src/HOL/Tools/Sledgehammer/sledgehammer_util.ML
author blanchet
Tue Apr 27 16:00:20 2010 +0200 (2010-04-27)
changeset 36478 1aba777a367f
parent 36402 1b20805974c7
child 36486 c2d7e2dff59e
permissions -rw-r--r--
fix types of "fix" variables to help proof reconstruction and aid readability
     1 (*  Title:      HOL/Tools/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 pairf : ('a -> 'b) -> ('a -> 'c) -> 'a -> 'b * 'c
    10   val plural_s : int -> string
    11   val serial_commas : string -> string list -> string list
    12   val replace_all : string -> string -> string -> string
    13   val remove_all : string -> string -> string
    14   val timestamp : unit -> string
    15   val parse_bool_option : bool -> string -> string -> bool option
    16   val parse_time_option : string -> string -> Time.time option
    17   val unyxml : string -> string
    18   val maybe_quote : string -> string
    19 end;
    20  
    21 structure Sledgehammer_Util : SLEDGEHAMMER_UTIL =
    22 struct
    23 
    24 fun pairf f g x = (f x, g x)
    25 
    26 fun plural_s n = if n = 1 then "" else "s"
    27 
    28 fun serial_commas _ [] = ["??"]
    29   | serial_commas _ [s] = [s]
    30   | serial_commas conj [s1, s2] = [s1, conj, s2]
    31   | serial_commas conj [s1, s2, s3] = [s1 ^ ",", s2 ^ ",", conj, s3]
    32   | serial_commas conj (s :: ss) = s ^ "," :: serial_commas conj ss
    33 
    34 fun replace_all bef aft =
    35   let
    36     fun aux seen "" = String.implode (rev seen)
    37       | aux seen s =
    38         if String.isPrefix bef s then
    39           aux seen "" ^ aft ^ aux [] (unprefix bef s)
    40         else
    41           aux (String.sub (s, 0) :: seen) (String.extract (s, 1, NONE))
    42   in aux [] end
    43 fun remove_all bef = replace_all bef ""
    44 
    45 val timestamp = Date.fmt "%Y-%m-%d %H:%M:%S" o Date.fromTimeLocal o Time.now
    46 
    47 fun parse_bool_option option name s =
    48   (case s of
    49      "smart" => if option then NONE else raise Option
    50    | "false" => SOME false
    51    | "true" => SOME true
    52    | "" => SOME true
    53    | _ => raise Option)
    54   handle Option.Option =>
    55          let val ss = map quote ((option ? cons "smart") ["true", "false"]) in
    56            error ("Parameter " ^ quote name ^ " must be assigned " ^
    57                   space_implode " " (serial_commas "or" ss) ^ ".")
    58          end
    59 
    60 fun parse_time_option _ "none" = NONE
    61   | parse_time_option name s =
    62     let
    63       val msecs =
    64         case space_explode " " s of
    65           [s1, "min"] => 60000 * the (Int.fromString s1)
    66         | [s1, "s"] => 1000 * the (Int.fromString s1)
    67         | [s1, "ms"] => the (Int.fromString s1)
    68         | _ => 0
    69     in
    70       if msecs <= 0 then
    71         error ("Parameter " ^ quote name ^ " must be assigned a positive time \
    72                \value (e.g., \"60 s\", \"200 ms\") or \"none\".")
    73       else
    74         SOME (Time.fromMilliseconds msecs)
    75     end
    76 
    77 fun plain_string_from_xml_tree t =
    78   Buffer.empty |> XML.add_content t |> Buffer.content
    79 val unyxml = plain_string_from_xml_tree o YXML.parse
    80 
    81 val is_long_identifier = forall Syntax.is_identifier o space_explode "."
    82 fun maybe_quote y =
    83   let val s = unyxml y in
    84     y |> ((not (is_long_identifier (perhaps (try (unprefix "'")) s)) andalso
    85            not (is_long_identifier (perhaps (try (unprefix "?")) s))) orelse
    86            OuterKeyword.is_keyword s) ? quote
    87   end
    88 
    89 end;