--- a/src/HOL/Tools/ComputeHOL.thy Mon Jul 09 22:06:49 2007 +0200
+++ b/src/HOL/Tools/ComputeHOL.thy Mon Jul 09 22:37:48 2007 +0200
@@ -138,4 +138,59 @@
lemmas compute_hol = compute_if compute_bool compute_pair compute_option compute_list compute_let
+ML {*
+signature ComputeHOL =
+sig
+ val prep_thms : thm list -> thm list
+ val to_meta_eq : thm -> thm
+ val to_hol_eq : thm -> thm
+ val symmetric : thm -> thm
+ val trans : thm -> thm -> thm
end
+
+structure ComputeHOL : ComputeHOL =
+struct
+
+local
+fun lhs_of eq = fst (Thm.dest_equals (cprop_of eq));
+in
+fun rewrite_conv [] ct = raise CTERM ("rewrite_conv", [])
+ | rewrite_conv (eq :: eqs) ct =
+ Thm.instantiate (Thm.match (lhs_of eq, ct)) eq
+ handle Pattern.MATCH => rewrite_conv eqs ct;
+end
+
+val convert_conditions = Conv.fconv_rule (Conv.prems_conv ~1 (Conv.try_conv (rewrite_conv [@{thm "Trueprop_eq_eq"}])))
+
+val eq_th = @{thm "HOL.eq_reflection"}
+val meta_eq_trivial = @{thm "ComputeHOL.meta_eq_trivial"}
+val bool_to_true = @{thm "ComputeHOL.bool_to_true"}
+
+fun to_meta_eq th = eq_th OF [th] handle THM _ => meta_eq_trivial OF [th] handle THM _ => bool_to_true OF [th]
+
+fun to_hol_eq th = @{thm "meta_eq_imp_eq"} OF [th] handle THM _ => @{thm "eq_trivial"} OF [th]
+
+fun prep_thms ths = map (convert_conditions o to_meta_eq) ths
+
+local
+ val sym_HOL = @{thm "HOL.sym"}
+ val sym_Pure = @{thm "ProtoPure.symmetric"}
+in
+ fun symmetric th = ((sym_HOL OF [th]) handle THM _ => (sym_Pure OF [th]))
+end
+
+local
+ val trans_HOL = @{thm "HOL.trans"}
+ val trans_HOL_1 = @{thm "ComputeHOL.transmeta_1"}
+ val trans_HOL_2 = @{thm "ComputeHOL.transmeta_2"}
+ val trans_HOL_3 = @{thm "ComputeHOL.transmeta_3"}
+ fun tr [] th1 th2 = trans_HOL OF [th1, th2]
+ | tr (t::ts) th1 th2 = (t OF [th1, th2] handle THM _ => tr ts th1 th2)
+in
+ fun trans th1 th2 = tr [trans_HOL, trans_HOL_1, trans_HOL_2, trans_HOL_3] th1 th2
+end
+
+end
+*}
+
+end