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enabled "check answers" button after the answerdate. (see http://webhost.math.rochester.edu/webworkdocs/discuss/msgReader$1416) -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 => $submitAnswers, 106 checkAnswers => $checkAnswers, 107 ); 108 109 # are certain options enforced? 110 my %must = ( 111 showOldAnswers => 0, 112 showCorrectAnswers => 0, 113 showHints => 0, 114 showSolutions => 0, 115 recordAnswers => mustRecordAnswers($permissionLevel), 116 checkAnswers => 0, 117 ); 118 119 # does the user have permission to use certain options? 120 my %can = ( 121 showOldAnswers => 1, 122 showCorrectAnswers => canShowCorrectAnswers($permissionLevel, $set->answer_date), 123 showHints => 1, 124 showSolutions => canShowSolutions($permissionLevel, $set->answer_date), 125 # attempts=num_correct+num_incorrect+1, as this happens before updating $problem 126 recordAnswers => canRecordAnswers($permissionLevel, $set->open_date, $set->due_date, 127 $problem->max_attempts, $problem->num_correct + $problem->num_incorrect + 1), 128 checkAnswers => canCheckAnswers($permissionLevel, $set->open_date, 129 $set->due_date, $set->answer_date, $problem->max_attempts, 130 $problem->num_correct + $problem->num_incorrect + 1), 131 ); 132 133 # final values for options 134 my %will; 135 foreach (keys %must) { 136 $will{$_} = $can{$_} && ($want{$_} || $must{$_}); 137 } 138 139 ##### sticky answers ##### 140 141 if (not $submitAnswers and $will{showOldAnswers}) { 142 # do this only if new answers are NOT being submitted 143 my %oldAnswers = decodeAnswers($problem->last_answer); 144 $formFields->{$_} = $oldAnswers{$_} foreach keys %oldAnswers; 145 } 146 147 ##### translation ##### 148 149 my $pg = WeBWorK::PG->new( 150 $courseEnv, 151 $effectiveUser, 152 $r->param('key'), 153 $set, 154 $problem, 155 $psvn, 156 $formFields, 157 { # translation options 158 displayMode => $displayMode, 159 showHints => $will{showHints}, 160 showSolutions => $will{showSolutions}, 161 refreshMath2img => $will{showHints} || $will{showSolutions}, 162 processAnswers => 1, 163 }, 164 ); 165 166 ##### fix hint/solution options ##### 167 168 $can{showHints} &&= $pg->{flags}->{hintExists}; 169 $can{showSolutions} &&= $pg->{flags}->{solutionExists}; 170 171 ##### store fields ##### 172 173 $self->{want} = \%want; 174 $self->{must} = \%must; 175 $self->{can} = \%can; 176 $self->{will} = \%will; 177 178 $self->{pg} = $pg; 179 } 180 181 sub if_warnings($$) { 182 my ($self, $arg) = @_; 183 return 0 unless $self->{isOpen}; 184 return $self->{pg}->{warnings} ne ""; 185 } 186 187 sub if_errors($$) { 188 my ($self, $arg) = @_; 189 return 0 unless $self->{isOpen}; 190 return $self->{pg}->{flags}->{error_flag}; 191 } 192 193 sub head { 194 my $self = shift; 195 return "" unless $self->{isOpen}; 196 return $self->{pg}->{head_text} if $self->{pg}->{head_text}; 197 } 198 199 sub path { 200 my $self = shift; 201 my $args = $_[-1]; 202 my $setName = $self->{set}->id; 203 my $problemNumber = $self->{problem}->id; 204 205 my $ce = $self->{courseEnvironment}; 206 my $root = $ce->{webworkURLs}->{root}; 207 my $courseName = $ce->{courseName}; 208 return $self->pathMacro($args, 209 "Home" => "$root", 210 $courseName => "$root/$courseName", 211 $setName => "$root/$courseName/$setName", 212 "Problem $problemNumber" => "", 213 ); 214 } 215 216 sub siblings { 217 my $self = shift; 218 my $setName = $self->{set}->id; 219 my $problemNumber = $self->{problem}->id; 220 221 my $ce = $self->{courseEnvironment}; 222 my $root = $ce->{webworkURLs}->{root}; 223 my $courseName = $ce->{courseName}; 224 225 print CGI::strong("Problems"), CGI::br(); 226 227 my $wwdb = $self->{wwdb}; 228 my $effectiveUser = $self->{r}->param("effectiveUser"); 229 my @problems; 230 push @problems, $wwdb->getProblem($effectiveUser, $setName, $_) 231 foreach ($wwdb->getProblems($effectiveUser, $setName)); 232 foreach my $problem (sort { $a->id <=> $b->id } @problems) { 233 print CGI::a({-href=>"$root/$courseName/$setName/".$problem->id."/?" 234 . $self->url_authen_args . "&displayMode=" . $self->{displayMode}}, 235 "Problem ".$problem->id), CGI::br(); 236 } 237 } 238 239 sub nav { 240 my $self = shift; 241 my $args = $_[-1]; 242 my $setName = $self->{set}->id; 243 my $problemNumber = $self->{problem}->id; 244 245 my $ce = $self->{courseEnvironment}; 246 my $root = $ce->{webworkURLs}->{root}; 247 my $courseName = $ce->{courseName}; 248 249 my $wwdb = $self->{wwdb}; 250 my $effectiveUser = $self->{r}->param("effectiveUser"); 251 my $tail = "&displayMode=".$self->{displayMode}; 252 253 my @links = ("Problem List" => "$root/$courseName/$setName"); 254 255 my $prevProblem = $wwdb->getProblem($effectiveUser, $setName, $problemNumber-1); 256 my $nextProblem = $wwdb->getProblem($effectiveUser, $setName, $problemNumber+1); 257 unshift @links, "Previous Problem" => $prevProblem 258 ? "$root/$courseName/$setName/".$prevProblem->id 259 : ""; 260 push @links, "Next Problem" => $nextProblem 261 ? "$root/$courseName/$setName/".$nextProblem->id 262 : ""; 263 264 return $self->navMacro($args, $tail, @links); 265 } 266 267 sub title { 268 my $self = shift; 269 my $setName = $self->{set}->id; 270 my $problemNumber = $self->{problem}->id; 271 272 return "$setName : Problem $problemNumber"; 273 } 274 275 sub body { 276 my $self = shift; 277 278 return CGI::p(CGI::font({-color=>"red"}, "This problem is not available because the problem set that contains it is not yet open.")) 279 unless $self->{isOpen}; 280 281 # unpack some useful variables 282 my $r = $self->{r}; 283 my $wwdb = $self->{wwdb}; 284 my $set = $self->{set}; 285 my $problem = $self->{problem}; 286 my $permissionLevel = $self->{permissionLevel}; 287 my $submitAnswers = $self->{submitAnswers}; 288 my $checkAnswers = $self->{checkAnswers}; 289 my $previewAnswers = $self->{previewAnswers}; 290 my %want = %{ $self->{want} }; 291 my %can = %{ $self->{can} }; 292 my %must = %{ $self->{must} }; 293 my %will = %{ $self->{will} }; 294 my $pg = $self->{pg}; 295 296 ##### translation errors? ##### 297 298 if ($pg->{flags}->{error_flag}) { 299 return $self->errorOutput($pg->{errors}, $pg->{body_text}); 300 } 301 302 ##### answer processing ##### 303 304 # if answers were submitted: 305 if ($submitAnswers) { 306 # store answers in DB for sticky answers 307 my %answersToStore; 308 my %answerHash = %{ $pg->{answers} }; 309 $answersToStore{$_} = $answerHash{$_}->{original_student_ans} 310 foreach (keys %answerHash); 311 my $answerString = encodeAnswers(%answersToStore, 312 @{ $pg->{flags}->{ANSWER_ENTRY_ORDER} }); 313 $problem->last_answer($answerString); 314 $wwdb->setProblem($problem); 315 316 # store state in DB if it makes sense 317 if ($will{recordAnswers}) { 318 $problem->attempted(1); 319 $problem->status($pg->{state}->{recorded_score}); 320 $problem->num_correct($pg->{state}->{num_of_correct_ans}); 321 $problem->num_incorrect($pg->{state}->{num_of_incorrect_ans}); 322 $wwdb->setProblem($problem); 323 # write to the transaction log, just to make sure 324 writeLog($self->{courseEnvironment}, "transaction", 325 $problem->id."\t". 326 $problem->set_id."\t". 327 $problem->login_id."\t". 328 $problem->source_file."\t". 329 $problem->value."\t". 330 $problem->max_attempts."\t". 331 $problem->problem_seed."\t". 332 $problem->status."\t". 333 $problem->attempted."\t". 334 $problem->last_answer."\t". 335 $problem->num_correct."\t". 336 $problem->num_incorrect 337 ); 338 } 339 } 340 341 ##### output ##### 342 343 # attempt summary 344 if ($submitAnswers or $will{showCorrectAnswers}) { 345 # print this if user submitted answers OR requested correct answers 346 print $self->attemptResults($pg, $submitAnswers, 347 $will{showCorrectAnswers}, 348 $pg->{flags}->{showPartialCorrectAnswers}, 0); 349 } elsif ($checkAnswers) { 350 # print this if user previewed answers 351 print $self->attemptResults($pg, 1, 0, 1, 0); 352 # show attempt answers 353 # don't show correct answers 354 # show attempt results (correctness) 355 # don't show attempt previews 356 } elsif ($previewAnswers) { 357 # print this if user previewed answers 358 print $self->attemptResults($pg, 1, 0, 0, 1); 359 # show attempt answers 360 # don't show correct answers 361 # don't show attempt results (correctness) 362 # show attempt previews 363 } 364 365 # score summary 366 my $attempts = $problem->num_correct + $problem->num_incorrect; 367 my $attemptsNoun = $attempts != 1 ? "times" : "time"; 368 my $lastScore = int ($problem->status * 100) . "%"; 369 my ($attemptsLeft, $attemptsLeftNoun); 370 if ($problem->max_attempts == -1) { 371 # unlimited attempts 372 $attemptsLeft = "unlimited"; 373 $attemptsLeftNoun = "attempts"; 374 } else { 375 $attemptsLeft = $problem->max_attempts - $attempts; 376 $attemptsLeftNoun = $attemptsLeft == 1 ? "attempt" : "attempts"; 377 } 378 my $setClosedMessage; 379 if (time < $set->open_date or time > $set->due_date) { 380 $setClosedMessage = "This problem set is closed."; 381 if ($permissionLevel > 0) { 382 $setClosedMessage .= " Since you are a privileged user, additional attempts will be recorded."; 383 } else { 384 $setClosedMessage .= " Additional attempts will not be recorded."; 385 } 386 } 387 print CGI::p( 388 "You have attempted this problem $attempts $attemptsNoun.", CGI::br(), 389 $problem->attempted 390 ? "Your recorded score is $lastScore." . CGI::br() 391 : "", 392 "You have $attemptsLeft $attemptsLeftNoun remaining.", CGI::br(), 393 $setClosedMessage, 394 ); 395 396 print CGI::hr(); 397 398 # main form 399 print 400 CGI::startform("POST", $r->uri), 401 $self->hidden_authen_fields, 402 CGI::p(CGI::i($pg->{result}->{msg})), 403 CGI::p($pg->{body_text}), 404 CGI::p( 405 ($can{recordAnswers} 406 ? CGI::submit(-name=>"submitAnswers", 407 -label=>"Submit Answers") 408 : ""), 409 ($can{checkAnswers} 410 ? CGI::submit(-name=>"checkAnswers", 411 -label=>"Check Answers") 412 : ""), 413 CGI::submit(-name=>"previewAnswers", 414 -label=>"Preview Answers"), 415 ), 416 $self->viewOptions(), 417 CGI::endform(); 418 419 # feedback form 420 my $ce = $self->{courseEnvironment}; 421 my $root = $ce->{webworkURLs}->{root}; 422 my $courseName = $ce->{courseName}; 423 my $feedbackURL = "$root/$courseName/feedback/"; 424 print 425 CGI::startform("POST", $feedbackURL), 426 $self->hidden_authen_fields, 427 CGI::hidden("module", __PACKAGE__), 428 CGI::hidden("set", $set->id), 429 CGI::hidden("problem", $problem->id), 430 CGI::hidden("displayMode", $self->{displayMode}), 431 CGI::hidden("showOldAnswers", $will{showOldAnswers}), 432 CGI::hidden("showCorrectAnswers", $will{showCorrectAnswers}), 433 CGI::hidden("showHints", $will{showHints}), 434 CGI::hidden("showSolutions", $will{showSolutions}), 435 CGI::p({-align=>"right"}, 436 CGI::submit(-name=>"feedbackForm", -label=>"Send Feedback") 437 ), 438 CGI::endform(); 439 440 # warning output 441 if ($pg->{warnings} ne "") { 442 print CGI::hr(), $self->warningOutput($pg->{warnings}); 443 } 444 445 # debugging stuff 446 if (0) { 447 print 448 CGI::hr(), 449 CGI::h2("debugging information"), 450 CGI::h3("form fields"), 451 ref2string($self->{formFields}), 452 CGI::h3("user object"), 453 ref2string($self->{user}), 454 CGI::h3("set object"), 455 ref2string($set), 456 CGI::h3("problem object"), 457 ref2string($problem), 458 CGI::h3("PG object"), 459 ref2string($pg, {'WeBWorK::PG::Translator' => 1}); 460 } 461 462 return ""; 463 } 464 465 ##### output utilities ##### 466 467 sub attemptResults($$$$$) { 468 my $self = shift; 469 my $pg = shift; 470 my $showAttemptAnswers = shift; 471 my $showCorrectAnswers = shift; 472 my $showAttemptResults = $showAttemptAnswers && shift; 473 my $showAttemptPreview = shift || 0; 474 my $problemResult = $pg->{result}; # the overall result of the problem 475 my @answerNames = @{ $pg->{flags}->{ANSWER_ENTRY_ORDER} }; 476 477 my $showMessages = $showAttemptAnswers && grep { $pg->{answers}->{$_}->{ans_message} } @answerNames; 478 479 my $header = CGI::th("part"); 480 $header .= $showAttemptAnswers ? CGI::th("entered") : ""; 481 $header .= $showAttemptPreview ? CGI::th("preview") : ""; 482 $header .= $showCorrectAnswers ? CGI::th("correct") : ""; 483 $header .= $showAttemptResults ? CGI::th("result") : ""; 484 $header .= $showMessages ? CGI::th("messages") : ""; 485 my @tableRows = ( $header ); 486 my $numCorrect; 487 foreach my $name (@answerNames) { 488 my $answerResult = $pg->{answers}->{$name}; 489 my $studentAnswer = $answerResult->{student_ans}; # original_student_ans 490 my $preview = ($showAttemptPreview 491 ? $self->previewAnswer($answerResult) 492 : ""); 493 my $correctAnswer = $answerResult->{correct_ans}; 494 my $answerScore = $answerResult->{score}; 495 my $answerMessage = $showMessages ? $answerResult->{ans_message} : ""; 496 497 $numCorrect += $answerScore > 0; 498 my $resultString = $answerScore ? "correct" : "incorrect"; 499 500 # get rid of the goofy prefix on the answer names (supposedly, the format 501 # of the answer names is changeable. this only fixes it for "AnSwEr" 502 $name =~ s/^AnSwEr//; 503 504 my $row = CGI::td($name); 505 $row .= $showAttemptAnswers ? CGI::td($studentAnswer) : ""; 506 $row .= $showAttemptPreview ? CGI::td($preview) : ""; 507 $row .= $showCorrectAnswers ? CGI::td($correctAnswer) : ""; 508 $row .= $showAttemptResults ? CGI::td($resultString) : ""; 509 $row .= $answerMessage ? CGI::td($answerMessage) : ""; 510 push @tableRows, $row; 511 } 512 513 my $numCorrectNoun = $numCorrect == 1 ? "question" : "questions"; 514 my $scorePercent = int ($problemResult->{score} * 100) . "\%"; 515 my $summary = "On this attempt, you answered $numCorrect $numCorrectNoun out of " 516 . scalar @answerNames . " correct, for a score of $scorePercent."; 517 return CGI::table({-border=>1}, CGI::Tr(\@tableRows)) . CGI::p($summary); 518 } 519 520 sub viewOptions($) { 521 my $self = shift; 522 my $displayMode = $self->{displayMode}; 523 my %must = %{ $self->{must} }; 524 my %can = %{ $self->{can} }; 525 my %will = %{ $self->{will} }; 526 527 my $optionLine; 528 $can{showOldAnswers} and $optionLine .= join "", 529 "Show: ", 530 CGI::checkbox( 531 -name => "showOldAnswers", 532 -checked => $will{showOldAnswers}, 533 -label => "Saved answers", 534 ), " "; 535 $can{showCorrectAnswers} and $optionLine .= join "", 536 CGI::checkbox( 537 -name => "showCorrectAnswers", 538 -checked => $will{showCorrectAnswers}, 539 -label => "Correct answers", 540 ), " "; 541 $can{showHints} and $optionLine .= join "", 542 CGI::checkbox( 543 -name => "showHints", 544 -checked => $will{showHints}, 545 -label => "Hints", 546 ), " "; 547 $can{showSolutions} and $optionLine .= join "", 548 CGI::checkbox( 549 -name => "showSolutions", 550 -checked => $will{showSolutions}, 551 -label => "Solutions", 552 ), " "; 553 $optionLine and $optionLine .= join "", CGI::br(); 554 555 return CGI::div({-style=>"border: thin groove; padding: 1ex; margin: 2ex"}, 556 "View equations as: ", 557 CGI::radio_group( 558 -name => "displayMode", 559 -values => ['plainText', 'formattedText', 'images'], 560 -default => $displayMode, 561 -labels => { 562 plainText => "plain text", 563 formattedText => "formatted text", 564 images => "images", 565 } 566 ), CGI::br(), 567 $optionLine, 568 CGI::submit(-name=>"redisplay", -label=>"Redisplay Problem"), 569 ); 570 } 571 572 sub previewAnswer($$) { 573 my ($self, $answerResult) = @_; 574 my $ce = $self->{courseEnvironment}; 575 my $effectiveUser = $self->{effectiveUser}; 576 my $set = $self->{set}; 577 my $problem = $self->{problem}; 578 my $displayMode = $self->{displayMode}; 579 580 # note: right now, we have to do things completely differently when we are 581 # rendering math from INSIDE the translator and from OUTSIDE the translator. 582 # so we'll just deal with each case explicitly here. there's some code 583 # duplication that can be dealt with later by abstracting out tth/dvipng/etc. 584 585 my $tex = $answerResult->{preview_latex_string}; 586 587 return "" unless $tex; 588 589 if ($displayMode eq "plainText") { 590 return $tex; 591 } elsif ($displayMode eq "formattedText") { 592 my $tthCommand = $ce->{externalPrograms}->{tth} 593 . " -L -f5 -r 2> /dev/null <<END_OF_INPUT; echo > /dev/null\n" 594 . "\\(".$tex."\\)\n" 595 . "END_OF_INPUT\n"; 596 597 # call tth 598 my $result = `$tthCommand`; 599 if ($?) { 600 return "<b>[tth failed: $? $@]</b>"; 601 } 602 return $result; 603 } elsif ($displayMode eq "images") { 604 # how are we going to name this? 605 my $targetPathCommon = "/png/" 606 . $effectiveUser->id . "." 607 . $set->id . "." 608 . $problem->id . "." 609 . $answerResult->{ans_name} . ".png"; 610 611 # figure out where to put things 612 my $wd = tempdir("webwork-dvipng-XXXXXXXX", DIR => $ce->{courseDirs}->{html_temp}); 613 my $latex = $ce->{externalPrograms}->{latex}; 614 my $dvipng = $ce->{externalPrograms}->{dvipng}; 615 my $targetPath = $ce->{courseDirs}->{html_temp} . $targetPathCommon; 616 # should use surePathToTmpFile, but we have to 617 # isolate it from the problem enivronment first 618 my $targetURL = $ce->{courseURLs}->{html_temp} . $targetPathCommon; 619 620 # call dvipng to generate a preview 621 dvipng($wd, $latex, $dvipng, $tex, $targetPath); 622 if (-e $targetPath) { 623 return "<img src=\"$targetURL\" alt=\"$tex\" />"; 624 } else { 625 return "<b>[math2img failed]</b>"; 626 } 627 } 628 } 629 630 ##### permission queries ##### 631 632 # this stuff should be abstracted out into the permissions system 633 # however, the permission system only knows about things in the 634 # course environment and the username. hmmm... 635 636 # also, i should fix these so that they have a consistent calling 637 # format -- perhaps: 638 # canPERM($courseEnv, $user, $set, $problem, $permissionLevel) 639 640 sub canShowCorrectAnswers($$) { 641 my ($permissionLevel, $answerDate) = @_; 642 return $permissionLevel > 0 || time > $answerDate; 643 } 644 645 sub canShowSolutions($$) { 646 my ($permissionLevel, $answerDate) = @_; 647 return canShowCorrectAnswers($permissionLevel, $answerDate); 648 } 649 650 sub canRecordAnswers($$$$$) { 651 my ($permissionLevel, $openDate, $dueDate, $maxAttempts, $attempts) = @_; 652 my $permHigh = $permissionLevel > 0; 653 my $timeOK = time >= $openDate && time <= $dueDate; 654 my $attemptsOK = $maxAttempts == -1 || $attempts <= $maxAttempts; 655 my $recordAnswers = $permHigh || ($timeOK && $attemptsOK); 656 return $recordAnswers; 657 } 658 659 sub canCheckAnswers($$$$$) { 660 my ($permissionLevel, $openDate, $dueDate, $answerDate, $maxAttempts, $attempts) = @_; 661 return time >= $answerDate or canRecordAnswers($permissionLevel, $openDate, $dueDate, $maxAttempts, $attempts); 662 } 663 664 sub mustRecordAnswers($) { 665 my ($permissionLevel) = @_; 666 return $permissionLevel == 0; 667 } 668 669 1;
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