Annotation of loncom/xml/lontexconvert.pm, revision 1.102

1.1       harris41    1: # The LearningOnline Network with CAPA
                      2: # TeX Conversion Module
                      3: #
1.102   ! faziophi    4: # $Id: lontexconvert.pm,v 1.101 2010/01/26 01:16:30 faziophi Exp $
1.4       www         5: #
                      6: # Copyright Michigan State University Board of Trustees
                      7: #
                      8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
                      9: #
                     10: # LON-CAPA is free software; you can redistribute it and/or modify
                     11: # it under the terms of the GNU General Public License as published by
                     12: # the Free Software Foundation; either version 2 of the License, or
                     13: # (at your option) any later version.
                     14: #
                     15: # LON-CAPA is distributed in the hope that it will be useful,
                     16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
                     17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     18: # GNU General Public License for more details.
                     19: #
                     20: # You should have received a copy of the GNU General Public License
                     21: # along with LON-CAPA; if not, write to the Free Software
                     22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
                     23: #
                     24: # /home/httpd/html/adm/gpl.txt
                     25: #
                     26: # http://www.lon-capa.org/
                     27: #
                     28: # Copyright for TtHfunc and TtMfunc by Ian Hutchinson. 
                     29: # TtHfunc and TtMfunc (the "Code") may be compiled and linked into 
                     30: # binary executable programs or libraries distributed by the 
                     31: # Michigan State University (the "Licensee"), but any binaries so 
                     32: # distributed are hereby licensed only for use in the context
                     33: # of a program or computational system for which the Licensee is the 
                     34: # primary author or distributor, and which performs substantial 
                     35: # additional tasks beyond the translation of (La)TeX into HTML.
                     36: # The C source of the Code may not be distributed by the Licensee
                     37: # to any other parties under any circumstances.
                     38: #
1.1       harris41   39: 
                     40: package Apache::lontexconvert;
                     41: 
                     42: use strict;
1.33      albertel   43: use tth();
1.1       harris41   44: use vars qw($errorstring);
1.73      albertel   45: #use Apache::lonxml();
1.33      albertel   46: use Apache::lonlocal;
1.65      albertel   47: use Apache::lonnet;
1.75      www        48: use lib '/home/httpd/lib/perl/';
                     49: use LONCAPA;
1.94      raeburn    50: use URI::Escape;
                     51: use IO::Socket::INET;
                     52: use IO::Socket::SSL;
1.1       harris41   53: 
                     54: # ====================================================================== Header
                     55: 
1.29      albertel   56: sub init_tth {
1.65      albertel   57:     my $options=$env{'course.'.$env{'request.course.id'}.'.tthoptions'};
1.74      albertel   58:     if ($options =~ /\S/) {
                     59: 	$options = ' '.$options;
                     60:     } else {
                     61: 	undef($options);
                     62:     }
1.65      albertel   63:     if ($env{'browser.mathml'}) {
1.29      albertel   64: 	&tth::ttminit();
1.65      albertel   65: 	if ($env{'browser.unicode'}) {
1.74      albertel   66: 	    &tth::ttmoptions('-L -u1'.$options);
1.29      albertel   67: 	} else {
1.74      albertel   68: 	    &tth::ttmoptions('-L -u0'.$options);
1.29      albertel   69: 	}
                     70:     } else {
                     71: 	&tth::tthinit();
1.65      albertel   72: 	if ($env{'browser.unicode'}) {
1.74      albertel   73: 	    &tth::tthoptions('-L -u1'.$options);
1.29      albertel   74: 	} else {
1.74      albertel   75: 	    &tth::tthoptions('-L -u0'.$options);
1.29      albertel   76: 	}
                     77:     }
                     78: }
                     79: 
1.1       harris41   80: # ================================================================== Conversion
                     81: 
1.19      albertel   82: $Apache::lontexconvert::messedup=0;
1.36      albertel   83: 
1.91      jms        84: 
1.36      albertel   85: sub convert_real {
                     86:     my ($texstring)=@_;
                     87:     my ($xmlstring,$errorstring);
                     88:     local $SIG{SEGV}=sub { $Apache::lontexconvert::messedup=1; die; };
                     89:     local $SIG{ALRM}=sub { 
1.37      albertel   90: 	&Apache::lonnet::logthis("ALRM");
1.36      albertel   91: 	$xmlstring='['.&mt("TeX unconverted due to errors").']';
                     92: 	$Apache::lontexconvert::messedup=1;
                     93: 	die &mt("TeX unconverted due to errors");
                     94:     };
1.63      albertel   95:     &Apache::lonxml::start_alarm();
1.65      albertel   96:     if ($env{'browser.mathml'}) {
1.36      albertel   97: 	$xmlstring=&tth::ttm($$texstring);
                     98: 	$xmlstring=~s/\<math\>/\<math xmlns=\"\&mathns\;\"\>/g;
                     99: 	$xmlstring=~s/\<br\>/\<br\/\>/g;
                    100: 	$xmlstring=~s/\<p\>/\<p\>\<\/p\>/g;
                    101: 	$errorstring.=&tth::ttmerror();
                    102:     } else {
                    103: 	$xmlstring=&tth::tth($$texstring);
                    104: 	$errorstring.=&tth::ttherror();
                    105: 	$xmlstring=~s-</font(\s*)>-</font>-g;
                    106:     }
1.43      www       107:     $xmlstring=~s/^\s*\<br clear\=\"all\"/\<br/s;
1.36      albertel  108:     $xmlstring=~s/^\s*//;
                    109:     $xmlstring=~s/\s*$//;
1.85      foxr      110:     #
                    111:     # \rightleftharpoons is not converted by tth but maps
                    112:     # reasonably well to &#8660;.  If we get many more of these,
                    113:     # we're going to need to have a translation sub.
                    114:     #
1.87      foxr      115:     my $lrharpoon = pack("U", 0x21cc);
                    116:     $xmlstring=~s/\\rightleftharpoons/$lrharpoon/g;
1.85      foxr      117: 
1.63      albertel  118:     &Apache::lonxml::end_alarm();
1.36      albertel  119:     return ($xmlstring,$errorstring);
                    120: }
                    121: 
1.59      albertel  122: sub tth_converted {
1.31      albertel  123:     my $texstring=shift;
1.34      www       124:     my $xmlstring='['.&mt('UNDISPLAYABLE').']';
1.31      albertel  125:     if ($Apache::lontexconvert::messedup) {
1.35      albertel  126: 	return '['.&mt('TeX unconverted due to previous errors').']';
1.31      albertel  127:     }
1.59      albertel  128:     $$texstring ='\\documentstyle{article}'.$$texstring;
                    129: 
1.31      albertel  130:     eval(<<'ENDCONV');
1.36      albertel  131:     ($xmlstring,$errorstring)=&convert_real($texstring)
1.12      www       132: ENDCONV
1.32      albertel  133:     if ($@) {
1.35      albertel  134: 	$errorstring.=&mt("Evaluation Error: ").$@;
1.32      albertel  135: 	$Apache::lontexconvert::messedup=1;
                    136:     }
1.37      albertel  137:     if ($Apache::lontexconvert::messedup || &tth::tthmessedup() || 
                    138: 	$errorstring) {
1.31      albertel  139: 	&Apache::lonnet::logthis("Trying to kill myself");
                    140: 	$Apache::lontexconvert::messedup=1;
1.70      albertel  141: 	if (ref($Apache::lonxml::request)) {
                    142: 	    $Apache::lonxml::request->child_terminate();
                    143: 	} else {
                    144: 	    my $request;
                    145: 	    eval { $request=Apache->request; };
                    146: 	    if (!$request) {
                    147: 		eval { $request=Apache2::RequestUtil->request; };
                    148: 	    }
                    149: 	    if ($request) {
                    150: 		$request->child_terminate();
                    151: 	    } else {
                    152: 		&Apache::lonnet::logthis("Unable to find a request to do child_terminate on");
                    153: 	    }
                    154: 	}
1.31      albertel  155:     }
                    156:     return $xmlstring;
1.1       harris41  157: }
                    158: 
1.62      albertel  159: sub clean_out_math_mode {
                    160:     my ($texstring)=@_;
1.82      albertel  161:     $$texstring=~s/(?<!\\)\$//g;
1.62      albertel  162:     $$texstring=~s/\\[\)\(\]\[]//g;
                    163:     $$texstring=~s/\\ensuremath//g;
                    164:     return '';
                    165: }
                    166: 
                    167: sub displaystyle {
                    168:     my ($texstring)=@_;
                    169:     #has a $$ or \[ or \displaystyle in it, guessinng it's display mode
                    170:     if ($$texstring=~/[^\\]\$\$/ ||
                    171: 	$$texstring=~/\\\[/ ||
                    172: 	$$texstring=~/\\displaystyle/) { return 1; }
                    173:     return 0;
                    174: }
                    175: 
1.59      albertel  176: sub jsMath_converted {
                    177:     my $texstring=shift;
                    178:     my $tag='span';
1.62      albertel  179:     if (&displaystyle($texstring)) { $tag='div'; }
                    180:     &clean_out_math_mode($texstring);
1.67      albertel  181:     return &jsMath_header().
                    182: 	'<'.$tag.' class="math">'.$$texstring.'</'.$tag.'>';
                    183: }
                    184: 
                    185: {
1.76      albertel  186:     my @jsMath_sent_header;
1.67      albertel  187:     sub jsMath_reset {
1.76      albertel  188: 	undef(@jsMath_sent_header);
                    189:     }
                    190:     sub jsMath_push {
                    191: 	push(@jsMath_sent_header,0);
1.67      albertel  192:     }
                    193:     sub jsMath_header {
1.80      albertel  194: 	if (!@jsMath_sent_header) {
                    195: 	    &Apache::lonnet::logthis("mismatched calls of jsMath_header and jsMath_process");
                    196: 	    return '';
                    197: 	}
1.76      albertel  198: 	return '' if $jsMath_sent_header[-1];
                    199: 	$jsMath_sent_header[-1]=1;
1.67      albertel  200: 	return
                    201:             '<script type="text/javascript">
                    202:                      function NoFontMessage () {}
1.78      albertel  203:                      jsMath = {Parser: {prototype: {environments: {\'eqnarray*\' :[\'Array\',null,null,\'rcl\',[5/18,5/18],3,\'D\']}}}};
1.67      albertel  204:                    </script>'."\n".
1.71      albertel  205: 	    '<script type="text/javascript" src="/adm/jsMath/jsMath.js"></script>'."\n";
1.67      albertel  206:     }
                    207:     sub jsMath_process {
1.76      albertel  208: 	my $state = pop(@jsMath_sent_header);
                    209: 	return '' if !$state;
1.81      albertel  210: 	return "\n".
                    211: 	    '<script type="text/javascript">jsMath.Process()</script>'."\n";
1.67      albertel  212:     }
1.84      albertel  213:     sub jsMath_state {
                    214: 	my ($level) = @_;
                    215: 	return $jsMath_sent_header[$level];
                    216:     }
1.62      albertel  217: }
                    218: 
1.83      albertel  219: sub tex_engine {
                    220:     if (exists($env{'form.texengine'})) {
1.88      raeburn   221: 	if ($env{'form.texengine'} ne '') {
                    222:             return $env{'form.texengine'};
                    223:         }
1.83      albertel  224:     }    
                    225:     if ($env{'request.course.id'}
                    226: 	&& exists($env{'course.'.$env{'request.course.id'}.'.texengine'})) {
                    227: 	return $env{'course.'.$env{'request.course.id'}.'.texengine'};
                    228:     }
                    229:     if (exists($env{'environment.texengine'})) {
                    230: 	return $env{'environment.texengine'};
                    231:     }
                    232:     return 'tth';
                    233: }
                    234: 
1.72      albertel  235: sub init_math_support {
1.84      albertel  236:     my ($inherit_jsmath) = @_;
1.73      albertel  237:     &init_tth();
1.76      albertel  238:     &Apache::lontexconvert::jsMath_push();
1.84      albertel  239:     if (lc(&tex_engine()) eq 'jsmath' ||
                    240: 	($inherit_jsmath && &jsMath_state(-2))) {
1.72      albertel  241: 	return &Apache::lontexconvert::jsMath_header();
                    242:     }
                    243:     return;
                    244: }
                    245: 
1.92      hauer     246: sub mimetex_valign {
1.94      raeburn   247:     my ($esc_texstring)=@_;
                    248:     my $valign = 0;
                    249:     my $lonhost = $Apache::lonnet::perlvar{'lonHostID'};
                    250:     my $hostname = &Apache::lonnet::hostname($lonhost);
                    251:     my $protocol = $Apache::lonnet::protocol{$lonhost};
                    252:     my $path = '/cgi-bin/mimetex.cgi?'.$esc_texstring;
                    253:     my $socket;
                    254:     &Apache::lonxml::start_alarm();
                    255:     if ($protocol eq 'https') {
                    256:         $socket = IO::Socket::SSL->new(PeerAddr => $hostname,
                    257:                                        PeerPort => 'https(443)',
                    258:                                        Proto    => 'tcp');
                    259:     } else {
                    260:         $socket = IO::Socket::INET->new(PeerAddr => $hostname,
                    261:                                         PeerPort => 'http(80)',
                    262:                                         Proto    => 'tcp');
                    263:     }
                    264:     if ($socket) {
1.96      raeburn   265:         my $headreq = "HEAD $path HTTP/1.0\r\n\r\n";
1.94      raeburn   266:         print $socket $headreq;
                    267:         while (<$socket>) {
                    268:             if (/Vertical\-Align\:\s*?([\-\d]+)/) {
                    269:                 $valign = $1;
                    270:             }
                    271:         }
                    272:         if ($protocol eq 'https') {
                    273:             $socket->close(SSL_no_shutdown => 1,
                    274:                            SSL_ctx_free => 1);
                    275:         } else {
                    276:             $socket->close();
                    277:         }
1.92      hauer     278:     }
1.94      raeburn   279:     &Apache::lonxml::end_alarm();
                    280:     return $valign;
1.92      hauer     281: }
                    282: 
1.62      albertel  283: sub mimetex_converted {
                    284:     my $texstring=shift;
1.97      www       285: 
                    286: # Alt-Argument for screen readers
                    287:     my $alt_string=$$texstring;
                    288:     $alt_string=~s/\"/\'\'/g;
                    289: 
                    290: # Is this displaystyle?
                    291: 
1.62      albertel  292:     my $displaystyle=&displaystyle($texstring);
                    293: 
1.97      www       294: # Remove math environment delimiters
                    295: 
1.62      albertel  296:     &clean_out_math_mode($texstring);
                    297: 
                    298:     if ($displaystyle) {
                    299: 	$$texstring='\\displaystyle \\Large '.$$texstring;
1.59      albertel  300:     }
1.94      raeburn   301:     my $esc_texstring = &uri_escape($$texstring);
                    302:     my $valign = &mimetex_valign($esc_texstring);
1.97      www       303:     my $result='<img src="/cgi-bin/mimetex.cgi?'.$esc_texstring.'" style="vertical-align:'.$valign.'px" alt="'.$alt_string.'" />';
1.62      albertel  304:     if ($displaystyle) {
                    305: 	$result='<center>'.$result.'</center>';
                    306:     }
                    307:     return $result;
1.59      albertel  308: }
                    309: 
                    310: sub converted {
1.67      albertel  311:     my ($string,$mode)=@_;
1.83      albertel  312:     if ($mode eq '') { $mode = &tex_engine(); }
1.68      albertel  313:     if ($mode =~ /tth/i) {
1.67      albertel  314: 	return &tth_converted($string);
1.68      albertel  315:     } elsif ($mode =~ /jsmath/i) {
1.67      albertel  316: 	return &jsMath_converted($string);
1.68      albertel  317:     } elsif ($mode =~ /mimetex/i) {
1.67      albertel  318: 	return &mimetex_converted($string);
1.98      www       319:     } elsif ($mode =~ /raw/i) {
                    320:         return $$string;
1.59      albertel  321:     }
1.67      albertel  322:     return &tth_converted($string);
1.59      albertel  323: }
                    324: 
1.6       www       325: # ------------------------------------------------------------ Message display
                    326: 
1.9       albertel  327: sub to_convert {
                    328:     my ($string) = @_;
1.102   ! faziophi  329:     &init_tth();
1.22      www       330:     $string=~s/\<br\s*\/?\>/ /gs;
1.30      albertel  331: #    $string=~s/\s/ /gs;
1.18      albertel  332:     $string=&HTML::Entities::decode($string);
1.9       albertel  333:     return &converted(\$string);
                    334: }
                    335: 
1.20      www       336: sub smiley {
1.31      albertel  337:     my $expression=shift;
1.65      albertel  338:     if ($env{'browser.imagesuppress'} eq 'on') { return $expression; }
1.99      faziophi  339:     my %smileys=(
                    340:     	 '\:\-*\)' => 'face-smile.png',
1.100     faziophi  341: 		 '8\-\)'  => 'face-cool.png',
                    342: 		 '8\-(I|\|)'   => 'face-glasses.png',
1.101     faziophi  343: 		 '\:\-(I|\|)'   => 'face-plain.png',
1.99      faziophi  344: 		 '\:\-(o|O|\(\))' => 'face-surprise.png',
1.101     faziophi  345: 		 ':\-\('  => 'face-sad.png',
                    346: 		 '\;\-\)' => 'face-wink.png',
                    347: 		 '\:\-(P|p)'  => 'face-raspberry.png',
1.100     faziophi  348: 		 '\:\-(\\\|\\/)' => 'face-uncertain.png',
1.101     faziophi  349: 		 '\:\-D'  => 'face-smile-big.png',
                    350: 		 '\:\-(C|\@)'  => 'face-angry.png',
1.99      faziophi  351: 		 '\:(\'|\`)\-*\(' => 'face-crying.png',
1.101     faziophi  352: 		 '\:\-(X|x|\#)' => 'face-quiet.png',
                    353: 		 '\:\-(s|S)' => 'face-uncertain.png',
                    354: 		 '\:\-\$' => 'face-embarrassed.png',
                    355: 		 '\:\-\*' => 'face-kiss.png',
1.99      faziophi  356: 		 '\+O\(' => 'face-sick.png',
                    357: 		 '(\&lt\;3|\(heart\))' => 'heart.png',
                    358: 		 '\(rose\)' => 'rose.png',
                    359: 		 '\(pizza\)' => 'food-pizza.png',
                    360: 		 '\(cake\)' => 'food-cake.png',
                    361: 		 '\(ninja\)' => 'face-ninja.png',
                    362: 		 '\(pirate\)' => 'face-pirate.png',
                    363: 		 '\((agree|yes)\)' => 'opinion-agree.png',
                    364: 		 '\((disagree|nay)\)' => 'opinion-disagree.png',
1.101     faziophi  365: 		 '(o|O)\-\)' => 'face-angel.png',
1.99      faziophi  366: 		 );
1.31      albertel  367:     my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
1.79      albertel  368:     foreach my $smiley (keys(%smileys)) {
1.99      faziophi  369: 	$expression=~s/$smiley/\<img src="$iconpath\/$smileys{$smiley}" \/\>/gs; 
1.31      albertel  370:     }
                    371:     return $expression;
1.20      www       372: }
                    373: 
1.6       www       374: sub msgtexconverted {
1.39      raeburn   375:     my ($message,$email) = @_;
1.17      albertel  376:     $errorstring='';
1.25      www       377:     my $outmessage='';
                    378:     my $tex=0;
1.79      albertel  379:     foreach my $fragment (split(/(?:\&lt\;|\<)\/*m\s*(?:\&gt\;|\>)/i,$message)) {
1.25      www       380: 	if ($tex) {
1.30      albertel  381: 	    if ($email) {
1.79      albertel  382: 		$outmessage.='</pre><tt>'.&to_convert($fragment).'</tt><pre>';
                    383: 		$tex=0;
1.30      albertel  384: 	    } else {
1.79      albertel  385: 		$outmessage.=&to_convert($fragment);
                    386: 		$tex=0;
1.30      albertel  387: 	    }
1.25      www       388: 	} else {
1.79      albertel  389:             $outmessage.=&smiley($fragment);
                    390: 	    $tex=1;
1.25      www       391: 	}
                    392:     }
1.64      albertel  393:     $message=$outmessage; $outmessage=''; $tex=0;
1.79      albertel  394:     foreach my $fragment (split(/(?:\&lt\;|\<)\/*algebra\s*(?:\&gt\;|\>)/i,
                    395: 				$message)) {
1.64      albertel  396: 	if ($tex) {
                    397: 	    if ($email) {
1.79      albertel  398: 		$outmessage.='</pre><tt>'.&algebra($fragment,'web').'</tt><pre>';
                    399: 		$tex=0;
1.64      albertel  400: 	    } else {
1.79      albertel  401: 		$outmessage.=&algebra($fragment,'web');
                    402: 		$tex=0;
1.64      albertel  403: 	    }
                    404: 	} else {
1.79      albertel  405:             $outmessage.=$fragment;
                    406: 	    $tex=1;
1.64      albertel  407: 	}
                    408:     }
1.24      albertel  409:     if (wantarray) {
1.25      www       410: 	return ($outmessage,$errorstring);
1.24      albertel  411:     } else {
1.25      www       412: 	return $outmessage.$errorstring;
1.24      albertel  413:     }
1.1       harris41  414: }
                    415: 
1.44      albertel  416: sub algebra {
1.49      albertel  417:     use AlgParser;
1.102   ! faziophi  418:     &init_tth();
1.89      droeschl  419:     my ($string,$target,$style,$parstack,$safeeval)=@_;
1.44      albertel  420:     my $parser = new AlgParserWithImplicitExpand;
1.46      albertel  421:     $string=&prepare_algebra($string);
1.44      albertel  422:     my $ret = $parser->parse($string);
                    423:     my $result='['.&mt('Algebra unconverted due to previous errors').']';
                    424:     if ( ref($ret) ) {
1.50      albertel  425: 	#$parser->tostring();
1.44      albertel  426: 	$parser->normalize();
                    427: 	my $latex=$parser->tolatex();
1.49      albertel  428: 	$latex=&postprocess_algebra($latex);
1.58      albertel  429: 	if ($style eq 'display') {
                    430: 	    $latex='$$'.$latex.'$$x';
                    431: 	} else {
1.61      albertel  432: 	    # style is 'inline'
1.58      albertel  433: 	    $latex='\\ensuremath{'.$latex.'}';
                    434: 	}
1.44      albertel  435: 	if ($target eq 'web' || $target eq 'analyze') {
1.89      droeschl  436:             my $display=&Apache::lonxml::get_param('display',$parstack,$safeeval);
                    437:             $result = &converted(\$latex,$display);
                    438: #	    $result = &converted(\$latex);
1.44      albertel  439: 	} else {
                    440: 	    $result = $latex;
                    441: 	}
                    442:     } else {
                    443: 	&Apache::lonxml::error($parser->{'htmlerror'});
                    444:     }
                    445: }
                    446: 
1.46      albertel  447: sub prepare_algebra {
                    448:     my ($string)=@_;
                    449: 
1.50      albertel  450:     # makes the decision about what is a minus sign easier supposedly
1.57      albertel  451:     $string =~ s/(\<\>|\<\=|\>\=[\=\>\<] *)-/$1 zeroplace -/g;
1.48      albertel  452: 
1.46      albertel  453:     return $string;
                    454: }
                    455: 
                    456: sub postprocess_algebra {
                    457:     my ($string)=@_;
1.48      albertel  458:     
1.50      albertel  459:     # moodle had these and I don't know why, ignoring them for now
1.51      albertel  460:     # $string =~s/\\fun/ /g;
1.47      albertel  461: 
1.51      albertel  462:     # sqrt(3,4) means the 4 root of 3
1.52      albertel  463:     $string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;
                    464: 
1.53      albertel  465:     # log(3,4) means the log base 4 of 3
                    466:     $string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs;
                    467: 
1.54      albertel  468:     # log(3,4) means the log base 4 of 3
                    469:     $string =~s/\\((?:sin|cos|tan|sec|csc|cot)(?:h)?)\\left\((.+?),(.+?)\\right\)/\\$1^{$3}\\left($2\\right)/gs;
                    470: 
1.55      albertel  471:     # int(3,a,b) integral from a to b of 3
                    472:     $string =~s/\\int\\left\((.+?),(.+?),(.+?)\\right\)/\\int_{$2}^{$3}\\left($1\\right)/gs;
                    473: 
                    474:     # int( ... dx) -> ...
                    475:     $string =~s/\\int\\left\((.+?)d[a-z]\\right\)/$1/gs;
1.51      albertel  476: 
1.56      albertel  477:     # 
                    478:     $string =~s/\\lim\\left\((.+?),(.+?),(.+?)\\right\)/\\lim_{$2\\to $3}$1/gs;
1.46      albertel  479:     return $string;
                    480: }
1.1       harris41  481: 1;
                    482: __END__
                    483: 
                    484: 
1.91      jms       485: =pod
                    486: 
                    487: =head1 NAME
                    488: 
                    489: Apache::lontexconvert;
                    490: 
                    491: =head1 SYNOPSIS
                    492: 
                    493: Access to tth/ttm
                    494: 
                    495: This is part of the LearningOnline Network with CAPA project
                    496: described at http://www.lon-capa.org.
                    497: 
                    498: 
                    499: =head1 SUBROUTINES
                    500: 
                    501: =over
                    502: 
                    503: =item init_tth()
                    504: 
                    505: Header
                    506: 
                    507: =item convert_real()
                    508: 
                    509:  we need this routine because &converted can get called from inside
                    510:  of the safespace (through &xmlparse('<m>stuff</m>') which doesn't
                    511:  allow the opcode for alarm, so we need to compile this before we get
                    512:  into the safe space since opcode checks only occur at compile time
                    513: 
                    514: =item tth_converted()
                    515: 
                    516: 
                    517: =item clean_out_math_mode()
                    518: 
                    519: 
                    520: =item displaystyle()
                    521: 
                    522: 
                    523: =item jsMath_converted()
                    524: 
                    525: 
                    526: =item tex_engine()
                    527: 
                    528: 
                    529: =item init_math_support()
                    530: 
                    531: 
                    532: =item mimetex_converted()
                    533: 
                    534: 
                    535: =item converted()
                    536: 
                    537: 
                    538: =item to_convert()
                    539: 
                    540: message display
                    541: 
                    542: =item smiley()
                    543: 
                    544: ???
                    545: 
                    546: =item msgtexconverted()
                    547: 
                    548: =item algebra()
                    549: 
                    550: =item prepare_algebra()
                    551: 
                    552: =item postprocess_algebra()
1.1       harris41  553: 
1.91      jms       554: =back
1.1       harris41  555: 
1.91      jms       556: =cut
1.1       harris41  557: 
                    558: 
                    559: 

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