(* Title: Pure/ML-Systems/mosml.ML
ID: $Id$
Author: Lawrence C Paulson, Cambridge University Computer Laboratory
Copyright 1999 University of Cambridge
Compatibility file for Moscow ML 2.00
NOTE: saving images does not work (yet!?), may run it interactively as follows:
$ cd .../Pure
$ isabelle RAW_ML_SYSTEM
> val ml_system = "mosml";
> use "ML-Systems/mosml.ML";
> use "ROOT.ML";
*)
(** ML system related **)
(* Poly/ML emulation *)
load "Bool";
load "Int";
load "Real";
load "ListPair";
load "OS";
load "Process";
load "FileSys";
structure OS =
struct
open OS
structure Process = Process
structure FileSys = FileSys
end;
(*To exit the system with an exit code -- an alternative to ^D *)
fun exit 0 = Process.exit Process.success
| exit _ = Process.exit Process.failure;
(*limit the printing depth*)
fun print_depth n =
(Meta.printDepth := n div 2;
Meta.printLength := n);
(*interface for toplevel pretty printers, see also Pure/install_pp.ML*)
(*the documentation refers to an installPP but I couldn't fine it!*)
fun make_pp path pprint = ();
fun install_pp _ = ();
(*prompts*)
(*n.a.??*)
fun ml_prompts p1 p2 = ();
(** Compiler-independent timing functions **)
load "Timer";
(*Note start point for timing*)
fun startTiming() =
let val CPUtimer = Timer.startCPUTimer();
val time = Timer.checkCPUTimer(CPUtimer)
in (CPUtimer,time) end;
(*Finish timing and return string*)
fun endTiming (CPUtimer, {gc,sys,usr}) =
let open Time (*...for Time.toString, Time.+ and Time.- *)
val {gc=gc2,sys=sys2,usr=usr2} = Timer.checkCPUTimer(CPUtimer)
in "User " ^ toString (usr2-usr) ^
" GC " ^ toString (gc2-gc) ^
" All "^ toString (sys2-sys + usr2-usr + gc2-gc) ^
" secs"
handle Time => ""
end;
(* ML command execution *)
(*Can one redirect 'use' directly to an instream?*)
fun use_text _ _ txt =
let
val tmp_name = FileSys.tmpName ();
val tmp_file = TextIO.openOut tmp_name;
in
TextIO.output (tmp_file, txt);
TextIO.closeOut tmp_file;
use tmp_name;
FileSys.remove tmp_name
end;
(** interrupts **) (*Note: may get into race conditions*)
(* FIXME proper implementation available? *)
exception Interrupt;
fun mask_interrupt f x = f x;
fun unmask_interrupt f x = f x;
fun exhibit_interrupt f x = f x;
(** OS related **)
(* system command execution *)
(*execute Unix command which doesn't take any input from stdin and
sends its output to stdout; could be done more easily by Unix.execute,
but that function doesn't use the PATH*)
fun execute command =
let
val tmp_name = FileSys.tmpName ();
val is = (Process.system (command ^ " > " ^ tmp_name); TextIO.openIn
tmp_name);
val result = TextIO.inputAll is;
in
TextIO.closeIn is;
FileSys.remove tmp_name;
result
end;
(*plain version; with return code*)
fun system cmd =
if Process.system cmd = Process.success then 0 else 1;
(* file handling *)
(*get time of last modification*)
fun file_info name = Time.toString (FileSys.modTime name) handle _ => "";
(* getenv *)
fun getenv var =
(case Process.getEnv var of
NONE => ""
| SOME txt => txt);
(* non-ASCII input (see also Thy/use.ML) *)
val needs_filtered_use = false;