author | blanchet |
Thu, 26 Sep 2013 17:24:15 +0200 | |
changeset 53929 | 8c5aaf557421 |
parent 53926 | 9fc9a59ad579 |
child 53961 | 16d9ecdf519a |
permissions | -rw-r--r-- |
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(* Title: HOL/BNF/Tools/bnf_fp_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 recursor and corecursor sugar. |
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*) |
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signature BNF_FP_REC_SUGAR_TACTICS = |
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sig |
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val mk_primcorec_assumption_tac: Proof.context -> thm list -> tactic |
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val mk_primcorec_code_of_ctr_tac: Proof.context -> thm list -> thm list -> thm list -> thm list -> |
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int list -> thm list -> tactic |
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val mk_primcorec_code_of_raw_tac: 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_sel_tac: Proof.context -> thm list -> thm list -> thm list -> thm list -> |
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thm list -> thm list -> thm list -> thm -> int -> int -> thm list list list -> tactic |
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val mk_primrec_tac: Proof.context -> int -> thm list -> thm list -> thm list -> thm -> tactic |
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end; |
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structure BNF_FP_Rec_Sugar_Tactics : BNF_FP_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 falseEs = @{thms not_TrueE FalseE}; |
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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_primrec_tac ctxt num_extra_args map_idents map_comps fun_defs recx = |
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unfold_thms_tac ctxt fun_defs THEN |
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HEADGOAL (rtac (funpow num_extra_args (fn thm => thm RS fun_cong) recx RS trans)) THEN |
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unfold_thms_tac ctxt (@{thms id_def split o_def fst_conv snd_conv} @ map_comps @ map_idents) THEN |
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HEADGOAL (rtac refl); |
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fun mk_primcorec_assumption_tac ctxt discIs = |
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HEADGOAL (SELECT_GOAL (unfold_thms_tac ctxt |
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@{thms not_not not_False_eq_True 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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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 excl = |
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unfold_thms_tac ctxt @{thms not_not not_False_eq_True not_True_eq_False} THEN |
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HEADGOAL (rtac excl THEN_ALL_NEW SELECT_GOAL (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 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 unfold_thms_tac ctxt @{thms 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 mk_primcorec_sel_tac ctxt defs distincts splits split_asms maps map_idents map_comps f_sel k m |
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exclsss = |
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mk_primcorec_prelude ctxt defs (f_sel RS trans) THEN |
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mk_primcorec_cases_tac ctxt k m exclsss THEN |
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unfold_thms_tac ctxt (@{thms o_def split_def sum.cases} @ maps @ map_comps @ map_idents) THEN |
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HEADGOAL (REPEAT_DETERM o (rtac refl 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)); |
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fun mk_primcorec_ctr_of_dtr_tac ctxt m collapse maybe_disc_f sel_fs = |
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HEADGOAL (rtac ((if null sel_fs then collapse else collapse RS sym) RS trans) THEN' |
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(the_default (K all_tac) (Option.map rtac maybe_disc_f)) THEN' REPEAT_DETERM_N m o atac) THEN |
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unfold_thms_tac ctxt sel_fs THEN HEADGOAL (rtac refl); |
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(* TODO: reduce code duplication with selector tactic above *) |
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fun mk_primcorec_code_of_ctr_single_tac ctxt distincts discIs splits split_asms m f_ctr = |
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HEADGOAL (REPEAT o (resolve_tac split_connectI ORELSE' split_tac (split_if :: splits))) THEN |
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mk_primcorec_prelude ctxt [] (f_ctr RS trans) THEN |
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REPEAT_DETERM_N m (mk_primcorec_assumption_tac ctxt discIs) THEN |
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HEADGOAL (SELECT_GOAL (SOLVE (HEADGOAL (REPEAT_DETERM o |
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(rtac refl ORELSE' atac 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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K (mk_primcorec_assumption_tac ctxt discIs) ORELSE' |
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eresolve_tac (map (fn thm => thm RS neq_eq_eq_contradict) distincts) THEN' atac ORELSE' |
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(TRY o dresolve_tac discIs) THEN' etac notE THEN' atac))))); |
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fun mk_primcorec_code_of_ctr_tac ctxt distincts discIs splits split_asms ms ctr_thms = |
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EVERY (map2 (mk_primcorec_code_of_ctr_single_tac ctxt distincts discIs splits split_asms) |
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ms ctr_thms); |
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fun mk_primcorec_code_of_raw_tac splits disc_excludes raw = |
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HEADGOAL (rtac raw ORELSE' rtac (raw RS trans) THEN' REPEAT_DETERM o |
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(rtac refl ORELSE' |
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(TRY o rtac sym) THEN' atac ORELSE' |
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resolve_tac split_connectI ORELSE' |
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Splitter.split_tac (split_if :: splits) ORELSE' |
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etac notE THEN' atac ORELSE' |
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(TRY o dresolve_tac disc_excludes) THEN' etac notE THEN' atac)); |
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end; |