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Added code for logging student answers and allowing instructors to inspect previous answers from students.
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 # logging student answers 339 my $pastAnswerLog = undef; 340 if (defined( $self->{courseEnvironment}->{webworkFiles}->{logs}->{'pastAnswerList'} )) { 341 342 $pastAnswerLog = $self->{courseEnvironment}->{webworkFiles}->{logs}->{'pastAnswerList'}; 343 344 if ($submitAnswers and defined($pastAnswerLog) ) { 345 my $answerString = ""; 346 my %answerHash = %{ $pg->{answers} }; 347 $answerString = $answerString . $answerHash{$_}->{original_student_ans}."\t" 348 foreach (sort keys %answerHash); 349 writeLog($self->{courseEnvironment}, "pastAnswerList", 350 '|'.$problem->login_id. 351 '|'.$problem->set_id. 352 '|'.$problem->id.'|'."\t". 353 time()."\t". 354 $answerString, 355 356 ); 357 358 } 359 360 } 361 # end logging student answers 362 363 ##### output ##### 364 print CGI::start_div({class=>"problemHeader"}); 365 # attempt summary 366 if ($submitAnswers or $will{showCorrectAnswers}) { 367 # print this if user submitted answers OR requested correct answers 368 print $self->attemptResults($pg, $submitAnswers, 369 $will{showCorrectAnswers}, 370 $pg->{flags}->{showPartialCorrectAnswers}, 1, 0); 371 } elsif ($checkAnswers) { 372 # print this if user previewed answers 373 print $self->attemptResults($pg, 1, 0, 1, 1, 0); 374 # show attempt answers 375 # don't show correct answers 376 # show attempt results (correctness) 377 # don't show attempt previews 378 } elsif ($previewAnswers) { 379 # print this if user previewed answers 380 print $self->attemptResults($pg, 1, 0, 0, 0, 1); 381 # show attempt answers 382 # don't show correct answers 383 # don't show attempt results (correctness) 384 # show attempt previews 385 } 386 387 print CGI::end_div(); 388 389 print CGI::start_div({class=>"problem"}); 390 #print CGI::hr(); 391 # main form 392 print 393 CGI::startform("POST", $r->uri), 394 $self->hidden_authen_fields, 395 CGI::p($pg->{body_text}), 396 CGI::p($pg->{result}->{msg} ? CGI::b("Note: ") : "", CGI::i($pg->{result}->{msg})), 397 CGI::p( 398 ($can{recordAnswers} 399 ? CGI::submit(-name=>"submitAnswers", 400 -label=>"Submit Answers") 401 : ""), 402 ($can{checkAnswers} 403 ? CGI::submit(-name=>"checkAnswers", 404 -label=>"Check Answers") 405 : ""), 406 CGI::submit(-name=>"previewAnswers", 407 -label=>"Preview Answers"), 408 ); 409 print CGI::end_div(); 410 411 print CGI::start_div({class=>"scoreSummary"}); 412 # score summary 413 my $attempts = $problem->num_correct + $problem->num_incorrect; 414 my $attemptsNoun = $attempts != 1 ? "times" : "time"; 415 my $lastScore = int ($problem->status * 100) . "%"; 416 my ($attemptsLeft, $attemptsLeftNoun); 417 if ($problem->max_attempts == -1) { 418 # unlimited attempts 419 $attemptsLeft = "unlimited"; 420 $attemptsLeftNoun = "attempts"; 421 } else { 422 $attemptsLeft = $problem->max_attempts - $attempts; 423 $attemptsLeftNoun = $attemptsLeft == 1 ? "attempt" : "attempts"; 424 } 425 426 my $setClosed = 0; 427 my $setClosedMessage; 428 if (time < $set->open_date or time > $set->due_date) { 429 $setClosed = 1; 430 $setClosedMessage = "This problem set is closed."; 431 if ($permissionLevel > 0) { 432 $setClosedMessage .= " Since you are a privileged user, additional attempts will be recorded."; 433 } else { 434 $setClosedMessage .= " Additional attempts will not be recorded."; 435 } 436 } 437 print CGI::p( 438 "You have attempted this problem $attempts $attemptsNoun.", CGI::br(), 439 $problem->attempted 440 ? "Your recorded score is $lastScore." . CGI::br() 441 : "", 442 $setClosed ? $setClosedMessage : "You have $attemptsLeft $attemptsLeftNoun remaining." 443 ); 444 print CGI::end_div(); 445 print CGI::hr(), CGI::start_div({class=>"viewOptions"}); 446 print 447 $self->viewOptions(),CGI::end_div(), 448 CGI::endform(); 449 450 print CGI::start_div({class=>"problemFooter"}); 451 # feedback form 452 my $ce = $self->{courseEnvironment}; 453 my $root = $ce->{webworkURLs}->{root}; 454 my $courseName = $ce->{courseName}; 455 my $feedbackURL = "$root/$courseName/feedback/"; 456 457 # arguments for answer inspection button 458 my $prof_url = $ce->{webworkURLs}->{oldProf}; 459 my $cgi_url = $prof_url; 460 $cgi_url=~ s|/[^/]*$||; # clip profLogin.pl 461 my $authen_args = $self->url_authen_args(); 462 my $showPastAnswersURL = "$cgi_url/showPastAnswers.pl"; 463 464 #print feedback form 465 print 466 CGI::start_form(-method=>"POST", -action=>$feedbackURL),"\n", 467 $self->hidden_authen_fields,"\n", 468 CGI::hidden("module", __PACKAGE__),"\n", 469 CGI::hidden("set", $set->id),"\n", 470 CGI::hidden("problem", $problem->id),"\n", 471 CGI::hidden("displayMode", $self->{displayMode}),"\n", 472 CGI::hidden("showOldAnswers", $will{showOldAnswers}),"\n", 473 CGI::hidden("showCorrectAnswers", $will{showCorrectAnswers}),"\n", 474 CGI::hidden("showHints", $will{showHints}),"\n", 475 CGI::hidden("showSolutions", $will{showSolutions}),"\n", 476 CGI::p({-align=>"right"}, 477 CGI::submit(-name=>"feedbackForm", -label=>"Send Feedback") 478 ), 479 CGI::endform(),"\n"; 480 # print answer inspection button 481 if ($self->{permissionLevel} >0) { 482 483 484 print "\n", 485 CGI::start_form(-method=>"POST",-action=>$showPastAnswersURL,-target=>"information"),"\n", 486 $self->hidden_authen_fields,"\n", 487 CGI::hidden(-name => 'course', -value=>$courseName), "\n", 488 CGI::hidden(-name => 'probNum', -value=>$problem->id), "\n", 489 CGI::hidden(-name => 'setNum', -value=>$problem->set_id), "\n", 490 CGI::hidden(-name => 'User', -value=>$problem->login_id), "\n", 491 CGI::submit(-name => 'action', -value=>'Show Past Answers'), "\n", 492 CGI::endform(); 493 494 495 496 } 497 print CGI::end_div(); 498 # end answer inspection button 499 # warning output 500 if ($pg->{warnings} ne "") { 501 print CGI::hr(), $self->warningOutput($pg->{warnings}); 502 } 503 504 # debugging stuff 505 if (0) { 506 print 507 CGI::hr(), 508 CGI::h2("debugging information"), 509 CGI::h3("form fields"), 510 ref2string($self->{formFields}), 511 CGI::h3("user object"), 512 ref2string($self->{user}), 513 CGI::h3("set object"), 514 ref2string($set), 515 CGI::h3("problem object"), 516 ref2string($problem), 517 CGI::h3("PG object"), 518 ref2string($pg, {'WeBWorK::PG::Translator' => 1}); 519 } 520 521 return ""; 522 } 523 524 ##### output utilities ##### 525 526 sub attemptResults($$$$$$) { 527 my $self = shift; 528 my $pg = shift; 529 my $showAttemptAnswers = shift; 530 my $showCorrectAnswers = shift; 531 my $showAttemptResults = $showAttemptAnswers && shift; 532 my $showSummary = shift; 533 my $showAttemptPreview = shift || 0; 534 my $problemResult = $pg->{result}; # the overall result of the problem 535 my @answerNames = @{ $pg->{flags}->{ANSWER_ENTRY_ORDER} }; 536 537 my $showMessages = $showAttemptAnswers && grep { $pg->{answers}->{$_}->{ans_message} } @answerNames; 538 539 my $header = CGI::th("Part"); 540 $header .= $showAttemptAnswers ? CGI::th("Entered") : ""; 541 $header .= $showAttemptPreview ? CGI::th("Answer Preview") : ""; 542 $header .= $showCorrectAnswers ? CGI::th("Correct") : ""; 543 $header .= $showAttemptResults ? CGI::th("Result") : ""; 544 $header .= $showMessages ? CGI::th("messages") : ""; 545 my @tableRows = ( $header ); 546 my $numCorrect; 547 foreach my $name (@answerNames) { 548 my $answerResult = $pg->{answers}->{$name}; 549 my $studentAnswer = $answerResult->{student_ans}; # original_student_ans 550 my $preview = ($showAttemptPreview 551 ? $self->previewAnswer($answerResult) 552 : ""); 553 my $correctAnswer = $answerResult->{correct_ans}; 554 my $answerScore = $answerResult->{score}; 555 my $answerMessage = $showMessages ? $answerResult->{ans_message} : ""; 556 557 $numCorrect += $answerScore > 0; 558 my $resultString = $answerScore ? "correct" : "incorrect"; 559 560 # get rid of the goofy prefix on the answer names (supposedly, the format 561 # of the answer names is changeable. this only fixes it for "AnSwEr" 562 $name =~ s/^AnSwEr//; 563 564 my $row = CGI::td($name); 565 $row .= $showAttemptAnswers ? CGI::td($studentAnswer) : ""; 566 $row .= $showAttemptPreview ? CGI::td($preview) : ""; 567 $row .= $showCorrectAnswers ? CGI::td($correctAnswer) : ""; 568 $row .= $showAttemptResults ? CGI::td($resultString) : ""; 569 $row .= $answerMessage ? CGI::td($answerMessage) : ""; 570 push @tableRows, $row; 571 } 572 573 my $numIncorrectNoun = scalar @answerNames == 1 ? "question" : "questions"; 574 my $scorePercent = int ($problemResult->{score} * 100) . "\%"; 575 my $summary = "On this attempt, you answered $numCorrect out of " 576 . scalar @answerNames . " $numIncorrectNoun correct, for a score of $scorePercent."; 577 return CGI::table({-class=>"attemptResults"}, CGI::Tr(\@tableRows)) . ($showSummary ? CGI::p($summary) : ""); 578 } 579 580 sub viewOptions($) { 581 my $self = shift; 582 my $displayMode = $self->{displayMode}; 583 my %must = %{ $self->{must} }; 584 my %can = %{ $self->{can} }; 585 my %will = %{ $self->{will} }; 586 587 my $optionLine; 588 $can{showOldAnswers} and $optionLine .= join "", 589 "Show: ", 590 CGI::checkbox( 591 -name => "showOldAnswers", 592 -checked => $will{showOldAnswers}, 593 -label => "Saved answers", 594 ), " "; 595 $can{showCorrectAnswers} and $optionLine .= join "", 596 CGI::checkbox( 597 -name => "showCorrectAnswers", 598 -checked => $will{showCorrectAnswers}, 599 -label => "Correct answers", 600 ), " "; 601 $can{showHints} and $optionLine .= join "", 602 CGI::checkbox( 603 -name => "showHints", 604 -checked => $will{showHints}, 605 -label => "Hints", 606 ), " "; 607 $can{showSolutions} and $optionLine .= join "", 608 CGI::checkbox( 609 -name => "showSolutions", 610 -checked => $will{showSolutions}, 611 -label => "Solutions", 612 ), " "; 613 $optionLine and $optionLine .= join "", CGI::br(); 614 615 return CGI::div({-style=>"border: thin groove; padding: 1ex; margin: 2ex"}, 616 "View equations as: ", 617 CGI::radio_group( 618 -name => "displayMode", 619 -values => ['plainText', 'formattedText', 'images'], 620 -default => $displayMode, 621 -labels => { 622 plainText => "plain text", 623 formattedText => "formatted text", 624 images => "images", 625 } 626 ), CGI::br(), 627 $optionLine, 628 CGI::submit(-name=>"redisplay", -label=>"Redisplay Problem"), 629 ); 630 } 631 632 sub previewAnswer($$) { 633 my ($self, $answerResult) = @_; 634 my $ce = $self->{courseEnvironment}; 635 my $effectiveUser = $self->{effectiveUser}; 636 my $set = $self->{set}; 637 my $problem = $self->{problem}; 638 my $displayMode = $self->{displayMode}; 639 640 # note: right now, we have to do things completely differently when we are 641 # rendering math from INSIDE the translator and from OUTSIDE the translator. 642 # so we'll just deal with each case explicitly here. there's some code 643 # duplication that can be dealt with later by abstracting out tth/dvipng/etc. 644 645 my $tex = $answerResult->{preview_latex_string}; 646 647 return "" unless $tex; 648 649 if ($displayMode eq "plainText") { 650 return $tex; 651 } elsif ($displayMode eq "formattedText") { 652 my $tthCommand = $ce->{externalPrograms}->{tth} 653 . " -L -f5 -r 2> /dev/null <<END_OF_INPUT; echo > /dev/null\n" 654 . "\\(".$tex."\\)\n" 655 . "END_OF_INPUT\n"; 656 657 # call tth 658 my $result = `$tthCommand`; 659 if ($?) { 660 return "<b>[tth failed: $? $@]</b>"; 661 } 662 return $result; 663 } elsif ($displayMode eq "images") { 664 # how are we going to name this? 665 my $targetPathCommon = "/png/" 666 . $effectiveUser->id . "." 667 . $set->id . "." 668 . $problem->id . "." 669 . $answerResult->{ans_name} . ".png"; 670 671 # figure out where to put things 672 my $wd = tempdir("webwork-dvipng-XXXXXXXX", DIR => $ce->{courseDirs}->{html_temp}); 673 my $latex = $ce->{externalPrograms}->{latex}; 674 my $dvipng = $ce->{externalPrograms}->{dvipng}; 675 my $targetPath = $ce->{courseDirs}->{html_temp} . $targetPathCommon; 676 # should use surePathToTmpFile, but we have to 677 # isolate it from the problem enivronment first 678 my $targetURL = $ce->{courseURLs}->{html_temp} . $targetPathCommon; 679 680 # call dvipng to generate a preview 681 warn $tex; 682 dvipng($wd, $latex, $dvipng, $tex, $targetPath); 683 if (-e $targetPath) { 684 return "<img src=\"$targetURL\" alt=\"$tex\" />"; 685 } else { 686 return "<b>[math2img failed]</b>"; 687 } 688 } 689 } 690 ##### logging subroutine #### 691 692 693 694 ##### permission queries ##### 695 696 # this stuff should be abstracted out into the permissions system 697 # however, the permission system only knows about things in the 698 # course environment and the username. hmmm... 699 700 # also, i should fix these so that they have a consistent calling 701 # format -- perhaps: 702 # canPERM($courseEnv, $user, $set, $problem, $permissionLevel) 703 704 sub canShowCorrectAnswers($$) { 705 my ($permissionLevel, $answerDate) = @_; 706 return $permissionLevel > 0 || time > $answerDate; 707 } 708 709 sub canShowSolutions($$) { 710 my ($permissionLevel, $answerDate) = @_; 711 return canShowCorrectAnswers($permissionLevel, $answerDate); 712 } 713 714 sub canRecordAnswers($$$$$) { 715 my ($permissionLevel, $openDate, $dueDate, $maxAttempts, $attempts) = @_; 716 my $permHigh = $permissionLevel > 0; 717 my $timeOK = time >= $openDate && time <= $dueDate; 718 my $attemptsOK = $maxAttempts == -1 || $attempts <= $maxAttempts; 719 my $recordAnswers = $permHigh || ($timeOK && $attemptsOK); 720 return $recordAnswers; 721 } 722 723 sub canCheckAnswers($$) { 724 my ($permissionLevel, $answerDate) = @_; 725 my $permHigh = $permissionLevel > 0; 726 my $timeOK = time >= $answerDate; 727 my $recordAnswers = $permHigh || $timeOK; 728 return $recordAnswers; 729 } 730 731 sub mustRecordAnswers($) { 732 my ($permissionLevel) = @_; 733 return $permissionLevel == 0; 734 } 735 736 1;
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