanchet@42682
   527
val homo_infinite_T = @{typ ind} (* any infinite type *)
blanchet@42682
   528
blanchet@42682
   529
fun homogenized_type ctxt nonmono_Ts level T =
blanchet@42682
   530
  if should_encode_type ctxt nonmono_Ts level T then T else homo_infinite_T
blanchet@42682
   531
blanchet@42573
   532
(** "hBOOL" and "hAPP" **)
blanchet@41313
   533
blanchet@42574
   534
type sym_info =
blanchet@42563
   535
  {pred_sym : bool, min_ary : int, max_ary : int, typ : typ option}
blanchet@42563
   536
blanchet@42574
   537
fun add_combterm_syms_to_table explicit_apply =
blanchet@42558
   538
  let
blanchet@42558
   539
    fun aux top_level tm =
blanchet@42558
   540
      let val (head, args) = strip_combterm_comb tm in
blanchet@42558
   541
        (case head of
blanchet@42563
   542
           CombConst ((s, _), T, _) =>
blanchet@42558
   543
           if String.isPrefix bound_var_prefix s then
blanchet@42558
   544
             I
blanchet@42558
   545
           else
blanchet@42563
   546
             let val ary = length args in
blanchet@42558
   547
               Symtab.map_default
blanchet@42558
   548
                   (s, {pred_sym = true,
blanchet@42563
   549
                        min_ary = if explicit_apply then 0 else ary,
blanchet@42563
   550
                        max_ary = 0, typ = SOME T})
blanchet@42563
   551
                   (fn {pred_sym, min_ary, max_ary, typ} =>
blanchet@42558
   552
                       {pred_sym = pred_sym andalso top_level,
blanchet@42563
   553
                        min_ary = Int.min (ary, min_ary),
blanchet@42563
   554
                        max_ary = Int.max (ary, max_ary),
blanchet@42563
   555
                        typ = if typ = SOME T then typ else NONE})
blanchet@42558
   556
            end
blanchet@42558
   557
         | _ => I)
blanchet@42558
   558
        #> fold (aux false) args
blanchet@42558
   559
      end
blanchet@42558
   560
  in aux true end
blanchet@42674
   561
fun add_fact_syms_to_table explicit_apply =
blanchet@42680
   562
  fact_lift (formula_fold true (K (add_combterm_syms_to_table explicit_apply)))
blanchet@38282
   563
blanchet@42675
   564
val default_sym_table_entries : (string * sym_info) list =
blanchet@42563
   565
  [("equal", {pred_sym = true, min_ary = 2, max_ary = 2, typ = NONE}),
blanchet@42568
   566
   (make_fixed_const predicator_base,
blanchet@42563
   567
    {pred_sym = true, min_ary = 1, max_ary = 1, typ = NONE})] @
blanchet@42568
   568
  ([tptp_false, tptp_true]
blanchet@42563
   569
   |> map (rpair {pred_sym = true, min_ary = 0, max_ary = 0, typ = NONE}))
blanchet@41140
   570
blanchet@42544
   571
fun sym_table_for_facts explicit_apply facts =
blanchet@42568
   572
  Symtab.empty |> fold Symtab.default default_sym_table_entries
blanchet@42574
   573
               |> fold (add_fact_syms_to_table explicit_apply) facts
blanchet@38282
   574
blanchet@42558
   575
fun min_arity_of sym_tab s =
blanchet@42558
   576
  case Symtab.lookup sym_tab s of
blanchet@42574
   577
    SOME ({min_ary, ...} : sym_info) => min_ary
blanchet@42558
   578
  | NONE =>
blanchet@42558
   579
    case strip_prefix_and_unascii const_prefix s of
blanchet@42547
   580
      SOME s =>
blanchet@42570
   581
      let val s = s |> unmangled_const_name |> invert_const in
blanchet@42568
   582
        if s = predicator_base then 1
blanchet@42547
   583
        else if s = explicit_app_base then 2
blanchet@42547
   584
        else if s = type_pred_base then 1
blanchet@42557
   585
        else 0
blanchet@42547
   586
      end
blanchet@42544
   587
    | NONE => 0
blanchet@38282
   588
blanchet@38282
   589
(* True if the constant ever appears outside of the top-level position in
blanchet@38282
   590
   literals, or if it appears with different arities (e.g., because of different
blanchet@38282
   591
   type instantiations). If false, the constant always receives all of its
blanchet@38282
   592
   arguments and is used as a predicate. *)
blanchet@42558
   593
fun is_pred_sym sym_tab s =
blanchet@42558
   594
  case Symtab.lookup sym_tab s of
blanchet@42574
   595
    SOME ({pred_sym, min_ary, max_ary, ...} : sym_info) =>
blanchet@42574
   596
    pred_sym andalso min_ary = max_ary
blanchet@42558
   597
  | NONE => false
blanchet@38282
   598
blanchet@42568
   599
val predicator_combconst =
blanchet@42568
   600
  CombConst (`make_fixed_const predicator_base, @{typ "bool => bool"}, [])
blanchet@42568
   601
fun predicator tm = CombApp (predicator_combconst, tm)
blanchet@42542
   602
blanchet@42568
   603
fun introduce_predicators_in_combterm sym_tab tm =
blanchet@42542
   604
  case strip_combterm_comb tm of
blanchet@42542
   605
    (CombConst ((s, _), _, _), _) =>
blanchet@42568
   606
    if is_pred_sym sym_tab s then tm else predicator tm
blanchet@42568
   607
  | _ => predicator tm
blanchet@42542
   608
blanchet@42544
   609
fun list_app head args = fold (curry (CombApp o swap)) args head
blanchet@42544
   610
blanchet@42544
   611
fun explicit_app arg head =
blanchet@42544
   612
  let
blanchet@42562
   613
    val head_T = combtyp_of head
blanchet@42562
   614
    val (arg_T, res_T) = dest_funT head_T
blanchet@42544
   615
    val explicit_app =
blanchet@42562
   616
      CombConst (`make_fixed_const explicit_app_base, head_T --> head_T,
blanchet@42562
   617
                 [arg_T, res_T])
blanchet@42544
   618
  in list_app explicit_app [head, arg] end
blanchet@42544
   619
fun list_explicit_app head args = fold explicit_app args head
blanchet@38282
   620
blanchet@42565
   621
fun introduce_explicit_apps_in_combterm sym_tab =
blanchet@42544
   622
  let
blanchet@42544
   623
    fun aux tm =
blanchet@42544
   624
      case strip_combterm_comb tm of
blanchet@42544
   625
        (head as CombConst ((s, _), _, _), args) =>
blanchet@42544
   626
        args |> map aux
blanchet@42557
   627
             |> chop (min_arity_of sym_tab s)
blanchet@42544
   628
             |>> list_app head
blanchet@42544
   629
             |-> list_explicit_app
blanchet@42544
   630
      | (head, args) => list_explicit_app head (map aux args)
blanchet@42544
   631
  in aux end
blanchet@38282
   632
blanchet@42682
   633
fun impose_type_arg_policy_in_combterm ctxt nonmono_Ts type_sys =
blanchet@42573
   634
  let
blanchet@42573
   635
    fun aux (CombApp tmp) = CombApp (pairself aux tmp)
blanchet@42574
   636
      | aux (CombConst (name as (s, _), T, T_args)) =
blanchet@42682
   637
        let
blanchet@42682
   638
          val level = level_of_type_sys type_sys
blanchet@42682
   639
          val (T, T_args) =
blanchet@42682
   640
            (* avoid needless identical homogenized versions of "hAPP" *)
blanchet@42682
   641
            if s = const_prefix ^ explicit_app_base then
blanchet@42682
   642
              T_args |> map (homogenized_type ctxt nonmono_Ts level)
blanchet@42682
   643
                     |> (fn Ts => let val T = hd Ts --> nth Ts 1 in
blanchet@42682
   644
                                    (T --> T, Ts)
blanchet@42682
   645
                                  end)
blanchet@42682
   646
            else
blanchet@42682
   647
              (T, T_args)
blanchet@42682
   648
        in
blanchet@42682
   649
          (case strip_prefix_and_unascii const_prefix s of
blanchet@42682
   650
             NONE => (name, T_args)
blanchet@42682
   651
           | SOME s'' =>
blanchet@42682
   652
             let val s'' = invert_const s'' in
blanchet@42682
   653
               case type_arg_policy type_sys s'' of
blanchet@42682
   654
                 No_Type_Args => (name, [])
blanchet@42682
   655
               | Explicit_Type_Args => (name, T_args)
blanchet@42682
   656
               | Mangled_Type_Args => (mangled_const_name T_args name, [])
blanchet@42682
   657
             end)
blanchet@42682
   658
          |> (fn (name, T_args) => CombConst (name, T, T_args))
blanchet@42682
   659
        end
blanchet@42573
   660
      | aux tm = tm
blanchet@42573
   661
  in aux end
blanchet@42573
   662
blanchet@42682
   663
fun repair_combterm ctxt nonmono_Ts type_sys sym_tab =
blanchet@42565
   664
  introduce_explicit_apps_in_combterm sym_tab
blanchet@42568
   665
  #> introduce_predicators_in_combterm sym_tab
blanchet@42682
   666
  #> impose_type_arg_policy_in_combterm ctxt nonmono_Ts type_sys
blanchet@42682
   667
fun repair_fact ctxt nonmono_Ts type_sys sym_tab =
blanchet@42682
   668
  update_combformula (formula_map
blanchet@42682
   669
      (repair_combterm ctxt nonmono_Ts type_sys sym_tab))
blanchet@42573
   670
blanchet@42573
   671
(** Helper facts **)
blanchet@42573
   672
blanchet@42573
   673
fun ti_ti_helper_fact () =
blanchet@42573
   674
  let
blanchet@42573
   675
    fun var s = ATerm (`I s, [])
blanchet@42589
   676
    fun tag tm = ATerm (`make_fixed_const type_tag_name, [var "X", tm])
blanchet@42573
   677
  in
blanchet@42612
   678
    Formula (helper_prefix ^ "ti_ti", Axiom,
blanchet@42573
   679
             AAtom (ATerm (`I "equal", [tag (tag (var "Y")), tag (var "Y")]))
blanchet@42573
   680
             |> close_formula_universally, NONE, NONE)
blanchet@42573
   681
  end
blanchet@42573
   682
blanchet@42574
   683
fun helper_facts_for_sym ctxt type_sys (s, {typ, ...} : sym_info) =
blanchet@42573
   684
  case strip_prefix_and_unascii const_prefix s of
blanchet@42573
   685
    SOME mangled_s =>
blanchet@42573
   686
    let
blanchet@42573
   687
      val thy = Proof_Context.theory_of ctxt
blanchet@42573
   688
      val unmangled_s = mangled_s |> unmangled_const_name
blanchet@42579
   689
      fun dub_and_inst c needs_some_types (th, j) =
blanchet@42579
   690
        ((c ^ "_" ^ string_of_int j ^ (if needs_some_types then "T" else ""),
blanchet@42640
   691
          Chained),
blanchet@42573
   692
         let val t = th |> prop_of in
blanchet@42589
   693
           t |> (general_type_arg_policy type_sys = Mangled_Type_Args andalso
blanchet@42573
   694
                 not (null (Term.hidden_polymorphism t)))
blanchet@42573
   695
                ? (case typ of
blanchet@42573
   696
                     SOME T => specialize_type thy (invert_const unmangled_s, T)
blanchet@42573
   697
                   | NONE => I)
blanchet@42573
   698
         end)
blanchet@42573
   699
      fun make_facts eq_as_iff =
blanchet@42573
   700
        map_filter (make_fact ctxt false eq_as_iff false)
blanchet@42589
   701
      val has_some_types = is_type_sys_fairly_sound type_sys
blanchet@42573
   702
    in
blanchet@42573
   703
      metis_helpers
blanchet@42579
   704
      |> maps (fn (metis_s, (needs_some_types, ths)) =>
blanchet@42573
   705
                  if metis_s <> unmangled_s orelse
blanchet@42589
   706
                     (needs_some_types andalso not has_some_types) then
blanchet@42573
   707
                    []
blanchet@42573
   708
                  else
blanchet@42573
   709
                    ths ~~ (1 upto length ths)
blanchet@42579
   710
                    |> map (dub_and_inst mangled_s needs_some_types)
blanchet@42579
   711
                    |> make_facts (not needs_some_types))
blanchet@42573
   712
    end
blanchet@42573
   713
  | NONE => []
blanchet@42573
   714
fun helper_facts_for_sym_table ctxt type_sys sym_tab =
blanchet@42573
   715
  Symtab.fold_rev (append o helper_facts_for_sym ctxt type_sys) sym_tab []
blanchet@42573
   716
blanchet@42573
   717
fun translate_atp_fact ctxt keep_trivial =
blanchet@42573
   718
  `(make_fact ctxt keep_trivial true true o apsnd prop_of)
blanchet@42573
   719
blanchet@42573
   720
fun translate_formulas ctxt type_sys hyp_ts concl_t rich_facts =
blanchet@42573
   721
  let
blanchet@42573
   722
    val thy = Proof_Context.theory_of ctxt
blanchet@42573
   723
    val fact_ts = map (prop_of o snd o snd) rich_facts
blanchet@42573
   724
    val (facts, fact_names) =
blanchet@42573
   725
      rich_facts
blanchet@42573
   726
      |> map_filter (fn (NONE, _) => NONE
blanchet@42573
   727
                      | (SOME fact, (name, _)) => SOME (fact, name))
blanchet@42573
   728
      |> ListPair.unzip
blanchet@42573
   729
    (* Remove existing facts from the conjecture, as this can dramatically
blanchet@42573
   730
       boost an ATP's performance (for some reason). *)
blanchet@42573
   731
    val hyp_ts = hyp_ts |> filter_out (member (op aconv) fact_ts)
blanchet@42573
   732
    val goal_t = Logic.list_implies (hyp_ts, concl_t)
blanchet@42573
   733
    val all_ts = goal_t :: fact_ts
blanchet@42573
   734
    val subs = tfree_classes_of_terms all_ts
blanchet@42573
   735
    val supers = tvar_classes_of_terms all_ts
blanchet@42573
   736
    val tycons = type_consts_of_terms thy all_ts
blanchet@42573
   737
    val conjs = make_conjecture ctxt (hyp_ts @ [concl_t])
blanchet@42573
   738
    val (supers', arity_clauses) =
blanchet@42589
   739
      if level_of_type_sys type_sys = No_Types then ([], [])
blanchet@42573
   740
      else make_arity_clauses thy tycons supers
blanchet@42573
   741
    val class_rel_clauses = make_class_rel_clauses thy subs supers'
blanchet@42573
   742
  in
blanchet@42573
   743
    (fact_names |> map single, (conjs, facts, class_rel_clauses, arity_clauses))
blanchet@42573
   744
  end
blanchet@42573
   745
blanchet@42573
   746
fun fo_literal_from_type_literal (TyLitVar (class, name)) =
blanchet@42573
   747
    (true, ATerm (class, [ATerm (name, [])]))
blanchet@42573
   748
  | fo_literal_from_type_literal (TyLitFree (class, name)) =
blanchet@42573
   749
    (true, ATerm (class, [ATerm (name, [])]))
blanchet@42573
   750
blanchet@42573
   751
fun formula_from_fo_literal (pos, t) = AAtom t |> not pos ? mk_anot
blanchet@42573
   752
blanchet@42682
   753
fun type_pred_combatom ctxt nonmono_Ts type_sys T tm =
blanchet@42573
   754
  CombApp (CombConst (`make_fixed_const type_pred_base, T --> @{typ bool}, [T]),
blanchet@42573
   755
           tm)
blanchet@42682
   756
  |> impose_type_arg_policy_in_combterm ctxt nonmono_Ts type_sys
blanchet@42573
   757
  |> AAtom
blanchet@42573
   758
blanchet@42680
   759
fun formula_from_combformula ctxt nonmono_Ts type_sys =
blanchet@42573
   760
  let
blanchet@42589
   761
    fun tag_with_type type_sys T tm =
blanchet@42589
   762
      CombConst (`make_fixed_const type_tag_name, T --> T, [T])
blanchet@42682
   763
      |> impose_type_arg_policy_in_combterm ctxt nonmono_Ts type_sys
blanchet@42589
   764
      |> do_term true
blanchet@42589
   765
      |> (fn ATerm (s, tms) => ATerm (s, tms @ [tm]))
blanchet@42589
   766
    and do_term top_level u =
blanchet@42573
   767
      let
blanchet@42573
   768
        val (head, args) = strip_combterm_comb u
blanchet@42574
   769
        val (x, T_args) =
blanchet@42573
   770
          case head of
blanchet@42574
   771
            CombConst (name, _, T_args) => (name, T_args)
blanchet@42573
   772
          | CombVar (name, _) => (name, [])
blanchet@42573
   773
          | CombApp _ => raise Fail "impossible \"CombApp\""
blanchet@42574
   774
        val t = ATerm (x, map fo_term_from_typ T_args @
blanchet@42573
   775
                          map (do_term false) args)
blanchet@42574
   776
        val T = combtyp_of u
blanchet@42573
   777
      in
blanchet@42680
   778
        t |> (if not top_level andalso
blanchet@42680
   779
                should_tag_with_type ctxt nonmono_Ts type_sys T then
blanchet@42589
   780
                tag_with_type type_sys T
blanchet@42573
   781
              else
blanchet@42573
   782
                I)
blanchet@42573
   783
      end
blanchet@42573
   784
    val do_bound_type =
blanchet@42682
   785
      case type_sys of
blanchet@42684
   786
        Simple level =>
blanchet@42682
   787
        SOME o mangled_type_name o homogenized_type ctxt nonmono_Ts level
blanchet@42682
   788
      | _ => K NONE
blanchet@42573
   789
    fun do_out_of_bound_type (s, T) =
blanchet@42680
   790
      if should_predicate_on_type ctxt nonmono_Ts type_sys T then
blanchet@42682
   791
        type_pred_combatom ctxt nonmono_Ts type_sys T (CombVar (s, T))
blanchet@42573
   792
        |> do_formula |> SOME
blanchet@42573
   793
      else
blanchet@42573
   794
        NONE
blanchet@42573
   795
    and do_formula (AQuant (q, xs, phi)) =
blanchet@42573
   796
        AQuant (q, xs |> map (apsnd (fn NONE => NONE
blanchet@42574
   797
                                      | SOME T => do_bound_type T)),
blanchet@42573
   798
                (if q = AForall then mk_ahorn else fold_rev (mk_aconn AAnd))
blanchet@42573
   799
                    (map_filter
blanchet@42573
   800
                         (fn (_, NONE) => NONE
blanchet@42574
   801
                           | (s, SOME T) => do_out_of_bound_type (s, T)) xs)
blanchet@42573
   802
                    (do_formula phi))
blanchet@42573
   803
      | do_formula (AConn (c, phis)) = AConn (c, map do_formula phis)
blanchet@42573
   804
      | do_formula (AAtom tm) = AAtom (do_term true tm)
blanchet@42573
   805
  in do_formula end
blanchet@42573
   806
blanchet@42680
   807
fun formula_for_fact ctxt nonmono_Ts type_sys
blanchet@42573
   808
                     ({combformula, atomic_types, ...} : translated_formula) =
blanchet@42573
   809
  mk_ahorn (map (formula_from_fo_literal o fo_literal_from_type_literal)
blanchet@42573
   810
                (atp_type_literals_for_types type_sys Axiom atomic_types))
blanchet@42680
   811
           (formula_from_combformula ctxt nonmono_Ts type_sys
blanchet@42573
   812
                (close_combformula_universally combformula))
blanchet@42573
   813
  |> close_formula_universally
blanchet@42573
   814
blanchet@42640
   815
fun useful_isabelle_info s = SOME (ATerm ("[]", [ATerm ("isabelle_" ^ s, [])]))
blanchet@42640
   816
blanchet@42573
   817
(* Each fact is given a unique fact number to avoid name clashes (e.g., because
blanchet@42573
   818
   of monomorphization). The TPTP explicitly forbids name clashes, and some of
blanchet@42573
   819
   the remote provers might care. *)
blanchet@42680
   820
fun formula_line_for_fact ctxt prefix nonmono_Ts type_sys
blanchet@42640
   821
                          (j, formula as {name, locality, kind, ...}) =
blanchet@42680
   822
  Formula (prefix ^ (if polymorphism_of_type_sys type_sys = Polymorphic then ""
blanchet@42680
   823
                     else string_of_int j ^ "_") ^
blanchet@42647
   824
           ascii_of name,
blanchet@42680
   825
           kind, formula_for_fact ctxt nonmono_Ts type_sys formula, NONE,
blanchet@42640
   826
           if generate_useful_info then
blanchet@42640
   827
             case locality of
blanchet@42640
   828
               Intro => useful_isabelle_info "intro"
blanchet@42640
   829
             | Elim => useful_isabelle_info "elim"
blanchet@42640
   830
             | Simp => useful_isabelle_info "simp"
blanchet@42640
   831
             | _ => NONE
blanchet@42640
   832
           else
blanchet@42640
   833
             NONE)
blanchet@42573
   834
blanchet@42573
   835
fun formula_line_for_class_rel_clause (ClassRelClause {name, subclass,
blanchet@42573
   836
                                                       superclass, ...}) =
blanchet@42573
   837
  let val ty_arg = ATerm (`I "T", []) in
blanchet@42577
   838
    Formula (class_rel_clause_prefix ^ ascii_of name, Axiom,
blanchet@42573
   839
             AConn (AImplies, [AAtom (ATerm (subclass, [ty_arg])),
blanchet@42573
   840
                               AAtom (ATerm (superclass, [ty_arg]))])
blanchet@42573
   841
             |> close_formula_universally, NONE, NONE)
blanchet@42573
   842
  end
blanchet@42573
   843
blanchet@42573
   844
fun fo_literal_from_arity_literal (TConsLit (c, t, args)) =
blanchet@42573
   845
    (true, ATerm (c, [ATerm (t, map (fn arg => ATerm (arg, [])) args)]))
blanchet@42573
   846
  | fo_literal_from_arity_literal (TVarLit (c, sort)) =
blanchet@42573
   847
    (false, ATerm (c, [ATerm (sort, [])]))
blanchet@42573
   848
blanchet@42573
   849
fun formula_line_for_arity_clause (ArityClause {name, conclLit, premLits,
blanchet@42573
   850
                                                ...}) =
blanchet@42577
   851
  Formula (arity_clause_prefix ^ ascii_of name, Axiom,
blanchet@42573
   852
           mk_ahorn (map (formula_from_fo_literal o apfst not
blanchet@42573
   853
                          o fo_literal_from_arity_literal) premLits)
blanchet@42573
   854
                    (formula_from_fo_literal
blanchet@42573
   855
                         (fo_literal_from_arity_literal conclLit))
blanchet@42573
   856
           |> close_formula_universally, NONE, NONE)
blanchet@42573
   857
blanchet@42680
   858
fun formula_line_for_conjecture ctxt nonmono_Ts type_sys
blanchet@42573
   859
        ({name, kind, combformula, ...} : translated_formula) =
blanchet@42577
   860
  Formula (conjecture_prefix ^ name, kind,
blanchet@42680
   861
           formula_from_combformula ctxt nonmono_Ts type_sys
blanchet@42573
   862
                                    (close_combformula_universally combformula)
blanchet@42573
   863
           |> close_formula_universally, NONE, NONE)
blanchet@42573
   864
blanchet@42573
   865
fun free_type_literals type_sys ({atomic_types, ...} : translated_formula) =
blanchet@42573
   866
  atomic_types |> atp_type_literals_for_types type_sys Conjecture
blanchet@42573
   867
               |> map fo_literal_from_type_literal
blanchet@42573
   868
blanchet@42573
   869
fun formula_line_for_free_type j lit =
blanchet@42577
   870
  Formula (tfree_prefix ^ string_of_int j, Hypothesis,
blanchet@42573
   871
           formula_from_fo_literal lit, NONE, NONE)
blanchet@42573
   872
fun formula_lines_for_free_types type_sys facts =
blanchet@42573
   873
  let
blanchet@42573
   874
    val litss = map (free_type_literals type_sys) facts
blanchet@42573
   875
    val lits = fold (union (op =)) litss []
blanchet@42573
   876
  in map2 formula_line_for_free_type (0 upto length lits - 1) lits end
blanchet@42573
   877
blanchet@42573
   878
(** Symbol declarations **)
blanchet@42544
   879
blanchet@42677
   880
fun insert_type get_T x xs =
blanchet@42677
   881
  let val T = get_T x in
blanchet@42677
   882
    if exists (curry Type.raw_instance T o get_T) xs then xs
blanchet@42677
   883
    else x :: filter_out ((fn T' => Type.raw_instance (T', T)) o get_T) xs
blanchet@42677
   884
  end
blanchet@42677
   885
blanchet@42574
   886
fun should_declare_sym type_sys pred_sym s =
blanchet@42542
   887
  not (String.isPrefix bound_var_prefix s) andalso s <> "equal" andalso
blanchet@42645
   888
  not (String.isPrefix "$" s) andalso
blanchet@42684
   889
  ((case type_sys of Simple _ => true | _ => false) orelse not pred_sym)
blanchet@38282
   890
blanchet@42574
   891
fun add_combterm_syms_to_decl_table type_sys repaired_sym_tab =
blanchet@42574
   892
  let
blanchet@42677
   893
    fun declare_sym decl decls =
blanchet@42579
   894
      case type_sys of
blanchet@42677
   895
        Preds (Polymorphic, All_Types) => insert_type #3 decl decls
blanchet@42579
   896
      | _ => insert (op =) decl decls
blanchet@42576
   897
    fun do_term tm =
blanchet@42574
   898
      let val (head, args) = strip_combterm_comb tm in
blanchet@42574
   899
        (case head of
blanchet@42574
   900
           CombConst ((s, s'), T, T_args) =>
blanchet@42574
   901
           let val pred_sym = is_pred_sym repaired_sym_tab s in
blanchet@42574
   902
             if should_declare_sym type_sys pred_sym s then
blanchet@42576
   903
               Symtab.map_default (s, [])
blanchet@42576
   904
                   (declare_sym (s', T_args, T, pred_sym, length args))
blanchet@42574
   905
             else
blanchet@42574
   906
               I
blanchet@42574
   907
           end
blanchet@42574
   908
         | _ => I)
blanchet@42576
   909
        #> fold do_term args
blanchet@42574
   910
      end
blanchet@42576
   911
  in do_term end
blanchet@42574
   912
fun add_fact_syms_to_decl_table type_sys repaired_sym_tab =
blanchet@42680
   913
  fact_lift (formula_fold true
blanchet@42677
   914
      (K (add_combterm_syms_to_decl_table type_sys repaired_sym_tab)))
blanchet@42574
   915
fun sym_decl_table_for_facts type_sys repaired_sym_tab facts =
blanchet@42589
   916
  Symtab.empty |> is_type_sys_fairly_sound type_sys
blanchet@42574
   917
                  ? fold (add_fact_syms_to_decl_table type_sys repaired_sym_tab)
blanchet@42574
   918
                         facts
blanchet@42533
   919
blanchet@42677
   920
fun is_var_or_bound_var (CombConst ((s, _), _, _)) =
blanchet@42677
   921
    String.isPrefix bound_var_prefix s
blanchet@42677
   922
  | is_var_or_bound_var (CombVar _) = true
blanchet@42677
   923
  | is_var_or_bound_var _ = false
blanchet@42677
   924
blanchet@42685
   925
(* This inference is described in section 2.3 of Claessen et al.'s "Sorting it
blanchet@42685
   926
   out with monotonicity" paper presented at CADE 2011. *)
blanchet@42680
   927
fun add_combterm_nonmonotonic_types _ (SOME false) _ = I
blanchet@42680
   928
  | add_combterm_nonmonotonic_types ctxt _
blanchet@42680
   929
        (CombApp (CombApp (CombConst (("equal", _), Type (_, [T, _]), _), tm1),
blanchet@42680
   930
                  tm2)) =
blanchet@42680
   931
    (exists is_var_or_bound_var [tm1, tm2] andalso
blanchet@42680
   932
     not (is_type_surely_infinite ctxt T)) ? insert_type I T
blanchet@42680
   933
  | add_combterm_nonmonotonic_types _ _ _ = I
blanchet@42680
   934
fun add_fact_nonmonotonic_types ctxt ({kind, combformula, ...}
blanchet@42680
   935
                                      : translated_formula) =
blanchet@42680
   936
  formula_fold (kind <> Conjecture) (add_combterm_nonmonotonic_types ctxt)
blanchet@42680
   937
               combformula
blanchet@42680
   938
fun add_nonmonotonic_types_for_facts ctxt type_sys facts =
blanchet@42680
   939
  level_of_type_sys type_sys = Nonmonotonic_Types
blanchet@42682
   940
  ? (insert_type I @{typ bool} (* in case helper "True_or_False" is included *)
blanchet@42682
   941
     #> fold (add_fact_nonmonotonic_types ctxt) facts)
blanchet@42677
   942
blanchet@42574
   943
fun n_ary_strip_type 0 T = ([], T)
blanchet@42574
   944
  | n_ary_strip_type n (Type (@{type_name fun}, [dom_T, ran_T])) =
blanchet@42574
   945
    n_ary_strip_type (n - 1) ran_T |>> cons dom_T
blanchet@42574
   946
  | n_ary_strip_type _ _ = raise Fail "unexpected non-function"
blanchet@42533
   947
blanchet@42579
   948
fun result_type_of_decl (_, _, T, _, ary) = n_ary_strip_type ary T |> snd
blanchet@42579
   949
blanchet@42682
   950
fun decl_line_for_sym s (s', _, T, pred_sym, ary) =
blanchet@42579
   951
  let val (arg_Ts, res_T) = n_ary_strip_type ary T in
blanchet@42612
   952
    Decl (sym_decl_prefix ^ s, (s, s'), map mangled_type_name arg_Ts,
blanchet@42579
   953
          if pred_sym then `I tptp_tff_bool_type else mangled_type_name res_T)
blanchet@42579
   954
  end
blanchet@42579
   955
blanchet@42592
   956
fun is_polymorphic_type T = fold_atyps (fn TVar _ => K true | _ => I) T false
blanchet@42592
   957
blanchet@42680
   958
fun formula_line_for_sym_decl ctxt nonmono_Ts type_sys n s j
blanchet@42680
   959
                              (s', T_args, T, _, ary) =
blanchet@42579
   960
  let
blanchet@42579
   961
    val (arg_Ts, res_T) = n_ary_strip_type ary T
blanchet@42579
   962
    val bound_names =
blanchet@42579
   963
      1 upto length arg_Ts |> map (`I o make_bound_var o string_of_int)
blanchet@42579
   964
    val bound_tms =
blanchet@42579
   965
      bound_names ~~ arg_Ts |> map (fn (name, T) => CombConst (name, T, []))
blanchet@42579
   966
    val bound_Ts =
blanchet@42592
   967
      arg_Ts |> map (fn T => if n > 1 orelse is_polymorphic_type T then SOME T
blanchet@42592
   968
                             else NONE)
blanchet@42579
   969
  in
blanchet@42612
   970
    Formula (sym_decl_prefix ^ s ^
blanchet@42612
   971
             (if n > 1 then "_" ^ string_of_int j else ""), Axiom,
blanchet@42579
   972
             CombConst ((s, s'), T, T_args)
blanchet@42579
   973
             |> fold (curry (CombApp o swap)) bound_tms
blanchet@42682
   974
             |> type_pred_combatom ctxt nonmono_Ts type_sys res_T
blanchet@42579
   975
             |> mk_aquant AForall (bound_names ~~ bound_Ts)
blanchet@42680
   976
             |> formula_from_combformula ctxt nonmono_Ts type_sys
blanchet@42586
   977
             |> close_formula_universally,
blanchet@42579
   978
             NONE, NONE)
blanchet@42579
   979
  end
blanchet@42579
   980
blanchet@42680
   981
fun problem_lines_for_sym_decls ctxt nonmono_Ts type_sys (s, decls) =
blanchet@42682
   982
  case type_sys of
blanchet@42684
   983
    Simple _ => map (decl_line_for_sym s) decls
blanchet@42682
   984
  | _ =>
blanchet@42574
   985
    let
blanchet@42579
   986
      val decls =
blanchet@42579
   987
        case decls of
blanchet@42579
   988
          decl :: (decls' as _ :: _) =>
blanchet@42592
   989
          let val T = result_type_of_decl decl in
blanchet@42592
   990
            if forall ((fn T' => Type.raw_instance (T', T))
blanchet@42592
   991
                       o result_type_of_decl) decls' then
blanchet@42592
   992
              [decl]
blanchet@42592
   993
            else
blanchet@42592
   994
              decls
blanchet@42592
   995
          end
blanchet@42579
   996
        | _ => decls
blanchet@42579
   997
      val n = length decls
blanchet@42579
   998
      val decls =
blanchet@42680
   999
        decls |> filter (should_predicate_on_type ctxt nonmono_Ts type_sys
blanchet@42579
  1000
                         o result_type_of_decl)
blanchet@42574
  1001
    in
blanchet@42680
  1002
      map2 (formula_line_for_sym_decl ctxt nonmono_Ts type_sys n s)
blanchet@42579
  1003
           (0 upto length decls - 1) decls
blanchet@42574
  1004
    end
blanchet@42579
  1005
blanchet@42680
  1006
fun problem_lines_for_sym_decl_table ctxt nonmono_Ts type_sys sym_decl_tab =
blanchet@42680
  1007
  Symtab.fold_rev (append o problem_lines_for_sym_decls ctxt nonmono_Ts
blanchet@42680
  1008
                                                        type_sys)
blanchet@42574
  1009
                  sym_decl_tab []
blanchet@42543
  1010
blanchet@42543
  1011
fun add_tff_types_in_formula (AQuant (_, xs, phi)) =
blanchet@42543
  1012
    union (op =) (map_filter snd xs) #> add_tff_types_in_formula phi
blanchet@42543
  1013
  | add_tff_types_in_formula (AConn (_, phis)) =
blanchet@42543
  1014
    fold add_tff_types_in_formula phis
blanchet@42543
  1015
  | add_tff_types_in_formula (AAtom _) = I
blanchet@42539
  1016
blanchet@42562
  1017
fun add_tff_types_in_problem_line (Decl (_, _, arg_Ts, res_T)) =
blanchet@42562
  1018
    union (op =) (res_T :: arg_Ts)
blanchet@42577
  1019
  | add_tff_types_in_problem_line (Formula (_, _, phi, _, _)) =
blanchet@42543
  1020
    add_tff_types_in_formula phi
blanchet@42543
  1021
blanchet@42543
  1022
fun tff_types_in_problem problem =
blanchet@42543
  1023
  fold (fold add_tff_types_in_problem_line o snd) problem []
blanchet@42543
  1024
blanchet@42545
  1025
fun decl_line_for_tff_type (s, s') =
blanchet@42568
  1026
  Decl (type_decl_prefix ^ ascii_of s, (s, s'), [], `I tptp_tff_type_of_types)
blanchet@42543
  1027
blanchet@42543
  1028
val type_declsN = "Types"
blanchet@42544
  1029
val sym_declsN = "Symbol types"
blanchet@41157
  1030
val factsN = "Relevant facts"
blanchet@41157
  1031
val class_relsN = "Class relationships"
blanchet@42543
  1032
val aritiesN = "Arities"
blanchet@41157
  1033
val helpersN = "Helper facts"
blanchet@41157
  1034
val conjsN = "Conjectures"
blanchet@41313
  1035
val free_typesN = "Type variables"
blanchet@41157
  1036
blanchet@41157
  1037
fun offset_of_heading_in_problem _ [] j = j
blanchet@41157
  1038
  | offset_of_heading_in_problem needle ((heading, lines) :: problem) j =
blanchet@41157
  1039
    if heading = needle then j
blanchet@41157
  1040
    else offset_of_heading_in_problem needle problem (j + length lines)
blanchet@41157
  1041
blanchet@42568
  1042
fun prepare_atp_problem ctxt type_sys explicit_apply hyp_ts concl_t facts =
blanchet@38282
  1043
  let
blanchet@41313
  1044
    val (fact_names, (conjs, facts, class_rel_clauses, arity_clauses)) =
blanchet@41134
  1045
      translate_formulas ctxt type_sys hyp_ts concl_t facts
blanchet@42563
  1046
    val sym_tab = conjs @ facts |> sym_table_for_facts explicit_apply
blanchet@42682
  1047
    val nonmono_Ts =
blanchet@42682
  1048
      [] |> fold (add_nonmonotonic_types_for_facts ctxt type_sys) [facts, conjs]
blanchet@42682
  1049
    val repair = repair_fact ctxt nonmono_Ts type_sys sym_tab
blanchet@42682
  1050
    val (conjs, facts) = (conjs, facts) |> pairself (map repair)
blanchet@42680
  1051
    val repaired_sym_tab = conjs @ facts |> sym_table_for_facts false
blanchet@42573
  1052
    val helpers =
blanchet@42682
  1053
      repaired_sym_tab |> helper_facts_for_sym_table ctxt type_sys |> map repair
blanchet@42680
  1054
    val sym_decl_lines =
blanchet@42680
  1055
      conjs @ facts
blanchet@42680
  1056
      |> sym_decl_table_for_facts type_sys repaired_sym_tab
blanchet@42680
  1057
      |> problem_lines_for_sym_decl_table ctxt nonmono_Ts type_sys
blanchet@42522
  1058
    (* Reordering these might confuse the proof reconstruction code or the SPASS
blanchet@42522
  1059
       Flotter hack. *)
blanchet@38282
  1060
    val problem =
blanchet@42561
  1061
      [(sym_declsN, sym_decl_lines),
blanchet@42680
  1062
       (factsN, map (formula_line_for_fact ctxt fact_prefix nonmono_Ts type_sys)
blanchet@42180
  1063
                    (0 upto length facts - 1 ~~ facts)),
blanchet@42545
  1064
       (class_relsN, map formula_line_for_class_rel_clause class_rel_clauses),
blanchet@42545
  1065
       (aritiesN, map formula_line_for_arity_clause arity_clauses),
blanchet@42680
  1066
       (helpersN, map (formula_line_for_fact ctxt helper_prefix nonmono_Ts
blanchet@42680
  1067
                                             type_sys)
blanchet@42563
  1068
                      (0 upto length helpers - 1 ~~ helpers)
blanchet@42579
  1069
                  |> (case type_sys of
blanchet@42589
  1070
                        Tags (Polymorphic, level) =>
blanchet@42589
  1071
                        member (op =) [Finite_Types, Nonmonotonic_Types] level
blanchet@42589
  1072
                        ? cons (ti_ti_helper_fact ())
blanchet@42579
  1073
                      | _ => I)),
blanchet@42680
  1074
       (conjsN, map (formula_line_for_conjecture ctxt nonmono_Ts type_sys)
blanchet@42680
  1075
                    conjs),
blanchet@42545
  1076
       (free_typesN, formula_lines_for_free_types type_sys (facts @ conjs))]
blanchet@42543
  1077
    val problem =
blanchet@42561
  1078
      problem
blanchet@42682
  1079
      |> (case type_sys of
blanchet@42684
  1080
            Simple _ =>
blanchet@42561
  1081
            cons (type_declsN,
blanchet@42561
  1082
                  map decl_line_for_tff_type (tff_types_in_problem problem))
blanchet@42682
  1083
          | _ => I)
blanchet@42646
  1084
    val (problem, pool) =
blanchet@42646
  1085
      problem |> nice_atp_problem (Config.get ctxt readable_names)
blanchet@38282
  1086
  in
blanchet@38282
  1087
    (problem,
blanchet@38282
  1088
     case pool of SOME the_pool => snd the_pool | NONE => Symtab.empty,
blanchet@42585
  1089
     offset_of_heading_in_problem conjsN problem 0,
blanchet@42541
  1090
     offset_of_heading_in_problem factsN problem 0,
blanchet@41157
  1091
     fact_names |> Vector.fromList)
blanchet@38282
  1092
  end
blanchet@38282
  1093
blanchet@41313
  1094
(* FUDGE *)
blanchet@41313
  1095
val conj_weight = 0.0
blanchet@41770
  1096
val hyp_weight = 0.1
blanchet@41770
  1097
val fact_min_weight = 0.2
blanchet@41313
  1098
val fact_max_weight = 1.0
blanchet@42608
  1099
val type_info_default_weight = 0.8
blanchet@41313
  1100
blanchet@41313
  1101
fun add_term_weights weight (ATerm (s, tms)) =
blanchet@41313
  1102
  (not (is_atp_variable s) andalso s <> "equal") ? Symtab.default (s, weight)
blanchet@41313
  1103
  #> fold (add_term_weights weight) tms
blanchet@42577
  1104
fun add_problem_line_weights weight (Formula (_, _, phi, _, _)) =
blanchet@42680
  1105
    formula_fold true (K (add_term_weights weight)) phi
blanchet@42528
  1106
  | add_problem_line_weights _ _ = I
blanchet@41313
  1107
blanchet@41313
  1108
fun add_conjectures_weights [] = I
blanchet@41313
  1109
  | add_conjectures_weights conjs =
blanchet@41313
  1110
    let val (hyps, conj) = split_last conjs in
blanchet@41313
  1111
      add_problem_line_weights conj_weight conj
blanchet@41313
  1112
      #> fold (add_problem_line_weights hyp_weight) hyps
blanchet@41313
  1113
    end
blanchet@41313
  1114
blanchet@41313
  1115
fun add_facts_weights facts =
blanchet@41313
  1116
  let
blanchet@41313
  1117
    val num_facts = length facts
blanchet@41313
  1118
    fun weight_of j =
blanchet@41313
  1119
      fact_min_weight + (fact_max_weight - fact_min_weight) * Real.fromInt j
blanchet@41313
  1120
                        / Real.fromInt num_facts
blanchet@41313
  1121
  in
blanchet@41313
  1122
    map weight_of (0 upto num_facts - 1) ~~ facts
blanchet@41313
  1123
    |> fold (uncurry add_problem_line_weights)
blanchet@41313
  1124
  end
blanchet@41313
  1125
blanchet@41313
  1126
(* Weights are from 0.0 (most important) to 1.0 (least important). *)
blanchet@41313
  1127
fun atp_problem_weights problem =
blanchet@42608
  1128
  let val get = these o AList.lookup (op =) problem in
blanchet@42608
  1129
    Symtab.empty
blanchet@42608
  1130
    |> add_conjectures_weights (get free_typesN @ get conjsN)
blanchet@42608
  1131
    |> add_facts_weights (get factsN)
blanchet@42608
  1132
    |> fold (fold (add_problem_line_weights type_info_default_weight) o get)
blanchet@42608
  1133
            [sym_declsN, class_relsN, aritiesN]
blanchet@42608
  1134
    |> Symtab.dest
blanchet@42608
  1135
    |> sort (prod_ord Real.compare string_ord o pairself swap)
blanchet@42608
  1136
  end
blanchet@41313
  1137
blanchet@38282
  1138
end;