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1################################################################################
2# WeBWorK mod_perl (c) 2000-2002 WeBWorK Project
3# $Id$
4################################################################################
5
1package WeBWorK::ContentGenerator::Problem; 6package WeBWorK::ContentGenerator::Problem;
2our @ISA = qw(WeBWorK::ContentGenerator); 7use base qw(WeBWorK::ContentGenerator);
8
9=head1 NAME
10
11WeBWorK::ContentGenerator::Problem - Allow a student to interact with a problem.
12
13=cut
3 14
4use strict; 15use strict;
5use warnings; 16use warnings;
6use lib '/home/malsyned/xmlrpc/daemon'; 17use CGI qw();
7use lib '/Users/gage/webwork-modperl/lib'; 18use File::Temp qw(tempdir);
8use PGtranslator5; 19use WeBWorK::Form;
9use WeBWorK::ContentGenerator; 20use WeBWorK::PG;
10use Apache::Constants qw(:common); 21use WeBWorK::PG::IO;
22use WeBWorK::Utils qw(writeLog encodeAnswers decodeAnswers ref2string);
11 23
12############################################################################### 24############################################################
13# Configuration 25#
26# user
27# effectiveUser
28# key
29#
30# displayMode
31# showOldAnswers
32# showCorrectAnswers
33# showHints
34# showSolutions
35#
36# AnSwEr# - answer blanks in problem
37#
38# redisplay - name of the "Redisplay Problem" button
39# submitAnswers - name of "Submit Answers" button
40# checkAnswers - name of the "Check Answers" button
41# previewAnswers - name of the "Preview Answers" button
42#
14############################################################################### 43############################################################
15my $USER_DIRECTORY = '/Users/gage';
16my $COURSE_SCRIPTS_DIRECTORY = "$USER_DIRECTORY/webwork/system/courseScripts/";
17my $MACRO_DIRECTORY = "$USER_DIRECTORY/webwork-modperl/courses/demoCourse/templates/macros/";
18my $TEMPLATE_DIRECTORY = "$USER_DIRECTORY/rochester_problib/";
19my $TEMP_URL = "http://127.0.0.1/~gage/rochester_problibtmp/";
20##my $HTML_DIRECTORY = "/Users/gage/Sites/rochester_problib/" #already obtained from courseEnvironment
21my $HTML_URL = "http://127.0.0.1/~gage/rochester_problib/";
22my $TEMP_DIRECTORY = ""; # has to be here... for now
23 44
24############################################################################### 45sub pre_header_initialize {
25# End configuration 46 my ($self, $setName, $problemNumber) = @_;
26############################################################################### 47 my $r = $self->{r};
48 my $courseEnv = $self->{ce};
49 my $db = $self->{db};
50 my $userName = $r->param('user');
51 my $effectiveUserName = $r->param('effectiveUser');
52
53 my $user = $db->getUser($userName);
54 my $effectiveUser = $db->getUser($effectiveUserName);
55 my $set = $db->getGlobalUserSet($effectiveUserName, $setName);
56 my $problem = $db->getGlobalUserProblem($effectiveUserName, $setName, $problemNumber);
57 my $psvn = $set->psvn();
58 my $permissionLevel = $db->getPermissionLevel($userName)->permission();
59
60 $self->{userName} = $userName;
61 $self->{user} = $user;
62 $self->{effectiveUser} = $effectiveUser;
63 $self->{set} = $set;
64 $self->{problem} = $problem;
65 $self->{permissionLevel} = $permissionLevel;
66
67 ##### form processing #####
68
69 # set options from form fields (see comment at top of file for names)
70 my $displayMode = $r->param("displayMode") || $courseEnv->{pg}->{options}->{displayMode};
71 my $redisplay = $r->param("redisplay");
72 my $submitAnswers = $r->param("submitAnswers");
73 my $checkAnswers = $r->param("checkAnswers");
74 my $previewAnswers = $r->param("previewAnswers");
75
76 # coerce form fields into CGI::Vars format
77 my $formFields = { WeBWorK::Form->new_from_paramable($r)->Vars };
78
79 $self->{displayMode} = $displayMode;
80 $self->{redisplay} = $redisplay;
81 $self->{submitAnswers} = $submitAnswers;
82 $self->{checkAnswers} = $checkAnswers;
83 $self->{previewAnswers} = $previewAnswers;
84 $self->{formFields} = $formFields;
85
86 ##### permissions #####
87
88 # are we allowed to view this problem?
89 $self->{isOpen} = time >= $set->open_date || $permissionLevel > 0;
90 return unless $self->{isOpen};
91
92 # what does the user want to do?
93 my %want = (
94 showOldAnswers => $r->param("showOldAnswers") || $courseEnv->{pg}->{options}->{showOldAnswers},
95 showCorrectAnswers => $r->param("showCorrectAnswers") || $courseEnv->{pg}->{options}->{showCorrectAnswers},
96 showHints => $r->param("showHints") || $courseEnv->{pg}->{options}->{showHints},
97 showSolutions => $r->param("showSolutions") || $courseEnv->{pg}->{options}->{showSolutions},
98 recordAnswers => $submitAnswers,
99 checkAnswers => $checkAnswers,
100 );
101
102 # are certain options enforced?
103 my %must = (
104 showOldAnswers => 0,
105 showCorrectAnswers => 0,
106 showHints => 0,
107 showSolutions => 0,
108 recordAnswers => mustRecordAnswers($permissionLevel),
109 checkAnswers => 0,
110 );
111
112 # does the user have permission to use certain options?
113 my %can = (
114 showOldAnswers => 1,
115 showCorrectAnswers => canShowCorrectAnswers($permissionLevel, $set->answer_date),
116 showHints => 1,
117 showSolutions => canShowSolutions($permissionLevel, $set->answer_date),
118 recordAnswers => canRecordAnswers($permissionLevel, $set->open_date, $set->due_date,
119 $problem->max_attempts, $problem->num_correct + $problem->num_incorrect + 1),
120 # attempts=num_correct+num_incorrect+1, as this happens before updating $problem
121 checkAnswers => canCheckAnswers($permissionLevel, $set->answer_date),
122 );
123
124 # final values for options
125 my %will;
126 foreach (keys %must) {
127 $will{$_} = $can{$_} && ($want{$_} || $must{$_});
128 }
129
130 ##### sticky answers #####
131
132 if (not $submitAnswers and $will{showOldAnswers}) {
133 # do this only if new answers are NOT being submitted
134 my %oldAnswers = decodeAnswers($problem->last_answer);
135 $formFields->{$_} = $oldAnswers{$_} foreach keys %oldAnswers;
136 }
137
138 ##### translation #####
139
140 my $pg = WeBWorK::PG->new(
141 $courseEnv,
142 $effectiveUser,
143 $r->param('key'),
144 $set,
145 $problem,
146 $psvn,
147 $formFields,
148 { # translation options
149 displayMode => $displayMode,
150 showHints => $will{showHints},
151 showSolutions => $will{showSolutions},
152 refreshMath2img => $will{showHints} || $will{showSolutions},
153 processAnswers => 1,
154 },
155 );
156
157 ##### fix hint/solution options #####
158
159 $can{showHints} &&= $pg->{flags}->{hintExists};
160 $can{showSolutions} &&= $pg->{flags}->{solutionExists};
161
162 ##### store fields #####
163
164 $self->{want} = \%want;
165 $self->{must} = \%must;
166 $self->{can} = \%can;
167 $self->{will} = \%will;
168
169 $self->{pg} = $pg;
170}
171
172sub if_warnings($$) {
173 my ($self, $arg) = @_;
174 return 0 unless $self->{isOpen};
175 return $self->{pg}->{warnings} ne "";
176}
177
178sub if_errors($$) {
179 my ($self, $arg) = @_;
180 return 0 unless $self->{isOpen};
181 return $self->{pg}->{flags}->{error_flag};
182}
183
184sub head {
185 my $self = shift;
186 return "" unless $self->{isOpen};
187 return $self->{pg}->{head_text} if $self->{pg}->{head_text};
188}
189
190sub path {
191 my $self = shift;
192 my $args = $_[-1];
193 my $setName = $self->{set}->set_id;
194 my $problemNumber = $self->{problem}->problem_id;
195
196 my $ce = $self->{ce};
197 my $root = $ce->{webworkURLs}->{root};
198 my $courseName = $ce->{courseName};
199 return $self->pathMacro($args,
200 "Home" => "$root",
201 $courseName => "$root/$courseName",
202 $setName => "$root/$courseName/$setName",
203 "Problem $problemNumber" => "",
204 );
205}
206
207sub siblings {
208 my $self = shift;
209 my $setName = $self->{set}->set_id;
210 my $problemNumber = $self->{problem}->problem_id;
211
212 my $ce = $self->{ce};
213 my $db = $self->{db};
214 my $root = $ce->{webworkURLs}->{root};
215 my $courseName = $ce->{courseName};
216
217 print CGI::strong("Problems"), CGI::br();
218
219 my $effectiveUser = $self->{r}->param("effectiveUser");
220 my @problems;
221 push @problems, $db->getGlobalUserProblem($effectiveUser, $setName, $_)
222 foreach ($db->listUserProblems($effectiveUser, $setName));
223 foreach my $problem (sort { $a->problem_id <=> $b->problem_id } @problems) {
224 print CGI::a({-href=>"$root/$courseName/$setName/".$problem->problem_id."/?"
225 . $self->url_authen_args . "&displayMode=" . $self->{displayMode}},
226 "Problem ".$problem->problem_id), CGI::br();
227 }
228}
229
230sub nav {
231 my $self = shift;
232 my $args = $_[-1];
233 my $setName = $self->{set}->set_id;
234 my $problemNumber = $self->{problem}->problem_id;
235
236 my $ce = $self->{ce};
237 my $db = $self->{db};
238 my $root = $ce->{webworkURLs}->{root};
239 my $courseName = $ce->{courseName};
240
241 my $wwdb = $self->{wwdb};
242 my $effectiveUser = $self->{r}->param("effectiveUser");
243 my $tail = "&displayMode=".$self->{displayMode};
244
245 my @links = ("Problem List" , "$root/$courseName/$setName", "navProbList");
246
247 my $prevProblem = $db->getGlobalUserProblem($effectiveUser, $setName, $problemNumber-1);
248 my $nextProblem = $db->getGlobalUserProblem($effectiveUser, $setName, $problemNumber+1);
249 unshift @links, "Previous Problem" , ($prevProblem
250 ? "$root/$courseName/$setName/".$prevProblem->problem_id
251 : "") , "navPrev";
252 push @links, "Next Problem" , ($nextProblem
253 ? "$root/$courseName/$setName/".$nextProblem->problem_id
254 : "") , "navNext";
255
256 return $self->navMacro($args, $tail, @links);
257}
27 258
28sub title { 259sub title {
29 my ($self, $problem_set, $problem) = @_; 260 my $self = shift;
30 my $r = $self->{r}; 261 my $setName = $self->{set}->set_id;
31 my $user = $r->param('user'); 262 my $problemNumber = $self->{problem}->problem_id;
32 return "Problem $problem of problem set $problem_set for $user"; 263
264 return "$setName : Problem $problemNumber";
33} 265}
34 266
35############################################################################### 267sub body {
36# 268 my $self = shift;
37# INITIALIZATION 269
38# 270 return CGI::p(CGI::font({-color=>"red"}, "This problem is not available because the problem set that contains it is not yet open."))
39# The following code initializes an instantiation of PGtranslator5 in the 271 unless $self->{isOpen};
40# parent process. This initialized object is then share with each of the 272
41# children forked from this parent process by the daemon. 273 # unpack some useful variables
42# 274 my $r = $self->{r};
43# As far as I can tell, the child processes don't share any variable values even 275 my $db = $self->{db};
44# though their namespaces are the same. 276 my $set = $self->{set};
45############################################################################### 277 my $problem = $self->{problem};
46# First some dummy values to use for testing. 278 my $permissionLevel = $self->{permissionLevel};
47# These should be available from the problemEnvironment(it might be ok to assume that PG and dangerousMacros 279 my $submitAnswers = $self->{submitAnswers};
48# live in the courseScripts (system level macros) directory. 280 my $checkAnswers = $self->{checkAnswers};
49 281 my $previewAnswers = $self->{previewAnswers};
50#print STDERR "Begin intitalization\n"; 282 my %want = %{ $self->{want} };
51my $dummy_envir = { courseScriptsDirectory => $COURSE_SCRIPTS_DIRECTORY, 283 my %can = %{ $self->{can} };
52 displayMode => 'HTML_tth', 284 my %must = %{ $self->{must} };
53 macroDirectory => $MACRO_DIRECTORY, 285 my %will = %{ $self->{will} };
54 cgiURL => 'foo_cgiURL'}; 286 my $pg = $self->{pg};
55 287
56 288 ##### translation errors? #####
57my $PG_PL = "${COURSE_SCRIPTS_DIRECTORY}PG.pl"; 289
58my $DANGEROUS_MACROS_PL = "${COURSE_SCRIPTS_DIRECTORY}dangerousMacros.pl"; 290 if ($pg->{flags}->{error_flag}) {
59my @MODULE_LIST = ( "Exporter", "DynaLoader", "GD", "WWPlot", "Fun", 291 return $self->errorOutput($pg->{errors}, $pg->{body_text});
60 "Circle", "Label", "PGrandom", "Units", "Hermite", 292 }
61 "List", "Match","Multiple", "Select", "AlgParser", 293
62 "AnswerHash", "Fraction", "VectorField", "Complex1", 294 ##### answer processing #####
63 "Complex", "MatrixReal1", "Matrix","Distributions", 295
64 "Regression" 296 # if answers were submitted:
65); 297 if ($submitAnswers) {
66my @EXTRA_PACKAGES = ( "AlgParserWithImplicitExpand", "Expr", 298 # get a "pure" (unmerged) UserProblem to modify
67 "ExprWithImplicitExpand", "AnswerEvaluator", 299 my $pureProblem = $db->getUserProblem($problem->user_id, $problem->set_id, $problem->problem_id);
68 300 # store answers in DB for sticky answers
69); 301 my %answersToStore;
70my $INITIAL_MACRO_PACKAGES = <<END_OF_TEXT; 302 my %answerHash = %{ $pg->{answers} };
71 DOCUMENT(); 303 $answersToStore{$_} = $answerHash{$_}->{original_student_ans}
72 loadMacros( 304 foreach (keys %answerHash);
73 "PGbasicmacros.pl", 305 my $answerString = encodeAnswers(%answersToStore,
74 "PGchoicemacros.pl", 306 @{ $pg->{flags}->{ANSWER_ENTRY_ORDER} });
75 "PGanswermacros.pl", 307 $pureProblem->last_answer($answerString);
76 "PGnumericalmacros.pl", 308 $problem->last_answer($answerString);
77 "PGgraphmacros.pl", 309 $db->putUserProblem($pureProblem);
78 "PGauxiliaryFunctions.pl",
79 "PGmatrixmacros.pl",
80 "PGcomplexmacros.pl",
81 "PGstatisticsmacros.pl"
82 310
311 # store state in DB if it makes sense
312 if ($will{recordAnswers}) {
313 $problem->status($pg->{state}->{recorded_score});
314 $problem->attempted(1);
315 $problem->num_correct($pg->{state}->{num_of_correct_ans});
316 $problem->num_incorrect($pg->{state}->{num_of_incorrect_ans});
317 $pureProblem->status($pg->{state}->{recorded_score});
318 $pureProblem->attempted(1);
319 $pureProblem->num_correct($pg->{state}->{num_of_correct_ans});
320 $pureProblem->num_incorrect($pg->{state}->{num_of_incorrect_ans});
321 $db->putUserProblem($pureProblem);
322 # write to the transaction log, just to make sure
323 writeLog($self->{ce}, "transaction",
324 $problem->problem_id."\t".
325 $problem->set_id."\t".
326 $problem->user_id."\t".
327 $problem->source_file."\t".
328 $problem->value."\t".
329 $problem->max_attempts."\t".
330 $problem->problem_seed."\t".
331 $pureProblem->status."\t".
332 $pureProblem->attempted."\t".
333 $pureProblem->last_answer."\t".
334 $pureProblem->num_correct."\t".
335 $pureProblem->num_incorrect
336 );
337 }
338 }
339 # logging student answers
340 my $pastAnswerLog = undef;
341 if (defined( $self->{ce}->{webworkFiles}->{logs}->{'pastAnswerList'} )) {
342
343 $pastAnswerLog = $self->{ce}->{webworkFiles}->{logs}->{'pastAnswerList'};
344
345 if ($submitAnswers and defined($pastAnswerLog) ) {
346 my $answerString = "";
347 my %answerHash = %{ $pg->{answers} };
348 $answerString = $answerString . $answerHash{$_}->{original_student_ans}."\t"
349 foreach (sort keys %answerHash);
350 writeLog($self->{ce}, "pastAnswerList",
351 '|'.$problem->user_id.
352 '|'.$problem->set_id.
353 '|'.$problem->problem_id.'|'."\t".
354 time()."\t".
355 $answerString,
356
357 );
358
359 }
360
361 }
362 # end logging student answers
363
364 ##### output #####
365 print CGI::start_div({class=>"problemHeader"});
366 # attempt summary
367 if ($submitAnswers or $will{showCorrectAnswers}) {
368 # print this if user submitted answers OR requested correct answers
369 print $self->attemptResults($pg, $submitAnswers,
370 $will{showCorrectAnswers},
371 $pg->{flags}->{showPartialCorrectAnswers}, 1, 0);
372 } elsif ($checkAnswers) {
373 # print this if user previewed answers
374 print $self->attemptResults($pg, 1, 0, 1, 1, 0);
375 # show attempt answers
376 # don't show correct answers
377 # show attempt results (correctness)
378 # don't show attempt previews
379 } elsif ($previewAnswers) {
380 # print this if user previewed answers
381 print $self->attemptResults($pg, 1, 0, 0, 0, 1);
382 # show attempt answers
383 # don't show correct answers
384 # don't show attempt results (correctness)
385 # show attempt previews
386 }
387
388 print CGI::end_div();
389
390 print CGI::start_div({class=>"problem"});
391 #print CGI::hr();
392 # main form
393 print
394 CGI::startform("POST", $r->uri),
395 $self->hidden_authen_fields,
396 CGI::p($pg->{body_text}),
397 CGI::p($pg->{result}->{msg} ? CGI::b("Note: ") : "", CGI::i($pg->{result}->{msg})),
398 CGI::p(
399 ($can{recordAnswers}
400 ? CGI::submit(-name=>"submitAnswers",
401 -label=>"Submit Answers")
402 : ""),
403 ($can{checkAnswers}
404 ? CGI::submit(-name=>"checkAnswers",
405 -label=>"Check Answers")
406 : ""),
407 CGI::submit(-name=>"previewAnswers",
408 -label=>"Preview Answers"),
83 ); 409 );
410 print CGI::end_div();
411
412 print CGI::start_div({class=>"scoreSummary"});
413 # score summary
414 my $attempts = $problem->num_correct + $problem->num_incorrect;
415 my $attemptsNoun = $attempts != 1 ? "times" : "time";
416 my $lastScore = int ($problem->status * 100) . "%";
417 my ($attemptsLeft, $attemptsLeftNoun);
418 if ($problem->max_attempts == -1) {
419 # unlimited attempts
420 $attemptsLeft = "unlimited";
421 $attemptsLeftNoun = "attempts";
422 } else {
423 $attemptsLeft = $problem->max_attempts - $attempts;
424 $attemptsLeftNoun = $attemptsLeft == 1 ? "attempt" : "attempts";
425 }
426
427 my $setClosed = 0;
428 my $setClosedMessage;
429 if (time < $set->open_date or time > $set->due_date) {
430 $setClosed = 1;
431 $setClosedMessage = "This problem set is closed.";
432 if ($permissionLevel > 0) {
433 $setClosedMessage .= " Since you are a privileged user, additional attempts will be recorded.";
434 } else {
435 $setClosedMessage .= " Additional attempts will not be recorded.";
436 }
437 }
438 print CGI::p(
439 "You have attempted this problem $attempts $attemptsNoun.", CGI::br(),
440 $problem->attempted
441 ? "Your recorded score is $lastScore." . CGI::br()
442 : "",
443 $setClosed ? $setClosedMessage : "You have $attemptsLeft $attemptsLeftNoun remaining."
444 );
445 print CGI::end_div();
446 print CGI::hr(), CGI::start_div({class=>"viewOptions"});
447 print
448 $self->viewOptions(),CGI::end_div(),
449 CGI::endform();
84 450
85 TEXT("Hello world"); 451 print CGI::start_div({class=>"problemFooter"});
452 # feedback form
453 my $ce = $self->{ce};
454 my $root = $ce->{webworkURLs}->{root};
455 my $courseName = $ce->{courseName};
456 my $feedbackURL = "$root/$courseName/feedback/";
457
458 # arguments for answer inspection button
459 my $prof_url = $ce->{webworkURLs}->{oldProf};
460 my $cgi_url = $prof_url;
461 $cgi_url=~ s|/[^/]*$||; # clip profLogin.pl
462 my $authen_args = $self->url_authen_args();
463 my $showPastAnswersURL = "$cgi_url/showPastAnswers.pl";
464
465 #print feedback form
466 print
467 CGI::start_form(-method=>"POST", -action=>$feedbackURL),"\n",
468 $self->hidden_authen_fields,"\n",
469 CGI::hidden("module", __PACKAGE__),"\n",
470 CGI::hidden("set", $set->set_id),"\n",
471 CGI::hidden("problem", $problem->problem_id),"\n",
472 CGI::hidden("displayMode", $self->{displayMode}),"\n",
473 CGI::hidden("showOldAnswers", $will{showOldAnswers}),"\n",
474 CGI::hidden("showCorrectAnswers", $will{showCorrectAnswers}),"\n",
475 CGI::hidden("showHints", $will{showHints}),"\n",
476 CGI::hidden("showSolutions", $will{showSolutions}),"\n",
477 CGI::p({-align=>"right"},
478 CGI::submit(-name=>"feedbackForm", -label=>"Send Feedback")
479 ),
480 CGI::endform(),"\n";
481 # print answer inspection button
482 if ($self->{permissionLevel} >0) {
483
484
485 print "\n",
486 CGI::start_form(-method=>"POST",-action=>$showPastAnswersURL,-target=>"information"),"\n",
487 $self->hidden_authen_fields,"\n",
488 CGI::hidden(-name => 'course', -value=>$courseName), "\n",
489 CGI::hidden(-name => 'probNum', -value=>$problem->problem_id), "\n",
490 CGI::hidden(-name => 'setNum', -value=>$problem->set_id), "\n",
491 CGI::hidden(-name => 'User', -value=>$problem->user_id), "\n",
492 CGI::submit(-name => 'action', -value=>'Show Past Answers'), "\n",
493 CGI::endform();
494
495
496
497 }
498 # FIXME print editor link
499 if ($self->{permissionLevel}>=10 ) {
500 print CGI::a({-href=>"/webwork/$courseName/instructor/pgProblemEditor/".$set->set_id.
501 '/'.$problem->problem_id.'?'.$self->url_authen_args},'Edit this problem');
502 }
503 print CGI::end_div();
504
505 # end answer inspection button
506 # warning output
507 if ($pg->{warnings} ne "") {
508 print CGI::hr(), $self->warningOutput($pg->{warnings});
509 }
510
511 # debugging stuff
512 if (0) {
513 print
514 CGI::hr(),
515 CGI::h2("debugging information"),
516 CGI::h3("form fields"),
517 ref2string($self->{formFields}),
518 CGI::h3("user object"),
519 ref2string($self->{user}),
520 CGI::h3("set object"),
521 ref2string($set),
522 CGI::h3("problem object"),
523 ref2string($problem),
524 CGI::h3("PG object"),
525 ref2string($pg, {'WeBWorK::PG::Translator' => 1});
526 }
527
528 return "";
529}
530
531##### output utilities #####
532
533sub attemptResults($$$$$$) {
534 my $self = shift;
535 my $pg = shift;
536 my $showAttemptAnswers = shift;
537 my $showCorrectAnswers = shift;
538 my $showAttemptResults = $showAttemptAnswers && shift;
539 my $showSummary = shift;
540 my $showAttemptPreview = shift || 0;
541 my $problemResult = $pg->{result}; # the overall result of the problem
542 my @answerNames = @{ $pg->{flags}->{ANSWER_ENTRY_ORDER} };
543
544 my $showMessages = $showAttemptAnswers && grep { $pg->{answers}->{$_}->{ans_message} } @answerNames;
545
546 my $header = CGI::th("Part");
547 $header .= $showAttemptAnswers ? CGI::th("Entered") : "";
548 $header .= $showAttemptPreview ? CGI::th("Answer Preview") : "";
549 $header .= $showCorrectAnswers ? CGI::th("Correct") : "";
550 $header .= $showAttemptResults ? CGI::th("Result") : "";
551 $header .= $showMessages ? CGI::th("messages") : "";
552 my @tableRows = ( $header );
553 my $numCorrect;
554 foreach my $name (@answerNames) {
555 my $answerResult = $pg->{answers}->{$name};
556 my $studentAnswer = $answerResult->{student_ans}; # original_student_ans
557 my $preview = ($showAttemptPreview
558 ? $self->previewAnswer($answerResult)
559 : "");
560 my $correctAnswer = $answerResult->{correct_ans};
561 my $answerScore = $answerResult->{score};
562 my $answerMessage = $showMessages ? $answerResult->{ans_message} : "";
86 563
87 ENDDOCUMENT(); 564 $numCorrect += $answerScore > 0;
88 565 my $resultString = $answerScore ? "correct" : "incorrect";
89END_OF_TEXT 566
567 # get rid of the goofy prefix on the answer names (supposedly, the format
568 # of the answer names is changeable. this only fixes it for "AnSwEr"
569 $name =~ s/^AnSwEr//;
570
571 my $row = CGI::td($name);
572 $row .= $showAttemptAnswers ? CGI::td($studentAnswer) : "";
573 $row .= $showAttemptPreview ? CGI::td($preview) : "";
574 $row .= $showCorrectAnswers ? CGI::td($correctAnswer) : "";
575 $row .= $showAttemptResults ? CGI::td($resultString) : "";
576 $row .= $answerMessage ? CGI::td($answerMessage) : "";
577 push @tableRows, $row;
578 }
90 579
91#These here documents have their drawbacks. KEEP END_OF_TEXT left justified!!!!!! 580 my $numIncorrectNoun = scalar @answerNames == 1 ? "question" : "questions";
581 my $scorePercent = int ($problemResult->{score} * 100) . "\%";
582 my $summary = "On this attempt, you answered $numCorrect out of "
583 . scalar @answerNames . " $numIncorrectNoun correct, for a score of $scorePercent.";
584 return CGI::table({-class=>"attemptResults"}, CGI::Tr(\@tableRows)) . ($showSummary ? CGI::p($summary) : "");
585}
92 586
93############################################################################### 587sub viewOptions($) {
94# Now to define the body subroutine which does the hard work. 588 my $self = shift;
95############################################################################### 589 my $displayMode = $self->{displayMode};
96 590 my %must = %{ $self->{must} };
97 591 my %can = %{ $self->{can} };
98#my $SOURCE1 = $INITIAL_MACRO_PACKAGES; 592 my %will = %{ $self->{will} };
99
100sub body {
101 my ($self, $problem_set, $problem) = @_;
102 my $r = $self->{r};
103 my $courseEnvironment = $self->{courseEnvironment};
104 my $user = $r->param('user');
105 593
106 my $rh = {}; # this needs to be set to a hash containing CGI params 594 my $optionLine;
595 $can{showOldAnswers} and $optionLine .= join "",
596 "Show: &nbsp;",
597 CGI::checkbox(
598 -name => "showOldAnswers",
599 -checked => $will{showOldAnswers},
600 -label => "Saved answers",
601 ), "&nbsp;&nbsp;";
602 $can{showCorrectAnswers} and $optionLine .= join "",
603 CGI::checkbox(
604 -name => "showCorrectAnswers",
605 -checked => $will{showCorrectAnswers},
606 -label => "Correct answers",
607 ), "&nbsp;&nbsp;";
608 $can{showHints} and $optionLine .= join "",
609 CGI::checkbox(
610 -name => "showHints",
611 -checked => $will{showHints},
612 -label => "Hints",
613 ), "&nbsp;&nbsp;";
614 $can{showSolutions} and $optionLine .= join "",
615 CGI::checkbox(
616 -name => "showSolutions",
617 -checked => $will{showSolutions},
618 -label => "Solutions",
619 ), "&nbsp;&nbsp;";
620 $optionLine and $optionLine .= join "", CGI::br();
107 621
108 622 return CGI::div({-style=>"border: thin groove; padding: 1ex; margin: 2ex"},
109 my $SOURCE1 = readFile("$problem_set/$problem.pg"); 623 "View equations as: &nbsp;",
110 print STDERR "SOURCEFILE: \n$SOURCE1\n\n"; 624 CGI::radio_group(
111 625 -name => "displayMode",
112 ########################################################################### 626 -values => ['plainText', 'formattedText', 'images'],
113 # The pg problem class should have a method for installing it's problemEnvironment 627 -default => $displayMode,
114 ########################################################################### 628 -labels => {
115 629 plainText => "plain text",
116 my $problemEnvir_rh = defineProblemEnvir($self); 630 formattedText => "formatted text",
117 631 images => "images",
118
119 ##################################################################################
120 # Prime the PGtranslator object and set it loose
121 ##################################################################################
122
123
124 ###############################################################################
125 632 }
126 ############################################################################### 633 ), CGI::br(),
127 #Create the PG translator. 634 $optionLine,
128 ############################################################################### 635 CGI::submit(-name=>"redisplay", -label=>"Redisplay Problem"),
129
130 my $pt = new PGtranslator5; #pt stands for problem translator;
131
132
133 # All of these hard coded directories need to be drawn from courseEnvironment.
134 # In addition I don't think that PGtranslator uses this stack internally yet.
135 # Passing these directories through the problemEnvironment variable is what
136 # is currently being done, but I don't think it is quite right, at least for most
137 # of them.
138
139
140 $pt ->rh_directories( { courseScriptsDirectory => $COURSE_SCRIPTS_DIRECTORY,
141 macroDirectory => $MACRO_DIRECTORY,
142 ,
143 templateDirectory => $TEMPLATE_DIRECTORY,
144 tempDirectory => $TEMP_DIRECTORY,
145 }
146 ); 636 );
147
148 ###############################################################################
149 # First we load the modules from courseScripts directory.
150 # These do the "heavy lifting" in terms of formatting, creating graphs, and
151 # performing other heavy duty algorithms.
152 #
153 ###############################################################################
154
155 $pt -> evaluate_modules( @MODULE_LIST);
156 $pt -> load_extra_packages( @EXTRA_PACKAGES );
157
158 ###############################################################################
159 # Load the environment constants. Some are used by the PGtranslator object but
160 # most of them are installed inside the Safe compartment where the problem
161 # runs.
162 ###############################################################################
163 #$pt -> environment($dummy_envir);
164 $pt -> environment($problemEnvir_rh);
165
166
167 # I've forgotten what this does exactly :-)
168 $pt->initialize();
169
170 ###############################################################################
171 # PG.pl contains the basic code which defines the problem interface, input and output.
172 # dangerousMacros.pl contains subroutines which have access to the hard drive and
173 # and the directory structure. All use of external resources by the problem is supposed
174 # to go through these subroutines. The idea is to put the potentially dangerous
175 # algorithms in on place so they can be watched closely.
176 # These two files are evaluated in the Safe compartment without any restrictions.
177 # They have full use of the perl commands.
178 ###############################################################################
179 my $loadErrors = $pt -> unrestricted_load($PG_PL );
180 print STDERR "$loadErrors\n" if ($loadErrors);
181 $loadErrors = $pt -> unrestricted_load($DANGEROUS_MACROS_PL);
182 print STDERR "$loadErrors\n" if ($loadErrors);
183
184 ###############################################################################
185 # Now set the mask to restrict the operations which can be performed within
186 # a problem or a macro file.
187 ###############################################################################
188 $pt-> set_mask();
189
190 # print "\nPG.pl: $PG_PL<br>\n";
191 # print "DANGEROUS_MACROS_PL: $DANGEROUS_MACROS_PL<br>\n";
192 # print "Print dummy environment<br>\n";
193 # print pretty_print_rh($dummy_envir), "<p>\n\n";
194
195 # Read in the source code for the problem
196
197 #$INITIAL_MACRO_PACKAGES =~ tr /\r/\n/; # change everything to unix line endings.
198 $SOURCE1 =~ tr /\r/\n/;
199 #print STDERR "Source again \n $SOURCE1";
200 $pt->source_string( $SOURCE1 );
201
202 ###############################################################################
203 # Install a safety filter for screening student answers. The default is now the blank
204 # filter since the answer evaluators do a pretty good job of recompiling and screening
205 # student's answers. Still, you could prohibit back ticks, or something of the kind.
206 ###############################################################################
207
208 $pt ->rf_safety_filter( \&safetyFilter); # install blank safety filter
209
210
211 print STDERR "New PGtranslator object inititialization completed.<br>\n";
212 ################################################################################
213 ## This ends the initialization of the PGtranslator object
214 ################################################################################
215
216
217 ################################################################################
218 # Run the problem (output the html text) but also store it within the object.
219 # The correct answers are also calculated and stored within the object
220 ################################################################################
221 $pt ->translate();
222
223 #print problem output
224 print "Problem goes here<p>\n";
225 print "Problem output <br>\n";
226 print "################################################################################<br><br>";
227 print ${$pt->r_text()};
228 print "<br><br>################################################################################<br>";
229 print "<p>End of problem output<br>";
230
231
232 #print source code
233 print "Source code<pre>\n";
234 print $SOURCE1;
235 print "</pre>End source code<p>";
236 ################################################################################
237 # The format for the output is described here. We'll need a local variable
238 # to handle the warnings. From within the problem the warning command
239 # has been slaved to the __WARNINGS__ routine which is defined in Global.
240 # We'll need to provide an alternate mechanism.
241 # The base64 encoding is only needed for xml transmission.
242 ################################################################################
243 print "################################################################################<br>";
244 print "Warnings output<br>";
245 my $WARNINGS = "Let this be a warning:";
246
247 print $WARNINGS;
248
249 ################################################################################
250 # Install the standard problem grader. See gage/xmlrpc/daemon.pm or processProblem8 for detailed
251 # code on how to choose which problem grader to install, depending on courseEnvironment and problem data.
252 # See also PG.pl which provides for problem by problem overrides.
253 ################################################################################
254
255 $pt->rf_problem_grader($pt->rf_std_problem_grader);
256
257 ################################################################################
258 # creates and stores a hash of answer results inside the object: $rh_answer_results
259 ################################################################################
260 $pt -> process_answers($rh->{envir}->{inputs_ref});
261
262
263 # THE UPDATE AND GRADING LOGIC COULD USE AN OVERHAUL. IT WAS SOMEWHAT CONSTRAINED
264 # BY LEGACY CONDITIONS IN THE ORIGINAL PROCESSPROBLEM8. IT'S NOT BAD
265 # BUT IT COULD PROBABLY BE MADE A LITTLE MORE STRAIGHT FORWARD.
266 ################################################################################
267 # updates the problem state stored by the translator object from the problemEnvironment data
268 ################################################################################
269
270 # $pt->rh_problem_state({ recorded_score => $rh->{problem_state}->{recorded_score},
271 # num_of_correct_ans => $rh->{problem_state}->{num_of_correct_ans} ,
272 # num_of_incorrect_ans => $rh->{problem_state}->{num_of_incorrect_ans}
273 # } );
274 ################################################################################
275 # grade the problem (and update the problem state again.)
276 ################################################################################
277
278 # Define an entry order -- the default is the order they are received from the browser.
279 # (Which as I understand it is NOT guaranteed to be the Left->Right Up-> Down order we're
280 # used to in the West.
281
282 my %PG_FLAGS = $pt->h_flags;
283 my $ra_answer_entry_order = ( defined($PG_FLAGS{ANSWER_ENTRY_ORDER}) ) ?
284 $PG_FLAGS{ANSWER_ENTRY_ORDER} : [ keys %{$pt->rh_evaluated_answers} ] ;
285 # Decide whether any answers were submitted.
286 my $answers_submitted = 0;
287 $answers_submitted = 1 if defined( $rh->{answer_form_submitted} ) and 1 == $rh->{answer_form_submitted};
288 # If there are answers, grade them
289 my ($rh_problem_result,$rh_problem_state) = $pt->grade_problem( answers_submitted => $answers_submitted,
290 ANSWER_ENTRY_ORDER => $ra_answer_entry_order
291 ); # grades the problem.
292
293 # Output format expected by Webwork.pm (and I believe processProblem8, but check.)
294 my $out = {
295 text => ${$pt ->r_text()}, # encode_base64( ${$pt ->r_text()} ),
296 header_text => $pt->r_header, # encode_base64( ${ $pt->r_header } ),
297 answers => $pt->rh_evaluated_answers,
298 errors => $pt-> errors(),
299 WARNINGS => $WARNINGS, #encode_base64($WARNINGS ),
300 problem_result => $rh_problem_result,
301 problem_state => $rh_problem_state,
302 PG_flag => \%PG_FLAGS
303 };
304 ##########################################################################################
305 # Debugging printout of environment tables
306 ##########################################################################################
307
308 print "<P>Request item<P>\n\n";
309 print "<TABLE border=\"3\">";
310 print $self->print_form_data('<tr><td>','</td><td>','</td></tr>');
311 print "</table>\n";
312 print "path info <br>\n";
313 print $r->path_info();
314 print "<P>\n\ncourseEnvironment<P>\n\n";
315 print pretty_print_rh($courseEnvironment);
316 print "<P>\n\nproblemEnvironment<P>\n\n";
317 print pretty_print_rh($problemEnvir_rh);
318
319 ##########################################################################################
320 # End
321 ##########################################################################################
322 "";
323} 637}
324# End the"body" routine for the Problem object.
325 638
326 639sub previewAnswer($$) {
327sub safetyFilter { 640 my ($self, $answerResult) = @_;
328 my $answer = shift; # accepts one answer and checks it 641 my $ce = $self->{ce};
329 my $submittedAnswer = $answer; 642 my $effectiveUser = $self->{effectiveUser};
330 $answer = '' unless defined $answer; 643 my $set = $self->{set};
331 my ($errorno); 644 my $problem = $self->{problem};
332 $answer =~ tr/\000-\037/ /; 645 my $displayMode = $self->{displayMode};
333 #### Return if answer field is empty ########
334 unless ($answer =~ /\S/) {
335# $errorno = "<BR>No answer was submitted.";
336 $errorno = 0; ## don't report blank answer as error
337
338 return ($answer,$errorno);
339 }
340 ######### replace ^ with ** (for exponentiation)
341 # $answer =~ s/\^/**/g;
342 ######### Return if forbidden characters are found
343 unless ($answer =~ /^[a-zA-Z0-9_\-\+ \t\/@%\*\.\n^\(\)]+$/ ) {
344 $answer =~ tr/a-zA-Z0-9_\-\+ \t\/@%\*\.\n^\(\)/#/c;
345 $errorno = "<BR>There are forbidden characters in your answer: $submittedAnswer<BR>";
346
347 return ($answer,$errorno);
348 }
349
350 $errorno = 0;
351 return($answer, $errorno);
352}
353
354
355
356
357########################################################################################
358# This is the problemEnvironment structure that needs to be filled out in order to provide
359# information to PGtranslator which in turn supports the problem environment
360########################################################################################
361
362sub defineProblemEnvir {
363 my $self = shift;
364 my $r = $self->{r};
365 my $courseEnvironment = $self->{courseEnvironment};
366 my %envir=();
367# $envir{'refSubmittedAnswers'} = $refSubmittedAnswers if defined($refSubmittedAnswers);
368 $envir{'psvnNumber'} = 123456789;
369 $envir{'psvn'} = 123456789;
370 $envir{'studentName'} = 'Jane Doe';
371 $envir{'studentLogin'} = 'jd001m';
372 $envir{'studentID'} = 'xxx-xx-4321';
373 $envir{'sectionName'} = 'gage';
374 $envir{'sectionNumber'} = '111foobar';
375 $envir{'recitationName'} = 'gage_recitation';
376 $envir{'recitationNumber'} = '11_foobar recitation';
377 $envir{'setNumber'} = 'setAlgebraicGeometry';
378 $envir{'questionNumber'} = 43;
379 $envir{'probNum'} = 43;
380 $envir{'openDate'} = 3014438528;
381 $envir{'formattedOpenDate'} = '3/4/02';
382 $envir{'dueDate'} = 4014438528;
383 $envir{'formattedDueDate'} = '10/4/04';
384 $envir{'answerDate'} = 4014438528;
385 $envir{'formattedAnswerDate'} = '10/4/04';
386 $envir{'problemValue'} = 1;
387 $envir{'fileName'} = 'problem1';
388 $envir{'probFileName'} = 'problem1';
389 $envir{'languageMode'} = 'HTML_tth';
390 $envir{'displayMode'} = 'HTML_tth';
391 $envir{'outputMode'} = 'HTML_tth';
392 $envir{'courseName'} = $courseEnvironment ->{courseName};
393 $envir{'sessionKey'} = 'asdf';
394
395# initialize constants for PGanswermacros.pl
396 $envir{'numRelPercentTolDefault'} = .1;
397 $envir{'numZeroLevelDefault'} = 1E-14;
398 $envir{'numZeroLevelTolDefault'} = 1E-12;
399 $envir{'numAbsTolDefault'} = .001;
400 $envir{'numFormatDefault'} = '';
401 $envir{'functRelPercentTolDefault'} = .1;
402 $envir{'functZeroLevelDefault'} = 1E-14;
403 $envir{'functZeroLevelTolDefault'} = 1E-12;
404 $envir{'functAbsTolDefault'} = .001;
405 $envir{'functNumOfPoints'} = 3;
406 $envir{'functVarDefault'} = 'x';
407 $envir{'functLLimitDefault'} = .0000001;
408 $envir{'functULimitDefault'} = .9999999;
409 $envir{'functMaxConstantOfIntegration'} = 1E8;
410# kludge check definition of number of attempts again. The +1 is because this is used before the current answer is evaluated.
411 $envir{'numOfAttempts'} = 2; #&getProblemNumOfCorrectAns($probNum,$psvn)
412 # &getProblemNumOfIncorrectAns($probNum,$psvn)+1;
413
414#
415#
416# defining directorys and URLs
417 $envir{'templateDirectory'} = $courseEnvironment ->{courseDirs}->{templates};
418############ $envir{'classDirectory'} = $Global::classDirectory;
419# $envir{'cgiDirectory'} = $Global::cgiDirectory;
420# $envir{'cgiURL'} = getWebworkCgiURL();
421
422# $envir{'scriptDirectory'} = $Global::scriptDirectory;##omit
423 $envir{'webworkDocsURL'} = 'http://webwork.math.rochester.edu';
424 $envir{'externalTTHPath'} = '/usr/local/bin/tth';
425 646
426 647 # note: right now, we have to do things completely differently when we are
427# 648 # rendering math from INSIDE the translator and from OUTSIDE the translator.
428 $envir{'inputs_ref'} = $r->param; 649 # so we'll just deal with each case explicitly here. there's some code
429 $envir{'problemSeed'} = 3245; 650 # duplication that can be dealt with later by abstracting out tth/dvipng/etc.
430 $envir{'displaySolutionsQ'} = 1; 651
431 $envir{'displayHintsQ'} = 1; 652 my $tex = $answerResult->{preview_latex_string};
432 653
433# Directory values -- do we really need them here? 654 return "" if $tex eq "";
434 $envir{courseScriptsDirectory} = $COURSE_SCRIPTS_DIRECTORY; 655
435 $envir{macroDirectory} = $MACRO_DIRECTORY; 656 if ($displayMode eq "plainText") {
436 $envir{templateDirectory} = $TEMPLATE_DIRECTORY; 657 return $tex;
437 $envir{tempDirectory} = $TEMP_DIRECTORY; 658 } elsif ($displayMode eq "formattedText") {
438 $envir{tempURL} = $TEMP_URL; 659 my $tthCommand = $ce->{externalPrograms}->{tth}
439 $envir{htmlURL} = $HTML_URL; 660 . " -L -f5 -r 2> /dev/null <<END_OF_INPUT; echo > /dev/null\n"
440 $envir{'htmlDirectory'} = $courseEnvironment ->{courseDirectory}->{html}; 661 . "\\(".$tex."\\)\n"
441 # here is a way to pass environment variables defined in webworkCourse.ph 662 . "END_OF_INPUT\n";
442# my $k; 663
443# foreach $k (keys %Global::PG_environment ) { 664 # call tth
444# $envir{$k} = $Global::PG_environment{$k}; 665 my $result = `$tthCommand`;
445# } 666 if ($?) {
446 \%envir; 667 return "<b>[tth failed: $? $@]</b>";
447}
448
449########################################################################################
450# This recursive pretty_print function will print a hash and its sub hashes.
451########################################################################################
452sub pretty_print_rh {
453 my $r_input = shift;
454 my $out = '';
455 if ( not ref($r_input) ) {
456 $out = $r_input; # not a reference
457 } elsif (is_hash_ref($r_input)) {
458 local($^W) = 0;
459 $out .= "<TABLE border = \"2\" cellpadding = \"3\" BGCOLOR = \"#FFFFFF\">";
460 foreach my $key (sort keys %$r_input ) {
461 $out .= "<tr><TD> $key</TD><TD>=&gt;</td><td>&nbsp;".pretty_print_rh($r_input->{$key}) . "</td></tr>";
462 } 668 }
463 $out .="</table>"; 669 return $result;
464 } elsif (is_array_ref($r_input) ) { 670 } elsif ($displayMode eq "images") {
465 my @array = @$r_input; 671 # how are we going to name this?
466 $out .= "( " ; 672 my $targetPathCommon = "/png/"
467 while (@array) { 673 . $effectiveUser->id . "."
468 $out .= pretty_print_rh(shift @array) . " , "; 674 . $set->set_id . "."
675 . $problem->problem_id . "."
676 . $answerResult->{ans_name} . ".png";
677
678 # figure out where to put things
679 my $wd = tempdir("webwork-dvipng-XXXXXXXX", DIR => $ce->{courseDirs}->{html_temp});
680 my $latex = $ce->{externalPrograms}->{latex};
681 my $dvipng = $ce->{externalPrograms}->{dvipng};
682 my $targetPath = $ce->{courseDirs}->{html_temp} . $targetPathCommon;
683 # should use surePathToTmpFile, but we have to
684 # isolate it from the problem enivronment first
685 my $targetURL = $ce->{courseURLs}->{html_temp} . $targetPathCommon;
686
687 # call dvipng to generate a preview
688 dvipng($wd, $latex, $dvipng, $tex, $targetPath);
689 if (-e $targetPath) {
690 return "<img src=\"$targetURL\" alt=\"$tex\" />";
691 } else {
692 return "<b>[math2img failed]</b>";
469 } 693 }
470 $out .= " )";
471 } elsif (ref($r_input) eq 'CODE') {
472 $out = "$r_input";
473 } else {
474 $out = $r_input;
475 }
476 $out;
477}
478
479sub is_hash_ref {
480 my $in =shift;
481 my $save_SIG_die_trap = $SIG{__DIE__};
482 $SIG{__DIE__} = sub {CORE::die(@_) };
483 my $out = eval{ %{ $in } };
484 $out = ($@ eq '') ? 1 : 0;
485 $@='';
486 $SIG{__DIE__} = $save_SIG_die_trap;
487 $out;
488}
489sub is_array_ref {
490 my $in =shift;
491 my $save_SIG_die_trap = $SIG{__DIE__};
492 $SIG{__DIE__} = sub {CORE::die(@_) };
493 my $out = eval{ @{ $in } };
494 $out = ($@ eq '') ? 1 : 0;
495 $@='';
496 $SIG{__DIE__} = $save_SIG_die_trap;
497 $out;
498}
499
500######
501# Utility for slurping souce files
502#######
503
504sub readFile {
505 my $input = shift; # The set and problem: 'set0/prob1.pg'
506 my $filePath =$TEMPLATE_DIRECTORY .$input;
507 print STDERR "Reading problem from file $filePath \n";
508 print STDERR "<br>Reading problem from file $filePath <br>\n";
509 my $out;
510 print "The file is readable = ", -r $filePath, "\n";
511 if (-r $filePath) {
512 open IN, "<$filePath" or print STDERR "Hey, this file was supposed to be readable\n";
513 local($/)=undef;
514 $out = <IN>;
515 close(IN);
516 } else {
517 print "Could not read file at |$filePath|";
518 print STDERR "Could not read file at |$filePath|";
519 }
520 return($out);
521}
522
523my $foo =0;
524
525# The warning mechanism. This needs to be turned into an object of its own
526###############
527## Error message routines cribbed from CGI
528###############
529
530BEGIN { #error message routines cribbed from CGI
531
532 my $CarpLevel = 0; # How many extra package levels to skip on carp.
533 my $MaxEvalLen = 0; # How much eval '...text...' to show. 0 = all.
534
535 sub longmess {
536 my $error = shift;
537 my $mess = "";
538 my $i = 1 + $CarpLevel;
539 my ($pack,$file,$line,$sub,$eval,$require);
540
541 while (($pack,$file,$line,$sub,undef,undef,$eval,$require) = caller($i++)) {
542 if ($error =~ m/\n$/) {
543 $mess .= $error;
544 }
545 else {
546 if (defined $eval) {
547 if ($require) {
548 $sub = "require $eval";
549 }
550 else {
551 $eval =~ s/[\\\']/\\$&/g;
552 if ($MaxEvalLen && length($eval) > $MaxEvalLen) {
553 substr($eval,$MaxEvalLen) = '...';
554 }
555 $sub = "eval '$eval'";
556 }
557 }
558 elsif ($sub eq '(eval)') {
559 $sub = 'eval {...}';
560 }
561
562 $mess .= "\t$sub " if $error eq "called";
563 $mess .= "$error at $file line $line\n";
564 }
565
566 $error = "called";
567 } 694 }
568
569 $mess || $error;
570 }
571} 695}
572############### 696##### logging subroutine ####
573### Our error messages for giving maximum feedback to the user for errors within problems.
574###############
575BEGIN {
576 sub PG_floating_point_exception_handler { # 1st argument is signal name
577 my($sig) = @_;
578 print "Content-type: text/html\n\n<H4>There was a floating point arithmetic error (exception SIG$sig )</H4>--perhaps
579 you divided by zero or took the square root of a negative number?
580 <BR>\n Use the back button to return to the previous page and recheck your entries.<BR>\n";
581 exit(0);
582 }
583
584 $SIG{'FPE'} = \&PG_floating_point_exception_handler;
585#!/usr/bin/perl -w
586 sub PG_warnings_handler {
587 my @input = @_;
588 my $msg_string = longmess(@_);
589 my @msg_array = split("\n",$msg_string);
590 my $out_string = '';
591
592 # Extra stack information is provided in this next block
593 # If the warning message does NOT end in \n then a line
594 # number is appended (see Perl manual about warn function)
595 # The presence of the line number is detected below and extra
596 # stack information is added.
597 # To suppress the line number and the extra stack information
598 # add \n to the end of a warn message (in .pl files. In .pg
599 # files add ~~n instead
600
601 if ($input[$#input]=~/line \d*\.\s*$/) {
602 $out_string .= "##More details: <BR>\n----";
603 foreach my $line (@msg_array) {
604 chomp($line);
605 next unless $line =~/\w+\:\:/;
606 $out_string .= "----" .$line . "<BR>\n";
607 }
608 }
609 697
610 $Global::WARNINGS .="* " . join("<BR>",@input) . "<BR>\n" . $out_string .
611 "<BR>\n--------------------------------------<BR>\n<BR>\n";
612 $Global::background_plain_url = $Global::background_warn_url;
613 $Global::bg_color = '#FF99CC'; #for warnings -- this change may come too late
614 }
615 698
616 $SIG{__WARN__}=\&PG_warnings_handler;
617
618 $SIG{__DIE__} = sub {
619 my $message = longmess(@_);
620 $message =~ s/\n/<BR>\n/;
621 my ($package, $filename, $line) = caller();
622 # use standard die for errors eminating from XML::Parser::Expat
623 # it uses a trapped eval which sometimes fails -- apparently on purpose
624 # and the error is handled by Expat itself. We don't want
625 # to interfer with that.
626
627 if ($package eq 'XML::Parser::Expat') {
628 die @_;
629 }
630 #print "$package $filename $line \n";
631 print
632 "Content-type: text/html\r\n\r\n <h4>Software error</h4> <p>\n\n$message\n<p>\n
633 Please inform the webwork meister.<p>\n
634 In addition to the error message above the following warnings were detected:
635 <HR>
636 $Global::WARNINGS;
637 <HR>
638 It's sometimes hard to tell exactly what has gone wrong since the
639 full error message may have been sent to
640 standard error instead of to standard out.
641 <p> To debug you can
642 <ul>
643 <li> guess what went wrong and try to fix it.
644 <li> call the offending script directly from the command line
645 of unix
646 <li> enable the debugging features by redefining
647 \$cgiURL in Global.pm and checking the redirection scripts in
648 system/cgi. This will force the standard error to be placed
649 in the standard out pipe as well.
650 <li> Run tail -f error_log <br>
651 from the unix command line to see error messages from the webserver.
652 The standard error output is being placed in the error_log file for the apache
653 web server. To run this command you have to be in the directory containing the
654 error_log or enter the full path name of the error_log. <p>
655 In a standard apache installation, this file is at /usr/local/apache/logs/error_log<p>
656 In a RedHat Linux installation, this file is at /var/log/httpd/error_log<p>
657 At Rochester this file is at /ww/logs/error_log.
658 </ul>
659 Good luck.<p>\n" ;
660 };
661 699
700##### permission queries #####
662 701
702# this stuff should be abstracted out into the permissions system
703# however, the permission system only knows about things in the
704# course environment and the username. hmmm...
663 705
706# also, i should fix these so that they have a consistent calling
707# format -- perhaps:
708# canPERM($courseEnv, $user, $set, $problem, $permissionLevel)
709
710sub canShowCorrectAnswers($$) {
711 my ($permissionLevel, $answerDate) = @_;
712 return $permissionLevel > 0 || time > $answerDate;
713}
714
715sub canShowSolutions($$) {
716 my ($permissionLevel, $answerDate) = @_;
717 return canShowCorrectAnswers($permissionLevel, $answerDate);
718}
719
720sub canRecordAnswers($$$$$) {
721 my ($permissionLevel, $openDate, $dueDate, $maxAttempts, $attempts) = @_;
722 my $permHigh = $permissionLevel > 0;
723 my $timeOK = time >= $openDate && time <= $dueDate;
724 my $attemptsOK = $maxAttempts == -1 || $attempts <= $maxAttempts;
725 my $recordAnswers = $permHigh || ($timeOK && $attemptsOK);
726 return $recordAnswers;
727}
728
729sub canCheckAnswers($$) {
730 my ($permissionLevel, $answerDate) = @_;
731 my $permHigh = $permissionLevel > 0;
732 my $timeOK = time >= $answerDate;
733 my $recordAnswers = $permHigh || $timeOK;
734 return $recordAnswers;
735}
736
737sub mustRecordAnswers($) {
738 my ($permissionLevel) = @_;
739 return $permissionLevel == 0;
664} 740}
665 741
6661; 7421;
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