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1. fixed some formatting in Problem 2. hardcopy allows correct answers, hints, solutions to be shown 3. privileged users are allowed to view/download "not yet open" sets -sam
1 ################################################################################ 2 # WeBWorK mod_perl (c) 2000-2002 WeBWorK Project 3 # $Id$ 4 ################################################################################ 5 6 package WeBWorK::ContentGenerator::Problem; 7 8 =head1 NAME 9 10 WeBWorK::ContentGenerator::Problem - Allow a student to interact with a problem. 11 12 =cut 13 14 use strict; 15 use warnings; 16 use base qw(WeBWorK::ContentGenerator); 17 use CGI qw(); 18 use File::Temp qw(tempdir); 19 use WeBWorK::Form; 20 use WeBWorK::PG; 21 use WeBWorK::PG::IO; 22 use WeBWorK::Utils qw(writeLog encodeAnswers decodeAnswers ref2string); 23 24 ############################################################ 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 # 41 ############################################################ 42 43 sub pre_header_initialize { 44 my ($self, $setName, $problemNumber) = @_; 45 my $courseEnv = $self->{courseEnvironment}; 46 my $r = $self->{r}; 47 my $userName = $r->param('user'); 48 my $effectiveUserName = $r->param('effectiveUser'); 49 50 ##### database setup ##### 51 52 my $cldb = WeBWorK::DB::Classlist->new($courseEnv); 53 my $wwdb = WeBWorK::DB::WW->new($courseEnv); 54 my $authdb = WeBWorK::DB::Auth->new($courseEnv); 55 56 my $user = $cldb->getUser($userName); 57 my $effectiveUser = $cldb->getUser($effectiveUserName); 58 my $set = $wwdb->getSet($effectiveUserName, $setName); 59 my $problem = $wwdb->getProblem($effectiveUserName, $setName, $problemNumber); 60 my $psvn = $wwdb->getPSVN($effectiveUserName, $setName); 61 my $permissionLevel = $authdb->getPermissions($userName); 62 63 $self->{cldb} = $cldb; 64 $self->{wwdb} = $wwdb; 65 $self->{authdb} = $authdb; 66 67 $self->{userName} = $userName; 68 $self->{user} = $user; 69 $self->{effectiveUser} = $effectiveUser; 70 $self->{set} = $set; 71 $self->{problem} = $problem; 72 $self->{permissionLevel} = $permissionLevel; 73 74 ##### form processing ##### 75 76 # set options from form fields (see comment at top of file for names) 77 my $displayMode = $r->param("displayMode") || $courseEnv->{pg}->{options}->{displayMode}; 78 my $redisplay = $r->param("redisplay"); 79 my $submitAnswers = $r->param("submitAnswers"); 80 my $checkAnswers = $r->param("checkAnswers"); 81 my $previewAnswers = $r->param("previewAnswers"); 82 83 # coerce form fields into CGI::Vars format 84 my $formFields = { WeBWorK::Form->new_from_paramable($r)->Vars }; 85 86 $self->{displayMode} = $displayMode; 87 $self->{redisplay} = $redisplay; 88 $self->{submitAnswers} = $submitAnswers; 89 $self->{checkAnswers} = $checkAnswers; 90 $self->{previewAnswers} = $previewAnswers; 91 $self->{formFields} = $formFields; 92 93 ##### permissions ##### 94 95 # are we allowed to view this problem? 96 $self->{isOpen} = time >= $set->open_date || $permissionLevel > 0; 97 return unless $self->{isOpen}; 98 99 # what does the user want to do? 100 my %want = ( 101 showOldAnswers => $r->param("showOldAnswers") || $courseEnv->{pg}->{options}->{showOldAnswers}, 102 showCorrectAnswers => $r->param("showCorrectAnswers") || $courseEnv->{pg}->{options}->{showCorrectAnswers}, 103 showHints => $r->param("showHints") || $courseEnv->{pg}->{options}->{showHints}, 104 showSolutions => $r->param("showSolutions") || $courseEnv->{pg}->{options}->{showSolutions}, 105 #recordAnswers => $r->param("recordAnswers") || 1, 106 recordAnswers => $submitAnswers, 107 ); 108 109 # are certain options enforced? 110 my %must = ( 111 showOldAnswers => 0, 112 showCorrectAnswers => 0, 113 showHints => 0, 114 showSolutions => 0, 115 recordAnswers => mustRecordAnswers($permissionLevel), 116 ); 117 118 # does the user have permission to use certain options? 119 my %can = ( 120 showOldAnswers => 1, 121 showCorrectAnswers => canShowCorrectAnswers($permissionLevel, $set->answer_date), 122 showHints => 1, 123 showSolutions => canShowSolutions($permissionLevel, $set->answer_date), 124 recordAnswers => canRecordAnswers($permissionLevel, $set->open_date, $set->due_date, 125 $problem->max_attempts, $problem->num_correct + $problem->num_incorrect + 1), 126 # num_correct+num_incorrect+1 -- as this happens before updating $problem 127 ); 128 129 # final values for options 130 my %will; 131 foreach (keys %must) { 132 $will{$_} = $can{$_} && ($want{$_} || $must{$_}); 133 } 134 135 ##### sticky answers ##### 136 137 if (not $submitAnswers and $will{showOldAnswers}) { 138 # do this only if new answers are NOT being submitted 139 my %oldAnswers = decodeAnswers($problem->last_answer); 140 $formFields->{$_} = $oldAnswers{$_} foreach keys %oldAnswers; 141 } 142 143 ##### translation ##### 144 145 my $pg = WeBWorK::PG->new( 146 $courseEnv, 147 $effectiveUser, 148 $r->param('key'), 149 $set, 150 $problem, 151 $psvn, 152 $formFields, 153 { # translation options 154 displayMode => $displayMode, 155 showHints => $will{showHints}, 156 showSolutions => $will{showSolutions}, 157 refreshMath2img => $will{showHints} || $will{showSolutions}, 158 processAnswers => 1, 159 }, 160 ); 161 162 ##### fix hint/solution options ##### 163 164 $can{showHints} &&= $pg->{flags}->{hintExists}; 165 $can{showSolutions} &&= $pg->{flags}->{solutionExists}; 166 167 ##### store fields ##### 168 169 $self->{want} = \%want; 170 $self->{must} = \%must; 171 $self->{can} = \%can; 172 $self->{will} = \%will; 173 174 $self->{pg} = $pg; 175 } 176 177 sub if_warnings($$) { 178 my ($self, $arg) = @_; 179 return 0 unless $self->{isOpen}; 180 return $self->{pg}->{warnings} ne ""; 181 } 182 183 sub if_errors($$) { 184 my ($self, $arg) = @_; 185 return 0 unless $self->{isOpen}; 186 return $self->{pg}->{flags}->{error_flag}; 187 } 188 189 sub head { 190 my $self = shift; 191 return "" unless $self->{isOpen}; 192 return $self->{pg}->{head_text} if $self->{pg}->{head_text}; 193 } 194 195 sub path { 196 my $self = shift; 197 my $args = $_[-1]; 198 my $setName = $self->{set}->id; 199 my $problemNumber = $self->{problem}->id; 200 201 my $ce = $self->{courseEnvironment}; 202 my $root = $ce->{webworkURLs}->{root}; 203 my $courseName = $ce->{courseName}; 204 return $self->pathMacro($args, 205 "Home" => "$root", 206 $courseName => "$root/$courseName", 207 $setName => "$root/$courseName/$setName", 208 "Problem $problemNumber" => "", 209 ); 210 } 211 212 sub siblings { 213 my $self = shift; 214 my $setName = $self->{set}->id; 215 my $problemNumber = $self->{problem}->id; 216 217 my $ce = $self->{courseEnvironment}; 218 my $root = $ce->{webworkURLs}->{root}; 219 my $courseName = $ce->{courseName}; 220 221 print CGI::strong("Problems"), CGI::br(); 222 223 my $wwdb = $self->{wwdb}; 224 my $effectiveUser = $self->{r}->param("effectiveUser"); 225 my @problems; 226 push @problems, $wwdb->getProblem($effectiveUser, $setName, $_) 227 foreach ($wwdb->getProblems($effectiveUser, $setName)); 228 foreach my $problem (sort { $a->id <=> $b->id } @problems) { 229 print CGI::a({-href=>"$root/$courseName/$setName/".$problem->id."/?" 230 . $self->url_authen_args . "&displayMode=" . $self->{displayMode}}, 231 "Problem ".$problem->id), CGI::br(); 232 } 233 } 234 235 sub nav { 236 my $self = shift; 237 my $args = $_[-1]; 238 my $setName = $self->{set}->id; 239 my $problemNumber = $self->{problem}->id; 240 241 my $ce = $self->{courseEnvironment}; 242 my $root = $ce->{webworkURLs}->{root}; 243 my $courseName = $ce->{courseName}; 244 245 my $wwdb = $self->{wwdb}; 246 my $effectiveUser = $self->{r}->param("effectiveUser"); 247 my $tail = "&displayMode=".$self->{displayMode}; 248 249 my @links = ("Problem List" => "$root/$courseName/$setName"); 250 251 my $prevProblem = $wwdb->getProblem($effectiveUser, $setName, $problemNumber-1); 252 my $nextProblem = $wwdb->getProblem($effectiveUser, $setName, $problemNumber+1); 253 unshift @links, "Previous Problem" => $prevProblem 254 ? "$root/$courseName/$setName/".$prevProblem->id 255 : ""; 256 push @links, "Next Problem" => $nextProblem 257 ? "$root/$courseName/$setName/".$nextProblem->id 258 : ""; 259 260 return $self->navMacro($args, $tail, @links); 261 } 262 263 sub title { 264 my $self = shift; 265 my $setName = $self->{set}->id; 266 my $problemNumber = $self->{problem}->id; 267 268 return "$setName : Problem $problemNumber"; 269 } 270 271 sub body { 272 my $self = shift; 273 274 return CGI::p(CGI::font({-color=>"red"}, "This problem is not available because the problem set that contains it is not yet open.")) 275 unless $self->{isOpen}; 276 277 # unpack some useful variables 278 my $r = $self->{r}; 279 my $wwdb = $self->{wwdb}; 280 my $set = $self->{set}; 281 my $problem = $self->{problem}; 282 my $permissionLevel = $self->{permissionLevel}; 283 my $submitAnswers = $self->{submitAnswers}; 284 my $checkAnswers = $self->{checkAnswers}; 285 my $previewAnswers = $self->{previewAnswers}; 286 my %want = %{ $self->{want} }; 287 my %can = %{ $self->{can} }; 288 my %must = %{ $self->{must} }; 289 my %will = %{ $self->{will} }; 290 my $pg = $self->{pg}; 291 292 ##### translation errors? ##### 293 294 if ($pg->{flags}->{error_flag}) { 295 return $self->errorOutput($pg->{errors}, $pg->{body_text}); 296 } 297 298 ##### answer processing ##### 299 300 # if answers were submitted: 301 if ($submitAnswers) { 302 # store answers in DB for sticky answers 303 my %answersToStore; 304 my %answerHash = %{ $pg->{answers} }; 305 $answersToStore{$_} = $answerHash{$_}->{original_student_ans} 306 foreach (keys %answerHash); 307 my $answerString = encodeAnswers(%answersToStore, 308 @{ $pg->{flags}->{ANSWER_ENTRY_ORDER} }); 309 $problem->last_answer($answerString); 310 $wwdb->setProblem($problem); 311 312 # store state in DB if it makes sense 313 if ($will{recordAnswers}) { 314 $problem->attempted(1); 315 $problem->status($pg->{state}->{recorded_score}); 316 $problem->num_correct($pg->{state}->{num_of_correct_ans}); 317 $problem->num_incorrect($pg->{state}->{num_of_incorrect_ans}); 318 $wwdb->setProblem($problem); 319 # write to the transaction log, just to make sure 320 writeLog($self->{courseEnvironment}, "transaction", 321 $problem->id."\t". 322 $problem->set_id."\t". 323 $problem->login_id."\t". 324 $problem->source_file."\t". 325 $problem->value."\t". 326 $problem->max_attempts."\t". 327 $problem->problem_seed."\t". 328 $problem->status."\t". 329 $problem->attempted."\t". 330 $problem->last_answer."\t". 331 $problem->num_correct."\t". 332 $problem->num_incorrect 333 ); 334 } 335 } 336 337 ##### output ##### 338 339 # attempt summary 340 if ($submitAnswers or $will{showCorrectAnswers}) { 341 # print this if user submitted answers OR requested correct answers 342 print $self->attemptResults($pg, $submitAnswers, 343 $will{showCorrectAnswers}, 344 $pg->{flags}->{showPartialCorrectAnswers}, 0); 345 } elsif ($checkAnswers) { 346 # print this if user previewed answers 347 print $self->attemptResults($pg, 1, 0, 1, 0); 348 # show attempt answers 349 # don't show correct answers 350 # show attempt results (correctness) 351 # don't show attempt previews 352 } elsif ($previewAnswers) { 353 # print this if user previewed answers 354 print $self->attemptResults($pg, 1, 0, 0, 1); 355 # show attempt answers 356 # don't show correct answers 357 # don't show attempt results (correctness) 358 # show attempt previews 359 } 360 361 # score summary 362 my $attempts = $problem->num_correct + $problem->num_incorrect; 363 my $attemptsNoun = $attempts != 1 ? "times" : "time"; 364 my $lastScore = int ($problem->status * 100) . "%"; 365 my ($attemptsLeft, $attemptsLeftNoun); 366 if ($problem->max_attempts == -1) { 367 # unlimited attempts 368 $attemptsLeft = "unlimited"; 369 $attemptsLeftNoun = "attempts"; 370 } else { 371 $attemptsLeft = $problem->max_attempts - $attempts; 372 $attemptsLeftNoun = $attemptsLeft == 1 ? "attempt" : "attempts"; 373 } 374 my $setClosedMessage; 375 if (time < $set->open_date or time > $set->due_date) { 376 $setClosedMessage = "This problem set is closed."; 377 if ($permissionLevel > 0) { 378 $setClosedMessage .= " Since you are a privileged user, additional attempts will be recorded."; 379 } else { 380 $setClosedMessage .= " Additional attempts will not be recorded."; 381 } 382 } 383 print CGI::p( 384 "You have attempted this problem $attempts $attemptsNoun.", CGI::br(), 385 $problem->attempted 386 ? "Your recorded score is $lastScore." . CGI::br() 387 : "", 388 "You have $attemptsLeft $attemptsLeftNoun remaining.", CGI::br(), 389 $setClosedMessage, 390 ); 391 392 print CGI::hr(); 393 394 # main form 395 print 396 CGI::startform("POST", $r->uri), 397 $self->hidden_authen_fields, 398 CGI::p(CGI::i($pg->{result}->{msg})), 399 CGI::p($pg->{body_text}), 400 CGI::p( 401 ($can{recordAnswers} 402 ? CGI::submit(-name=>"submitAnswers", 403 -label=>"Submit Answers") 404 : ""), 405 ($can{recordAnswers} 406 ? CGI::submit(-name=>"checkAnswers", 407 -label=>"Check Answers") 408 : ""), 409 CGI::submit(-name=>"previewAnswers", 410 -label=>"Preview Answers"), 411 ), 412 $self->viewOptions(), 413 CGI::endform(); 414 415 # feedback form 416 my $ce = $self->{courseEnvironment}; 417 my $root = $ce->{webworkURLs}->{root}; 418 my $courseName = $ce->{courseName}; 419 my $feedbackURL = "$root/$courseName/feedback/"; 420 print 421 CGI::startform("POST", $feedbackURL), 422 $self->hidden_authen_fields, 423 CGI::hidden("module", __PACKAGE__), 424 CGI::hidden("set", $set->id), 425 CGI::hidden("problem", $problem->id), 426 CGI::hidden("displayMode", $self->{displayMode}), 427 CGI::hidden("showOldAnswers", $will{showOldAnswers}), 428 CGI::hidden("showCorrectAnswers", $will{showCorrectAnswers}), 429 CGI::hidden("showHints", $will{showHints}), 430 CGI::hidden("showSolutions", $will{showSolutions}), 431 CGI::p({-align=>"right"}, 432 CGI::submit(-name=>"feedbackForm", -label=>"Send Feedback") 433 ), 434 CGI::endform(); 435 436 # warning output 437 if ($pg->{warnings} ne "") { 438 print CGI::hr(), $self->warningOutput($pg->{warnings}); 439 } 440 441 # debugging stuff 442 if (1) { 443 print 444 CGI::hr(), 445 CGI::h2("debugging information"), 446 CGI::h3("form fields"), 447 ref2string($self->{formFields}), 448 CGI::h3("user object"), 449 ref2string($self->{user}), 450 CGI::h3("set object"), 451 ref2string($set), 452 CGI::h3("problem object"), 453 ref2string($problem), 454 CGI::h3("PG object"), 455 ref2string($pg, {'WeBWorK::PG::Translator' => 1}); 456 } 457 458 return ""; 459 } 460 461 ##### output utilities ##### 462 463 sub attemptResults($$$$$) { 464 my $self = shift; 465 my $pg = shift; 466 my $showAttemptAnswers = shift; 467 my $showCorrectAnswers = shift; 468 my $showAttemptResults = $showAttemptAnswers && shift; 469 my $showAttemptPreview = shift || 0; 470 my $problemResult = $pg->{result}; # the overall result of the problem 471 my @answerNames = @{ $pg->{flags}->{ANSWER_ENTRY_ORDER} }; 472 473 my $showMessages = $showAttemptAnswers && grep { $pg->{answers}->{$_}->{ans_message} } @answerNames; 474 475 my $header = CGI::th("part"); 476 $header .= $showAttemptAnswers ? CGI::th("entered") : ""; 477 $header .= $showAttemptPreview ? CGI::th("preview") : ""; 478 $header .= $showCorrectAnswers ? CGI::th("correct") : ""; 479 $header .= $showAttemptResults ? CGI::th("result") : ""; 480 $header .= $showMessages ? CGI::th("messages") : ""; 481 my @tableRows = ( $header ); 482 my $numCorrect; 483 foreach my $name (@answerNames) { 484 my $answerResult = $pg->{answers}->{$name}; 485 my $studentAnswer = $answerResult->{student_ans}; # original_student_ans 486 my $preview = ($showAttemptPreview 487 ? $self->previewAnswer($answerResult) 488 : ""); 489 my $correctAnswer = $answerResult->{correct_ans}; 490 my $answerScore = $answerResult->{score}; 491 my $answerMessage = $showMessages ? $answerResult->{ans_message} : ""; 492 493 $numCorrect += $answerScore > 0; 494 my $resultString = $answerScore ? "correct" : "incorrect"; 495 496 # get rid of the goofy prefix on the answer names (supposedly, the format 497 # of the answer names is changeable. this only fixes it for "AnSwEr" 498 $name =~ s/^AnSwEr//; 499 500 my $row = CGI::td($name); 501 $row .= $showAttemptAnswers ? CGI::td($studentAnswer) : ""; 502 $row .= $showAttemptPreview ? CGI::td($preview) : ""; 503 $row .= $showCorrectAnswers ? CGI::td($correctAnswer) : ""; 504 $row .= $showAttemptResults ? CGI::td($resultString) : ""; 505 $row .= $answerMessage ? CGI::td($answerMessage) : ""; 506 push @tableRows, $row; 507 } 508 509 my $numCorrectNoun = $numCorrect == 1 ? "question" : "questions"; 510 my $scorePercent = int ($problemResult->{score} * 100) . "\%"; 511 my $summary = "On this attempt, you answered $numCorrect $numCorrectNoun out of " 512 . scalar @answerNames . " correct, for a score of $scorePercent."; 513 return CGI::table({-border=>1}, CGI::Tr(\@tableRows)) . CGI::p($summary); 514 } 515 516 sub viewOptions($) { 517 my $self = shift; 518 my $displayMode = $self->{displayMode}; 519 my %must = %{ $self->{must} }; 520 my %can = %{ $self->{can} }; 521 my %will = %{ $self->{will} }; 522 523 my $optionLine; 524 $can{showOldAnswers} and $optionLine .= join "", 525 "Show: ", 526 CGI::checkbox( 527 -name => "showOldAnswers", 528 -checked => $will{showOldAnswers}, 529 -label => "Saved answers", 530 ), " "; 531 $can{showCorrectAnswers} and $optionLine .= join "", 532 CGI::checkbox( 533 -name => "showCorrectAnswers", 534 -checked => $will{showCorrectAnswers}, 535 -label => "Correct answers", 536 ), " "; 537 $can{showHints} and $optionLine .= join "", 538 CGI::checkbox( 539 -name => "showHints", 540 -checked => $will{showHints}, 541 -label => "Hints", 542 ), " "; 543 $can{showSolutions} and $optionLine .= join "", 544 CGI::checkbox( 545 -name => "showSolutions", 546 -checked => $will{showSolutions}, 547 -label => "Solutions", 548 ), " "; 549 $optionLine and $optionLine .= join "", CGI::br(); 550 551 return CGI::div({-style=>"border: thin groove; padding: 1ex; margin: 2ex"}, 552 "View equations as: ", 553 CGI::radio_group( 554 -name => "displayMode", 555 -values => ['plainText', 'formattedText', 'images'], 556 -default => $displayMode, 557 -labels => { 558 plainText => "plain text", 559 formattedText => "formatted text", 560 images => "images", 561 } 562 ), CGI::br(), 563 $optionLine, 564 CGI::submit(-name=>"redisplay", -label=>"Redisplay Problem"), 565 ); 566 } 567 568 sub previewAnswer($$) { 569 my ($self, $answerResult) = @_; 570 my $ce = $self->{courseEnvironment}; 571 my $effectiveUser = $self->{effectiveUser}; 572 my $set = $self->{set}; 573 my $problem = $self->{problem}; 574 my $displayMode = $self->{displayMode}; 575 576 # note: right now, we have to do things completely differently when we are 577 # rendering math from INSIDE the translator and from OUTSIDE the translator. 578 # so we'll just deal with each case explicitly here. there's some code 579 # duplication that can be dealt with later by abstracting out tth/dvipng/etc. 580 581 my $tex = $answerResult->{preview_latex_string}; 582 583 return "" unless $tex; 584 585 if ($displayMode eq "plainText") { 586 return $tex; 587 } elsif ($displayMode eq "formattedText") { 588 my $tthCommand = $ce->{externalPrograms}->{tth} 589 . " -L -f5 -r 2> /dev/null <<END_OF_INPUT; echo > /dev/null\n" 590 . "\\(".$tex."\\)\n" 591 . "END_OF_INPUT\n"; 592 593 # call tth 594 my $result = `$tthCommand`; 595 if ($?) { 596 return "<b>[tth failed: $? $@]</b>"; 597 } 598 return $result; 599 } elsif ($displayMode eq "images") { 600 # how are we going to name this? 601 my $targetPathCommon = "/png/" 602 . $effectiveUser->id . "." 603 . $set->id . "." 604 . $problem->id . "." 605 . $answerResult->{ans_name} . ".png"; 606 607 # figure out where to put things 608 my $wd = tempdir("webwork-dvipng-XXXXXXXX", DIR => $ce->{courseDirs}->{html_temp}); 609 my $latex = $ce->{externalPrograms}->{latex}; 610 my $dvipng = $ce->{externalPrograms}->{dvipng}; 611 my $targetPath = $ce->{courseDirs}->{html_temp} . $targetPathCommon; 612 # should use surePathToTmpFile, but we have to 613 # isolate it from the problem enivronment first 614 my $targetURL = $ce->{courseURLs}->{html_temp} . $targetPathCommon; 615 616 # call dvipng to generate a preview 617 dvipng($wd, $latex, $dvipng, $tex, $targetPath); 618 if (-e $targetPath) { 619 return "<img src=\"$targetURL\" alt=\"$tex\" />"; 620 } else { 621 return "<b>[math2img failed]</b>"; 622 } 623 } 624 } 625 626 ##### permission queries ##### 627 628 # this stuff should be abstracted out into the permissions system 629 # however, the permission system only knows about things in the 630 # course environment and the username. hmmm... 631 632 # also, i should fix these so that they have a consistent calling 633 # format -- perhaps: 634 # canPERM($courseEnv, $user, $set, $problem, $permissionLevel) 635 636 sub canShowCorrectAnswers($$) { 637 my ($permissionLevel, $answerDate) = @_; 638 return $permissionLevel > 0 || time > $answerDate; 639 } 640 641 sub canShowSolutions($$) { 642 my ($permissionLevel, $answerDate) = @_; 643 return canShowCorrectAnswers($permissionLevel, $answerDate); 644 } 645 646 sub canRecordAnswers($$$$$) { 647 my ($permissionLevel, $openDate, $dueDate, $maxAttempts, $attempts) = @_; 648 my $permHigh = $permissionLevel > 0; 649 my $timeOK = time >= $openDate && time <= $dueDate; 650 my $attemptsOK = $maxAttempts == -1 || $attempts <= $maxAttempts; 651 my $recordAnswers = $permHigh || ($timeOK && $attemptsOK); 652 return $recordAnswers; 653 } 654 655 sub mustRecordAnswers($) { 656 my ($permissionLevel) = @_; 657 return $permissionLevel == 0; 658 } 659 660 1;
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