src/HOL/Tools/Sledgehammer/sledgehammer_util.ML
author blanchet
Tue Mar 23 11:39:21 2010 +0100 (2010-03-23)
changeset 35963 943e2582dc87
child 36062 194cb6e3c13f
permissions -rw-r--r--
added options to Sledgehammer;
syntax: sledgehammer [options] goal_no, where "[options]" and "goal_no" are optional
     1 (*  Title:      HOL/Sledgehammer/sledgehammer_util.ML
     2     Author:     Jasmin Blanchette, TU Muenchen
     3 
     4 General-purpose functions used by the Sledgehammer modules.
     5 *)
     6 
     7 signature SLEDGEHAMMER_UTIL =
     8 sig
     9   val serial_commas : string -> string list -> string list
    10   val parse_bool_option : bool -> string -> string -> bool option
    11   val parse_time_option : string -> string -> Time.time option
    12 end;
    13 
    14 structure Sledgehammer_Util : SLEDGEHAMMER_UTIL =
    15 struct
    16 
    17 fun serial_commas _ [] = ["??"]
    18   | serial_commas _ [s] = [s]
    19   | serial_commas conj [s1, s2] = [s1, conj, s2]
    20   | serial_commas conj [s1, s2, s3] = [s1 ^ ",", s2 ^ ",", conj, s3]
    21   | serial_commas conj (s :: ss) = s ^ "," :: serial_commas conj ss
    22 
    23 fun parse_bool_option option name s =
    24   (case s of
    25      "smart" => if option then NONE else raise Option
    26    | "false" => SOME false
    27    | "true" => SOME true
    28    | "" => SOME true
    29    | _ => raise Option)
    30   handle Option.Option =>
    31          let val ss = map quote ((option ? cons "smart") ["true", "false"]) in
    32            error ("Parameter " ^ quote name ^ " must be assigned " ^
    33                   space_implode " " (serial_commas "or" ss) ^ ".")
    34          end
    35 
    36 fun parse_time_option _ "none" = NONE
    37   | parse_time_option name s =
    38     let
    39       val msecs =
    40         case space_explode " " s of
    41           [s1, "min"] => 60000 * the (Int.fromString s1)
    42         | [s1, "s"] => 1000 * the (Int.fromString s1)
    43         | [s1, "ms"] => the (Int.fromString s1)
    44         | _ => 0
    45     in
    46       if msecs <= 0 then
    47         error ("Parameter " ^ quote name ^ " must be assigned a positive time \
    48                \value (e.g., \"60 s\", \"200 ms\") or \"none\".")
    49       else
    50         SOME (Time.fromMilliseconds msecs)
    51     end
    52 
    53 end;