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From: mattes@azu.informatik.uni-stuttgart.de (Eberhard Mattes)
Newsgroups: comp.text.tex
Subject: Re: Problem with TeX character codes
Message-ID: <MATTES.91Feb8145208@azu.informatik.uni-stuttgart.de>
Date: 8 Feb 91 13:52:08 GMT
References: <1991Feb7.112203.12456@polaris.utu.fi>
Sender: news@ifistg.uucp
Organization: IfI, Univ. Stuttgart, W Germany
Lines: 49
In-reply-to: knuutila@tucos.utu.fi's message of 7 Feb 91 11:22:03 GMT

Timo Knuutila wrote:

> I have a scandinavian keyboard with special keys for the accented scandinavian
> letters (\"a, \"o, \"A, \"O, \aa, \AA) and I'm trying to map these to the
> corresponding PostScript character codes. In what follows, suppose that
> x, y, X and Y stand for the characters of a-, o-, A- and O-umlaut,
> respectively.

Here's a file which I used for testing. It tries to work correctly even
with circular references like
  A -> B
  B -> A
which will cause an infinite loop or both A and B being replaced with B (eg)
if a simpler method were used. The method below should work correctly
with \hyphenation and \write.

----------------------------- test.tex --------------------------------------
{\catcode`^^e3\active \global\let^^e3=^^e4}
{\catcode`^^e4\active \global\let^^e4=^^e3}
% more redefinitions

\catcode`^^e3\active
\catcode`^^e4\active
% more active characters


% for \hyphenation
\lccode`^^e4=`^^e4

% this should print ^^e3^^e4
\message{^^e3^^e4}

% this shouldn't give an error message
\hyphenation{^^e3-a}

% this should write ^^e4 to test.aux
\openout1 test.aux
\write1{^^e4}
\closeout1

% this should write ^^e4^^e3 to test.dvi
\font\tendmr=dmr10
\tendmr
^^e3^^e4

\bye
--------------------------end of test.tex ------------------------------------
--
    Eberhard Mattes (mattes@azu.informatik.uni-stuttgart.de)