Removed the references for counting combinators. Instead they are counted in actual clauses.
(* ID: $Id$
Author: Jia Meng, NICTA
FOL clauses translated from HOL formulae. Combinators are used to represent lambda terms.
*)
structure ResHolClause =
struct
(* theorems for combinators and function extensionality *)
val ext = thm "HOL.ext";
val comb_I = thm "ATP_Linkup.COMBI_def";
val comb_K = thm "ATP_Linkup.COMBK_def";
val comb_B = thm "ATP_Linkup.COMBB_def";
val comb_C = thm "ATP_Linkup.COMBC_def";
val comb_S = thm "ATP_Linkup.COMBS_def";
val comb_B' = thm "ATP_Linkup.COMBB'_def";
val comb_C' = thm "ATP_Linkup.COMBC'_def";
val comb_S' = thm "ATP_Linkup.COMBS'_def";
val fequal_imp_equal = thm "ATP_Linkup.fequal_imp_equal";
val equal_imp_fequal = thm "ATP_Linkup.equal_imp_fequal";
(*A flag to set if we use the Turner optimizations. Currently FALSE, as the 5 standard
combinators appear to work best.*)
val use_Turner = ref false;
val const_typargs = ref (Library.K [] : (string*typ -> typ list));
fun init thy = (const_typargs := Sign.const_typargs thy);
(**********************************************************************)
(* convert a Term.term with lambdas into a Term.term with combinators *)
(**********************************************************************)
fun is_free (Bound(a)) n = (a = n)
| is_free (Abs(x,_,b)) n = (is_free b (n+1))
| is_free (P $ Q) n = ((is_free P n) orelse (is_free Q n))
| is_free _ _ = false;
(*******************************************)
fun mk_compact_comb (tm as (Const("ATP_Linkup.COMBB",_)$p) $ (Const("ATP_Linkup.COMBB",_)$q$r)) bnds =
let val tp_p = Term.type_of1(bnds,p)
val tp_q = Term.type_of1(bnds,q)
val tp_r = Term.type_of1(bnds,r)
val typ = Term.type_of1(bnds,tm)
val typ_B' = [tp_p,tp_q,tp_r] ---> typ
in
Const("ATP_Linkup.COMBB'",typ_B') $ p $ q $ r
end
| mk_compact_comb (tm as (Const("ATP_Linkup.COMBC",_) $ (Const("ATP_Linkup.COMBB",_)$p$q) $ r)) bnds =
let val tp_p = Term.type_of1(bnds,p)
val tp_q = Term.type_of1(bnds,q)
val tp_r = Term.type_of1(bnds,r)
val typ = Term.type_of1(bnds,tm)
val typ_C' = [tp_p,tp_q,tp_r] ---> typ
in
Const("ATP_Linkup.COMBC'",typ_C') $ p $ q $ r
end
| mk_compact_comb (tm as (Const("ATP_Linkup.COMBS",_) $ (Const("ATP_Linkup.COMBB",_)$p$q) $ r)) bnds =
let val tp_p = Term.type_of1(bnds,p)
val tp_q = Term.type_of1(bnds,q)
val tp_r = Term.type_of1(bnds,r)
val typ = Term.type_of1(bnds,tm)
val typ_S' = [tp_p,tp_q,tp_r] ---> typ
in
Const("ATP_Linkup.COMBS'",typ_S') $ p $ q $ r
end
| mk_compact_comb tm _ = tm;
fun compact_comb t bnds =
if !use_Turner then mk_compact_comb t bnds else t;
fun lam2comb (Abs(x,tp,Bound 0)) _ = Const("ATP_Linkup.COMBI",tp-->tp)
| lam2comb (Abs(x,tp,Bound n)) bnds =
let val tb = List.nth(bnds,n-1)
in
Const("ATP_Linkup.COMBK", [tb,tp] ---> tb) $ Bound (n-1)
end
| lam2comb (Abs(x,t1,Const(c,t2))) _ = Const("ATP_Linkup.COMBK",[t2,t1] ---> t2) $ Const(c,t2)
| lam2comb (Abs(x,t1,Free(v,t2))) _ = Const("ATP_Linkup.COMBK",[t2,t1] ---> t2) $ Free(v,t2)
| lam2comb (Abs(x,t1,Var(ind,t2))) _ = Const("ATP_Linkup.COMBK", [t2,t1] ---> t2) $ Var(ind,t2)
| lam2comb (t as (Abs(x,t1,P$(Bound 0)))) bnds =
if is_free P 0 then
let val tI = [t1] ---> t1
val P' = lam2comb (Abs(x,t1,P)) bnds
val tp' = Term.type_of1(bnds,P')
val tr = Term.type_of1(t1::bnds,P)
val tS = [tp',tI] ---> tr
in
compact_comb (Const("ATP_Linkup.COMBS",tS) $ P' $
Const("ATP_Linkup.COMBI",tI)) bnds
end
else incr_boundvars ~1 P
| lam2comb (t as (Abs(x,t1,P$Q))) bnds =
let val nfreeP = not(is_free P 0)
and nfreeQ = not(is_free Q 0)
val tpq = Term.type_of1(t1::bnds, P$Q)
in
if nfreeP andalso nfreeQ
then
let val tK = [tpq,t1] ---> tpq
val PQ' = incr_boundvars ~1 (P $ Q)
in
Const("ATP_Linkup.COMBK",tK) $ PQ'
end
else if nfreeP then
let val Q' = lam2comb (Abs(x,t1,Q)) bnds
val P' = incr_boundvars ~1 P
val tp = Term.type_of1(bnds,P')
val tq' = Term.type_of1(bnds, Q')
val tB = [tp,tq',t1] ---> tpq
in
compact_comb (Const("ATP_Linkup.COMBB",tB) $ P' $ Q') bnds
end
else if nfreeQ then
let val P' = lam2comb (Abs(x,t1,P)) bnds
val Q' = incr_boundvars ~1 Q
val tq = Term.type_of1(bnds,Q')
val tp' = Term.type_of1(bnds, P')
val tC = [tp',tq,t1] ---> tpq
in
compact_comb (Const("ATP_Linkup.COMBC",tC) $ P' $ Q') bnds
end
else
let val P' = lam2comb (Abs(x,t1,P)) bnds
val Q' = lam2comb (Abs(x,t1,Q)) bnds
val tp' = Term.type_of1(bnds,P')
val tq' = Term.type_of1(bnds,Q')
val tS = [tp',tq',t1] ---> tpq
in
compact_comb (Const("ATP_Linkup.COMBS",tS) $ P' $ Q') bnds
end
end
| lam2comb (t as (Abs(x,t1,_))) _ = raise ResClause.CLAUSE("HOL CLAUSE",t);
(*********************)
fun to_comb (Abs(x,tp,b)) bnds =
lam2comb (Abs(x, tp, to_comb b (tp::bnds))) bnds
| to_comb (P $ Q) bnds = (to_comb P bnds) $ (to_comb Q bnds)
| to_comb t _ = t;
(* print a term containing combinators, used for debugging *)
exception TERM_COMB of term;
fun string_of_term (Const(c,t)) = c
| string_of_term (Free(v,t)) = v
| string_of_term (Var((x,n),t)) = x ^ "_" ^ (string_of_int n)
| string_of_term (P $ Q) =
"(" ^ string_of_term P ^ " " ^ string_of_term Q ^ ")"
| string_of_term t = raise TERM_COMB (t);
(******************************************************)
(* data types for typed combinator expressions *)
(******************************************************)
datatype type_level = T_FULL | T_PARTIAL | T_CONST | T_NONE;
val typ_level = ref T_CONST;
fun full_types () = (typ_level:=T_FULL);
fun partial_types () = (typ_level:=T_PARTIAL);
fun const_types_only () = (typ_level:=T_CONST);
fun no_types () = (typ_level:=T_NONE);
fun find_typ_level () = !typ_level;
type axiom_name = string;
type polarity = bool;
type clause_id = int;
datatype combterm = CombConst of string * ResClause.fol_type * ResClause.fol_type list
| CombFree of string * ResClause.fol_type
| CombVar of string * ResClause.fol_type
| CombApp of combterm * combterm * ResClause.fol_type
datatype literal = Literal of polarity * combterm;
datatype clause =
Clause of {clause_id: clause_id,
axiom_name: axiom_name,
th: thm,
kind: ResClause.kind,
literals: literal list,
ctypes_sorts: (ResClause.typ_var * Term.sort) list,
ctvar_type_literals: ResClause.type_literal list,
ctfree_type_literals: ResClause.type_literal list};
(*********************************************************************)
(* convert a clause with type Term.term to a clause with type clause *)
(*********************************************************************)
fun isFalse (Literal(pol, CombConst(c,_,_))) =
(pol andalso c = "c_False") orelse
(not pol andalso c = "c_True")
| isFalse _ = false;
fun isTrue (Literal (pol, CombConst(c,_,_))) =
(pol andalso c = "c_True") orelse
(not pol andalso c = "c_False")
| isTrue _ = false;
fun isTaut (Clause {literals,...}) = exists isTrue literals;
fun type_of (Type (a, Ts)) =
let val (folTypes,ts) = types_of Ts
val t = ResClause.make_fixed_type_const a
in
(ResClause.mk_fol_type("Comp",t,folTypes), ts)
end
| type_of (tp as (TFree(a,s))) =
let val t = ResClause.make_fixed_type_var a
in
(ResClause.mk_fol_type("Fixed",t,[]), [ResClause.mk_typ_var_sort tp])
end
| type_of (tp as (TVar(v,s))) =
let val t = ResClause.make_schematic_type_var v
in
(ResClause.mk_fol_type("Var",t,[]), [ResClause.mk_typ_var_sort tp])
end
and types_of Ts =
let val foltyps_ts = map type_of Ts
val (folTyps,ts) = ListPair.unzip foltyps_ts
in
(folTyps, ResClause.union_all ts)
end;
(* same as above, but no gathering of sort information *)
fun simp_type_of (Type (a, Ts)) =
let val typs = map simp_type_of Ts
val t = ResClause.make_fixed_type_const a
in
ResClause.mk_fol_type("Comp",t,typs)
end
| simp_type_of (TFree (a,s)) = ResClause.mk_fol_type("Fixed",ResClause.make_fixed_type_var a,[])
| simp_type_of (TVar (v,s)) = ResClause.mk_fol_type("Var",ResClause.make_schematic_type_var v,[]);
fun const_type_of (c,t) =
let val (tp,ts) = type_of t
val tvars = !const_typargs(c,t)
in
(tp, ts, map simp_type_of tvars)
end;
(* convert a Term.term (with combinators) into a combterm, also accummulate sort info *)
fun combterm_of (Const(c,t)) =
let val (tp,ts,tvar_list) = const_type_of (c,t)
val c' = CombConst(ResClause.make_fixed_const c,tp,tvar_list)
in
(c',ts)
end
| combterm_of (Free(v,t)) =
let val (tp,ts) = type_of t
val v' = if ResClause.isMeta v then CombVar(ResClause.make_schematic_var(v,0),tp)
else CombFree(ResClause.make_fixed_var v,tp)
in
(v',ts)
end
| combterm_of (Var(v,t)) =
let val (tp,ts) = type_of t
val v' = CombVar(ResClause.make_schematic_var v,tp)
in
(v',ts)
end
| combterm_of (t as (P $ Q)) =
let val (P',tsP) = combterm_of P
val (Q',tsQ) = combterm_of Q
val tp = Term.type_of t
val t' = CombApp(P',Q', simp_type_of tp)
in
(t',tsP union tsQ)
end;
fun predicate_of ((Const("Not",_) $ P), polarity) = predicate_of (P, not polarity)
| predicate_of (t,polarity) = (combterm_of t, polarity);
fun literals_of_term1 args (Const("Trueprop",_) $ P) = literals_of_term1 args P
| literals_of_term1 args (Const("op |",_) $ P $ Q) =
literals_of_term1 (literals_of_term1 args P) Q
| literals_of_term1 (lits,ts) P =
let val ((pred,ts'),pol) = predicate_of (P,true)
in
(Literal(pol,pred)::lits, ts union ts')
end;
fun literals_of_term P = literals_of_term1 ([],[]) P;
(* making axiom and conjecture clauses *)
fun make_clause(clause_id,axiom_name,kind,th) =
let val (lits,ctypes_sorts) = literals_of_term (to_comb (prop_of th) [])
val (ctvar_lits,ctfree_lits) = ResClause.add_typs_aux ctypes_sorts
in
if forall isFalse lits
then error "Problem too trivial for resolution (empty clause)"
else
Clause {clause_id = clause_id, axiom_name = axiom_name, th = th, kind = kind,
literals = lits, ctypes_sorts = ctypes_sorts,
ctvar_type_literals = ctvar_lits,
ctfree_type_literals = ctfree_lits}
end;
fun add_axiom_clause ((th,(name,id)), pairs) =
let val cls = make_clause(id, name, ResClause.Axiom, th)
in
if isTaut cls then pairs else (name,cls)::pairs
end;
val make_axiom_clauses = foldl add_axiom_clause [];
fun make_conjecture_clauses_aux _ [] = []
| make_conjecture_clauses_aux n (th::ths) =
make_clause(n,"conjecture", ResClause.Conjecture, th) ::
make_conjecture_clauses_aux (n+1) ths;
val make_conjecture_clauses = make_conjecture_clauses_aux 0;
(**********************************************************************)
(* convert clause into ATP specific formats: *)
(* TPTP used by Vampire and E *)
(* DFG used by SPASS *)
(**********************************************************************)
val type_wrapper = "typeinfo";
fun wrap_type (c,tp) = case !typ_level of
T_FULL => type_wrapper ^ ResClause.paren_pack [c, ResClause.string_of_fol_type tp]
| _ => c;
val bool_tp = ResClause.make_fixed_type_const "bool";
val app_str = "hAPP";
val bool_str = "hBOOL";
fun type_of_combterm (CombConst(c,tp,_)) = tp
| type_of_combterm (CombFree(v,tp)) = tp
| type_of_combterm (CombVar(v,tp)) = tp
| type_of_combterm (CombApp(t1,t2,tp)) = tp;
fun string_of_combterm1 (CombConst(c,tp,_)) =
let val c' = if c = "equal" then "c_fequal" else c
in wrap_type (c',tp) end
| string_of_combterm1 (CombFree(v,tp)) = wrap_type (v,tp)
| string_of_combterm1 (CombVar(v,tp)) = wrap_type (v,tp)
| string_of_combterm1 (CombApp(t1,t2,tp)) =
let val s1 = string_of_combterm1 t1
val s2 = string_of_combterm1 t2
in
case !typ_level of
T_FULL => type_wrapper ^
ResClause.paren_pack
[app_str ^ ResClause.paren_pack [s1,s2],
ResClause.string_of_fol_type tp]
| T_PARTIAL => app_str ^ ResClause.paren_pack
[s1,s2, ResClause.string_of_fol_type (type_of_combterm t1)]
| T_NONE => app_str ^ ResClause.paren_pack [s1,s2]
| T_CONST => raise ERROR "string_of_combterm1"
end;
fun string_of_combterm2 (CombConst(c,tp,tvars)) =
let val tvars' = map ResClause.string_of_fol_type tvars
val c' = if c = "equal" then "c_fequal" else c
in
c' ^ ResClause.paren_pack tvars'
end
| string_of_combterm2 (CombFree(v,tp)) = v
| string_of_combterm2 (CombVar(v,tp)) = v
| string_of_combterm2 (CombApp(t1,t2,_)) =
app_str ^ ResClause.paren_pack [string_of_combterm2 t1, string_of_combterm2 t2];
fun string_of_combterm t =
case !typ_level of T_CONST => string_of_combterm2 t
| _ => string_of_combterm1 t;
fun string_of_predicate (CombApp(CombApp(CombConst("equal",_,_),t1,_),t2,_)) =
("equal" ^ ResClause.paren_pack [string_of_combterm t1, string_of_combterm t2])
| string_of_predicate t =
bool_str ^ ResClause.paren_pack [string_of_combterm t]
fun string_of_clausename (cls_id,ax_name) =
ResClause.clause_prefix ^ ResClause.ascii_of ax_name ^ "_" ^ Int.toString cls_id;
fun string_of_type_clsname (cls_id,ax_name,idx) =
string_of_clausename (cls_id,ax_name) ^ "_tcs" ^ (Int.toString idx);
(*** tptp format ***)
fun tptp_of_equality pol (t1,t2) =
let val eqop = if pol then " = " else " != "
in string_of_combterm t1 ^ eqop ^ string_of_combterm t2 end;
fun tptp_literal (Literal(pol, CombApp(CombApp(CombConst("equal",_,_),t1,_),t2,_))) =
tptp_of_equality pol (t1,t2)
| tptp_literal (Literal(pol,pred)) =
ResClause.tptp_sign pol (string_of_predicate pred);
fun tptp_type_lits (Clause cls) =
let val lits = map tptp_literal (#literals cls)
val ctvar_lits_strs =
case !typ_level of T_NONE => []
| _ => map ResClause.tptp_of_typeLit (#ctvar_type_literals cls)
val ctfree_lits =
case !typ_level of T_NONE => []
| _ => map ResClause.tptp_of_typeLit (#ctfree_type_literals cls)
in
(ctvar_lits_strs @ lits, ctfree_lits)
end;
fun clause2tptp (cls as Clause{axiom_name,clause_id,kind,ctypes_sorts,...}) =
let val (lits,ctfree_lits) = tptp_type_lits cls
val cls_str = ResClause.gen_tptp_cls(clause_id,axiom_name,kind,lits)
in
(cls_str,ctfree_lits)
end;
(*** dfg format ***)
fun dfg_literal (Literal(pol,pred)) = ResClause.dfg_sign pol (string_of_predicate pred);
fun dfg_clause_aux (Clause{literals, ctypes_sorts, ...}) =
let val lits = map dfg_literal literals
val (tvar_lits,tfree_lits) = ResClause.add_typs_aux ctypes_sorts
val tvar_lits_strs =
case !typ_level of T_NONE => []
| _ => map ResClause.dfg_of_typeLit tvar_lits
val tfree_lits =
case !typ_level of T_NONE => []
| _ => map ResClause.dfg_of_typeLit tfree_lits
in
(tvar_lits_strs @ lits, tfree_lits)
end;
fun get_uvars (CombConst(_,_,_)) vars = vars
| get_uvars (CombFree(_,_)) vars = vars
| get_uvars (CombVar(v,tp)) vars = (v::vars)
| get_uvars (CombApp(P,Q,tp)) vars = get_uvars P (get_uvars Q vars);
fun get_uvars_l (Literal(_,c)) = get_uvars c [];
fun dfg_vars (Clause {literals,...}) = ResClause.union_all (map get_uvars_l literals);
fun clause2dfg (cls as Clause{axiom_name,clause_id,kind,ctypes_sorts,...}) =
let val (lits,tfree_lits) = dfg_clause_aux cls
val vars = dfg_vars cls
val tvars = ResClause.get_tvar_strs ctypes_sorts
val knd = ResClause.name_of_kind kind
val lits_str = commas lits
val cls_str = ResClause.gen_dfg_cls(clause_id, axiom_name, knd, lits_str, tvars@vars)
in (cls_str, tfree_lits) end;
fun init_funcs_tab funcs =
let val funcs1 = case !typ_level of T_PARTIAL => Symtab.update ("hAPP",3) funcs
| _ => Symtab.update ("hAPP",2) funcs
in
Symtab.update ("typeinfo",2) funcs1
end;
fun add_funcs (CombConst(c,_,tvars),funcs) =
if c = "equal" then foldl ResClause.add_foltype_funcs funcs tvars
else
(case !typ_level of
T_CONST => foldl ResClause.add_foltype_funcs (Symtab.update(c,length tvars) funcs) tvars
| _ => foldl ResClause.add_foltype_funcs (Symtab.update(c,0) funcs) tvars)
| add_funcs (CombFree(v,ctp),funcs) = ResClause.add_foltype_funcs (ctp,Symtab.update (v,0) funcs)
| add_funcs (CombVar(_,ctp),funcs) = ResClause.add_foltype_funcs (ctp,funcs)
| add_funcs (CombApp(P,Q,_),funcs) = add_funcs(P,add_funcs (Q,funcs));
fun add_literal_funcs (Literal(_,c), funcs) = add_funcs (c,funcs);
fun add_clause_funcs (Clause {literals, ...}, funcs) =
foldl add_literal_funcs funcs literals
handle Symtab.DUP a => raise ERROR ("function " ^ a ^ " has multiple arities")
fun funcs_of_clauses clauses arity_clauses =
Symtab.dest (foldl ResClause.add_arityClause_funcs
(foldl add_clause_funcs (init_funcs_tab Symtab.empty) clauses)
arity_clauses)
fun add_clause_preds (Clause {ctypes_sorts, ...}, preds) =
foldl ResClause.add_type_sort_preds preds ctypes_sorts
handle Symtab.DUP a => raise ERROR ("predicate " ^ a ^ " has multiple arities")
(*Higher-order clauses have only the predicates hBOOL and type classes.*)
fun preds_of_clauses clauses clsrel_clauses arity_clauses =
Symtab.dest
(foldl ResClause.add_classrelClause_preds
(foldl ResClause.add_arityClause_preds
(Symtab.update ("hBOOL",1)
(foldl add_clause_preds Symtab.empty clauses))
arity_clauses)
clsrel_clauses)
(**********************************************************************)
(* write clauses to files *)
(**********************************************************************)
val init_counters =
Symtab.make [("c_COMBI", 0), ("c_COMBK", 0),
("c_COMBB", 0), ("c_COMBC", 0),
("c_COMBS", 0), ("c_COMBB_e", 0),
("c_COMBC_e", 0), ("c_COMBS_e", 0)];
fun count_combterm (CombConst(c,tp,_), ct) =
(case Symtab.lookup ct c of NONE => ct (*no counter*)
| SOME n => Symtab.update (c,n+1) ct)
| count_combterm (CombFree(v,tp), ct) = ct
| count_combterm (CombVar(v,tp), ct) = ct
| count_combterm (CombApp(t1,t2,tp), ct) = count_combterm(t1, count_combterm(t2, ct));
fun count_literal (Literal(_,t), ct) = count_combterm(t,ct);
fun count_clause (Clause{literals,...}, ct) = foldl count_literal ct literals;
fun count_user_clause user_lemmas (Clause{axiom_name,literals,...}, ct) =
if axiom_name mem_string user_lemmas then foldl count_literal ct literals
else ct;
val cnf_helper_thms = ResAxioms.cnf_rules_pairs o (map ResAxioms.pairname)
fun get_helper_clauses ct =
let fun needed c = valOf (Symtab.lookup ct c) > 0
val IK = if needed "c_COMBI" orelse needed "c_COMBK"
then (Output.debug "Include combinator I K"; cnf_helper_thms [comb_I,comb_K])
else []
val BC = if needed "c_COMBB" orelse needed "c_COMBC"
then (Output.debug "Include combinator B C"; cnf_helper_thms [comb_B,comb_C])
else []
val S = if needed "c_COMBS"
then (Output.debug "Include combinator S"; cnf_helper_thms [comb_S])
else []
val B'C' = if needed "c_COMBB_e" orelse needed "c_COMBC_e"
then (Output.debug "Include combinator B' C'"; cnf_helper_thms [comb_B', comb_C'])
else []
val S' = if needed "c_COMBS_e"
then (Output.debug "Include combinator S'"; cnf_helper_thms [comb_S'])
else []
val other = cnf_helper_thms [ext,fequal_imp_equal,equal_imp_fequal]
in
make_axiom_clauses (other @ IK @ BC @ S @ B'C' @ S')
end
(* tptp format *)
(* write TPTP format to a single file *)
fun tptp_write_file thms filename (axclauses,classrel_clauses,arity_clauses) user_lemmas =
let val conjectures = make_conjecture_clauses thms
val (clnames,axclauses') = ListPair.unzip (make_axiom_clauses axclauses)
val (tptp_clss,tfree_litss) = ListPair.unzip (map clause2tptp conjectures)
val tfree_clss = map ResClause.tptp_tfree_clause (foldl (op union_string) [] tfree_litss)
val out = TextIO.openOut filename
val ct = foldl (count_user_clause user_lemmas)
(foldl count_clause init_counters conjectures)
axclauses'
val helper_clauses = map #2 (get_helper_clauses ct)
in
List.app (curry TextIO.output out o #1 o clause2tptp) axclauses';
ResClause.writeln_strs out tfree_clss;
ResClause.writeln_strs out tptp_clss;
List.app (curry TextIO.output out o ResClause.tptp_classrelClause) classrel_clauses;
List.app (curry TextIO.output out o ResClause.tptp_arity_clause) arity_clauses;
List.app (curry TextIO.output out o #1 o clause2tptp) helper_clauses;
TextIO.closeOut out;
clnames
end;
(* dfg format *)
fun dfg_write_file thms filename (axclauses,classrel_clauses,arity_clauses) user_lemmas =
let val _ = Output.debug ("Preparing to write the DFG file " ^ filename)
val conjectures = make_conjecture_clauses thms
val (clnames,axclauses') = ListPair.unzip (make_axiom_clauses axclauses)
val (dfg_clss,tfree_litss) = ListPair.unzip (map clause2dfg conjectures)
and probname = Path.pack (Path.base (Path.unpack filename))
val axstrs = map (#1 o clause2dfg) axclauses'
val tfree_clss = map ResClause.dfg_tfree_clause (ResClause.union_all tfree_litss)
val out = TextIO.openOut filename
val ct = foldl (count_user_clause user_lemmas)
(foldl count_clause init_counters conjectures)
axclauses'
val helper_clauses = map #2 (get_helper_clauses ct)
val helper_clauses_strs = map (#1 o clause2dfg) helper_clauses
val funcs = funcs_of_clauses (helper_clauses @ conjectures @ axclauses') arity_clauses
and preds = preds_of_clauses axclauses' classrel_clauses arity_clauses
in
TextIO.output (out, ResClause.string_of_start probname);
TextIO.output (out, ResClause.string_of_descrip probname);
TextIO.output (out, ResClause.string_of_symbols (ResClause.string_of_funcs funcs) (ResClause.string_of_preds preds));
TextIO.output (out, "list_of_clauses(axioms,cnf).\n");
ResClause.writeln_strs out axstrs;
List.app (curry TextIO.output out o ResClause.dfg_classrelClause) classrel_clauses;
List.app (curry TextIO.output out o ResClause.dfg_arity_clause) arity_clauses;
ResClause.writeln_strs out helper_clauses_strs;
TextIO.output (out, "end_of_list.\n\nlist_of_clauses(conjectures,cnf).\n");
ResClause.writeln_strs out tfree_clss;
ResClause.writeln_strs out dfg_clss;
TextIO.output (out, "end_of_list.\n\n");
(*VarWeight=3 helps the HO problems, probably by counteracting the presence of hAPP*)
TextIO.output (out, "list_of_settings(SPASS).\n{*\nset_flag(VarWeight,3).\n*}\nend_of_list.\n\n");
TextIO.output (out, "end_problem.\n");
TextIO.closeOut out;
clnames
end;
end