(* 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 pairf : ('a -> 'b) -> ('a -> 'c) -> 'a -> 'b * 'c
val plural_s : int -> string
val serial_commas : string -> string list -> string list
val replace_all : string -> string -> string -> string
val remove_all : string -> string -> string
val timestamp : unit -> string
val parse_bool_option : bool -> string -> string -> bool option
val parse_time_option : string -> string -> Time.time option
val nat_subscript : int -> string
val unyxml : string -> string
val maybe_quote : string -> string
end;
structure Sledgehammer_Util : SLEDGEHAMMER_UTIL =
struct
fun pairf f g x = (f x, g x)
fun plural_s n = if n = 1 then "" else "s"
fun serial_commas _ [] = ["??"]
| serial_commas _ [s] = [s]
| serial_commas conj [s1, s2] = [s1, conj, s2]
| serial_commas conj [s1, s2, s3] = [s1 ^ ",", s2 ^ ",", conj, s3]
| serial_commas conj (s :: ss) = s ^ "," :: serial_commas conj ss
fun replace_all bef aft =
let
fun aux seen "" = String.implode (rev seen)
| aux seen s =
if String.isPrefix bef s then
aux seen "" ^ aft ^ aux [] (unprefix bef s)
else
aux (String.sub (s, 0) :: seen) (String.extract (s, 1, NONE))
in aux [] end
fun remove_all bef = replace_all bef ""
val timestamp = Date.fmt "%Y-%m-%d %H:%M:%S" o Date.fromTimeLocal o Time.now
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
fun parse_time_option _ "none" = NONE
| parse_time_option name s =
let
val msecs =
case space_explode " " s of
[s1, "min"] => 60000 * the (Int.fromString s1)
| [s1, "s"] => 1000 * the (Int.fromString s1)
| [s1, "ms"] => the (Int.fromString s1)
| _ => 0
in
if msecs <= 0 then
error ("Parameter " ^ quote name ^ " must be assigned a positive time \
\value (e.g., \"60 s\", \"200 ms\") or \"none\".")
else
SOME (Time.fromMilliseconds msecs)
end
val subscript = implode o map (prefix "\<^isub>") o explode
val nat_subscript = subscript o string_of_int
fun plain_string_from_xml_tree t =
Buffer.empty |> XML.add_content t |> Buffer.content
val unyxml = plain_string_from_xml_tree o YXML.parse
val is_long_identifier = forall Syntax.is_identifier o space_explode "."
fun maybe_quote y =
let val s = unyxml y in
y |> ((not (is_long_identifier (perhaps (try (unprefix "'")) s)) andalso
not (is_long_identifier (perhaps (try (unprefix "?")) s))) orelse
OuterKeyword.is_keyword s) ? quote
end
end;