(* Title: HOL/Tools/Sledgehammer/sledgehammer_util.ML
Author: Jasmin Blanchette, TU Muenchen
General-purpose functions used by the Sledgehammer modules.
*)
signature SLEDGEHAMMER_UTIL =
sig
val plural_s : int -> string
val serial_commas : string -> string list -> string list
val simplify_spaces : string -> string
val parse_bool_option : bool -> string -> string -> bool option
val parse_time_option : string -> string -> Time.time option
val subgoal_count : Proof.state -> int
val normalize_chained_theorems : thm list -> thm list
val reserved_isar_keyword_table : unit -> unit Symtab.table
val thms_in_proof : string list option -> thm -> string list
end;
structure Sledgehammer_Util : SLEDGEHAMMER_UTIL =
struct
open ATP_Util
fun plural_s n = if n = 1 then "" else "s"
val serial_commas = Try.serial_commas
val simplify_spaces = strip_spaces false (K true)
fun parse_bool_option option name s =
(case s of
"smart" => if option then NONE else raise Option
| "false" => SOME false
| "true" => SOME true
| "" => SOME true
| _ => raise Option)
handle Option.Option =>
let val ss = map quote ((option ? cons "smart") ["true", "false"]) in
error ("Parameter " ^ quote name ^ " must be assigned " ^
space_implode " " (serial_commas "or" ss) ^ ".")
end
val has_junk =
exists (fn s => not (Symbol.is_digit s) andalso s <> ".") o raw_explode (* FIXME Symbol.explode (?) *)
fun parse_time_option _ "none" = NONE
| parse_time_option name s =
let val secs = if has_junk s then NONE else Real.fromString s in
if is_none secs orelse Real.< (the secs, 0.0) then
error ("Parameter " ^ quote name ^ " must be assigned a nonnegative \
\number of seconds (e.g., \"60\", \"0.5\") or \"none\".")
else
SOME (seconds (the secs))
end
val subgoal_count = Try.subgoal_count
val normalize_chained_theorems =
maps (fn th => insert Thm.eq_thm_prop (zero_var_indexes th) [th])
fun reserved_isar_keyword_table () =
Keyword.dest () |-> union (op =)
|> map (rpair ()) |> Symtab.make
(* FIXME: Similar yet different code in "mirabelle.ML". The code here has a few
fixes that seem to be missing over there; or maybe the two code portions are
not doing the same? *)
fun fold_body_thms thm_name f =
let
fun app n (PBody {thms, ...}) =
thms |> fold (fn (_, (name, prop, body)) => fn x =>
let
val body' = Future.join body
val n' =
n + (if name = "" orelse
(* uncommon case where the proved theorem occurs twice
(e.g., "Transitive_Closure.trancl_into_trancl") *)
(n = 1 andalso name = thm_name) then
0
else
1)
val x' = x |> n' <= 1 ? app n' body'
in (x' |> n = 1 ? f (name, prop, body')) end)
in fold (app 0) end
fun thms_in_proof all_names th =
let
val is_name_ok =
case all_names of
SOME names => member (op =) names
| NONE => (fn s => s <> "" andalso not (String.isPrefix "Pure." s))
fun collect (s, _, _) = is_name_ok s ? insert (op =) s
val names =
[] |> fold_body_thms (Thm.get_name_hint th) collect [Thm.proof_body_of th]
in names end
end;