1: # The LearningOnline Network with CAPA
2: # various response type definitons response definition
3: #
4: # $Id: response.pm,v 1.184 2007/11/13 11:06:54 foxr 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:
29: package Apache::response;
30: use strict;
31: use Apache::lonlocal;
32: use Apache::lonnet;
33: use Apache::lonmaxima();
34:
35: BEGIN {
36: &Apache::lonxml::register('Apache::response',('responseparam','parameter','dataresponse','customresponse','mathresponse'));
37: }
38:
39: sub start_response {
40: my ($parstack,$safeeval)=@_;
41: my $id = &Apache::lonxml::get_id($parstack,$safeeval);
42: if ($#Apache::inputtags::import > -1) {
43: &Apache::lonxml::debug("Turning :$id: into");
44: $id = join('_',@Apache::inputtags::import).'_'.$id;
45: &Apache::lonxml::debug("New :$id:");
46: }
47: push (@Apache::inputtags::response,$id);
48: push (@Apache::inputtags::responselist,$id);
49: @Apache::inputtags::inputlist=();
50: if ($Apache::inputtags::part eq '' &&
51: !$Apache::lonhomework::ignore_response_errors) {
52: &Apache::lonxml::error(&HTML::Entities::encode(&mt("Found a <*response> outside of a <part> in a <part>ed problem"),'<>&"'));
53: }
54: if ($Apache::inputtags::response_with_no_part &&
55: $Apache::inputtags::part ne '0') {
56: &Apache::lonxml::error(&HTML::Entities::encode(&mt("<*response>s are both inside of <part> and outside of <part>, this is not a valid problem, errors in grading may occur."),'<>&"').'<br />');
57: }
58: if ($Apache::inputtags::part eq '0') {
59: $Apache::inputtags::response_with_no_part=1;
60: }
61: return $id;
62: }
63:
64: sub end_response {
65: #pop @Apache::inputtags::response;
66: @Apache::inputtags::inputlist=();
67: return '';
68: }
69:
70: sub start_hintresponse {
71: my ($parstack,$safeeval)=@_;
72: my $id = &Apache::lonxml::get_id($parstack,$safeeval);
73: push (@Apache::inputtags::hint,$id);
74: push (@Apache::inputtags::hintlist,$id);
75: push (@Apache::inputtags::paramstack,[%Apache::inputtags::params]);
76: return $id;
77: }
78:
79: sub end_hintresponse {
80: pop @Apache::inputtags::hint;
81: if (defined($Apache::inputtags::paramstack[-1])) {
82: %Apache::inputtags::params=
83: @{ pop(@Apache::inputtags::paramstack) };
84: }
85: return '';
86: }
87:
88: my @randomseeds;
89: sub pushrandomnumber {
90: my $rand_alg=&Apache::lonnet::get_rand_alg();
91: if (!$rand_alg || $rand_alg eq '32bit' || $rand_alg eq '64bit' ||
92: $rand_alg eq '64bit2') {
93: # do nothing
94: } else {
95: my @seed=&Math::Random::random_get_seed();
96: push(@randomseeds,\@seed);
97: }
98: &Apache::response::setrandomnumber(@_);
99: }
100: sub poprandomnumber {
101: my $rand_alg=&Apache::lonnet::get_rand_alg();
102: if (!$rand_alg || $rand_alg eq '32bit' || $rand_alg eq '64bit' ||
103: $rand_alg eq '64bit2') {
104: return;
105: }
106: my $seed=pop(@randomseeds);
107: if ($seed) {
108: &Math::Random::random_set_seed(@$seed);
109: } else {
110: &Apache::lonxml::error("Unable to restore random algorithm.");
111: }
112: }
113:
114: sub setrandomnumber {
115: my ($ignore_id2) = @_;
116: my $rndseed;
117: $rndseed=&Apache::structuretags::setup_rndseed();
118: if (!defined($rndseed)) { $rndseed=&Apache::lonnet::rndseed(); }
119: &Apache::lonxml::debug("randseed $rndseed");
120: # $rndseed=unpack("%32i",$rndseed);
121: my $rand_alg=&Apache::lonnet::get_rand_alg();
122: my ($rndmod,$rndmod2);
123:
124: my ($id1,$id2,$shift_amt);
125: if ($Apache::lonhomework::parsing_a_problem) {
126: $id1=$Apache::inputtags::part;
127: if (defined($Apache::inputtags::response[-1])) {
128: $id2=$Apache::inputtags::response[-1];
129: }
130: $shift_amt=scalar(@Apache::inputtags::responselist);
131: } elsif ($Apache::lonhomework::parsing_a_task) {
132: $id1=&Apache::bridgetask::get_dim_id();
133: if (!$ignore_id2 && ref($Apache::bridgetask::instance{$id1})) {
134: $id2=$Apache::bridgetask::instance{$id1}[-1];
135: $shift_amt=scalar(@{$Apache::bridgetask::instance{$id1}});
136: } else {
137: $shift_amt=0;
138: }
139: }
140: &Apache::lonxml::debug("id1: $id1, id2: $id2, shift_amt: $shift_amt");
141: if (!$rand_alg || $rand_alg eq '32bit' || $rand_alg eq '64bit' ||
142: $rand_alg eq '64bit2') {
143: $rndmod=(&Apache::lonnet::numval($id1) << 10);
144: if (defined($id2)) { $rndmod+=&Apache::lonnet::numval($id2); }
145: } elsif ($rand_alg eq '64bit3') {
146: $rndmod=(&Apache::lonnet::numval2($id1) << 10);
147: if (defined($id2)) { $rndmod+=&Apache::lonnet::numval2($id2); }
148: } elsif ($rand_alg eq '64bit4') {
149: my $shift=(4*$shift_amt)%30;
150: $rndmod=(&Apache::lonnet::numval3($id1) << (($shift+15)%30));
151: if (defined($id2)) {
152: $rndmod+=(&Apache::lonnet::numval3($id2) << $shift );
153: }
154: } else {
155: ($rndmod,$rndmod2)=&Apache::lonnet::digest("$id1,$id2");
156: }
157:
158: if ($rndseed =~/([,:])/) {
159: my $char=$1;
160: use integer;
161: my ($num1,$num2)=split(/\Q$char\E/,$rndseed);
162: $num1+=$rndmod;
163: $num2+= ((defined($rndmod2)) ? $rndmod2 : $rndmod);
164: if($Apache::lonnet::_64bit) { $num1=(($num1<<32)>>32); $num2=(($num2<<32)>>32); }
165: $rndseed=$num1.$char.$num2;
166: } else {
167: $rndseed+=$rndmod;
168: if($Apache::lonnet::_64bit) {
169: use integer;
170: $rndseed=(($rndseed<<32)>>32);
171: }
172: }
173: &Apache::lonxml::debug("randseed $rndmod $rndseed");
174: &Apache::lonnet::setup_random_from_rndseed($rndseed);
175: return '';
176: }
177:
178: sub meta_parameter_write {
179: my ($name,$type,$default,$display)=@_;
180: my $partref=$Apache::inputtags::part;
181: my $result='<parameter part="'.$Apache::inputtags::part.'"';
182: if (defined($Apache::inputtags::response[-1])) {
183: $result.= ' id="'.$Apache::inputtags::response[-1].'"';
184: $partref.='_'.$Apache::inputtags::response[-1];
185: }
186: $result.= ' name="'.$name.'"'.
187: ' type="'.$type.'"'.
188: (defined($default)?' default="'.$default.'"':'').
189: (defined($display)?' display="'.$display.' [Part: '.$partref.']"':'')
190: .'></parameter>'
191: ."\n";
192: return $result;
193: }
194:
195: sub meta_package_write {
196: my $name=shift;
197: my $result = '<parameter part="'.$Apache::inputtags::part.'"';
198: if(defined($Apache::inputtags::response[-1])) {
199: $result.= ' id="'.$Apache::inputtags::response[-1].'"';
200: }
201: $result.=' package="'.$name.'"></parameter>'."\n";
202: return $result;
203: }
204:
205: sub meta_stores_write {
206: my ($name,$type,$display)=@_;
207: my $partref=$Apache::inputtags::part;
208: my $result = '<stores part="'.$Apache::inputtags::part.'"';
209: if (defined($Apache::inputtags::response[-1])) {
210: $result.= ' id="'.$Apache::inputtags::response[-1].'"';
211: $partref.='_'.$Apache::inputtags::response[-1];
212: }
213: $result.= ' name="'.$name.'"'.
214: ' type="'.$type.'"'.
215: ' display="'.$display.' [Part: '.$partref.']"'.
216: "></stores>\n";
217: }
218:
219: sub mandatory_part_meta {
220: #
221: # Autogenerate metadata for mandatory
222: # input (from RAT or lonparmset) and
223: # output (to lonspreadsheet)
224: # of each part
225: #
226: return
227: # &meta_parameter_write('opendate','date_start','',
228: # 'Opening Date').
229: # &meta_parameter_write('duedate','date_end','',
230: # 'Due Date').
231: # &meta_parameter_write('answerdate','date_start','',
232: # 'Show Answer Date').
233: # &meta_parameter_write('weight','int_zeropos','',
234: # 'Available Points').
235: # &meta_parameter_write('maxtries','int_pos','',
236: # 'Maximum Number of Tries').
237: &meta_package_write('part').
238: &meta_stores_write('solved','string',
239: 'Problem Status').
240: &meta_stores_write('tries','int_zeropos',
241: 'Number of Attempts').
242: &meta_stores_write('awarded','float',
243: 'Partial Credit Factor');
244: #
245: # Note: responseid-specific data 'submission' and 'awarddetail'
246: # not available to spreadsheet -> skip here
247: #
248: }
249:
250: sub meta_part_order {
251: if (@Apache::inputtags::partlist) {
252: my @parts=@Apache::inputtags::partlist;
253: shift(@parts);
254: return '<partorder>'.join(',',@parts).'</partorder>'."\n";
255: } else {
256: return '<partorder>0</partorder>'."\n";
257: }
258: }
259:
260: sub meta_response_order {
261: if (@Apache::inputtags::responselist) {
262: return '<responseorder>'.join(',',@Apache::inputtags::responselist).
263: '</responseorder>'."\n";
264: }
265: }
266:
267: sub check_for_previous {
268: my ($curresponse,$partid,$id,$last) = @_;
269: my %previous;
270: $previous{'used'} = 0;
271: foreach my $key (sort(keys(%Apache::lonhomework::history))) {
272: if ($key =~ /resource\.$partid\.$id\.submission$/) {
273: if ( $last && $key =~ /^(\d+):/ ) {
274: next if ($1 >= $last);
275: }
276: &Apache::lonxml::debug("Trying $key");
277: my $pastresponse=$Apache::lonhomework::history{$key};
278: if ($pastresponse eq $curresponse) {
279: $previous{'used'} = 1;
280: my $history;
281: if ( $key =~ /^(\d+):/ ) {
282: $history=$1;
283: $previous{'award'} = $Apache::lonhomework::history{"$history:resource.$partid.$id.awarddetail"};
284: $previous{'last'}='0';
285: push(@{ $previous{'version'} },$history);
286: } else {
287: $previous{'award'} = $Apache::lonhomework::history{"resource.$partid.$id.awarddetail"};
288: $previous{'last'}='1';
289: }
290: if (! $previous{'award'} ) { $previous{'award'} = 'UNKNOWN'; }
291: &Apache::lonxml::debug("got a match :$previous{'award'}:$previous{'used'}:");
292: }
293: }
294: }
295: &Apache::lonhomework::showhash(%previous);
296: return %previous;
297: }
298:
299: sub handle_previous {
300: my ($previous,$ad)=@_;
301: if ($$previous{'used'} && ($$previous{'award'} eq $ad) ) {
302: if ($$previous{'last'}) {
303: push(@Apache::inputtags::previous,'PREVIOUSLY_LAST');
304: push(@Apache::inputtags::previous_version,$$previous{'version'});
305: } elsif ($Apache::lonhomework::type ne 'survey') {
306: push(@Apache::inputtags::previous,'PREVIOUSLY_USED');
307: push(@Apache::inputtags::previous_version,$$previous{'version'});
308: }
309: }
310: }
311:
312: sub view_or_modify {
313: my ($symb,$courseid,$domain,$name) = &Apache::lonnet::whichuser();
314: my $myself=0;
315: if ( ($name eq $env{'user.name'}) && ($domain eq $env{'user.domain'}) ) {
316: $myself=1;
317: }
318: my $vgr=&Apache::lonnet::allowed('vgr',$courseid);
319: my $mgr=&Apache::lonnet::allowed('vgr',$courseid);
320: if ($mgr) { return "M"; }
321: if ($vgr) { return "V"; }
322: if ($myself) { return "V"; }
323: return '';
324: }
325:
326: sub start_dataresponse {
327: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
328: my $id = &Apache::response::start_response($parstack,$safeeval);
329: my $result;
330: if ($target eq 'web') {
331: $result = $token->[2]->{'display'}.':';
332: } elsif ($target eq 'meta') {
333: $result = &Apache::response::meta_stores_write($token->[2]->{'name'},
334: $token->[2]->{'type'},
335: $token->[2]->{'display'});
336: $result .= &Apache::response::meta_package_write('dataresponse');
337: }
338: return $result;
339: }
340:
341: sub end_dataresponse {
342: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
343: my $result;
344: if ( $target eq 'web' ) {
345: } elsif ($target eq 'grade' ) {
346: if ( defined $env{'form.submitted'}) {
347: my ($symb,$courseid,$domain,$name)=&Apache::lonnet::whichuser();
348: my $allowed=&Apache::lonnet::allowed('mgr',$courseid);
349: if ($allowed) {
350: &Apache::response::setup_params('dataresponse',$safeeval);
351: my $partid = $Apache::inputtags::part;
352: my $id = $Apache::inputtags::response['-1'];
353: my $response = $env{'form.HWVAL_'.$id};
354: my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval);
355: if ( $response =~ /[^\s]/) {
356: $Apache::lonhomework::results{"resource.$partid.$id.$name"}=$response;
357: $Apache::lonhomework::results{"resource.$partid.$id.submission"}=$response;
358: $Apache::lonhomework::results{"resource.$partid.$id.awarddetail"}='SUBMITTED';
359: }
360: } else {
361: $result='Not Permitted to change values.'
362: }
363: }
364: }
365: &Apache::response::end_response;
366: return $result;
367: }
368:
369: sub start_customresponse {
370: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
371: my $id = &Apache::response::start_response($parstack,$safeeval);
372: push(@Apache::lonxml::namespace,'customresponse');
373: my $result;
374: @Apache::response::custom_answer=();
375: @Apache::response::custom_answer_type=();
376: &Apache::lonxml::register('Apache::response',('answer'));
377: if ($target eq 'web') {
378: if ( &Apache::response::show_answer() ) {
379: my $answer = &Apache::lonxml::get_param('answerdisplay',$parstack,
380: $safeeval);
381: $Apache::inputtags::answertxt{$id}=[$answer];
382: }
383: } elsif ($target eq 'edit') {
384: $result.=&Apache::edit::tag_start($target,$token);
385: $result.=&Apache::edit::text_arg('String to display for answer:',
386: 'answerdisplay',$token);
387: $result.=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
388: } elsif ($target eq 'modified') {
389: my $constructtag;
390: $constructtag=&Apache::edit::get_new_args($token,$parstack,
391: $safeeval,'answerdisplay');
392: if ($constructtag) {
393: $result = &Apache::edit::rebuild_tag($token);
394: }
395: } elsif ($target eq 'answer' || $target eq 'grade') {
396: &Apache::response::reset_params();
397: } elsif ($target eq 'meta') {
398: $result .= &Apache::response::meta_package_write('customresponse');
399: }
400: return $result;
401: }
402:
403: sub end_customresponse {
404: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
405: my $result;
406: my $part=$Apache::inputtags::part;
407: my $id=$Apache::inputtags::response[-1];
408: if ( $target eq 'grade' && &Apache::response::submitted() ) {
409: my $response = &Apache::response::getresponse();
410: if ($Apache::lonhomework::type eq 'exam' ||
411: &Apache::response::submitted('scantron')) {
412: &Apache::response::scored_response($part,$id);
413: } elsif ( $response =~ /[^\s]/ &&
414: $Apache::response::custom_answer_type[-1] eq 'loncapa/perl') {
415: if (!$Apache::lonxml::default_homework_loaded) {
416: &Apache::lonxml::default_homework_load($safeeval);
417: }
418: my %previous = &Apache::response::check_for_previous($response,
419: $part,$id);
420: $Apache::lonhomework::results{"resource.$part.$id.submission"}=
421: $response;
422: my $error;
423: ${$safeeval->varglob('LONCAPA::customresponse_submission')}=
424: $response;
425:
426: my $award = &Apache::run::run('{ my $submission=$LONCAPA::customresponse_submission;'.$Apache::response::custom_answer[-1].'}',$safeeval);
427: if (!&Apache::inputtags::valid_award($award)) {
428: $error = $award;
429: $award = 'ERROR';
430: }
431: &Apache::response::handle_previous(\%previous,$award);
432: $Apache::lonhomework::results{"resource.$part.$id.awarddetail"}=
433: $award;
434: if ($error) {
435: $Apache::lonhomework::results{"resource.$part.$id.awardmsg"}=
436: $error;
437: }
438: }
439: } elsif ( $target eq 'answer') {
440: $result = &Apache::response::answer_header('customresponse');
441: my $answer = &Apache::lonxml::get_param('answerdisplay',$parstack,
442: $safeeval);
443: if ($env{'form.answer_output_mode'} ne 'tex') {
444: $answer = '<b>'.$answer.'</b>';
445: }
446: $result .= &Apache::response::answer_part('customresponse',$answer);
447: $result .= &Apache::response::answer_footer('customresponse');
448: }
449: if ($target eq 'web') {
450: &setup_prior_tries_hash(\&format_prior_response_math);
451: }
452: if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ||
453: $target eq 'tex' || $target eq 'analyze') {
454: &Apache::lonxml::increment_counter(&Apache::response::repetition(),
455: "$part.$id");
456: if ($target eq 'analyze') {
457: &Apache::lonhomework::set_bubble_lines();
458: }
459: }
460: pop(@Apache::lonxml::namespace);
461: pop(@Apache::response::custom_answer);
462: pop(@Apache::response::custom_answer_type);
463: &Apache::lonxml::deregister('Apache::response',('answer'));
464: &Apache::response::end_response();
465: return $result;
466: }
467:
468: sub format_prior_response_custom {
469: my ($mode,$answer) =@_;
470: return '<span class="LC_prior_custom">'.
471: &HTML::Entities::encode($answer,'"<>&').'</span>';
472: }
473:
474: sub start_mathresponse {
475: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
476: my $id = &Apache::response::start_response($parstack,$safeeval);
477: push(@Apache::lonxml::namespace,'mathresponse');
478: my $result;
479: @Apache::response::custom_answer=();
480: @Apache::response::custom_answer_type=();
481: &Apache::lonxml::register('Apache::response',('answer'));
482: if ($target eq 'web') {
483: if ( &Apache::response::show_answer() ) {
484: my $answer = &Apache::lonxml::get_param('answerdisplay',$parstack,
485: $safeeval);
486: $Apache::inputtags::answertxt{$id}=[$answer];
487: }
488: } elsif ($target eq 'edit') {
489: $result.=&Apache::edit::tag_start($target,$token);
490: $result.=&Apache::edit::text_arg('String to display for answer:',
491: 'answerdisplay',$token);
492: $result.=&Apache::edit::select_arg('Algebra System:',
493: 'cas',
494: ['maxima'],
495: $token);
496: $result.=&Apache::edit::text_arg('Argument Array:',
497: 'args',$token);
498: $result.=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
499: } elsif ($target eq 'modified') {
500: my $constructtag;
501: $constructtag=&Apache::edit::get_new_args($token,$parstack,
502: $safeeval,'answerdisplay','cas','args');
503: if ($constructtag) {
504: $result = &Apache::edit::rebuild_tag($token);
505: }
506: } elsif ($target eq 'answer' || $target eq 'grade') {
507: &Apache::response::reset_params();
508: } elsif ($target eq 'meta') {
509: $result .= &Apache::response::meta_package_write('mathresponse');
510: }
511: return $result;
512: }
513:
514: sub end_mathresponse {
515: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
516: my $result;
517: my $part=$Apache::inputtags::part;
518: my $id=$Apache::inputtags::response[-1];
519: if ( $target eq 'grade' && &Apache::response::submitted() ) {
520: my $response = &Apache::response::getresponse();
521: if ( $response =~ /[^\s]/ ) {
522: if (!$Apache::lonxml::default_homework_loaded) {
523: &Apache::lonxml::default_homework_load($safeeval);
524: }
525: my %previous = &Apache::response::check_for_previous($response,
526: $part,$id);
527: $Apache::lonhomework::results{"resource.$part.$id.submission"}=
528: $response;
529: my $error;
530: my $award;
531: my $cas = &Apache::lonxml::get_param('cas',$parstack,$safeeval);
532: if ($cas eq 'maxima') {
533: my $args = [&Apache::lonxml::get_param_var('args',$parstack,$safeeval)];
534: $award=&Apache::lonmaxima::maxima_run($Apache::response::custom_answer[-1],$response,$args);
535: }
536: if (!&Apache::inputtags::valid_award($award)) {
537: $error = $award;
538: $award = 'ERROR';
539: }
540: &Apache::response::handle_previous(\%previous,$award);
541: $Apache::lonhomework::results{"resource.$part.$id.awarddetail"}=
542: $award;
543: if ($error) {
544: $Apache::lonhomework::results{"resource.$part.$id.awardmsg"}=
545: $error;
546: }
547: }
548: }
549: if ($target eq 'web') {
550: &setup_prior_tries_hash(\&format_prior_response_math);
551: }
552:
553: pop(@Apache::lonxml::namespace);
554: pop(@Apache::response::custom_answer);
555: pop(@Apache::response::custom_answer_type);
556: &Apache::lonxml::deregister('Apache::response',('answer'));
557: &Apache::response::end_response();
558: return $result;
559: }
560:
561: sub format_prior_response_math {
562: my ($mode,$answer) =@_;
563: return '<span class="LC_prior_math">'.
564: &HTML::Entities::encode($answer,'"<>&').'</span>';
565: }
566:
567: sub implicit_multiplication {
568: my ($expression)=@_;
569: # Escape scientific notation, so 3e8 does not become 3*e*8
570: # 3e8 -> 3&8; 3e-8 -> 3&-8; 3E+8 -> e&+8
571: $expression=~s/(\d+)e([\+\-]*\d+)/$1\&\($2\)/gsi;
572: # 3x10^8 -> 3&8; 3*10^-8 -> 3&-8
573: $expression=~s/(\d+)(?:x|\*)10(?:\^|\*\*)([\+\-]*\d+)/$1\&\($2\)/gsi;
574: # Fill in multiplication signs
575: # a b -> a*b;3 b -> 3*b;3 4 -> 3*4
576: $expression=~s/([A-Za-z0-9])\s+(?=[A-Za-z0-9])/$1\*/gs;
577: # )( -> )*(; ) ( -> )*(
578: $expression=~s/\)\s*\(/\)\*\(/gs;
579: # 3a -> 3*a; 3( -> 3*(; 3 ( -> 3*(; 3A -> 3*A
580: $expression=~s/(\d)\s*([a-zA-Z\(])/$1\*$2/gs;
581: # a ( -> a*(
582: $expression=~s/([A-Za-z0-9])\s+\(/$1\*\(/gs;
583: # )a -> )*a; )3 -> )*3; ) 3 -> )*3
584: $expression=~s/\)\s*([A-Za-z0-9])/\)\*$1/gs;
585: # 3&8 -> 3e8; 3&-4 -> 3e-4
586: $expression=~s/(\d+)\&\(([\+\-]*\d+)\)/$1e$2/gs;
587: return $expression;
588: }
589:
590: sub start_answer {
591: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
592: my $result;
593: push(@Apache::response::custom_answer,
594: &Apache::lonxml::get_all_text_unbalanced("/answer",$parser));
595: push(@Apache::response::custom_answer_type,
596: lc(&Apache::lonxml::get_param('type',$parstack,$safeeval)));
597: $Apache::response::custom_answer_type[-1] =~ s/\s+//g;
598: if ($target eq "edit" ) {
599: $result=&Apache::edit::tag_start($target,$token,'Answer algorithm');
600: $result.=&Apache::edit::editfield($token->[1],
601: $Apache::response::custom_answer[-1],
602: '',80,4);
603: } elsif ( $target eq "modified" ) {
604: $result=$token->[4].&Apache::edit::modifiedfield('/answer',$parser);
605: }
606: return $result;
607: }
608:
609: sub end_answer {
610: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
611: if ($target eq 'edit' ) {
612: return &Apache::edit::end_table();
613: }
614: }
615:
616: sub decide_package {
617: my ($tagstack)=@_;
618: my $package;
619: if ($$tagstack[-1] eq 'parameter') {
620: $package='part';
621: } else {
622: my $i=-1;
623: while (defined($$tagstack[$i])) {
624: if ($$tagstack[$i] =~ /(response|hint)$/) {
625: $package=$$tagstack[$i];
626: last;
627: }
628: $i--;
629: }
630: }
631: return $package;
632: }
633:
634: sub start_responseparam {
635: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
636: my $result='';
637: if ($target eq 'meta') {
638: $result = &meta_parameter_write($token->[2]->{'name'},
639: $token->[2]->{'type'},
640: $token->[2]->{'default'},
641: $token->[2]->{'description'});
642: } elsif ($target eq 'edit') {
643: $result.=&Apache::edit::tag_start($target,$token);
644: my $optionlist;
645: my $package=&decide_package($tagstack);
646: foreach my $key (sort(keys(%Apache::lonnet::packagetab))) {
647: if ($key =~ /^\Q$package\E&(.*)&display$/) {
648: $optionlist.='<option value="'.$1.'">'.
649: $Apache::lonnet::packagetab{$key}.'</option>';
650: }
651: }
652: if (defined($optionlist)) {
653: $result.='Use template: <select name="'.
654: &Apache::edit::html_element_name('parameter_package').'">'.
655: '<option value=""></option>'.$optionlist.'</select><br />';
656: }
657: $result.=&Apache::edit::text_arg('Name:','name',$token).
658: &Apache::edit::text_arg('Type:','type',$token).
659: &Apache::edit::text_arg('Description:','description',$token).
660: &Apache::edit::text_arg('Default:','default',$token).
661: "</td></tr>";
662: $result.=&Apache::edit::end_table;
663: } elsif ($target eq 'modified') {
664: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
665: $safeeval,'name','type',
666: 'description','default');
667: my $element=&Apache::edit::html_element_name('parameter_package');
668: if (defined($env{"form.$element"}) && $env{"form.$element"} ne '') {
669: my $name=$env{"form.$element"};
670: my $tag=&decide_package($tagstack);
671: $token->[2]->{'name'}=$name;
672: $token->[2]->{'type'}=
673: $Apache::lonnet::packagetab{"$tag&$name&type"};
674: $token->[2]->{'description'}=
675: $Apache::lonnet::packagetab{"$tag&$name&display"};
676: $token->[2]->{'default'}=
677: $Apache::lonnet::packagetab{"$tag&$name&default"};
678: $constructtag=1;
679: }
680: if ($constructtag) {
681: $result = &Apache::edit::rebuild_tag($token);
682: }
683: } elsif ($target eq 'grade' || $target eq 'answer' || $target eq 'web' ||
684: $target eq 'tex' || $target eq 'analyze' ) {
685: if ($env{'request.state'} eq 'construct') {
686: my $name =&Apache::lonxml::get_param('name',$parstack,$safeeval);
687: my $default=&Apache::lonxml::get_param('default',$parstack,
688: $safeeval);
689: if ($name) {$Apache::inputtags::params{$name}=$default;}
690: }
691: }
692: return $result;
693: }
694:
695: sub end_responseparam {
696: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
697: if ($target eq 'edit') { return ('','no'); }
698: return '';
699: }
700:
701: sub start_parameter {
702: return &start_responseparam(@_);
703: }
704:
705: sub end_parameter {
706: return &end_responseparam(@_);
707: }
708:
709: sub reset_params {
710: %Apache::inputtags::params=();
711: }
712:
713: sub setup_params {
714: my ($tag,$safeeval) = @_;
715:
716: if ($env{'request.state'} eq 'construct') { return; }
717: my %paramlist=();
718: foreach my $key (keys(%Apache::lonnet::packagetab)) {
719: if ($key =~ /^\Q$tag\E/) {
720: my ($package,$name) = split(/&/,$key);
721: $paramlist{$name}=1;
722: }
723: }
724: foreach my $key (keys(%paramlist)) {
725: my $entry= 'resource.'.$Apache::inputtags::part;
726: if (defined($Apache::inputtags::response[-1])) {
727: $entry.='_'.$Apache::inputtags::response[-1];
728: }
729: $entry.='.'.$key;
730: &Apache::lonxml::debug("looking for $entry");
731: my $value = &Apache::lonnet::EXT("$entry");
732: &Apache::lonxml::debug("$key has value :$value:");
733: if ($value eq 'con_lost' || $value =~ /^error:/) {
734: &Apache::lonxml::debug("using nothing");
735: $Apache::inputtags::params{$key}='';
736: } else {
737: my $string="{return qq\0".$value."\0}";
738: my $newvalue=&Apache::run::run($string,$safeeval,1);
739: if (defined($newvalue)) { $value=$newvalue; }
740: $Apache::inputtags::params{$key}=$value;
741: }
742: }
743: }
744:
745: {
746: my @answer_bits;
747: my $need_row_start;
748:
749: sub answer_header {
750: my ($type,$increment,$rows) = @_;
751: my $result;
752: if ($env{'form.answer_output_mode'} eq 'tex') {
753: undef(@answer_bits);
754: my $bit;
755: if ($Apache::lonhomework::type eq 'exam') {
756: $bit = ($Apache::lonxml::counter+$increment).') ';
757: } else {
758: $bit .= ' Answer for Part: \verb|'.
759: $Apache::inputtags::part.'| ';
760: }
761: push(@answer_bits,$bit);
762: } else {
763: my $td = '<td '.(defined($rows)?'rowspan="'.$rows.'"':'').'>';
764: $result = '<table border="1"><tr>';
765: if ($Apache::lonhomework::type eq 'exam') {
766: $result .= $td.($Apache::lonxml::counter+$increment). ')</td>';
767: } else {
768: $result .= $td.&mt('Answer for Part: [_1]',
769: $Apache::inputtags::part).'</td>';
770: }
771: $result .= "\n";
772: $need_row_start = 0;
773: }
774: return $result;
775: }
776:
777: sub next_answer {
778: my ($type) = @_;
779: my $result;
780: if ($env{'form.answer_output_mode'} eq 'tex') {
781: # FIXME ... need to do something with tex mode
782: } else {
783: $result .= "</tr>";
784: $need_row_start = 1;
785: }
786: return $result;
787: }
788:
789: sub answer_part {
790: my ($type,$answer,$args) = @_;
791: my $result;
792: if ($env{'form.answer_output_mode'} eq 'tex') {
793: if (!$args->{'no_verbatim'}) {
794: my $to_use='|';
795: foreach my $value (32..126) {
796: my $char=pack('c',$value);
797: if ($answer !~ /\Q$char\E/) {
798: $to_use=$char;
799: last;
800: }
801: }
802: if ($answer ne '') {
803: $answer = '\verb'.$to_use.$answer.$to_use;
804: }
805: }
806: if ($answer ne '') {
807: push(@answer_bits,$answer);
808: }
809: } else {
810: if ($need_row_start) {
811: $result .= '<tr>';
812: $need_row_start = 0;
813: }
814: $result .= '<td>'.$answer.'</td>';
815: }
816: return $result;
817: }
818:
819: sub answer_footer {
820: my ($type) = @_;
821: my $result;
822: if ($env{'form.answer_output_mode'} eq 'tex') {
823: my $columns = scalar(@answer_bits);
824: $result = ' \vskip 0 mm \noindent \begin{tabular}{|'.'c|'x$columns.'}\hline ';
825: $result .= join(' & ',@answer_bits);
826: $result .= ' \\\\ \\hline \end{tabular} \vskip 0 mm ';
827: } else {
828: $result = '</tr></table>';
829: }
830: return $result;
831: }
832:
833: }
834:
835: sub showallfoils {
836: if (defined($env{'form.showallfoils'})) {
837: my ($symb)=&Apache::lonnet::whichuser();
838: if (($env{'request.state'} eq 'construct') ||
839: ($env{'user.adv'} && $symb eq '') ||
840: ($Apache::lonhomework::viewgrades) ) {
841: return 1;
842: }
843: }
844: if ($Apache::lonhomework::type eq 'survey') { return 1; }
845: return 0;
846: }
847:
848: =pod
849:
850: =item &getresponse($offset,$resulttype);
851:
852: Retreives the current submitted response, helps out in the case of
853: scantron mode.
854:
855: Returns either the exact text of the submission, or a bubbled response
856: converted to something usable.
857:
858: Optional Arguments:
859: $offset - (defaults to 1) if a problem has more than one bubble
860: response, pass in the number of the bubble wanted, (the
861: first bubble associated with a problem has an offset of 1,
862: the second bubble is 2
863:
864: $resulttype - undef -> a number between 0 and 25
865: 'A is 1' -> a number between 1 and 26
866: 'letter' -> a letter between 'A' and 'Z'
867: $lines - undef problem only needs a single line of bubbles.
868: nonzero Problem wants the first nonempty response in
869: $lines lines of bubbles.
870: $bubbles_per_line - Must be provided if lines is defined.. number of
871: bubbles on a line.
872:
873: =cut
874:
875: sub getresponse {
876: my ($offset,$resulttype, $lines, $bubbles_per_line)=@_;
877: my $formparm='form.HWVAL_'.$Apache::inputtags::response['-1'];
878: my $response;
879: if (!defined($offset)) {
880: $offset=1;
881: } else {
882: $formparm.=":$offset";
883: }
884: if (!defined($lines)) {
885: $lines = 1;
886: }
887: my %let_to_num=('A'=>0,'B'=>1,'C'=>2,'D'=>3,'E'=>4,'F'=>5,'G'=>6,'H'=>7,
888: 'I'=>8,'J'=>9,'K'=>10,'L'=>11,'M'=>12,'N'=>13,'O'=>14,
889: 'P'=>15,'Q'=>16,'R'=>17,'S'=>18,'T'=>19,'U'=>20,'V'=>21,
890: 'W'=>22,'X'=>23,'Y'=>24,'Z'=>25);
891: if ($env{'form.submitted'} eq 'scantron') {
892: my $part = $Apache::inputtags::part;
893: my $id = $Apache::inputtags::response[-1];
894:
895: my $line;
896: for ($line = 0; $line < $lines; $line++) {
897: my $theline = $Apache::lonxml::counter+$offset-1+$line;
898: $response = $env{"scantron.$theline.answer"};
899: if ((defined($response)) && ($response ne "") && ($response ne " ")) {
900: last;
901: }
902:
903: }
904:
905: # save bubbled letter for later
906: $Apache::lonhomework::results{"resource.$part.$id.scantron"}.=
907: $response;
908: if ($resulttype ne 'letter') {
909: if ($resulttype eq 'A is 1') {
910: $response = $let_to_num{$response}+1;
911: } else {
912: $response = $let_to_num{$response};
913: }
914: if ($response ne "") {
915: $response += $line * $bubbles_per_line;
916: }
917: } else {
918: if ($response ne "") {
919: $response = chr(ord($response) + $line * $bubbles_per_line);
920: }
921: }
922:
923: } else {
924: $response = $env{$formparm};
925: }
926: #
927: # If we have a nonempty answer, correct the numeric value
928: # of the answer for the line on which it was found.
929: #
930:
931: return $response;
932: }
933:
934: =pod
935:
936: =item &repetition();
937:
938: Returns the number of lines that are required to encode the weight.
939: (Currently expects that there are 10 bubbles per line)
940:
941: =cut
942:
943: sub repetition {
944: my $id = $Apache::inputtags::part;
945: my $weight = &Apache::lonnet::EXT("resource.$id.weight");
946: if (!defined($weight) || ($weight eq '')) { $weight=1; }
947: my $repetition = int($weight/10);
948: if ($weight % 10 != 0) { $repetition++; }
949: return $repetition;
950: }
951:
952: =pod
953:
954: =item &scored_response($part_id,$response_id);
955:
956: Sets the results hash elements
957:
958: resource.$part_id.$response_id.awarded - to the floating point
959: number between 0 and 1 that was awarded on the bubbled input
960:
961: resource.$part_id.$response_id.awarddetail - to 'ASSIGNED_SCORE'
962:
963: Returns
964:
965: the number of bubble sheet lines that were used (and likely need to
966: be passed to &Apache::lonxml::increment_counter()
967:
968: Arguments
969:
970: $part_id - id of the part to grade
971: $response_id - id of the response to grade
972:
973:
974: =cut
975:
976: sub scored_response {
977: my ($part,$id)=@_;
978: my $repetition=&repetition();
979: my $score=0;
980: for (my $i=0;$i<$repetition;$i++) {
981: # A is 1, B is 2, etc. (get response return 0-9 and then we add 1)
982: my $increase=&Apache::response::getresponse($i+1);
983: if ($increase ne '') { $score+=$increase+1; }
984: }
985: my $weight = &Apache::lonnet::EXT("resource.$part.weight");
986: if (!defined($weight) || $weight eq '' || $weight eq 0) { $weight = 1; }
987: my $pcr=$score/$weight;
988: $Apache::lonhomework::results{"resource.$part.$id.awarded"}=$pcr;
989: $Apache::lonhomework::results{"resource.$part.$id.awarddetail"}=
990: 'ASSIGNED_SCORE';
991: return $repetition;
992: }
993:
994: sub whichorder {
995: my ($max,$randomize,$showall,$hash)=@_;
996: #&Apache::lonxml::debug("man $max randomize $randomize");
997: if (!defined(@{ $$hash{'names'} })) { return; }
998: my @names = @{ $$hash{'names'} };
999: my @whichopt =();
1000: my (%top,@toplist,%bottom,@bottomlist);
1001: if (!($showall || ($randomize eq 'no'))) {
1002: my $current=0;
1003: foreach my $name (@names) {
1004: $current++;
1005: if ($$hash{"$name.location"} eq 'top') {
1006: $top{$name}=$current;
1007: } elsif ($$hash{"$name.location"} eq 'bottom') {
1008: $bottom{$name}=$current;
1009: }
1010: }
1011: }
1012: my $topcount=0;
1013: my $bottomcount=0;
1014: while (((scalar(@whichopt)+$topcount+$bottomcount) < $max || $showall)
1015: && ($#names > -1)) {
1016: #&Apache::lonxml::debug("Have $#whichopt max is $max");
1017: my $aopt;
1018: if ($showall || ($randomize eq 'no')) {
1019: $aopt=0;
1020: } else {
1021: $aopt=int(&Math::Random::random_uniform() * ($#names+1));
1022: }
1023: #&Apache::lonxml::debug("From $#whichopt $max $#names elms, picking $aopt");
1024: $aopt=splice(@names,$aopt,1);
1025: #&Apache::lonxml::debug("Picked $aopt");
1026: if ($top{$aopt}) {
1027: $toplist[$top{$aopt}]=$aopt;
1028: $topcount++;
1029: } elsif ($bottom{$aopt}) {
1030: $bottomlist[$bottom{$aopt}]=$aopt;
1031: $bottomcount++;
1032: } else {
1033: push (@whichopt,$aopt);
1034: }
1035: }
1036: for (my $i=0;$i<=$#toplist;$i++) {
1037: if ($toplist[$i]) { unshift(@whichopt,$toplist[$i]) }
1038: }
1039: for (my $i=0;$i<=$#bottomlist;$i++) {
1040: if ($bottomlist[$i]) { push(@whichopt,$bottomlist[$i]) }
1041: }
1042: return @whichopt;
1043: }
1044:
1045: sub show_answer {
1046: my $part = $Apache::inputtags::part;
1047: my $award = $Apache::lonhomework::history{"resource.$part.solved"};
1048: my $status = $Apache::inputtags::status[-1];
1049: return ( ($award =~ /^correct/
1050: && &Apache::lonhomework::show_problem_status())
1051: || $status eq "SHOW_ANSWER");
1052: }
1053:
1054: sub analyze_store_foilgroup {
1055: my ($shown,$attrs)=@_;
1056: my $part_id="$Apache::inputtags::part.$Apache::inputtags::response[-1]";
1057: foreach my $name (@{ $Apache::response::foilgroup{'names'} }) {
1058: if (defined($Apache::lonhomework::analyze{"$part_id.foil.value.$name"})) { next; }
1059: push (@{ $Apache::lonhomework::analyze{"$part_id.foils"} },$name);
1060: foreach my $attr (@$attrs) {
1061: $Apache::lonhomework::analyze{"$part_id.foil.".$attr.".$name"} =
1062: $Apache::response::foilgroup{"$name.".$attr};
1063: }
1064: }
1065: push (@{ $Apache::lonhomework::analyze{"$part_id.shown"} }, @{ $shown });
1066: }
1067:
1068: sub check_if_computed {
1069: my ($token,$parstack,$safeeval,$name)=@_;
1070: my $value = &Apache::lonxml::get_param($name,$parstack,$safeeval);
1071: if (ref($token->[2]) eq 'HASH' && $value ne $token->[2]{$name}) {
1072: my $part_id="$Apache::inputtags::part.$Apache::inputtags::response[-1]";
1073: $Apache::lonhomework::analyze{"$part_id.answercomputed"} = 1;
1074: }
1075: }
1076:
1077: sub pick_foil_for_concept {
1078: my ($target,$attrs,$hinthash,$parstack,$safeeval)=@_;
1079: if (not defined(@{ $Apache::response::conceptgroup{'names'} })) { return; }
1080: my @names = @{ $Apache::response::conceptgroup{'names'} };
1081: my $pick=int(&Math::Random::random_uniform() * ($#names+1));
1082: my $name=$names[$pick];
1083: push @{ $Apache::response::foilgroup{'names'} }, $name;
1084: foreach my $attr (@$attrs) {
1085: $Apache::response::foilgroup{"$name.".$attr} =
1086: $Apache::response::conceptgroup{"$name.".$attr};
1087: }
1088: my $concept = &Apache::lonxml::get_param('concept',$parstack,$safeeval);
1089: $Apache::response::foilgroup{"$name.concept"} = $concept;
1090: &Apache::lonxml::debug("Selecting $name in $concept");
1091: my $part_id="$Apache::inputtags::part.$Apache::inputtags::response[-1]";
1092: if ($target eq 'analyze') {
1093: push (@{ $Apache::lonhomework::analyze{"$part_id.concepts"} },
1094: $concept);
1095: $Apache::lonhomework::analyze{"$part_id.concept.$concept"}=
1096: $Apache::response::conceptgroup{'names'};
1097: foreach my $name (@{ $Apache::response::conceptgroup{'names'} }) {
1098: push (@{ $Apache::lonhomework::analyze{"$part_id.foils"} },
1099: $name);
1100: foreach my $attr (@$attrs) {
1101: $Apache::lonhomework::analyze{"$part_id.foil.$attr.$name"}=
1102: $Apache::response::conceptgroup{"$name.$attr"};
1103: }
1104: }
1105: }
1106: push(@{ $hinthash->{"$part_id.concepts"} },$concept);
1107: $hinthash->{"$part_id.concept.$concept"}=
1108: $Apache::response::conceptgroup{'names'};
1109:
1110: }
1111: #------------------------------------------------------------
1112: #
1113: # Get a parameter associated with a problem.
1114: # Parameters:
1115: # $id - the id of the paramater, either a part id,
1116: # or a partid and responspe id joined by _
1117: # $name - Name of the parameter to fetch
1118: # $default - Default value for the paramter.
1119: #
1120: #
1121: #
1122: sub get_response_param {
1123: my ($id,$name,$default)=@_;
1124: my $parameter;
1125: if ($env{'request.state'} eq 'construct' &&
1126: defined($Apache::inputtags::params{$name})) {
1127: $parameter=$Apache::inputtags::params{$name};
1128: } else {
1129: $parameter=&Apache::lonnet::EXT("resource.$id.$name");
1130: }
1131: if (!defined($parameter) || $parameter eq '') {
1132: $parameter = $default;
1133: }
1134: return $parameter;
1135: }
1136:
1137: sub submitted {
1138: my ($who)=@_;
1139:
1140: # when scatron grading any submission is a submission
1141: if ($env{'form.submitted'} eq 'scantron') { return 1; }
1142: # if the caller only cared if this was a scantron submission
1143: if ($who eq 'scantron') { return 0; }
1144: # if the Submit Answer button for this particular part was pressed
1145: my $partid=$Apache::inputtags::part;
1146: if ($env{'form.submitted'} eq "part_$partid") {
1147: return 1;
1148: }
1149: if ($env{'form.submitted'} eq "yes"
1150: && defined($env{'form.submit_'.$partid})) {
1151: return 1;
1152: }
1153: # Submit All button on a .page was pressed
1154: if (defined($env{'form.all_submit'})) { return 1; }
1155: # otherwise no submission occured
1156: return 0;
1157: }
1158:
1159: sub add_to_gradingqueue {
1160: my ($symb,$courseid,$domain,$name) = &Apache::lonnet::whichuser();
1161: if ( $courseid eq ''
1162: || $symb eq ''
1163: || $env{'request.state'} eq 'construct'
1164: || $Apache::lonhomework::type ne 'problem') {
1165: return;
1166: }
1167:
1168: my %queue_info = ( 'type' => 'problem',
1169: 'time' => time);
1170:
1171: if (exists($Apache::lonhomework::history{"resource.0.checkedin.slot"})) {
1172: $queue_info{'slot'}=
1173: $Apache::lonhomework::history{"resource.0.checkedin.slot"};
1174: }
1175:
1176: my $result=&Apache::bridgetask::add_to_queue('gradingqueue',\%queue_info);
1177: if ($result ne 'ok') {
1178: &Apache::lonxml::error("add_to_queue said $result");
1179: }
1180: }
1181:
1182: # basically undef and 0 (both false) mean that they still have work to do
1183: # and all true values mean that they can't do any more work
1184: #
1185: # a return of undef means it is unattempted
1186: # a return of 0 means it is attmpted and wrong but still has tries
1187: # a return of 1 means it is marked correct
1188: # a return of 2 means they have exceed maximum number of tries
1189: # a return of 3 means it after the answer date
1190: sub check_status {
1191: my ($id)=@_;
1192: if (!defined($id)) { $id=$Apache::inputtags::part; }
1193: my $curtime=&Apache::lonnet::EXT('system.time');
1194: my $opendate=&Apache::lonnet::EXT("resource.$id.opendate");
1195: my $duedate=&Apache::lonnet::EXT("resource.$id.duedate");
1196: my $answerdate=&Apache::lonnet::EXT("resource.$id.answerdate");
1197: if ( $opendate && $curtime > $opendate &&
1198: $duedate && $curtime > $duedate &&
1199: $answerdate && $curtime > $answerdate) {
1200: return 3;
1201: }
1202: my $status=&Apache::lonnet::EXT("user.resource.resource.$id.solved");
1203: if ($status =~ /^correct/) { return 1; }
1204: if (!$status) { return undef; }
1205: my $maxtries=&Apache::lonnet::EXT("resource.$id.maxtries");
1206: if ($maxtries eq '') { $maxtries=2; }
1207: my $curtries=&Apache::lonnet::EXT("user.resource.resource.$id.tries");
1208: if ($curtries < $maxtries) { return 0; }
1209: return 2;
1210: }
1211:
1212: =pod
1213:
1214: =item setup_prior_tries_hash($func,$data)
1215:
1216: Foreach each past .submission $func is called with 3 arguments
1217: - the mode to set things up for (currently always 'grade')
1218: - the stored .submission string
1219: - The expansion of $data
1220:
1221: $data is an array ref containing elements that are either
1222: - scalars that are other elements of the history hash to pass to $func
1223: - ref to data to be passed untouched to $func
1224:
1225: =cut
1226:
1227: sub setup_prior_tries_hash {
1228: my ($func,$data) = @_;
1229: my $part = $Apache::inputtags::part;
1230: my $id = $Apache::inputtags::response[-1];
1231: foreach my $i (1..$Apache::lonhomework::history{'version'}) {
1232: my $sub_key = "$i:resource.$part.$id.submission";
1233: next if (!exists($Apache::lonhomework::history{$sub_key}));
1234: my @other_data;
1235: foreach my $datum (@{ $data }) {
1236: if (ref($datum)) {
1237: push(@other_data,$datum);
1238: } else {
1239: my $info_key = "$i:resource.$part.$id.$datum";
1240: push(@other_data,$Apache::lonhomework::history{$info_key});
1241: }
1242: }
1243:
1244: my $output =
1245: &$func('grade',
1246: $Apache::lonhomework::history{$sub_key},
1247: \@other_data);
1248: if (defined($output)) {
1249: $Apache::inputtags::submission_display{$sub_key} = $output;
1250: }
1251: }
1252: }
1253:
1254: 1;
1255: __END__
1256:
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