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(*
Title: Standard Basis Library: SML90 Signature and Structure
Author: David Matthews
Copyright David Matthews 1999
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
*)
(* G&R 2004 status: This structure and signature are not listed and should be avoided in new code. *)
signature SML90 =
sig
exception Abs
exception Quot
exception Prod
exception Neg
exception Sum
exception Diff
exception Floor
exception Exp
exception Sqrt
exception Ln
exception Ord
exception Mod
exception Io of string
exception Interrupt
val sqrt : real -> real
val exp : real -> real
val ln : real -> real
val sin : real -> real
val cos : real -> real
val arctan : real -> real
val ord : string -> int
val chr : int -> string
val explode : string -> string list
val implode : string list -> string
type instream
type outstream
val std_in : instream
val std_out : outstream
val open_in : string -> instream
val input : instream * int -> string
val lookahead : instream -> string
val close_in : instream -> unit
val end_of_stream : instream -> bool
val open_out : string -> outstream
val output : outstream * string -> unit
val close_out : outstream -> unit
end;
structure SML90 :> SML90 =
struct
exception Abs = Overflow and Quot = Overflow and Prod = Overflow
and Neg = Overflow and Sum = Overflow and Diff = Overflow
and Floor = Overflow and Exp = Overflow and Sqrt = Overflow
and Ln = Overflow and Ord = Overflow and Mod = Div
local
structure Interrupt =
RunCall.Run_exception0( val ex_iden = RuntimeCalls.EXC_interrupt )
in
exception Interrupt = Interrupt.ex
end
exception Io of string
fun sqrt x = if x < 0.0 then raise Sqrt else Real.Math.sqrt x
fun exp x = let val r = Real.Math.exp x in if Real.isFinite r then r else raise Exp end
fun ln x = if x < 0.0 then raise Ln else Real.Math.ln x
val sin = Real.Math.sin and cos = Real.Math.cos and arctan = Real.Math.atan
fun ord "" = raise Ord | ord s = Char.ord(String.sub(s, 0))
fun chr i = str(Char.chr i)
(* Because single character strings are represented by the characters
themselves we just need to coerce String.explode. *)
val explode: string -> string list = RunCall.unsafeCast(String.explode)
val implode = String.concat
type instream = TextIO.instream and outstream = TextIO.outstream
val std_in : instream = TextIO.stdIn and std_out : outstream = TextIO.stdOut
fun open_in s = TextIO.openIn s handle _ => raise Io "Cannot open"
and open_out s = TextIO.openOut s handle _ => raise Io "Cannot open"
fun input(str, i) = TextIO.inputN(str, i) handle _ => raise Io "Cannot read"
fun lookahead strm =
case TextIO.lookahead strm of
NONE => ""
| SOME ch => str ch
val close_in : instream -> unit = TextIO.closeIn
and close_out : outstream -> unit = TextIO.closeOut
fun output(str, s) = TextIO.output(str, s) handle _ => raise Io "Cannot output"
val end_of_stream = TextIO.endOfStream
end;
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