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changed the way canCheckAnswer() is calculated -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, $set->answer_date), 125 recordAnswers => canRecordAnswers($permissionLevel, $set->open_date, $set->due_date, 126 $problem->max_attempts, $problem->num_correct + $problem->num_incorrect + 1), 127 # attempts=num_correct+num_incorrect+1, as this happens before updating $problem 128 checkAnswers => canCheckAnswers($permissionLevel, $set->answer_date), 129 ); 130 131 # final values for options 132 my %will; 133 foreach (keys %must) { 134 $will{$_} = $can{$_} && ($want{$_} || $must{$_}); 135 } 136 137 ##### sticky answers ##### 138 139 if (not $submitAnswers and $will{showOldAnswers}) { 140 # do this only if new answers are NOT being submitted 141 my %oldAnswers = decodeAnswers($problem->last_answer); 142 $formFields->{$_} = $oldAnswers{$_} foreach keys %oldAnswers; 143 } 144 145 ##### translation ##### 146 147 my $pg = WeBWorK::PG->new( 148 $courseEnv, 149 $effectiveUser, 150 $r->param('key'), 151 $set, 152 $problem, 153 $psvn, 154 $formFields, 155 { # translation options 156 displayMode => $displayMode, 157 showHints => $will{showHints}, 158 showSolutions => $will{showSolutions}, 159 refreshMath2img => $will{showHints} || $will{showSolutions}, 160 processAnswers => 1, 161 }, 162 ); 163 164 ##### fix hint/solution options ##### 165 166 $can{showHints} &&= $pg->{flags}->{hintExists}; 167 $can{showSolutions} &&= $pg->{flags}->{solutionExists}; 168 169 ##### store fields ##### 170 171 $self->{want} = \%want; 172 $self->{must} = \%must; 173 $self->{can} = \%can; 174 $self->{will} = \%will; 175 176 $self->{pg} = $pg; 177 } 178 179 sub if_warnings($$) { 180 my ($self, $arg) = @_; 181 return 0 unless $self->{isOpen}; 182 return $self->{pg}->{warnings} ne ""; 183 } 184 185 sub if_errors($$) { 186 my ($self, $arg) = @_; 187 return 0 unless $self->{isOpen}; 188 return $self->{pg}->{flags}->{error_flag}; 189 } 190 191 sub head { 192 my $self = shift; 193 return "" unless $self->{isOpen}; 194 return $self->{pg}->{head_text} if $self->{pg}->{head_text}; 195 } 196 197 sub path { 198 my $self = shift; 199 my $args = $_[-1]; 200 my $setName = $self->{set}->id; 201 my $problemNumber = $self->{problem}->id; 202 203 my $ce = $self->{courseEnvironment}; 204 my $root = $ce->{webworkURLs}->{root}; 205 my $courseName = $ce->{courseName}; 206 return $self->pathMacro($args, 207 "Home" => "$root", 208 $courseName => "$root/$courseName", 209 $setName => "$root/$courseName/$setName", 210 "Problem $problemNumber" => "", 211 ); 212 } 213 214 sub siblings { 215 my $self = shift; 216 my $setName = $self->{set}->id; 217 my $problemNumber = $self->{problem}->id; 218 219 my $ce = $self->{courseEnvironment}; 220 my $root = $ce->{webworkURLs}->{root}; 221 my $courseName = $ce->{courseName}; 222 223 print CGI::strong("Problems"), CGI::br(); 224 225 my $wwdb = $self->{wwdb}; 226 my $effectiveUser = $self->{r}->param("effectiveUser"); 227 my @problems; 228 push @problems, $wwdb->getProblem($effectiveUser, $setName, $_) 229 foreach ($wwdb->getProblems($effectiveUser, $setName)); 230 foreach my $problem (sort { $a->id <=> $b->id } @problems) { 231 print CGI::a({-href=>"$root/$courseName/$setName/".$problem->id."/?" 232 . $self->url_authen_args . "&displayMode=" . $self->{displayMode}}, 233 "Problem ".$problem->id), CGI::br(); 234 } 235 } 236 237 sub nav { 238 my $self = shift; 239 my $args = $_[-1]; 240 my $setName = $self->{set}->id; 241 my $problemNumber = $self->{problem}->id; 242 243 my $ce = $self->{courseEnvironment}; 244 my $root = $ce->{webworkURLs}->{root}; 245 my $courseName = $ce->{courseName}; 246 247 my $wwdb = $self->{wwdb}; 248 my $effectiveUser = $self->{r}->param("effectiveUser"); 249 my $tail = "&displayMode=".$self->{displayMode}; 250 251 my @links = ("Problem List" , "$root/$courseName/$setName", "ProbList"); 252 253 my $prevProblem = $wwdb->getProblem($effectiveUser, $setName, $problemNumber-1); 254 my $nextProblem = $wwdb->getProblem($effectiveUser, $setName, $problemNumber+1); 255 unshift @links, "Previous Problem" , ($prevProblem 256 ? "$root/$courseName/$setName/".$prevProblem->id 257 : "") , "Prev"; 258 push @links, "Next Problem" , ($nextProblem 259 ? "$root/$courseName/$setName/".$nextProblem->id 260 : "") , "Next"; 261 262 return $self->navMacro($args, $tail, @links); 263 } 264 265 sub title { 266 my $self = shift; 267 my $setName = $self->{set}->id; 268 my $problemNumber = $self->{problem}->id; 269 270 return "$setName : Problem $problemNumber"; 271 } 272 273 sub body { 274 my $self = shift; 275 276 return CGI::p(CGI::font({-color=>"red"}, "This problem is not available because the problem set that contains it is not yet open.")) 277 unless $self->{isOpen}; 278 279 # unpack some useful variables 280 my $r = $self->{r}; 281 my $wwdb = $self->{wwdb}; 282 my $set = $self->{set}; 283 my $problem = $self->{problem}; 284 my $permissionLevel = $self->{permissionLevel}; 285 my $submitAnswers = $self->{submitAnswers}; 286 my $checkAnswers = $self->{checkAnswers}; 287 my $previewAnswers = $self->{previewAnswers}; 288 my %want = %{ $self->{want} }; 289 my %can = %{ $self->{can} }; 290 my %must = %{ $self->{must} }; 291 my %will = %{ $self->{will} }; 292 my $pg = $self->{pg}; 293 294 ##### translation errors? ##### 295 296 if ($pg->{flags}->{error_flag}) { 297 return $self->errorOutput($pg->{errors}, $pg->{body_text}); 298 } 299 300 ##### answer processing ##### 301 302 # if answers were submitted: 303 if ($submitAnswers) { 304 # store answers in DB for sticky answers 305 my %answersToStore; 306 my %answerHash = %{ $pg->{answers} }; 307 $answersToStore{$_} = $answerHash{$_}->{original_student_ans} 308 foreach (keys %answerHash); 309 my $answerString = encodeAnswers(%answersToStore, 310 @{ $pg->{flags}->{ANSWER_ENTRY_ORDER} }); 311 $problem->last_answer($answerString); 312 $wwdb->setProblem($problem); 313 314 # store state in DB if it makes sense 315 if ($will{recordAnswers}) { 316 $problem->attempted(1); 317 $problem->status($pg->{state}->{recorded_score}); 318 $problem->num_correct($pg->{state}->{num_of_correct_ans}); 319 $problem->num_incorrect($pg->{state}->{num_of_incorrect_ans}); 320 $wwdb->setProblem($problem); 321 # write to the transaction log, just to make sure 322 writeLog($self->{courseEnvironment}, "transaction", 323 $problem->id."\t". 324 $problem->set_id."\t". 325 $problem->login_id."\t". 326 $problem->source_file."\t". 327 $problem->value."\t". 328 $problem->max_attempts."\t". 329 $problem->problem_seed."\t". 330 $problem->status."\t". 331 $problem->attempted."\t". 332 $problem->last_answer."\t". 333 $problem->num_correct."\t". 334 $problem->num_incorrect 335 ); 336 } 337 } 338 339 ##### output ##### 340 print CGI::start_div({class=>"problemHeader"}); 341 # attempt summary 342 if ($submitAnswers or $will{showCorrectAnswers}) { 343 # print this if user submitted answers OR requested correct answers 344 print $self->attemptResults($pg, $submitAnswers, 345 $will{showCorrectAnswers}, 346 $pg->{flags}->{showPartialCorrectAnswers}, 1, 0); 347 } elsif ($checkAnswers) { 348 # print this if user previewed answers 349 print $self->attemptResults($pg, 1, 0, 1, 1, 0); 350 # show attempt answers 351 # don't show correct answers 352 # show attempt results (correctness) 353 # don't show attempt previews 354 } elsif ($previewAnswers) { 355 # print this if user previewed answers 356 print $self->attemptResults($pg, 1, 0, 0, 0, 1); 357 # show attempt answers 358 # don't show correct answers 359 # don't show attempt results (correctness) 360 # show attempt previews 361 } 362 363 print CGI::end_div(); 364 365 print CGI::start_div({class=>"problem"}); 366 #print CGI::hr(); 367 # main form 368 print 369 CGI::startform("POST", $r->uri), 370 $self->hidden_authen_fields, 371 CGI::p($pg->{body_text}), 372 CGI::p($pg->{result}->{msg} ? CGI::b("Note: ") : "", CGI::i($pg->{result}->{msg})), 373 CGI::p( 374 ($can{recordAnswers} 375 ? CGI::submit(-name=>"submitAnswers", 376 -label=>"Submit Answers") 377 : ""), 378 ($can{checkAnswers} 379 ? CGI::submit(-name=>"checkAnswers", 380 -label=>"Check Answers") 381 : ""), 382 CGI::submit(-name=>"previewAnswers", 383 -label=>"Preview Answers"), 384 ); 385 # score summary 386 my $attempts = $problem->num_correct + $problem->num_incorrect; 387 my $attemptsNoun = $attempts != 1 ? "times" : "time"; 388 my $lastScore = int ($problem->status * 100) . "%"; 389 my ($attemptsLeft, $attemptsLeftNoun); 390 if ($problem->max_attempts == -1) { 391 # unlimited attempts 392 $attemptsLeft = "unlimited"; 393 $attemptsLeftNoun = "attempts"; 394 } else { 395 $attemptsLeft = $problem->max_attempts - $attempts; 396 $attemptsLeftNoun = $attemptsLeft == 1 ? "attempt" : "attempts"; 397 } 398 399 my $setClosed = 0; 400 my $setClosedMessage; 401 if (time < $set->open_date or time > $set->due_date) { 402 $setClosed = 1; 403 $setClosedMessage = "This problem set is closed."; 404 if ($permissionLevel > 0) { 405 $setClosedMessage .= " Since you are a privileged user, additional attempts will be recorded."; 406 } else { 407 $setClosedMessage .= " Additional attempts will not be recorded."; 408 } 409 } 410 print CGI::p( 411 "You have attempted this problem $attempts $attemptsNoun.", CGI::br(), 412 $problem->attempted 413 ? "Your recorded score is $lastScore." . CGI::br() 414 : "", 415 $setClosed ? $setClosedMessage : "You have $attemptsLeft $attemptsLeftNoun remaining." 416 ); 417 418 print 419 $self->viewOptions(), 420 CGI::endform(); 421 422 print CGI::end_div(); 423 # feedback form 424 my $ce = $self->{courseEnvironment}; 425 my $root = $ce->{webworkURLs}->{root}; 426 my $courseName = $ce->{courseName}; 427 my $feedbackURL = "$root/$courseName/feedback/"; 428 print 429 CGI::startform("POST", $feedbackURL), 430 $self->hidden_authen_fields, 431 CGI::hidden("module", __PACKAGE__), 432 CGI::hidden("set", $set->id), 433 CGI::hidden("problem", $problem->id), 434 CGI::hidden("displayMode", $self->{displayMode}), 435 CGI::hidden("showOldAnswers", $will{showOldAnswers}), 436 CGI::hidden("showCorrectAnswers", $will{showCorrectAnswers}), 437 CGI::hidden("showHints", $will{showHints}), 438 CGI::hidden("showSolutions", $will{showSolutions}), 439 CGI::p({-align=>"right"}, 440 CGI::submit(-name=>"feedbackForm", -label=>"Send Feedback") 441 ), 442 CGI::endform(); 443 444 # warning output 445 if ($pg->{warnings} ne "") { 446 print CGI::hr(), $self->warningOutput($pg->{warnings}); 447 } 448 449 # debugging stuff 450 if (0) { 451 print 452 CGI::hr(), 453 CGI::h2("debugging information"), 454 CGI::h3("form fields"), 455 ref2string($self->{formFields}), 456 CGI::h3("user object"), 457 ref2string($self->{user}), 458 CGI::h3("set object"), 459 ref2string($set), 460 CGI::h3("problem object"), 461 ref2string($problem), 462 CGI::h3("PG object"), 463 ref2string($pg, {'WeBWorK::PG::Translator' => 1}); 464 } 465 466 return ""; 467 } 468 469 ##### output utilities ##### 470 471 sub attemptResults($$$$$$) { 472 my $self = shift; 473 my $pg = shift; 474 my $showAttemptAnswers = shift; 475 my $showCorrectAnswers = shift; 476 my $showAttemptResults = $showAttemptAnswers && shift; 477 my $showSummary = shift; 478 my $showAttemptPreview = shift || 0; 479 my $problemResult = $pg->{result}; # the overall result of the problem 480 my @answerNames = @{ $pg->{flags}->{ANSWER_ENTRY_ORDER} }; 481 482 my $showMessages = $showAttemptAnswers && grep { $pg->{answers}->{$_}->{ans_message} } @answerNames; 483 484 my $header = CGI::th("Part"); 485 $header .= $showAttemptAnswers ? CGI::th("Entered") : ""; 486 $header .= $showAttemptPreview ? CGI::th("Answer Preview") : ""; 487 $header .= $showCorrectAnswers ? CGI::th("Correct") : ""; 488 $header .= $showAttemptResults ? CGI::th("Result") : ""; 489 $header .= $showMessages ? CGI::th("messages") : ""; 490 my @tableRows = ( $header ); 491 my $numCorrect; 492 foreach my $name (@answerNames) { 493 my $answerResult = $pg->{answers}->{$name}; 494 my $studentAnswer = $answerResult->{student_ans}; # original_student_ans 495 my $preview = ($showAttemptPreview 496 ? $self->previewAnswer($answerResult) 497 : ""); 498 my $correctAnswer = $answerResult->{correct_ans}; 499 my $answerScore = $answerResult->{score}; 500 my $answerMessage = $showMessages ? $answerResult->{ans_message} : ""; 501 502 $numCorrect += $answerScore > 0; 503 my $resultString = $answerScore ? "correct" : "incorrect"; 504 505 # get rid of the goofy prefix on the answer names (supposedly, the format 506 # of the answer names is changeable. this only fixes it for "AnSwEr" 507 $name =~ s/^AnSwEr//; 508 509 my $row = CGI::td($name); 510 $row .= $showAttemptAnswers ? CGI::td($studentAnswer) : ""; 511 $row .= $showAttemptPreview ? CGI::td($preview) : ""; 512 $row .= $showCorrectAnswers ? CGI::td($correctAnswer) : ""; 513 $row .= $showAttemptResults ? CGI::td($resultString) : ""; 514 $row .= $answerMessage ? CGI::td($answerMessage) : ""; 515 push @tableRows, $row; 516 } 517 518 my $numIncorrectNoun = scalar @answerNames == 1 ? "question" : "questions"; 519 my $scorePercent = int ($problemResult->{score} * 100) . "\%"; 520 my $summary = "On this attempt, you answered $numCorrect out of " 521 . scalar @answerNames . " $numIncorrectNoun correct, for a score of $scorePercent."; 522 return CGI::table({-class=>"attemptResults"}, CGI::Tr(\@tableRows)) . ($showSummary ? CGI::p($summary) : ""); 523 } 524 525 sub viewOptions($) { 526 my $self = shift; 527 my $displayMode = $self->{displayMode}; 528 my %must = %{ $self->{must} }; 529 my %can = %{ $self->{can} }; 530 my %will = %{ $self->{will} }; 531 532 my $optionLine; 533 $can{showOldAnswers} and $optionLine .= join "", 534 "Show: ", 535 CGI::checkbox( 536 -name => "showOldAnswers", 537 -checked => $will{showOldAnswers}, 538 -label => "Saved answers", 539 ), " "; 540 $can{showCorrectAnswers} and $optionLine .= join "", 541 CGI::checkbox( 542 -name => "showCorrectAnswers", 543 -checked => $will{showCorrectAnswers}, 544 -label => "Correct answers", 545 ), " "; 546 $can{showHints} and $optionLine .= join "", 547 CGI::checkbox( 548 -name => "showHints", 549 -checked => $will{showHints}, 550 -label => "Hints", 551 ), " "; 552 $can{showSolutions} and $optionLine .= join "", 553 CGI::checkbox( 554 -name => "showSolutions", 555 -checked => $will{showSolutions}, 556 -label => "Solutions", 557 ), " "; 558 $optionLine and $optionLine .= join "", CGI::br(); 559 560 return CGI::div({-style=>"border: thin groove; padding: 1ex; margin: 2ex"}, 561 "View equations as: ", 562 CGI::radio_group( 563 -name => "displayMode", 564 -values => ['plainText', 'formattedText', 'images'], 565 -default => $displayMode, 566 -labels => { 567 plainText => "plain text", 568 formattedText => "formatted text", 569 images => "images", 570 } 571 ), CGI::br(), 572 $optionLine, 573 CGI::submit(-name=>"redisplay", -label=>"Redisplay Problem"), 574 ); 575 } 576 577 sub previewAnswer($$) { 578 my ($self, $answerResult) = @_; 579 my $ce = $self->{courseEnvironment}; 580 my $effectiveUser = $self->{effectiveUser}; 581 my $set = $self->{set}; 582 my $problem = $self->{problem}; 583 my $displayMode = $self->{displayMode}; 584 585 # note: right now, we have to do things completely differently when we are 586 # rendering math from INSIDE the translator and from OUTSIDE the translator. 587 # so we'll just deal with each case explicitly here. there's some code 588 # duplication that can be dealt with later by abstracting out tth/dvipng/etc. 589 590 my $tex = $answerResult->{preview_latex_string}; 591 592 return "" unless $tex; 593 594 if ($displayMode eq "plainText") { 595 return $tex; 596 } elsif ($displayMode eq "formattedText") { 597 my $tthCommand = $ce->{externalPrograms}->{tth} 598 . " -L -f5 -r 2> /dev/null <<END_OF_INPUT; echo > /dev/null\n" 599 . "\\(".$tex."\\)\n" 600 . "END_OF_INPUT\n"; 601 602 # call tth 603 my $result = `$tthCommand`; 604 if ($?) { 605 return "<b>[tth failed: $? $@]</b>"; 606 } 607 return $result; 608 } elsif ($displayMode eq "images") { 609 # how are we going to name this? 610 my $targetPathCommon = "/png/" 611 . $effectiveUser->id . "." 612 . $set->id . "." 613 . $problem->id . "." 614 . $answerResult->{ans_name} . ".png"; 615 616 # figure out where to put things 617 my $wd = tempdir("webwork-dvipng-XXXXXXXX", DIR => $ce->{courseDirs}->{html_temp}); 618 my $latex = $ce->{externalPrograms}->{latex}; 619 my $dvipng = $ce->{externalPrograms}->{dvipng}; 620 my $targetPath = $ce->{courseDirs}->{html_temp} . $targetPathCommon; 621 # should use surePathToTmpFile, but we have to 622 # isolate it from the problem enivronment first 623 my $targetURL = $ce->{courseURLs}->{html_temp} . $targetPathCommon; 624 625 # call dvipng to generate a preview 626 warn $tex; 627 dvipng($wd, $latex, $dvipng, $tex, $targetPath); 628 if (-e $targetPath) { 629 return "<img src=\"$targetURL\" alt=\"$tex\" />"; 630 } else { 631 return "<b>[math2img failed]</b>"; 632 } 633 } 634 } 635 636 ##### permission queries ##### 637 638 # this stuff should be abstracted out into the permissions system 639 # however, the permission system only knows about things in the 640 # course environment and the username. hmmm... 641 642 # also, i should fix these so that they have a consistent calling 643 # format -- perhaps: 644 # canPERM($courseEnv, $user, $set, $problem, $permissionLevel) 645 646 sub canShowCorrectAnswers($$) { 647 my ($permissionLevel, $answerDate) = @_; 648 return $permissionLevel > 0 || time > $answerDate; 649 } 650 651 sub canShowSolutions($$) { 652 my ($permissionLevel, $answerDate) = @_; 653 return canShowCorrectAnswers($permissionLevel, $answerDate); 654 } 655 656 sub canRecordAnswers($$$$$) { 657 my ($permissionLevel, $openDate, $dueDate, $maxAttempts, $attempts) = @_; 658 my $permHigh = $permissionLevel > 0; 659 my $timeOK = time >= $openDate && time <= $dueDate; 660 my $attemptsOK = $maxAttempts == -1 || $attempts <= $maxAttempts; 661 my $recordAnswers = $permHigh || ($timeOK && $attemptsOK); 662 return $recordAnswers; 663 } 664 665 sub canCheckAnswers($$) { 666 my ($permissionLevel, $answerDate) = @_; 667 my $permHigh = $permissionLevel > 0; 668 my $timeOK = time >= $answerDate; 669 my $recordAnswers = $permHigh || $timeOK; 670 return $recordAnswers; 671 } 672 673 sub mustRecordAnswers($) { 674 my ($permissionLevel) = @_; 675 return $permissionLevel == 0; 676 } 677 678 1;
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