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(* TextIO.mod implement the ISO TextIO specification.
Copyright (C) 2008-2023 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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. *)
IMPLEMENTATION MODULE TextIO ;
IMPORT IOChan, IOConsts, CharClass, ASCII ;
FROM SYSTEM IMPORT ADR ;
FROM FIO IMPORT FlushOutErr ;
FROM libc IMPORT printf ;
FROM TextUtil IMPORT SkipSpaces, EofOrEoln, CharAvailable ;
CONST
DebugState = FALSE ;
(*
DumpState
*)
PROCEDURE DumpState (cid: IOChan.ChanId) ;
BEGIN
printf ("cid = %d, ", cid) ;
CASE IOChan.ReadResult (cid) OF
IOConsts.notKnown: printf ('notKnown') |
IOConsts.allRight: printf ('allRight') |
IOConsts.outOfRange: printf ('outOfRange') |
IOConsts.wrongFormat: printf ('wrongFormat') |
IOConsts.endOfLine: printf ('endOfLine') |
IOConsts.endOfInput: printf ('endOfInput')
END ;
printf ("\n")
END DumpState ;
(*
SetNul - assigns the result in cid.
If s is empty then leave as endOfInput
or endOfLine
If s is not empty then assign allRight
If range and i exceeds, h, then assign outOfRange
*)
PROCEDURE SetNul (cid: IOChan.ChanId; i: CARDINAL;
VAR s: ARRAY OF CHAR; range: BOOLEAN) ;
BEGIN
IF DebugState
THEN
DumpState (cid)
END ;
IF i<=HIGH(s)
THEN
s[i] := ASCII.nul
ELSIF range
THEN
IOChan.SetReadResult (cid, IOConsts.outOfRange)
END
END SetNul ;
PROCEDURE ReadChar (cid: IOChan.ChanId; VAR ch: CHAR);
(* If possible, removes a character from the input stream
cid and assigns the corresponding value to ch. The
read result is set to the value allRight, endOfLine, or
endOfInput.
*)
VAR
res: IOConsts.ReadResults ;
BEGIN
FlushOutErr ;
IF CharAvailable (cid)
THEN
IOChan.Look (cid, ch, res) ;
IF res = IOConsts.allRight
THEN
IOChan.Skip (cid)
END
END
END ReadChar ;
PROCEDURE ReadRestLine (cid: IOChan.ChanId; VAR s: ARRAY OF CHAR);
(* Removes any remaining characters from the input stream
cid before the next line mark, copying to s as many as
can be accommodated as a string value. The read result is
set to the value allRight, outOfRange, endOfLine, or
endOfInput.
*)
VAR
i, h : CARDINAL ;
finished: BOOLEAN ;
BEGIN
h := HIGH(s) ;
i := 0 ;
finished := FALSE ;
WHILE (i<=h) AND CharAvailable (cid) AND (NOT finished) DO
ReadChar (cid, s[i]) ;
IF EofOrEoln (cid)
THEN
finished := TRUE
ELSE
INC (i)
END
END ;
WHILE CharAvailable (cid) DO
IOChan.Skip (cid)
END ;
SetNul (cid, i, s, TRUE)
END ReadRestLine ;
PROCEDURE ReadString (cid: IOChan.ChanId; VAR s: ARRAY OF CHAR);
(* Removes only those characters from the input stream cid
before the next line mark that can be accommodated in s
as a string value, and copies them to s. The read result
is set to the value allRight, endOfLine, or endOfInput.
*)
VAR
i, h : CARDINAL ;
finished: BOOLEAN ;
BEGIN
h := HIGH (s) ;
i := 0 ;
finished := FALSE ;
WHILE (i<=h) AND CharAvailable (cid) AND (NOT finished) DO
ReadChar (cid, s[i]) ;
IF EofOrEoln (cid)
THEN
finished := TRUE
ELSE
INC (i)
END
END ;
SetNul (cid, i, s, FALSE)
END ReadString ;
PROCEDURE ReadToken (cid: IOChan.ChanId; VAR s: ARRAY OF CHAR);
(* Skips leading spaces, and then removes characters from
the input stream cid before the next space or line mark,
copying to s as many as can be accommodated as a string
value. The read result is set to the value allRight,
outOfRange, endOfLine, or endOfInput.
*)
VAR
i, h: CARDINAL ;
BEGIN
SkipSpaces (cid) ;
h := HIGH (s) ;
i := 0 ;
WHILE (i<=h) AND CharAvailable (cid) DO
ReadChar (cid, s[i]) ;
IF (s[i]=ASCII.nul) OR CharClass.IsWhiteSpace (s[i])
THEN
SetNul (cid, i, s, TRUE) ;
RETURN
END ;
INC (i)
END ;
SetNul (cid, i, s, TRUE)
END ReadToken ;
(* The following procedure reads past the next line mark *)
PROCEDURE SkipLine (cid: IOChan.ChanId);
(* Removes successive items from the input stream cid up
to and including the next line mark, or until the end
of input is reached. The read result is set to the
value allRight, or endOfInput.
*)
VAR
ch : CHAR ;
res: IOConsts.ReadResults ;
BEGIN
IOChan.Look (cid, ch, res) ;
WHILE res = IOConsts.allRight DO
IOChan.SkipLook (cid, ch, res)
END ;
IF res = IOConsts.endOfLine
THEN
IOChan.Skip (cid) ;
IOChan.SetReadResult (cid, IOConsts.allRight)
END
END SkipLine ;
(* Output procedures *)
PROCEDURE WriteChar (cid: IOChan.ChanId; ch: CHAR);
(* Writes the value of ch to the output stream cid. *)
BEGIN
IOChan.TextWrite (cid, ADR (ch), SIZE (ch))
END WriteChar ;
PROCEDURE WriteLn (cid: IOChan.ChanId);
(* Writes a line mark to the output stream cid. *)
BEGIN
IOChan.WriteLn (cid)
END WriteLn ;
PROCEDURE WriteString (cid: IOChan.ChanId; s: ARRAY OF CHAR);
(* Writes the string value in s to the output stream cid. *)
BEGIN
IOChan.TextWrite (cid, ADR (s), LENGTH (s))
END WriteString ;
END TextIO.
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