1: # The LearningOnline Network with CAPA
2: # definition of tags that give a structure to a document
3: #
4: # $Id: structuretags.pm,v 1.151 2003/02/27 20:01:05 sakharuk 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: # &Apache::lonxml::register_insert('problem','',('part','postanswerdate','preduedate'))
43: }
44:
45: sub start_web {
46: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
47: my $bodytext=&Apache::lonxml::get_all_text("/web",$parser);
48: if ($target eq 'web') {
49: return $bodytext;
50: }
51: return '';
52: }
53:
54: sub end_web {
55: return '';
56: }
57:
58: sub start_tex {
59: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
60: my $bodytext=&Apache::lonxml::get_all_text("/tex",$parser);
61: if ($target eq 'tex') {
62: return $bodytext.' ';
63: }
64: return '';
65: }
66:
67: sub end_tex {
68: return '';
69: }
70:
71: sub page_start {
72: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
73: my %found;
74: foreach my $taginside ($tagstack) {
75: foreach my $taglookedfor ('html','body','form') {
76: if ($taginside =~ /^$taglookedfor$/i) { $found{$taglookedfor} = 1; }
77: }
78: }
79:
80: my $result;
81: my $head_tag_start;
82: if (!defined($found{'html'})) {
83: $result=&Apache::londefdef::start_html($target,$token,$tagstack,$parstack,
84: $parser,$safeeval);
85: $head_tag_start='<head>'.&Apache::lonmenu::registerurl(undef,$target);
86: }
87: my $body_tag_start;
88: if (!defined($found{'body'})) {
89: $body_tag_start='<body onLoad="'.&Apache::lonmenu::loadevents().'" '.
90: 'onUnload="'.&Apache::lonmenu::unloadevents().'" ';
91: my $background=&Apache::lonxml::get_param('background',$parstack,$safeeval);
92: if ($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,$safeeval);
98: if ($bgcolor) {
99: $body_tag_start.='bgcolor="'.$bgcolor.'" ';
100: } else {
101: $body_tag_start.='bgcolor="#ffffff"';
102: }
103: }
104: $body_tag_start.='>'.&Apache::lonmenu::menubuttons(undef,$target);
105: if ($target eq 'web' && $ENV{'request.state'} ne 'construct') {
106: my ($symb)=&Apache::lonxml::whichuser();
107: if ($symb eq '') {
108: my $help = &Apache::loncommon::help_open_topic("Ambiguous_Reference");
109: $help="Browsing or <a href=\"/adm/ambiguous\">ambiguous</a> reference, submissions ignored $help<br />";
110: $body_tag_start.=$help;
111: }
112: }
113: }
114: my $form_tag_start;
115: if (!defined($found{'form'})) {
116: $form_tag_start='<form name="lonhomework" method="POST" action="'.
117: $ENV{'request.uri'}.'">';
118: }
119: return ($result,$head_tag_start,$body_tag_start,$form_tag_start);
120: }
121:
122: #use Time::HiRes();
123: sub get_resource_name {
124: my ($parstack,$safeeval)=@_;
125: my $name=&Apache::lonnet::gettitle();
126: if ($name eq '') {
127: $name=&Apache::lonnet::EXT('resource.title');
128: if ($name eq 'con_lost') { $name = ''; }
129: }
130: $Apache::lonhomework::name=$name;
131: return $name;
132: }
133:
134: sub setup_rndseed {
135: my ($safeeval)=@_;
136: my $rndseed;
137: if ($ENV{'request.state'} eq "construct") {
138: $rndseed=$ENV{'form.rndseed'};
139: if (!$rndseed) {
140: $rndseed=time;
141: $ENV{'form.rndseed'}=$rndseed;
142: }
143: &Apache::lonxml::debug("Setting rndseed to $rndseed");
144: &Apache::run::run('$external::randomseed='.$rndseed.';',$safeeval);
145: }
146: return $rndseed;
147: }
148:
149: sub problem_edit_header {
150: return '<input type="hidden" name="submitted" value="edit" />
151: <input type="hidden" name="problemmode" value="Edit" />
152: <input type="submit" name="problemmode" value="Discard Edits and View" />
153: <input type="submit" name="problemmode" value="EditXML" />
154: <input type="submit" name="Undo" value="undo" /> <hr />
155: <input type="submit" name="submit" value="Submit Changes and Edit" />
156: <input type="submit" name="submit" value="Submit Changes and View" /><br /><p> </p><table border="0"><tr><td bgcolor="#DDDDDD">
157: ';
158: }
159:
160: sub problem_edit_footer {
161: return '</td></tr></table><br /><input type="submit" name="submit" value="Submit Changes and Edit" />
162: <input type="submit" name="submit" value="Submit Changes and View" />';
163: }
164:
165: sub problem_web_to_edit_header {
166: my ($rndseed)=@_;
167: my $result.='<input type="hidden" name="problemmode" value="View" />
168: <input type="submit" name="problemmode" value="Edit" />
169: <input type="submit" name="problemmode" value="EditXML" />
170: Random Seed:<input type="text" name="rndseed" width="10" value="'.
171: $rndseed.'" />
172: <input type="submit" name="changerandseed" value="Change" />
173: <input type="submit" name="resetdata" value="Reset Submissions" />
174: <input type="checkbox" name="showallfoils" ';
175: if (defined($ENV{'form.showallfoils'})) { $result.='checked="on"'; }
176: $result.= ' /> Show All Foils
177: <hr />';
178: my $numtoanalyze=$ENV{'form.numtoanalyze'};
179: if (!$numtoanalyze) { $numtoanalyze=100; }
180: $result.= '<input type="submit" name="problemmode" value="Answer Distribution" />
181: <input type="text" name="numtoanalyze" value="'.
182: $numtoanalyze.'" size="5" /> <hr />';
183: return $result;
184: }
185:
186: sub initialize_storage {
187: %Apache::lonhomework::results=();
188: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
189: if ($ENV{'request.state'} eq 'construct') {
190: %Apache::lonhomework::history=
191: &Apache::lonnet::tmprestore($ENV{'request.uri'},'',$domain,$name);
192: my ($temp)=keys %Apache::lonhomework::history ;
193: &Apache::lonxml::debug("Return message of $temp");
194: } else {
195: %Apache::lonhomework::history=
196: &Apache::lonnet::restore($symb,$courseid,$domain,$name);
197: }
198: #ignore error conditions
199: my ($temp)=keys %Apache::lonhomework::history ;
200: if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }
201: }
202:
203: # -------------------------------------------------------------finalize_storage
204: # Stores away the result has to a student's environment
205: # checks form.grade_ for specific values, other wises stores
206: # to the running users environment
207: sub finalize_storage {
208: my $result;
209: my ($temp) = keys %Apache::lonhomework::results;
210: if ( $temp ne '' ) {
211: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
212: if ($ENV{'request.state'} eq 'construct') {
213: $result=&Apache::lonnet::tmpstore(\%Apache::lonhomework::results,
214: $ENV{'request.uri'},'',$domain,$name);
215: &Apache::lonxml::debug('Construct Store return message:'.$result);
216: } else {
217: $result=&Apache::lonnet::cstore(\%Apache::lonhomework::results,
218: $symb,$courseid,$domain,$name);
219: &Apache::lonxml::debug('Store return message:'.$result);
220: }
221: }
222: return $result;
223: }
224:
225: sub checkout_msg {
226: return (<<ENDCHECKOUT);
227: <h2>The resource needs to be checked out</h2>
228: As a resource gets checked out, a unique timestamped ID is given to it, and a
229: permanent record is left in the system.<p />
230: <font color=red>
231: Checking out resources is subject to course policies, and may exclude future
232: credit even if done erroneously.<p />
233: </font>
234: <form name="checkout" method="POST" action="$ENV{'request.uri'}">
235: <input type="hidden" name="doescheckout" value="yes" />
236: <input type="button" name="checkoutbutton" value="Check out Exam for Viewing" onClick="javascript:if (confirm('Check out Exam?')) { document.checkout.submit(); }" />
237: </form>
238: ENDCHECKOUT
239: }
240:
241: sub start_problem {
242: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
243:
244: # meta is called from lonpublisher, which doesn't uses the normal
245: # lonhomework method of parsing the file which means that inputtags
246: # won't get reset
247: if ( $Apache::inputtags::part ne '' && $target != 'meta' ) {
248: &Apache::lonxml::error('Only one problem allowed in a .problem file');
249: my $bodytext=&Apache::lonxml::get_all_text("/problem",$parser);
250: return '';
251: }
252: #intialize globals
253: $Apache::inputtags::part='0';
254: @Apache::inputtags::responselist = ();
255: @Apache::inputtags::previous=();
256: $Apache::structuretags::printanswer='No';
257: if ($target ne 'analyze') {
258: &initialize_storage();
259: if ($target eq 'web') {
260: &Apache::lonhomework::showhash(%Apache::lonhomework::history);
261: }
262: $Apache::lonhomework::type=&Apache::lonnet::EXT('resource.0.type');
263: &Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");
264: }
265: if ($Apache::lonhomework::type eq '') {
266: my $uri=$ENV{'request.uri'};
267: if ($uri=~/\.(\w+)$/) {
268: $Apache::lonhomework::type=$1;
269: &Apache::lonxml::debug("Using type of $1");
270: } else {
271: $Apache::lonhomework::type='problem';
272: &Apache::lonxml::debug("Using default type, problem, :$uri:");
273: }
274: }
275:
276: #added vars to the scripting enviroment
277: my $expression='$external::part='.$Apache::inputtags::part.';';
278: &Apache::run::run($expression,$safeeval);
279: my $status;
280: my $accessmsg;
281:
282: #should get back a <html> or the neccesary stuff to start XML/MathML
283: my ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
284: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
285: if ($target eq 'tex' and $ENV{'request.symb'} =~ m/\.page_/) { $result = '';}
286:
287: if ($target eq 'analyze') { my $rndseed=&setup_rndseed($safeeval); }
288: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
289: #handle exam checkout
290: if ($Apache::lonhomework::type eq 'exam') {
291: my $token=$Apache::lonhomework::history{"resource.0.outtoken"};
292: if (($ENV{'form.doescheckout'}) && (!$token)) {
293: $token=&Apache::lonxml::maketoken();
294: $Apache::lonhomework::history{"resource.0.outtoken"}=$token;
295: }
296: $body_tag_start.=&Apache::lonxml::printtokenheader($target,$token);
297: }
298:
299: #handle rand seed in construction space
300: my $rndseed=&setup_rndseed($safeeval);
301: ($status,$accessmsg) = &Apache::lonhomework::check_access('0');
302: push (@Apache::inputtags::status,$status);
303: my $expression='$external::datestatus="'.$status.'";';
304: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
305: &Apache::run::run($expression,$safeeval);
306: &Apache::lonxml::debug("Got $status");
307: if (( $status eq 'CLOSED' ) ||
308: ( $status eq 'UNCHECKEDOUT') ||
309: ( $status eq 'BANNED') ||
310: ( $status eq 'UNAVAILABLE')) {
311: my $bodytext=&Apache::lonxml::get_all_text("/problem",$parser);
312: if ( $target eq "web" ) {
313: $result.= $head_tag_start.'</head>';
314: my $msg=$body_tag_start;
315: if ($status eq 'UNAVAILABLE') {
316: $result.='<h1>Unable to determine if this resource is open due to network problems. Please try again later.</h1>';
317: } else {
318: $result.='<h1>Not open to be viewed</h1>';
319: }
320: if ($status eq 'CLOSED') {
321: $msg.='The problem '.$accessmsg;
322: } elsif ($status eq 'UNCHECKEDOUT') {
323: $msg.=&checkout_msg;
324: }
325: $result.=$msg.'<br />';
326: } elsif ($target eq 'tex') {
327: $result.='\begin{document}\noindent \vskip 1 mm \begin{minipage}{\textwidth}\vskip 0 mm';
328: if ($status eq 'UNAVAILABLE') {
329: $result.='Unable to determine if this resource is open due to network problems. Please try again later.\vskip 0 mm ';
330: } else {
331: $result.="Problem is not open to be viewed. It $accessmsg \\vskip 0 mm ";
332: }
333: }
334: } elsif ($target eq 'web') {
335: my $name= &get_resource_name($parstack,$safeeval);
336: if ($status eq 'CAN_ANSWER') {
337: # create a page header and exit
338: $result.="$head_tag_start<title>$name</title></head>
339: $body_tag_start \n $form_tag_start".
340: '<input type="hidden" name="submitted" value="yes" />';
341: if ($ENV{'request.state'} eq "construct") {
342: $result.= &problem_web_to_edit_header($rndseed);
343: }
344: # if we are viewing someone else preserve that info
345: if (defined $ENV{'form.grade_symb'}) {
346: foreach my $field ('symb','courseid','domain','username') {
347: $result .= '<input type="hidden" name="grade_'.$field.
348: '" value="'.$ENV{"form.grade_$field"}.'" />'."\n";
349: }
350: }
351: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER'
352: || $status eq 'CLOSED' || $status eq 'UNAVALAILABLE') {
353: $result.=$head_tag_start.
354: "<title>$name</title></head>\n$body_tag_start\n";
355: }
356: } elsif ($target eq 'tex') {
357: my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);
358: if ($name eq '') {
359: $name=&Apache::lonnet::EXT('resource.title');
360: if ($name eq 'con_lost') { $name = ''; }
361: }
362: $Apache::lonhomework::name=$name;
363: my $id = $Apache::inputtags::part;
364: my $weight = &Apache::lonnet::EXT("resource.$id.weight");
365: my $allkeys = &Apache::lonnet::metadata($ENV{'request.uri'},'keys');
366: my @allkeys = split /,/,$allkeys;
367: my $allow_print_points = 0;
368: foreach my $partial_key (@allkeys) {
369: if ($partial_key=~m/weight/) {
370: $allow_print_points++;
371: }
372: }
373: my $duedate = &Apache::lonnet::EXT("resource.$id.duedate");
374: $duedate = POSIX::strftime("%c",localtime($duedate));
375: my $temp_file;
376: my $filename = "/home/httpd/prtspool/$ENV{'user.name'}_$ENV{'user.domain'}_printout.due";
377: if (-e $filename) {
378: $temp_file = Apache::File->new($filename);
379: } else {
380: $temp_file = Apache::File->new('>>'.$filename);
381: }
382: my @due_file_content = <$temp_file>;
383: my $due_file_content = $due_file_content[$#due_file_content];
384: chomp $due_file_content;
385: if ($due_file_content ne $duedate) {
386: $temp_file = Apache::File->new('>'.$filename);
387: print $temp_file "$duedate\n";
388: if (not $ENV{'request.symb'} =~ m/\.page_/) {
389: if(not $duedate=~m/1969/ and $Apache::lonhomework::type ne 'exam') {
390: $result .= '\begin{document} \noindent\textit{Due date: '.$duedate.'} \vskip 1 mm\noindent \begin{minipage}{\textwidth}';
391: } else {
392: $result .= '\begin{document} \noindent \vskip 1 mm \noindent\begin{minipage}{\textwidth}';
393: if ($Apache::lonhomework::type eq 'exam' and $allow_print_points==1) { $result .= '\fbox{\textit{'.$weight.' pt}}';}
394: }
395: } else {
396: $result .= '\vskip 1mm\textit{Due date: '.$duedate.'} \\\\\\\\';
397: }
398: } else {
399: if (not $ENV{'request.symb'} =~ m/\.page_/) {
400: $result .= '\begin{document} \noindent \vskip 1 mm\noindent\begin{minipage}{\textwidth}';
401: if (($Apache::lonhomework::type eq 'exam') and ($allow_print_points==1)) { $result .= '\fbox{\textit{'.$weight.' pt}}';}
402: } else {
403: $result .= '\vskip 1mm \\\\\\\\';
404: }
405: }
406: }
407: } elsif ($target eq 'edit') {
408: $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
409: &problem_edit_header();
410: my $temp=&Apache::edit::insertlist($target,$token);
411: $result.=$temp;
412: } elsif ($target eq 'modified') {
413: $result=$token->[4];
414: $result.=&Apache::edit::handle_insert();
415: } else {
416: # page_start returned a starting result, delete it if we don't need it
417: $result = '';
418: }
419: return $result;
420: }
421:
422: sub end_problem {
423: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
424: my $result='';
425: my $status=$Apache::inputtags::status['-1'];
426: if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' || $target eq 'tex') {
427: if ( $target eq 'grade' && $Apache::inputtags::part eq '0' && $status eq 'CAN_ANSWER' ) {
428: # if part is zero, no <part>s existed, so we need to the grading
429: &Apache::inputtags::grade;
430: } elsif ( ($target eq 'web' || $target eq 'tex') && $Apache::inputtags::part eq '0' &&
431: $status ne 'UNCHECKEDOUT') {
432: # if part is zero, no <part>s existed, so we need show the current
433: # grading status
434: my $gradestatus = &Apache::inputtags::gradestatus($Apache::inputtags::part,$target);
435: if ($Apache::lonhomework::type ne 'exam') {$result.= $gradestatus;}
436: }
437: if (
438: (($target eq 'web') && ($ENV{'request.state'} ne 'construct')) ||
439: ($target eq 'answer') || ($target eq 'tex')
440: ) {
441: if ($status eq 'CAN_ANSWER') {
442: if ($target ne 'tex') {
443: $result.="</form></body>\n";
444: }
445: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' ||
446: $status eq 'UNCHECKEDOUT' ) {
447: if ($target ne 'tex') {
448: $result.="</body>\n";
449: }
450: }
451: if ($target eq 'web') {
452: $result.=&Apache::lonxml::xmlend();
453: } elsif ($target eq 'tex') {
454: $result .= '\vskip 0.5mm\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}';
455: if (not $ENV{'request.symb'} =~ m/\.page_/) {
456: $result .= '\end{minipage}\end{document} ';
457: } else {
458: $result .= '';
459: }
460: }
461: }
462: if ($target eq 'grade') {
463: &Apache::lonhomework::showhash(%Apache::lonhomework::results);
464: &finalize_storage();
465: }
466: if ($target eq 'answer' && ($ENV{'request.state'} eq 'construct') ) {
467: $result.='</html>'; #normally we get it from xmlend, but in CSTR
468: # we always show answer mode too.
469: }
470: } elsif ($target eq 'meta') {
471: if ($Apache::inputtags::part eq '0') {
472: $result=&Apache::response::mandatory_part_meta;
473: }
474: } elsif ($target eq 'edit') {
475: &Apache::lonxml::debug("in end_problem with $target, edit");
476: $result = &problem_edit_footer();
477: }
478: return $result;
479: }
480:
481:
482: sub start_library {
483: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
484: my ($result,$head_tag_start,$body_tag_start,$form_tag_start);
485:
486: if ($target eq 'edit') {
487: ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
488: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
489: $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
490: &problem_edit_header();
491: my $temp=&Apache::edit::insertlist($target,$token);
492: $result.=$temp;
493: } elsif ($target eq 'modified') {
494: $result=$token->[4];
495: $result.=&Apache::edit::handle_insert();
496: } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
497: $ENV{'request.state'} eq "construct" ) {
498: ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
499: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
500: my $name=&get_resource_name($parstack,$safeeval);
501: my $rndseed=&setup_rndseed($safeeval);
502: $result.="$head_tag_start<title>$name</title></head>
503: $body_tag_start \n $form_tag_start".
504: '<input type="hidden" name="submitted" value="yes" />';
505: $result.=&problem_web_to_edit_header($rndseed);
506: }
507: return $result;
508: }
509:
510: sub end_library {
511: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
512: my $result='';
513: if ($target eq 'edit') {
514: $result=&problem_edit_footer();
515: } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
516: $ENV{'request.state'} eq "construct") {
517: $result.='</form></body>'.&Apache::lonxml::xmlend();
518: }
519: return $result;
520: }
521:
522: sub start_block {
523: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
524:
525: my $result;
526:
527: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
528: $target eq 'tex' || $target eq 'analyze') {
529: my $code = @$parstack[$#$parstack];
530: if ($code) {
531: $code =~ s/\"//g;
532: $code .=';return $condition;';
533: if (!$Apache::lonxml::default_homework_loaded) {
534: &Apache::lonxml::default_homework_load($safeeval);
535: }
536: $result = &Apache::run::run($code,$safeeval);
537: &Apache::lonxml::debug("block :$code: returned :$result:");
538: } else {
539: $result='1';
540: }
541: if ( ! $result ) {
542: my $skip=&Apache::lonxml::get_all_text("/block",$parser);
543: &Apache::lonxml::debug("skipping ahead :$skip: $$parser[-1]");
544: }
545: $result='';
546: } elsif ($target eq 'edit') {
547: $result .=&Apache::edit::tag_start($target,$token);
548: $result .=&Apache::edit::text_arg('Test Condition:','condition',
549: $token,40);
550: $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
551: } elsif ($target eq 'modified') {
552: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
553: $safeeval,'condition');
554: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
555: }
556: return $result;
557: }
558:
559: sub end_block {
560: return '';
561: }
562:
563: sub start_while {
564: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
565:
566: my $code = @$parstack[$#$parstack];
567: $code =~ s/\"//g;
568: $code .=';return $condition;';
569:
570: push( @Apache::structuretags::whileconds, $code);
571: if (!$Apache::lonxml::default_homework_loaded) {
572: &Apache::lonxml::default_homework_load($safeeval);
573: }
574: my $result = &Apache::run::run($code,$safeeval);
575: my $bodytext=$$parser[$#$parser]->get_text("/while");
576: push( @Apache::structuretags::whilebody, $bodytext);
577: if ( $result ) {
578: &Apache::lonxml::newparser($parser,\$bodytext);
579: }
580: return "";
581: }
582:
583: sub end_while {
584: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
585: my $code = pop @Apache::structuretags::whileconds;
586: my $bodytext = pop @Apache::structuretags::whilebody;
587: my $result = &Apache::run::run($code,$safeeval);
588: if ( $result ) {
589: &Apache::lonxml::newparser($parser,\$bodytext);
590: }
591: return "";
592: }
593:
594: # <randomlist show="1">
595: # <tag1>..</tag1>
596: # <tag2>..</tag2>
597: # <tag3>..</tag3>
598: # ...
599: # </randomlist>
600: sub start_randomlist {
601: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
602: my $result;
603: if ($target eq 'answer' || $target eq 'grade' || $target eq 'web' ||
604: $target eq 'tex' || $target eq 'analyze') {
605: my $body= &Apache::lonxml::get_all_text("/randomlist",$parser);
606: my $b_parser= HTML::TokeParser->new(\$body);
607: my $b_tok;
608: my @randomlist;
609: my $list_item;
610: while($b_tok = $b_parser->get_token() ) {
611: if($b_tok->[0] eq 'S') { # start tag
612: # get content of the tag until matching end tag
613: # get all text upto the matching tag
614: # and push the content into @randomlist
615: $list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
616: $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
617: push(@randomlist,$list_item);
618: # print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4], $list_item</b>";
619: }
620: if($b_tok->[0] eq 'T') { # text
621: # what to do with text in between tags?
622: # print "<b>TEXT $b_tok->[1]</b><br />";
623: }
624: # if($b_tok->[0] eq 'E') { # end tag, should not happen
625: # print "<b>END-TAG $b_tok->[1]</b><br />";
626: # }
627: }
628: my @idx_arr = (0 .. $#randomlist);
629: &Apache::structuretags::shuffle(\@idx_arr);
630: my $bodytext = '';
631: my $show=$#randomlist;
632: my $showarg=&Apache::lonxml::get_param('show',$parstack,$safeeval);
633: $showarg--;
634: if ( ($showarg >= 0) && ($showarg < $show) ) { $show = $showarg; }
635: for(0 .. $show) {
636: $bodytext .= "$randomlist[ $idx_arr[$_] ]";
637: }
638: &Apache::lonxml::newparser($parser,\$bodytext);
639: } elsif ($target eq 'edit' ) {
640: $result .= &Apache::edit::tag_start($target,$token);
641: $result .= &Apache::edit::text_arg('Maximum Tags to Show:','show',$token,5);
642: $result .= &Apache::edit::end_row().&Apache::edit::start_spanning_row();
643: } elsif ($target eq 'modified' ) {
644: my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,
645: 'show');
646: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
647: }
648: return $result;
649: }
650:
651: sub shuffle {
652: my $a=shift;
653: my $i;
654: if (defined(@$a)) {
655: &Apache::response::setrandomnumber();
656: for($i=@$a;--$i;) {
657: my $j=int(&Math::Random::random_uniform() * ($i+1));
658: next if $i == $j;
659: @$a[$i,$j] = @$a[$j,$i];
660: }
661: }
662: }
663:
664: sub end_randomlist {
665: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
666: my $result;
667: if ($target eq 'edit' ) {
668: $result=&Apache::edit::tag_end($target,$token,'End Randomly Parsed Block');
669: }
670: return $result;
671: }
672:
673: sub start_part {
674: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
675: my $result='';
676: my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
677: if ($id eq '') { $id = $Apache::lonxml::curdepth; }
678: $Apache::inputtags::part=$id;
679: @Apache::inputtags::responselist = ();
680: @Apache::inputtags::previous=();
681: my $hidden=&Apache::loncommon::check_if_partid_hidden($Apache::inputtags::part);
682:
683: if ($target eq 'meta') {
684: return &Apache::response::mandatory_part_meta;
685: } elsif ($target eq 'web' || $target eq 'grade' ||
686: $target eq 'answer' || $target eq 'tex') {
687: if ($hidden) {
688: my $bodytext=&Apache::lonxml::get_all_text("/part",$parser);
689: } else {
690: my ($status,$accessmsg) = &Apache::lonhomework::check_access($id);
691: push (@Apache::inputtags::status,$status);
692: my $expression='$external::datestatus="'.$status.'";';
693: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
694: &Apache::run::run($expression,$safeeval);
695: if ( $status eq 'CLOSED' ) {
696: my $bodytext=&Apache::lonxml::get_all_text("/part",$parser);
697: if ( $target eq "web" ) {
698: $result="<br />Part is not open to be viewed. It $accessmsg<br />";
699: } elsif ( $target eq 'tex' ) {
700: $result="\\end{minipage}\\vskip 0 mm Part is not open to be viewed. It $accessmsg \\\\\\begin{minipage}{\\textwidth}";
701: }
702: } else {
703: if ($target eq 'tex') {
704: $result.='\noindent \end{minipage}\vskip 0 mm \noindent \begin{minipage}{\textwidth}\noindent';
705: my $weight = &Apache::lonnet::EXT("resource.$id.weight");
706: if ($Apache::lonhomework::type eq 'exam') { $result .= '\fbox{\textit{'.$weight.' pt}}';}
707: }
708: }
709: }
710: } elsif ($target eq 'edit') {
711: $result.=&Apache::edit::tag_start($target,$token);
712: $result.=&Apache::edit::text_arg('Part ID:','id',$token).
713: &Apache::loncommon::help_open_topic("Part_Tag_Edit_Help").
714: &Apache::edit::end_row().&Apache::edit::start_spanning_row();
715:
716: } elsif ($target eq 'modified') {
717: my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,
718: 'id');
719: if ($constructtag) {
720: $result = &Apache::edit::rebuild_tag($token);
721: $result.=&Apache::edit::handle_insert();
722: }
723: }
724: return $result;
725: }
726:
727: sub end_part {
728: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
729: &Apache::lonxml::debug("in end_part $target ");
730: my $status=$Apache::inputtags::status['-1'];
731: my $hidden=&Apache::loncommon::check_if_partid_hidden($Apache::inputtags::part);
732: my $result='';
733: if ( $target eq 'meta' ) {
734: $result='';
735: } elsif ( $target eq 'grade' && $status eq 'CAN_ANSWER' && !$hidden) {
736: $result=&Apache::inputtags::grade;
737: } elsif (($target eq 'web' || $target eq 'tex') && !$hidden ) {
738: my $gradestatus=&Apache::inputtags::gradestatus($Apache::inputtags::part,
739: $target);
740: if ($Apache::lonhomework::type eq 'exam') {$gradestatus='';}
741: $result=$gradestatus;
742: }
743: pop @Apache::inputtags::status;
744: return $result;
745: }
746:
747: sub start_preduedate {
748: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
749: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
750: if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
751: $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' &&
752: $Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
753: &Apache::lonxml::get_all_text("/preduedate",$parser);
754: }
755: }
756: return '';
757: }
758:
759: sub end_preduedate {
760: return '';
761: }
762:
763: sub start_postanswerdate {
764: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
765: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex') {
766: if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
767: &Apache::lonxml::get_all_text("/postanswerdate",$parser);
768: }
769: } elsif ($target eq 'tex') {
770: return '\vskip 0 mm \noindent';
771: }
772: return '';
773: }
774:
775: sub end_postanswerdate {
776: return '';
777: }
778:
779: sub start_notsolved {
780: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
781: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
782: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
783: &Apache::lonxml::debug("not solved has :$gradestatus:");
784: if ($gradestatus =~ /^correct/) {
785: &Apache::lonxml::debug("skipping");
786: &Apache::lonxml::get_all_text("/notsolved",$parser);
787: }
788: }
789: return '';
790: }
791:
792: sub end_notsolved {
793: return '';
794: }
795:
796: sub start_solved {
797: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
798: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
799: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
800: if ($gradestatus !~ /^correct/) {
801: &Apache::lonxml::get_all_text("/solved",$parser);
802: }
803: }
804: return '';
805: }
806:
807: sub end_solved {
808: return '';
809: }
810:
811: sub start_startouttext {
812: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
813: my @result=(''.'');
814: if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
815: return (@result);
816: }
817: sub end_startouttext {
818: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
819: my $result='';
820: my $text='';
821:
822: if ($target eq 'edit') {
823: $text=&Apache::lonxml::get_all_text("endouttext",$parser);
824: $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
825: <td>Delete:".
826: &Apache::edit::deletelist($target,$token)
827: ."</td>
828: <td>".
829: &Apache::edit::insertlist($target,$token).
830: &Apache::edit::end_row().&Apache::edit::start_spanning_row()."\n"
831: .'<table><tr><td>'.
832: &Apache::loncommon::help_open_topic("Greek_Symbols",'Greek Symbols',
833: undef,undef,600)
834: .'</td><td>'.
835: &Apache::loncommon::help_open_topic("Other_Symbols",'Other Symbols',
836: undef,undef,600)
837: .'</td></tr></table>'.
838: &Apache::edit::editfield($token->[1],$text,"",80,4);
839: }
840: if ($target eq 'modified') {
841: $text=&Apache::lonxml::get_all_text("endouttext",$parser);
842: $result='<startouttext />'.&Apache::edit::modifiedfield();
843: }
844: if ($target eq 'tex') {
845: $result .= '\noindent ';
846: }
847: return $result;
848: }
849: sub start_endouttext {
850: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
851: my $result='';
852: if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
853: if ($target eq "modified") {
854: $result='<endouttext />'.
855: &Apache::edit::handle_insertafter('startouttext'); }
856: return $result;
857: }
858: sub end_endouttext {
859: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
860: my @result=('','');
861: if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
862: return (@result);
863: }
864: sub delete_startouttext {
865: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
866: # my $text=&Apache::lonxml::get_all_text("endouttext",$parser);
867: my $text=$$parser['-1']->get_text("/endouttext");
868: my $ntoken=$$parser['-1']->get_token();
869: &Apache::lonxml::debug("Deleting :$text: and :$ntoken->[0]:$ntoken->[1]:$ntoken->[2]: for startouttext");
870: &Apache::lonxml::end_tag($tagstack,$parstack,$ntoken);
871: # Deleting 2 parallel tag pairs, but we need the numbers later to look like
872: # they did the last time round
873: &Apache::lonxml::increasedepth($ntoken);
874: &Apache::lonxml::decreasedepth($ntoken);
875: return 1;
876: }
877:
878: 1;
879: __END__
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