src/HOL/Tools/ATP/atp_translate.ML
author nik
Tue Jul 05 17:09:59 2011 +0100 (2011-07-05)
changeset 43677 2cd0b478d1b6
parent 43676 3b0b448b4d69
child 43678 56d352659500
permissions -rw-r--r--
added generation of lambdas in THF
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(*  Title:      HOL/Tools/ATP/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 ATP_TRANSLATE =
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sig
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  type ('a, 'b) ho_term = ('a, 'b) ATP_Problem.ho_term
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  type connective = ATP_Problem.connective
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  type ('a, 'b, 'c) formula = ('a, 'b, 'c) ATP_Problem.formula
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  type format = ATP_Problem.format
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  type formula_kind = ATP_Problem.formula_kind
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  type 'a problem = 'a ATP_Problem.problem
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  datatype locality =
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    General | Helper | Extensionality | Intro | Elim | Simp | Local | Assum |
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    Chained
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  datatype order = First_Order | Higher_Order
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  datatype polymorphism = Polymorphic | Monomorphic | Mangled_Monomorphic
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  datatype type_level =
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    All_Types | Noninf_Nonmono_Types | Fin_Nonmono_Types | Const_Arg_Types |
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    No_Types
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  datatype type_heaviness = Heavyweight | Lightweight
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  datatype type_enc =
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    Simple_Types of order * type_level |
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    Preds of polymorphism * type_level * type_heaviness |
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    Tags of polymorphism * type_level * type_heaviness
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  val bound_var_prefix : string
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  val schematic_var_prefix : string
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  val fixed_var_prefix : string
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  val tvar_prefix : string
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  val tfree_prefix : string
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  val const_prefix : string
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  val type_const_prefix : string
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  val class_prefix : string
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  val skolem_const_prefix : string
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  val old_skolem_const_prefix : string
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  val new_skolem_const_prefix : string
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  val type_decl_prefix : string
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  val sym_decl_prefix : string
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  val preds_sym_formula_prefix : string
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  val lightweight_tags_sym_formula_prefix : string
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  val fact_prefix : string
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  val conjecture_prefix : string
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  val helper_prefix : string
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  val class_rel_clause_prefix : string
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  val arity_clause_prefix : string
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  val tfree_clause_prefix : string
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  val typed_helper_suffix : string
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  val untyped_helper_suffix : string
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  val type_tag_idempotence_helper_name : string
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  val predicator_name : string
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  val app_op_name : string
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  val type_tag_name : string
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  val type_pred_name : string
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  val simple_type_prefix : string
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  val prefixed_predicator_name : string
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  val prefixed_app_op_name : string
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  val prefixed_type_tag_name : string
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  val ascii_of : string -> string
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  val unascii_of : string -> string
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  val strip_prefix_and_unascii : string -> string -> string option
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  val proxy_table : (string * (string * (thm * (string * string)))) list
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  val proxify_const : string -> (string * string) option
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  val invert_const : string -> string
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  val unproxify_const : string -> string
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  val new_skolem_var_name_from_const : string -> string
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  val num_type_args : theory -> string -> int
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  val atp_irrelevant_consts : string list
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  val atp_schematic_consts_of : term -> typ list Symtab.table
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  val is_locality_global : locality -> bool
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  val type_enc_from_string : string -> type_enc
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  val polymorphism_of_type_enc : type_enc -> polymorphism
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  val level_of_type_enc : type_enc -> type_level
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  val is_type_enc_virtually_sound : type_enc -> bool
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  val is_type_enc_fairly_sound : type_enc -> bool
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  val choose_format : format list -> type_enc -> format * type_enc
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  val mk_aconns :
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    connective -> ('a, 'b, 'c) formula list -> ('a, 'b, 'c) formula
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  val unmangled_const : string -> string * (string, 'b) ho_term list
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  val unmangled_const_name : string -> string
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  val helper_table : ((string * bool) * thm list) list
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  val factsN : string
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  val prepare_atp_problem :
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    Proof.context -> format -> formula_kind -> formula_kind -> type_enc -> bool
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    -> bool -> bool -> bool -> term list -> term
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    -> ((string * locality) * term) list
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    -> string problem * string Symtab.table * int * int
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       * (string * locality) list vector * int list * int Symtab.table
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  val atp_problem_weights : string problem -> (string * real) list
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end;
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structure ATP_Translate : ATP_TRANSLATE =
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struct
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open ATP_Util
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open ATP_Problem
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type name = string * string
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(* experimental *)
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val generate_useful_info = false
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fun useful_isabelle_info s =
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  if generate_useful_info then
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    SOME (ATerm ("[]", [ATerm ("isabelle_" ^ s, [])]))
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  else
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    NONE
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val intro_info = useful_isabelle_info "intro"
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val elim_info = useful_isabelle_info "elim"
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val simp_info = useful_isabelle_info "simp"
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val bound_var_prefix = "B_"
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val schematic_var_prefix = "V_"
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val fixed_var_prefix = "v_"
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val tvar_prefix = "T_"
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val tfree_prefix = "t_"
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val const_prefix = "c_"
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val type_const_prefix = "tc_"
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val class_prefix = "cl_"
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val skolem_const_prefix = "Sledgehammer" ^ Long_Name.separator ^ "Sko"
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val old_skolem_const_prefix = skolem_const_prefix ^ "o"
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val new_skolem_const_prefix = skolem_const_prefix ^ "n"
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val type_decl_prefix = "ty_"
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val sym_decl_prefix = "sy_"
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val preds_sym_formula_prefix = "psy_"
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val lightweight_tags_sym_formula_prefix = "tsy_"
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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 = "clar_"
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val arity_clause_prefix = "arity_"
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val tfree_clause_prefix = "tfree_"
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val typed_helper_suffix = "_T"
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val untyped_helper_suffix = "_U"
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val type_tag_idempotence_helper_name = helper_prefix ^ "ti_idem"
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val predicator_name = "hBOOL"
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val app_op_name = "hAPP"
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val type_tag_name = "ti"
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val type_pred_name = "is"
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val simple_type_prefix = "ty_"
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val prefixed_predicator_name = const_prefix ^ predicator_name
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val prefixed_app_op_name = const_prefix ^ app_op_name
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val prefixed_type_tag_name = const_prefix ^ type_tag_name
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(* Freshness almost guaranteed! *)
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val sledgehammer_weak_prefix = "Sledgehammer:"
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(*Escaping of special characters.
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  Alphanumeric characters are left unchanged.
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  The character _ goes to __
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  Characters in the range ASCII space to / go to _A to _P, respectively.
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  Other characters go to _nnn where nnn is the decimal ASCII code.*)
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val upper_a_minus_space = Char.ord #"A" - Char.ord #" "
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fun stringN_of_int 0 _ = ""
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  | stringN_of_int k n =
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    stringN_of_int (k - 1) (n div 10) ^ string_of_int (n mod 10)
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fun ascii_of_char c =
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  if Char.isAlphaNum c then
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    String.str c
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  else if c = #"_" then
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    "__"
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  else if #" " <= c andalso c <= #"/" then
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    "_" ^ String.str (Char.chr (Char.ord c + upper_a_minus_space))
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  else
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    (* fixed width, in case more digits follow *)
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    "_" ^ stringN_of_int 3 (Char.ord c)
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val ascii_of = String.translate ascii_of_char
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(** Remove ASCII armoring from names in proof files **)
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(* We don't raise error exceptions because this code can run inside a worker
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   thread. Also, the errors are impossible. *)
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val unascii_of =
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  let
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    fun un rcs [] = String.implode(rev rcs)
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      | un rcs [#"_"] = un (#"_" :: rcs) [] (* ERROR *)
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        (* Three types of _ escapes: __, _A to _P, _nnn *)
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      | un rcs (#"_" :: #"_" :: cs) = un (#"_" :: rcs) cs
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      | un rcs (#"_" :: c :: cs) =
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        if #"A" <= c andalso c<= #"P" then
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          (* translation of #" " to #"/" *)
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          un (Char.chr (Char.ord c - upper_a_minus_space) :: rcs) cs
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        else
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          let val digits = List.take (c :: cs, 3) handle General.Subscript => [] in
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            case Int.fromString (String.implode digits) of
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              SOME n => un (Char.chr n :: rcs) (List.drop (cs, 2))
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            | NONE => un (c :: #"_" :: rcs) cs (* ERROR *)
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          end
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      | un rcs (c :: cs) = un (c :: rcs) cs
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  in un [] o String.explode end
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(* If string s has the prefix s1, return the result of deleting it,
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   un-ASCII'd. *)
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fun strip_prefix_and_unascii s1 s =
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  if String.isPrefix s1 s then
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    SOME (unascii_of (String.extract (s, size s1, NONE)))
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  else
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    NONE
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val proxy_table =
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  [("c_False", (@{const_name False}, (@{thm fFalse_def},
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       ("fFalse", @{const_name ATP.fFalse})))),
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   ("c_True", (@{const_name True}, (@{thm fTrue_def},
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       ("fTrue", @{const_name ATP.fTrue})))),
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   ("c_Not", (@{const_name Not}, (@{thm fNot_def},
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       ("fNot", @{const_name ATP.fNot})))),
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   ("c_conj", (@{const_name conj}, (@{thm fconj_def},
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       ("fconj", @{const_name ATP.fconj})))),
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   ("c_disj", (@{const_name disj}, (@{thm fdisj_def},
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       ("fdisj", @{const_name ATP.fdisj})))),
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   ("c_implies", (@{const_name implies}, (@{thm fimplies_def},
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       ("fimplies", @{const_name ATP.fimplies})))),
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   ("equal", (@{const_name HOL.eq}, (@{thm fequal_def},
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       ("fequal", @{const_name ATP.fequal}))))]
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val proxify_const = AList.lookup (op =) proxy_table #> Option.map (snd o snd)
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(* Readable names for the more common symbolic functions. Do not mess with the
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   table unless you know what you are doing. *)
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val const_trans_table =
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  [(@{type_name Product_Type.prod}, "prod"),
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   (@{type_name Sum_Type.sum}, "sum"),
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   (@{const_name False}, "False"),
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   (@{const_name True}, "True"),
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   (@{const_name Not}, "Not"),
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   (@{const_name conj}, "conj"),
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   (@{const_name disj}, "disj"),
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   (@{const_name implies}, "implies"),
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   (@{const_name HOL.eq}, "equal"),
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   (@{const_name If}, "If"),
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   (@{const_name Set.member}, "member"),
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   (@{const_name Meson.COMBI}, "COMBI"),
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   (@{const_name Meson.COMBK}, "COMBK"),
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   (@{const_name Meson.COMBB}, "COMBB"),
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   (@{const_name Meson.COMBC}, "COMBC"),
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   (@{const_name Meson.COMBS}, "COMBS")]
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  |> Symtab.make
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  |> fold (Symtab.update o swap o snd o snd o snd) proxy_table
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(* Invert the table of translations between Isabelle and ATPs. *)
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val const_trans_table_inv =
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  const_trans_table |> Symtab.dest |> map swap |> Symtab.make
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val const_trans_table_unprox =
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  Symtab.empty
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  |> fold (fn (_, (isa, (_, (_, atp)))) => Symtab.update (atp, isa)) proxy_table
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val invert_const = perhaps (Symtab.lookup const_trans_table_inv)
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val unproxify_const = perhaps (Symtab.lookup const_trans_table_unprox)
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fun lookup_const c =
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  case Symtab.lookup const_trans_table c of
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    SOME c' => c'
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  | NONE => ascii_of c
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fun ascii_of_indexname (v, 0) = ascii_of v
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  | ascii_of_indexname (v, i) = ascii_of v ^ "_" ^ string_of_int i
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fun make_bound_var x = bound_var_prefix ^ ascii_of x
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fun make_schematic_var v = schematic_var_prefix ^ ascii_of_indexname v
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fun make_fixed_var x = fixed_var_prefix ^ ascii_of x
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fun make_schematic_type_var (x, i) =
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      tvar_prefix ^ (ascii_of_indexname (unprefix "'" x, i))
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fun make_fixed_type_var x = tfree_prefix ^ (ascii_of (unprefix "'" x))
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(* "HOL.eq" is mapped to the ATP's equality. *)
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fun make_fixed_const @{const_name HOL.eq} = tptp_old_equal
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  | make_fixed_const c = const_prefix ^ lookup_const c
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fun make_fixed_type_const c = type_const_prefix ^ lookup_const c
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fun make_type_class clas = class_prefix ^ ascii_of clas
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fun new_skolem_var_name_from_const s =
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  let val ss = s |> space_explode Long_Name.separator in
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    nth ss (length ss - 2)
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  end
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(* The number of type arguments of a constant, zero if it's monomorphic. For
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   (instances of) Skolem pseudoconstants, this information is encoded in the
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   constant name. *)
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fun num_type_args thy s =
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  if String.isPrefix skolem_const_prefix s then
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    s |> space_explode Long_Name.separator |> List.last |> Int.fromString |> the
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  else
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    (s, Sign.the_const_type thy s) |> Sign.const_typargs thy |> length
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(* These are either simplified away by "Meson.presimplify" (most of the time) or
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   handled specially via "fFalse", "fTrue", ..., "fequal". *)
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val atp_irrelevant_consts =
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  [@{const_name False}, @{const_name True}, @{const_name Not},
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   @{const_name conj}, @{const_name disj}, @{const_name implies},
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   @{const_name HOL.eq}, @{const_name If}, @{const_name Let}]
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val atp_monomorph_bad_consts =
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  atp_irrelevant_consts @
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  (* These are ignored anyway by the relevance filter (unless they appear in
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     higher-order places) but not by the monomorphizer. *)
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  [@{const_name all}, @{const_name "==>"}, @{const_name "=="},
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   @{const_name Trueprop}, @{const_name All}, @{const_name Ex},
blanchet@43248
   319
   @{const_name Ex1}, @{const_name Ball}, @{const_name Bex}]
blanchet@43248
   320
blanchet@43258
   321
fun add_schematic_const (x as (_, T)) =
blanchet@43258
   322
  Monomorph.typ_has_tvars T ? Symtab.insert_list (op =) x
blanchet@43258
   323
val add_schematic_consts_of =
blanchet@43258
   324
  Term.fold_aterms (fn Const (x as (s, _)) =>
blanchet@43258
   325
                       not (member (op =) atp_monomorph_bad_consts s)
blanchet@43258
   326
                       ? add_schematic_const x
blanchet@43258
   327
                      | _ => I)
blanchet@43258
   328
fun atp_schematic_consts_of t = add_schematic_consts_of t Symtab.empty
blanchet@43248
   329
blanchet@43085
   330
(** Definitions and functions for FOL clauses and formulas for TPTP **)
blanchet@43085
   331
blanchet@43085
   332
(* The first component is the type class; the second is a "TVar" or "TFree". *)
blanchet@43085
   333
datatype type_literal =
blanchet@43085
   334
  TyLitVar of name * name |
blanchet@43085
   335
  TyLitFree of name * name
blanchet@43085
   336
blanchet@43085
   337
blanchet@43085
   338
(** Isabelle arities **)
blanchet@43085
   339
blanchet@43085
   340
datatype arity_literal =
blanchet@43085
   341
  TConsLit of name * name * name list |
blanchet@43085
   342
  TVarLit of name * name
blanchet@43085
   343
blanchet@43085
   344
fun gen_TVars 0 = []
blanchet@43093
   345
  | gen_TVars n = ("T_" ^ string_of_int n) :: gen_TVars (n-1)
blanchet@43085
   346
blanchet@43263
   347
val type_class = the_single @{sort type}
blanchet@43263
   348
blanchet@43263
   349
fun add_packed_sort tvar =
blanchet@43263
   350
  fold (fn s => s <> type_class ? cons (`make_type_class s, `I tvar))
blanchet@43085
   351
blanchet@43086
   352
type arity_clause =
blanchet@43496
   353
  {name : string,
blanchet@43496
   354
   prem_lits : arity_literal list,
blanchet@43496
   355
   concl_lits : arity_literal}
blanchet@43085
   356
blanchet@43085
   357
(* Arity of type constructor "tcon :: (arg1, ..., argN) res" *)
blanchet@43085
   358
fun make_axiom_arity_clause (tcons, name, (cls, args)) =
blanchet@43085
   359
  let
blanchet@43085
   360
    val tvars = gen_TVars (length args)
blanchet@43085
   361
    val tvars_srts = ListPair.zip (tvars, args)
blanchet@43085
   362
  in
blanchet@43086
   363
    {name = name,
blanchet@43263
   364
     prem_lits = [] |> fold (uncurry add_packed_sort) tvars_srts |> map TVarLit,
blanchet@43086
   365
     concl_lits = TConsLit (`make_type_class cls,
blanchet@43086
   366
                            `make_fixed_type_const tcons,
blanchet@43086
   367
                            tvars ~~ tvars)}
blanchet@43085
   368
  end
blanchet@43085
   369
blanchet@43085
   370
fun arity_clause _ _ (_, []) = []
blanchet@43495
   371
  | arity_clause seen n (tcons, ("HOL.type", _) :: ars) =  (* ignore *)
blanchet@43495
   372
    arity_clause seen n (tcons, ars)
blanchet@43495
   373
  | arity_clause seen n (tcons, (ar as (class, _)) :: ars) =
blanchet@43495
   374
    if member (op =) seen class then
blanchet@43495
   375
      (* multiple arities for the same (tycon, class) pair *)
blanchet@43495
   376
      make_axiom_arity_clause (tcons,
blanchet@43495
   377
          lookup_const tcons ^ "___" ^ ascii_of class ^ "_" ^ string_of_int n,
blanchet@43495
   378
          ar) ::
blanchet@43495
   379
      arity_clause seen (n + 1) (tcons, ars)
blanchet@43495
   380
    else
blanchet@43495
   381
      make_axiom_arity_clause (tcons, lookup_const tcons ^ "___" ^
blanchet@43495
   382
                               ascii_of class, ar) ::
blanchet@43495
   383
      arity_clause (class :: seen) n (tcons, ars)
blanchet@43085
   384
blanchet@43085
   385
fun multi_arity_clause [] = []
blanchet@43085
   386
  | multi_arity_clause ((tcons, ars) :: tc_arlists) =
blanchet@43085
   387
      arity_clause [] 1 (tcons, ars) @ multi_arity_clause tc_arlists
blanchet@43085
   388
blanchet@43622
   389
(* Generate all pairs (tycon, class, sorts) such that tycon belongs to class in
blanchet@43622
   390
   theory thy provided its arguments have the corresponding sorts. *)
blanchet@43085
   391
fun type_class_pairs thy tycons classes =
blanchet@43093
   392
  let
blanchet@43093
   393
    val alg = Sign.classes_of thy
blanchet@43093
   394
    fun domain_sorts tycon = Sorts.mg_domain alg tycon o single
blanchet@43093
   395
    fun add_class tycon class =
blanchet@43093
   396
      cons (class, domain_sorts tycon class)
blanchet@43093
   397
      handle Sorts.CLASS_ERROR _ => I
blanchet@43093
   398
    fun try_classes tycon = (tycon, fold (add_class tycon) classes [])
blanchet@43093
   399
  in map try_classes tycons end
blanchet@43085
   400
blanchet@43085
   401
(*Proving one (tycon, class) membership may require proving others, so iterate.*)
blanchet@43085
   402
fun iter_type_class_pairs _ _ [] = ([], [])
blanchet@43085
   403
  | iter_type_class_pairs thy tycons classes =
blanchet@43263
   404
      let
blanchet@43263
   405
        fun maybe_insert_class s =
blanchet@43263
   406
          (s <> type_class andalso not (member (op =) classes s))
blanchet@43263
   407
          ? insert (op =) s
blanchet@43263
   408
        val cpairs = type_class_pairs thy tycons classes
blanchet@43263
   409
        val newclasses =
blanchet@43263
   410
          [] |> fold (fold (fold (fold maybe_insert_class) o snd) o snd) cpairs
blanchet@43263
   411
        val (classes', cpairs') = iter_type_class_pairs thy tycons newclasses
blanchet@43266
   412
      in (classes' @ classes, union (op =) cpairs' cpairs) end
blanchet@43085
   413
blanchet@43085
   414
fun make_arity_clauses thy tycons =
blanchet@43085
   415
  iter_type_class_pairs thy tycons ##> multi_arity_clause
blanchet@43085
   416
blanchet@43085
   417
blanchet@43085
   418
(** Isabelle class relations **)
blanchet@43085
   419
blanchet@43086
   420
type class_rel_clause =
blanchet@43496
   421
  {name : string,
blanchet@43496
   422
   subclass : name,
blanchet@43496
   423
   superclass : name}
blanchet@43085
   424
blanchet@43622
   425
(* Generate all pairs (sub, super) such that sub is a proper subclass of super
blanchet@43622
   426
   in theory "thy". *)
blanchet@43085
   427
fun class_pairs _ [] _ = []
blanchet@43085
   428
  | class_pairs thy subs supers =
blanchet@43085
   429
      let
blanchet@43085
   430
        val class_less = Sorts.class_less (Sign.classes_of thy)
blanchet@43085
   431
        fun add_super sub super = class_less (sub, super) ? cons (sub, super)
blanchet@43085
   432
        fun add_supers sub = fold (add_super sub) supers
blanchet@43085
   433
      in fold add_supers subs [] end
blanchet@43085
   434
blanchet@43622
   435
fun make_class_rel_clause (sub, super) =
blanchet@43622
   436
  {name = sub ^ "_" ^ super, subclass = `make_type_class sub,
blanchet@43086
   437
   superclass = `make_type_class super}
blanchet@43085
   438
blanchet@43085
   439
fun make_class_rel_clauses thy subs supers =
blanchet@43093
   440
  map make_class_rel_clause (class_pairs thy subs supers)
blanchet@43085
   441
blanchet@43085
   442
datatype combterm =
blanchet@43085
   443
  CombConst of name * typ * typ list |
blanchet@43085
   444
  CombVar of name * typ |
nik@43677
   445
  CombApp of combterm * combterm |
nik@43677
   446
  CombAbs of (name * typ) * combterm
blanchet@43085
   447
blanchet@43085
   448
fun combtyp_of (CombConst (_, T, _)) = T
blanchet@43085
   449
  | combtyp_of (CombVar (_, T)) = T
blanchet@43085
   450
  | combtyp_of (CombApp (t1, _)) = snd (dest_funT (combtyp_of t1))
nik@43677
   451
  | combtyp_of (CombAbs ((_, T), tm)) = T --> combtyp_of tm
blanchet@43085
   452
blanchet@43085
   453
(*gets the head of a combinator application, along with the list of arguments*)
blanchet@43085
   454
fun strip_combterm_comb u =
blanchet@43496
   455
  let
blanchet@43496
   456
    fun stripc (CombApp (t, u), ts) = stripc (t, u :: ts)
blanchet@43496
   457
      | stripc x = x
blanchet@43496
   458
  in stripc (u, []) end
blanchet@43085
   459
blanchet@43085
   460
fun atyps_of T = fold_atyps (insert (op =)) T []
blanchet@43085
   461
blanchet@43085
   462
fun new_skolem_const_name s num_T_args =
blanchet@43085
   463
  [new_skolem_const_prefix, s, string_of_int num_T_args]
blanchet@43085
   464
  |> space_implode Long_Name.separator
blanchet@43085
   465
blanchet@43085
   466
(* Converts a term (with combinators) into a combterm. Also accumulates sort
blanchet@43085
   467
   infomation. *)
blanchet@43085
   468
fun combterm_from_term thy bs (P $ Q) =
blanchet@43085
   469
    let
blanchet@43085
   470
      val (P', P_atomics_Ts) = combterm_from_term thy bs P
blanchet@43085
   471
      val (Q', Q_atomics_Ts) = combterm_from_term thy bs Q
blanchet@43085
   472
    in (CombApp (P', Q'), union (op =) P_atomics_Ts Q_atomics_Ts) end
blanchet@43085
   473
  | combterm_from_term thy _ (Const (c, T)) =
blanchet@43085
   474
    let
blanchet@43085
   475
      val tvar_list =
blanchet@43085
   476
        (if String.isPrefix old_skolem_const_prefix c then
blanchet@43085
   477
           [] |> Term.add_tvarsT T |> map TVar
blanchet@43085
   478
         else
blanchet@43085
   479
           (c, T) |> Sign.const_typargs thy)
blanchet@43085
   480
      val c' = CombConst (`make_fixed_const c, T, tvar_list)
blanchet@43085
   481
    in (c', atyps_of T) end
blanchet@43085
   482
  | combterm_from_term _ _ (Free (v, T)) =
blanchet@43085
   483
    (CombConst (`make_fixed_var v, T, []), atyps_of T)
blanchet@43085
   484
  | combterm_from_term _ _ (Var (v as (s, _), T)) =
blanchet@43085
   485
    (if String.isPrefix Meson_Clausify.new_skolem_var_prefix s then
blanchet@43085
   486
       let
blanchet@43085
   487
         val Ts = T |> strip_type |> swap |> op ::
blanchet@43085
   488
         val s' = new_skolem_const_name s (length Ts)
blanchet@43085
   489
       in CombConst (`make_fixed_const s', T, Ts) end
blanchet@43085
   490
     else
blanchet@43085
   491
       CombVar ((make_schematic_var v, s), T), atyps_of T)
blanchet@43085
   492
  | combterm_from_term _ bs (Bound j) =
blanchet@43085
   493
    nth bs j
blanchet@43085
   494
    |> (fn (s, T) => (CombConst (`make_bound_var s, T, []), atyps_of T))
nik@43677
   495
  | combterm_from_term thy bs (Abs (s, T, t)) =
nik@43677
   496
    let val (tm, atomic_Ts) = combterm_from_term thy ((s, T) :: bs) t in
nik@43677
   497
      (CombAbs ((`make_bound_var s, T), tm),
nik@43677
   498
       union (op =) atomic_Ts (atyps_of T))
nik@43677
   499
    end
blanchet@43085
   500
blanchet@43421
   501
datatype locality =
blanchet@43421
   502
  General | Helper | Extensionality | Intro | Elim | Simp | Local | Assum |
blanchet@43421
   503
  Chained
blanchet@43085
   504
blanchet@43085
   505
(* (quasi-)underapproximation of the truth *)
blanchet@43085
   506
fun is_locality_global Local = false
blanchet@43085
   507
  | is_locality_global Assum = false
blanchet@43085
   508
  | is_locality_global Chained = false
blanchet@43085
   509
  | is_locality_global _ = true
blanchet@43085
   510
blanchet@43624
   511
datatype order = First_Order | Higher_Order
blanchet@42613
   512
datatype polymorphism = Polymorphic | Monomorphic | Mangled_Monomorphic
blanchet@42613
   513
datatype type_level =
blanchet@43362
   514
  All_Types | Noninf_Nonmono_Types | Fin_Nonmono_Types | Const_Arg_Types |
blanchet@43362
   515
  No_Types
blanchet@43128
   516
datatype type_heaviness = Heavyweight | Lightweight
blanchet@42613
   517
blanchet@43626
   518
datatype type_enc =
blanchet@43624
   519
  Simple_Types of order * type_level |
blanchet@42837
   520
  Preds of polymorphism * type_level * type_heaviness |
blanchet@42837
   521
  Tags of polymorphism * type_level * type_heaviness
blanchet@42613
   522
blanchet@42689
   523
fun try_unsuffixes ss s =
blanchet@42689
   524
  fold (fn s' => fn NONE => try (unsuffix s') s | some => some) ss NONE
blanchet@42689
   525
blanchet@43626
   526
fun type_enc_from_string s =
blanchet@42722
   527
  (case try (unprefix "poly_") s of
blanchet@42722
   528
     SOME s => (SOME Polymorphic, s)
blanchet@42613
   529
   | NONE =>
blanchet@42613
   530
     case try (unprefix "mono_") s of
blanchet@42722
   531
       SOME s => (SOME Monomorphic, s)
blanchet@42722
   532
     | NONE =>
blanchet@42722
   533
       case try (unprefix "mangled_") s of
blanchet@42722
   534
         SOME s => (SOME Mangled_Monomorphic, s)
blanchet@42722
   535
       | NONE => (NONE, s))
blanchet@42613
   536
  ||> (fn s =>
blanchet@43624
   537
          (* "_query" and "_bang" are for the ASCII-challenged Metis and
blanchet@43624
   538
             Mirabelle. *)
blanchet@42689
   539
          case try_unsuffixes ["?", "_query"] s of
blanchet@43362
   540
            SOME s => (Noninf_Nonmono_Types, s)
blanchet@42613
   541
          | NONE =>
blanchet@42689
   542
            case try_unsuffixes ["!", "_bang"] s of
blanchet@43362
   543
              SOME s => (Fin_Nonmono_Types, s)
blanchet@42613
   544
            | NONE => (All_Types, s))
blanchet@42828
   545
  ||> apsnd (fn s =>
blanchet@42837
   546
                case try (unsuffix "_heavy") s of
blanchet@43128
   547
                  SOME s => (Heavyweight, s)
blanchet@43128
   548
                | NONE => (Lightweight, s))
blanchet@42837
   549
  |> (fn (poly, (level, (heaviness, core))) =>
blanchet@42837
   550
         case (core, (poly, level, heaviness)) of
blanchet@43624
   551
           ("simple", (NONE, _, Lightweight)) =>
blanchet@43624
   552
           Simple_Types (First_Order, level)
blanchet@43624
   553
         | ("simple_higher", (NONE, _, Lightweight)) =>
nik@43676
   554
           if level = Noninf_Nonmono_Types then raise Same.SAME
nik@43676
   555
           else Simple_Types (Higher_Order, level)
blanchet@42854
   556
         | ("preds", (SOME poly, _, _)) => Preds (poly, level, heaviness)
blanchet@42886
   557
         | ("tags", (SOME Polymorphic, _, _)) =>
blanchet@43361
   558
           Tags (Polymorphic, level, heaviness)
blanchet@42854
   559
         | ("tags", (SOME poly, _, _)) => Tags (poly, level, heaviness)
blanchet@43128
   560
         | ("args", (SOME poly, All_Types (* naja *), Lightweight)) =>
blanchet@43128
   561
           Preds (poly, Const_Arg_Types, Lightweight)
blanchet@43128
   562
         | ("erased", (NONE, All_Types (* naja *), Lightweight)) =>
blanchet@43128
   563
           Preds (Polymorphic, No_Types, Lightweight)
blanchet@42753
   564
         | _ => raise Same.SAME)
blanchet@42753
   565
  handle Same.SAME => error ("Unknown type system: " ^ quote s ^ ".")
blanchet@42613
   566
blanchet@43626
   567
fun is_type_enc_higher_order (Simple_Types (Higher_Order, _)) = true
blanchet@43626
   568
  | is_type_enc_higher_order _ = false
blanchet@43624
   569
blanchet@43626
   570
fun polymorphism_of_type_enc (Simple_Types _) = Mangled_Monomorphic
blanchet@43626
   571
  | polymorphism_of_type_enc (Preds (poly, _, _)) = poly
blanchet@43626
   572
  | polymorphism_of_type_enc (Tags (poly, _, _)) = poly
blanchet@42613
   573
blanchet@43626
   574
fun level_of_type_enc (Simple_Types (_, level)) = level
blanchet@43626
   575
  | level_of_type_enc (Preds (_, level, _)) = level
blanchet@43626
   576
  | level_of_type_enc (Tags (_, level, _)) = level
blanchet@42828
   577
blanchet@43626
   578
fun heaviness_of_type_enc (Simple_Types _) = Heavyweight
blanchet@43626
   579
  | heaviness_of_type_enc (Preds (_, _, heaviness)) = heaviness
blanchet@43626
   580
  | heaviness_of_type_enc (Tags (_, _, heaviness)) = heaviness
blanchet@42831
   581
blanchet@42687
   582
fun is_type_level_virtually_sound level =
blanchet@43362
   583
  level = All_Types orelse level = Noninf_Nonmono_Types
blanchet@43626
   584
val is_type_enc_virtually_sound =
blanchet@43626
   585
  is_type_level_virtually_sound o level_of_type_enc
blanchet@42613
   586
blanchet@42613
   587
fun is_type_level_fairly_sound level =
blanchet@43362
   588
  is_type_level_virtually_sound level orelse level = Fin_Nonmono_Types
blanchet@43626
   589
val is_type_enc_fairly_sound = is_type_level_fairly_sound o level_of_type_enc
blanchet@42613
   590
blanchet@43624
   591
fun choose_format formats (Simple_Types (order, level)) =
blanchet@43624
   592
    if member (op =) formats THF then
blanchet@43624
   593
      (THF, Simple_Types (order, level))
blanchet@43624
   594
    else if member (op =) formats TFF then
blanchet@43624
   595
      (TFF, Simple_Types (First_Order, level))
blanchet@43624
   596
    else
blanchet@43624
   597
      choose_format formats (Preds (Mangled_Monomorphic, level, Heavyweight))
blanchet@43626
   598
  | choose_format formats type_enc =
blanchet@43101
   599
    (case hd formats of
blanchet@43101
   600
       CNF_UEQ =>
blanchet@43626
   601
       (CNF_UEQ, case type_enc of
blanchet@43101
   602
                   Preds stuff =>
blanchet@43626
   603
                   (if is_type_enc_fairly_sound type_enc then Tags else Preds)
blanchet@43101
   604
                       stuff
blanchet@43626
   605
                 | _ => type_enc)
blanchet@43626
   606
     | format => (format, type_enc))
blanchet@43101
   607
blanchet@40114
   608
type translated_formula =
blanchet@43496
   609
  {name : string,
blanchet@43496
   610
   locality : locality,
blanchet@43496
   611
   kind : formula_kind,
blanchet@43496
   612
   combformula : (name, typ, combterm) formula,
blanchet@43496
   613
   atomic_types : typ list}
blanchet@38282
   614
blanchet@42640
   615
fun update_combformula f ({name, locality, kind, combformula, atomic_types}
blanchet@42640
   616
                          : translated_formula) =
blanchet@42640
   617
  {name = name, locality = locality, kind = kind, combformula = f combformula,
blanchet@42562
   618
   atomic_types = atomic_types} : translated_formula
blanchet@42542
   619
blanchet@42558
   620
fun fact_lift f ({combformula, ...} : translated_formula) = f combformula
blanchet@42558
   621
blanchet@43064
   622
val type_instance = Sign.typ_instance o Proof_Context.theory_of
blanchet@43064
   623
blanchet@43064
   624
fun insert_type ctxt get_T x xs =
blanchet@43064
   625
  let val T = get_T x in
blanchet@43064
   626
    if exists (curry (type_instance ctxt) T o get_T) xs then xs
blanchet@43064
   627
    else x :: filter_out (curry (type_instance ctxt o swap) T o get_T) xs
blanchet@43064
   628
  end
blanchet@42677
   629
blanchet@42753
   630
(* The Booleans indicate whether all type arguments should be kept. *)
blanchet@42753
   631
datatype type_arg_policy =
blanchet@42753
   632
  Explicit_Type_Args of bool |
blanchet@42753
   633
  Mangled_Type_Args of bool |
blanchet@42753
   634
  No_Type_Args
blanchet@41136
   635
blanchet@42836
   636
fun should_drop_arg_type_args (Simple_Types _) =
blanchet@42836
   637
    false (* since TFF doesn't support overloading *)
blanchet@43626
   638
  | should_drop_arg_type_args type_enc =
blanchet@43626
   639
    level_of_type_enc type_enc = All_Types andalso
blanchet@43626
   640
    heaviness_of_type_enc type_enc = Heavyweight
blanchet@42831
   641
blanchet@43626
   642
fun type_arg_policy type_enc s =
blanchet@43628
   643
  if s = type_tag_name then
blanchet@43626
   644
    (if polymorphism_of_type_enc type_enc = Mangled_Monomorphic then
blanchet@43623
   645
       Mangled_Type_Args
blanchet@43623
   646
     else
blanchet@43623
   647
       Explicit_Type_Args) false
blanchet@43628
   648
  else case type_enc of
blanchet@43628
   649
    Tags (_, All_Types, Heavyweight) => No_Type_Args
blanchet@43628
   650
  | _ =>
blanchet@43628
   651
    if level_of_type_enc type_enc = No_Types orelse
blanchet@43628
   652
       s = @{const_name HOL.eq} orelse
blanchet@43628
   653
       (s = app_op_name andalso
blanchet@43628
   654
        level_of_type_enc type_enc = Const_Arg_Types) then
blanchet@43628
   655
      No_Type_Args
blanchet@43628
   656
    else
blanchet@43628
   657
      should_drop_arg_type_args type_enc
blanchet@43628
   658
      |> (if polymorphism_of_type_enc type_enc = Mangled_Monomorphic then
blanchet@43628
   659
            Mangled_Type_Args
blanchet@43628
   660
          else
blanchet@43628
   661
            Explicit_Type_Args)
blanchet@42227
   662
blanchet@43628
   663
(* Make literals for sorted type variables. *)
blanchet@43263
   664
fun generic_add_sorts_on_type (_, []) = I
blanchet@43263
   665
  | generic_add_sorts_on_type ((x, i), s :: ss) =
blanchet@43263
   666
    generic_add_sorts_on_type ((x, i), ss)
blanchet@43263
   667
    #> (if s = the_single @{sort HOL.type} then
blanchet@43093
   668
          I
blanchet@43093
   669
        else if i = ~1 then
blanchet@43263
   670
          insert (op =) (TyLitFree (`make_type_class s, `make_fixed_type_var x))
blanchet@43093
   671
        else
blanchet@43263
   672
          insert (op =) (TyLitVar (`make_type_class s,
blanchet@43263
   673
                                   (make_schematic_type_var (x, i), x))))
blanchet@43263
   674
fun add_sorts_on_tfree (TFree (s, S)) = generic_add_sorts_on_type ((s, ~1), S)
blanchet@43263
   675
  | add_sorts_on_tfree _ = I
blanchet@43263
   676
fun add_sorts_on_tvar (TVar z) = generic_add_sorts_on_type z
blanchet@43263
   677
  | add_sorts_on_tvar _ = I
blanchet@43085
   678
blanchet@43626
   679
fun type_literals_for_types type_enc add_sorts_on_typ Ts =
blanchet@43626
   680
  [] |> level_of_type_enc type_enc <> No_Types ? fold add_sorts_on_typ Ts
blanchet@41137
   681
blanchet@42534
   682
fun mk_aconns c phis =
blanchet@42534
   683
  let val (phis', phi') = split_last phis in
blanchet@42534
   684
    fold_rev (mk_aconn c) phis' phi'
blanchet@42534
   685
  end
blanchet@38282
   686
fun mk_ahorn [] phi = phi
blanchet@42534
   687
  | mk_ahorn phis psi = AConn (AImplies, [mk_aconns AAnd phis, psi])
blanchet@42522
   688
fun mk_aquant _ [] phi = phi
blanchet@42522
   689
  | mk_aquant q xs (phi as AQuant (q', xs', phi')) =
blanchet@42522
   690
    if q = q' then AQuant (q, xs @ xs', phi') else AQuant (q, xs, phi)
blanchet@42522
   691
  | mk_aquant q xs phi = AQuant (q, xs, phi)
blanchet@38282
   692
blanchet@42522
   693
fun close_universally atom_vars phi =
blanchet@41145
   694
  let
blanchet@41145
   695
    fun formula_vars bounds (AQuant (_, xs, phi)) =
blanchet@42526
   696
        formula_vars (map fst xs @ bounds) phi
blanchet@41145
   697
      | formula_vars bounds (AConn (_, phis)) = fold (formula_vars bounds) phis
blanchet@42522
   698
      | formula_vars bounds (AAtom tm) =
blanchet@42526
   699
        union (op =) (atom_vars tm []
blanchet@42526
   700
                      |> filter_out (member (op =) bounds o fst))
blanchet@42522
   701
  in mk_aquant AForall (formula_vars [] phi []) phi end
blanchet@42522
   702
blanchet@42531
   703
fun combterm_vars (CombApp (tm1, tm2)) = fold combterm_vars [tm1, tm2]
blanchet@42522
   704
  | combterm_vars (CombConst _) = I
blanchet@42574
   705
  | combterm_vars (CombVar (name, T)) = insert (op =) (name, SOME T)
nik@43677
   706
  | combterm_vars (CombAbs (_, tm)) = combterm_vars tm
blanchet@42674
   707
fun close_combformula_universally phi = close_universally combterm_vars phi
blanchet@42522
   708
nik@43676
   709
fun term_vars bounds (ATerm (name as (s, _), tms)) =
nik@43676
   710
    (is_tptp_variable s andalso not (member (op =) bounds name))
nik@43676
   711
    ? insert (op =) (name, NONE) #> fold (term_vars bounds) tms
nik@43676
   712
  | term_vars bounds (AAbs ((name, _), tm)) = term_vars (name :: bounds) tm
nik@43676
   713
fun close_formula_universally phi = close_universally (term_vars []) phi
blanchet@41145
   714
blanchet@42994
   715
val homo_infinite_type_name = @{type_name ind} (* any infinite type *)
blanchet@42994
   716
val homo_infinite_type = Type (homo_infinite_type_name, [])
blanchet@42994
   717
nik@43676
   718
fun ho_term_from_typ format type_enc =
blanchet@42994
   719
  let
blanchet@42994
   720
    fun term (Type (s, Ts)) =
blanchet@43626
   721
      ATerm (case (is_type_enc_higher_order type_enc, s) of
blanchet@42994
   722
               (true, @{type_name bool}) => `I tptp_bool_type
blanchet@42994
   723
             | (true, @{type_name fun}) => `I tptp_fun_type
blanchet@43178
   724
             | _ => if s = homo_infinite_type_name andalso
blanchet@43178
   725
                       (format = TFF orelse format = THF) then
blanchet@43178
   726
                      `I tptp_individual_type
blanchet@43178
   727
                    else
blanchet@43178
   728
                      `make_fixed_type_const s,
blanchet@42994
   729
             map term Ts)
blanchet@42994
   730
    | term (TFree (s, _)) = ATerm (`make_fixed_type_var s, [])
blanchet@42994
   731
    | term (TVar ((x as (s, _)), _)) =
blanchet@42994
   732
      ATerm ((make_schematic_type_var x, s), [])
blanchet@42994
   733
  in term end
blanchet@42562
   734
nik@43676
   735
fun ho_term_for_type_arg format type_enc T =
nik@43676
   736
  if T = dummyT then NONE else SOME (ho_term_from_typ format type_enc T)
blanchet@43401
   737
blanchet@42562
   738
(* This shouldn't clash with anything else. *)
blanchet@42542
   739
val mangled_type_sep = "\000"
blanchet@42542
   740
blanchet@42562
   741
fun generic_mangled_type_name f (ATerm (name, [])) = f name
blanchet@42562
   742
  | generic_mangled_type_name f (ATerm (name, tys)) =
blanchet@42761
   743
    f name ^ "(" ^ space_implode "," (map (generic_mangled_type_name f) tys)
blanchet@42761
   744
    ^ ")"
nik@43676
   745
  | generic_mangled_type_name f _ = raise Fail "unexpected type abstraction"
blanchet@42542
   746
blanchet@42998
   747
val bool_atype = AType (`I tptp_bool_type)
blanchet@42998
   748
blanchet@43085
   749
fun make_simple_type s =
blanchet@43085
   750
  if s = tptp_bool_type orelse s = tptp_fun_type orelse
blanchet@43085
   751
     s = tptp_individual_type then
blanchet@43085
   752
    s
blanchet@43085
   753
  else
blanchet@43085
   754
    simple_type_prefix ^ ascii_of s
blanchet@43085
   755
nik@43676
   756
fun ho_type_from_ho_term type_enc pred_sym ary =
blanchet@42963
   757
  let
blanchet@42963
   758
    fun to_atype ty =
blanchet@42963
   759
      AType ((make_simple_type (generic_mangled_type_name fst ty),
blanchet@42963
   760
              generic_mangled_type_name snd ty))
blanchet@42963
   761
    fun to_afun f1 f2 tys = AFun (f1 (hd tys), f2 (nth tys 1))
blanchet@42998
   762
    fun to_fo 0 ty = if pred_sym then bool_atype else to_atype ty
blanchet@42994
   763
      | to_fo ary (ATerm (_, tys)) = to_afun to_atype (to_fo (ary - 1)) tys
nik@43676
   764
      | to_fo ary _ = raise Fail "unexpected type abstraction"
blanchet@42994
   765
    fun to_ho (ty as ATerm ((s, _), tys)) =
nik@43676
   766
        if s = tptp_fun_type then to_afun to_ho to_ho tys else to_atype ty
nik@43676
   767
      | to_ho _ = raise Fail "unexpected type abstraction"
blanchet@43626
   768
  in if is_type_enc_higher_order type_enc then to_ho else to_fo ary end
blanchet@42963
   769
nik@43677
   770
fun ho_type_from_typ format type_enc pred_sym ary =
nik@43676
   771
  ho_type_from_ho_term type_enc pred_sym ary
nik@43676
   772
  o ho_term_from_typ format type_enc
blanchet@42963
   773
blanchet@43626
   774
fun mangled_const_name format type_enc T_args (s, s') =
blanchet@42963
   775
  let
nik@43676
   776
    val ty_args = T_args |> map_filter (ho_term_for_type_arg format type_enc)
blanchet@42963
   777
    fun type_suffix f g =
blanchet@42963
   778
      fold_rev (curry (op ^) o g o prefix mangled_type_sep
blanchet@42963
   779
                o generic_mangled_type_name f) ty_args ""
blanchet@42963
   780
  in (s ^ type_suffix fst ascii_of, s' ^ type_suffix snd I) end
blanchet@42542
   781
blanchet@42542
   782
val parse_mangled_ident =
blanchet@42542
   783
  Scan.many1 (not o member (op =) ["(", ")", ","]) >> implode
blanchet@42542
   784
blanchet@42542
   785
fun parse_mangled_type x =
blanchet@42542
   786
  (parse_mangled_ident
blanchet@42542
   787
   -- Scan.optional ($$ "(" |-- Scan.optional parse_mangled_types [] --| $$ ")")
blanchet@42542
   788
                    [] >> ATerm) x
blanchet@42542
   789
and parse_mangled_types x =
blanchet@42542
   790
  (parse_mangled_type ::: Scan.repeat ($$ "," |-- parse_mangled_type)) x
blanchet@42542
   791
blanchet@42542
   792
fun unmangled_type s =
blanchet@42542
   793
  s |> suffix ")" |> raw_explode
blanchet@42542
   794
    |> Scan.finite Symbol.stopper
blanchet@42542
   795
           (Scan.error (!! (fn _ => raise Fail ("unrecognized mangled type " ^
blanchet@42542
   796
                                                quote s)) parse_mangled_type))
blanchet@42542
   797
    |> fst
blanchet@42542
   798
blanchet@42561
   799
val unmangled_const_name = space_explode mangled_type_sep #> hd
blanchet@42542
   800
fun unmangled_const s =
blanchet@42542
   801
  let val ss = space_explode mangled_type_sep s in
blanchet@42542
   802
    (hd ss, map unmangled_type (tl ss))
blanchet@42542
   803
  end
blanchet@42542
   804
blanchet@43626
   805
fun introduce_proxies type_enc =
blanchet@42568
   806
  let
blanchet@43017
   807
    fun intro top_level (CombApp (tm1, tm2)) =
blanchet@43017
   808
        CombApp (intro top_level tm1, intro false tm2)
blanchet@43017
   809
      | intro top_level (CombConst (name as (s, _), T, T_args)) =
blanchet@42570
   810
        (case proxify_const s of
blanchet@43159
   811
           SOME proxy_base =>
blanchet@43626
   812
           if top_level orelse is_type_enc_higher_order type_enc then
blanchet@43000
   813
             case (top_level, s) of
blanchet@43000
   814
               (_, "c_False") => (`I tptp_false, [])
blanchet@43000
   815
             | (_, "c_True") => (`I tptp_true, [])
blanchet@43000
   816
             | (false, "c_Not") => (`I tptp_not, [])
blanchet@43000
   817
             | (false, "c_conj") => (`I tptp_and, [])
blanchet@43000
   818
             | (false, "c_disj") => (`I tptp_or, [])
blanchet@43000
   819
             | (false, "c_implies") => (`I tptp_implies, [])
blanchet@43000
   820
             | (false, s) =>
blanchet@43017
   821
               if is_tptp_equal s then (`I tptp_equal, [])
blanchet@43017
   822
               else (proxy_base |>> prefix const_prefix, T_args)
blanchet@43000
   823
             | _ => (name, [])
blanchet@42569
   824
           else
blanchet@42574
   825
             (proxy_base |>> prefix const_prefix, T_args)
blanchet@42574
   826
          | NONE => (name, T_args))
blanchet@42574
   827
        |> (fn (name, T_args) => CombConst (name, T, T_args))
nik@43677
   828
      | intro _ (CombAbs (bound, tm)) = CombAbs (bound, intro false tm)
blanchet@43017
   829
      | intro _ tm = tm
blanchet@43017
   830
  in intro true end
blanchet@42568
   831
blanchet@43626
   832
fun combformula_from_prop thy type_enc eq_as_iff =
blanchet@38282
   833
  let
blanchet@42568
   834
    fun do_term bs t atomic_types =
blanchet@41140
   835
      combterm_from_term thy bs (Envir.eta_contract t)
blanchet@43626
   836
      |>> (introduce_proxies type_enc #> AAtom)
blanchet@42568
   837
      ||> union (op =) atomic_types
blanchet@38282
   838
    fun do_quant bs q s T t' =
wenzelm@43324
   839
      let val s = singleton (Name.variant_list (map fst bs)) s in
blanchet@38518
   840
        do_formula ((s, T) :: bs) t'
blanchet@42562
   841
        #>> mk_aquant q [(`make_bound_var s, SOME T)]
blanchet@38518
   842
      end
blanchet@38282
   843
    and do_conn bs c t1 t2 =
blanchet@43198
   844
      do_formula bs t1 ##>> do_formula bs t2 #>> uncurry (mk_aconn c)
blanchet@38282
   845
    and do_formula bs t =
blanchet@38282
   846
      case t of
blanchet@43096
   847
        @{const Trueprop} $ t1 => do_formula bs t1
blanchet@43096
   848
      | @{const Not} $ t1 => do_formula bs t1 #>> mk_anot
blanchet@38282
   849
      | Const (@{const_name All}, _) $ Abs (s, T, t') =>
blanchet@38282
   850
        do_quant bs AForall s T t'
blanchet@38282
   851
      | Const (@{const_name Ex}, _) $ Abs (s, T, t') =>
blanchet@38282
   852
        do_quant bs AExists s T t'
haftmann@38795
   853
      | @{const HOL.conj} $ t1 $ t2 => do_conn bs AAnd t1 t2
haftmann@38795
   854
      | @{const HOL.disj} $ t1 $ t2 => do_conn bs AOr t1 t2
haftmann@38786
   855
      | @{const HOL.implies} $ t1 $ t2 => do_conn bs AImplies t1 t2
haftmann@38864
   856
      | Const (@{const_name HOL.eq}, Type (_, [@{typ bool}, _])) $ t1 $ t2 =>
blanchet@41140
   857
        if eq_as_iff then do_conn bs AIff t1 t2 else do_term bs t
blanchet@41140
   858
      | _ => do_term bs t
blanchet@38282
   859
  in do_formula [] end
blanchet@38282
   860
blanchet@43264
   861
fun presimplify_term _ [] t = t
blanchet@43264
   862
  | presimplify_term ctxt presimp_consts t =
blanchet@43264
   863
    t |> exists_Const (member (op =) presimp_consts o fst) t
blanchet@43264
   864
         ? (Skip_Proof.make_thm (Proof_Context.theory_of ctxt)
blanchet@43264
   865
            #> Meson.presimplify ctxt
blanchet@43264
   866
            #> prop_of)
blanchet@38282
   867
wenzelm@41491
   868
fun concealed_bound_name j = sledgehammer_weak_prefix ^ string_of_int j
blanchet@38282
   869
fun conceal_bounds Ts t =
blanchet@38282
   870
  subst_bounds (map (Free o apfst concealed_bound_name)
blanchet@38282
   871
                    (0 upto length Ts - 1 ~~ Ts), t)
blanchet@38282
   872
fun reveal_bounds Ts =
blanchet@38282
   873
  subst_atomic (map (fn (j, T) => (Free (concealed_bound_name j, T), Bound j))
blanchet@38282
   874
                    (0 upto length Ts - 1 ~~ Ts))
blanchet@38282
   875
blanchet@43265
   876
fun is_fun_equality (@{const_name HOL.eq},
blanchet@43265
   877
                     Type (_, [Type (@{type_name fun}, _), _])) = true
blanchet@43265
   878
  | is_fun_equality _ = false
blanchet@43265
   879
blanchet@42747
   880
fun extensionalize_term ctxt t =
blanchet@43265
   881
  if exists_Const is_fun_equality t then
blanchet@43265
   882
    let val thy = Proof_Context.theory_of ctxt in
blanchet@43265
   883
      t |> cterm_of thy |> Meson.extensionalize_conv ctxt
blanchet@43265
   884
        |> prop_of |> Logic.dest_equals |> snd
blanchet@43265
   885
    end
blanchet@43265
   886
  else
blanchet@43265
   887
    t
blanchet@38608
   888
blanchet@38282
   889
fun introduce_combinators_in_term ctxt kind t =
wenzelm@42361
   890
  let val thy = Proof_Context.theory_of ctxt in
blanchet@38491
   891
    if Meson.is_fol_term thy t then
blanchet@38491
   892
      t
blanchet@38491
   893
    else
blanchet@38491
   894
      let
blanchet@38491
   895
        fun aux Ts t =
blanchet@38491
   896
          case t of
blanchet@38491
   897
            @{const Not} $ t1 => @{const Not} $ aux Ts t1
blanchet@38491
   898
          | (t0 as Const (@{const_name All}, _)) $ Abs (s, T, t') =>
blanchet@38491
   899
            t0 $ Abs (s, T, aux (T :: Ts) t')
blanchet@38652
   900
          | (t0 as Const (@{const_name All}, _)) $ t1 =>
blanchet@38652
   901
            aux Ts (t0 $ eta_expand Ts t1 1)
blanchet@38491
   902
          | (t0 as Const (@{const_name Ex}, _)) $ Abs (s, T, t') =>
blanchet@38491
   903
            t0 $ Abs (s, T, aux (T :: Ts) t')
blanchet@38652
   904
          | (t0 as Const (@{const_name Ex}, _)) $ t1 =>
blanchet@38652
   905
            aux Ts (t0 $ eta_expand Ts t1 1)
haftmann@38795
   906
          | (t0 as @{const HOL.conj}) $ t1 $ t2 => t0 $ aux Ts t1 $ aux Ts t2
haftmann@38795
   907
          | (t0 as @{const HOL.disj}) $ t1 $ t2 => t0 $ aux Ts t1 $ aux Ts t2
haftmann@38786
   908
          | (t0 as @{const HOL.implies}) $ t1 $ t2 => t0 $ aux Ts t1 $ aux Ts t2
haftmann@38864
   909
          | (t0 as Const (@{const_name HOL.eq}, Type (_, [@{typ bool}, _])))
blanchet@38491
   910
              $ t1 $ t2 =>
blanchet@38491
   911
            t0 $ aux Ts t1 $ aux Ts t2
blanchet@38491
   912
          | _ => if not (exists_subterm (fn Abs _ => true | _ => false) t) then
blanchet@38491
   913
                   t
blanchet@38491
   914
                 else
blanchet@38491
   915
                   t |> conceal_bounds Ts
blanchet@38491
   916
                     |> Envir.eta_contract
blanchet@38491
   917
                     |> cterm_of thy
blanchet@39890
   918
                     |> Meson_Clausify.introduce_combinators_in_cterm
blanchet@38491
   919
                     |> prop_of |> Logic.dest_equals |> snd
blanchet@38491
   920
                     |> reveal_bounds Ts
blanchet@39370
   921
        val (t, ctxt') = Variable.import_terms true [t] ctxt |>> the_single
blanchet@38491
   922
      in t |> aux [] |> singleton (Variable.export_terms ctxt' ctxt) end
blanchet@38491
   923
      handle THM _ =>
blanchet@38491
   924
             (* A type variable of sort "{}" will make abstraction fail. *)
blanchet@38613
   925
             if kind = Conjecture then HOLogic.false_const
blanchet@38613
   926
             else HOLogic.true_const
blanchet@38491
   927
  end
blanchet@38282
   928
blanchet@38282
   929
(* Metis's use of "resolve_tac" freezes the schematic variables. We simulate the
blanchet@42353
   930
   same in Sledgehammer to prevent the discovery of unreplayable proofs. *)
blanchet@38282
   931
fun freeze_term t =
blanchet@38282
   932
  let
blanchet@38282
   933
    fun aux (t $ u) = aux t $ aux u
blanchet@38282
   934
      | aux (Abs (s, T, t)) = Abs (s, T, aux t)
blanchet@38282
   935
      | aux (Var ((s, i), T)) =
blanchet@38282
   936
        Free (sledgehammer_weak_prefix ^ s ^ "_" ^ string_of_int i, T)
blanchet@38282
   937
      | aux t = t
blanchet@38282
   938
  in t |> exists_subterm is_Var t ? aux end
blanchet@38282
   939
nik@43677
   940
fun preprocess_prop ctxt type_enc presimp_consts kind t =
blanchet@38282
   941
  let
wenzelm@42361
   942
    val thy = Proof_Context.theory_of ctxt
blanchet@38608
   943
    val t = t |> Envir.beta_eta_contract
blanchet@42944
   944
              |> transform_elim_prop
blanchet@41211
   945
              |> Object_Logic.atomize_term thy
blanchet@42563
   946
    val need_trueprop = (fastype_of t = @{typ bool})
blanchet@43096
   947
  in
blanchet@43096
   948
    t |> need_trueprop ? HOLogic.mk_Trueprop
blanchet@43096
   949
      |> Raw_Simplifier.rewrite_term thy (Meson.unfold_set_const_simps ctxt) []
blanchet@43096
   950
      |> extensionalize_term ctxt
blanchet@43264
   951
      |> presimplify_term ctxt presimp_consts
blanchet@43120
   952
      |> perhaps (try (HOLogic.dest_Trueprop))
nik@43677
   953
      |> not (is_type_enc_higher_order type_enc)
nik@43677
   954
         ? introduce_combinators_in_term ctxt kind
blanchet@43096
   955
  end
blanchet@43096
   956
blanchet@43096
   957
(* making fact and conjecture formulas *)
blanchet@43626
   958
fun make_formula thy type_enc eq_as_iff name loc kind t =
blanchet@43096
   959
  let
blanchet@42962
   960
    val (combformula, atomic_types) =
blanchet@43626
   961
      combformula_from_prop thy type_enc eq_as_iff t []
blanchet@38282
   962
  in
blanchet@42640
   963
    {name = name, locality = loc, kind = kind, combformula = combformula,
blanchet@42562
   964
     atomic_types = atomic_types}
blanchet@38282
   965
  end
blanchet@38282
   966
blanchet@43626
   967
fun make_fact ctxt format type_enc eq_as_iff preproc presimp_consts
blanchet@42994
   968
              ((name, loc), t) =
blanchet@43096
   969
  let val thy = Proof_Context.theory_of ctxt in
nik@43677
   970
    case t |> preproc ? preprocess_prop ctxt type_enc presimp_consts Axiom
blanchet@43626
   971
           |> make_formula thy type_enc (eq_as_iff andalso format <> CNF) name
blanchet@43624
   972
                           loc Axiom of
blanchet@43295
   973
      formula as {combformula = AAtom (CombConst ((s, _), _, _)), ...} =>
blanchet@43096
   974
      if s = tptp_true then NONE else SOME formula
blanchet@43295
   975
    | formula => SOME formula
blanchet@43096
   976
  end
blanchet@42561
   977
blanchet@43626
   978
fun make_conjecture ctxt format prem_kind type_enc preproc presimp_consts ts =
blanchet@43096
   979
  let
blanchet@43096
   980
    val thy = Proof_Context.theory_of ctxt
blanchet@43096
   981
    val last = length ts - 1
blanchet@43096
   982
  in
blanchet@42709
   983
    map2 (fn j => fn t =>
blanchet@42709
   984
             let
blanchet@42709
   985
               val (kind, maybe_negate) =
blanchet@42709
   986
                 if j = last then
blanchet@42709
   987
                   (Conjecture, I)
blanchet@42709
   988
                 else
blanchet@42709
   989
                   (prem_kind,
blanchet@42709
   990
                    if prem_kind = Conjecture then update_combformula mk_anot
blanchet@42709
   991
                    else I)
blanchet@42709
   992
              in
blanchet@43264
   993
                t |> preproc ?
nik@43677
   994
                     (preprocess_prop ctxt type_enc presimp_consts kind #> freeze_term)
blanchet@43626
   995
                  |> make_formula thy type_enc (format <> CNF) (string_of_int j)
blanchet@43624
   996
                                  Local kind
blanchet@42962
   997
                  |> maybe_negate
blanchet@42709
   998
              end)
blanchet@38613
   999
         (0 upto last) ts
blanchet@38613
  1000
  end
blanchet@38282
  1001
blanchet@42682
  1002
(** Finite and infinite type inference **)
blanchet@42682
  1003
blanchet@42886
  1004
fun deep_freeze_atyp (TVar (_, S)) = TFree ("v", S)
blanchet@42886
  1005
  | deep_freeze_atyp T = T
blanchet@42886
  1006
val deep_freeze_type = map_atyps deep_freeze_atyp
blanchet@42886
  1007
blanchet@42682
  1008
(* Finite types such as "unit", "bool", "bool * bool", and "bool => bool" are
blanchet@42682
  1009
   dangerous because their "exhaust" properties can easily lead to unsound ATP
blanchet@42682
  1010
   proofs. On the other hand, all HOL infinite types can be given the same
blanchet@42682
  1011
   models in first-order logic (via Löwenheim-Skolem). *)
blanchet@42682
  1012
blanchet@42886
  1013
fun should_encode_type ctxt (nonmono_Ts as _ :: _) _ T =
blanchet@42886
  1014
    exists (curry (type_instance ctxt) (deep_freeze_type T)) nonmono_Ts
blanchet@42836
  1015
  | should_encode_type _ _ All_Types _ = true
blanchet@43572
  1016
  | should_encode_type ctxt _ Fin_Nonmono_Types T =
blanchet@43572
  1017
    is_type_surely_finite ctxt false T
blanchet@42682
  1018
  | should_encode_type _ _ _ _ = false
blanchet@42682
  1019
blanchet@42837
  1020
fun should_predicate_on_type ctxt nonmono_Ts (Preds (_, level, heaviness))
blanchet@42834
  1021
                             should_predicate_on_var T =
blanchet@43128
  1022
    (heaviness = Heavyweight orelse should_predicate_on_var ()) andalso
blanchet@42878
  1023
    should_encode_type ctxt nonmono_Ts level T
blanchet@42834
  1024
  | should_predicate_on_type _ _ _ _ _ = false
blanchet@42682
  1025
blanchet@42836
  1026
fun is_var_or_bound_var (CombConst ((s, _), _, _)) =
blanchet@42836
  1027
    String.isPrefix bound_var_prefix s
blanchet@42836
  1028
  | is_var_or_bound_var (CombVar _) = true
blanchet@42836
  1029
  | is_var_or_bound_var _ = false
blanchet@42836
  1030
blanchet@43361
  1031
datatype tag_site =
blanchet@43361
  1032
  Top_Level of bool option |
blanchet@43361
  1033
  Eq_Arg of bool option |
blanchet@43361
  1034
  Elsewhere
blanchet@42829
  1035
blanchet@43361
  1036
fun should_tag_with_type _ _ _ (Top_Level _) _ _ = false
blanchet@43361
  1037
  | should_tag_with_type ctxt nonmono_Ts (Tags (poly, level, heaviness)) site
blanchet@43361
  1038
                         u T =
blanchet@42837
  1039
    (case heaviness of
blanchet@43128
  1040
       Heavyweight => should_encode_type ctxt nonmono_Ts level T
blanchet@43128
  1041
     | Lightweight =>
blanchet@42836
  1042
       case (site, is_var_or_bound_var u) of
blanchet@43361
  1043
         (Eq_Arg pos, true) =>
blanchet@43361
  1044
         (* The first disjunct prevents a subtle soundness issue explained in
blanchet@43361
  1045
            Blanchette's Ph.D. thesis. See also
blanchet@43361
  1046
            "formula_lines_for_lightweight_tags_sym_decl". *)
blanchet@43361
  1047
         (pos <> SOME false andalso poly = Polymorphic andalso
blanchet@43361
  1048
          level <> All_Types andalso heaviness = Lightweight andalso
blanchet@43361
  1049
          exists (fn T' => type_instance ctxt (T', T)) nonmono_Ts) orelse
blanchet@43361
  1050
         should_encode_type ctxt nonmono_Ts level T
blanchet@42829
  1051
       | _ => false)
blanchet@42829
  1052
  | should_tag_with_type _ _ _ _ _ _ = false
blanchet@42682
  1053
blanchet@42994
  1054
fun homogenized_type ctxt nonmono_Ts level =
blanchet@42994
  1055
  let
blanchet@42994
  1056
    val should_encode = should_encode_type ctxt nonmono_Ts level
blanchet@42994
  1057
    fun homo 0 T = if should_encode T then T else homo_infinite_type
blanchet@42994
  1058
      | homo ary (Type (@{type_name fun}, [T1, T2])) =
blanchet@42994
  1059
        homo 0 T1 --> homo (ary - 1) T2
blanchet@42994
  1060
      | homo _ _ = raise Fail "expected function type"
blanchet@42994
  1061
  in homo end
blanchet@42682
  1062
blanchet@42573
  1063
(** "hBOOL" and "hAPP" **)
blanchet@41313
  1064
blanchet@42574
  1065
type sym_info =
blanchet@43064
  1066
  {pred_sym : bool, min_ary : int, max_ary : int, types : typ list}
blanchet@42563
  1067
blanchet@43064
  1068
fun add_combterm_syms_to_table ctxt explicit_apply =
blanchet@42558
  1069
  let
blanchet@43064
  1070
    fun consider_var_arity const_T var_T max_ary =
blanchet@43064
  1071
      let
blanchet@43064
  1072
        fun iter ary T =
blanchet@43210
  1073
          if ary = max_ary orelse type_instance ctxt (var_T, T) orelse
blanchet@43210
  1074
             type_instance ctxt (T, var_T) then
blanchet@43210
  1075
            ary
blanchet@43210
  1076
          else
blanchet@43210
  1077
            iter (ary + 1) (range_type T)
blanchet@43064
  1078
      in iter 0 const_T end
blanchet@43201
  1079
    fun add_var_or_bound_var T (accum as ((bool_vars, fun_var_Ts), sym_tab)) =
blanchet@43201
  1080
      if explicit_apply = NONE andalso
blanchet@43201
  1081
         (can dest_funT T orelse T = @{typ bool}) then
blanchet@43201
  1082
        let
blanchet@43201
  1083
          val bool_vars' = bool_vars orelse body_type T = @{typ bool}
blanchet@43201
  1084
          fun repair_min_arity {pred_sym, min_ary, max_ary, types} =
blanchet@43201
  1085
            {pred_sym = pred_sym andalso not bool_vars',
blanchet@43213
  1086
             min_ary = fold (fn T' => consider_var_arity T' T) types min_ary,
blanchet@43201
  1087
             max_ary = max_ary, types = types}
blanchet@43201
  1088
          val fun_var_Ts' =
blanchet@43201
  1089
            fun_var_Ts |> can dest_funT T ? insert_type ctxt I T
blanchet@43201
  1090
        in
blanchet@43201
  1091
          if bool_vars' = bool_vars andalso
blanchet@43201
  1092
             pointer_eq (fun_var_Ts', fun_var_Ts) then
blanchet@43201
  1093
            accum
blanchet@43167
  1094
          else
blanchet@43213
  1095
            ((bool_vars', fun_var_Ts'), Symtab.map (K repair_min_arity) sym_tab)
blanchet@43201
  1096
        end
blanchet@43201
  1097
      else
blanchet@43201
  1098
        accum
blanchet@43201
  1099
    fun add top_level tm (accum as ((bool_vars, fun_var_Ts), sym_tab)) =
blanchet@43201
  1100
      let val (head, args) = strip_combterm_comb tm in
blanchet@42558
  1101
        (case head of
blanchet@42563
  1102
           CombConst ((s, _), T, _) =>
blanchet@42558
  1103
           if String.isPrefix bound_var_prefix s then
blanchet@43201
  1104
             add_var_or_bound_var T accum
blanchet@42558
  1105
           else
blanchet@43139
  1106
             let val ary = length args in
blanchet@43201
  1107
               ((bool_vars, fun_var_Ts),
blanchet@43064
  1108
                case Symtab.lookup sym_tab s of
blanchet@43064
  1109
                  SOME {pred_sym, min_ary, max_ary, types} =>
blanchet@43064
  1110
                  let
blanchet@43201
  1111
                    val pred_sym =
blanchet@43201
  1112
                      pred_sym andalso top_level andalso not bool_vars
blanchet@43064
  1113
                    val types' = types |> insert_type ctxt I T
blanchet@43064
  1114
                    val min_ary =
blanchet@43064
  1115
                      if is_some explicit_apply orelse
blanchet@43064
  1116
                         pointer_eq (types', types) then
blanchet@43064
  1117
                        min_ary
blanchet@43064
  1118
                      else
blanchet@43201
  1119
                        fold (consider_var_arity T) fun_var_Ts min_ary
blanchet@43064
  1120
                  in
blanchet@43201
  1121
                    Symtab.update (s, {pred_sym = pred_sym,
blanchet@43064
  1122
                                       min_ary = Int.min (ary, min_ary),
blanchet@43064
  1123
                                       max_ary = Int.max (ary, max_ary),
blanchet@43064
  1124
                                       types = types'})
blanchet@43064
  1125
                                  sym_tab
blanchet@43064
  1126
                  end
blanchet@43064
  1127
                | NONE =>
blanchet@43064
  1128
                  let
blanchet@43201
  1129
                    val pred_sym = top_level andalso not bool_vars
blanchet@43064
  1130
                    val min_ary =
blanchet@43064
  1131
                      case explicit_apply of
blanchet@43064
  1132
                        SOME true => 0
blanchet@43064
  1133
                      | SOME false => ary
blanchet@43201
  1134
                      | NONE => fold (consider_var_arity T) fun_var_Ts ary
blanchet@43064
  1135
                  in
blanchet@43201
  1136
                    Symtab.update_new (s, {pred_sym = pred_sym,
blanchet@43064
  1137
                                           min_ary = min_ary, max_ary = ary,
blanchet@43064
  1138
                                           types = [T]})
blanchet@43064
  1139
                                      sym_tab
blanchet@43064
  1140
                  end)
blanchet@43064
  1141
             end
blanchet@43201
  1142
         | CombVar (_, T) => add_var_or_bound_var T accum
blanchet@43064
  1143
         | _ => accum)
blanchet@43064
  1144
        |> fold (add false) args
blanchet@42558
  1145
      end
blanchet@43064
  1146
  in add true end
blanchet@43064
  1147
fun add_fact_syms_to_table ctxt explicit_apply =
blanchet@43064
  1148
  fact_lift (formula_fold NONE
blanchet@43064
  1149
                          (K (add_combterm_syms_to_table ctxt explicit_apply)))
blanchet@38282
  1150
blanchet@43139
  1151
val default_sym_tab_entries : (string * sym_info) list =
blanchet@43174
  1152
  (prefixed_predicator_name,
blanchet@43139
  1153
   {pred_sym = true, min_ary = 1, max_ary = 1, types = []}) ::
blanchet@42568
  1154
  ([tptp_false, tptp_true]
blanchet@43139
  1155
   |> map (rpair {pred_sym = true, min_ary = 0, max_ary = 0, types = []})) @
blanchet@43139
  1156
  ([tptp_equal, tptp_old_equal]
blanchet@43139
  1157
   |> map (rpair {pred_sym = true, min_ary = 2, max_ary = 2, types = []}))
blanchet@41140
  1158
blanchet@43064
  1159
fun sym_table_for_facts ctxt explicit_apply facts =
blanchet@43201
  1160
  ((false, []), Symtab.empty)
blanchet@43201
  1161
  |> fold (add_fact_syms_to_table ctxt explicit_apply) facts |> snd
blanchet@43139
  1162
  |> fold Symtab.update default_sym_tab_entries
blanchet@38282
  1163
blanchet@42558
  1164
fun min_arity_of sym_tab s =
blanchet@42558
  1165
  case Symtab.lookup sym_tab s of
blanchet@42574
  1166
    SOME ({min_ary, ...} : sym_info) => min_ary
blanchet@42558
  1167
  | NONE =>
blanchet@42558
  1168
    case strip_prefix_and_unascii const_prefix s of
blanchet@42547
  1169
      SOME s =>
blanchet@42570
  1170
      let val s = s |> unmangled_const_name |> invert_const in
blanchet@42966
  1171
        if s = predicator_name then 1
blanchet@42966
  1172
        else if s = app_op_name then 2
blanchet@42966
  1173
        else if s = type_pred_name then 1
blanchet@42557
  1174
        else 0
blanchet@42547
  1175
      end
blanchet@42544
  1176
    | NONE => 0
blanchet@38282
  1177
blanchet@38282
  1178
(* True if the constant ever appears outside of the top-level position in
blanchet@38282
  1179
   literals, or if it appears with different arities (e.g., because of different
blanchet@38282
  1180
   type instantiations). If false, the constant always receives all of its
blanchet@38282
  1181
   arguments and is used as a predicate. *)
blanchet@42558
  1182
fun is_pred_sym sym_tab s =
blanchet@42558
  1183
  case Symtab.lookup sym_tab s of
blanchet@42574
  1184
    SOME ({pred_sym, min_ary, max_ary, ...} : sym_info) =>
blanchet@42574
  1185
    pred_sym andalso min_ary = max_ary
blanchet@42558
  1186
  | NONE => false
blanchet@38282
  1187
blanchet@42568
  1188
val predicator_combconst =
blanchet@42966
  1189
  CombConst (`make_fixed_const predicator_name, @{typ "bool => bool"}, [])
blanchet@42568
  1190
fun predicator tm = CombApp (predicator_combconst, tm)
blanchet@42542
  1191
blanchet@42568
  1192
fun introduce_predicators_in_combterm sym_tab tm =
blanchet@42542
  1193
  case strip_combterm_comb tm of
blanchet@42542
  1194
    (CombConst ((s, _), _, _), _) =>
blanchet@42568
  1195
    if is_pred_sym sym_tab s then tm else predicator tm
blanchet@42568
  1196
  | _ => predicator tm
blanchet@42542
  1197
blanchet@42544
  1198
fun list_app head args = fold (curry (CombApp o swap)) args head
blanchet@42544
  1199
blanchet@43130
  1200
val app_op = `make_fixed_const app_op_name
blanchet@43130
  1201
blanchet@42544
  1202
fun explicit_app arg head =
blanchet@42544
  1203
  let
blanchet@42562
  1204
    val head_T = combtyp_of head
blanchet@42693
  1205
    val (arg_T, res_T) = dest_funT head_T
blanchet@42544
  1206
    val explicit_app =
blanchet@43130
  1207
      CombConst (app_op, head_T --> head_T, [arg_T, res_T])
blanchet@42544
  1208
  in list_app explicit_app [head, arg] end
blanchet@42544
  1209
fun list_explicit_app head args = fold explicit_app args head
blanchet@38282
  1210
blanchet@42565
  1211
fun introduce_explicit_apps_in_combterm sym_tab =
blanchet@42544
  1212
  let
blanchet@42544
  1213
    fun aux tm =
blanchet@42544
  1214
      case strip_combterm_comb tm of
blanchet@42544
  1215
        (head as CombConst ((s, _), _, _), args) =>
blanchet@42544
  1216
        args |> map aux
blanchet@42557
  1217
             |> chop (min_arity_of sym_tab s)
blanchet@42544
  1218
             |>> list_app head
blanchet@42544
  1219
             |-> list_explicit_app
blanchet@42544
  1220
      | (head, args) => list_explicit_app head (map aux args)
blanchet@42544
  1221
  in aux end
blanchet@38282
  1222
blanchet@42753
  1223
fun chop_fun 0 T = ([], T)
blanchet@42753
  1224
  | chop_fun n (Type (@{type_name fun}, [dom_T, ran_T])) =
blanchet@42753
  1225
    chop_fun (n - 1) ran_T |>> cons dom_T
blanchet@42753
  1226
  | chop_fun _ _ = raise Fail "unexpected non-function"
blanchet@42753
  1227
blanchet@42780
  1228
fun filter_type_args _ _ _ [] = []
blanchet@42780
  1229
  | filter_type_args thy s arity T_args =
blanchet@42834
  1230
    let
blanchet@42834
  1231
      (* will throw "TYPE" for pseudo-constants *)
blanchet@42966
  1232
      val U = if s = app_op_name then
blanchet@42834
  1233
                @{typ "('a => 'b) => 'a => 'b"} |> Logic.varifyT_global
blanchet@42834
  1234
              else
blanchet@42834
  1235
                s |> Sign.the_const_type thy
blanchet@42834
  1236
    in
blanchet@42781
  1237
      case Term.add_tvarsT (U |> chop_fun arity |> snd) [] of
blanchet@42781
  1238
        [] => []
blanchet@42781
  1239
      | res_U_vars =>
blanchet@42781
  1240
        let val U_args = (s, U) |> Sign.const_typargs thy in
blanchet@42781
  1241
          U_args ~~ T_args
blanchet@43401
  1242
          |> map (fn (U, T) =>
blanchet@43401
  1243
                     if member (op =) res_U_vars (dest_TVar U) then T
blanchet@43401
  1244
                     else dummyT)
blanchet@42781
  1245
        end
blanchet@42780
  1246
    end
blanchet@42780
  1247
    handle TYPE _ => T_args
blanchet@42753
  1248
blanchet@43626
  1249
fun enforce_type_arg_policy_in_combterm ctxt format type_enc =
blanchet@42753
  1250
  let
blanchet@42753
  1251
    val thy = Proof_Context.theory_of ctxt
blanchet@42753
  1252
    fun aux arity (CombApp (tm1, tm2)) =
blanchet@42753
  1253
        CombApp (aux (arity + 1) tm1, aux 0 tm2)
blanchet@42753
  1254
      | aux arity (CombConst (name as (s, _), T, T_args)) =
blanchet@43179
  1255
        (case strip_prefix_and_unascii const_prefix s of
blanchet@43179
  1256
           NONE => (name, T_args)
blanchet@43179
  1257
         | SOME s'' =>
blanchet@43179
  1258
           let
blanchet@43179
  1259
             val s'' = invert_const s''
blanchet@43179
  1260
             fun filtered_T_args false = T_args
blanchet@43179
  1261
               | filtered_T_args true = filter_type_args thy s'' arity T_args
blanchet@43179
  1262
           in
blanchet@43626
  1263
             case type_arg_policy type_enc s'' of
blanchet@43179
  1264
               Explicit_Type_Args drop_args =>
blanchet@43179
  1265
               (name, filtered_T_args drop_args)
blanchet@43179
  1266
             | Mangled_Type_Args drop_args =>
blanchet@43626
  1267
               (mangled_const_name format type_enc (filtered_T_args drop_args)
blanchet@43179
  1268
                                   name, [])
blanchet@43179
  1269
             | No_Type_Args => (name, [])
blanchet@43179
  1270
           end)
blanchet@43179
  1271
        |> (fn (name, T_args) => CombConst (name, T, T_args))
nik@43677
  1272
      | aux _ (CombAbs (bound, tm)) = CombAbs (bound, aux 0 tm)
blanchet@42753
  1273
      | aux _ tm = tm
blanchet@42753
  1274
  in aux 0 end
blanchet@42573
  1275
blanchet@43626
  1276
fun repair_combterm ctxt format type_enc sym_tab =
blanchet@43626
  1277
  not (is_type_enc_higher_order type_enc)
blanchet@42994
  1278
  ? (introduce_explicit_apps_in_combterm sym_tab
blanchet@42994
  1279
     #> introduce_predicators_in_combterm sym_tab)
blanchet@43626
  1280
  #> enforce_type_arg_policy_in_combterm ctxt format type_enc
blanchet@43626
  1281
fun repair_fact ctxt format type_enc sym_tab =
blanchet@42701
  1282
  update_combformula (formula_map
blanchet@43626
  1283
      (repair_combterm ctxt format type_enc sym_tab))
blanchet@42573
  1284
blanchet@42573
  1285
(** Helper facts **)
blanchet@42573
  1286
blanchet@43194
  1287
(* The Boolean indicates that a fairly sound type encoding is needed. *)
blanchet@43085
  1288
val helper_table =
blanchet@43194
  1289
  [(("COMBI", false), @{thms Meson.COMBI_def}),
blanchet@43194
  1290
   (("COMBK", false), @{thms Meson.COMBK_def}),
blanchet@43194
  1291
   (("COMBB", false), @{thms Meson.COMBB_def}),
blanchet@43194
  1292
   (("COMBC", false), @{thms Meson.COMBC_def}),
blanchet@43194
  1293
   (("COMBS", false), @{thms Meson.COMBS_def}),
blanchet@43194
  1294
   (("fequal", true),
blanchet@43085
  1295
    (* This is a lie: Higher-order equality doesn't need a sound type encoding.
blanchet@43085
  1296
       However, this is done so for backward compatibility: Including the
blanchet@43085
  1297
       equality helpers by default in Metis breaks a few existing proofs. *)
blanchet@43194
  1298
    @{thms fequal_def [THEN Meson.iff_to_disjD, THEN conjunct1]
blanchet@43194
  1299
           fequal_def [THEN Meson.iff_to_disjD, THEN conjunct2]}),
blanchet@43194
  1300
   (("fFalse", false), [@{lemma "~ fFalse" by (unfold fFalse_def) fast}]),
blanchet@43194
  1301
   (("fFalse", true), @{thms True_or_False}),
blanchet@43194
  1302
   (("fTrue", false), [@{lemma "fTrue" by (unfold fTrue_def) fast}]),
blanchet@43194
  1303
   (("fTrue", true), @{thms True_or_False}),
blanchet@43194
  1304
   (("fNot", false),
blanchet@43194
  1305
    @{thms fNot_def [THEN Meson.iff_to_disjD, THEN conjunct1]
blanchet@43194
  1306
           fNot_def [THEN Meson.iff_to_disjD, THEN conjunct2]}),
blanchet@43194
  1307
   (("fconj", false),
blanchet@43194
  1308
    @{lemma "~ P | ~ Q | fconj P Q" "~ fconj P Q | P" "~ fconj P Q | Q"
blanchet@43194
  1309
        by (unfold fconj_def) fast+}),
blanchet@43194
  1310
   (("fdisj", false),
blanchet@43194
  1311
    @{lemma "~ P | fdisj P Q" "~ Q | fdisj P Q" "~ fdisj P Q | P | Q"
blanchet@43194
  1312
        by (unfold fdisj_def) fast+}),
blanchet@43194
  1313
   (("fimplies", false),
blanchet@43210
  1314
    @{lemma "P | fimplies P Q" "~ Q | fimplies P Q" "~ fimplies P Q | ~ P | Q"
blanchet@43194
  1315
        by (unfold fimplies_def) fast+}),
blanchet@43194
  1316
   (("If", true), @{thms if_True if_False True_or_False})]
blanchet@43194
  1317
  |> map (apsnd (map zero_var_indexes))
blanchet@43085
  1318
blanchet@43130
  1319
val type_tag = `make_fixed_const type_tag_name
blanchet@43130
  1320
blanchet@43159
  1321
fun type_tag_idempotence_fact () =
blanchet@42573
  1322
  let
blanchet@42573
  1323
    fun var s = ATerm (`I s, [])
blanchet@43159
  1324
    fun tag tm = ATerm (type_tag, [var "T", tm])
blanchet@43207
  1325
    val tagged_a = tag (var "A")
blanchet@42573
  1326
  in
blanchet@43159
  1327
    Formula (type_tag_idempotence_helper_name, Axiom,
blanchet@43207
  1328
             AAtom (ATerm (`I tptp_equal, [tag tagged_a, tagged_a]))
blanchet@42879
  1329
             |> close_formula_universally, simp_info, NONE)
blanchet@42573
  1330
  end
blanchet@42573
  1331
blanchet@43626
  1332
fun should_specialize_helper type_enc t =
blanchet@43628
  1333
  polymorphism_of_type_enc type_enc = Mangled_Monomorphic andalso
blanchet@43628
  1334
  level_of_type_enc type_enc <> No_Types andalso
blanchet@43628
  1335
  not (null (Term.hidden_polymorphism t))
blanchet@43159
  1336
blanchet@43626
  1337
fun helper_facts_for_sym ctxt format type_enc (s, {types, ...} : sym_info) =
blanchet@42573
  1338
  case strip_prefix_and_unascii const_prefix s of
blanchet@42573
  1339
    SOME mangled_s =>
blanchet@42573
  1340
    let
blanchet@42573
  1341
      val thy = Proof_Context.theory_of ctxt
blanchet@42573
  1342
      val unmangled_s = mangled_s |> unmangled_const_name
blanchet@43628
  1343
      fun dub needs_fairly_sound j k =
blanchet@43628
  1344
        (unmangled_s ^ "_" ^ string_of_int j ^ "_" ^ string_of_int k ^
blanchet@43628
  1345
         (if mangled_s = unmangled_s then "" else "_" ^ ascii_of mangled_s) ^
blanchet@43628
  1346
         (if needs_fairly_sound then typed_helper_suffix
blanchet@43628
  1347
          else untyped_helper_suffix),
blanchet@43628
  1348
         Helper)
blanchet@43159
  1349
      fun dub_and_inst needs_fairly_sound (th, j) =
blanchet@43628
  1350
        let val t = prop_of th in
blanchet@43628
  1351
          if should_specialize_helper type_enc t then
blanchet@43628
  1352
            map (fn T => specialize_type thy (invert_const unmangled_s, T) t)
blanchet@43628
  1353
                types
blanchet@43628
  1354
          else
blanchet@43628
  1355
            [t]
blanchet@43628
  1356
        end
blanchet@43628
  1357
        |> map (fn (k, t) => (dub needs_fairly_sound j k, t)) o tag_list 1
blanchet@43159
  1358
      val make_facts =
blanchet@43626
  1359
        map_filter (make_fact ctxt format type_enc false false [])
blanchet@43626
  1360
      val fairly_sound = is_type_enc_fairly_sound type_enc
blanchet@42573
  1361
    in
blanchet@43085
  1362
      helper_table
blanchet@43194
  1363
      |> maps (fn ((helper_s, needs_fairly_sound), ths) =>
blanchet@43159
  1364
                  if helper_s <> unmangled_s orelse
blanchet@42894
  1365
                     (needs_fairly_sound andalso not fairly_sound) then
blanchet@42573
  1366
                    []
blanchet@42573
  1367
                  else
blanchet@42573
  1368
                    ths ~~ (1 upto length ths)
blanchet@43628
  1369
                    |> maps (dub_and_inst needs_fairly_sound)
blanchet@43159
  1370
                    |> make_facts)
blanchet@42573
  1371
    end
blanchet@42573
  1372
  | NONE => []
blanchet@43626
  1373
fun helper_facts_for_sym_table ctxt format type_enc sym_tab =
blanchet@43626
  1374
  Symtab.fold_rev (append o helper_facts_for_sym ctxt format type_enc) sym_tab
blanchet@42962
  1375
                  []
blanchet@42573
  1376
blanchet@43085
  1377
(***************************************************************)
blanchet@43085
  1378
(* Type Classes Present in the Axiom or Conjecture Clauses     *)
blanchet@43085
  1379
(***************************************************************)
blanchet@43085
  1380
blanchet@43085
  1381
fun set_insert (x, s) = Symtab.update (x, ()) s
blanchet@43085
  1382
blanchet@43085
  1383
fun add_classes (sorts, cset) = List.foldl set_insert cset (flat sorts)
blanchet@43085
  1384
blanchet@43085
  1385
(* Remove this trivial type class (FIXME: similar code elsewhere) *)
blanchet@43085
  1386
fun delete_type cset = Symtab.delete_safe (the_single @{sort HOL.type}) cset
blanchet@43085
  1387
blanchet@43093
  1388
fun classes_of_terms get_Ts =
blanchet@43121
  1389
  map (map snd o get_Ts)
blanchet@43093
  1390
  #> List.foldl add_classes Symtab.empty
blanchet@43093
  1391
  #> delete_type #> Symtab.keys
blanchet@43085
  1392
blanchet@43093
  1393
val tfree_classes_of_terms = classes_of_terms OldTerm.term_tfrees
blanchet@43093
  1394
val tvar_classes_of_terms = classes_of_terms OldTerm.term_tvars
blanchet@43085
  1395
blanchet@43622
  1396
fun fold_type_constrs f (Type (s, Ts)) x =
blanchet@43622
  1397
    fold (fold_type_constrs f) Ts (f (s, x))
blanchet@43189
  1398
  | fold_type_constrs _ _ x = x
blanchet@43085
  1399
blanchet@43085
  1400
(*Type constructors used to instantiate overloaded constants are the only ones needed.*)
blanchet@43189
  1401
fun add_type_constrs_in_term thy =
blanchet@43085
  1402
  let
blanchet@43188
  1403
    fun add (Const (@{const_name Meson.skolem}, _) $ _) = I
blanchet@43181
  1404
      | add (t $ u) = add t #> add u
blanchet@43188
  1405
      | add (Const (x as (s, _))) =
blanchet@43188
  1406
        if String.isPrefix skolem_const_prefix s then I
blanchet@43189
  1407
        else x |> Sign.const_typargs thy |> fold (fold_type_constrs set_insert)
blanchet@43181
  1408
      | add (Abs (_, _, u)) = add u
blanchet@43181
  1409
      | add _ = I
blanchet@43181
  1410
  in add end
blanchet@43085
  1411
blanchet@43189
  1412
fun type_constrs_of_terms thy ts =
blanchet@43189
  1413
  Symtab.keys (fold (add_type_constrs_in_term thy) ts Symtab.empty)
blanchet@43085
  1414
blanchet@43626
  1415
fun translate_formulas ctxt format prem_kind type_enc preproc hyp_ts concl_t
blanchet@43214
  1416
                       facts =
blanchet@42573
  1417
  let
blanchet@42573
  1418
    val thy = Proof_Context.theory_of ctxt
blanchet@43222
  1419
    val fact_ts = facts |> map snd
blanchet@43264
  1420
    val presimp_consts = Meson.presimplified_consts ctxt
blanchet@43626
  1421
    val make_fact = make_fact ctxt format type_enc true preproc presimp_consts
blanchet@42573
  1422
    val (facts, fact_names) =
blanchet@43264
  1423
      facts |> map (fn (name, t) => (name, t) |> make_fact |> rpair name)
blanchet@43214
  1424
            |> map_filter (try (apfst the))
blanchet@43214
  1425
            |> ListPair.unzip
blanchet@42573
  1426
    (* Remove existing facts from the conjecture, as this can dramatically
blanchet@42573
  1427
       boost an ATP's performance (for some reason). *)
blanchet@43192
  1428
    val hyp_ts =
blanchet@43192
  1429
      hyp_ts
blanchet@43192
  1430
      |> map (fn t => if member (op aconv) fact_ts t then @{prop True} else t)
blanchet@42573
  1431
    val goal_t = Logic.list_implies (hyp_ts, concl_t)
blanchet@42573
  1432
    val all_ts = goal_t :: fact_ts
blanchet@42573
  1433
    val subs = tfree_classes_of_terms all_ts
blanchet@42573
  1434
    val supers = tvar_classes_of_terms all_ts
blanchet@43189
  1435
    val tycons = type_constrs_of_terms thy all_ts
blanchet@42994
  1436
    val conjs =
blanchet@43096
  1437
      hyp_ts @ [concl_t]
blanchet@43626
  1438
      |> make_conjecture ctxt format prem_kind type_enc preproc presimp_consts
blanchet@42573
  1439
    val (supers', arity_clauses) =
blanchet@43626
  1440
      if level_of_type_enc type_enc = No_Types then ([], [])
blanchet@42573
  1441
      else make_arity_clauses thy tycons supers
blanchet@42573
  1442
    val class_rel_clauses = make_class_rel_clauses thy subs supers'
blanchet@42573
  1443
  in
blanchet@42573
  1444
    (fact_names |> map single, (conjs, facts, class_rel_clauses, arity_clauses))
blanchet@42573
  1445
  end
blanchet@42573
  1446
blanchet@42573
  1447
fun fo_literal_from_type_literal (TyLitVar (class, name)) =
blanchet@42573
  1448
    (true, ATerm (class, [ATerm (name, [])]))
blanchet@42573
  1449
  | fo_literal_from_type_literal (TyLitFree (class, name)) =
blanchet@42573
  1450
    (true, ATerm (class, [ATerm (name, [])]))
blanchet@42573
  1451
blanchet@42573
  1452
fun formula_from_fo_literal (pos, t) = AAtom t |> not pos ? mk_anot
blanchet@42573
  1453
blanchet@43130
  1454
val type_pred = `make_fixed_const type_pred_name
blanchet@43130
  1455
blanchet@43626
  1456
fun type_pred_combterm ctxt format type_enc T tm =
blanchet@43179
  1457
  CombApp (CombConst (type_pred, T --> @{typ bool}, [T])
blanchet@43626
  1458
           |> enforce_type_arg_policy_in_combterm ctxt format type_enc, tm)
blanchet@42573
  1459
blanchet@43421
  1460
fun is_var_positively_naked_in_term _ (SOME false) _ accum = accum
blanchet@43421
  1461
  | is_var_positively_naked_in_term name _ (ATerm ((s, _), tms)) accum =
blanchet@43000
  1462
    accum orelse (is_tptp_equal s andalso member (op =) tms (ATerm (name, [])))
nik@43676
  1463
  | is_var_positively_naked_in_term name _ _ _ = true
blanchet@43493
  1464
fun should_predicate_on_var_in_formula pos phi (SOME true) name =
blanchet@43421
  1465
    formula_fold pos (is_var_positively_naked_in_term name) phi false
blanchet@43493
  1466
  | should_predicate_on_var_in_formula _ _ _ _ = true
blanchet@42834
  1467
nik@43677
  1468
fun mk_aterm format type_enc name T_args args =
nik@43677
  1469
  ATerm (name, map_filter (ho_term_for_type_arg format type_enc) T_args @ args)
blanchet@42994
  1470
blanchet@43626
  1471
fun tag_with_type ctxt format nonmono_Ts type_enc pos T tm =
blanchet@43130
  1472
  CombConst (type_tag, T --> T, [T])
blanchet@43626
  1473
  |> enforce_type_arg_policy_in_combterm ctxt format type_enc
nik@43677
  1474
  |> ho_term_from_combterm ctxt format nonmono_Ts type_enc (Top_Level pos)
blanchet@42829
  1475
  |> (fn ATerm (s, tms) => ATerm (s, tms @ [tm]))
nik@43677
  1476
and ho_term_from_combterm ctxt format nonmono_Ts type_enc =
blanchet@42573
  1477
  let
blanchet@42962
  1478
    fun aux site u =
blanchet@42962
  1479
      let
blanchet@42962
  1480
        val (head, args) = strip_combterm_comb u
nik@43677
  1481
        val pos =
blanchet@43361
  1482
          case site of
nik@43677
  1483
            Top_Level pos => pos
nik@43677
  1484
          | Eq_Arg pos => pos
nik@43677
  1485
          | Elsewhere => NONE
nik@43677
  1486
        val t =
nik@43677
  1487
          case head of
nik@43677
  1488
            CombConst (name as (s, _), _, T_args) =>
nik@43677
  1489
            let
nik@43677
  1490
              val arg_site = if is_tptp_equal s then Eq_Arg pos else Elsewhere
nik@43677
  1491
            in
nik@43677
  1492
              mk_aterm format type_enc name T_args (map (aux arg_site) args)
nik@43677
  1493
            end
nik@43677
  1494
          | CombVar (name, _) => mk_aterm format type_enc name [] []
nik@43677
  1495
          | CombAbs ((name, T), tm) =>
nik@43677
  1496
            AAbs ((name, ho_type_from_typ format type_enc true 0 T), aux Elsewhere tm)
nik@43677
  1497
          | CombApp _ => raise Fail "impossible \"CombApp\""
blanchet@42962
  1498
        val T = combtyp_of u
blanchet@42962
  1499
      in
blanchet@43626
  1500
        t |> (if should_tag_with_type ctxt nonmono_Ts type_enc site u T then
blanchet@43626
  1501
                tag_with_type ctxt format nonmono_Ts type_enc pos T
blanchet@42962
  1502
              else
blanchet@42962
  1503
                I)
blanchet@42962
  1504
      end
blanchet@42962
  1505
  in aux end
blanchet@43626
  1506
and formula_from_combformula ctxt format nonmono_Ts type_enc
blanchet@42962
  1507
                             should_predicate_on_var =
blanchet@42829
  1508
  let
blanchet@43361
  1509
    fun do_term pos =
nik@43677
  1510
      ho_term_from_combterm ctxt format nonmono_Ts type_enc (Top_Level pos)
blanchet@42573
  1511
    val do_bound_type =
blanchet@43626
  1512
      case type_enc of
blanchet@43624
  1513
        Simple_Types (_, level) =>
blanchet@42994
  1514
        homogenized_type ctxt nonmono_Ts level 0
nik@43677
  1515
        #> ho_type_from_typ format type_enc false 0 #> SOME
blanchet@42682
  1516
      | _ => K NONE
blanchet@42878
  1517
    fun do_out_of_bound_type pos phi universal (name, T) =
blanchet@43626
  1518
      if should_predicate_on_type ctxt nonmono_Ts type_enc
blanchet@42878
  1519
             (fn () => should_predicate_on_var pos phi universal name) T then
blanchet@42834
  1520
        CombVar (name, T)
blanchet@43626
  1521
        |> type_pred_combterm ctxt format type_enc T
blanchet@43361
  1522
        |> do_term pos |> AAtom |> SOME
blanchet@42573
  1523
      else
blanchet@42573
  1524
        NONE
blanchet@42878
  1525
    fun do_formula pos (AQuant (q, xs, phi)) =
blanchet@42878
  1526
        let
blanchet@42878
  1527
          val phi = phi |> do_formula pos
blanchet@42878
  1528
          val universal = Option.map (q = AExists ? not) pos
blanchet@42878
  1529
        in
blanchet@42834
  1530
          AQuant (q, xs |> map (apsnd (fn NONE => NONE
blanchet@42834
  1531
                                        | SOME T => do_bound_type T)),
blanchet@42834
  1532
                  (if q = AForall then mk_ahorn else fold_rev (mk_aconn AAnd))
blanchet@42834
  1533
                      (map_filter
blanchet@42834
  1534
                           (fn (_, NONE) => NONE
blanchet@42834
  1535
                             | (s, SOME T) =>
blanchet@42878
  1536
                               do_out_of_bound_type pos phi universal (s, T))
blanchet@42878
  1537
                           xs)
blanchet@42834
  1538
                      phi)
blanchet@42834
  1539
        end
blanchet@42878
  1540
      | do_formula pos (AConn conn) = aconn_map pos do_formula conn
blanchet@43361
  1541
      | do_formula pos (AAtom tm) = AAtom (do_term pos tm)
blanchet@43493
  1542
  in do_formula end
blanchet@42573
  1543
blanchet@43626
  1544
fun bound_tvars type_enc Ts =
blanchet@42727
  1545
  mk_ahorn (map (formula_from_fo_literal o fo_literal_from_type_literal)
blanchet@43626
  1546
                (type_literals_for_types type_enc add_sorts_on_tvar Ts))
blanchet@42727
  1547
blanchet@42573
  1548
(* Each fact is given a unique fact number to avoid name clashes (e.g., because
blanchet@42573
  1549
   of monomorphization). The TPTP explicitly forbids name clashes, and some of
blanchet@42573
  1550
   the remote provers might care. *)
blanchet@43501
  1551
fun formula_line_for_fact ctxt format prefix encode freshen pos nonmono_Ts
blanchet@43626
  1552
        type_enc (j, {name, locality, kind, combformula, atomic_types}) =
blanchet@43501
  1553
  (prefix ^ (if freshen then string_of_int j ^ "_" else "") ^ encode name,
blanchet@43493
  1554
   kind,
blanchet@43493
  1555
   combformula
blanchet@43493
  1556
   |> close_combformula_universally
blanchet@43626
  1557
   |> formula_from_combformula ctxt format nonmono_Ts type_enc
blanchet@43493
  1558
                               should_predicate_on_var_in_formula
blanchet@43501
  1559
                               (if pos then SOME true else NONE)
blanchet@43626
  1560
   |> bound_tvars type_enc atomic_types
blanchet@43493
  1561
   |> close_formula_universally,
blanchet@43493
  1562
   NONE,
blanchet@43493
  1563
   case locality of
blanchet@43493
  1564
     Intro => intro_info
blanchet@43493
  1565
   | Elim => elim_info
blanchet@43493
  1566
   | Simp => simp_info
blanchet@43493
  1567
   | _ => NONE)
blanchet@43493
  1568
  |> Formula
blanchet@42573
  1569
blanchet@43086
  1570
fun formula_line_for_class_rel_clause ({name, subclass, superclass, ...}
blanchet@43086
  1571
                                       : class_rel_clause) =
blanchet@42573
  1572
  let val ty_arg = ATerm (`I "T", []) in
blanchet@42577
  1573
    Formula (class_rel_clause_prefix ^ ascii_of name, Axiom,
blanchet@42573
  1574
             AConn (AImplies, [AAtom (ATerm (subclass, [ty_arg])),
blanchet@42573
  1575
                               AAtom (ATerm (superclass, [ty_arg]))])
blanchet@42879
  1576
             |> close_formula_universally, intro_info, NONE)
blanchet@42573
  1577
  end
blanchet@42573
  1578
blanchet@42573
  1579
fun fo_literal_from_arity_literal (TConsLit (c, t, args)) =
blanchet@42573
  1580
    (true, ATerm (c, [ATerm (t, map (fn arg => ATerm (arg, [])) args)]))
blanchet@42573
  1581
  | fo_literal_from_arity_literal (TVarLit (c, sort)) =
blanchet@42573
  1582
    (false, ATerm (c, [ATerm (sort, [])]))
blanchet@42573
  1583
blanchet@43086
  1584
fun formula_line_for_arity_clause ({name, prem_lits, concl_lits, ...}
blanchet@43086
  1585
                                   : arity_clause) =
blanchet@43495
  1586
  Formula (arity_clause_prefix ^ name, Axiom,
blanchet@42573
  1587
           mk_ahorn (map (formula_from_fo_literal o apfst not
blanchet@42895
  1588
                          o fo_literal_from_arity_literal) prem_lits)
blanchet@42573
  1589
                    (formula_from_fo_literal
blanchet@42895
  1590
                         (fo_literal_from_arity_literal concl_lits))
blanchet@42879
  1591
           |> close_formula_universally, intro_info, NONE)
blanchet@42573
  1592
blanchet@43626
  1593
fun formula_line_for_conjecture ctxt format nonmono_Ts type_enc
blanchet@43098
  1594
        ({name, kind, combformula, atomic_types, ...} : translated_formula) =
blanchet@42577
  1595
  Formula (conjecture_prefix ^ name, kind,
blanchet@43626
  1596
           formula_from_combformula ctxt format nonmono_Ts type_enc
blanchet@43493
  1597
               should_predicate_on_var_in_formula (SOME false)
blanchet@42939
  1598
               (close_combformula_universally combformula)
blanchet@43626
  1599
           |> bound_tvars type_enc atomic_types
blanchet@42573
  1600
           |> close_formula_universally, NONE, NONE)
blanchet@42573
  1601
blanchet@43626
  1602
fun free_type_literals type_enc ({atomic_types, ...} : translated_formula) =
blanchet@43626
  1603
  atomic_types |> type_literals_for_types type_enc add_sorts_on_tfree
blanchet@42573
  1604
               |> map fo_literal_from_type_literal
blanchet@42573
  1605
blanchet@42573
  1606
fun formula_line_for_free_type j lit =
blanchet@43085
  1607
  Formula (tfree_clause_prefix ^ string_of_int j, Hypothesis,
blanchet@42573
  1608
           formula_from_fo_literal lit, NONE, NONE)
blanchet@43626
  1609
fun formula_lines_for_free_types type_enc facts =
blanchet@42573
  1610
  let
blanchet@43626
  1611
    val litss = map (free_type_literals type_enc) facts
blanchet@42573
  1612
    val lits = fold (union (op =)) litss []
blanchet@42573
  1613
  in map2 formula_line_for_free_type (0 upto length lits - 1) lits end
blanchet@42573
  1614
blanchet@42573
  1615
(** Symbol declarations **)
blanchet@42544
  1616
blanchet@43626
  1617
fun should_declare_sym type_enc pred_sym s =
blanchet@42998
  1618
  is_tptp_user_symbol s andalso not (String.isPrefix bound_var_prefix s) andalso
blanchet@43626
  1619
  (case type_enc of
blanchet@42894
  1620
     Simple_Types _ => true
blanchet@43128
  1621
   | Tags (_, _, Lightweight) => true
blanchet@42894
  1622
   | _ => not pred_sym)
blanchet@38282
  1623
blanchet@43626
  1624
fun sym_decl_table_for_facts ctxt type_enc repaired_sym_tab (conjs, facts) =
blanchet@42574
  1625
  let
blanchet@42698
  1626
    fun add_combterm in_conj tm =
blanchet@42574
  1627
      let val (head, args) = strip_combterm_comb tm in
blanchet@42574
  1628
        (case head of
blanchet@42574
  1629
           CombConst ((s, s'), T, T_args) =>
blanchet@42574
  1630
           let val pred_sym = is_pred_sym repaired_sym_tab s in
blanchet@43626
  1631
             if should_declare_sym type_enc pred_sym s then
blanchet@42576
  1632
               Symtab.map_default (s, [])
blanchet@42886
  1633
                   (insert_type ctxt #3 (s', T_args, T, pred_sym, length args,
blanchet@42886
  1634
                                         in_conj))
blanchet@42574
  1635
             else
blanchet@42574
  1636
               I
blanchet@42574
  1637
           end
blanchet@42574
  1638
         | _ => I)
blanchet@42698
  1639
        #> fold (add_combterm in_conj) args
blanchet@42574
  1640
      end
blanchet@42698
  1641
    fun add_fact in_conj =
blanchet@42834
  1642
      fact_lift (formula_fold NONE (K (add_combterm in_conj)))
blanchet@42698
  1643
  in
blanchet@42698
  1644
    Symtab.empty
blanchet@43626
  1645
    |> is_type_enc_fairly_sound type_enc
blanchet@42698
  1646
       ? (fold (add_fact true) conjs #> fold (add_fact false) facts)
blanchet@42698
  1647
  end
blanchet@42533
  1648
blanchet@42685
  1649
(* This inference is described in section 2.3 of Claessen et al.'s "Sorting it
blanchet@42685
  1650
   out with monotonicity" paper presented at CADE 2011. *)
blanchet@43572
  1651
fun add_combterm_nonmonotonic_types _ _ _ _ (SOME false) _ = I
blanchet@43572
  1652
  | add_combterm_nonmonotonic_types ctxt level sound locality _
blanchet@43179
  1653
        (CombApp (CombApp (CombConst ((s, _), Type (_, [T, _]), _), tm1),
blanchet@43179
  1654
                           tm2)) =
blanchet@43000
  1655
    (is_tptp_equal s andalso exists is_var_or_bound_var [tm1, tm2] andalso
blanchet@42829
  1656
     (case level of
blanchet@43362
  1657
        Noninf_Nonmono_Types =>
blanchet@43293
  1658
        not (is_locality_global locality) orelse
blanchet@43572
  1659
        not (is_type_surely_infinite ctxt sound T)
blanchet@43572
  1660
      | Fin_Nonmono_Types => is_type_surely_finite ctxt false T
blanchet@42886
  1661
      | _ => true)) ? insert_type ctxt I (deep_freeze_type T)
blanchet@43572
  1662
  | add_combterm_nonmonotonic_types _ _ _ _ _ _ = I
blanchet@43572
  1663
fun add_fact_nonmonotonic_types ctxt level sound
blanchet@43572
  1664
        ({kind, locality, combformula, ...} : translated_formula) =
blanchet@42834
  1665
  formula_fold (SOME (kind <> Conjecture))
blanchet@43572
  1666
               (add_combterm_nonmonotonic_types ctxt level sound locality)
blanchet@43572
  1667
               combformula
blanchet@43626
  1668
fun nonmonotonic_types_for_facts ctxt type_enc sound facts =
blanchet@43626
  1669
  let val level = level_of_type_enc type_enc in
blanchet@43362
  1670
    if level = Noninf_Nonmono_Types orelse level = Fin_Nonmono_Types then
blanchet@43572
  1671
      [] |> fold (add_fact_nonmonotonic_types ctxt level sound) facts
blanchet@42886
  1672
         (* We must add "bool" in case the helper "True_or_False" is added
blanchet@42886
  1673
            later. In addition, several places in the code rely on the list of
blanchet@42886
  1674
            nonmonotonic types not being empty. *)
blanchet@42886
  1675
         |> insert_type ctxt I @{typ bool}
blanchet@42886
  1676
    else
blanchet@42886
  1677
      []
blanchet@42829
  1678
  end
blanchet@42677
  1679
blanchet@43626
  1680
fun decl_line_for_sym ctxt format nonmono_Ts type_enc s
blanchet@42994
  1681
                      (s', T_args, T, pred_sym, ary, _) =
blanchet@42994
  1682
  let
blanchet@43178
  1683
    val (T_arg_Ts, level) =
blanchet@43626
  1684
      case type_enc of
blanchet@43624
  1685
        Simple_Types (_, level) => ([], level)
blanchet@43178
  1686
      | _ => (replicate (length T_args) homo_infinite_type, No_Types)
blanchet@42994
  1687
  in
blanchet@42998
  1688
    Decl (sym_decl_prefix ^ s, (s, s'),
blanchet@42994
  1689
          (T_arg_Ts ---> (T |> homogenized_type ctxt nonmono_Ts level ary))
nik@43677
  1690
          |> ho_type_from_typ format type_enc pred_sym (length T_arg_Ts + ary))
blanchet@42994
  1691
  end
blanchet@42579
  1692
blanchet@43125
  1693
fun formula_line_for_preds_sym_decl ctxt format conj_sym_kind nonmono_Ts
blanchet@43626
  1694
        poly_nonmono_Ts type_enc n s j (s', T_args, T, _, ary, in_conj) =
blanchet@42579
  1695
  let
blanchet@42709
  1696
    val (kind, maybe_negate) =
blanchet@42709
  1697
      if in_conj then (conj_sym_kind, conj_sym_kind = Conjecture ? mk_anot)
blanchet@42709
  1698
      else (Axiom, I)
blanchet@42753
  1699
    val (arg_Ts, res_T) = chop_fun ary T
blanchet@43399
  1700
    val num_args = length arg_Ts
blanchet@42579
  1701
    val bound_names =
blanchet@43399
  1702
      1 upto num_args |> map (`I o make_bound_var o string_of_int)
blanchet@42829
  1703
    val bounds =
blanchet@42579
  1704
      bound_names ~~ arg_Ts |> map (fn (name, T) => CombConst (name, T, []))
blanchet@43401
  1705
    val sym_needs_arg_types = n > 1 orelse exists (curry (op =) dummyT) T_args
blanchet@43401
  1706
    fun should_keep_arg_type T =
blanchet@43401
  1707
      sym_needs_arg_types orelse
blanchet@43626
  1708
      not (should_predicate_on_type ctxt nonmono_Ts type_enc (K false) T)
blanchet@42579
  1709
    val bound_Ts =
blanchet@43401
  1710
      arg_Ts |> map (fn T => if should_keep_arg_type T then SOME T else NONE)
blanchet@42579
  1711
  in
blanchet@43125
  1712
    Formula (preds_sym_formula_prefix ^ s ^
blanchet@42709
  1713
             (if n > 1 then "_" ^ string_of_int j else ""), kind,
blanchet@42579
  1714
             CombConst ((s, s'), T, T_args)
blanchet@42829
  1715
             |> fold (curry (CombApp o swap)) bounds
blanchet@43626
  1716
             |> type_pred_combterm ctxt format type_enc res_T
blanchet@42963
  1717
             |> AAtom |> mk_aquant AForall (bound_names ~~ bound_Ts)
blanchet@43626
  1718
             |> formula_from_combformula ctxt format poly_nonmono_Ts type_enc
blanchet@43493
  1719
                                         (K (K (K (K true)))) (SOME true)
blanchet@43626
  1720
             |> n > 1 ? bound_tvars type_enc (atyps_of T)
blanchet@42709
  1721
             |> close_formula_universally
blanchet@42709
  1722
             |> maybe_negate,
blanchet@42879
  1723
             intro_info, NONE)
blanchet@42579
  1724
  end
blanchet@42579
  1725
blanchet@43129
  1726
fun formula_lines_for_lightweight_tags_sym_decl ctxt format conj_sym_kind
blanchet@43626
  1727
        poly_nonmono_Ts type_enc n s
blanchet@43401
  1728
        (j, (s', T_args, T, pred_sym, ary, in_conj)) =
blanchet@42829
  1729
  let
blanchet@42829
  1730
    val ident_base =
blanchet@43129
  1731
      lightweight_tags_sym_formula_prefix ^ s ^
blanchet@43125
  1732
      (if n > 1 then "_" ^ string_of_int j else "")
blanchet@42852
  1733
    val (kind, maybe_negate) =
blanchet@42852
  1734
      if in_conj then (conj_sym_kind, conj_sym_kind = Conjecture ? mk_anot)
blanchet@42852
  1735
      else (Axiom, I)
blanchet@42829
  1736
    val (arg_Ts, res_T) = chop_fun ary T
blanchet@42829
  1737
    val bound_names =
blanchet@42829
  1738
      1 upto length arg_Ts |> map (`I o make_bound_var o string_of_int)
blanchet@42829
  1739
    val bounds = bound_names |> map (fn name => ATerm (name, []))
nik@43677
  1740
    val cst = mk_aterm format type_enc (s, s') T_args
blanchet@42830
  1741
    val atomic_Ts = atyps_of T
blanchet@42834
  1742
    fun eq tms =
blanchet@42834
  1743
      (if pred_sym then AConn (AIff, map AAtom tms)
blanchet@43000
  1744
       else AAtom (ATerm (`I tptp_equal, tms)))
blanchet@43626
  1745
      |> bound_tvars type_enc atomic_Ts
blanchet@42830
  1746
      |> close_formula_universally
blanchet@42852
  1747
      |> maybe_negate
blanchet@43361
  1748
    (* See also "should_tag_with_type". *)
blanchet@43361
  1749
    fun should_encode T =
blanchet@43401
  1750
      should_encode_type ctxt poly_nonmono_Ts All_Types T orelse
blanchet@43626
  1751
      (case type_enc of
blanchet@43361
  1752
         Tags (Polymorphic, level, Lightweight) =>
blanchet@43361
  1753
         level <> All_Types andalso Monomorph.typ_has_tvars T
blanchet@43361
  1754
       | _ => false)
blanchet@43626
  1755
    val tag_with = tag_with_type ctxt format poly_nonmono_Ts type_enc NONE
blanchet@42829
  1756
    val add_formula_for_res =
blanchet@42829
  1757
      if should_encode res_T then
blanchet@42852
  1758
        cons (Formula (ident_base ^ "_res", kind,
blanchet@42994
  1759
                       eq [tag_with res_T (cst bounds), cst bounds],
blanchet@42879
  1760
                       simp_info, NONE))
blanchet@42829
  1761
      else
blanchet@42829
  1762
        I
blanchet@42829
  1763
    fun add_formula_for_arg k =
blanchet@42829
  1764
      let val arg_T = nth arg_Ts k in
blanchet@42829
  1765
        if should_encode arg_T then
blanchet@42829
  1766
          case chop k bounds of
blanchet@42829
  1767
            (bounds1, bound :: bounds2) =>
blanchet@42852
  1768
            cons (Formula (ident_base ^ "_arg" ^ string_of_int (k + 1), kind,
blanchet@42994
  1769
                           eq [cst (bounds1 @ tag_with arg_T bound :: bounds2),
blanchet@42994
  1770
                               cst bounds],
blanchet@42879
  1771
                           simp_info, NONE))
blanchet@42829
  1772
          | _ => raise Fail "expected nonempty tail"
blanchet@42829
  1773
        else
blanchet@42829
  1774
          I
blanchet@42829
  1775
      end
blanchet@42829
  1776
  in
blanchet@42834
  1777
    [] |> not pred_sym ? add_formula_for_res
blanchet@42829
  1778
       |> fold add_formula_for_arg (ary - 1 downto 0)
blanchet@42829
  1779
  end
blanchet@42829
  1780
blanchet@42836
  1781
fun result_type_of_decl (_, _, T, _, ary, _) = chop_fun ary T |> snd
blanchet@42836
  1782
blanchet@43401
  1783
fun problem_lines_for_sym_decls ctxt format conj_sym_kind nonmono_Ts
blanchet@43626
  1784
                                poly_nonmono_Ts type_enc (s, decls) =
blanchet@43626
  1785
  case type_enc of
blanchet@42998
  1786
    Simple_Types _ =>
blanchet@43626
  1787
    decls |> map (decl_line_for_sym ctxt format nonmono_Ts type_enc s)
blanchet@42998
  1788
  | Preds _ =>
blanchet@42998
  1789
    let
blanchet@42998
  1790
      val decls =
blanchet@42998
  1791
        case decls of
blanchet@42998
  1792
          decl :: (decls' as _ :: _) =>
blanchet@42998
  1793
          let val T = result_type_of_decl decl in
blanchet@42998
  1794
            if forall (curry (type_instance ctxt o swap) T
blanchet@42998
  1795
                       o result_type_of_decl) decls' then
blanchet@42998
  1796
              [decl]
blanchet@42998
  1797
            else
blanchet@42998
  1798
              decls
blanchet@42998
  1799
          end
blanchet@42998
  1800
        | _ => decls
blanchet@42998
  1801
      val n = length decls
blanchet@42998
  1802
      val decls =
blanchet@43626
  1803
        decls |> filter (should_predicate_on_type ctxt poly_nonmono_Ts type_enc
blanchet@43401
  1804
                                                  (K true)
blanchet@43401
  1805
                         o result_type_of_decl)
blanchet@42998
  1806
    in
blanchet@42998
  1807
      (0 upto length decls - 1, decls)
blanchet@43125
  1808
      |-> map2 (formula_line_for_preds_sym_decl ctxt format conj_sym_kind
blanchet@43626
  1809
                   nonmono_Ts poly_nonmono_Ts type_enc n s)
blanchet@42998
  1810
    end
blanchet@42998
  1811
  | Tags (_, _, heaviness) =>
blanchet@42998
  1812
    (case heaviness of
blanchet@43128
  1813
       Heavyweight => []
blanchet@43128
  1814
     | Lightweight =>
blanchet@42998
  1815
       let val n = length decls in
blanchet@42998
  1816
         (0 upto n - 1 ~~ decls)
blanchet@43129
  1817
         |> maps (formula_lines_for_lightweight_tags_sym_decl ctxt format
blanchet@43626
  1818
                      conj_sym_kind poly_nonmono_Ts type_enc n s)
blanchet@42998
  1819
       end)
blanchet@42579
  1820
blanchet@42956
  1821
fun problem_lines_for_sym_decl_table ctxt format conj_sym_kind nonmono_Ts
blanchet@43626
  1822
                                     poly_nonmono_Ts type_enc sym_decl_tab =
blanchet@42998
  1823
  sym_decl_tab
blanchet@42998
  1824
  |> Symtab.dest
blanchet@42998
  1825
  |> sort_wrt fst
blanchet@42998
  1826
  |> rpair []
blanchet@42998
  1827
  |-> fold_rev (append o problem_lines_for_sym_decls ctxt format conj_sym_kind
blanchet@43626
  1828
                             nonmono_Ts poly_nonmono_Ts type_enc)
blanchet@42543
  1829
blanchet@43185
  1830
fun needs_type_tag_idempotence (Tags (poly, level, heaviness)) =
blanchet@43185
  1831
    poly <> Mangled_Monomorphic andalso
blanchet@43185
  1832
    ((level = All_Types andalso heaviness = Lightweight) orelse
blanchet@43362
  1833
     level = Noninf_Nonmono_Types orelse level = Fin_Nonmono_Types)
blanchet@43159
  1834
  | needs_type_tag_idempotence _ = false
blanchet@42831
  1835
blanchet@42939
  1836
fun offset_of_heading_in_problem _ [] j = j
blanchet@42939
  1837
  | offset_of_heading_in_problem needle ((heading, lines) :: problem) j =
blanchet@42939
  1838
    if heading = needle then j
blanchet@42939
  1839
    else offset_of_heading_in_problem needle problem (j + length lines)
blanchet@42939
  1840
blanchet@42998
  1841
val implicit_declsN = "Should-be-implicit typings"
blanchet@42998
  1842
val explicit_declsN = "Explicit typings"
blanchet@41157
  1843
val factsN = "Relevant facts"
blanchet@41157
  1844
val class_relsN = "Class relationships"
blanchet@42543
  1845
val aritiesN = "Arities"
blanchet@41157
  1846
val helpersN = "Helper facts"
blanchet@41157
  1847
val conjsN = "Conjectures"
blanchet@41313
  1848
val free_typesN = "Type variables"
blanchet@41157
  1849
blanchet@43259
  1850
val explicit_apply = NONE (* for experimental purposes *)
blanchet@43259
  1851
blanchet@43626
  1852
fun prepare_atp_problem ctxt format conj_sym_kind prem_kind type_enc sound
blanchet@43493
  1853
        exporter readable_names preproc hyp_ts concl_t facts =
blanchet@38282
  1854
  let
blanchet@43626
  1855
    val (format, type_enc) = choose_format [format] type_enc
blanchet@41313
  1856
    val (fact_names, (conjs, facts, class_rel_clauses, arity_clauses)) =
blanchet@43626
  1857
      translate_formulas ctxt format prem_kind type_enc preproc hyp_ts concl_t
blanchet@43096
  1858
                         facts
blanchet@43064
  1859
    val sym_tab = conjs @ facts |> sym_table_for_facts ctxt explicit_apply
blanchet@43572
  1860
    val nonmono_Ts =
blanchet@43626
  1861
      conjs @ facts |> nonmonotonic_types_for_facts ctxt type_enc sound
blanchet@43626
  1862
    val repair = repair_fact ctxt format type_enc sym_tab
blanchet@42682
  1863
    val (conjs, facts) = (conjs, facts) |> pairself (map repair)
blanchet@43064
  1864
    val repaired_sym_tab =
blanchet@43064
  1865
      conjs @ facts |> sym_table_for_facts ctxt (SOME false)
blanchet@42573
  1866
    val helpers =
blanchet@43626
  1867
      repaired_sym_tab |> helper_facts_for_sym_table ctxt format type_enc
blanchet@42962
  1868
                       |> map repair
blanchet@43401
  1869
    val poly_nonmono_Ts =
blanchet@43213
  1870
      if null nonmono_Ts orelse nonmono_Ts = [@{typ bool}] orelse
blanchet@43626
  1871
         polymorphism_of_type_enc type_enc <> Polymorphic then
blanchet@42894
  1872
        nonmono_Ts
blanchet@42894
  1873
      else
blanchet@42894
  1874
        [TVar (("'a", 0), HOLogic.typeS)]
blanchet@42680
  1875
    val sym_decl_lines =
blanchet@42731
  1876
      (conjs, helpers @ facts)
blanchet@43626
  1877
      |> sym_decl_table_for_facts ctxt type_enc repaired_sym_tab
blanchet@43401
  1878
      |> problem_lines_for_sym_decl_table ctxt format conj_sym_kind nonmono_Ts
blanchet@43626
  1879
                                               poly_nonmono_Ts type_enc
blanchet@42881
  1880
    val helper_lines =
blanchet@42956
  1881
      0 upto length helpers - 1 ~~ helpers
blanchet@43501
  1882
      |> map (formula_line_for_fact ctxt format helper_prefix I false true
blanchet@43626
  1883
                                    poly_nonmono_Ts type_enc)
blanchet@43626
  1884
      |> (if needs_type_tag_idempotence type_enc then
blanchet@43159
  1885
            cons (type_tag_idempotence_fact ())
blanchet@43159
  1886
          else
blanchet@43159
  1887
            I)
blanchet@42522
  1888
    (* Reordering these might confuse the proof reconstruction code or the SPASS
blanchet@43039
  1889
       FLOTTER hack. *)
blanchet@38282
  1890
    val problem =
blanchet@42998
  1891
      [(explicit_declsN, sym_decl_lines),
blanchet@42956
  1892
       (factsN,
blanchet@43501
  1893
        map (formula_line_for_fact ctxt format fact_prefix ascii_of
blanchet@43501
  1894
                                   (not exporter) (not exporter) nonmono_Ts
blanchet@43626
  1895
                                   type_enc)
blanchet@42956
  1896
            (0 upto length facts - 1 ~~ facts)),
blanchet@42545
  1897
       (class_relsN, map formula_line_for_class_rel_clause class_rel_clauses),
blanchet@42545
  1898
       (aritiesN, map formula_line_for_arity_clause arity_clauses),
blanchet@42881
  1899
       (helpersN, helper_lines),
blanchet@42962
  1900
       (conjsN,
blanchet@43626
  1901
        map (formula_line_for_conjecture ctxt format nonmono_Ts type_enc)
blanchet@42962
  1902
            conjs),
blanchet@43626
  1903
       (free_typesN, formula_lines_for_free_types type_enc (facts @ conjs))]
blanchet@42543
  1904
    val problem =
blanchet@42561
  1905
      problem
blanchet@43092
  1906
      |> (case format of
blanchet@43092
  1907
            CNF => ensure_cnf_problem
blanchet@43092
  1908
          | CNF_UEQ => filter_cnf_ueq_problem
blanchet@43092
  1909
          | _ => I)
blanchet@42998
  1910
      |> (if is_format_typed format then
blanchet@42998
  1911
            declare_undeclared_syms_in_atp_problem type_decl_prefix
blanchet@42998
  1912
                                                   implicit_declsN
blanchet@42998
  1913
          else
blanchet@42998
  1914
            I)
blanchet@43092
  1915
    val (problem, pool) = problem |> nice_atp_problem readable_names
blanchet@42881
  1916
    val helpers_offset = offset_of_heading_in_problem helpersN problem 0
blanchet@42881
  1917
    val typed_helpers =
blanchet@42881
  1918
      map_filter (fn (j, {name, ...}) =>
blanchet@42881
  1919
                     if String.isSuffix typed_helper_suffix name then SOME j
blanchet@42881
  1920
                     else NONE)
blanchet@42881
  1921
                 ((helpers_offset + 1 upto helpers_offset + length helpers)
blanchet@42881
  1922
                  ~~ helpers)
blanchet@42778
  1923
    fun add_sym_arity (s, {min_ary, ...} : sym_info) =
blanchet@42755
  1924
      if min_ary > 0 then
blanchet@42755
  1925
        case strip_prefix_and_unascii const_prefix s of
blanchet@42755
  1926
          SOME s => Symtab.insert (op =) (s, min_ary)
blanchet@42755
  1927
        | NONE => I
blanchet@42755
  1928
      else
blanchet@42755
  1929
        I
blanchet@38282
  1930
  in
blanchet@38282
  1931
    (problem,
blanchet@38282
  1932
     case pool of SOME the_pool => snd the_pool | NONE => Symtab.empty,
blanchet@42585
  1933
     offset_of_heading_in_problem conjsN problem 0,
blanchet@42541
  1934
     offset_of_heading_in_problem factsN problem 0,
blanchet@42755
  1935
     fact_names |> Vector.fromList,
blanchet@42881
  1936
     typed_helpers,
blanchet@42755
  1937
     Symtab.empty |> Symtab.fold add_sym_arity sym_tab)
blanchet@38282
  1938
  end
blanchet@38282
  1939
blanchet@41313
  1940
(* FUDGE *)
blanchet@41313
  1941
val conj_weight = 0.0
blanchet@41770
  1942
val hyp_weight = 0.1
blanchet@41770
  1943
val fact_min_weight = 0.2
blanchet@41313
  1944
val fact_max_weight = 1.0
blanchet@42608
  1945
val type_info_default_weight = 0.8
blanchet@41313
  1946
blanchet@41313
  1947
fun add_term_weights weight (ATerm (s, tms)) =
nik@43676
  1948
    is_tptp_user_symbol s ? Symtab.default (s, weight)
nik@43676
  1949
    #> fold (add_term_weights weight) tms
nik@43676
  1950
  | add_term_weights weight (AAbs (_, tm)) = add_term_weights weight tm
blanchet@42577
  1951
fun add_problem_line_weights weight (Formula (_, _, phi, _, _)) =
blanchet@42834
  1952
    formula_fold NONE (K (add_term_weights weight)) phi
blanchet@42528
  1953
  | add_problem_line_weights _ _ = I
blanchet@41313
  1954
blanchet@41313
  1955
fun add_conjectures_weights [] = I
blanchet@41313
  1956
  | add_conjectures_weights conjs =
blanchet@41313
  1957
    let val (hyps, conj) = split_last conjs in
blanchet@41313
  1958
      add_problem_line_weights conj_weight conj
blanchet@41313
  1959
      #> fold (add_problem_line_weights hyp_weight) hyps
blanchet@41313
  1960
    end
blanchet@41313
  1961
blanchet@41313
  1962
fun add_facts_weights facts =
blanchet@41313
  1963
  let
blanchet@41313
  1964
    val num_facts = length facts
blanchet@41313
  1965
    fun weight_of j =
blanchet@41313
  1966
      fact_min_weight + (fact_max_weight - fact_min_weight) * Real.fromInt j
blanchet@41313
  1967
                        / Real.fromInt num_facts
blanchet@41313
  1968
  in
blanchet@41313
  1969
    map weight_of (0 upto num_facts - 1) ~~ facts
blanchet@41313
  1970
    |> fold (uncurry add_problem_line_weights)
blanchet@41313
  1971
  end
blanchet@41313
  1972
blanchet@41313
  1973
(* Weights are from 0.0 (most important) to 1.0 (least important). *)
blanchet@41313
  1974
fun atp_problem_weights problem =
blanchet@42608
  1975
  let val get = these o AList.lookup (op =) problem in
blanchet@42608
  1976
    Symtab.empty
blanchet@42608
  1977
    |> add_conjectures_weights (get free_typesN @ get conjsN)
blanchet@42608
  1978
    |> add_facts_weights (get factsN)
blanchet@42608
  1979
    |> fold (fold (add_problem_line_weights type_info_default_weight) o get)
blanchet@42998
  1980
            [explicit_declsN, class_relsN, aritiesN]
blanchet@42608
  1981
    |> Symtab.dest
blanchet@42608
  1982
    |> sort (prod_ord Real.compare string_ord o pairself swap)
blanchet@42608
  1983
  end
blanchet@41313
  1984
blanchet@38282
  1985
end;