(* Title: HOL/Tools/BNF/bnf_fp_util_tactics.ML
Author: Dmitriy Traytel, ETH Zürich
Copyright 2016
Common tactics for datatype and codatatype constructions.
*)
signature BNF_FP_UTIL_TACTICS =
sig
val mk_xtor_co_rec_id_tac: Proof.context -> thm list -> thm -> thm list -> thm list -> tactic
val mk_xtor_co_rec_tac: Proof.context -> thm -> thm list -> thm list -> tactic
val mk_xtor_co_rec_unique_tac: Proof.context -> BNF_Util.fp_kind -> thm list -> thm list -> thm ->
thm list -> thm list -> tactic
val mk_xtor_co_rec_transfer_tac: Proof.context -> BNF_Util.fp_kind -> int -> int -> thm list ->
thm list -> thm list -> thm list -> tactic
end
structure BNF_FP_Util_Tactics =
struct
open BNF_Tactics
open BNF_Util
fun mk_xtor_co_rec_id_tac ctxt xtor_un_fold_xtors xtor_un_fold_unique xtor_un_folds map_comps =
unfold_thms_tac ctxt (map mk_sym xtor_un_fold_xtors) THEN
HEADGOAL (rtac ctxt xtor_un_fold_unique THEN_ALL_NEW EVERY' [rtac ctxt ext,
SELECT_GOAL (unfold_thms_tac ctxt
(o_apply :: @{thms fst_convol' id_o sum.case} @ map_comps @ xtor_un_folds)),
rtac ctxt refl]);
fun mk_xtor_co_rec_tac ctxt un_fold co_rec_defs co_rec_expand_thms =
unfold_thms_tac ctxt (un_fold ::
@{thms o_apply sum.case snd_convol' case_sum_o_inj(2)} @ co_rec_defs @ co_rec_expand_thms) THEN
HEADGOAL (rtac ctxt refl);
fun mk_xtor_co_rec_unique_tac ctxt fp co_rec_defs co_rec_expand's un_fold_unique map_ids map_comps =
unfold_thms_tac ctxt (co_rec_defs @ co_rec_expand's) THEN
HEADGOAL (EVERY' [rtac ctxt un_fold_unique]) THEN
unfold_thms_tac ctxt (map_ids @ map_comps @ case_fp fp
@{thms id_o o_id convol_o fst_convol o_assoc[symmetric]}
@{thms id_o o_id o_case_sum case_sum_o_inj(1) o_assoc}) THEN
ALLGOALS (etac ctxt (case_fp fp
@{thm arg_cong2[of _ _ _ _ BNF_Def.convol, OF refl]}
@{thm arg_cong2[of _ _ _ _ case_sum, OF refl]}));
fun mk_xtor_co_rec_transfer_tac ctxt fp n m defs un_fold_transfers pre_T_map_transfers xtor_rels =
case_fp fp
(CONJ_WRAP (fn (def, un_fold_transfer) =>
REPEAT_DETERM (HEADGOAL (rtac ctxt rel_funI)) THEN
unfold_thms_tac ctxt [def, o_apply] THEN
HEADGOAL (rtac ctxt @{thm rel_funD[OF snd_transfer]} THEN'
etac ctxt (mk_rel_funDN_rotated (n + 1) un_fold_transfer) THEN'
EVERY' (map2 (fn pre_T_map_transfer => fn xtor_rel =>
etac ctxt (mk_rel_funDN_rotated 2 @{thm convol_transfer}) THEN'
rtac ctxt (mk_rel_funDN_rotated 2 @{thm comp_transfer}) THEN'
rtac ctxt (mk_rel_funDN (m + n) pre_T_map_transfer) THEN'
REPEAT_DETERM_N m o rtac ctxt @{thm id_transfer} THEN'
REPEAT_DETERM o rtac ctxt @{thm fst_transfer} THEN'
rtac ctxt rel_funI THEN'
etac ctxt (xtor_rel RS iffD2)) pre_T_map_transfers xtor_rels)))
(defs ~~ un_fold_transfers))
(CONJ_WRAP (fn (def, un_fold_transfer) =>
REPEAT_DETERM (HEADGOAL (rtac ctxt rel_funI)) THEN
unfold_thms_tac ctxt [def, o_apply] THEN
HEADGOAL (rtac ctxt (mk_rel_funDN (n + 1) un_fold_transfer) THEN'
EVERY' (map2 (fn pre_T_map_transfer => fn xtor_rel =>
etac ctxt (mk_rel_funDN_rotated 2 @{thm case_sum_transfer}) THEN'
rtac ctxt (mk_rel_funDN 2 @{thm comp_transfer}) THEN'
rtac ctxt (mk_rel_funDN (m + n) pre_T_map_transfer) THEN'
REPEAT_DETERM_N m o rtac ctxt @{thm id_transfer} THEN'
REPEAT_DETERM_N n o rtac ctxt @{thm Inl_transfer} THEN'
rtac ctxt rel_funI THEN'
etac ctxt (xtor_rel RS iffD1)) pre_T_map_transfers xtor_rels) THEN'
etac ctxt (mk_rel_funDN 1 @{thm Inr_transfer})))
(defs ~~ un_fold_transfers));
end