1.1 --- a/src/HOL/Codatatype/BNF_FP.thy Mon Sep 17 21:13:30 2012 +0200
1.2 +++ b/src/HOL/Codatatype/BNF_FP.thy Mon Sep 17 21:13:30 2012 +0200
1.3 @@ -123,14 +123,17 @@
1.4 "\<exists>y. (\<exists>x\<in>A. y = F x) \<and> z \<in> y \<Longrightarrow> z \<in> \<Union>{y. \<exists>x\<in>A. y = {y. \<exists>y'\<in>F x. y = y'}}"
1.5 by blast
1.6
1.7 -lemma induct_set_step: "\<lbrakk>B \<in> A; c \<in> f B\<rbrakk> \<Longrightarrow> \<exists>C. (\<exists>a \<in> A. C = f a) \<and> c \<in> C"
1.8 -apply (rule exI)
1.9 -apply (rule conjI)
1.10 - apply (rule bexI)
1.11 - apply (rule refl)
1.12 - apply assumption
1.13 -apply assumption
1.14 -done
1.15 +lemma mem_compreh_eq_iff:
1.16 +"z \<in> {y. \<exists>x\<in>Axx. y = f x} = (\<exists> x. x \<in> Axx & z \<in> {f x})"
1.17 +by blast
1.18 +
1.19 +lemma ex_mem_singleton: "(\<exists>y. y \<in> A \<and> y \<in> {x}) = (x \<in> A)"
1.20 +by simp
1.21 +
1.22 +lemma induct_set_step:
1.23 +"\<lbrakk>b \<in> A; c \<in> F b\<rbrakk> \<Longrightarrow> \<exists>x. x \<in> A \<and> c \<in> F x"
1.24 +"\<lbrakk>B \<in> A; c \<in> f B\<rbrakk> \<Longrightarrow> \<exists>C. (\<exists>a \<in> A. C = f a) \<and>c \<in> C"
1.25 +by blast+
1.26
1.27 ML_file "Tools/bnf_fp_util.ML"
1.28 ML_file "Tools/bnf_fp_sugar_tactics.ML"
2.1 --- a/src/HOL/Codatatype/Tools/bnf_fp_sugar.ML Mon Sep 17 21:13:30 2012 +0200
2.2 +++ b/src/HOL/Codatatype/Tools/bnf_fp_sugar.ML Mon Sep 17 21:13:30 2012 +0200
2.3 @@ -602,6 +602,7 @@
2.4 end;
2.5
2.6 val ppjjqqkksss = map (map (mk_raw_prem_prems_indices o #2)) raw_premss;
2.7 +val _ = tracing ("val ppjjqqkksss = " ^ PolyML.makestring ppjjqqkksss) (*###*)
2.8
2.9 val fld_induct' = fp_induct OF (map mk_sumEN_tupled_balanced mss);
2.10
3.1 --- a/src/HOL/Codatatype/Tools/bnf_fp_sugar_tactics.ML Mon Sep 17 21:13:30 2012 +0200
3.2 +++ b/src/HOL/Codatatype/Tools/bnf_fp_sugar_tactics.ML Mon Sep 17 21:13:30 2012 +0200
3.3 @@ -43,6 +43,52 @@
3.4
3.5 val inst_spurious_fs_tac = PRIMITIVE o inst_spurious_fs;
3.6
3.7 +fun mk_set_rhs set_lhs T =
3.8 + let
3.9 + val Type (_, Ts0) = domain_type (fastype_of set_lhs);
3.10 + val Type (_, Ts) = domain_type T;
3.11 + in
3.12 + Term.subst_atomic_types (Ts0 ~~ Ts) set_lhs
3.13 + end;
3.14 +
3.15 +val mk_fsts_rhs = mk_set_rhs (snd (Logic.dest_equals (prop_of @{thm fsts_def[abs_def]})));
3.16 +val mk_snds_rhs = mk_set_rhs (snd (Logic.dest_equals (prop_of @{thm snds_def[abs_def]})));
3.17 +val mk_setl_rhs = mk_set_rhs (snd (Logic.dest_equals (prop_of @{thm sum_setl_def[abs_def]})));
3.18 +val mk_setr_rhs = mk_set_rhs (snd (Logic.dest_equals (prop_of @{thm sum_setr_def[abs_def]})));
3.19 +
3.20 +(* TODO: Put this in "Balanced_Tree" *)
3.21 +fun balanced_tree_middle n = n div 2;
3.22 +
3.23 +val sum_prod_sel_defs =
3.24 + @{thms fsts_def[abs_def] snds_def[abs_def] sum_setl_def[abs_def] sum_setr_def[abs_def]};
3.25 +
3.26 +fun unfold_sum_prod_sets ctxt ms thm =
3.27 + let
3.28 + fun unf_prod 0 f = f
3.29 + | unf_prod 1 f = f
3.30 + | unf_prod m (t1 $ (t2 $ (t3 $ (t4 $ Const (_, T1) $ (t5 $ Const (_, T2) $ t6))))
3.31 + $ (t7 $ f $ g)) =
3.32 + t1 $ (t2 $ (t3 $ (t4 $ mk_fsts_rhs T1 $ (t5 $ mk_snds_rhs T2 $ t6))))
3.33 + $ (t7 $ f $ unf_prod (m - 1) g)
3.34 + | unf_prod _ f = f;
3.35 + fun unf_sum [m] f = unf_prod m f
3.36 + | unf_sum ms (t1 $ (t2 $ (t3 $ (t4 $ Const (_, T1) $ (t5 $ Const (_, T2) $ t6))))
3.37 + $ (t7 $ f $ g)) =
3.38 + let val (ms1, ms2) = chop (balanced_tree_middle (length ms)) ms in
3.39 + t1 $ (t2 $ (t3 $ (t4 $ mk_setl_rhs T1 $ (t5 $ mk_setr_rhs T2 $ t6))))
3.40 + $ (t7 $ unf_sum ms1 f $ unf_sum ms2 g)
3.41 + end
3.42 + | unf_sum _ f = f;
3.43 +
3.44 + val P = prop_of thm;
3.45 + val P' = Logic.dest_equals P ||> unf_sum ms;
3.46 + val goal = Logic.mk_implies (P, Logic.mk_equals P');
3.47 + in
3.48 + Skip_Proof.prove ctxt [] [] goal (fn {context = ctxt, ...} =>
3.49 + Local_Defs.unfold_tac ctxt sum_prod_sel_defs THEN atac 1)
3.50 + OF [thm]
3.51 + end;
3.52 +
3.53 fun mk_case_tac ctxt n k m case_def ctr_def unf_fld =
3.54 Local_Defs.unfold_tac ctxt [case_def, ctr_def, unf_fld] THEN
3.55 (rtac (mk_sum_casesN_balanced n k RS ssubst) THEN'
3.56 @@ -88,14 +134,14 @@
3.57 Local_Defs.unfold_tac ctxt @{thms id_def} THEN
3.58 TRY ((rtac refl ORELSE' subst_tac ctxt @{thms unit_eq} THEN' rtac refl) 1);
3.59
3.60 -(* TODO: Get rid of "auto_tac" (or at least use a naked context) *)
3.61 +val maybe_singletonI_tac = atac ORELSE' rtac @{thm singletonI};
3.62
3.63 -fun mk_induct_prem_prem_endgame_tac _ 0 = atac ORELSE' rtac @{thm singletonI}
3.64 +fun mk_induct_prem_prem_endgame_tac _ 0 = maybe_singletonI_tac
3.65 | mk_induct_prem_prem_endgame_tac ctxt qq =
3.66 REPEAT_DETERM_N qq o
3.67 - (SELECT_GOAL (Local_Defs.unfold_tac ctxt @{thms Union_iff bex_simps(6)}) THEN'
3.68 - etac @{thm induct_set_step}) THEN'
3.69 - atac ORELSE' SELECT_GOAL (auto_tac ctxt);
3.70 + (SELECT_GOAL (Local_Defs.unfold_tac ctxt
3.71 + @{thms trans[OF Union_iff bex_simps(6)] mem_compreh_eq_iff ex_mem_singleton}) THEN'
3.72 + eresolve_tac @{thms induct_set_step}) THEN' maybe_singletonI_tac;
3.73
3.74 fun gen_UN_comprehI_tac UnI = REPEAT_DETERM o resolve_tac @{thms mem_UN_comprehI} THEN' rtac UnI;
3.75
3.76 @@ -109,19 +155,12 @@
3.77 image_def o_apply snd_conv snd_prod_fun sum.cases sup_bot_right fst_map_pair map_pair_simp
3.78 sum_map.simps};
3.79
3.80 -(* These rules interfere with the "set_natural'" properties of "sum" and "prod", so we explicitly
3.81 - delay them. *)
3.82 -val induct_prem_prem_thms_delayed =
3.83 - @{thms fsts_def[abs_def] snds_def[abs_def] sum_setl_def[abs_def] sum_setr_def[abs_def]};
3.84 -
3.85 fun mk_induct_leverage_prem_prems_tac ctxt nn ppjjqqkks set_natural's pre_set_defs =
3.86 EVERY' (maps (fn ((pp, jj), (qq, kk)) =>
3.87 [select_prem_tac nn (dtac meta_spec) kk, etac meta_mp,
3.88 SELECT_GOAL (Local_Defs.unfold_tac ctxt
3.89 (pre_set_defs @ set_natural's @ induct_prem_prem_thms)),
3.90 - SELECT_GOAL (Local_Defs.unfold_tac ctxt
3.91 - (induct_prem_prem_thms_delayed @ induct_prem_prem_thms)),
3.92 - gen_UnIN_tac pp jj THEN' mk_induct_prem_prem_endgame_tac ctxt qq]) (rev ppjjqqkks)) 1;
3.93 + gen_UnIN_tac pp jj, mk_induct_prem_prem_endgame_tac ctxt qq]) (rev ppjjqqkks)) 1;
3.94
3.95 fun mk_induct_discharge_prem_tac ctxt nn n set_natural's pre_set_defs m k ppjjqqkks =
3.96 let val r = length ppjjqqkks in
3.97 @@ -137,10 +176,11 @@
3.98 let
3.99 val nn = length ns;
3.100 val n = Integer.sum ns;
3.101 + val pre_set_defss' = map2 (map o unfold_sum_prod_sets ctxt) mss pre_set_defss;
3.102 in
3.103 Local_Defs.unfold_tac ctxt ctr_defs THEN rtac fld_induct' 1 THEN inst_spurious_fs_tac ctxt THEN
3.104 EVERY (map4 (EVERY oooo map3 o mk_induct_discharge_prem_tac ctxt nn n set_natural's)
3.105 - pre_set_defss mss (unflat mss (1 upto n)) ppjjqqkksss)
3.106 + pre_set_defss' mss (unflat mss (1 upto n)) ppjjqqkksss)
3.107 end;
3.108
3.109 end;