src/HOL/Tools/Sledgehammer/sledgehammer_fol_clause.ML
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(*  Title:      HOL/Tools/Sledgehammer/sledgehammer_fol_clause.ML
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    Author:     Jia Meng, Cambridge University Computer Laboratory
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    Author:     Jasmin Blanchette, TU Muenchen
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Storing/printing FOL clauses and arity clauses.  Typed equality is
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treated differently.
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FIXME: combine with sledgehammer_hol_clause!
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*)
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signature SLEDGEHAMMER_FOL_CLAUSE =
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sig
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  val type_wrapper_name : 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 tconst_prefix: string
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  val class_prefix: string
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  val union_all: ''a list list -> ''a list
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  val invert_const: string -> string
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  val ascii_of: string -> string
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  val undo_ascii_of: string -> string
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  val strip_prefix: string -> string -> string option
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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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  type name = string * string
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  type name_pool = string Symtab.table * string Symtab.table
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  val empty_name_pool : bool -> name_pool option
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  val pool_map : ('a -> 'b -> 'c * 'b) -> 'a list -> 'b -> 'c list * 'b
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  val nice_name : name -> name_pool option -> string * name_pool option
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  datatype kind = Axiom | Conjecture
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  datatype type_literal =
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    TyLitVar of string * name |
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    TyLitFree of string * name
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  val type_literals_for_types : typ list -> type_literal list
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  datatype arLit =
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      TConsLit of class * string * string list
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    | TVarLit of class * string
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  datatype arity_clause = ArityClause of
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   {axiom_name: string, conclLit: arLit, premLits: arLit list}
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  datatype classrel_clause = ClassrelClause of
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   {axiom_name: string, subclass: class, superclass: class}
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  val make_classrel_clauses: theory -> class list -> class list -> classrel_clause list
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  val make_arity_clauses: theory -> string list -> class list -> class list * arity_clause list
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end
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structure Sledgehammer_FOL_Clause : SLEDGEHAMMER_FOL_CLAUSE =
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struct
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open Sledgehammer_Util
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val type_wrapper_name = "ti"
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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 classrel_clause_prefix = "clsrel_";
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val const_prefix = "c_";
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val tconst_prefix = "tc_";
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val class_prefix = "class_";
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fun union_all xss = fold (union (op =)) xss []
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(* Readable names for the more common symbolic functions. Do not mess with the
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   last nine entries of the table unless you know what you are doing. *)
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val const_trans_table =
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  Symtab.make [(@{const_name "op ="}, "equal"),
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               (@{const_name "op &"}, "and"),
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               (@{const_name "op |"}, "or"),
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               (@{const_name "op -->"}, "implies"),
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               (@{const_name "op :"}, "in"),
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               (@{const_name fequal}, "fequal"),
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               (@{const_name COMBI}, "COMBI"),
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               (@{const_name COMBK}, "COMBK"),
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               (@{const_name COMBB}, "COMBB"),
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               (@{const_name COMBC}, "COMBC"),
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               (@{const_name COMBS}, "COMBS"),
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               (@{const_name True}, "True"),
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               (@{const_name False}, "False"),
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               (@{const_name If}, "If"),
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               (@{type_name "*"}, "prod"),
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               (@{type_name "+"}, "sum")]
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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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  Symtab.update ("fequal", @{const_name "op ="})
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                (Symtab.make (map swap (Symtab.dest const_trans_table)))
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val invert_const = perhaps (Symtab.lookup const_trans_table_inv)
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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 printing characters go to _nnn where nnn is the decimal ASCII code.*)
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val 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 = stringN_of_int (k-1) (n div 10) ^ Int.toString (n mod 10);
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fun ascii_of_c c =
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  if Char.isAlphaNum c then String.str c
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  else if c = #"_" then "__"
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  else if #" " <= c andalso c <= #"/"
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       then "_" ^ String.str (Char.chr (Char.ord c + A_minus_space))
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  else if Char.isPrint c
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       then ("_" ^ stringN_of_int 3 (Char.ord c))  (*fixed width, in case more digits follow*)
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  else ""
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val ascii_of = String.translate ascii_of_c;
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(** Remove ASCII armouring from names in proof files **)
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(*We don't raise error exceptions because this code can run inside the watcher.
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  Also, the errors are "impossible" (hah!)*)
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fun undo_ascii_aux rcs [] = String.implode(rev rcs)
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  | undo_ascii_aux rcs [#"_"] = undo_ascii_aux (#"_"::rcs) []  (*ERROR*)
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      (*Three types of _ escapes: __, _A to _P, _nnn*)
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  | undo_ascii_aux rcs (#"_" :: #"_" :: cs) = undo_ascii_aux (#"_"::rcs) cs
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  | undo_ascii_aux rcs (#"_" :: c :: cs) =
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      if #"A" <= c andalso c<= #"P"  (*translation of #" " to #"/"*)
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      then undo_ascii_aux (Char.chr(Char.ord c - A_minus_space) :: rcs) cs
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      else
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        let val digits = List.take (c::cs, 3) handle Subscript => []
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        in
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            case Int.fromString (String.implode digits) of
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                NONE => undo_ascii_aux (c:: #"_"::rcs) cs  (*ERROR*)
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              | SOME n => undo_ascii_aux (Char.chr n :: rcs) (List.drop (cs, 2))
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        end
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  | undo_ascii_aux rcs (c::cs) = undo_ascii_aux (c::rcs) cs;
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val undo_ascii_of = undo_ascii_aux [] o String.explode;
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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 s1 s =
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  if String.isPrefix s1 s then
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    SOME (undo_ascii_of (String.extract (s, size s1, NONE)))
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  else
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    NONE
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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 error ("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 ^ "_" ^ Int.toString i;
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fun make_schematic_var v = schematic_var_prefix ^ (ascii_of_indexname v);
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fun make_fixed_var x = fixed_var_prefix ^ (ascii_of x);
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fun make_schematic_type_var (x,i) =
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      tvar_prefix ^ (ascii_of_indexname (trim_type_var x,i));
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fun make_fixed_type_var x = tfree_prefix ^ (ascii_of (trim_type_var x));
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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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(* "op =" MUST BE "equal" because it's built into ATPs. *)
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fun make_fixed_const @{const_name "op ="} = "equal"
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  | make_fixed_const c = const_prefix ^ lookup_const c
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fun make_fixed_type_const c = tconst_prefix ^ lookup_const c
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fun make_type_class clas = class_prefix ^ ascii_of clas;
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(**** name pool ****)
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type name = string * string
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type name_pool = string Symtab.table * string Symtab.table
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fun empty_name_pool readable_names =
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  if readable_names then SOME (`I Symtab.empty) else NONE
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fun pool_fold f xs z = pair z #> fold_rev (fn x => uncurry (f x)) xs
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fun pool_map f xs =
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  pool_fold (fn x => fn ys => fn pool => f x pool |>> (fn y => y :: ys)) xs []
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fun add_nice_name full_name nice_prefix j the_pool =
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  let
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    val nice_name = nice_prefix ^ (if j = 0 then "" else "_" ^ Int.toString j)
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  in
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    case Symtab.lookup (snd the_pool) nice_name of
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      SOME full_name' =>
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      if full_name = full_name' then (nice_name, the_pool)
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      else add_nice_name full_name nice_prefix (j + 1) the_pool
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    | NONE =>
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      (nice_name, (Symtab.update_new (full_name, nice_name) (fst the_pool),
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                   Symtab.update_new (nice_name, full_name) (snd the_pool)))
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  end
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fun translate_first_char f s =
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  String.str (f (String.sub (s, 0))) ^ String.extract (s, 1, NONE)
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fun readable_name full_name s =
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  let
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    val s = s |> Long_Name.base_name
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              |> fold remove_all ["\<^sub>", "\<^bsub>", "\<^esub>", "\<^isub>"]
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    val s' = s |> explode |> rev |> dropwhile (curry (op =) "'")
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    val s' =
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      (s' |> rev
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          |> implode
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          |> String.translate
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                 (fn c => if Char.isAlphaNum c orelse c = #"_" then String.str c
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                          else ""))
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      ^ replicate_string (String.size s - length s') "_"
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    val s' =
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      if s' = "" orelse not (Char.isAlpha (String.sub (s', 0))) then "X" ^ s'
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      else s'
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    (* Avoid "equal", since it's built into ATPs; and "op" is very ambiguous
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       ("op &", "op |", etc.). *)
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    val s' = if s' = "equal" orelse s' = "op" then full_name else s'
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  in
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    case (Char.isLower (String.sub (full_name, 0)),
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          Char.isLower (String.sub (s', 0))) of
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      (true, false) => translate_first_char Char.toLower s'
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    | (false, true) => translate_first_char Char.toUpper s'
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    | _ => s'
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  end
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fun nice_name (full_name, _) NONE = (full_name, NONE)
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  | nice_name (full_name, desired_name) (SOME the_pool) =
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    case Symtab.lookup (fst the_pool) full_name of
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      SOME nice_name => (nice_name, SOME the_pool)
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    | NONE => add_nice_name full_name (readable_name full_name desired_name) 0
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                            the_pool
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              |> apsnd SOME
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(**** Definitions and functions for FOL clauses for TPTP format output ****)
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datatype kind = Axiom | Conjecture;
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(**** Isabelle FOL clauses ****)
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(* The first component is the type class; the second is a TVar or TFree. *)
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datatype type_literal =
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  TyLitVar of string * name |
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  TyLitFree of string * name
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exception CLAUSE of string * term;
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(*Make literals for sorted type variables*)
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fun sorts_on_typs_aux (_, [])   = []
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  | sorts_on_typs_aux ((x,i),  s::ss) =
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      let val sorts = sorts_on_typs_aux ((x,i), ss)
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      in
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          if s = "HOL.type" then sorts
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          else if i = ~1 then TyLitFree (make_type_class s, `make_fixed_type_var x) :: sorts
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          else TyLitVar (make_type_class s, (make_schematic_type_var (x,i), x)) :: sorts
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      end;
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fun sorts_on_typs (TFree (a,s)) = sorts_on_typs_aux ((a,~1),s)
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  | sorts_on_typs (TVar (v,s))  = sorts_on_typs_aux (v,s);
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(*Given a list of sorted type variables, return a list of type literals.*)
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fun type_literals_for_types Ts =
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  fold (union (op =)) (map sorts_on_typs Ts) []
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(** make axiom and conjecture clauses. **)
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(**** Isabelle arities ****)
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datatype arLit = TConsLit of class * string * string list
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               | TVarLit of class * string;
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datatype arity_clause =
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  ArityClause of {axiom_name: string, conclLit: arLit, premLits: arLit list}
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fun gen_TVars 0 = []
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  | gen_TVars n = ("T_" ^ Int.toString n) :: gen_TVars (n-1);
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fun pack_sort(_,[])  = []
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  | pack_sort(tvar, "HOL.type"::srt) = pack_sort(tvar, srt)   (*IGNORE sort "type"*)
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  | pack_sort(tvar, cls::srt) =  (cls, tvar) :: pack_sort(tvar, srt);
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(*Arity of type constructor tcon :: (arg1,...,argN)res*)
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fun make_axiom_arity_clause (tcons, axiom_name, (cls,args)) =
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   let val tvars = gen_TVars (length args)
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       val tvars_srts = ListPair.zip (tvars,args)
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   in
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     ArityClause {axiom_name = axiom_name, 
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                  conclLit = TConsLit (cls, make_fixed_type_const tcons, tvars),
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                  premLits = map TVarLit (union_all(map pack_sort tvars_srts))}
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   end;
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(**** Isabelle class relations ****)
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datatype classrel_clause =
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  ClassrelClause of {axiom_name: string, subclass: class, superclass: class}
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(*Generate all pairs (sub,super) such that sub is a proper subclass of super in theory thy.*)
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fun class_pairs _ [] _ = []
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  | class_pairs thy subs supers =
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      let
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        val class_less = Sorts.class_less (Sign.classes_of thy)
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        fun add_super sub super = class_less (sub, super) ? cons (sub, super)
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        fun add_supers sub = fold (add_super sub) supers
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      in fold add_supers subs [] end
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fun make_classrel_clause (sub,super) =
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  ClassrelClause {axiom_name = classrel_clause_prefix ^ ascii_of sub ^ "_" ^
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                               ascii_of super,
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                  subclass = make_type_class sub,
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                  superclass = make_type_class super};
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fun make_classrel_clauses thy subs supers =
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  map make_classrel_clause (class_pairs thy subs supers);
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(** Isabelle arities **)
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fun arity_clause _ _ (_, []) = []
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  | arity_clause seen n (tcons, ("HOL.type",_)::ars) =  (*ignore*)
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      arity_clause seen n (tcons,ars)
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  | arity_clause seen n (tcons, (ar as (class,_)) :: ars) =
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      if member (op =) seen class then (*multiple arities for the same tycon, class pair*)
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          make_axiom_arity_clause (tcons, lookup_const tcons ^ "_" ^ class ^ "_" ^ Int.toString n, ar) ::
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          arity_clause seen (n+1) (tcons,ars)
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      else
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          make_axiom_arity_clause (tcons, lookup_const tcons ^ "_" ^ class, ar) ::
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          arity_clause (class::seen) n (tcons,ars)
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fun multi_arity_clause [] = []
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  | multi_arity_clause ((tcons, ars) :: tc_arlists) =
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      arity_clause [] 1 (tcons, ars) @ multi_arity_clause tc_arlists
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(*Generate all pairs (tycon,class,sorts) such that tycon belongs to class in theory thy
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  provided its arguments have the corresponding sorts.*)
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fun type_class_pairs thy tycons classes =
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  let val alg = Sign.classes_of thy
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      fun domain_sorts tycon = Sorts.mg_domain alg tycon o single
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      fun add_class tycon class =
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        cons (class, domain_sorts tycon class)
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        handle Sorts.CLASS_ERROR _ => I
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      fun try_classes tycon = (tycon, fold (add_class tycon) classes [])
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  in  map try_classes tycons  end;
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(*Proving one (tycon, class) membership may require proving others, so iterate.*)
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fun iter_type_class_pairs _ _ [] = ([], [])
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  | iter_type_class_pairs thy tycons classes =
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      let val cpairs = type_class_pairs thy tycons classes
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          val newclasses = union_all (union_all (union_all (map (map #2 o #2) cpairs)))
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            |> subtract (op =) classes |> subtract (op =) HOLogic.typeS
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          val (classes', cpairs') = iter_type_class_pairs thy tycons newclasses
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      in (union (op =) classes' classes, union (op =) cpairs' cpairs) end;
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fun make_arity_clauses thy tycons classes =
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  let val (classes', cpairs) = iter_type_class_pairs thy tycons classes
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  in  (classes', multi_arity_clause cpairs)  end;
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end;