Annotation of loncom/xml/londefdef.pm, revision 1.331

1.1       sakharuk    1: # The LearningOnline Network with CAPA
                      2: # Tags Default Definition Module 
                      3: #
1.331   ! albertel    4: # $Id: londefdef.pm,v 1.330 2006/07/19 20:32:23 albertel Exp $
1.41      sakharuk    5: # 
1.34      www         6: #
                      7: # Copyright Michigan State University Board of Trustees
                      8: #
                      9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
                     10: #
                     11: # LON-CAPA is free software; you can redistribute it and/or modify
                     12: # it under the terms of the GNU General Public License as published by
                     13: # the Free Software Foundation; either version 2 of the License, or
                     14: # (at your option) any later version.
                     15: #
                     16: # LON-CAPA is distributed in the hope that it will be useful,
                     17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
                     18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     19: # GNU General Public License for more details.
                     20: #
                     21: # You should have received a copy of the GNU General Public License
                     22: # along with LON-CAPA; if not, write to the Free Software
                     23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
                     24: #
                     25: # /home/httpd/html/adm/gpl.txt
                     26: #
                     27: # http://www.lon-capa.org/
1.156     sakharuk   28: ## Copyright for TtHfunc and TtMfunc by Ian Hutchinson. 
1.34      www        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       sakharuk   39: 
1.2       albertel   40: package Apache::londefdef; 
1.1       sakharuk   41: 
1.267     albertel   42: use Apache::lonnet;
1.1       sakharuk   43: use strict;
1.124     sakharuk   44: use Apache::lonxml;
1.57      sakharuk   45: use Apache::File();
1.70      sakharuk   46: use Image::Magick;
1.118     www        47: use Apache::lonmenu();
                     48: use Apache::lonmeta();
1.187     albertel   49: use Apache::Constants qw(:common);
1.282     foxr       50: use File::Basename;
1.302     foxr       51: # use Data::Dumper;
1.160     sakharuk   52: 
1.38      harris41   53: BEGIN {
1.15      sakharuk   54: 
1.135     sakharuk   55:     &Apache::lonxml::register('Apache::londefdef',('a','abbr','acronym','accessrule','address','allow','applet','area','b','base','basefont','bgo','bgsound','big','blink','blockquote','blankspace','body','br','button','caption','center','cite','code','col','colgroup','dd','del','dfn','dir','div','dl','dt','em','embed','externallink','fieldset','font','form','frame','frameset','h1','h2','h3','h4','h5','h6','head','hr','html','i','iframe','img','input','ins','insert','isindex','kbd','keygen','label','layer','legend','li','link','m','map','marquee','menu','meta','multicol','nobr','noembed','noframes','nolayer','noscript','object','ol','optgroup','option','output','p','param','pre','q','s','samp','select','server','small','spacer','span','strike','strong','sub','sup','table','tbody','td','textarea','tfoot','th','thead','title','tr','tt','tthoption','u','ul','var','wbr','hideweboutput'));
1.15      sakharuk   56: 
1.188     albertel   57: }
                     58: 
1.294     foxr       59: #
                     60: #   Dumps all elements of the table structure.
                     61: #   Need this 'cause evidently when given an array, Data::Dumper only seems
                     62: #   to dump element 0.
                     63: #
1.302     foxr       64: #sub debug_dump_table {
                     65: #    my $lastrow = $#Apache::londefdef::table;
                     66: #    &Apache::lonnet::logthis("Dumping table:  Last row index: $lastrow");
                     67: #    my $row;
                     68: #    for ($row =0; $row <= $lastrow; $row++ ) {
                     69: #	my $text = Dumper($Apache::londefdef::table[$row]);
                     70: #	&Apache::lonnet::logthis("table [ $row ]".$text);
                     71: #    }
                     72: #}
1.188     albertel   73: sub initialize_londefdef {
                     74:     $Apache::londefdef::TD_redirection=0;
                     75:     @Apache::londefdef::table = ();
                     76:     $Apache::londefdef::select=0;
1.243     albertel   77:     undef(@Apache::londefdef::description);
                     78:     @Apache::londefdef::DD=(0);
                     79:     @Apache::londefdef::DT=(0);
1.244     albertel   80:     @Apache::londefdef::seenDT=(0);
1.238     albertel   81:     $Apache::londefdef::list_index=0;
1.327     albertel   82:     undef($Apache::londefdef::head);
                     83:     undef($Apache::londefdef::title);
1.3       sakharuk   84: }
1.1       sakharuk   85: 
1.35      sakharuk   86: #======================= TAG SUBROUTINES =====================
1.8       sakharuk   87: #-- <output>
1.21      albertel   88: sub start_output {
1.122     albertel   89:     my ($target) = @_;
                     90:     if ($target eq 'meta') { $Apache::lonxml::metamode--; }
                     91:     return '';
1.21      albertel   92: }
                     93: sub end_output {
1.122     albertel   94:     my ($target) = @_;
                     95:     if ($target eq 'meta') { $Apache::lonxml::metamode++; }
                     96:     return '';
1.21      albertel   97: }
1.4       sakharuk   98: #-- <m> tag
1.33      albertel   99: sub start_m {
1.190     albertel  100:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
1.122     albertel  101:     my $currentstring = '';
1.193     albertel  102:     my $inside = &Apache::lonxml::get_all_text_unbalanced("/m",$parser);
1.191     albertel  103:     if ($target eq 'web' || $target eq 'analyze') {
1.122     albertel  104: 	&Apache::lonxml::debug("M is starting with:$inside:");
                    105: 	my $eval=&Apache::lonxml::get_param('eval',$parstack,$safeeval);
                    106: 	if ($eval eq 'on') {
                    107: 	    $inside=&Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
                    108: 	    #&Apache::lonxml::debug("M is evaulated to:$inside:");
                    109: 	}
1.317     albertel  110: 	my $tex = $inside;
1.276     albertel  111: 	my $display=&Apache::lonxml::get_param('display',$parstack,$safeeval);
                    112: 	$currentstring = &Apache::lontexconvert::converted(\$inside,$display);
1.122     albertel  113: 	if ($Apache::lontexconvert::errorstring) {
1.317     albertel  114: 	    my $errormsg='<pre>'.&HTML::Entities::encode($Apache::lontexconvert::errorstring,'<>&"').'</pre> occured while attempting to convert this TeX: <pre>';
                    115: 	    $tex = &HTML::Entities::encode($tex,'<>&"');
                    116: 	    my ($linenumber) =
                    117: 		($Apache::lontexconvert::errorstring =~ /Line (\d+)/);
                    118: 	    if (defined($linenumber)) {
                    119: 		my @tex=split("\n",$tex);
                    120: 		$tex[$linenumber]='<b><font color="red">'.
                    121: 		    $tex[$linenumber].'</font></b>';
                    122: 		$tex=join("\n",@tex);
                    123: 	    }
                    124: 	    &Apache::lonxml::warning($errormsg.$tex.'</pre>');
1.122     albertel  125: 	    $Apache::lontexconvert::errorstring='';
                    126: 	}
                    127: 	#&Apache::lonxml::debug("M is ends with:$currentstring:");
1.178     albertel  128: 	$Apache::lonxml::post_evaluate=0;
1.122     albertel  129:     } elsif ($target eq 'tex') {
1.190     albertel  130: 	$currentstring = $inside;
1.178     albertel  131: 	my $eval=&Apache::lonxml::get_param('eval',$parstack,$safeeval);
                    132: 	if ($eval eq 'on') {
                    133: 	    $currentstring=&Apache::run::evaluate($currentstring,$safeeval,$$parstack[-1]);
                    134: 	}
1.122     albertel  135: 	if ($currentstring=~/^(\s*\\\\\s*)*$/) {$currentstring = ' \vskip 0 mm ';}
1.257     albertel  136: 	# detect simple math mode entry exits, and convert them
                    137:         # to use \ensuremath
                    138: 	if ($currentstring=~/^\s*\$[^\$].*[^\$]\$\s*$/) {
1.293     albertel  139: 	    $currentstring=~s/^(\s*)\$/$1/;
                    140: 	    $currentstring=~s/\$(\s*)$/$1/;
1.257     albertel  141: 	    $currentstring='\ensuremath{'.$currentstring.'}';
                    142: 	}
1.178     albertel  143: 	$Apache::lonxml::post_evaluate=0;
1.122     albertel  144:     }
                    145:     return $currentstring;
1.33      albertel  146: }
1.122     albertel  147: 
1.33      albertel  148: sub end_m {
1.122     albertel  149:     my ($target,$token) = @_;
                    150:     my $currentstring = '';
1.204     albertel  151:     if ($target eq 'tex') {
1.122     albertel  152: 	$currentstring = "";
                    153:     }
                    154:     return $currentstring;
1.33      albertel  155: }
1.110     albertel  156: 
                    157: sub start_tthoption {
1.299     albertel  158:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
1.122     albertel  159:     my $result;
1.325     albertel  160:     if ($target eq 'web' || $target eq 'webgrade') {
1.299     albertel  161: 	my $inside = &Apache::lonxml::get_all_text("/tthoption",$parser,
                    162: 						   $style);
1.122     albertel  163: 	$inside=~s/^\s*//;
1.267     albertel  164: 	if ($env{'browser.mathml'}) {
1.122     albertel  165: 	    &tth::ttmoptions($inside);
                    166: 	} else {
                    167: 	    &tth::tthoptions($inside);
                    168: 	}
                    169:     }
                    170:     return $result;
1.110     albertel  171: }
                    172: 
                    173: sub end_tthoption {
1.122     albertel  174:     my ($target,$token) = @_;
                    175:     my $result;
                    176:     return $result;
1.110     albertel  177: }
                    178: 
1.181     sakharuk  179: #-- <html> tag (end tag optional)
1.100     albertel  180: sub start_html {
                    181:     my ($target,$token) = @_;
                    182:     my $currentstring = '';
1.269     albertel  183:     if ($target eq 'web' || $target eq 'edit' || $target eq 'webgrade' ) {
1.327     albertel  184: 	# start_body() takes care of emitting the <html> 
1.100     albertel  185:     } elsif ($target eq 'tex') {
1.331   ! albertel  186: 	$currentstring .= 
        !           187: 	    '\documentclass[letterpaper,twoside]{article}\raggedbottom';
1.267     albertel  188: 	if (($env{'form.latex_type'}=~'batchmode') ||
                    189:             (!$env{'request.role.adv'})) {$currentstring .='\batchmode';} 
1.217     sakharuk  190: 	$currentstring .= '\newcommand{\keephidden}[1]{}'.
                    191:                           '\renewcommand{\deg}{$^{\circ}$}'.
1.306     foxr      192: 			  '\usepackage{multirow}'.
1.217     sakharuk  193:                           '\usepackage{longtable}'.
                    194:                           '\usepackage{textcomp}'.
                    195:                           '\usepackage{makeidx}'.
                    196:                           '\usepackage[dvips]{graphicx}'.
1.286     foxr      197: 			  '\usepackage{wrapfig}'.
1.248     foxr      198: 			  '\usepackage{picins}'.
1.217     sakharuk  199:                           '\usepackage{epsfig}'.
                    200:                           '\usepackage{calc}'.
                    201:                           '\usepackage{amsmath}'.
                    202:                           '\usepackage{amssymb}'.
                    203:                           '\usepackage{amsfonts}'.
                    204:                           '\usepackage{amsthm}'.
                    205:                           '\usepackage{amscd}'.
                    206:                           '\newenvironment{choicelist}{\begin{list}{}{\setlength{\rightmargin}{0in}\setlength{\leftmargin}{0.13in}\setlength{\topsep}{0.05in}\setlength{\itemsep}{0.022in}\setlength{\parsep}{0in}\setlength{\belowdisplayskip}{0.04in}\setlength{\abovedisplayskip}{0.05in}\setlength{\abovedisplayshortskip}{-0.04in}\setlength{\belowdisplayshortskip}{0.04in}}}{\end{list}}'.
                    207:                           '\renewenvironment{theindex}{\begin{list}{}{{\vskip 1mm \noindent \large\textbf{Index}} \newline \setlength{\rightmargin}{0in}\setlength{\leftmargin}{0.13in}\setlength{\topsep}{0.01in}\setlength{\itemsep}{0.1in}\setlength{\parsep}{-0.02in}\setlength{\belowdisplayskip}{0.01in}\setlength{\abovedisplayskip}{0.01in}\setlength{\abovedisplayshortskip}{-0.04in}\setlength{\belowdisplayshortskip}{0.01in}}}{\end{list}}';
1.100     albertel  208:     }
                    209:     return $currentstring;
                    210: }
1.122     albertel  211: 
                    212: sub end_html {
1.232     sakharuk  213:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.122     albertel  214:     my $currentstring = '';
1.324     albertel  215:     if ($target eq 'web' || $target eq 'webgrade') {
1.327     albertel  216: 	# end_body takes care of the </html>
1.122     albertel  217:     }
                    218:     return $currentstring;
                    219: }
                    220: 
1.181     sakharuk  221: #-- <head> tag (end tag optional)
1.122     albertel  222: sub start_head {
                    223:     my ($target,$token) = @_;
                    224:     my $currentstring = '';
1.324     albertel  225:     if ($target eq 'web' || $target eq 'webgrade') {
1.327     albertel  226: 	&Apache::lonxml::startredirection();
1.122     albertel  227:     } 
                    228:     return $currentstring;
                    229: }
                    230: 
                    231: sub end_head {
                    232:     my ($target,$token) = @_;
                    233:     my $currentstring = '';
1.324     albertel  234:     if (($target eq 'web'      && $env{'request.state'} eq 'published') ||
                    235: 	($target eq 'webgrade' && $env{'request.state'} eq 'published')) {
1.327     albertel  236: 	# in case there is a </head> but no <head>
                    237: 	if ($Apache::lonxml::redirection) {
                    238: 	    $Apache::londefdef::head = &Apache::lonxml::endredirection();
                    239: 	}
1.122     albertel  240:     } 
                    241:     return $currentstring;
                    242: }
                    243: 
1.181     sakharuk  244: #-- <map> tag (end tag required)
1.122     albertel  245: sub start_map {
                    246:     my ($target,$token) = @_;
                    247:     my $currentstring = '';
1.325     albertel  248:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  249: 	$currentstring = $token->[4];     
                    250:     } 
                    251:     return $currentstring;
                    252: }
                    253: 
                    254: sub end_map {
                    255:     my ($target,$token) = @_;
                    256:     my $currentstring = '';
1.325     albertel  257:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  258: 	$currentstring = $token->[2];    
                    259:     } 
                    260:     return $currentstring;
                    261: }
                    262: 
1.181     sakharuk  263: #-- <select> tag (end tag required)
1.122     albertel  264: sub start_select {
                    265:     my ($target,$token) = @_;
                    266:     my $currentstring = '';
1.325     albertel  267:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  268: 	$currentstring = $token->[4];     
1.181     sakharuk  269:     }  elsif ($target eq 'tex') {
                    270: 	$Apache::londefdef::select=0;
                    271:     }
1.122     albertel  272:     return $currentstring;
                    273: }
                    274: 
                    275: sub end_select {
                    276:     my ($target,$token) = @_;
                    277:     my $currentstring = '';
1.325     albertel  278:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  279: 	$currentstring = $token->[2];    
                    280:     } 
                    281:     return $currentstring;
                    282: }
                    283: 
1.181     sakharuk  284: #-- <option> tag (end tag optional)
1.122     albertel  285: sub start_option {
1.181     sakharuk  286:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.122     albertel  287:     my $currentstring = '';
1.325     albertel  288:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  289: 	$currentstring = $token->[4];     
1.181     sakharuk  290:     } elsif ($target eq 'tex') {
                    291: 	$Apache::londefdef::select++;
                    292: 	if ($Apache::londefdef::select == 1) {
                    293: 	    $currentstring='\noindent\fbox{'.&Apache::lonxml::get_param('value',$parstack,$safeeval).'}\keephidden{';
                    294: 	} else {
                    295: 	    $currentstring='\keephidden{';
                    296: 	}
                    297:     }
1.122     albertel  298:     return $currentstring;
                    299: }
                    300: 
                    301: sub end_option {
                    302:     my ($target,$token) = @_;
                    303:     my $currentstring = '';
1.325     albertel  304:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  305: 	$currentstring = $token->[2];    
1.181     sakharuk  306:     }  elsif ($target eq 'tex') {
                    307: 	$currentstring='}';
                    308:     }
1.122     albertel  309:     return $currentstring;
                    310: }
                    311: 
1.181     sakharuk  312: #-- <input> tag (end tag forbidden)
1.122     albertel  313: sub start_input {
                    314:     my ($target,$token) = @_;
                    315:     my $currentstring = '';
1.325     albertel  316:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  317: 	$currentstring = $token->[4];     
                    318:     } 
                    319:     return $currentstring;
                    320: }
                    321: 
                    322: sub end_input {
                    323:     my ($target,$token) = @_;
                    324:     my $currentstring = '';
1.325     albertel  325:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  326: 	$currentstring = $token->[2];    
                    327:     } 
                    328:     return $currentstring;
                    329: }
                    330: 
1.181     sakharuk  331: #-- <textarea> tag (end tag required)
1.122     albertel  332: sub start_textarea {
                    333:     my ($target,$token) = @_;
                    334:     my $currentstring = '';
1.325     albertel  335:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  336: 	$currentstring = $token->[4];     
                    337:     } 
                    338:     return $currentstring;
                    339: }
                    340: 
                    341: sub end_textarea {
                    342:     my ($target,$token) = @_;
                    343:     my $currentstring = '';
1.325     albertel  344:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  345: 	$currentstring = $token->[2];    
                    346:     } 
                    347:     return $currentstring;
                    348: }
                    349: 
1.181     sakharuk  350: #-- <form> tag (end tag required)
1.122     albertel  351: sub start_form {
                    352:     my ($target,$token) = @_;
                    353:     my $currentstring = '';
1.325     albertel  354:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  355: 	$currentstring = $token->[4];     
                    356:     } 
                    357:     return $currentstring;
                    358: }
                    359: 
                    360: sub end_form {
                    361:     my ($target,$token) = @_;
                    362:     my $currentstring = '';
1.325     albertel  363:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  364: 	$currentstring = $token->[2];    
                    365:     } 
                    366:     return $currentstring;
                    367: }
                    368: 
1.181     sakharuk  369: #-- <title> tag (end tag required)
1.122     albertel  370: sub start_title {
1.327     albertel  371:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
1.122     albertel  372:     my $currentstring = '';
1.324     albertel  373:     if ($target eq 'web' || $target eq 'webgrade') {
1.327     albertel  374: 	$Apache::londefdef::title = 
                    375: 	    &Apache::lonxml::get_all_text('/title',$parser,$style);
1.122     albertel  376:     } elsif ($target eq 'tex') {
1.166     sakharuk  377: 	$currentstring .= '\keephidden{Title of the document:  ' 
1.122     albertel  378:     }
                    379:     if ($target eq 'meta') {
                    380: 	$currentstring='<title>';
1.185     albertel  381: 	&start_output($target);
1.122     albertel  382:     }
                    383:     return $currentstring;
                    384: }
                    385: 
                    386: sub end_title {
                    387:     my ($target,$token) = @_;
                    388:     my $currentstring = '';
1.324     albertel  389:     if ($target eq 'web' || $target eq 'webgrade') {
1.327     albertel  390: 	# start_title takes care of swallowing the title
1.122     albertel  391:     } elsif ($target eq 'tex') {
                    392: 	$currentstring .= '}';
                    393:     }  
                    394:     if ($target eq 'meta') {
1.185     albertel  395: 	&end_output($target);
1.122     albertel  396: 	$currentstring='</title>';
                    397:     } 
                    398:     return $currentstring;
                    399: }
                    400: 
1.181     sakharuk  401: #-- <meta> tag (end tag forbidden)
1.122     albertel  402: sub start_meta {
1.299     albertel  403:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
1.122     albertel  404:     my $currentstring = '';
1.325     albertel  405:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  406: 	my $args='';
                    407: 	if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
                    408: 	if ($args eq '') {
1.299     albertel  409: 	    &Apache::lonxml::get_all_text("/meta",$parser,$style);
1.122     albertel  410: 	} else {
                    411: 	    $currentstring = $token->[4];
1.1       sakharuk  412: 	}
1.135     sakharuk  413:     } elsif ($target eq 'meta') {
1.122     albertel  414: 	unless (&Apache::lonxml::get_param
                    415: 		('http-equiv',$parstack,$safeeval,undef,1)) {
                    416: 	    my $name=$token->[2]->{'name'};
                    417: 	    $name=~tr/A-Z/a-z/;
                    418: 	    $name=~s/\s/\_/gs;
                    419: 	    $name=~s/\W//gs;
                    420: 	    if ($name) {
1.154     www       421: 		$currentstring='<'.$name;
                    422:                  my $display=&Apache::lonxml::get_param
                    423: 		('display',$parstack,$safeeval,undef,1);
                    424:                 if ($display) {
                    425:                     $display=~s/\"/\'/g;
                    426: 		    $currentstring.=' display="'.$display.'"';
                    427:                 }
                    428: 		$currentstring.='>'.
1.122     albertel  429: 		    &Apache::lonxml::get_param
                    430: 			('content',$parstack,$safeeval,undef,1).
1.135     sakharuk  431: 			'</'.$name.'>';
1.1       sakharuk  432: 	    }
1.154     www       433:             my $display=&Apache::lonxml::get_param
                    434: 		('display',$parstack,$safeeval,undef,1);
                    435:             if ($display) {
1.204     albertel  436: 		$display=&HTML::Entities::encode($display,'<>&"');
1.154     www       437: 		$currentstring.='<'.$name.'.display>'.$display.
                    438:                                '</'.$name.'.display>';
                    439:             }
1.1       sakharuk  440: 	}
1.135     sakharuk  441:     } elsif ($target eq 'tex') {
1.151     sakharuk  442: 	my $content=&Apache::lonxml::get_param('content',$parstack,$safeeval);
                    443: 	my $name=&Apache::lonxml::get_param('name',$parstack,$safeeval);
                    444: 	if ((not defined $content) && (not defined $name)) {
                    445: 	    &Apache::lonxml::startredirection();
                    446: 	}
1.122     albertel  447:     }
                    448:     return $currentstring;
                    449: }
                    450: 
                    451: sub end_meta {
1.165     albertel  452:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.122     albertel  453:     my $currentstring = '';
1.325     albertel  454:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  455: 	my $args='';
                    456: 	if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
                    457: 	if ($args ne '') {
1.121     www       458: 	    $currentstring = $token->[4];
1.122     albertel  459: 	}
1.135     sakharuk  460:     } elsif ($target eq 'tex') {
1.165     albertel  461: 	my $content=&Apache::lonxml::get_param('content',$parstack,$safeeval);
                    462: 	my $name=&Apache::lonxml::get_param('name',$parstack,$safeeval);
1.164     albertel  463: 	if ((not defined $content) && (not defined $name)) {
1.169     albertel  464: 	    &Apache::lonxml::endredirection();
1.164     albertel  465: 	}
1.135     sakharuk  466:     }
1.122     albertel  467:     return $currentstring;
                    468: }
                    469: 
1.121     www       470: # accessrule
1.122     albertel  471: sub start_accessrule {
1.299     albertel  472:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
1.122     albertel  473:     my $currentstring = '';
                    474:     my $eff=&Apache::lonxml::get_param
                    475: 	('effect',$parstack,$safeeval,undef,1);
                    476:     my $realm=&Apache::lonxml::get_param
                    477: 	('realm',$parstack,$safeeval,undef,1);
1.123     www       478:     my $role=&Apache::lonxml::get_param
                    479: 	('role',$parstack,$safeeval,undef,1);
                    480:     $realm=~s/\s+//g;
                    481:     $realm=~s/\//\_/g;
                    482:     $realm=~s/^\_//;
                    483:     $realm=~s/\W/\;/g;
                    484:     $role=~s/\s+//g;
                    485:     $role=~s/\//\_/g;
                    486:     $role=~s/\W/\;/g;
1.122     albertel  487:     if ($target eq 'web') {
                    488: 	my $args='';
                    489: 	if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
                    490: 	if ($args eq '') {
1.299     albertel  491: 	    &Apache::lonxml::get_all_text("/accessrule",$parser,$style);
1.122     albertel  492: 	} else {
                    493: 	    $currentstring = $token->[4];
                    494: 	}
                    495:     }
                    496:     if ($target eq 'meta') {
1.123     www       497: 	$currentstring='<rule>'.$eff.':'.$realm.':'.$role.'</rule>';
1.122     albertel  498:     }
                    499:     return $currentstring;
                    500: }
                    501: 
                    502: sub end_accessrule {
                    503:     my ($target,$token,$tagstack,$parstack,$parser) = @_;
                    504:     my $currentstring = '';
                    505:     if ($target eq 'web') {
                    506: 	my $args='';
                    507: 	if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
                    508: 	if ($args ne '') {
                    509: 	    $currentstring = $token->[4];
                    510: 	}
                    511:     } 
                    512:     return $currentstring;
                    513: }
                    514: 
1.181     sakharuk  515: #-- <body> tag (end tag required)
1.122     albertel  516: sub start_body {
                    517:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
                    518:     my $currentstring = '';
1.244     albertel  519: 
1.324     albertel  520:     if ($target eq 'web' || $target eq 'webgrade') {
1.170     albertel  521: 	if ($Apache::lonhomework::parsing_a_problem) {
                    522: 	    &Apache::lonxml::warning("<body> tag found inside of <problem> tag this can cause problems.");
                    523: 	    return '';
                    524: 	}
1.122     albertel  525: 	
1.327     albertel  526: 	if (&is_inside_of($tagstack, "head")) {
                    527: 	    &end_head(@_);
1.122     albertel  528: 	}
1.327     albertel  529: 	$currentstring = 
                    530: 	    &Apache::loncommon::start_page($Apache::londefdef::title,
                    531: 					   $Apache::londefdef::head,
                    532: 					   {'add_entries'    => $token->[2],
                    533: 					    'no_title'       => 1,
                    534: 					    'force_register' => 1});
                    535: 
1.267     albertel  536: 	if ($env{'request.state'} ne 'published') {
1.330     albertel  537: 	    $currentstring.=&Apache::lonmenu::constspaceform();
1.122     albertel  538: 	    $currentstring.=(<<EDITBUTTON);
1.278     www       539: <form method="post">
                    540: <input type="submit" name="editmode" accesskey="e" value="Edit" />
                    541: </form>
1.327     albertel  542: <br />
1.40      albertel  543: EDITBUTTON
1.1       sakharuk  544: 	}
1.201     albertel  545: 	$currentstring.=&Apache::lonxml::message_location();
1.122     albertel  546:     } elsif ($target eq 'tex') {
                    547: 	$currentstring = '\begin{document}';  
                    548:     } 
                    549:     return $currentstring;
                    550: }
                    551: 
                    552: sub end_body {
1.259     albertel  553:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.279     foxr      554:     my $currentstring = &end_p();	# Close off unclosed <p>
1.324     albertel  555:     if ($target eq 'web' || $target eq 'webgrade') {
1.327     albertel  556: 	$currentstring .= &Apache::loncommon::end_page({'discussion' => 1});
1.122     albertel  557:     } elsif ($target eq 'tex') {
1.277     foxr      558: 	$currentstring .= '\strut\newline\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}\newline\noindent \end{document}';  
1.122     albertel  559:     } 
                    560:     return $currentstring;
                    561: }
                    562: 
1.309     albertel  563: # \begin{center} causes a new paragprah spacing that looks odd inside 
                    564: # of a table cell
                    565: sub center_correction { return '\vspace*{-6 mm}'; }
1.181     sakharuk  566: #-- <center> tag (end tag required)
1.122     albertel  567: sub start_center {
1.309     albertel  568:     my ($target,$token,$tagstack) = @_;
1.279     foxr      569:     my $currentstring = &end_p();	# Close off any prior para.
1.325     albertel  570:     if ($target eq 'web' || $target eq 'webgrade') {
1.277     foxr      571: 	$currentstring .= $token->[4];     
1.122     albertel  572:     } elsif ($target eq 'tex') {
1.309     albertel  573: 	if (&is_inside_of($tagstack, "table")) {
                    574: 	    $currentstring .= &center_correction();
                    575: 	}
1.277     foxr      576: 	$currentstring .= '\begin{center}';  
1.144     sakharuk  577:     }
1.122     albertel  578:     return $currentstring;
                    579: }
                    580: 
                    581: sub end_center {
1.309     albertel  582:     my ($target,$token,$tagstack) = @_;
1.122     albertel  583:     my $currentstring = '';
1.325     albertel  584:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  585: 	$currentstring = $token->[2];     
                    586:     } elsif ($target eq 'tex') {
                    587: 	$currentstring = '\end{center}';  
1.144     sakharuk  588:     }
1.122     albertel  589:     return $currentstring;
                    590: }
                    591: 
1.181     sakharuk  592: #-- <b> tag (end tag required)
1.279     foxr      593: #      NOTE: In TeX mode disables internal <p>
1.122     albertel  594: sub start_b {
                    595:     my ($target,$token) = @_;
                    596:     my $currentstring = '';
1.325     albertel  597:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  598: 	$currentstring = $token->[4];     
                    599:     } elsif ($target eq 'tex') {
1.279     foxr      600: 	&disable_para();
                    601: 	$currentstring .= '\textbf{';  
1.122     albertel  602:     } 
                    603:     return $currentstring;
                    604: }
                    605: 
                    606: sub end_b {
                    607:     my ($target,$token) = @_;
                    608:     my $currentstring = '';
1.325     albertel  609:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  610: 	$currentstring = $token->[2];     
                    611:     } elsif ($target eq 'tex') {
1.279     foxr      612: 	&enable_para();
                    613: 	$currentstring = '}';
1.122     albertel  614:     } 
                    615:     return $currentstring;
                    616: }
1.35      sakharuk  617: 
1.181     sakharuk  618: #-- <strong> tag (end tag required)
1.279     foxr      619: #    NOTE: in TeX mode disables internal <p>
1.122     albertel  620: sub start_strong {
                    621:     my ($target,$token) = @_;
                    622:     my $currentstring = '';
1.325     albertel  623:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  624: 	$currentstring = $token->[4];     
                    625:     } elsif ($target eq 'tex') {
1.279     foxr      626: 	&disable_para();
1.122     albertel  627: 	$currentstring = '\textbf{';  
                    628:     } 
                    629:     return $currentstring;
                    630: }
                    631: 
                    632: sub end_strong {
                    633:     my ($target,$token) = @_;
                    634:     my $currentstring = '';
1.325     albertel  635:     if ($target eq 'web' || $target eq 'webgrade') {	
1.122     albertel  636: 	$currentstring = $token->[2];     
                    637:     } elsif ($target eq 'tex') {
1.279     foxr      638: 	&enable_para();
1.122     albertel  639: 	$currentstring = '}';  
1.144     sakharuk  640:     }
1.122     albertel  641:     return $currentstring;
                    642: }
                    643: 
1.181     sakharuk  644: #-- <h1> tag (end tag required)
1.122     albertel  645: sub start_h1 {
1.125     sakharuk  646:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.279     foxr      647:     my $currentstring = &end_p();	# Close off any prior para.
1.325     albertel  648:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  649: 	$currentstring .= $token->[4];
                    650:     } elsif ($target eq 'tex') {
1.125     sakharuk  651: 	my $pre;
1.199     albertel  652: 	my $align=lc(&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1));
1.212     sakharuk  653: 	if ($align eq 'center') {
1.125     sakharuk  654: 	    $pre='\begin{center}';
                    655: 	} elsif ($align eq 'left') {
                    656: 	    $pre='\rlap{';
                    657: 	} elsif ($align eq 'right') {
                    658: 	    $pre=' \hfill \llap{';
                    659: 	}
                    660: 	my $TeXsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval,undef,0);
                    661: 	if (not defined $TeXsize) {$TeXsize="large";}
1.275     foxr      662: 	$currentstring .= '\strut\newline '.$pre.'{\\'.$TeXsize.' \textbf{'; 
1.122     albertel  663:     } elsif ($target eq 'meta') {
1.277     foxr      664: 	$currentstring.='<subject>';
1.185     albertel  665: 	&start_output($target);
1.122     albertel  666:     }
                    667:     return $currentstring;
                    668: }
                    669: 
                    670: sub end_h1 {
1.125     sakharuk  671:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.122     albertel  672:     my $currentstring = '';
1.325     albertel  673:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  674: 	$currentstring .= $token->[2];
                    675:     } elsif ($target eq 'tex') {
1.212     sakharuk  676: 	my $post='\vskip 0 mm ';
1.125     sakharuk  677: 	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
1.212     sakharuk  678: 	if ($align eq 'center') {
1.125     sakharuk  679: 	    $post='\end{center}';
                    680: 	} elsif ($align eq 'left') {
                    681: 	    $post='} \hfill'.'\vskip 0 mm ';
                    682: 	} elsif ($align eq 'right') {
                    683: 	    $post='}'.'\vskip 0 mm ';
                    684: 	}
                    685: 	$currentstring .= '}}'.$post;
1.122     albertel  686:     } elsif ($target eq 'meta') {
1.185     albertel  687: 	&end_output($target);
1.122     albertel  688: 	$currentstring='</subject>';
                    689:     } 
                    690:     return $currentstring;
                    691: }
                    692: 
1.35      sakharuk  693: #-- <h2> tag
1.122     albertel  694: sub start_h2 {
1.125     sakharuk  695:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.279     foxr      696:     my $currentstring = &end_p();	# Close off any prior para.
1.325     albertel  697:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  698: 	$currentstring .= $token->[4];
                    699:     } elsif ($target eq 'tex') {
1.125     sakharuk  700: 	my $pre;
                    701: 	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
1.212     sakharuk  702: 	if ($align eq 'center') {
1.125     sakharuk  703: 	    $pre='\begin{center}';
                    704: 	} elsif ($align eq 'left') {
                    705: 	    $pre='\rlap{';
                    706: 	} elsif ($align eq 'right') {
                    707: 	    $pre=' \hfill \llap{';
                    708: 	}
                    709: 	my $TeXsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval,undef,0);
                    710: 	if (not defined $TeXsize) {$TeXsize="large";}
1.275     foxr      711: 	$currentstring .= '\strut\newline '.$pre.'{\\'.$TeXsize.' \textbf{'; 
1.122     albertel  712:     } 
                    713:     return $currentstring;
                    714: }
                    715: 
                    716: sub end_h2 {
1.125     sakharuk  717:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.122     albertel  718:     my $currentstring = '';
1.325     albertel  719:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  720: 	$currentstring .= $token->[2];
                    721:     } elsif ($target eq 'tex') {
1.212     sakharuk  722: 	my $post='\vskip 0 mm ';
1.125     sakharuk  723: 	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
1.212     sakharuk  724: 	if ($align eq 'center') {
1.125     sakharuk  725: 	    $post='\end{center}';
                    726: 	} elsif ($align eq 'left') {
                    727: 	    $post='} \hfill'.'\vskip 0 mm ';
                    728: 	} elsif ($align eq 'right') {
                    729: 	    $post='}'.'\vskip 0 mm ';
                    730: 	}
                    731: 	$currentstring .= '}}'.$post;
1.122     albertel  732:     } 
                    733:     return $currentstring;
                    734: }
                    735: 
1.35      sakharuk  736: #-- <h3> tag
1.122     albertel  737: sub start_h3 {
1.125     sakharuk  738:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.279     foxr      739:     my $currentstring = &end_p();	# Close off any prior para.
1.325     albertel  740:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  741: 	$currentstring .= $token->[4];
                    742:     } elsif ($target eq 'tex') {
1.125     sakharuk  743: 	my $pre;
                    744: 	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
1.212     sakharuk  745: 	if ($align eq 'center') {
1.125     sakharuk  746: 	    $pre='\begin{center}';
                    747: 	} elsif ($align eq 'left') {
                    748: 	    $pre='\rlap{';
                    749: 	} elsif ($align eq 'right') {
                    750: 	    $pre=' \hfill \llap{';
                    751: 	}
                    752: 	my $TeXsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval,undef,0);
                    753: 	if (not defined $TeXsize) {$TeXsize="large";}
1.275     foxr      754: 	$currentstring .= '\strut\newline '.$pre.'{\\'.$TeXsize.' \textbf{'; 
1.122     albertel  755:     } 
                    756:     return $currentstring;
                    757: }
                    758: 
                    759: sub end_h3 {
1.125     sakharuk  760:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.122     albertel  761:     my $currentstring = '';
1.325     albertel  762:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  763: 	$currentstring .= $token->[2];
                    764:     } elsif ($target eq 'tex') {
1.212     sakharuk  765: 	my $post='\vskip 0 mm ';
1.125     sakharuk  766: 	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
1.212     sakharuk  767: 	if ($align eq 'center') {
1.125     sakharuk  768: 	    $post='\end{center}';
                    769: 	} elsif ($align eq 'left') {
                    770: 	    $post='} \hfill'.'\vskip 0 mm ';
                    771: 	} elsif ($align eq 'right') {
                    772: 	    $post='}'.'\vskip 0 mm ';
                    773: 	}
                    774: 	$currentstring .= '}}'.$post;
1.122     albertel  775:     } 
                    776:     return $currentstring;
                    777: }
                    778: 
1.35      sakharuk  779: #-- <h4> tag
1.122     albertel  780: sub start_h4 {
1.125     sakharuk  781:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.279     foxr      782:     my $currentstring = &end_p();	# Close off any prior para.
1.325     albertel  783:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  784: 	$currentstring .= $token->[4];
                    785:     } elsif ($target eq 'tex') {
1.125     sakharuk  786: 	my $pre;
                    787: 	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
1.212     sakharuk  788: 	if ($align eq 'center') {
1.125     sakharuk  789: 	    $pre='\begin{center}';
                    790: 	} elsif ($align eq 'left') {
                    791: 	    $pre='\rlap{';
                    792: 	} elsif ($align eq 'right') {
                    793: 	    $pre=' \hfill \llap{';
                    794: 	}
                    795: 	my $TeXsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval,undef,0);
                    796: 	if (not defined $TeXsize) {$TeXsize="large";}
1.275     foxr      797: 	$currentstring .= '\strut\newline '.$pre.'{\\'.$TeXsize.' \textbf{'; 
1.122     albertel  798:     } 
                    799:     return $currentstring;
                    800: }
                    801: 
                    802: sub end_h4 {
1.125     sakharuk  803:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.122     albertel  804:     my $currentstring = '';
1.325     albertel  805:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  806: 	$currentstring .= $token->[2];
                    807:     } elsif ($target eq 'tex') {
1.212     sakharuk  808: 	my $post='\vskip 0 mm ';
1.125     sakharuk  809: 	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
1.212     sakharuk  810: 	if ($align eq 'center') {
1.125     sakharuk  811: 	    $post='\end{center}';
                    812: 	} elsif ($align eq 'left') {
                    813: 	    $post='} \hfill'.'\vskip 0 mm ';
                    814: 	} elsif ($align eq 'right') {
                    815: 	    $post='}'.'\vskip 0 mm ';
                    816: 	}
                    817: 	$currentstring .= '}}'.$post;
1.122     albertel  818:     } 
                    819:     return $currentstring;
                    820: }
                    821: 
1.35      sakharuk  822: #-- <h5> tag
1.122     albertel  823: sub start_h5 {
1.125     sakharuk  824:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.279     foxr      825:     my $currentstring = &end_p();	# Close off any prior paras.
1.325     albertel  826:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  827: 	$currentstring .= $token->[4];
                    828:     } elsif ($target eq 'tex') {
1.125     sakharuk  829: 	my $pre;
                    830: 	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
1.212     sakharuk  831: 	if ($align eq 'center') {
1.125     sakharuk  832: 	    $pre='\begin{center}';
                    833: 	} elsif ($align eq 'left') {
                    834: 	    $pre='\rlap{';
                    835: 	} elsif ($align eq 'right') {
                    836: 	    $pre=' \hfill \llap{';
                    837: 	}
                    838: 	my $TeXsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval,undef,0);
                    839: 	if (not defined $TeXsize) {$TeXsize="large";}
1.275     foxr      840: 	$currentstring .= '\strut\newline '.$pre.'{\\'.$TeXsize.' \textbf{'; 
1.122     albertel  841:     } 
                    842:     return $currentstring;
                    843: }
                    844: 
                    845: sub end_h5 {
1.125     sakharuk  846:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.122     albertel  847:     my $currentstring = '';
1.325     albertel  848:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  849: 	$currentstring .= $token->[2];
                    850:     } elsif ($target eq 'tex') {
1.212     sakharuk  851: 	my $post='\vskip 0 mm ';
1.125     sakharuk  852: 	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
1.212     sakharuk  853: 	if ($align eq 'center') {
1.125     sakharuk  854: 	    $post='\end{center}';
                    855: 	} elsif ($align eq 'left') {
                    856: 	    $post='} \hfill'.'\vskip 0 mm ';
                    857: 	} elsif ($align eq 'right') {
                    858: 	    $post='}'.'\vskip 0 mm ';
                    859: 	}
                    860: 	$currentstring .= '}}'.$post;
1.122     albertel  861:     } 
                    862:     return $currentstring;
                    863: }
                    864: 
1.35      sakharuk  865: #-- <h6> tag
1.122     albertel  866: sub start_h6 {
1.125     sakharuk  867:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.279     foxr      868:     my $currentstring = &end_p();	# Close off any prior paras.
1.325     albertel  869:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  870: 	$currentstring .= $token->[4];
                    871:     } elsif ($target eq 'tex') {
1.125     sakharuk  872: 	my $pre;
                    873: 	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
1.212     sakharuk  874: 	if ($align eq 'center') {
1.125     sakharuk  875: 	    $pre='\begin{center}';
                    876: 	} elsif ($align eq 'left') {
                    877: 	    $pre='\rlap{';
                    878: 	} elsif ($align eq 'right') {
                    879: 	    $pre=' \hfill \llap{';
                    880: 	}
                    881: 	my $TeXsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval,undef,0);
                    882: 	if (not defined $TeXsize) {$TeXsize="large";}
1.275     foxr      883: 	$currentstring .= '\strut\newline '.$pre.'{\\'.$TeXsize.' \textbf{'; 
1.122     albertel  884:     } 
                    885:     return $currentstring;
                    886: }
                    887: 
                    888: sub end_h6 {
1.125     sakharuk  889:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.122     albertel  890:     my $currentstring = '';
1.325     albertel  891:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  892: 	$currentstring .= $token->[2];
                    893:     } elsif ($target eq 'tex') {
1.212     sakharuk  894: 	my $post='\vskip 0 mm ';
1.125     sakharuk  895: 	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
1.212     sakharuk  896: 	if ($align eq 'center') {
1.125     sakharuk  897: 	    $post='\end{center}';
                    898: 	} elsif ($align eq 'left') {
                    899: 	    $post='} \hfill'.'\vskip 0 mm ';
                    900: 	} elsif ($align eq 'right') {
                    901: 	    $post='}'.'\vskip 0 mm ';
                    902: 	}
                    903: 	$currentstring .= '}}'.$post;
1.122     albertel  904:     } 
                    905:     return $currentstring;
                    906: }
                    907: 
1.181     sakharuk  908: #--- <cite> tag (end tag required)
1.122     albertel  909: sub start_cite {
                    910:     my ($target,$token) = @_;
                    911:     my $currentstring = '';
1.325     albertel  912:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  913: 	$currentstring .= $token->[4];
                    914:     } elsif ($target eq 'tex') {
1.179     sakharuk  915: 	$currentstring .= '\textit{';
1.144     sakharuk  916:     }
1.122     albertel  917:     return $currentstring;
                    918: }
                    919: 
                    920: sub end_cite {
                    921:     my ($target,$token) = @_;
                    922:     my $currentstring = '';
1.325     albertel  923:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  924: 	$currentstring .= $token->[2];
                    925:     } elsif ($target eq 'tex') {
1.179     sakharuk  926: 	$currentstring .= '}';
1.144     sakharuk  927:     }
1.122     albertel  928:     return $currentstring;
                    929: }
                    930: 
1.181     sakharuk  931: #-- <i> tag (end tag required)
1.122     albertel  932: sub start_i {
                    933:     my ($target,$token) = @_;
                    934:     my $currentstring = '';
1.325     albertel  935:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  936: 	$currentstring .= $token->[4];
                    937:     } elsif ($target eq 'tex') {
                    938: 	$currentstring .= '\textit{';
1.144     sakharuk  939:     }
1.122     albertel  940:     return $currentstring;
                    941: }
                    942: 
                    943: sub end_i {
                    944:     my ($target,$token) = @_;
                    945:     my $currentstring = '';
1.325     albertel  946:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  947: 	$currentstring .= $token->[2];
                    948:     } elsif ($target eq 'tex') {
                    949: 	$currentstring .= '}';
                    950:     } 
                    951:     return $currentstring;
                    952: }
                    953: 
1.181     sakharuk  954: #-- <address> tag (end tag required)
1.122     albertel  955: sub start_address {
                    956:     my ($target,$token) = @_;
                    957:     my $currentstring = '';
1.325     albertel  958:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  959: 	$currentstring .= $token->[4];
                    960:     } elsif ($target eq 'tex') {
1.179     sakharuk  961: 	$currentstring .= '\textit{';
1.144     sakharuk  962:     }
1.122     albertel  963:     return $currentstring;
                    964: }
                    965: 
                    966: sub end_address {
                    967:     my ($target,$token) = @_;
                    968:     my $currentstring = '';
1.325     albertel  969:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  970: 	$currentstring .= $token->[2];
                    971:     } elsif ($target eq 'tex') {
1.179     sakharuk  972: 	$currentstring .= '}';
1.122     albertel  973:     }
                    974:     return $currentstring;
                    975: }
                    976: 
1.181     sakharuk  977: #-- <dfn> tag (end tag required)
1.122     albertel  978: sub start_dfn {
                    979:     my ($target,$token) = @_;
                    980:     my $currentstring = '';
1.325     albertel  981:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  982: 	$currentstring .= $token->[4];
                    983:     } elsif ($target eq 'tex') {
1.179     sakharuk  984: 	$currentstring .= '\textit{';
1.122     albertel  985:     } 
                    986:     return $currentstring;
                    987: }
                    988: 
                    989: sub end_dfn {
                    990:     my ($target,$token) = @_;
                    991:     my $currentstring = '';
1.325     albertel  992:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel  993: 	$currentstring .= $token->[2];
                    994:     } elsif ($target eq 'tex') {
1.179     sakharuk  995: 	$currentstring .= '}';
1.144     sakharuk  996:     }
1.122     albertel  997:     return $currentstring;
                    998: }
                    999: 
1.181     sakharuk 1000: #-- <tt> tag (end tag required)
1.122     albertel 1001: sub start_tt {
                   1002:     my ($target,$token) = @_;
                   1003:     my $currentstring = '';
1.325     albertel 1004:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1005: 	$currentstring .= $token->[4];
                   1006:     } elsif ($target eq 'tex') {
                   1007: 	$currentstring .= '\texttt{';
1.144     sakharuk 1008:     }
1.122     albertel 1009:     return $currentstring;
                   1010: }
                   1011: 
                   1012: sub end_tt {
                   1013:     my ($target,$token) = @_;
                   1014:     my $currentstring = '';
1.325     albertel 1015:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1016: 	$currentstring .= $token->[2];
                   1017:     } elsif ($target eq 'tex') {
                   1018: 	$currentstring .= '}';
                   1019:     }
                   1020:     return $currentstring;
                   1021: }
                   1022: 
1.181     sakharuk 1023: #-- <kbd> tag (end tag required)
1.122     albertel 1024: sub start_kbd {
                   1025:     my ($target,$token) = @_;
                   1026:     my $currentstring = '';
1.325     albertel 1027:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1028: 	$currentstring .= $token->[4];
                   1029:     } elsif ($target eq 'tex') {
1.179     sakharuk 1030: 	$currentstring .= '\texttt{';
1.144     sakharuk 1031:     }
1.122     albertel 1032:     return $currentstring;
                   1033: }
                   1034: 
                   1035: sub end_kbd {
                   1036:     my ($target,$token) = @_;
                   1037:     my $currentstring = '';
1.325     albertel 1038:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1039: 	$currentstring .= $token->[2];
                   1040:     } elsif ($target eq 'tex') {
1.179     sakharuk 1041: 	$currentstring .= '}';
1.144     sakharuk 1042:     }
1.122     albertel 1043:     return $currentstring;
                   1044: }
                   1045: 
1.181     sakharuk 1046: #-- <code> tag (end tag required)
1.122     albertel 1047: sub start_code {
                   1048:     my ($target,$token) = @_;
                   1049:     my $currentstring = '';
1.325     albertel 1050:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1051: 	$currentstring .= $token->[4];
                   1052:     } elsif ($target eq 'tex') {
                   1053: 	$currentstring .= '\texttt{';
                   1054:     } 
                   1055:     return $currentstring;
                   1056: }
                   1057: 
                   1058: sub end_code {
                   1059:     my ($target,$token) = @_;
                   1060:     my $currentstring = '';
1.325     albertel 1061:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1062: 	$currentstring .= $token->[2];
                   1063:     } elsif ($target eq 'tex') {
                   1064: 	$currentstring .= '}';
                   1065:     } 
                   1066:     return $currentstring;
                   1067: }
                   1068: 
1.181     sakharuk 1069: #-- <em> tag (end tag required)
1.122     albertel 1070: sub start_em {
                   1071:     my ($target,$token) = @_;
                   1072:     my $currentstring = '';
1.325     albertel 1073:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1074: 	$currentstring .= $token->[4];
                   1075:     } elsif ($target eq 'tex') {
                   1076: 	$currentstring .= '\emph{';
1.144     sakharuk 1077:     }
1.122     albertel 1078:     return $currentstring;
                   1079: }
                   1080: 
                   1081: sub end_em {
                   1082:     my ($target,$token) = @_;
                   1083:     my $currentstring = '';
1.325     albertel 1084:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1085: 	$currentstring .= $token->[2];
                   1086:     } elsif ($target eq 'tex') {
                   1087: 	$currentstring .= '}';
1.144     sakharuk 1088:     } 
1.122     albertel 1089:     return $currentstring;
                   1090: }
                   1091: 
1.181     sakharuk 1092: #-- <q> tag (end tag required)
1.122     albertel 1093: sub start_q {
                   1094:     my ($target,$token) = @_;
                   1095:     my $currentstring = '';
1.325     albertel 1096:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1097: 	$currentstring .= $token->[4];
                   1098:     } elsif ($target eq 'tex') {
1.179     sakharuk 1099: 	$currentstring .= '\emph{';
1.122     albertel 1100:     }
                   1101:     return $currentstring;
                   1102: }
                   1103: 
                   1104: sub end_q {
                   1105:     my ($target,$token) = @_;
                   1106:     my $currentstring = '';
1.325     albertel 1107:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1108: 	$currentstring .= $token->[2];
                   1109:     } elsif ($target eq 'tex') {
1.179     sakharuk 1110: 	$currentstring .= '}';
1.144     sakharuk 1111:     } 
1.122     albertel 1112:     return $currentstring;
                   1113: }
                   1114: 
1.277     foxr     1115: #  <p> is a bit strange since it does not require a closing </p>
                   1116: #  However in latex, we must often output closing stuff to end
                   1117: #  environments and {}'s etc.  Therefore we do all the work
                   1118: #  of figuring out the ending strings in the start tag processing,
                   1119: #  and provide a mechanism to output the stop text external
                   1120: #  to tag processing.
                   1121: #
                   1122: {
                   1123: 
                   1124:     my $closing_string = '';		# String required to close <p>
                   1125: 
1.279     foxr     1126: #   Some tags are <p> fragile meaning that <p> inside of them
                   1127: #   does not work within TeX mode.  This is managed via the 
                   1128: #   counter below:
                   1129: #
                   1130: 
                   1131:     my $para_disabled = 0;
                   1132: 
                   1133: sub disable_para {
                   1134:     $para_disabled++;
                   1135: }
                   1136: sub enable_para {
                   1137:     $para_disabled--;
                   1138: }
                   1139: 
                   1140: 
1.181     sakharuk 1141: #-- <p> tag (end tag optional)
1.198     sakharuk 1142: #optional attribute - align="center|left|right"
1.122     albertel 1143: sub start_p {
1.157     sakharuk 1144:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.279     foxr     1145:     my $currentstring = '';
1.325     albertel 1146:     if ($target eq 'web' || $target eq 'webgrade') {
1.279     foxr     1147: 	$currentstring .= &end_p();	# close off prior para if in progress.
1.122     albertel 1148: 	$currentstring .= $token->[4];
1.279     foxr     1149: 	if (! ($currentstring =~ /\//)) {
                   1150: 	    $closing_string = '</p>'; # Deal correctly with <p /> e.g.
                   1151: 	}
                   1152:     } elsif ($target eq 'tex' && !$para_disabled) {
1.313     foxr     1153: 
1.279     foxr     1154: 	$currentstring .= &end_p();	# close off prior para if in progress.
1.198     sakharuk 1155: 	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
                   1156: 	if ($align eq 'center') {
1.277     foxr     1157: 	    $currentstring .='\begin{center}\par';
                   1158: 	    $closing_string = '\end{center}';
1.309     albertel 1159: 	    if (&is_inside_of($tagstack, "table")) {
                   1160: 		$currentstring = &center_correction().$currentstring;
                   1161: 	    }
1.198     sakharuk 1162: 	} elsif ($align eq 'right') {
1.323     foxr     1163: 	    $currentstring.="\n".'{\flushright ';
                   1164: #	    $currentstring.='\makebox['.$env{'form.textwidth'}.']{\hfill\llap{';
                   1165: 	    $closing_string= "}\n";
1.198     sakharuk 1166: 	} elsif ($align eq 'left') {
1.323     foxr     1167: 	    $currentstring.= "\n".'{\flushleft ';
                   1168: #	    $currentstring.='\noindent\makebox['.$env{'form.textwidth'}.']{{';
                   1169: 	    $closing_string = "}\n";
1.216     matthew  1170: 	} else {
1.277     foxr     1171:             $currentstring.='\par ';
1.313     foxr     1172: 	    if (&is_inside_of($tagstack, 'table')) {
1.315     foxr     1173: 		$closing_string = '\vskip 0pt'; # Seems to be consistent with <p> in tables.
1.313     foxr     1174: 	    } else {
                   1175: 		$closing_string = '\strut\\\\\strut ';
                   1176: 	    }
1.216     matthew  1177:         }
1.277     foxr     1178: 
1.144     sakharuk 1179:     }
1.122     albertel 1180:     return $currentstring;
                   1181: }
1.277     foxr     1182: #
                   1183: #  End paragraph processing just requires that we output the
                   1184: #  closing string that was saved and blank it.
                   1185: sub end_p {
1.279     foxr     1186:     #  Note only 'tex' mode uses disable_para and enable_para
                   1187:     #  so we don't need to know the target in the check below:
                   1188: 
                   1189:     if (!$para_disabled) {
                   1190: 	my $current_string = $closing_string;
                   1191: 	$closing_string = '';	# Not in a para anymore.
                   1192: 	return $current_string;
                   1193:     } else {
                   1194: 	return '';
                   1195:     }
1.122     albertel 1196: 
                   1197: }
1.277     foxr     1198: }
1.181     sakharuk 1199: #-- <br> tag (end tag forbidden)
1.122     albertel 1200: sub start_br {
                   1201:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                   1202:     my $currentstring = '';
1.325     albertel 1203:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1204: 	$currentstring .= $token->[4];
                   1205:     } elsif ($target eq 'tex') {
1.227     sakharuk 1206: 	my @tempo=@$tagstack;
1.229     sakharuk 1207: 	my $signal=0;
1.287     foxr     1208: 	#  Not going to factor this to is_inside_of since that would require
                   1209:         #  multiple stack traversals.
                   1210: 	#
1.227     sakharuk 1211: 	for (my $i=$#tempo;$i>=0;$i--) {
                   1212: 	    if (($tempo[$i] eq 'b') || ($tempo[$i] eq 'strong') ||
1.230     sakharuk 1213:                 ($tempo[$i] eq 'ol') || ($tempo[$i] eq 'ul') ||
                   1214:                 ($tempo[$i] eq 'td') || ($tempo[$i] eq 'th'))  {
1.229     sakharuk 1215: 		$signal=1;
1.227     sakharuk 1216: 		last;
                   1217: 	    }
                   1218: 	}
1.229     sakharuk 1219: 	if ($signal) {
1.219     sakharuk 1220: 	    $currentstring .= ' \vskip 0 mm ';
                   1221: 	} elsif ($$tagstack[-2] ne 'sub' && $$tagstack[-2] ne 'sup') {
                   1222: 	    $currentstring .= '\strut \\\\ \strut ';
1.1       sakharuk 1223: 	}
1.144     sakharuk 1224:     }
1.122     albertel 1225:     return $currentstring;
                   1226: }
                   1227: 
                   1228: sub end_br {
                   1229:     my ($target,$token) = @_;
                   1230:     my $currentstring = '';
1.325     albertel 1231:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1232: 	$currentstring .= $token->[2];
                   1233:     }
                   1234:     return $currentstring;
                   1235: }
                   1236: 
1.181     sakharuk 1237: #-- <big> tag (end tag required)
1.122     albertel 1238: sub start_big {
                   1239:     my ($target,$token) = @_;
                   1240:     my $currentstring = '';
1.325     albertel 1241:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1242: 	$currentstring .= $token->[4];
                   1243:     } elsif ($target eq 'tex') {
1.137     sakharuk 1244: 	$currentstring .= '{\large ';
1.144     sakharuk 1245:     } 
1.122     albertel 1246:     return $currentstring;
                   1247: }
                   1248: 
                   1249: sub end_big {
                   1250:     my ($target,$token) = @_;
                   1251:     my $currentstring = '';
1.325     albertel 1252:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1253: 	$currentstring .= $token->[2];
                   1254:     } elsif ($target eq 'tex') {
                   1255: 	$currentstring .= '}';
                   1256:     }
                   1257:     return $currentstring;
                   1258: }
                   1259: 
1.181     sakharuk 1260: #-- <small> tag (end tag required)
1.122     albertel 1261: sub start_small {
                   1262:     my ($target,$token) = @_;
                   1263:     my $currentstring = '';
1.325     albertel 1264:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1265: 	$currentstring .= $token->[4];
                   1266:     } elsif ($target eq 'tex') {
                   1267: 	$currentstring .= '{\footnotesize ';
1.144     sakharuk 1268:     }
1.122     albertel 1269:     return $currentstring;
                   1270: }
                   1271: 
                   1272: sub end_small {
                   1273:     my ($target,$token) = @_;
                   1274:     my $currentstring = '';
1.325     albertel 1275:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1276: 	$currentstring .= $token->[2];
                   1277:     } elsif ($target eq 'tex') {
                   1278: 	$currentstring .= '}';
                   1279:     }
                   1280:     return $currentstring;
                   1281: }
                   1282: 
1.181     sakharuk 1283: #-- <basefont> tag (end tag forbidden)
1.122     albertel 1284: sub start_basefont {
1.126     sakharuk 1285:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.122     albertel 1286:     my $currentstring = '';
1.325     albertel 1287:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1288: 	$currentstring = $token->[4];     
1.126     sakharuk 1289:     } elsif ($target eq 'tex') {
                   1290: 	my $basesize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval);
                   1291: 	if (defined $basesize) {
                   1292: 	    $currentstring = '{\\'.$basesize.' ';
                   1293: 	}
                   1294:     }
1.122     albertel 1295:     return $currentstring;
                   1296: }
                   1297: 
                   1298: sub end_basefont {
1.126     sakharuk 1299:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.122     albertel 1300:     my $currentstring = '';
1.325     albertel 1301:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1302: 	$currentstring = $token->[4];     
1.126     sakharuk 1303:     } elsif ($target eq 'tex') {
                   1304: 	my $basesize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval);
                   1305: 	if (defined $basesize) {
                   1306: 	    $currentstring = '}';
                   1307: 	}
                   1308:     }
1.122     albertel 1309:     return $currentstring;
                   1310: }
                   1311: 
1.181     sakharuk 1312: #-- <font> tag (end tag required)
1.122     albertel 1313: sub start_font {
                   1314:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                   1315:     my $currentstring = '';
1.325     albertel 1316:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1317: 	my $face=&Apache::lonxml::get_param('face',$parstack,$safeeval);
1.204     albertel 1318: 	if ($face!~/symbol/i) {
1.267     albertel 1319: 	    if (($env{'browser.fontenhance'} eq 'on') || 
                   1320: 		($env{'browser.blackwhite'} eq 'on')) { return ''; }
1.155     www      1321: 	}
1.122     albertel 1322: 	$currentstring = $token->[4];     
1.126     sakharuk 1323:     }  elsif ($target eq 'tex') {
                   1324: 	my $fontsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval);
                   1325: 	if (defined $fontsize) {
                   1326: 	    $currentstring = '{\\'.$fontsize.' ';
                   1327: 	}
                   1328:     }
1.122     albertel 1329:     return $currentstring;
                   1330: }
                   1331: 
                   1332: sub end_font {
                   1333:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                   1334:     my $currentstring = '';
1.325     albertel 1335:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1336: 	$currentstring = $token->[2];    
1.126     sakharuk 1337:     }  elsif ($target eq 'tex') {
                   1338: 	my $fontsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval);
                   1339: 	if (defined $fontsize) {
                   1340: 	    $currentstring = '}';
                   1341: 	}
                   1342:     }
1.122     albertel 1343:     return $currentstring;
                   1344: }
                   1345:  
1.181     sakharuk 1346: #-- <strike> tag (end tag required)
1.122     albertel 1347: sub start_strike {
                   1348:     my ($target,$token) = @_;
                   1349:     my $currentstring = '';
1.325     albertel 1350:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1351: 	$currentstring .= $token->[4];
                   1352:     } elsif ($target eq 'tex') {
                   1353: 	&Apache::lonxml::startredirection();
                   1354:     } 
                   1355:     return $currentstring;
                   1356: }
                   1357: 
                   1358: sub end_strike {
                   1359:     my ($target,$token) = @_;
                   1360:     my $currentstring = '';
1.325     albertel 1361:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1362: 	$currentstring .= $token->[2];
                   1363:     } elsif ($target eq 'tex') {
                   1364: 	$currentstring=&Apache::lonxml::endredirection();
                   1365: 	$currentstring=~s/(\S)(\s+)(\S)/$1\}$2\\underline\{$3/g; 
                   1366: 	$currentstring=~s/^\s*(\S)/\\underline\{$1/; 
                   1367: 	$currentstring=~s/(\S)\s*$/$1\}/;
                   1368:     }
                   1369:     return $currentstring;
                   1370: }
                   1371: 
1.181     sakharuk 1372: #-- <s> tag (end tag required)
1.122     albertel 1373: sub start_s {
                   1374:     my ($target,$token) = @_;
                   1375:     my $currentstring = '';
1.325     albertel 1376:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1377: 	$currentstring .= $token->[4];
                   1378:     } elsif ($target eq 'tex') {
                   1379: 	&Apache::lonxml::startredirection();
                   1380:     } 
                   1381:     return $currentstring;
                   1382: }
                   1383: 
                   1384: sub end_s {
                   1385:     my ($target,$token) = @_;
                   1386:     my $currentstring = '';
1.325     albertel 1387:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1388: 	$currentstring .= $token->[2];
                   1389:     } elsif ($target eq 'tex') {
                   1390: 	$currentstring=&Apache::lonxml::endredirection();
                   1391: 	$currentstring=~s/(\S)(\s+)(\S)/$1\}$2\\underline\{$3/g;
                   1392: 	$currentstring=~s/^\s*(\S)/\\underline\{$1/;
                   1393: 	$currentstring=~s/(\S)\s*$/$1\}/;	
                   1394:     }
                   1395:     return $currentstring;
                   1396: }
                   1397: 
1.181     sakharuk 1398: #-- <sub> tag (end tag required)
1.122     albertel 1399: sub start_sub {
                   1400:     my ($target,$token) = @_;
                   1401:     my $currentstring = '';
1.325     albertel 1402:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1403: 	$currentstring .= $token->[4];
                   1404:     } elsif ($target eq 'tex') {
1.202     sakharuk 1405: 	$currentstring .= '\ensuremath{_{';
1.122     albertel 1406:     } 
                   1407:     return $currentstring;
                   1408: }
                   1409: 
                   1410: sub end_sub {
                   1411:     my ($target,$token) = @_;
                   1412:     my $currentstring = '';
1.325     albertel 1413:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1414: 	$currentstring .= $token->[2];
                   1415:     } elsif ($target eq 'tex') {
1.202     sakharuk 1416: 	$currentstring .= '}}';
1.122     albertel 1417:     }
                   1418:     return $currentstring;
                   1419: }
                   1420: 
1.181     sakharuk 1421: #-- <sup> tag (end tag required)
1.122     albertel 1422: sub start_sup {
                   1423:     my ($target,$token) = @_;
                   1424:     my $currentstring = '';
1.325     albertel 1425:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1426: 	$currentstring .= $token->[4];
                   1427:     } elsif ($target eq 'tex') {
1.202     sakharuk 1428: 	$currentstring .= '\ensuremath{^{';
1.122     albertel 1429:     } 
                   1430:     return $currentstring;
                   1431: }
                   1432: 
                   1433: sub end_sup {
                   1434:     my ($target,$token) = @_;
                   1435:     my $currentstring = '';
1.325     albertel 1436:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1437: 	$currentstring .= $token->[2];
                   1438:     } elsif ($target eq 'tex') {
1.202     sakharuk 1439: 	$currentstring .= '}}';
1.122     albertel 1440:     }
                   1441:     return $currentstring;
                   1442: }
                   1443: 
1.181     sakharuk 1444: #-- <hr> tag (end tag forbidden)
1.122     albertel 1445: sub start_hr {
1.124     sakharuk 1446:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.279     foxr     1447:     my $currentstring = &end_p();	# End enclosing para.
1.325     albertel 1448:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1449: 	$currentstring .= $token->[4];
                   1450:     } elsif ($target eq 'tex') {
1.149     sakharuk 1451: 	my $LaTeXwidth = &Apache::lonxml::get_param('TeXwidth',$parstack,$safeeval,undef,0);
1.124     sakharuk 1452: 	if (defined $LaTeXwidth) {
                   1453: 	    if ($LaTeXwidth=~/^%/) {
                   1454: 		substr($LaTeXwidth,0,1)='';
                   1455: 		$LaTeXwidth=($LaTeXwidth/100).'\textwidth';
                   1456: 	    }
                   1457: 	} else {
1.148     sakharuk 1458: 	    $LaTeXwidth ='0.9\textwidth';
1.124     sakharuk 1459: 	}
                   1460: 	my ($pre,$post);
                   1461: 	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
                   1462: 	if (($align eq 'center') || (not defined $align)) {
                   1463: 	    $pre=''; $post='';
                   1464: 	} elsif ($align eq 'left') {
                   1465: 	    $pre='\rlap{'; $post='} \hfill';
                   1466: 	} elsif ($align eq 'right') {
                   1467: 	    $pre=' \hfill \llap{'; $post='}';
                   1468: 	}
1.148     sakharuk 1469: 	$currentstring .= ' \vskip 0 mm \noindent\makebox['.$LaTeXwidth.']{'.$pre.'\makebox['.
1.124     sakharuk 1470:                                     $LaTeXwidth.'][b]{\hrulefill}'.$post.'}\vskip 0 mm ';
1.122     albertel 1471:     } 
                   1472:     return $currentstring;
                   1473: }
                   1474: 
                   1475: sub end_hr {
                   1476:     my ($target,$token) = @_;
                   1477:     my $currentstring = '';
1.325     albertel 1478:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1479: 	$currentstring .= $token->[2];
1.148     sakharuk 1480:     }
1.122     albertel 1481:     return $currentstring;
                   1482: }
                   1483: 
1.181     sakharuk 1484: #-- <div> tag (end tag required)
1.280     foxr     1485: {
                   1486: 
                   1487: #  Since div can be nested, the stack below is used
                   1488: #  in 'tex' mode to store the ending strings
                   1489: #  for the div stack.
                   1490: 
                   1491:     my @div_end_stack;
                   1492: 
1.122     albertel 1493: sub start_div {
1.280     foxr     1494:     my ($target,$token, $tagstack, $parstack, $parser, $safeeval) = @_;
1.279     foxr     1495:     my $currentstring = &end_p();	# Close enclosing para.
1.325     albertel 1496:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1497: 	$currentstring .= $token->[4];
                   1498:     } 
1.280     foxr     1499:     if ($target eq 'tex') {
                   1500: 	# 4 possible alignments: left, right, center, and -missing-.
                   1501: 
                   1502: 	my $endstring = '';
                   1503: 
                   1504: 	my $align = lc(&Apache::lonxml::get_param('align', $parstack,
                   1505: 						  $safeeval, undef, 1));
                   1506: 	if ($align eq 'center') {
                   1507: 	    $currentstring .= '\begin{center}';
                   1508: 	    $endstring      = '\end{center}';
1.309     albertel 1509: 	    if (&is_inside_of($tagstack, "table")) {
                   1510: 		$currentstring = &center_correction().$currentstring;
                   1511: 	    }
1.280     foxr     1512: 	}
                   1513: 	elsif ($align eq 'right') {
                   1514: 	    $currentstring .= '\begin{flushright}';
                   1515: 	    $endstring     .= '\end{flushright}';
                   1516: 	} elsif ($align eq 'left') {
                   1517: 	    $currentstring .= '\begin{flushleft}';
                   1518: 	    $endstring     = '\end{flushleft}';
                   1519: 	} else {
                   1520: 	
                   1521: 	}
                   1522: 	$currentstring .= "\n";   # For human readability.
                   1523: 	$endstring       = "\n$endstring\n"; # For human readability
                   1524: 	push(@div_end_stack, $endstring);
                   1525:     }
1.122     albertel 1526:     return $currentstring;
                   1527: }
                   1528: 
                   1529: sub end_div {
                   1530:     my ($target,$token) = @_;
                   1531:     my $currentstring = '';
1.325     albertel 1532:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1533: 	$currentstring .= $token->[2];
1.280     foxr     1534:     }
                   1535:     if ($target eq 'tex') {
                   1536: 	my $endstring = pop @div_end_stack;
                   1537: 	$currentstring .= $endstring;
                   1538:     }
1.122     albertel 1539:     return $currentstring;
                   1540: }
1.280     foxr     1541: }
1.122     albertel 1542: 
1.181     sakharuk 1543: #-- <a> tag (end tag required)
1.122     albertel 1544: sub start_a {
1.149     sakharuk 1545:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.122     albertel 1546:     my $currentstring = '';
1.325     albertel 1547:     if ($target eq 'web' || $target eq 'webgrade') {
1.250     albertel 1548: 	my $href=&Apache::lonxml::get_param('href',$parstack,$safeeval,
                   1549: 					    undef,1);
                   1550: 	$currentstring=&Apache::lonenc::encrypt_ref($token,{'href'=>$href});
1.122     albertel 1551:     } elsif ($target eq 'tex') {
1.149     sakharuk 1552: 	my $a=&Apache::lonxml::get_param('href',$parstack,$safeeval,undef,1);
1.161     sakharuk 1553: 	my $b=&Apache::lonxml::get_param('name',$parstack,$safeeval,undef,1);
                   1554: 	if ($a=~/\S/) {
                   1555: 	    $a=~s/([^\\])%/$1\\\%/g;
                   1556: 	    $currentstring .= '\ref{URI: '.$a.'}';
                   1557: 	} elsif ($b=~/\S/) {
                   1558: 	    $currentstring .= '\ref{Anchor: '.$b.'}';
                   1559: 	} else {
                   1560: 	    $currentstring.='';
                   1561: 	}
1.122     albertel 1562:     }
                   1563:     return $currentstring;
                   1564: }
                   1565: 
                   1566: sub end_a {
1.168     albertel 1567:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.122     albertel 1568:     my $currentstring = '';
1.325     albertel 1569:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1570: 	$currentstring .= $token->[2];
                   1571:     }
                   1572:     return $currentstring;
                   1573: }
                   1574: 
1.181     sakharuk 1575: #-- <li> tag (end tag optional)
1.122     albertel 1576: sub start_li {
1.168     albertel 1577:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.122     albertel 1578:     my $currentstring = '';
1.325     albertel 1579:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1580: 	$currentstring = $token->[4];     
                   1581:     } elsif ($target eq 'tex') {
1.237     sakharuk 1582: 	my $type=&Apache::lonxml::get_param('type',$parstack,$safeeval,undef,0);
                   1583: 	my $value=&Apache::lonxml::get_param('value',$parstack,$safeeval,undef,0);
1.238     albertel 1584: 	#FIXME need to support types i and I 
                   1585: 	if ($type=~/disc/) {
                   1586: 	    $currentstring .= ' \item[$\bullet$] ';
                   1587: 	} elsif ($type=~/circle/) {
                   1588: 	    $currentstring .= ' \item[$\circ$] ';
1.146     sakharuk 1589: 	} elsif ($type=~/square/) {
1.238     albertel 1590: 	    $currentstring .= ' \item[$\diamond$] ';
                   1591: 	} elsif ($type eq '1') {
                   1592: 	    $currentstring .= ' \item['.($Apache::londefdef::list_index+1).'.]';
1.237     sakharuk 1593: 	} elsif ($type eq 'A') {
1.238     albertel 1594: 	    $currentstring .= ' \item['.('A'..'Z')[$Apache::londefdef::list_index].'.]';
1.237     sakharuk 1595: 	} elsif ($type eq 'a') {
1.238     albertel 1596: 	    $currentstring .= ' \item['.('a'..'z')[$Apache::londefdef::list_index].'.]';
1.237     sakharuk 1597: 	} elsif ($value ne '') {
                   1598: 	    $currentstring .= ' \item['.$value.'] ';
1.122     albertel 1599: 	} else {
1.146     sakharuk 1600: 	    $currentstring .= ' \item ';
1.122     albertel 1601: 	}  
1.238     albertel 1602: 	$Apache::londefdef::list_index++;
                   1603:     }
1.122     albertel 1604:     return $currentstring;
                   1605: }
                   1606: 
                   1607: sub end_li {
                   1608:     my ($target,$token) = @_;
1.279     foxr     1609:     my $currentstring = &end_p();	# In case there's a <p> in the <li>
1.325     albertel 1610:     if ($target eq 'web' || $target eq 'webgrade') {
1.277     foxr     1611: 	$currentstring .= $token->[2];     
1.122     albertel 1612:     } 
                   1613:     return $currentstring;
                   1614: }
                   1615: 
1.181     sakharuk 1616: #-- <u> tag (end tag required)
1.122     albertel 1617: sub start_u {
                   1618:     my ($target,$token) = @_;
                   1619:     my $currentstring = '';
1.325     albertel 1620:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1621: 	$currentstring .= $token->[4];
                   1622:     } elsif ($target eq 'tex') {
                   1623: 	&Apache::lonxml::startredirection();
                   1624:     } 
                   1625:     return $currentstring;
                   1626: }
                   1627: 
                   1628: sub end_u {
                   1629:     my ($target,$token) = @_;
                   1630:     my $currentstring = '';
1.325     albertel 1631:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1632: 	$currentstring .= $token->[2];
                   1633:     } elsif ($target eq 'tex') {
                   1634: 	$currentstring=&Apache::lonxml::endredirection();
                   1635: 	$currentstring=~s/(\S)(\s+)(\S)/$1\}$2\\underline\{$3/g;
                   1636: 	$currentstring=~s/^\s*(\S)/\\underline\{$1/;
                   1637: 	$currentstring=~s/(\S)\s*$/$1\}/;		
                   1638:     }
                   1639:     return $currentstring;
                   1640: }
                   1641: 
1.181     sakharuk 1642: #-- <ul> tag (end tag required)
1.122     albertel 1643: sub start_ul {
1.125     sakharuk 1644:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.279     foxr     1645:     my $currentstring = &end_p();	# Close off enclosing list.
1.325     albertel 1646:     if ($target eq 'web' || $target eq 'webgrade') {
1.277     foxr     1647: 	$currentstring .= $token->[4];     
1.122     albertel 1648:     } elsif ($target eq 'tex') {
1.125     sakharuk 1649: 	my $TeXtype=&Apache::lonxml::get_param('type',$parstack,$safeeval,undef,0);
1.238     albertel 1650: 	$Apache::londefdef::list_index=0;
1.125     sakharuk 1651: 	if ($TeXtype eq 'disc') {
1.222     sakharuk 1652: 	    $currentstring .= '\renewcommand{\labelitemi}{$\bullet$}'.
                   1653:                               '\renewcommand{\labelitemii}{$\bullet$}'. 
                   1654:                               '\renewcommand{\labelitemiii}{$\bullet$}'.
                   1655:                               '\renewcommand{\labelitemiv}{$\bullet$}';
1.125     sakharuk 1656: 	} elsif ($TeXtype eq 'circle') {
1.222     sakharuk 1657: 	    $currentstring .= '\renewcommand{\labelitemi}{$\circ$}'.
                   1658:                               '\renewcommand{\labelitemii}{$\circ$}'. 
                   1659:                               '\renewcommand{\labelitemiii}{$\circ$}'.
                   1660:                               '\renewcommand{\labelitemiv}{$\circ$}';
1.125     sakharuk 1661: 	} elsif ($TeXtype eq 'square') {
1.222     sakharuk 1662: 	    $currentstring .= '\renewcommand{\labelitemi}{$\diamond$}'.
                   1663:                               '\renewcommand{\labelitemii}{$\diamond$}'. 
                   1664:                               '\renewcommand{\labelitemiii}{$\diamond$}'.
                   1665:                               '\renewcommand{\labelitemiv}{$\diamond$}';
1.125     sakharuk 1666: 	}
1.222     sakharuk 1667: 	$currentstring .= '\strut \begin{itemize}';  
1.122     albertel 1668:     } 
                   1669:     return $currentstring;
                   1670: }
                   1671: 
                   1672: sub end_ul {
                   1673:     my ($target,$token) = @_;
                   1674:     my $currentstring = '';
1.325     albertel 1675:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1676: 	$currentstring = $token->[2];     
                   1677:     } elsif ($target eq 'tex') {
1.222     sakharuk 1678: 	$currentstring = '\end{itemize} \renewcommand{\labelitemi}{$\bullet$}'.
                   1679:                                '\renewcommand{\labelitemii}{$\bullet$}'. 
                   1680:                                '\renewcommand{\labelitemiii}{$\bullet$}'.
                   1681:                                '\renewcommand{\labelitemiv}{$\bullet$}\strut ';  
1.122     albertel 1682:     } 
                   1683:     return $currentstring;
                   1684: }
                   1685: 
1.181     sakharuk 1686: #-- <menu> tag (end tag required)
1.122     albertel 1687: sub start_menu {
                   1688:     my ($target,$token) = @_;
                   1689:     my $currentstring = '';
1.325     albertel 1690:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1691: 	$currentstring = $token->[4];     
                   1692:     } elsif ($target eq 'tex') {
                   1693: 	$currentstring = " \\begin{itemize} ";  
                   1694:     } 
                   1695:     return $currentstring;
                   1696: }
                   1697: 
                   1698: sub end_menu {
                   1699:     my ($target,$token) = @_;
                   1700:     my $currentstring = '';
1.325     albertel 1701:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1702: 	$currentstring = $token->[2];     
                   1703:     } elsif ($target eq 'tex') {
                   1704: 	$currentstring = " \\end{itemize}";  
                   1705:     } 
                   1706:     return $currentstring;
                   1707: }
                   1708: 
1.181     sakharuk 1709: #-- <dir> tag (end tag required)
1.122     albertel 1710: sub start_dir {
                   1711:     my ($target,$token) = @_;
1.279     foxr     1712:     my $currentstring = &end_p();	# In case there's a <p> prior to the list.
1.325     albertel 1713:     if ($target eq 'web' || $target eq 'webgrade') {
1.277     foxr     1714: 	$currentstring .= $token->[4];     
1.122     albertel 1715:     } elsif ($target eq 'tex') {
1.277     foxr     1716: 	$currentstring .= " \\begin{itemize} ";  
1.122     albertel 1717:     } 
                   1718:     return $currentstring;
                   1719: }
                   1720: 
                   1721: sub end_dir {
                   1722:     my ($target,$token) = @_;
                   1723:     my $currentstring = '';
1.325     albertel 1724:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1725: 	$currentstring = $token->[2];     
                   1726:     } elsif ($target eq 'tex') {
                   1727: 	$currentstring = " \\end{itemize}";  
                   1728:     } 
                   1729:     return $currentstring;
                   1730: }
                   1731: 
1.181     sakharuk 1732: #-- <ol> tag (end tag required)
1.122     albertel 1733: sub start_ol {
1.125     sakharuk 1734:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.279     foxr     1735:     my $currentstring = &end_p();	# In case there's a <p> prior to the list.
1.325     albertel 1736:     if ($target eq 'web' || $target eq 'webgrade') {
1.277     foxr     1737: 	$currentstring .= $token->[4];     
1.122     albertel 1738:     } elsif ($target eq 'tex') {
1.238     albertel 1739: 	$Apache::londefdef::list_index=0;
1.125     sakharuk 1740: 	my $type=&Apache::lonxml::get_param('type',$parstack,$safeeval,undef,0);
                   1741: 	if ($type eq '1') {
1.222     sakharuk 1742: 	    $currentstring .= '\renewcommand{\labelenumi}{\arabic{enumi}.}'.
                   1743:                               '\renewcommand{\labelenumii}{\arabic{enumii}.}'. 
                   1744:                               '\renewcommand{\labelenumiii}{\arabic{enumiii}.}'.
                   1745:                               '\renewcommand{\labelenumiv}{\arabic{enumiv}.}';
1.125     sakharuk 1746: 	} elsif ($type eq 'A') {
1.222     sakharuk 1747: 	    $currentstring .= '\renewcommand{\labelenumi}{\Alph{enumi}.}'.
                   1748:                               '\renewcommand{\labelenumii}{\Alph{enumii}.}'. 
                   1749:                               '\renewcommand{\labelenumiii}{\Alph{enumiii}.}'.
                   1750:                               '\renewcommand{\labelenumiv}{\Alph{enumiv}.}';
1.125     sakharuk 1751: 	} elsif ($type eq 'a') {
1.222     sakharuk 1752: 	    $currentstring .= '\renewcommand{\labelenumi}{\alph{enumi}.}'.
                   1753:                               '\renewcommand{\labelenumii}{\alph{enumii}.}'.
                   1754:                               '\renewcommand{\labelenumiii}{\alph{enumiii}.}'.
                   1755:                               '\renewcommand{\labelenumiv}{\alph{enumiv}.}';
1.125     sakharuk 1756: 	} elsif ($type eq 'i') {
1.222     sakharuk 1757: 	    $currentstring .= '\renewcommand{\labelenumi}{\roman{enumi}.}'.
                   1758:                               '\renewcommand{\labelenumii}{\roman{enumii}.}'.
                   1759:                               '\renewcommand{\labelenumiii}{\roman{enumiii}.}'.
                   1760:                               '\renewcommand{\labelenumiv}{\roman{enumiv}.}';
1.125     sakharuk 1761: 	} elsif ($type eq 'I') {
1.222     sakharuk 1762: 	    $currentstring .= '\renewcommand{\labelenumi}{\Roman{enumi}.}'.
                   1763:                               '\renewcommand{\labelenumii}{\Roman{enumii}.}'.
                   1764:                               '\renewcommand{\labelenumiii}{\Roman{enumiii}.}'.
                   1765:                               '\renewcommand{\labelenumiv}{\Roman{enumiv}.}';
1.125     sakharuk 1766: 	}
1.222     sakharuk 1767: 	$currentstring .= '\strut \begin{enumerate}';  
1.122     albertel 1768:     } 
                   1769:     return $currentstring;
                   1770: }
                   1771: 
                   1772: sub end_ol {
                   1773:     my ($target,$token) = @_;
                   1774:     my $currentstring = '';
1.325     albertel 1775:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1776: 	$currentstring = $token->[2];     
                   1777:     } elsif ($target eq 'tex') {
1.222     sakharuk 1778: 	$currentstring = '\end{enumerate}\renewcommand{\labelenumi}{\arabic{enumi}.}'.
                   1779:                                         '\renewcommand{\labelenumii}{\arabic{enumii}.}'.
                   1780:                                         '\renewcommand{\labelenumiii}{\arabic{enumiii}.}'.
                   1781:                                         '\renewcommand{\labelenumiv}{\arabic{enumiv}.}\strut ';  
1.122     albertel 1782:     } 
                   1783:     return $currentstring;
                   1784: }
                   1785: 
1.181     sakharuk 1786: #-- <dl> tag (end tag required)
1.122     albertel 1787: sub start_dl {
                   1788:     my ($target,$token) = @_;
1.279     foxr     1789:     my $currentstring = &end_p();	# In case there's a <p> unclosed prior to the list.
1.325     albertel 1790:     if ($target eq 'web' || $target eq 'webgrade') {
1.277     foxr     1791: 	$currentstring .= $token->[4];     
1.122     albertel 1792:     } elsif ($target eq 'tex') {
1.277     foxr     1793: 	$currentstring .= '\begin{description}';
1.243     albertel 1794: 	$Apache::londefdef::DL++;
                   1795: 	push(@Apache::londefdef::description,[]);
                   1796: 	$Apache::londefdef::DD[$Apache::londefdef::DL]=0;
                   1797: 	$Apache::londefdef::DT[$Apache::londefdef::DL]=0;
1.244     albertel 1798: 	$Apache::londefdef::seenDT[$Apache::londefdef::DL]=0;
1.122     albertel 1799:     } 
                   1800:     return $currentstring;
                   1801: }
                   1802: 
                   1803: sub end_dl {
1.174     sakharuk 1804:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.122     albertel 1805:     my $currentstring = '';
1.325     albertel 1806:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1807: 	$currentstring = $token->[2];     
                   1808:     } elsif ($target eq 'tex') {
1.243     albertel 1809: 	if ($Apache::londefdef::DT[-1]) { &end_dt(@_); }
                   1810: 	if ($Apache::londefdef::DD[-1]) { &end_dd(@_); }
                   1811: 	foreach my $element (@{$Apache::londefdef::description[-1]}) {
1.174     sakharuk 1812: 	    $currentstring.=' '.$element.' ';
                   1813: 	}
1.243     albertel 1814: 	pop(@Apache::londefdef::description);
1.174     sakharuk 1815: 	$currentstring.='\end{description}';  
1.243     albertel 1816: 	delete($Apache::londefdef::DD[$Apache::londefdef::DL]);
                   1817: 	delete($Apache::londefdef::DT[$Apache::londefdef::DL]);
1.244     albertel 1818: 	delete($Apache::londefdef::seenDT[$Apache::londefdef::DL]);
1.243     albertel 1819: 	$Apache::londefdef::DL--;
1.122     albertel 1820:     } 
                   1821:     return $currentstring;
                   1822: }
                   1823: 
1.172     sakharuk 1824: #-- <dt> tag (end tag optional)
1.122     albertel 1825: sub start_dt {
1.172     sakharuk 1826:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
                   1827:     my $currentstring='';
1.325     albertel 1828:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1829: 	$currentstring = $token->[4];     
                   1830:     } elsif ($target eq 'tex') {
1.243     albertel 1831: 	if ($Apache::londefdef::DT[-1]) { &end_dt(@_); }
                   1832: 	if ($Apache::londefdef::DD[-1]) { &end_dd(@_); }
1.174     sakharuk 1833: 	&Apache::lonxml::startredirection();
1.243     albertel 1834: 	$Apache::londefdef::DT[-1]++;
1.244     albertel 1835: 	$Apache::londefdef::seenDT[-1]=1;
1.122     albertel 1836:     } 
                   1837:     return $currentstring;
                   1838: }
                   1839: 
                   1840: sub end_dt {
1.172     sakharuk 1841:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.122     albertel 1842:     my $currentstring = '';
1.325     albertel 1843:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1844: 	$currentstring = $token->[2];    
                   1845:     } elsif ($target eq 'tex') {
1.243     albertel 1846: 	if ($Apache::londefdef::DT[-1]) {
                   1847: 	    my $data=&item_cleanup();
1.244     albertel 1848: 	    push(@{$Apache::londefdef::description[-1]},'\item['.$data.'] \strut \vskip 0mm');
1.243     albertel 1849: 	    $Apache::londefdef::DT[-1]--;
                   1850: 	}
1.122     albertel 1851:     } 
                   1852:     return $currentstring;
                   1853: }
                   1854: 
1.173     sakharuk 1855: sub item_cleanup {
1.174     sakharuk 1856:     my $item=&Apache::lonxml::endredirection();
1.173     sakharuk 1857:     $item=~s/\\begin{center}//g;
                   1858:     $item=~s/\\end{center}//g;
                   1859:     return $item;
                   1860: }
                   1861: 
1.181     sakharuk 1862: #-- <dd> tag (end tag optional)
1.122     albertel 1863: sub start_dd {
1.147     sakharuk 1864:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.122     albertel 1865:     my $currentstring = '';
1.325     albertel 1866:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1867: 	$currentstring = $token->[4];     
1.147     sakharuk 1868:     } elsif ($target eq 'tex') {
1.243     albertel 1869: 	if ($Apache::londefdef::DT[-1]) { &end_dt(@_); }
                   1870: 	if ($Apache::londefdef::DD[-1]) { &end_dd(@_);}
1.244     albertel 1871: 	if (!$Apache::londefdef::seenDT[-1]) {
                   1872: 	    push(@{$Apache::londefdef::description[-1]},'\item[\strut] \strut \vskip 0mm ');
                   1873: 	}
1.243     albertel 1874: 	push(@{$Apache::londefdef::description[-1]},'');
                   1875: 	$Apache::londefdef::description[-1]->[-1].=' \strut ';
                   1876: 	$Apache::londefdef::DD[-1]++;
1.174     sakharuk 1877: 	&Apache::lonxml::startredirection();
1.122     albertel 1878:     } 
                   1879:     return $currentstring;
                   1880: }
                   1881: 
                   1882: sub end_dd {
1.174     sakharuk 1883:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.122     albertel 1884:     my $currentstring = '';
1.325     albertel 1885:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1886: 	$currentstring = $token->[2];    
1.174     sakharuk 1887:     }  elsif ($target eq 'tex') {
1.243     albertel 1888: 	$Apache::londefdef::description[-1]->[-1].=
                   1889: 	    &Apache::lonxml::endredirection().' \vskip 0mm ';
                   1890: 	$Apache::londefdef::DD[-1]--;
1.174     sakharuk 1891:     }
1.122     albertel 1892:     return $currentstring;
                   1893: }
                   1894: 
1.181     sakharuk 1895: #-- <table> tag (end tag required)
1.277     foxr     1896: #       <table> also ends any prior <p> that is not closed.
                   1897: #               but, unless I allow <p>'s to nest, that's the
                   1898: #               only way I could think of to allow <p> in 
                   1899: #               <tr> <th> bodies
                   1900: #
1.206     sakharuk 1901: #list of supported attributes: border,width,TeXwidth
1.91      sakharuk 1902: sub start_table {
                   1903:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.277     foxr     1904:     my $textwidth = '';
1.279     foxr     1905:     my $currentstring = &end_p();
1.325     albertel 1906:     if ($target eq 'web' || $target eq 'webgrade') {
1.277     foxr     1907: 	$currentstring .= $token->[4];     
1.91      sakharuk 1908:     } elsif ($target eq 'tex') {
                   1909: 	my $aa = {};
                   1910: 	push @Apache::londefdef::table, $aa; 
                   1911: 	$Apache::londefdef::table[-1]{'row_number'} = -1;
1.222     sakharuk 1912:         #maximum table's width (default coincides with text line length)
1.206     sakharuk 1913: 	if ($#Apache::londefdef::table==0) {
1.267     albertel 1914: 	    $textwidth=&recalc($env{'form.textwidth'}); #result is always in mm
1.206     sakharuk 1915: 	    $textwidth=~/(\d+\.?\d*)/;
                   1916: 	    $textwidth=0.95*$1; #accounts "internal" LaTeX space for table frame
                   1917: 	} else {
                   1918: 	    if ($Apache::londefdef::table[-2]{'TeXlen'}[$Apache::londefdef::table[-2]{'row_number'}][$Apache::londefdef::table[-2]{'counter_columns'}]=~/\d/) {
                   1919: 		#the maximum width of nested table is determined by LATeX width of parent cell
                   1920: 		$textwidth=$Apache::londefdef::table[-2]{'TeXlen'}[$Apache::londefdef::table[-2]{'row_number'}][$Apache::londefdef::table[-2]{'counter_columns'}]; 
                   1921: 	    } else {
                   1922:               #try to use all space not used before (minus 5% for LaTeX table internal) - rather silly
1.228     sakharuk 1923: 		$textwidth=$Apache::londefdef::table[-2]{'width'};
1.206     sakharuk 1924: 		for (my $i=0;$i<$Apache::londefdef::table[-2]{'counter_columns'};$i++) {
                   1925: 		    $textwidth=$textwidth-$Apache::londefdef::table[-2]{'TeXlen'}[0][$i];
                   1926: 		}
                   1927: 	    }
                   1928: 	}
1.294     foxr     1929: 
                   1930: 	# width either comes forced from the TeXwidth or the width parameters.
                   1931: 	# in either case it can be a percentage or absolute width.
1.311     albertel 1932: 	# in the width case we ignore absolute width 
1.126     sakharuk 1933: 	my $TeXwidth = &Apache::lonxml::get_param('TeXwidth',$parstack,$safeeval,undef,0);
1.308     albertel 1934: 	if (!defined($TeXwidth)) {
1.311     albertel 1935: 	    my $htmlwidth = &Apache::lonxml::get_param('width',$parstack,
                   1936: 						       $safeeval,undef,1);
                   1937: 	    if ($htmlwidth =~ /%/) {
                   1938: 		$TeXwidth = $htmlwidth;
                   1939: 	    } else { 
                   1940: 		$TeXwidth = $textwidth;
                   1941: 	    }
1.294     foxr     1942: 	} else {
                   1943: 	    $Apache::londefdef::table[-1]{'forcedtablewidth'} = 1;
                   1944: 	}
                   1945: 	if ($TeXwidth=~/%/) {
1.203     sakharuk 1946: 	    $Apache::londefdef::table[-1]{'percent'}=1;
1.126     sakharuk 1947: 	    $TeXwidth=~/(\d+)/;
1.206     sakharuk 1948:             $Apache::londefdef::table[-1]{'width'}=$1*$textwidth/100;
1.126     sakharuk 1949: 	} else {
1.206     sakharuk 1950: 	    $Apache::londefdef::table[-1]{'width'}=$TeXwidth;
1.316     foxr     1951: 	}
                   1952:         #  In the end, however the table width cannot be wider than $textwidth...
                   1953: 	
                   1954: 	if ($Apache::londefdef::table[-1]{'width'} > $textwidth) {
                   1955: 	    $Apache::londefdef::table[-1]{'width'} = $textwidth;
                   1956: 	}
1.294     foxr     1957: 
1.126     sakharuk 1958:         #table's border
1.206     sakharuk 1959: 	my $border = &Apache::lonxml::get_param('border',$parstack,$safeeval); 
1.208     sakharuk 1960:         my $permission=&Apache::lonxml::get_param('TeXDropEmptyColumns',$parstack,$safeeval,undef,0);
1.91      sakharuk 1961: 	unless (defined $border) { $border = 0; }
                   1962: 	if ($border) { 
                   1963: 	    $Apache::londefdef::table[-1]{'hinc'} = '\hline '; 
                   1964: 	    $Apache::londefdef::table[-1]{'vinc'} = '&'; 
                   1965: 	    $Apache::londefdef::table[-1]{'vvinc'} = '|';
                   1966: 	} else {
                   1967: 	    $Apache::londefdef::table[-1]{'hinc'} = ''; 
                   1968: 	    $Apache::londefdef::table[-1]{'vinc'} = '&'; 
                   1969: 	    $Apache::londefdef::table[-1]{'vvinc'} = '';
                   1970: 	}
1.206     sakharuk 1971: 	if ($#Apache::londefdef::table==0) {
1.281     foxr     1972: 	    #    Note that \newline seems to destroy the alignment envs.
                   1973: 	    # $Apache::londefdef::table[-1]{'output'}='\strut\newline\strut\setlength{\tabcolsep}{1 mm}';
                   1974: 	    $Apache::londefdef::table[-1]{'output'}='\strut'.'\\\\'."\n".'\strut\setlength{\tabcolsep}{1 mm}';
1.206     sakharuk 1975: 	}
                   1976: 	$Apache::londefdef::table[-1]{'output'}.=' \noindent \begin{tabular} ';
                   1977:         $Apache::londefdef::table[-1]{'TeXlen'}=[];
                   1978:         $Apache::londefdef::table[-1]{'objectlen'}=[];
1.229     sakharuk 1979:         $Apache::londefdef::table[-1]{'objectsignal'}=[];
1.206     sakharuk 1980:         $Apache::londefdef::table[-1]{'maxlen'}=[];
                   1981:         $Apache::londefdef::table[-1]{'minlen'}=[];
                   1982:         $Apache::londefdef::table[-1]{'content'}=[];
                   1983:         $Apache::londefdef::table[-1]{'align'}=[];
1.277     foxr     1984:         $currentstring.='\keephidden{NEW TABLE ENTRY}';
1.295     foxr     1985: 
1.294     foxr     1986: 
                   1987:     }
1.91      sakharuk 1988:     return $currentstring;
                   1989: }
1.122     albertel 1990:  
                   1991: sub end_table {
                   1992:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
                   1993:     my $currentstring = '';
1.325     albertel 1994:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 1995: 	$currentstring = $token->[2];     
                   1996:     } elsif ($target eq 'tex') {
                   1997: 	my $inmemory = '';
                   1998: 	my $output = '';
1.206     sakharuk 1999: 	my $WARNING='';
                   2000:         #width of columns from TeXwidth attributes
1.294     foxr     2001: 
1.206     sakharuk 2002: 	for (my $in=0;$in<=$Apache::londefdef::table[-1]{'row_number'};$in++) {
                   2003: 	    for (my $jn=0;$jn<=$Apache::londefdef::table[-1]{'counter_columns'};$jn++) {
                   2004: 		if ($Apache::londefdef::table[-1]{'TeXlen'}[0][$jn]<$Apache::londefdef::table[-1]{'TeXlen'}[$in][$jn]) {
                   2005: 		    $Apache::londefdef::table[-1]{'TeXlen'}[0][$jn]=$Apache::londefdef::table[-1]{'TeXlen'}[$in][$jn];
                   2006: 		}	
                   2007: 	    }
                   2008: 	}
                   2009:         #free space and number of empty columns
                   2010: 	my ($available_space,$empty_columns)=($Apache::londefdef::table[-1]{'width'},0);
1.228     sakharuk 2011: 	if ($#Apache::londefdef::table ne 0) {$available_space=0.9*$available_space;} 
1.206     sakharuk 2012: 	for (my $jn=0;$jn<=$Apache::londefdef::table[-1]{'counter_columns'};$jn++) {
                   2013: 	    if ($Apache::londefdef::table[-1]{'TeXlen'}[0][$jn]==0) {
                   2014: 		$empty_columns++;
                   2015: 	    } else {
                   2016: 		$available_space=$available_space-$Apache::londefdef::table[-1]{'TeXlen'}[0][$jn];
                   2017: 	    }
                   2018: 	}
                   2019:         #boundaries for contents columns
                   2020: 	my @min_len=();#columns can not be narrower 
                   2021: 	my @max_len=();#maximum length of column
                   2022: 	for (my $jn=0;$jn<=$Apache::londefdef::table[-1]{'counter_columns'};$jn++) {
                   2023: 		my ($localmin,$localmax)=(0,0);
                   2024: 		for (my $in=0;$in<=$Apache::londefdef::table[-1]{'row_number'};$in++) {
                   2025: 		    if ($localmin<$Apache::londefdef::table[-1]{'minlen'}[$in][$jn]) {
                   2026: 			$localmin=$Apache::londefdef::table[-1]{'minlen'}[$in][$jn];
                   2027: 		    }
                   2028: 		    if ($localmax<$Apache::londefdef::table[-1]{'maxlen'}[$in][$jn]) {
                   2029: 			$localmax=$Apache::londefdef::table[-1]{'maxlen'}[$in][$jn];
                   2030: 		    }
                   2031: 		}
                   2032: 		push @min_len, $localmin;
                   2033: 		push @max_len, $localmax;
1.122     albertel 2034: 	}
1.206     sakharuk 2035: 	for (my $jn=0;$jn<=$Apache::londefdef::table[-1]{'counter_columns'};$jn++) {
                   2036: 	    my $localmin=0,;
                   2037: 	    for (my $in=0;$in<=$Apache::londefdef::table[-1]{'row_number'};$in++) {
                   2038: 		if ($localmin<$Apache::londefdef::table[-1]{'objectlen'}[$in][$jn]) {
                   2039: 		    $localmin=$Apache::londefdef::table[-1]{'objectlen'}[$in][$jn];
                   2040: 		}
                   2041: 	    }
1.229     sakharuk 2042: 	    if ($max_len[$jn]<$localmin) {
                   2043: 		$max_len[$jn]=$localmin;
                   2044: 	    	$Apache::londefdef::table[-1]{'objectsignal'}[$jn]=1;
                   2045: 	    }#object size is bigger
                   2046: 	    if ($min_len[$jn]<$localmin) {
                   2047: 		$min_len[$jn]=$localmin;
                   2048: 		$Apache::londefdef::table[-1]{'objectsignal'}[$jn]=1;
                   2049: 	    }#object size is bigger
1.206     sakharuk 2050: 	    if ($Apache::londefdef::table[-1]{'TeXlen'}[0][$jn]!=0) {
                   2051: 		$min_len[$jn]=0;
                   2052: 		$max_len[$jn]=0;
                   2053: 	    }
                   2054: 	}
                   2055:        #final adjustment of column width
                   2056: 	my @fwidth=@{$Apache::londefdef::table[-1]{'TeXlen'}[0]};#final width array
                   2057: 	my @adjust=();
                   2058:         #step 1. adjustment by maximum value
                   2059: 	my $space_neeeded=0;
                   2060: 	for (my $jn=0;$jn<=$#max_len;$jn++) {
                   2061: 	    $space_neeeded=$space_neeeded+$max_len[$jn];
                   2062: 	}
                   2063: 	if ($space_neeeded<=$available_space) {
                   2064: 	    for (my $jn=0;$jn<=$#max_len;$jn++) {
                   2065: 		if ($fwidth[$jn]==0) {
                   2066: 		    $fwidth[$jn]=$max_len[$jn];
1.53      sakharuk 2067: 		}
1.51      sakharuk 2068: 	    }
1.206     sakharuk 2069: 	} else {
                   2070:         #step 2. adjustment by minimum value (estimation)
                   2071: 	    $space_neeeded=0;
                   2072: 	    for (my $jn=0;$jn<=$#min_len;$jn++) {
                   2073: 		$space_neeeded+=$min_len[$jn];
                   2074: 	    }
                   2075: 	    if ($space_neeeded>$available_space) {
                   2076: 		$WARNING=' \textbf{NOT ENOUGH SPACE FOR TABLE} ';
                   2077: 		for (my $jn=0;$jn<=$#max_len;$jn++) {
                   2078: 		    if ($fwidth[$jn]==0) {
                   2079: 			$fwidth[$jn]=$min_len[$jn];
                   2080: 		    }
                   2081: 		}
1.229     sakharuk 2082: 		#check if we have objects which can be scaled
                   2083: 		my $how_many_to_scale=0;
                   2084: 		my @to_scale=();
                   2085: 		for (my $jn=0;$jn<=$#max_len;$jn++) {
                   2086: 		    if ($Apache::londefdef::table[-1]{'objectsignal'}[$jn] eq '1') {
                   2087: 			$how_many_to_scale++;
                   2088: 			push @to_scale, $jn;
                   2089: 		    }
                   2090: 		}
                   2091: 		if ($how_many_to_scale>0) {
                   2092: 		    my $space_to_adjust=($space_neeeded-$available_space)/$how_many_to_scale;
                   2093: 		    foreach my $jn (@to_scale) {
                   2094: 			for (my $in=0;$in<=$Apache::londefdef::table[-1]{'row_number'};$in++) {
                   2095: 			    $Apache::londefdef::table[-1]{'content'}[$in][$jn]=~m/width\s*=\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)/;
                   2096: 			    if ($1 ne '') {
                   2097: 				my $current_length=&recalc($1);
                   2098: 				$current_length=~/(\d+\.?\d*)/;
                   2099: 				$current_length=$current_length-$space_to_adjust;
                   2100: 				$Apache::londefdef::table[-1]{'content'}[$in][$jn]=~s/width\s*=\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)/width=$current_length mm/;
                   2101: 			    }
                   2102: 			    $Apache::londefdef::table[-1]{'content'}[$in][$jn]=~m/\[(\d+\.?\d*)\s*mm\]/;
                   2103: 			    if ($1 ne '') {
                   2104: 				my $current_length=$1;
                   2105: 				$current_length=$current_length-$space_to_adjust;
                   2106: 				$Apache::londefdef::table[-1]{'content'}[$in][$jn]=~s/\[(\d+\.?\d*)\s*mm\]/\[$current_length mm\]/;
                   2107: 			    }				
                   2108: 			}
                   2109: 			$fwidth[$jn]=$fwidth[$jn]-$space_to_adjust;
                   2110: 		    }
                   2111: 		}
1.206     sakharuk 2112: 	    } else {
                   2113: 	      #step 3. adjustment over minimal + corrections
                   2114: 		my $enlarge_coef=$available_space/$space_neeeded;
                   2115: 		my $acsessive=0;
                   2116: 		for (my $jn=0;$jn<=$#min_len;$jn++) {
                   2117: 		    $adjust[$jn]=$min_len[$jn]*$enlarge_coef;
                   2118: 		    if ($adjust[$jn]>$max_len[$jn]) {
                   2119: 			$fwidth[$jn]=$max_len[$jn];
                   2120: 			$acsessive=$acsessive+$adjust[$jn]-$max_len[$jn];
                   2121: 			$adjust[$jn]=0;
                   2122: 		    }
                   2123: 		}
                   2124: 		if ($acsessive>0) {
                   2125: 		#we have an excess of space and can redistribute it
                   2126: 		    my $notempty_columns=0;
                   2127: 		    for (my $jn=0;$jn<=$#min_len;$jn++) {
                   2128: 			if ($adjust[$jn]!=0) {
                   2129: 			    $notempty_columns++;
                   2130: 			}
                   2131: 		    }
                   2132: 		    my $per_column=$acsessive/$notempty_columns;
                   2133: 		    for (my $jn=0;$jn<=$#min_len;$jn++) {
                   2134: 			if ($adjust[$jn]!=0) {
                   2135: 			    $adjust[$jn]+=$per_column;
                   2136: 			    $fwidth[$jn]=$adjust[$jn];
                   2137: 			}
1.223     sakharuk 2138: 		    }
                   2139: 		} else {
                   2140: 		    for (my $jn=0;$jn<=$#min_len;$jn++) {
                   2141: 			$fwidth[$jn]=$adjust[$jn];
1.206     sakharuk 2142: 		    }
                   2143: 		}
1.203     sakharuk 2144: 	    }
                   2145: 	}
1.222     sakharuk 2146:         #use all available width if it is defined in % or as TeXwidth
                   2147:         if (($Apache::londefdef::table[-1]{'percent'}==1) || ($Apache::londefdef::table[-1]{'forcetablewidth'}==1)) {
1.203     sakharuk 2148: 	    my $current=0; 
1.206     sakharuk 2149: 	    for (my $i=0;$i<=$#fwidth;$i++) {  
                   2150: 		$current+=$fwidth[$i];
1.203     sakharuk 2151: 	    }
                   2152: 	    my $coef=$Apache::londefdef::table[-1]{'width'}/$current;
1.206     sakharuk 2153: 	    for (my $i=0;$i<=$#fwidth;$i++) {  
                   2154: 		$fwidth[$i]*=$coef;
                   2155: 	    }
                   2156: 	}
                   2157:         #removing of empty columns if allowed
1.208     sakharuk 2158:         my $permission=&Apache::lonxml::get_param('TeXDropEmptyColumns',$parstack,$safeeval,undef,0);
1.206     sakharuk 2159: 	if ($permission eq 'yes') {
                   2160: 	    my @cleaned_table=();
                   2161:             my @cleaned_header=();
                   2162: 	    my $colind=0;
                   2163: 	    for (my $jn=0;$jn<=$Apache::londefdef::table[-1]{'counter_columns'};$jn++) {
                   2164: 		if ($fwidth[$jn]!=0) {
                   2165: 		    #we need to copy column
                   2166: 		    for (my $in=0;$in<=$Apache::londefdef::table[-1]{'row_number'};$in++) {
                   2167: 			$cleaned_table[$in][$colind]=$Apache::londefdef::table[-1]{'content'}[$in][$jn];
                   2168: 			$cleaned_header[$colind]=$fwidth[$jn];
                   2169: 		    }
                   2170: 		    $colind++;
                   2171: 		}
1.122     albertel 2172: 	    }
1.206     sakharuk 2173: 	    $Apache::londefdef::table[-1]{'content'}=\@cleaned_table;
                   2174: 	    @fwidth=@cleaned_header;
1.122     albertel 2175: 	}
1.206     sakharuk 2176: 	#construct header of the table
                   2177: 	my $header_of_table = '{'.$Apache::londefdef::table[-1]{'vvinc'};
                   2178: 	for (my $in=0;$in<=$#fwidth;$in++) {
                   2179: 	    $header_of_table.='p{'.$fwidth[$in].' mm}'.$Apache::londefdef::table[-1]{'vvinc'};
                   2180: 	}
                   2181: 	$header_of_table .= '}';
1.126     sakharuk 2182: 	#fill the table
                   2183: 	for (my $in=0;$in<=$Apache::londefdef::table[-1]{'row_number'};$in++) {
1.306     foxr     2184: 	    my $have_rowspan = 0;
1.206     sakharuk 2185: 	    for (my $jn=0;$jn<=$#fwidth;$jn++) {
1.320     foxr     2186: 
                   2187: 		#-----------------------------------------------------------
                   2188:                 #   I think this order of doing things will ensure that
                   2189: 		#   single rowspan, columspan and combined row/colspans will
                   2190:                 #   work correctly.  LaTeX is delicate here.
                   2191: 		#    RF.
                   2192: 
                   2193: 		# Start a rowspan if necessary:
                   2194: 
                   2195: 		my $rowspan = $Apache::londefdef::table[-1]{'rowspan'}[$in][$jn];
                   2196: 		my $colspan = $Apache::londefdef::table[-1]{'colspan'}[$in][$jn];
1.304     foxr     2197: 		#
                   2198: 		#  Do the appropriate magic if this has a colspan
                   2199: 		# 
1.320     foxr     2200: 
1.304     foxr     2201: 		if ($colspan > 1) {
                   2202: 		    $output .= '\multicolumn{'.
                   2203: 			$colspan
                   2204: 			.'}{|l|}{';
                   2205: 		}
1.306     foxr     2206: 
                   2207: 		if ($rowspan > 1) {
                   2208: 		    $have_rowspan++;
                   2209: 		    $output .= '\multirow{'.$rowspan.'}[0]{'.$fwidth[$jn].'mm}{';
                   2210: 		}
                   2211: 		if (($rowspan eq '^') || ($rowspan eq '_')) {
                   2212: 		    $have_rowspan++;
                   2213: 		}
1.320     foxr     2214: 		#--------------------------------------------------------------
1.306     foxr     2215: 
1.206     sakharuk 2216: 		if ($Apache::londefdef::table[-1]{'align'}[$in][$jn] eq 'c') {
1.309     albertel 2217: 		    $output.=&center_correction().'\begin{center}';
1.206     sakharuk 2218: 		} elsif ($Apache::londefdef::table[-1]{'align'}[$in][$jn] eq 'r') {
                   2219: 		    $output.=' \hfill \llap{'
                   2220: 		}
                   2221: 		$output.=$Apache::londefdef::table[-1]{'content'}[$in][$jn];
                   2222: 		if ($Apache::londefdef::table[-1]{'align'}[$in][$jn] eq 'c') {
1.314     albertel 2223: 		    $output.='\end{center}';
1.206     sakharuk 2224: 		} elsif ($Apache::londefdef::table[-1]{'align'}[$in][$jn] eq 'r') {
                   2225: 		    $output.='} ';
                   2226: 		}
1.306     foxr     2227: 		# Close off any open multirow:
                   2228: 		
                   2229: 		if ($rowspan > 1) {
                   2230: 		    $output .= '}';
                   2231: 		}
1.304     foxr     2232: 		#  Close off the colspan...
                   2233: 		#
                   2234: 		if ($colspan > 1)  {
                   2235: 		    $output .= '}';
                   2236: 		    $jn += $colspan-1; # Adjust for number of rows really left.
                   2237: 		}
1.206     sakharuk 2238:                 if ($jn!=$#fwidth) {$output.=' '.$Apache::londefdef::table[-1]{'vinc'};}
                   2239: 	    }
1.306     foxr     2240: 	    #  If have_rowspan > 0, and borders are on, then 
                   2241: 	    #  we need to do more than put an \hline at the bottom of row.
                   2242: 	    #  we need to do the appropriate \cline to ensure that
                   2243: 	    #  the spanned rows don't have \hlines through them.
                   2244: 
                   2245: 	    if (($Apache::londefdef::table[-1]{'hinc'} =~ /\\hline/) && $have_rowspan) {
                   2246: 		$output .= ' \\\\ ';
                   2247: 		for (my $jn=0; $jn<=$#fwidth;$jn++) {
                   2248: 		    my $rowspan = $Apache::londefdef::table[-1]{'rowspan'}[$in][$jn];
1.320     foxr     2249: 		    if ($rowspan ne "^") {
                   2250: 			if (($rowspan <= 1) || ($rowspan eq '_')) {
                   2251: 			    my $column = $jn+1;
                   2252: 			    $output .= '\cline{'.$column.'-'.$column.'} ';
                   2253: 			}
1.306     foxr     2254: 		    }
                   2255: 		}
                   2256: 
                   2257: 	    } else {
                   2258: 		$output.=' \\\\ '.$Apache::londefdef::table[-1]{'hinc'}.' ';
                   2259: 	    }
1.122     albertel 2260: 	}
1.281     foxr     2261: 	# Note that \newline destroys alignment env's produced  by e.g. <div>
                   2262: 	# $Apache::londefdef::table[-1]{'output'} .= $header_of_table.$Apache::londefdef::table[-1]{'hinc'}.$output.'\end{tabular}\strut\newline\strut ';
                   2263: 	$Apache::londefdef::table[-1]{'output'} .= $header_of_table.$Apache::londefdef::table[-1]{'hinc'}.$output.'\end{tabular}\strut'.'\\\\'."\n".'\strut ';
1.127     sakharuk 2264: 	if ($#Apache::londefdef::table > 0) {	    
                   2265: 	    my $inmemory = $Apache::londefdef::table[-1]{'output'};
1.294     foxr     2266: 	    # Figure out max/and min width  by summing us and then
                   2267: 	    # apply that to the current column of the table we nest in
                   2268: 	    # if it's larger than the current width or the current width
                   2269: 	    # is undefined.
                   2270: 	    #
                   2271: 	    my $min_nested_width = 0;
                   2272: 	    my $max_nested_width = 0;
                   2273: 	    for (my $col = 0; $col <= $Apache::londefdef::table[-1]{'counter_columns'}; $col++) {
                   2274: 		$min_nested_width +=  $min_len[$col];
                   2275: 		$max_nested_width +=  $max_len[$col];
1.300     foxr     2276: 		
1.294     foxr     2277: 	    }
                   2278: 	    # Fudge in an extra 5 mm for borders etc:
                   2279: 	    
                   2280: 	    $min_nested_width += 5;
                   2281: 	    $max_nested_width += 5;
                   2282: 
                   2283: 	    my $outer_column = $Apache::londefdef::table[-2]{'counter_columns'};
                   2284: 	    my $outer_row    = $Apache::londefdef::table[-2]{'row_number'};
                   2285: 	    if ($min_nested_width > $Apache::londefdef::table[-2]{'minlen'}[$outer_row][$outer_column]) {
                   2286: 		$Apache::londefdef::table[-2]{'minlen'}[$outer_row][$outer_column] = $min_nested_width;
                   2287: 	    }
                   2288: 	    if ($max_nested_width > $Apache::londefdef::table[-2]{'maxlen'}[$outer_row][$outer_column]) {
                   2289: 		$Apache::londefdef::table[-2]{'maxlen'}[$outer_row][$outer_column] = $max_nested_width;
                   2290: 	    }
                   2291: 
1.127     sakharuk 2292: 	    pop @Apache::londefdef::table;
1.129     sakharuk 2293: 	    push @{$Apache::londefdef::table[-1]{'include'}}, $inmemory;
1.127     sakharuk 2294: 	} else {
                   2295: 	    $currentstring .= $Apache::londefdef::table[-1]{'output'};
                   2296: 	    pop @Apache::londefdef::table;
1.143     sakharuk 2297: 	    undef @Apache::londefdef::table;
1.127     sakharuk 2298: 	}
1.122     albertel 2299:     }
                   2300:     return $currentstring;
                   2301: }
                   2302: 
1.166     sakharuk 2303: #-- <tr> tag (end tag optional)
1.122     albertel 2304: sub start_tr {
                   2305:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
                   2306:     my $currentstring = '';
1.325     albertel 2307:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 2308: 	$currentstring = $token->[4];     
                   2309:     } elsif ($target eq 'tex') {
                   2310: 	$Apache::londefdef::table[-1]{'row_number'}++;
1.206     sakharuk 2311: 	my $alignchar=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
1.122     albertel 2312: 	if ($alignchar ne '') {
1.206     sakharuk 2313: 	    push @ {$Apache::londefdef::table[-1]{'rows'} },substr($alignchar,0,1);
1.122     albertel 2314: 	} else {
                   2315: 	    push @ {$Apache::londefdef::table[-1]{'rows'} }, 'l';
                   2316: 	}
                   2317: 	push ( @{ $Apache::londefdef::table[-1]{'rowdata'} }, $Apache::londefdef::table[-1]{'hinc'});
1.300     foxr     2318: 	#
                   2319: 	#  Need to save the number of table columns to preserve the max # columns.
                   2320: 	#
                   2321: 	$Apache::londefdef::table[-1]{'prior_columns'}   = $Apache::londefdef::table[-1]{'counter_columns'};
1.122     albertel 2322: 	$Apache::londefdef::table[-1]{'counter_columns'} = -1;
1.206     sakharuk 2323: 	push @ {$Apache::londefdef::table[-1]{'TeXlen'}}, [];
                   2324: 	push @ {$Apache::londefdef::table[-1]{'objectlen'}}, [];
                   2325: 	push @ {$Apache::londefdef::table[-1]{'minlen'}}, [];
                   2326: 	push @ {$Apache::londefdef::table[-1]{'maxlen'}}, [];
                   2327: 	push @ {$Apache::londefdef::table[-1]{'content'}}, [];
1.122     albertel 2328:     } 
                   2329:     return $currentstring;
                   2330: }
                   2331:         
                   2332: sub end_tr {
1.160     sakharuk 2333:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.279     foxr     2334:     my $currentstring = &end_p();	# Close any pending <p> in the row.
1.325     albertel 2335:     if ($target eq 'web' || $target eq 'webgrade') {
1.277     foxr     2336: 	$currentstring .= $token->[2];     
1.122     albertel 2337:     } elsif ($target eq 'tex') {
1.160     sakharuk 2338: 	if ($Apache::londefdef::TD_redirection) {
                   2339: 	    &end_td_tex($parstack,$parser,$safeeval);    
                   2340: 	}
1.300     foxr     2341: 	# Counter columns must be the maximum number of columns seen
                   2342: 	# in the table so far so:
                   2343: 	if ($Apache::londefdef::table[-1]{'prior_columns'} > $Apache::londefdef::table[-1]{'counter_columns'}) {
                   2344: 	    $Apache::londefdef::table[-1]{'counter_columns'} = $Apache::londefdef::table[-1]{'prior_columns'};
                   2345: 	}
1.295     foxr     2346: 
                   2347: 
1.294     foxr     2348: 	
1.122     albertel 2349:     }
                   2350:     return $currentstring;
                   2351: }
                   2352: 
1.166     sakharuk 2353: #-- <td> tag (end tag optional)
1.122     albertel 2354: sub start_td {
                   2355:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
                   2356:     my $currentstring = '';
1.325     albertel 2357:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 2358: 	$currentstring = $token->[4];     
                   2359:     } elsif ($target eq 'tex') {
1.160     sakharuk 2360: 	$Apache::londefdef::TD_redirection = 1;
1.159     sakharuk 2361: 	&tag_check('tr','td',$tagstack,$parstack,$parser,$safeeval);
1.122     albertel 2362:     } 
                   2363:     return $currentstring;
                   2364: }   
1.159     sakharuk 2365:     
                   2366: sub tag_check {
                   2367:     my ($good_tag,$bad_tag,$tagstack,$parstack,$parser,$safeeval) = @_;
1.160     sakharuk 2368:     my @ar=@$parstack; 
                   2369:     for (my $i=$#ar-1;$i>=0;$i--) {
                   2370: 	if (lc($$tagstack[$i]) eq $good_tag) {
                   2371: 	    &start_td_tex($parstack,$parser,$safeeval);
                   2372: 	    last;
                   2373: 	} elsif (lc($$tagstack[$i]) eq $bad_tag) {
                   2374: 	    splice @ar, $i+1;
                   2375: 	    &end_td_tex(\@ar,$parser,$safeeval);
                   2376: 	    &start_td_tex($parstack,$parser,$safeeval);
                   2377: 	    last;
1.159     sakharuk 2378: 	}
1.160     sakharuk 2379:     }
1.159     sakharuk 2380:     return '';
                   2381: }
                   2382:  
                   2383: sub start_td_tex {
                   2384:     my ($parstack,$parser,$safeeval) = @_;
1.206     sakharuk 2385:     my $alignchar = substr(&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1),0,1);
                   2386:     if ($alignchar eq '') {
                   2387: 	$alignchar = $Apache::londefdef::table[-1]{'rows'}[-1];
1.159     sakharuk 2388:     }
1.206     sakharuk 2389:     push @{ $Apache::londefdef::table[-1]{'align'}[$Apache::londefdef::table[-1]{'row_number'}] }, $alignchar;
1.159     sakharuk 2390:     $Apache::londefdef::table[-1]{'counter_columns'}++;
1.206     sakharuk 2391:     my $TeXwidth=&Apache::lonxml::get_param('TeXwidth',$parstack,$safeeval,undef,0);
                   2392:     if (defined $TeXwidth) {		
                   2393: 	my $current_length=&recalc($TeXwidth);
                   2394: 	$current_length=~/(\d+\.?\d*)/;
                   2395: 	push @ {$Apache::londefdef::table[-1]{'TeXlen'}[$Apache::londefdef::table[-1]{'row_number'}] },$1;
                   2396:     }
1.159     sakharuk 2397:     &Apache::lonxml::startredirection();
                   2398:     return '';
                   2399: }
                   2400: 
                   2401: sub end_td_tex {
                   2402:     my ($parstack,$parser,$safeeval) = @_;
1.304     foxr     2403:     my $current_row    = $Apache::londefdef::table[-1]{'row_number'};
                   2404:     my $current_column = $Apache::londefdef::table[-1]{'counter_columns'}; 
1.303     foxr     2405:     my $data = &Apache::lonxml::endredirection();
                   2406: 
1.305     foxr     2407:     #  The rowspan array of the table indicates which cells are part of a span.
                   2408:     #  n indicates the start of a span set of n rows.
                   2409:     #  ^ indicates a cell that continues a span set.
1.306     foxr     2410:     #  _ indicates the cell is at the bottom of a span set.
1.305     foxr     2411:     #  If this and subsequent cells are part of a rowspan, we must
                   2412:     #  push along the row until we find one that is not.
                   2413: 
                   2414:     while ((defined $Apache::londefdef::table[-1]{'rowspan'}[$current_row] [$current_column]) 
1.306     foxr     2415: 	   && ($Apache::londefdef::table[-1]{'rowspan'}[$current_row][$current_column] =~ /[\^\_]/)) {
1.305     foxr     2416: 	# Part of a span.
                   2417: 	push @ {$Apache::londefdef::table[-1]{'content'}[-1]}, '';
                   2418: 	$current_column++;
                   2419:     }
                   2420:     $Apache::londefdef::table[-1]{'counter_columns'} = $current_column;
                   2421:    
                   2422: 
1.320     foxr     2423:     # Get the column and row spans.
                   2424:     # Colspan can be done via \multicolumn if I can figure out the data structs.
                   2425: 
                   2426:     my $colspan = &Apache::lonxml::get_param('colspan', $parstack, $safeeval, undef, 0);
                   2427:     if (!$colspan) {
                   2428: 	$colspan = 1;
                   2429:     }
1.305     foxr     2430: 
                   2431:     my $rowspan = &Apache::lonxml::get_param('rowspan', $parstack, $safeeval, undef, 0);
                   2432:     if (!$rowspan) {
                   2433: 	$rowspan = 1;
                   2434:     }
                   2435: 
1.303     foxr     2436: 
1.305     foxr     2437: 
1.320     foxr     2438:     for (my $c = 0; $c < $colspan; $c++) {
                   2439: 	$Apache::londefdef::table[-1]{'rowspan'}[$current_row][$current_column+$c] = $rowspan;
                   2440: 	for (my $i = 1; $i < $rowspan; $i++) {
                   2441: 	    $Apache::londefdef::table[-1]{'rowspan'}[$current_row+$i][$current_column+$c] = '^';
                   2442: 	    if ($i == ($rowspan-1)) {
                   2443: 		$Apache::londefdef::table[-1]{'rowspan'}[$current_row+$i][$current_column+$c] = '_';
                   2444: 	    }
1.306     foxr     2445: 	}
1.305     foxr     2446:     }
1.304     foxr     2447: 
1.159     sakharuk 2448:     my $TeXwidth=&Apache::lonxml::get_param('TeXwidth',$parstack,$safeeval,undef,0);
                   2449:     if (defined $TeXwidth) {		
1.206     sakharuk 2450: 	push @ {$Apache::londefdef::table[-1]{'objectlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
                   2451: 	push @ {$Apache::londefdef::table[-1]{'minlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
                   2452: 	push @ {$Apache::londefdef::table[-1]{'maxlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
1.159     sakharuk 2453:     } else {
1.206     sakharuk 2454: 	if (($data=~m/width\s*=\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)/) or ($data=~m/\[(\d+\.?\d*)\s*mm\]/)) {
                   2455: 	    my $garbage_data=$data;
                   2456: 	    my $fwidth=0;
                   2457:             while ($garbage_data=~m/width\s*=\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)/) {
                   2458: 		my $current_length=&recalc($1);
                   2459: 		$current_length=~/(\d+\.?\d*)/;
                   2460: 		if ($fwidth<$1) {$fwidth=$1;}
                   2461: 		$garbage_data=~s/width\s*=\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)//;
                   2462: 	    }
                   2463:             while ($garbage_data=~m/\[(\d+\.?\d*)\s*mm\]/) {
                   2464: 		my $current_length=$1;
                   2465: 		if ($fwidth<$current_length) {$fwidth=$current_length;}
                   2466: 		$garbage_data=~s/\[(\d+\.?\d*)\s*mm\]//;
                   2467: 	    }
                   2468: 	    push @ {$Apache::londefdef::table[-1]{'TeXlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
                   2469: 	    push @ {$Apache::londefdef::table[-1]{'objectlen'}[$Apache::londefdef::table[-1]{'row_number'}] },$fwidth;
                   2470: 	    push @ {$Apache::londefdef::table[-1]{'minlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
                   2471: 	    push @ {$Apache::londefdef::table[-1]{'maxlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
1.231     sakharuk 2472: 	} elsif ($data=~/\\parbox\{\s*\d+\.?\d*\s*(mm|cm|in|pc|pt)*\s*\}/ or $data=~/\\epsfxsize\s*=\s*\d+\.?\d*\s*(mm|cm|in|pc|pt)*/) {
                   2473: 	    my $garbage_data=$data;
                   2474: 	    my $fwidth=0;
                   2475:             while ($garbage_data=~/\\parbox\{\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)\s*\}/) {
                   2476: 		my $current_length=&recalc($1);
                   2477: 		$current_length=~/(\d+\.?\d*)/;
                   2478: 		if ($fwidth<$1) {$fwidth=$1;}
                   2479: 		$garbage_data=~s/\\parbox\{\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)//;
                   2480: 	    }
                   2481:             while ($garbage_data=~/\\epsfxsize\s*=\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)/) {
                   2482: 		my $current_length=&recalc($1);
                   2483: 		$current_length=~/(\d+\.?\d*)/;
                   2484: 		if ($fwidth<$1) {$fwidth=$1;}
                   2485: 		$garbage_data=~s/\\epsfxsize\s*=\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)//;
                   2486: 	    }
                   2487: 	    push @ {$Apache::londefdef::table[-1]{'TeXlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
                   2488: 	    push @ {$Apache::londefdef::table[-1]{'objectlen'}[$Apache::londefdef::table[-1]{'row_number'}] },$fwidth;
                   2489: 	    push @ {$Apache::londefdef::table[-1]{'minlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
                   2490: 	    push @ {$Apache::londefdef::table[-1]{'maxlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
                   2491: 	    $data=~s/\\\\\s*$//; 
1.159     sakharuk 2492: 	} else {  
1.166     sakharuk 2493: 	    $data=~s/^\s+(\S.*)/$1/; 
1.159     sakharuk 2494: 	    $data=~s/(.*\S)\s+$/$1/;
1.166     sakharuk 2495: 	    $data=~s/(\s)+/$1/;
1.206     sakharuk 2496: 	    my ($current_length,$min_length)=(0,0);
1.166     sakharuk 2497: 	    if ($data=~/\\vskip/) {
                   2498:                 my $newdata=$data;
                   2499: 		$newdata=~s/\\vskip \d*\.?\d*\s*mm/THISISJUSTTEMPORARYSEPARATOR/g;
                   2500: 		my @newdata=split(/THISISJUSTTEMPORARYSEPARATOR/,$newdata);
                   2501: 		foreach my $elementdata (@newdata) {
1.206     sakharuk 2502: 		    my $lengthnewdata=2.5*&LATEX_length($elementdata);
1.166     sakharuk 2503: 		    if ($lengthnewdata>$current_length) {$current_length=$lengthnewdata;}
1.206     sakharuk 2504:                     my @words=split(/ /,$elementdata);
                   2505: 		    foreach my $word (@words) {
                   2506: 			my $lengthword=2.5*&LATEX_length($word);
                   2507: 			if ($min_length<$lengthword) {$min_length=$lengthword;}
                   2508: 		    }
1.166     sakharuk 2509: 		}
                   2510: 	    } else {
1.206     sakharuk 2511: 		$current_length=2.5*&LATEX_length($data);
                   2512:                     my @words=split(/ /,$data);
                   2513: 		    foreach my $word (@words) {
1.228     sakharuk 2514: 			my $lengthword=2*&LATEX_length($word);
1.206     sakharuk 2515: 			if ($min_length<$lengthword) {$min_length=$lengthword;}
                   2516: 		    }
1.166     sakharuk 2517: 	    }
1.206     sakharuk 2518: 	    push @ {$Apache::londefdef::table[-1]{'TeXlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
                   2519: 	    push @ {$Apache::londefdef::table[-1]{'objectlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
                   2520: 	    push @ {$Apache::londefdef::table[-1]{'maxlen'}[$Apache::londefdef::table[-1]{'row_number'}] },$current_length;
                   2521: 	    push @ {$Apache::londefdef::table[-1]{'minlen'}[$Apache::londefdef::table[-1]{'row_number'}] },$min_length;
1.159     sakharuk 2522: 	}        
                   2523:     }
1.302     foxr     2524:     # Substitute all of the tables nested in this cell in their appropriate places.
                   2525: 
                   2526: 
                   2527:     my $nested_count = $#{$Apache::londefdef::table[-1]{'include'}}; # This one is constant...
                   2528:     for (my $in=0; $in<=$nested_count; $in++) {    
1.301     foxr     2529: 	my $nested = shift @{$Apache::londefdef::table[-1]{'include'}};
                   2530: 	$nested =~ s/\\end\{tabular\}\\strut\\\\/\\end\{tabular\}/;
                   2531: 	# $data=~s/\\keephidden\{NEW TABLE ENTRY\}/$Apache::londefdef::table[-1]{'include'}[$in]/;
                   2532: 	$data =~ s/\\keephidden\{NEW TABLE ENTRY\}/$nested/;
                   2533: 
                   2534:     }
                   2535:     # Should be be killing off the 'include' elements as they're used up?
1.305     foxr     2536: 
1.206     sakharuk 2537:     push @ {$Apache::londefdef::table[-1]{'content'}[-1] },$data;
1.305     foxr     2538: 
1.304     foxr     2539: 
                   2540: 
                   2541: 
                   2542:     #  the colspan array will indicate how many columns will be spanned by this
                   2543:     #  cell..this requires that counter_columns also be adjusted accordingly
                   2544:     #  so that the next bunch of text goes in the right cell.  Note that since
                   2545:     #  counter_columns is incremented in the start_td_tex, we adjust by colspan-1.
                   2546:     #
                   2547: 
                   2548:     $Apache::londefdef::table[-1]{'counter_columns'} += $colspan -1;
                   2549:     for (my $i = 0; $i < ($colspan -1); $i++) {
                   2550: 	push @ {$Apache::londefdef::table[-1]{'content'}[-1] },'';
                   2551:     }
1.320     foxr     2552:     for (my $r = 0; $r < $rowspan; $r++) {
                   2553: 	$Apache::londefdef::table[-1]{'colspan'}[$current_row+$r][$current_column] = $colspan;
                   2554: 	# Put empty text in spanned cols.
                   2555: 	
                   2556:     }
                   2557: 
1.304     foxr     2558: 
                   2559: 
1.301     foxr     2560:     return '';
1.159     sakharuk 2561: }
                   2562: 
1.122     albertel 2563: sub end_td {
1.126     sakharuk 2564:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.122     albertel 2565:     my $currentstring = '';
1.325     albertel 2566:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 2567: 	$currentstring = $token->[2];     
                   2568:     } elsif ($target eq 'tex') {
1.160     sakharuk 2569:         $Apache::londefdef::TD_redirection =0;
1.159     sakharuk 2570: 	&end_td_tex($parstack,$parser,$safeeval);
1.122     albertel 2571:     }
                   2572:     return $currentstring;
                   2573: }
                   2574: 
1.166     sakharuk 2575: #-- <th> tag (end tag optional)
1.122     albertel 2576: sub start_th {
                   2577:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
                   2578:     my $currentstring = '';
1.325     albertel 2579:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 2580: 	$currentstring = $token->[4];     
                   2581:     } elsif ($target eq 'tex') {
1.230     sakharuk 2582: 	$Apache::londefdef::TD_redirection = 1;
                   2583: 	&tagg_check('tr','th',$tagstack,$parstack,$parser,$safeeval);
1.122     albertel 2584:     } 
                   2585:     return $currentstring;
1.130     sakharuk 2586: }   
1.230     sakharuk 2587:     
                   2588: sub tagg_check {
                   2589:     my ($good_tag,$bad_tag,$tagstack,$parstack,$parser,$safeeval) = @_;
                   2590:     my @ar=@$parstack; 
                   2591:     for (my $i=$#ar-1;$i>=0;$i--) {
                   2592: 	if (lc($$tagstack[$i]) eq $good_tag) {
                   2593: 	    &start_th_tex($parstack,$parser,$safeeval);
                   2594: 	    last;
                   2595: 	} elsif (lc($$tagstack[$i]) eq $bad_tag) {
                   2596: 	    splice @ar, $i+1;
                   2597: 	    &end_th_tex(\@ar,$parser,$safeeval);
                   2598: 	    &start_th_tex($parstack,$parser,$safeeval);
                   2599: 	    last;
                   2600: 	}
                   2601:     }
                   2602:     return '';
                   2603: }
                   2604:  
                   2605: sub start_th_tex {
                   2606:     my ($parstack,$parser,$safeeval) = @_;
                   2607:     my $alignchar = substr(&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1),0,1);
                   2608:     if ($alignchar eq '') {
                   2609: 	$alignchar = $Apache::londefdef::table[-1]{'rows'}[-1];
                   2610:     }
                   2611:     push @{ $Apache::londefdef::table[-1]{'align'}[$Apache::londefdef::table[-1]{'row_number'}] }, $alignchar;
                   2612:     $Apache::londefdef::table[-1]{'counter_columns'}++;
                   2613:     my $TeXwidth=&Apache::lonxml::get_param('TeXwidth',$parstack,$safeeval,undef,0);
                   2614:     if (defined $TeXwidth) {		
                   2615: 	my $current_length=&recalc($TeXwidth);
                   2616: 	$current_length=~/(\d+\.?\d*)/;
                   2617: 	push @ {$Apache::londefdef::table[-1]{'TeXlen'}[$Apache::londefdef::table[-1]{'row_number'}] },$1;
                   2618:     }
                   2619:     &Apache::lonxml::startredirection();
                   2620:     return '';
                   2621: }
                   2622: 
                   2623: sub end_th_tex {
                   2624:     my ($parstack,$parser,$safeeval) = @_;
                   2625:     my $current_row = $Apache::londefdef::table[-1]{'row_number'};
                   2626:     my $data=&Apache::lonxml::endredirection();
                   2627:     my $TeXwidth=&Apache::lonxml::get_param('TeXwidth',$parstack,$safeeval,undef,0);
                   2628:     if (defined $TeXwidth) {		
                   2629: 	push @ {$Apache::londefdef::table[-1]{'objectlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
                   2630: 	push @ {$Apache::londefdef::table[-1]{'minlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
                   2631: 	push @ {$Apache::londefdef::table[-1]{'maxlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
                   2632:     } else {
                   2633: 	if (($data=~m/width\s*=\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)/) or ($data=~m/\[(\d+\.?\d*)\s*mm\]/)) {
                   2634: 	    my $garbage_data=$data;
                   2635: 	    my $fwidth=0;
                   2636:             while ($garbage_data=~m/width\s*=\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)/) {
                   2637: 		my $current_length=&recalc($1);
                   2638: 		$current_length=~/(\d+\.?\d*)/;
                   2639: 		if ($fwidth<$1) {$fwidth=$1;}
                   2640: 		$garbage_data=~s/width\s*=\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)//;
                   2641: 	    }
                   2642:             while ($garbage_data=~m/\[(\d+\.?\d*)\s*mm\]/) {
                   2643: 		my $current_length=$1;
                   2644: 		if ($fwidth<$current_length) {$fwidth=$current_length;}
                   2645: 		$garbage_data=~s/\[(\d+\.?\d*)\s*mm\]//;
                   2646: 	    }
                   2647: 	    push @ {$Apache::londefdef::table[-1]{'TeXlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
                   2648: 	    push @ {$Apache::londefdef::table[-1]{'objectlen'}[$Apache::londefdef::table[-1]{'row_number'}] },$fwidth;
                   2649: 	    push @ {$Apache::londefdef::table[-1]{'minlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
                   2650: 	    push @ {$Apache::londefdef::table[-1]{'maxlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
                   2651: 	} else {  
                   2652: 	    $data=~s/^\s+(\S.*)/$1/; 
                   2653: 	    $data=~s/(.*\S)\s+$/$1/;
                   2654: 	    $data=~s/(\s)+/$1/;
                   2655: 	    my ($current_length,$min_length)=(0,0);
                   2656: 	    if ($data=~/\\vskip/) {
                   2657:                 my $newdata=$data;
                   2658: 		$newdata=~s/\\vskip \d*\.?\d*\s*mm/THISISJUSTTEMPORARYSEPARATOR/g;
                   2659: 		my @newdata=split(/THISISJUSTTEMPORARYSEPARATOR/,$newdata);
                   2660: 		foreach my $elementdata (@newdata) {
                   2661: 		    my $lengthnewdata=2.5*&LATEX_length($elementdata);
                   2662: 		    if ($lengthnewdata>$current_length) {$current_length=$lengthnewdata;}
                   2663:                     my @words=split(/ /,$elementdata);
                   2664: 		    foreach my $word (@words) {
                   2665: 			my $lengthword=2.5*&LATEX_length($word);
                   2666: 			if ($min_length<$lengthword) {$min_length=$lengthword;}
                   2667: 		    }
                   2668: 		}
                   2669: 	    } else {
                   2670: 		$current_length=2.5*&LATEX_length($data);
                   2671:                     my @words=split(/ /,$data);
                   2672: 		    foreach my $word (@words) {
                   2673: 			my $lengthword=2*&LATEX_length($word);
                   2674: 			if ($min_length<$lengthword) {$min_length=$lengthword;}
                   2675: 		    }
                   2676: 	    }
                   2677: 	    push @ {$Apache::londefdef::table[-1]{'TeXlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
                   2678: 	    push @ {$Apache::londefdef::table[-1]{'objectlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
                   2679: 	    push @ {$Apache::londefdef::table[-1]{'maxlen'}[$Apache::londefdef::table[-1]{'row_number'}] },$current_length;
                   2680: 	    push @ {$Apache::londefdef::table[-1]{'minlen'}[$Apache::londefdef::table[-1]{'row_number'}] },$min_length;
                   2681: 	}        
                   2682:     }
                   2683: 	for (my $in=0; $in<=$#{$Apache::londefdef::table[-1]{'include'}};$in++) {         
                   2684: 	    $data=~s/\\keephidden\{NEW TABLE ENTRY\}/$Apache::londefdef::table[-1]{'include'}[$in]/;
                   2685: 	}
                   2686:     #make data bold
                   2687:     $data='\textbf{'.$data.'}';
                   2688:     push @ {$Apache::londefdef::table[-1]{'content'}[-1] },$data;
                   2689:     return'';
                   2690: }
                   2691: 
1.122     albertel 2692: sub end_th {
1.130     sakharuk 2693:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.279     foxr     2694:     my $currentstring = &end_p();	# Close any open <p> in the row.
1.325     albertel 2695:     if ($target eq 'web' || $target eq 'webgrade') {
1.277     foxr     2696: 	$currentstring .= $token->[2];     
1.122     albertel 2697:     } elsif ($target eq 'tex') {
1.230     sakharuk 2698:         $Apache::londefdef::TD_redirection =0;
                   2699: 	&end_th_tex($parstack,$parser,$safeeval);
1.122     albertel 2700:     }
                   2701:     return $currentstring;
                   2702: }
1.230     sakharuk 2703:      
1.181     sakharuk 2704: #-- <img> tag (end tag forbidden)
1.249     foxr     2705: #
                   2706: #  Render the <IMG> tag.
                   2707: #     <IMG> has the following attributes (in addition to the 
                   2708: #     standard HTML ones:
                   2709: #      TeXwrap   - Governs how the tex target will try to wrap text around
                   2710: #                  horizontally aligned images.
                   2711: #      TeXwidth  - The width of the image when rendered for print (mm).
                   2712: #      TeXheight - The height of the image when rendered for print (mm)
                   2713: #         (Note there seems to also be support for this as a % of page size)
                   2714: #      
1.122     albertel 2715: sub start_img {
1.299     albertel 2716:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
1.122     albertel 2717:     my $src = &Apache::lonxml::get_param('src',$parstack,$safeeval,
                   2718: 					 undef,1);
1.325     albertel 2719:     if (! $src && 
                   2720: 	($target eq 'web' || $target eq 'webgrade' || $target eq 'tex')
                   2721: 	) { 
1.299     albertel 2722: 	my $inside = &Apache::lonxml::get_all_text("/img",$parser,$style);
1.189     albertel 2723: 	return '';
                   2724:     }
1.290     albertel 2725:     &Apache::lonxml::extlink($src);
1.122     albertel 2726:     my $currentstring = '';
                   2727:     my $scaling = .3;
1.249     foxr     2728: 
                   2729:    # Render unto browsers that which are the browser's...
                   2730: 
1.325     albertel 2731:     if ($target eq 'web' || $target eq 'webgrade') {
1.267     albertel 2732: 	if ($env{'browser.imagesuppress'} ne 'on') {
1.322     albertel 2733: 	    my $enc = ('yes' eq 
                   2734: 		       lc(&Apache::lonxml::get_param('encrypturl',$parstack,
                   2735: 						     $safeeval)));
                   2736: 	    $currentstring.=&Apache::lonenc::encrypt_ref($token,{'src'=>$src},
                   2737: 							 $enc);
1.122     albertel 2738: 	} else {
1.322     albertel 2739: 	    my $alttag = &Apache::lonxml::get_param('alt',$parstack,$safeeval,
                   2740: 						    undef,1);
                   2741: 	    if (!$alttag) {
                   2742: 		$alttag = &Apache::lonmeta::alttag($Apache::lonxml::pwd[-1],
                   2743: 						   $src);
1.51      sakharuk 2744: 	    }
1.158     sakharuk 2745: 	    $currentstring.='[IMAGE: '.$alttag.']';
1.1       sakharuk 2746: 	}
1.249     foxr     2747: 
                   2748: 	# and render unto TeX that which is LaTeX
                   2749: 
1.122     albertel 2750:     } elsif ($target eq 'tex') {
1.248     foxr     2751: 	#
                   2752: 	#  The alignment will require some superstructure to be put around
                   2753: 	#  the \includegraphics stuff.  At present we can only partially
                   2754: 	#  simulate the alignments offered by html.
                   2755: 	#
                   2756: 	#
                   2757: 	my $align = lc(&Apache::lonxml::get_param('align', 
                   2758: 						  $parstack,
                   2759: 						  $safeeval,
                   2760: 						  undef,1));
                   2761: 	if(!$align) {
1.287     foxr     2762: 		$align = "bottom";	# This is html's default so it's ours too.
1.248     foxr     2763: 	}
                   2764: 	#
                   2765: 	&Apache::lonxml::debug("Alignemnt = $align");
                   2766: 	#  LaTeX's image/text wrapping is really bad since it wants to
                   2767: 	#  make figures float.  
                   2768:         #   The user has the optional parameter (applicable only to l/r
                   2769: 	# alignment to use the picins/parpic directive to get wrapped text
                   2770: 	# this is also imperfect.. that's why we give them a choice...
                   2771: 	# so they can't yell at us for our choice.
                   2772: 	#
                   2773: 	my $latex_rendering = &Apache::lonxml::get_param('TeXwrap',
                   2774: 							    $parstack,
                   2775: 							    $safeeval,
                   2776: 							    undef,0);
1.312     foxr     2777: 	# &Apache::lonxml::debug("LaTeX rendering = $latex_rendering");
1.248     foxr     2778: 	if(!$latex_rendering) {
1.312     foxr     2779: 		$latex_rendering = "texwrap";
                   2780: 	}
                   2781: 	# using texwrap inside a table does not work. So, if after all of this,
                   2782: 	# texwrap is on, we turn it off if we detect we're in a table:
                   2783: 	#
                   2784: 	if (($latex_rendering eq 'texwrap') && &is_inside_of($tagstack, "table")) {
                   2785: 	    $latex_rendering = 'parpic';
1.248     foxr     2786: 	}
1.323     foxr     2787: 
1.312     foxr     2788: 	# &Apache::lonxml::debug("LaTeX rendering = $latex_rendering image file: $src");
1.248     foxr     2789: 
1.256     albertel 2790: 	#if original gif/jpg/png file exist do following:
1.266     albertel 2791: 	my $origsrc=$src;
1.256     albertel 2792: 	my ($path,$file) = &get_eps_image($src);
1.122     albertel 2793: 	$src=&Apache::lonnet::filelocation($Apache::lonxml::pwd[-1],$src);
1.261     foxr     2794: 	&Apache::lonxml::debug("path = $path file = $file src = $src");
1.192     sakharuk 2795: 	if (-e $src) {
1.261     foxr     2796: 	    &Apache::lonxml::debug("$src exists");
1.256     albertel 2797: 	    my ($height_param,$width_param)=
1.266     albertel 2798: 		&image_size($origsrc,0.3,$parstack,$safeeval);
1.262     foxr     2799: 	    my $destpath = $path;
1.263     foxr     2800: 	    $destpath    =~ s/ /\_/g; # Spaces in path cause LaTex to vomit.
                   2801: 	    my $destfile = $file;
                   2802: 	    $destfile    =~ s/ /\_/g;
1.266     albertel 2803: 	    my $size;
                   2804: 	    if ($width_param)  { $size.='width='.$width_param.' mm,'; }
                   2805: 	    if ($height_param) { $size.='height='.$height_param.' mm]'; }
                   2806: 	    $size='['.$size;
                   2807: 	    $size=~s/,$/]/; 
1.262     foxr     2808: 	    $currentstring .= '\graphicspath{{'.$destpath.'}}'
1.266     albertel 2809: 		.'\includegraphics'.$size.'{'.$destfile.'} ';
1.256     albertel 2810: 
1.248     foxr     2811: 	    #    If there's an alignment specification we need to honor it here.
                   2812: 	    #    For the horizontal alignments, we will also honor the
                   2813: 	    #    value of the latex specfication.  The default is parbox,
                   2814: 	    #    and that's used for illegal values too.  
                   2815: 	    #    
                   2816: 	    #    Even though we set a default alignment value, the user
                   2817: 	    #    could have given us an illegal value.  In that case we
                   2818: 	    #    just use the default alignment of bottom..
                   2819: 	    if      ($align eq "top")    {
                   2820: 		$currentstring = '\raisebox{-'.$height_param.'mm}{'.$currentstring.'}';
                   2821: 	    } elsif (($align eq "center") || ($align eq "middle")) { # Being kind
                   2822: 		my $offset = $height_param/2;
                   2823: 		$currentstring = '\raisebox{-'.$offset.'mm}{'.$currentstring.'}';
                   2824: 	    } elsif ($align eq "left")   { 
                   2825: 		if ($latex_rendering eq "parpic") { 
                   2826: 		    $currentstring = '\parpic[l]{'.$currentstring.'}';
1.286     foxr     2827: 		} else {    	                                 # wrapfig render
                   2828: 		    $currentstring = '\begin{wrapfigure}{l}{'.$width_param.'mm}'
                   2829: 			.'\scalebox{1.0}{'.$currentstring.'}\end{wrapfigure}';
1.248     foxr     2830: 		}
                   2831: 	    } elsif ($align eq "right")  {   
                   2832: 		if ($latex_rendering eq "parpic") {
                   2833: 		    $currentstring = '\parpic[r]{'.$currentstring.'}';
1.286     foxr     2834: 		} else {	                                 # wrapfig rendering
                   2835: 		    $currentstring = '\begin{wrapfigure}{r}{'.$width_param.'mm}'
                   2836: 			.'\scalebox{1.0}{'.$currentstring.'}\end{wrapfigure}';
                   2837: 
1.248     foxr     2838: 		}
                   2839: 	    } else {		# Bottom is also default.
                   2840: 		# $currentstring = '\raisebox{'.$height_param.'mm}{'.$currentstring.'}';
                   2841: 	    }
1.122     albertel 2842: 	} else {
1.261     foxr     2843: 	    &Apache::lonxml::debug("$src does not exist");
1.122     albertel 2844: 	    #original image file doesn't exist so check the alt attribute
                   2845: 	    my $alt = 
                   2846: 		&Apache::lonxml::get_param('alt',$parstack,$safeeval,undef,1);
                   2847: 	    unless ($alt) {
                   2848: 		$alt=&Apache::lonmeta::alttag($Apache::lonxml::pwd[-1],$src);
                   2849: 	    }
                   2850: 
1.256     albertel 2851: 	    if ($alt) { $currentstring .= ' '.$alt.' '; }
1.59      sakharuk 2852: 	}
1.249     foxr     2853: 
                   2854: 	# And here's where the semi-quote breaks down: allow the user
                   2855:         # to edit the beast as well by rendering the problem for edit:
1.186     albertel 2856:     } elsif ($target eq 'edit') {
                   2857: 	$currentstring .=&Apache::edit::tag_start($target,$token);
                   2858: 	$currentstring .=&Apache::edit::text_arg('Image Url:','src',$token,70).
                   2859: 	    &Apache::edit::browse('src',undef,'alt').' '.
                   2860: 	    &Apache::edit::search('src',undef,'alt').'<br />';
                   2861: 	$currentstring .=&Apache::edit::text_arg('Description:','alt',$token,70).'<br />';
                   2862: 	$currentstring .=&Apache::edit::text_arg('width (pixel):','width',$token,5);
                   2863: 	$currentstring .=&Apache::edit::text_arg('height (pixel):','height',$token,5).'<br />';
                   2864: 	$currentstring .=&Apache::edit::text_arg('TeXwidth (mm):','TeXwidth',$token,5);
                   2865: 	$currentstring .=&Apache::edit::text_arg('TeXheight (mm):','TeXheight',$token,5);
1.234     albertel 2866: 	$currentstring .=&Apache::edit::select_arg('Alignment:','align',
                   2867: 						   ['','bottom','middle','top','left','right'],$token,5);
1.249     foxr     2868: 	$currentstring .=&Apache::edit::select_arg('TeXwrap:', 'TeXwrap',
                   2869: 						   ['', 'parbox', 'parpic'], $token, 2);
1.322     albertel 2870: 	$currentstring .=&Apache::edit::select_arg('Encyrpt URL:','encrypturl',
                   2871: 						   ['no','yes'], $token, 2);
1.186     albertel 2872: 	$currentstring .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
1.249     foxr     2873: 	my $src=    &Apache::lonxml::get_param('src',$parstack,$safeeval);
                   2874: 	my $alt=    &Apache::lonxml::get_param('alt',$parstack,$safeeval);
                   2875: 	my $width=  &Apache::lonxml::get_param('width',$parstack,$safeeval);
                   2876: 	my $height= &Apache::lonxml::get_param('height',$parstack,$safeeval);
                   2877: 
                   2878: 
1.186     albertel 2879: 	$currentstring .= '<img src="'.$src.'" alt="'.$alt.'" ';
                   2880: 	if ($width) { $currentstring.=' width="'.$width.'" '; }
                   2881: 	if ($height) { $currentstring.=' height="'.$height.'" '; }
                   2882: 	$currentstring .= ' />';
                   2883:     } elsif ($target eq 'modified') {
1.210     albertel 2884: 	my ($osrc,$owidth,$oheight)=
                   2885: 	    ($token->[2]{'src'},$token->[2]{'width'},$token->[2]{'height'});
                   2886: 	my $ctag=&Apache::edit::get_new_args($token,$parstack,
1.234     albertel 2887: 					     $safeeval,'src','alt','align',
1.249     foxr     2888: 					     'TeXwidth','TeXheight', 'TeXwrap',
1.322     albertel 2889: 					     'width','height','encrypturl');
1.210     albertel 2890: 	my ($nsrc,$nwidth,$nheight)=
                   2891: 	    ($token->[2]{'src'},$token->[2]{'width'},$token->[2]{'height'});
                   2892: 	my $loc=&Apache::lonnet::filelocation($Apache::lonxml::pwd[-1],$nsrc);
                   2893: 	&image_replication($loc);
                   2894: 	my ($iwidth,$iheight);
                   2895: 	if (-e $loc) {
                   2896: 	    my $image = Image::Magick->new;
                   2897: 	    $image->Read($loc);
                   2898: 	    ($iwidth, $iheight) = ($image->Get('width'),
                   2899: 				   $image->Get('height'));
                   2900: 	}
                   2901: 	if ($osrc ne $nsrc || (!$nwidth && !$nheight)) {
                   2902: 	    # changed image or no size specified,
                   2903:             # if they didn't explicitly change the 
                   2904:             # width or height use the ones from the image
                   2905: 	    if ($iwidth && $iheight) {
                   2906: 		if ($owidth == $nwidth || (!$nwidth && !$nheight)) {
                   2907: 		    $token->[2]{'width'} = $iwidth;$ctag=1;
                   2908: 		}
                   2909: 		if ($oheight == $nheight || (!$nwidth && !$nheight)) {
                   2910: 		    $token->[2]{'height'}=$iheight;$ctag=1;
1.186     albertel 2911: 		}
                   2912: 	    }
                   2913: 	}
1.210     albertel 2914: 	my ($cwidth,$cheight)=($token->[2]{'width'},$token->[2]{'height'});
                   2915: 	# if we don't have a width or height
                   2916: 	if ($iwidth && $cwidth && !$cheight) {
                   2917: 	    $token->[2]{'height'}=int(($cwidth/$iwidth)*$iheight);$ctag=1;
                   2918: 	}
                   2919: 	if ($iheight && $cheight && !$cwidth) {
                   2920: 	    $token->[2]{'width'}=int(($cheight/$iheight)*$iwidth);$ctag=1;
                   2921: 	}
                   2922: 	if ($ctag) {$currentstring=&Apache::edit::rebuild_tag($token);}
1.122     albertel 2923:     }
1.261     foxr     2924: 
1.122     albertel 2925:     return $currentstring;
                   2926: }
                   2927: 
                   2928: sub end_img {
                   2929:     my ($target,$token) = @_;
                   2930:     my $currentstring = '';
1.325     albertel 2931:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 2932: 	$currentstring = $token->[2];
                   2933:     } elsif ($target eq 'tex') {
                   2934: 	$currentstring = '';
                   2935:     }
                   2936:     return $currentstring;
                   2937: }
                   2938: 
1.181     sakharuk 2939: #-- <applet> tag (end tag required)
1.122     albertel 2940: sub start_applet {
                   2941:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
                   2942:     
                   2943:     my $code=&Apache::lonxml::get_param('code',$parstack,$safeeval,undef,1);
1.290     albertel 2944:     &Apache::lonxml::extlink($code);
1.122     albertel 2945:     my $archive=&Apache::lonxml::get_param('archive',$parstack,$safeeval,
                   2946: 					   undef,1);
1.290     albertel 2947:     &Apache::lonxml::extlink($archive);
1.122     albertel 2948:     my $currentstring = '';
1.325     albertel 2949:     if ($target eq 'web' || $target eq 'webgrade') {
1.267     albertel 2950: 	if ($env{'browser.appletsuppress'} ne 'on') {
1.250     albertel 2951: 	    $currentstring = &Apache::lonenc::encrypt_ref($token,
                   2952: 							  {'code'=>$code,
                   2953: 							   'archive'=>$archive}
                   2954: 							  );
1.122     albertel 2955: 	} else {
                   2956: 	    my $alttag= &Apache::lonxml::get_param('alt',$parstack,
                   2957: 						   $safeeval,undef,1);
                   2958: 	    unless ($alttag) {
                   2959: 		$alttag=&Apache::lonmeta::alttag($Apache::lonxml::pwd[-1],
                   2960: 						 $code);
1.44      sakharuk 2961: 	    }
1.122     albertel 2962: 	    $currentstring='[APPLET: '.$alttag.']';
1.1       sakharuk 2963: 	}
1.122     albertel 2964:     } elsif ($target eq 'tex') {
1.177     albertel 2965: 	my $alttag= &Apache::lonxml::get_param('alt',$parstack,
                   2966: 					       $safeeval,undef,1);
                   2967: 	unless ($alttag) {
                   2968: 	    my $code=&Apache::lonxml::get_param('code',$parstack,$safeeval,
                   2969: 						undef,1);
                   2970: 	    $alttag=&Apache::lonmeta::alttag($Apache::lonxml::pwd[-1],
                   2971: 					     $code);
1.175     sakharuk 2972: 	}
1.177     albertel 2973: 	$currentstring.='\begin{center} \fbox{Java Applet: '.$alttag.
                   2974: 	    '.}\end{center}';
1.122     albertel 2975:     } 
                   2976:     return $currentstring;
                   2977: }
                   2978: 
                   2979: sub end_applet {
                   2980:     my ($target,$token) = @_;
                   2981:     my $currentstring = '';
1.325     albertel 2982:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 2983: 	$currentstring = $token->[2];
                   2984:     } elsif ($target eq 'tex') {
                   2985:     } 
                   2986:     return $currentstring;
                   2987: }
                   2988: 
1.181     sakharuk 2989: #-- <embed> tag (end tag optional/required)
1.122     albertel 2990: sub start_embed {    
                   2991:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
                   2992:     my $src=&Apache::lonxml::get_param('src',$parstack,$safeeval,undef,1);
1.290     albertel 2993:     &Apache::lonxml::extlink($src);
1.122     albertel 2994:     my $currentstring = '';
1.325     albertel 2995:     if ($target eq 'web' || $target eq 'webgrade') {
1.267     albertel 2996: 	if ($env{'browser.embedsuppress'} ne 'on') {
1.250     albertel 2997: 	    $currentstring=&Apache::lonenc::encrypt_ref($token,{'src'=>$src});
1.122     albertel 2998: 	} else {
                   2999: 	    my $alttag=&Apache::lonxml::get_param
                   3000: 		('alt',$parstack,$safeeval,undef,1);
                   3001: 	    unless ($alttag) {
                   3002: 		$alttag=&Apache::lonmeta::alttag($Apache::lonxml::pwd[-1],$src);
1.42      albertel 3003: 	    }
1.122     albertel 3004: 	    $currentstring='[EMBED: '.$alttag.']';
1.10      www      3005: 	}
1.122     albertel 3006:     } elsif ($target eq 'tex') {
                   3007:     } 
                   3008:     return $currentstring;
                   3009: }
                   3010: 
                   3011: sub end_embed {
                   3012:     my ($target,$token) = @_;
                   3013:     my $currentstring = '';
1.325     albertel 3014:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3015: 	$currentstring = $token->[2];     
1.175     sakharuk 3016:     } elsif ($target eq 'tex') {  
1.122     albertel 3017:     } 
                   3018:     return $currentstring;
                   3019: }
                   3020: 
1.181     sakharuk 3021: #-- <param> tag (end tag forbidden)
1.122     albertel 3022: sub start_param {
                   3023:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.290     albertel 3024:     if (&Apache::lonxml::get_param('name',$parstack,
                   3025: 				   $safeeval,undef,1)=~/^cabbase$/i) {
                   3026: 	my $value=&Apache::lonxml::get_param('value',$parstack,
                   3027: 					     $safeeval,undef,1);
                   3028: 	&Apache::lonxml::extlink($value);
                   3029:     } 
                   3030:   
                   3031:     my $src = &Apache::lonxml::get_param('src',$parstack,$safeeval,undef,1);
                   3032:     &Apache::lonxml::extlink($src);
1.122     albertel 3033:     my $currentstring = '';
1.325     albertel 3034:     if ($target eq 'web' || $target eq 'webgrade') {
1.250     albertel 3035: 	my %toconvert;
                   3036: 	my $src=&Apache::lonxml::get_param('src',$parstack,$safeeval,undef,1);
                   3037: 	if ($src) { $toconvert{'src'}= $src; }
                   3038: 	my $name=&Apache::lonxml::get_param('name',$parstack,$safeeval,
                   3039: 					    undef,1);
1.251     albertel 3040: 	if ($name=~/^cabbase$/i) {
                   3041: 	    $toconvert{'value'}=&Apache::lonxml::get_param('value',$parstack,
                   3042: 							   $safeeval,undef,1);
                   3043: 	}
1.250     albertel 3044: 	$currentstring = &Apache::lonenc::encrypt_ref($token,\%toconvert);
1.122     albertel 3045:     } elsif ($target eq 'tex') {
                   3046:     } 
                   3047:     return $currentstring;
                   3048: }
                   3049: 
                   3050: sub end_param {
                   3051:     my ($target,$token) = @_;
                   3052:     my $currentstring = '';
1.325     albertel 3053:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3054: 	$currentstring = $token->[2];     
                   3055:     } elsif ($target eq 'tex') {
                   3056:     } 
                   3057:     return $currentstring;
                   3058: }
                   3059: 
                   3060: #-- <allow> tag
                   3061: sub start_allow {
                   3062:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
                   3063:     my $src = &Apache::lonxml::get_param('src',$parstack,$safeeval,undef,1);
1.290     albertel 3064:     &Apache::lonxml::extlink($src);
                   3065: 
1.241     albertel 3066:     if ($target eq 'tex') { &image_replication($src); }
1.122     albertel 3067:     my $result;
                   3068:     if ($target eq 'edit') {
                   3069: 	$result .=&Apache::edit::tag_start($target,$token);
                   3070: 	$result .=&Apache::edit::text_arg('File Spec:','src',$token,70);
                   3071: 	$result .=&Apache::edit::end_row();#.&Apache::edit::start_spanning_row();
                   3072:     } elsif ($target eq 'modified') {
                   3073: 	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
                   3074: 						     $safeeval,'src');
                   3075: 	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
                   3076:     }
                   3077:     return $result;
                   3078: }
                   3079: 
                   3080: sub end_allow {
                   3081:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
                   3082:     if ( $target eq 'edit') { return (&Apache::edit::end_table()); }
                   3083:     return '';
                   3084: }
1.119     www      3085: 
1.181     sakharuk 3086: #-- Frames (end tag required)
                   3087: #-- <frameset>
1.122     albertel 3088: sub start_frameset {
                   3089:     my ($target,$token) = @_;
1.277     foxr     3090:     my $currentstring = '';	# Close any pending para.
1.325     albertel 3091:     if ($target eq 'web' || $target eq 'webgrade') { 
1.328     albertel 3092: 	$currentstring = 
                   3093: 	    &Apache::loncommon::start_page($Apache::londefdef::title,
                   3094: 					   $Apache::londefdef::head,
                   3095: 					   {'add_entries'    => $token->[2],
                   3096: 					    'no_title'       => 1,
                   3097: 					    'force_register' => 1,
                   3098: 					    'frameset'       => 1,});
                   3099: 
1.122     albertel 3100:     }
                   3101:     return $currentstring;
                   3102: }
                   3103: 
                   3104: sub end_frameset {
                   3105:     my ($target,$token) = @_;
                   3106:     my $currentstring = '';
1.325     albertel 3107:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3108: 	$currentstring = $token->[2];
                   3109:     }
                   3110:     return $currentstring;
                   3111: }
1.162     sakharuk 3112: 
1.181     sakharuk 3113: #-- <xmp> (end tag required)
1.162     sakharuk 3114: sub start_xmp {
                   3115:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
                   3116:     my $currentstring = '';
1.325     albertel 3117:     if ($target eq 'web' || $target eq 'webgrade') {
1.162     sakharuk 3118: 	$currentstring .= $token->[4];
                   3119:     } elsif ($target eq 'tex') {
                   3120: 	$currentstring .= '\begin{verbatim}';
                   3121:     } 
                   3122:     return $currentstring;
                   3123: }
                   3124: 
                   3125: sub end_xmp {
                   3126:     my ($target,$token) = @_;
                   3127:     my $currentstring = '';
1.325     albertel 3128:     if ($target eq 'web' || $target eq 'webgrade') {
1.162     sakharuk 3129: 	$currentstring .= $token->[2];
                   3130:     } elsif ($target eq 'tex') {
                   3131: 	$currentstring .= '\end{verbatim}';
                   3132:     }
                   3133:     return $currentstring;
                   3134: }
                   3135: 
1.181     sakharuk 3136: #-- <pre> (end tag required)
1.122     albertel 3137: sub start_pre {
1.126     sakharuk 3138:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.279     foxr     3139:     my $currentstring = &end_p();	# close off pending <p>
1.325     albertel 3140:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3141: 	$currentstring .= $token->[4];
                   3142:     } elsif ($target eq 'tex') {
1.136     sakharuk 3143: 	$currentstring .= '\begin{verbatim}';
1.319     albertel 3144: 	&Apache::lonxml::disable_LaTeX_substitutions();
1.122     albertel 3145:     } 
                   3146:     return $currentstring;
                   3147: }
                   3148: 
                   3149: sub end_pre {
                   3150:     my ($target,$token) = @_;
                   3151:     my $currentstring = '';
1.325     albertel 3152:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3153: 	$currentstring .= $token->[2];
                   3154:     } elsif ($target eq 'tex') {
1.136     sakharuk 3155: 	$currentstring .= '\end{verbatim}';
1.319     albertel 3156: 	&Apache::lonxml::enable_LaTeX_substitutions();
1.122     albertel 3157:     }
                   3158:     return $currentstring;
                   3159: }
                   3160: 
                   3161: #-- <insert>
                   3162: sub start_insert {
                   3163:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
                   3164:     my $currentstring = '';
1.325     albertel 3165:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3166: 	my $display = &Apache::lonxml::get_param('display',$parstack,$safeeval,undef,1);
                   3167: 	$currentstring .= '<b>'.$display.'</b>';;
                   3168:     }
                   3169:     return $currentstring;
                   3170: }
                   3171: 
                   3172: sub end_insert {
                   3173:     my ($target,$token) = @_;
                   3174:     my $currentstring = '';
1.325     albertel 3175:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3176: 	$currentstring .= '';
                   3177:     }
                   3178:     return $currentstring;
                   3179: }
                   3180: 
                   3181: #-- <externallink>
                   3182: sub start_externallink {
                   3183:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
                   3184:     my $currentstring = '';
1.325     albertel 3185:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3186: 	my $display = &Apache::lonxml::get_param('display',$parstack,$safeeval,undef,1);
                   3187: 	$currentstring .= '<b>'.$display.'</b>';;
                   3188:     }
                   3189:     return $currentstring;
                   3190: }
                   3191: 
                   3192: sub end_externallink {
                   3193:     my ($target,$token) = @_;
                   3194:     my $currentstring = '';
1.325     albertel 3195:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3196: 	$currentstring .= '';
                   3197:     }
                   3198:     return $currentstring;
                   3199: }
                   3200: 
                   3201: #-- <blankspace heigth="">
                   3202: sub start_blankspace {
                   3203:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.279     foxr     3204:     my $currentstring = &end_p();	# closes off any unclosed <p>
1.122     albertel 3205:     if ($target eq 'tex') {
                   3206: 	my $howmuch = &Apache::lonxml::get_param('heigth',$parstack,$safeeval,undef,1);
                   3207: 	$currentstring .= '\vskip '.$howmuch.' ';
                   3208:     }
                   3209:     return $currentstring;
                   3210: }
                   3211: 
                   3212: sub end_blankspace {
                   3213:     my ($target,$token) = @_;
                   3214:     my $currentstring = '';
                   3215:     if ($target eq 'tex') {
                   3216: 	$currentstring .= '';
                   3217:     }
                   3218:     return $currentstring;
                   3219: }
                   3220: 
1.181     sakharuk 3221: #-- <abbr> tag (end tag required)
1.122     albertel 3222: sub start_abbr {
                   3223:     my ($target,$token) = @_;
                   3224:     my $currentstring = '';
1.325     albertel 3225:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3226: 	$currentstring = $token->[4];     
                   3227:     } 
                   3228:     return $currentstring;
                   3229: }
                   3230: 
                   3231: sub end_abbr {
                   3232:     my ($target,$token) = @_;
                   3233:     my $currentstring = '';
1.325     albertel 3234:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3235: 	$currentstring = $token->[2];    
                   3236:     } 
                   3237:     return $currentstring;
                   3238: }
                   3239: 
1.181     sakharuk 3240: #-- <acronym> tag (end tag required)
1.122     albertel 3241: sub start_acronym {
                   3242:     my ($target,$token) = @_;
                   3243:     my $currentstring = '';
1.325     albertel 3244:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3245: 	$currentstring = $token->[4];     
                   3246:     } 
                   3247:     return $currentstring;
                   3248: }
                   3249: 
                   3250: sub end_acronym {
                   3251:     my ($target,$token) = @_;
                   3252:     my $currentstring = '';
1.325     albertel 3253:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3254: 	$currentstring = $token->[2];    
                   3255:     } 
                   3256:     return $currentstring;
                   3257: }
                   3258: 
1.181     sakharuk 3259: #-- <area> tag (end tag forbidden)
1.122     albertel 3260: sub start_area {
                   3261:     my ($target,$token) = @_;
                   3262:     my $currentstring = '';
1.325     albertel 3263:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3264: 	$currentstring = $token->[4];     
                   3265:     } 
                   3266:     return $currentstring;
                   3267: }
                   3268: 
                   3269: sub end_area {
                   3270:     my ($target,$token) = @_;
                   3271:     my $currentstring = '';
1.325     albertel 3272:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3273: 	$currentstring = $token->[2];    
                   3274:     } 
                   3275:     return $currentstring;
                   3276: }
                   3277: 
1.181     sakharuk 3278: #-- <base> tag (end tag forbidden)
1.122     albertel 3279: sub start_base {
                   3280:     my ($target,$token) = @_;
                   3281:     my $currentstring = '';
1.325     albertel 3282:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3283: 	$currentstring = $token->[4];     
1.161     sakharuk 3284:     }
1.122     albertel 3285:     return $currentstring;
                   3286: }
                   3287: 
                   3288: sub end_base {
                   3289:     my ($target,$token) = @_;
                   3290:     my $currentstring = '';
1.325     albertel 3291:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3292: 	$currentstring = $token->[2];    
                   3293:     } 
                   3294:     return $currentstring;
                   3295: }
                   3296: 
1.181     sakharuk 3297: #-- <bdo> tag (end tag required)
1.122     albertel 3298: sub start_bdo {
                   3299:     my ($target,$token) = @_;
                   3300:     my $currentstring = '';
1.325     albertel 3301:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3302: 	$currentstring = $token->[4];     
                   3303:     } 
                   3304:     return $currentstring;
                   3305: }
                   3306: 
                   3307: sub end_bdo {
                   3308:     my ($target,$token) = @_;
                   3309:     my $currentstring = '';
1.325     albertel 3310:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3311: 	$currentstring = $token->[2];    
                   3312:     } 
                   3313:     return $currentstring;
                   3314: }
                   3315: 
1.181     sakharuk 3316: #-- <bgsound> tag (end tag optional)
1.122     albertel 3317: sub start_bgsound {
                   3318:     my ($target,$token) = @_;
                   3319:     my $currentstring = '';
1.325     albertel 3320:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3321: 	$currentstring = $token->[4];     
                   3322:     } 
                   3323:     return $currentstring;
                   3324: }
                   3325: 
                   3326: sub end_bgsound {
                   3327:     my ($target,$token) = @_;
                   3328:     my $currentstring = '';
1.325     albertel 3329:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3330: 	$currentstring = $token->[2];    
                   3331:     } 
                   3332:     return $currentstring;
                   3333: }
                   3334: 
1.181     sakharuk 3335: #-- <blink> tag (end tag required)
1.122     albertel 3336: sub start_blink {
                   3337:     my ($target,$token) = @_;
                   3338:     my $currentstring = '';
1.325     albertel 3339:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3340: 	$currentstring = $token->[4];     
                   3341:     } 
                   3342:     return $currentstring;
                   3343: }
                   3344: 
                   3345: sub end_blink {
                   3346:     my ($target,$token) = @_;
                   3347:     my $currentstring = '';
1.325     albertel 3348:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3349: 	$currentstring = $token->[2];    
                   3350:     } 
                   3351:     return $currentstring;
                   3352: }
                   3353: 
1.181     sakharuk 3354: #-- <blockquote> tag (end tag required)
1.122     albertel 3355: sub start_blockquote {
                   3356:     my ($target,$token) = @_;
1.279     foxr     3357:     my $currentstring = &end_p();	# Close any unclosed <p>
1.325     albertel 3358:     if ($target eq 'web' || $target eq 'webgrade') {
1.277     foxr     3359: 	$currentstring .= $token->[4];     
1.122     albertel 3360:     } 
                   3361:     return $currentstring;
                   3362: }
                   3363: 
                   3364: sub end_blockquote {
                   3365:     my ($target,$token) = @_;
                   3366:     my $currentstring = '';
1.325     albertel 3367:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3368: 	$currentstring = $token->[2];    
                   3369:     } 
                   3370:     return $currentstring;
                   3371: }
                   3372: 
1.181     sakharuk 3373: #-- <button> tag (end tag required)
1.122     albertel 3374: sub start_button {
                   3375:     my ($target,$token) = @_;
                   3376:     my $currentstring = '';
1.325     albertel 3377:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3378: 	$currentstring = $token->[4];     
                   3379:     } 
                   3380:     return $currentstring;
                   3381: }
                   3382: 
                   3383: sub end_button {
                   3384:     my ($target,$token) = @_;
                   3385:     my $currentstring = '';
1.325     albertel 3386:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3387: 	$currentstring = $token->[2];    
                   3388:     } 
                   3389:     return $currentstring;
                   3390: }
                   3391: 
1.181     sakharuk 3392: #-- <caption> tag (end tag required)
1.122     albertel 3393: sub start_caption {
                   3394:     my ($target,$token) = @_;
                   3395:     my $currentstring = '';
1.325     albertel 3396:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3397: 	$currentstring = $token->[4];     
                   3398:     } 
                   3399:     return $currentstring;
                   3400: }
                   3401: 
                   3402: sub end_caption {
                   3403:     my ($target,$token) = @_;
                   3404:     my $currentstring = '';
1.325     albertel 3405:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3406: 	$currentstring = $token->[2];    
                   3407:     } 
                   3408:     return $currentstring;
                   3409: }
                   3410: 
1.181     sakharuk 3411: #-- <col> tag (end tag forbdden)
1.122     albertel 3412: sub start_col {
                   3413:     my ($target,$token) = @_;
                   3414:     my $currentstring = '';
1.325     albertel 3415:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3416: 	$currentstring = $token->[4];     
                   3417:     } 
                   3418:     return $currentstring;
                   3419: }
                   3420: 
                   3421: sub end_col {
                   3422:     my ($target,$token) = @_;
                   3423:     my $currentstring = '';
1.325     albertel 3424:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3425: 	$currentstring = $token->[2];    
                   3426:     } 
                   3427:     return $currentstring;
                   3428: }
                   3429: 
1.181     sakharuk 3430: #-- <colgroup> tag (end tag optional)
1.122     albertel 3431: sub start_colgroup {
                   3432:     my ($target,$token) = @_;
                   3433:     my $currentstring = '';
1.325     albertel 3434:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3435: 	$currentstring = $token->[4];     
                   3436:     } 
                   3437:     return $currentstring;
                   3438: }
                   3439: 
                   3440: sub end_colgroup {
                   3441:     my ($target,$token) = @_;
                   3442:     my $currentstring = '';
1.325     albertel 3443:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3444: 	$currentstring = $token->[2];    
                   3445:     } 
                   3446:     return $currentstring;
                   3447: }
                   3448: 
1.181     sakharuk 3449: #-- <del> tag (end tag required)
1.122     albertel 3450: sub start_del {
                   3451:     my ($target,$token) = @_;
                   3452:     my $currentstring = '';
1.325     albertel 3453:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3454: 	$currentstring = $token->[4];     
                   3455:     } 
                   3456:     return $currentstring;
                   3457: }
                   3458: 
                   3459: sub end_del {
                   3460:     my ($target,$token) = @_;
                   3461:     my $currentstring = '';
1.325     albertel 3462:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3463: 	$currentstring = $token->[2];    
                   3464:     } 
                   3465:     return $currentstring;
                   3466: }
                   3467: 
1.181     sakharuk 3468: #-- <fieldset> tag (end tag required)
1.122     albertel 3469: sub start_fieldset {
                   3470:     my ($target,$token) = @_;
                   3471:     my $currentstring = '';
1.325     albertel 3472:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3473: 	$currentstring = $token->[4];     
                   3474:     } 
                   3475:     return $currentstring;
                   3476: }
                   3477: 
                   3478: sub end_fieldset {
                   3479:     my ($target,$token) = @_;
                   3480:     my $currentstring = '';
1.325     albertel 3481:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3482: 	$currentstring = $token->[2];    
                   3483:     } 
                   3484:     return $currentstring;
                   3485: }
                   3486: 
1.181     sakharuk 3487: #-- <frame> tag (end tag forbidden)
1.122     albertel 3488: sub start_frame {
                   3489:     my ($target,$token) = @_;
                   3490:     my $currentstring = '';
1.325     albertel 3491:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3492: 	$currentstring = $token->[4];     
                   3493:     } 
                   3494:     return $currentstring;
                   3495: }
                   3496: 
                   3497: sub end_frame {
                   3498:     my ($target,$token) = @_;
                   3499:     my $currentstring = '';
1.325     albertel 3500:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3501: 	$currentstring = $token->[2];    
                   3502:     } 
                   3503:     return $currentstring;
                   3504: }
                   3505: 
1.181     sakharuk 3506: #-- <iframe> tag (end tag required)
1.122     albertel 3507: sub start_iframe {
                   3508:     my ($target,$token) = @_;
                   3509:     my $currentstring = '';
1.325     albertel 3510:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3511: 	$currentstring = $token->[4];     
                   3512:     } 
                   3513:     return $currentstring;
                   3514: }
                   3515: 
                   3516: sub end_iframe {
                   3517:     my ($target,$token) = @_;
                   3518:     my $currentstring = '';
1.325     albertel 3519:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3520: 	$currentstring = $token->[2];    
                   3521:     } 
                   3522:     return $currentstring;
                   3523: }
                   3524: 
1.181     sakharuk 3525: #-- <ins> tag (end tag required)
1.122     albertel 3526: sub start_ins {
                   3527:     my ($target,$token) = @_;
                   3528:     my $currentstring = '';
1.325     albertel 3529:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3530: 	$currentstring = $token->[4];     
                   3531:     } 
                   3532:     return $currentstring;
                   3533: }
                   3534: 
                   3535: sub end_ins {
                   3536:     my ($target,$token) = @_;
                   3537:     my $currentstring = '';
1.325     albertel 3538:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3539: 	$currentstring = $token->[2];    
                   3540:     } 
                   3541:     return $currentstring;
                   3542: }
                   3543: 
1.181     sakharuk 3544: #-- <isindex> tag (end tag forbidden)
1.122     albertel 3545: sub start_isindex {
                   3546:     my ($target,$token) = @_;
                   3547:     my $currentstring = '';
1.325     albertel 3548:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3549: 	$currentstring = $token->[4];     
                   3550:     } 
                   3551:     return $currentstring;
                   3552: }
                   3553: 
                   3554: sub end_isindex {
                   3555:     my ($target,$token) = @_;
                   3556:     my $currentstring = '';
1.325     albertel 3557:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3558: 	$currentstring = $token->[2];    
                   3559:     } 
                   3560:     return $currentstring;
                   3561: }
                   3562: 
1.181     sakharuk 3563: #-- <keygen> tag (end tag forbidden)
1.122     albertel 3564: sub start_keygen {
                   3565:     my ($target,$token) = @_;
                   3566:     my $currentstring = '';
1.325     albertel 3567:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3568: 	$currentstring = $token->[4];     
                   3569:     } 
                   3570:     return $currentstring;
                   3571: }
                   3572: 
                   3573: sub end_keygen {
                   3574:     my ($target,$token) = @_;
                   3575:     my $currentstring = '';
1.325     albertel 3576:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3577: 	$currentstring = $token->[2];    
                   3578:     } 
                   3579:     return $currentstring;
                   3580: }
                   3581: 
                   3582: #-- <label> tag
                   3583: sub start_label {
                   3584:     my ($target,$token) = @_;
                   3585:     my $currentstring = '';
1.325     albertel 3586:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3587: 	$currentstring = $token->[4];     
                   3588:     } 
                   3589:     return $currentstring;
                   3590: }
                   3591: 
                   3592: sub end_label {
                   3593:     my ($target,$token) = @_;
                   3594:     my $currentstring = '';
1.325     albertel 3595:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3596: 	$currentstring = $token->[2];    
                   3597:     } 
                   3598:     return $currentstring;
                   3599: }
                   3600: 
1.181     sakharuk 3601: #-- <layer> tag (end tag required)
1.122     albertel 3602: sub start_layer {
                   3603:     my ($target,$token) = @_;
                   3604:     my $currentstring = '';
1.325     albertel 3605:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3606: 	$currentstring = $token->[4];     
                   3607:     } 
                   3608:     return $currentstring;
                   3609: }
                   3610: 
                   3611: sub end_layer {
                   3612:     my ($target,$token) = @_;
                   3613:     my $currentstring = '';
1.325     albertel 3614:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3615: 	$currentstring = $token->[2];    
                   3616:     } 
                   3617:     return $currentstring;
                   3618: }
                   3619: 
1.181     sakharuk 3620: #-- <legend> tag (end tag required)
1.122     albertel 3621: sub start_legend {
                   3622:     my ($target,$token) = @_;
                   3623:     my $currentstring = '';
1.325     albertel 3624:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3625: 	$currentstring = $token->[4];     
                   3626:     } 
                   3627:     return $currentstring;
                   3628: }
                   3629: 
                   3630: sub end_legend {
                   3631:     my ($target,$token) = @_;
                   3632:     my $currentstring = '';
1.325     albertel 3633:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3634: 	$currentstring = $token->[2];    
                   3635:     } 
                   3636:     return $currentstring;
                   3637: }
                   3638: 
1.181     sakharuk 3639: #-- <link> tag (end tag forbidden)
1.122     albertel 3640: sub start_link {
1.292     albertel 3641:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
1.122     albertel 3642:     my $currentstring = '';
1.324     albertel 3643:     if ($target eq 'web' || $target eq 'webgrade') {
1.291     albertel 3644: 	my $href=&Apache::lonxml::get_param('href',$parstack,$safeeval,
                   3645: 					    undef,1);
                   3646: 	&Apache::lonxml::extlink($href);
1.122     albertel 3647: 	$currentstring = $token->[4];     
                   3648:     } 
                   3649:     return $currentstring;
                   3650: }
                   3651: 
                   3652: sub end_link {
                   3653:     my ($target,$token) = @_;
                   3654:     my $currentstring = '';
1.325     albertel 3655:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3656: 	$currentstring = $token->[2];    
                   3657:     } 
                   3658:     return $currentstring;
                   3659: }
                   3660: 
1.181     sakharuk 3661: #-- <marquee> tag (end tag optional)
1.122     albertel 3662: sub start_marquee {
                   3663:     my ($target,$token) = @_;
                   3664:     my $currentstring = '';
1.325     albertel 3665:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3666: 	$currentstring = $token->[4];     
                   3667:     } 
                   3668:     return $currentstring;
                   3669: }
                   3670: 
                   3671: sub end_marquee {
                   3672:     my ($target,$token) = @_;
                   3673:     my $currentstring = '';
1.325     albertel 3674:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3675: 	$currentstring = $token->[2];    
                   3676:     } 
                   3677:     return $currentstring;
                   3678: }
                   3679: 
1.179     sakharuk 3680: #-- <multicol> tag (end tag required)
                   3681: sub start_multicol {
1.122     albertel 3682:     my ($target,$token) = @_;
1.279     foxr     3683:     my $currentstring = &end_p();	# Close any pending <p>
1.325     albertel 3684:     if ($target eq 'web' || $target eq 'webgrade') {
1.277     foxr     3685: 	$currentstring .= $token->[4];     
1.122     albertel 3686:     } 
                   3687:     return $currentstring;
                   3688: }
                   3689: 
1.179     sakharuk 3690: sub end_multicol {
1.122     albertel 3691:     my ($target,$token) = @_;
                   3692:     my $currentstring = '';
1.325     albertel 3693:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3694: 	$currentstring = $token->[2];    
                   3695:     } 
                   3696:     return $currentstring;
                   3697: }
                   3698: 
1.179     sakharuk 3699: #-- <nobr> tag (end tag required)
1.122     albertel 3700: sub start_nobr {
                   3701:     my ($target,$token) = @_;
                   3702:     my $currentstring = '';
1.325     albertel 3703:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3704: 	$currentstring = $token->[4];     
1.179     sakharuk 3705:     }  elsif ($target eq 'tex') {
                   3706: 	$currentstring='\mbox{';
                   3707:     }
1.122     albertel 3708:     return $currentstring;
                   3709: }
                   3710: 
                   3711: sub end_nobr {
                   3712:     my ($target,$token) = @_;
                   3713:     my $currentstring = '';
1.325     albertel 3714:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3715: 	$currentstring = $token->[2];    
1.179     sakharuk 3716:     }   elsif ($target eq 'tex') {
                   3717: 	$currentstring='}';
                   3718:     }
1.122     albertel 3719:     return $currentstring;
                   3720: }
                   3721: 
1.179     sakharuk 3722: #-- <noembed> tag (end tag required)
1.122     albertel 3723: sub start_noembed {
                   3724:     my ($target,$token) = @_;
                   3725:     my $currentstring = '';
1.325     albertel 3726:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3727: 	$currentstring = $token->[4];     
                   3728:     } 
                   3729:     return $currentstring;
                   3730: }
                   3731: 
                   3732: sub end_noembed {
                   3733:     my ($target,$token) = @_;
                   3734:     my $currentstring = '';
1.325     albertel 3735:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3736: 	$currentstring = $token->[2];    
                   3737:     } 
                   3738:     return $currentstring;
                   3739: }
                   3740: 
1.179     sakharuk 3741: #-- <noframes> tag (end tag required)
1.122     albertel 3742: sub start_noframes {
                   3743:     my ($target,$token) = @_;
                   3744:     my $currentstring = '';
1.325     albertel 3745:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3746: 	$currentstring = $token->[4];     
                   3747:     } 
                   3748:     return $currentstring;
                   3749: }
                   3750: 
                   3751: sub end_noframes {
                   3752:     my ($target,$token) = @_;
                   3753:     my $currentstring = '';
1.325     albertel 3754:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3755: 	$currentstring = $token->[2];    
                   3756:     } 
                   3757:     return $currentstring;
                   3758: }
                   3759: 
1.179     sakharuk 3760: #-- <nolayer> tag (end tag required)
1.122     albertel 3761: sub start_nolayer {
                   3762:     my ($target,$token) = @_;
                   3763:     my $currentstring = '';
1.325     albertel 3764:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3765: 	$currentstring = $token->[4];     
                   3766:     } 
                   3767:     return $currentstring;
                   3768: }
                   3769: 
                   3770: sub end_nolayer {
                   3771:     my ($target,$token) = @_;
                   3772:     my $currentstring = '';
1.325     albertel 3773:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3774: 	$currentstring = $token->[2];    
                   3775:     } 
                   3776:     return $currentstring;
                   3777: }
                   3778: 
1.179     sakharuk 3779: #-- <noscript> tag (end tag required)
1.122     albertel 3780: sub start_noscript {
                   3781:     my ($target,$token) = @_;
                   3782:     my $currentstring = '';
1.325     albertel 3783:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3784: 	$currentstring = $token->[4];     
                   3785:     } 
                   3786:     return $currentstring;
                   3787: }
                   3788: 
                   3789: sub end_noscript {
                   3790:     my ($target,$token) = @_;
                   3791:     my $currentstring = '';
1.325     albertel 3792:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3793: 	$currentstring = $token->[2];    
                   3794:     } 
                   3795:     return $currentstring;
                   3796: }
                   3797: 
1.179     sakharuk 3798: #-- <object> tag (end tag required)
1.122     albertel 3799: sub start_object {
                   3800:     my ($target,$token) = @_;
                   3801:     my $currentstring = '';
1.325     albertel 3802:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3803: 	$currentstring = $token->[4];     
                   3804:     } 
                   3805:     return $currentstring;
                   3806: }
                   3807: 
                   3808: sub end_object {
                   3809:     my ($target,$token) = @_;
                   3810:     my $currentstring = '';
1.325     albertel 3811:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3812: 	$currentstring = $token->[2];    
                   3813:     } 
                   3814:     return $currentstring;
                   3815: }
                   3816: 
1.179     sakharuk 3817: #-- <optgroup> tag (end tag required)
1.122     albertel 3818: sub start_optgroup {
                   3819:     my ($target,$token) = @_;
                   3820:     my $currentstring = '';
1.325     albertel 3821:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3822: 	$currentstring = $token->[4];     
                   3823:     } 
                   3824:     return $currentstring;
                   3825: }
                   3826: 
                   3827: sub end_optgroup {
                   3828:     my ($target,$token) = @_;
                   3829:     my $currentstring = '';
1.325     albertel 3830:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3831: 	$currentstring = $token->[2];    
                   3832:     } 
                   3833:     return $currentstring;
                   3834: }
                   3835: 
1.179     sakharuk 3836: #-- <samp> tag (end tag required)
1.122     albertel 3837: sub start_samp {
                   3838:     my ($target,$token) = @_;
                   3839:     my $currentstring = '';
1.325     albertel 3840:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3841: 	$currentstring = $token->[4];     
1.179     sakharuk 3842:     } elsif ($target eq 'tex') {
                   3843: 	$currentstring='\texttt{';
                   3844:     }
1.122     albertel 3845:     return $currentstring;
                   3846: }
                   3847: 
                   3848: sub end_samp {
                   3849:     my ($target,$token) = @_;
                   3850:     my $currentstring = '';
1.325     albertel 3851:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3852: 	$currentstring = $token->[2];    
1.179     sakharuk 3853:     } elsif ($target eq 'tex') {
                   3854: 	$currentstring='}';
                   3855:     }
1.122     albertel 3856:     return $currentstring;
                   3857: }
                   3858: 
                   3859: #-- <server> tag
                   3860: sub start_server {
                   3861:     my ($target,$token) = @_;
                   3862:     my $currentstring = '';
1.325     albertel 3863:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3864: 	$currentstring = $token->[4];     
                   3865:     } 
                   3866:     return $currentstring;
                   3867: }
                   3868: 
                   3869: sub end_server {
                   3870:     my ($target,$token) = @_;
                   3871:     my $currentstring = '';
1.325     albertel 3872:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3873: 	$currentstring = $token->[2];    
                   3874:     } 
                   3875:     return $currentstring;
                   3876: }
                   3877: 
1.179     sakharuk 3878: #-- <spacer> tag (end tag forbidden)
1.122     albertel 3879: sub start_spacer {
                   3880:     my ($target,$token) = @_;
1.279     foxr     3881:     my $currentstring = &end_p();	# Close off any open <p> tag.
1.325     albertel 3882:     if ($target eq 'web' || $target eq 'webgrade') {
1.277     foxr     3883: 	$currentstring .= $token->[4];     
1.122     albertel 3884:     } 
                   3885:     return $currentstring;
                   3886: }
                   3887: 
                   3888: sub end_spacer {
                   3889:     my ($target,$token) = @_;
                   3890:     my $currentstring = '';
1.325     albertel 3891:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3892: 	$currentstring = $token->[2];    
                   3893:     } 
                   3894:     return $currentstring;
                   3895: }
                   3896: 
1.179     sakharuk 3897: #-- <span> tag (end tag required)
1.122     albertel 3898: sub start_span {
                   3899:     my ($target,$token) = @_;
                   3900:     my $currentstring = '';
1.325     albertel 3901:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3902: 	$currentstring = $token->[4];     
                   3903:     } 
                   3904:     return $currentstring;
                   3905: }
                   3906: 
                   3907: sub end_span {
                   3908:     my ($target,$token) = @_;
                   3909:     my $currentstring = '';
1.325     albertel 3910:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3911: 	$currentstring = $token->[2];    
                   3912:     } 
                   3913:     return $currentstring;
                   3914: }
                   3915: 
1.179     sakharuk 3916: #-- <tbody> tag (end tag optional)
1.122     albertel 3917: sub start_tbody {
                   3918:     my ($target,$token) = @_;
                   3919:     my $currentstring = '';
1.325     albertel 3920:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3921: 	$currentstring = $token->[4];     
                   3922:     } 
                   3923:     return $currentstring;
                   3924: }
                   3925: 
                   3926: sub end_tbody {
                   3927:     my ($target,$token) = @_;
                   3928:     my $currentstring = '';
1.325     albertel 3929:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3930: 	$currentstring = $token->[2];    
                   3931:     } 
                   3932:     return $currentstring;
                   3933: }
                   3934: 
1.166     sakharuk 3935: #-- <tfoot> tag (end tag optional)
1.122     albertel 3936: sub start_tfoot {
                   3937:     my ($target,$token) = @_;
                   3938:     my $currentstring = '';
1.325     albertel 3939:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3940: 	$currentstring = $token->[4];     
                   3941:     } 
                   3942:     return $currentstring;
                   3943: }
                   3944: 
                   3945: sub end_tfoot {
                   3946:     my ($target,$token) = @_;
                   3947:     my $currentstring = '';
1.325     albertel 3948:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3949: 	$currentstring = $token->[2];    
                   3950:     } 
                   3951:     return $currentstring;
                   3952: }
                   3953: 
1.166     sakharuk 3954: #-- <thead> tag (end tag optional)
1.122     albertel 3955: sub start_thead {
                   3956:     my ($target,$token) = @_;
                   3957:     my $currentstring = '';
1.325     albertel 3958:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3959: 	$currentstring = $token->[4];     
                   3960:     } 
                   3961:     return $currentstring;
                   3962: }
1.10      www      3963: 
1.122     albertel 3964: sub end_thead {
                   3965:     my ($target,$token) = @_;
                   3966:     my $currentstring = '';
1.325     albertel 3967:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3968: 	$currentstring = $token->[2];    
                   3969:     } 
                   3970:     return $currentstring;
                   3971: }
1.119     www      3972: 
1.122     albertel 3973: #-- <var> tag
                   3974: sub start_var {
1.44      sakharuk 3975:     my ($target,$token) = @_;
                   3976:     my $currentstring = '';
1.325     albertel 3977:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 3978: 	$currentstring = $token->[4];     
1.163     sakharuk 3979:     } elsif ($target eq 'tex') {
                   3980: 	$currentstring = '\textit{'; 
                   3981:     }
1.44      sakharuk 3982:     return $currentstring;
                   3983: }
1.10      www      3984: 
1.122     albertel 3985: sub end_var {
                   3986:     my ($target,$token) = @_;
1.44      sakharuk 3987:     my $currentstring = '';
1.325     albertel 3988:     if ($target eq 'web' || $target eq 'webgrade') {
1.163     sakharuk 3989: 	$currentstring = $token->[2];
                   3990:     } elsif ($target eq 'tex') {
                   3991: 	$currentstring = '}'; 
1.44      sakharuk 3992:     } 
                   3993:     return $currentstring;
                   3994: }
1.119     www      3995: 
1.163     sakharuk 3996: #-- <wbr> tag (end tag forbidden)
1.122     albertel 3997: sub start_wbr {
                   3998:     my ($target,$token) = @_;
                   3999:     my $currentstring = '';
1.325     albertel 4000:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 4001: 	$currentstring = $token->[4];     
                   4002:     } 
                   4003:     return $currentstring;
1.98      albertel 4004: }
                   4005: 
1.122     albertel 4006: sub end_wbr {
                   4007:     my ($target,$token) = @_;
                   4008:     my $currentstring = '';
1.325     albertel 4009:     if ($target eq 'web' || $target eq 'webgrade') {
1.122     albertel 4010: 	$currentstring = $token->[2];    
                   4011:     } 
                   4012:     return $currentstring;
1.98      albertel 4013: }
1.134     sakharuk 4014: 
                   4015: #-- <hideweboutput> tag
                   4016: sub start_hideweboutput {
                   4017:     my ($target,$token) = @_;
1.325     albertel 4018:     if ($target eq 'web' || $target eq 'webgrade') {
1.134     sakharuk 4019: 	&Apache::lonxml::startredirection();     
                   4020:     } 
                   4021:     return '';
                   4022: }
                   4023: 
                   4024: sub end_hideweboutput {
                   4025:     my ($target,$token) = @_;
                   4026:     my $currentstring = '';
1.325     albertel 4027:     if ($target eq 'web' || $target eq 'webgrade') {
1.134     sakharuk 4028: 	$currentstring = &Apache::lonxml::endredirection();    
                   4029:     } 
                   4030:     return '';
                   4031: }
                   4032: 
1.94      sakharuk 4033: 
                   4034: sub image_replication {
                   4035:     my $src = shift;
1.187     albertel 4036:     if (not -e $src) { &Apache::lonnet::repcopy($src); }
                   4037:     #replicates eps or ps 
                   4038:     my $epssrc = my $pssrc = $src;
                   4039:     $epssrc =~ s/\.(gif|jpg|jpeg|png)$/.eps/i;
                   4040:     $pssrc  =~ s/\.(gif|jpg|jpeg|png)$/.ps/i;
                   4041:     if (not -e $epssrc && not -e $pssrc) {
                   4042: 	my $result=&Apache::lonnet::repcopy($epssrc);
1.264     raeburn  4043: 	if ($result ne 'ok') { &Apache::lonnet::repcopy($pssrc); }
1.94      sakharuk 4044:     }
                   4045:     return '';
1.195     sakharuk 4046: }
1.275     foxr     4047: #
                   4048: #   Get correct sizing parameter for an image given
                   4049: #   it's initial ht. and wid.  This allows sizing of
                   4050: #   images that are generated on-the-fly (e.g. gnuplot)
                   4051: #   as well as serving as a utility for image_size.
                   4052: # 
                   4053: #  Parameter:
                   4054: #        height_param
                   4055: #        width_param    - Initial picture dimensions.
                   4056: #        scaling        - A scale factor.
                   4057: #        parstack,      - the current stack of tag attributes 
                   4058: #                         from the xml parser
                   4059: #        safeeval,      - pointer to the safespace
                   4060: #        depth,         - from what level in the stack to look for attributes
                   4061: #                         (assumes -1 if unspecified)
                   4062: #        cis            - look for attrubutes case insensitively
                   4063: #                         (assumes false)
                   4064: #
                   4065: # Returns:
                   4066: #   height, width   - new dimensions.
                   4067: #
                   4068: sub resize_image {
                   4069:     my ($height_param, $width_param, $scaling,
                   4070: 	$parstack, $safeeval, $depth, $cis) = @_;
                   4071: 
                   4072:     # First apply the scaling...
1.271     foxr     4073: 
1.275     foxr     4074:     $height_param = $height_param * $scaling;
                   4075:     $width_param  = $width_param  * $scaling;
1.261     foxr     4076: 
1.197     sakharuk 4077:     #do we have any specified LaTeX size of the picture?
1.261     foxr     4078:     my $toget='TeXwidth'; 
                   4079:     if ($cis) { 
                   4080: 	$toget=lc($toget); 
                   4081:     }
1.256     albertel 4082:     my $TeXwidth = &Apache::lonxml::get_param($toget,$parstack,
                   4083: 					      $safeeval,$depth,$cis);
                   4084:     $toget='TeXheight'; if ($cis) { $toget=lc($toget); }
                   4085:     my $TeXheight = &Apache::lonxml::get_param($toget,$parstack,
                   4086: 					       $safeeval,$depth,$cis);
1.197     sakharuk 4087:     #do we have any specified web size of the picture?
                   4088:     my $width = &Apache::lonxml::get_param('width',$parstack,$safeeval,
1.256     albertel 4089: 					   $depth,1);
                   4090:     if ($TeXwidth) { 
1.252     matthew  4091: 	my $old_width_param=$width_param;
1.197     sakharuk 4092: 	if ($TeXwidth=~/(\d+)\s*\%/) {
1.267     albertel 4093: 	    $width_param = $1*$env{'form.textwidth'}/100;
1.197     sakharuk 4094: 	} else { 
                   4095: 	    $width_param = $TeXwidth;
                   4096: 	}
1.266     albertel 4097: 	if ($TeXheight) {
                   4098: 	    $height_param = $TeXheight;
                   4099: 	} elsif ($old_width_param) {
                   4100: 	    $height_param=$TeXwidth/$old_width_param*$height_param;
                   4101: 	}
1.256     albertel 4102:     } elsif ($TeXheight) {
1.248     foxr     4103: 	$height_param = $TeXheight;
1.266     albertel 4104: 	if ($height_param) {
                   4105: 	    $width_param  = $TeXheight/$height_param*$width_param;
                   4106: 	}
1.256     albertel 4107:     } elsif ($width) {
1.252     matthew  4108: 	my $old_width_param=$width_param;
1.256     albertel 4109: 	$width_param = $width*$scaling;
1.266     albertel 4110: 	if ($old_width_param) {
                   4111: 	    $height_param=$width_param/$old_width_param*$height_param;
                   4112: 	}
1.252     matthew  4113:     }
1.267     albertel 4114:     if ($width_param > $env{'form.textwidth'}) {
1.252     matthew  4115:         my $old_width_param=$width_param;
1.267     albertel 4116: 	$width_param =0.95*$env{'form.textwidth'};
1.266     albertel 4117: 	if ($old_width_param) {
                   4118: 	    $height_param=$width_param/$old_width_param*$height_param;
                   4119: 	}
1.197     sakharuk 4120:     }
1.275     foxr     4121: 
                   4122:     return ($height_param, $width_param);
                   4123: }
                   4124: 
                   4125: sub image_size {
                   4126:     my ($src,$scaling,$parstack,$safeeval,$depth,$cis)=@_;
                   4127: 
                   4128:     #size of image from gif/jpg/jpeg/png 
                   4129:     my $ressrc=&Apache::lonnet::filelocation($Apache::lonxml::pwd[-1],$src);
                   4130:     if (-e $ressrc) {
                   4131: 	$src = $ressrc;
                   4132:     }
                   4133:     my $image = Image::Magick->new;
                   4134:     my $current_figure = $image->Read($src);
                   4135:     my $width_param = $image->Get('width');
                   4136:     my $height_param = $image->Get('height');
                   4137:     &Apache::lonxml::debug("Image magick says: $src :  Height = $height_param width = $width_param");
                   4138:     undef($image);
                   4139: 
                   4140:     ($height_param, $width_param) = &resize_image($height_param, $width_param,
                   4141: 						  $scaling, $parstack, $safeeval, 
                   4142: 						  $depth, $cis);
                   4143: 
1.248     foxr     4144:     return ($height_param, $width_param);
                   4145: }
                   4146: 
                   4147: sub image_width {
                   4148:     my ($height, $width) = &image_size(@_);
                   4149:     return $width;
                   4150: }
                   4151: #  Not yet 100% sure this is correct in all circumstances..
                   4152: #  due to my uncertainty about mods to image_size.
                   4153: #
                   4154: sub image_height {
                   4155:     my ($height, $width) = &image_size(@_);
                   4156:     return $height;
1.197     sakharuk 4157: }
                   4158: 
1.256     albertel 4159: sub get_eps_image {
                   4160:     my ($src)=@_;
1.261     foxr     4161:     my $orig_src=&Apache::lonnet::filelocation($Apache::lonxml::pwd[-1], $src);
1.285     foxr     4162: 
                   4163:     # In order to prevent the substitution of the alt text, we need to
                   4164:     # be sure the orig_src file is on system now so:
                   4165: 
                   4166:     if (! -e $orig_src) {
                   4167: 	&Apache::lonnet::repcopy($orig_src); # Failure is not completely fatal.
                   4168:     }
1.275     foxr     4169:     &Apache::lonxml::debug("get_eps_image: Original image: $orig_src");
1.282     foxr     4170:     my ($spath, $sname, $sext) = fileparse($src, qr/\.(gif|png|jpg|jpeg)/i);
1.256     albertel 4171:     $src=~s/\.(gif|png|jpg|jpeg)$/\.eps/i;
                   4172:     $src=&Apache::lonnet::filelocation($Apache::lonxml::pwd[-1],$src);
1.275     foxr     4173:     &Apache::lonxml::debug("Filelocation gives: $src");
1.256     albertel 4174:     if (! -e $src) {
1.261     foxr     4175: 	&Apache::lonxml::debug("$src does not exist");
1.264     raeburn  4176: 	if (&Apache::lonnet::repcopy($src) ne 'ok' ) {
1.261     foxr     4177: 	    &Apache::lonxml::debug("Repcopy of $src failed (1)");
1.256     albertel 4178: 	    #if replication failed try to find ps file
                   4179: 	    $src=~s/\.eps$/\.ps/;
1.261     foxr     4180: 	    &Apache::lonxml::debug("Now looking for $src");
1.270     foxr     4181: 	    #if no ps file try to replicate it.
                   4182: 	    my $didrepcopy = &Apache::lonnet::repcopy($src);
                   4183: 	    &Apache::lonxml::debug("repcopy of $src ... $didrepcopy");
                   4184: 	    if ( (not -e $src) ||
                   4185: 		($didrepcopy ne 'ok')) {
1.261     foxr     4186: 		&Apache::lonxml::debug("Failed to find or replicate $src");
                   4187: 
1.256     albertel 4188: 		#if replication failed try to produce eps file dynamically
                   4189: 		$src=~s/\.ps$/\.eps/;
                   4190: 		my $temp_file;
1.267     albertel 4191: 		open(FILE,">>/home/httpd/prtspool/$env{'user.name'}_$env{'user.domain'}_printout.dat");
1.256     albertel 4192: 		my $newsrc=$orig_src;
                   4193: 		$newsrc =~ s|(.*)/res/|/home/httpd/html/res/|;
1.275     foxr     4194: 		&Apache::lonxml::debug("queueing $newsrc for dynamic eps production.");
1.256     albertel 4195: 		print FILE "$newsrc\n";
1.261     foxr     4196: 		close FILE;
1.256     albertel 4197: 		$src=~s|/home/httpd/html/res|/home/httpd/prtspool|;
                   4198: 		$src=~s|/home/([^/]*)/public_html/|/home/httpd/prtspool/$1/|;
1.283     albertel 4199: 		if ($sext ne "") {	 # Put the ext. back in to uniquify.
                   4200: 		    $src =~ s/\.eps$/$sext.eps/;
                   4201: 		}
1.256     albertel 4202: 	    }
                   4203: 	}
                   4204:     }
                   4205:     my ($path,$file)=($src=~m|(.*)/([^/]*)$|);
1.261     foxr     4206:     &Apache::lonxml::debug("get_eps_image returning: $path / $file<BR />");
1.256     albertel 4207:     return ($path.'/',$file);
                   4208: }
                   4209: 
1.195     sakharuk 4210: sub eps_generation {
                   4211:     my ($src,$file,$width_param) = @_;	     
1.267     albertel 4212:     my $filename = "/home/httpd/prtspool/$env{'user.name'}_$env{'user.domain'}_printout.dat";
1.195     sakharuk 4213:     my $temp_file = Apache::File->new('>>'.$filename); 
                   4214:     print $temp_file "$src\n";
                   4215:     my $newsrc = $src;
                   4216:     $newsrc =~ s/(\.gif|\.jpg|\.jpeg)$/\.eps/i;
                   4217:     $newsrc=~s/\/home\/httpd\/html\/res//;
                   4218:     $newsrc=~s/\/home\/([^\/]*)\/public_html\//\/$1\//;
                   4219:     $newsrc=~s/\/\.\//\//;
                   4220:     $newsrc=~s/\/([^\/]+)\.(ps|eps)/\//;
1.213     sakharuk 4221:     if ($newsrc=~/\/home\/httpd\/lonUsers\//) {
                   4222: 	$newsrc=~s/\/home\/httpd\/lonUsers//;
                   4223: 	$newsrc=~s/\/([^\/]+)\/(\w)\/(\w)\/(\w)\//\/$1\//;
                   4224:     }
1.239     sakharuk 4225:     if ($newsrc=~/\/userfiles\//) {
                   4226: 	return ' \graphicspath{{'.$newsrc.'}}\includegraphics[width='.$width_param.' mm]{'.$file.'} ';
                   4227:     } else {
                   4228: 	return ' \graphicspath{{/home/httpd/prtspool'.$newsrc.'}}\includegraphics[width='.$width_param.' mm]{'.$file.'} ';
                   4229:     }
1.197     sakharuk 4230: }
                   4231: 
                   4232: sub file_path {     
                   4233:     my $src=shift;
                   4234:     my ($file,$path); 
                   4235:     if ($src =~ m!(.*)/([^/]*)$!) {
                   4236: 	$file = $2; 
                   4237: 	$path = $1.'/'; 
                   4238:     } 
                   4239:     return $file,$path;
1.126     sakharuk 4240: }
1.294     foxr     4241: #  Converts a measurement in to mm from any of 
                   4242: #  the other valid LaTeX units of measure.
                   4243: #  If the units of measure are missing from the 
                   4244: #  parameter, it is assumed to be in and returned
                   4245: #  with mm units of measure
1.126     sakharuk 4246: sub recalc {
                   4247:     my $argument = shift;
                   4248:     if (not $argument=~/(mm|cm|in|pc|pt)/) {return $argument.' mm';}
1.132     sakharuk 4249:     $argument=~/\s*(\d+\.?\d*)\s*(mm|cm|in|pc|pt)/;
1.126     sakharuk 4250:     my $value=$1;
                   4251:     my $units=$2;
                   4252:     if ($units eq 'cm') {
                   4253: 	$value*=10;
                   4254:     } elsif ($units eq 'in') {
                   4255: 	$value*=25.4;
                   4256:     } elsif ($units eq 'pc') {
                   4257: 	$value*=(25.4*12/72.27);
                   4258:     } elsif ($units eq 'pt') {
                   4259: 	$value*=(25.4/72.27);
                   4260:     }
                   4261:     return $value.' mm';
1.94      sakharuk 4262: }
1.184     sakharuk 4263: 
                   4264: sub LATEX_length {
                   4265:     my $garbage=shift;
1.206     sakharuk 4266:     $garbage=~s/^\s+$//;
                   4267:     $garbage=~s/^\s+(\S.*)/$1/;#space before 
                   4268:     $garbage=~s/(.*\S)\s+$/$1/;#space after 
                   4269:     $garbage=~s/(\s)+/$1/;#only one space
                   4270:     $garbage=~s/(\\begin{([^\}]+)}|\\end{([^\}]+)})//g;#remove LaTeX \begin{...} and \end{...}
                   4271:     $garbage=~s/(\$\_\{|\$\_|\$\^{|\$\^|\}\$)//g;#remove $_{,$_,$^{,$^,}$
                   4272:     $garbage=~s/([^\\])\$/$1/g;#$
                   4273:     $garbage=~s/(\\ensuremath\{\_\{|\\ensuremath\{\_|\\ensuremath\{\^{|\\ensuremath\{\^|\})//g;#remove \ensuremath{...}
                   4274:    $garbage=~s/(\\alpha|\\beta|\\gamma|\\delta|\\epsilon|\\verepsilon|\\zeta|\\eta|\\theta|\\vartheta|\\iota|\\kappa|\\lambda|\\mu|\\nu|\\xi|\\pi|\\varpi|\\rho|\\varrho|\\sigma|\\varsigma|\\tau|\\upsilon|\\phi|\\varphi|\\chi|\\psi|\\omega|\\Gamma|\\Delta|\\Theta|\\Lambda|\\Xi|\\Pi|\\Sigma|\\Upsilon|\\Phi|\\Psi|\\Omega)/1/g;
1.184     sakharuk 4275:     $garbage=~s/(\\pm|\\mp|\\times|\\div|\\cdot|\\ast|\\star|\\dagger|\\ddagger|\\amalg|\\cap|\\cup|\\uplus|\\sqcap|\\sqcup|\\vee|\\wedge|\\oplus|\\ominus|\\otimes|\\circ|\\bullet|\\diamond|\\lhd|\\rhd|\\unlhd|\\unrhd|\\oslash|\\odot|\\bigcirc|\\Box|\\Diamond|\\bigtriangleup|\\bigtriangledown|\\triangleleft|\\triangleright|\\setminus|\\wr)/1/g;
                   4276:     $garbage=~s/(\\le|\\ll|\\leq|\\ge|\\geq|\\gg|\\neq|\\doreq|\\sim|\\simeq|\\subset|\\subseteq|\\sqsubset|\\sqsubseteq|\\in|\\vdash|\\models|\\supset|\\supseteq|\\sqsupset|\\sqsupseteq|\\ni|\\dash|\\perp|\\approx|\\cong|\\equiv|\\propto|\\prec|\\preceq|\\parallel|\\asymp|\\smile|\\frown|\\bowtie|\\succ|\\succeq|\\mid)/1/g;
                   4277:     $garbage=~s/(\\not<|\\\\not\\le|\\not\\prec|\\not\\preceq|\\not\\subset|\\not\\subseteq|\\not\\sqsubseteq|\\not\\in|\\not>|\\not\\ge|\\not\\succ|\\notsucceq|\\not\\supset|\\notsupseteq|\\not\\sqsupseteq|\\notin|\\not=|\\not\\equiv|\\not\\sim|\\not\\simeq|\\not\\approx|\\not\\cong|\\not\\asymp)/1/g;
1.206     sakharuk 4278:     $garbage=~s/(\\leftarrow|\\gets|\\Leftarrow|\\rightarrow|\\to|\\Rightarrow|\\leftrightarrow|\\Leftrightarrow|\\mapsto|\\hookleftarrow|\\leftharpoonup|\\leftkarpoondown|\\rightleftharpoons|\\longleftarrow|\\Longleftarrow|\\longrightarrow|\\Longrightarrow|\\longleftrightarrow|\\Longleftrightarrow|\\longmapsto|\\hookrightarrow|\\rightharpoonup|\\rightharpoondown|\\uparrow|\\Uparrow|\\downarrow|\\Downarrow|\\updownarrow|\\Updownarrow|\\nearrow|\\searrow|\\swarrow|\\nwarrow)/11/g;
                   4279:     $garbage=~s/(\\aleph|\\hbar|\\imath|\\jmath|\\ell|\\wp|\\Re|\\Im|\\mho|\\prime|\\emptyset|\\nabla|\\surd|\\partial|\\top|\\bot|\\vdash|\\dashv|\\forall|\\exists|\\neg|\\flat|\\natural|\\sharp|\\\||\\angle|\\backslash|\\Box|\\Diamond|\\triangle|\\clubsuit|\\diamondsuit|\\heartsuit|\\spadesuit|\\Join|\\infty)/11/g;
                   4280:     $garbage=~s/(\\hat{([^}]+)}|\\check{([^}]+)}|\\dot{([^}]+)}|\\breve{([^}]+)}|\\acute{([^}]+)}|\\ddot{([^}]+)}|\\grave{([^}]+)}|\\tilde{([^}]+)}|\\mathring{([^}]+)}|\\bar{([^}]+)}|\\vec{([^}]+)})/$1/g;
                   4281:     #remove some other LaTeX command
                   4282:     $garbage=~s|\\(\w+)\\|\\|g;	 
                   4283:     $garbage=~s|\\(\w+)(\s*)|$2|g;	 	 
                   4284:     $garbage=~s|\+|11|g;
1.184     sakharuk 4285:     my  $value=length($garbage);
                   4286:     return $value;
                   4287: }
                   4288: 
                   4289: 
1.287     foxr     4290: # is_inside_of $tagstack $tag
                   4291: #    This sub returns true if the current state of Xml processing
                   4292: #    is inside of the tag.   
                   4293: # Parameters:
                   4294: #     tagstack   - The tagstack from the parser.
                   4295: #     tag        - The tag (without the <>'s.).
                   4296: # Sample usage:
                   4297: #     if (is_inside_of($tagstack "table")) {
                   4298: #          # I'm in a table....
                   4299: #      }
                   4300: sub is_inside_of {
                   4301:     my ($tagstack, $tag) = @_;
                   4302:     my @stack = @$tagstack;
                   4303:     for (my $i = ($#stack - 1); $i >= 0; $i--) {
                   4304: 	if ($stack[$i] eq $tag) {
                   4305: 	    return 1;
                   4306: 	}
                   4307:     }
                   4308:     return 0;
                   4309: }
1.184     sakharuk 4310: 
1.94      sakharuk 4311: 
1.1       sakharuk 4312: 1;
                   4313: __END__

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