Annotation of loncom/homework/structuretags.pm, revision 1.122

1.34      albertel    1: # The LearningOnline Network with CAPA 
                      2: # definition of tags that give a structure to a document
1.74      albertel    3: #
1.122   ! sakharuk    4: # $Id: structuretags.pm,v 1.121 2002/10/01 21:04:34 sakharuk 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:   $result.= ' />&nbsp;Show&nbsp;All&nbsp;Foils
1.105     albertel  165:              <hr />';
1.48      albertel  166: }
                    167: 
1.65      albertel  168: sub initialize_storage {
                    169:   %Apache::lonhomework::results=();
1.66      albertel  170:   my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
1.67      albertel  171:   if ($ENV{'request.state'} eq 'construct') {
                    172:     %Apache::lonhomework::history=
1.72      albertel  173:       &Apache::lonnet::tmprestore($ENV{'request.uri'},'',$domain,$name);
1.67      albertel  174:     my ($temp)=keys %Apache::lonhomework::history ;
                    175:     &Apache::lonxml::debug("Return message of $temp");
                    176:   } else {
                    177:     %Apache::lonhomework::history=
                    178:       &Apache::lonnet::restore($symb,$courseid,$domain,$name);
                    179:   }
1.65      albertel  180:   #ignore error conditions
                    181:   my ($temp)=keys %Apache::lonhomework::history ;
                    182:   if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }
                    183: }
                    184: 
                    185: # -------------------------------------------------------------finalize_storage
                    186: # Stores away the result has to a student's environment
                    187: # checks form.grade_ for specific values, other wises stores
                    188: # to the running users environment
                    189: sub finalize_storage {
                    190:   my $result;
                    191:   my ($temp) = keys %Apache::lonhomework::results;
                    192:   if ( $temp ne '' ) {
1.66      albertel  193:     my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
1.67      albertel  194:     if ($ENV{'request.state'} eq 'construct') {
1.72      albertel  195:       $result=&Apache::lonnet::tmpstore(\%Apache::lonhomework::results,
                    196: 				      $ENV{'request.uri'},'',$domain,$name);
1.67      albertel  197:       &Apache::lonxml::debug('Construct Store return message:'.$result);
                    198:     } else {
                    199:       $result=&Apache::lonnet::cstore(\%Apache::lonhomework::results,
                    200: 				      $symb,$courseid,$domain,$name);
                    201:       &Apache::lonxml::debug('Store return message:'.$result);
                    202:     }
1.65      albertel  203:   }
                    204:   return $result;
                    205: }
                    206: 
                    207: sub checkout_msg {
                    208: return (<<ENDCHECKOUT);
                    209: <h2>The resource needs to be checked out</h2>
                    210: As a resource gets checked out, a unique timestamped ID is given to it, and a
                    211: permanent record is left in the system.<p />
                    212: <font color=red>
                    213: Checking out resources is subject to course policies, and may exclude future
                    214: credit even if done erroneously.<p />
1.91      albertel  215: </font>
                    216: <form name="checkout" method="POST" action="$ENV{'request.uri'}">
                    217: <input type="hidden" name="doescheckout" value="yes" />
                    218: <input type="button" name="checkoutbutton" value="Check out Exam for Viewing" onClick="javascript:if (confirm('Check out Exam?')) { document.checkout.submit(); }" />
1.65      albertel  219: </form>
                    220: ENDCHECKOUT
                    221: }
                    222: 
1.9       albertel  223: sub start_problem {
1.40      albertel  224:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.19      albertel  225: 
1.81      albertel  226:   # meta is called from lonpublisher, which doesn't uses the normal
                    227:   # lonhomework method of parsing the file which means that inputtags 
                    228:   # won't get reset
                    229:   if ( $Apache::inputtags::part ne '' && $target != 'meta' ) {
1.79      albertel  230:     &Apache::lonxml::error('Only one problem allowed in a .problem file');
                    231:     my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[-1]);
                    232:     return '';
                    233:   }
1.19      albertel  234: #intialize globals
                    235:   $Apache::inputtags::part='0';
                    236:   @Apache::inputtags::responselist = ();
1.51      albertel  237:   @Apache::inputtags::previous=();
1.87      albertel  238:   if ($target ne 'analyze') {
                    239:     &initialize_storage();
                    240:     if ($target eq 'web') {
                    241:       &Apache::lonhomework::showhash(%Apache::lonhomework::history);
                    242:     }
                    243:     $Apache::lonhomework::type=&Apache::lonnet::EXT('resource.0.type');
                    244:     &Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");
1.73      albertel  245:   }
1.42      albertel  246:   if ($Apache::lonhomework::type eq '') {
1.53      albertel  247:     my $uri=$ENV{'request.uri'};
                    248:     if ($uri=~/\.(\w+)$/) {
                    249:       $Apache::lonhomework::type=$1;
                    250:       &Apache::lonxml::debug("Using type of $1");
                    251:     } else {
                    252:       $Apache::lonhomework::type='problem';
                    253:       &Apache::lonxml::debug("Using default type, problem, :$uri:");
                    254:     }
1.42      albertel  255:   }
1.58      www       256: 
1.67      albertel  257:   #added vars to the scripting enviroment
1.19      albertel  258:   my $expression='$external::part='.$Apache::inputtags::part.';';
                    259:   &Apache::run::run($expression,$safeeval);
1.22      albertel  260:   my $status;
1.55      www       261:   my $accessmsg;
1.36      albertel  262: 
1.41      albertel  263:   #should get back a <html> or the neccesary stuff to start XML/MathML
1.105     albertel  264:   my ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
1.48      albertel  265:     &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
1.96      sakharuk  266:   if ($target eq 'tex' and $ENV{'request.symb'} =~ m/\.page_/) { $result = '';}
1.67      albertel  267: 
1.98      sakharuk  268:   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
1.67      albertel  269:     #handle exam checkout
                    270:     if ($Apache::lonhomework::type eq 'exam') {
                    271:       my $token=$Apache::lonhomework::history{"resource.0.outtoken"};
                    272:       if (($ENV{'form.doescheckout'}) && (!$token)) {
                    273: 	$token=&Apache::lonxml::maketoken();
                    274: 	$Apache::lonhomework::history{"resource.0.outtoken"}=$token;
                    275:       }
                    276:       $body_tag_start.=&Apache::lonxml::printtokenheader($target,$token);
                    277:     }
                    278: 
                    279:     #handle rand seed in construction space
1.105     albertel  280:     my $rndseed=&setup_rndseed($safeeval);
1.55      www       281:     ($status,$accessmsg) = &Apache::lonhomework::check_access('0');
1.22      albertel  282:     push (@Apache::inputtags::status,$status);
1.24      albertel  283:     my $expression='$external::datestatus="'.$status.'";';
                    284:     $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
                    285:     &Apache::run::run($expression,$safeeval);
1.54      www       286:     if (( $status eq 'CLOSED' ) ||
                    287:         ( $status eq 'UNCHECKEDOUT') ||
                    288:         ( $status eq 'BANNED')) {
1.21      albertel  289:       my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[$#$parser]);
                    290:       if ( $target eq "web" ) {
1.41      albertel  291: 	$result.= $head_tag_start.'</head>';
1.54      www       292:         my $msg=$body_tag_start.
                    293: 	    '<h1>Not open to be viewed</h1>';
                    294:         if ($status eq 'CLOSED') {
1.55      www       295: 	    $msg.='The problem '.$accessmsg;
1.54      www       296: 	} elsif ($status eq 'UNCHECKEDOUT') {
1.65      albertel  297:             $msg.=&checkout_msg;
1.54      www       298:         }
1.67      albertel  299: 	$result.=$msg.'<br />';
1.117     sakharuk  300:       } elsif ($target eq 'tex') {
                    301: 	  $result.="\\begin{document}\\noindent \\vskip 1 mm \\begin{minipage}{\\textwidth}\\vskip 0 mm Problem is not open to be viewed. It $accessmsg \\vskip 0 mm ";
                    302:       } 
1.67      albertel  303:     } elsif ($target eq 'web') {
1.105     albertel  304:       my $name= &get_resource_name($parstack,$safeeval);
1.67      albertel  305:       if ($status eq 'CAN_ANSWER') {
                    306: 	# create a page header and exit
1.105     albertel  307: 	$result.="$head_tag_start<title>$name</title></head>
                    308:               $body_tag_start \n $form_tag_start".	
1.36      albertel  309: 		'<input type="hidden" name="submitted" value="yes" />';
1.67      albertel  310: 	if ($ENV{'request.state'} eq "construct") {
1.105     albertel  311: 	  $result.= &problem_web_to_edit_header($rndseed);
1.67      albertel  312: 	}
                    313: 	# if we are viewing someone else preserve that info
                    314: 	if (defined $ENV{'form.grade_symb'}) {
                    315: 	  foreach my $field ('symb','courseid','domain','username') {
                    316: 	    $result .= '<input type="hidden" name="grade_'.$field.
                    317: 	      '" value="'.$ENV{"form.grade_$field"}.'" />'."\n";
                    318: 	  }
1.65      albertel  319: 	}
1.67      albertel  320:       } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER'
                    321: 	       || $status eq 'CLOSED') {
                    322: 	$result.=$head_tag_start.
                    323: 	  "<title>$name</title></head>\n$body_tag_start\n";
1.65      albertel  324:       }
1.99      sakharuk  325:     } elsif ($target eq 'tex') {
1.103     sakharuk  326: 	my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);
                    327: 	if ($name eq '') { 
                    328: 	    $name=&Apache::lonnet::EXT('resource.title');
                    329: 	    if ($name eq 'con_lost') { $name = ''; }
                    330: 	}
                    331: 	$Apache::lonhomework::name=$name;
1.99      sakharuk  332: 	my $id = $Apache::inputtags::part;
                    333: 	my $duedate = &Apache::lonnet::EXT("resource.$id.duedate"); 
                    334: 	$duedate = POSIX::strftime("%c",localtime($duedate));
1.101     sakharuk  335: 	my $temp_file;
                    336: 	my $filename = "/home/httpd/prtspool/$ENV{'user.name'}_$ENV{'user.domain'}_printout.due";
                    337:         if (-e $filename) {
                    338: 	    $temp_file = Apache::File->new($filename); 
1.99      sakharuk  339: 	} else {
1.101     sakharuk  340: 	    $temp_file = Apache::File->new('>>'.$filename); 
                    341: 	}
                    342: 	my @due_file_content = <$temp_file>;
                    343: 	my $due_file_content = $due_file_content[$#due_file_content];
                    344:         chomp $due_file_content;
                    345:         if ($due_file_content ne $duedate) {	    
                    346: 	$temp_file = Apache::File->new('>'.$filename); 
1.104     sakharuk  347: 	    print $temp_file "$duedate\n";	    
1.101     sakharuk  348: 	    if (not $ENV{'request.symb'} =~ m/\.page_/) {
1.104     sakharuk  349: 		if(not $duedate=~m/1969/) {
1.119     sakharuk  350: 		    $result .= '\begin{document} \noindent\textit{Due date: '.$duedate.'} \vskip 1 mm\noindent \begin{minipage}{\textwidth}';	
1.104     sakharuk  351: 		} else {
1.120     sakharuk  352: 		    $result .= '\begin{document} \noindent \vskip 1 mm \noindent\begin{minipage}{\textwidth}';
1.104     sakharuk  353: 		}
1.101     sakharuk  354: 	    } else {
1.117     sakharuk  355: 		$result .= '\vskip 1mm\textit{Due date: '.$duedate.'} \\\\\\\\';
1.101     sakharuk  356: 	    } 
                    357: 	} else {
                    358: 	    if (not $ENV{'request.symb'} =~ m/\.page_/) {
1.119     sakharuk  359: 		$result .= '\begin{document} \noindent \vskip 1 mm\noindent\begin{minipage}{\textwidth}';	
1.101     sakharuk  360: 	    } else {
1.117     sakharuk  361: 		$result .= '\vskip 1mm \\\\\\\\';
1.101     sakharuk  362: 	    } 
1.99      sakharuk  363: 	}
                    364:     }
1.67      albertel  365:   } elsif ($target eq 'edit') {
1.105     albertel  366:     $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
                    367:       &problem_edit_header();
1.39      albertel  368:     my $temp=&Apache::edit::insertlist($target,$token);
1.36      albertel  369:     $result.=$temp;
1.67      albertel  370:   } elsif ($target eq 'modified') {
1.37      albertel  371:     $result=$token->[4];
                    372:     $result.=&Apache::edit::handle_insert();
1.67      albertel  373:   } else {
                    374:     # page_start returned a starting result, delete it if we don't need it
                    375:     $result = '';
1.37      albertel  376:   }
1.67      albertel  377:   return $result;
1.9       albertel  378: }
                    379: 
                    380: sub end_problem {
1.40      albertel  381:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.16      albertel  382:   my $result='';
1.24      albertel  383:   my $status=$Apache::inputtags::status['-1'];
1.106     sakharuk  384:   if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' || $target eq 'tex') {
1.83      albertel  385:     if ( $target eq 'grade' && $Apache::inputtags::part eq '0') {
1.19      albertel  386:       # if part is zero, no <part>s existed, so we need to the grading
                    387:       &Apache::inputtags::grade;
1.106     sakharuk  388:     } elsif ( ($target eq 'web' || $target eq 'tex') && $Apache::inputtags::part eq '0' && 
1.91      albertel  389: 	      $status ne 'UNCHECKEDOUT') {
1.19      albertel  390:       # if part is zero, no <part>s existed, so we need show the current 
                    391:       # grading status
1.122   ! sakharuk  392:       my $gradestatus = &Apache::inputtags::gradestatus($Apache::inputtags::part,$target);
1.119     sakharuk  393:       if ($Apache::lonhomework::type ne 'exam') {$result.= $gradestatus;}
1.41      albertel  394:     }
1.68      albertel  395:     if (
1.112     albertel  396: 	(($target eq 'web') && ($ENV{'request.state'} ne 'construct')) ||
                    397: 	($target eq 'answer') || ($target eq 'tex')
1.68      albertel  398:        ) {
1.22      albertel  399:       if ($status eq 'CAN_ANSWER') {
1.106     sakharuk  400: 	  if ($target ne 'tex') {
                    401: 	      $result.="</form></body>\n";
                    402: 	  } 
1.91      albertel  403:       } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' ||
                    404: 	       $status eq 'UNCHECKEDOUT' ) {
1.106     sakharuk  405: 	  if ($target ne 'tex') {
                    406: 	      $result.="</body>\n";
                    407: 	  }
                    408:       }
                    409:       if ($target ne 'tex') {
                    410: 	  $result.=&Apache::lonxml::xmlend();
                    411:       } else {
                    412: 	      $result .= '\vskip 0.5mm\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}';
                    413: 	      if (not $ENV{'request.symb'} =~ m/\.page_/) {
1.117     sakharuk  414: 		  $result .= '\end{minipage}\end{document} ';
1.106     sakharuk  415: 	      } else {
1.117     sakharuk  416: 		  $result .= '';
1.106     sakharuk  417: 	      }
1.41      albertel  418:       }
1.22      albertel  419:     }
1.65      albertel  420:     if ($target eq 'grade') { 
                    421:       &Apache::lonhomework::showhash(%Apache::lonhomework::results);
                    422:       &finalize_storage();
                    423:     }
                    424:   } elsif ($target eq 'meta') {
1.18      albertel  425:     if ($Apache::inputtags::part eq '0') {
1.16      albertel  426:       $result=&Apache::response::mandatory_part_meta;
                    427:     }
1.65      albertel  428:   } elsif ($target eq 'edit') {
1.34      albertel  429:     &Apache::lonxml::debug("in end_problem with $target, edit");
1.105     albertel  430:     $result = &problem_edit_footer();
1.106     sakharuk  431:   } 
1.48      albertel  432:   return $result;
                    433: }
                    434: 
1.108     albertel  435: 
1.48      albertel  436: sub start_library {
                    437:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.109     albertel  438:   my ($result,$head_tag_start,$body_tag_start,$form_tag_start);
                    439: 
1.48      albertel  440:   if ($target eq 'edit') {
1.109     albertel  441:     ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
                    442:       &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
1.105     albertel  443:     $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
                    444:       &problem_edit_header();
1.48      albertel  445:     my $temp=&Apache::edit::insertlist($target,$token);
                    446:     $result.=$temp;
1.105     albertel  447:   } elsif ($target eq 'modified') {
1.48      albertel  448:     $result=$token->[4];
                    449:     $result.=&Apache::edit::handle_insert();
1.110     albertel  450:   } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
                    451: 	   $ENV{'request.state'} eq "construct" ) {
1.109     albertel  452:     ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
                    453:       &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
1.105     albertel  454:     my $name=&get_resource_name($parstack,$safeeval);
                    455:     my $rndseed=&setup_rndseed($safeeval);
                    456:     $result.="$head_tag_start<title>$name</title></head>
                    457:               $body_tag_start \n $form_tag_start".	
                    458: 		'<input type="hidden" name="submitted" value="yes" />';
                    459:     $result.=&problem_web_to_edit_header($rndseed);
1.48      albertel  460:   }
1.105     albertel  461:   return $result;
1.48      albertel  462: }
                    463: 
                    464: sub end_library {
                    465:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                    466:   my $result='';
                    467:   if ($target eq 'edit') {
1.105     albertel  468:     $result=&problem_edit_footer();
1.114     albertel  469:   } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
                    470: 	   $ENV{'request.state'} eq "construct") {
1.105     albertel  471:     $result.='</form></body>'.&Apache::lonxml::xmlend();
1.34      albertel  472:   }
1.16      albertel  473:   return $result;
1.1       albertel  474: }
                    475: 
                    476: sub start_block {
1.40      albertel  477:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.1       albertel  478: 
1.113     albertel  479:   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
1.38      albertel  480:     my $code = @$parstack[$#$parstack];
                    481:     $code =~ s/\"//g;
                    482:     $code .=';return $condition;';
                    483:     #  print "<br />$code<br />";
                    484:     my $result = &Apache::run::run($code,$safeeval);
                    485:     &Apache::lonxml::debug("block :$code: returned :$result:");
                    486:     if ( ! $result ) { 
                    487:       my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);
                    488:       &Apache::lonxml::debug("skipping ahead :$skip: $$parser[$#$parser]");
                    489:     }
1.1       albertel  490:   }
                    491:   return "";
                    492: }
                    493: 
                    494: sub end_block {
1.38      albertel  495:   return '';
1.4       tsai      496: }
                    497: 
                    498: sub start_while {
1.40      albertel  499:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.4       tsai      500: 
                    501:   my $code = @$parstack[$#$parstack];
                    502:   $code =~ s/\"//g;
                    503:   $code .=';return $condition;';
                    504: 
1.5       tsai      505:   push( @Apache::structuretags::whileconds, $code); 
1.4       tsai      506:   my $result = &Apache::run::run($code,$safeeval);
                    507:   my $bodytext=$$parser[$#$parser]->get_text("/while");
1.5       tsai      508:   push( @Apache::structuretags::whilebody, $bodytext);
                    509:   if ( $result ) { 
1.8       albertel  510:     &Apache::lonxml::newparser($parser,\$bodytext);
1.4       tsai      511:   }
                    512:   return "";
                    513: }
                    514: 
                    515: sub end_while {
1.40      albertel  516:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.5       tsai      517:   my $code = pop @Apache::structuretags::whileconds;
                    518:   my $bodytext = pop @Apache::structuretags::whilebody;
                    519:   my $result = &Apache::run::run($code,$safeeval);
                    520:   if ( $result ) { 
1.8       albertel  521:     &Apache::lonxml::newparser($parser,\$bodytext);
1.5       tsai      522:   } 
                    523:   return "";
1.1       albertel  524: }
1.6       tsai      525: 
1.110     albertel  526: # <randomlist show="1"> 
1.6       tsai      527: #  <tag1>..</tag1>
                    528: #  <tag2>..</tag2>
                    529: #  <tag3>..</tag3>
                    530: #  ... 
                    531: # </randomlist>
                    532: sub start_randomlist {
1.40      albertel  533:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.86      albertel  534:   my $result;
1.111     albertel  535:   if ($target eq 'answer' || $target eq 'grade' || $target eq 'web' ||
                    536:       $target eq 'tex') {
1.71      albertel  537:     my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);
                    538:     my $b_parser= HTML::TokeParser->new(\$body);
                    539:     my $b_tok;
                    540:     my @randomlist;
                    541:     my $list_item;
                    542:     while($b_tok = $b_parser->get_token() ) {
                    543:       if($b_tok->[0] eq 'S') { # start tag
                    544: 	# get content of the tag until matching end tag
                    545: 	# get all text upto the matching tag
                    546: 	# and push the content into @randomlist
                    547: 	$list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
                    548: 	$list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
                    549: 	push(@randomlist,$list_item);
                    550: 	#  print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4], $list_item</b>";
                    551:       }
                    552:       if($b_tok->[0] eq 'T') { # text
                    553: 	# what to do with text in between tags?
                    554: 	#  print "<b>TEXT $b_tok->[1]</b><br />";
                    555:       }
                    556:       # if($b_tok->[0] eq 'E') { # end tag, should not happen
                    557:       #  print "<b>END-TAG $b_tok->[1]</b><br />";
                    558:       # }
                    559:     }
                    560:     my @idx_arr = (0 .. $#randomlist);
                    561:     &Apache::structuretags::shuffle(\@idx_arr);
                    562:     my $bodytext = '';
1.86      albertel  563:     my $show=$#randomlist;
                    564:     my $showarg=&Apache::lonxml::get_param('show',$parstack,$safeeval);
                    565:     $showarg--;
                    566:     if ( ($showarg >= 0) && ($showarg < $show) ) { $show = $showarg; }
                    567:     for(0 .. $show) {
1.71      albertel  568:       $bodytext .= "$randomlist[ $idx_arr[$_] ]";
1.6       tsai      569:     }
1.71      albertel  570:     &Apache::lonxml::newparser($parser,\$bodytext);
1.86      albertel  571:   } elsif ($target eq 'edit' ) {
                    572:     $result .= &Apache::edit::tag_start($target,$token);
                    573:     $result .= &Apache::edit::text_arg('Maximum Tags to Show:','show',$token,5);
                    574:     $result .= &Apache::edit::end_row().&Apache::edit::start_spanning_row();
                    575:   } elsif ($target eq 'modified' ) {
                    576:     my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,
                    577: 						 'show');
                    578:     if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
1.7       tsai      579:   }
1.86      albertel  580:   return $result;
1.7       tsai      581: }
                    582: 
                    583: sub shuffle {
                    584:     my $a=shift;
                    585:     my $i;
1.70      albertel  586:     if (defined(@$a)) {
                    587:       &Apache::response::setrandomnumber();
                    588:       for($i=@$a;--$i;) {
1.118     albertel  589: 	my $j=int(&Math::Random::random_uniform() * ($i+1));
1.70      albertel  590: 	next if $i == $j;
                    591: 	@$a[$i,$j] = @$a[$j,$i];
                    592:       }
1.7       tsai      593:     }
1.6       tsai      594: }
                    595: 
                    596: sub end_randomlist {
1.86      albertel  597:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                    598:   my $result;
                    599:   if ($target eq 'edit' ) {
                    600:     $result=&Apache::edit::tag_end($target,$token,'End Randomly Parsed Block');
                    601:   }
                    602:   return $result;
1.6       tsai      603: }
                    604: 
1.11      albertel  605: sub start_part {
1.40      albertel  606:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.95      albertel  607:   my $result='';
1.39      albertel  608:   my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
1.47      albertel  609:   if ($id eq '') { $id = $Apache::lonxml::curdepth; }
1.14      albertel  610:   $Apache::inputtags::part=$id;
1.18      albertel  611:   @Apache::inputtags::responselist = ();
1.51      albertel  612:   @Apache::inputtags::previous=();
1.15      www       613:   if ($target eq 'meta') {
1.16      albertel  614:     return &Apache::response::mandatory_part_meta;
1.95      albertel  615:   } elsif ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
1.55      www       616:     my ($status,$accessmsg) = &Apache::lonhomework::check_access($id);
1.23      albertel  617:     push (@Apache::inputtags::status,$status);
                    618:     my $expression='$external::datestatus="'.$status.'";';
                    619:     $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
                    620:     &Apache::run::run($expression,$safeeval);
                    621:     if ( $status eq 'CLOSED' ) {
1.21      albertel  622:       my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);
                    623:       if ( $target eq "web" ) {
1.95      albertel  624: 	$result="<br />Part is not open to be viewed. It $accessmsg<br />";
                    625:       } elsif ( $target eq 'tex' ) {
                    626: 	$result="\\vskip 0 mm Part is not open to be viewed. It $accessmsg \\\\";
                    627:       }
                    628:     } else {
                    629:       if ($target eq 'tex') {
                    630: 	$result='\vskip 0 mm';
1.21      albertel  631:       }
                    632:     }
1.15      www       633:   }
1.95      albertel  634:   return $result;
1.11      albertel  635: }
                    636: 
                    637: sub end_part {
1.40      albertel  638:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.18      albertel  639:   &Apache::lonxml::debug("in end_part $target ");
1.28      albertel  640:   my $status=$Apache::inputtags::status['-1'];
1.23      albertel  641:   pop @Apache::inputtags::status;
1.19      albertel  642:   if ( $target eq 'meta' ) { return ''; }
1.37      albertel  643:   if ( $target eq 'grade' && $status eq 'CAN_ANSWER') {
                    644:     return &Apache::inputtags::grade;
1.28      albertel  645:   }
1.108     albertel  646:   if ($target eq 'web' || $target eq 'tex' ) {
1.121     sakharuk  647:     my $gradestatus=&Apache::inputtags::gradestatus($Apache::inputtags::part,$target);
1.120     sakharuk  648:     if ($Apache::lonhomework::type eq 'exam') {$gradestatus='';}
1.108     albertel  649:     return $gradestatus;
1.37      albertel  650:   }
                    651:   return '';
1.11      albertel  652: }
1.1       albertel  653: 
1.25      albertel  654: sub start_preduedate {
1.40      albertel  655:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.113     albertel  656:   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
1.29      albertel  657:     if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
                    658: 	$Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' ) {
1.26      albertel  659:       &Apache::lonxml::get_all_text("/preduedate",$$parser[$#$parser]);
1.24      albertel  660:     }
                    661:   }
                    662:   return '';
                    663: }
                    664: 
1.25      albertel  665: sub end_preduedate {
1.24      albertel  666:   return '';
                    667: }
                    668: 
1.25      albertel  669: sub start_postanswerdate {
1.40      albertel  670:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.113     albertel  671:   if ($target eq 'web' || $target eq 'grade' || $target eq 'tex') {
1.24      albertel  672:     if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
1.26      albertel  673:       &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);
1.24      albertel  674:     }
1.104     sakharuk  675:   } elsif ($target eq 'tex') {
                    676:       return '\vskip 0 mm \noindent';
1.24      albertel  677:   }
                    678:   return '';
                    679: }
                    680: 
1.25      albertel  681: sub end_postanswerdate {
1.24      albertel  682:   return '';
                    683: }
                    684: 
1.25      albertel  685: sub start_notsolved {
1.40      albertel  686:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.113     albertel  687:   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
1.24      albertel  688:     my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
                    689:     &Apache::lonxml::debug("not solved has :$gradestatus:");
                    690:     if ($gradestatus =~ /^correct/) {
                    691:       &Apache::lonxml::debug("skipping");
1.26      albertel  692:       &Apache::lonxml::get_all_text("/notsolved",$$parser[$#$parser]);
1.24      albertel  693:     }
                    694:   }
                    695:   return '';
                    696: }
                    697: 
1.25      albertel  698: sub end_notsolved {
1.24      albertel  699:   return '';
                    700: }
                    701: 
                    702: sub start_solved {
1.40      albertel  703:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.113     albertel  704:   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
1.24      albertel  705:     my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
                    706:     if ($gradestatus !~ /^correct/) {
                    707:       &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);
                    708:     }
                    709:   }
                    710:   return '';
                    711: }
                    712: 
                    713: sub end_solved {
                    714:   return '';
                    715: }
1.34      albertel  716: 
                    717: sub start_startouttext {
1.40      albertel  718:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.35      albertel  719:   my @result=(''.'');
                    720:   if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
                    721:   return (@result);
1.34      albertel  722: }
                    723: sub end_startouttext {
1.40      albertel  724:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.34      albertel  725:   my $result='';
1.35      albertel  726:   my $text='';
                    727: 
1.34      albertel  728:   if ($target eq 'edit') {
1.70      albertel  729:     $text=&Apache::lonxml::get_all_text("endouttext",$$parser[-1]);
1.43      albertel  730:     $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
1.42      albertel  731: <td>Delete:".
                    732:   &Apache::edit::deletelist($target,$token)
1.82      albertel  733:     ."</td>
1.42      albertel  734: <td>".
                    735:   &Apache::edit::insertlist($target,$token).
1.82      albertel  736:     &Apache::edit::end_row().&Apache::edit::start_spanning_row()."\n".
1.116     albertel  737:       &Apache::edit::editfield($token->[1],$text,"",80,4);
1.35      albertel  738:   }
                    739:   if ($target eq 'modified') {
                    740:     $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
                    741:     $result='<startouttext />'.&Apache::edit::modifiedfield();
1.85      sakharuk  742:   }
                    743:   if ($target eq 'tex') {
                    744:       $result .= '\noindent ';
1.34      albertel  745:   }
                    746:   return $result;
                    747: }
                    748: sub start_endouttext {
1.40      albertel  749:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.34      albertel  750:   my $result='';
1.43      albertel  751:   if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
1.35      albertel  752:   if ($target eq "modified") { $result='<endouttext />'; }
1.34      albertel  753:   return $result;
                    754: }
                    755: sub end_endouttext {
1.40      albertel  756:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.35      albertel  757:   my @result=('','');
                    758:   if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
                    759:   return (@result);
1.34      albertel  760: }
1.45      albertel  761: sub delete_startouttext {
                    762:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                    763: #  my $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
                    764:   my $text=$$parser['-1']->get_text("/endouttext");
1.69      albertel  765:   my $ntoken=$$parser['-1']->get_token();
                    766:   &Apache::lonxml::debug("Deleting :$text: and :$ntoken->[0]:$ntoken->[1]:$ntoken->[2]: for startouttext");
                    767:   &Apache::lonxml::end_tag($tagstack,$parstack,$ntoken);
1.45      albertel  768:   # Deleting 2 parallel tag pairs, but we need the numbers later to look like 
                    769:   # they did the last time round
1.69      albertel  770:   &Apache::lonxml::increasedepth($ntoken);
                    771:   &Apache::lonxml::decreasedepth($ntoken);
1.45      albertel  772:   return 1;
                    773: }
1.34      albertel  774: 
1.1       albertel  775: 1;
                    776: __END__

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