src/HOL/Tools/ATP/atp_translate.ML
author blanchet
Mon Jun 06 20:56:06 2011 +0200 (2011-06-06)
changeset 43214 4e850b2c1f5c
parent 43213 e1fdd27e0c98
child 43222 d90151a666cc
permissions -rw-r--r--
removed old optimization that isn't one anyone
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(*  Title:      HOL/Tools/Sledgehammer/sledgehammer_atp_translate.ML
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    Author:     Fabian Immler, TU Muenchen
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    Author:     Makarius
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    Author:     Jasmin Blanchette, TU Muenchen
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Translation of HOL to FOL for Sledgehammer.
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*)
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signature ATP_TRANSLATE =
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sig
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  type 'a fo_term = 'a ATP_Problem.fo_term
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  type 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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  type name = string * string
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  datatype type_literal =
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    TyLitVar of name * name |
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    TyLitFree of name * name
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  datatype arity_literal =
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    TConsLit of name * name * name list |
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    TVarLit of name * name
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  type arity_clause =
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    {name: string,
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     prem_lits: arity_literal list,
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     concl_lits: arity_literal}
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  type class_rel_clause =
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    {name: string,
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     subclass: name,
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     superclass: name}
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  datatype combterm =
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    CombConst of name * typ * typ list |
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    CombVar of name * typ |
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    CombApp of combterm * combterm
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  datatype locality = General | Intro | Elim | Simp | Local | Assum | Chained
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  datatype polymorphism = Polymorphic | Monomorphic | Mangled_Monomorphic
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  datatype type_level =
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    All_Types | Nonmonotonic_Types | Finite_Types | Const_Arg_Types | No_Types
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  datatype type_heaviness = Heavyweight | Lightweight
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  datatype type_sys =
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    Simple_Types of 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 make_bound_var : string -> string
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  val make_schematic_var : string * int -> string
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  val make_fixed_var : string -> string
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  val make_schematic_type_var : string * int -> string
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  val make_fixed_type_var : string -> string
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  val make_fixed_const : string -> string
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  val make_fixed_type_const : string -> string
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  val make_type_class : 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 make_arity_clauses :
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    theory -> string list -> class list -> class list * arity_clause list
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  val make_class_rel_clauses :
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    theory -> class list -> class list -> class_rel_clause list
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  val combtyp_of : combterm -> typ
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  val strip_combterm_comb : combterm -> combterm * combterm list
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  val atyps_of : typ -> typ list
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  val combterm_from_term :
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    theory -> (string * typ) list -> term -> combterm * typ list
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  val is_locality_global : locality -> bool
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  val type_sys_from_string : string -> type_sys
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  val polymorphism_of_type_sys : type_sys -> polymorphism
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  val level_of_type_sys : type_sys -> type_level
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  val is_type_sys_virtually_sound : type_sys -> bool
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  val is_type_sys_fairly_sound : type_sys -> bool
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  val choose_format : format list -> type_sys -> format * type_sys
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  val raw_type_literals_for_types : typ list -> type_literal list
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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_name : string -> string
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  val unmangled_const : string -> string * string fo_term list
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  val helper_table : ((string * bool) * thm list) list
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  val should_specialize_helper : type_sys -> term -> bool
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  val tfree_classes_of_terms : term list -> string list
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  val tvar_classes_of_terms : term list -> string list
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  val type_constrs_of_terms : theory -> term list -> string list
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  val prepare_atp_problem :
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    Proof.context -> format -> formula_kind -> formula_kind -> type_sys
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    -> bool option -> bool -> bool -> term list -> term
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    -> ((string * locality) * thm) 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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(* FIXME: avoid *)
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fun union_all xss = fold (union (op =)) xss []
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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 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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(*Remove the initial ' character from a type variable, if it is present*)
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fun trim_type_var s =
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  if s <> "" andalso String.sub(s,0) = #"'" then String.extract(s,1,NONE)
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  else raise Fail ("trim_type: Malformed type variable encountered: " ^ s)
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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
blanchet@43085
   326
fun make_fixed_var x = fixed_var_prefix ^ ascii_of x
blanchet@43085
   327
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   328
fun make_schematic_type_var (x,i) =
blanchet@43085
   329
      tvar_prefix ^ (ascii_of_indexname (trim_type_var x, i))
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   330
fun make_fixed_type_var x = tfree_prefix ^ (ascii_of (trim_type_var x))
blanchet@43085
   331
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   332
(* HOL.eq MUST BE "equal" because it's built into ATPs. *)
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   333
fun make_fixed_const @{const_name HOL.eq} = "equal"
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   334
  | make_fixed_const c = const_prefix ^ lookup_const c
blanchet@43085
   335
blanchet@43085
   336
fun make_fixed_type_const c = type_const_prefix ^ lookup_const c
blanchet@43085
   337
blanchet@43085
   338
fun make_type_class clas = class_prefix ^ ascii_of clas
blanchet@43085
   339
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   340
fun new_skolem_var_name_from_const s =
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   341
  let val ss = s |> space_explode Long_Name.separator in
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   342
    nth ss (length ss - 2)
blanchet@43093
   343
  end
blanchet@43093
   344
blanchet@43093
   345
(* The number of type arguments of a constant, zero if it's monomorphic. For
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   346
   (instances of) Skolem pseudoconstants, this information is encoded in the
blanchet@43093
   347
   constant name. *)
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   348
fun num_type_args thy s =
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   349
  if String.isPrefix skolem_const_prefix s then
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   350
    s |> space_explode Long_Name.separator |> List.last |> Int.fromString |> the
blanchet@43093
   351
  else
blanchet@43093
   352
    (s, Sign.the_const_type thy s) |> Sign.const_typargs thy |> length
blanchet@43093
   353
blanchet@43085
   354
(** Definitions and functions for FOL clauses and formulas for TPTP **)
blanchet@43085
   355
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   356
(* The first component is the type class; the second is a "TVar" or "TFree". *)
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   357
datatype type_literal =
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   358
  TyLitVar of name * name |
blanchet@43085
   359
  TyLitFree of name * name
blanchet@43085
   360
blanchet@43085
   361
blanchet@43085
   362
(** Isabelle arities **)
blanchet@43085
   363
blanchet@43085
   364
datatype arity_literal =
blanchet@43085
   365
  TConsLit of name * name * name list |
blanchet@43085
   366
  TVarLit of name * name
blanchet@43085
   367
blanchet@43085
   368
fun gen_TVars 0 = []
blanchet@43093
   369
  | gen_TVars n = ("T_" ^ string_of_int n) :: gen_TVars (n-1)
blanchet@43085
   370
blanchet@43085
   371
fun pack_sort (_,[])  = []
blanchet@43085
   372
  | pack_sort (tvar, "HOL.type" :: srt) =
blanchet@43085
   373
    pack_sort (tvar, srt) (* IGNORE sort "type" *)
blanchet@43085
   374
  | pack_sort (tvar, cls :: srt) =
blanchet@43085
   375
    (`make_type_class cls, `I tvar) :: pack_sort (tvar, srt)
blanchet@43085
   376
blanchet@43086
   377
type arity_clause =
blanchet@43086
   378
  {name: string,
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   379
   prem_lits: arity_literal list,
blanchet@43086
   380
   concl_lits: arity_literal}
blanchet@43085
   381
blanchet@43085
   382
(* Arity of type constructor "tcon :: (arg1, ..., argN) res" *)
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   383
fun make_axiom_arity_clause (tcons, name, (cls, args)) =
blanchet@43085
   384
  let
blanchet@43085
   385
    val tvars = gen_TVars (length args)
blanchet@43085
   386
    val tvars_srts = ListPair.zip (tvars, args)
blanchet@43085
   387
  in
blanchet@43086
   388
    {name = name,
blanchet@43086
   389
     prem_lits = map TVarLit (union_all (map pack_sort tvars_srts)),
blanchet@43086
   390
     concl_lits = TConsLit (`make_type_class cls,
blanchet@43086
   391
                            `make_fixed_type_const tcons,
blanchet@43086
   392
                            tvars ~~ tvars)}
blanchet@43085
   393
  end
blanchet@43085
   394
blanchet@43085
   395
fun arity_clause _ _ (_, []) = []
blanchet@43085
   396
  | arity_clause seen n (tcons, ("HOL.type",_)::ars) =  (*ignore*)
blanchet@43085
   397
      arity_clause seen n (tcons,ars)
blanchet@43085
   398
  | arity_clause seen n (tcons, (ar as (class,_)) :: ars) =
blanchet@43085
   399
      if member (op =) seen class then (*multiple arities for the same tycon, class pair*)
blanchet@43085
   400
          make_axiom_arity_clause (tcons, lookup_const tcons ^ "_" ^ class ^ "_" ^ string_of_int n, ar) ::
blanchet@43085
   401
          arity_clause seen (n+1) (tcons,ars)
blanchet@43085
   402
      else
blanchet@43085
   403
          make_axiom_arity_clause (tcons, lookup_const tcons ^ "_" ^ class, ar) ::
blanchet@43085
   404
          arity_clause (class::seen) n (tcons,ars)
blanchet@43085
   405
blanchet@43085
   406
fun multi_arity_clause [] = []
blanchet@43085
   407
  | multi_arity_clause ((tcons, ars) :: tc_arlists) =
blanchet@43085
   408
      arity_clause [] 1 (tcons, ars) @ multi_arity_clause tc_arlists
blanchet@43085
   409
blanchet@43085
   410
(*Generate all pairs (tycon,class,sorts) such that tycon belongs to class in theory thy
blanchet@43085
   411
  provided its arguments have the corresponding sorts.*)
blanchet@43085
   412
fun type_class_pairs thy tycons classes =
blanchet@43093
   413
  let
blanchet@43093
   414
    val alg = Sign.classes_of thy
blanchet@43093
   415
    fun domain_sorts tycon = Sorts.mg_domain alg tycon o single
blanchet@43093
   416
    fun add_class tycon class =
blanchet@43093
   417
      cons (class, domain_sorts tycon class)
blanchet@43093
   418
      handle Sorts.CLASS_ERROR _ => I
blanchet@43093
   419
    fun try_classes tycon = (tycon, fold (add_class tycon) classes [])
blanchet@43093
   420
  in map try_classes tycons end
blanchet@43085
   421
blanchet@43085
   422
(*Proving one (tycon, class) membership may require proving others, so iterate.*)
blanchet@43085
   423
fun iter_type_class_pairs _ _ [] = ([], [])
blanchet@43085
   424
  | iter_type_class_pairs thy tycons classes =
blanchet@43085
   425
      let val cpairs = type_class_pairs thy tycons classes
blanchet@43085
   426
          val newclasses = union_all (union_all (union_all (map (map #2 o #2) cpairs)))
blanchet@43085
   427
            |> subtract (op =) classes |> subtract (op =) HOLogic.typeS
blanchet@43085
   428
          val (classes', cpairs') = iter_type_class_pairs thy tycons newclasses
blanchet@43093
   429
      in (union (op =) classes' classes, union (op =) cpairs' cpairs) end
blanchet@43085
   430
blanchet@43085
   431
fun make_arity_clauses thy tycons =
blanchet@43085
   432
  iter_type_class_pairs thy tycons ##> multi_arity_clause
blanchet@43085
   433
blanchet@43085
   434
blanchet@43085
   435
(** Isabelle class relations **)
blanchet@43085
   436
blanchet@43086
   437
type class_rel_clause =
blanchet@43086
   438
  {name: string,
blanchet@43086
   439
   subclass: name,
blanchet@43086
   440
   superclass: name}
blanchet@43085
   441
blanchet@43085
   442
(*Generate all pairs (sub,super) such that sub is a proper subclass of super in theory thy.*)
blanchet@43085
   443
fun class_pairs _ [] _ = []
blanchet@43085
   444
  | class_pairs thy subs supers =
blanchet@43085
   445
      let
blanchet@43085
   446
        val class_less = Sorts.class_less (Sign.classes_of thy)
blanchet@43085
   447
        fun add_super sub super = class_less (sub, super) ? cons (sub, super)
blanchet@43085
   448
        fun add_supers sub = fold (add_super sub) supers
blanchet@43085
   449
      in fold add_supers subs [] end
blanchet@43085
   450
blanchet@43085
   451
fun make_class_rel_clause (sub,super) =
blanchet@43086
   452
  {name = sub ^ "_" ^ super,
blanchet@43086
   453
   subclass = `make_type_class sub,
blanchet@43086
   454
   superclass = `make_type_class super}
blanchet@43085
   455
blanchet@43085
   456
fun make_class_rel_clauses thy subs supers =
blanchet@43093
   457
  map make_class_rel_clause (class_pairs thy subs supers)
blanchet@43085
   458
blanchet@43085
   459
datatype combterm =
blanchet@43085
   460
  CombConst of name * typ * typ list |
blanchet@43085
   461
  CombVar of name * typ |
blanchet@43085
   462
  CombApp of combterm * combterm
blanchet@43085
   463
blanchet@43085
   464
fun combtyp_of (CombConst (_, T, _)) = T
blanchet@43085
   465
  | combtyp_of (CombVar (_, T)) = T
blanchet@43085
   466
  | combtyp_of (CombApp (t1, _)) = snd (dest_funT (combtyp_of t1))
blanchet@43085
   467
blanchet@43085
   468
(*gets the head of a combinator application, along with the list of arguments*)
blanchet@43085
   469
fun strip_combterm_comb u =
blanchet@43085
   470
    let fun stripc (CombApp(t,u), ts) = stripc (t, u::ts)
blanchet@43085
   471
        |   stripc  x =  x
blanchet@43085
   472
    in stripc(u,[]) end
blanchet@43085
   473
blanchet@43085
   474
fun atyps_of T = fold_atyps (insert (op =)) T []
blanchet@43085
   475
blanchet@43085
   476
fun new_skolem_const_name s num_T_args =
blanchet@43085
   477
  [new_skolem_const_prefix, s, string_of_int num_T_args]
blanchet@43085
   478
  |> space_implode Long_Name.separator
blanchet@43085
   479
blanchet@43085
   480
(* Converts a term (with combinators) into a combterm. Also accumulates sort
blanchet@43085
   481
   infomation. *)
blanchet@43085
   482
fun combterm_from_term thy bs (P $ Q) =
blanchet@43085
   483
    let
blanchet@43085
   484
      val (P', P_atomics_Ts) = combterm_from_term thy bs P
blanchet@43085
   485
      val (Q', Q_atomics_Ts) = combterm_from_term thy bs Q
blanchet@43085
   486
    in (CombApp (P', Q'), union (op =) P_atomics_Ts Q_atomics_Ts) end
blanchet@43085
   487
  | combterm_from_term thy _ (Const (c, T)) =
blanchet@43085
   488
    let
blanchet@43085
   489
      val tvar_list =
blanchet@43085
   490
        (if String.isPrefix old_skolem_const_prefix c then
blanchet@43085
   491
           [] |> Term.add_tvarsT T |> map TVar
blanchet@43085
   492
         else
blanchet@43085
   493
           (c, T) |> Sign.const_typargs thy)
blanchet@43085
   494
      val c' = CombConst (`make_fixed_const c, T, tvar_list)
blanchet@43085
   495
    in (c', atyps_of T) end
blanchet@43085
   496
  | combterm_from_term _ _ (Free (v, T)) =
blanchet@43085
   497
    (CombConst (`make_fixed_var v, T, []), atyps_of T)
blanchet@43085
   498
  | combterm_from_term _ _ (Var (v as (s, _), T)) =
blanchet@43085
   499
    (if String.isPrefix Meson_Clausify.new_skolem_var_prefix s then
blanchet@43085
   500
       let
blanchet@43085
   501
         val Ts = T |> strip_type |> swap |> op ::
blanchet@43085
   502
         val s' = new_skolem_const_name s (length Ts)
blanchet@43085
   503
       in CombConst (`make_fixed_const s', T, Ts) end
blanchet@43085
   504
     else
blanchet@43085
   505
       CombVar ((make_schematic_var v, s), T), atyps_of T)
blanchet@43085
   506
  | combterm_from_term _ bs (Bound j) =
blanchet@43085
   507
    nth bs j
blanchet@43085
   508
    |> (fn (s, T) => (CombConst (`make_bound_var s, T, []), atyps_of T))
blanchet@43085
   509
  | combterm_from_term _ _ (Abs _) = raise Fail "HOL clause: Abs"
blanchet@43085
   510
blanchet@43085
   511
datatype locality = General | Intro | Elim | Simp | Local | Assum | Chained
blanchet@43085
   512
blanchet@43085
   513
(* (quasi-)underapproximation of the truth *)
blanchet@43085
   514
fun is_locality_global Local = false
blanchet@43085
   515
  | is_locality_global Assum = false
blanchet@43085
   516
  | is_locality_global Chained = false
blanchet@43085
   517
  | is_locality_global _ = true
blanchet@43085
   518
blanchet@42613
   519
datatype polymorphism = Polymorphic | Monomorphic | Mangled_Monomorphic
blanchet@42613
   520
datatype type_level =
blanchet@42613
   521
  All_Types | Nonmonotonic_Types | Finite_Types | Const_Arg_Types | No_Types
blanchet@43128
   522
datatype type_heaviness = Heavyweight | Lightweight
blanchet@42613
   523
blanchet@43102
   524
datatype type_sys =
blanchet@42722
   525
  Simple_Types of type_level |
blanchet@42837
   526
  Preds of polymorphism * type_level * type_heaviness |
blanchet@42837
   527
  Tags of polymorphism * type_level * type_heaviness
blanchet@42613
   528
blanchet@42689
   529
fun try_unsuffixes ss s =
blanchet@42689
   530
  fold (fn s' => fn NONE => try (unsuffix s') s | some => some) ss NONE
blanchet@42689
   531
blanchet@42613
   532
fun type_sys_from_string s =
blanchet@42722
   533
  (case try (unprefix "poly_") s of
blanchet@42722
   534
     SOME s => (SOME Polymorphic, s)
blanchet@42613
   535
   | NONE =>
blanchet@42613
   536
     case try (unprefix "mono_") s of
blanchet@42722
   537
       SOME s => (SOME Monomorphic, s)
blanchet@42722
   538
     | NONE =>
blanchet@42722
   539
       case try (unprefix "mangled_") s of
blanchet@42722
   540
         SOME s => (SOME Mangled_Monomorphic, s)
blanchet@42722
   541
       | NONE => (NONE, s))
blanchet@42613
   542
  ||> (fn s =>
blanchet@42689
   543
          (* "_query" and "_bang" are for the ASCII-challenged Mirabelle. *)
blanchet@42689
   544
          case try_unsuffixes ["?", "_query"] s of
blanchet@42613
   545
            SOME s => (Nonmonotonic_Types, s)
blanchet@42613
   546
          | NONE =>
blanchet@42689
   547
            case try_unsuffixes ["!", "_bang"] s of
blanchet@42613
   548
              SOME s => (Finite_Types, s)
blanchet@42613
   549
            | NONE => (All_Types, s))
blanchet@42828
   550
  ||> apsnd (fn s =>
blanchet@42837
   551
                case try (unsuffix "_heavy") s of
blanchet@43128
   552
                  SOME s => (Heavyweight, s)
blanchet@43128
   553
                | NONE => (Lightweight, s))
blanchet@42837
   554
  |> (fn (poly, (level, (heaviness, core))) =>
blanchet@42837
   555
         case (core, (poly, level, heaviness)) of
blanchet@43128
   556
           ("simple", (NONE, _, Lightweight)) => Simple_Types level
blanchet@42854
   557
         | ("preds", (SOME poly, _, _)) => Preds (poly, level, heaviness)
blanchet@42851
   558
         | ("tags", (SOME Polymorphic, All_Types, _)) =>
blanchet@42854
   559
           Tags (Polymorphic, All_Types, heaviness)
blanchet@42886
   560
         | ("tags", (SOME Polymorphic, _, _)) =>
blanchet@42886
   561
           (* The actual light encoding is very unsound. *)
blanchet@43128
   562
           Tags (Polymorphic, level, Heavyweight)
blanchet@42854
   563
         | ("tags", (SOME poly, _, _)) => Tags (poly, level, heaviness)
blanchet@43128
   564
         | ("args", (SOME poly, All_Types (* naja *), Lightweight)) =>
blanchet@43128
   565
           Preds (poly, Const_Arg_Types, Lightweight)
blanchet@43128
   566
         | ("erased", (NONE, All_Types (* naja *), Lightweight)) =>
blanchet@43128
   567
           Preds (Polymorphic, No_Types, Lightweight)
blanchet@42753
   568
         | _ => raise Same.SAME)
blanchet@42753
   569
  handle Same.SAME => error ("Unknown type system: " ^ quote s ^ ".")
blanchet@42613
   570
blanchet@42722
   571
fun polymorphism_of_type_sys (Simple_Types _) = Mangled_Monomorphic
blanchet@42828
   572
  | polymorphism_of_type_sys (Preds (poly, _, _)) = poly
blanchet@42828
   573
  | polymorphism_of_type_sys (Tags (poly, _, _)) = poly
blanchet@42613
   574
blanchet@42722
   575
fun level_of_type_sys (Simple_Types level) = level
blanchet@42828
   576
  | level_of_type_sys (Preds (_, level, _)) = level
blanchet@42828
   577
  | level_of_type_sys (Tags (_, level, _)) = level
blanchet@42828
   578
blanchet@43128
   579
fun heaviness_of_type_sys (Simple_Types _) = Heavyweight
blanchet@42837
   580
  | heaviness_of_type_sys (Preds (_, _, heaviness)) = heaviness
blanchet@42837
   581
  | heaviness_of_type_sys (Tags (_, _, heaviness)) = heaviness
blanchet@42831
   582
blanchet@42687
   583
fun is_type_level_virtually_sound level =
blanchet@42687
   584
  level = All_Types orelse level = Nonmonotonic_Types
blanchet@42613
   585
val is_type_sys_virtually_sound =
blanchet@42613
   586
  is_type_level_virtually_sound o level_of_type_sys
blanchet@42613
   587
blanchet@42613
   588
fun is_type_level_fairly_sound level =
blanchet@42613
   589
  is_type_level_virtually_sound level orelse level = Finite_Types
blanchet@42613
   590
val is_type_sys_fairly_sound = is_type_level_fairly_sound o level_of_type_sys
blanchet@42613
   591
blanchet@42994
   592
fun is_setting_higher_order THF (Simple_Types _) = true
blanchet@42994
   593
  | is_setting_higher_order _ _ = false
blanchet@42994
   594
blanchet@43101
   595
fun choose_format formats (Simple_Types level) =
blanchet@43101
   596
    if member (op =) formats THF then (THF, Simple_Types level)
blanchet@43101
   597
    else if member (op =) formats TFF then (TFF, Simple_Types level)
blanchet@43128
   598
    else choose_format formats (Preds (Mangled_Monomorphic, level, Heavyweight))
blanchet@43101
   599
  | choose_format formats type_sys =
blanchet@43101
   600
    (case hd formats of
blanchet@43101
   601
       CNF_UEQ =>
blanchet@43101
   602
       (CNF_UEQ, case type_sys of
blanchet@43101
   603
                   Preds stuff =>
blanchet@43101
   604
                   (if is_type_sys_fairly_sound type_sys then Preds else Tags)
blanchet@43101
   605
                       stuff
blanchet@43101
   606
                 | _ => type_sys)
blanchet@43101
   607
     | format => (format, type_sys))
blanchet@43101
   608
blanchet@40114
   609
type translated_formula =
blanchet@38752
   610
  {name: string,
blanchet@42640
   611
   locality: locality,
blanchet@42525
   612
   kind: formula_kind,
blanchet@42562
   613
   combformula: (name, typ, combterm) formula,
blanchet@42562
   614
   atomic_types: typ list}
blanchet@38282
   615
blanchet@42640
   616
fun update_combformula f ({name, locality, kind, combformula, atomic_types}
blanchet@42640
   617
                          : translated_formula) =
blanchet@42640
   618
  {name = name, locality = locality, kind = kind, combformula = f combformula,
blanchet@42562
   619
   atomic_types = atomic_types} : translated_formula
blanchet@42542
   620
blanchet@42558
   621
fun fact_lift f ({combformula, ...} : translated_formula) = f combformula
blanchet@42558
   622
blanchet@43064
   623
val type_instance = Sign.typ_instance o Proof_Context.theory_of
blanchet@43064
   624
blanchet@43064
   625
fun insert_type ctxt get_T x xs =
blanchet@43064
   626
  let val T = get_T x in
blanchet@43064
   627
    if exists (curry (type_instance ctxt) T o get_T) xs then xs
blanchet@43064
   628
    else x :: filter_out (curry (type_instance ctxt o swap) T o get_T) xs
blanchet@43064
   629
  end
blanchet@42677
   630
blanchet@42753
   631
(* The Booleans indicate whether all type arguments should be kept. *)
blanchet@42753
   632
datatype type_arg_policy =
blanchet@42753
   633
  Explicit_Type_Args of bool |
blanchet@42753
   634
  Mangled_Type_Args of bool |
blanchet@42753
   635
  No_Type_Args
blanchet@41136
   636
blanchet@42836
   637
fun should_drop_arg_type_args (Simple_Types _) =
blanchet@42836
   638
    false (* since TFF doesn't support overloading *)
blanchet@42836
   639
  | should_drop_arg_type_args type_sys =
blanchet@42836
   640
    level_of_type_sys type_sys = All_Types andalso
blanchet@43128
   641
    heaviness_of_type_sys type_sys = Heavyweight
blanchet@42831
   642
blanchet@43128
   643
fun general_type_arg_policy (Tags (_, All_Types, Heavyweight)) = No_Type_Args
blanchet@43105
   644
  | general_type_arg_policy type_sys =
blanchet@43105
   645
    if level_of_type_sys type_sys = No_Types then
blanchet@43105
   646
      No_Type_Args
blanchet@43105
   647
    else if polymorphism_of_type_sys type_sys = Mangled_Monomorphic then
blanchet@43105
   648
      Mangled_Type_Args (should_drop_arg_type_args type_sys)
blanchet@43105
   649
    else
blanchet@43105
   650
      Explicit_Type_Args (should_drop_arg_type_args type_sys)
blanchet@42563
   651
blanchet@42951
   652
fun type_arg_policy type_sys s =
blanchet@42951
   653
  if s = @{const_name HOL.eq} orelse
blanchet@42966
   654
     (s = app_op_name andalso level_of_type_sys type_sys = Const_Arg_Types) then
blanchet@42951
   655
    No_Type_Args
blanchet@43105
   656
  else if s = type_tag_name then
blanchet@43105
   657
    Explicit_Type_Args false
blanchet@42951
   658
  else
blanchet@42951
   659
    general_type_arg_policy type_sys
blanchet@42227
   660
blanchet@43085
   661
(*Make literals for sorted type variables*)
blanchet@43098
   662
fun generic_sorts_on_type (_, []) = []
blanchet@43098
   663
  | generic_sorts_on_type ((x, i), s :: ss) =
blanchet@43098
   664
    generic_sorts_on_type ((x, i), ss)
blanchet@43093
   665
    |> (if s = the_single @{sort HOL.type} then
blanchet@43093
   666
          I
blanchet@43093
   667
        else if i = ~1 then
blanchet@43093
   668
          cons (TyLitFree (`make_type_class s, `make_fixed_type_var x))
blanchet@43093
   669
        else
blanchet@43093
   670
          cons (TyLitVar (`make_type_class s,
blanchet@43093
   671
                          (make_schematic_type_var (x, i), x))))
blanchet@43098
   672
fun sorts_on_tfree (TFree (s, S)) = generic_sorts_on_type ((s, ~1), S)
blanchet@43098
   673
  | sorts_on_tfree _ = []
blanchet@43098
   674
fun sorts_on_tvar (TVar z) = generic_sorts_on_type z
blanchet@43098
   675
  | sorts_on_tvar _ = []
blanchet@43085
   676
blanchet@43098
   677
(* Given a list of sorted type variables, return a list of type literals. *)
blanchet@43098
   678
fun raw_type_literals_for_types Ts =
blanchet@43098
   679
  union_all (map sorts_on_tfree Ts @ map sorts_on_tvar Ts)
blanchet@43098
   680
blanchet@43098
   681
fun type_literals_for_types type_sys sorts_on_typ Ts =
blanchet@43098
   682
  if level_of_type_sys type_sys = No_Types then []
blanchet@43098
   683
  else union_all (map sorts_on_typ Ts)
blanchet@41137
   684
blanchet@42534
   685
fun mk_aconns c phis =
blanchet@42534
   686
  let val (phis', phi') = split_last phis in
blanchet@42534
   687
    fold_rev (mk_aconn c) phis' phi'
blanchet@42534
   688
  end
blanchet@38282
   689
fun mk_ahorn [] phi = phi
blanchet@42534
   690
  | mk_ahorn phis psi = AConn (AImplies, [mk_aconns AAnd phis, psi])
blanchet@42522
   691
fun mk_aquant _ [] phi = phi
blanchet@42522
   692
  | mk_aquant q xs (phi as AQuant (q', xs', phi')) =
blanchet@42522
   693
    if q = q' then AQuant (q, xs @ xs', phi') else AQuant (q, xs, phi)
blanchet@42522
   694
  | mk_aquant q xs phi = AQuant (q, xs, phi)
blanchet@38282
   695
blanchet@42522
   696
fun close_universally atom_vars phi =
blanchet@41145
   697
  let
blanchet@41145
   698
    fun formula_vars bounds (AQuant (_, xs, phi)) =
blanchet@42526
   699
        formula_vars (map fst xs @ bounds) phi
blanchet@41145
   700
      | formula_vars bounds (AConn (_, phis)) = fold (formula_vars bounds) phis
blanchet@42522
   701
      | formula_vars bounds (AAtom tm) =
blanchet@42526
   702
        union (op =) (atom_vars tm []
blanchet@42526
   703
                      |> filter_out (member (op =) bounds o fst))
blanchet@42522
   704
  in mk_aquant AForall (formula_vars [] phi []) phi end
blanchet@42522
   705
blanchet@42531
   706
fun combterm_vars (CombApp (tm1, tm2)) = fold combterm_vars [tm1, tm2]
blanchet@42522
   707
  | combterm_vars (CombConst _) = I
blanchet@42574
   708
  | combterm_vars (CombVar (name, T)) = insert (op =) (name, SOME T)
blanchet@42674
   709
fun close_combformula_universally phi = close_universally combterm_vars phi
blanchet@42522
   710
blanchet@42522
   711
fun term_vars (ATerm (name as (s, _), tms)) =
blanchet@42998
   712
  is_tptp_variable s ? insert (op =) (name, NONE) #> fold term_vars tms
blanchet@42674
   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
blanchet@43178
   718
fun fo_term_from_typ format type_sys =
blanchet@42994
   719
  let
blanchet@42994
   720
    fun term (Type (s, Ts)) =
blanchet@43178
   721
      ATerm (case (is_setting_higher_order format type_sys, 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
blanchet@42562
   735
(* This shouldn't clash with anything else. *)
blanchet@42542
   736
val mangled_type_sep = "\000"
blanchet@42542
   737
blanchet@42562
   738
fun generic_mangled_type_name f (ATerm (name, [])) = f name
blanchet@42562
   739
  | generic_mangled_type_name f (ATerm (name, tys)) =
blanchet@42761
   740
    f name ^ "(" ^ space_implode "," (map (generic_mangled_type_name f) tys)
blanchet@42761
   741
    ^ ")"
blanchet@42542
   742
blanchet@42998
   743
val bool_atype = AType (`I tptp_bool_type)
blanchet@42998
   744
blanchet@43085
   745
fun make_simple_type s =
blanchet@43085
   746
  if s = tptp_bool_type orelse s = tptp_fun_type orelse
blanchet@43085
   747
     s = tptp_individual_type then
blanchet@43085
   748
    s
blanchet@43085
   749
  else
blanchet@43085
   750
    simple_type_prefix ^ ascii_of s
blanchet@43085
   751
blanchet@43178
   752
fun ho_type_from_fo_term format type_sys pred_sym ary =
blanchet@42963
   753
  let
blanchet@42963
   754
    fun to_atype ty =
blanchet@42963
   755
      AType ((make_simple_type (generic_mangled_type_name fst ty),
blanchet@42963
   756
              generic_mangled_type_name snd ty))
blanchet@42963
   757
    fun to_afun f1 f2 tys = AFun (f1 (hd tys), f2 (nth tys 1))
blanchet@42998
   758
    fun to_fo 0 ty = if pred_sym then bool_atype else to_atype ty
blanchet@42994
   759
      | to_fo ary (ATerm (_, tys)) = to_afun to_atype (to_fo (ary - 1)) tys
blanchet@42994
   760
    fun to_ho (ty as ATerm ((s, _), tys)) =
blanchet@42994
   761
      if s = tptp_fun_type then to_afun to_ho to_ho tys else to_atype ty
blanchet@43178
   762
  in if is_setting_higher_order format type_sys then to_ho else to_fo ary end
blanchet@42963
   763
blanchet@43178
   764
fun mangled_type format type_sys pred_sym ary =
blanchet@43178
   765
  ho_type_from_fo_term format type_sys pred_sym ary
blanchet@43178
   766
  o fo_term_from_typ format type_sys
blanchet@42963
   767
blanchet@43178
   768
fun mangled_const_name format type_sys T_args (s, s') =
blanchet@42963
   769
  let
blanchet@43178
   770
    val ty_args = map (fo_term_from_typ format type_sys) T_args
blanchet@42963
   771
    fun type_suffix f g =
blanchet@42963
   772
      fold_rev (curry (op ^) o g o prefix mangled_type_sep
blanchet@42963
   773
                o generic_mangled_type_name f) ty_args ""
blanchet@42963
   774
  in (s ^ type_suffix fst ascii_of, s' ^ type_suffix snd I) end
blanchet@42542
   775
blanchet@42542
   776
val parse_mangled_ident =
blanchet@42542
   777
  Scan.many1 (not o member (op =) ["(", ")", ","]) >> implode
blanchet@42542
   778
blanchet@42542
   779
fun parse_mangled_type x =
blanchet@42542
   780
  (parse_mangled_ident
blanchet@42542
   781
   -- Scan.optional ($$ "(" |-- Scan.optional parse_mangled_types [] --| $$ ")")
blanchet@42542
   782
                    [] >> ATerm) x
blanchet@42542
   783
and parse_mangled_types x =
blanchet@42542
   784
  (parse_mangled_type ::: Scan.repeat ($$ "," |-- parse_mangled_type)) x
blanchet@42542
   785
blanchet@42542
   786
fun unmangled_type s =
blanchet@42542
   787
  s |> suffix ")" |> raw_explode
blanchet@42542
   788
    |> Scan.finite Symbol.stopper
blanchet@42542
   789
           (Scan.error (!! (fn _ => raise Fail ("unrecognized mangled type " ^
blanchet@42542
   790
                                                quote s)) parse_mangled_type))
blanchet@42542
   791
    |> fst
blanchet@42542
   792
blanchet@42561
   793
val unmangled_const_name = space_explode mangled_type_sep #> hd
blanchet@42542
   794
fun unmangled_const s =
blanchet@42542
   795
  let val ss = space_explode mangled_type_sep s in
blanchet@42542
   796
    (hd ss, map unmangled_type (tl ss))
blanchet@42542
   797
  end
blanchet@42542
   798
blanchet@43017
   799
fun introduce_proxies format type_sys =
blanchet@42568
   800
  let
blanchet@43017
   801
    fun intro top_level (CombApp (tm1, tm2)) =
blanchet@43017
   802
        CombApp (intro top_level tm1, intro false tm2)
blanchet@43017
   803
      | intro top_level (CombConst (name as (s, _), T, T_args)) =
blanchet@42570
   804
        (case proxify_const s of
blanchet@43159
   805
           SOME proxy_base =>
blanchet@43000
   806
           if top_level orelse is_setting_higher_order format type_sys then
blanchet@43000
   807
             case (top_level, s) of
blanchet@43000
   808
               (_, "c_False") => (`I tptp_false, [])
blanchet@43000
   809
             | (_, "c_True") => (`I tptp_true, [])
blanchet@43000
   810
             | (false, "c_Not") => (`I tptp_not, [])
blanchet@43000
   811
             | (false, "c_conj") => (`I tptp_and, [])
blanchet@43000
   812
             | (false, "c_disj") => (`I tptp_or, [])
blanchet@43000
   813
             | (false, "c_implies") => (`I tptp_implies, [])
blanchet@43000
   814
             | (false, s) =>
blanchet@43017
   815
               if is_tptp_equal s then (`I tptp_equal, [])
blanchet@43017
   816
               else (proxy_base |>> prefix const_prefix, T_args)
blanchet@43000
   817
             | _ => (name, [])
blanchet@42569
   818
           else
blanchet@42574
   819
             (proxy_base |>> prefix const_prefix, T_args)
blanchet@42574
   820
          | NONE => (name, T_args))
blanchet@42574
   821
        |> (fn (name, T_args) => CombConst (name, T, T_args))
blanchet@43017
   822
      | intro _ tm = tm
blanchet@43017
   823
  in intro true end
blanchet@42568
   824
blanchet@42994
   825
fun combformula_from_prop thy format type_sys eq_as_iff =
blanchet@38282
   826
  let
blanchet@42568
   827
    fun do_term bs t atomic_types =
blanchet@41140
   828
      combterm_from_term thy bs (Envir.eta_contract t)
blanchet@42994
   829
      |>> (introduce_proxies format type_sys #> AAtom)
blanchet@42568
   830
      ||> union (op =) atomic_types
blanchet@38282
   831
    fun do_quant bs q s T t' =
blanchet@38518
   832
      let val s = Name.variant (map fst bs) s in
blanchet@38518
   833
        do_formula ((s, T) :: bs) t'
blanchet@42562
   834
        #>> mk_aquant q [(`make_bound_var s, SOME T)]
blanchet@38518
   835
      end
blanchet@38282
   836
    and do_conn bs c t1 t2 =
blanchet@43198
   837
      do_formula bs t1 ##>> do_formula bs t2 #>> uncurry (mk_aconn c)
blanchet@38282
   838
    and do_formula bs t =
blanchet@38282
   839
      case t of
blanchet@43096
   840
        @{const Trueprop} $ t1 => do_formula bs t1
blanchet@43096
   841
      | @{const Not} $ t1 => do_formula bs t1 #>> mk_anot
blanchet@38282
   842
      | Const (@{const_name All}, _) $ Abs (s, T, t') =>
blanchet@38282
   843
        do_quant bs AForall s T t'
blanchet@38282
   844
      | Const (@{const_name Ex}, _) $ Abs (s, T, t') =>
blanchet@38282
   845
        do_quant bs AExists s T t'
haftmann@38795
   846
      | @{const HOL.conj} $ t1 $ t2 => do_conn bs AAnd t1 t2
haftmann@38795
   847
      | @{const HOL.disj} $ t1 $ t2 => do_conn bs AOr t1 t2
haftmann@38786
   848
      | @{const HOL.implies} $ t1 $ t2 => do_conn bs AImplies t1 t2
haftmann@38864
   849
      | Const (@{const_name HOL.eq}, Type (_, [@{typ bool}, _])) $ t1 $ t2 =>
blanchet@41140
   850
        if eq_as_iff then do_conn bs AIff t1 t2 else do_term bs t
blanchet@41140
   851
      | _ => do_term bs t
blanchet@38282
   852
  in do_formula [] end
blanchet@38282
   853
blanchet@42750
   854
fun presimplify_term ctxt =
blanchet@42750
   855
  Skip_Proof.make_thm (Proof_Context.theory_of ctxt)
blanchet@42750
   856
  #> Meson.presimplify ctxt
blanchet@42750
   857
  #> prop_of
blanchet@38282
   858
wenzelm@41491
   859
fun concealed_bound_name j = sledgehammer_weak_prefix ^ string_of_int j
blanchet@38282
   860
fun conceal_bounds Ts t =
blanchet@38282
   861
  subst_bounds (map (Free o apfst concealed_bound_name)
blanchet@38282
   862
                    (0 upto length Ts - 1 ~~ Ts), t)
blanchet@38282
   863
fun reveal_bounds Ts =
blanchet@38282
   864
  subst_atomic (map (fn (j, T) => (Free (concealed_bound_name j, T), Bound j))
blanchet@38282
   865
                    (0 upto length Ts - 1 ~~ Ts))
blanchet@38282
   866
blanchet@42747
   867
fun extensionalize_term ctxt t =
blanchet@42747
   868
  let val thy = Proof_Context.theory_of ctxt in
blanchet@42747
   869
    t |> cterm_of thy |> Meson.extensionalize_conv ctxt
blanchet@42747
   870
      |> prop_of |> Logic.dest_equals |> snd
blanchet@42747
   871
  end
blanchet@38608
   872
blanchet@38282
   873
fun introduce_combinators_in_term ctxt kind t =
wenzelm@42361
   874
  let val thy = Proof_Context.theory_of ctxt in
blanchet@38491
   875
    if Meson.is_fol_term thy t then
blanchet@38491
   876
      t
blanchet@38491
   877
    else
blanchet@38491
   878
      let
blanchet@38491
   879
        fun aux Ts t =
blanchet@38491
   880
          case t of
blanchet@38491
   881
            @{const Not} $ t1 => @{const Not} $ aux Ts t1
blanchet@38491
   882
          | (t0 as Const (@{const_name All}, _)) $ Abs (s, T, t') =>
blanchet@38491
   883
            t0 $ Abs (s, T, aux (T :: Ts) t')
blanchet@38652
   884
          | (t0 as Const (@{const_name All}, _)) $ t1 =>
blanchet@38652
   885
            aux Ts (t0 $ eta_expand Ts t1 1)
blanchet@38491
   886
          | (t0 as Const (@{const_name Ex}, _)) $ Abs (s, T, t') =>
blanchet@38491
   887
            t0 $ Abs (s, T, aux (T :: Ts) t')
blanchet@38652
   888
          | (t0 as Const (@{const_name Ex}, _)) $ t1 =>
blanchet@38652
   889
            aux Ts (t0 $ eta_expand Ts t1 1)
haftmann@38795
   890
          | (t0 as @{const HOL.conj}) $ t1 $ t2 => t0 $ aux Ts t1 $ aux Ts t2
haftmann@38795
   891
          | (t0 as @{const HOL.disj}) $ t1 $ t2 => t0 $ aux Ts t1 $ aux Ts t2
haftmann@38786
   892
          | (t0 as @{const HOL.implies}) $ t1 $ t2 => t0 $ aux Ts t1 $ aux Ts t2
haftmann@38864
   893
          | (t0 as Const (@{const_name HOL.eq}, Type (_, [@{typ bool}, _])))
blanchet@38491
   894
              $ t1 $ t2 =>
blanchet@38491
   895
            t0 $ aux Ts t1 $ aux Ts t2
blanchet@38491
   896
          | _ => if not (exists_subterm (fn Abs _ => true | _ => false) t) then
blanchet@38491
   897
                   t
blanchet@38491
   898
                 else
blanchet@38491
   899
                   t |> conceal_bounds Ts
blanchet@38491
   900
                     |> Envir.eta_contract
blanchet@38491
   901
                     |> cterm_of thy
blanchet@39890
   902
                     |> Meson_Clausify.introduce_combinators_in_cterm
blanchet@38491
   903
                     |> prop_of |> Logic.dest_equals |> snd
blanchet@38491
   904
                     |> reveal_bounds Ts
blanchet@39370
   905
        val (t, ctxt') = Variable.import_terms true [t] ctxt |>> the_single
blanchet@38491
   906
      in t |> aux [] |> singleton (Variable.export_terms ctxt' ctxt) end
blanchet@38491
   907
      handle THM _ =>
blanchet@38491
   908
             (* A type variable of sort "{}" will make abstraction fail. *)
blanchet@38613
   909
             if kind = Conjecture then HOLogic.false_const
blanchet@38613
   910
             else HOLogic.true_const
blanchet@38491
   911
  end
blanchet@38282
   912
blanchet@38282
   913
(* Metis's use of "resolve_tac" freezes the schematic variables. We simulate the
blanchet@42353
   914
   same in Sledgehammer to prevent the discovery of unreplayable proofs. *)
blanchet@38282
   915
fun freeze_term t =
blanchet@38282
   916
  let
blanchet@38282
   917
    fun aux (t $ u) = aux t $ aux u
blanchet@38282
   918
      | aux (Abs (s, T, t)) = Abs (s, T, aux t)
blanchet@38282
   919
      | aux (Var ((s, i), T)) =
blanchet@38282
   920
        Free (sledgehammer_weak_prefix ^ s ^ "_" ^ string_of_int i, T)
blanchet@38282
   921
      | aux t = t
blanchet@38282
   922
  in t |> exists_subterm is_Var t ? aux end
blanchet@38282
   923
blanchet@43096
   924
fun preprocess_prop ctxt presimp kind t =
blanchet@38282
   925
  let
wenzelm@42361
   926
    val thy = Proof_Context.theory_of ctxt
blanchet@38608
   927
    val t = t |> Envir.beta_eta_contract
blanchet@42944
   928
              |> transform_elim_prop
blanchet@41211
   929
              |> Object_Logic.atomize_term thy
blanchet@42563
   930
    val need_trueprop = (fastype_of t = @{typ bool})
blanchet@43096
   931
  in
blanchet@43096
   932
    t |> need_trueprop ? HOLogic.mk_Trueprop
blanchet@43096
   933
      |> Raw_Simplifier.rewrite_term thy (Meson.unfold_set_const_simps ctxt) []
blanchet@43096
   934
      |> extensionalize_term ctxt
blanchet@43096
   935
      |> presimp ? presimplify_term ctxt
blanchet@43120
   936
      |> perhaps (try (HOLogic.dest_Trueprop))
blanchet@43096
   937
      |> introduce_combinators_in_term ctxt kind
blanchet@43096
   938
  end
blanchet@43096
   939
blanchet@43096
   940
(* making fact and conjecture formulas *)
blanchet@43096
   941
fun make_formula thy format type_sys eq_as_iff name loc kind t =
blanchet@43096
   942
  let
blanchet@42962
   943
    val (combformula, atomic_types) =
blanchet@42994
   944
      combformula_from_prop thy format type_sys eq_as_iff t []
blanchet@38282
   945
  in
blanchet@42640
   946
    {name = name, locality = loc, kind = kind, combformula = combformula,
blanchet@42562
   947
     atomic_types = atomic_types}
blanchet@38282
   948
  end
blanchet@38282
   949
blanchet@43096
   950
fun make_fact ctxt format type_sys keep_trivial eq_as_iff preproc presimp
blanchet@42994
   951
              ((name, loc), t) =
blanchet@43096
   952
  let val thy = Proof_Context.theory_of ctxt in
blanchet@43096
   953
    case (keep_trivial,
blanchet@43096
   954
          t |> preproc ? preprocess_prop ctxt presimp Axiom
blanchet@43096
   955
            |> make_formula thy format type_sys eq_as_iff name loc Axiom) of
blanchet@43096
   956
      (false,
blanchet@43096
   957
       formula as {combformula = AAtom (CombConst ((s, _), _, _)), ...}) =>
blanchet@43096
   958
      if s = tptp_true then NONE else SOME formula
blanchet@43096
   959
    | (_, formula) => SOME formula
blanchet@43096
   960
  end
blanchet@42561
   961
blanchet@43096
   962
fun make_conjecture ctxt format prem_kind type_sys preproc ts =
blanchet@43096
   963
  let
blanchet@43096
   964
    val thy = Proof_Context.theory_of ctxt
blanchet@43096
   965
    val last = length ts - 1
blanchet@43096
   966
  in
blanchet@42709
   967
    map2 (fn j => fn t =>
blanchet@42709
   968
             let
blanchet@42709
   969
               val (kind, maybe_negate) =
blanchet@42709
   970
                 if j = last then
blanchet@42709
   971
                   (Conjecture, I)
blanchet@42709
   972
                 else
blanchet@42709
   973
                   (prem_kind,
blanchet@42709
   974
                    if prem_kind = Conjecture then update_combformula mk_anot
blanchet@42709
   975
                    else I)
blanchet@42709
   976
              in
blanchet@43098
   977
                t |> preproc ? (preprocess_prop ctxt true kind #> freeze_term)
blanchet@43193
   978
                  |> make_formula thy format type_sys (format <> CNF)
blanchet@43193
   979
                                  (string_of_int j) General kind
blanchet@42962
   980
                  |> maybe_negate
blanchet@42709
   981
              end)
blanchet@38613
   982
         (0 upto last) ts
blanchet@38613
   983
  end
blanchet@38282
   984
blanchet@42682
   985
(** Finite and infinite type inference **)
blanchet@42682
   986
blanchet@42886
   987
fun deep_freeze_atyp (TVar (_, S)) = TFree ("v", S)
blanchet@42886
   988
  | deep_freeze_atyp T = T
blanchet@42886
   989
val deep_freeze_type = map_atyps deep_freeze_atyp
blanchet@42886
   990
blanchet@42682
   991
(* Finite types such as "unit", "bool", "bool * bool", and "bool => bool" are
blanchet@42682
   992
   dangerous because their "exhaust" properties can easily lead to unsound ATP
blanchet@42682
   993
   proofs. On the other hand, all HOL infinite types can be given the same
blanchet@42682
   994
   models in first-order logic (via Löwenheim-Skolem). *)
blanchet@42682
   995
blanchet@42886
   996
fun should_encode_type ctxt (nonmono_Ts as _ :: _) _ T =
blanchet@42886
   997
    exists (curry (type_instance ctxt) (deep_freeze_type T)) nonmono_Ts
blanchet@42836
   998
  | should_encode_type _ _ All_Types _ = true
blanchet@42682
   999
  | should_encode_type ctxt _ Finite_Types T = is_type_surely_finite ctxt T
blanchet@42682
  1000
  | should_encode_type _ _ _ _ = false
blanchet@42682
  1001
blanchet@42837
  1002
fun should_predicate_on_type ctxt nonmono_Ts (Preds (_, level, heaviness))
blanchet@42834
  1003
                             should_predicate_on_var T =
blanchet@43128
  1004
    (heaviness = Heavyweight orelse should_predicate_on_var ()) andalso
blanchet@42878
  1005
    should_encode_type ctxt nonmono_Ts level T
blanchet@42834
  1006
  | should_predicate_on_type _ _ _ _ _ = false
blanchet@42682
  1007
blanchet@42836
  1008
fun is_var_or_bound_var (CombConst ((s, _), _, _)) =
blanchet@42836
  1009
    String.isPrefix bound_var_prefix s
blanchet@42836
  1010
  | is_var_or_bound_var (CombVar _) = true
blanchet@42836
  1011
  | is_var_or_bound_var _ = false
blanchet@42836
  1012
blanchet@42829
  1013
datatype tag_site = Top_Level | Eq_Arg | Elsewhere
blanchet@42829
  1014
blanchet@42829
  1015
fun should_tag_with_type _ _ _ Top_Level _ _ = false
blanchet@42837
  1016
  | should_tag_with_type ctxt nonmono_Ts (Tags (_, level, heaviness)) site u T =
blanchet@42837
  1017
    (case heaviness of
blanchet@43128
  1018
       Heavyweight => should_encode_type ctxt nonmono_Ts level T
blanchet@43128
  1019
     | Lightweight =>
blanchet@42836
  1020
       case (site, is_var_or_bound_var u) of
blanchet@42836
  1021
         (Eq_Arg, true) => should_encode_type ctxt nonmono_Ts level T
blanchet@42829
  1022
       | _ => false)
blanchet@42829
  1023
  | should_tag_with_type _ _ _ _ _ _ = false
blanchet@42682
  1024
blanchet@42994
  1025
fun homogenized_type ctxt nonmono_Ts level =
blanchet@42994
  1026
  let
blanchet@42994
  1027
    val should_encode = should_encode_type ctxt nonmono_Ts level
blanchet@42994
  1028
    fun homo 0 T = if should_encode T then T else homo_infinite_type
blanchet@42994
  1029
      | homo ary (Type (@{type_name fun}, [T1, T2])) =
blanchet@42994
  1030
        homo 0 T1 --> homo (ary - 1) T2
blanchet@42994
  1031
      | homo _ _ = raise Fail "expected function type"
blanchet@42994
  1032
  in homo end
blanchet@42682
  1033
blanchet@42573
  1034
(** "hBOOL" and "hAPP" **)
blanchet@41313
  1035
blanchet@42574
  1036
type sym_info =
blanchet@43064
  1037
  {pred_sym : bool, min_ary : int, max_ary : int, types : typ list}
blanchet@42563
  1038
blanchet@43064
  1039
fun add_combterm_syms_to_table ctxt explicit_apply =
blanchet@42558
  1040
  let
blanchet@43064
  1041
    fun consider_var_arity const_T var_T max_ary =
blanchet@43064
  1042
      let
blanchet@43064
  1043
        fun iter ary T =
blanchet@43210
  1044
          if ary = max_ary orelse type_instance ctxt (var_T, T) orelse
blanchet@43210
  1045
             type_instance ctxt (T, var_T) then
blanchet@43210
  1046
            ary
blanchet@43210
  1047
          else
blanchet@43210
  1048
            iter (ary + 1) (range_type T)
blanchet@43064
  1049
      in iter 0 const_T end
blanchet@43201
  1050
    fun add_var_or_bound_var T (accum as ((bool_vars, fun_var_Ts), sym_tab)) =
blanchet@43201
  1051
      if explicit_apply = NONE andalso
blanchet@43201
  1052
         (can dest_funT T orelse T = @{typ bool}) then
blanchet@43201
  1053
        let
blanchet@43201
  1054
          val bool_vars' = bool_vars orelse body_type T = @{typ bool}
blanchet@43201
  1055
          fun repair_min_arity {pred_sym, min_ary, max_ary, types} =
blanchet@43201
  1056
            {pred_sym = pred_sym andalso not bool_vars',
blanchet@43213
  1057
             min_ary = fold (fn T' => consider_var_arity T' T) types min_ary,
blanchet@43201
  1058
             max_ary = max_ary, types = types}
blanchet@43201
  1059
          val fun_var_Ts' =
blanchet@43201
  1060
            fun_var_Ts |> can dest_funT T ? insert_type ctxt I T
blanchet@43201
  1061
        in
blanchet@43201
  1062
          if bool_vars' = bool_vars andalso
blanchet@43201
  1063
             pointer_eq (fun_var_Ts', fun_var_Ts) then
blanchet@43201
  1064
            accum
blanchet@43167
  1065
          else
blanchet@43213
  1066
            ((bool_vars', fun_var_Ts'), Symtab.map (K repair_min_arity) sym_tab)
blanchet@43201
  1067
        end
blanchet@43201
  1068
      else
blanchet@43201
  1069
        accum
blanchet@43201
  1070
    fun add top_level tm (accum as ((bool_vars, fun_var_Ts), sym_tab)) =
blanchet@43201
  1071
      let val (head, args) = strip_combterm_comb tm in
blanchet@42558
  1072
        (case head of
blanchet@42563
  1073
           CombConst ((s, _), T, _) =>
blanchet@42558
  1074
           if String.isPrefix bound_var_prefix s then
blanchet@43201
  1075
             add_var_or_bound_var T accum
blanchet@42558
  1076
           else
blanchet@43139
  1077
             let val ary = length args in
blanchet@43201
  1078
               ((bool_vars, fun_var_Ts),
blanchet@43064
  1079
                case Symtab.lookup sym_tab s of
blanchet@43064
  1080
                  SOME {pred_sym, min_ary, max_ary, types} =>
blanchet@43064
  1081
                  let
blanchet@43201
  1082
                    val pred_sym =
blanchet@43201
  1083
                      pred_sym andalso top_level andalso not bool_vars
blanchet@43064
  1084
                    val types' = types |> insert_type ctxt I T
blanchet@43064
  1085
                    val min_ary =
blanchet@43064
  1086
                      if is_some explicit_apply orelse
blanchet@43064
  1087
                         pointer_eq (types', types) then
blanchet@43064
  1088
                        min_ary
blanchet@43064
  1089
                      else
blanchet@43201
  1090
                        fold (consider_var_arity T) fun_var_Ts min_ary
blanchet@43064
  1091
                  in
blanchet@43201
  1092
                    Symtab.update (s, {pred_sym = pred_sym,
blanchet@43064
  1093
                                       min_ary = Int.min (ary, min_ary),
blanchet@43064
  1094
                                       max_ary = Int.max (ary, max_ary),
blanchet@43064
  1095
                                       types = types'})
blanchet@43064
  1096
                                  sym_tab
blanchet@43064
  1097
                  end
blanchet@43064
  1098
                | NONE =>
blanchet@43064
  1099
                  let
blanchet@43201
  1100
                    val pred_sym = top_level andalso not bool_vars
blanchet@43064
  1101
                    val min_ary =
blanchet@43064
  1102
                      case explicit_apply of
blanchet@43064
  1103
                        SOME true => 0
blanchet@43064
  1104
                      | SOME false => ary
blanchet@43201
  1105
                      | NONE => fold (consider_var_arity T) fun_var_Ts ary
blanchet@43064
  1106
                  in
blanchet@43201
  1107
                    Symtab.update_new (s, {pred_sym = pred_sym,
blanchet@43064
  1108
                                           min_ary = min_ary, max_ary = ary,
blanchet@43064
  1109
                                           types = [T]})
blanchet@43064
  1110
                                      sym_tab
blanchet@43064
  1111
                  end)
blanchet@43064
  1112
             end
blanchet@43201
  1113
         | CombVar (_, T) => add_var_or_bound_var T accum
blanchet@43064
  1114
         | _ => accum)
blanchet@43064
  1115
        |> fold (add false) args
blanchet@42558
  1116
      end
blanchet@43064
  1117
  in add true end
blanchet@43064
  1118
fun add_fact_syms_to_table ctxt explicit_apply =
blanchet@43064
  1119
  fact_lift (formula_fold NONE
blanchet@43064
  1120
                          (K (add_combterm_syms_to_table ctxt explicit_apply)))
blanchet@38282
  1121
blanchet@43139
  1122
val default_sym_tab_entries : (string * sym_info) list =
blanchet@43174
  1123
  (prefixed_predicator_name,
blanchet@43139
  1124
   {pred_sym = true, min_ary = 1, max_ary = 1, types = []}) ::
blanchet@42568
  1125
  ([tptp_false, tptp_true]
blanchet@43139
  1126
   |> map (rpair {pred_sym = true, min_ary = 0, max_ary = 0, types = []})) @
blanchet@43139
  1127
  ([tptp_equal, tptp_old_equal]
blanchet@43139
  1128
   |> map (rpair {pred_sym = true, min_ary = 2, max_ary = 2, types = []}))
blanchet@41140
  1129
blanchet@43064
  1130
fun sym_table_for_facts ctxt explicit_apply facts =
blanchet@43201
  1131
  ((false, []), Symtab.empty)
blanchet@43201
  1132
  |> fold (add_fact_syms_to_table ctxt explicit_apply) facts |> snd
blanchet@43139
  1133
  |> fold Symtab.update default_sym_tab_entries
blanchet@38282
  1134
blanchet@42558
  1135
fun min_arity_of sym_tab s =
blanchet@42558
  1136
  case Symtab.lookup sym_tab s of
blanchet@42574
  1137
    SOME ({min_ary, ...} : sym_info) => min_ary
blanchet@42558
  1138
  | NONE =>
blanchet@42558
  1139
    case strip_prefix_and_unascii const_prefix s of
blanchet@42547
  1140
      SOME s =>
blanchet@42570
  1141
      let val s = s |> unmangled_const_name |> invert_const in
blanchet@42966
  1142
        if s = predicator_name then 1
blanchet@42966
  1143
        else if s = app_op_name then 2
blanchet@42966
  1144
        else if s = type_pred_name then 1
blanchet@42557
  1145
        else 0
blanchet@42547
  1146
      end
blanchet@42544
  1147
    | NONE => 0
blanchet@38282
  1148
blanchet@38282
  1149
(* True if the constant ever appears outside of the top-level position in
blanchet@38282
  1150
   literals, or if it appears with different arities (e.g., because of different
blanchet@38282
  1151
   type instantiations). If false, the constant always receives all of its
blanchet@38282
  1152
   arguments and is used as a predicate. *)
blanchet@42558
  1153
fun is_pred_sym sym_tab s =
blanchet@42558
  1154
  case Symtab.lookup sym_tab s of
blanchet@42574
  1155
    SOME ({pred_sym, min_ary, max_ary, ...} : sym_info) =>
blanchet@42574
  1156
    pred_sym andalso min_ary = max_ary
blanchet@42558
  1157
  | NONE => false
blanchet@38282
  1158
blanchet@42568
  1159
val predicator_combconst =
blanchet@42966
  1160
  CombConst (`make_fixed_const predicator_name, @{typ "bool => bool"}, [])
blanchet@42568
  1161
fun predicator tm = CombApp (predicator_combconst, tm)
blanchet@42542
  1162
blanchet@42568
  1163
fun introduce_predicators_in_combterm sym_tab tm =
blanchet@42542
  1164
  case strip_combterm_comb tm of
blanchet@42542
  1165
    (CombConst ((s, _), _, _), _) =>
blanchet@42568
  1166
    if is_pred_sym sym_tab s then tm else predicator tm
blanchet@42568
  1167
  | _ => predicator tm
blanchet@42542
  1168
blanchet@42544
  1169
fun list_app head args = fold (curry (CombApp o swap)) args head
blanchet@42544
  1170
blanchet@43130
  1171
val app_op = `make_fixed_const app_op_name
blanchet@43130
  1172
blanchet@42544
  1173
fun explicit_app arg head =
blanchet@42544
  1174
  let
blanchet@42562
  1175
    val head_T = combtyp_of head
blanchet@42693
  1176
    val (arg_T, res_T) = dest_funT head_T
blanchet@42544
  1177
    val explicit_app =
blanchet@43130
  1178
      CombConst (app_op, head_T --> head_T, [arg_T, res_T])
blanchet@42544
  1179
  in list_app explicit_app [head, arg] end
blanchet@42544
  1180
fun list_explicit_app head args = fold explicit_app args head
blanchet@38282
  1181
blanchet@42565
  1182
fun introduce_explicit_apps_in_combterm sym_tab =
blanchet@42544
  1183
  let
blanchet@42544
  1184
    fun aux tm =
blanchet@42544
  1185
      case strip_combterm_comb tm of
blanchet@42544
  1186
        (head as CombConst ((s, _), _, _), args) =>
blanchet@42544
  1187
        args |> map aux
blanchet@42557
  1188
             |> chop (min_arity_of sym_tab s)
blanchet@42544
  1189
             |>> list_app head
blanchet@42544
  1190
             |-> list_explicit_app
blanchet@42544
  1191
      | (head, args) => list_explicit_app head (map aux args)
blanchet@42544
  1192
  in aux end
blanchet@38282
  1193
blanchet@42753
  1194
fun chop_fun 0 T = ([], T)
blanchet@42753
  1195
  | chop_fun n (Type (@{type_name fun}, [dom_T, ran_T])) =
blanchet@42753
  1196
    chop_fun (n - 1) ran_T |>> cons dom_T
blanchet@42753
  1197
  | chop_fun _ _ = raise Fail "unexpected non-function"
blanchet@42753
  1198
blanchet@42780
  1199
fun filter_type_args _ _ _ [] = []
blanchet@42780
  1200
  | filter_type_args thy s arity T_args =
blanchet@42834
  1201
    let
blanchet@42834
  1202
      (* will throw "TYPE" for pseudo-constants *)
blanchet@42966
  1203
      val U = if s = app_op_name then
blanchet@42834
  1204
                @{typ "('a => 'b) => 'a => 'b"} |> Logic.varifyT_global
blanchet@42834
  1205
              else
blanchet@42834
  1206
                s |> Sign.the_const_type thy
blanchet@42834
  1207
    in
blanchet@42781
  1208
      case Term.add_tvarsT (U |> chop_fun arity |> snd) [] of
blanchet@42781
  1209
        [] => []
blanchet@42781
  1210
      | res_U_vars =>
blanchet@42781
  1211
        let val U_args = (s, U) |> Sign.const_typargs thy in
blanchet@42781
  1212
          U_args ~~ T_args
blanchet@42781
  1213
          |> map_filter (fn (U, T) =>
blanchet@42781
  1214
                            if member (op =) res_U_vars (dest_TVar U) then
blanchet@42781
  1215
                              SOME T
blanchet@42781
  1216
                            else
blanchet@42781
  1217
                              NONE)
blanchet@42781
  1218
        end
blanchet@42780
  1219
    end
blanchet@42780
  1220
    handle TYPE _ => T_args
blanchet@42753
  1221
blanchet@43179
  1222
fun enforce_type_arg_policy_in_combterm ctxt format type_sys =
blanchet@42753
  1223
  let
blanchet@42753
  1224
    val thy = Proof_Context.theory_of ctxt
blanchet@42753
  1225
    fun aux arity (CombApp (tm1, tm2)) =
blanchet@42753
  1226
        CombApp (aux (arity + 1) tm1, aux 0 tm2)
blanchet@42753
  1227
      | aux arity (CombConst (name as (s, _), T, T_args)) =
blanchet@43179
  1228
        (case strip_prefix_and_unascii const_prefix s of
blanchet@43179
  1229
           NONE => (name, T_args)
blanchet@43179
  1230
         | SOME s'' =>
blanchet@43179
  1231
           let
blanchet@43179
  1232
             val s'' = invert_const s''
blanchet@43179
  1233
             fun filtered_T_args false = T_args
blanchet@43179
  1234
               | filtered_T_args true = filter_type_args thy s'' arity T_args
blanchet@43179
  1235
           in
blanchet@43179
  1236
             case type_arg_policy type_sys s'' of
blanchet@43179
  1237
               Explicit_Type_Args drop_args =>
blanchet@43179
  1238
               (name, filtered_T_args drop_args)
blanchet@43179
  1239
             | Mangled_Type_Args drop_args =>
blanchet@43179
  1240
               (mangled_const_name format type_sys (filtered_T_args drop_args)
blanchet@43179
  1241
                                   name, [])
blanchet@43179
  1242
             | No_Type_Args => (name, [])
blanchet@43179
  1243
           end)
blanchet@43179
  1244
        |> (fn (name, T_args) => CombConst (name, T, T_args))
blanchet@42753
  1245
      | aux _ tm = tm
blanchet@42753
  1246
  in aux 0 end
blanchet@42573
  1247
blanchet@43179
  1248
fun repair_combterm ctxt format type_sys sym_tab =
blanchet@42994
  1249
  not (is_setting_higher_order format type_sys)
blanchet@42994
  1250
  ? (introduce_explicit_apps_in_combterm sym_tab
blanchet@42994
  1251
     #> introduce_predicators_in_combterm sym_tab)
blanchet@43179
  1252
  #> enforce_type_arg_policy_in_combterm ctxt format type_sys
blanchet@43179
  1253
fun repair_fact ctxt format type_sys sym_tab =
blanchet@42701
  1254
  update_combformula (formula_map
blanchet@43179
  1255
      (repair_combterm ctxt format type_sys sym_tab))
blanchet@42573
  1256
blanchet@42573
  1257
(** Helper facts **)
blanchet@42573
  1258
blanchet@43194
  1259
(* The Boolean indicates that a fairly sound type encoding is needed. *)
blanchet@43085
  1260
val helper_table =
blanchet@43194
  1261
  [(("COMBI", false), @{thms Meson.COMBI_def}),
blanchet@43194
  1262
   (("COMBK", false), @{thms Meson.COMBK_def}),
blanchet@43194
  1263
   (("COMBB", false), @{thms Meson.COMBB_def}),
blanchet@43194
  1264
   (("COMBC", false), @{thms Meson.COMBC_def}),
blanchet@43194
  1265
   (("COMBS", false), @{thms Meson.COMBS_def}),
blanchet@43194
  1266
   (("fequal", true),
blanchet@43085
  1267
    (* This is a lie: Higher-order equality doesn't need a sound type encoding.
blanchet@43085
  1268
       However, this is done so for backward compatibility: Including the
blanchet@43085
  1269
       equality helpers by default in Metis breaks a few existing proofs. *)
blanchet@43194
  1270
    @{thms fequal_def [THEN Meson.iff_to_disjD, THEN conjunct1]
blanchet@43194
  1271
           fequal_def [THEN Meson.iff_to_disjD, THEN conjunct2]}),
blanchet@43194
  1272
   (("fFalse", false), [@{lemma "~ fFalse" by (unfold fFalse_def) fast}]),
blanchet@43194
  1273
   (("fFalse", true), @{thms True_or_False}),
blanchet@43194
  1274
   (("fTrue", false), [@{lemma "fTrue" by (unfold fTrue_def) fast}]),
blanchet@43194
  1275
   (("fTrue", true), @{thms True_or_False}),
blanchet@43194
  1276
   (("fNot", false),
blanchet@43194
  1277
    @{thms fNot_def [THEN Meson.iff_to_disjD, THEN conjunct1]
blanchet@43194
  1278
           fNot_def [THEN Meson.iff_to_disjD, THEN conjunct2]}),
blanchet@43194
  1279
   (("fconj", false),
blanchet@43194
  1280
    @{lemma "~ P | ~ Q | fconj P Q" "~ fconj P Q | P" "~ fconj P Q | Q"
blanchet@43194
  1281
        by (unfold fconj_def) fast+}),
blanchet@43194
  1282
   (("fdisj", false),
blanchet@43194
  1283
    @{lemma "~ P | fdisj P Q" "~ Q | fdisj P Q" "~ fdisj P Q | P | Q"
blanchet@43194
  1284
        by (unfold fdisj_def) fast+}),
blanchet@43194
  1285
   (("fimplies", false),
blanchet@43210
  1286
    @{lemma "P | fimplies P Q" "~ Q | fimplies P Q" "~ fimplies P Q | ~ P | Q"
blanchet@43194
  1287
        by (unfold fimplies_def) fast+}),
blanchet@43194
  1288
   (("If", true), @{thms if_True if_False True_or_False})]
blanchet@43194
  1289
  |> map (apsnd (map zero_var_indexes))
blanchet@43085
  1290
blanchet@43130
  1291
val type_tag = `make_fixed_const type_tag_name
blanchet@43130
  1292
blanchet@43159
  1293
fun type_tag_idempotence_fact () =
blanchet@42573
  1294
  let
blanchet@42573
  1295
    fun var s = ATerm (`I s, [])
blanchet@43159
  1296
    fun tag tm = ATerm (type_tag, [var "T", tm])
blanchet@43207
  1297
    val tagged_a = tag (var "A")
blanchet@42573
  1298
  in
blanchet@43159
  1299
    Formula (type_tag_idempotence_helper_name, Axiom,
blanchet@43207
  1300
             AAtom (ATerm (`I tptp_equal, [tag tagged_a, tagged_a]))
blanchet@42879
  1301
             |> close_formula_universally, simp_info, NONE)
blanchet@42573
  1302
  end
blanchet@42573
  1303
blanchet@43159
  1304
fun should_specialize_helper type_sys t =
blanchet@43159
  1305
  case general_type_arg_policy type_sys of
blanchet@43159
  1306
    Mangled_Type_Args _ => not (null (Term.hidden_polymorphism t))
blanchet@43159
  1307
  | _ => false
blanchet@43159
  1308
blanchet@43064
  1309
fun helper_facts_for_sym ctxt format type_sys (s, {types, ...} : sym_info) =
blanchet@42573
  1310
  case strip_prefix_and_unascii const_prefix s of
blanchet@42573
  1311
    SOME mangled_s =>
blanchet@42573
  1312
    let
blanchet@42573
  1313
      val thy = Proof_Context.theory_of ctxt
blanchet@42573
  1314
      val unmangled_s = mangled_s |> unmangled_const_name
blanchet@43159
  1315
      fun dub_and_inst needs_fairly_sound (th, j) =
blanchet@43159
  1316
        ((unmangled_s ^ "_" ^ string_of_int j ^
blanchet@43159
  1317
          (if mangled_s = unmangled_s then "" else "_" ^ ascii_of mangled_s) ^
blanchet@42893
  1318
          (if needs_fairly_sound then typed_helper_suffix
blanchet@42881
  1319
           else untyped_helper_suffix),
blanchet@42881
  1320
          General),
blanchet@42573
  1321
         let val t = th |> prop_of in
blanchet@43159
  1322
           t |> should_specialize_helper type_sys t
blanchet@43064
  1323
                ? (case types of
blanchet@43064
  1324
                     [T] => specialize_type thy (invert_const unmangled_s, T)
blanchet@43064
  1325
                   | _ => I)
blanchet@42573
  1326
         end)
blanchet@43159
  1327
      val make_facts =
blanchet@43159
  1328
        map_filter (make_fact ctxt format type_sys false false false false)
blanchet@42893
  1329
      val fairly_sound = is_type_sys_fairly_sound type_sys
blanchet@42573
  1330
    in
blanchet@43085
  1331
      helper_table
blanchet@43194
  1332
      |> maps (fn ((helper_s, needs_fairly_sound), ths) =>
blanchet@43159
  1333
                  if helper_s <> unmangled_s orelse
blanchet@42894
  1334
                     (needs_fairly_sound andalso not fairly_sound) then
blanchet@42573
  1335
                    []
blanchet@42573
  1336
                  else
blanchet@42573
  1337
                    ths ~~ (1 upto length ths)
blanchet@43159
  1338
                    |> map (dub_and_inst needs_fairly_sound)
blanchet@43159
  1339
                    |> make_facts)
blanchet@42573
  1340
    end
blanchet@42573
  1341
  | NONE => []
blanchet@42962
  1342
fun helper_facts_for_sym_table ctxt format type_sys sym_tab =
blanchet@42962
  1343
  Symtab.fold_rev (append o helper_facts_for_sym ctxt format type_sys) sym_tab
blanchet@42962
  1344
                  []
blanchet@42573
  1345
blanchet@43085
  1346
(***************************************************************)
blanchet@43085
  1347
(* Type Classes Present in the Axiom or Conjecture Clauses     *)
blanchet@43085
  1348
(***************************************************************)
blanchet@43085
  1349
blanchet@43085
  1350
fun set_insert (x, s) = Symtab.update (x, ()) s
blanchet@43085
  1351
blanchet@43085
  1352
fun add_classes (sorts, cset) = List.foldl set_insert cset (flat sorts)
blanchet@43085
  1353
blanchet@43085
  1354
(* Remove this trivial type class (FIXME: similar code elsewhere) *)
blanchet@43085
  1355
fun delete_type cset = Symtab.delete_safe (the_single @{sort HOL.type}) cset
blanchet@43085
  1356
blanchet@43093
  1357
fun classes_of_terms get_Ts =
blanchet@43121
  1358
  map (map snd o get_Ts)
blanchet@43093
  1359
  #> List.foldl add_classes Symtab.empty
blanchet@43093
  1360
  #> delete_type #> Symtab.keys
blanchet@43085
  1361
blanchet@43093
  1362
val tfree_classes_of_terms = classes_of_terms OldTerm.term_tfrees
blanchet@43093
  1363
val tvar_classes_of_terms = classes_of_terms OldTerm.term_tvars
blanchet@43085
  1364
blanchet@43085
  1365
(*fold type constructors*)
blanchet@43189
  1366
fun fold_type_constrs f (Type (a, Ts)) x =
blanchet@43189
  1367
    fold (fold_type_constrs f) Ts (f (a,x))
blanchet@43189
  1368
  | fold_type_constrs _ _ x = x
blanchet@43085
  1369
blanchet@43085
  1370
(*Type constructors used to instantiate overloaded constants are the only ones needed.*)
blanchet@43189
  1371
fun add_type_constrs_in_term thy =
blanchet@43085
  1372
  let
blanchet@43188
  1373
    fun add (Const (@{const_name Meson.skolem}, _) $ _) = I
blanchet@43181
  1374
      | add (t $ u) = add t #> add u
blanchet@43188
  1375
      | add (Const (x as (s, _))) =
blanchet@43188
  1376
        if String.isPrefix skolem_const_prefix s then I
blanchet@43189
  1377
        else x |> Sign.const_typargs thy |> fold (fold_type_constrs set_insert)
blanchet@43181
  1378
      | add (Abs (_, _, u)) = add u
blanchet@43181
  1379
      | add _ = I
blanchet@43181
  1380
  in add end
blanchet@43085
  1381
blanchet@43189
  1382
fun type_constrs_of_terms thy ts =
blanchet@43189
  1383
  Symtab.keys (fold (add_type_constrs_in_term thy) ts Symtab.empty)
blanchet@43085
  1384
blanchet@43096
  1385
fun translate_formulas ctxt format prem_kind type_sys preproc hyp_ts concl_t
blanchet@43214
  1386
                       facts =
blanchet@42573
  1387
  let
blanchet@42573
  1388
    val thy = Proof_Context.theory_of ctxt
blanchet@43214
  1389
    val fact_ts = facts |> map (prop_of o snd)
blanchet@42573
  1390
    val (facts, fact_names) =
blanchet@43214
  1391
      facts |> map (fn (name, th) =>
blanchet@43214
  1392
                        (name, prop_of th)
blanchet@43214
  1393
                        |> make_fact ctxt format type_sys false true true true
blanchet@43214
  1394
                        |> rpair name)
blanchet@43214
  1395
            |> map_filter (try (apfst the))
blanchet@43214
  1396
            |> ListPair.unzip
blanchet@42573
  1397
    (* Remove existing facts from the conjecture, as this can dramatically
blanchet@42573
  1398
       boost an ATP's performance (for some reason). *)
blanchet@43192
  1399
    val hyp_ts =
blanchet@43192
  1400
      hyp_ts
blanchet@43192
  1401
      |> map (fn t => if member (op aconv) fact_ts t then @{prop True} else t)
blanchet@42573
  1402
    val goal_t = Logic.list_implies (hyp_ts, concl_t)
blanchet@42573
  1403
    val all_ts = goal_t :: fact_ts
blanchet@42573
  1404
    val subs = tfree_classes_of_terms all_ts
blanchet@42573
  1405
    val supers = tvar_classes_of_terms all_ts
blanchet@43189
  1406
    val tycons = type_constrs_of_terms thy all_ts
blanchet@42994
  1407
    val conjs =
blanchet@43096
  1408
      hyp_ts @ [concl_t]
blanchet@43096
  1409
      |> make_conjecture ctxt format prem_kind type_sys preproc
blanchet@42573
  1410
    val (supers', arity_clauses) =
blanchet@42589
  1411
      if level_of_type_sys type_sys = No_Types then ([], [])
blanchet@42573
  1412
      else make_arity_clauses thy tycons supers
blanchet@42573
  1413
    val class_rel_clauses = make_class_rel_clauses thy subs supers'
blanchet@42573
  1414
  in
blanchet@42573
  1415
    (fact_names |> map single, (conjs, facts, class_rel_clauses, arity_clauses))
blanchet@42573
  1416
  end
blanchet@42573
  1417
blanchet@42573
  1418
fun fo_literal_from_type_literal (TyLitVar (class, name)) =
blanchet@42573
  1419
    (true, ATerm (class, [ATerm (name, [])]))
blanchet@42573
  1420
  | fo_literal_from_type_literal (TyLitFree (class, name)) =
blanchet@42573
  1421
    (true, ATerm (class, [ATerm (name, [])]))
blanchet@42573
  1422
blanchet@42573
  1423
fun formula_from_fo_literal (pos, t) = AAtom t |> not pos ? mk_anot
blanchet@42573
  1424
blanchet@43130
  1425
val type_pred = `make_fixed_const type_pred_name
blanchet@43130
  1426
blanchet@43179
  1427
fun type_pred_combterm ctxt format type_sys T tm =
blanchet@43179
  1428
  CombApp (CombConst (type_pred, T --> @{typ bool}, [T])
blanchet@43179
  1429
           |> enforce_type_arg_policy_in_combterm ctxt format type_sys, tm)
blanchet@42573
  1430
blanchet@42878
  1431
fun var_occurs_positively_naked_in_term _ (SOME false) _ accum = accum
blanchet@42878
  1432
  | var_occurs_positively_naked_in_term name _ (ATerm ((s, _), tms)) accum =
blanchet@43000
  1433
    accum orelse (is_tptp_equal s andalso member (op =) tms (ATerm (name, [])))
blanchet@42878
  1434
fun is_var_nonmonotonic_in_formula _ _ (SOME false) _ = false
blanchet@42878
  1435
  | is_var_nonmonotonic_in_formula pos phi _ name =
blanchet@42878
  1436
    formula_fold pos (var_occurs_positively_naked_in_term name) phi false
blanchet@42834
  1437
blanchet@43178
  1438
fun mk_const_aterm format type_sys x T_args args =
blanchet@43178
  1439
  ATerm (x, map (fo_term_from_typ format type_sys) T_args @ args)
blanchet@42994
  1440
blanchet@42962
  1441
fun tag_with_type ctxt format nonmono_Ts type_sys T tm =
blanchet@43130
  1442
  CombConst (type_tag, T --> T, [T])
blanchet@43179
  1443
  |> enforce_type_arg_policy_in_combterm ctxt format type_sys
blanchet@42962
  1444
  |> term_from_combterm ctxt format nonmono_Ts type_sys Top_Level
blanchet@42829
  1445
  |> (fn ATerm (s, tms) => ATerm (s, tms @ [tm]))
blanchet@42962
  1446
and term_from_combterm ctxt format nonmono_Ts type_sys =
blanchet@42573
  1447
  let
blanchet@42962
  1448
    fun aux site u =
blanchet@42962
  1449
      let
blanchet@42962
  1450
        val (head, args) = strip_combterm_comb u
blanchet@42962
  1451
        val (x as (s, _), T_args) =
blanchet@42962
  1452
          case head of
blanchet@42962
  1453
            CombConst (name, _, T_args) => (name, T_args)
blanchet@42962
  1454
          | CombVar (name, _) => (name, [])
blanchet@42962
  1455
          | CombApp _ => raise Fail "impossible \"CombApp\""
blanchet@43000
  1456
        val arg_site = if site = Top_Level andalso is_tptp_equal s then Eq_Arg
blanchet@42962
  1457
                       else Elsewhere
blanchet@43178
  1458
        val t = mk_const_aterm format type_sys x T_args
blanchet@43178
  1459
                    (map (aux arg_site) args)
blanchet@42962
  1460
        val T = combtyp_of u
blanchet@42962
  1461
      in
blanchet@42962
  1462
        t |> (if should_tag_with_type ctxt nonmono_Ts type_sys site u T then
blanchet@42962
  1463
                tag_with_type ctxt format nonmono_Ts type_sys T
blanchet@42962
  1464
              else
blanchet@42962
  1465
                I)
blanchet@42962
  1466
      end
blanchet@42962
  1467
  in aux end
blanchet@42962
  1468
and formula_from_combformula ctxt format nonmono_Ts type_sys
blanchet@42962
  1469
                             should_predicate_on_var =
blanchet@42829
  1470
  let
blanchet@42962
  1471
    val do_term = term_from_combterm ctxt format nonmono_Ts type_sys Top_Level
blanchet@42573
  1472
    val do_bound_type =
blanchet@42682
  1473
      case type_sys of
blanchet@42722
  1474
        Simple_Types level =>
blanchet@42994
  1475
        homogenized_type ctxt nonmono_Ts level 0
blanchet@43178
  1476
        #> mangled_type format type_sys false 0 #> SOME
blanchet@42682
  1477
      | _ => K NONE
blanchet@42878
  1478
    fun do_out_of_bound_type pos phi universal (name, T) =
blanchet@42834
  1479
      if should_predicate_on_type ctxt nonmono_Ts type_sys
blanchet@42878
  1480
             (fn () => should_predicate_on_var pos phi universal name) T then
blanchet@42834
  1481
        CombVar (name, T)
blanchet@43179
  1482
        |> type_pred_combterm ctxt format type_sys T
blanchet@42878
  1483
        |> do_term |> AAtom |> SOME
blanchet@42573
  1484
      else
blanchet@42573
  1485
        NONE
blanchet@42878
  1486
    fun do_formula pos (AQuant (q, xs, phi)) =
blanchet@42878
  1487
        let
blanchet@42878
  1488
          val phi = phi |> do_formula pos
blanchet@42878
  1489
          val universal = Option.map (q = AExists ? not) pos
blanchet@42878
  1490
        in
blanchet@42834
  1491
          AQuant (q, xs |> map (apsnd (fn NONE => NONE
blanchet@42834
  1492
                                        | SOME T => do_bound_type T)),
blanchet@42834
  1493
                  (if q = AForall then mk_ahorn else fold_rev (mk_aconn AAnd))
blanchet@42834
  1494
                      (map_filter
blanchet@42834
  1495
                           (fn (_, NONE) => NONE
blanchet@42834
  1496
                             | (s, SOME T) =>
blanchet@42878
  1497
                               do_out_of_bound_type pos phi universal (s, T))
blanchet@42878
  1498
                           xs)
blanchet@42834
  1499
                      phi)
blanchet@42834
  1500
        end
blanchet@42878
  1501
      | do_formula pos (AConn conn) = aconn_map pos do_formula conn
blanchet@42878
  1502
      | do_formula _ (AAtom tm) = AAtom (do_term tm)
blanchet@42878
  1503
  in do_formula o SOME end
blanchet@42573
  1504
blanchet@43098
  1505
fun bound_tvars type_sys Ts =
blanchet@42727
  1506
  mk_ahorn (map (formula_from_fo_literal o fo_literal_from_type_literal)
blanchet@43098
  1507
                (type_literals_for_types type_sys sorts_on_tvar Ts))
blanchet@42727
  1508
blanchet@42956
  1509
fun formula_for_fact ctxt format nonmono_Ts type_sys
blanchet@42573
  1510
                     ({combformula, atomic_types, ...} : translated_formula) =
blanchet@42727
  1511
  combformula
blanchet@42727
  1512
  |> close_combformula_universally
blanchet@42962
  1513
  |> formula_from_combformula ctxt format nonmono_Ts type_sys
blanchet@42878
  1514
                              is_var_nonmonotonic_in_formula true
blanchet@43098
  1515
  |> bound_tvars type_sys atomic_types
blanchet@42573
  1516
  |> close_formula_universally
blanchet@42573
  1517
blanchet@42573
  1518
(* Each fact is given a unique fact number to avoid name clashes (e.g., because
blanchet@42573
  1519
   of monomorphization). The TPTP explicitly forbids name clashes, and some of
blanchet@42573
  1520
   the remote provers might care. *)
blanchet@43159
  1521
fun formula_line_for_fact ctxt format prefix encode freshen nonmono_Ts type_sys
blanchet@42640
  1522
                          (j, formula as {name, locality, kind, ...}) =
blanchet@43159
  1523
  Formula (prefix ^
blanchet@43159
  1524
           (if freshen andalso
blanchet@43159
  1525
               polymorphism_of_type_sys type_sys <> Polymorphic then
blanchet@43159
  1526
              string_of_int j ^ "_"
blanchet@43159
  1527
            else
blanchet@43159
  1528
              "") ^ encode name,
blanchet@42956
  1529
           kind, formula_for_fact ctxt format nonmono_Ts type_sys formula, NONE,
blanchet@42879
  1530
           case locality of
blanchet@42879
  1531
             Intro => intro_info
blanchet@42879
  1532
           | Elim => elim_info
blanchet@42879
  1533
           | Simp => simp_info
blanchet@42879
  1534
           | _ => NONE)
blanchet@42573
  1535
blanchet@43086
  1536
fun formula_line_for_class_rel_clause ({name, subclass, superclass, ...}
blanchet@43086
  1537
                                       : class_rel_clause) =
blanchet@42573
  1538
  let val ty_arg = ATerm (`I "T", []) in
blanchet@42577
  1539
    Formula (class_rel_clause_prefix ^ ascii_of name, Axiom,
blanchet@42573
  1540
             AConn (AImplies, [AAtom (ATerm (subclass, [ty_arg])),
blanchet@42573
  1541
                               AAtom (ATerm (superclass, [ty_arg]))])
blanchet@42879
  1542
             |> close_formula_universally, intro_info, NONE)
blanchet@42573
  1543
  end
blanchet@42573
  1544
blanchet@42573
  1545
fun fo_literal_from_arity_literal (TConsLit (c, t, args)) =
blanchet@42573
  1546
    (true, ATerm (c, [ATerm (t, map (fn arg => ATerm (arg, [])) args)]))
blanchet@42573
  1547
  | fo_literal_from_arity_literal (TVarLit (c, sort)) =
blanchet@42573
  1548
    (false, ATerm (c, [ATerm (sort, [])]))
blanchet@42573
  1549
blanchet@43086
  1550
fun formula_line_for_arity_clause ({name, prem_lits, concl_lits, ...}
blanchet@43086
  1551
                                   : arity_clause) =
blanchet@42577
  1552
  Formula (arity_clause_prefix ^ ascii_of name, Axiom,
blanchet@42573
  1553
           mk_ahorn (map (formula_from_fo_literal o apfst not
blanchet@42895
  1554
                          o fo_literal_from_arity_literal) prem_lits)
blanchet@42573
  1555
                    (formula_from_fo_literal
blanchet@42895
  1556
                         (fo_literal_from_arity_literal concl_lits))
blanchet@42879
  1557
           |> close_formula_universally, intro_info, NONE)
blanchet@42573
  1558
blanchet@42962
  1559
fun formula_line_for_conjecture ctxt format nonmono_Ts type_sys
blanchet@43098
  1560
        ({name, kind, combformula, atomic_types, ...} : translated_formula) =
blanchet@42577
  1561
  Formula (conjecture_prefix ^ name, kind,
blanchet@42962
  1562
           formula_from_combformula ctxt format nonmono_Ts type_sys
blanchet@42939
  1563
               is_var_nonmonotonic_in_formula false
blanchet@42939
  1564
               (close_combformula_universally combformula)
blanchet@43098
  1565
           |> bound_tvars type_sys atomic_types
blanchet@42573
  1566
           |> close_formula_universally, NONE, NONE)
blanchet@42573
  1567
blanchet@43098
  1568
fun free_type_literals type_sys ({atomic_types, ...} : translated_formula) =
blanchet@43098
  1569
  atomic_types |> type_literals_for_types type_sys sorts_on_tfree
blanchet@42573
  1570
               |> map fo_literal_from_type_literal
blanchet@42573
  1571
blanchet@42573
  1572
fun formula_line_for_free_type j lit =
blanchet@43085
  1573
  Formula (tfree_clause_prefix ^ string_of_int j, Hypothesis,
blanchet@42573
  1574
           formula_from_fo_literal lit, NONE, NONE)
blanchet@43098
  1575
fun formula_lines_for_free_types type_sys facts =
blanchet@42573
  1576
  let
blanchet@43098
  1577
    val litss = map (free_type_literals type_sys) facts
blanchet@42573
  1578
    val lits = fold (union (op =)) litss []
blanchet@42573
  1579
  in map2 formula_line_for_free_type (0 upto length lits - 1) lits end
blanchet@42573
  1580
blanchet@42573
  1581
(** Symbol declarations **)
blanchet@42544
  1582
blanchet@42574
  1583
fun should_declare_sym type_sys pred_sym s =
blanchet@42998
  1584
  is_tptp_user_symbol s andalso not (String.isPrefix bound_var_prefix s) andalso
blanchet@42894
  1585
  (case type_sys of
blanchet@42894
  1586
     Simple_Types _ => true
blanchet@43128
  1587
   | Tags (_, _, Lightweight) => true
blanchet@42894
  1588
   | _ => not pred_sym)
blanchet@38282
  1589
blanchet@42886
  1590
fun sym_decl_table_for_facts ctxt type_sys repaired_sym_tab (conjs, facts) =
blanchet@42574
  1591
  let
blanchet@42698
  1592
    fun add_combterm in_conj tm =
blanchet@42574
  1593
      let val (head, args) = strip_combterm_comb tm in
blanchet@42574
  1594
        (case head of
blanchet@42574
  1595
           CombConst ((s, s'), T, T_args) =>
blanchet@42574
  1596
           let val pred_sym = is_pred_sym repaired_sym_tab s in
blanchet@42574
  1597
             if should_declare_sym type_sys pred_sym s then
blanchet@42576
  1598
               Symtab.map_default (s, [])
blanchet@42886
  1599
                   (insert_type ctxt #3 (s', T_args, T, pred_sym, length args,
blanchet@42886
  1600
                                         in_conj))
blanchet@42574
  1601
             else
blanchet@42574
  1602
               I
blanchet@42574
  1603
           end
blanchet@42574
  1604
         | _ => I)
blanchet@42698
  1605
        #> fold (add_combterm in_conj) args
blanchet@42574
  1606
      end
blanchet@42698
  1607
    fun add_fact in_conj =
blanchet@42834
  1608
      fact_lift (formula_fold NONE (K (add_combterm in_conj)))
blanchet@42698
  1609
  in
blanchet@42698
  1610
    Symtab.empty
blanchet@42698
  1611
    |> is_type_sys_fairly_sound type_sys
blanchet@42698
  1612
       ? (fold (add_fact true) conjs #> fold (add_fact false) facts)
blanchet@42698
  1613
  end
blanchet@42533
  1614
blanchet@42886
  1615
(* These types witness that the type classes they belong to allow infinite
blanchet@42886
  1616
   models and hence that any types with these type classes is monotonic. *)
blanchet@43085
  1617
val known_infinite_types =
blanchet@43085
  1618
  [@{typ nat}, Type ("Int.int", []), @{typ "nat => bool"}]
blanchet@42886
  1619
blanchet@42685
  1620
(* This inference is described in section 2.3 of Claessen et al.'s "Sorting it
blanchet@42685
  1621
   out with monotonicity" paper presented at CADE 2011. *)
blanchet@42886
  1622
fun add_combterm_nonmonotonic_types _ _ (SOME false) _ = I
blanchet@42829
  1623
  | add_combterm_nonmonotonic_types ctxt level _
blanchet@43179
  1624
        (CombApp (CombApp (CombConst ((s, _), Type (_, [T, _]), _), tm1),
blanchet@43179
  1625
                           tm2)) =
blanchet@43000
  1626
    (is_tptp_equal s andalso exists is_var_or_bound_var [tm1, tm2] andalso
blanchet@42829
  1627
     (case level of
blanchet@42886
  1628
        Nonmonotonic_Types =>
blanchet@42886
  1629
        not (is_type_surely_infinite ctxt known_infinite_types T)
blanchet@42829
  1630
      | Finite_Types => is_type_surely_finite ctxt T
blanchet@42886
  1631
      | _ => true)) ? insert_type ctxt I (deep_freeze_type T)
blanchet@42829
  1632
  | add_combterm_nonmonotonic_types _ _ _ _ = I
blanchet@42829
  1633
fun add_fact_nonmonotonic_types ctxt level ({kind, combformula, ...}
blanchet@42829
  1634
                                            : translated_formula) =
blanchet@42834
  1635
  formula_fold (SOME (kind <> Conjecture))
blanchet@42829
  1636
               (add_combterm_nonmonotonic_types ctxt level) combformula
blanchet@42886
  1637
fun nonmonotonic_types_for_facts ctxt type_sys facts =
blanchet@42829
  1638
  let val level = level_of_type_sys type_sys in
blanchet@42886
  1639
    if level = Nonmonotonic_Types orelse level = Finite_Types then
blanchet@42886
  1640
      [] |> fold (add_fact_nonmonotonic_types ctxt level) facts
blanchet@42886
  1641
         (* We must add "bool" in case the helper "True_or_False" is added
blanchet@42886
  1642
            later. In addition, several places in the code rely on the list of
blanchet@42886
  1643
            nonmonotonic types not being empty. *)
blanchet@42886
  1644
         |> insert_type ctxt I @{typ bool}
blanchet@42886
  1645
    else
blanchet@42886
  1646
      []
blanchet@42829
  1647
  end
blanchet@42677
  1648
blanchet@42994
  1649
fun decl_line_for_sym ctxt format nonmono_Ts type_sys s
blanchet@42994
  1650
                      (s', T_args, T, pred_sym, ary, _) =
blanchet@42994
  1651
  let
blanchet@43178
  1652
    val (T_arg_Ts, level) =
blanchet@42994
  1653
      case type_sys of
blanchet@43178
  1654
        Simple_Types level => ([], level)
blanchet@43178
  1655
      | _ => (replicate (length T_args) homo_infinite_type, No_Types)
blanchet@42994
  1656
  in
blanchet@42998
  1657
    Decl (sym_decl_prefix ^ s, (s, s'),
blanchet@42994
  1658
          (T_arg_Ts ---> (T |> homogenized_type ctxt nonmono_Ts level ary))
blanchet@43178
  1659
          |> mangled_type format type_sys pred_sym (length T_arg_Ts + ary))
blanchet@42994
  1660
  end
blanchet@42579
  1661
blanchet@42592
  1662
fun is_polymorphic_type T = fold_atyps (fn TVar _ => K true | _ => I) T false
blanchet@42592
  1663
blanchet@43125
  1664
fun formula_line_for_preds_sym_decl ctxt format conj_sym_kind nonmono_Ts
blanchet@43125
  1665
        type_sys n s j (s', T_args, T, _, ary, in_conj) =
blanchet@42579
  1666
  let
blanchet@42709
  1667
    val (kind, maybe_negate) =
blanchet@42709
  1668
      if in_conj then (conj_sym_kind, conj_sym_kind = Conjecture ? mk_anot)
blanchet@42709
  1669
      else (Axiom, I)
blanchet@42753
  1670
    val (arg_Ts, res_T) = chop_fun ary T
blanchet@42579
  1671
    val bound_names =
blanchet@42579
  1672
      1 upto length arg_Ts |> map (`I o make_bound_var o string_of_int)
blanchet@42829
  1673
    val bounds =
blanchet@42579
  1674
      bound_names ~~ arg_Ts |> map (fn (name, T) => CombConst (name, T, []))
blanchet@42579
  1675
    val bound_Ts =
blanchet@42592
  1676
      arg_Ts |> map (fn T => if n > 1 orelse is_polymorphic_type T then SOME T
blanchet@42592
  1677
                             else NONE)
blanchet@42579
  1678
  in
blanchet@43125
  1679
    Formula (preds_sym_formula_prefix ^ s ^
blanchet@42709
  1680
             (if n > 1 then "_" ^ string_of_int j else ""), kind,
blanchet@42579
  1681
             CombConst ((s, s'), T, T_args)
blanchet@42829
  1682
             |> fold (curry (CombApp o swap)) bounds
blanchet@43179
  1683
             |> type_pred_combterm ctxt format type_sys res_T
blanchet@42963
  1684
             |> AAtom |> mk_aquant AForall (bound_names ~~ bound_Ts)
blanchet@42962
  1685
             |> formula_from_combformula ctxt format nonmono_Ts type_sys
blanchet@42878
  1686
                                         (K (K (K (K true)))) true
blanchet@43098
  1687
             |> n > 1 ? bound_tvars type_sys (atyps_of T)
blanchet@42709
  1688
             |> close_formula_universally
blanchet@42709
  1689
             |> maybe_negate,
blanchet@42879
  1690
             intro_info, NONE)
blanchet@42579
  1691
  end
blanchet@42579
  1692
blanchet@43129
  1693
fun formula_lines_for_lightweight_tags_sym_decl ctxt format conj_sym_kind
blanchet@43129
  1694
        nonmono_Ts type_sys n s (j, (s', T_args, T, pred_sym, ary, in_conj)) =
blanchet@42829
  1695
  let
blanchet@42829
  1696
    val ident_base =
blanchet@43129
  1697
      lightweight_tags_sym_formula_prefix ^ s ^
blanchet@43125
  1698
      (if n > 1 then "_" ^ string_of_int j else "")
blanchet@42852
  1699
    val (kind, maybe_negate) =
blanchet@42852
  1700
      if in_conj then (conj_sym_kind, conj_sym_kind = Conjecture ? mk_anot)
blanchet@42852
  1701
      else (Axiom, I)
blanchet@42829
  1702
    val (arg_Ts, res_T) = chop_fun ary T
blanchet@42829
  1703
    val bound_names =
blanchet@42829
  1704
      1 upto length arg_Ts |> map (`I o make_bound_var o string_of_int)
blanchet@42829
  1705
    val bounds = bound_names |> map (fn name => ATerm (name, []))
blanchet@43178
  1706
    val cst = mk_const_aterm format type_sys (s, s') T_args
blanchet@42830
  1707
    val atomic_Ts = atyps_of T
blanchet@42834
  1708
    fun eq tms =
blanchet@42834
  1709
      (if pred_sym then AConn (AIff, map AAtom tms)
blanchet@43000
  1710
       else AAtom (ATerm (`I tptp_equal, tms)))
blanchet@43098
  1711
      |> bound_tvars type_sys atomic_Ts
blanchet@42830
  1712
      |> close_formula_universally
blanchet@42852
  1713
      |> maybe_negate
blanchet@42836
  1714
    val should_encode = should_encode_type ctxt nonmono_Ts All_Types
blanchet@42962
  1715
    val tag_with = tag_with_type ctxt format nonmono_Ts type_sys
blanchet@42829
  1716
    val add_formula_for_res =
blanchet@42829
  1717
      if should_encode res_T then
blanchet@42852
  1718
        cons (Formula (ident_base ^ "_res", kind,
blanchet@42994
  1719
                       eq [tag_with res_T (cst bounds), cst bounds],
blanchet@42879
  1720
                       simp_info, NONE))
blanchet@42829
  1721
      else
blanchet@42829
  1722
        I
blanchet@42829
  1723
    fun add_formula_for_arg k =
blanchet@42829
  1724
      let val arg_T = nth arg_Ts k in
blanchet@42829
  1725
        if should_encode arg_T then
blanchet@42829
  1726
          case chop k bounds of
blanchet@42829
  1727
            (bounds1, bound :: bounds2) =>
blanchet@42852
  1728
            cons (Formula (ident_base ^ "_arg" ^ string_of_int (k + 1), kind,
blanchet@42994
  1729
                           eq [cst (bounds1 @ tag_with arg_T bound :: bounds2),
blanchet@42994
  1730
                               cst bounds],
blanchet@42879
  1731
                           simp_info, NONE))
blanchet@42829
  1732
          | _ => raise Fail "expected nonempty tail"
blanchet@42829
  1733
        else
blanchet@42829
  1734
          I
blanchet@42829
  1735
      end
blanchet@42829
  1736
  in
blanchet@42834
  1737
    [] |> not pred_sym ? add_formula_for_res
blanchet@42829
  1738
       |> fold add_formula_for_arg (ary - 1 downto 0)
blanchet@42829
  1739
  end
blanchet@42829
  1740
blanchet@42836
  1741
fun result_type_of_decl (_, _, T, _, ary, _) = chop_fun ary T |> snd
blanchet@42836
  1742
blanchet@42956
  1743
fun problem_lines_for_sym_decls ctxt format conj_sym_kind nonmono_Ts type_sys
blanchet@42709
  1744
                                (s, decls) =
blanchet@42998
  1745
  case type_sys of
blanchet@42998
  1746
    Simple_Types _ =>
blanchet@42998
  1747
    decls |> map (decl_line_for_sym ctxt format nonmono_Ts type_sys s)
blanchet@42998
  1748
  | Preds _ =>
blanchet@42998
  1749
    let
blanchet@42998
  1750
      val decls =
blanchet@42998
  1751
        case decls of
blanchet@42998
  1752
          decl :: (decls' as _ :: _) =>
blanchet@42998
  1753
          let val T = result_type_of_decl decl in
blanchet@42998
  1754
            if forall (curry (type_instance ctxt o swap) T
blanchet@42998
  1755
                       o result_type_of_decl) decls' then
blanchet@42998
  1756
              [decl]
blanchet@42998
  1757
            else
blanchet@42998
  1758
              decls
blanchet@42998
  1759
          end
blanchet@42998
  1760
        | _ => decls
blanchet@42998
  1761
      val n = length decls
blanchet@42998
  1762
      val decls =
blanchet@42998
  1763
        decls
blanchet@42998
  1764
        |> filter (should_predicate_on_type ctxt nonmono_Ts type_sys (K true)
blanchet@42998
  1765
                   o result_type_of_decl)
blanchet@42998
  1766
    in
blanchet@42998
  1767
      (0 upto length decls - 1, decls)
blanchet@43125
  1768
      |-> map2 (formula_line_for_preds_sym_decl ctxt format conj_sym_kind
blanchet@43125
  1769
                                                nonmono_Ts type_sys n s)
blanchet@42998
  1770
    end
blanchet@42998
  1771
  | Tags (_, _, heaviness) =>
blanchet@42998
  1772
    (case heaviness of
blanchet@43128
  1773
       Heavyweight => []
blanchet@43128
  1774
     | Lightweight =>
blanchet@42998
  1775
       let val n = length decls in
blanchet@42998
  1776
         (0 upto n - 1 ~~ decls)
blanchet@43129
  1777
         |> maps (formula_lines_for_lightweight_tags_sym_decl ctxt format
blanchet@43129
  1778
                      conj_sym_kind nonmono_Ts type_sys n s)
blanchet@42998
  1779
       end)
blanchet@42579
  1780
blanchet@42956
  1781
fun problem_lines_for_sym_decl_table ctxt format conj_sym_kind nonmono_Ts
blanchet@42956
  1782
                                     type_sys sym_decl_tab =
blanchet@42998
  1783
  sym_decl_tab
blanchet@42998
  1784
  |> Symtab.dest
blanchet@42998
  1785
  |> sort_wrt fst
blanchet@42998
  1786
  |> rpair []
blanchet@42998
  1787
  |-> fold_rev (append o problem_lines_for_sym_decls ctxt format conj_sym_kind
blanchet@42998
  1788
                                                     nonmono_Ts type_sys)
blanchet@42543
  1789
blanchet@43185
  1790
fun needs_type_tag_idempotence (Tags (poly, level, heaviness)) =
blanchet@43185
  1791
    poly <> Mangled_Monomorphic andalso
blanchet@43185
  1792
    ((level = All_Types andalso heaviness = Lightweight) orelse
blanchet@43185
  1793
     level = Nonmonotonic_Types orelse level = Finite_Types)
blanchet@43159
  1794
  | needs_type_tag_idempotence _ = false
blanchet@42831
  1795
blanchet@42939
  1796
fun offset_of_heading_in_problem _ [] j = j
blanchet@42939
  1797
  | offset_of_heading_in_problem needle ((heading, lines) :: problem) j =
blanchet@42939
  1798
    if heading = needle then j
blanchet@42939
  1799
    else offset_of_heading_in_problem needle problem (j + length lines)
blanchet@42939
  1800
blanchet@42998
  1801
val implicit_declsN = "Should-be-implicit typings"
blanchet@42998
  1802
val explicit_declsN = "Explicit typings"
blanchet@41157
  1803
val factsN = "Relevant facts"
blanchet@41157
  1804
val class_relsN = "Class relationships"
blanchet@42543
  1805
val aritiesN = "Arities"
blanchet@41157
  1806
val helpersN = "Helper facts"
blanchet@41157
  1807
val conjsN = "Conjectures"
blanchet@41313
  1808
val free_typesN = "Type variables"
blanchet@41157
  1809
blanchet@42939
  1810
fun prepare_atp_problem ctxt format conj_sym_kind prem_kind type_sys
blanchet@43096
  1811
                        explicit_apply readable_names preproc hyp_ts concl_t
blanchet@43096
  1812
                        facts =
blanchet@38282
  1813
  let
blanchet@43101
  1814
    val (format, type_sys) = choose_format [format] type_sys
blanchet@41313
  1815
    val (fact_names, (conjs, facts, class_rel_clauses, arity_clauses)) =
blanchet@43096
  1816
      translate_formulas ctxt format prem_kind type_sys preproc hyp_ts concl_t
blanchet@43096
  1817
                         facts
blanchet@43064
  1818
    val sym_tab = conjs @ facts |> sym_table_for_facts ctxt explicit_apply
blanchet@42886
  1819
    val nonmono_Ts = conjs @ facts |> nonmonotonic_types_for_facts ctxt type_sys
blanchet@43179
  1820
    val repair = repair_fact ctxt format type_sys sym_tab
blanchet@42682
  1821
    val (conjs, facts) = (conjs, facts) |> pairself (map repair)
blanchet@43064
  1822
    val repaired_sym_tab =
blanchet@43064
  1823
      conjs @ facts |> sym_table_for_facts ctxt (SOME false)
blanchet@42573
  1824
    val helpers =
blanchet@42962
  1825
      repaired_sym_tab |> helper_facts_for_sym_table ctxt format type_sys
blanchet@42962
  1826
                       |> map repair
blanchet@42894
  1827
    val lavish_nonmono_Ts =
blanchet@43213
  1828
      if null nonmono_Ts orelse nonmono_Ts = [@{typ bool}] orelse
blanchet@42894
  1829
         polymorphism_of_type_sys type_sys <> Polymorphic then
blanchet@42894
  1830
        nonmono_Ts
blanchet@42894
  1831
      else
blanchet@42894
  1832
        [TVar (("'a", 0), HOLogic.typeS)]
blanchet@42680
  1833
    val sym_decl_lines =
blanchet@42731
  1834
      (conjs, helpers @ facts)
blanchet@42886
  1835
      |> sym_decl_table_for_facts ctxt type_sys repaired_sym_tab
blanchet@42956
  1836
      |> problem_lines_for_sym_decl_table ctxt format conj_sym_kind
blanchet@42956
  1837
                                          lavish_nonmono_Ts type_sys
blanchet@42881
  1838
    val helper_lines =
blanchet@42956
  1839
      0 upto length helpers - 1 ~~ helpers
blanchet@43159
  1840
      |> map (formula_line_for_fact ctxt format helper_prefix I false
blanchet@43159
  1841
                                    lavish_nonmono_Ts type_sys)
blanchet@43159
  1842
      |> (if needs_type_tag_idempotence type_sys then
blanchet@43159
  1843
            cons (type_tag_idempotence_fact ())
blanchet@43159
  1844
          else
blanchet@43159
  1845
            I)
blanchet@42522
  1846
    (* Reordering these might confuse the proof reconstruction code or the SPASS
blanchet@43039
  1847
       FLOTTER hack. *)
blanchet@38282
  1848
    val problem =
blanchet@42998
  1849
      [(explicit_declsN, sym_decl_lines),
blanchet@42956
  1850
       (factsN,
blanchet@43159
  1851
        map (formula_line_for_fact ctxt format fact_prefix ascii_of true
blanchet@43159
  1852
                                   nonmono_Ts type_sys)
blanchet@42956
  1853
            (0 upto length facts - 1 ~~ facts)),
blanchet@42545
  1854
       (class_relsN, map formula_line_for_class_rel_clause class_rel_clauses),
blanchet@42545
  1855
       (aritiesN, map formula_line_for_arity_clause arity_clauses),
blanchet@42881
  1856
       (helpersN, helper_lines),
blanchet@42962
  1857
       (conjsN,
blanchet@42962
  1858
        map (formula_line_for_conjecture ctxt format nonmono_Ts type_sys)
blanchet@42962
  1859
            conjs),
blanchet@43098
  1860
       (free_typesN, formula_lines_for_free_types type_sys (facts @ conjs))]
blanchet@42543
  1861
    val problem =
blanchet@42561
  1862
      problem
blanchet@43092
  1863
      |> (case format of
blanchet@43092
  1864
            CNF => ensure_cnf_problem
blanchet@43092
  1865
          | CNF_UEQ => filter_cnf_ueq_problem
blanchet@43092
  1866
          | _ => I)
blanchet@42998
  1867
      |> (if is_format_typed format then
blanchet@42998
  1868
            declare_undeclared_syms_in_atp_problem type_decl_prefix
blanchet@42998
  1869
                                                   implicit_declsN
blanchet@42998
  1870
          else
blanchet@42998
  1871
            I)
blanchet@43092
  1872
    val (problem, pool) = problem |> nice_atp_problem readable_names
blanchet@42881
  1873
    val helpers_offset = offset_of_heading_in_problem helpersN problem 0
blanchet@42881
  1874
    val typed_helpers =
blanchet@42881
  1875
      map_filter (fn (j, {name, ...}) =>
blanchet@42881
  1876
                     if String.isSuffix typed_helper_suffix name then SOME j
blanchet@42881
  1877
                     else NONE)
blanchet@42881
  1878
                 ((helpers_offset + 1 upto helpers_offset + length helpers)
blanchet@42881
  1879
                  ~~ helpers)
blanchet@42778
  1880
    fun add_sym_arity (s, {min_ary, ...} : sym_info) =
blanchet@42755
  1881
      if min_ary > 0 then
blanchet@42755
  1882
        case strip_prefix_and_unascii const_prefix s of
blanchet@42755
  1883
          SOME s => Symtab.insert (op =) (s, min_ary)
blanchet@42755
  1884
        | NONE => I
blanchet@42755
  1885
      else
blanchet@42755
  1886
        I
blanchet@38282
  1887
  in
blanchet@38282
  1888
    (problem,
blanchet@38282
  1889
     case pool of SOME the_pool => snd the_pool | NONE => Symtab.empty,
blanchet@42585
  1890
     offset_of_heading_in_problem conjsN problem 0,
blanchet@42541
  1891
     offset_of_heading_in_problem factsN problem 0,
blanchet@42755
  1892
     fact_names |> Vector.fromList,
blanchet@42881
  1893
     typed_helpers,
blanchet@42755
  1894
     Symtab.empty |> Symtab.fold add_sym_arity sym_tab)
blanchet@38282
  1895
  end
blanchet@38282
  1896
blanchet@41313
  1897
(* FUDGE *)
blanchet@41313
  1898
val conj_weight = 0.0
blanchet@41770
  1899
val hyp_weight = 0.1
blanchet@41770
  1900
val fact_min_weight = 0.2
blanchet@41313
  1901
val fact_max_weight = 1.0
blanchet@42608
  1902
val type_info_default_weight = 0.8
blanchet@41313
  1903
blanchet@41313
  1904
fun add_term_weights weight (ATerm (s, tms)) =
blanchet@42998
  1905
  is_tptp_user_symbol s ? Symtab.default (s, weight)
blanchet@41313
  1906
  #> fold (add_term_weights weight) tms
blanchet@42577
  1907
fun add_problem_line_weights weight (Formula (_, _, phi, _, _)) =
blanchet@42834
  1908
    formula_fold NONE (K (add_term_weights weight)) phi
blanchet@42528
  1909
  | add_problem_line_weights _ _ = I
blanchet@41313
  1910
blanchet@41313
  1911
fun add_conjectures_weights [] = I
blanchet@41313
  1912
  | add_conjectures_weights conjs =
blanchet@41313
  1913
    let val (hyps, conj) = split_last conjs in
blanchet@41313
  1914
      add_problem_line_weights conj_weight conj
blanchet@41313
  1915
      #> fold (add_problem_line_weights hyp_weight) hyps
blanchet@41313
  1916
    end
blanchet@41313
  1917
blanchet@41313
  1918
fun add_facts_weights facts =
blanchet@41313
  1919
  let
blanchet@41313
  1920
    val num_facts = length facts
blanchet@41313
  1921
    fun weight_of j =
blanchet@41313
  1922
      fact_min_weight + (fact_max_weight - fact_min_weight) * Real.fromInt j
blanchet@41313
  1923
                        / Real.fromInt num_facts
blanchet@41313
  1924
  in
blanchet@41313
  1925
    map weight_of (0 upto num_facts - 1) ~~ facts
blanchet@41313
  1926
    |> fold (uncurry add_problem_line_weights)
blanchet@41313
  1927
  end
blanchet@41313
  1928
blanchet@41313
  1929
(* Weights are from 0.0 (most important) to 1.0 (least important). *)
blanchet@41313
  1930
fun atp_problem_weights problem =
blanchet@42608
  1931
  let val get = these o AList.lookup (op =) problem in
blanchet@42608
  1932
    Symtab.empty
blanchet@42608
  1933
    |> add_conjectures_weights (get free_typesN @ get conjsN)
blanchet@42608
  1934
    |> add_facts_weights (get factsN)
blanchet@42608
  1935
    |> fold (fold (add_problem_line_weights type_info_default_weight) o get)
blanchet@42998
  1936
            [explicit_declsN, class_relsN, aritiesN]
blanchet@42608
  1937
    |> Symtab.dest
blanchet@42608
  1938
    |> sort (prod_ord Real.compare string_ord o pairself swap)
blanchet@42608
  1939
  end
blanchet@41313
  1940
blanchet@38282
  1941
end;