--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Pure/ML-Systems/mosml.ML Thu Jul 06 00:09:45 2000 +0200
@@ -0,0 +1,147 @@
+(* 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;