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(*
Title: Standard Basis Library: Int32 Structure
Author: Vesa Karvonen
Copyright David Matthews 1999
Vesa Karvonen 2007
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*)
(*
This is a hacked version of Int32 - a 32bit Int implementation for
PolyML 5. It's neither well tested nor efficiently implemented.
*)
structure Int32 :> INTEGER = struct
open Int
val precision = 32
val minInt = ~(IntInf.<< (1, Word.fromInt (precision - 1)))
val maxInt = ~1-minInt
fun check i =
if i < minInt orelse maxInt < i
then raise Overflow
else i
val precision = SOME precision
val minInt = SOME minInt
val maxInt = SOME maxInt
val fromLarge = check o fromLarge
val fromInt = check o fromInt
val ~ = check o ~
val op * = check o op *
val op + = check o op +
val op - = check o op -
val op div = check o op div
val op mod = check o op mod
val quot = check o quot
val rem = check o rem
val abs = check o abs
fun scan' r g s =
case scan r g s
of NONE => NONE
| SOME (i, s) => SOME (check i, s)
val scan = scan'
val fromString = Option.map check o fromString
end;
local
fun convInt s = let
val radix =
if String.size s >= 3 andalso String.substring(s, 0, 2) = "0x"
orelse String.size s >= 4 andalso String.substring(s, 0, 3) = "~0x"
then StringCvt.HEX else StringCvt.DEC
in
case StringCvt.scanString (Int32.scan radix) s of
NONE => raise RunCall.Conversion "Invalid integer constant"
| SOME res => res
end
fun pretty _ _ x = PolyML.PrettyString (Int32.toString x)
in
val () = RunCall.addOverload convInt "convInt"
val () = PolyML.addPrettyPrinter pretty
end;
val () = RunCall.addOverload Int32.~ "~";
val () = RunCall.addOverload Int32.+ "+";
val () = RunCall.addOverload Int32.- "-";
val () = RunCall.addOverload Int32.* "*";
val () = RunCall.addOverload Int32.div "div";
val () = RunCall.addOverload Int32.mod "mod";
val () = RunCall.addOverload Int32.< "<";
val () = RunCall.addOverload Int32.> ">";
val () = RunCall.addOverload Int32.<= "<=";
val () = RunCall.addOverload Int32.>= ">=";
val () = RunCall.addOverload Int32.abs "abs";
|
