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

Tue Feb 9 00:43:01 2010 UTC (12 years, 4 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)
*)

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
```