--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Pure/ML-Systems/polyml-3.x.ML Mon Feb 05 14:37:10 2001 +0100
@@ -0,0 +1,136 @@
+(* Title: Pure/ML-Systems/polyml.ML
+ ID: $Id$
+ Author: Lawrence C Paulson, Cambridge University Computer Laboratory
+ Copyright 1991 University of Cambridge
+
+Compatibility file for Poly/ML (versions 2.x and 3.x).
+*)
+
+open PolyML ExtendedIO;
+
+(*needs the Basis Library emulation*)
+use "basis.ML";
+
+
+structure String =
+struct
+ fun substring (s,i,j) = StringBuiltIns.substring (s, i+1, j)
+ handle Substring => raise Subscript
+ fun isPrefix s1 s2 = (s1 = substring(s2,0, size s1))
+ handle Subscript => false
+end;
+
+
+(** ML system related **)
+
+(** Compiler-independent timing functions **)
+
+(*Note start point for timing*)
+fun startTiming() = System.processtime ();
+
+(*Finish timing and return string*)
+fun endTiming before =
+ "User + GC: " ^
+ makestring (real (System.processtime () - before) / 10.0) ^
+ " secs";
+
+
+(* prompts *)
+
+fun ml_prompts p1 p2 = (PolyML.Compiler.prompt1 := p1; PolyML.Compiler.prompt2 := p2);
+
+
+(* toplevel pretty printing (see also Pure/install_pp.ML) *)
+
+fun make_pp _ pprint (str, blk, brk, en) obj =
+ pprint obj (str, fn ind => blk (ind, false), fn wd => brk (wd, 0),
+ fn () => brk (99999, 0), en);
+
+
+(* ML command execution -- 'eval' *)
+
+local
+
+fun drop_last [] = []
+ | drop_last [x] = []
+ | drop_last (x :: xs) = x :: drop_last xs;
+
+val drop_last_char = implode o drop_last o explode;
+
+in
+
+fun use_text (print, err) verbose txt =
+ let
+ val in_buffer = ref (explode txt);
+ val out_buffer = ref ([]: string list);
+ fun output () = drop_last_char (implode (rev (! out_buffer)));
+
+ fun get () =
+ (case ! in_buffer of
+ [] => ""
+ | c :: cs => (in_buffer := cs; c));
+ fun put s = out_buffer := s :: ! out_buffer;
+
+ fun exec () =
+ (case ! in_buffer of
+ [] => ()
+ | _ => (PolyML.compiler (get, put) (); exec ()));
+ in
+ exec () handle exn => (err (output ()); raise exn);
+ if verbose then print (output ()) else ()
+ end;
+
+
+
+(** interrupts **) (*Note: may get into race conditions*)
+
+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*)
+fun execute command =
+ let
+ val (is, os) = ExtendedIO.execute command;
+ val _ = close_out os;
+ val result = input (is, 999999);
+ in close_in is; result end;
+
+fun system cmd = (print (execute cmd); 0); (* FIXME rc not available *)
+
+
+(* file handling *)
+
+(*get time of last modification*)
+fun file_info name = Int.toString (System.filedate name) handle _ => "";
+
+structure OS =
+struct
+ structure FileSys =
+ struct
+ val chDir = PolyML.cd;
+ fun remove name = (execute ("rm " ^ name); ());
+ fun getDir () = drop_last_char (execute "pwd");
+ end;
+end;
+
+
+(* getenv *)
+
+fun getenv var = drop_last_char
+ (execute ("env | grep '^" ^ var ^ "=' | sed -e 's/" ^ var ^ "=//'"));
+
+
+end;
+
+
+(* non-ASCII input (see also Thy/use.ML) *)
+
+val needs_filtered_use = true;