# File hol4rews.ML

    (*  Title:      HOL/Import/hol4rews.ML
        ID:         $Id: hol4rews.ML,v 1.14 2005/09/26 00:27:14 obua Exp $
        Author:     Sebastian Skalberg (TU Muenchen)
    *)

    structure StringPair = TableFun(type key = string * string val ord = prod_ord string_ord string_ord);

    type holthm = (term * term) list * thm

    datatype ImportStatus =
    	 NoImport
           | Generating of string
           | Replaying of string

    structure HOL4DefThyArgs: THEORY_DATA_ARGS =
    struct
    val name = "HOL4/import_status"
    type T = ImportStatus
    val empty = NoImport
    val copy = I
    val extend = I
    fun merge _ (NoImport,NoImport) = NoImport
      | merge _ _ = (warning "Import status set during merge"; NoImport)
    fun print sg import_status =
        Pretty.writeln (Pretty.str (case import_status of NoImport => "No current import" | Generating thyname => ("Generating " ^ thyname) | Replaying thyname => ("Replaying " ^ thyname)))
    end;

    structure HOL4DefThy = TheoryDataFun(HOL4DefThyArgs);

    structure ImportSegmentArgs: THEORY_DATA_ARGS =
    struct
    val name = "HOL4/import_segment"
    type T = string
    val empty = ""
    val copy = I
    val extend = I
    fun merge _ ("",arg) = arg
      | merge _ (arg,"") = arg
      | merge _ (s1,s2) =
        if s1 = s2
        then s1
        else error "Trying to merge two different import segments"
    fun print sg import_segment =
        Pretty.writeln (Pretty.str ("Import segment: " ^ import_segment))
    end;

    structure ImportSegment = TheoryDataFun(ImportSegmentArgs);

    val get_import_segment = ImportSegment.get
    val set_import_segment = ImportSegment.put

    structure HOL4UNamesArgs: THEORY_DATA_ARGS =
    struct
    val name = "HOL4/used_names"
    type T = string list
    val empty = []
    val copy = I
    val extend = I
    fun merge _ ([],[]) = []
      | merge _ _ = error "Used names not empty during merge"
    fun print sg used_names =
        Pretty.writeln (Pretty.str "Printing of HOL4/used_names Not implemented")
    end;

    structure HOL4UNames = TheoryDataFun(HOL4UNamesArgs);

    structure HOL4DumpArgs: THEORY_DATA_ARGS =
    struct
    val name = "HOL4/dump_data"
    type T = string * string * string list
    val empty = ("","",[])
    val copy = I
    val extend = I
    fun merge _ (("","",[]),("","",[])) = ("","",[])
      | merge _ _ = error "Dump data not empty during merge"
    fun print sg dump_data =
        Pretty.writeln (Pretty.str "Printing of HOL4/dump_data Not implemented")
    end;

    structure HOL4Dump = TheoryDataFun(HOL4DumpArgs);

    structure HOL4MovesArgs: THEORY_DATA_ARGS =
    struct
    val name = "HOL4/moves"
    type T = string Symtab.table
    val empty = Symtab.empty
    val copy = I
    val extend = I
    fun merge _ : T * T -> T = Symtab.merge (K true)
    fun print sg tab =
        Pretty.writeln (Pretty.big_list "HOL4 moves:"
    	(Symtab.foldl (fn (xl,(bef,aft)) => (Pretty.str (bef ^ " --> " ^ aft)::xl)) ([],tab)))
    end;

    structure HOL4Moves = TheoryDataFun(HOL4MovesArgs);

    structure HOL4ImportsArgs: THEORY_DATA_ARGS =
    struct
    val name = "HOL4/imports"
    type T = string Symtab.table
    val empty = Symtab.empty
    val copy = I
    val extend = I
    fun merge _ : T * T -> T = Symtab.merge (K true)
    fun print sg tab =
        Pretty.writeln (Pretty.big_list "HOL4 imports:"
    	(Symtab.foldl (fn (xl,(thyname,segname)) => (Pretty.str (thyname ^ " imported from segment " ^ segname)::xl)) ([],tab)))
    end;

    structure HOL4Imports = TheoryDataFun(HOL4ImportsArgs);

    fun get_segment2 thyname thy =
      Symtab.lookup (HOL4Imports.get thy) thyname

    fun set_segment thyname segname thy =
        let
    	val imps = HOL4Imports.get thy
    	val imps' = Symtab.update_new (thyname,segname) imps
        in
    	HOL4Imports.put imps' thy
        end

    structure HOL4CMovesArgs: THEORY_DATA_ARGS =
    struct
    val name = "HOL4/constant_moves"
    type T = string Symtab.table
    val empty = Symtab.empty
    val copy = I
    val extend = I
    fun merge _ : T * T -> T = Symtab.merge (K true)
    fun print sg tab =
        Pretty.writeln (Pretty.big_list "HOL4 constant moves:"
    	(Symtab.foldl (fn (xl,(bef,aft)) => (Pretty.str (bef ^ " --> " ^ aft)::xl)) ([],tab)))
    end;

    structure HOL4CMoves = TheoryDataFun(HOL4CMovesArgs);

    structure HOL4MapsArgs: THEORY_DATA_ARGS =
    struct
    val name = "HOL4/mappings"
    type T = (string option) StringPair.table
    val empty = StringPair.empty
    val copy = I
    val extend = I
    fun merge _ : T * T -> T = StringPair.merge (K true)
    fun print sg tab =
        Pretty.writeln (Pretty.big_list "HOL4 mappings:"
    	(StringPair.foldl (fn (xl,((bthy,bthm),isathm)) => (Pretty.str (bthy ^ "." ^ bthm ^ (case isathm of SOME th => " --> " ^ th | NONE => "IGNORED"))::xl)) ([],tab)))
    end;

    structure HOL4Maps = TheoryDataFun(HOL4MapsArgs);

    structure HOL4ThmsArgs: THEORY_DATA_ARGS =
    struct
    val name = "HOL4/theorems"
    type T = holthm StringPair.table
    val empty = StringPair.empty
    val copy = I
    val extend = I
    fun merge _ : T * T -> T = StringPair.merge (K true)
    fun print sg tab =
        Pretty.writeln (Pretty.big_list "HOL4 mappings:"
    	(StringPair.foldl (fn (xl,((bthy,bthm),(_,thm))) => (Pretty.str (bthy ^ "." ^ bthm ^ ":")::(Display.pretty_thm thm)::xl)) ([],tab)))
    end;

    structure HOL4Thms = TheoryDataFun(HOL4ThmsArgs);

    structure HOL4ConstMapsArgs: THEORY_DATA_ARGS =
    struct
    val name = "HOL4/constmappings"
    type T = (bool * string * typ option) StringPair.table
    val empty = StringPair.empty
    val copy = I
    val extend = I
    fun merge _ : T * T -> T = StringPair.merge (K true)
    fun print sg tab =
        Pretty.writeln (Pretty.big_list "HOL4 constant mappings:"
    	(StringPair.foldl (fn (xl,((bthy,bconst),(internal,isaconst,_))) => (Pretty.str (bthy ^ "." ^ bconst ^ " --> " ^ isaconst ^ (if internal then " (*)" else ""))::xl)) ([],tab)))
    end;

    structure HOL4ConstMaps = TheoryDataFun(HOL4ConstMapsArgs);

    structure HOL4RenameArgs: THEORY_DATA_ARGS =
    struct
    val name = "HOL4/renamings"
    type T = string StringPair.table
    val empty = StringPair.empty
    val copy = I
    val extend = I
    fun merge _ : T * T -> T = StringPair.merge (K true)
    fun print sg tab =
        Pretty.writeln (Pretty.big_list "HOL4 constant renamings:"
    	(StringPair.foldl (fn (xl,((bthy,bconst),newname)) => (Pretty.str (bthy ^ "." ^ bconst ^ " --> " ^ newname)::xl)) ([],tab)))
    end;

    structure HOL4Rename = TheoryDataFun(HOL4RenameArgs);

    structure HOL4DefMapsArgs: THEORY_DATA_ARGS =
    struct
    val name = "HOL4/def_maps"
    type T = string StringPair.table
    val empty = StringPair.empty
    val copy = I
    val extend = I
    fun merge _ : T * T -> T = StringPair.merge (K true)
    fun print sg tab =
        Pretty.writeln (Pretty.big_list "HOL4 constant definitions:"
    	(StringPair.foldl (fn (xl,((bthy,bconst),newname)) => (Pretty.str (bthy ^ "." ^ bconst ^ ": " ^ newname)::xl)) ([],tab)))
    end;

    structure HOL4DefMaps = TheoryDataFun(HOL4DefMapsArgs);

    structure HOL4TypeMapsArgs: THEORY_DATA_ARGS =
    struct
    val name = "HOL4/typemappings"
    type T = (bool * string) StringPair.table
    val empty = StringPair.empty
    val copy = I
    val extend = I
    fun merge _ : T * T -> T = StringPair.merge (K true)
    fun print sg tab =
        Pretty.writeln (Pretty.big_list "HOL4 type mappings:"
    	(StringPair.foldl (fn (xl,((bthy,bconst),(internal,isaconst))) => (Pretty.str (bthy ^ "." ^ bconst ^ " --> " ^ isaconst ^ (if internal then " (*)" else ""))::xl)) ([],tab)))
    end;

    structure HOL4TypeMaps = TheoryDataFun(HOL4TypeMapsArgs);

    structure HOL4PendingArgs: THEORY_DATA_ARGS =
    struct
    val name = "HOL4/pending"
    type T = ((term * term) list * thm) StringPair.table
    val empty = StringPair.empty
    val copy = I
    val extend = I
    fun merge _ : T * T -> T = StringPair.merge (K true)
    fun print sg tab =
        Pretty.writeln (Pretty.big_list "HOL4 pending theorems:"
    	(StringPair.foldl (fn (xl,((bthy,bthm),(_,th))) => (Pretty.chunks [Pretty.str (bthy ^ "." ^ bthm ^ ":"),Display.pretty_thm th]::xl)) ([],tab)))
    end;

    structure HOL4Pending = TheoryDataFun(HOL4PendingArgs);

    structure HOL4RewritesArgs: THEORY_DATA_ARGS =
    struct
    val name = "HOL4/rewrites"
    type T = thm list
    val empty = []
    val copy = I
    val extend = I
    fun merge _ = Library.gen_union Thm.eq_thm
    fun print sg thms =
        Pretty.writeln (Pretty.big_list "HOL4 rewrite rules:"
    				    (map Display.pretty_thm thms))
    end;

    structure HOL4Rewrites = TheoryDataFun(HOL4RewritesArgs);

    val hol4_debug = ref false
    fun message s = if !hol4_debug then writeln s else ()

    fun add_hol4_rewrite (thy,th) =
        let
    	val _ = message "Adding HOL4 rewrite"
    	val th1 = th RS eq_reflection
    	val current_rews = HOL4Rewrites.get thy
    	val new_rews = gen_ins Thm.eq_thm (th1,current_rews)
    	val updated_thy  = HOL4Rewrites.put new_rews thy
        in
    	(updated_thy,th1)
        end;

    fun ignore_hol4 bthy bthm thy =
        let
    	val _ = message ("Ignoring " ^ bthy ^ "." ^ bthm)
    	val curmaps = HOL4Maps.get thy
    	val newmaps = StringPair.update_new ((bthy,bthm),NONE) curmaps
    	val upd_thy = HOL4Maps.put newmaps thy
        in
    	upd_thy
        end

    val opt_get_output_thy = #2 o HOL4Dump.get

    fun get_output_thy thy =
        case #2 (HOL4Dump.get thy) of
    	"" => error "No theory file being output"
          | thyname => thyname

    val get_output_dir = #1 o HOL4Dump.get

    fun add_hol4_move bef aft thy =
        let
    	val curmoves = HOL4Moves.get thy
    	val newmoves = Symtab.update_new (bef, aft) curmoves
        in
    	HOL4Moves.put newmoves thy
        end

    fun get_hol4_move bef thy =
      Symtab.lookup (HOL4Moves.get thy) bef

    fun follow_name thmname thy =
        let
    	val moves = HOL4Moves.get thy
    	fun F thmname =
    	    case Symtab.lookup moves thmname of
    		SOME name => F name
    	      | NONE => thmname
        in
    	F thmname
        end

    fun add_hol4_cmove bef aft thy =
        let
    	val curmoves = HOL4CMoves.get thy
    	val newmoves = Symtab.update_new (bef, aft) curmoves
        in
    	HOL4CMoves.put newmoves thy
        end

    fun get_hol4_cmove bef thy =
      Symtab.lookup (HOL4CMoves.get thy) bef

    fun follow_cname thmname thy =
        let
    	val moves = HOL4CMoves.get thy
    	fun F thmname =
    	    case Symtab.lookup moves thmname of
    		SOME name => F name
    	      | NONE => thmname
        in
    	F thmname
        end

    fun add_hol4_mapping bthy bthm isathm thy =
        let
           (* val _ = writeln ("Before follow_name: "^isathm)  *)
          val isathm = follow_name isathm thy
           (* val _ = writeln ("Adding theorem map: " ^ bthy ^ "." ^ bthm ^ " --> " ^ isathm)*)
    	val curmaps = HOL4Maps.get thy
    	val newmaps = StringPair.update_new ((bthy,bthm),SOME isathm) curmaps
    	val upd_thy = HOL4Maps.put newmaps thy
        in
    	upd_thy
        end;

    fun get_hol4_type_mapping bthy tycon thy =
        let
    	val maps = HOL4TypeMaps.get thy
        in
    	StringPair.lookup maps (bthy,tycon)
        end

    fun get_hol4_mapping bthy bthm thy =
        let
    	val curmaps = HOL4Maps.get thy
        in
    	StringPair.lookup curmaps (bthy,bthm)
        end;

    fun add_hol4_const_mapping bthy bconst internal isaconst thy =
        let
    	val thy = case opt_get_output_thy thy of
    		      "" => thy
    		    | output_thy => if internal
    				    then add_hol4_cmove (Sign.full_name (sign_of thy) bconst) (output_thy ^ "." ^ bthy ^ "." ^ bconst) thy
    				    else thy
    	val _ = message ("Adding cmap " ^ bthy ^ "." ^ bconst ^ " -> " ^ isaconst ^ (if internal then " (*)" else ""))
    	val curmaps = HOL4ConstMaps.get thy
    	val newmaps = StringPair.update_new ((bthy,bconst),(internal,isaconst,NONE)) curmaps
    	val upd_thy = HOL4ConstMaps.put newmaps thy
        in
    	upd_thy
        end;

    fun add_hol4_const_renaming bthy bconst newname thy =
        let
    	val currens = HOL4Rename.get thy
    	val _ = message ("Adding renaming " ^ bthy ^ "." ^ bconst ^ " -> " ^ newname)
    	val newrens = StringPair.update_new ((bthy,bconst),newname) currens
    	val upd_thy = HOL4Rename.put newrens thy
        in
    	upd_thy
        end;

    fun get_hol4_const_renaming bthy bconst thy =
        let
    	val currens = HOL4Rename.get thy
        in
    	StringPair.lookup currens (bthy,bconst)
        end;

    fun get_hol4_const_mapping bthy bconst thy =
        let
    	val bconst = case get_hol4_const_renaming bthy bconst thy of
    			 SOME name => name
    		       | NONE => bconst
    	val maps = HOL4ConstMaps.get thy
        in
    	StringPair.lookup maps (bthy,bconst)
        end

    fun add_hol4_const_wt_mapping bthy bconst internal isaconst typ thy =
        let
    	val thy = case opt_get_output_thy thy of
    		      "" => thy
    		    | output_thy => if internal
    				    then add_hol4_cmove (Sign.full_name (sign_of thy) bconst) (output_thy ^ "." ^ bthy ^ "." ^ bconst) thy
    				    else thy
    	val _ = message ("Adding cmap " ^ bthy ^ "." ^ bconst ^ " -> " ^ isaconst ^ (if internal then " (*)" else ""))
    	val curmaps = HOL4ConstMaps.get thy
    	val newmaps = StringPair.update_new ((bthy,bconst),(internal,isaconst,SOME typ)) curmaps
    	val upd_thy = HOL4ConstMaps.put newmaps thy
        in
    	upd_thy
        end;

    fun add_hol4_type_mapping bthy bconst internal isaconst thy =
        let
    	val curmaps = HOL4TypeMaps.get thy
    	val _ = writeln ("Adding tmap " ^ bthy ^ "." ^ bconst ^ " -> " ^ isaconst ^ (if internal then " (*)" else ""))
    	val newmaps = StringPair.update_new ((bthy,bconst),(internal,isaconst)) curmaps
                   handle x => let val (internal, isaconst') = the (StringPair.lookup curmaps (bthy, bconst)) in
                          warning ("couldn't map type "^bthy^"."^bconst^" to "^isaconst^": already mapped to "^isaconst'); raise x end
            val upd_thy = HOL4TypeMaps.put newmaps thy
        in
    	upd_thy
        end;

    fun add_hol4_pending bthy bthm hth thy =
        let
    	val thmname = Sign.full_name (sign_of thy) bthm
    	val _ = message ("Add pending " ^ bthy ^ "." ^ bthm)
    	val curpend = HOL4Pending.get thy
    	val newpend = StringPair.update_new ((bthy,bthm),hth) curpend
    	val upd_thy = HOL4Pending.put newpend thy
    	val thy' = case opt_get_output_thy upd_thy of
    		       "" => add_hol4_mapping bthy bthm thmname upd_thy
    		     | output_thy =>
    		       let
    			   val new_thmname = output_thy ^ "." ^ bthy ^ "." ^ bthm
    		       in
    			   upd_thy |> add_hol4_move thmname new_thmname
    				   |> add_hol4_mapping bthy bthm new_thmname
    		       end
        in
    	thy'
        end;

    fun get_hol4_theorem thyname thmname thy =
        let
    	val isathms = HOL4Thms.get thy
        in
    	StringPair.lookup isathms (thyname,thmname)
        end

    fun add_hol4_theorem thyname thmname hth thy =
        let
    	val _ = message ("Adding HOL4 theorem " ^ thyname ^ "." ^ thmname)
    	val isathms = HOL4Thms.get thy
    	val isathms' = StringPair.update_new ((thyname,thmname),hth) isathms
    	val thy' = HOL4Thms.put isathms' thy
        in
    	thy'
        end

    fun export_hol4_pending thy =
        let
    	val rews    = HOL4Rewrites.get thy
    	val outthy  = get_output_thy thy
    	fun process (thy,((bthy,bthm),hth as (_,thm))) =
    	    let
    		val sg      = sign_of thy
    		val thm1 = rewrite_rule (map (Thm.transfer sg) rews) (Thm.transfer sg thm)
    		val thm2 = standard thm1
    		val (thy2,_) = PureThy.store_thm((bthm,thm2),[]) thy
    		val thy5 = add_hol4_theorem bthy bthm hth thy2
    	    in
    		thy5
    	    end

    	val pending = HOL4Pending.get thy
    	val thy1    = StringPair.foldl process (thy,pending)
    	val thy2    = HOL4Pending.put (StringPair.empty) thy1
        in
    	thy2
        end;

    fun setup_dump (dir,thyname) thy =
        HOL4Dump.put (dir,thyname,["(* AUTOMATICALLY GENERATED, DO NOT EDIT! *)"]) thy

    fun add_dump str thy =
        let
    	val (dir,thyname,curdump) = HOL4Dump.get thy
        in
    	HOL4Dump.put (dir,thyname,str::curdump) thy
        end

    fun flush_dump thy =
        let
    	val (dir,thyname,dumpdata) = HOL4Dump.get thy
    	val os = TextIO.openOut (OS.Path.joinDirFile {dir=dir,
    						      file=thyname ^ ".thy"})
    	val _  = app (fn s => TextIO.output(os,s ^ "\n\n")) (rev dumpdata)
    	val  _ = TextIO.closeOut os
        in
    	HOL4Dump.put ("","",[]) thy
        end

    fun set_generating_thy thyname thy =
        case HOL4DefThy.get thy of
    	NoImport => HOL4DefThy.put (Generating thyname) thy
          | _ => error "Import already in progess"

    fun set_replaying_thy thyname thy =
        case HOL4DefThy.get thy of
    	NoImport => HOL4DefThy.put (Replaying thyname) thy
          | _ => error "Import already in progess"

    fun clear_import_thy thy =
        case HOL4DefThy.get thy of
    	NoImport => error "No import in progress"
          | _ => HOL4DefThy.put NoImport thy

    fun get_generating_thy thy =
        case HOL4DefThy.get thy of
    	Generating thyname => thyname
          | _ => error "No theory being generated"

    fun get_replaying_thy thy =
        case HOL4DefThy.get thy of
    	Replaying thyname => thyname
          | _ => error "No theory being replayed"

    fun get_import_thy thy =
        case HOL4DefThy.get thy of
    	Replaying thyname => thyname
          | Generating thyname => thyname
          | _ => error "No theory being imported"

    fun should_ignore thyname thy thmname =
        case get_hol4_mapping thyname thmname thy of
    	SOME NONE => true
          | _ => false

    val trans_string =
        let
    	fun quote s = "\"" ^ s ^ "\""
    	fun F [] = []
    	  | F (#"\\" :: cs) = patch #"\\" cs
    	  | F (#"\"" :: cs) = patch #"\"" cs
    	  | F (c     :: cs) = c :: F cs
    	and patch c rest = #"\\" :: c :: F rest
        in
    	quote o String.implode o F o String.explode
        end

    fun dump_import_thy thyname thy =
        let
    	val output_dir = get_output_dir thy
    	val output_thy = get_output_thy thy
    	val input_thy = Context.theory_name thy
    	val import_segment = get_import_segment thy
    	val sg = sign_of thy
    	val os = TextIO.openOut (OS.Path.joinDirFile {dir=output_dir,
    						      file=thyname ^ ".imp"})
    	fun out s = TextIO.output(os,s)
    	val (ignored,mapped) =
    	    StringPair.foldl (fn ((ign,map),((bthy,bthm),v)) =>
    				 if bthy = thyname
    				 then (case v of
    					   NONE => (bthm::ign,map)
    					 | SOME w => (ign,(bthm,w)::map))
    				 else (ign,map))
    				 (([],[]),HOL4Maps.get thy)
    	val constmaps =
    	    StringPair.foldl (fn (map,((bthy,bthm),v)) =>
    				 if bthy = thyname
    				 then (bthm,v)::map
    				 else map)
    				 ([],HOL4ConstMaps.get thy)

    	val constrenames =
    	    StringPair.foldl (fn (map,((bthy,bthm),v)) =>
    				 if bthy = thyname
    				 then (bthm,v)::map
    				 else map)
    				 ([],HOL4Rename.get thy)

    	val typemaps =
    	    StringPair.foldl (fn (map,((bthy,bthm),v)) =>
    				 if bthy = thyname
    				 then (bthm,v)::map
    				 else map)
    				 ([],HOL4TypeMaps.get thy)

    	val defmaps =
    	    StringPair.foldl (fn (map,((bthy,bthm),v)) =>
    				 if bthy = thyname
    				 then (bthm,v)::map
    				 else map)
    				 ([],HOL4DefMaps.get thy)

    	fun new_name internal isa =
    	    if internal
    	    then
    		let
    		    val paths = NameSpace.unpack isa
    		    val i = Library.drop(length paths - 2,paths)
    		in
    		    case i of
    			[seg,con] => output_thy ^ "." ^ seg ^ "." ^ con
    		      | _ => error "hol4rews.dump internal error"
    		end
    	    else
    		isa

    	val _ = out "import\n\n"

    	val _ = out ("import_segment " ^ trans_string import_segment ^ "\n\n")
    	val _ = if null defmaps
    		then ()
    		else out "def_maps"
    	val _ = app (fn (hol,isa) =>
    			out ("\n  " ^ (trans_string hol) ^ " > " ^ (trans_string isa))) defmaps
    	val _ = if null defmaps
    		then ()
    		else out "\n\n"

    	val _ = if null typemaps
    		then ()
    		else out "type_maps"
    	val _ = app (fn (hol,(internal,isa)) =>
    			out ("\n  " ^ (trans_string hol) ^ " > " ^ (trans_string (new_name internal isa)))) typemaps
    	val _ = if null typemaps
    		then ()
    		else out "\n\n"

    	val _ = if null constmaps
    		then ()
    		else out "const_maps"
    	val _ = app (fn (hol,(internal,isa,opt_ty)) =>
    			(out ("\n  " ^ (trans_string hol) ^ " > " ^ (trans_string (follow_cname isa thy)));
    			 case opt_ty of
    			     SOME ty => out (" :: \"" ^ (string_of_ctyp (ctyp_of sg ty)) ^ "\"")
    			   | NONE => ())) constmaps
    	val _ = if null constmaps
    		then ()
    		else out "\n\n"

    	val _ = if null constrenames
    		then ()
    		else out "const_renames"
    	val _ = app (fn (old,new) =>
    			out ("\n  " ^ (trans_string old) ^ " > " ^ (trans_string new))) constrenames
    	val _ = if null constrenames
    		then ()
    		else out "\n\n"

    	fun gen2replay in_thy out_thy s =
    	    let
    		val ss = NameSpace.unpack s
    	    in
    		if (hd ss = in_thy) then
    		    NameSpace.pack (out_thy::(tl ss))
    		else
    		    s
    	    end

    	val _ = if null mapped
    		then ()
    		else out "thm_maps"
    	val _ = app (fn (hol,isa) => out ("\n  " ^ (trans_string hol) ^ " > " ^ (trans_string (gen2replay input_thy output_thy isa)))) mapped
    	val _ = if null mapped
    		then ()
    		else out "\n\n"

    	val _ = if null ignored
    		then ()
    		else out "ignore_thms"
    	val _ = app (fn ign => out ("\n  " ^ (trans_string ign))) ignored
    	val _ = if null ignored
    		then ()
    		else out "\n\n"

    	val _ = out "end\n"
    	val _ = TextIO.closeOut os
        in
    	thy
        end

    fun set_used_names names thy =
        let
    	val unames = HOL4UNames.get thy
        in
    	case unames of
    	    [] => HOL4UNames.put names thy
    	  | _ => error "hol4rews.set_used_names called on initialized data!"
        end

    val clear_used_names = HOL4UNames.put HOL4UNamesArgs.empty

    fun get_defmap thyname const thy =
        let
    	val maps = HOL4DefMaps.get thy
        in
    	StringPair.lookup maps (thyname,const)
        end

    fun add_defmap thyname const defname thy =
        let
    	val _ = message ("Adding defmap " ^ thyname ^ "." ^ const ^ " --> " ^ defname)
    	val maps = HOL4DefMaps.get thy
    	val maps' = StringPair.update_new ((thyname,const),defname) maps
    	val thy' = HOL4DefMaps.put maps' thy
        in
    	thy'
        end

    fun get_defname thyname name thy =
        let
    	val maps = HOL4DefMaps.get thy
    	fun F dname = (dname,add_defmap thyname name dname thy)
        in
    	case StringPair.lookup maps (thyname,name) of
    	    SOME thmname => (thmname,thy)
    	  | NONE =>
    	    let
    		val used = HOL4UNames.get thy
    		val defname = def_name name
    		val pdefname = name ^ "_primdef"
    	    in
    		if not (defname mem used)
    		then F defname                 (* name_def *)
    		else if not (pdefname mem used)
    		then F pdefname                (* name_primdef *)
    		else F (variant used pdefname) (* last resort *)
    	    end
        end

    local
        fun handle_meta [x as Appl[Appl[Constant "_constrain", Constant "==", _],_,_]] = x
          | handle_meta [x as Appl[Appl[Constant "_constrain", Constant "all", _],_]] = x
          | handle_meta [x as Appl[Appl[Constant "_constrain", Constant "==>", _],_,_]] = x
          | handle_meta [x] = Appl[Constant "Trueprop",x]
          | handle_meta _ = error "hol4rews error: Trueprop not applied to single argument"
    in
    val smarter_trueprop_parsing = [("Trueprop",handle_meta)]
    end

    local
        fun initial_maps thy =
    	thy |> add_hol4_type_mapping "min" "bool" false "bool"
    	    |> add_hol4_type_mapping "min" "fun" false "fun"
    	    |> add_hol4_type_mapping "min" "ind" false "Nat.ind"
    	    |> add_hol4_const_mapping "min" "=" false "op ="
    	    |> add_hol4_const_mapping "min" "==>" false "op -->"
    	    |> add_hol4_const_mapping "min" "@" false "Hilbert_Choice.Eps"
    in
    val hol4_setup =
        [HOL4Rewrites.init,
         HOL4Maps.init,
         HOL4UNames.init,
         HOL4DefMaps.init,
         HOL4Moves.init,
         HOL4CMoves.init,
         HOL4ConstMaps.init,
         HOL4Rename.init,
         HOL4TypeMaps.init,
         HOL4Pending.init,
         HOL4Thms.init,
         HOL4Dump.init,
         HOL4DefThy.init,
         HOL4Imports.init,
         ImportSegment.init,
         initial_maps,
         Attrib.add_attributes [("hol4rew",
    			     (Attrib.no_args add_hol4_rewrite,
    			      Attrib.no_args Attrib.undef_local_attribute),
    			     "HOL4 rewrite rule")]]
    end