File:
[LON-CAPA] /
loncom /
xml /
lontexconvert.pm
Revision
1.84:
download - view:
text,
annotated -
select for diffs
Tue Aug 14 19:32:35 2007 UTC (17 years ago) by
albertel
Branches:
MAIN
CVS tags:
version_2_6_X,
version_2_6_3,
version_2_6_2,
version_2_6_1,
version_2_6_0,
version_2_5_X,
version_2_5_99_1,
version_2_5_99_0,
version_2_5_2,
version_2_5_1,
version_2_5_0,
HEAD
- BUG#5370, need the popup previous tries window to use jamath if the the problem needed jsmath, so created a means to convey that
# The LearningOnline Network with CAPA
# TeX Conversion Module
#
# $Id: lontexconvert.pm,v 1.84 2007/08/14 19:32:35 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::lonxml();
use Apache::lonlocal;
use Apache::lonnet;
use lib '/home/httpd/lib/perl/';
use LONCAPA;
# ====================================================================== Header
sub init_tth {
my $options=$env{'course.'.$env{'request.course.id'}.'.tthoptions'};
if ($options =~ /\S/) {
$options = ' '.$options;
} else {
undef($options);
}
if ($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);
}
}
}
# ================================================================== 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").']';
$Apache::lontexconvert::messedup=1;
die &mt("TeX unconverted due to errors");
};
&Apache::lonxml::start_alarm();
if ($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*//;
$xmlstring=~s/\s*$//;
&Apache::lonxml::end_alarm();
return ($xmlstring,$errorstring);
}
sub tth_converted {
my $texstring=shift;
my $xmlstring='['.&mt('UNDISPLAYABLE').']';
if ($Apache::lontexconvert::messedup) {
return '['.&mt('TeX unconverted due to previous errors').']';
}
$$texstring ='\\documentstyle{article}'.$$texstring;
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");
$Apache::lontexconvert::messedup=1;
if (ref($Apache::lonxml::request)) {
$Apache::lonxml::request->child_terminate();
} else {
my $request;
eval { $request=Apache->request; };
if (!$request) {
eval { $request=Apache2::RequestUtil->request; };
}
if ($request) {
$request->child_terminate();
} else {
&Apache::lonnet::logthis("Unable to find a request to do child_terminate on");
}
}
}
return $xmlstring;
}
sub clean_out_math_mode {
my ($texstring)=@_;
$$texstring=~s/(?<!\\)\$//g;
$$texstring=~s/\\[\)\(\]\[]//g;
$$texstring=~s/\\ensuremath//g;
return '';
}
sub displaystyle {
my ($texstring)=@_;
#has a $$ or \[ or \displaystyle in it, guessinng it's display mode
if ($$texstring=~/[^\\]\$\$/ ||
$$texstring=~/\\\[/ ||
$$texstring=~/\\displaystyle/) { return 1; }
return 0;
}
sub jsMath_converted {
my $texstring=shift;
my $tag='span';
if (&displaystyle($texstring)) { $tag='div'; }
&clean_out_math_mode($texstring);
return &jsMath_header().
'<'.$tag.' class="math">'.$$texstring.'</'.$tag.'>';
}
{
my @jsMath_sent_header;
sub jsMath_reset {
undef(@jsMath_sent_header);
}
sub jsMath_push {
push(@jsMath_sent_header,0);
}
sub jsMath_header {
if (!@jsMath_sent_header) {
&Apache::lonnet::logthis("mismatched calls of jsMath_header and jsMath_process");
return '';
}
return '' if $jsMath_sent_header[-1];
$jsMath_sent_header[-1]=1;
return
'<script type="text/javascript">
function NoFontMessage () {}
jsMath = {Parser: {prototype: {environments: {\'eqnarray*\' :[\'Array\',null,null,\'rcl\',[5/18,5/18],3,\'D\']}}}};
</script>'."\n".
'<script type="text/javascript" src="/adm/jsMath/jsMath.js"></script>'."\n";
}
sub jsMath_process {
my $state = pop(@jsMath_sent_header);
return '' if !$state;
return "\n".
'<script type="text/javascript">jsMath.Process()</script>'."\n";
}
sub jsMath_state {
my ($level) = @_;
return $jsMath_sent_header[$level];
}
}
sub tex_engine {
if (exists($env{'form.texengine'})) {
return $env{'form.texengine'};
}
if ($env{'request.course.id'}
&& exists($env{'course.'.$env{'request.course.id'}.'.texengine'})) {
return $env{'course.'.$env{'request.course.id'}.'.texengine'};
}
if (exists($env{'environment.texengine'})) {
return $env{'environment.texengine'};
}
return 'tth';
}
sub init_math_support {
my ($inherit_jsmath) = @_;
&init_tth();
&Apache::lontexconvert::jsMath_push();
if (lc(&tex_engine()) eq 'jsmath' ||
($inherit_jsmath && &jsMath_state(-2))) {
return &Apache::lontexconvert::jsMath_header();
}
return;
}
sub mimetex_converted {
my $texstring=shift;
my $displaystyle=&displaystyle($texstring);
&clean_out_math_mode($texstring);
if ($displaystyle) {
$$texstring='\\displaystyle \\Large '.$$texstring;
}
my $result='<img src="/cgi-bin/mimetex.cgi?'.&escape($$texstring).'" />';
if ($displaystyle) {
$result='<center>'.$result.'</center>';
}
return $result;
}
sub converted {
my ($string,$mode)=@_;
if ($mode eq '') { $mode = &tex_engine(); }
if ($mode =~ /tth/i) {
return &tth_converted($string);
} elsif ($mode =~ /jsmath/i) {
return &jsMath_converted($string);
} elsif ($mode =~ /mimetex/i) {
return &mimetex_converted($string);
}
return &tth_converted($string);
}
# ------------------------------------------------------------ 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 my $smiley (keys(%smileys)) {
$expression=~s/$smiley/\<img src="$iconpath\/$smileys{$smiley}.gif" \/\>/gs;
}
return $expression;
}
sub msgtexconverted {
my ($message,$email) = @_;
$errorstring='';
&init_tth();
my $outmessage='';
my $tex=0;
foreach my $fragment (split(/(?:\<\;|\<)\/*m\s*(?:\>\;|\>)/i,$message)) {
if ($tex) {
if ($email) {
$outmessage.='</pre><tt>'.&to_convert($fragment).'</tt><pre>';
$tex=0;
} else {
$outmessage.=&to_convert($fragment);
$tex=0;
}
} else {
$outmessage.=&smiley($fragment);
$tex=1;
}
}
$message=$outmessage; $outmessage=''; $tex=0;
foreach my $fragment (split(/(?:\<\;|\<)\/*algebra\s*(?:\>\;|\>)/i,
$message)) {
if ($tex) {
if ($email) {
$outmessage.='</pre><tt>'.&algebra($fragment,'web').'</tt><pre>';
$tex=0;
} else {
$outmessage.=&algebra($fragment,'web');
$tex=0;
}
} else {
$outmessage.=$fragment;
$tex=1;
}
}
if (wantarray) {
return ($outmessage,$errorstring);
} else {
return $outmessage.$errorstring;
}
}
sub algebra {
use AlgParser;
my ($string,$target,$style)=@_;
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();
$latex=&postprocess_algebra($latex);
if ($style eq 'display') {
$latex='$$'.$latex.'$$x';
} else {
# style is 'inline'
$latex='\\ensuremath{'.$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)=@_;
# makes the decision about what is a minus sign easier supposedly
$string =~ s/(\<\>|\<\=|\>\=[\=\>\<] *)-/$1 zeroplace -/g;
return $string;
}
sub postprocess_algebra {
my ($string)=@_;
# moodle had these and I don't know why, ignoring them for now
# $string =~s/\\fun/ /g;
# sqrt(3,4) means the 4 root of 3
$string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;
# log(3,4) means the log base 4 of 3
$string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs;
# log(3,4) means the log base 4 of 3
$string =~s/\\((?:sin|cos|tan|sec|csc|cot)(?:h)?)\\left\((.+?),(.+?)\\right\)/\\$1^{$3}\\left($2\\right)/gs;
# int(3,a,b) integral from a to b of 3
$string =~s/\\int\\left\((.+?),(.+?),(.+?)\\right\)/\\int_{$2}^{$3}\\left($1\\right)/gs;
# int( ... dx) -> ...
$string =~s/\\int\\left\((.+?)d[a-z]\\right\)/$1/gs;
#
$string =~s/\\lim\\left\((.+?),(.+?),(.+?)\\right\)/\\lim_{$2\\to $3}$1/gs;
return $string;
}
1;
__END__
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