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Began adding CSS escapes to some generated HTML structures. Addressed some bug reports that came in from the mailing list. -Dennis
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", "ProbList"); 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 : "") , "Prev"; 260 push @links, "Next Problem" , ($nextProblem 261 ? "$root/$courseName/$setName/".$nextProblem->id 262 : "") , "Next"; 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 $problem->num_incorrect 337 ); 338 } 339 } 340 341 ##### output ##### 342 print CGI::start_div({class=>"problemHeader"}); 343 # attempt summary 344 if ($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 $pg->{flags}->{showPartialCorrectAnswers}, 1, 0); 349 } elsif ($checkAnswers) { 350 # print this if user previewed answers 351 print $self->attemptResults($pg, 1, 0, 1, 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, 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 print CGI::end_div(); 366 367 print CGI::start_div({class=>"problem"}); 368 #print CGI::hr(); 369 # main form 370 print 371 CGI::startform("POST", $r->uri), 372 $self->hidden_authen_fields, 373 CGI::p($pg->{body_text}), 374 CGI::p($pg->{result}->{msg} ? CGI::b("Note: ") : "", CGI::i($pg->{result}->{msg})), 375 CGI::p( 376 ($can{recordAnswers} 377 ? CGI::submit(-name=>"submitAnswers", 378 -label=>"Submit Answers") 379 : ""), 380 ($can{checkAnswers} 381 ? CGI::submit(-name=>"checkAnswers", 382 -label=>"Check Answers") 383 : ""), 384 CGI::submit(-name=>"previewAnswers", 385 -label=>"Preview Answers"), 386 ); 387 # score summary 388 my $attempts = $problem->num_correct + $problem->num_incorrect; 389 my $attemptsNoun = $attempts != 1 ? "times" : "time"; 390 my $lastScore = int ($problem->status * 100) . "%"; 391 my ($attemptsLeft, $attemptsLeftNoun); 392 if ($problem->max_attempts == -1) { 393 # unlimited attempts 394 $attemptsLeft = "unlimited"; 395 $attemptsLeftNoun = "attempts"; 396 } else { 397 $attemptsLeft = $problem->max_attempts - $attempts; 398 $attemptsLeftNoun = $attemptsLeft == 1 ? "attempt" : "attempts"; 399 } 400 401 my $setClosed = 0; 402 my $setClosedMessage; 403 if (time < $set->open_date or time > $set->due_date) { 404 $setClosed = 1; 405 $setClosedMessage = "This problem set is closed."; 406 if ($permissionLevel > 0) { 407 $setClosedMessage .= " Since you are a privileged user, additional attempts will be recorded."; 408 } else { 409 $setClosedMessage .= " Additional attempts will not be recorded."; 410 } 411 } 412 print CGI::p( 413 "You have attempted this problem $attempts $attemptsNoun.", CGI::br(), 414 $problem->attempted 415 ? "Your recorded score is $lastScore." . CGI::br() 416 : "", 417 $setClosed ? $setClosedMessage : "You have $attemptsLeft $attemptsLeftNoun remaining." 418 ); 419 420 421 print 422 $self->viewOptions(), 423 CGI::endform(); 424 425 print CGI::end_div(); 426 # feedback form 427 my $ce = $self->{courseEnvironment}; 428 my $root = $ce->{webworkURLs}->{root}; 429 my $courseName = $ce->{courseName}; 430 my $feedbackURL = "$root/$courseName/feedback/"; 431 print 432 CGI::startform("POST", $feedbackURL), 433 $self->hidden_authen_fields, 434 CGI::hidden("module", __PACKAGE__), 435 CGI::hidden("set", $set->id), 436 CGI::hidden("problem", $problem->id), 437 CGI::hidden("displayMode", $self->{displayMode}), 438 CGI::hidden("showOldAnswers", $will{showOldAnswers}), 439 CGI::hidden("showCorrectAnswers", $will{showCorrectAnswers}), 440 CGI::hidden("showHints", $will{showHints}), 441 CGI::hidden("showSolutions", $will{showSolutions}), 442 CGI::p({-align=>"right"}, 443 CGI::submit(-name=>"feedbackForm", -label=>"Send Feedback") 444 ), 445 CGI::endform(); 446 447 # warning output 448 if ($pg->{warnings} ne "") { 449 print CGI::hr(), $self->warningOutput($pg->{warnings}); 450 } 451 452 # debugging stuff 453 if (0) { 454 print 455 CGI::hr(), 456 CGI::h2("debugging information"), 457 CGI::h3("form fields"), 458 ref2string($self->{formFields}), 459 CGI::h3("user object"), 460 ref2string($self->{user}), 461 CGI::h3("set object"), 462 ref2string($set), 463 CGI::h3("problem object"), 464 ref2string($problem), 465 CGI::h3("PG object"), 466 ref2string($pg, {'WeBWorK::PG::Translator' => 1}); 467 } 468 469 return ""; 470 } 471 472 ##### output utilities ##### 473 474 sub attemptResults($$$$$$) { 475 my $self = shift; 476 my $pg = shift; 477 my $showAttemptAnswers = shift; 478 my $showCorrectAnswers = shift; 479 my $showAttemptResults = $showAttemptAnswers && shift; 480 my $showSummary = shift; 481 my $showAttemptPreview = shift || 0; 482 my $problemResult = $pg->{result}; # the overall result of the problem 483 my @answerNames = @{ $pg->{flags}->{ANSWER_ENTRY_ORDER} }; 484 485 my $showMessages = $showAttemptAnswers && grep { $pg->{answers}->{$_}->{ans_message} } @answerNames; 486 487 my $header = CGI::th("Part"); 488 $header .= $showAttemptAnswers ? CGI::th("Entered") : ""; 489 $header .= $showAttemptPreview ? CGI::th("Answer Preview") : ""; 490 $header .= $showCorrectAnswers ? CGI::th("Correct") : ""; 491 $header .= $showAttemptResults ? CGI::th("Result") : ""; 492 $header .= $showMessages ? CGI::th("messages") : ""; 493 my @tableRows = ( $header ); 494 my $numCorrect; 495 foreach my $name (@answerNames) { 496 my $answerResult = $pg->{answers}->{$name}; 497 my $studentAnswer = $answerResult->{student_ans}; # original_student_ans 498 my $preview = ($showAttemptPreview 499 ? $self->previewAnswer($answerResult) 500 : ""); 501 my $correctAnswer = $answerResult->{correct_ans}; 502 my $answerScore = $answerResult->{score}; 503 my $answerMessage = $showMessages ? $answerResult->{ans_message} : ""; 504 505 $numCorrect += $answerScore > 0; 506 my $resultString = $answerScore ? "correct" : "incorrect"; 507 508 # get rid of the goofy prefix on the answer names (supposedly, the format 509 # of the answer names is changeable. this only fixes it for "AnSwEr" 510 $name =~ s/^AnSwEr//; 511 512 my $row = CGI::td($name); 513 $row .= $showAttemptAnswers ? CGI::td($studentAnswer) : ""; 514 $row .= $showAttemptPreview ? CGI::td($preview) : ""; 515 $row .= $showCorrectAnswers ? CGI::td($correctAnswer) : ""; 516 $row .= $showAttemptResults ? CGI::td($resultString) : ""; 517 $row .= $answerMessage ? CGI::td($answerMessage) : ""; 518 push @tableRows, $row; 519 } 520 521 my $numIncorrectNoun = scalar @answerNames == 1 ? "question" : "questions"; 522 my $scorePercent = int ($problemResult->{score} * 100) . "\%"; 523 my $summary = "On this attempt, you answered $numCorrect out of " 524 . scalar @answerNames . " $numIncorrectNoun correct, for a score of $scorePercent."; 525 return CGI::table({-class=>"attemptResults"}, CGI::Tr(\@tableRows)) . ($showSummary ? CGI::p($summary) : ""); 526 } 527 528 sub viewOptions($) { 529 my $self = shift; 530 my $displayMode = $self->{displayMode}; 531 my %must = %{ $self->{must} }; 532 my %can = %{ $self->{can} }; 533 my %will = %{ $self->{will} }; 534 535 my $optionLine; 536 $can{showOldAnswers} and $optionLine .= join "", 537 "Show: ", 538 CGI::checkbox( 539 -name => "showOldAnswers", 540 -checked => $will{showOldAnswers}, 541 -label => "Saved answers", 542 ), " "; 543 $can{showCorrectAnswers} and $optionLine .= join "", 544 CGI::checkbox( 545 -name => "showCorrectAnswers", 546 -checked => $will{showCorrectAnswers}, 547 -label => "Correct answers", 548 ), " "; 549 $can{showHints} and $optionLine .= join "", 550 CGI::checkbox( 551 -name => "showHints", 552 -checked => $will{showHints}, 553 -label => "Hints", 554 ), " "; 555 $can{showSolutions} and $optionLine .= join "", 556 CGI::checkbox( 557 -name => "showSolutions", 558 -checked => $will{showSolutions}, 559 -label => "Solutions", 560 ), " "; 561 $optionLine and $optionLine .= join "", CGI::br(); 562 563 return CGI::div({-style=>"border: thin groove; padding: 1ex; margin: 2ex"}, 564 "View equations as: ", 565 CGI::radio_group( 566 -name => "displayMode", 567 -values => ['plainText', 'formattedText', 'images'], 568 -default => $displayMode, 569 -labels => { 570 plainText => "plain text", 571 formattedText => "formatted text", 572 images => "images", 573 } 574 ), CGI::br(), 575 $optionLine, 576 CGI::submit(-name=>"redisplay", -label=>"Redisplay Problem"), 577 ); 578 } 579 580 sub previewAnswer($$) { 581 my ($self, $answerResult) = @_; 582 my $ce = $self->{courseEnvironment}; 583 my $effectiveUser = $self->{effectiveUser}; 584 my $set = $self->{set}; 585 my $problem = $self->{problem}; 586 my $displayMode = $self->{displayMode}; 587 588 # note: right now, we have to do things completely differently when we are 589 # rendering math from INSIDE the translator and from OUTSIDE the translator. 590 # so we'll just deal with each case explicitly here. there's some code 591 # duplication that can be dealt with later by abstracting out tth/dvipng/etc. 592 593 my $tex = $answerResult->{preview_latex_string}; 594 595 return "" unless $tex; 596 597 if ($displayMode eq "plainText") { 598 return $tex; 599 } elsif ($displayMode eq "formattedText") { 600 my $tthCommand = $ce->{externalPrograms}->{tth} 601 . " -L -f5 -r 2> /dev/null <<END_OF_INPUT; echo > /dev/null\n" 602 . "\\(".$tex."\\)\n" 603 . "END_OF_INPUT\n"; 604 605 # call tth 606 my $result = `$tthCommand`; 607 if ($?) { 608 return "<b>[tth failed: $? $@]</b>"; 609 } 610 return $result; 611 } elsif ($displayMode eq "images") { 612 # how are we going to name this? 613 my $targetPathCommon = "/png/" 614 . $effectiveUser->id . "." 615 . $set->id . "." 616 . $problem->id . "." 617 . $answerResult->{ans_name} . ".png"; 618 619 # figure out where to put things 620 my $wd = tempdir("webwork-dvipng-XXXXXXXX", DIR => $ce->{courseDirs}->{html_temp}); 621 my $latex = $ce->{externalPrograms}->{latex}; 622 my $dvipng = $ce->{externalPrograms}->{dvipng}; 623 my $targetPath = $ce->{courseDirs}->{html_temp} . $targetPathCommon; 624 # should use surePathToTmpFile, but we have to 625 # isolate it from the problem enivronment first 626 my $targetURL = $ce->{courseURLs}->{html_temp} . $targetPathCommon; 627 628 # call dvipng to generate a preview 629 warn $tex; 630 dvipng($wd, $latex, $dvipng, $tex, $targetPath); 631 if (-e $targetPath) { 632 return "<img src=\"$targetURL\" alt=\"$tex\" />"; 633 } else { 634 return "<b>[math2img failed]</b>"; 635 } 636 } 637 } 638 639 ##### permission queries ##### 640 641 # this stuff should be abstracted out into the permissions system 642 # however, the permission system only knows about things in the 643 # course environment and the username. hmmm... 644 645 # also, i should fix these so that they have a consistent calling 646 # format -- perhaps: 647 # canPERM($courseEnv, $user, $set, $problem, $permissionLevel) 648 649 sub canShowCorrectAnswers($$) { 650 my ($permissionLevel, $answerDate) = @_; 651 return $permissionLevel > 0 || time > $answerDate; 652 } 653 654 sub canShowSolutions($$) { 655 my ($permissionLevel, $answerDate) = @_; 656 return canShowCorrectAnswers($permissionLevel, $answerDate); 657 } 658 659 sub canRecordAnswers($$$$$) { 660 my ($permissionLevel, $openDate, $dueDate, $maxAttempts, $attempts) = @_; 661 my $permHigh = $permissionLevel > 0; 662 my $timeOK = time >= $openDate && time <= $dueDate; 663 my $attemptsOK = $maxAttempts == -1 || $attempts <= $maxAttempts; 664 my $recordAnswers = $permHigh || ($timeOK && $attemptsOK); 665 return $recordAnswers; 666 } 667 668 sub canCheckAnswers($$$$$) { 669 my ($permissionLevel, $openDate, $dueDate, $answerDate, $maxAttempts, $attempts) = @_; 670 return time >= $answerDate or canRecordAnswers($permissionLevel, $openDate, $dueDate, $maxAttempts, $attempts); 671 } 672 673 sub mustRecordAnswers($) { 674 my ($permissionLevel) = @_; 675 return $permissionLevel == 0; 676 } 677 678 1;
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