Home My Page Projects Code Snippets Project Openings diderot
Summary Activity Tracker Tasks SCM

SCM Repository

[diderot] View of /trunk/src/common/integer-lit.sml
ViewVC logotype

View of /trunk/src/common/integer-lit.sml

Parent Directory Parent Directory | Revision Log Revision Log


Revision 26 - (download) (annotate)
Tue Feb 9 00:43:01 2010 UTC (9 years, 8 months ago) by jhr
File size: 1105 byte(s)
  Working on Diderot parser
(* integer-lit.sml
 *
 * COPYRIGHT (c) 2010 The Diderot Project (http://diderot.cs.uchicago.edu)
 * All rights reserved.
 *)

structure IntegerLit :> sig

    type integer = IntInf.int

  (* range checks *)
    val isInt : integer -> bool		(* representable in 32-bits *)
    val isLong : integer -> bool	(* representable in 64-bits *)

  (* equality, comparisons, and hashing functions *)
    val same : (integer * integer) -> bool
    val compare : (integer * integer) -> order
    val hash : integer -> word

    val toString : integer -> string

  end = struct

    type integer = IntInf.int

  (* range checks *)
    fun isInt (n : IntInf.int) =
	  (~0x80000000 <= n) andalso (n < 0x100000000)
    fun isLong (n : IntInf.int) =
	  (~0x8000000000000000 <= n) andalso (n < 0x10000000000000000)

  (* equality, comparisons, and hashing functions *)
    fun same (a : IntInf.int, b) = (a = b)
    val compare = IntInf.compare
    fun hash i = Word.fromInt(IntInf.toInt(IntInf.andb(i, 0xfffffff)))

    fun toString i = if (i < 0)
	  then "-" ^ IntInf.toString(IntInf.~ i)
	  else IntInf.toString i

  end

root@smlnj-gforge.cs.uchicago.edu
ViewVC Help
Powered by ViewVC 1.0.0