# The LearningOnline Network with CAPA
# TeX Conversion Module
#
# $Id: lontexconvert.pm,v 1.47 2005/02/24 05:33:55 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.
#
package Apache::lontexconvert;
use strict;
use tth();
use vars qw($errorstring);
use Apache();
use Apache::lonmsg();
use Apache::lonxml();
use Apache::lonmenu();
use Apache::lonlocal;
# ====================================================================== Header
sub init_tth {
my $options=$ENV{'course.'.$ENV{'request.course.id'}.'.tthoptions'};
if ($ENV{'browser.mathml'}) {
&tth::ttminit();
if ($ENV{'browser.unicode'}) {
&tth::ttmoptions('-L -u1 '.$options);
} else {
&tth::ttmoptions('-L -u0 '.$options);
}
} else {
&tth::tthinit();
if ($ENV{'browser.unicode'}) {
&tth::tthoptions('-L -u1 '.$options);
} else {
&tth::tthoptions('-L -u0 '.$options);
}
}
}
sub header {
$errorstring='';
my $time=time;
&init_tth();
return &Apache::lonxml::xmlbegin().
"\n<head>\n".
&Apache::lonxml::fontsettings().
&Apache::lonmenu::registerurl(undef,'tex').
"\n</head>\n";
}
# ================================================================== Conversion
$Apache::lontexconvert::messedup=0;
# we need this routine because &converted can get called from inside
# of the safespace (through &xmlparse('<m>stuff</m>') which doesn't
# allow the opcode for alarm, so we need to compile this before we get
# into the safe space since opcode checks only occur at compile time
sub convert_real {
my ($texstring)=@_;
my ($xmlstring,$errorstring);
local $SIG{SEGV}=sub { $Apache::lontexconvert::messedup=1; die; };
local $SIG{ALRM}=sub {
&Apache::lonnet::logthis("ALRM");
$xmlstring='['.&mt("TeX unconverted due to errors").']';
$Apache::lontexconvert::messedup=1;
die &mt("TeX unconverted due to errors");
};
alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
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();
$xmlstring=~s-</font(\s*)>-</font>-g;
}
$xmlstring=~s/^\s*\<br clear\=\"all\"/\<br/s;
$xmlstring=~s/^\s*//;
$xmlstring=~s/\s*$//;
alarm(0);
return ($xmlstring,$errorstring);
}
sub converted {
my $texstring=shift;
my $xmlstring='['.&mt('UNDISPLAYABLE').']';
if ($Apache::lontexconvert::messedup) {
return '['.&mt('TeX unconverted due to previous errors').']';
}
eval(<<'ENDCONV');
($xmlstring,$errorstring)=&convert_real($texstring)
ENDCONV
if ($@) {
$errorstring.=&mt("Evaluation Error: ").$@;
$Apache::lontexconvert::messedup=1;
}
if ($Apache::lontexconvert::messedup || &tth::tthmessedup() ||
$errorstring) {
&Apache::lonnet::logthis("Trying to kill myself");
$Apache::lontexconvert::messedup=1;
my $request=Apache->request();
$request->child_terminate();
}
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*\/?\>/ /gs;
# $string=~s/\s/ /gs;
$string=&HTML::Entities::decode($string);
return &converted(\$string);
}
sub smiley {
my $expression=shift;
if ($ENV{'browser.imagesuppress'} eq 'on') { return $expression; }
my %smileys=('\:\-\)' => 'smiley',
'8\-\)' => 'coolsmile',
'8\-(I|\|)' => 'coolindiff',
':\-(I|\|)' => 'neutral',
'\:\-(o|O|\(\))' => 'shocked',
':\-\(' => 'frowny',
'\;\-\)' => 'wink',
'\:\-P' => 'baeh',
'\:\-(\\\|\\/)' => 'hrrm',
'\:\-D' => 'bigsmile',
'\:\-C' => 'angry',
'\:(\'|\`)\-\(' => 'cry',
'\:\-(X|\#)' => 'lipsrsealed',
'\:\-S' => 'huh');
my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
foreach (keys %smileys) {
$expression=~s/$_/\<img src="$iconpath\/$smileys{$_}.gif" \/\>/gs;
}
return $expression;
}
sub msgtexconverted {
my ($message,$email) = @_;
$errorstring='';
&init_tth();
my $outmessage='';
my $tex=0;
foreach (split(/(?:\<\;|\<)\/*m\s*(?:\>\;|\>)/i,$message)) {
if ($tex) {
if ($email) {
$outmessage.='</pre><tt>'.&to_convert($_).'</tt><pre>'; $tex=0;
} else {
$outmessage.=&to_convert($_); $tex=0;
}
} else {
$outmessage.=&smiley($_); $tex=1;
}
}
if (wantarray) {
return ($outmessage,$errorstring);
} else {
return $outmessage.$errorstring;
}
}
sub algebra {
my ($string,$target)=@_;
my $parser = new AlgParserWithImplicitExpand;
$string=&prepare_algebra($string);
my $ret = $parser->parse($string);
my $result='['.&mt('Algebra unconverted due to previous errors').']';
if ( ref($ret) ) {
$parser->tostring();
$parser->normalize();
my $latex=$parser->tolatex();
$latex=&postprocess_algebra($string);
$latex='$'.$latex.'$';
if ($target eq 'web' || $target eq 'analyze') {
$result = &converted(\$latex);
} else {
$result = $latex;
}
} else {
&Apache::lonxml::error($parser->{'htmlerror'});
}
}
sub prepare_algebra {
my ($string)=@_;
# change some multi character operators into single character operators
$string =~ s/<>/\#/g;
$string =~ s/<\=/\%/g;
$string =~ s/>\=/\!/g;
#protect the confusable greek symbols
$string =~ s/delta/zdelta/g;
$string =~ s/beta/bita/g;
$string =~ s/theta/thita/g;
$string =~ s/zeta/zita/g;
$string =~ s/eta/xeta/g;
$string =~ s/epsilon/zepslon/g;
$string =~ s/upsilon/zupslon/g;
return $string;
}
sub postprocess_algebra {
my ($string)=@_;
# exapnd out some operators
$string =~ s/\#/\\not= /g;
$string =~ s/\%/\\leq /g;
$string =~ s/\!/\\geq /g;
# replace some special symbols with the LaTeX equivalents
$string =~ s/infty/\\infty/g;
$string =~ s/infinity/\\infty/g;
$string =~ s/alpha/\\alpha/g;
$string =~ s/gamma/\\gamma/g;
$string =~ s/iota/\\iota/g;
$string =~ s/kappa/\\kappa/g;
$string =~ s/lambda/\\lambda/g;
$string =~ s/mu/\\mu/g;
$string =~ s/nu/\\nu/g;
$string =~ s/xi/\\xi/g;
$string =~ s/rho/\\rho/g;
$string =~ s/sigma/\\sigma/g;
$string =~ s/tau/\\tau/g;
$string =~ s/phi/\\phi/g;
$string =~ s/chi/\\chi/g;
$string =~ s/psi/\\psi/g;
$string =~ s/omega/\\omega/g;
$string =~ s/zdelta/\\delta/g;
$string =~ s/bita/\\beta/g;
$string =~ s/thita/\\theta/g;
$string =~ s/zita/\\zeta/g;
$string =~ s/xeta/\\eta/g;
$string =~ s/zepslon/\\epsilon/g;
$string =~ s/zupslon/\\upsilon/g;
return $string;
}
1;
__END__
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