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