411 REFERENCE · Wikibooks
Oberon/V5/Out1.Mod
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(* Oberon, Copyright 2001 ETH Zuerich Institut fuer Computersysteme, ETH Zentrum, CH-8092 Zuerich.
Refer to the "General ETH Oberon System Source License" contract available at: http://www.oberon.ethz.ch/ *)
MODULE Out; (** portable *) (* based on module from "Programming in Oberon" *)
(** Simple output routines for writing text into the Oberon log or a separate viewer. *)
IMPORT Texts, Viewers, Oberon, MenuViewers, TextFrames;
CONST
StandardMenu = "System.Close System.Copy System.Grow Edit.Search Edit.Store";
TYPE Appender = PROCEDURE();
VAR T: Texts.Text; W: Texts.Writer; Append: Appender;
PROCEDURE TA(); BEGIN Texts.Append(T, W.buf) END TA;
PROCEDURE AppendImmediate*(); BEGIN Append := TA END AppendImmediate;
PROCEDURE Null(); BEGIN END Null;
PROCEDURE AppendDelayed*(); BEGIN Append := Null END AppendDelayed;
(** Write character. *)
PROCEDURE Char*(ch: CHAR);
BEGIN
Texts.Write(W, ch); Append()
END Char;
(** Write a string. *)
PROCEDURE String*(str: ARRAY OF CHAR);
BEGIN
Texts.WriteString(W, str); Append()
END String;
(** Write the integer i in n field positions. *)
PROCEDURE Int*(i, n: LONGINT);
BEGIN
Texts.WriteInt(W, i, n); Append()
END Int;
(** Write the integer i in hexadecimal with a leading space. *)
PROCEDURE Hex*(i: LONGINT);
BEGIN
Texts.WriteHex(W, i); Append()
END Hex;
(** Write the real x in n field positions. *)
PROCEDURE Real*(x: REAL; n: INTEGER);
BEGIN
Texts.WriteReal(W, x, n); Append()
END Real;
(** Write the real x in n field positions in fixed point notation with f fraction digits. *)
PROCEDURE RealFix*(x: REAL; n, f: INTEGER);
BEGIN
Texts.WriteRealFix(W, x, n, f); Append()
END RealFix;
(** Write the longreal x in n field positions. *)
PROCEDURE LongReal*(x: LONGREAL; n: INTEGER);
BEGIN
Texts.WriteReal(W, x, n); Append()
END LongReal;
(** Write the longreal x in n field positions in fixed point notation with f fraction digits. *)
PROCEDURE LongRealFix*(x: LONGREAL; n, f: INTEGER);
BEGIN
Texts.WriteRealFix(W, x, n, f); Append()
END LongRealFix;
(** Write a carriage return (CR or end-of-line). *)
PROCEDURE Ln*;
BEGIN
Texts.WriteLn(W); Texts.Append(T, W.buf)
END Ln;
(** Open a separate viewer for output. *)
PROCEDURE Open*;
VAR V: Viewers.Viewer;
X, Y: INTEGER;
BEGIN
IF T = Oberon.Log THEN NEW(T); Texts.Open(T, "") END;
Oberon.AllocateUserViewer(400, X, Y);
(*
Oberon.OpenText("Out.Text", T, 400, 200)
*)
V := MenuViewers.New(
TextFrames.NewMenu("Out.Text", StandardMenu),
TextFrames.NewText(T, 0),
TextFrames.menuH, X, Y)
END Open;
(** Revert output to the system log. *)
PROCEDURE Close*;
BEGIN
T := Oberon.Log
END Close;
BEGIN
Texts.OpenWriter(W); T := Oberon.Log; AppendDelayed()
END Out.
(** Remarks:
1. Out uses a Writer from module Texts to write output to the log.
After AppendImmediate(), Out is slow because the log is updated after
every procedure call. After AppendDelayed(), updating is delayed to
the end of the line and performance is better. Best performance is
when Texts is used directly.
2. Out.Open creates a new text and viewer for output. Once this is
done, output can be sent to the system log again by executing Close.
*)