--- a/src/HOL/BNF/Tools/bnf_fp_rec_sugar.ML Mon Sep 16 11:22:06 2013 +0200
+++ b/src/HOL/BNF/Tools/bnf_fp_rec_sugar.ML Mon Sep 16 15:03:23 2013 +0200
@@ -37,9 +37,25 @@
fun permute_args n t = list_comb (t, map Bound (0 :: (n downto 1)))
|> fold (K (fn u => Abs (Name.uu, dummyT, u))) (0 upto n);
val abs_tuple = HOLogic.tupled_lambda o HOLogic.mk_tuple;
+fun drop_All t = subst_bounds (strip_qnt_vars @{const_name all} t |> map Free |> rev,
+ strip_qnt_body @{const_name all} t)
+fun mk_not @{const True} = @{const False}
+ | mk_not @{const False} = @{const True}
+ | mk_not (@{const Not} $ t) = t
+ | mk_not (@{const Trueprop} $ t) = @{const Trueprop} $ mk_not t
+ | mk_not t = HOLogic.mk_not t
+val mk_conjs = try (foldr1 HOLogic.mk_conj) #> the_default @{const True};
+val mk_disjs = try (foldr1 HOLogic.mk_disj) #> the_default @{const False};
+
+fun invert_prems [t] = map mk_not (HOLogic.disjuncts t)
+ | invert_prems ts = [mk_disjs (map mk_not ts)];
val simp_attrs = @{attributes [simp]};
+fun abstract n vs (t $ u) = abstract n vs t $ abstract n vs u
+ | abstract n vs (Abs (v, T, b)) = Abs (v, T, abstract (n + 1) vs b)
+ | abstract n vs t = let val idx = find_index (equal t) vs in
+ if idx < 0 then t else Bound (n + idx) end;
(* Primrec *)
@@ -58,10 +74,9 @@
fun dissect_eqn lthy fun_names eqn' =
let
- val eqn = subst_bounds (strip_qnt_vars @{const_name all} eqn' |> map Free |> rev,
- strip_qnt_body @{const_name all} eqn') |> HOLogic.dest_Trueprop
- handle TERM _ =>
- primrec_error_eqn "malformed function equation (expected \"lhs = rhs\")" eqn';
+ val eqn = drop_All eqn' |> HOLogic.dest_Trueprop
+ handle TERM _ =>
+ primrec_error_eqn "malformed function equation (expected \"lhs = rhs\")" eqn';
val (lhs, rhs) = HOLogic.dest_eq eqn
handle TERM _ =>
primrec_error_eqn "malformed function equation (expected \"lhs = rhs\")" eqn';
@@ -342,10 +357,9 @@
in
lthy'
|> fold_map Local_Theory.define defs
- |-> (fn def_thms' => fold_map3 (prove def_thms') (take actual_nn rec_specs)
+ |-> snd oo (fn def_thms' => fold_map3 (prove def_thms') (take actual_nn rec_specs)
(take actual_nn induct_thms) funs_data)
- |> snd
- |> Local_Theory.notes common_notes |> snd
+ |> snd o Local_Theory.notes common_notes
end;
fun add_primrec_cmd raw_fixes raw_specs lthy =
@@ -371,7 +385,7 @@
fun_name: string,
fun_args: term list,
ctr_no: int, (*###*)
- cond: term,
+ prems: term list,
user_eqn: term
};
type co_eqn_data_sel = {
@@ -386,69 +400,59 @@
Disc of co_eqn_data_disc |
Sel of co_eqn_data_sel;
-fun co_dissect_eqn_disc sequential fun_name_corec_spec_list eqn' imp_lhs' imp_rhs matched_conds =
+fun co_dissect_eqn_disc sequential fun_names corec_specs prems' concl matchedss =
let
fun find_subterm p = let (* FIXME \<exists>? *)
fun f (t as u $ v) = if p t then SOME t else merge_options (f u, f v)
| f t = if p t then SOME t else NONE
in f end;
- val fun_name = imp_rhs
- |> perhaps (try HOLogic.dest_not)
- |> `(try (fst o dest_Free o head_of o snd o dest_comb))
- ||> (try (fst o dest_Free o head_of o fst o HOLogic.dest_eq))
- |> the o merge_options;
- val corec_spec = the (AList.lookup (op =) fun_name_corec_spec_list fun_name)
- handle Option.Option => primrec_error_eqn "malformed discriminator equation" imp_rhs;
+ val applied_fun = concl
+ |> find_subterm (member ((op =) o apsnd SOME) fun_names o try (fst o dest_Free o head_of))
+ |> the
+ handle Option.Option => primrec_error_eqn "malformed discriminator equation" concl;
+ val (fun_name, fun_args) = strip_comb applied_fun |>> fst o dest_Free;
+ val corec_spec = the (AList.lookup (op =) (fun_names ~~ corec_specs) fun_name);
val discs = #ctr_specs corec_spec |> map #disc;
val ctrs = #ctr_specs corec_spec |> map #ctr;
- val not_disc = head_of imp_rhs = @{term Not};
+ val not_disc = head_of concl = @{term Not};
val _ = not_disc andalso length ctrs <> 2 andalso
- primrec_error_eqn "\<not>ed discriminator for a type with \<noteq> 2 constructors" imp_rhs;
- val disc = find_subterm (member (op =) discs o head_of) imp_rhs;
- val eq_ctr0 = imp_rhs |> perhaps (try (HOLogic.dest_not)) |> try (HOLogic.dest_eq #> snd)
+ primrec_error_eqn "\<not>ed discriminator for a type with \<noteq> 2 constructors" concl;
+ val disc = find_subterm (member (op =) discs o head_of) concl;
+ val eq_ctr0 = concl |> perhaps (try (HOLogic.dest_not)) |> try (HOLogic.dest_eq #> snd)
|> (fn SOME t => let val n = find_index (equal t) ctrs in
if n >= 0 then SOME n else NONE end | _ => NONE);
val _ = is_some disc orelse is_some eq_ctr0 orelse
- primrec_error_eqn "no discriminator in equation" imp_rhs;
+ primrec_error_eqn "no discriminator in equation" concl;
val ctr_no' =
if is_none disc then the eq_ctr0 else find_index (equal (head_of (the disc))) discs;
val ctr_no = if not_disc then 1 - ctr_no' else ctr_no';
- val fun_args = if is_none disc
- then imp_rhs |> perhaps (try HOLogic.dest_not) |> HOLogic.dest_eq |> fst |> strip_comb |> snd
- else the disc |> the_single o snd o strip_comb
- |> (fn t => if free_name (head_of t) = SOME fun_name
- then snd (strip_comb t) else []);
+
+ val catch_all = try (fst o dest_Free o the_single) prems' = SOME Name.uu_;
+ val matcheds = AList.lookup (op =) matchedss fun_name |> the_default [];
+ val prems = map (abstract 0 (List.rev fun_args)) prems';
+ val real_prems = (if catch_all orelse sequential then invert_prems matcheds else []) @
+ (if catch_all then [] else prems);
- val mk_conjs = try (foldr1 HOLogic.mk_conj) #> the_default @{const True};
- val mk_disjs = try (foldr1 HOLogic.mk_disj) #> the_default @{const False};
- val catch_all = try (fst o dest_Free o the_single) imp_lhs' = SOME Name.uu_;
- val matched_cond = filter (equal fun_name o fst) matched_conds |> map snd |> mk_disjs;
- val imp_lhs = mk_conjs imp_lhs'
- |> incr_boundvars (length fun_args)
- |> subst_atomic (fun_args ~~ map Bound (length fun_args - 1 downto 0))
- val cond =
- if catch_all then
- matched_cond |> HOLogic.mk_not
- else if sequential then
- HOLogic.mk_conj (HOLogic.mk_not matched_cond, imp_lhs)
- else
- imp_lhs;
+ val matchedss' = AList.delete (op =) fun_name matchedss
+ |> cons (fun_name, if sequential then prems @ matcheds else real_prems @ matcheds);
- val matched_conds' =
- (fun_name, if catch_all orelse not sequential then cond else imp_lhs) :: matched_conds;
+ val user_eqn =
+ (real_prems, betapply (#disc (nth (#ctr_specs corec_spec) ctr_no), applied_fun))
+ |>> map HOLogic.mk_Trueprop ||> HOLogic.mk_Trueprop
+ |> Logic.list_implies;
in
(Disc {
fun_name = fun_name,
fun_args = fun_args,
ctr_no = ctr_no,
- cond = cond,
- user_eqn = eqn'
- }, matched_conds')
+ prems = real_prems,
+ user_eqn = user_eqn
+ }, matchedss')
end;
-fun co_dissect_eqn_sel fun_name_corec_spec_list eqn' eqn =
+fun co_dissect_eqn_sel fun_names corec_specs eqn' eqn =
let
val (lhs, rhs) = HOLogic.dest_eq eqn
handle TERM _ =>
@@ -457,11 +461,12 @@
val (fun_name, fun_args) = dest_comb lhs |> snd |> strip_comb |> apfst (fst o dest_Free)
handle TERM _ =>
primrec_error_eqn "malformed selector argument in left-hand side" eqn;
- val corec_spec = the (AList.lookup (op =) fun_name_corec_spec_list fun_name)
+ val corec_spec = the (AList.lookup (op =) (fun_names ~~ corec_specs) fun_name)
handle Option.Option => primrec_error_eqn "malformed selector argument in left-hand side" eqn;
val (ctr_spec, sel) = #ctr_specs corec_spec
|> the o get_index (try (the o find_first (equal sel) o #sels))
|>> nth (#ctr_specs corec_spec);
+ val user_eqn = drop_All eqn';
in
Sel {
fun_name = fun_name,
@@ -469,24 +474,24 @@
ctr = #ctr ctr_spec,
sel = sel,
rhs_term = rhs,
- user_eqn = eqn'
+ user_eqn = user_eqn
}
end;
-fun co_dissect_eqn_ctr sequential fun_name_corec_spec_list eqn' imp_lhs' imp_rhs matched_conds =
+fun co_dissect_eqn_ctr sequential fun_names corec_specs eqn' imp_prems imp_rhs matchedss =
let
val (lhs, rhs) = HOLogic.dest_eq imp_rhs;
val fun_name = head_of lhs |> fst o dest_Free;
- val corec_spec = the (AList.lookup (op =) fun_name_corec_spec_list fun_name);
+ val corec_spec = the (AList.lookup (op =) (fun_names ~~ corec_specs) fun_name);
val (ctr, ctr_args) = strip_comb rhs;
val ctr_spec = the (find_first (equal ctr o #ctr) (#ctr_specs corec_spec))
handle Option.Option => primrec_error_eqn "not a constructor" ctr;
val disc_imp_rhs = betapply (#disc ctr_spec, lhs);
- val (maybe_eqn_data_disc, matched_conds') = if length (#ctr_specs corec_spec) = 1
- then (NONE, matched_conds)
+ val (maybe_eqn_data_disc, matchedss') = if length (#ctr_specs corec_spec) = 1
+ then (NONE, matchedss)
else apfst SOME (co_dissect_eqn_disc
- sequential fun_name_corec_spec_list eqn' imp_lhs' disc_imp_rhs matched_conds);
+ sequential fun_names corec_specs imp_prems disc_imp_rhs matchedss);
val sel_imp_rhss = (#sels ctr_spec ~~ ctr_args)
|> map (fn (sel, ctr_arg) => HOLogic.mk_eq (betapply (sel, lhs), ctr_arg));
@@ -496,17 +501,16 @@
space_implode "\n \<cdot> " (map (Syntax.string_of_term @{context}) sel_imp_rhss));
val eqns_data_sel =
- map (co_dissect_eqn_sel fun_name_corec_spec_list eqn') sel_imp_rhss;
+ map (co_dissect_eqn_sel fun_names corec_specs eqn') sel_imp_rhss;
in
- (map_filter I [maybe_eqn_data_disc] @ eqns_data_sel, matched_conds')
+ (the_list maybe_eqn_data_disc @ eqns_data_sel, matchedss')
end;
-fun co_dissect_eqn sequential fun_name_corec_spec_list eqn' matched_conds =
+fun co_dissect_eqn sequential fun_names corec_specs eqn' matchedss =
let
- val eqn = subst_bounds (strip_qnt_vars @{const_name all} eqn' |> map Free |> rev,
- strip_qnt_body @{const_name all} eqn')
- handle TERM _ => primrec_error_eqn "malformed function equation" eqn';
- val (imp_lhs', imp_rhs) = Logic.strip_horn eqn
+ val eqn = drop_All eqn'
+ handle TERM _ => primrec_error_eqn "malformed function equation" eqn';
+ val (imp_prems, imp_rhs) = Logic.strip_horn eqn
|> apfst (map HOLogic.dest_Trueprop) o apsnd HOLogic.dest_Trueprop;
val head = imp_rhs
@@ -515,61 +519,29 @@
val maybe_rhs = imp_rhs |> perhaps (try (HOLogic.dest_not)) |> try (snd o HOLogic.dest_eq);
- val fun_names = map fst fun_name_corec_spec_list;
- val discs = maps (#ctr_specs o snd) fun_name_corec_spec_list |> map #disc;
- val sels = maps (#ctr_specs o snd) fun_name_corec_spec_list |> maps #sels;
- val ctrs = maps (#ctr_specs o snd) fun_name_corec_spec_list |> map #ctr;
+ val discs = maps #ctr_specs corec_specs |> map #disc;
+ val sels = maps #ctr_specs corec_specs |> maps #sels;
+ val ctrs = maps #ctr_specs corec_specs |> map #ctr;
in
if member (op =) discs head orelse
is_some maybe_rhs andalso
member (op =) (filter (null o binder_types o fastype_of) ctrs) (the maybe_rhs) then
- co_dissect_eqn_disc sequential fun_name_corec_spec_list eqn' imp_lhs' imp_rhs matched_conds
+ co_dissect_eqn_disc sequential fun_names corec_specs imp_prems imp_rhs matchedss
|>> single
else if member (op =) sels head then
- ([co_dissect_eqn_sel fun_name_corec_spec_list eqn' imp_rhs], matched_conds)
+ ([co_dissect_eqn_sel fun_names corec_specs eqn' imp_rhs], matchedss)
else if is_Free head andalso member (op =) fun_names (fst (dest_Free head)) then
- co_dissect_eqn_ctr sequential fun_name_corec_spec_list eqn' imp_lhs' imp_rhs matched_conds
+ co_dissect_eqn_ctr sequential fun_names corec_specs eqn' imp_prems imp_rhs matchedss
else
primrec_error_eqn "malformed function equation" eqn
end;
-fun build_corec_args_discs disc_eqns ctr_specs =
- if null disc_eqns then I else
- let
-(*val _ = tracing ("d/p:\<cdot> " ^ space_implode "\n \<cdot> " (map ((op ^) o
- apfst (Syntax.string_of_term @{context}) o apsnd (curry (op ^) " / " o @{make_string}))
- (ctr_specs |> map_filter (fn {disc, pred = SOME pred, ...} => SOME (disc, pred) | _ => NONE))));*)
- val conds = map #cond disc_eqns;
- val fun_args = #fun_args (hd disc_eqns);
- val args =
- if length ctr_specs = 1 then []
- else if length disc_eqns = length ctr_specs then
- fst (split_last conds)
- else if length disc_eqns = length ctr_specs - 1 then
- let val n = 0 upto length ctr_specs - 1
- |> the(*###*) o find_first (fn idx => not (exists (equal idx o #ctr_no) disc_eqns)) in
- if n = length ctr_specs - 1 then
- conds
- else
- split_last conds
- ||> HOLogic.mk_not
- |> `(uncurry (fold (curry HOLogic.mk_conj o HOLogic.mk_not)))
- ||> chop n o fst
- |> (fn (x, (l, r)) => l @ (x :: r))
- end
- else
- 0 upto length ctr_specs - 1
- |> map (fn idx => find_first (equal idx o #ctr_no) disc_eqns
- |> Option.map #cond
- |> the_default undef_const)
- |> fst o split_last;
- in
- (* FIXME deal with #preds above *)
- (map_filter #pred ctr_specs, args)
- |-> fold2 (fn idx => fn t => nth_map idx
- (K (subst_bounds (List.rev fun_args, t)
- |> HOLogic.tupled_lambda (HOLogic.mk_tuple fun_args))))
- end;
+fun build_corec_arg_disc ctr_specs {fun_args, ctr_no, prems, ...} =
+ if is_none (#pred (nth ctr_specs ctr_no)) then I else
+ mk_conjs prems
+ |> curry subst_bounds (List.rev fun_args)
+ |> HOLogic.tupled_lambda (HOLogic.mk_tuple fun_args)
+ |> K |> nth_map (the (#pred (nth ctr_specs ctr_no)));
fun build_corec_arg_no_call sel_eqns sel = find_first (equal sel o #sel) sel_eqns
|> try (fn SOME sel_eqn => (#fun_args sel_eqn, #rhs_term sel_eqn))
@@ -580,7 +552,7 @@
fun build_corec_arg_direct_call lthy has_call sel_eqns sel =
let
val maybe_sel_eqn = find_first (equal sel o #sel) sel_eqns;
- fun rewrite is_end U T t =
+ fun rewrite is_end U _ t =
if U = @{typ bool} then @{term True} |> has_call t ? K @{term False} (* stop? *)
else if is_end = has_call t then undef_const
else if is_end then t (* end *)
@@ -626,10 +598,6 @@
let
val sel_call_list = #sels ctr_spec ~~ #calls ctr_spec;
-(*val _ = tracing ("s/c:\<cdot> " ^ space_implode "\n \<cdot> " (map ((op ^) o
- apfst (Syntax.string_of_term lthy) o apsnd (curry (op ^) " / " o @{make_string}))
- sel_call_list));*)
-
val no_calls' = map_filter (try (apsnd (fn No_Corec n => n))) sel_call_list;
val direct_calls' = map_filter (try (apsnd (fn Direct_Corec n => n))) sel_call_list;
val indirect_calls' = map_filter (try (apsnd (fn Indirect_Corec n => n))) sel_call_list;
@@ -645,37 +613,43 @@
end
end;
-fun co_build_defs lthy sequential bs mxs has_call arg_Tss fun_name_corec_spec_list eqns_data =
+fun mk_real_disc_eqns ctr_specs disc_eqns =
let
- val fun_names = map Binding.name_of bs;
+ val real_disc_eqns =
+ if length disc_eqns = 0 then disc_eqns
+ else if length disc_eqns = length ctr_specs - 1 then
+ let
+ val n = 0 upto length ctr_specs
+ |> the(*###*) o find_first (fn idx => not (exists (equal idx o #ctr_no) disc_eqns));
+ val extra_disc_eqn = {
+ fun_name = #fun_name (hd disc_eqns),
+ fun_args = #fun_args (hd disc_eqns),
+ ctr_no = n,
+ prems = maps (invert_prems o #prems) disc_eqns,
+ user_eqn = Const (@{const_name undefined}, dummyT)};
+ in
+ chop n disc_eqns ||> cons extra_disc_eqn |> (op @)
+ end
+ else disc_eqns;
+ in
+ real_disc_eqns
+ end;
- val disc_eqnss = map_filter (try (fn Disc x => x)) eqns_data
- |> partition_eq ((op =) o pairself #fun_name)
- |> finds (fn (x, ({fun_name, ...} :: _)) => x = fun_name) fun_names |> fst
- |> map (sort ((op <) o pairself #ctr_no |> make_ord) o flat o snd);
-
+fun co_build_defs lthy bs mxs has_call arg_Tss corec_specs disc_eqnss sel_eqnss =
+ let
val _ = disc_eqnss |> map (fn x =>
let val d = duplicates ((op =) o pairself #ctr_no) x in null d orelse
primrec_error_eqns "excess discriminator equations in definition"
(maps (fn t => filter (equal (#ctr_no t) o #ctr_no) x) d |> map #user_eqn) end);
-
-(*val _ = tracing ("disc_eqnss:\n \<cdot> " ^ space_implode "\n \<cdot> " (map @{make_string} disc_eqnss));*)
-
- val sel_eqnss = map_filter (try (fn Sel x => x)) eqns_data
- |> partition_eq ((op =) o pairself #fun_name)
- |> finds (fn (x, ({fun_name, ...} :: _)) => x = fun_name) fun_names |> fst
- |> map (flat o snd);
-
-(*val _ = tracing ("sel_eqnss:\n \<cdot> " ^ space_implode "\n \<cdot> " (map @{make_string} sel_eqnss));*)
-
- val corecs = map (#corec o snd) fun_name_corec_spec_list;
- val ctr_specss = map (#ctr_specs o snd) fun_name_corec_spec_list;
+ val corec_specs' = take (length bs) corec_specs;
+ val corecs = map #corec corec_specs';
+ val ctr_specss = map #ctr_specs corec_specs';
+ val real_disc_eqnss = map2 mk_real_disc_eqns ctr_specss disc_eqnss;
val corec_args = hd corecs
|> fst o split_last o binder_types o fastype_of
|> map (Const o pair @{const_name undefined})
- |> fold2 build_corec_args_discs disc_eqnss ctr_specss
+ |> fold2 (fold o build_corec_arg_disc) ctr_specss real_disc_eqnss
|> fold2 (fold o build_corec_args_sel lthy has_call) sel_eqnss ctr_specss;
-
fun currys Ts t = if length Ts <= 1 then t else
t $ foldr1 (fn (u, v) => HOLogic.pair_const dummyT dummyT $ u $ v)
(length Ts - 1 downto 0 |> map Bound)
@@ -684,25 +658,22 @@
val _ = tracing ("corecursor arguments:\n \<cdot> " ^
space_implode "\n \<cdot> " (map (Syntax.string_of_term lthy) corec_args));
- fun uneq_pairs_rev xs = xs (* FIXME \<exists>? *)
- |> these o try (split_last #> (fn (ys, y) => uneq_pairs_rev ys @ map (pair y) ys));
- val proof_obligations = if sequential then [] else
- disc_eqnss
- |> maps (uneq_pairs_rev o map (fn {fun_args, cond, ...} => (fun_args, cond)))
- |> map (fn ((fun_args, x), (_, y)) => [x, HOLogic.mk_not y]
- |> map (HOLogic.mk_Trueprop o curry subst_bounds (List.rev fun_args))
- |> curry list_comb @{const ==>});
-
-val _ = tracing ("proof obligations:\n \<cdot> " ^
- space_implode "\n \<cdot> " (map (Syntax.string_of_term lthy) proof_obligations));
-
+ val exclss' =
+ real_disc_eqnss
+ |> map (map (fn {fun_args, ctr_no, prems, ...} => (fun_args, ctr_no, prems))
+ #> fst o (fn xs => fold_map (fn x => fn ys => ((x, ys), ys @ [x])) xs [])
+ #> maps (uncurry (map o pair)
+ #> map (fn ((fun_args, c, x), (_, c', y)) => ((c, c'), (x, mk_not (mk_conjs y)))
+ ||> apfst (map HOLogic.mk_Trueprop) o apsnd HOLogic.mk_Trueprop
+ ||> Logic.list_implies
+ ||> curry Logic.list_all (map dest_Free fun_args))))
in
map (list_comb o rpair corec_args) corecs
|> map2 (fn Ts => fn t => if length Ts = 0 then t $ HOLogic.unit else t) arg_Tss
|> map2 currys arg_Tss
|> Syntax.check_terms lthy
|> map3 (fn b => fn mx => fn t => ((b, mx), ((Binding.map_name Thm.def_name b, []), t))) bs mxs
- |> rpair proof_obligations
+ |> rpair exclss'
end;
fun add_primcorec sequential fixes specs lthy =
@@ -717,28 +688,111 @@
val callssss = []; (* FIXME *)
- val ((nontriv, corec_specs, _, coinduct_thm, strong_co_induct_thm, coinduct_thmss,
+ val ((nontriv, corec_specs', _, coinduct_thm, strong_co_induct_thm, coinduct_thmss,
strong_coinduct_thmss), lthy') =
corec_specs_of bs arg_Ts res_Ts get_indices callssss lthy;
val fun_names = map Binding.name_of bs;
-
- val fun_name_corec_spec_list = (fun_names ~~ res_Ts, corec_specs)
- |> uncurry (finds (fn ((_, T), {corec, ...}) => T = body_type (fastype_of corec))) |> fst
- |> map (apfst fst #> apsnd the_single); (*###*)
+ val corec_specs = take (length fun_names) corec_specs'; (*###*)
val (eqns_data, _) =
- fold_map (co_dissect_eqn sequential fun_name_corec_spec_list) (map snd specs) []
+ fold_map (co_dissect_eqn sequential fun_names corec_specs) (map snd specs) []
|>> flat;
+ val disc_eqnss = map_filter (try (fn Disc x => x)) eqns_data
+ |> partition_eq ((op =) o pairself #fun_name)
+ |> finds (fn (x, ({fun_name, ...} :: _)) => x = fun_name) fun_names |> fst
+ |> map (sort ((op <) o pairself #ctr_no |> make_ord) o flat o snd);
+
+ val sel_eqnss = map_filter (try (fn Sel x => x)) eqns_data
+ |> partition_eq ((op =) o pairself #fun_name)
+ |> finds (fn (x, ({fun_name, ...} :: _)) => x = fun_name) fun_names |> fst
+ |> map (flat o snd);
+
val has_call = exists_subterm (map (fst #>> Binding.name_of #> Free) fixes |> member (op =));
val arg_Tss = map (binder_types o snd o fst) fixes;
- val (defs, proof_obligations) =
- co_build_defs lthy' sequential bs mxs has_call arg_Tss fun_name_corec_spec_list eqns_data;
+ val (defs, exclss') =
+ co_build_defs lthy' bs mxs has_call arg_Tss corec_specs disc_eqnss sel_eqnss;
+
+ (* try to prove (automatically generated) tautologies by ourselves *)
+ val exclss'' = exclss'
+ |> map (map (apsnd
+ (`(try (fn t => Goal.prove lthy [] [] t (mk_primcorec_taut_tac lthy |> K))))));
+ val taut_thmss = map (map (apsnd (the o fst)) o filter (is_some o fst o snd)) exclss'';
+ val (obligation_idxss, obligationss) = exclss''
+ |> map (map (apsnd (rpair [] o snd)) o filter (is_none o fst o snd))
+ |> split_list o map split_list;
+
+ fun prove thmss' def_thms' lthy =
+ let
+ val def_thms = map (snd o snd) def_thms';
+
+ val exclss' = map (op ~~) (obligation_idxss ~~ thmss');
+ fun mk_exclsss excls n =
+ (excls, map (fn k => replicate k [TrueI] @ replicate (n - k) []) (0 upto n - 1))
+ |-> fold (fn ((c, c'), thm) => nth_map c (nth_map c' (K [thm])));
+ val exclssss = (exclss' ~~ taut_thmss |> map (op @), fun_names ~~ corec_specs)
+ |-> map2 (fn excls => fn (_, {ctr_specs, ...}) => mk_exclsss excls (length ctr_specs));
+
+ fun prove_disc {ctr_specs, ...} exclsss
+ {fun_name, fun_args, ctr_no, prems, ...} =
+ let
+ val disc_corec = nth ctr_specs ctr_no |> #disc_corec;
+ val k = 1 + ctr_no;
+ val m = length prems;
+ val t =
+ (* FIXME use applied_fun from dissect_\<dots> instead? *)
+ list_comb (Free (fun_name, dummyT), map Bound (length fun_args - 1 downto 0))
+ |> curry betapply (#disc (nth ctr_specs ctr_no)) (*###*)
+ |> HOLogic.mk_Trueprop
+ |> curry Logic.list_implies (map HOLogic.mk_Trueprop prems)
+ |> curry Logic.list_all (map dest_Free fun_args)
+ |> Syntax.check_term lthy(*###*);
+ in
+ mk_primcorec_disc_tac lthy def_thms disc_corec k m exclsss
+ |> K |> Goal.prove lthy [] [] t
+ end;
+
+ (* FIXME don't use user_eqn (cf. constructor view reduction),
+ instead generate "sel" and "code" theorems ourselves *)
+ fun prove_sel
+ ((fun_name, {ctr_specs, nested_maps, nested_map_idents, nested_map_comps, ...}),
+ disc_eqns) exclsss sel_eqn =
+ let
+ val (SOME ctr_spec) = find_first (equal (#ctr sel_eqn) o #ctr) ctr_specs;
+ val ctr_no = find_index (equal (#ctr sel_eqn) o #ctr) ctr_specs;
+ val prems = the_default (maps (invert_prems o #prems) disc_eqns)
+ (find_first (equal ctr_no o #ctr_no) disc_eqns |> Option.map #prems);
+ val sel_corec = find_index (equal (#sel sel_eqn)) (#sels ctr_spec)
+ |> nth (#sel_corecs ctr_spec);
+ val k = 1 + ctr_no;
+ val m = length prems;
+ val t = #user_eqn sel_eqn
+ |> abstract 0 (List.rev (#fun_args sel_eqn)) (* FIXME do this in dissect_\<dots> *)
+ |> curry Logic.list_implies (map HOLogic.mk_Trueprop prems)
+ |> curry Logic.list_all (map dest_Free (#fun_args sel_eqn));
+ in
+ mk_primcorec_eq_tac lthy def_thms sel_corec k m exclsss
+ nested_maps nested_map_idents nested_map_comps
+ |> K |> Goal.prove lthy [] [] t
+ end;
+
+ val disc_notes =
+ fun_names ~~
+ map3 (map oo prove_disc) (take (length disc_eqnss) corec_specs) exclssss disc_eqnss
+ |> map (fn (fun_name, thms) =>
+ ((Binding.qualify true fun_name (@{binding disc}), simp_attrs), [(thms, [])]));
+ val sel_notes =
+ fun_names ~~
+ map3 (map oo prove_sel) (fun_names ~~ corec_specs ~~ disc_eqnss) exclssss sel_eqnss
+ |> map (fn (fun_name, thms) =>
+ ((Binding.qualify true fun_name (@{binding sel}), simp_attrs), [(thms, [])]));
+ in
+ lthy |> snd o Local_Theory.notes (disc_notes @ sel_notes)
+ end;
in
lthy'
- |> fold_map Local_Theory.define defs |> snd
- |> Proof.theorem NONE (K I) [map (rpair []) proof_obligations]
+ |> Proof.theorem NONE (curry (op #->) (fold_map Local_Theory.define defs) o prove) obligationss
|> Proof.refine (Method.primitive_text I)
|> Seq.hd
end