Annotation of loncom/homework/structuretags.pm, revision 1.82

1.34      albertel    1: # The LearningOnline Network with CAPA 
                      2: # definition of tags that give a structure to a document
1.74      albertel    3: #
1.82    ! albertel    4: # $Id: structuretags.pm,v 1.81 2002/02/08 20:58:39 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;
                     36: 
1.78      harris41   37: BEGIN {
1.48      albertel   38:   &Apache::lonxml::register('Apache::structuretags',('block','while','randomlist','problem','library','web','tex','part','preduedate','postanswerdate','solved','notsolved','startouttext','endouttext'));
1.37      albertel   39: #  &Apache::lonxml::register_insert('problem','',('part','postanswerdate','preduedate'))
1.10      albertel   40: }
                     41: 
                     42: sub start_web {
1.40      albertel   43:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.10      albertel   44:   my $bodytext=&Apache::lonxml::get_all_text("/web",$$parser[$#$parser]);
1.19      albertel   45:   if ($target eq 'web') {
                     46:     return $bodytext;
                     47:   } 
                     48:   return '';
1.10      albertel   49: }
                     50: 
                     51: sub end_web {
1.44      ng         52:     return '';
1.10      albertel   53: }
                     54: 
                     55: sub start_tex {
1.40      albertel   56:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.10      albertel   57:   my $bodytext=&Apache::lonxml::get_all_text("/tex",$$parser[$#$parser]);
1.19      albertel   58:   if ($target eq 'tex') {
                     59:     return $bodytext
                     60:   }
1.10      albertel   61:   return '';
                     62: }
                     63: 
                     64: sub end_tex {
1.44      ng         65:     return '';
1.9       albertel   66: }
                     67: 
1.48      albertel   68: sub page_start {
                     69:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.79      albertel   70:   my %found;
                     71:   foreach my $taginside ($tagstack) {
                     72:     foreach my $taglookedfor ('html','body','form') {
                     73:       if ($taginside =~ /^$taglookedfor$/i) { $found{$taglookedfor} = 1; }
                     74:     }
                     75:   }
                     76: 
                     77:   my $result;
                     78:   my $head_tag_start;
                     79:   if (!defined($found{'html'})) {
                     80:     $result=&Apache::londefdef::start_html($target,$token,$tagstack,$parstack,
                     81: 					   $parser,$safeeval);
                     82:     $head_tag_start='<head>'.&Apache::lonxml::registerurl();
                     83:   }
                     84:   my $body_tag_start;
                     85:   if (!defined($found{'body'})) {
1.80      albertel   86:     $body_tag_start='<body onLoad="'.&Apache::lonxml::loadevents().'" '.
1.79      albertel   87:       'onUnload="'.&Apache::lonxml::unloadevents().'" ';
                     88:     my $background=&Apache::lonxml::get_param('background',$parstack,$safeeval);
                     89:     if ($background) {
                     90:       $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=
                     91: 	$background;
                     92:       $body_tag_start.='background="'.$background.'" ';
1.50      albertel   93:     } else {
1.79      albertel   94:       my $bgcolor=&Apache::lonxml::get_param('bgcolor',$parstack,$safeeval);
                     95:       if ($bgcolor) {
                     96: 	$body_tag_start.='bgcolor="'.$bgcolor.'" ';
                     97:       } else {
                     98: 	$body_tag_start.='bgcolor="#ffffff"';
                     99:       }
1.50      albertel  100:     }
1.79      albertel  101:     $body_tag_start.='>';
1.50      albertel  102:   }
1.48      albertel  103:   return ($result,$head_tag_start,$body_tag_start);
                    104: }
                    105: 
1.65      albertel  106: sub initialize_storage {
                    107:   %Apache::lonhomework::results=();
1.66      albertel  108:   my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
1.67      albertel  109:   if ($ENV{'request.state'} eq 'construct') {
                    110:     %Apache::lonhomework::history=
1.72      albertel  111:       &Apache::lonnet::tmprestore($ENV{'request.uri'},'',$domain,$name);
1.67      albertel  112:     my ($temp)=keys %Apache::lonhomework::history ;
                    113:     &Apache::lonxml::debug("Return message of $temp");
                    114:   } else {
                    115:     %Apache::lonhomework::history=
                    116:       &Apache::lonnet::restore($symb,$courseid,$domain,$name);
                    117:   }
1.65      albertel  118:   #ignore error conditions
                    119:   my ($temp)=keys %Apache::lonhomework::history ;
                    120:   if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }
                    121: }
                    122: 
                    123: # -------------------------------------------------------------finalize_storage
                    124: # Stores away the result has to a student's environment
                    125: # checks form.grade_ for specific values, other wises stores
                    126: # to the running users environment
                    127: sub finalize_storage {
                    128:   my $result;
                    129:   my ($temp) = keys %Apache::lonhomework::results;
                    130:   if ( $temp ne '' ) {
1.66      albertel  131:     my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
1.67      albertel  132:     if ($ENV{'request.state'} eq 'construct') {
1.72      albertel  133:       $result=&Apache::lonnet::tmpstore(\%Apache::lonhomework::results,
                    134: 				      $ENV{'request.uri'},'',$domain,$name);
1.67      albertel  135:       &Apache::lonxml::debug('Construct Store return message:'.$result);
                    136:     } else {
                    137:       $result=&Apache::lonnet::cstore(\%Apache::lonhomework::results,
                    138: 				      $symb,$courseid,$domain,$name);
                    139:       &Apache::lonxml::debug('Store return message:'.$result);
                    140:     }
1.65      albertel  141:   }
                    142:   return $result;
                    143: }
                    144: 
                    145: sub checkout_msg {
                    146: return (<<ENDCHECKOUT);
                    147: <h2>The resource needs to be checked out</h2>
                    148: As a resource gets checked out, a unique timestamped ID is given to it, and a
                    149: permanent record is left in the system.<p />
                    150: <font color=red>
                    151: Checking out resources is subject to course policies, and may exclude future
                    152: credit even if done erroneously.<p />
                    153: </font>  
                    154: <form method=post>
                    155: <input type=button name="doescheckout" 
                    156: value="Check out Exam for Viewing" 
                    157: onClick="if (confirm('Check out Exam?')) { this.form.submit(); }" />
                    158: </form>
                    159: ENDCHECKOUT
                    160: }
                    161: 
1.9       albertel  162: sub start_problem {
1.40      albertel  163:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.19      albertel  164: 
1.81      albertel  165:   # meta is called from lonpublisher, which doesn't uses the normal
                    166:   # lonhomework method of parsing the file which means that inputtags 
                    167:   # won't get reset
                    168:   if ( $Apache::inputtags::part ne '' && $target != 'meta' ) {
1.79      albertel  169:     &Apache::lonxml::error('Only one problem allowed in a .problem file');
                    170:     my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[-1]);
                    171:     return '';
                    172:   }
1.19      albertel  173: #intialize globals
                    174:   $Apache::inputtags::part='0';
                    175:   @Apache::inputtags::responselist = ();
1.51      albertel  176:   @Apache::inputtags::previous=();
1.65      albertel  177:   &initialize_storage();
1.73      albertel  178:   if ($target eq 'web') {
                    179:     &Apache::lonhomework::showhash(%Apache::lonhomework::history);
                    180:   }
1.42      albertel  181:   $Apache::lonhomework::type=&Apache::lonnet::EXT('resource.0.type');
                    182:   &Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");
                    183:   if ($Apache::lonhomework::type eq '') {
1.53      albertel  184:     my $uri=$ENV{'request.uri'};
                    185:     if ($uri=~/\.(\w+)$/) {
                    186:       $Apache::lonhomework::type=$1;
                    187:       &Apache::lonxml::debug("Using type of $1");
                    188:     } else {
                    189:       $Apache::lonhomework::type='problem';
                    190:       &Apache::lonxml::debug("Using default type, problem, :$uri:");
                    191:     }
1.42      albertel  192:   }
1.58      www       193: 
1.67      albertel  194:   #added vars to the scripting enviroment
1.19      albertel  195:   my $expression='$external::part='.$Apache::inputtags::part.';';
                    196:   &Apache::run::run($expression,$safeeval);
1.22      albertel  197:   my $status;
1.55      www       198:   my $accessmsg;
1.36      albertel  199: 
1.41      albertel  200:   #should get back a <html> or the neccesary stuff to start XML/MathML
1.48      albertel  201:   my ($result,$head_tag_start,$body_tag_start)=
                    202:     &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
1.36      albertel  203: 
1.67      albertel  204: 
1.68      albertel  205:   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
1.67      albertel  206:     #handle exam checkout
                    207:     if ($Apache::lonhomework::type eq 'exam') {
                    208:       my $token=$Apache::lonhomework::history{"resource.0.outtoken"};
                    209:       if (($ENV{'form.doescheckout'}) && (!$token)) {
                    210: 	$token=&Apache::lonxml::maketoken();
                    211: 	$Apache::lonhomework::history{"resource.0.outtoken"}=$token;
                    212:       }
                    213:       $body_tag_start.=&Apache::lonxml::printtokenheader($target,$token);
                    214:     }
                    215: 
                    216:     #handle rand seed in construction space
                    217:     my $rndseed;
                    218:     if ($ENV{'request.state'} eq "construct") {
                    219:       $rndseed=$ENV{'form.rndseed'};
                    220:       if (!$rndseed) {
                    221: 	$rndseed=time;
                    222: 	$ENV{'form.rndseed'}=$rndseed;
1.58      www       223:       }
1.67      albertel  224:       &Apache::run::run('$external::randomseed='.$rndseed.';',$safeeval);
                    225:     }
1.55      www       226:     ($status,$accessmsg) = &Apache::lonhomework::check_access('0');
1.22      albertel  227:     push (@Apache::inputtags::status,$status);
1.24      albertel  228:     my $expression='$external::datestatus="'.$status.'";';
                    229:     $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
                    230:     &Apache::run::run($expression,$safeeval);
1.54      www       231:     if (( $status eq 'CLOSED' ) ||
                    232:         ( $status eq 'UNCHECKEDOUT') ||
                    233:         ( $status eq 'BANNED')) {
1.21      albertel  234:       my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[$#$parser]);
                    235:       if ( $target eq "web" ) {
1.41      albertel  236: 	$result.= $head_tag_start.'</head>';
1.54      www       237:         my $msg=$body_tag_start.
                    238: 	    '<h1>Not open to be viewed</h1>';
                    239:         if ($status eq 'CLOSED') {
1.55      www       240: 	    $msg.='The problem '.$accessmsg;
1.54      www       241: 	} elsif ($status eq 'UNCHECKEDOUT') {
1.65      albertel  242:             $msg.=&checkout_msg;
1.54      www       243:         }
1.67      albertel  244: 	$result.=$msg.'<br />';
                    245:       }
                    246:     } elsif ($target eq 'web') {
                    247:       my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);
                    248:       if ($name eq '') { 
                    249: 	$name=&Apache::lonnet::EXT('resource.title');
                    250: 	if ($name eq 'con_lost') { $name = ''; }
1.21      albertel  251:       }
1.67      albertel  252:       $Apache::lonhomework::name=$name;
                    253:       if ($status eq 'CAN_ANSWER') {
                    254: 	# create a page header and exit
                    255: 	$result.="$head_tag_start<title>$name</title></head>\n
1.41      albertel  256:               $body_tag_start\n
1.36      albertel  257:               <form name=\"lonhomework\" method=\"POST\" action=\"".$ENV{'request.uri'}."\">".
                    258: 		'<input type="hidden" name="submitted" value="yes" />';
1.67      albertel  259: 	if ($ENV{'request.state'} eq "construct") {
                    260: 	  $result.=
                    261: 	    '<input type="hidden" name="problemmode" value="View" />
                    262:              <input type="submit" name="problemmode" value="Edit" />
1.73      albertel  263:              <input type="submit" name="problemmode" value="EditXML" />
1.67      albertel  264:              Random Seed:<input type="text" name="rndseed" width="10" value="'.
1.72      albertel  265: 	       $rndseed.'" />
1.73      albertel  266:              <input type="submit" name="changerandseed" value="Change" />
1.72      albertel  267:              <input type="submit" name="resetdata" value="Reset Submissions" />
                    268:              <hr />';
1.67      albertel  269: 	}
                    270: 	# if we are viewing someone else preserve that info
                    271: 	if (defined $ENV{'form.grade_symb'}) {
                    272: 	  foreach my $field ('symb','courseid','domain','username') {
                    273: 	    $result .= '<input type="hidden" name="grade_'.$field.
                    274: 	      '" value="'.$ENV{"form.grade_$field"}.'" />'."\n";
                    275: 	  }
1.65      albertel  276: 	}
1.67      albertel  277:       } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER'
                    278: 	       || $status eq 'CLOSED') {
                    279: 	$result.=$head_tag_start.
                    280: 	  "<title>$name</title></head>\n$body_tag_start\n";
1.65      albertel  281:       }
1.22      albertel  282:     }
1.67      albertel  283:   } elsif ($target eq 'edit') {
1.41      albertel  284:     $result.=$head_tag_start."</head>".$body_tag_start.
1.67      albertel  285:       '<form name="lonhomework" method="POST" action="'.
                    286: 	$ENV{'request.uri'}.'">
1.41      albertel  287:        <input type="hidden" name="submitted" value="edit" />
                    288:        <input type="hidden" name="problemmode" value="Edit" />
                    289:        <input type="submit" name="problemmode" value="View" />
1.73      albertel  290:        <input type="submit" name="problemmode" value="EditXML" />
1.41      albertel  291:        <input type="submit" name="Undo" value="undo" /> <hr />
1.49      albertel  292:        <input type="submit" name="submit" value="Submit Changes" /><br />
1.41      albertel  293:       ';
1.39      albertel  294:     my $temp=&Apache::edit::insertlist($target,$token);
1.36      albertel  295:     $result.=$temp;
1.67      albertel  296:   } elsif ($target eq 'modified') {
1.37      albertel  297:     $result=$token->[4];
                    298:     $result.=&Apache::edit::handle_insert();
1.77      sakharuk  299:   } elsif ($target eq 'tex') {
                    300:       $result .= '\begin{document}\noindent\textbf{Problem.}\newline';
1.67      albertel  301:   } else {
                    302:     # page_start returned a starting result, delete it if we don't need it
                    303:     $result = '';
1.37      albertel  304:   }
1.67      albertel  305:   return $result;
1.9       albertel  306: }
                    307: 
                    308: sub end_problem {
1.40      albertel  309:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.16      albertel  310:   my $result='';
1.24      albertel  311:   my $status=$Apache::inputtags::status['-1'];
1.68      albertel  312:   if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ) {
1.28      albertel  313:     if ( $target eq 'grade' && $Apache::inputtags::part eq '0' &&
                    314:        $status eq 'CAN_ANSWER') {
1.19      albertel  315:       # if part is zero, no <part>s existed, so we need to the grading
                    316:       &Apache::inputtags::grade;
1.68      albertel  317:     } elsif ( $target eq 'web' && $Apache::inputtags::part eq '0') {
1.19      albertel  318:       # if part is zero, no <part>s existed, so we need show the current 
                    319:       # grading status
1.20      albertel  320:       $result.= &Apache::inputtags::gradestatus($Apache::inputtags::part);
1.41      albertel  321:     }
1.68      albertel  322:     if (
                    323: 	($target eq 'web' && ($ENV{'request.state'} ne 'construct')) ||
                    324: 	($target eq 'answer')
                    325:        ) {
1.22      albertel  326:       if ($status eq 'CAN_ANSWER') {
                    327: 	$result.="</form></body>\n"; 
1.28      albertel  328:       } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER') {
1.41      albertel  329: 	$result.="</body>\n";
                    330:       }
1.50      albertel  331:       $result.=&Apache::lonxml::xmlend();
1.22      albertel  332:     }
1.65      albertel  333:     if ($target eq 'grade') { 
                    334:       &Apache::lonhomework::showhash(%Apache::lonhomework::results);
                    335:       &finalize_storage();
                    336:     }
                    337:   } elsif ($target eq 'meta') {
1.18      albertel  338:     if ($Apache::inputtags::part eq '0') {
1.16      albertel  339:       $result=&Apache::response::mandatory_part_meta;
                    340:     }
1.65      albertel  341:   } elsif ($target eq 'edit') {
1.34      albertel  342:     &Apache::lonxml::debug("in end_problem with $target, edit");
1.48      albertel  343:     $result='<br /><input type="submit" name="submit" value="Submit Changes" />';
1.77      sakharuk  344:   } elsif ($target eq 'tex') {
                    345:       $result .= '\end{document}';
1.48      albertel  346:   }
                    347:   return $result;
                    348: }
                    349: 
                    350: sub start_library {
                    351:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                    352:   my ($result,$head_tag_start,$body_tag_start)=
                    353:     &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
                    354:   if ($target eq 'edit') {
                    355:     $result.=$head_tag_start."</head>".$body_tag_start.
                    356:       '<form name="lonhomework" method="POST" action="'.$ENV{'request.uri'}.'">
                    357:        <input type="hidden" name="submitted" value="edit" />
                    358:        <input type="hidden" name="problemmode" value="Edit" />
                    359:        <input type="submit" name="problemmode" value="View" />
                    360:        <input type="submit" name="Undo" value="undo" /> <hr />
                    361:       ';
                    362:     my $temp=&Apache::edit::insertlist($target,$token);
                    363:     $result.=$temp;
                    364:     return $result;
                    365:   }
                    366:   if ($target eq 'modified') {
                    367:     $result=$token->[4];
                    368:     $result.=&Apache::edit::handle_insert();
                    369:     return $result;
                    370:   }
                    371:   return '';
                    372: }
                    373: 
                    374: sub end_library {
                    375:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                    376:   my $result='';
                    377:   if ($target eq 'edit') {
1.34      albertel  378:     $result='<br /><input type="submit" name="submit" value="Submit Changes" />';
                    379:   }
1.16      albertel  380:   return $result;
1.1       albertel  381: }
                    382: 
                    383: sub start_block {
1.40      albertel  384:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.1       albertel  385: 
1.68      albertel  386:   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
1.38      albertel  387:     my $code = @$parstack[$#$parstack];
                    388:     $code =~ s/\"//g;
                    389:     $code .=';return $condition;';
                    390:     #  print "<br />$code<br />";
                    391:     my $result = &Apache::run::run($code,$safeeval);
                    392:     &Apache::lonxml::debug("block :$code: returned :$result:");
                    393:     if ( ! $result ) { 
                    394:       my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);
                    395:       &Apache::lonxml::debug("skipping ahead :$skip: $$parser[$#$parser]");
                    396:     }
1.1       albertel  397:   }
                    398:   return "";
                    399: }
                    400: 
                    401: sub end_block {
1.38      albertel  402:   return '';
1.4       tsai      403: }
                    404: 
                    405: sub start_while {
1.40      albertel  406:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.4       tsai      407: 
                    408:   my $code = @$parstack[$#$parstack];
                    409:   $code =~ s/\"//g;
                    410:   $code .=';return $condition;';
                    411: 
1.5       tsai      412:   push( @Apache::structuretags::whileconds, $code); 
1.4       tsai      413:   my $result = &Apache::run::run($code,$safeeval);
                    414:   my $bodytext=$$parser[$#$parser]->get_text("/while");
1.5       tsai      415:   push( @Apache::structuretags::whilebody, $bodytext);
                    416:   if ( $result ) { 
1.8       albertel  417:     &Apache::lonxml::newparser($parser,\$bodytext);
1.4       tsai      418:   }
                    419:   return "";
                    420: }
                    421: 
                    422: sub end_while {
1.40      albertel  423:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.5       tsai      424:   my $code = pop @Apache::structuretags::whileconds;
                    425:   my $bodytext = pop @Apache::structuretags::whilebody;
                    426:   my $result = &Apache::run::run($code,$safeeval);
                    427:   if ( $result ) { 
1.8       albertel  428:     &Apache::lonxml::newparser($parser,\$bodytext);
1.5       tsai      429:   } 
                    430:   return "";
1.1       albertel  431: }
1.6       tsai      432: 
                    433: # <randomlist> 
                    434: #  <tag1>..</tag1>
                    435: #  <tag2>..</tag2>
                    436: #  <tag3>..</tag3>
                    437: #  ... 
                    438: # </randomlist>
                    439: sub start_randomlist {
1.40      albertel  440:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.71      albertel  441:   if ($target eq 'answer' || $target eq 'grade' || $target eq 'web') {
                    442:     my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);
                    443:     my $b_parser= HTML::TokeParser->new(\$body);
                    444:     my $b_tok;
                    445:     my @randomlist;
                    446:     my $list_item;
                    447:     while($b_tok = $b_parser->get_token() ) {
                    448:       if($b_tok->[0] eq 'S') { # start tag
                    449: 	# get content of the tag until matching end tag
                    450: 	# get all text upto the matching tag
                    451: 	# and push the content into @randomlist
                    452: 	$list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
                    453: 	$list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
                    454: 	push(@randomlist,$list_item);
                    455: 	#  print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4], $list_item</b>";
                    456:       }
                    457:       if($b_tok->[0] eq 'T') { # text
                    458: 	# what to do with text in between tags?
                    459: 	#  print "<b>TEXT $b_tok->[1]</b><br />";
                    460:       }
                    461:       # if($b_tok->[0] eq 'E') { # end tag, should not happen
                    462:       #  print "<b>END-TAG $b_tok->[1]</b><br />";
                    463:       # }
                    464:     }
1.6       tsai      465: 
1.71      albertel  466:     my @idx_arr = (0 .. $#randomlist);
                    467:     &Apache::structuretags::shuffle(\@idx_arr);
                    468:     my $bodytext = '';
                    469:     for(0 .. $#randomlist) {
                    470:       $bodytext .= "$randomlist[ $idx_arr[$_] ]";
1.6       tsai      471:     }
1.71      albertel  472:     &Apache::lonxml::newparser($parser,\$bodytext);
1.7       tsai      473:   }
1.6       tsai      474:   return "";
1.7       tsai      475: }
                    476: 
                    477: sub shuffle {
                    478:     my $a=shift;
                    479:     my $i;
1.70      albertel  480:     if (defined(@$a)) {
                    481:       &Apache::response::setrandomnumber();
                    482:       for($i=@$a;--$i;) {
                    483: 	my $j=int rand($i+1);
                    484: 	next if $i == $j;
                    485: 	@$a[$i,$j] = @$a[$j,$i];
                    486:       }
1.7       tsai      487:     }
1.6       tsai      488: }
                    489: 
                    490: sub end_randomlist {
1.46      albertel  491:   return '';
1.6       tsai      492: }
                    493: 
1.11      albertel  494: sub start_part {
1.40      albertel  495:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.39      albertel  496:   my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
1.47      albertel  497:   if ($id eq '') { $id = $Apache::lonxml::curdepth; }
1.14      albertel  498:   $Apache::inputtags::part=$id;
1.18      albertel  499:   @Apache::inputtags::responselist = ();
1.51      albertel  500:   @Apache::inputtags::previous=();
1.15      www       501:   if ($target eq 'meta') {
1.16      albertel  502:     return &Apache::response::mandatory_part_meta;
1.68      albertel  503:   } elsif ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
1.55      www       504:     my ($status,$accessmsg) = &Apache::lonhomework::check_access($id);
1.23      albertel  505:     push (@Apache::inputtags::status,$status);
                    506:     my $expression='$external::datestatus="'.$status.'";';
                    507:     $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
                    508:     &Apache::run::run($expression,$safeeval);
                    509:     if ( $status eq 'CLOSED' ) {
1.21      albertel  510:       my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);
                    511:       if ( $target eq "web" ) {
1.55      www       512: 	return "<br />Part is not open to be viewed. It $accessmsg<br />";
1.21      albertel  513:       }
                    514:     }
1.15      www       515:   }
1.19      albertel  516:   return '';
1.11      albertel  517: }
                    518: 
                    519: sub end_part {
1.40      albertel  520:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.18      albertel  521:   &Apache::lonxml::debug("in end_part $target ");
1.28      albertel  522:   my $status=$Apache::inputtags::status['-1'];
1.23      albertel  523:   pop @Apache::inputtags::status;
1.19      albertel  524:   if ( $target eq 'meta' ) { return ''; }
1.37      albertel  525:   if ( $target eq 'grade' && $status eq 'CAN_ANSWER') {
                    526:     return &Apache::inputtags::grade;
1.28      albertel  527:   }
1.37      albertel  528:   if ($target eq 'web') {
                    529:     return &Apache::inputtags::gradestatus($Apache::inputtags::part);
                    530:   }
                    531:   return '';
1.11      albertel  532: }
1.1       albertel  533: 
1.25      albertel  534: sub start_preduedate {
1.40      albertel  535:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.68      albertel  536:   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
1.29      albertel  537:     if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
                    538: 	$Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' ) {
1.26      albertel  539:       &Apache::lonxml::get_all_text("/preduedate",$$parser[$#$parser]);
1.24      albertel  540:     }
                    541:   }
                    542:   return '';
                    543: }
                    544: 
1.25      albertel  545: sub end_preduedate {
1.24      albertel  546:   return '';
                    547: }
                    548: 
1.25      albertel  549: sub start_postanswerdate {
1.40      albertel  550:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.34      albertel  551:   if ($target eq 'web' || $target eq 'grade') {
1.24      albertel  552:     if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
1.26      albertel  553:       &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);
1.24      albertel  554:     }
                    555:   }
                    556:   return '';
                    557: }
                    558: 
1.25      albertel  559: sub end_postanswerdate {
1.24      albertel  560:   return '';
                    561: }
                    562: 
1.25      albertel  563: sub start_notsolved {
1.40      albertel  564:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.68      albertel  565:   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
1.24      albertel  566:     my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
                    567:     &Apache::lonxml::debug("not solved has :$gradestatus:");
                    568:     if ($gradestatus =~ /^correct/) {
                    569:       &Apache::lonxml::debug("skipping");
1.26      albertel  570:       &Apache::lonxml::get_all_text("/notsolved",$$parser[$#$parser]);
1.24      albertel  571:     }
                    572:   }
                    573:   return '';
                    574: }
                    575: 
1.25      albertel  576: sub end_notsolved {
1.24      albertel  577:   return '';
                    578: }
                    579: 
                    580: sub start_solved {
1.40      albertel  581:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.68      albertel  582:   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
1.24      albertel  583:     my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
                    584:     if ($gradestatus !~ /^correct/) {
                    585:       &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);
                    586:     }
                    587:   }
                    588:   return '';
                    589: }
                    590: 
                    591: sub end_solved {
                    592:   return '';
                    593: }
1.34      albertel  594: 
                    595: sub start_startouttext {
1.40      albertel  596:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.35      albertel  597:   my @result=(''.'');
                    598:   if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
                    599:   return (@result);
1.34      albertel  600: }
                    601: sub end_startouttext {
1.40      albertel  602:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.34      albertel  603:   my $result='';
1.35      albertel  604:   my $text='';
                    605: 
1.34      albertel  606:   if ($target eq 'edit') {
1.70      albertel  607:     $text=&Apache::lonxml::get_all_text("endouttext",$$parser[-1]);
1.43      albertel  608:     $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
1.42      albertel  609: <td>Delete:".
                    610:   &Apache::edit::deletelist($target,$token)
1.82    ! albertel  611:     ."</td>
1.42      albertel  612: <td>".
                    613:   &Apache::edit::insertlist($target,$token).
1.82    ! albertel  614:     &Apache::edit::end_row().&Apache::edit::start_spanning_row()."\n".
        !           615:       &Apache::edit::editfield($token->[1],$text,"",50,4);
1.35      albertel  616:   }
                    617:   if ($target eq 'modified') {
                    618:     $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
                    619:     $result='<startouttext />'.&Apache::edit::modifiedfield();
1.34      albertel  620:   }
                    621:   return $result;
                    622: }
                    623: sub start_endouttext {
1.40      albertel  624:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.34      albertel  625:   my $result='';
1.43      albertel  626:   if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
1.35      albertel  627:   if ($target eq "modified") { $result='<endouttext />'; }
1.34      albertel  628:   return $result;
                    629: }
                    630: sub end_endouttext {
1.40      albertel  631:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1.35      albertel  632:   my @result=('','');
                    633:   if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
                    634:   return (@result);
1.34      albertel  635: }
1.45      albertel  636: sub delete_startouttext {
                    637:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                    638: #  my $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
                    639:   my $text=$$parser['-1']->get_text("/endouttext");
1.69      albertel  640:   my $ntoken=$$parser['-1']->get_token();
                    641:   &Apache::lonxml::debug("Deleting :$text: and :$ntoken->[0]:$ntoken->[1]:$ntoken->[2]: for startouttext");
                    642:   &Apache::lonxml::end_tag($tagstack,$parstack,$ntoken);
1.45      albertel  643:   # Deleting 2 parallel tag pairs, but we need the numbers later to look like 
                    644:   # they did the last time round
1.69      albertel  645:   &Apache::lonxml::increasedepth($ntoken);
                    646:   &Apache::lonxml::decreasedepth($ntoken);
1.45      albertel  647:   return 1;
                    648: }
1.34      albertel  649: 
1.1       albertel  650: 1;
                    651: __END__

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