# The LearningOnline Network with CAPA
# TeX Conversion Module
#
# $Id: lontexconvert.pm,v 1.15.2.1 2003/03/17 16:52:28 albertel Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA 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 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA 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 LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
# Copyright for TtHfunc and TtMfunc by Ian Hutchinson.
# TtHfunc and TtMfunc (the "Code") may be compiled and linked into
# binary executable programs or libraries distributed by the
# Michigan State University (the "Licensee"), but any binaries so
# distributed are hereby licensed only for use in the context
# of a program or computational system for which the Licensee is the
# primary author or distributor, and which performs substantial
# additional tasks beyond the translation of (La)TeX into HTML.
# The C source of the Code may not be distributed by the Licensee
# to any other parties under any circumstances.
#
# 05/29/00,05/30,10/11,10/20 Gerd Kortemeyer
# 5/4 Gerd Kortemeyer
package Apache::lontexconvert;
use strict;
use tth;
use vars qw($errorstring);
use Apache::lonmsg;
use Apache::lonxml;
# ====================================================================== Header
sub header {
$errorstring='';
my $time=time;
if ($ENV{'browser.mathml'}) {
&tth::ttminit();
if ($ENV{'browser.unicode'}) {
&tth::ttmoptions('-L -u1');
} else {
&tth::ttmoptions('-L -u0');
}
} else {
&tth::tthinit();
if ($ENV{'browser.unicode'}) {
&tth::tthoptions('-L -u1');
} else {
&tth::tthoptions('-L -u0');
}
}
return &Apache::lonxml::xmlbegin().
&Apache::lonxml::fontsettings().
"\n<head>\n".
&Apache::lonxml::registerurl(undef,'tex').
"\n</head>\n";
}
# ================================================================== Conversion
sub converted {
my $texstring=shift;
my $xmlstring='[UNDISPLAYABLE]';
eval(<<'ENDCONV');
{
local $SIG{SEGV}=sub { die; };
if ($ENV{'browser.mathml'}) {
$xmlstring=&tth::ttm($$texstring);
$xmlstring=~s/\<math\>/\<math xmlns=\"\&mathns\;\"\>/g;
$xmlstring=~s/\<br\>/\<br\/\>/g;
$xmlstring=~s/\<p\>/\<p\>\<\/p\>/g;
$errorstring.=&tth::ttmerror();
} else {
$xmlstring=&tth::tth($$texstring);
$errorstring.=&tth::ttherror();
}
}
ENDCONV
return $xmlstring;
}
# ====================================================================== Footer
sub footer {
my $xmlstring='';
if ($ENV{'request.state'} eq 'construct') {
$xmlstring.='<address>'.$errorstring.'</address>';
} else {
&Apache::lonmsg::author_res_msg($ENV{'request.filename'},$errorstring);
}
# -------------------------------------------------------------------- End Body
$xmlstring.=&Apache::lonxml::xmlend();
return $xmlstring;
}
# ------------------------------------------------------------ Message display
sub to_convert {
my ($string) = @_;
$string=~s/\<br\s*\/?\>/ /g;
$string=&HTML::Entities::decode($string);
return &converted(\$string);
}
sub msgtexconverted {
my $message=shift;
if ($ENV{'browser.mathml'}) {
&tth::ttminit();
if ($ENV{'browser.unicode'}) {
&tth::ttmoptions('-L -u1');
} else {
&tth::ttmoptions('-L -u0');
}
} else {
&tth::tthinit();
if ($ENV{'browser.unicode'}) {
&tth::tthoptions('-L -u1');
} else {
&tth::tthoptions('-L -u0');
}
}
$message=~s/(\$\$.+?\$\$)/&to_convert($1)/ge;
$message=~s/(\$.+?\$)/&to_convert($1)/ge;
$message=~s/(\\\(.+?\\\))/&to_convert($1)/ge;
$message=~s/(\\\[.+?\\\])/&to_convert($1)/ge;
return $message.$errorstring;
}
1;
__END__
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