src/HOL/Tools/res_atp.ML
author paulson
Mon, 10 Oct 2005 15:35:29 +0200
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small tidy-up of utility functions
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(*  Author: Jia Meng, Cambridge University Computer Laboratory
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    ID: $Id$
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    Copyright 2004 University of Cambridge
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ATPs with TPTP format input.
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*)
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signature RES_ATP =
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sig
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  val prover: string ref
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  val custom_spass: string list ref
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  val destdir: string ref
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  val hook_count: int ref
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  val problem_name: string ref
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  val time_limit: int ref
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end;
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structure ResAtp: RES_ATP =
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struct
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val call_atp = ref false;
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val hook_count = ref 0;
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val time_limit = ref 60;
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val prover = ref "E";   (* use E as the default prover *)
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val custom_spass =   (*specialized options for SPASS*)
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      ref ["-Auto=0","-FullRed=0","-IORe","-IOFc","-RTaut","-RFSub","-RBSub"];
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val destdir = ref "";   (*Empty means write files to /tmp*)
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val problem_name = ref "prob";
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(*Return the path to a "helper" like SPASS or tptp2X, first checking that
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  it exists.  FIXME: modify to use Path primitives and move to some central place.*)  
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fun helper_path evar base =
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  case getenv evar of
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      "" => error  ("Isabelle environment variable " ^ evar ^ " not defined")
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    | home => 
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        let val path = home ^ "/" ^ base
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        in  if File.exists (File.unpack_platform_path path) then path 
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	    else error ("Could not find the file " ^ path)
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	end;  
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fun probfile_nosuffix _ = 
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  if !destdir = "" then File.platform_path (File.tmp_path (Path.basic (!problem_name)))
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  else if File.exists (File.unpack_platform_path (!destdir))
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  then !destdir ^ "/" ^ !problem_name
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  else error ("No such directory: " ^ !destdir);
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fun prob_pathname n = probfile_nosuffix n ^ "_" ^ Int.toString n;
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(**** For running in Isar ****)
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(* same function as that in res_axioms.ML *)
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fun repeat_RS thm1 thm2 =
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    let val thm1' =  thm1 RS thm2 handle THM _ => thm1
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    in
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        if eq_thm(thm1,thm1') then thm1' else (repeat_RS thm1' thm2)
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    end;
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(* a special version of repeat_RS *)
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fun repeat_someI_ex th = repeat_RS th someI_ex;
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fun writeln_strs _   []      = ()
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  | writeln_strs out (s::ss) = (TextIO.output (out, s); TextIO.output (out, "\n"); writeln_strs out ss);
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(* write out a subgoal as tptp clauses to the file "xxxx_N"*)
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fun tptp_inputs_tfrees thms pf n (axclauses,classrel_clauses,arity_clauses) =
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  let
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    val clss = map (ResClause.make_conjecture_clause_thm) thms
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    val (tptp_clss,tfree_litss) = ListPair.unzip (map ResClause.clause2tptp clss)
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    val tfree_clss = map ResClause.tfree_clause (foldl (op union_string) [] tfree_litss)
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    val classrel_cls = map ResClause.tptp_classrelClause classrel_clauses
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    val arity_cls = map ResClause.tptp_arity_clause arity_clauses
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    val out = TextIO.openOut(pf n)
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  in
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    writeln_strs out (List.concat (map ResClause.tptp_clause axclauses));
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    writeln_strs out (tfree_clss @ tptp_clss @ classrel_cls @ arity_cls);
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    TextIO.closeOut out
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  end;
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(* write out a subgoal in DFG format to the file "xxxx_N"*)
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fun dfg_inputs_tfrees thms pf n (axclauses,classrel_clauses,arity_clauses) = 
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    let val clss = map (ResClause.make_conjecture_clause_thm) thms
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        (*FIXME: classrel_clauses and arity_clauses*)
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        val probN = ResClause.clauses2dfg clss (!problem_name ^ "_" ^ Int.toString n)
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                        axclauses [] [] []    
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	val out = TextIO.openOut(pf n)
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    in
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	writeln_strs out [probN]; TextIO.closeOut out
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    end;
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(*********************************************************************)
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(* call prover with settings and problem file for the current subgoal *)
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(*********************************************************************)
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(* now passing in list of skolemized thms and list of sgterms to go with them *)
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fun watcher_call_provers sign sg_terms (childin, childout, pid) =
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  let
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    fun make_atp_list [] n = []
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      | make_atp_list (sg_term::xs) n =
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          let
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            val probfile = prob_pathname n
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            val time = Int.toString (!time_limit)
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          in
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            debug ("problem file in watcher_call_provers is " ^ probfile);
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            (*Avoid command arguments containing spaces: Poly/ML and SML/NJ
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              versions of Unix.execute treat them differently!*)
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            (*options are separated by Watcher.setting_sep, currently #"%"*)
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            if !prover = "spass"
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            then
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              let val optionline = 
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		      if !AtpCommunication.reconstruct 
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		          (*Proof reconstruction works for only a limited set of 
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		            inference rules*)
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                      then space_implode "%" (!custom_spass) ^
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                           "%-DocProof%-TimeLimit=" ^ time
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                      else "-DocProof%-SOS%-FullRed=0%-TimeLimit=" ^ time (*Auto mode*)
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                  val _ = debug ("SPASS option string is " ^ optionline)
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                  val _ = helper_path "SPASS_HOME" "SPASS"
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                    (*We've checked that SPASS is there for ATP/spassshell to run.*)
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              in 
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                  ([("spass", 
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                     getenv "ISABELLE_HOME" ^ "/src/HOL/Tools/ATP/spassshell",
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                     optionline, probfile)] @ 
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                  (make_atp_list xs (n+1)))
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              end
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            else if !prover = "vampire"
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	    then 
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              let val vampire = helper_path "VAMPIRE_HOME" "vampire"
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              in
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                ([("vampire", vampire, "-m 100000%-t " ^ time, probfile)] @
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                 (make_atp_list xs (n+1)))       (*BEWARE! spaces in options!*)
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              end
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      	     else if !prover = "E"
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      	     then
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	       let val Eprover = helper_path "E_HOME" "eproof"
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	       in
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		  ([("E", Eprover, 
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		     "--tptp-in%-l5%-xAuto%-tAuto%--cpu-limit=" ^ time,
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		     probfile)] @
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		   (make_atp_list xs (n+1)))
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	       end
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	     else error ("Invalid prover name: " ^ !prover)
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          end
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    val atp_list = make_atp_list sg_terms 1
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  in
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    Watcher.callResProvers(childout,atp_list);
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    debug "Sent commands to watcher!"
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  end
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(*We write out problem files for each subgoal. Argument pf generates filenames,
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  and allows the suppression of the suffix "_1" in problem-generation mode.*)
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fun write_problem_files pf (ctxt,th)  =
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  let val prems = Thm.prems_of th
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      val (clause_arr, axclauses) = ResClasimp.get_clasimp_lemmas ctxt (hd prems) 
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              (*FIXME: hack!! need to consider relevance for all prems*)
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      val _ = debug ("claset and simprules total clauses = " ^ 
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                     Int.toString (Array.length clause_arr))
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      val thy = ProofContext.theory_of ctxt
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      val classrel_clauses = ResTypesSorts.classrel_clauses_thy thy
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      val _ = debug ("classrel clauses = " ^ Int.toString (length classrel_clauses))
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      val arity_clauses = ResTypesSorts.arity_clause_thy thy
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      val _ = debug ("arity clauses = " ^ Int.toString (length arity_clauses))
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      val write = if !prover = "spass" then dfg_inputs_tfrees else tptp_inputs_tfrees
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      fun writenext n =
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	if n=0 then []
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	 else
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	   (SELECT_GOAL
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	    (EVERY1 [rtac ccontr, ObjectLogic.atomize_tac, skolemize_tac, 
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	      METAHYPS(fn negs => 
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		(write (make_clauses negs) pf n 
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		       (axclauses,classrel_clauses,arity_clauses);
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		 all_tac))]) n th;
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	    pf n :: writenext (n-1))
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      in (writenext (length prems), clause_arr) end;
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val last_watcher_pid = ref (NONE : (TextIO.instream * TextIO.outstream * 
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                                    Posix.Process.pid * string list) option);
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fun kill_last_watcher () =
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    (case !last_watcher_pid of 
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         NONE => ()
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       | SOME (_, childout, pid, files) => 
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	  (debug ("Killing old watcher, pid = " ^ string_of_pid pid);
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	   Watcher.killWatcher pid;  
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	   ignore (map (try OS.FileSys.remove) files)))
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     handle OS.SysErr _ => debug "Attempt to kill watcher failed";
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(*writes out the current clasimpset to a tptp file;
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  turns off xsymbol at start of function, restoring it at end    *)
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val isar_atp = setmp print_mode [] 
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 (fn (ctxt, th) =>
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  if Thm.no_prems th then ()
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  else
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    let
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      val _ = kill_last_watcher()
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      val (files,clause_arr) = write_problem_files prob_pathname (ctxt,th)
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      val (childin, childout, pid) = Watcher.createWatcher (th, clause_arr)
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    in
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      last_watcher_pid := SOME (childin, childout, pid, files);
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      debug ("problem files: " ^ space_implode ", " files); 
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      debug ("pid: " ^ string_of_pid pid);
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      watcher_call_provers (sign_of_thm th) (Thm.prems_of th) (childin, childout, pid)
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    end);
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val isar_atp_writeonly = setmp print_mode [] 
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      (fn (ctxt,th) =>
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       if Thm.no_prems th then ()
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       else 
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         let val pf = if Thm.nprems_of th = 1 then probfile_nosuffix 
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         	      else prob_pathname
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         in ignore (write_problem_files pf (ctxt,th)) end);
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(** the Isar toplevel hook **)
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val invoke_atp = Toplevel.unknown_proof o Toplevel.keep (fn state =>
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  let
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    val proof = Toplevel.proof_of state
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    val (ctxt, (_, goal)) = Proof.get_goal proof
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        handle Proof.STATE _ => error "No goal present";
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    val thy = ProofContext.theory_of ctxt;
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  in
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    debug ("subgoals in isar_atp:\n" ^ 
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           Pretty.string_of (ProofContext.pretty_term ctxt
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             (Logic.mk_conjunction_list (Thm.prems_of goal))));
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    debug ("number of subgoals in isar_atp: " ^ Int.toString (Thm.nprems_of goal));
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    debug ("current theory: " ^ Context.theory_name thy);
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    hook_count := !hook_count +1;
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    debug ("in hook for time: " ^ Int.toString (!hook_count));
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    ResClause.init thy;
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    if !destdir = "" andalso !time_limit > 0 then isar_atp (ctxt, goal)
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    else isar_atp_writeonly (ctxt, goal)
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  end);
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val call_atpP =
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  OuterSyntax.command 
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    "ProofGeneral.call_atp" 
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    "call automatic theorem provers" 
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    OuterKeyword.diag
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    (Scan.succeed (Toplevel.no_timing o invoke_atp));
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val _ = OuterSyntax.add_parsers [call_atpP];
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end;