author | blanchet |
Thu, 02 Jan 2014 20:10:08 +0100 | |
changeset 54915 | 61284fe0536a |
parent 54910 | 0ec2cccbf8ad |
child 54916 | aa891e065af1 |
permissions | -rw-r--r-- |
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(* Title: HOL/BNF/Tools/bnf_gfp_rec_sugar_tactics.ML |
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Author: Jasmin Blanchette, TU Muenchen |
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Copyright 2013 |
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Tactics for corecursor sugar. |
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*) |
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signature BNF_GFP_REC_SUGAR_TACTICS = |
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sig |
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val mk_primcorec_assumption_tac: Proof.context -> thm list -> int -> tactic |
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val mk_primcorec_code_of_raw_code_tac: Proof.context -> thm list -> thm list -> thm -> tactic |
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val mk_primcorec_ctr_of_dtr_tac: Proof.context -> int -> thm -> thm option -> thm list -> tactic |
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val mk_primcorec_disc_tac: Proof.context -> thm list -> thm -> int -> int -> thm list list list -> |
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tactic |
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val mk_primcorec_disc_iff_tac: Proof.context -> thm -> thm -> thm list -> thm list -> tactic |
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val mk_primcorec_exhaust_tac: int -> thm -> tactic |
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val mk_primcorec_raw_code_of_ctr_tac: Proof.context -> thm list -> thm list -> thm list -> |
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thm list -> int list -> thm list -> thm option -> tactic |
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val mk_primcorec_sel_tac: Proof.context -> thm list -> thm list -> thm list -> thm list -> |
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thm list -> thm list -> thm -> int -> int -> thm list list list -> tactic |
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end; |
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|
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structure BNF_GFP_Rec_Sugar_Tactics : BNF_GFP_REC_SUGAR_TACTICS = |
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struct |
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open BNF_Util |
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open BNF_Tactics |
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val atomize_conjL = @{thm atomize_conjL}; |
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val falseEs = @{thms not_TrueE FalseE}; |
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val Let_def = @{thm Let_def}; |
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val neq_eq_eq_contradict = @{thm neq_eq_eq_contradict}; |
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val split_if = @{thm split_if}; |
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val split_if_asm = @{thm split_if_asm}; |
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val split_connectI = @{thms allI impI conjI}; |
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fun mk_primcorec_exhaust_tac n nchotomy = |
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let val ks = 1 upto n in |
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HEADGOAL (atac ORELSE' |
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cut_tac nchotomy THEN' |
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EVERY' (map (fn k => |
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(if k < n then etac disjE else K all_tac) THEN' |
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REPEAT o (etac conjE THEN' dtac meta_mp THEN' atac) THEN' |
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dtac meta_mp THEN' atac THEN' atac) |
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ks)) |
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end; |
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||
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fun mk_primcorec_assumption_tac ctxt discIs = |
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SELECT_GOAL (unfold_thms_tac ctxt |
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@{thms not_not not_False_eq_True not_True_eq_False de_Morgan_conj de_Morgan_disj} THEN |
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SOLVE (HEADGOAL (REPEAT o (rtac refl ORELSE' atac ORELSE' etac conjE ORELSE' |
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eresolve_tac falseEs ORELSE' |
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resolve_tac @{thms TrueI conjI disjI1 disjI2} ORELSE' |
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dresolve_tac discIs THEN' atac ORELSE' |
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etac notE THEN' atac ORELSE' |
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etac disjE)))); |
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fun mk_primcorec_same_case_tac m = |
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HEADGOAL (if m = 0 then rtac TrueI |
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else REPEAT_DETERM_N (m - 1) o (rtac conjI THEN' atac) THEN' atac); |
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fun mk_primcorec_different_case_tac ctxt m excl = |
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HEADGOAL (if m = 0 then mk_primcorec_assumption_tac ctxt [] |
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else dtac excl THEN' (REPEAT_DETERM_N (m - 1) o atac) THEN' mk_primcorec_assumption_tac ctxt []); |
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fun mk_primcorec_cases_tac ctxt k m exclsss = |
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let val n = length exclsss in |
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EVERY (map (fn [] => if k = n then all_tac else mk_primcorec_same_case_tac m |
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| [excl] => mk_primcorec_different_case_tac ctxt m excl) |
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(take k (nth exclsss (k - 1)))) |
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end; |
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fun mk_primcorec_prelude ctxt defs thm = |
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unfold_thms_tac ctxt defs THEN HEADGOAL (rtac thm) THEN |
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unfold_thms_tac ctxt @{thms Let_def split}; |
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fun mk_primcorec_disc_tac ctxt defs disc_corec k m exclsss = |
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mk_primcorec_prelude ctxt defs disc_corec THEN mk_primcorec_cases_tac ctxt k m exclsss; |
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fun disc_same_tac i st = (atac ORELSE' rtac TrueI ORELSE' etac conjI THEN' disc_same_tac) i st; |
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fun mk_primcorec_disc_iff_tac ctxt fun_exhaust fun_disc fun_discs disc_excludes = |
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HEADGOAL (rtac iffI THEN' |
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rtac fun_exhaust THEN' |
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EVERY' (map (fn fun_disc' => |
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if Thm.eq_thm (fun_disc', fun_disc) then |
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disc_same_tac |
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else |
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dtac fun_disc' THEN' (REPEAT_DETERM o atac) THEN' |
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DETERM o (dresolve_tac disc_excludes THEN' etac notE THEN' atac)) |
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fun_discs) THEN' |
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rtac (unfold_thms ctxt [atomize_conjL] fun_disc) THEN_MAYBE' atac); |
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fun mk_primcorec_sel_tac ctxt defs distincts splits split_asms map_idents map_comps fun_sel k m |
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exclsss = |
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mk_primcorec_prelude ctxt defs (fun_sel RS trans) THEN |
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mk_primcorec_cases_tac ctxt k m exclsss THEN |
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strengthened tactic for right-hand sides involving lambdas
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HEADGOAL (REPEAT_DETERM o (rtac refl ORELSE' rtac ext ORELSE' |
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eresolve_tac falseEs ORELSE' |
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resolve_tac split_connectI ORELSE' |
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Splitter.split_asm_tac (split_if_asm :: split_asms) ORELSE' |
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Splitter.split_tac (split_if :: splits) ORELSE' |
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eresolve_tac (map (fn thm => thm RS neq_eq_eq_contradict) distincts) THEN' atac ORELSE' |
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etac notE THEN' atac ORELSE' |
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(CHANGED o SELECT_GOAL (unfold_thms_tac ctxt |
54900 | 106 |
(@{thms id_def o_def split_def sum.cases} @ map_comps @ map_idents))))); |
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fun mk_primcorec_ctr_of_dtr_tac ctxt m collapse maybe_disc_fun sel_funs = |
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HEADGOAL (rtac ((if null sel_funs then collapse else collapse RS sym) RS trans) THEN' |
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(the_default (K all_tac) (Option.map rtac maybe_disc_fun)) THEN' REPEAT_DETERM_N m o atac) THEN |
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unfold_thms_tac ctxt (Let_def :: sel_funs) THEN HEADGOAL (rtac refl); |
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fun inst_split_eq ctxt split = |
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(case prop_of split of |
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@{const Trueprop} $ (Const (@{const_name HOL.eq}, _) $ (Var (_, Type (_, [T, _])) $ _) $ _) => |
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let |
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val s = Name.uu; |
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val eq = Abs (Name.uu, T, HOLogic.mk_eq (Free (s, T), Bound 0)); |
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val split' = Drule.instantiate' [] [SOME (certify ctxt eq)] split; |
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in |
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Thm.generalize ([], [s]) (Thm.maxidx_of split' + 1) split' |
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end |
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| _ => split); |
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|
54174 | 125 |
fun distinct_in_prems_tac distincts = |
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eresolve_tac (map (fn thm => thm RS neq_eq_eq_contradict) distincts) THEN' atac; |
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127 |
||
54900 | 128 |
fun mk_primcorec_raw_code_of_ctr_single_tac ctxt distincts discIs splits split_asms m fun_ctr = |
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let |
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val splits' = |
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map (fn th => th RS iffD2) (@{thm split_if_eq2} :: map (inst_split_eq ctxt) splits) |
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in |
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HEADGOAL (REPEAT o (resolve_tac (splits' @ split_connectI))) THEN |
54900 | 134 |
mk_primcorec_prelude ctxt [] (fun_ctr RS trans) THEN |
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135 |
HEADGOAL ((REPEAT_DETERM_N m o mk_primcorec_assumption_tac ctxt discIs) THEN' |
c7119e1cde3e
avoid confusion between outer ifs and inner ifs, that caused tactic to go berserk
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136 |
SELECT_GOAL (SOLVE (HEADGOAL (REPEAT_DETERM o |
c7119e1cde3e
avoid confusion between outer ifs and inner ifs, that caused tactic to go berserk
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|
137 |
(rtac refl ORELSE' atac ORELSE' |
54174 | 138 |
resolve_tac (@{thm Code.abort_def} :: split_connectI) ORELSE' |
139 |
Splitter.split_tac (split_if :: splits) ORELSE' |
|
54138
c7119e1cde3e
avoid confusion between outer ifs and inner ifs, that caused tactic to go berserk
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140 |
Splitter.split_asm_tac (split_if_asm :: split_asms) ORELSE' |
c7119e1cde3e
avoid confusion between outer ifs and inner ifs, that caused tactic to go berserk
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141 |
mk_primcorec_assumption_tac ctxt discIs ORELSE' |
54174 | 142 |
distinct_in_prems_tac distincts ORELSE' |
54138
c7119e1cde3e
avoid confusion between outer ifs and inner ifs, that caused tactic to go berserk
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143 |
(TRY o dresolve_tac discIs) THEN' etac notE THEN' atac))))) |
c7119e1cde3e
avoid confusion between outer ifs and inner ifs, that caused tactic to go berserk
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|
144 |
end; |
53903 | 145 |
|
54842
a020f7d74fed
renamed 'exhaust' to 'nchotomy' since it's expressed in the object logic (cf. datatype package)
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146 |
fun rulify_nchotomy n = funpow (n - 1) (fn thm => thm RS @{thm Meson.make_pos_rule'}); |
54832 | 147 |
|
54900 | 148 |
fun mk_primcorec_raw_code_of_ctr_tac ctxt distincts discIs splits split_asms ms fun_ctrs |
54842
a020f7d74fed
renamed 'exhaust' to 'nchotomy' since it's expressed in the object logic (cf. datatype package)
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|
149 |
maybe_nchotomy = |
54832 | 150 |
let |
151 |
val n = length ms; |
|
54900 | 152 |
val (ms', fun_ctrs') = |
54842
a020f7d74fed
renamed 'exhaust' to 'nchotomy' since it's expressed in the object logic (cf. datatype package)
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153 |
(case maybe_nchotomy of |
54900 | 154 |
NONE => (ms, fun_ctrs) |
54842
a020f7d74fed
renamed 'exhaust' to 'nchotomy' since it's expressed in the object logic (cf. datatype package)
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|
155 |
| SOME nchotomy => |
54832 | 156 |
(ms |> split_last ||> K [n - 1] |> op @, |
54900 | 157 |
fun_ctrs |
54843
7f30d569da08
made tactic work with theorems with multiple assumptions
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|
158 |
|> split_last |
54899
7a01387c47d5
added tactic to prove 'disc_iff' properties in 'primcorec'
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|
159 |
||> unfold_thms ctxt [atomize_conjL] |
54908
f4ae538b0ba5
gracefully handle single-equation case, where 'nchotomy' is 'True'
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|
160 |
||> (fn thm => [rulify_nchotomy n nchotomy RS thm] handle THM _ => [thm]) |
54843
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made tactic work with theorems with multiple assumptions
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|
161 |
|> op @)); |
54832 | 162 |
in |
163 |
EVERY (map2 (mk_primcorec_raw_code_of_ctr_single_tac ctxt distincts discIs splits split_asms) |
|
54900 | 164 |
ms' fun_ctrs') THEN |
54832 | 165 |
IF_UNSOLVED (unfold_thms_tac ctxt @{thms Code.abort_def} THEN |
166 |
HEADGOAL (REPEAT_DETERM o resolve_tac (refl :: split_connectI))) |
|
167 |
end; |
|
53693 | 168 |
|
54174 | 169 |
fun mk_primcorec_code_of_raw_code_tac ctxt distincts splits raw = |
54101 | 170 |
HEADGOAL (rtac raw ORELSE' rtac (raw RS trans) THEN' |
54174 | 171 |
SELECT_GOAL (unfold_thms_tac ctxt [Let_def]) THEN' REPEAT_DETERM o |
172 |
(rtac refl ORELSE' atac ORELSE' |
|
53904 | 173 |
resolve_tac split_connectI ORELSE' |
174 |
Splitter.split_tac (split_if :: splits) ORELSE' |
|
54174 | 175 |
distinct_in_prems_tac distincts ORELSE' |
176 |
rtac sym THEN' atac ORELSE' |
|
54042 | 177 |
etac notE THEN' atac)); |
53921 | 178 |
|
53303
ae49b835ca01
moved files related to "primrec_new", "primcorec", and "datatype_compat" from bitbucket co-rec repository
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|
179 |
end; |