1: # The LearningOnline Network with CAPA
2: # definition of tags that give a structure to a document
3: #
4: # $Id: structuretags.pm,v 1.162 2003/04/03 20:05:21 albertel Exp $
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: #
28: # 2/19 Guy
29: # 6/26/2001 fixed extra web display at end of <web></web> tags
30: # 8/17,8/18,8/20 Gerd Kortemeyer
31:
32:
33: package Apache::structuretags;
34:
35: use strict;
36: use Apache::lonnet;
37: use Apache::File();
38: use Apache::lonmenu;
39:
40: BEGIN {
41: &Apache::lonxml::register('Apache::structuretags',('block','while','randomlist','problem','library','web','tex','part','preduedate','postanswerdate','solved','notsolved','startouttext','endouttext'));
42: }
43:
44: sub start_web {
45: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
46: my $bodytext=&Apache::lonxml::get_all_text("/web",$parser);
47: if ($target eq 'web') {
48: return $bodytext;
49: }
50: return '';
51: }
52:
53: sub end_web {
54: return '';
55: }
56:
57: sub start_tex {
58: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
59: my $bodytext=&Apache::lonxml::get_all_text("/tex",$parser);
60: if ($target eq 'tex') {
61: return $bodytext.' ';
62: }
63: return '';
64: }
65:
66: sub end_tex {
67: return '';
68: }
69:
70: sub page_start {
71: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
72: my %found;
73: foreach my $taginside ($tagstack) {
74: foreach my $taglookedfor ('html','body','form') {
75: if ($taginside =~ /^$taglookedfor$/i) {$found{$taglookedfor} = 1;}
76: }
77: }
78:
79: my $result;
80: my $head_tag_start;
81: if (!defined($found{'html'})) {
82: $result=&Apache::londefdef::start_html($target,$token,$tagstack,
83: $parstack,$parser,$safeeval);
84: $head_tag_start='<head>'.&Apache::lonmenu::registerurl(undef,$target);
85: }
86: my $body_tag_start;
87: if (!defined($found{'body'})) {
88: $body_tag_start='<body onLoad="'.&Apache::lonmenu::loadevents().'" '.
89: 'onUnload="'.&Apache::lonmenu::unloadevents().'" ';
90: my $background=&Apache::lonxml::get_param('background',$parstack,
91: $safeeval);
92: if ($background) {
93: $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=
94: $background;
95: $body_tag_start.='background="'.$background.'" ';
96: } else {
97: my $bgcolor=&Apache::lonxml::get_param('bgcolor',$parstack,
98: $safeeval);
99: if ($bgcolor) {
100: $body_tag_start.='bgcolor="'.$bgcolor.'" ';
101: } else {
102: $body_tag_start.='bgcolor="#ffffff"';
103: }
104: }
105: $body_tag_start.='>'.&Apache::lonmenu::menubuttons(undef,$target,1);
106: if ($target eq 'web' && $ENV{'request.state'} ne 'construct') {
107: my ($symb)=&Apache::lonxml::whichuser();
108: if ($symb eq '') {
109: my $help = &Apache::loncommon::help_open_topic("Ambiguous_Reference");
110: $help="Browsing resource, all submissions are temporary.<br />";
111: $body_tag_start.=$help;
112: }
113: }
114: }
115: my $form_tag_start;
116: if (!defined($found{'form'})) {
117: $form_tag_start='<form name="lonhomework" method="POST" action="'.
118: $ENV{'request.uri'}.'">';
119: }
120: return ($result,$head_tag_start,$body_tag_start,$form_tag_start);
121: }
122:
123: #use Time::HiRes();
124: sub get_resource_name {
125: my ($parstack,$safeeval)=@_;
126: my $name=&Apache::lonnet::gettitle();
127: if ($name eq '') {
128: $name=&Apache::lonnet::EXT('resource.title');
129: if ($name eq 'con_lost') { $name = ''; }
130: }
131: $Apache::lonhomework::name=$name;
132: return $name;
133: }
134:
135: sub setup_rndseed {
136: my ($safeeval)=@_;
137: my $rndseed;
138: my ($symb)=&Apache::lonxml::whichuser();
139: if ($ENV{'request.state'} eq "construct" || $symb eq '') {
140: $rndseed=$ENV{'form.rndseed'};
141: if (!$rndseed) {
142: $rndseed=$Apache::lonhomework::history{'rndseed'};
143: if (!$rndseed) {
144: $rndseed=time;
145: $ENV{'form.rndseed'}=$rndseed;
146: }
147: }
148: if ($ENV{'form.resetdata'} eq 'New Problem Variation') {
149: $rndseed=time;
150: $ENV{'form.rndseed'}=$rndseed;
151: }
152: &Apache::lonxml::debug("Setting rndseed to $rndseed");
153: &Apache::run::run('$external::randomseed='.$rndseed.';',$safeeval);
154: }
155: return $rndseed;
156: }
157:
158: sub problem_edit_header {
159: return '<input type="hidden" name="submitted" value="edit" />
160: <input type="hidden" name="problemmode" value="Edit" />
161: <input type="submit" name="problemmode" value="Discard Edits and View" />
162: <input type="submit" name="problemmode" value="EditXML" />
163: <input type="submit" name="Undo" value="undo" /> <hr />
164: <input type="submit" name="submit" value="Submit Changes and Edit" />
165: <input type="submit" name="submit" value="Submit Changes and View" /><br /><p> </p><table border="0"><tr><td bgcolor="#DDDDDD">
166: ';
167: }
168:
169: sub problem_edit_footer {
170: return '</td></tr></table><br /><input type="submit" name="submit" value="Submit Changes and Edit" />
171: <input type="submit" name="submit" value="Submit Changes and View" />';
172: }
173:
174: sub problem_web_to_edit_header {
175: my ($rndseed)=@_;
176: my $result.='<input type="hidden" name="problemmode" value="View" />
177: <input type="submit" name="problemmode" value="Edit" />
178: <input type="submit" name="problemmode" value="EditXML" />
179: Random Seed:<input type="text" name="rndseed" width="10" value="'.
180: $rndseed.'" />
181: <input type="submit" name="changerandseed" value="Change" />
182: <input type="submit" name="resetdata" value="Reset Submissions" />
183: <input type="checkbox" name="showallfoils" ';
184: if (defined($ENV{'form.showallfoils'})) { $result.='checked="on"'; }
185: $result.= ' /> Show All Foils
186: <hr />';
187: my $numtoanalyze=$ENV{'form.numtoanalyze'};
188: if (!$numtoanalyze) { $numtoanalyze=100; }
189: $result.= '<input type="submit" name="problemmode" value="Answer Distribution" />
190: <input type="text" name="numtoanalyze" value="'.
191: $numtoanalyze.'" size="5" /> <hr />';
192: return $result;
193: }
194:
195: sub initialize_storage {
196: %Apache::lonhomework::results=();
197: %Apache::lonhomework::history=();
198: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
199: if ($ENV{'request.state'} eq 'construct' || $symb eq '') {
200: %Apache::lonhomework::history=
201: &Apache::lonnet::tmprestore($ENV{'request.uri'},'',$domain,$name);
202: my ($temp)=keys %Apache::lonhomework::history ;
203: &Apache::lonxml::debug("Return message of $temp");
204: } else {
205: %Apache::lonhomework::history=
206: &Apache::lonnet::restore($symb,$courseid,$domain,$name);
207: }
208: #ignore error conditions
209: my ($temp)=keys %Apache::lonhomework::history ;
210: if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }
211: }
212:
213: # -------------------------------------------------------------finalize_storage
214: # Stores away the result has to a student's environment
215: # checks form.grade_ for specific values, other wises stores
216: # to the running users environment
217: sub finalize_storage {
218: my $result;
219: my ($temp) = keys %Apache::lonhomework::results;
220: if ( $temp ne '' ) {
221: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
222: if ($ENV{'request.state'} eq 'construct' || $symb eq '') {
223: $Apache::lonhomework::results{'rndseed'}=$ENV{'form.rndseed'};
224: $result=&Apache::lonnet::tmpstore(\%Apache::lonhomework::results,
225: $ENV{'request.uri'},'',$domain,$name);
226: &Apache::lonxml::debug('Construct Store return message:'.$result);
227: } else {
228: $result=&Apache::lonnet::cstore(\%Apache::lonhomework::results,
229: $symb,$courseid,$domain,$name);
230: &Apache::lonxml::debug('Store return message:'.$result);
231: }
232: }
233: return $result;
234: }
235:
236: sub checkout_msg {
237: return (<<ENDCHECKOUT);
238: <h2>The resource needs to be checked out</h2>
239: As a resource gets checked out, a unique timestamped ID is given to it, and a
240: permanent record is left in the system.<p />
241: <font color=red>
242: Checking out resources is subject to course policies, and may exclude future
243: credit even if done erroneously.<p />
244: </font>
245: <form name="checkout" method="POST" action="$ENV{'request.uri'}">
246: <input type="hidden" name="doescheckout" value="yes" />
247: <input type="button" name="checkoutbutton" value="Check out Exam for Viewing" onClick="javascript:if (confirm('Check out Exam?')) { document.checkout.submit(); }" />
248: </form>
249: ENDCHECKOUT
250: }
251:
252: sub start_problem {
253: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
254:
255: $Apache::lonhomework::parsing_a_problem=1;
256: # meta is called from lonpublisher, which doesn't uses the normal
257: # lonhomework method of parsing the file which means that inputtags
258: # won't get reset
259: if ( $Apache::inputtags::part ne '' && $target != 'meta' ) {
260: &Apache::lonxml::error('Only one problem allowed in a .problem file');
261: my $bodytext=&Apache::lonxml::get_all_text("/problem",$parser);
262: return '';
263: }
264: #initialize globals
265: $Apache::inputtags::part='0';
266: @Apache::inputtags::responselist = ();
267: @Apache::inputtags::previous=();
268: @Apache::inputtags::previous_version=();
269: $Apache::structuretags::printanswer='No';
270: @Apache::structuretags::whileconds=();
271: @Apache::structuretags::whilebody=();
272: @Apache::structuretags::whileline=();
273:
274: if ($target ne 'analyze') {
275: &initialize_storage();
276: if ($target eq 'web') {
277: &Apache::lonhomework::showhash(%Apache::lonhomework::history);
278: }
279: $Apache::lonhomework::type=&Apache::lonnet::EXT('resource.0.type');
280: &Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");
281: }
282: if ($Apache::lonhomework::type eq '') {
283: my $uri=$ENV{'request.uri'};
284: if ($uri=~/\.(\w+)$/) {
285: $Apache::lonhomework::type=$1;
286: &Apache::lonxml::debug("Using type of $1");
287: } else {
288: $Apache::lonhomework::type='problem';
289: &Apache::lonxml::debug("Using default type, problem, :$uri:");
290: }
291: }
292:
293: #added vars to the scripting enviroment
294: my $expression='$external::part='.$Apache::inputtags::part.';';
295: &Apache::run::run($expression,$safeeval);
296: my $status;
297: my $accessmsg;
298:
299: #should get back a <html> or the neccesary stuff to start XML/MathML
300: my ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
301: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
302: if ($target eq 'tex' and $ENV{'request.symb'} =~ m/\.page_/) {$result='';}
303:
304: if ($target eq 'analyze') { my $rndseed=&setup_rndseed($safeeval); }
305: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
306: $target eq 'tex') {
307: #handle exam checkout
308: if ($Apache::lonhomework::type eq 'exam') {
309: my $token=
310: $Apache::lonhomework::history{"resource.0.outtoken"};
311: if (($ENV{'form.doescheckout'}) && (!$token)) {
312: $token=&Apache::lonxml::maketoken();
313: $Apache::lonhomework::history{"resource.0.outtoken"}=
314: $token;
315: }
316: $body_tag_start.=&Apache::lonxml::printtokenheader($target,$token);
317: }
318:
319: #handle rand seed in construction space
320: my $rndseed=&setup_rndseed($safeeval);
321: my ($symb)=&Apache::lonxml::whichuser();
322: if ($ENV{'request.state'} ne "construct" || $symb eq '') {
323: $form_tag_start.='<input type="hidden" name="rndseed" value="'.
324: $rndseed.'" />'.
325: '<input type="submit" name="resetdata"
326: value="New Problem Variation" />';
327: }
328: ($status,$accessmsg) = &Apache::lonhomework::check_access('0');
329: push (@Apache::inputtags::status,$status);
330: my $expression='$external::datestatus="'.$status.'";';
331: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
332: &Apache::run::run($expression,$safeeval);
333: &Apache::lonxml::debug("Got $status");
334: if (( $status eq 'CLOSED' ) ||
335: ( $status eq 'UNCHECKEDOUT') ||
336: ( $status eq 'BANNED') ||
337: ( $status eq 'UNAVAILABLE')) {
338: my $bodytext=&Apache::lonxml::get_all_text("/problem",$parser);
339: if ( $target eq "web" ) {
340: $result.= $head_tag_start.'</head>';
341: my $msg=$body_tag_start;
342: if ($status eq 'UNAVAILABLE') {
343: $result.='<h1>Unable to determine if this resource is open due to network problems. Please try again later.</h1>';
344: } else {
345: $result.='<h1>Not open to be viewed</h1>';
346: }
347: if ($status eq 'CLOSED') {
348: $msg.='The problem '.$accessmsg;
349: } elsif ($status eq 'UNCHECKEDOUT') {
350: $msg.=&checkout_msg;
351: }
352: $result.=$msg.'<br />';
353: } elsif ($target eq 'tex') {
354: $result.='\begin{document}\noindent \vskip 1 mm \begin{minipage}{\textwidth}\vskip 0 mm';
355: if ($status eq 'UNAVAILABLE') {
356: $result.='Unable to determine if this resource is open due to network problems. Please try again later.\vskip 0 mm ';
357: } else {
358: $result.="Problem is not open to be viewed. It $accessmsg \\vskip 0 mm ";
359: }
360: }
361: } elsif ($target eq 'web') {
362: my $name= &get_resource_name($parstack,$safeeval);
363: if ($status eq 'CAN_ANSWER') {
364: # create a page header and exit
365: $result.="$head_tag_start<title>$name</title></head>
366: $body_tag_start \n $form_tag_start".
367: '<input type="hidden" name="submitted" value="yes" />';
368: if ($ENV{'request.state'} eq "construct") {
369: $result.= &problem_web_to_edit_header($rndseed);
370: }
371: # if we are viewing someone else preserve that info
372: if (defined $ENV{'form.grade_symb'}) {
373: foreach my $field ('symb','courseid','domain','username') {
374: $result .= '<input type="hidden" name="grade_'.$field.
375: '" value="'.$ENV{"form.grade_$field"}.'" />'."\n";
376: }
377: }
378: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER'
379: || $status eq 'CLOSED' || $status eq 'UNAVALAILABLE') {
380: $result.=$head_tag_start.
381: "<title>$name</title></head>\n$body_tag_start\n";
382: }
383: } elsif ($target eq 'tex') {
384: my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);
385: if ($name eq '') {
386: $name=&Apache::lonnet::EXT('resource.title');
387: if ($name eq 'con_lost') { $name = ''; }
388: }
389: $Apache::lonhomework::name=$name;
390: my $id = $Apache::inputtags::part;
391: my $weight = &Apache::lonnet::EXT("resource.$id.weight");
392: my $allkeys=&Apache::lonnet::metadata($ENV{'request.uri'},'keys');
393: my @allkeys = split /,/,$allkeys;
394: my $allow_print_points = 0;
395: foreach my $partial_key (@allkeys) {
396: if ($partial_key=~m/weight/) {
397: $allow_print_points++;
398: }
399: }
400: my $duedate = &Apache::lonnet::EXT("resource.$id.duedate");
401: $duedate = POSIX::strftime("%c",localtime($duedate));
402: my $temp_file;
403: my $filename = "/home/httpd/prtspool/$ENV{'user.name'}_$ENV{'user.domain'}_printout.due";
404: if (-e $filename) {
405: $temp_file = Apache::File->new($filename);
406: } else {
407: $temp_file = Apache::File->new('>>'.$filename);
408: }
409: my @due_file_content = <$temp_file>;
410: my $due_file_content = $due_file_content[$#due_file_content];
411: chomp $due_file_content;
412: my $name_of_resourse= &get_resource_name($parstack,$safeeval);
413: if ($due_file_content ne $duedate) {
414: $temp_file = Apache::File->new('>'.$filename);
415: print $temp_file "$duedate\n";
416: if (not $ENV{'request.symb'} =~ m/\.page_/) {
417: if(not $duedate=~m/1969/ and $Apache::lonhomework::type ne 'exam') {
418: $result .= '\begin{document} \typeout{STAMPOFPASSEDRESOURCESTART Resource <h2>"'.$name_of_resourse.'"</h2> located in <br /><small><b>'.$ENV{'request.uri'}.'</b></small><br /> STAMPOFPASSEDRESOURCEEND} \noindent\textit{Due date: '.$duedate.'} \vskip 1 mm\noindent \begin{minipage}{\textwidth}';
419: } else {
420: $result .= '\begin{document} \typeout{STAMPOFPASSEDRESOURCESTART Resource <h2>"'.$name_of_resourse.'"</h2> located in <br /><small><b>'.$ENV{'request.uri'}.'</b></small><br /> STAMPOFPASSEDRESOURCEEND} \noindent \vskip 1 mm \noindent\begin{minipage}{\textwidth}';
421: if ($Apache::lonhomework::type eq 'exam' and $allow_print_points==1) { $result .= '\fbox{\textit{'.$weight.' pt}}';}
422: }
423: } else {
424: $result .= '\vskip 1mm\textit{Due date: '.$duedate.'} \\\\\\\\';
425: }
426: } else {
427: if (not $ENV{'request.symb'} =~ m/\.page_/) {
428: $result .= '\begin{document} \typeout{STAMPOFPASSEDRESOURCESTART Resource <h2>"'.$name_of_resourse.'"</h2> located in <br /><small><b>'.$ENV{'request.uri'}.'</b></small><br /> STAMPOFPASSEDRESOURCEEND} \noindent \vskip 1 mm\noindent\begin{minipage}{\textwidth}';
429: if (($Apache::lonhomework::type eq 'exam') and ($allow_print_points==1)) { $result .= '\fbox{\textit{'.$weight.' pt}}';}
430: } else {
431: $result .= '\vskip 1mm \\\\\\\\';
432: }
433: }
434: }
435: } elsif ($target eq 'edit') {
436: $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
437: &problem_edit_header();
438: my $temp=&Apache::edit::insertlist($target,$token);
439: $result.=$temp;
440: } elsif ($target eq 'modified') {
441: $result=$token->[4];
442: $result.=&Apache::edit::handle_insert();
443: } else {
444: # page_start returned a starting result, delete it if we don't need it
445: $result = '';
446: }
447: return $result;
448: }
449:
450: sub end_problem {
451: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
452: my $result='';
453: my $status=$Apache::inputtags::status['-1'];
454: if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ||
455: $target eq 'tex') {
456: if ( $target eq 'grade' && $Apache::inputtags::part eq '0' &&
457: $status eq 'CAN_ANSWER' ) {
458: # if part is zero, no <part>s existed, so we need to the grading
459: &Apache::inputtags::grade;
460: } elsif ( ($target eq 'web' || $target eq 'tex') &&
461: $Apache::inputtags::part eq '0' &&
462: $status ne 'UNCHECKEDOUT') {
463: # if part is zero, no <part>s existed, so we need show the current
464: # grading status
465: my $gradestatus = &Apache::inputtags::gradestatus($Apache::inputtags::part,$target);
466: $result.= $gradestatus;
467: }
468: if (
469: (($target eq 'web') && ($ENV{'request.state'} ne 'construct')) ||
470: ($target eq 'answer') || ($target eq 'tex')
471: ) {
472: if ($status eq 'CAN_ANSWER') {
473: if ($target ne 'tex') {
474: $result.="</form></body>\n";
475: }
476: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' ||
477: $status eq 'UNCHECKEDOUT' ) {
478: if ($target ne 'tex') {
479: $result.="</body>\n";
480: }
481: }
482: if ($target eq 'web') {
483: $result.=&Apache::lonxml::xmlend();
484: } elsif ($target eq 'tex') {
485: $result .= '\vskip 0.5mm\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}';
486: if (not $ENV{'request.symb'} =~ m/\.page_/) {
487: $result .= '\end{minipage}\end{document} ';
488: } else {
489: $result .= '';
490: }
491: }
492: }
493: if ($target eq 'grade') {
494: &Apache::lonhomework::showhash(%Apache::lonhomework::results);
495: &finalize_storage();
496: }
497: if ($target eq 'answer' && ($ENV{'request.state'} eq 'construct') ) {
498: $result.='</html>'; #normally we get it from xmlend, but in CSTR
499: # we always show answer mode too.
500: }
501: } elsif ($target eq 'meta') {
502: if ($Apache::inputtags::part eq '0') {
503: $result=&Apache::response::mandatory_part_meta;
504: }
505: } elsif ($target eq 'edit') {
506: &Apache::lonxml::debug("in end_problem with $target, edit");
507: $result = &problem_edit_footer();
508: }
509:
510: undef(%Apache::lonhomework::history);
511: undef(%Apache::lonhomework::results);
512: undef($Apache::inputtags::part);
513: undef($Apache::lonhomework::parsing_a_problem);
514:
515: return $result;
516: }
517:
518:
519: sub start_library {
520: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
521: my ($result,$head_tag_start,$body_tag_start,$form_tag_start);
522:
523: if ($target eq 'edit') {
524: ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
525: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
526: $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
527: &problem_edit_header();
528: my $temp=&Apache::edit::insertlist($target,$token);
529: $result.=$temp;
530: } elsif ($target eq 'modified') {
531: $result=$token->[4];
532: $result.=&Apache::edit::handle_insert();
533: } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
534: $ENV{'request.state'} eq "construct" ) {
535: ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
536: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
537: my $name=&get_resource_name($parstack,$safeeval);
538: my $rndseed=&setup_rndseed($safeeval);
539: $result.="$head_tag_start<title>$name</title></head>
540: $body_tag_start \n $form_tag_start".
541: '<input type="hidden" name="submitted" value="yes" />';
542: $result.=&problem_web_to_edit_header($rndseed);
543: }
544: return $result;
545: }
546:
547: sub end_library {
548: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
549: my $result='';
550: if ($target eq 'edit') {
551: $result=&problem_edit_footer();
552: } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
553: $ENV{'request.state'} eq "construct") {
554: $result.='</form></body>'.&Apache::lonxml::xmlend();
555: }
556: return $result;
557: }
558:
559: sub start_block {
560: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
561:
562: my $result;
563:
564: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
565: $target eq 'tex' || $target eq 'analyze') {
566: my $code = $token->[2]->{'condition'};
567: if ($code) {
568: if (!$Apache::lonxml::default_homework_loaded) {
569: &Apache::lonxml::default_homework_load($safeeval);
570: }
571: $result = &Apache::run::run($code,$safeeval);
572: &Apache::lonxml::debug("block :$code: returned :$result:");
573: } else {
574: $result='1';
575: }
576: if ( ! $result ) {
577: my $skip=&Apache::lonxml::get_all_text("/block",$parser);
578: &Apache::lonxml::debug("skipping ahead :$skip: $$parser[-1]");
579: }
580: $result='';
581: } elsif ($target eq 'edit') {
582: $result .=&Apache::edit::tag_start($target,$token);
583: $result .=&Apache::edit::text_arg('Test Condition:','condition',
584: $token,40);
585: $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
586: } elsif ($target eq 'modified') {
587: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
588: $safeeval,'condition');
589: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
590: }
591: return $result;
592: }
593:
594: sub end_block {
595: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
596: my $result;
597: if ($target eq "edit") {
598: $result.= &Apache::edit::tag_end($target,$token,'');
599: }
600: return $result;
601: }
602:
603: sub start_while {
604: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
605:
606: my $result;
607: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
608: $target eq 'tex' || $target eq 'analyze') {
609: my $code = $token->[2]->{'condition'};
610:
611: push( @Apache::structuretags::whileconds, $code);
612: if (!$Apache::lonxml::default_homework_loaded) {
613: &Apache::lonxml::default_homework_load($safeeval);
614: }
615: my $result = &Apache::run::run($code,$safeeval);
616: my $bodytext=&Apache::lonxml::get_all_text("/while",$parser);
617: push( @Apache::structuretags::whilebody, $bodytext);
618: push( @Apache::structuretags::whileline, $token->[5]);
619: &Apache::lonxml::debug("s code $code got -$result-");
620: if ( $result ) {
621: &Apache::lonxml::newparser($parser,\$bodytext);
622: }
623: } elsif ($target eq 'edit') {
624: $result .=&Apache::edit::tag_start($target,$token);
625: $result .=&Apache::edit::text_arg('Test Condition:','condition',
626: $token,40);
627: $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
628: } elsif ($target eq 'modified') {
629: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
630: $safeeval,'condition');
631: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
632: }
633: return $result;
634: }
635:
636: sub end_while {
637: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
638: my $result;
639:
640: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
641: $target eq 'tex' || $target eq 'analyze') {
642: my $code = pop(@Apache::structuretags::whileconds);
643: my $bodytext = pop(@Apache::structuretags::whilebody);
644: my $line = pop(@Apache::structuretags::whileline);
645: my $return = &Apache::run::run($code,$safeeval);
646: my $starttime=time;
647: my $error=0;
648: while ($return) {
649: if (time-$starttime >
650: $Apache::lonnet::perlvar{'lonScriptTimeout'}) {
651: $return = 0; $error=1; next;
652: }
653: $result.=&Apache::scripttag::xmlparse($bodytext);
654: $return = &Apache::run::run($code,$safeeval);
655: }
656: if ($error) {
657: &Apache::lonxml::error('<pre>Code ran too long. It ran for more than '.$Apache::lonnet::perlvar{'lonScriptTimeout'}.' seconds occured while running <while$gt; on line '.$line.'</pre>');
658: }
659: } elsif ($target eq "edit") {
660: $result.= &Apache::edit::tag_end($target,$token,'');
661: }
662: return $result;
663: }
664:
665: # <randomlist show="1">
666: # <tag1>..</tag1>
667: # <tag2>..</tag2>
668: # <tag3>..</tag3>
669: # ...
670: # </randomlist>
671: sub start_randomlist {
672: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
673: my $result;
674: if ($target eq 'answer' || $target eq 'grade' || $target eq 'web' ||
675: $target eq 'tex' || $target eq 'analyze') {
676: my $body= &Apache::lonxml::get_all_text("/randomlist",$parser);
677: my $b_parser= HTML::TokeParser->new(\$body);
678: my $b_tok;
679: my @randomlist;
680: my $list_item;
681: while($b_tok = $b_parser->get_token() ) {
682: if($b_tok->[0] eq 'S') { # start tag
683: # get content of the tag until matching end tag
684: # get all text upto the matching tag
685: # and push the content into @randomlist
686: $list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],
687: $b_parser);
688: $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
689: push(@randomlist,$list_item);
690: # print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4],
691: # $list_item</b>";
692: }
693: if($b_tok->[0] eq 'T') { # text
694: # what to do with text in between tags?
695: # print "<b>TEXT $b_tok->[1]</b><br />";
696: }
697: # if($b_tok->[0] eq 'E') { # end tag, should not happen
698: # print "<b>END-TAG $b_tok->[1]</b><br />";
699: # }
700: }
701: my @idx_arr = (0 .. $#randomlist);
702: &Apache::structuretags::shuffle(\@idx_arr);
703: my $bodytext = '';
704: my $show=$#randomlist;
705: my $showarg=&Apache::lonxml::get_param('show',$parstack,$safeeval);
706: $showarg--;
707: if ( ($showarg >= 0) && ($showarg < $show) ) { $show = $showarg; }
708: for(0 .. $show) {
709: $bodytext .= "$randomlist[ $idx_arr[$_] ]";
710: }
711: &Apache::lonxml::newparser($parser,\$bodytext);
712: } elsif ($target eq 'edit' ) {
713: $result .=&Apache::edit::tag_start($target,$token);
714: $result .=&Apache::edit::text_arg('Maximum Tags to Show:','show',
715: $token,5);
716: $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
717: } elsif ($target eq 'modified' ) {
718: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
719: $safeeval,'show');
720: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
721: }
722: return $result;
723: }
724:
725: sub shuffle {
726: my $a=shift;
727: my $i;
728: if (defined(@$a)) {
729: &Apache::response::setrandomnumber();
730: for($i=@$a;--$i;) {
731: my $j=int(&Math::Random::random_uniform() * ($i+1));
732: next if $i == $j;
733: @$a[$i,$j] = @$a[$j,$i];
734: }
735: }
736: }
737:
738: sub end_randomlist {
739: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
740: my $result;
741: if ($target eq 'edit' ) {
742: $result=&Apache::edit::tag_end($target,$token,
743: 'End Randomly Parsed Block');
744: }
745: return $result;
746: }
747:
748: sub start_part {
749: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
750: my $result='';
751: my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
752: if ($id eq '') { $id = $Apache::lonxml::curdepth; }
753: $Apache::inputtags::part=$id;
754: @Apache::inputtags::responselist = ();
755: @Apache::inputtags::previous=();
756: @Apache::inputtags::previous_version=();
757: my $hidden=&Apache::loncommon::check_if_partid_hidden($Apache::inputtags::part);
758:
759: if ($target eq 'meta') {
760: return &Apache::response::mandatory_part_meta;
761: } elsif ($target eq 'web' || $target eq 'grade' ||
762: $target eq 'answer' || $target eq 'tex') {
763: if ($hidden) {
764: my $bodytext=&Apache::lonxml::get_all_text("/part",$parser);
765: } else {
766: my ($status,$accessmsg) = &Apache::lonhomework::check_access($id);
767: push (@Apache::inputtags::status,$status);
768: my $expression='$external::datestatus="'.$status.'";';
769: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
770: &Apache::run::run($expression,$safeeval);
771: if ( $status eq 'CLOSED' ) {
772: my $bodytext=&Apache::lonxml::get_all_text("/part",$parser);
773: if ( $target eq "web" ) {
774: $result="<br />Part is not open to be viewed. It $accessmsg<br />";
775: } elsif ( $target eq 'tex' ) {
776: $result="\\end{minipage}\\vskip 0 mm Part is not open to be viewed. It $accessmsg \\\\\\begin{minipage}{\\textwidth}";
777: }
778: } else {
779: if ($target eq 'tex') {
780: $result.='\noindent \end{minipage}\vskip 0 mm \noindent \begin{minipage}{\textwidth}\noindent';
781: my $weight = &Apache::lonnet::EXT("resource.$id.weight");
782: if ($Apache::lonhomework::type eq 'exam') { $result .= '\fbox{\textit{'.$weight.' pt}}';}
783: }
784: }
785: }
786: } elsif ($target eq 'edit') {
787: $result.=&Apache::edit::tag_start($target,$token);
788: $result.=&Apache::edit::text_arg('Part ID:','id',$token).
789: &Apache::loncommon::help_open_topic("Part_Tag_Edit_Help").
790: &Apache::edit::end_row().&Apache::edit::start_spanning_row();
791: } elsif ($target eq 'modified') {
792: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
793: $safeeval,'id');
794: if ($constructtag) {
795: $result = &Apache::edit::rebuild_tag($token);
796: $result.=&Apache::edit::handle_insert();
797: }
798: }
799: return $result;
800: }
801:
802: sub end_part {
803: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
804: &Apache::lonxml::debug("in end_part $target ");
805: my $status=$Apache::inputtags::status['-1'];
806: my $hidden=&Apache::loncommon::check_if_partid_hidden($Apache::inputtags::part);
807: my $result='';
808: if ( $target eq 'meta' ) {
809: $result='';
810: } elsif ( $target eq 'grade' && $status eq 'CAN_ANSWER' && !$hidden) {
811: $result=&Apache::inputtags::grade;
812: } elsif (($target eq 'web' || $target eq 'tex') && !$hidden ) {
813: my $gradestatus=&Apache::inputtags::gradestatus($Apache::inputtags::part,
814: $target);
815: if ($Apache::lonhomework::type eq 'exam') {$gradestatus='';}
816: $result=$gradestatus;
817: }
818: pop @Apache::inputtags::status;
819: $Apache::inputtags::part='';
820: return $result;
821: }
822:
823: sub start_preduedate {
824: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
825: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
826: if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
827: $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' &&
828: $Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
829: &Apache::lonxml::get_all_text("/preduedate",$parser);
830: }
831: }
832: return '';
833: }
834:
835: sub end_preduedate {
836: return '';
837: }
838:
839: sub start_postanswerdate {
840: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
841: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex') {
842: if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
843: &Apache::lonxml::get_all_text("/postanswerdate",$parser);
844: }
845: } elsif ($target eq 'tex') {
846: return '\vskip 0 mm \noindent';
847: }
848: return '';
849: }
850:
851: sub end_postanswerdate {
852: return '';
853: }
854:
855: sub start_notsolved {
856: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
857: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
858: $target eq 'tex') {
859: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
860: &Apache::lonxml::debug("not solved has :$gradestatus:");
861: if ($gradestatus =~ /^correct/) {
862: &Apache::lonxml::debug("skipping");
863: &Apache::lonxml::get_all_text("/notsolved",$parser);
864: }
865: }
866: return '';
867: }
868:
869: sub end_notsolved {
870: return '';
871: }
872:
873: sub start_solved {
874: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
875: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
876: $target eq 'tex') {
877: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
878: if ($gradestatus !~ /^correct/) {
879: &Apache::lonxml::get_all_text("/solved",$parser);
880: }
881: }
882: return '';
883: }
884:
885: sub end_solved {
886: return '';
887: }
888:
889: sub start_startouttext {
890: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
891: my @result=(''.'');
892: if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
893: return (@result);
894: }
895:
896: sub end_startouttext {
897: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
898: my $result='';
899: my $text='';
900:
901: if ($target eq 'edit') {
902: $text=&Apache::lonxml::get_all_text("endouttext",$parser);
903: $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
904: <td>Delete:".
905: &Apache::edit::deletelist($target,$token)
906: ."</td>
907: <td>".
908: &Apache::edit::insertlist($target,$token).
909: &Apache::edit::end_row().
910: &Apache::edit::start_spanning_row()."\n"
911: .'<table><tr><td>'.
912: &Apache::loncommon::help_open_topic("Greek_Symbols",
913: 'Greek Symbols',
914: undef,undef,600)
915: .'</td><td>'.
916: &Apache::loncommon::help_open_topic("Other_Symbols",
917: 'Other Symbols',
918: undef,undef,600)
919: .'</td></tr></table>'.
920: &Apache::edit::editfield($token->[1],$text,"",80,4);
921: }
922: if ($target eq 'modified') {
923: $text=&Apache::lonxml::get_all_text("endouttext",$parser);
924: $result='<startouttext />'.&Apache::edit::modifiedfield();
925: }
926: if ($target eq 'tex') {
927: $result .= '\noindent ';
928: }
929: return $result;
930: }
931:
932: sub start_endouttext {
933: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
934: my $result='';
935: if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
936: if ($target eq "modified") {
937: $result='<endouttext />'.
938: &Apache::edit::handle_insertafter('startouttext'); }
939: return $result;
940: }
941:
942: sub end_endouttext {
943: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
944: my @result=('','');
945: if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
946: return (@result);
947: }
948:
949: sub delete_startouttext {
950: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
951: # my $text=&Apache::lonxml::get_all_text("endouttext",$parser);
952: my $text=$$parser['-1']->get_text("/endouttext");
953: my $ntoken=$$parser['-1']->get_token();
954: &Apache::lonxml::debug("Deleting :$text: and :$ntoken->[0]:$ntoken->[1]:$ntoken->[2]: for startouttext");
955: &Apache::lonxml::end_tag($tagstack,$parstack,$ntoken);
956: # Deleting 2 parallel tag pairs, but we need the numbers later to look like
957: # they did the last time round
958: &Apache::lonxml::increasedepth($ntoken);
959: &Apache::lonxml::decreasedepth($ntoken);
960: return 1;
961: }
962:
963: 1;
964: __END__
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