1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/HOL/Codatatype/Tools/bnf_fp_sugar_tactics.ML	Tue Sep 04 13:06:41 2012 +0200
     1.3 @@ -0,0 +1,26 @@
     1.4 +(*  Title:      HOL/Codatatype/Tools/bnf_fp_sugar_tactics.ML
     1.5 +    Author:     Jasmin Blanchette, TU Muenchen
     1.6 +    Copyright   2012
     1.7 +
     1.8 +Tactics for the LFP/GFP sugar.
     1.9 +*)
    1.10 +
    1.11 +signature BNF_FP_SUGAR_TACTICS =
    1.12 +sig
    1.13 +  val mk_fld_iff_unf_tac: Proof.context -> ctyp option list -> cterm -> cterm -> thm -> thm
    1.14 +    -> tactic
    1.15 +end;
    1.16 +
    1.17 +structure BNF_FP_Sugar_Tactics : BNF_FP_SUGAR_TACTICS =
    1.18 +struct
    1.19 +
    1.20 +open BNF_Util
    1.21 +
    1.22 +fun mk_fld_iff_unf_tac ctxt cTs cfld cunf fld_unf unf_fld =
    1.23 +  (rtac iffI THEN'
    1.24 +   EVERY' (map3 (fn cTs => fn cx => fn th =>
    1.25 +     dtac (Drule.instantiate' cTs [NONE, NONE, SOME cx] arg_cong) THEN'
    1.26 +     SELECT_GOAL (Local_Defs.unfold_tac ctxt [th]) THEN'
    1.27 +     atac) [rev cTs, cTs] [cunf, cfld] [unf_fld, fld_unf])) 1;
    1.28 +
    1.29 +end;