Annotation of loncom/homework/structuretags.pm, revision 1.201

1.34      albertel    1: # The LearningOnline Network with CAPA 
                      2: # definition of tags that give a structure to a document
1.74      albertel    3: #
1.201   ! albertel    4: # $Id: structuretags.pm,v 1.200 2003/08/04 22:40:03 albertel Exp $
1.74      albertel    5: #
                      6: # Copyright Michigan State University Board of Trustees
                      7: #
                      8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
                      9: #
                     10: # LON-CAPA is free software; you can redistribute it and/or modify
                     11: # it under the terms of the GNU General Public License as published by
                     12: # the Free Software Foundation; either version 2 of the License, or
                     13: # (at your option) any later version.
                     14: #
                     15: # LON-CAPA is distributed in the hope that it will be useful,
                     16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
                     17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     18: # GNU General Public License for more details.
                     19: #
                     20: # You should have received a copy of the GNU General Public License
                     21: # along with LON-CAPA; if not, write to the Free Software
                     22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
                     23: #
                     24: # /home/httpd/html/adm/gpl.txt
                     25: #
                     26: # http://www.lon-capa.org/
                     27: #
1.33      albertel   28: # 2/19 Guy
1.44      ng         29: # 6/26/2001 fixed extra web display at end of <web></web> tags
1.60      www        30: # 8/17,8/18,8/20 Gerd Kortemeyer
1.54      www        31: 
1.133     sakharuk   32: 
1.1       albertel   33: package Apache::structuretags; 
                     34: 
                     35: use strict;
                     36: use Apache::lonnet;
1.101     sakharuk   37: use Apache::File();
1.147     www        38: use Apache::lonmenu;
1.1       albertel   39: 
1.78      harris41   40: BEGIN {
1.193     www        41:     &Apache::lonxml::register('Apache::structuretags',('block','languageblock','instructorcomment','while','randomlist','problem','library','web','tex','part','preduedate','postanswerdate','solved','notsolved','startouttext','endouttext',
1.197     www        42: 'simpleeditbutton','definetag'));
1.10      albertel   43: }
                     44: 
                     45: sub start_web {
1.159     albertel   46:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.200     albertel   47:     my $bodytext=&Apache::lonxml::get_all_text("/web",$parser);
                     48:     if ($target eq 'web') {
                     49: 	return $bodytext;
1.159     albertel   50:     }
                     51:     return '';
1.10      albertel   52: }
                     53: 
                     54: sub end_web {
1.44      ng         55:     return '';
1.10      albertel   56: }
                     57: 
                     58: sub start_tex {
1.159     albertel   59:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.198     sakharuk   60:     my $result='';
1.200     albertel   61:     my $bodytext=&Apache::lonxml::get_all_text("/tex",$parser);
                     62:     if ($target eq 'tex') {
                     63: 	return $bodytext.' ';
1.159     albertel   64:     }
1.198     sakharuk   65:     return $result;;
1.10      albertel   66: }
                     67: 
                     68: sub end_tex {
1.44      ng         69:     return '';
1.9       albertel   70: }
                     71: 
1.48      albertel   72: sub page_start {
1.159     albertel   73:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                     74:     my %found;
                     75:     foreach my $taginside ($tagstack) {
                     76: 	foreach my $taglookedfor ('html','body','form') {
                     77: 	    if ($taginside =~ /^$taglookedfor$/i) {$found{$taglookedfor} = 1;}
                     78: 	}
                     79:     }
                     80: 
                     81:     my $result;
                     82:     my $head_tag_start;
                     83:     if (!defined($found{'html'})) {
                     84: 	$result=&Apache::londefdef::start_html($target,$token,$tagstack,
                     85: 					       $parstack,$parser,$safeeval);
                     86: 	$head_tag_start='<head>'.&Apache::lonmenu::registerurl(undef,$target);
                     87:     }
                     88:     my $body_tag_start;
                     89:     if (!defined($found{'body'})) {
                     90: 	$body_tag_start='<body onLoad="'.&Apache::lonmenu::loadevents().'" '.
                     91: 	    'onUnload="'.&Apache::lonmenu::unloadevents().'" ';
                     92: 	my $background=&Apache::lonxml::get_param('background',$parstack,
                     93: 						  $safeeval);
1.199     www        94: 	if ($ENV{'browser.imagesuppress'} eq 'on') { $background=''; }
1.159     albertel   95: 	if ($background) {
                     96: 	    $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=
                     97: 		$background;
                     98: 	    $body_tag_start.='background="'.$background.'" ';
                     99: 	} else {
                    100: 	    my $bgcolor=&Apache::lonxml::get_param('bgcolor',$parstack,
                    101: 						   $safeeval);
1.199     www       102: 	    if (($bgcolor) && ($ENV{'browser.blackwhite'} ne 'on')) {
1.159     albertel  103: 		$body_tag_start.='bgcolor="'.$bgcolor.'" ';
                    104: 	    } else {
                    105: 		$body_tag_start.='bgcolor="#ffffff"';
                    106: 	    }
1.199     www       107: 	}
                    108: 	if ($ENV{'browser.fontenhance'} eq 'on') {
                    109: 	    $body_tag_start.=' style="font-size: x-large;" ';
1.159     albertel  110: 	}
                    111: 	$body_tag_start.='>'.&Apache::lonmenu::menubuttons(undef,$target,1);
                    112: 	if ($target eq 'web' && $ENV{'request.state'} ne 'construct') {
1.165     albertel  113: 	    my ($symb,undef,undef,undef,$publicuser)=
                    114: 		&Apache::lonxml::whichuser();
                    115: 	    if ($symb eq '' && !$publicuser) {
1.159     albertel  116: 		my $help = &Apache::loncommon::help_open_topic("Ambiguous_Reference");
1.162     albertel  117: 		$help="Browsing resource, all submissions are temporary.<br />";
1.159     albertel  118: 		$body_tag_start.=$help;
                    119: 	    }
                    120: 	}
                    121:     }
                    122:     my $form_tag_start;
                    123:     if (!defined($found{'form'})) {
                    124: 	$form_tag_start='<form name="lonhomework" method="POST" action="'.
                    125: 	    $ENV{'request.uri'}.'">';
                    126:     }
                    127:     return ($result,$head_tag_start,$body_tag_start,$form_tag_start);
1.105     albertel  128: }
                    129: 
1.141     matthew   130: #use Time::HiRes();
1.105     albertel  131: sub get_resource_name {
1.159     albertel  132:     my ($parstack,$safeeval)=@_;
                    133:     my $name=&Apache::lonnet::gettitle();
                    134:     if ($name eq '') {
                    135: 	$name=&Apache::lonnet::EXT('resource.title');
                    136: 	if ($name eq 'con_lost') { $name = ''; }
                    137:     }
                    138:     $Apache::lonhomework::name=$name;
                    139:     return $name;
1.105     albertel  140: }
                    141: 
                    142: sub setup_rndseed {
1.159     albertel  143:     my ($safeeval)=@_;
                    144:     my $rndseed;
1.162     albertel  145:     my ($symb)=&Apache::lonxml::whichuser();
                    146:     if ($ENV{'request.state'} eq "construct" || $symb eq '') {
1.159     albertel  147: 	$rndseed=$ENV{'form.rndseed'};
                    148: 	if (!$rndseed) {
1.162     albertel  149: 	    $rndseed=$Apache::lonhomework::history{'rndseed'};
                    150: 	    if (!$rndseed) {
                    151: 		$rndseed=time;
                    152: 		$ENV{'form.rndseed'}=$rndseed;
                    153: 	    }
                    154: 	}
1.175     albertel  155: 	if ($ENV{'form.resetdata'} eq 'New Problem Variation' ||
                    156: 	    $ENV{'form.newrandomization'} eq 'New Randomization') {
1.190     albertel  157: 	    srand(time);
                    158: 	    $rndseed=int(rand(2100000000));
1.159     albertel  159: 	    $ENV{'form.rndseed'}=$rndseed;
1.180     albertel  160: 	    delete($ENV{'form.resetdata'});
                    161: 	    delete($ENV{'form.newrandomization'});
1.159     albertel  162: 	}
1.187     albertel  163: 	if (defined($rndseed) && $rndseed ne int($rndseed)) {
                    164: 	   $rndseed=join(',',&Math::Random::random_seed_from_phrase($rndseed));
                    165:         }
1.159     albertel  166: 	&Apache::lonxml::debug("Setting rndseed to $rndseed");
                    167: 	&Apache::run::run('$external::randomseed='.$rndseed.';',$safeeval);
                    168:     }
                    169:     return $rndseed;
1.105     albertel  170: }
                    171: 
                    172: sub problem_edit_header {
1.159     albertel  173:     return '<input type="hidden" name="submitted" value="edit" />
1.105     albertel  174:        <input type="hidden" name="problemmode" value="Edit" />
                    175:        <input type="submit" name="problemmode" value="Discard Edits and View" />
                    176:        <input type="submit" name="problemmode" value="EditXML" />
                    177:        <input type="submit" name="Undo" value="undo" /> <hr />
1.135     www       178:        <input type="submit" name="submit" value="Submit Changes and Edit" />
                    179:        <input type="submit" name="submit" value="Submit Changes and View" /><br /><p>&nbsp;</p><table border="0"><tr><td bgcolor="#DDDDDD">
1.105     albertel  180:       ';
                    181: }
                    182: 
                    183: sub problem_edit_footer {
1.159     albertel  184:     return '</td></tr></table><br /><input type="submit" name="submit" value="Submit Changes and Edit" />
1.105     albertel  185:     <input type="submit" name="submit" value="Submit Changes and View" />';
                    186: }
                    187: 
                    188: sub problem_web_to_edit_header {
1.159     albertel  189:     my ($rndseed)=@_;
                    190:     my $result.='<input type="hidden" name="problemmode" value="View" />
1.105     albertel  191:              <input type="submit" name="problemmode" value="Edit" />
                    192:              <input type="submit" name="problemmode" value="EditXML" />
1.175     albertel  193:              <input type="submit" name="newrandomization" value="New Randomization" />
1.105     albertel  194:              <input type="submit" name="resetdata" value="Reset Submissions" />
1.175     albertel  195:              <nobr><input type="submit" name="changerandseed" value="Change Random Seed To:" />
                    196:               <input type="text" name="rndseed" width="10" value="'.
                    197: 	       $rndseed.'"
                    198:            onChange="javascript:document.lonhomework.changerandseed.click()" /></nobr>
1.105     albertel  199:              <input type="checkbox" name="showallfoils" ';
1.159     albertel  200:     if (defined($ENV{'form.showallfoils'})) { $result.='checked="on"'; }
                    201:     $result.= ' />&nbsp;Show&nbsp;All&nbsp;Foils
1.105     albertel  202:              <hr />';
1.159     albertel  203:     my $numtoanalyze=$ENV{'form.numtoanalyze'};
1.176     albertel  204:     if (!$numtoanalyze) { $numtoanalyze=20; }
                    205:     $result.= '<input type="submit" name="problemmode" value="Calculate answers" /> for
1.136     albertel  206:              <input type="text" name="numtoanalyze" value="'.
1.176     albertel  207: 		 $numtoanalyze.'" size="5" /> versions of this problem.'.
                    208: 		     &Apache::loncommon::help_open_topic("Analyze_Problem",
                    209: 						     '',undef,undef,300).
                    210: 		     '<hr />';
1.159     albertel  211:     return $result;
1.48      albertel  212: }
                    213: 
1.65      albertel  214: sub initialize_storage {
1.159     albertel  215:     %Apache::lonhomework::results=();
1.162     albertel  216:     %Apache::lonhomework::history=();
1.159     albertel  217:     my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
1.162     albertel  218:     if ($ENV{'request.state'} eq 'construct' || $symb eq '') {
1.159     albertel  219: 	%Apache::lonhomework::history=
                    220: 	    &Apache::lonnet::tmprestore($ENV{'request.uri'},'',$domain,$name);
                    221: 	my ($temp)=keys %Apache::lonhomework::history ;
                    222: 	&Apache::lonxml::debug("Return message of $temp");
                    223:     } else {
                    224: 	%Apache::lonhomework::history=
                    225: 	    &Apache::lonnet::restore($symb,$courseid,$domain,$name);
                    226:     }
                    227:     #ignore error conditions
1.67      albertel  228:     my ($temp)=keys %Apache::lonhomework::history ;
1.159     albertel  229:     if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }
1.65      albertel  230: }
                    231: 
                    232: # -------------------------------------------------------------finalize_storage
                    233: # Stores away the result has to a student's environment
                    234: # checks form.grade_ for specific values, other wises stores
                    235: # to the running users environment
                    236: sub finalize_storage {
1.159     albertel  237:     my $result;
                    238:     my ($temp) = keys %Apache::lonhomework::results;
                    239:     if ( $temp ne '' ) {
                    240: 	my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
1.162     albertel  241: 	if ($ENV{'request.state'} eq 'construct' || $symb eq '') {
                    242: 	    $Apache::lonhomework::results{'rndseed'}=$ENV{'form.rndseed'};
1.159     albertel  243: 	    $result=&Apache::lonnet::tmpstore(\%Apache::lonhomework::results,
                    244: 					$ENV{'request.uri'},'',$domain,$name);
                    245: 	    &Apache::lonxml::debug('Construct Store return message:'.$result);
                    246: 	} else {
                    247: 	    $result=&Apache::lonnet::cstore(\%Apache::lonhomework::results,
                    248: 					    $symb,$courseid,$domain,$name);
                    249: 	    &Apache::lonxml::debug('Store return message:'.$result);
                    250: 	}
1.67      albertel  251:     }
1.159     albertel  252:     return $result;
1.65      albertel  253: }
                    254: 
                    255: sub checkout_msg {
1.159     albertel  256:     return (<<ENDCHECKOUT);
1.65      albertel  257: <h2>The resource needs to be checked out</h2>
                    258: As a resource gets checked out, a unique timestamped ID is given to it, and a
                    259: permanent record is left in the system.<p />
                    260: <font color=red>
                    261: Checking out resources is subject to course policies, and may exclude future
                    262: credit even if done erroneously.<p />
1.91      albertel  263: </font>
                    264: <form name="checkout" method="POST" action="$ENV{'request.uri'}">
                    265: <input type="hidden" name="doescheckout" value="yes" />
                    266: <input type="button" name="checkoutbutton" value="Check out Exam for Viewing" onClick="javascript:if (confirm('Check out Exam?')) { document.checkout.submit(); }" />
1.65      albertel  267: </form>
                    268: ENDCHECKOUT
                    269: }
                    270: 
1.9       albertel  271: sub start_problem {
1.159     albertel  272:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.19      albertel  273: 
1.184     albertel  274:     if ( $Apache::inputtags::part ne '' ||
                    275: 	 $Apache::lonhomework::parsing_a_problem) {
                    276: 	&Apache::lonxml::error('Only one &lt;problem&gt; allowed in a .problem file');
                    277: 	#my $bodytext=&Apache::lonxml::get_all_text("/problem",$parser);
1.159     albertel  278: 	return '';
                    279:     }
1.184     albertel  280: 
                    281:     $Apache::lonhomework::parsing_a_problem=1;
1.161     albertel  282: #initialize globals
1.159     albertel  283:     $Apache::inputtags::part='0';
1.177     albertel  284:     @Apache::inputtags::partlist=('0');
1.159     albertel  285:     @Apache::inputtags::responselist = ();
1.177     albertel  286:     @Apache::inputtags::importlist = ();
1.159     albertel  287:     @Apache::inputtags::previous=();
                    288:     @Apache::inputtags::previous_version=();
                    289:     $Apache::structuretags::printanswer='No';
1.161     albertel  290:     @Apache::structuretags::whileconds=();
                    291:     @Apache::structuretags::whilebody=();
                    292:     @Apache::structuretags::whileline=();
1.166     albertel  293:     $Apache::lonhomework::scantronmode=0;
1.169     albertel  294:     $Apache::lonhomework::problemstatus=
                    295: 	&Apache::lonnet::EXT('resource.0.problemstatus');
1.166     albertel  296: 
                    297:     if (defined($ENV{'scantron.maxquest'})) {
                    298: 	$Apache::lonhomework::scantronmode=1;
                    299:     }
1.161     albertel  300: 
1.159     albertel  301:     if ($target ne 'analyze') {
                    302: 	&initialize_storage();
                    303: 	if ($target eq 'web') {
                    304: 	    &Apache::lonhomework::showhash(%Apache::lonhomework::history);
                    305: 	}
                    306: 	$Apache::lonhomework::type=&Apache::lonnet::EXT('resource.0.type');
                    307: 	&Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");
                    308:     }
1.164     albertel  309:     if ($Apache::lonhomework::type eq '' ) {
1.159     albertel  310: 	my $uri=$ENV{'request.uri'};
                    311: 	if ($uri=~/\.(\w+)$/) {
                    312: 	    $Apache::lonhomework::type=$1;
                    313: 	    &Apache::lonxml::debug("Using type of $1");
                    314: 	} else {
                    315: 	    $Apache::lonhomework::type='problem';
                    316: 	    &Apache::lonxml::debug("Using default type, problem, :$uri:");
                    317: 	}
1.87      albertel  318:     }
1.58      www       319: 
1.159     albertel  320:     #added vars to the scripting enviroment
                    321:     my $expression='$external::part='.$Apache::inputtags::part.';';
1.24      albertel  322:     &Apache::run::run($expression,$safeeval);
1.159     albertel  323:     my $status;
                    324:     my $accessmsg;
                    325: 
                    326:     #should get back a <html> or the neccesary stuff to start XML/MathML
                    327:     my ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
                    328: 	&page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
                    329:     if ($target eq 'tex' and $ENV{'request.symb'} =~ m/\.page_/) {$result='';}
                    330: 
                    331:     if ($target eq 'analyze') { my $rndseed=&setup_rndseed($safeeval); }
                    332:     if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
                    333: 	$target eq 'tex') {
                    334: 	#handle exam checkout
                    335: 	if ($Apache::lonhomework::type eq 'exam') {
                    336: 	    my $token=
                    337: 		$Apache::lonhomework::history{"resource.0.outtoken"};
                    338: 	    if (($ENV{'form.doescheckout'}) && (!$token)) {
                    339: 		$token=&Apache::lonxml::maketoken();
                    340: 		$Apache::lonhomework::history{"resource.0.outtoken"}=
                    341: 		    $token;
                    342: 	    }
                    343: 	    $body_tag_start.=&Apache::lonxml::printtokenheader($target,$token);
1.142     albertel  344: 	}
1.159     albertel  345: 
                    346: 	#handle rand seed in construction space
                    347: 	my $rndseed=&setup_rndseed($safeeval);
1.162     albertel  348: 	my ($symb)=&Apache::lonxml::whichuser();
1.163     albertel  349: 	if ($ENV{'request.state'} ne "construct" && $symb eq '') {
1.162     albertel  350: 	    $form_tag_start.='<input type="hidden" name="rndseed" value="'.
                    351: 		$rndseed.'" />'.
                    352: 		    '<input type="submit" name="resetdata"
1.164     albertel  353:                              value="New Problem Variation" />'.
                    354: 		    '<input type="hidden" name="username"
1.185     albertel  355:                              value="'.$ENV{'form.username'}.'" /> <br />';
1.162     albertel  356: 	}
1.159     albertel  357: 	($status,$accessmsg) = &Apache::lonhomework::check_access('0');
                    358: 	push (@Apache::inputtags::status,$status);
                    359: 	my $expression='$external::datestatus="'.$status.'";';
                    360: 	$expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
                    361: 	&Apache::run::run($expression,$safeeval);
                    362: 	&Apache::lonxml::debug("Got $status");
                    363: 	if (( $status eq 'CLOSED' ) ||
                    364: 	    ( $status eq 'UNCHECKEDOUT') ||
                    365: 	    ( $status eq 'BANNED') ||
                    366: 	    ( $status eq 'UNAVAILABLE')) {
                    367: 	    my $bodytext=&Apache::lonxml::get_all_text("/problem",$parser);
                    368: 	    if ( $target eq "web" ) {
                    369: 		$result.= $head_tag_start.'</head>';
                    370: 		my $msg=$body_tag_start;
                    371: 		if ($status eq 'UNAVAILABLE') {
                    372: 		    $result.='<h1>Unable to determine if this resource is open due to network problems. Please try again later.</h1>';
                    373: 		} else {
                    374: 		    $result.='<h1>Not open to be viewed</h1>';
                    375: 		}
                    376: 		if ($status eq 'CLOSED') {
                    377: 		    $msg.='The problem '.$accessmsg;
                    378: 		} elsif ($status eq 'UNCHECKEDOUT') {
                    379: 		    $msg.=&checkout_msg;
                    380: 		}
                    381: 		$result.=$msg.'<br />';
                    382: 	    } elsif ($target eq 'tex') {
                    383: 		$result.='\begin{document}\noindent \vskip 1 mm  \begin{minipage}{\textwidth}\vskip 0 mm';
                    384: 		if ($status eq 'UNAVAILABLE') {
                    385: 		    $result.='Unable to determine if this resource is open due to network problems. Please try again later.\vskip 0 mm ';
                    386: 		} else {
                    387: 		    $result.="Problem is not open to be viewed. It $accessmsg \\vskip 0 mm ";
                    388: 		}
                    389: 	    }
                    390: 	} elsif ($target eq 'web') {
                    391: 	    my $name= &get_resource_name($parstack,$safeeval);
                    392: 	    if ($status eq 'CAN_ANSWER') {
                    393: 		# create a page header and exit
                    394: 		$result.="$head_tag_start<title>$name</title></head>
1.158     sakharuk  395:               $body_tag_start \n $form_tag_start".	
1.159     albertel  396: 		  '<input type="hidden" name="submitted" value="yes" />';
                    397: 		if ($ENV{'request.state'} eq "construct") {
1.187     albertel  398: 		    $result.= &problem_web_to_edit_header($ENV{'form.rndseed'});
1.159     albertel  399: 		}
                    400: 		# if we are viewing someone else preserve that info
                    401: 		if (defined $ENV{'form.grade_symb'}) {
                    402: 		    foreach my $field ('symb','courseid','domain','username') {
                    403: 			$result .= '<input type="hidden" name="grade_'.$field.
                    404: 			    '" value="'.$ENV{"form.grade_$field"}.'" />'."\n";
                    405: 		    }
                    406: 		}
                    407: 	    } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER'
                    408: 		     || $status eq 'CLOSED' || $status eq 'UNAVALAILABLE') {
                    409: 		$result.=$head_tag_start.
                    410: 		    "<title>$name</title></head>\n$body_tag_start\n";
                    411: 	    }
                    412: 	} elsif ($target eq 'tex') {
1.192     sakharuk  413: 	    my $startminipage = '';
1.191     sakharuk  414: 	    if (not $ENV{'form.problem_split'}=~/yes/) {
1.192     sakharuk  415: 		$startminipage = '\begin{minipage}{\textwidth}';
1.178     sakharuk  416: 	    }
1.159     albertel  417: 	    my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);
                    418: 	    if ($name eq '') {
                    419: 		$name=&Apache::lonnet::EXT('resource.title');
                    420: 		if ($name eq 'con_lost') { $name = ''; }
                    421: 	    }
                    422: 	    $Apache::lonhomework::name=$name;
                    423: 	    my $id = $Apache::inputtags::part;
                    424: 	    my $weight = &Apache::lonnet::EXT("resource.$id.weight");
                    425: 	    my $allkeys=&Apache::lonnet::metadata($ENV{'request.uri'},'keys');
                    426: 	    my @allkeys = split /,/,$allkeys;
                    427: 	    my $allow_print_points = 0;
                    428: 	    foreach my $partial_key (@allkeys) {
                    429: 		if ($partial_key=~m/weight/) {
                    430: 		    $allow_print_points++;
                    431: 		}
                    432: 	    }
                    433: 	    my $duedate = &Apache::lonnet::EXT("resource.$id.duedate"); 
                    434: 	    $duedate = POSIX::strftime("%c",localtime($duedate));
                    435: 	    my $temp_file;
                    436: 	    my $filename = "/home/httpd/prtspool/$ENV{'user.name'}_$ENV{'user.domain'}_printout.due";
                    437: 	    if (-e $filename) {
                    438: 		$temp_file = Apache::File->new($filename);
                    439: 	    } else {
                    440: 		$temp_file = Apache::File->new('>>'.$filename);
                    441: 	    }
                    442: 	    my @due_file_content = <$temp_file>;
                    443: 	    my $due_file_content = $due_file_content[$#due_file_content];
                    444: 	    chomp $due_file_content;
                    445: 	    my $name_of_resourse= &get_resource_name($parstack,$safeeval);
                    446: 	    if ($due_file_content ne $duedate) {
                    447: 		$temp_file = Apache::File->new('>'.$filename);
                    448: 		print $temp_file "$duedate\n";
                    449: 		if (not $ENV{'request.symb'} =~ m/\.page_/) {
                    450: 		    if(not $duedate=~m/1969/ and $Apache::lonhomework::type ne 'exam') {
1.178     sakharuk  451: 			$result .= '\begin{document} \typeout{STAMPOFPASSEDRESOURCESTART Resource <h2>"'.$name_of_resourse.'"</h2> located in <br /><small><b>'.$ENV{'request.uri'}.'</b></small><br /> STAMPOFPASSEDRESOURCEEND} \noindent\textit{Due date: '.$duedate.'} \vskip 1 mm\noindent '.$startminipage;	
1.159     albertel  452: 		    } else {
1.178     sakharuk  453: 			$result .= '\begin{document} \typeout{STAMPOFPASSEDRESOURCESTART Resource <h2>"'.$name_of_resourse.'"</h2> located in <br /><small><b>'.$ENV{'request.uri'}.'</b></small><br /> STAMPOFPASSEDRESOURCEEND} \noindent \vskip 1 mm \noindent'.$startminipage;
1.159     albertel  454: 			if ($Apache::lonhomework::type eq 'exam' and $allow_print_points==1) { $result .= '\fbox{\textit{'.$weight.' pt}}';}
                    455: 		    }
1.104     sakharuk  456: 		} else {
1.159     albertel  457: 		    $result .= '\vskip 1mm\textit{Due date: '.$duedate.'} \\\\\\\\';
1.104     sakharuk  458: 		}
1.101     sakharuk  459: 	    } else {
1.159     albertel  460: 		if (not $ENV{'request.symb'} =~ m/\.page_/) {
1.178     sakharuk  461: 		    $result .= '\begin{document} \typeout{STAMPOFPASSEDRESOURCESTART Resource <h2>"'.$name_of_resourse.'"</h2> located in <br /><small><b>'.$ENV{'request.uri'}.'</b></small><br /> STAMPOFPASSEDRESOURCEEND} \noindent \vskip 1 mm\noindent'.$startminipage;	
1.159     albertel  462: 		    if (($Apache::lonhomework::type eq 'exam') and ($allow_print_points==1)) { $result .= '\fbox{\textit{'.$weight.' pt}}';}
                    463: 		} else {
                    464: 		    $result .= '\vskip 1mm \\\\\\\\';
                    465: 		}
                    466: 	    }
1.99      sakharuk  467: 	}
1.159     albertel  468:     } elsif ($target eq 'edit') {
                    469: 	$result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
                    470: 	    &problem_edit_header();
                    471: 	my $temp=&Apache::edit::insertlist($target,$token);
                    472: 	$result.=$temp;
                    473:     } elsif ($target eq 'modified') {
                    474: 	$result=$token->[4];
                    475: 	$result.=&Apache::edit::handle_insert();
                    476:     } else {
                    477: 	# page_start returned a starting result, delete it if we don't need it
                    478: 	$result = '';
1.99      sakharuk  479:     }
1.159     albertel  480:     return $result;
1.9       albertel  481: }
                    482: 
                    483: sub end_problem {
1.159     albertel  484:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                    485:     my $result='';
                    486:     my $status=$Apache::inputtags::status['-1'];
                    487:     if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ||
                    488: 	$target eq 'tex') {
                    489: 	if ( $target eq 'grade' && $Apache::inputtags::part eq '0' &&
                    490: 	     $status eq 'CAN_ANSWER' ) {
                    491: 	    # if part is zero, no <part>s existed, so we need to the grading
                    492: 	    &Apache::inputtags::grade;
                    493: 	} elsif ( ($target eq 'web' || $target eq 'tex') &&
                    494: 		  $Apache::inputtags::part eq '0' &&
                    495: 		  $status ne 'UNCHECKEDOUT') {
                    496: 	    # if part is zero, no <part>s existed, so we need show the current
                    497: 	    # grading status
                    498: 	    my $gradestatus = &Apache::inputtags::gradestatus($Apache::inputtags::part,$target);
                    499: 	    $result.= $gradestatus;
                    500: 	}
                    501: 	if (
                    502: 	    (($target eq 'web') && ($ENV{'request.state'} ne 'construct')) ||
                    503: 	    ($target eq 'answer') || ($target eq 'tex')
                    504: 	   ) {
                    505: 	    if ($status eq 'CAN_ANSWER') {
1.172     albertel  506: 		if ($target ne 'tex' &&
                    507: 		    $ENV{'form.answer_output_mode'} ne 'tex') {
                    508: 		    $result.="</form></body>\n";
1.159     albertel  509: 		}
                    510: 	    } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' ||
                    511: 		     $status eq 'UNCHECKEDOUT' ) {
1.189     sakharuk  512: 		if ($target ne 'tex' &&
                    513: 		    $ENV{'form.answer_output_mode'} ne 'tex') {
1.159     albertel  514: 		    $result.="</body>\n";
                    515: 		}
                    516: 	    }
                    517: 	    if ($target eq 'web') {
                    518: 		$result.=&Apache::lonxml::xmlend();
                    519: 	    } elsif ($target eq 'tex') {
1.178     sakharuk  520: 		my $endminipage = '';
1.191     sakharuk  521: 		if (not $ENV{'form.problem_split'}=~/yes/) {
1.178     sakharuk  522: 		    $endminipage = '\end{minipage}';
                    523: 		}
1.174     sakharuk  524: 		$result .= '\keephidden{ENDOFPROBLEM}\vskip 0.5mm\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}';
1.159     albertel  525: 		if (not $ENV{'request.symb'} =~ m/\.page_/) {
1.178     sakharuk  526: 		    $result .= $endminipage.'\end{document} ';
1.159     albertel  527: 		} else {
                    528: 		    $result .= '';
                    529: 		}
                    530: 	    }
                    531: 	}
                    532: 	if ($target eq 'grade') {
                    533: 	    &Apache::lonhomework::showhash(%Apache::lonhomework::results);
                    534: 	    &finalize_storage();
                    535: 	}
1.172     albertel  536: 	if ($target eq 'answer' && ($ENV{'request.state'} eq 'construct')
1.173     albertel  537: 	    && $ENV{'form.answer_output_mode'} ne 'tex') {
1.172     albertel  538: 	    $result.='</html>'; # normally we get it from xmlend, but in CSTR
                    539: 	                        # we always show answer mode too.
1.159     albertel  540: 	}
                    541:     } elsif ($target eq 'meta') {
                    542: 	if ($Apache::inputtags::part eq '0') {
1.179     albertel  543: 	    @Apache::inputtags::response=();
1.159     albertel  544: 	    $result=&Apache::response::mandatory_part_meta;
                    545: 	}
                    546:     } elsif ($target eq 'edit') {
                    547: 	&Apache::lonxml::debug("in end_problem with $target, edit");
                    548: 	$result = &problem_edit_footer();
                    549:     }
1.155     albertel  550: 
1.177     albertel  551:     if ($ENV{'request.state'} eq 'construct' && $target eq 'web') {
                    552: 	&Apache::inputtags::check_for_duplicate_ids();
                    553:     }
1.159     albertel  554:     undef(%Apache::lonhomework::history);
                    555:     undef(%Apache::lonhomework::results);
                    556:     undef($Apache::inputtags::part);
                    557:     undef($Apache::lonhomework::parsing_a_problem);
                    558: 
                    559:     return $result;
1.48      albertel  560: }
                    561: 
1.108     albertel  562: 
1.48      albertel  563: sub start_library {
1.159     albertel  564:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                    565:     my ($result,$head_tag_start,$body_tag_start,$form_tag_start);
1.109     albertel  566: 
1.159     albertel  567:     if ($target eq 'edit') {
                    568: 	($result,$head_tag_start,$body_tag_start,$form_tag_start)=
                    569: 	    &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
                    570: 	$result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
                    571: 	    &problem_edit_header();
                    572: 	my $temp=&Apache::edit::insertlist($target,$token);
                    573: 	$result.=$temp;
                    574:     } elsif ($target eq 'modified') {
                    575: 	$result=$token->[4];
                    576: 	$result.=&Apache::edit::handle_insert();
                    577:     } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
                    578: 	     $ENV{'request.state'} eq "construct" ) {
                    579: 	($result,$head_tag_start,$body_tag_start,$form_tag_start)=
                    580: 	    &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
                    581: 	my $name=&get_resource_name($parstack,$safeeval);
                    582: 	my $rndseed=&setup_rndseed($safeeval);
                    583: 	$result.="$head_tag_start<title>$name</title></head>
1.105     albertel  584:               $body_tag_start \n $form_tag_start".	
1.159     albertel  585: 		  '<input type="hidden" name="submitted" value="yes" />';
                    586: 	$result.=&problem_web_to_edit_header($rndseed);
                    587:     }
                    588:     return $result;
1.48      albertel  589: }
                    590: 
                    591: sub end_library {
1.159     albertel  592:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                    593:     my $result='';
                    594:     if ($target eq 'edit') {
                    595: 	$result=&problem_edit_footer();
                    596:     } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
                    597: 	     $ENV{'request.state'} eq "construct") {
                    598: 	$result.='</form></body>'.&Apache::lonxml::xmlend();
                    599:     }
                    600:     return $result;
1.197     www       601: }
                    602: 
                    603: sub start_definetag {
                    604:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                    605: 
                    606:     my $result;
                    607: 
                    608:     my $name = $token->[2]->{'name'};
                    609:     my $skip=&Apache::lonxml::get_all_text("/definetag",$parser);
                    610:     if ($name=~/^\//) {
                    611: 	$result=
                    612:  '<br /><table bgcolor="#FFBBBB"><tr><th>END <tt>'.$name.'</tt></th></tr>';
                    613:     } else {
                    614: 	$result=
                    615:  '<br /><table bgcolor="#BBFFBB"><tr><th>BEGIN <tt>'.$name.'</tt></th></tr>';
                    616:     }
                    617:     $skip=~s/\</\&lt\;/gs;
                    618:     $skip=~s/\>/\&gt\;/gs;
                    619:     $result.='<tr><td><pre>'.$skip.'</pre></td></tr></table>';
                    620:     return $result;
                    621: }
                    622: 
                    623: sub end_definetag {
                    624:     return '';
1.1       albertel  625: }
                    626: 
                    627: sub start_block {
1.201   ! albertel  628:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1.131     albertel  629: 
                    630:     my $result;
1.1       albertel  631: 
1.160     albertel  632:     if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
1.131     albertel  633: 	$target eq 'tex' || $target eq 'analyze') {
1.159     albertel  634: 	my $code = $token->[2]->{'condition'};
1.201   ! albertel  635: 	if (defined($code)) {
1.137     albertel  636: 	    if (!$Apache::lonxml::default_homework_loaded) {
                    637: 		&Apache::lonxml::default_homework_load($safeeval);
                    638: 	    }
1.131     albertel  639: 	    $result = &Apache::run::run($code,$safeeval);
                    640: 	    &Apache::lonxml::debug("block :$code: returned :$result:");
                    641: 	} else {
                    642: 	    $result='1';
                    643: 	}
                    644: 	if ( ! $result ) {
1.201   ! albertel  645: 	    my $skip=&Apache::lonxml::get_all_text("/block",$parser,$style);
1.131     albertel  646: 	    &Apache::lonxml::debug("skipping ahead :$skip: $$parser[-1]");
                    647: 	}
                    648: 	$result='';
                    649:     } elsif ($target eq 'edit') {
                    650: 	$result .=&Apache::edit::tag_start($target,$token);
                    651: 	$result .=&Apache::edit::text_arg('Test Condition:','condition',
                    652: 					  $token,40);
                    653: 	$result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
                    654:     } elsif ($target eq 'modified') {
                    655: 	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
                    656: 						     $safeeval,'condition');
                    657: 	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
1.38      albertel  658:     }
1.131     albertel  659:     return $result;
1.1       albertel  660: }
                    661: 
                    662: sub end_block {
1.167     www       663:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                    664:     my $result;
                    665:     if ($target eq "edit") {
                    666: 	$result.= &Apache::edit::tag_end($target,$token,'');
                    667:     }
                    668:     return $result;
                    669: }
                    670: 
                    671: sub start_languageblock {
1.201   ! albertel  672:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1.167     www       673: 
                    674:     my $result;
                    675: 
                    676:     if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
                    677: 	$target eq 'tex' || $target eq 'analyze') {
1.201   ! albertel  678: 	my $include = $token->[2]->{'include'};
        !           679: 	my $exclude = $token->[2]->{'exclude'};
        !           680:         my %languages=&Apache::loncommon::display_languages();
        !           681:         $result='1';
        !           682: 	if ($include) {
        !           683:             $result='';
        !           684:             foreach (split(/\,/,$include)) {
        !           685:                 if ($languages{$_}) { $result='1'; }
        !           686:             }
        !           687: 	}
        !           688:         if ($exclude) {
        !           689:             foreach (split(/\,/,$exclude)) {
        !           690:                 if ($languages{$_}) { $result='0'; }
        !           691:             }
        !           692: 	}
        !           693: 	if ( ! $result ) {
        !           694: 	    my $skip=&Apache::lonxml::get_all_text("/languageblock",$parser,
        !           695: 						   $style);
        !           696: 	    &Apache::lonxml::debug("skipping ahead :$skip: $$parser[-1]");
        !           697: 	}
        !           698: 	$result='';
1.167     www       699:     } elsif ($target eq 'edit') {
                    700: 	$result .=&Apache::edit::tag_start($target,$token);
                    701: 	$result .=&Apache::edit::text_arg('Include Language:','include',
                    702: 					  $token,40);
                    703: 	$result .=&Apache::edit::text_arg('Exclude Language:','exclude',
                    704: 					  $token,40);
                    705: 	$result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
                    706:     } elsif ($target eq 'modified') {
                    707: 	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
1.168     albertel  708: 						     $safeeval,'include',
                    709: 						     'exclude');
1.167     www       710: 	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
                    711:     }
                    712:     return $result;
                    713: }
                    714: 
                    715: sub end_languageblock {
1.170     www       716:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                    717:     my $result;
1.201   ! albertel  718:     if ($target eq "edit") {
1.170     www       719: 	$result.= &Apache::edit::tag_end($target,$token,'');
                    720:     }
                    721:     return $result;
                    722: }
                    723: 
                    724: sub start_instructorcomment {
1.201   ! albertel  725:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1.170     www       726: 
                    727:     my $result;
                    728: 
                    729:     if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
                    730: 	$target eq 'tex' || $target eq 'analyze') {
                    731:         $result=($ENV{'request.role'}=~/^(in|cc|au|ca|li)/);
                    732: 	if ( ! $result ) {
1.201   ! albertel  733: 	    my $skip=&Apache::lonxml::get_all_text("/instructorcomment",
        !           734: 						   $parser,$style);
1.170     www       735: 	    &Apache::lonxml::debug("skipping ahead :$skip: $$parser[-1]");
                    736: 	}
                    737: 	$result='';
                    738:     } elsif ($target eq 'edit') {
                    739: 	$result .=&Apache::edit::tag_start($target,$token);
                    740: 	$result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
                    741:     }
                    742:     return $result;
                    743: }
                    744: 
                    745: sub end_instructorcomment {
1.159     albertel  746:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.160     albertel  747:     my $result;
                    748:     if ($target eq "edit") {
                    749: 	$result.= &Apache::edit::tag_end($target,$token,'');
                    750:     }
                    751:     return $result;
1.4       tsai      752: }
                    753: 
                    754: sub start_while {
1.159     albertel  755:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                    756: 
1.160     albertel  757:     my $result;
1.161     albertel  758:     if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
1.160     albertel  759: 	$target eq 'tex' || $target eq 'analyze') {
                    760: 	my $code = $token->[2]->{'condition'};
1.4       tsai      761: 
1.160     albertel  762: 	push( @Apache::structuretags::whileconds, $code);
                    763: 	if (!$Apache::lonxml::default_homework_loaded) {
                    764: 	    &Apache::lonxml::default_homework_load($safeeval);
                    765: 	}
                    766: 	my $result = &Apache::run::run($code,$safeeval);
1.161     albertel  767: 	my $bodytext=&Apache::lonxml::get_all_text("/while",$parser);
1.160     albertel  768: 	push( @Apache::structuretags::whilebody, $bodytext);
1.161     albertel  769: 	push( @Apache::structuretags::whileline, $token->[5]);
                    770: 	&Apache::lonxml::debug("s code $code got -$result-");
1.160     albertel  771: 	if ( $result ) {
                    772: 	    &Apache::lonxml::newparser($parser,\$bodytext);
                    773: 	}
                    774:     } elsif ($target eq 'edit') {
                    775: 	$result .=&Apache::edit::tag_start($target,$token);
                    776: 	$result .=&Apache::edit::text_arg('Test Condition:','condition',
                    777: 					  $token,40);
                    778: 	$result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
                    779:     } elsif ($target eq 'modified') {
                    780: 	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
                    781: 						     $safeeval,'condition');
                    782: 	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
1.159     albertel  783:     }
1.160     albertel  784:     return $result;
1.4       tsai      785: }
                    786: 
                    787: sub end_while {
1.159     albertel  788:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.160     albertel  789:     my $result;
                    790: 
                    791:     if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
                    792: 	$target eq 'tex' || $target eq 'analyze') {
                    793: 	my $code = pop(@Apache::structuretags::whileconds);
                    794: 	my $bodytext = pop(@Apache::structuretags::whilebody);
1.161     albertel  795: 	my $line = pop(@Apache::structuretags::whileline);
                    796: 	my $return = &Apache::run::run($code,$safeeval);
                    797: 	my $starttime=time;
                    798: 	my $error=0;
                    799: 	while ($return) {
                    800: 	    if (time-$starttime >
                    801: 		$Apache::lonnet::perlvar{'lonScriptTimeout'}) {
                    802: 		$return = 0; $error=1; next;
                    803: 	    }
                    804: 	    $result.=&Apache::scripttag::xmlparse($bodytext);
                    805: 	    $return = &Apache::run::run($code,$safeeval);
                    806: 	}
                    807: 	if ($error) {
                    808: 	    &Apache::lonxml::error('<pre>Code ran too long. It ran for more than '.$Apache::lonnet::perlvar{'lonScriptTimeout'}.' seconds occured while running &lt;while$gt; on line '.$line.'</pre>');
1.160     albertel  809: 	}
                    810:     } elsif ($target eq "edit") {
                    811: 	$result.= &Apache::edit::tag_end($target,$token,'');
1.159     albertel  812:     }
1.160     albertel  813:     return $result;
1.1       albertel  814: }
1.6       tsai      815: 
1.160     albertel  816: # <randomlist show="1">
1.6       tsai      817: #  <tag1>..</tag1>
                    818: #  <tag2>..</tag2>
                    819: #  <tag3>..</tag3>
1.160     albertel  820: #  ...
1.6       tsai      821: # </randomlist>
                    822: sub start_randomlist {
1.159     albertel  823:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                    824:     my $result;
                    825:     if ($target eq 'answer' || $target eq 'grade' || $target eq 'web' ||
                    826: 	$target eq 'tex' || $target eq 'analyze') {
                    827: 	my $body= &Apache::lonxml::get_all_text("/randomlist",$parser);
                    828: 	my $b_parser= HTML::TokeParser->new(\$body);
                    829: 	my $b_tok;
                    830: 	my @randomlist;
                    831: 	my $list_item;
                    832: 	while($b_tok = $b_parser->get_token() ) {
                    833: 	    if($b_tok->[0] eq 'S') { # start tag
                    834: 		# get content of the tag until matching end tag
                    835: 		# get all text upto the matching tag
                    836: 		# and push the content into @randomlist
                    837: 		$list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],
                    838: 							   $b_parser);
                    839: 		$list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
                    840: 		push(@randomlist,$list_item);
                    841: 		#  print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4],
                    842:                 #         $list_item</b>";
                    843: 	    }
                    844: 	    if($b_tok->[0] eq 'T') { # text
                    845: 		# what to do with text in between tags?
                    846: 		#  print "<b>TEXT $b_tok->[1]</b><br />";
                    847: 	    }
                    848: 	    # if($b_tok->[0] eq 'E') { # end tag, should not happen
                    849: 	    #  print "<b>END-TAG $b_tok->[1]</b><br />";
                    850: 	    # }
                    851: 	}
                    852: 	my @idx_arr = (0 .. $#randomlist);
                    853: 	&Apache::structuretags::shuffle(\@idx_arr);
                    854: 	my $bodytext = '';
                    855: 	my $show=$#randomlist;
                    856: 	my $showarg=&Apache::lonxml::get_param('show',$parstack,$safeeval);
                    857: 	$showarg--;
                    858: 	if ( ($showarg >= 0) && ($showarg < $show) ) { $show = $showarg; }
                    859: 	for(0 .. $show) {
                    860: 	    $bodytext .= "$randomlist[ $idx_arr[$_] ]";
                    861: 	}
                    862: 	&Apache::lonxml::newparser($parser,\$bodytext);
                    863:     } elsif ($target eq 'edit' ) {
                    864: 	$result .=&Apache::edit::tag_start($target,$token);
                    865: 	$result .=&Apache::edit::text_arg('Maximum Tags to Show:','show',
                    866: 					   $token,5);
                    867: 	$result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
                    868:     } elsif ($target eq 'modified' ) {
                    869: 	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
                    870: 						     $safeeval,'show');
                    871: 	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
                    872:     }
                    873:     return $result;
1.7       tsai      874: }
                    875: 
                    876: sub shuffle {
                    877:     my $a=shift;
                    878:     my $i;
1.70      albertel  879:     if (defined(@$a)) {
1.159     albertel  880: 	&Apache::response::setrandomnumber();
                    881: 	for($i=@$a;--$i;) {
                    882: 	    my $j=int(&Math::Random::random_uniform() * ($i+1));
                    883: 	    next if $i == $j;
                    884: 	    @$a[$i,$j] = @$a[$j,$i];
                    885: 	}
1.7       tsai      886:     }
1.6       tsai      887: }
                    888: 
                    889: sub end_randomlist {
1.159     albertel  890:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                    891:     my $result;
                    892:     if ($target eq 'edit' ) {
                    893: 	$result=&Apache::edit::tag_end($target,$token,
                    894: 				       'End Randomly Parsed Block');
                    895:     }
                    896:     return $result;
1.6       tsai      897: }
                    898: 
1.11      albertel  899: sub start_part {
1.159     albertel  900:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                    901:     my $result='';
                    902:     my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
                    903:     if ($id eq '') { $id = $Apache::lonxml::curdepth; }
                    904:     $Apache::inputtags::part=$id;
1.177     albertel  905:     push(@Apache::inputtags::partlist,$id);
                    906:     @Apache::inputtags::response=();
1.159     albertel  907:     @Apache::inputtags::previous=();
                    908:     @Apache::inputtags::previous_version=();
1.169     albertel  909:     $Apache::lonhomework::problemstatus=
                    910: 	&Apache::lonnet::EXT("resource.$id.problemstatus");
1.159     albertel  911:     my $hidden=&Apache::loncommon::check_if_partid_hidden($Apache::inputtags::part);
                    912: 
                    913:     if ($target eq 'meta') {
                    914: 	return &Apache::response::mandatory_part_meta;
                    915:     } elsif ($target eq 'web' || $target eq 'grade' ||
                    916: 	     $target eq 'answer' || $target eq 'tex') {
                    917: 	if ($hidden) {
                    918: 	    my $bodytext=&Apache::lonxml::get_all_text("/part",$parser);
                    919: 	} else {
                    920: 	    my ($status,$accessmsg) = &Apache::lonhomework::check_access($id);
                    921: 	    push (@Apache::inputtags::status,$status);
                    922: 	    my $expression='$external::datestatus="'.$status.'";';
                    923: 	    $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
                    924: 	    &Apache::run::run($expression,$safeeval);
                    925: 	    if ( $status eq 'CLOSED' ) {
                    926: 		my $bodytext=&Apache::lonxml::get_all_text("/part",$parser);
                    927: 		if ( $target eq "web" ) {
                    928: 		    $result="<br />Part is not open to be viewed. It $accessmsg<br />";
                    929: 		} elsif ( $target eq 'tex' ) {
1.195     sakharuk  930: 		    if (not $ENV{'form.problem_split'}=~/yes/) {
                    931: 			$result="\\end{minipage}\\vskip 0 mm Part is not open to be viewed. It $accessmsg \\\\\\begin{minipage}{\\textwidth}";
                    932: 		    } else {
                    933: 			$result="\\vskip 0 mm Part is not open to be viewed. It $accessmsg \\\\";
                    934: 		    }
1.159     albertel  935: 		}
                    936: 	    } else {
                    937: 		if ($target eq 'tex') {
1.195     sakharuk  938: 		    if (not $ENV{'form.problem_split'}=~/yes/) {
                    939: 			$result.='\noindent \end{minipage}\vskip 0 mm \noindent \begin{minipage}{\textwidth}\noindent';
                    940: 		    }
1.159     albertel  941: 		    my $weight = &Apache::lonnet::EXT("resource.$id.weight");
                    942: 		    if ($Apache::lonhomework::type eq 'exam') { $result .= '\fbox{\textit{'.$weight.' pt}}';}
                    943: 		}
                    944: 	    }
                    945: 	}
                    946:     } elsif ($target eq 'edit') {
                    947: 	$result.=&Apache::edit::tag_start($target,$token);
                    948: 	$result.=&Apache::edit::text_arg('Part ID:','id',$token).
                    949: 	    &Apache::loncommon::help_open_topic("Part_Tag_Edit_Help").
                    950: 		&Apache::edit::end_row().&Apache::edit::start_spanning_row();
                    951:     } elsif ($target eq 'modified') {
                    952: 	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
                    953: 						     $safeeval,'id');
                    954: 	if ($constructtag) {
                    955: 	    $result = &Apache::edit::rebuild_tag($token);
                    956: 	    $result.=&Apache::edit::handle_insert();
                    957: 	}
                    958:     }
                    959:     return $result;
1.11      albertel  960: }
                    961: 
                    962: sub end_part {
1.159     albertel  963:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                    964:     &Apache::lonxml::debug("in end_part $target ");
                    965:     my $status=$Apache::inputtags::status['-1'];
                    966:     my $hidden=&Apache::loncommon::check_if_partid_hidden($Apache::inputtags::part);
                    967:     my $result='';
                    968:     if ( $target eq 'meta' ) {
                    969: 	$result='';
                    970:     } elsif ( $target eq 'grade' && $status eq 'CAN_ANSWER' && !$hidden) {
                    971: 	$result=&Apache::inputtags::grade;
                    972:     } elsif (($target eq 'web' || $target eq 'tex') && !$hidden ) {
                    973: 	my $gradestatus=&Apache::inputtags::gradestatus($Apache::inputtags::part,
                    974: 							$target);
                    975: 	if ($Apache::lonhomework::type eq 'exam') {$gradestatus='';}
                    976: 	$result=$gradestatus;
1.181     albertel  977:     } elsif ($target eq 'edit') {
                    978: 	$result=&Apache::edit::end_table();
1.159     albertel  979:     }
                    980:     pop @Apache::inputtags::status;
                    981:     $Apache::inputtags::part='';
                    982:     return $result;
1.11      albertel  983: }
1.1       albertel  984: 
1.25      albertel  985: sub start_preduedate {
1.159     albertel  986:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                    987:     if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
                    988: 	if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
                    989: 	    $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' &&
                    990: 	    $Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
                    991: 	    &Apache::lonxml::get_all_text("/preduedate",$parser);
                    992: 	}
1.24      albertel  993:     }
1.159     albertel  994:     return '';
1.24      albertel  995: }
                    996: 
1.25      albertel  997: sub end_preduedate {
1.159     albertel  998:     return '';
1.24      albertel  999: }
                   1000: 
1.25      albertel 1001: sub start_postanswerdate {
1.159     albertel 1002:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                   1003:     if ($target eq 'web' || $target eq 'grade' || $target eq 'tex') {
                   1004: 	if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
                   1005: 	    &Apache::lonxml::get_all_text("/postanswerdate",$parser);
                   1006: 	}
                   1007:     } elsif ($target eq 'tex') {
                   1008: 	return '\vskip 0 mm \noindent';
                   1009:     }
                   1010:     return '';
1.24      albertel 1011: }
                   1012: 
1.25      albertel 1013: sub end_postanswerdate {
1.159     albertel 1014:     return '';
1.24      albertel 1015: }
                   1016: 
1.25      albertel 1017: sub start_notsolved {
1.159     albertel 1018:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                   1019:     if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
                   1020: 	$target eq 'tex') {
                   1021: 	my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
                   1022: 	&Apache::lonxml::debug("not solved has :$gradestatus:");
                   1023: 	if ($gradestatus =~ /^correct/) {
                   1024: 	    &Apache::lonxml::debug("skipping");
                   1025: 	    &Apache::lonxml::get_all_text("/notsolved",$parser);
                   1026: 	}
1.24      albertel 1027:     }
1.159     albertel 1028:     return '';
1.24      albertel 1029: }
                   1030: 
1.25      albertel 1031: sub end_notsolved {
1.159     albertel 1032:     return '';
1.24      albertel 1033: }
                   1034: 
                   1035: sub start_solved {
1.159     albertel 1036:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                   1037:     if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
                   1038: 	$target eq 'tex') {
                   1039: 	my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
                   1040: 	if ($gradestatus !~ /^correct/) {
                   1041: 	    &Apache::lonxml::get_all_text("/solved",$parser);
                   1042: 	}
1.24      albertel 1043:     }
1.159     albertel 1044:     return '';
1.24      albertel 1045: }
                   1046: 
                   1047: sub end_solved {
1.159     albertel 1048:     return '';
1.24      albertel 1049: }
1.34      albertel 1050: 
                   1051: sub start_startouttext {
1.159     albertel 1052:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                   1053:     my @result=(''.'');
                   1054:     if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
                   1055:     return (@result);
1.34      albertel 1056: }
1.159     albertel 1057: 
1.34      albertel 1058: sub end_startouttext {
1.159     albertel 1059:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                   1060:     my $result='';
                   1061:     my $text='';
                   1062: 
                   1063:     if ($target eq 'edit') {
                   1064: 	$text=&Apache::lonxml::get_all_text("endouttext",$parser);
                   1065: 	$result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
1.42      albertel 1066: <td>Delete:".
1.159     albertel 1067:                  &Apache::edit::deletelist($target,$token)
                   1068: 		 ."</td>
1.42      albertel 1069: <td>".
1.159     albertel 1070:                  &Apache::edit::insertlist($target,$token).
                   1071: 		 &Apache::edit::end_row().
                   1072:                  &Apache::edit::start_spanning_row()."\n"
1.188     bowersj2 1073: 		 . &Apache::loncommon::helpLatexCheatsheet () .
1.159     albertel 1074: 		 &Apache::edit::editfield($token->[1],$text,"",80,4);
                   1075:     }
                   1076:     if ($target eq 'modified') {
                   1077: 	$text=&Apache::lonxml::get_all_text("endouttext",$parser);
                   1078: 	$result='<startouttext />'.&Apache::edit::modifiedfield();
                   1079:     }
                   1080:     if ($target eq 'tex') {
                   1081: 	$result .= '\noindent ';
                   1082:     }
                   1083:     return $result;
1.34      albertel 1084: }
1.159     albertel 1085: 
1.34      albertel 1086: sub start_endouttext {
1.159     albertel 1087:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                   1088:     my $result='';
                   1089:     if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
                   1090:     if ($target eq "modified") {
                   1091: 	$result='<endouttext />'.
                   1092: 	    &Apache::edit::handle_insertafter('startouttext'); }
                   1093:     return $result;
1.34      albertel 1094: }
1.159     albertel 1095: 
1.34      albertel 1096: sub end_endouttext {
1.159     albertel 1097:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                   1098:     my @result=('','');
                   1099:     if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
                   1100:     return (@result);
1.34      albertel 1101: }
1.159     albertel 1102: 
1.45      albertel 1103: sub delete_startouttext {
1.159     albertel 1104:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                   1105:     #  my $text=&Apache::lonxml::get_all_text("endouttext",$parser);
                   1106:     my $text=$$parser['-1']->get_text("/endouttext");
                   1107:     my $ntoken=$$parser['-1']->get_token();
                   1108:     &Apache::lonxml::debug("Deleting :$text: and :$ntoken->[0]:$ntoken->[1]:$ntoken->[2]: for startouttext");
                   1109:     &Apache::lonxml::end_tag($tagstack,$parstack,$ntoken);
                   1110:     # Deleting 2 parallel tag pairs, but we need the numbers later to look like
                   1111:     # they did the last time round
                   1112:     &Apache::lonxml::increasedepth($ntoken);
                   1113:     &Apache::lonxml::decreasedepth($ntoken);
                   1114:     return 1;
1.193     www      1115: }
                   1116: 
                   1117: sub start_simpleeditbutton {
                   1118:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                   1119:     my $result='';
                   1120:     if (($target eq 'web') &&
                   1121:         (&Apache::lonnet::allowed('srm',$ENV{'request.course.id'}))) {
                   1122:         my $url=$ENV{'REQUEST_URI'};
                   1123:         $url=~s/\?.*$//;
1.194     www      1124: 	$result='<table width="100%" bgcolor="#FFFFAA" border="2"><tr><td>'.
1.196     www      1125:                 '<a href="'.$url.'/smpedit">Simple Problem Editor</a> - Note: it can take up to 10 minutes for changes to take effect for all users.'.
                   1126: &Apache::loncommon::help_open_topic('Caching').'</td></tr></table><br />';
1.193     www      1127:     }
                   1128:     return $result;
                   1129: }
                   1130: 
                   1131: sub end_simpleeditbutton {
                   1132:     return '';
1.45      albertel 1133: }
1.34      albertel 1134: 
1.1       albertel 1135: 1;
                   1136: __END__

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