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Check for empty string instead of truth when inserting in answer table. This fixes bug #86 --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 my $timer0_ON=1; # times pg translation phase 15 use strict; 16 use warnings; 17 use CGI qw(); 18 use File::Path qw(rmtree); 19 use WeBWorK::Form; 20 use WeBWorK::PG; 21 use WeBWorK::PG::ImageGenerator; 22 use WeBWorK::PG::IO; 23 use WeBWorK::Utils qw(writeLog encodeAnswers decodeAnswers ref2string makeTempDirectory); 24 use WeBWorK::DB::Utils qw(global2user user2global findDefaults); 25 use WeBWorK::Timing; 26 27 ############################################################ 28 # 29 # user 30 # effectiveUser 31 # key 32 # 33 # displayMode 34 # showOldAnswers 35 # showCorrectAnswers 36 # showHints 37 # showSolutions 38 # 39 # AnSwEr# - answer blanks in problem 40 # 41 # redisplay - name of the "Redisplay Problem" button 42 # submitAnswers - name of "Submit Answers" button 43 # checkAnswers - name of the "Check Answers" button 44 # previewAnswers - name of the "Preview Answers" button 45 # 46 ############################################################ 47 48 sub pre_header_initialize { 49 my ($self, $setName, $problemNumber) = @_; 50 my $r = $self->{r}; 51 my $courseEnv = $self->{ce}; 52 my $db = $self->{db}; 53 my $userName = $r->param('user'); 54 my $effectiveUserName = $r->param('effectiveUser'); 55 my $key = $r->param('key'); 56 my $user = $db->getUser($userName); 57 my $effectiveUser = $db->getUser($effectiveUserName); 58 my $permissionLevel = $db->getPermissionLevel($userName)->permission(); 59 60 # obtain the merged set for $effectiveUser 61 my $set = $db->getMergedSet($effectiveUserName, $setName); 62 63 # obtain the merged problem for $effectiveUser 64 my $problem = $db->getMergedProblem($effectiveUserName, $setName, $problemNumber); 65 66 my $editMode = $r->param("editMode"); 67 68 if ($permissionLevel > 0 and defined $editMode) { 69 # professors are allowed to fabricate sets and problems not 70 # assigned to them (or anyone). this allows them to use the 71 # editor to 72 73 # if that is not yet defined obtain the global set, convert 74 # it to a user set, and add fake user data 75 unless (defined $set) { 76 my $userSetClass = $db->{set_user}->{record}; 77 $set = global2user($userSetClass, 78 $db->getGlobalSet($setName)); 79 die "Set $setName does not exist" 80 unless defined $set; 81 $set->psvn(0); 82 } 83 84 # if that is not yet defined obtain the global problem, 85 # convert it to a user problem, and add fake user data 86 unless (defined $problem) { 87 my $userProblemClass = $db->{problem_user}->{record}; 88 $problem = global2user($userProblemClass, 89 $db->getGlobalProblem($setName,$problemNumber)); 90 die "Problem $problemNumber in set $setName does not exist" 91 unless defined $problem; 92 $problem->user_id($effectiveUserName); 93 $problem->problem_seed(0); 94 $problem->status(0); 95 $problem->attempted(0); 96 $problem->last_answer(""); 97 $problem->num_correct(0); 98 $problem->num_incorrect(0); 99 } 100 101 # now we're sure we have valid UserSet and UserProblem objects 102 # yay! 103 104 # now deal with possible editor overrides: 105 106 # if the caller is asking to override the source file, and 107 # editMode calls for a temporary file, do so 108 my $sourceFilePath = $r->param("sourceFilePath"); 109 if (defined $sourceFilePath and $editMode eq "temporaryFile") { 110 $problem->source_file($sourceFilePath); 111 } 112 113 # if the caller is asking to override the problem seed, do so 114 my $problemSeed = $r->param("problemSeed"); 115 if (defined $problemSeed) { 116 $problem->problem_seed($problemSeed); 117 } 118 } else { 119 # students can't view problems not assigned to them 120 die "Set $setName is not assigned to $effectiveUserName" 121 unless defined $set; 122 die "Problem $problemNumber in set $setName is not assigned to $effectiveUserName" 123 unless defined $problem; 124 } 125 126 $self->{userName} = $userName; 127 $self->{effectiveUserName} = $effectiveUserName; 128 $self->{user} = $user; 129 $self->{effectiveUser} = $effectiveUser; 130 $self->{permissionLevel} = $permissionLevel; 131 $self->{set} = $set; 132 $self->{problem} = $problem; 133 $self->{editMode} = $editMode; 134 135 ##### form processing ##### 136 137 # set options from form fields (see comment at top of file for names) 138 my $displayMode = $r->param("displayMode") || $courseEnv->{pg}->{options}->{displayMode}; 139 my $redisplay = $r->param("redisplay"); 140 my $submitAnswers = $r->param("submitAnswers"); 141 my $checkAnswers = $r->param("checkAnswers"); 142 my $previewAnswers = $r->param("previewAnswers"); 143 144 # fields which may be defined when using Problem Editor 145 #my $override_seed = ($permissionLevel>=10) ? $r->param('problemSeed') : undef; 146 #my $override_problem_source = ($permissionLevel>=10) ? $r->param('sourceFilePath') : undef; 147 #my $editMode = undef; 148 #my $submit_button = $r->param('submit_button'); 149 #if ( defined($submit_button ) ) { 150 # $editMode = "temporaryFile" if $submit_button eq 'Refresh'; 151 # $editMode = 'savedFile' if $submit_button eq 'Save'; 152 #} 153 # 154 ##override using the source file data from the form field 155 #$problem->source_file($override_problem_source) if defined($override_problem_source); 156 #$problem->problem_seed($override_seed) if defined($override_seed); 157 # 158 ## store path to source file for title. 159 #$self->{problem_source_name} = $problem->source_file; 160 #$self->{edit_mode} = $editMode; 161 #$self->{current_problem_source} = (defined($override_problem_source) ) ? 162 163 # coerce form fields into CGI::Vars format 164 my $formFields = { WeBWorK::Form->new_from_paramable($r)->Vars }; 165 166 $self->{displayMode} = $displayMode; 167 $self->{redisplay} = $redisplay; 168 $self->{submitAnswers} = $submitAnswers; 169 $self->{checkAnswers} = $checkAnswers; 170 $self->{previewAnswers} = $previewAnswers; 171 $self->{formFields} = $formFields; 172 173 ##### permissions ##### 174 175 # are we allowed to view this problem? 176 $self->{isOpen} = time >= $set->open_date || $permissionLevel > 0; 177 return unless $self->{isOpen}; 178 179 # what does the user want to do? 180 my %want = ( 181 showOldAnswers => $r->param("showOldAnswers") || $courseEnv->{pg}->{options}->{showOldAnswers}, 182 showCorrectAnswers => $r->param("showCorrectAnswers") || $courseEnv->{pg}->{options}->{showCorrectAnswers}, 183 showHints => $r->param("showHints") || $courseEnv->{pg}->{options}->{showHints}, 184 showSolutions => $r->param("showSolutions") || $courseEnv->{pg}->{options}->{showSolutions}, 185 recordAnswers => $submitAnswers, 186 checkAnswers => $checkAnswers, 187 ); 188 189 # are certain options enforced? 190 my %must = ( 191 showOldAnswers => 0, 192 showCorrectAnswers => 0, 193 showHints => 0, 194 showSolutions => 0, 195 recordAnswers => mustRecordAnswers($permissionLevel), 196 checkAnswers => 0, 197 ); 198 199 # does the user have permission to use certain options? 200 my %can = ( 201 showOldAnswers => 1, 202 showCorrectAnswers => canShowCorrectAnswers($permissionLevel, $set->answer_date), 203 showHints => 1, 204 showSolutions => canShowSolutions($permissionLevel, $set->answer_date), 205 recordAnswers => canRecordAnswers($permissionLevel, $set->open_date, $set->due_date, 206 $problem->max_attempts, $problem->num_correct + $problem->num_incorrect + 1), 207 # attempts=num_correct+num_incorrect+1, as this happens before updating $problem 208 checkAnswers => canCheckAnswers($permissionLevel, $set->answer_date), 209 ); 210 211 # final values for options 212 my %will; 213 foreach (keys %must) { 214 $will{$_} = $can{$_} && ($want{$_} || $must{$_}); 215 } 216 217 ##### sticky answers ##### 218 219 if (not ($submitAnswers or $previewAnswers or $checkAnswers) and $will{showOldAnswers}) { 220 # do this only if new answers are NOT being submitted 221 my %oldAnswers = decodeAnswers($problem->last_answer); 222 $formFields->{$_} = $oldAnswers{$_} foreach keys %oldAnswers; 223 } 224 225 ##### translation ##### 226 227 $WeBWorK::timer0->continue("begin pg processing") if $timer0_ON; 228 my $pg = WeBWorK::PG->new( 229 $courseEnv, 230 $effectiveUser, 231 $key, 232 $set, 233 $problem, 234 $set->psvn, # FIXME: this field should be removed 235 $formFields, 236 { # translation options 237 displayMode => $displayMode, 238 showHints => $will{showHints}, 239 showSolutions => $will{showSolutions}, 240 refreshMath2img => $will{showHints} || $will{showSolutions}, 241 processAnswers => 1, 242 }, 243 ); 244 245 $WeBWorK::timer0->continue("end pg processing") if $timer0_ON; 246 ##### fix hint/solution options ##### 247 248 $can{showHints} &&= $pg->{flags}->{hintExists}; 249 $can{showSolutions} &&= $pg->{flags}->{solutionExists}; 250 251 ##### store fields ##### 252 253 $self->{want} = \%want; 254 $self->{must} = \%must; 255 $self->{can} = \%can; 256 $self->{will} = \%will; 257 258 $self->{pg} = $pg; 259 } 260 261 #sub if_warnings($$) { 262 # my ($self, $arg) = @_; 263 # return 0 unless $self->{isOpen}; 264 # return $self->{pg}->{warnings} ne ""; 265 #} 266 267 sub if_errors($$) { 268 my ($self, $arg) = @_; 269 return 0 unless $self->{isOpen}; 270 return $self->{pg}->{flags}->{error_flag}; 271 } 272 273 sub head { 274 my $self = shift; 275 return "" unless $self->{isOpen}; 276 return $self->{pg}->{head_text} if $self->{pg}->{head_text}; 277 } 278 279 sub options { 280 my $self = shift; 281 return join("", 282 CGI::start_form("POST", $self->{r}->uri), 283 $self->hidden_authen_fields, 284 CGI::hr(), 285 CGI::start_div({class=>"viewOptions"}), 286 $self->viewOptions(), 287 CGI::end_div(), 288 CGI::end_form() 289 ); 290 } 291 292 sub path { 293 my $self = shift; 294 my $args = $_[-1]; 295 my $setName = $self->{set}->set_id; 296 my $problemNumber = $self->{problem}->problem_id; 297 298 my $ce = $self->{ce}; 299 my $root = $ce->{webworkURLs}->{root}; 300 my $courseName = $ce->{courseName}; 301 return $self->pathMacro($args, 302 "Home" => "$root", 303 $courseName => "$root/$courseName", 304 $setName => "$root/$courseName/$setName", 305 "Problem $problemNumber" => "", 306 ); 307 } 308 309 sub siblings { 310 my $self = shift; 311 my $setName = $self->{set}->set_id; 312 my $problemNumber = $self->{problem}->problem_id; 313 314 my $ce = $self->{ce}; 315 my $db = $self->{db}; 316 my $root = $ce->{webworkURLs}->{root}; 317 my $courseName = $ce->{courseName}; 318 print CGI::strong("Problems"), CGI::br(); 319 320 my $effectiveUser = $self->{r}->param("effectiveUser"); 321 my @problemIDs = $db->listUserProblems($effectiveUser, $setName); 322 foreach my $problem (sort { $a <=> $b } @problemIDs) { 323 print CGI::a({-href=>"$root/$courseName/$setName/".$problem."/?" 324 . $self->url_authen_args . "&displayMode=" . $self->{displayMode}}, 325 "Problem ".$problem), CGI::br(); 326 } 327 328 return ""; 329 } 330 331 sub nav { 332 $WeBWorK::timer0->continue("begin nav subroutine") if $timer0_ON; 333 my $self = shift; 334 my $args = $_[-1]; 335 my $setName = $self->{set}->set_id; 336 my $problemNumber = $self->{problem}->problem_id; 337 338 my $ce = $self->{ce}; 339 my $db = $self->{db}; 340 my $root = $ce->{webworkURLs}->{root}; 341 my $courseName = $ce->{courseName}; 342 343 my $wwdb = $self->{wwdb}; 344 my $effectiveUser = $self->{r}->param("effectiveUser"); 345 my $tail = "&displayMode=".$self->{displayMode}; 346 347 my @links = ("Problem List" , "$root/$courseName/$setName", "navProbList"); 348 349 my @problemIDs = $db->listUserProblems($effectiveUser, $setName); 350 my ($prevID, $nextID); 351 foreach my $id (@problemIDs) { 352 $prevID = $id if $id < $problemNumber 353 and (not defined $prevID or $id > $prevID); 354 $nextID = $id if $id > $problemNumber 355 and (not defined $nextID or $id < $nextID); 356 } 357 unshift @links, "Previous Problem" , ($prevID 358 ? "$root/$courseName/$setName/".$prevID 359 : "") , "navPrev"; 360 push @links, "Next Problem" , ($nextID 361 ? "$root/$courseName/$setName/".$nextID 362 : "") , "navNext"; 363 364 my $result = $self->navMacro($args, $tail, @links); 365 $WeBWorK::timer0->continue("end nav subroutine") if $timer0_ON; 366 return $result; 367 } 368 369 sub title { 370 my $self = shift; 371 my $setName = $self->{set}->set_id; 372 my $problemNumber = $self->{problem}->problem_id; 373 374 return "$setName : Problem $problemNumber"; 375 } 376 377 sub body { 378 my $self = shift; 379 380 return CGI::p(CGI::font({-color=>"red"}, "This problem is not available because the problem set that contains it is not yet open.")) 381 unless $self->{isOpen}; 382 383 # unpack some useful variables 384 my $r = $self->{r}; 385 my $db = $self->{db}; 386 my $set = $self->{set}; 387 my $problem = $self->{problem}; 388 my $editMode = $self->{editMode}; 389 my $permissionLevel = $self->{permissionLevel}; 390 my $submitAnswers = $self->{submitAnswers}; 391 my $checkAnswers = $self->{checkAnswers}; 392 my $previewAnswers = $self->{previewAnswers}; 393 my %want = %{ $self->{want} }; 394 my %can = %{ $self->{can} }; 395 my %must = %{ $self->{must} }; 396 my %will = %{ $self->{will} }; 397 my $pg = $self->{pg}; 398 399 ##### translation errors? ##### 400 401 if ($pg->{flags}->{error_flag}) { 402 return $self->errorOutput($pg->{errors}, $pg->{body_text}); 403 } 404 405 ##### answer processing ##### 406 $WeBWorK::timer0->continue("begin answer processing") if $timer0_ON; 407 # if answers were submitted: 408 my $scoreRecordedMessage; 409 if ($submitAnswers) { 410 # get a "pure" (unmerged) UserProblem to modify 411 # this will be undefined if the problem has not been assigned to this user 412 my $pureProblem = $db->getUserProblem($problem->user_id, $problem->set_id, $problem->problem_id); 413 if (defined $pureProblem) { 414 # store answers in DB for sticky answers 415 my %answersToStore; 416 my %answerHash = %{ $pg->{answers} }; 417 $answersToStore{$_} = $answerHash{$_}->{original_student_ans} 418 foreach (keys %answerHash); 419 my $answerString = encodeAnswers(%answersToStore, 420 @{ $pg->{flags}->{ANSWER_ENTRY_ORDER} }); 421 422 # store last answer to database 423 $problem->last_answer($answerString); 424 $pureProblem->last_answer($answerString); 425 $db->putUserProblem($pureProblem); 426 427 # store state in DB if it makes sense 428 if ($will{recordAnswers}) { 429 $problem->status($pg->{state}->{recorded_score}); 430 $problem->attempted(1); 431 $problem->num_correct($pg->{state}->{num_of_correct_ans}); 432 $problem->num_incorrect($pg->{state}->{num_of_incorrect_ans}); 433 $pureProblem->status($pg->{state}->{recorded_score}); 434 $pureProblem->attempted(1); 435 $pureProblem->num_correct($pg->{state}->{num_of_correct_ans}); 436 $pureProblem->num_incorrect($pg->{state}->{num_of_incorrect_ans}); 437 if ($db->putUserProblem($pureProblem)) { 438 $scoreRecordedMessage = "Your score was recorded."; 439 } else { 440 $scoreRecordedMessage = "Your score was not recorded because there was a failure in storing the problem record to the database."; 441 } 442 # write to the transaction log, just to make sure 443 writeLog($self->{ce}, "transaction", 444 $problem->problem_id."\t". 445 $problem->set_id."\t". 446 $problem->user_id."\t". 447 $problem->source_file."\t". 448 $problem->value."\t". 449 $problem->max_attempts."\t". 450 $problem->problem_seed."\t". 451 $pureProblem->status."\t". 452 $pureProblem->attempted."\t". 453 $pureProblem->last_answer."\t". 454 $pureProblem->num_correct."\t". 455 $pureProblem->num_incorrect 456 ); 457 } else { 458 if (time < $set->open_date or time > $set->due_date) { 459 $scoreRecordedMessage = "Your score was not recorded because this problem set is closed."; 460 } else { 461 $scoreRecordedMessage = "Your score was not recorded."; 462 } 463 } 464 } else { 465 $scoreRecordedMessage = "Your score was not recorded because this problem has not been built for you."; 466 } 467 } 468 469 # logging student answers 470 my $pastAnswerLog = undef; 471 if (defined( $self->{ce}->{webworkFiles}->{logs}->{'pastAnswerList'} )) { 472 $pastAnswerLog = $self->{ce}->{webworkFiles}->{logs}->{'pastAnswerList'}; 473 if ($submitAnswers and defined $pastAnswerLog) { 474 my $answerString = ""; 475 my %answerHash = %{ $pg->{answers} }; 476 $answerString = $answerString . $answerHash{$_}->{original_student_ans}."\t" 477 foreach (sort keys %answerHash); 478 $answerString = '' unless defined($answerString); # insure string is defined. 479 writeLog($self->{ce}, "pastAnswerList", 480 '|'.$problem->user_id. 481 '|'.$problem->set_id. 482 '|'.$problem->problem_id.'|'."\t". 483 time()."\t". 484 $answerString, 485 ); 486 } 487 } 488 489 $WeBWorK::timer0->continue("end answer processing") if $timer0_ON; 490 491 ##### output ##### 492 493 print CGI::start_div({class=>"problemHeader"}); 494 495 # custom message for editor 496 if ($permissionLevel >= 10 and defined $editMode) { 497 if ($editMode eq "temporaryFile") { 498 print CGI::p(CGI::i("Editing temporary file: ", $problem->source_file)); 499 } elsif ($editMode eq "savedFile") { 500 print CGI::p(CGI::i("Problem saved to: ", $problem->source_file)); 501 } 502 } 503 504 # attempt summary 505 if ($submitAnswers or $will{showCorrectAnswers}) { 506 # print this if user submitted answers OR requested correct answers 507 print $self->attemptResults($pg, $submitAnswers, 508 $will{showCorrectAnswers}, 509 $pg->{flags}->{showPartialCorrectAnswers}, 1, 1); 510 } elsif ($checkAnswers) { 511 # print this if user previewed answers 512 print $self->attemptResults($pg, 1, 0, 1, 1, 1); 513 # show attempt answers 514 # don't show correct answers 515 # show attempt results (correctness) 516 # don't show attempt previews 517 } elsif ($previewAnswers) { 518 # print this if user previewed answers 519 print $self->attemptResults($pg, 1, 0, 0, 0, 1); 520 # show attempt answers 521 # don't show correct answers 522 # don't show attempt results (correctness) 523 # show attempt previews 524 } 525 526 print CGI::end_div(); 527 528 print CGI::start_div({class=>"problem"}); 529 530 # main form 531 print 532 CGI::startform("POST", $r->uri), 533 $self->hidden_authen_fields, 534 CGI::p($pg->{body_text}), 535 CGI::p($pg->{result}->{msg} ? CGI::b("Note: ") : "", CGI::i($pg->{result}->{msg})), 536 CGI::p( 537 ($can{recordAnswers} 538 ? CGI::submit(-name=>"submitAnswers", 539 -label=>"Submit Answers") 540 : ""), 541 ($can{checkAnswers} 542 ? CGI::submit(-name=>"checkAnswers", 543 -label=>"Check Answers") 544 : ""), 545 CGI::submit(-name=>"previewAnswers", 546 -label=>"Preview Answers"), 547 ); 548 print CGI::end_div(); 549 550 print CGI::start_div({class=>"scoreSummary"}); 551 552 # score summary 553 my $attempts = $problem->num_correct + $problem->num_incorrect; 554 my $attemptsNoun = $attempts != 1 ? "times" : "time"; 555 my $lastScore = sprintf("%.0f%%", $problem->status * 100); # Round to whole number 556 my ($attemptsLeft, $attemptsLeftNoun); 557 if ($problem->max_attempts == -1) { 558 # unlimited attempts 559 $attemptsLeft = "unlimited"; 560 $attemptsLeftNoun = "attempts"; 561 } else { 562 $attemptsLeft = $problem->max_attempts - $attempts; 563 $attemptsLeftNoun = $attemptsLeft == 1 ? "attempt" : "attempts"; 564 } 565 566 my $setClosed = 0; 567 my $setClosedMessage; 568 if (time < $set->open_date or time > $set->due_date) { 569 $setClosed = 1; 570 $setClosedMessage = "This problem set is closed."; 571 if ($permissionLevel > 0) { 572 $setClosedMessage .= " However, since you are a privileged user, additional attempts will be recorded."; 573 } else { 574 $setClosedMessage .= " Additional attempts will not be recorded."; 575 } 576 } 577 print CGI::p( 578 $submitAnswers ? $scoreRecordedMessage . CGI::br() : "", 579 "You have attempted this problem $attempts $attemptsNoun.", CGI::br(), 580 $problem->attempted 581 ? "Your recorded score is $lastScore." . CGI::br() 582 : "", 583 $setClosed ? $setClosedMessage : "You have $attemptsLeft $attemptsLeftNoun remaining." 584 ); 585 print CGI::end_div(); 586 587 # save state for viewOptions 588 print CGI::hidden( 589 -name => "showOldAnswers", 590 -value => $will{showOldAnswers} 591 ), 592 CGI::hidden( 593 -name => "showCorrectAnswers", 594 -value => $will{showCorrectAnswers} 595 ), 596 CGI::hidden( 597 -name => "showHints", 598 -value => $will{showHints}), 599 CGI::hidden( 600 -name => "showSolutions", 601 -value => $will{showSolutions}, 602 ), 603 CGI::hidden( 604 -name => "displayMode", 605 -value => $self->{displayMode} 606 ); 607 608 # end of main form 609 print CGI::endform(); 610 611 # stuff we need below (pull these out at the beginning?) 612 my $ce = $self->{ce}; 613 my $root = $ce->{webworkURLs}->{root}; 614 my $courseName = $ce->{courseName}; 615 616 print CGI::start_div({class=>"problemFooter"}); 617 618 # arguments for answer inspection button 619 my $prof_url = $ce->{webworkURLs}->{oldProf}; 620 my $cgi_url = $prof_url; 621 $cgi_url=~ s|/[^/]*$||; # clip profLogin.pl 622 my $authen_args = $self->url_authen_args(); 623 my $showPastAnswersURL = "$cgi_url/showPastAnswers.pl"; 624 625 # print answer inspection button 626 if ($self->{permissionLevel} > 0) { 627 print "\n", 628 CGI::start_form(-method=>"POST",-action=>$showPastAnswersURL,-target=>"information"),"\n", 629 $self->hidden_authen_fields,"\n", 630 CGI::hidden(-name => 'course', -value=>$courseName), "\n", 631 CGI::hidden(-name => 'probNum', -value=>$problem->problem_id), "\n", 632 CGI::hidden(-name => 'setNum', -value=>$problem->set_id), "\n", 633 CGI::hidden(-name => 'User', -value=>$problem->user_id), "\n", 634 CGI::p( {-align=>"left"}, 635 CGI::submit(-name => 'action', -value=>'Show Past Answers') 636 ), "\n", 637 CGI::endform(); 638 } 639 640 #print CGI::end_div(); 641 # 642 #print CGI::start_div(); 643 644 # arguments for feedback form 645 my $feedbackURL = "$root/$courseName/feedback/"; 646 647 #print feedback form 648 print 649 CGI::start_form(-method=>"POST", -action=>$feedbackURL),"\n", 650 $self->hidden_authen_fields,"\n", 651 CGI::hidden("module", __PACKAGE__),"\n", 652 CGI::hidden("set", $set->set_id),"\n", 653 CGI::hidden("problem", $problem->problem_id),"\n", 654 CGI::hidden("displayMode", $self->{displayMode}),"\n", 655 CGI::hidden("showOldAnswers", $will{showOldAnswers}),"\n", 656 CGI::hidden("showCorrectAnswers", $will{showCorrectAnswers}),"\n", 657 CGI::hidden("showHints", $will{showHints}),"\n", 658 CGI::hidden("showSolutions", $will{showSolutions}),"\n", 659 CGI::p({-align=>"left"}, 660 CGI::submit(-name=>"feedbackForm", -label=>"Contact instructor") 661 ), 662 CGI::endform(),"\n"; 663 664 # FIXME print editor link 665 # print editor link if the user is an instructor AND the file is not in temporary editing mode 666 if ($self->{permissionLevel}>=10 and ( (not defined($self->{edit_mode})) or $self->{edit_mode} eq 'savedFile') ) { 667 print CGI::a({-href=>$ce->{webworkURLs}->{root}."/$courseName/instructor/pgProblemEditor/".$set->set_id. 668 '/'.$problem->problem_id.'?'.$self->url_authen_args},'Edit this problem'); 669 } 670 671 print CGI::end_div(); 672 673 # warning output 674 #if ($pg->{warnings} ne "") { 675 # print CGI::hr(), $self->warningOutput($pg->{warnings}); 676 #} 677 678 # debugging stuff 679 if (0) { 680 print 681 CGI::hr(), 682 CGI::h2("debugging information"), 683 CGI::h3("form fields"), 684 ref2string($self->{formFields}), 685 CGI::h3("user object"), 686 ref2string($self->{user}), 687 CGI::h3("set object"), 688 ref2string($set), 689 CGI::h3("problem object"), 690 ref2string($problem), 691 CGI::h3("PG object"), 692 ref2string($pg, {'WeBWorK::PG::Translator' => 1}); 693 } 694 695 return ""; 696 } 697 698 ##### output utilities ##### 699 700 sub attemptResults($$$$$$) { 701 my $self = shift; 702 my $pg = shift; 703 my $showAttemptAnswers = shift; 704 my $showCorrectAnswers = shift; 705 my $showAttemptResults = $showAttemptAnswers && shift; 706 my $showSummary = shift; 707 my $showAttemptPreview = shift || 0; 708 my $ce = $self->{ce}; 709 my $problemResult = $pg->{result}; # the overall result of the problem 710 my @answerNames = @{ $pg->{flags}->{ANSWER_ENTRY_ORDER} }; 711 712 my $showMessages = $showAttemptAnswers && grep { $pg->{answers}->{$_}->{ans_message} } @answerNames; 713 714 my $basename = "equation-" . $self->{set}->psvn. "." . $self->{problem}->problem_id . "-preview"; 715 my $imgGen = WeBWorK::PG::ImageGenerator->new( 716 tempDir => $ce->{webworkDirs}->{tmp}, 717 dir => $ce->{courseDirs}->{html_temp}, 718 url => $ce->{courseURLs}->{html_temp}, 719 basename => $basename, 720 latex => $ce->{externalPrograms}->{latex}, 721 dvipng => $ce->{externalPrograms}->{dvipng}, 722 ); 723 724 my $header; 725 #$header .= CGI::th("Part"); 726 $header .= $showAttemptAnswers ? CGI::th("Entered") : ""; 727 $header .= $showAttemptPreview ? CGI::th("Answer Preview") : ""; 728 $header .= $showCorrectAnswers ? CGI::th("Correct") : ""; 729 $header .= $showAttemptResults ? CGI::th("Result") : ""; 730 $header .= $showMessages ? CGI::th("messages") : ""; 731 my @tableRows = ( $header ); 732 my $numCorrect; 733 foreach my $name (@answerNames) { 734 my $answerResult = $pg->{answers}->{$name}; 735 my $studentAnswer = $answerResult->{student_ans}; # original_student_ans 736 my $preview = ($showAttemptPreview 737 ? $self->previewAnswer($answerResult, $imgGen) 738 : ""); 739 my $correctAnswer = $answerResult->{correct_ans}; 740 my $answerScore = $answerResult->{score}; 741 my $answerMessage = $showMessages ? $answerResult->{ans_message} : ""; 742 743 $numCorrect += $answerScore > 0; 744 my $resultString = $answerScore ? "correct" : "incorrect"; 745 746 # get rid of the goofy prefix on the answer names (supposedly, the format 747 # of the answer names is changeable. this only fixes it for "AnSwEr" 748 $name =~ s/^AnSwEr//; 749 750 my $row; 751 #$row .= CGI::td($name); 752 $row .= $showAttemptAnswers ? CGI::td(nbsp($studentAnswer)) : ""; 753 $row .= $showAttemptPreview ? CGI::td(nbsp($preview)) : ""; 754 $row .= $showCorrectAnswers ? CGI::td(nbsp($correctAnswer)) : ""; 755 $row .= $showAttemptResults ? CGI::td(nbsp($resultString)) : ""; 756 $row .= $answerMessage ? CGI::td(nbsp($answerMessage)) : ""; 757 push @tableRows, $row; 758 } 759 760 # render equation images 761 $imgGen->render(refresh => 1); 762 763 my $numIncorrectNoun = scalar @answerNames == 1 ? "question" : "questions"; 764 my $scorePercent = sprintf("%.0f%%", $problemResult->{score} * 100); 765 my $summary = "On this attempt, you answered $numCorrect out of " 766 . scalar @answerNames . " $numIncorrectNoun correct, for a score of $scorePercent."; 767 return CGI::table({-class=>"attemptResults"}, CGI::Tr(\@tableRows)) . ($showSummary ? CGI::p({class=>'emphasis'},$summary) : ""); 768 } 769 sub nbsp { 770 my $str = shift; 771 ($str eq '') ? ' ' : $str ; # returns non-breaking space for empty strings 772 } 773 sub viewOptions($) { 774 my $self = shift; 775 my $displayMode = $self->{displayMode}; 776 my %must = %{ $self->{must} }; 777 my %can = %{ $self->{can} }; 778 my %will = %{ $self->{will} }; 779 780 my $optionLine; 781 $can{showOldAnswers} and $optionLine .= join "", 782 "Show: ".CGI::br(), 783 CGI::checkbox( 784 -name => "showOldAnswers", 785 -checked => $will{showOldAnswers}, 786 -label => "Saved answers", 787 ), " ".CGI::br(); 788 $can{showCorrectAnswers} and $optionLine .= join "", 789 CGI::checkbox( 790 -name => "showCorrectAnswers", 791 -checked => $will{showCorrectAnswers}, 792 -label => "Correct answers", 793 ), " ".CGI::br(); 794 $can{showHints} and $optionLine .= join "", 795 CGI::checkbox( 796 -name => "showHints", 797 -checked => $will{showHints}, 798 -label => "Hints", 799 ), " ".CGI::br(); 800 $can{showSolutions} and $optionLine .= join "", 801 CGI::checkbox( 802 -name => "showSolutions", 803 -checked => $will{showSolutions}, 804 -label => "Solutions", 805 ), " ".CGI::br(); 806 $optionLine and $optionLine .= join "", CGI::br(); 807 808 return CGI::div({-style=>"border: thin groove; padding: 1ex; margin: 2ex align: left"}, 809 "View equations as: ".CGI::br(), 810 CGI::radio_group( 811 -name => "displayMode", 812 -values => ['plainText', 'formattedText', 'images'], 813 -default => $displayMode, 814 -linebreak=>'true', 815 -labels => { 816 plainText => "plain", 817 formattedText => "formatted", 818 images => "images", 819 } 820 ), CGI::br(),CGI::hr(), 821 $optionLine, 822 CGI::submit(-name=>"redisplay", -label=>"Save Options"), 823 ); 824 } 825 826 sub previewAnswer($$) { 827 my ($self, $answerResult, $imgGen) = @_; 828 my $ce = $self->{ce}; 829 my $effectiveUser = $self->{effectiveUser}; 830 my $set = $self->{set}; 831 my $problem = $self->{problem}; 832 my $displayMode = $self->{displayMode}; 833 834 # note: right now, we have to do things completely differently when we are 835 # rendering math from INSIDE the translator and from OUTSIDE the translator. 836 # so we'll just deal with each case explicitly here. there's some code 837 # duplication that can be dealt with later by abstracting out tth/dvipng/etc. 838 839 my $tex = $answerResult->{preview_latex_string}; 840 841 return "" unless defined $tex and $tex ne ""; 842 843 if ($displayMode eq "plainText") { 844 return $tex; 845 } elsif ($displayMode eq "formattedText") { 846 my $tthCommand = $ce->{externalPrograms}->{tth} 847 . " -L -f5 -r 2> /dev/null <<END_OF_INPUT; echo > /dev/null\n" 848 . "\\(".$tex."\\)\n" 849 . "END_OF_INPUT\n"; 850 851 # call tth 852 my $result = `$tthCommand`; 853 if ($?) { 854 return "<b>[tth failed: $? $@]</b>"; 855 } 856 return $result; 857 } elsif ($displayMode eq "images") { 858 ## how are we going to name this? 859 #my $targetPathCommon = "/m2i/" 860 # . $effectiveUser->user_id . "." 861 # . $set->set_id . "." 862 # . $problem->problem_id . "." 863 # . $answerResult->{ans_name} . ".png"; 864 # 865 ## figure out where to put things 866 #my $wd = makeTempDirectory($ce->{courseDirs}->{html_temp}, "webwork-dvipng"); 867 #my $latex = $ce->{externalPrograms}->{latex}; 868 #my $dvipng = $ce->{externalPrograms}->{dvipng}; 869 #my $targetPath = $ce->{courseDirs}->{html_temp} . $targetPathCommon; 870 # # should use surePathToTmpFile, but we have to 871 # # isolate it from the problem enivronment first 872 #my $targetURL = $ce->{courseURLs}->{html_temp} . $targetPathCommon; 873 # 874 ## call dvipng to generate a preview 875 #dvipng($wd, $latex, $dvipng, $tex, $targetPath); 876 #rmtree($wd, 0, 0); 877 #if (-e $targetPath) { 878 # return "<img src=\"$targetURL\" alt=\"$tex\" />"; 879 #} else { 880 # return "<b>[math2img failed]</b>"; 881 #} 882 $imgGen->add($answerResult->{preview_latex_string}); 883 884 } 885 } 886 887 ##### logging subroutine #### 888 889 890 891 ##### permission queries ##### 892 893 # this stuff should be abstracted out into the permissions system 894 # however, the permission system only knows about things in the 895 # course environment and the username. hmmm... 896 897 # also, i should fix these so that they have a consistent calling 898 # format -- perhaps: 899 # canPERM($courseEnv, $user, $set, $problem, $permissionLevel) 900 901 sub canShowCorrectAnswers($$) { 902 my ($permissionLevel, $answerDate) = @_; 903 return $permissionLevel > 0 || time > $answerDate; 904 } 905 906 sub canShowSolutions($$) { 907 my ($permissionLevel, $answerDate) = @_; 908 return canShowCorrectAnswers($permissionLevel, $answerDate); 909 } 910 911 sub canRecordAnswers($$$$$) { 912 my ($permissionLevel, $openDate, $dueDate, $maxAttempts, $attempts) = @_; 913 my $permHigh = $permissionLevel > 0; 914 my $timeOK = time >= $openDate && time <= $dueDate; 915 my $attemptsOK = $maxAttempts == -1 || $attempts <= $maxAttempts; 916 my $recordAnswers = $permHigh || ($timeOK && $attemptsOK); 917 return $recordAnswers; 918 } 919 920 sub canCheckAnswers($$) { 921 my ($permissionLevel, $answerDate) = @_; 922 my $permHigh = $permissionLevel > 0; 923 my $timeOK = time >= $answerDate; 924 my $recordAnswers = $permHigh || $timeOK; 925 return $recordAnswers; 926 } 927 928 sub mustRecordAnswers($) { 929 my ($permissionLevel) = @_; 930 return $permissionLevel == 0; 931 } 932 933 1;
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