discontinued slightly odd built-in timing (cf. 53fd5cc685b4) -- the Isar toplevel does that already (e.g. via Toplevel.timing or Toplevel.profiling);
(* Title: HOL/Tools/Quickcheck/find_unused_assms.ML
Author: Lukas Bulwahn, TU Muenchen
Finding unused assumptions in lemmas (using Quickcheck)
*)
signature FIND_UNUSED_ASSMS =
sig
val find_unused_assms : Proof.context -> string -> (string * int list list option) list
val print_unused_assms : Proof.context -> string option -> unit
end;
structure Find_Unused_Assms : FIND_UNUSED_ASSMS =
struct
fun all_unconcealed_thms_of thy =
let
val facts = Global_Theory.facts_of thy
in
Facts.fold_static
(fn (s, ths) =>
if Facts.is_concealed facts s then I else append (map (`(Thm.get_name_hint)) ths))
facts []
end;
fun thms_of thy thy_name = all_unconcealed_thms_of thy
|> filter (fn (_, th) => Context.theory_name (theory_of_thm th) = thy_name);
fun do_while P f s = if P s then (let val s' = f s in (do_while P f s') o (cons s') end) else I
fun drop_indexes is xs = fold_index (fn (i, x) => if member (op =) is i then I else cons x) xs []
fun find_max_subsets [] = []
| find_max_subsets (ss :: sss) = ss ::
(find_max_subsets (map (filter_out (fn s => exists (fn s' => subset (op =) (s, s')) ss)) sss))
(* main functionality *)
fun find_unused_assms ctxt thy_name =
let
val ctxt' = ctxt
|> Config.put Quickcheck.abort_potential true
|> Config.put Quickcheck.quiet true
val all_thms = filter (fn (s, _) => length (Long_Name.explode s) = 2) (* FIXME !? *)
(thms_of (Proof_Context.theory_of ctxt) thy_name)
fun check_single conjecture =
case try (Quickcheck.test_terms ctxt' (true, true) []) [(conjecture, [])] of
SOME (SOME _) => false
| SOME NONE => true
| NONE => false
fun build X Ss =
fold (fn S => fold
(fn x => if member (op =) S x then I
else insert (eq_set (op =)) (insert (op =) x S)) X) Ss []
fun check (s, th) =
case Logic.strip_horn (prop_of (Thm.unvarify_global th)) of
([], _) => cons (s, NONE)
| (ts, t) =>
let
fun mk_conjecture is = (Logic.list_implies (drop_indexes is ts, t))
val singles = filter (check_single o mk_conjecture o single) (map_index fst ts)
val multiples = do_while (not o null)
(fn I => filter (check_single o mk_conjecture) (build singles I))
(map single singles) [(map single singles)]
val maximals = flat (find_max_subsets multiples)
in
cons (s, SOME maximals)
end
in
fold check all_thms []
end
(* printing results *)
fun pretty_indexes is =
Pretty.block (separate (Pretty.str " and ")
(map (fn x => Pretty.str (string_of_int (x + 1))) (sort int_ord is))
@ [Pretty.brk 1])
fun pretty_thm (s, SOME set_of_indexes) =
Pretty.block (Pretty.str s :: Pretty.str ":" :: Pretty.brk 1 ::
Pretty.str "unnecessary assumption(s) " ::
separate (Pretty.str ", or ") (map pretty_indexes set_of_indexes))
fun print_unused_assms ctxt opt_thy_name =
let
val thy_name = the_default (Context.theory_name (Proof_Context.theory_of ctxt)) opt_thy_name
val results = find_unused_assms ctxt thy_name
val total = length results
val with_assumptions = length (filter (is_some o snd) results)
val with_superfluous_assumptions = filter_out (fn (_, r) => r = SOME [])
(filter (is_some o snd) results)
val msg = "Found " ^ string_of_int (length with_superfluous_assumptions)
^ " theorem(s) with (potentially) superfluous assumptions"
val end_msg = "Checked " ^ string_of_int with_assumptions ^ " theorem(s) with assumptions"
^ " in the theory " ^ quote thy_name
^ " with a total of " ^ string_of_int total ^ " theorem(s)"
in
([Pretty.str (msg ^ ":"), Pretty.str ""] @
map pretty_thm with_superfluous_assumptions
@ [Pretty.str "", Pretty.str end_msg])
end |> Pretty.chunks |> Pretty.writeln;
val _ =
Outer_Syntax.improper_command "find_unused_assms" "find theorems with superfluous assumptions"
Keyword.diag
(Scan.option Parse.name
>> (fn opt_thy_name =>
Toplevel.no_timing o Toplevel.keep (fn state =>
print_unused_assms (Toplevel.context_of state) opt_thy_name)));
end;