(*  Title:      HOL/Tools/ATP_Manager/atp_wrapper.ML

    Author:     Fabian Immler, TU Muenchen

Wrapper functions for external ATPs.

*)

signature ATP_WRAPPER =

sig

  type prover = ATP_Manager.prover

  (* hooks for problem files *)

  val destdir : string Config.T

  val problem_prefix : string Config.T

  val measure_runtime : bool Config.T

  val refresh_systems_on_tptp : unit -> unit

  val setup : theory -> theory

end;

structure ATP_Wrapper : ATP_WRAPPER =

struct

open Sledgehammer_HOL_Clause

open Sledgehammer_Fact_Filter

open Sledgehammer_Proof_Reconstruct

open ATP_Manager

(** generic ATP wrapper **)

(* external problem files *)

val (destdir, destdir_setup) = Attrib.config_string "atp_destdir" "";

  (*Empty string means create files in Isabelle's temporary files directory.*)

val (problem_prefix, problem_prefix_setup) =

  Attrib.config_string "atp_problem_prefix" "prob";

val (measure_runtime, measure_runtime_setup) =

  Attrib.config_bool "atp_measure_runtime" false;

(* prover configuration *)

type prover_config =

 {command: Path.T,

  arguments: int -> string,

  failure_strs: string list,

  max_new_clauses: int,

  insert_theory_const: bool,

  emit_structured_proof: bool};

(* basic template *)

fun with_path cleanup after f path =

  Exn.capture f path

  |> tap (fn _ => cleanup path)

  |> Exn.release

  |> tap (after path);

fun find_failure strs proof =

  case filter (fn s => String.isSubstring s proof) strs of

    [] => if is_proof_well_formed proof then NONE

          else SOME "Ill-formed ATP output"

  | (failure :: _) => SOME failure

fun external_prover relevance_filter prepare write cmd args failure_strs

        produce_answer name ({with_full_types, subgoal, goal, axiom_clauses,

                              filtered_clauses}: problem) =

  let

    (* get clauses and prepare them for writing *)

    val (ctxt, (chain_ths, th)) = goal;

    val thy = ProofContext.theory_of ctxt;

    val chain_ths = map (Thm.put_name_hint chained_hint) chain_ths;

    val goal_cls = #1 (Sledgehammer_Fact_Preprocessor.neg_conjecture_clauses ctxt th subgoal);

    val the_filtered_clauses =

      (case filtered_clauses of

        NONE => relevance_filter goal goal_cls

      | SOME fcls => fcls);

    val the_axiom_clauses =

      (case axiom_clauses of

        NONE => the_filtered_clauses

      | SOME axcls => axcls);

    val (thm_names, clauses) =

      prepare goal_cls chain_ths the_axiom_clauses the_filtered_clauses thy;

    (* path to unique problem file *)

    val destdir' = Config.get ctxt destdir;

    val problem_prefix' = Config.get ctxt problem_prefix;

    fun prob_pathname nr =

      let val probfile =

        Path.basic (problem_prefix' ^ serial_string () ^ "_" ^ string_of_int nr)

      in

        if destdir' = "" then File.tmp_path probfile

        else if File.exists (Path.explode destdir')

        then Path.append  (Path.explode destdir') probfile

        else error ("No such directory: " ^ destdir')

      end;

    (* write out problem file and call prover *)

    fun cmd_line probfile =

      if Config.get ctxt measure_runtime

      then (* Warning: suppresses error messages of ATPs *)

        "TIMEFORMAT='%3U'; { time " ^ space_implode " " [File.shell_path cmd,

        args, File.shell_path probfile] ^ " 2> /dev/null" ^ " ; } 2>&1"

      else

        space_implode " " ["exec", File.shell_path cmd, args,

        File.shell_path probfile];

    fun split_time s =

      let

        val split = String.tokens (fn c => str c = "\n");

        val (proof, t) = s |> split |> split_last |> apfst cat_lines;

        fun as_num f = f >> (fst o read_int);

        val num = as_num (Scan.many1 Symbol.is_ascii_digit);

        val digit = Scan.one Symbol.is_ascii_digit;

        val num3 = as_num (digit ::: digit ::: (digit >> single));

        val time = num --| Scan.$$ "." -- num3 >> (fn (a, b) => a * 1000 + b);

        val as_time = the_default 0 o Scan.read Symbol.stopper time o explode;

      in (proof, as_time t) end;

    fun split_time' s =

      if Config.get ctxt measure_runtime then split_time s else (s, 0)

    fun run_on probfile =

      if File.exists cmd then

        write with_full_types probfile clauses

        |> pair (apfst split_time' (bash_output (cmd_line probfile)))

      else error ("Bad executable: " ^ Path.implode cmd);

    (* if problemfile has not been exported, delete problemfile; otherwise export proof, too *)

    fun cleanup probfile = if destdir' = "" then try File.rm probfile else NONE;

    fun export probfile (((proof, _), _), _) =

      if destdir' = "" then ()

      else File.write (Path.explode (Path.implode probfile ^ "_proof")) proof;

    val (((proof, time), rc), conj_pos) =

      with_path cleanup export run_on (prob_pathname subgoal);

    (* check for success and print out some information on failure *)

    val failure = find_failure failure_strs proof;

    val success = rc = 0 andalso is_none failure;

    val (message, real_thm_names) =

      if is_some failure then ("External prover failed.", [])

      else if rc <> 0 then ("External prover failed: " ^ proof, [])

      else apfst (fn s => "Try this command: " ^ s)

        (produce_answer name (proof, thm_names, conj_pos, ctxt, th, subgoal));

  in

    {success = success, message = message,

      theorem_names = real_thm_names, runtime = time, proof = proof,

      internal_thm_names = thm_names, filtered_clauses = the_filtered_clauses}

  end;

(* generic TPTP-based provers *)

fun generic_tptp_prover

        (name, {command, arguments, failure_strs, max_new_clauses,

                insert_theory_const, emit_structured_proof}) timeout =

  external_prover (get_relevant_facts max_new_clauses insert_theory_const)

      (prepare_clauses false) write_tptp_file command (arguments timeout)

      failure_strs

      (if emit_structured_proof then structured_isar_proof

       else metis_lemma_list false) name;

fun tptp_prover (name, p) = (name, generic_tptp_prover (name, p));

(** common provers **)

(* Vampire *)

(*NB: Vampire does not work without explicit timelimit*)

val vampire_failure_strs =

  ["Satisfiability detected", "Refutation not found", "CANNOT PROVE"];

val vampire_max_new_clauses = 60;

val vampire_insert_theory_const = false;

fun vampire_prover_config full : prover_config =

 {command = Path.explode "$VAMPIRE_HOME/vampire",

  arguments = (fn timeout => "--output_syntax tptp --mode casc" ^

    " -t " ^ string_of_int timeout),

  failure_strs = vampire_failure_strs,

  max_new_clauses = vampire_max_new_clauses,

  insert_theory_const = vampire_insert_theory_const,

  emit_structured_proof = full};

val vampire = tptp_prover ("vampire", vampire_prover_config false);

val vampire_isar = tptp_prover ("vampire_isar", vampire_prover_config true);

(* E prover *)

val eprover_failure_strs =

  ["SZS status: Satisfiable", "SZS status Satisfiable",

   "SZS status: ResourceOut", "SZS status ResourceOut",

   "# Cannot determine problem status"];

val eprover_max_new_clauses = 100;

val eprover_insert_theory_const = false;

fun eprover_config full : prover_config =

 {command = Path.explode "$E_HOME/eproof",

  arguments = (fn timeout => "--tstp-in --tstp-out -l5 -xAutoDev -tAutoDev" ^

    " --silent --cpu-limit=" ^ string_of_int timeout),

  failure_strs = eprover_failure_strs,

  max_new_clauses = eprover_max_new_clauses,

  insert_theory_const = eprover_insert_theory_const,

  emit_structured_proof = full};

val eprover = tptp_prover ("e", eprover_config false);

val eprover_isar = tptp_prover ("e_isar", eprover_config true);

(* SPASS *)

val spass_failure_strs =

  ["SPASS beiseite: Completion found.", "SPASS beiseite: Ran out of time.",

   "SPASS beiseite: Maximal number of loops exceeded."];

val spass_max_new_clauses = 40;

val spass_insert_theory_const = true;

fun spass_config insert_theory_const: prover_config =

 {command = Path.explode "$SPASS_HOME/SPASS",

  arguments = (fn timeout => "-Auto -SOS=1 -PGiven=0 -PProblem=0 -Splits=0" ^

    " -FullRed=0 -DocProof -TimeLimit=" ^ string_of_int timeout),

  failure_strs = spass_failure_strs,

  max_new_clauses = spass_max_new_clauses,

  insert_theory_const = insert_theory_const,

  emit_structured_proof = false};

fun generic_dfg_prover

        (name, ({command, arguments, failure_strs, max_new_clauses,

                 insert_theory_const, ...} : prover_config)) timeout =

  external_prover

    (get_relevant_facts max_new_clauses insert_theory_const)

    (prepare_clauses true)

    write_dfg_file

    command

    (arguments timeout)

    failure_strs

    (metis_lemma_list true)

    name;

fun dfg_prover (name, p) = (name, generic_dfg_prover (name, p));

val spass = dfg_prover ("spass", spass_config spass_insert_theory_const);

val spass_no_tc = dfg_prover ("spass_no_tc", spass_config false);

(* remote prover invocation via SystemOnTPTP *)

val systems = Synchronized.var "atp_wrapper_systems" ([]: string list);

fun get_systems () =

  let

    val (answer, rc) = bash_output ("\"$ISABELLE_ATP_MANAGER/SystemOnTPTP\" -w")

  in

    if rc <> 0 then error ("Failed to get available systems at SystemOnTPTP:\n" ^ answer)

    else split_lines answer

  end;

fun refresh_systems_on_tptp () =

  Synchronized.change systems (fn _ => get_systems ());

fun get_system prefix = Synchronized.change_result systems (fn systems =>

  (if null systems then get_systems () else systems)

  |> `(find_first (String.isPrefix prefix)));

fun the_system prefix =

  (case get_system prefix of

    NONE => error ("System " ^ quote prefix ^ " not available at SystemOnTPTP")

  | SOME sys => sys);

val remote_failure_strs = ["Remote-script could not extract proof"];

fun remote_prover_config prover_prefix args max_new insert_tc: prover_config =

 {command = Path.explode "$ISABELLE_ATP_MANAGER/SystemOnTPTP",

  arguments = (fn timeout =>

    args ^ " -t " ^ string_of_int timeout ^ " -s " ^ the_system prover_prefix),

  failure_strs = remote_failure_strs,

  max_new_clauses = max_new,

  insert_theory_const = insert_tc,

  emit_structured_proof = false};

val remote_vampire = tptp_prover ("remote_vampire", remote_prover_config

  "Vampire---9" "" vampire_max_new_clauses vampire_insert_theory_const);

val remote_eprover = tptp_prover ("remote_e", remote_prover_config

  "EP---" "" eprover_max_new_clauses eprover_insert_theory_const);

val remote_spass = tptp_prover ("remote_spass", remote_prover_config

  "SPASS---" "-x" spass_max_new_clauses spass_insert_theory_const);

val provers =

  [spass, vampire, eprover, vampire_isar, eprover_isar, spass_no_tc,

   remote_vampire, remote_spass, remote_eprover]

val prover_setup = fold add_prover provers

val setup =

  destdir_setup

  #> problem_prefix_setup

  #> measure_runtime_setup

  #> prover_setup;

end;