Annotation of loncom/xml/lontexconvert.pm, revision 1.98.2.1

1.1       harris41    1: # The LearningOnline Network with CAPA
                      2: # TeX Conversion Module
                      3: #
1.98.2.1! raeburn     4: # $Id: lontexconvert.pm,v 1.98 2009/08/12 20:43:25 www 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;
1.1       harris41   52: 
                     53: # ====================================================================== Header
                     54: 
1.29      albertel   55: sub init_tth {
1.65      albertel   56:     my $options=$env{'course.'.$env{'request.course.id'}.'.tthoptions'};
1.74      albertel   57:     if ($options =~ /\S/) {
                     58: 	$options = ' '.$options;
                     59:     } else {
                     60: 	undef($options);
                     61:     }
1.65      albertel   62:     if ($env{'browser.mathml'}) {
1.29      albertel   63: 	&tth::ttminit();
1.65      albertel   64: 	if ($env{'browser.unicode'}) {
1.74      albertel   65: 	    &tth::ttmoptions('-L -u1'.$options);
1.29      albertel   66: 	} else {
1.74      albertel   67: 	    &tth::ttmoptions('-L -u0'.$options);
1.29      albertel   68: 	}
                     69:     } else {
                     70: 	&tth::tthinit();
1.65      albertel   71: 	if ($env{'browser.unicode'}) {
1.74      albertel   72: 	    &tth::tthoptions('-L -u1'.$options);
1.29      albertel   73: 	} else {
1.74      albertel   74: 	    &tth::tthoptions('-L -u0'.$options);
1.29      albertel   75: 	}
                     76:     }
                     77: }
                     78: 
1.1       harris41   79: # ================================================================== Conversion
                     80: 
1.19      albertel   81: $Apache::lontexconvert::messedup=0;
1.36      albertel   82: 
1.91      jms        83: 
1.36      albertel   84: sub convert_real {
                     85:     my ($texstring)=@_;
                     86:     my ($xmlstring,$errorstring);
                     87:     local $SIG{SEGV}=sub { $Apache::lontexconvert::messedup=1; die; };
                     88:     local $SIG{ALRM}=sub { 
1.37      albertel   89: 	&Apache::lonnet::logthis("ALRM");
1.36      albertel   90: 	$xmlstring='['.&mt("TeX unconverted due to errors").']';
                     91: 	$Apache::lontexconvert::messedup=1;
                     92: 	die &mt("TeX unconverted due to errors");
                     93:     };
1.63      albertel   94:     &Apache::lonxml::start_alarm();
1.65      albertel   95:     if ($env{'browser.mathml'}) {
1.36      albertel   96: 	$xmlstring=&tth::ttm($$texstring);
                     97: 	$xmlstring=~s/\<math\>/\<math xmlns=\"\&mathns\;\"\>/g;
                     98: 	$xmlstring=~s/\<br\>/\<br\/\>/g;
                     99: 	$xmlstring=~s/\<p\>/\<p\>\<\/p\>/g;
                    100: 	$errorstring.=&tth::ttmerror();
                    101:     } else {
                    102: 	$xmlstring=&tth::tth($$texstring);
                    103: 	$errorstring.=&tth::ttherror();
                    104: 	$xmlstring=~s-</font(\s*)>-</font>-g;
                    105:     }
1.43      www       106:     $xmlstring=~s/^\s*\<br clear\=\"all\"/\<br/s;
1.36      albertel  107:     $xmlstring=~s/^\s*//;
                    108:     $xmlstring=~s/\s*$//;
1.85      foxr      109:     #
                    110:     # \rightleftharpoons is not converted by tth but maps
                    111:     # reasonably well to &#8660;.  If we get many more of these,
                    112:     # we're going to need to have a translation sub.
                    113:     #
1.87      foxr      114:     my $lrharpoon = pack("U", 0x21cc);
                    115:     $xmlstring=~s/\\rightleftharpoons/$lrharpoon/g;
1.85      foxr      116: 
1.63      albertel  117:     &Apache::lonxml::end_alarm();
1.36      albertel  118:     return ($xmlstring,$errorstring);
                    119: }
                    120: 
1.59      albertel  121: sub tth_converted {
1.31      albertel  122:     my $texstring=shift;
1.34      www       123:     my $xmlstring='['.&mt('UNDISPLAYABLE').']';
1.31      albertel  124:     if ($Apache::lontexconvert::messedup) {
1.35      albertel  125: 	return '['.&mt('TeX unconverted due to previous errors').']';
1.31      albertel  126:     }
1.59      albertel  127:     $$texstring ='\\documentstyle{article}'.$$texstring;
                    128: 
1.31      albertel  129:     eval(<<'ENDCONV');
1.36      albertel  130:     ($xmlstring,$errorstring)=&convert_real($texstring)
1.12      www       131: ENDCONV
1.32      albertel  132:     if ($@) {
1.35      albertel  133: 	$errorstring.=&mt("Evaluation Error: ").$@;
1.32      albertel  134: 	$Apache::lontexconvert::messedup=1;
                    135:     }
1.37      albertel  136:     if ($Apache::lontexconvert::messedup || &tth::tthmessedup() || 
                    137: 	$errorstring) {
1.31      albertel  138: 	&Apache::lonnet::logthis("Trying to kill myself");
                    139: 	$Apache::lontexconvert::messedup=1;
1.70      albertel  140: 	if (ref($Apache::lonxml::request)) {
                    141: 	    $Apache::lonxml::request->child_terminate();
                    142: 	} else {
                    143: 	    my $request;
                    144: 	    eval { $request=Apache->request; };
                    145: 	    if (!$request) {
                    146: 		eval { $request=Apache2::RequestUtil->request; };
                    147: 	    }
                    148: 	    if ($request) {
                    149: 		$request->child_terminate();
                    150: 	    } else {
                    151: 		&Apache::lonnet::logthis("Unable to find a request to do child_terminate on");
                    152: 	    }
                    153: 	}
1.31      albertel  154:     }
                    155:     return $xmlstring;
1.1       harris41  156: }
                    157: 
1.62      albertel  158: sub clean_out_math_mode {
                    159:     my ($texstring)=@_;
1.82      albertel  160:     $$texstring=~s/(?<!\\)\$//g;
1.62      albertel  161:     $$texstring=~s/\\[\)\(\]\[]//g;
                    162:     $$texstring=~s/\\ensuremath//g;
                    163:     return '';
                    164: }
                    165: 
                    166: sub displaystyle {
                    167:     my ($texstring)=@_;
                    168:     #has a $$ or \[ or \displaystyle in it, guessinng it's display mode
                    169:     if ($$texstring=~/[^\\]\$\$/ ||
                    170: 	$$texstring=~/\\\[/ ||
                    171: 	$$texstring=~/\\displaystyle/) { return 1; }
                    172:     return 0;
                    173: }
                    174: 
1.59      albertel  175: sub jsMath_converted {
                    176:     my $texstring=shift;
                    177:     my $tag='span';
1.62      albertel  178:     if (&displaystyle($texstring)) { $tag='div'; }
                    179:     &clean_out_math_mode($texstring);
1.67      albertel  180:     return &jsMath_header().
                    181: 	'<'.$tag.' class="math">'.$$texstring.'</'.$tag.'>';
                    182: }
                    183: 
                    184: {
1.76      albertel  185:     my @jsMath_sent_header;
1.67      albertel  186:     sub jsMath_reset {
1.76      albertel  187: 	undef(@jsMath_sent_header);
                    188:     }
                    189:     sub jsMath_push {
                    190: 	push(@jsMath_sent_header,0);
1.67      albertel  191:     }
                    192:     sub jsMath_header {
1.80      albertel  193: 	if (!@jsMath_sent_header) {
                    194: 	    &Apache::lonnet::logthis("mismatched calls of jsMath_header and jsMath_process");
                    195: 	    return '';
                    196: 	}
1.76      albertel  197: 	return '' if $jsMath_sent_header[-1];
                    198: 	$jsMath_sent_header[-1]=1;
1.67      albertel  199: 	return
                    200:             '<script type="text/javascript">
                    201:                      function NoFontMessage () {}
1.78      albertel  202:                      jsMath = {Parser: {prototype: {environments: {\'eqnarray*\' :[\'Array\',null,null,\'rcl\',[5/18,5/18],3,\'D\']}}}};
1.67      albertel  203:                    </script>'."\n".
1.71      albertel  204: 	    '<script type="text/javascript" src="/adm/jsMath/jsMath.js"></script>'."\n";
1.67      albertel  205:     }
                    206:     sub jsMath_process {
1.76      albertel  207: 	my $state = pop(@jsMath_sent_header);
                    208: 	return '' if !$state;
1.81      albertel  209: 	return "\n".
                    210: 	    '<script type="text/javascript">jsMath.Process()</script>'."\n";
1.67      albertel  211:     }
1.84      albertel  212:     sub jsMath_state {
                    213: 	my ($level) = @_;
                    214: 	return $jsMath_sent_header[$level];
                    215:     }
1.62      albertel  216: }
                    217: 
1.83      albertel  218: sub tex_engine {
                    219:     if (exists($env{'form.texengine'})) {
1.88      raeburn   220: 	if ($env{'form.texengine'} ne '') {
                    221:             return $env{'form.texengine'};
                    222:         }
1.83      albertel  223:     }    
                    224:     if ($env{'request.course.id'}
                    225: 	&& exists($env{'course.'.$env{'request.course.id'}.'.texengine'})) {
                    226: 	return $env{'course.'.$env{'request.course.id'}.'.texengine'};
                    227:     }
                    228:     if (exists($env{'environment.texengine'})) {
                    229: 	return $env{'environment.texengine'};
                    230:     }
                    231:     return 'tth';
                    232: }
                    233: 
1.72      albertel  234: sub init_math_support {
1.84      albertel  235:     my ($inherit_jsmath) = @_;
1.73      albertel  236:     &init_tth();
1.76      albertel  237:     &Apache::lontexconvert::jsMath_push();
1.84      albertel  238:     if (lc(&tex_engine()) eq 'jsmath' ||
                    239: 	($inherit_jsmath && &jsMath_state(-2))) {
1.72      albertel  240: 	return &Apache::lontexconvert::jsMath_header();
                    241:     }
                    242:     return;
                    243: }
                    244: 
1.92      hauer     245: sub mimetex_valign {
1.94      raeburn   246:     my ($esc_texstring)=@_;
                    247:     my $valign = 0;
                    248:     my $lonhost = $Apache::lonnet::perlvar{'lonHostID'};
                    249:     my $hostname = &Apache::lonnet::hostname($lonhost);
                    250:     my $path = '/cgi-bin/mimetex.cgi?'.$esc_texstring;
                    251:     my $socket;
                    252:     &Apache::lonxml::start_alarm();
1.98.2.1! raeburn   253:     my $socket = IO::Socket::INET->new(PeerAddr => $hostname,
        !           254:                                        PeerPort => 'http(80)',
1.94      raeburn   255:                                        Proto    => 'tcp');
                    256:     if ($socket) {
1.96      raeburn   257:         my $headreq = "HEAD $path HTTP/1.0\r\n\r\n";
1.94      raeburn   258:         print $socket $headreq;
                    259:         while (<$socket>) {
                    260:             if (/Vertical\-Align\:\s*?([\-\d]+)/) {
                    261:                 $valign = $1;
                    262:             }
                    263:         }
1.98.2.1! raeburn   264:         $socket->close();
1.92      hauer     265:     }
1.94      raeburn   266:     &Apache::lonxml::end_alarm();
                    267:     return $valign;
1.92      hauer     268: }
                    269: 
1.62      albertel  270: sub mimetex_converted {
                    271:     my $texstring=shift;
1.97      www       272: 
                    273: # Alt-Argument for screen readers
                    274:     my $alt_string=$$texstring;
                    275:     $alt_string=~s/\"/\'\'/g;
                    276: 
                    277: # Is this displaystyle?
                    278: 
1.62      albertel  279:     my $displaystyle=&displaystyle($texstring);
                    280: 
1.97      www       281: # Remove math environment delimiters
                    282: 
1.62      albertel  283:     &clean_out_math_mode($texstring);
                    284: 
                    285:     if ($displaystyle) {
                    286: 	$$texstring='\\displaystyle \\Large '.$$texstring;
1.59      albertel  287:     }
1.94      raeburn   288:     my $esc_texstring = &uri_escape($$texstring);
                    289:     my $valign = &mimetex_valign($esc_texstring);
1.97      www       290:     my $result='<img src="/cgi-bin/mimetex.cgi?'.$esc_texstring.'" style="vertical-align:'.$valign.'px" alt="'.$alt_string.'" />';
1.62      albertel  291:     if ($displaystyle) {
                    292: 	$result='<center>'.$result.'</center>';
                    293:     }
                    294:     return $result;
1.59      albertel  295: }
                    296: 
                    297: sub converted {
1.67      albertel  298:     my ($string,$mode)=@_;
1.83      albertel  299:     if ($mode eq '') { $mode = &tex_engine(); }
1.68      albertel  300:     if ($mode =~ /tth/i) {
1.67      albertel  301: 	return &tth_converted($string);
1.68      albertel  302:     } elsif ($mode =~ /jsmath/i) {
1.67      albertel  303: 	return &jsMath_converted($string);
1.68      albertel  304:     } elsif ($mode =~ /mimetex/i) {
1.67      albertel  305: 	return &mimetex_converted($string);
1.98      www       306:     } elsif ($mode =~ /raw/i) {
                    307:         return $$string;
1.59      albertel  308:     }
1.67      albertel  309:     return &tth_converted($string);
1.59      albertel  310: }
                    311: 
1.6       www       312: # ------------------------------------------------------------ Message display
                    313: 
1.9       albertel  314: sub to_convert {
                    315:     my ($string) = @_;
1.22      www       316:     $string=~s/\<br\s*\/?\>/ /gs;
1.30      albertel  317: #    $string=~s/\s/ /gs;
1.18      albertel  318:     $string=&HTML::Entities::decode($string);
1.9       albertel  319:     return &converted(\$string);
                    320: }
                    321: 
1.20      www       322: sub smiley {
1.31      albertel  323:     my $expression=shift;
1.65      albertel  324:     if ($env{'browser.imagesuppress'} eq 'on') { return $expression; }
1.31      albertel  325:     my %smileys=('\:\-\)' => 'smiley',
                    326: 		 '8\-\)'  => 'coolsmile',
                    327: 		 '8\-(I|\|)'   => 'coolindiff',
                    328: 		 ':\-(I|\|)'   => 'neutral',
                    329: 		 '\:\-(o|O|\(\))' => 'shocked',
                    330: 		 ':\-\('  => 'frowny',
                    331: 		 '\;\-\)' => 'wink',
                    332: 		 '\:\-P'  => 'baeh',
                    333: 		 '\:\-(\\\|\\/)' => 'hrrm',
                    334: 		 '\:\-D'  => 'bigsmile',
                    335: 		 '\:\-C'  => 'angry',
                    336: 		 '\:(\'|\`)\-\(' => 'cry',
                    337: 		 '\:\-(X|\#)' => 'lipsrsealed',
                    338: 		 '\:\-S' => 'huh');
                    339:     my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
1.79      albertel  340:     foreach my $smiley (keys(%smileys)) {
                    341: 	$expression=~s/$smiley/\<img src="$iconpath\/$smileys{$smiley}.gif" \/\>/gs; 
1.31      albertel  342:     }
                    343:     return $expression;
1.20      www       344: }
                    345: 
1.6       www       346: sub msgtexconverted {
1.39      raeburn   347:     my ($message,$email) = @_;
1.17      albertel  348:     $errorstring='';
1.29      albertel  349:     &init_tth();
1.25      www       350:     my $outmessage='';
                    351:     my $tex=0;
1.79      albertel  352:     foreach my $fragment (split(/(?:\&lt\;|\<)\/*m\s*(?:\&gt\;|\>)/i,$message)) {
1.25      www       353: 	if ($tex) {
1.30      albertel  354: 	    if ($email) {
1.79      albertel  355: 		$outmessage.='</pre><tt>'.&to_convert($fragment).'</tt><pre>';
                    356: 		$tex=0;
1.30      albertel  357: 	    } else {
1.79      albertel  358: 		$outmessage.=&to_convert($fragment);
                    359: 		$tex=0;
1.30      albertel  360: 	    }
1.25      www       361: 	} else {
1.79      albertel  362:             $outmessage.=&smiley($fragment);
                    363: 	    $tex=1;
1.25      www       364: 	}
                    365:     }
1.64      albertel  366:     $message=$outmessage; $outmessage=''; $tex=0;
1.79      albertel  367:     foreach my $fragment (split(/(?:\&lt\;|\<)\/*algebra\s*(?:\&gt\;|\>)/i,
                    368: 				$message)) {
1.64      albertel  369: 	if ($tex) {
                    370: 	    if ($email) {
1.79      albertel  371: 		$outmessage.='</pre><tt>'.&algebra($fragment,'web').'</tt><pre>';
                    372: 		$tex=0;
1.64      albertel  373: 	    } else {
1.79      albertel  374: 		$outmessage.=&algebra($fragment,'web');
                    375: 		$tex=0;
1.64      albertel  376: 	    }
                    377: 	} else {
1.79      albertel  378:             $outmessage.=$fragment;
                    379: 	    $tex=1;
1.64      albertel  380: 	}
                    381:     }
1.24      albertel  382:     if (wantarray) {
1.25      www       383: 	return ($outmessage,$errorstring);
1.24      albertel  384:     } else {
1.25      www       385: 	return $outmessage.$errorstring;
1.24      albertel  386:     }
1.1       harris41  387: }
                    388: 
1.44      albertel  389: sub algebra {
1.49      albertel  390:     use AlgParser;
                    391: 
1.89      droeschl  392:     my ($string,$target,$style,$parstack,$safeeval)=@_;
1.44      albertel  393:     my $parser = new AlgParserWithImplicitExpand;
1.46      albertel  394:     $string=&prepare_algebra($string);
1.44      albertel  395:     my $ret = $parser->parse($string);
                    396:     my $result='['.&mt('Algebra unconverted due to previous errors').']';
                    397:     if ( ref($ret) ) {
1.50      albertel  398: 	#$parser->tostring();
1.44      albertel  399: 	$parser->normalize();
                    400: 	my $latex=$parser->tolatex();
1.49      albertel  401: 	$latex=&postprocess_algebra($latex);
1.58      albertel  402: 	if ($style eq 'display') {
                    403: 	    $latex='$$'.$latex.'$$x';
                    404: 	} else {
1.61      albertel  405: 	    # style is 'inline'
1.58      albertel  406: 	    $latex='\\ensuremath{'.$latex.'}';
                    407: 	}
1.44      albertel  408: 	if ($target eq 'web' || $target eq 'analyze') {
1.89      droeschl  409:             my $display=&Apache::lonxml::get_param('display',$parstack,$safeeval);
                    410:             $result = &converted(\$latex,$display);
                    411: #	    $result = &converted(\$latex);
1.44      albertel  412: 	} else {
                    413: 	    $result = $latex;
                    414: 	}
                    415:     } else {
                    416: 	&Apache::lonxml::error($parser->{'htmlerror'});
                    417:     }
                    418: }
                    419: 
1.46      albertel  420: sub prepare_algebra {
                    421:     my ($string)=@_;
                    422: 
1.50      albertel  423:     # makes the decision about what is a minus sign easier supposedly
1.57      albertel  424:     $string =~ s/(\<\>|\<\=|\>\=[\=\>\<] *)-/$1 zeroplace -/g;
1.48      albertel  425: 
1.46      albertel  426:     return $string;
                    427: }
                    428: 
                    429: sub postprocess_algebra {
                    430:     my ($string)=@_;
1.48      albertel  431:     
1.50      albertel  432:     # moodle had these and I don't know why, ignoring them for now
1.51      albertel  433:     # $string =~s/\\fun/ /g;
1.47      albertel  434: 
1.51      albertel  435:     # sqrt(3,4) means the 4 root of 3
1.52      albertel  436:     $string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;
                    437: 
1.53      albertel  438:     # log(3,4) means the log base 4 of 3
                    439:     $string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs;
                    440: 
1.54      albertel  441:     # log(3,4) means the log base 4 of 3
                    442:     $string =~s/\\((?:sin|cos|tan|sec|csc|cot)(?:h)?)\\left\((.+?),(.+?)\\right\)/\\$1^{$3}\\left($2\\right)/gs;
                    443: 
1.55      albertel  444:     # int(3,a,b) integral from a to b of 3
                    445:     $string =~s/\\int\\left\((.+?),(.+?),(.+?)\\right\)/\\int_{$2}^{$3}\\left($1\\right)/gs;
                    446: 
                    447:     # int( ... dx) -> ...
                    448:     $string =~s/\\int\\left\((.+?)d[a-z]\\right\)/$1/gs;
1.51      albertel  449: 
1.56      albertel  450:     # 
                    451:     $string =~s/\\lim\\left\((.+?),(.+?),(.+?)\\right\)/\\lim_{$2\\to $3}$1/gs;
1.46      albertel  452:     return $string;
                    453: }
1.1       harris41  454: 1;
                    455: __END__
                    456: 
                    457: 
1.91      jms       458: =pod
                    459: 
                    460: =head1 NAME
                    461: 
                    462: Apache::lontexconvert;
                    463: 
                    464: =head1 SYNOPSIS
                    465: 
                    466: Access to tth/ttm
                    467: 
                    468: This is part of the LearningOnline Network with CAPA project
                    469: described at http://www.lon-capa.org.
                    470: 
                    471: 
                    472: =head1 SUBROUTINES
                    473: 
                    474: =over
                    475: 
                    476: =item init_tth()
                    477: 
                    478: Header
                    479: 
                    480: =item convert_real()
                    481: 
                    482:  we need this routine because &converted can get called from inside
                    483:  of the safespace (through &xmlparse('<m>stuff</m>') which doesn't
                    484:  allow the opcode for alarm, so we need to compile this before we get
                    485:  into the safe space since opcode checks only occur at compile time
                    486: 
                    487: =item tth_converted()
                    488: 
                    489: 
                    490: =item clean_out_math_mode()
                    491: 
                    492: 
                    493: =item displaystyle()
                    494: 
                    495: 
                    496: =item jsMath_converted()
                    497: 
                    498: 
                    499: =item tex_engine()
                    500: 
                    501: 
                    502: =item init_math_support()
                    503: 
1.98.2.1! raeburn   504: =item mimetex_valign()
        !           505: 
        !           506:  Makes a HEAD call to /cgi-bin/mimetex.cgi via IO:: to retrieve the
        !           507:  vertical alignment, before the subsequent call to mimetex_converted()
        !           508:  which generates the <img> tag and the corresponding image.
        !           509: 
        !           510:  Input: 1.  $esc_texstring (escaped TeX to be rendered by mimetex).
        !           511:  Output: 1. $valign - number of pixels: positive or negative integer
        !           512:             which will be included in <img> tag for mimetex image to
        !           513:             support vertical alignment of image within a line of text.
        !           514: 
        !           515:  If a server is running SSL, and Apache rewrite rules are in place
        !           516:  to rewrite requests for http to https, modification will most likely
        !           517:  be needed for pass through for HEAD requests for /cgi-bin/mimetex.cgi.
        !           518: 
        !           519:  Example rewrite rules which rewrite all http traffic to https,
        !           520:  except HEAD requests for /cgi-bin/mimetex.cgi are:
        !           521: 
        !           522:  <IfModule mod_rewrite.c>
        !           523:      RewriteEngine On
        !           524:      RewriteLogLevel 0
        !           525: 
        !           526:      RewriteCond %{HTTPS} off
        !           527:      RewriteCond %{HTTP:Host} (.*)
        !           528:      RewriteCond %{REQUEST_METHOD} !HEAD
        !           529:      RewriteRule ^/(.*) https://%1/$1 [R=301,L]
        !           530: 
        !           531:      RewriteCond %{HTTPS} off
        !           532:      RewriteCond %{HTTP:Host} (.*)
        !           533:      RewriteCond %{REQUEST_METHOD} HEAD
        !           534:      RewriteCond %{REQUEST_URI} !^/cgi-bin/mimetex.cgi
        !           535:      RewriteRule ^/(.*) https://%1/$1 [R=301,L]
        !           536:  </IfModule>
1.91      jms       537: 
                    538: =item mimetex_converted()
                    539: 
                    540: 
                    541: =item converted()
                    542: 
                    543: 
                    544: =item to_convert()
                    545: 
                    546: message display
                    547: 
                    548: =item smiley()
                    549: 
                    550: ???
                    551: 
                    552: =item msgtexconverted()
                    553: 
                    554: =item algebra()
                    555: 
                    556: =item prepare_algebra()
                    557: 
                    558: =item postprocess_algebra()
1.1       harris41  559: 
1.91      jms       560: =back
1.1       harris41  561: 
1.91      jms       562: =cut
1.1       harris41  563: 
                    564: 
                    565: 

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