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(* Output.mod redirect output.
Copyright (C) 2021-2023 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
This file is part of GNU Modula-2.
GNU Modula-2 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Modula-2 is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Modula-2; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. *)
IMPLEMENTATION MODULE Output ;
IMPORT FIO, SFIO ;
FROM StrLib IMPORT StrEqual ;
FROM NameKey IMPORT KeyToCharStar, Name ;
FROM NumberIO IMPORT CardToStr ;
FROM ASCII IMPORT nl ;
FROM DynamicStrings IMPORT KillString, InitStringCharStar, ConCatChar,
ConCat, InitString, Mark ;
VAR
stdout: BOOLEAN ;
outputFile: FIO.File ;
buffer : String ;
(*
Open - attempt to open filename as the output file.
TRUE is returned if success, FALSE otherwise.
*)
PROCEDURE Open (filename: ARRAY OF CHAR) : BOOLEAN ;
BEGIN
IF StrEqual (filename, "<stdout>") OR StrEqual (filename, "-")
THEN
outputFile := FIO.StdOut ;
stdout := TRUE ;
RETURN TRUE
ELSE
outputFile := FIO.OpenToWrite (filename) ;
stdout := FALSE ;
RETURN FIO.IsNoError (outputFile)
END
END Open ;
(*
Close - close the output file.
*)
PROCEDURE Close ;
BEGIN
FIO.Close (outputFile)
END Close ;
(*
Write - write a single character to the output file.
*)
PROCEDURE Write (ch: CHAR) ;
BEGIN
IF buffer = NIL
THEN
FIO.WriteChar (outputFile, ch)
ELSE
buffer := ConCatChar (buffer, ch)
END
END Write ;
(*
WriteString - write an unformatted string to the output.
*)
PROCEDURE WriteString (s: ARRAY OF CHAR) ;
BEGIN
IF buffer = NIL
THEN
FIO.WriteString (outputFile, s)
ELSE
buffer := ConCat (buffer, Mark (InitString (s)))
END
END WriteString ;
(*
KillWriteS - write a string to the output and free the string afterwards.
*)
PROCEDURE KillWriteS (s: String) ;
BEGIN
IF KillString (SFIO.WriteS (outputFile, s)) = NIL
THEN
END
END KillWriteS ;
(*
WriteS - write a string to the output. The string is not freed.
*)
PROCEDURE WriteS (s: String) ;
BEGIN
IF SFIO.WriteS (outputFile, s) = s
THEN
END
END WriteS ;
(*
WriteKey - write a key to the output.
*)
PROCEDURE WriteKey (key: Name) ;
BEGIN
IF buffer = NIL
THEN
KillWriteS (InitStringCharStar (KeyToCharStar (key)))
ELSE
buffer := ConCat (buffer, Mark (InitStringCharStar (KeyToCharStar (key))))
END
END WriteKey ;
(*
WriteLn - write a newline to the output.
*)
PROCEDURE WriteLn ;
BEGIN
IF buffer = NIL
THEN
FIO.WriteLine (outputFile)
ELSE
Write (nl)
END
END WriteLn ;
(*
WriteCard - write a cardinal using fieldlength characters.
*)
PROCEDURE WriteCard (card, fieldlength: CARDINAL) ;
VAR
s: ARRAY [0..20] OF CHAR ;
BEGIN
CardToStr (card, fieldlength, s) ;
WriteString (s)
END WriteCard ;
(*
StartBuffer - create a buffer into which any output is redirected.
*)
PROCEDURE StartBuffer ;
BEGIN
IF buffer # NIL
THEN
buffer := KillString (buffer)
END ;
buffer := InitString ('')
END StartBuffer ;
(*
EndBuffer - end the redirection and return the contents of the buffer.
*)
PROCEDURE EndBuffer () : String ;
VAR
s: String ;
BEGIN
s := buffer ;
buffer := NIL ;
RETURN s
END EndBuffer ;
BEGIN
stdout := TRUE ;
buffer := NIL ;
outputFile := FIO.StdOut ;
END Output.
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