src/HOL/Tools/ATP/atp_systems.ML
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(*  Title:      HOL/Tools/ATP/atp_systems.ML
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    Author:     Fabian Immler, TU Muenchen
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    Author:     Jasmin Blanchette, TU Muenchen
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Setup for supported ATPs.
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*)
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signature ATP_SYSTEMS =
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sig
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  type failure = ATP_Proof.failure
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  type atp_config =
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    {exec: string * string,
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     required_execs: (string * string) list,
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     arguments: bool -> Time.time -> (unit -> (string * real) list) -> string,
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     has_incomplete_mode: bool,
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     proof_delims: (string * string) list,
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     known_failures: (failure * string) list,
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     default_max_relevant: int,
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     explicit_forall: bool,
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     use_conjecture_for_hypotheses: bool}
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  (* for experimentation purposes -- do not use in production code *)
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  val e_generate_weights : bool Unsynchronized.ref
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  val e_weight_factor : real Unsynchronized.ref
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  val e_default_weight : real Unsynchronized.ref
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  val eN : string
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  val spassN : string
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  val vampireN : string
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  val sine_eN : string
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  val snarkN : string
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  val remote_prefix : string
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  val add_atp : string * atp_config -> theory -> theory
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  val get_atp : theory -> string -> atp_config
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  val available_atps : theory -> string list
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  val is_atp_installed : theory -> string -> bool
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  val refresh_systems_on_tptp : unit -> unit
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  val setup : theory -> theory
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end;
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structure ATP_Systems : ATP_SYSTEMS =
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struct
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open ATP_Proof
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(* ATP configuration *)
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type atp_config =
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  {exec: string * string,
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   required_execs: (string * string) list,
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   arguments: bool -> Time.time -> (unit -> (string * real) list) -> string,
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   has_incomplete_mode: bool,
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   proof_delims: (string * string) list,
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   known_failures: (failure * string) list,
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   default_max_relevant: int,
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   explicit_forall: bool,
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   use_conjecture_for_hypotheses: bool}
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val known_perl_failures =
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  [(CantConnect, "HTTP error"),
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   (NoPerl, "env: perl"),
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   (NoLibwwwPerl, "Can't locate HTTP")]
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(* named ATPs *)
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val eN = "e"
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val spassN = "spass"
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val vampireN = "vampire"
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val sine_eN = "sine_e"
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val snarkN = "snark"
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val remote_prefix = "remote_"
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structure Data = Theory_Data
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(
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  type T = (atp_config * stamp) Symtab.table
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  val empty = Symtab.empty
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  val extend = I
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  fun merge data : T = Symtab.merge (eq_snd op =) data
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    handle Symtab.DUP name => error ("Duplicate ATP: " ^ quote name ^ ".")
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)
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fun to_secs bonus time = (Time.toMilliseconds time + bonus + 999) div 1000
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(* E *)
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(* Give E an extra second to reconstruct the proof. Older versions even get two
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   seconds, because the "eproof" script wrongly subtracted an entire second to
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   account for the overhead of the script itself, which is in fact much
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   lower. *)
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fun e_bonus () =
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  case getenv "E_VERSION" of
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    "" => 2000
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  | version =>
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    if exists (fn s => String.isPrefix s version) ["0.9", "1.0"] then 2000
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    else 1000
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val tstp_proof_delims =
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  ("# SZS output start CNFRefutation.", "# SZS output end CNFRefutation")
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val e_generate_weights = Unsynchronized.ref false
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val e_weight_factor = Unsynchronized.ref 4.0
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val e_default_weight = Unsynchronized.ref 0.5
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fun e_weights weights =
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  if !e_generate_weights then
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    "(1*FunWeight(ConstPrio," ^
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    string_of_int (Real.ceil (!e_default_weight * !e_weight_factor)) ^
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    ",1,1.5,1.5,1.5" ^
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    (weights ()
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     |> map (fn (s, w) => "," ^ s ^ ":" ^
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                          string_of_int (Real.ceil (w * !e_weight_factor)))
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     |> implode) ^ ")+5*AutoDev)"
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  else
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    "AutoDev"
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val e_config : atp_config =
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  {exec = ("E_HOME", "eproof"),
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   required_execs = [],
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   arguments = fn _ => fn timeout => fn weights =>
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     "--tstp-in --tstp-out -l5 -x'" ^ e_weights weights ^ "' -tAutoDev \
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     \--silent --cpu-limit=" ^ string_of_int (to_secs (e_bonus ()) timeout),
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   has_incomplete_mode = false,
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   proof_delims = [tstp_proof_delims],
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   known_failures =
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     [(Unprovable, "SZS status: CounterSatisfiable"),
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      (Unprovable, "SZS status CounterSatisfiable"),
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      (TimedOut, "Failure: Resource limit exceeded (time)"),
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      (TimedOut, "time limit exceeded"),
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      (OutOfResources,
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       "# Cannot determine problem status within resource limit"),
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      (OutOfResources, "SZS status: ResourceOut"),
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      (OutOfResources, "SZS status ResourceOut")],
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   default_max_relevant = 500 (* FUDGE *),
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   explicit_forall = false,
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   use_conjecture_for_hypotheses = true}
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val e = (eN, e_config)
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(* SPASS *)
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(* The "-VarWeight=3" option helps the higher-order problems, probably by
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   counteracting the presence of "hAPP". *)
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val spass_config : atp_config =
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  {exec = ("ISABELLE_ATP", "scripts/spass"),
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   required_execs = [("SPASS_HOME", "SPASS"), ("SPASS_HOME", "tptp2dfg")],
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   arguments = fn complete => fn timeout => fn _ =>
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     ("-Auto -PGiven=0 -PProblem=0 -Splits=0 -FullRed=0 -DocProof \
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      \-VarWeight=3 -TimeLimit=" ^ string_of_int (to_secs 0 timeout))
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     |> not complete ? prefix "-SOS=1 ",
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   has_incomplete_mode = true,
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   proof_delims = [("Here is a proof", "Formulae used in the proof")],
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   known_failures =
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     known_perl_failures @
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     [(IncompleteUnprovable, "SPASS beiseite: Completion found"),
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      (TimedOut, "SPASS beiseite: Ran out of time"),
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      (OutOfResources, "SPASS beiseite: Maximal number of loops exceeded"),
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      (MalformedInput, "Undefined symbol"),
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      (MalformedInput, "Free Variable"),
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      (SpassTooOld, "tptp2dfg"),
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      (InternalError, "Please report this error")],
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   default_max_relevant = 350 (* FUDGE *),
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   explicit_forall = true,
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   use_conjecture_for_hypotheses = true}
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val spass = (spassN, spass_config)
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(* Vampire *)
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val vampire_config : atp_config =
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  {exec = ("VAMPIRE_HOME", "vampire"),
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   required_execs = [],
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   arguments = fn complete => fn timeout => fn _ =>
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     (* This would work too but it's less tested: "--proof tptp " ^ *)
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     "--mode casc -t " ^ string_of_int (to_secs 0 timeout) ^
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     " --thanks \"Andrei and Krystof\" --input_file"
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     |> not complete ? prefix "--sos on ",
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   has_incomplete_mode = true,
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   proof_delims =
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     [("=========== Refutation ==========",
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       "======= End of refutation ======="),
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      ("% SZS output start Refutation", "% SZS output end Refutation"),
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      ("% SZS output start Proof", "% SZS output end Proof")],
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   known_failures =
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     [(Unprovable, "UNPROVABLE"),
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      (IncompleteUnprovable, "CANNOT PROVE"),
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      (TimedOut, "SZS status Timeout"),
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      (Unprovable, "Satisfiability detected"),
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      (Unprovable, "Termination reason: Satisfiable"),
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      (VampireTooOld, "not a valid option"),
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      (Interrupted, "Aborted by signal SIGINT")],
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   default_max_relevant = 400 (* FUDGE *),
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   explicit_forall = false,
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   use_conjecture_for_hypotheses = true}
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val vampire = (vampireN, vampire_config)
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(* Remote ATP invocation via SystemOnTPTP *)
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val systems = Synchronized.var "atp_systems" ([] : string list)
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fun get_systems () =
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  case bash_output "\"$ISABELLE_ATP/scripts/remote_atp\" -w 2>&1" of
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    (output, 0) => split_lines output
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  | (output, _) =>
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    error (case extract_known_failure known_perl_failures output of
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             SOME failure => string_for_failure "ATP" failure
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           | NONE => perhaps (try (unsuffix "\n")) output ^ ".")
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fun find_system name [] systems = find_first (String.isPrefix name) systems
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  | find_system name (version :: versions) systems =
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    case find_first (String.isPrefix (name ^ "---" ^ version)) systems of
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      NONE => find_system name versions systems
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    | res => res
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fun get_system name versions =
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  Synchronized.change_result systems
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      (fn systems => (if null systems then get_systems () else systems)
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                     |> `(find_system name versions))
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fun the_system name versions =
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  case get_system name versions of
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    SOME sys => sys
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  | NONE => error ("System " ^ quote name ^
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                   " is not available at SystemOnTPTP.")
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val max_remote_secs = 240 (* give Geoff Sutcliffe's servers a break *)
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fun remote_config system_name system_versions proof_delims known_failures
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                  default_max_relevant use_conjecture_for_hypotheses
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                  : atp_config =
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  {exec = ("ISABELLE_ATP", "scripts/remote_atp"),
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   required_execs = [],
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   arguments = fn _ => fn timeout => fn _ =>
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     " -t " ^ string_of_int (Int.min (max_remote_secs, (to_secs 0 timeout)))
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     ^ " -s " ^ the_system system_name system_versions,
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   has_incomplete_mode = false,
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   proof_delims = insert (op =) tstp_proof_delims proof_delims,
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   known_failures =
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     known_failures @ known_perl_failures @
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     [(TimedOut, "says Timeout")],
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   default_max_relevant = default_max_relevant,
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   explicit_forall = true,
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   use_conjecture_for_hypotheses = use_conjecture_for_hypotheses}
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fun remotify_config system_name system_versions
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        ({proof_delims, known_failures, default_max_relevant,
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          use_conjecture_for_hypotheses, ...} : atp_config) : atp_config =
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  remote_config system_name system_versions proof_delims known_failures
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                default_max_relevant use_conjecture_for_hypotheses
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fun remote_atp name system_name system_versions proof_delims known_failures
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               default_max_relevant use_conjecture_for_hypotheses =
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  (remote_prefix ^ name,
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   remote_config system_name system_versions proof_delims known_failures
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                 default_max_relevant use_conjecture_for_hypotheses)
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fun remotify_atp (name, config) system_name system_versions =
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  (remote_prefix ^ name, remotify_config system_name system_versions config)
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val remote_e = remotify_atp e "EP" ["1.0", "1.1", "1.2"]
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val remote_vampire = remotify_atp vampire "Vampire" ["0.6", "9.0", "1.0"]
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val remote_sine_e =
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  remote_atp sine_eN "SInE" [] [] [(IncompleteUnprovable, "says Unknown")]
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                600 (* FUDGE *) true
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val remote_snark =
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  remote_atp snarkN "SNARK---" [] [("refutation.", "end_refutation.")] []
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             250 (* FUDGE *) true
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(* Setup *)
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fun add_atp (name, config) thy =
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  Data.map (Symtab.update_new (name, (config, stamp ()))) thy
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  handle Symtab.DUP name => error ("Duplicate ATP: " ^ quote name ^ ".")
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fun get_atp thy name =
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  the (Symtab.lookup (Data.get thy) name) |> fst
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  handle Option.Option => error ("Unknown ATP: " ^ name ^ ".")
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val available_atps = Symtab.keys o Data.get
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fun is_atp_installed thy name =
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  let val {exec, required_execs, ...} = get_atp thy name in
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    forall (curry (op <>) "" o getenv o fst) (exec :: required_execs)
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  end
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fun refresh_systems_on_tptp () =
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  Synchronized.change systems (fn _ => get_systems ())
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val atps = [e, spass, vampire, remote_e, remote_vampire, remote_sine_e,
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            remote_snark]
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val setup = fold add_atp atps
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end;