src/HOL/Tools/res_axioms.ML
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Thm.fold_terms;
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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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Transformation of axiom rules (elim/intro/etc) into CNF forms.
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*)
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signature RES_AXIOMS =
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sig
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  val trace_abs: bool ref
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  val cnf_axiom : string * thm -> thm list
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  val cnf_name : string -> thm list
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  val meta_cnf_axiom : thm -> thm list
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  val pairname : thm -> string * thm
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  val skolem_thm : thm -> thm list
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  val to_nnf : thm -> thm
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  val cnf_rules_pairs : (string * thm) list -> (thm * (string * int)) list
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  val meson_method_setup : theory -> theory
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  val setup : theory -> theory
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  val assume_abstract_list: thm list -> thm list
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  val neg_conjecture_clauses: thm -> int -> thm list * (string * typ) list
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  val claset_rules_of: Proof.context -> (string * thm) list   (*FIXME DELETE*)
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  val simpset_rules_of: Proof.context -> (string * thm) list  (*FIXME DELETE*)
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  val atpset_rules_of: Proof.context -> (string * thm) list
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end;
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structure ResAxioms =
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struct
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(*For running the comparison between combinators and abstractions.
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  CANNOT be a ref, as the setting is used while Isabelle is built.
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  Currently TRUE: the combinator code cannot be used with proof reconstruction
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  because it is not performed by inference!!*)
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val abstract_lambdas = true;
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val trace_abs = ref false;
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(* FIXME legacy *)
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fun freeze_thm th = #1 (Drule.freeze_thaw th);
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val lhs_of = #1 o Logic.dest_equals o Thm.prop_of;
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val rhs_of = #2 o Logic.dest_equals o Thm.prop_of;
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(*Store definitions of abstraction functions, ensuring that identical right-hand
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  sides are denoted by the same functions and thereby reducing the need for
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  extensionality in proofs.
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  FIXME!  Store in theory data!!*)
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(*Populate the abstraction cache with common combinators.*)
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fun seed th net =
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  let val (_,ct) = Thm.dest_abs NONE (Drule.rhs_of th)
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      val t = Logic.legacy_varify (term_of ct)
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  in  Net.insert_term Thm.eq_thm (t, th) net end;
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val abstraction_cache = ref 
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      (seed (thm"ATP_Linkup.I_simp") 
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       (seed (thm"ATP_Linkup.B_simp") 
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	(seed (thm"ATP_Linkup.K_simp") Net.empty)));
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(**** Transformation of Elimination Rules into First-Order Formulas****)
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val cfalse = cterm_of HOL.thy HOLogic.false_const;
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val ctp_false = cterm_of HOL.thy (HOLogic.mk_Trueprop HOLogic.false_const);
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(*Converts an elim-rule into an equivalent theorem that does not have the
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  predicate variable.  Leaves other theorems unchanged.  We simply instantiate the
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  conclusion variable to False.*)
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fun transform_elim th =
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  case concl_of th of    (*conclusion variable*)
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       Const("Trueprop",_) $ (v as Var(_,Type("bool",[]))) => 
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           Thm.instantiate ([], [(cterm_of HOL.thy v, cfalse)]) th
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    | v as Var(_, Type("prop",[])) => 
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           Thm.instantiate ([], [(cterm_of HOL.thy v, ctp_false)]) th
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    | _ => th;
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(**** Transformation of Clasets and Simpsets into First-Order Axioms ****)
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(*Transfer a theorem into theory ATP_Linkup.thy if it is not already
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  inside that theory -- because it's needed for Skolemization *)
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(*This will refer to the final version of theory ATP_Linkup.*)
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val recon_thy_ref = Theory.self_ref (the_context ());
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(*If called while ATP_Linkup is being created, it will transfer to the
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  current version. If called afterward, it will transfer to the final version.*)
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fun transfer_to_ATP_Linkup th =
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    transfer (Theory.deref recon_thy_ref) th handle THM _ => th;
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(**** SKOLEMIZATION BY INFERENCE (lcp) ****)
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(*Traverse a theorem, declaring Skolem function definitions. String s is the suggested
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  prefix for the Skolem constant. Result is a new theory*)
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fun declare_skofuns s th thy =
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  let val nref = ref 0
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      fun dec_sko (Const ("Ex",_) $ (xtp as Abs(_,T,p))) (thy, axs) =
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            (*Existential: declare a Skolem function, then insert into body and continue*)
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            let val cname = Name.internal (s ^ "_sko" ^ Int.toString (inc nref))
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                val args = term_frees xtp  (*get the formal parameter list*)
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                val Ts = map type_of args
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                val cT = Ts ---> T
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                val c = Const (Sign.full_name thy cname, cT)
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                val rhs = list_abs_free (map dest_Free args, HOLogic.choice_const T $ xtp)
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                        (*Forms a lambda-abstraction over the formal parameters*)
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                val thy' = Sign.add_consts_authentic [(cname, cT, NoSyn)] thy
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                           (*Theory is augmented with the constant, then its def*)
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                val cdef = cname ^ "_def"
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                val thy'' = Theory.add_defs_i false false [(cdef, equals cT $ c $ rhs)] thy'
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            in dec_sko (subst_bound (list_comb(c,args), p))
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                       (thy'', get_axiom thy'' cdef :: axs)
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            end
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        | dec_sko (Const ("All",_) $ (xtp as Abs(a,T,p))) thx =
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            (*Universal quant: insert a free variable into body and continue*)
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            let val fname = Name.variant (add_term_names (p,[])) a
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            in dec_sko (subst_bound (Free(fname,T), p)) thx end
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        | dec_sko (Const ("op &", _) $ p $ q) thx = dec_sko q (dec_sko p thx)
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        | dec_sko (Const ("op |", _) $ p $ q) thx = dec_sko q (dec_sko p thx)
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        | dec_sko (Const ("Trueprop", _) $ p) thx = dec_sko p thx
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        | dec_sko t thx = thx (*Do nothing otherwise*)
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  in  dec_sko (prop_of th) (thy,[])  end;
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(*Traverse a theorem, accumulating Skolem function definitions.*)
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fun assume_skofuns th =
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  let fun dec_sko (Const ("Ex",_) $ (xtp as Abs(_,T,p))) defs =
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            (*Existential: declare a Skolem function, then insert into body and continue*)
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            let val skos = map (#1 o Logic.dest_equals) defs  (*existing sko fns*)
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                val args = term_frees xtp \\ skos  (*the formal parameters*)
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                val Ts = map type_of args
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                val cT = Ts ---> T
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                val c = Free (gensym "sko_", cT)
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                val rhs = list_abs_free (map dest_Free args,
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                                         HOLogic.choice_const T $ xtp)
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                      (*Forms a lambda-abstraction over the formal parameters*)
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                val def = equals cT $ c $ rhs
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            in dec_sko (subst_bound (list_comb(c,args), p))
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                       (def :: defs)
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            end
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        | dec_sko (Const ("All",_) $ (xtp as Abs(a,T,p))) defs =
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            (*Universal quant: insert a free variable into body and continue*)
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            let val fname = Name.variant (add_term_names (p,[])) a
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            in dec_sko (subst_bound (Free(fname,T), p)) defs end
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        | dec_sko (Const ("op &", _) $ p $ q) defs = dec_sko q (dec_sko p defs)
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        | dec_sko (Const ("op |", _) $ p $ q) defs = dec_sko q (dec_sko p defs)
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        | dec_sko (Const ("Trueprop", _) $ p) defs = dec_sko p defs
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        | dec_sko t defs = defs (*Do nothing otherwise*)
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  in  dec_sko (prop_of th) []  end;
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(**** REPLACING ABSTRACTIONS BY FUNCTION DEFINITIONS ****)
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(*Returns the vars of a theorem*)
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fun vars_of_thm th =
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  map (Thm.cterm_of (theory_of_thm th) o Var) (Thm.fold_terms Term.add_vars th []);
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(*Make a version of fun_cong with a given variable name*)
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local
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    val fun_cong' = fun_cong RS asm_rl; (*renumber f, g to prevent clashes with (a,0)*)
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    val cx = hd (vars_of_thm fun_cong');
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    val ty = typ_of (ctyp_of_term cx);
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    val thy = theory_of_thm fun_cong;
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    fun mkvar a = cterm_of thy (Var((a,0),ty));
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in
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fun xfun_cong x = Thm.instantiate ([], [(cx, mkvar x)]) fun_cong'
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end;
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(*Removes the lambdas from an equation of the form t = (%x. u).  A non-negative n,
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  serves as an upper bound on how many to remove.*)
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fun strip_lambdas 0 th = th
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  | strip_lambdas n th = 
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      case prop_of th of
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	  _ $ (Const ("op =", _) $ _ $ Abs (x,_,_)) =>
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	      strip_lambdas (n-1) (freeze_thm (th RS xfun_cong x))
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	| _ => th;
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(*Convert meta- to object-equality. Fails for theorems like split_comp_eq,
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  where some types have the empty sort.*)
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val meta_eq_to_obj_eq = thm "meta_eq_to_obj_eq";
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fun mk_object_eq th = th RS meta_eq_to_obj_eq
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    handle THM _ => error ("Theorem contains empty sort: " ^ string_of_thm th);
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(*Apply a function definition to an argument, beta-reducing the result.*)
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fun beta_comb cf x =
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  let val th1 = combination cf (reflexive x)
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      val th2 = beta_conversion false (Drule.rhs_of th1)
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  in  transitive th1 th2  end;
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(*Apply a function definition to arguments, beta-reducing along the way.*)
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fun list_combination cf [] = cf
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  | list_combination cf (x::xs) = list_combination (beta_comb cf x) xs;
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fun list_cabs ([] ,     t) = t
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  | list_cabs (v::vars, t) = Thm.cabs v (list_cabs(vars,t));
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fun assert_eta_free ct =
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  let val t = term_of ct
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  in if (t aconv Envir.eta_contract t) then ()
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     else error ("Eta redex in term: " ^ string_of_cterm ct)
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  end;
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fun eq_absdef (th1, th2) =
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    Context.joinable (theory_of_thm th1, theory_of_thm th2)  andalso
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    rhs_of th1 aconv rhs_of th2;
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fun lambda_free (Abs _) = false
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  | lambda_free (t $ u) = lambda_free t andalso lambda_free u
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  | lambda_free _ = true;
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fun monomorphic t =
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  Term.fold_types (Term.fold_atyps (fn TVar _ => K false | _ => I)) t true;
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fun dest_abs_list ct =
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  let val (cv,ct') = Thm.dest_abs NONE ct
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      val (cvs,cu) = dest_abs_list ct'
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  in (cv::cvs, cu) end
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  handle CTERM _ => ([],ct);
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fun lambda_list [] u = u
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  | lambda_list (v::vs) u = lambda v (lambda_list vs u);
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fun abstract_rule_list [] [] th = th
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  | abstract_rule_list (v::vs) (ct::cts) th = abstract_rule v ct (abstract_rule_list vs cts th)
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  | abstract_rule_list _ _ th = raise THM ("abstract_rule_list", 0, [th]);
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val Envir.Envir {asol = tenv0, iTs = tyenv0, ...} = Envir.empty 0
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(*Does an existing abstraction definition have an RHS that matches the one we need now?
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  thy is the current theory, which must extend that of theorem th.*)
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fun match_rhs thy t th =
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  let val _ = if !trace_abs then warning ("match_rhs: " ^ string_of_cterm (cterm_of thy t) ^ 
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                                          " against\n" ^ string_of_thm th) else ();
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      val (tyenv,tenv) = Pattern.first_order_match thy (rhs_of th, t) (tyenv0,tenv0)
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      val term_insts = map Meson.term_pair_of (Vartab.dest tenv)
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      val ct_pairs = if subthy (theory_of_thm th, thy) andalso 
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                        forall lambda_free (map #2 term_insts) 
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                     then map (pairself (cterm_of thy)) term_insts
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                     else raise Pattern.MATCH (*Cannot allow lambdas in the instantiation*)
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      fun ctyp2 (ixn, (S, T)) = (ctyp_of thy (TVar (ixn, S)), ctyp_of thy T)
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      val th' = cterm_instantiate ct_pairs th
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  in  SOME (th, instantiate (map ctyp2 (Vartab.dest tyenv), []) th')  end
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  handle _ => NONE;
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(*Traverse a theorem, declaring abstraction function definitions. String s is the suggested
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  prefix for the constants. Resulting theory is returned in the first theorem. *)
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fun declare_absfuns th =
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  let fun abstract thy ct =
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        if lambda_free (term_of ct) then (transfer thy (reflexive ct), [])
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        else
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        case term_of ct of
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          Abs _ =>
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            let val cname = Name.internal (gensym "abs_");
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                val _ = assert_eta_free ct;
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                val (cvs,cta) = dest_abs_list ct
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                val (vs,Tvs) = ListPair.unzip (map (dest_Free o term_of) cvs)
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                val _ = if !trace_abs then warning ("Nested lambda: " ^ string_of_cterm cta) else ();
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                val (u'_th,defs) = abstract thy cta
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                val _ = if !trace_abs then warning ("Returned " ^ string_of_thm u'_th) else ();
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                val cu' = Drule.rhs_of u'_th
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                val u' = term_of cu'
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                val abs_v_u = lambda_list (map term_of cvs) u'
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                (*get the formal parameters: ALL variables free in the term*)
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                val args = term_frees abs_v_u
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                val _ = if !trace_abs then warning (Int.toString (length args) ^ " arguments") else ();
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                val rhs = list_abs_free (map dest_Free args, abs_v_u)
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                      (*Forms a lambda-abstraction over the formal parameters*)
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                val _ = if !trace_abs then warning ("Looking up " ^ string_of_cterm cu') else ();
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                val thy = theory_of_thm u'_th
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                val (ax,ax',thy) =
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                 case List.mapPartial (match_rhs thy abs_v_u) 
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                         (Net.match_term (!abstraction_cache) u') of
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                     (ax,ax')::_ => 
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                       (if !trace_abs then warning ("Re-using axiom " ^ string_of_thm ax) else ();
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                        (ax,ax',thy))
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                   | [] =>
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                      let val _ = if !trace_abs then warning "Lookup was empty" else ();
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                          val Ts = map type_of args
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                          val cT = Ts ---> (Tvs ---> typ_of (ctyp_of_term cu'))
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                          val c = Const (Sign.full_name thy cname, cT)
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                          val thy = Sign.add_consts_authentic [(cname, cT, NoSyn)] thy
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                                     (*Theory is augmented with the constant,
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                                       then its definition*)
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                          val cdef = cname ^ "_def"
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                          val thy = Theory.add_defs_i false false
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                                       [(cdef, equals cT $ c $ rhs)] thy
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                          val _ = if !trace_abs then (warning ("Definition is " ^ 
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                                                      string_of_thm (get_axiom thy cdef))) 
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                                  else ();
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                          val ax = get_axiom thy cdef |> freeze_thm
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                                     |> mk_object_eq |> strip_lambdas (length args)
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                                     |> mk_meta_eq |> Meson.generalize
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                          val (_,ax') = Option.valOf (match_rhs thy abs_v_u ax)
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                          val _ = if !trace_abs then 
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                                    (warning ("Declaring: " ^ string_of_thm ax);
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                                     warning ("Instance: " ^ string_of_thm ax')) 
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                                  else ();
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                          val _ = abstraction_cache := Net.insert_term eq_absdef 
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                                            ((Logic.varify u'), ax) (!abstraction_cache)
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                            handle Net.INSERT =>
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                              raise THM ("declare_absfuns: INSERT", 0, [th,u'_th,ax])
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                       in  (ax,ax',thy)  end
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            in if !trace_abs then warning ("Lookup result: " ^ string_of_thm ax') else ();
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               (transitive (abstract_rule_list vs cvs u'_th) (symmetric ax'), ax::defs) end
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        | (t1$t2) =>
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            let val (ct1,ct2) = Thm.dest_comb ct
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                val (th1,defs1) = abstract thy ct1
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                val (th2,defs2) = abstract (theory_of_thm th1) ct2
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            in  (combination th1 th2, defs1@defs2)  end
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      val _ = if !trace_abs then warning ("declare_absfuns, Abstracting: " ^ string_of_thm th) else ();
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      val (eqth,defs) = abstract (theory_of_thm th) (cprop_of th)
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      val ths = equal_elim eqth th :: map (strip_lambdas ~1 o mk_object_eq o freeze_thm) defs
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      val _ = if !trace_abs then warning ("declare_absfuns, Result: " ^ string_of_thm (hd ths)) else ();
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  in  (theory_of_thm eqth, map Drule.eta_contraction_rule ths)  end;
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fun name_of def = try (#1 o dest_Free o lhs_of) def;
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(*A name is valid provided it isn't the name of a defined abstraction.*)
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fun valid_name defs (Free(x,T)) = not (x mem_string (List.mapPartial name_of defs))
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  | valid_name defs _ = false;
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fun assume_absfuns th =
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  let val thy = theory_of_thm th
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      val cterm = cterm_of thy
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      fun abstract ct =
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        if lambda_free (term_of ct) then (reflexive ct, [])
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        else
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        case term_of ct of
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          Abs (_,T,u) =>
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            let val _ = assert_eta_free ct;
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                val (cvs,cta) = dest_abs_list ct
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                val (vs,Tvs) = ListPair.unzip (map (dest_Free o term_of) cvs)
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                val (u'_th,defs) = abstract cta
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                val cu' = Drule.rhs_of u'_th
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                val u' = term_of cu'
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                (*Could use Thm.cabs instead of lambda to work at level of cterms*)
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                val abs_v_u = lambda_list (map term_of cvs) (term_of cu')
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                (*get the formal parameters: free variables not present in the defs
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                  (to avoid taking abstraction function names as parameters) *)
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                val args = filter (valid_name defs) (term_frees abs_v_u)
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                val crhs = list_cabs (map cterm args, cterm abs_v_u)
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                      (*Forms a lambda-abstraction over the formal parameters*)
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                val rhs = term_of crhs
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                val (ax,ax') =
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                 case List.mapPartial (match_rhs thy abs_v_u) 
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                        (Net.match_term (!abstraction_cache) u') of
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                     (ax,ax')::_ => 
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                       (if !trace_abs then warning ("Re-using axiom " ^ string_of_thm ax) else ();
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                        (ax,ax'))
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                   | [] =>
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                      let val Ts = map type_of args
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                          val const_ty = Ts ---> (Tvs ---> typ_of (ctyp_of_term cu'))
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                          val c = Free (gensym "abs_", const_ty)
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                          val ax = assume (Thm.capply (cterm (equals const_ty $ c)) crhs)
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                                     |> mk_object_eq |> strip_lambdas (length args)
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                                     |> mk_meta_eq |> Meson.generalize
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                          val (_,ax') = Option.valOf (match_rhs thy abs_v_u ax)
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                          val _ = abstraction_cache := Net.insert_term eq_absdef (rhs,ax)
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                                    (!abstraction_cache)
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                            handle Net.INSERT =>
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                              raise THM ("assume_absfuns: INSERT", 0, [th,u'_th,ax])
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                      in (ax,ax') end
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            in if !trace_abs then warning ("Lookup result: " ^ string_of_thm ax') else ();
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               (transitive (abstract_rule_list vs cvs u'_th) (symmetric ax'), ax::defs) end
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        | (t1$t2) =>
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            let val (ct1,ct2) = Thm.dest_comb ct
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                val (t1',defs1) = abstract ct1
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                val (t2',defs2) = abstract ct2
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            in  (combination t1' t2', defs1@defs2)  end
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      val _ = if !trace_abs then warning ("assume_absfuns, Abstracting: " ^ string_of_thm th) else ();
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      val (eqth,defs) = abstract (cprop_of th)
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      val ths = equal_elim eqth th :: map (strip_lambdas ~1 o mk_object_eq o freeze_thm) defs
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      val _ = if !trace_abs then warning ("assume_absfuns, Result: " ^ string_of_thm (hd ths)) else ();
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  in  map Drule.eta_contraction_rule ths  end;
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(*cterms are used throughout for efficiency*)
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val cTrueprop = Thm.cterm_of HOL.thy HOLogic.Trueprop;
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(*cterm version of mk_cTrueprop*)
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fun c_mkTrueprop A = Thm.capply cTrueprop A;
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(*Given an abstraction over n variables, replace the bound variables by free
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  ones. Return the body, along with the list of free variables.*)
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fun c_variant_abs_multi (ct0, vars) =
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      let val (cv,ct) = Thm.dest_abs NONE ct0
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      in  c_variant_abs_multi (ct, cv::vars)  end
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      handle CTERM _ => (ct0, rev vars);
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(*Given the definition of a Skolem function, return a theorem to replace
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  an existential formula by a use of that function.
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   Example: "EX x. x : A & x ~: B ==> sko A B : A & sko A B ~: B"  [.] *)
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fun skolem_of_def def =
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  let val (c,rhs) = Drule.dest_equals (cprop_of (freeze_thm def))
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   395
      val (ch, frees) = c_variant_abs_multi (rhs, [])
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   396
      val (chilbert,cabs) = Thm.dest_comb ch
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diff changeset
   397
      val {thy,t, ...} = rep_cterm chilbert
18141
89e2e8bed08f Skolemization by inference, but not quite finished
paulson
parents: 18009
diff changeset
   398
      val T = case t of Const ("Hilbert_Choice.Eps", Type("fun",[_,T])) => T
89e2e8bed08f Skolemization by inference, but not quite finished
paulson
parents: 18009
diff changeset
   399
                      | _ => raise THM ("skolem_of_def: expected Eps", 0, [def])
22596
d0d2af4db18f rep_thm/cterm/ctyp: removed obsolete sign field;
wenzelm
parents: 22516
diff changeset
   400
      val cex = Thm.cterm_of thy (HOLogic.exists_const T)
16009
a6d480e6c5f0 Skolemization of simprules and classical rules
paulson
parents: 15997
diff changeset
   401
      val ex_tm = c_mkTrueprop (Thm.capply cex cabs)
a6d480e6c5f0 Skolemization of simprules and classical rules
paulson
parents: 15997
diff changeset
   402
      and conc =  c_mkTrueprop (Drule.beta_conv cabs (Drule.list_comb(c,frees)));
18141
89e2e8bed08f Skolemization by inference, but not quite finished
paulson
parents: 18009
diff changeset
   403
      fun tacf [prem] = rewrite_goals_tac [def] THEN rtac (prem RS someI_ex) 1
20461
d689ad772b2c skolem_cache_thm: Drule.close_derivation on clauses preserves some space;
wenzelm
parents: 20457
diff changeset
   404
  in  Goal.prove_raw [ex_tm] conc tacf
18141
89e2e8bed08f Skolemization by inference, but not quite finished
paulson
parents: 18009
diff changeset
   405
       |> forall_intr_list frees
89e2e8bed08f Skolemization by inference, but not quite finished
paulson
parents: 18009
diff changeset
   406
       |> forall_elim_vars 0  (*Introduce Vars, but don't discharge defs.*)
89e2e8bed08f Skolemization by inference, but not quite finished
paulson
parents: 18009
diff changeset
   407
       |> Thm.varifyT
89e2e8bed08f Skolemization by inference, but not quite finished
paulson
parents: 18009
diff changeset
   408
  end;
16009
a6d480e6c5f0 Skolemization of simprules and classical rules
paulson
parents: 15997
diff changeset
   409
20863
4ee61dbf192d improvements to abstraction, ensuring more re-use of abstraction functions
paulson
parents: 20789
diff changeset
   410
(*Converts an Isabelle theorem (intro, elim or simp format, even higher-order) into NNF.*)
20461
d689ad772b2c skolem_cache_thm: Drule.close_derivation on clauses preserves some space;
wenzelm
parents: 20457
diff changeset
   411
fun to_nnf th =
21254
d53f76357f41 incorporated former theories Reconstruction and ResAtpMethods into ATP_Linkup;
wenzelm
parents: 21102
diff changeset
   412
    th |> transfer_to_ATP_Linkup
20863
4ee61dbf192d improvements to abstraction, ensuring more re-use of abstraction functions
paulson
parents: 20789
diff changeset
   413
       |> transform_elim |> zero_var_indexes |> freeze_thm
4ee61dbf192d improvements to abstraction, ensuring more re-use of abstraction functions
paulson
parents: 20789
diff changeset
   414
       |> ObjectLogic.atomize_thm |> make_nnf |> strip_lambdas ~1;
16009
a6d480e6c5f0 Skolemization of simprules and classical rules
paulson
parents: 15997
diff changeset
   415
18141
89e2e8bed08f Skolemization by inference, but not quite finished
paulson
parents: 18009
diff changeset
   416
(*Generate Skolem functions for a theorem supplied in nnf*)
89e2e8bed08f Skolemization by inference, but not quite finished
paulson
parents: 18009
diff changeset
   417
fun skolem_of_nnf th =
89e2e8bed08f Skolemization by inference, but not quite finished
paulson
parents: 18009
diff changeset
   418
  map (skolem_of_def o assume o (cterm_of (theory_of_thm th))) (assume_skofuns th);
89e2e8bed08f Skolemization by inference, but not quite finished
paulson
parents: 18009
diff changeset
   419
20863
4ee61dbf192d improvements to abstraction, ensuring more re-use of abstraction functions
paulson
parents: 20789
diff changeset
   420
fun assert_lambda_free ths msg = 
4ee61dbf192d improvements to abstraction, ensuring more re-use of abstraction functions
paulson
parents: 20789
diff changeset
   421
  case filter (not o lambda_free o prop_of) ths of
4ee61dbf192d improvements to abstraction, ensuring more re-use of abstraction functions
paulson
parents: 20789
diff changeset
   422
      [] => ()
4ee61dbf192d improvements to abstraction, ensuring more re-use of abstraction functions
paulson
parents: 20789
diff changeset
   423
     | ths' => error (msg ^ "\n" ^ space_implode "\n" (map string_of_thm ths'));
20457
85414caac94a refinements to conversion into clause form, esp for the HO case
paulson
parents: 20445
diff changeset
   424
20445
b222d9939e00 improvements to abstraction generation
paulson
parents: 20421
diff changeset
   425
fun assume_abstract th =
20457
85414caac94a refinements to conversion into clause form, esp for the HO case
paulson
parents: 20445
diff changeset
   426
  if lambda_free (prop_of th) then [th]
20863
4ee61dbf192d improvements to abstraction, ensuring more re-use of abstraction functions
paulson
parents: 20789
diff changeset
   427
  else th |> Drule.eta_contraction_rule |> assume_absfuns
20457
85414caac94a refinements to conversion into clause form, esp for the HO case
paulson
parents: 20445
diff changeset
   428
          |> tap (fn ths => assert_lambda_free ths "assume_abstract: lambdas")
20445
b222d9939e00 improvements to abstraction generation
paulson
parents: 20421
diff changeset
   429
20419
df257a9cf0e9 abstraction of lambda-expressions
paulson
parents: 20373
diff changeset
   430
(*Replace lambdas by assumed function definitions in the theorems*)
20445
b222d9939e00 improvements to abstraction generation
paulson
parents: 20421
diff changeset
   431
fun assume_abstract_list ths =
b222d9939e00 improvements to abstraction generation
paulson
parents: 20421
diff changeset
   432
  if abstract_lambdas then List.concat (map assume_abstract ths)
20863
4ee61dbf192d improvements to abstraction, ensuring more re-use of abstraction functions
paulson
parents: 20789
diff changeset
   433
  else map Drule.eta_contraction_rule ths;
20419
df257a9cf0e9 abstraction of lambda-expressions
paulson
parents: 20373
diff changeset
   434
df257a9cf0e9 abstraction of lambda-expressions
paulson
parents: 20373
diff changeset
   435
(*Replace lambdas by declared function definitions in the theorems*)
df257a9cf0e9 abstraction of lambda-expressions
paulson
parents: 20373
diff changeset
   436
fun declare_abstract' (thy, []) = (thy, [])
df257a9cf0e9 abstraction of lambda-expressions
paulson
parents: 20373
diff changeset
   437
  | declare_abstract' (thy, th::ths) =
20461
d689ad772b2c skolem_cache_thm: Drule.close_derivation on clauses preserves some space;
wenzelm
parents: 20457
diff changeset
   438
      let val (thy', th_defs) =
20457
85414caac94a refinements to conversion into clause form, esp for the HO case
paulson
parents: 20445
diff changeset
   439
            if lambda_free (prop_of th) then (thy, [th])
20445
b222d9939e00 improvements to abstraction generation
paulson
parents: 20421
diff changeset
   440
            else
20863
4ee61dbf192d improvements to abstraction, ensuring more re-use of abstraction functions
paulson
parents: 20789
diff changeset
   441
                th |> zero_var_indexes |> freeze_thm
4ee61dbf192d improvements to abstraction, ensuring more re-use of abstraction functions
paulson
parents: 20789
diff changeset
   442
                   |> Drule.eta_contraction_rule |> transfer thy |> declare_absfuns
20461
d689ad772b2c skolem_cache_thm: Drule.close_derivation on clauses preserves some space;
wenzelm
parents: 20457
diff changeset
   443
          val _ = assert_lambda_free th_defs "declare_abstract: lambdas"
d689ad772b2c skolem_cache_thm: Drule.close_derivation on clauses preserves some space;
wenzelm
parents: 20457
diff changeset
   444
          val (thy'', ths') = declare_abstract' (thy', ths)
20419
df257a9cf0e9 abstraction of lambda-expressions
paulson
parents: 20373
diff changeset
   445
      in  (thy'', th_defs @ ths')  end;
df257a9cf0e9 abstraction of lambda-expressions
paulson
parents: 20373
diff changeset
   446
df257a9cf0e9 abstraction of lambda-expressions
paulson
parents: 20373
diff changeset
   447
fun declare_abstract (thy, ths) =
df257a9cf0e9 abstraction of lambda-expressions
paulson
parents: 20373
diff changeset
   448
  if abstract_lambdas then declare_abstract' (thy, ths)
20863
4ee61dbf192d improvements to abstraction, ensuring more re-use of abstraction functions
paulson
parents: 20789
diff changeset
   449
  else (thy, map Drule.eta_contraction_rule ths);
20419
df257a9cf0e9 abstraction of lambda-expressions
paulson
parents: 20373
diff changeset
   450
18510
0a6c24f549c3 the "skolem" attribute and better initialization of the clause database
paulson
parents: 18404
diff changeset
   451
(*Skolemize a named theorem, with Skolem functions as additional premises.*)
20461
d689ad772b2c skolem_cache_thm: Drule.close_derivation on clauses preserves some space;
wenzelm
parents: 20457
diff changeset
   452
fun skolem_thm th =
18510
0a6c24f549c3 the "skolem" attribute and better initialization of the clause database
paulson
parents: 18404
diff changeset
   453
  let val nnfth = to_nnf th
21470
7c1b59ddcd56 Consolidation of code to "blacklist" unhelpful theorems, including record
paulson
parents: 21430
diff changeset
   454
  in  Meson.make_cnf (skolem_of_nnf nnfth) nnfth |> assume_abstract_list |> Meson.finish_cnf
18510
0a6c24f549c3 the "skolem" attribute and better initialization of the clause database
paulson
parents: 18404
diff changeset
   455
  end
0a6c24f549c3 the "skolem" attribute and better initialization of the clause database
paulson
parents: 18404
diff changeset
   456
  handle THM _ => [];
18141
89e2e8bed08f Skolemization by inference, but not quite finished
paulson
parents: 18009
diff changeset
   457
21071
8d0245c5ed9e Fixed the "exception Empty" bug in elim2Fol
paulson
parents: 20996
diff changeset
   458
(*Keep the full complexity of the original name*)
21858
05f57309170c avoid conflict with Alice keywords: renamed pack -> implode, unpack -> explode, any -> many, avoided assert;
wenzelm
parents: 21646
diff changeset
   459
fun flatten_name s = space_implode "_X" (NameSpace.explode s);
21071
8d0245c5ed9e Fixed the "exception Empty" bug in elim2Fol
paulson
parents: 20996
diff changeset
   460
18510
0a6c24f549c3 the "skolem" attribute and better initialization of the clause database
paulson
parents: 18404
diff changeset
   461
(*Declare Skolem functions for a theorem, supplied in nnf and with its name.
0a6c24f549c3 the "skolem" attribute and better initialization of the clause database
paulson
parents: 18404
diff changeset
   462
  It returns a modified theory, unless skolemization fails.*)
22471
7c51f1a799f3 Removal of axiom names from the theorem cache
paulson
parents: 22360
diff changeset
   463
fun skolem thy th =
7c51f1a799f3 Removal of axiom names from the theorem cache
paulson
parents: 22360
diff changeset
   464
  let val cname = (case PureThy.get_name_hint th of "" => gensym "" | s => flatten_name s)
7c51f1a799f3 Removal of axiom names from the theorem cache
paulson
parents: 22360
diff changeset
   465
      val _ = Output.debug (fn () => "skolemizing " ^ cname ^ ": ")
20461
d689ad772b2c skolem_cache_thm: Drule.close_derivation on clauses preserves some space;
wenzelm
parents: 20457
diff changeset
   466
  in Option.map
d689ad772b2c skolem_cache_thm: Drule.close_derivation on clauses preserves some space;
wenzelm
parents: 20457
diff changeset
   467
        (fn nnfth =>
18141
89e2e8bed08f Skolemization by inference, but not quite finished
paulson
parents: 18009
diff changeset
   468
          let val (thy',defs) = declare_skofuns cname nnfth thy
20419
df257a9cf0e9 abstraction of lambda-expressions
paulson
parents: 20373
diff changeset
   469
              val cnfs = Meson.make_cnf (map skolem_of_def defs) nnfth
df257a9cf0e9 abstraction of lambda-expressions
paulson
parents: 20373
diff changeset
   470
              val (thy'',cnfs') = declare_abstract (thy',cnfs)
22345
85f76b341893 Improved handling of situation when theorem in cache disagrees with theorem supplied: new clauses
paulson
parents: 22218
diff changeset
   471
          in (map Goal.close_result (Meson.finish_cnf cnfs'), thy'')
20419
df257a9cf0e9 abstraction of lambda-expressions
paulson
parents: 20373
diff changeset
   472
          end)
20461
d689ad772b2c skolem_cache_thm: Drule.close_derivation on clauses preserves some space;
wenzelm
parents: 20457
diff changeset
   473
      (SOME (to_nnf th)  handle THM _ => NONE)
18141
89e2e8bed08f Skolemization by inference, but not quite finished
paulson
parents: 18009
diff changeset
   474
  end;
16009
a6d480e6c5f0 Skolemization of simprules and classical rules
paulson
parents: 15997
diff changeset
   475
22516
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   476
structure ThmCache = TheoryDataFun
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   477
(struct
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   478
  val name = "ATP/thm_cache";
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   479
  type T = (thm list) Thmtab.table ref;
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   480
  val empty : T = ref Thmtab.empty;
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   481
  fun copy (ref tab) : T = ref tab;
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   482
  val extend = copy;
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   483
  fun merge _ (ref tab1, ref tab2) : T = ref (Thmtab.merge (K true) (tab1, tab2));
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   484
  fun print _ _ = ();
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   485
end);
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   486
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   487
(*The cache prevents repeated clausification of a theorem, and also repeated declaration of 
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   488
  Skolem functions. The global one holds theorems proved prior to this point. Theory data
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   489
  holds the remaining ones.*)
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   490
val global_clause_cache = ref (Thmtab.empty : (thm list) Thmtab.table);
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   491
18510
0a6c24f549c3 the "skolem" attribute and better initialization of the clause database
paulson
parents: 18404
diff changeset
   492
(*Populate the clause cache using the supplied theorem. Return the clausal form
0a6c24f549c3 the "skolem" attribute and better initialization of the clause database
paulson
parents: 18404
diff changeset
   493
  and modified theory.*)
22516
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   494
fun skolem_cache_thm clause_cache th thy =
22471
7c51f1a799f3 Removal of axiom names from the theorem cache
paulson
parents: 22360
diff changeset
   495
  case Thmtab.lookup (!clause_cache) th of
20461
d689ad772b2c skolem_cache_thm: Drule.close_derivation on clauses preserves some space;
wenzelm
parents: 20457
diff changeset
   496
      NONE =>
22471
7c51f1a799f3 Removal of axiom names from the theorem cache
paulson
parents: 22360
diff changeset
   497
        (case skolem thy (Thm.transfer thy th) of
20461
d689ad772b2c skolem_cache_thm: Drule.close_derivation on clauses preserves some space;
wenzelm
parents: 20457
diff changeset
   498
             NONE => ([th],thy)
22345
85f76b341893 Improved handling of situation when theorem in cache disagrees with theorem supplied: new clauses
paulson
parents: 22218
diff changeset
   499
           | SOME (cls,thy') => 
22471
7c51f1a799f3 Removal of axiom names from the theorem cache
paulson
parents: 22360
diff changeset
   500
                 (if null cls 
7c51f1a799f3 Removal of axiom names from the theorem cache
paulson
parents: 22360
diff changeset
   501
                  then warning ("skolem_cache: empty clause set for " ^ string_of_thm th)
20473
7ef72f030679 Using Drule.local_standard to reduce the space usage
paulson
parents: 20461
diff changeset
   502
                  else ();
22471
7c51f1a799f3 Removal of axiom names from the theorem cache
paulson
parents: 22360
diff changeset
   503
                  change clause_cache (Thmtab.update (th, cls)); 
22345
85f76b341893 Improved handling of situation when theorem in cache disagrees with theorem supplied: new clauses
paulson
parents: 22218
diff changeset
   504
                  (cls,thy')))
22471
7c51f1a799f3 Removal of axiom names from the theorem cache
paulson
parents: 22360
diff changeset
   505
    | SOME cls => (cls,thy);
20461
d689ad772b2c skolem_cache_thm: Drule.close_derivation on clauses preserves some space;
wenzelm
parents: 20457
diff changeset
   506
d689ad772b2c skolem_cache_thm: Drule.close_derivation on clauses preserves some space;
wenzelm
parents: 20457
diff changeset
   507
(*Exported function to convert Isabelle theorems into axiom clauses*)
22471
7c51f1a799f3 Removal of axiom names from the theorem cache
paulson
parents: 22360
diff changeset
   508
fun cnf_axiom th =
22516
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   509
  let val cache = ThmCache.get (Thm.theory_of_thm th)
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   510
                  handle ERROR _ => global_clause_cache
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   511
      val in_cache = if cache = global_clause_cache then NONE else Thmtab.lookup (!cache) th
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   512
  in
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   513
     case in_cache of
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   514
       NONE => 
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   515
	 (case Thmtab.lookup (!global_clause_cache) th of
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   516
	   NONE => 
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   517
	     let val cls = map Goal.close_result (skolem_thm th)
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   518
	     in Output.debug (fn () => "inserted into cache: " ^ PureThy.get_name_hint th);
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   519
		change cache (Thmtab.update (th, cls)); cls 
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   520
	     end
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   521
	 | SOME cls => cls)
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   522
     | SOME cls => cls
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   523
  end;
15347
14585bc8fa09 resolution package tools by Jia Meng
paulson
parents:
diff changeset
   524
21646
c07b5b0e8492 thm/prf: separate official name vs. additional tags;
wenzelm
parents: 21602
diff changeset
   525
fun pairname th = (PureThy.get_name_hint th, th);
18141
89e2e8bed08f Skolemization by inference, but not quite finished
paulson
parents: 18009
diff changeset
   526
15872
8336ff711d80 fixed treatment of higher-order simprules
paulson
parents: 15736
diff changeset
   527
(**** Extract and Clausify theorems from a theory's claset and simpset ****)
15347
14585bc8fa09 resolution package tools by Jia Meng
paulson
parents:
diff changeset
   528
17484
f6a225f97f0a simplification of the Isabelle-ATP code; hooks for batch generation of problems
paulson
parents: 17412
diff changeset
   529
fun rules_of_claset cs =
f6a225f97f0a simplification of the Isabelle-ATP code; hooks for batch generation of problems
paulson
parents: 17412
diff changeset
   530
  let val {safeIs,safeEs,hazIs,hazEs,...} = rep_cs cs
19175
c6e4b073f6a5 subset_refl now included using the atp attribute
paulson
parents: 19113
diff changeset
   531
      val intros = safeIs @ hazIs
18532
0347c1bba406 elim rules: Classical.classical_rule;
wenzelm
parents: 18510
diff changeset
   532
      val elims  = map Classical.classical_rule (safeEs @ hazEs)
17404
d16c3a62c396 the experimental tagging system, and the usual tidying
paulson
parents: 17279
diff changeset
   533
  in
22130
0906fd95e0b5 Output.debug: non-strict;
wenzelm
parents: 21999
diff changeset
   534
     Output.debug (fn () => "rules_of_claset intros: " ^ Int.toString(length intros) ^
17484
f6a225f97f0a simplification of the Isabelle-ATP code; hooks for batch generation of problems
paulson
parents: 17412
diff changeset
   535
            " elims: " ^ Int.toString(length elims));
20017
a2070352371c made the conversion of elimination rules more robust
paulson
parents: 19894
diff changeset
   536
     map pairname (intros @ elims)
17404
d16c3a62c396 the experimental tagging system, and the usual tidying
paulson
parents: 17279
diff changeset
   537
  end;
15347
14585bc8fa09 resolution package tools by Jia Meng
paulson
parents:
diff changeset
   538
17484
f6a225f97f0a simplification of the Isabelle-ATP code; hooks for batch generation of problems
paulson
parents: 17412
diff changeset
   539
fun rules_of_simpset ss =
f6a225f97f0a simplification of the Isabelle-ATP code; hooks for batch generation of problems
paulson
parents: 17412
diff changeset
   540
  let val ({rules,...}, _) = rep_ss ss
f6a225f97f0a simplification of the Isabelle-ATP code; hooks for batch generation of problems
paulson
parents: 17412
diff changeset
   541
      val simps = Net.entries rules
20461
d689ad772b2c skolem_cache_thm: Drule.close_derivation on clauses preserves some space;
wenzelm
parents: 20457
diff changeset
   542
  in
22130
0906fd95e0b5 Output.debug: non-strict;
wenzelm
parents: 21999
diff changeset
   543
    Output.debug (fn () => "rules_of_simpset: " ^ Int.toString(length simps));
0906fd95e0b5 Output.debug: non-strict;
wenzelm
parents: 21999
diff changeset
   544
    map (fn r => (#name r, #thm r)) simps
17484
f6a225f97f0a simplification of the Isabelle-ATP code; hooks for batch generation of problems
paulson
parents: 17412
diff changeset
   545
  end;
f6a225f97f0a simplification of the Isabelle-ATP code; hooks for batch generation of problems
paulson
parents: 17412
diff changeset
   546
21505
13d4dba99337 prefer Proof.context over Context.generic;
wenzelm
parents: 21470
diff changeset
   547
fun claset_rules_of ctxt = rules_of_claset (local_claset_of ctxt);
13d4dba99337 prefer Proof.context over Context.generic;
wenzelm
parents: 21470
diff changeset
   548
fun simpset_rules_of ctxt = rules_of_simpset (local_simpset_of ctxt);
19196
62ee8c10d796 Added functions to retrieve local and global atpset rules.
mengj
parents: 19175
diff changeset
   549
21505
13d4dba99337 prefer Proof.context over Context.generic;
wenzelm
parents: 21470
diff changeset
   550
fun atpset_rules_of ctxt = map pairname (ResAtpset.get_atpset ctxt);
20774
8f947ffb5eb8 ResAtpset.get_atpset;
wenzelm
parents: 20710
diff changeset
   551
15347
14585bc8fa09 resolution package tools by Jia Meng
paulson
parents:
diff changeset
   552
22471
7c51f1a799f3 Removal of axiom names from the theorem cache
paulson
parents: 22360
diff changeset
   553
(**** Translate a set of theorems into CNF ****)
15347
14585bc8fa09 resolution package tools by Jia Meng
paulson
parents:
diff changeset
   554
19894
7c7e15b27145 the "all_theorems" option and some fixes
paulson
parents: 19630
diff changeset
   555
(* classical rules: works for both FOL and HOL *)
7c7e15b27145 the "all_theorems" option and some fixes
paulson
parents: 19630
diff changeset
   556
fun cnf_rules [] err_list = ([],err_list)
20461
d689ad772b2c skolem_cache_thm: Drule.close_derivation on clauses preserves some space;
wenzelm
parents: 20457
diff changeset
   557
  | cnf_rules ((name,th) :: ths) err_list =
19894
7c7e15b27145 the "all_theorems" option and some fixes
paulson
parents: 19630
diff changeset
   558
      let val (ts,es) = cnf_rules ths err_list
22471
7c51f1a799f3 Removal of axiom names from the theorem cache
paulson
parents: 22360
diff changeset
   559
      in  (cnf_axiom th :: ts,es) handle  _ => (ts, (th::es))  end;
15347
14585bc8fa09 resolution package tools by Jia Meng
paulson
parents:
diff changeset
   560
19894
7c7e15b27145 the "all_theorems" option and some fixes
paulson
parents: 19630
diff changeset
   561
fun pair_name_cls k (n, []) = []
7c7e15b27145 the "all_theorems" option and some fixes
paulson
parents: 19630
diff changeset
   562
  | pair_name_cls k (n, cls::clss) = (cls, (n,k)) :: pair_name_cls (k+1) (n, clss)
20461
d689ad772b2c skolem_cache_thm: Drule.close_derivation on clauses preserves some space;
wenzelm
parents: 20457
diff changeset
   563
19894
7c7e15b27145 the "all_theorems" option and some fixes
paulson
parents: 19630
diff changeset
   564
fun cnf_rules_pairs_aux pairs [] = pairs
7c7e15b27145 the "all_theorems" option and some fixes
paulson
parents: 19630
diff changeset
   565
  | cnf_rules_pairs_aux pairs ((name,th)::ths) =
22471
7c51f1a799f3 Removal of axiom names from the theorem cache
paulson
parents: 22360
diff changeset
   566
      let val pairs' = (pair_name_cls 0 (name, cnf_axiom th)) @ pairs
20461
d689ad772b2c skolem_cache_thm: Drule.close_derivation on clauses preserves some space;
wenzelm
parents: 20457
diff changeset
   567
                       handle THM _ => pairs | ResClause.CLAUSE _ => pairs
19894
7c7e15b27145 the "all_theorems" option and some fixes
paulson
parents: 19630
diff changeset
   568
      in  cnf_rules_pairs_aux pairs' ths  end;
20461
d689ad772b2c skolem_cache_thm: Drule.close_derivation on clauses preserves some space;
wenzelm
parents: 20457
diff changeset
   569
21290
33b6bb5d6ab8 Improvement to classrel clauses: now outputs the minimum needed.
paulson
parents: 21254
diff changeset
   570
(*The combination of rev and tail recursion preserves the original order*)
33b6bb5d6ab8 Improvement to classrel clauses: now outputs the minimum needed.
paulson
parents: 21254
diff changeset
   571
fun cnf_rules_pairs l = cnf_rules_pairs_aux [] (rev l);
19353
36b6b15ee670 added another function for CNF.
mengj
parents: 19232
diff changeset
   572
19196
62ee8c10d796 Added functions to retrieve local and global atpset rules.
mengj
parents: 19175
diff changeset
   573
18198
95330fc0ea8d -- combined common CNF functions used by HOL and FOL axioms, the difference between conversion of HOL and FOL theorems only comes in when theorems are converted to ResClause.clause or ResHolClause.clause format.
mengj
parents: 18144
diff changeset
   574
(**** Convert all theorems of a claset/simpset into clauses (ResClause.clause, or ResHolClause.clause) ****)
15347
14585bc8fa09 resolution package tools by Jia Meng
paulson
parents:
diff changeset
   575
20419
df257a9cf0e9 abstraction of lambda-expressions
paulson
parents: 20373
diff changeset
   576
(*Setup function: takes a theory and installs ALL known theorems into the clause cache*)
20457
85414caac94a refinements to conversion into clause form, esp for the HO case
paulson
parents: 20445
diff changeset
   577
22516
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   578
fun skolem_cache clause_cache th thy = #2 (skolem_cache_thm clause_cache th thy);
20457
85414caac94a refinements to conversion into clause form, esp for the HO case
paulson
parents: 20445
diff changeset
   579
22516
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   580
(*The cache can be kept smaller by inspecting the prop of each thm. Can ignore all that are
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   581
  lambda_free, but then the individual theory caches become much bigger.*)
21071
8d0245c5ed9e Fixed the "exception Empty" bug in elim2Fol
paulson
parents: 20996
diff changeset
   582
22516
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   583
fun clause_cache_setup thy = 
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   584
  fold (skolem_cache global_clause_cache) (map #2 (PureThy.all_thms_of thy)) thy;
20461
d689ad772b2c skolem_cache_thm: Drule.close_derivation on clauses preserves some space;
wenzelm
parents: 20457
diff changeset
   585
16563
a92f96951355 meson method taking an argument list
paulson
parents: 16173
diff changeset
   586
a92f96951355 meson method taking an argument list
paulson
parents: 16173
diff changeset
   587
(*** meson proof methods ***)
a92f96951355 meson method taking an argument list
paulson
parents: 16173
diff changeset
   588
22516
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   589
fun cnf_rules_of_ths ths = List.concat (map cnf_axiom ths);
16563
a92f96951355 meson method taking an argument list
paulson
parents: 16173
diff changeset
   590
21588
cd0dc678a205 simplified method setup;
wenzelm
parents: 21505
diff changeset
   591
val meson_method_setup = Method.add_methods
cd0dc678a205 simplified method setup;
wenzelm
parents: 21505
diff changeset
   592
  [("meson", Method.thms_args (fn ths =>
cd0dc678a205 simplified method setup;
wenzelm
parents: 21505
diff changeset
   593
      Method.SIMPLE_METHOD' (CHANGED_PROP o Meson.meson_claset_tac (cnf_rules_of_ths ths) HOL_cs)),
cd0dc678a205 simplified method setup;
wenzelm
parents: 21505
diff changeset
   594
    "MESON resolution proof procedure")];
15347
14585bc8fa09 resolution package tools by Jia Meng
paulson
parents:
diff changeset
   595
21102
7f2ebe5c5b72 Conversion to clause form now tolerates Boolean variables without looping.
paulson
parents: 21096
diff changeset
   596
(** Attribute for converting a theorem into clauses **)
18510
0a6c24f549c3 the "skolem" attribute and better initialization of the clause database
paulson
parents: 18404
diff changeset
   597
22471
7c51f1a799f3 Removal of axiom names from the theorem cache
paulson
parents: 22360
diff changeset
   598
fun meta_cnf_axiom th = map Meson.make_meta_clause (cnf_axiom th);
18510
0a6c24f549c3 the "skolem" attribute and better initialization of the clause database
paulson
parents: 18404
diff changeset
   599
21102
7f2ebe5c5b72 Conversion to clause form now tolerates Boolean variables without looping.
paulson
parents: 21096
diff changeset
   600
fun clausify_rule (th,i) = List.nth (meta_cnf_axiom th, i)
7f2ebe5c5b72 Conversion to clause form now tolerates Boolean variables without looping.
paulson
parents: 21096
diff changeset
   601
7f2ebe5c5b72 Conversion to clause form now tolerates Boolean variables without looping.
paulson
parents: 21096
diff changeset
   602
val clausify = Attrib.syntax (Scan.lift Args.nat
7f2ebe5c5b72 Conversion to clause form now tolerates Boolean variables without looping.
paulson
parents: 21096
diff changeset
   603
  >> (fn i => Thm.rule_attribute (fn _ => fn th => clausify_rule (th, i))));
7f2ebe5c5b72 Conversion to clause form now tolerates Boolean variables without looping.
paulson
parents: 21096
diff changeset
   604
21999
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   605
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   606
(*** Converting a subgoal into negated conjecture clauses. ***)
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   607
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   608
val neg_skolemize_tac = EVERY' [rtac ccontr, ObjectLogic.atomize_tac, skolemize_tac];
22471
7c51f1a799f3 Removal of axiom names from the theorem cache
paulson
parents: 22360
diff changeset
   609
7c51f1a799f3 Removal of axiom names from the theorem cache
paulson
parents: 22360
diff changeset
   610
(*finish_cnf removes tautologies and functional reflexivity axioms, but by calling Thm.varifyT
22644
f10465ee7aa2 Fixed the treatment of TVars in conjecture clauses (they are deleted, not frozen)
paulson
parents: 22596
diff changeset
   611
  it can introduce TVars, which are useless in conjecture clauses.*)
f10465ee7aa2 Fixed the treatment of TVars in conjecture clauses (they are deleted, not frozen)
paulson
parents: 22596
diff changeset
   612
val no_tvars = null o term_tvars o prop_of;
f10465ee7aa2 Fixed the treatment of TVars in conjecture clauses (they are deleted, not frozen)
paulson
parents: 22596
diff changeset
   613
f10465ee7aa2 Fixed the treatment of TVars in conjecture clauses (they are deleted, not frozen)
paulson
parents: 22596
diff changeset
   614
val neg_clausify = filter no_tvars o Meson.finish_cnf o assume_abstract_list o make_clauses;
21999
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   615
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   616
fun neg_conjecture_clauses st0 n =
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   617
  let val st = Seq.hd (neg_skolemize_tac n st0)
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   618
      val (params,_,_) = strip_context (Logic.nth_prem (n, Thm.prop_of st))
22516
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   619
  in (neg_clausify (Option.valOf (metahyps_thms n st)), params) end
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   620
  handle Option => raise ERROR "unable to Skolemize subgoal";
21999
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   621
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   622
(*Conversion of a subgoal to conjecture clauses. Each clause has  
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   623
  leading !!-bound universal variables, to express generality. *)
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   624
val neg_clausify_tac = 
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   625
  neg_skolemize_tac THEN' 
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   626
  SUBGOAL
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   627
    (fn (prop,_) =>
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   628
     let val ts = Logic.strip_assums_hyp prop
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   629
     in EVERY1 
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   630
	 [METAHYPS
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   631
	    (fn hyps => 
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   632
              (Method.insert_tac
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   633
                (map forall_intr_vars (neg_clausify hyps)) 1)),
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   634
	  REPEAT_DETERM_N (length ts) o (etac thin_rl)]
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   635
     end);
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   636
21102
7f2ebe5c5b72 Conversion to clause form now tolerates Boolean variables without looping.
paulson
parents: 21096
diff changeset
   637
(** The Skolemization attribute **)
18510
0a6c24f549c3 the "skolem" attribute and better initialization of the clause database
paulson
parents: 18404
diff changeset
   638
0a6c24f549c3 the "skolem" attribute and better initialization of the clause database
paulson
parents: 18404
diff changeset
   639
fun conj2_rule (th1,th2) = conjI OF [th1,th2];
0a6c24f549c3 the "skolem" attribute and better initialization of the clause database
paulson
parents: 18404
diff changeset
   640
20457
85414caac94a refinements to conversion into clause form, esp for the HO case
paulson
parents: 20445
diff changeset
   641
(*Conjoin a list of theorems to form a single theorem*)
85414caac94a refinements to conversion into clause form, esp for the HO case
paulson
parents: 20445
diff changeset
   642
fun conj_rule []  = TrueI
20445
b222d9939e00 improvements to abstraction generation
paulson
parents: 20421
diff changeset
   643
  | conj_rule ths = foldr1 conj2_rule ths;
18510
0a6c24f549c3 the "skolem" attribute and better initialization of the clause database
paulson
parents: 18404
diff changeset
   644
20419
df257a9cf0e9 abstraction of lambda-expressions
paulson
parents: 20373
diff changeset
   645
fun skolem_attr (Context.Theory thy, th) =
22516
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   646
      let val (cls, thy') = skolem_cache_thm (ThmCache.get thy) th thy
18728
6790126ab5f6 simplified type attribute;
wenzelm
parents: 18708
diff changeset
   647
      in (Context.Theory thy', conj_rule cls) end
22516
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   648
  | skolem_attr (context, th) = (context, conj_rule (cnf_axiom th));
18510
0a6c24f549c3 the "skolem" attribute and better initialization of the clause database
paulson
parents: 18404
diff changeset
   649
0a6c24f549c3 the "skolem" attribute and better initialization of the clause database
paulson
parents: 18404
diff changeset
   650
val setup_attrs = Attrib.add_attributes
21102
7f2ebe5c5b72 Conversion to clause form now tolerates Boolean variables without looping.
paulson
parents: 21096
diff changeset
   651
  [("skolem", Attrib.no_args skolem_attr, "skolemization of a theorem"),
21999
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   652
   ("clausify", clausify, "conversion of theorem to clauses")];
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   653
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   654
val setup_methods = Method.add_methods
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   655
  [("neg_clausify", Method.no_args (Method.SIMPLE_METHOD' neg_clausify_tac), 
0cf192e489e2 improvements to proof reconstruction. Some files loaded in a different order
paulson
parents: 21900
diff changeset
   656
    "conversion of goal to conjecture clauses")];
21102
7f2ebe5c5b72 Conversion to clause form now tolerates Boolean variables without looping.
paulson
parents: 21096
diff changeset
   657
     
22516
c986140356b8 Clause cache is now in theory data.
paulson
parents: 22471
diff changeset
   658
val setup = clause_cache_setup #> ThmCache.init #> setup_attrs #> setup_methods;
18510
0a6c24f549c3 the "skolem" attribute and better initialization of the clause database
paulson
parents: 18404
diff changeset
   659
20461
d689ad772b2c skolem_cache_thm: Drule.close_derivation on clauses preserves some space;
wenzelm
parents: 20457
diff changeset
   660
end;