src/Pure/MLWorks.ML
author nipkow
Fri Mar 14 10:35:30 1997 +0100 (1997-03-14)
changeset 2792 6c17c5ec3d8b
parent 2723 f09ecc2cd3f1
permissions -rw-r--r--
Avoid eta-contraction in the simplifier.
Instead the net needs to eta-contract the object.
Also added a special function loose_bvar1(i,t) in term.ML.
     1 (*  Title:      Pure/MLWorks.ML
     2     ID:         $Id$
     3     Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
     4     Copyright   1996  University of Cambridge
     5 
     6 Compatibility file for MLWorks (??)
     7 
     8 NB: There is still no easy way of building Isabelle under MLWorks.  This file
     9     is just a start towards compatibility.  One problem is the peculiar
    10     behaviour of "use" in MLWorks.  Strange errors occur when loading theories,
    11     and ROOT.ML files on subdirectories are loaded incorrectly.
    12 *)
    13 
    14 (*** Poly/ML emulation ***)
    15 
    16 (**
    17 Shell.File.loadSource "system.__os";
    18 Shell.File.loadSource "basis.__timer";
    19 Shell.File.loadSource "system.__time";
    20 Shell.File.loadSource "unix.__os_file_sys";
    21 Shell.File.loadSource "basis.__list";
    22 Shell.File.loadSource "basis.__char";
    23 Shell.File.loadSource "basis.__string";
    24 Shell.File.loadSource "basis.__text_io";
    25 **)
    26 
    27 
    28 (*To exit the system with an exit code -- an alternative to ^D *)
    29 fun exit 0 = OS.Process.exit OS.Process.success
    30   | exit _ = OS.Process.exit OS.Process.failure;
    31 fun quit () = exit 0;
    32 
    33 (*To limit the printing depth [divided by 2 for comparibility with Poly/ML]*)
    34 fun print_depth n = ();
    35 
    36 (*Interface for toplevel pretty printers, see also Pure/install_pp.ML
    37   CURRENTLY UNAVAILABLE*)
    38 fun make_pp path pprint = ();
    39 fun install_pp _ = ();
    40 
    41 
    42 (*** New Jersey ML parameters ***)
    43 
    44 (*** Character/string functions which are compatible with 0.93 and Poly/ML ***)
    45 
    46 fun ord s = Char.ord (String.sub(s,0));
    47 val chr = str o Char.chr;
    48 val explode = (map str) o String.explode;
    49 val implode = String.concat;
    50 
    51 
    52 (*** Timing functions ***)
    53 
    54 (*A conditional timing function: applies f to () and, if the flag is true,
    55   prints its runtime. *)
    56 fun cond_timeit flag f =
    57   if flag then
    58     let open Time  (*...for Time.toString, Time.+ and Time.- *)
    59 	val CPUtimer = Timer.startCPUTimer();
    60         val {gc=gct1,sys=syst1,usr=usrt1} = Timer.checkCPUTimer(CPUtimer);
    61         val result = f();
    62         val {gc=gct2,sys=syst2,usr=usrt2} = Timer.checkCPUTimer(CPUtimer)
    63     in  print("User " ^ toString (usrt2-usrt1) ^
    64               "  GC " ^ toString (gct2-gct1) ^
    65               "  All "^ toString (syst2-syst1 + usrt2-usrt1 + gct2-gct1) ^
    66               " secs\n")
    67 	  handle Time => ();
    68         result
    69     end
    70   else f();
    71 
    72 
    73 (*** File handling ***)
    74 
    75 (*Get time of last modification; if file doesn't exist return an empty string*)
    76 fun file_info "" = ""
    77   | file_info name = Time.toString (OS.FileSys.modTime name) handle _ =>"";
    78 
    79 
    80 (*** ML command execution ***)
    81 
    82 val tmpName = OS.FileSys.tmpName();
    83 
    84 (*Can one redirect 'use' directly to an instream?*)
    85 fun use_string slist =
    86   let val tmpFile = TextIO.openOut tmpName
    87   in app (fn s => TextIO.output (tmpFile, s)) slist;
    88      TextIO.closeOut tmpFile;
    89      use tmpName
    90   end;
    91 
    92 
    93 (*** System command execution ***)
    94 
    95 (*Execute an Unix command which doesn't take any input from stdin and
    96   sends its output to stdout.
    97   This could be done more easily by Unix.execute, but that function
    98   doesn't use the PATH.*)
    99 fun execute command =
   100   let val is = (OS.Process.system (command ^ " > " ^ tmpName);
   101                 TextIO.openIn tmpName);
   102       val result = TextIO.inputAll is;
   103   in TextIO.closeIn is;
   104      OS.FileSys.remove tmpName;
   105      result
   106   end;
   107 
   108 
   109 (*Don't know what the boolean is for*)
   110 fun xML filename = Shell.saveImage (filename, false);
   111 
   112 
   113 (*Non-printing and 8-bit chars are forbidden in string constants*)
   114 val needs_filtered_use = true;
   115