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changed ->id to ->whatever_id -sam
1 ################################################################################ 2 # WeBWorK mod_perl (c) 2000-2002 WeBWorK Project 3 # $Id$ 4 ################################################################################ 5 6 package WeBWorK::ContentGenerator::Problem; 7 use base qw(WeBWorK::ContentGenerator); 8 9 =head1 NAME 10 11 WeBWorK::ContentGenerator::Problem - Allow a student to interact with a problem. 12 13 =cut 14 15 use strict; 16 use warnings; 17 use CGI qw(); 18 use File::Path qw(rmtree); 19 use File::Temp qw(tempdir); 20 use WeBWorK::Form; 21 use WeBWorK::PG; 22 use WeBWorK::PG::IO; 23 use WeBWorK::Utils qw(writeLog encodeAnswers decodeAnswers ref2string); 24 25 ############################################################ 26 # 27 # user 28 # effectiveUser 29 # key 30 # 31 # displayMode 32 # showOldAnswers 33 # showCorrectAnswers 34 # showHints 35 # showSolutions 36 # 37 # AnSwEr# - answer blanks in problem 38 # 39 # redisplay - name of the "Redisplay Problem" button 40 # submitAnswers - name of "Submit Answers" button 41 # checkAnswers - name of the "Check Answers" button 42 # previewAnswers - name of the "Preview Answers" button 43 # 44 ############################################################ 45 46 sub pre_header_initialize { 47 my ($self, $setName, $problemNumber) = @_; 48 my $r = $self->{r}; 49 my $courseEnv = $self->{ce}; 50 my $db = $self->{db}; 51 my $userName = $r->param('user'); 52 my $effectiveUserName = $r->param('effectiveUser'); 53 54 my $user = $db->getUser($userName); 55 my $effectiveUser = $db->getUser($effectiveUserName); 56 my $set = $db->getGlobalUserSet($effectiveUserName, $setName); 57 my $problem = $db->getGlobalUserProblem($effectiveUserName, $setName, $problemNumber); 58 my $psvn = $set->psvn(); 59 my $permissionLevel = $db->getPermissionLevel($userName)->permission(); 60 61 $self->{userName} = $userName; 62 $self->{user} = $user; 63 $self->{effectiveUser} = $effectiveUser; 64 $self->{set} = $set; 65 $self->{problem} = $problem; 66 $self->{permissionLevel} = $permissionLevel; 67 68 ##### form processing ##### 69 70 # set options from form fields (see comment at top of file for names) 71 my $displayMode = $r->param("displayMode") || $courseEnv->{pg}->{options}->{displayMode}; 72 my $redisplay = $r->param("redisplay"); 73 my $submitAnswers = $r->param("submitAnswers"); 74 my $checkAnswers = $r->param("checkAnswers"); 75 my $previewAnswers = $r->param("previewAnswers"); 76 77 # coerce form fields into CGI::Vars format 78 my $formFields = { WeBWorK::Form->new_from_paramable($r)->Vars }; 79 80 $self->{displayMode} = $displayMode; 81 $self->{redisplay} = $redisplay; 82 $self->{submitAnswers} = $submitAnswers; 83 $self->{checkAnswers} = $checkAnswers; 84 $self->{previewAnswers} = $previewAnswers; 85 $self->{formFields} = $formFields; 86 87 ##### permissions ##### 88 89 # are we allowed to view this problem? 90 $self->{isOpen} = time >= $set->open_date || $permissionLevel > 0; 91 return unless $self->{isOpen}; 92 93 # what does the user want to do? 94 my %want = ( 95 showOldAnswers => $r->param("showOldAnswers") || $courseEnv->{pg}->{options}->{showOldAnswers}, 96 showCorrectAnswers => $r->param("showCorrectAnswers") || $courseEnv->{pg}->{options}->{showCorrectAnswers}, 97 showHints => $r->param("showHints") || $courseEnv->{pg}->{options}->{showHints}, 98 showSolutions => $r->param("showSolutions") || $courseEnv->{pg}->{options}->{showSolutions}, 99 recordAnswers => $submitAnswers, 100 checkAnswers => $checkAnswers, 101 ); 102 103 # are certain options enforced? 104 my %must = ( 105 showOldAnswers => 0, 106 showCorrectAnswers => 0, 107 showHints => 0, 108 showSolutions => 0, 109 recordAnswers => mustRecordAnswers($permissionLevel), 110 checkAnswers => 0, 111 ); 112 113 # does the user have permission to use certain options? 114 my %can = ( 115 showOldAnswers => 1, 116 showCorrectAnswers => canShowCorrectAnswers($permissionLevel, $set->answer_date), 117 showHints => 1, 118 showSolutions => canShowSolutions($permissionLevel, $set->answer_date), 119 recordAnswers => canRecordAnswers($permissionLevel, $set->open_date, $set->due_date, 120 $problem->max_attempts, $problem->num_correct + $problem->num_incorrect + 1), 121 # attempts=num_correct+num_incorrect+1, as this happens before updating $problem 122 checkAnswers => canCheckAnswers($permissionLevel, $set->answer_date), 123 ); 124 125 # final values for options 126 my %will; 127 foreach (keys %must) { 128 $will{$_} = $can{$_} && ($want{$_} || $must{$_}); 129 } 130 131 ##### sticky answers ##### 132 133 if (not $submitAnswers and $will{showOldAnswers}) { 134 # do this only if new answers are NOT being submitted 135 my %oldAnswers = decodeAnswers($problem->last_answer); 136 $formFields->{$_} = $oldAnswers{$_} foreach keys %oldAnswers; 137 } 138 139 ##### translation ##### 140 141 my $pg = WeBWorK::PG->new( 142 $courseEnv, 143 $effectiveUser, 144 $r->param('key'), 145 $set, 146 $problem, 147 $psvn, 148 $formFields, 149 { # translation options 150 displayMode => $displayMode, 151 showHints => $will{showHints}, 152 showSolutions => $will{showSolutions}, 153 refreshMath2img => $will{showHints} || $will{showSolutions}, 154 processAnswers => 1, 155 }, 156 ); 157 158 ##### fix hint/solution options ##### 159 160 $can{showHints} &&= $pg->{flags}->{hintExists}; 161 $can{showSolutions} &&= $pg->{flags}->{solutionExists}; 162 163 ##### store fields ##### 164 165 $self->{want} = \%want; 166 $self->{must} = \%must; 167 $self->{can} = \%can; 168 $self->{will} = \%will; 169 170 $self->{pg} = $pg; 171 } 172 173 sub if_warnings($$) { 174 my ($self, $arg) = @_; 175 return 0 unless $self->{isOpen}; 176 return $self->{pg}->{warnings} ne ""; 177 } 178 179 sub if_errors($$) { 180 my ($self, $arg) = @_; 181 return 0 unless $self->{isOpen}; 182 return $self->{pg}->{flags}->{error_flag}; 183 } 184 185 sub head { 186 my $self = shift; 187 return "" unless $self->{isOpen}; 188 return $self->{pg}->{head_text} if $self->{pg}->{head_text}; 189 } 190 191 sub path { 192 my $self = shift; 193 my $args = $_[-1]; 194 my $setName = $self->{set}->set_id; 195 my $problemNumber = $self->{problem}->problem_id; 196 197 my $ce = $self->{ce}; 198 my $root = $ce->{webworkURLs}->{root}; 199 my $courseName = $ce->{courseName}; 200 return $self->pathMacro($args, 201 "Home" => "$root", 202 $courseName => "$root/$courseName", 203 $setName => "$root/$courseName/$setName", 204 "Problem $problemNumber" => "", 205 ); 206 } 207 208 sub siblings { 209 my $self = shift; 210 my $setName = $self->{set}->set_id; 211 my $problemNumber = $self->{problem}->problem_id; 212 213 my $ce = $self->{ce}; 214 my $db = $self->{db}; 215 my $root = $ce->{webworkURLs}->{root}; 216 my $courseName = $ce->{courseName}; 217 218 print CGI::strong("Problems"), CGI::br(); 219 220 my $effectiveUser = $self->{r}->param("effectiveUser"); 221 my @problems; 222 push @problems, $db->getGlobalUserProblem($effectiveUser, $setName, $_) 223 foreach ($db->listUserProblems($effectiveUser, $setName)); 224 foreach my $problem (sort { $a->problem_id <=> $b->problem_id } @problems) { 225 print CGI::a({-href=>"$root/$courseName/$setName/".$problem->problem_id."/?" 226 . $self->url_authen_args . "&displayMode=" . $self->{displayMode}}, 227 "Problem ".$problem->problem_id), CGI::br(); 228 } 229 } 230 231 sub nav { 232 my $self = shift; 233 my $args = $_[-1]; 234 my $setName = $self->{set}->set_id; 235 my $problemNumber = $self->{problem}->problem_id; 236 237 my $ce = $self->{ce}; 238 my $db = $self->{db}; 239 my $root = $ce->{webworkURLs}->{root}; 240 my $courseName = $ce->{courseName}; 241 242 my $wwdb = $self->{wwdb}; 243 my $effectiveUser = $self->{r}->param("effectiveUser"); 244 my $tail = "&displayMode=".$self->{displayMode}; 245 246 my @links = ("Problem List" , "$root/$courseName/$setName", "navProbList"); 247 248 my $prevProblem = $db->getGlobalUserProblem($effectiveUser, $setName, $problemNumber-1); 249 my $nextProblem = $db->getGlobalUserProblem($effectiveUser, $setName, $problemNumber+1); 250 unshift @links, "Previous Problem" , ($prevProblem 251 ? "$root/$courseName/$setName/".$prevProblem->problem_id 252 : "") , "navPrev"; 253 push @links, "Next Problem" , ($nextProblem 254 ? "$root/$courseName/$setName/".$nextProblem->problem_id 255 : "") , "navNext"; 256 257 return $self->navMacro($args, $tail, @links); 258 } 259 260 sub title { 261 my $self = shift; 262 my $setName = $self->{set}->set_id; 263 my $problemNumber = $self->{problem}->problem_id; 264 265 return "$setName : Problem $problemNumber"; 266 } 267 268 sub body { 269 my $self = shift; 270 271 return CGI::p(CGI::font({-color=>"red"}, "This problem is not available because the problem set that contains it is not yet open.")) 272 unless $self->{isOpen}; 273 274 # unpack some useful variables 275 my $r = $self->{r}; 276 my $db = $self->{db}; 277 my $set = $self->{set}; 278 my $problem = $self->{problem}; 279 my $permissionLevel = $self->{permissionLevel}; 280 my $submitAnswers = $self->{submitAnswers}; 281 my $checkAnswers = $self->{checkAnswers}; 282 my $previewAnswers = $self->{previewAnswers}; 283 my %want = %{ $self->{want} }; 284 my %can = %{ $self->{can} }; 285 my %must = %{ $self->{must} }; 286 my %will = %{ $self->{will} }; 287 my $pg = $self->{pg}; 288 289 ##### translation errors? ##### 290 291 if ($pg->{flags}->{error_flag}) { 292 return $self->errorOutput($pg->{errors}, $pg->{body_text}); 293 } 294 295 ##### answer processing ##### 296 297 # if answers were submitted: 298 if ($submitAnswers) { 299 # get a "pure" (unmerged) UserProblem to modify 300 my $pureProblem = $db->getUserProblem($problem->user_id, $problem->set_id, $problem->problem_id); 301 # store answers in DB for sticky answers 302 my %answersToStore; 303 my %answerHash = %{ $pg->{answers} }; 304 $answersToStore{$_} = $answerHash{$_}->{original_student_ans} 305 foreach (keys %answerHash); 306 my $answerString = encodeAnswers(%answersToStore, 307 @{ $pg->{flags}->{ANSWER_ENTRY_ORDER} }); 308 $pureProblem->last_answer($answerString); 309 $problem->last_answer($answerString); 310 $db->putUserProblem($pureProblem); 311 312 # store state in DB if it makes sense 313 if ($will{recordAnswers}) { 314 $problem->status($pg->{state}->{recorded_score}); 315 $problem->attempted(1); 316 $problem->num_correct($pg->{state}->{num_of_correct_ans}); 317 $problem->num_incorrect($pg->{state}->{num_of_incorrect_ans}); 318 $pureProblem->status($pg->{state}->{recorded_score}); 319 $pureProblem->attempted(1); 320 $pureProblem->num_correct($pg->{state}->{num_of_correct_ans}); 321 $pureProblem->num_incorrect($pg->{state}->{num_of_incorrect_ans}); 322 $db->putUserProblem($pureProblem); 323 # write to the transaction log, just to make sure 324 writeLog($self->{ce}, "transaction", 325 $problem->problem_id."\t". 326 $problem->set_id."\t". 327 $problem->user_id."\t". 328 $problem->source_file."\t". 329 $problem->value."\t". 330 $problem->max_attempts."\t". 331 $problem->problem_seed."\t". 332 $pureProblem->status."\t". 333 $pureProblem->attempted."\t". 334 $pureProblem->last_answer."\t". 335 $pureProblem->num_correct."\t". 336 $pureProblem->num_incorrect 337 ); 338 } 339 } 340 # logging student answers 341 my $pastAnswerLog = undef; 342 if (defined( $self->{ce}->{webworkFiles}->{logs}->{'pastAnswerList'} )) { 343 344 $pastAnswerLog = $self->{ce}->{webworkFiles}->{logs}->{'pastAnswerList'}; 345 346 if ($submitAnswers and defined($pastAnswerLog) ) { 347 my $answerString = ""; 348 my %answerHash = %{ $pg->{answers} }; 349 $answerString = $answerString . $answerHash{$_}->{original_student_ans}."\t" 350 foreach (sort keys %answerHash); 351 writeLog($self->{ce}, "pastAnswerList", 352 '|'.$problem->user_id. 353 '|'.$problem->set_id. 354 '|'.$problem->problem_id.'|'."\t". 355 time()."\t". 356 $answerString, 357 358 ); 359 360 } 361 362 } 363 # end logging student answers 364 365 ##### output ##### 366 print CGI::start_div({class=>"problemHeader"}); 367 # attempt summary 368 if ($submitAnswers or $will{showCorrectAnswers}) { 369 # print this if user submitted answers OR requested correct answers 370 print $self->attemptResults($pg, $submitAnswers, 371 $will{showCorrectAnswers}, 372 $pg->{flags}->{showPartialCorrectAnswers}, 1, 0); 373 } elsif ($checkAnswers) { 374 # print this if user previewed answers 375 print $self->attemptResults($pg, 1, 0, 1, 1, 0); 376 # show attempt answers 377 # don't show correct answers 378 # show attempt results (correctness) 379 # don't show attempt previews 380 } elsif ($previewAnswers) { 381 # print this if user previewed answers 382 print $self->attemptResults($pg, 1, 0, 0, 0, 1); 383 # show attempt answers 384 # don't show correct answers 385 # don't show attempt results (correctness) 386 # show attempt previews 387 } 388 389 print CGI::end_div(); 390 391 print CGI::start_div({class=>"problem"}); 392 #print CGI::hr(); 393 # main form 394 print 395 CGI::startform("POST", $r->uri), 396 $self->hidden_authen_fields, 397 CGI::p($pg->{body_text}), 398 CGI::p($pg->{result}->{msg} ? CGI::b("Note: ") : "", CGI::i($pg->{result}->{msg})), 399 CGI::p( 400 ($can{recordAnswers} 401 ? CGI::submit(-name=>"submitAnswers", 402 -label=>"Submit Answers") 403 : ""), 404 ($can{checkAnswers} 405 ? CGI::submit(-name=>"checkAnswers", 406 -label=>"Check Answers") 407 : ""), 408 CGI::submit(-name=>"previewAnswers", 409 -label=>"Preview Answers"), 410 ); 411 print CGI::end_div(); 412 413 print CGI::start_div({class=>"scoreSummary"}); 414 # score summary 415 my $attempts = $problem->num_correct + $problem->num_incorrect; 416 my $attemptsNoun = $attempts != 1 ? "times" : "time"; 417 my $lastScore = int ($problem->status * 100) . "%"; 418 my ($attemptsLeft, $attemptsLeftNoun); 419 if ($problem->max_attempts == -1) { 420 # unlimited attempts 421 $attemptsLeft = "unlimited"; 422 $attemptsLeftNoun = "attempts"; 423 } else { 424 $attemptsLeft = $problem->max_attempts - $attempts; 425 $attemptsLeftNoun = $attemptsLeft == 1 ? "attempt" : "attempts"; 426 } 427 428 my $setClosed = 0; 429 my $setClosedMessage; 430 if (time < $set->open_date or time > $set->due_date) { 431 $setClosed = 1; 432 $setClosedMessage = "This problem set is closed."; 433 if ($permissionLevel > 0) { 434 $setClosedMessage .= " Since you are a privileged user, additional attempts will be recorded."; 435 } else { 436 $setClosedMessage .= " Additional attempts will not be recorded."; 437 } 438 } 439 print CGI::p( 440 "You have attempted this problem $attempts $attemptsNoun.", CGI::br(), 441 $problem->attempted 442 ? "Your recorded score is $lastScore." . CGI::br() 443 : "", 444 $setClosed ? $setClosedMessage : "You have $attemptsLeft $attemptsLeftNoun remaining." 445 ); 446 print CGI::end_div(); 447 print CGI::hr(), CGI::start_div({class=>"viewOptions"}); 448 print 449 $self->viewOptions(),CGI::end_div(), 450 CGI::endform(); 451 452 print CGI::start_div({class=>"problemFooter"}); 453 # feedback form 454 my $ce = $self->{ce}; 455 my $root = $ce->{webworkURLs}->{root}; 456 my $courseName = $ce->{courseName}; 457 my $feedbackURL = "$root/$courseName/feedback/"; 458 459 # arguments for answer inspection button 460 my $prof_url = $ce->{webworkURLs}->{oldProf}; 461 my $cgi_url = $prof_url; 462 $cgi_url=~ s|/[^/]*$||; # clip profLogin.pl 463 my $authen_args = $self->url_authen_args(); 464 my $showPastAnswersURL = "$cgi_url/showPastAnswers.pl"; 465 466 #print feedback form 467 print 468 CGI::start_form(-method=>"POST", -action=>$feedbackURL),"\n", 469 $self->hidden_authen_fields,"\n", 470 CGI::hidden("module", __PACKAGE__),"\n", 471 CGI::hidden("set", $set->set_id),"\n", 472 CGI::hidden("problem", $problem->problem_id),"\n", 473 CGI::hidden("displayMode", $self->{displayMode}),"\n", 474 CGI::hidden("showOldAnswers", $will{showOldAnswers}),"\n", 475 CGI::hidden("showCorrectAnswers", $will{showCorrectAnswers}),"\n", 476 CGI::hidden("showHints", $will{showHints}),"\n", 477 CGI::hidden("showSolutions", $will{showSolutions}),"\n", 478 CGI::p({-align=>"right"}, 479 CGI::submit(-name=>"feedbackForm", -label=>"Send Feedback") 480 ), 481 CGI::endform(),"\n"; 482 # print answer inspection button 483 if ($self->{permissionLevel} >0) { 484 485 486 print "\n", 487 CGI::start_form(-method=>"POST",-action=>$showPastAnswersURL,-target=>"information"),"\n", 488 $self->hidden_authen_fields,"\n", 489 CGI::hidden(-name => 'course', -value=>$courseName), "\n", 490 CGI::hidden(-name => 'probNum', -value=>$problem->problem_id), "\n", 491 CGI::hidden(-name => 'setNum', -value=>$problem->set_id), "\n", 492 CGI::hidden(-name => 'User', -value=>$problem->user_id), "\n", 493 CGI::submit(-name => 'action', -value=>'Show Past Answers'), "\n", 494 CGI::endform(); 495 496 497 498 } 499 # FIXME print editor link 500 if ($self->{permissionLevel}>=10 ) { 501 print CGI::a({-href=>"/webwork/$courseName/instructor/pgProblemEditor/".$set->set_id. 502 '/'.$problem->problem_id.'?'.$self->url_authen_args},'Edit this problem'); 503 } 504 print CGI::end_div(); 505 506 # end answer inspection button 507 # warning output 508 if ($pg->{warnings} ne "") { 509 print CGI::hr(), $self->warningOutput($pg->{warnings}); 510 } 511 512 # debugging stuff 513 if (0) { 514 print 515 CGI::hr(), 516 CGI::h2("debugging information"), 517 CGI::h3("form fields"), 518 ref2string($self->{formFields}), 519 CGI::h3("user object"), 520 ref2string($self->{user}), 521 CGI::h3("set object"), 522 ref2string($set), 523 CGI::h3("problem object"), 524 ref2string($problem), 525 CGI::h3("PG object"), 526 ref2string($pg, {'WeBWorK::PG::Translator' => 1}); 527 } 528 529 return ""; 530 } 531 532 ##### output utilities ##### 533 534 sub attemptResults($$$$$$) { 535 my $self = shift; 536 my $pg = shift; 537 my $showAttemptAnswers = shift; 538 my $showCorrectAnswers = shift; 539 my $showAttemptResults = $showAttemptAnswers && shift; 540 my $showSummary = shift; 541 my $showAttemptPreview = shift || 0; 542 my $problemResult = $pg->{result}; # the overall result of the problem 543 my @answerNames = @{ $pg->{flags}->{ANSWER_ENTRY_ORDER} }; 544 545 my $showMessages = $showAttemptAnswers && grep { $pg->{answers}->{$_}->{ans_message} } @answerNames; 546 547 my $header = CGI::th("Part"); 548 $header .= $showAttemptAnswers ? CGI::th("Entered") : ""; 549 $header .= $showAttemptPreview ? CGI::th("Answer Preview") : ""; 550 $header .= $showCorrectAnswers ? CGI::th("Correct") : ""; 551 $header .= $showAttemptResults ? CGI::th("Result") : ""; 552 $header .= $showMessages ? CGI::th("messages") : ""; 553 my @tableRows = ( $header ); 554 my $numCorrect; 555 foreach my $name (@answerNames) { 556 my $answerResult = $pg->{answers}->{$name}; 557 my $studentAnswer = $answerResult->{student_ans}; # original_student_ans 558 my $preview = ($showAttemptPreview 559 ? $self->previewAnswer($answerResult) 560 : ""); 561 my $correctAnswer = $answerResult->{correct_ans}; 562 my $answerScore = $answerResult->{score}; 563 my $answerMessage = $showMessages ? $answerResult->{ans_message} : ""; 564 565 $numCorrect += $answerScore > 0; 566 my $resultString = $answerScore ? "correct" : "incorrect"; 567 568 # get rid of the goofy prefix on the answer names (supposedly, the format 569 # of the answer names is changeable. this only fixes it for "AnSwEr" 570 $name =~ s/^AnSwEr//; 571 572 my $row = CGI::td($name); 573 $row .= $showAttemptAnswers ? CGI::td($studentAnswer) : ""; 574 $row .= $showAttemptPreview ? CGI::td($preview) : ""; 575 $row .= $showCorrectAnswers ? CGI::td($correctAnswer) : ""; 576 $row .= $showAttemptResults ? CGI::td($resultString) : ""; 577 $row .= $answerMessage ? CGI::td($answerMessage) : ""; 578 push @tableRows, $row; 579 } 580 581 my $numIncorrectNoun = scalar @answerNames == 1 ? "question" : "questions"; 582 my $scorePercent = int ($problemResult->{score} * 100) . "\%"; 583 my $summary = "On this attempt, you answered $numCorrect out of " 584 . scalar @answerNames . " $numIncorrectNoun correct, for a score of $scorePercent."; 585 return CGI::table({-class=>"attemptResults"}, CGI::Tr(\@tableRows)) . ($showSummary ? CGI::p($summary) : ""); 586 } 587 588 sub viewOptions($) { 589 my $self = shift; 590 my $displayMode = $self->{displayMode}; 591 my %must = %{ $self->{must} }; 592 my %can = %{ $self->{can} }; 593 my %will = %{ $self->{will} }; 594 595 my $optionLine; 596 $can{showOldAnswers} and $optionLine .= join "", 597 "Show: ", 598 CGI::checkbox( 599 -name => "showOldAnswers", 600 -checked => $will{showOldAnswers}, 601 -label => "Saved answers", 602 ), " "; 603 $can{showCorrectAnswers} and $optionLine .= join "", 604 CGI::checkbox( 605 -name => "showCorrectAnswers", 606 -checked => $will{showCorrectAnswers}, 607 -label => "Correct answers", 608 ), " "; 609 $can{showHints} and $optionLine .= join "", 610 CGI::checkbox( 611 -name => "showHints", 612 -checked => $will{showHints}, 613 -label => "Hints", 614 ), " "; 615 $can{showSolutions} and $optionLine .= join "", 616 CGI::checkbox( 617 -name => "showSolutions", 618 -checked => $will{showSolutions}, 619 -label => "Solutions", 620 ), " "; 621 $optionLine and $optionLine .= join "", CGI::br(); 622 623 return CGI::div({-style=>"border: thin groove; padding: 1ex; margin: 2ex"}, 624 "View equations as: ", 625 CGI::radio_group( 626 -name => "displayMode", 627 -values => ['plainText', 'formattedText', 'images'], 628 -default => $displayMode, 629 -labels => { 630 plainText => "plain text", 631 formattedText => "formatted text", 632 images => "images", 633 } 634 ), CGI::br(), 635 $optionLine, 636 CGI::submit(-name=>"redisplay", -label=>"Redisplay Problem"), 637 ); 638 } 639 640 sub previewAnswer($$) { 641 my ($self, $answerResult) = @_; 642 my $ce = $self->{ce}; 643 my $effectiveUser = $self->{effectiveUser}; 644 my $set = $self->{set}; 645 my $problem = $self->{problem}; 646 my $displayMode = $self->{displayMode}; 647 648 # note: right now, we have to do things completely differently when we are 649 # rendering math from INSIDE the translator and from OUTSIDE the translator. 650 # so we'll just deal with each case explicitly here. there's some code 651 # duplication that can be dealt with later by abstracting out tth/dvipng/etc. 652 653 my $tex = $answerResult->{preview_latex_string}; 654 655 return "" if $tex eq ""; 656 657 if ($displayMode eq "plainText") { 658 return $tex; 659 } elsif ($displayMode eq "formattedText") { 660 my $tthCommand = $ce->{externalPrograms}->{tth} 661 . " -L -f5 -r 2> /dev/null <<END_OF_INPUT; echo > /dev/null\n" 662 . "\\(".$tex."\\)\n" 663 . "END_OF_INPUT\n"; 664 665 # call tth 666 my $result = `$tthCommand`; 667 if ($?) { 668 return "<b>[tth failed: $? $@]</b>"; 669 } 670 return $result; 671 } elsif ($displayMode eq "images") { 672 # how are we going to name this? 673 my $targetPathCommon = "/png/" 674 . $effectiveUser->user_id . "." 675 . $set->set_id . "." 676 . $problem->problem_id . "." 677 . $answerResult->{ans_name} . ".png"; 678 679 # figure out where to put things 680 my $wd = tempdir("webwork-dvipng-XXXXXXXX", DIR => $ce->{courseDirs}->{html_temp}); 681 my $latex = $ce->{externalPrograms}->{latex}; 682 my $dvipng = $ce->{externalPrograms}->{dvipng}; 683 my $targetPath = $ce->{courseDirs}->{html_temp} . $targetPathCommon; 684 # should use surePathToTmpFile, but we have to 685 # isolate it from the problem enivronment first 686 my $targetURL = $ce->{courseURLs}->{html_temp} . $targetPathCommon; 687 688 # call dvipng to generate a preview 689 dvipng($wd, $latex, $dvipng, $tex, $targetPath); 690 rmtree($envir->{dvipngTempDir}, 0, 0); 691 if (-e $targetPath) { 692 return "<img src=\"$targetURL\" alt=\"$tex\" />"; 693 } else { 694 return "<b>[math2img failed]</b>"; 695 } 696 } 697 } 698 ##### logging subroutine #### 699 700 701 702 ##### permission queries ##### 703 704 # this stuff should be abstracted out into the permissions system 705 # however, the permission system only knows about things in the 706 # course environment and the username. hmmm... 707 708 # also, i should fix these so that they have a consistent calling 709 # format -- perhaps: 710 # canPERM($courseEnv, $user, $set, $problem, $permissionLevel) 711 712 sub canShowCorrectAnswers($$) { 713 my ($permissionLevel, $answerDate) = @_; 714 return $permissionLevel > 0 || time > $answerDate; 715 } 716 717 sub canShowSolutions($$) { 718 my ($permissionLevel, $answerDate) = @_; 719 return canShowCorrectAnswers($permissionLevel, $answerDate); 720 } 721 722 sub canRecordAnswers($$$$$) { 723 my ($permissionLevel, $openDate, $dueDate, $maxAttempts, $attempts) = @_; 724 my $permHigh = $permissionLevel > 0; 725 my $timeOK = time >= $openDate && time <= $dueDate; 726 my $attemptsOK = $maxAttempts == -1 || $attempts <= $maxAttempts; 727 my $recordAnswers = $permHigh || ($timeOK && $attemptsOK); 728 return $recordAnswers; 729 } 730 731 sub canCheckAnswers($$) { 732 my ($permissionLevel, $answerDate) = @_; 733 my $permHigh = $permissionLevel > 0; 734 my $timeOK = time >= $answerDate; 735 my $recordAnswers = $permHigh || $timeOK; 736 return $recordAnswers; 737 } 738 739 sub mustRecordAnswers($) { 740 my ($permissionLevel) = @_; 741 return $permissionLevel == 0; 742 } 743 744 1;
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