Annotation of loncom/homework/structuretags.pm, revision 1.127

1.34      albertel    1: # The LearningOnline Network with CAPA 
                      2: # definition of tags that give a structure to a document
1.74      albertel    3: #
1.127   ! matthew     4: # $Id: structuretags.pm,v 1.126 2002/10/14 20:48:36 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: 
1.1       albertel   32: package Apache::structuretags; 
                     33: 
                     34: use strict;
                     35: use Apache::lonnet;
1.101     sakharuk   36: use Apache::File();
1.1       albertel   37: 
1.78      harris41   38: BEGIN {
1.48      albertel   39:   &Apache::lonxml::register('Apache::structuretags',('block','while','randomlist','problem','library','web','tex','part','preduedate','postanswerdate','solved','notsolved','startouttext','endouttext'));
1.37      albertel   40: #  &Apache::lonxml::register_insert('problem','',('part','postanswerdate','preduedate'))
1.10      albertel   41: }
                     42: 
                     43: sub start_web {
1.40      albertel   44:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.10      albertel   45:   my $bodytext=&Apache::lonxml::get_all_text("/web",$$parser[$#$parser]);
1.19      albertel   46:   if ($target eq 'web') {
                     47:     return $bodytext;
                     48:   } 
                     49:   return '';
1.10      albertel   50: }
                     51: 
                     52: sub end_web {
1.44      ng         53:     return '';
1.10      albertel   54: }
                     55: 
                     56: sub start_tex {
1.40      albertel   57:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.10      albertel   58:   my $bodytext=&Apache::lonxml::get_all_text("/tex",$$parser[$#$parser]);
1.19      albertel   59:   if ($target eq 'tex') {
1.102     sakharuk   60:       return $bodytext.' ';
1.19      albertel   61:   }
1.10      albertel   62:   return '';
                     63: }
                     64: 
                     65: sub end_tex {
1.44      ng         66:     return '';
1.9       albertel   67: }
                     68: 
1.48      albertel   69: sub page_start {
                     70:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.79      albertel   71:   my %found;
                     72:   foreach my $taginside ($tagstack) {
                     73:     foreach my $taglookedfor ('html','body','form') {
                     74:       if ($taginside =~ /^$taglookedfor$/i) { $found{$taglookedfor} = 1; }
                     75:     }
                     76:   }
                     77: 
                     78:   my $result;
                     79:   my $head_tag_start;
                     80:   if (!defined($found{'html'})) {
                     81:     $result=&Apache::londefdef::start_html($target,$token,$tagstack,$parstack,
                     82: 					   $parser,$safeeval);
1.84      matthew    83:     $head_tag_start='<head>'.&Apache::lonxml::registerurl(undef,$target);
1.79      albertel   84:   }
                     85:   my $body_tag_start;
                     86:   if (!defined($found{'body'})) {
1.80      albertel   87:     $body_tag_start='<body onLoad="'.&Apache::lonxml::loadevents().'" '.
1.79      albertel   88:       'onUnload="'.&Apache::lonxml::unloadevents().'" ';
                     89:     my $background=&Apache::lonxml::get_param('background',$parstack,$safeeval);
                     90:     if ($background) {
                     91:       $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=
                     92: 	$background;
                     93:       $body_tag_start.='background="'.$background.'" ';
1.50      albertel   94:     } else {
1.79      albertel   95:       my $bgcolor=&Apache::lonxml::get_param('bgcolor',$parstack,$safeeval);
                     96:       if ($bgcolor) {
                     97: 	$body_tag_start.='bgcolor="'.$bgcolor.'" ';
                     98:       } else {
                     99: 	$body_tag_start.='bgcolor="#ffffff"';
                    100:       }
1.50      albertel  101:     }
1.79      albertel  102:     $body_tag_start.='>';
1.50      albertel  103:   }
1.105     albertel  104:   my $form_tag_start;
                    105:   if (!defined($found{'form'})) {
                    106:     $form_tag_start='<form name="lonhomework" method="POST" action="'.
                    107:       $ENV{'request.uri'}.'">';
                    108:   }
                    109:   return ($result,$head_tag_start,$body_tag_start,$form_tag_start);
                    110: }
                    111: 
                    112: sub get_resource_name {
                    113:   my ($parstack,$safeeval)=@_;
                    114:   my $name=&Apache::lonxml::get_param('name',$parstack,$safeeval);
                    115:   if ($name eq '') { 
                    116:     $name=&Apache::lonnet::EXT('resource.title');
                    117:     if ($name eq 'con_lost') { $name = ''; }
                    118:   }
                    119:   $Apache::lonhomework::name=$name;
                    120:   return $name;
                    121: }
                    122: 
                    123: sub setup_rndseed {
                    124:   my ($safeeval)=@_;
                    125:   my $rndseed;
                    126:   if ($ENV{'request.state'} eq "construct") {
                    127:     $rndseed=$ENV{'form.rndseed'};
                    128:     if (!$rndseed) {
                    129:       $rndseed=time;
                    130:       $ENV{'form.rndseed'}=$rndseed;
                    131:     }
                    132:     &Apache::run::run('$external::randomseed='.$rndseed.';',$safeeval);
                    133:   }
                    134:   return $rndseed;
                    135: }
                    136: 
                    137: sub problem_edit_header {
                    138:   return '<input type="hidden" name="submitted" value="edit" />
                    139:        <input type="hidden" name="problemmode" value="Edit" />
                    140:        <input type="submit" name="problemmode" value="Discard Edits and View" />
                    141:        <input type="submit" name="problemmode" value="EditXML" />
                    142:        <input type="submit" name="Undo" value="undo" /> <hr />
                    143:        <input type="submit" name="submit" value="Submit Changes" />
                    144:        <input type="submit" name="submit" value="Submit Changes and View" /><br />
                    145:       ';
                    146: }
                    147: 
                    148: sub problem_edit_footer {
                    149:   return '<br /><input type="submit" name="submit" value="Submit Changes and Edit" />
                    150:     <input type="submit" name="submit" value="Submit Changes and View" />';
                    151: }
                    152: 
                    153: sub problem_web_to_edit_header {
                    154:   my ($rndseed)=@_;
                    155:   my $result.='<input type="hidden" name="problemmode" value="View" />
                    156:              <input type="submit" name="problemmode" value="Edit" />
                    157:              <input type="submit" name="problemmode" value="EditXML" />
                    158:              Random Seed:<input type="text" name="rndseed" width="10" value="'.
                    159: 	       $rndseed.'" />
                    160:              <input type="submit" name="changerandseed" value="Change" />
                    161:              <input type="submit" name="resetdata" value="Reset Submissions" />
                    162:              <input type="checkbox" name="showallfoils" ';
                    163:   if (defined($ENV{'form.showallfoils'})) { $result.='checked="on"'; }
1.115     albertel  164:   $result.= ' />&nbsp;Show&nbsp;All&nbsp;Foils
1.105     albertel  165:              <hr />';
1.126     albertel  166:   my $numtoanalyze=$ENV{'form.numtoanalyze'};
                    167:   if (!$numtoanalyze) { $numtoanalyze=100; }
                    168:   #DISABLED for now.
                    169:   #$result.= '<input type="submit" name="problemmode" value="Answer Distribution" />
                    170: #             <input type="text" name="numtoanalyze" value="'.
                    171: #		 $numtoanalyze.'" size="5" /> <hr />';
1.48      albertel  172: }
                    173: 
1.65      albertel  174: sub initialize_storage {
                    175:   %Apache::lonhomework::results=();
1.66      albertel  176:   my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
1.67      albertel  177:   if ($ENV{'request.state'} eq 'construct') {
                    178:     %Apache::lonhomework::history=
1.72      albertel  179:       &Apache::lonnet::tmprestore($ENV{'request.uri'},'',$domain,$name);
1.67      albertel  180:     my ($temp)=keys %Apache::lonhomework::history ;
                    181:     &Apache::lonxml::debug("Return message of $temp");
                    182:   } else {
                    183:     %Apache::lonhomework::history=
                    184:       &Apache::lonnet::restore($symb,$courseid,$domain,$name);
                    185:   }
1.65      albertel  186:   #ignore error conditions
                    187:   my ($temp)=keys %Apache::lonhomework::history ;
                    188:   if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }
                    189: }
                    190: 
                    191: # -------------------------------------------------------------finalize_storage
                    192: # Stores away the result has to a student's environment
                    193: # checks form.grade_ for specific values, other wises stores
                    194: # to the running users environment
                    195: sub finalize_storage {
                    196:   my $result;
                    197:   my ($temp) = keys %Apache::lonhomework::results;
                    198:   if ( $temp ne '' ) {
1.66      albertel  199:     my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
1.67      albertel  200:     if ($ENV{'request.state'} eq 'construct') {
1.72      albertel  201:       $result=&Apache::lonnet::tmpstore(\%Apache::lonhomework::results,
                    202: 				      $ENV{'request.uri'},'',$domain,$name);
1.67      albertel  203:       &Apache::lonxml::debug('Construct Store return message:'.$result);
                    204:     } else {
                    205:       $result=&Apache::lonnet::cstore(\%Apache::lonhomework::results,
                    206: 				      $symb,$courseid,$domain,$name);
                    207:       &Apache::lonxml::debug('Store return message:'.$result);
                    208:     }
1.65      albertel  209:   }
                    210:   return $result;
                    211: }
                    212: 
                    213: sub checkout_msg {
                    214: return (<<ENDCHECKOUT);
                    215: <h2>The resource needs to be checked out</h2>
                    216: As a resource gets checked out, a unique timestamped ID is given to it, and a
                    217: permanent record is left in the system.<p />
                    218: <font color=red>
                    219: Checking out resources is subject to course policies, and may exclude future
                    220: credit even if done erroneously.<p />
1.91      albertel  221: </font>
                    222: <form name="checkout" method="POST" action="$ENV{'request.uri'}">
                    223: <input type="hidden" name="doescheckout" value="yes" />
                    224: <input type="button" name="checkoutbutton" value="Check out Exam for Viewing" onClick="javascript:if (confirm('Check out Exam?')) { document.checkout.submit(); }" />
1.65      albertel  225: </form>
                    226: ENDCHECKOUT
                    227: }
                    228: 
1.9       albertel  229: sub start_problem {
1.40      albertel  230:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.19      albertel  231: 
1.81      albertel  232:   # meta is called from lonpublisher, which doesn't uses the normal
                    233:   # lonhomework method of parsing the file which means that inputtags 
                    234:   # won't get reset
                    235:   if ( $Apache::inputtags::part ne '' && $target != 'meta' ) {
1.79      albertel  236:     &Apache::lonxml::error('Only one problem allowed in a .problem file');
                    237:     my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[-1]);
                    238:     return '';
                    239:   }
1.19      albertel  240: #intialize globals
                    241:   $Apache::inputtags::part='0';
                    242:   @Apache::inputtags::responselist = ();
1.51      albertel  243:   @Apache::inputtags::previous=();
1.87      albertel  244:   if ($target ne 'analyze') {
                    245:     &initialize_storage();
                    246:     if ($target eq 'web') {
                    247:       &Apache::lonhomework::showhash(%Apache::lonhomework::history);
                    248:     }
                    249:     $Apache::lonhomework::type=&Apache::lonnet::EXT('resource.0.type');
                    250:     &Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");
1.73      albertel  251:   }
1.42      albertel  252:   if ($Apache::lonhomework::type eq '') {
1.53      albertel  253:     my $uri=$ENV{'request.uri'};
                    254:     if ($uri=~/\.(\w+)$/) {
                    255:       $Apache::lonhomework::type=$1;
                    256:       &Apache::lonxml::debug("Using type of $1");
                    257:     } else {
                    258:       $Apache::lonhomework::type='problem';
                    259:       &Apache::lonxml::debug("Using default type, problem, :$uri:");
                    260:     }
1.42      albertel  261:   }
1.58      www       262: 
1.67      albertel  263:   #added vars to the scripting enviroment
1.19      albertel  264:   my $expression='$external::part='.$Apache::inputtags::part.';';
                    265:   &Apache::run::run($expression,$safeeval);
1.22      albertel  266:   my $status;
1.55      www       267:   my $accessmsg;
1.36      albertel  268: 
1.41      albertel  269:   #should get back a <html> or the neccesary stuff to start XML/MathML
1.105     albertel  270:   my ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
1.48      albertel  271:     &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
1.96      sakharuk  272:   if ($target eq 'tex' and $ENV{'request.symb'} =~ m/\.page_/) { $result = '';}
1.67      albertel  273: 
1.98      sakharuk  274:   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
1.67      albertel  275:     #handle exam checkout
                    276:     if ($Apache::lonhomework::type eq 'exam') {
                    277:       my $token=$Apache::lonhomework::history{"resource.0.outtoken"};
                    278:       if (($ENV{'form.doescheckout'}) && (!$token)) {
                    279: 	$token=&Apache::lonxml::maketoken();
                    280: 	$Apache::lonhomework::history{"resource.0.outtoken"}=$token;
                    281:       }
                    282:       $body_tag_start.=&Apache::lonxml::printtokenheader($target,$token);
                    283:     }
                    284: 
                    285:     #handle rand seed in construction space
1.105     albertel  286:     my $rndseed=&setup_rndseed($safeeval);
1.55      www       287:     ($status,$accessmsg) = &Apache::lonhomework::check_access('0');
1.22      albertel  288:     push (@Apache::inputtags::status,$status);
1.24      albertel  289:     my $expression='$external::datestatus="'.$status.'";';
                    290:     $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
                    291:     &Apache::run::run($expression,$safeeval);
1.54      www       292:     if (( $status eq 'CLOSED' ) ||
                    293:         ( $status eq 'UNCHECKEDOUT') ||
                    294:         ( $status eq 'BANNED')) {
1.21      albertel  295:       my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[$#$parser]);
                    296:       if ( $target eq "web" ) {
1.41      albertel  297: 	$result.= $head_tag_start.'</head>';
1.54      www       298:         my $msg=$body_tag_start.
                    299: 	    '<h1>Not open to be viewed</h1>';
                    300:         if ($status eq 'CLOSED') {
1.55      www       301: 	    $msg.='The problem '.$accessmsg;
1.54      www       302: 	} elsif ($status eq 'UNCHECKEDOUT') {
1.65      albertel  303:             $msg.=&checkout_msg;
1.54      www       304:         }
1.67      albertel  305: 	$result.=$msg.'<br />';
1.117     sakharuk  306:       } elsif ($target eq 'tex') {
                    307: 	  $result.="\\begin{document}\\noindent \\vskip 1 mm \\begin{minipage}{\\textwidth}\\vskip 0 mm Problem is not open to be viewed. It $accessmsg \\vskip 0 mm ";
                    308:       } 
1.67      albertel  309:     } elsif ($target eq 'web') {
1.105     albertel  310:       my $name= &get_resource_name($parstack,$safeeval);
1.67      albertel  311:       if ($status eq 'CAN_ANSWER') {
                    312: 	# create a page header and exit
1.105     albertel  313: 	$result.="$head_tag_start<title>$name</title></head>
                    314:               $body_tag_start \n $form_tag_start".	
1.36      albertel  315: 		'<input type="hidden" name="submitted" value="yes" />';
1.67      albertel  316: 	if ($ENV{'request.state'} eq "construct") {
1.105     albertel  317: 	  $result.= &problem_web_to_edit_header($rndseed);
1.67      albertel  318: 	}
                    319: 	# if we are viewing someone else preserve that info
                    320: 	if (defined $ENV{'form.grade_symb'}) {
                    321: 	  foreach my $field ('symb','courseid','domain','username') {
                    322: 	    $result .= '<input type="hidden" name="grade_'.$field.
                    323: 	      '" value="'.$ENV{"form.grade_$field"}.'" />'."\n";
                    324: 	  }
1.65      albertel  325: 	}
1.67      albertel  326:       } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER'
                    327: 	       || $status eq 'CLOSED') {
                    328: 	$result.=$head_tag_start.
                    329: 	  "<title>$name</title></head>\n$body_tag_start\n";
1.65      albertel  330:       }
1.99      sakharuk  331:     } elsif ($target eq 'tex') {
1.103     sakharuk  332: 	my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);
                    333: 	if ($name eq '') { 
                    334: 	    $name=&Apache::lonnet::EXT('resource.title');
                    335: 	    if ($name eq 'con_lost') { $name = ''; }
                    336: 	}
                    337: 	$Apache::lonhomework::name=$name;
1.99      sakharuk  338: 	my $id = $Apache::inputtags::part;
                    339: 	my $duedate = &Apache::lonnet::EXT("resource.$id.duedate"); 
                    340: 	$duedate = POSIX::strftime("%c",localtime($duedate));
1.101     sakharuk  341: 	my $temp_file;
                    342: 	my $filename = "/home/httpd/prtspool/$ENV{'user.name'}_$ENV{'user.domain'}_printout.due";
                    343:         if (-e $filename) {
                    344: 	    $temp_file = Apache::File->new($filename); 
1.99      sakharuk  345: 	} else {
1.101     sakharuk  346: 	    $temp_file = Apache::File->new('>>'.$filename); 
                    347: 	}
                    348: 	my @due_file_content = <$temp_file>;
                    349: 	my $due_file_content = $due_file_content[$#due_file_content];
                    350:         chomp $due_file_content;
                    351:         if ($due_file_content ne $duedate) {	    
                    352: 	$temp_file = Apache::File->new('>'.$filename); 
1.104     sakharuk  353: 	    print $temp_file "$duedate\n";	    
1.101     sakharuk  354: 	    if (not $ENV{'request.symb'} =~ m/\.page_/) {
1.104     sakharuk  355: 		if(not $duedate=~m/1969/) {
1.119     sakharuk  356: 		    $result .= '\begin{document} \noindent\textit{Due date: '.$duedate.'} \vskip 1 mm\noindent \begin{minipage}{\textwidth}';	
1.104     sakharuk  357: 		} else {
1.120     sakharuk  358: 		    $result .= '\begin{document} \noindent \vskip 1 mm \noindent\begin{minipage}{\textwidth}';
1.104     sakharuk  359: 		}
1.101     sakharuk  360: 	    } else {
1.117     sakharuk  361: 		$result .= '\vskip 1mm\textit{Due date: '.$duedate.'} \\\\\\\\';
1.101     sakharuk  362: 	    } 
                    363: 	} else {
                    364: 	    if (not $ENV{'request.symb'} =~ m/\.page_/) {
1.119     sakharuk  365: 		$result .= '\begin{document} \noindent \vskip 1 mm\noindent\begin{minipage}{\textwidth}';	
1.101     sakharuk  366: 	    } else {
1.117     sakharuk  367: 		$result .= '\vskip 1mm \\\\\\\\';
1.101     sakharuk  368: 	    } 
1.99      sakharuk  369: 	}
                    370:     }
1.67      albertel  371:   } elsif ($target eq 'edit') {
1.105     albertel  372:     $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
                    373:       &problem_edit_header();
1.39      albertel  374:     my $temp=&Apache::edit::insertlist($target,$token);
1.36      albertel  375:     $result.=$temp;
1.67      albertel  376:   } elsif ($target eq 'modified') {
1.37      albertel  377:     $result=$token->[4];
                    378:     $result.=&Apache::edit::handle_insert();
1.67      albertel  379:   } else {
                    380:     # page_start returned a starting result, delete it if we don't need it
                    381:     $result = '';
1.37      albertel  382:   }
1.67      albertel  383:   return $result;
1.9       albertel  384: }
                    385: 
                    386: sub end_problem {
1.40      albertel  387:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.16      albertel  388:   my $result='';
1.24      albertel  389:   my $status=$Apache::inputtags::status['-1'];
1.106     sakharuk  390:   if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' || $target eq 'tex') {
1.83      albertel  391:     if ( $target eq 'grade' && $Apache::inputtags::part eq '0') {
1.19      albertel  392:       # if part is zero, no <part>s existed, so we need to the grading
                    393:       &Apache::inputtags::grade;
1.106     sakharuk  394:     } elsif ( ($target eq 'web' || $target eq 'tex') && $Apache::inputtags::part eq '0' && 
1.91      albertel  395: 	      $status ne 'UNCHECKEDOUT') {
1.19      albertel  396:       # if part is zero, no <part>s existed, so we need show the current 
                    397:       # grading status
1.122     sakharuk  398:       my $gradestatus = &Apache::inputtags::gradestatus($Apache::inputtags::part,$target);
1.119     sakharuk  399:       if ($Apache::lonhomework::type ne 'exam') {$result.= $gradestatus;}
1.41      albertel  400:     }
1.68      albertel  401:     if (
1.112     albertel  402: 	(($target eq 'web') && ($ENV{'request.state'} ne 'construct')) ||
                    403: 	($target eq 'answer') || ($target eq 'tex')
1.68      albertel  404:        ) {
1.22      albertel  405:       if ($status eq 'CAN_ANSWER') {
1.106     sakharuk  406: 	  if ($target ne 'tex') {
                    407: 	      $result.="</form></body>\n";
                    408: 	  } 
1.91      albertel  409:       } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' ||
                    410: 	       $status eq 'UNCHECKEDOUT' ) {
1.106     sakharuk  411: 	  if ($target ne 'tex') {
                    412: 	      $result.="</body>\n";
                    413: 	  }
                    414:       }
                    415:       if ($target ne 'tex') {
                    416: 	  $result.=&Apache::lonxml::xmlend();
                    417:       } else {
                    418: 	      $result .= '\vskip 0.5mm\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}';
                    419: 	      if (not $ENV{'request.symb'} =~ m/\.page_/) {
1.117     sakharuk  420: 		  $result .= '\end{minipage}\end{document} ';
1.106     sakharuk  421: 	      } else {
1.117     sakharuk  422: 		  $result .= '';
1.106     sakharuk  423: 	      }
1.41      albertel  424:       }
1.22      albertel  425:     }
1.65      albertel  426:     if ($target eq 'grade') { 
                    427:       &Apache::lonhomework::showhash(%Apache::lonhomework::results);
                    428:       &finalize_storage();
                    429:     }
                    430:   } elsif ($target eq 'meta') {
1.18      albertel  431:     if ($Apache::inputtags::part eq '0') {
1.16      albertel  432:       $result=&Apache::response::mandatory_part_meta;
                    433:     }
1.65      albertel  434:   } elsif ($target eq 'edit') {
1.34      albertel  435:     &Apache::lonxml::debug("in end_problem with $target, edit");
1.105     albertel  436:     $result = &problem_edit_footer();
1.106     sakharuk  437:   } 
1.48      albertel  438:   return $result;
                    439: }
                    440: 
1.108     albertel  441: 
1.48      albertel  442: sub start_library {
                    443:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.109     albertel  444:   my ($result,$head_tag_start,$body_tag_start,$form_tag_start);
                    445: 
1.48      albertel  446:   if ($target eq 'edit') {
1.109     albertel  447:     ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
                    448:       &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
1.105     albertel  449:     $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
                    450:       &problem_edit_header();
1.48      albertel  451:     my $temp=&Apache::edit::insertlist($target,$token);
                    452:     $result.=$temp;
1.105     albertel  453:   } elsif ($target eq 'modified') {
1.48      albertel  454:     $result=$token->[4];
                    455:     $result.=&Apache::edit::handle_insert();
1.110     albertel  456:   } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
                    457: 	   $ENV{'request.state'} eq "construct" ) {
1.109     albertel  458:     ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
                    459:       &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
1.105     albertel  460:     my $name=&get_resource_name($parstack,$safeeval);
                    461:     my $rndseed=&setup_rndseed($safeeval);
                    462:     $result.="$head_tag_start<title>$name</title></head>
                    463:               $body_tag_start \n $form_tag_start".	
                    464: 		'<input type="hidden" name="submitted" value="yes" />';
                    465:     $result.=&problem_web_to_edit_header($rndseed);
1.48      albertel  466:   }
1.105     albertel  467:   return $result;
1.48      albertel  468: }
                    469: 
                    470: sub end_library {
                    471:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                    472:   my $result='';
                    473:   if ($target eq 'edit') {
1.105     albertel  474:     $result=&problem_edit_footer();
1.114     albertel  475:   } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
                    476: 	   $ENV{'request.state'} eq "construct") {
1.105     albertel  477:     $result.='</form></body>'.&Apache::lonxml::xmlend();
1.34      albertel  478:   }
1.16      albertel  479:   return $result;
1.1       albertel  480: }
                    481: 
                    482: sub start_block {
1.40      albertel  483:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.1       albertel  484: 
1.127   ! matthew   485:   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex' || $target eq 'analyze') {
1.38      albertel  486:     my $code = @$parstack[$#$parstack];
                    487:     $code =~ s/\"//g;
                    488:     $code .=';return $condition;';
                    489:     #  print "<br />$code<br />";
                    490:     my $result = &Apache::run::run($code,$safeeval);
                    491:     &Apache::lonxml::debug("block :$code: returned :$result:");
                    492:     if ( ! $result ) { 
                    493:       my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);
                    494:       &Apache::lonxml::debug("skipping ahead :$skip: $$parser[$#$parser]");
                    495:     }
1.1       albertel  496:   }
                    497:   return "";
                    498: }
                    499: 
                    500: sub end_block {
1.38      albertel  501:   return '';
1.4       tsai      502: }
                    503: 
                    504: sub start_while {
1.40      albertel  505:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.4       tsai      506: 
                    507:   my $code = @$parstack[$#$parstack];
                    508:   $code =~ s/\"//g;
                    509:   $code .=';return $condition;';
                    510: 
1.5       tsai      511:   push( @Apache::structuretags::whileconds, $code); 
1.4       tsai      512:   my $result = &Apache::run::run($code,$safeeval);
                    513:   my $bodytext=$$parser[$#$parser]->get_text("/while");
1.5       tsai      514:   push( @Apache::structuretags::whilebody, $bodytext);
                    515:   if ( $result ) { 
1.8       albertel  516:     &Apache::lonxml::newparser($parser,\$bodytext);
1.4       tsai      517:   }
                    518:   return "";
                    519: }
                    520: 
                    521: sub end_while {
1.40      albertel  522:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.5       tsai      523:   my $code = pop @Apache::structuretags::whileconds;
                    524:   my $bodytext = pop @Apache::structuretags::whilebody;
                    525:   my $result = &Apache::run::run($code,$safeeval);
                    526:   if ( $result ) { 
1.8       albertel  527:     &Apache::lonxml::newparser($parser,\$bodytext);
1.5       tsai      528:   } 
                    529:   return "";
1.1       albertel  530: }
1.6       tsai      531: 
1.110     albertel  532: # <randomlist show="1"> 
1.6       tsai      533: #  <tag1>..</tag1>
                    534: #  <tag2>..</tag2>
                    535: #  <tag3>..</tag3>
                    536: #  ... 
                    537: # </randomlist>
                    538: sub start_randomlist {
1.40      albertel  539:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.86      albertel  540:   my $result;
1.111     albertel  541:   if ($target eq 'answer' || $target eq 'grade' || $target eq 'web' ||
1.126     albertel  542:       $target eq 'tex' || $target eq 'analyze') {
1.71      albertel  543:     my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);
                    544:     my $b_parser= HTML::TokeParser->new(\$body);
                    545:     my $b_tok;
                    546:     my @randomlist;
                    547:     my $list_item;
                    548:     while($b_tok = $b_parser->get_token() ) {
                    549:       if($b_tok->[0] eq 'S') { # start tag
                    550: 	# get content of the tag until matching end tag
                    551: 	# get all text upto the matching tag
                    552: 	# and push the content into @randomlist
                    553: 	$list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
                    554: 	$list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
                    555: 	push(@randomlist,$list_item);
                    556: 	#  print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4], $list_item</b>";
                    557:       }
                    558:       if($b_tok->[0] eq 'T') { # text
                    559: 	# what to do with text in between tags?
                    560: 	#  print "<b>TEXT $b_tok->[1]</b><br />";
                    561:       }
                    562:       # if($b_tok->[0] eq 'E') { # end tag, should not happen
                    563:       #  print "<b>END-TAG $b_tok->[1]</b><br />";
                    564:       # }
                    565:     }
                    566:     my @idx_arr = (0 .. $#randomlist);
                    567:     &Apache::structuretags::shuffle(\@idx_arr);
                    568:     my $bodytext = '';
1.86      albertel  569:     my $show=$#randomlist;
                    570:     my $showarg=&Apache::lonxml::get_param('show',$parstack,$safeeval);
                    571:     $showarg--;
                    572:     if ( ($showarg >= 0) && ($showarg < $show) ) { $show = $showarg; }
                    573:     for(0 .. $show) {
1.71      albertel  574:       $bodytext .= "$randomlist[ $idx_arr[$_] ]";
1.6       tsai      575:     }
1.71      albertel  576:     &Apache::lonxml::newparser($parser,\$bodytext);
1.86      albertel  577:   } elsif ($target eq 'edit' ) {
                    578:     $result .= &Apache::edit::tag_start($target,$token);
                    579:     $result .= &Apache::edit::text_arg('Maximum Tags to Show:','show',$token,5);
                    580:     $result .= &Apache::edit::end_row().&Apache::edit::start_spanning_row();
                    581:   } elsif ($target eq 'modified' ) {
                    582:     my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,
                    583: 						 'show');
                    584:     if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
1.7       tsai      585:   }
1.86      albertel  586:   return $result;
1.7       tsai      587: }
                    588: 
                    589: sub shuffle {
                    590:     my $a=shift;
                    591:     my $i;
1.70      albertel  592:     if (defined(@$a)) {
                    593:       &Apache::response::setrandomnumber();
                    594:       for($i=@$a;--$i;) {
1.118     albertel  595: 	my $j=int(&Math::Random::random_uniform() * ($i+1));
1.70      albertel  596: 	next if $i == $j;
                    597: 	@$a[$i,$j] = @$a[$j,$i];
                    598:       }
1.7       tsai      599:     }
1.6       tsai      600: }
                    601: 
                    602: sub end_randomlist {
1.86      albertel  603:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                    604:   my $result;
                    605:   if ($target eq 'edit' ) {
                    606:     $result=&Apache::edit::tag_end($target,$token,'End Randomly Parsed Block');
                    607:   }
                    608:   return $result;
1.6       tsai      609: }
                    610: 
1.11      albertel  611: sub start_part {
1.40      albertel  612:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.95      albertel  613:   my $result='';
1.39      albertel  614:   my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
1.47      albertel  615:   if ($id eq '') { $id = $Apache::lonxml::curdepth; }
1.14      albertel  616:   $Apache::inputtags::part=$id;
1.18      albertel  617:   @Apache::inputtags::responselist = ();
1.51      albertel  618:   @Apache::inputtags::previous=();
1.15      www       619:   if ($target eq 'meta') {
1.16      albertel  620:     return &Apache::response::mandatory_part_meta;
1.95      albertel  621:   } elsif ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
1.55      www       622:     my ($status,$accessmsg) = &Apache::lonhomework::check_access($id);
1.23      albertel  623:     push (@Apache::inputtags::status,$status);
                    624:     my $expression='$external::datestatus="'.$status.'";';
                    625:     $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
                    626:     &Apache::run::run($expression,$safeeval);
                    627:     if ( $status eq 'CLOSED' ) {
1.21      albertel  628:       my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);
                    629:       if ( $target eq "web" ) {
1.95      albertel  630: 	$result="<br />Part is not open to be viewed. It $accessmsg<br />";
                    631:       } elsif ( $target eq 'tex' ) {
1.124     sakharuk  632: 	$result="\\end{minipage}\\vskip 0 mm Part is not open to be viewed. It $accessmsg \\\\\\begin{minipage}{\\textwidth}";
1.95      albertel  633:       }
                    634:     } else {
                    635:       if ($target eq 'tex') {
1.125     sakharuk  636: 	$result='\noindent \end{minipage}\vskip 0 mm \noindent \begin{minipage}{\textwidth}\noindent';
1.21      albertel  637:       }
                    638:     }
1.15      www       639:   }
1.95      albertel  640:   return $result;
1.11      albertel  641: }
                    642: 
                    643: sub end_part {
1.40      albertel  644:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.18      albertel  645:   &Apache::lonxml::debug("in end_part $target ");
1.28      albertel  646:   my $status=$Apache::inputtags::status['-1'];
1.23      albertel  647:   pop @Apache::inputtags::status;
1.19      albertel  648:   if ( $target eq 'meta' ) { return ''; }
1.37      albertel  649:   if ( $target eq 'grade' && $status eq 'CAN_ANSWER') {
                    650:     return &Apache::inputtags::grade;
1.28      albertel  651:   }
1.108     albertel  652:   if ($target eq 'web' || $target eq 'tex' ) {
1.121     sakharuk  653:     my $gradestatus=&Apache::inputtags::gradestatus($Apache::inputtags::part,$target);
1.120     sakharuk  654:     if ($Apache::lonhomework::type eq 'exam') {$gradestatus='';}
1.108     albertel  655:     return $gradestatus;
1.37      albertel  656:   }
                    657:   return '';
1.11      albertel  658: }
1.1       albertel  659: 
1.25      albertel  660: sub start_preduedate {
1.40      albertel  661:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.113     albertel  662:   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
1.29      albertel  663:     if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
                    664: 	$Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' ) {
1.26      albertel  665:       &Apache::lonxml::get_all_text("/preduedate",$$parser[$#$parser]);
1.24      albertel  666:     }
                    667:   }
                    668:   return '';
                    669: }
                    670: 
1.25      albertel  671: sub end_preduedate {
1.24      albertel  672:   return '';
                    673: }
                    674: 
1.25      albertel  675: sub start_postanswerdate {
1.40      albertel  676:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.113     albertel  677:   if ($target eq 'web' || $target eq 'grade' || $target eq 'tex') {
1.24      albertel  678:     if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
1.26      albertel  679:       &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);
1.24      albertel  680:     }
1.104     sakharuk  681:   } elsif ($target eq 'tex') {
                    682:       return '\vskip 0 mm \noindent';
1.24      albertel  683:   }
                    684:   return '';
                    685: }
                    686: 
1.25      albertel  687: sub end_postanswerdate {
1.24      albertel  688:   return '';
                    689: }
                    690: 
1.25      albertel  691: sub start_notsolved {
1.40      albertel  692:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.113     albertel  693:   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
1.24      albertel  694:     my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
                    695:     &Apache::lonxml::debug("not solved has :$gradestatus:");
                    696:     if ($gradestatus =~ /^correct/) {
                    697:       &Apache::lonxml::debug("skipping");
1.26      albertel  698:       &Apache::lonxml::get_all_text("/notsolved",$$parser[$#$parser]);
1.24      albertel  699:     }
                    700:   }
                    701:   return '';
                    702: }
                    703: 
1.25      albertel  704: sub end_notsolved {
1.24      albertel  705:   return '';
                    706: }
                    707: 
                    708: sub start_solved {
1.40      albertel  709:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.113     albertel  710:   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
1.24      albertel  711:     my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
                    712:     if ($gradestatus !~ /^correct/) {
                    713:       &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);
                    714:     }
                    715:   }
                    716:   return '';
                    717: }
                    718: 
                    719: sub end_solved {
                    720:   return '';
                    721: }
1.34      albertel  722: 
                    723: sub start_startouttext {
1.40      albertel  724:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.35      albertel  725:   my @result=(''.'');
                    726:   if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
                    727:   return (@result);
1.34      albertel  728: }
                    729: sub end_startouttext {
1.40      albertel  730:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.34      albertel  731:   my $result='';
1.35      albertel  732:   my $text='';
                    733: 
1.34      albertel  734:   if ($target eq 'edit') {
1.70      albertel  735:     $text=&Apache::lonxml::get_all_text("endouttext",$$parser[-1]);
1.43      albertel  736:     $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
1.42      albertel  737: <td>Delete:".
                    738:   &Apache::edit::deletelist($target,$token)
1.82      albertel  739:     ."</td>
1.42      albertel  740: <td>".
                    741:   &Apache::edit::insertlist($target,$token).
1.82      albertel  742:     &Apache::edit::end_row().&Apache::edit::start_spanning_row()."\n".
1.116     albertel  743:       &Apache::edit::editfield($token->[1],$text,"",80,4);
1.35      albertel  744:   }
                    745:   if ($target eq 'modified') {
                    746:     $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
                    747:     $result='<startouttext />'.&Apache::edit::modifiedfield();
1.85      sakharuk  748:   }
                    749:   if ($target eq 'tex') {
                    750:       $result .= '\noindent ';
1.34      albertel  751:   }
                    752:   return $result;
                    753: }
                    754: sub start_endouttext {
1.40      albertel  755:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.34      albertel  756:   my $result='';
1.43      albertel  757:   if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
1.35      albertel  758:   if ($target eq "modified") { $result='<endouttext />'; }
1.34      albertel  759:   return $result;
                    760: }
                    761: sub end_endouttext {
1.40      albertel  762:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.35      albertel  763:   my @result=('','');
                    764:   if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
                    765:   return (@result);
1.34      albertel  766: }
1.45      albertel  767: sub delete_startouttext {
                    768:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                    769: #  my $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
                    770:   my $text=$$parser['-1']->get_text("/endouttext");
1.69      albertel  771:   my $ntoken=$$parser['-1']->get_token();
                    772:   &Apache::lonxml::debug("Deleting :$text: and :$ntoken->[0]:$ntoken->[1]:$ntoken->[2]: for startouttext");
                    773:   &Apache::lonxml::end_tag($tagstack,$parstack,$ntoken);
1.45      albertel  774:   # Deleting 2 parallel tag pairs, but we need the numbers later to look like 
                    775:   # they did the last time round
1.69      albertel  776:   &Apache::lonxml::increasedepth($ntoken);
                    777:   &Apache::lonxml::decreasedepth($ntoken);
1.45      albertel  778:   return 1;
                    779: }
1.34      albertel  780: 
1.1       albertel  781: 1;
                    782: __END__

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