(*  Title:      Pure/ML-Systems/polyml.ML

Compatibility wrapper for experimental versions of Poly/ML after 5.2.1.

*)

open Thread;

structure ML_Name_Space =

struct

  open PolyML.NameSpace;

  type T = PolyML.NameSpace.nameSpace;

  val global = PolyML.globalNameSpace;

end;

use "ML-Systems/polyml_common.ML";

use "ML-Systems/multithreading_polyml.ML";

val pointer_eq = PolyML.pointerEq;

fun share_common_data () = PolyML.shareCommonData PolyML.rootFunction;

(* runtime compilation *)

local

fun drop_newline s =

  if String.isSuffix "\n" s then String.substring (s, 0, size s - 1)

  else s;

in

fun use_text ({tune_source, name_space, str_of_pos, print, error, ...}: use_context)

    (start_line, name) verbose txt =

  let

    val current_line = ref start_line;

    val in_buffer = ref (String.explode (tune_source txt));

    val out_buffer = ref ([]: string list);

    fun output () = drop_newline (implode (rev (! out_buffer)));

    fun get () =

      (case ! in_buffer of

        [] => NONE

      | c :: cs =>

          (in_buffer := cs; if c = #"\n" then current_line := ! current_line + 1 else (); SOME c));

    fun put s = out_buffer := s :: ! out_buffer;

    fun put_message {message = msg1, hard, location = {startLine = line, ...}, context} =

     (put (if hard then "Error: " else "Warning: ");

      PolyML.prettyPrint (put, 76) msg1;

      (case context of NONE => () | SOME msg2 => PolyML.prettyPrint (put, 76) msg2);

      put ("At" ^ str_of_pos line name ^ "\n"));

    val parameters =

     [PolyML.Compiler.CPOutStream put,

      PolyML.Compiler.CPLineNo (fn () => ! current_line),

      PolyML.Compiler.CPErrorMessageProc put_message,

      PolyML.Compiler.CPNameSpace name_space,

      PolyML.Compiler.CPPrintInAlphabeticalOrder false];

    val _ =

      (while not (List.null (! in_buffer)) do

        PolyML.compiler (get, parameters) ())

      handle exn =>

       (put ("Exception- " ^ General.exnMessage exn ^ " raised");

        error (output ()); raise exn);

  in if verbose then print (output ()) else () end;

fun use_file context verbose name =

  let

    val instream = TextIO.openIn name;

    val txt = Exn.release (Exn.capture TextIO.inputAll instream before TextIO.closeIn instream);

  in use_text context (1, name) verbose txt end;

end;

(* toplevel pretty printing *)

val pretty_ml =

  let

    fun convert len (PrettyBlock (ind, _, context, prts)) =

          let

            fun property name default =

              (case List.find (fn ContextProperty (a, _) => name = a | _ => false) context of

                SOME (ContextProperty (_, b)) => b

              | NONE => default);

            val bg = property "begin" "";

            val en = property "end" "";

            val len' = property "length" len;

          in ML_Pretty.Block ((bg, en), map (convert len') prts, ind) end

      | convert len (PrettyString s) =

          ML_Pretty.String (s, case Int.fromString len of SOME i => i | NONE => size s)

      | convert _ (PrettyBreak (wd, _)) =

          ML_Pretty.Break (if wd < 99999 then (false, wd) else (true, 2));

  in convert "" end;

fun ml_pretty (ML_Pretty.Block ((bg, en), prts, ind)) =

      let val context =

        (if bg = "" then [] else [ContextProperty ("begin", bg)]) @

        (if en = "" then [] else [ContextProperty ("end", en)])

      in PrettyBlock (ind, false, context, map ml_pretty prts) end

  | ml_pretty (ML_Pretty.String (s, len)) =

      if len = size s then PrettyString s

      else PrettyBlock (0, false, [ContextProperty ("length", Int.toString len)], [PrettyString s])

  | ml_pretty (ML_Pretty.Break (false, wd)) = PrettyBreak (wd, 0)

  | ml_pretty (ML_Pretty.Break (true, _)) = PrettyBreak (99999, 0);

fun toplevel_pp context (_: string list) pp =

  use_text context (1, "pp") false

    ("addPrettyPrinter (fn _ => fn _ => ml_pretty o Pretty.to_ML o (" ^ pp ^ "))");