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1 ################################################################################ 2 # WeBWorK Online Homework Delivery System 3 # Copyright © 2000-2003 The WeBWorK Project, http://openwebwork.sf.net/ 4 # $CVSHeader: webwork-modperl/lib/WeBWorK/ContentGenerator/Problem.pm,v 1.150 2004/07/02 20:39:12 dpvc Exp $ 5 # 6 # This program is free software; you can redistribute it and/or modify it under 7 # the terms of either: (a) the GNU General Public License as published by the 8 # Free Software Foundation; either version 2, or (at your option) any later 9 # version, or (b) the "Artistic License" which comes with this package. 10 # 11 # This program is distributed in the hope that it will be useful, but WITHOUT 12 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 13 # FOR A PARTICULAR PURPOSE. See either the GNU General Public License or the 14 # Artistic License for more details. 15 ################################################################################ 16 17 package WeBWorK::ContentGenerator::Problem; 18 use base qw(WeBWorK::ContentGenerator); 19 20 =head1 NAME 21 22 WeBWorK::ContentGenerator::Problem - Allow a student to interact with a problem. 23 24 =cut 25 26 use strict; 27 use warnings; 28 use CGI qw(); 29 use File::Path qw(rmtree); 30 use WeBWorK::Form; 31 use WeBWorK::PG; 32 use WeBWorK::PG::ImageGenerator; 33 use WeBWorK::PG::IO; 34 use WeBWorK::Utils qw(writeLog writeCourseLog encodeAnswers decodeAnswers ref2string makeTempDirectory); 35 use WeBWorK::DB::Utils qw(global2user user2global findDefaults); 36 use WeBWorK::Timing; 37 38 use WeBWorK::Utils::Tasks qw(fake_set fake_problem); 39 40 ############################################################ 41 # 42 # user 43 # effectiveUser 44 # key 45 # 46 # editMode 47 # sourceFilePath - path to file to be editted 48 # problemSeed - problem seed for editted problem 49 # 50 # displayMode - type of display (ie formatted, images, asciimath, etc) 51 # 52 # showOldAnswers 53 # showCorrectAnswers 54 # showHints 55 # showSolutions 56 # 57 # AnSwEr# - answer blanks in problem 58 # 59 # redisplay - name of the "Redisplay Problem" button 60 # submitAnswers - name of "Submit Answers" button 61 # checkAnswers - name of the "Check Answers" button 62 # previewAnswers - name of the "Preview Answers" button 63 # 64 # success - success message (from PGProblemEditor) 65 # failure - failure message (from PGProblemEditor) 66 # 67 ############################################################ 68 69 70 sub pre_header_initialize { 71 my ($self) = @_; 72 my $r = $self->r; 73 my $ce = $r->ce; 74 my $db = $r->db; 75 my $authz = $r->authz; 76 my $urlpath = $r->urlpath; 77 78 my $setName = $urlpath->arg("setID"); 79 my $problemNumber = $r->urlpath->arg("problemID"); 80 my $userName = $r->param('user'); 81 my $effectiveUserName = $r->param('effectiveUser'); 82 my $key = $r->param('key'); 83 84 my $user = $db->getUser($userName); # checked 85 die "record for user $userName (real user) does not exist." 86 unless defined $user; 87 88 my $effectiveUser = $db->getUser($effectiveUserName); # checked 89 die "record for user $effectiveUserName (effective user) does not exist." 90 unless defined $effectiveUser; 91 92 my $PermissionLevel = $db->getPermissionLevel($userName); # checked 93 die "permission level record for user $userName does not exist (but the user does? odd...)" 94 unless defined $PermissionLevel; 95 my $permissionLevel = $PermissionLevel->permission; 96 97 # obtain the merged set for $effectiveUser 98 my $set = $db->getMergedSet($effectiveUserName, $setName); # checked 99 100 # obtain the merged problem for $effectiveUser 101 my $problem = $db->getMergedProblem($effectiveUserName, $setName, $problemNumber); # checked 102 103 my $editMode = $r->param("editMode"); 104 105 if ($authz->hasPermissions($userName, "modify_problem_sets")) { 106 # professors are allowed to fabricate sets and problems not 107 # assigned to them (or anyone). this allows them to use the 108 # editor to 109 110 # if that is not yet defined obtain the global set, convert 111 # it to a user set, and add fake user data 112 unless (defined $set) { 113 my $userSetClass = $db->{set_user}->{record}; 114 my $globalSet = $db->getGlobalSet($setName); # checked 115 # if the global set doesn't exist either, bail! 116 if(not defined $globalSet) { 117 $set = fake_set($db); 118 } else { 119 $set = global2user($userSetClass, $globalSet); 120 $set->psvn(0); 121 122 # FIXME: This is a temporary fix to fill in the database 123 # We want the published field to contain either 1 or 0 so if it has not been set to 0, default to 1 124 # this will fill in all the empty fields but not change anything that has been specifically set to 1 or 0 125 $globalSet->published("1") unless $globalSet->published eq "0"; 126 $db->putGlobalSet($globalSet); 127 } 128 } 129 130 # if that is not yet defined obtain the global problem, 131 # convert it to a user problem, and add fake user data 132 unless (defined $problem) { 133 my $userProblemClass = $db->{problem_user}->{record}; 134 my $globalProblem = $db->getGlobalProblem($setName, $problemNumber); # checked 135 # if the global problem doesn't exist either, bail! 136 if(not defined $globalProblem) { 137 my $sourceFilePath = $r->param("sourceFilePath"); 138 # These are problems from setmaker. If declared invalid, they won't come up 139 $self->{invalidProblem} = $self->{invalidSet} = 1 unless defined $sourceFilePath; 140 # die "Problem $problemNumber in set $setName does not exist" unless defined $sourceFilePath; 141 $problem = fake_problem($db); 142 $problem->problem_id(1); 143 $problem->source_file($sourceFilePath); 144 $problem->user_id($effectiveUserName); 145 } else { 146 $problem = global2user($userProblemClass, $globalProblem); 147 $problem->user_id($effectiveUserName); 148 $problem->problem_seed(0); 149 $problem->status(0); 150 $problem->attempted(0); 151 $problem->last_answer(""); 152 $problem->num_correct(0); 153 $problem->num_incorrect(0); 154 } 155 } 156 157 # now we're sure we have valid UserSet and UserProblem objects 158 # yay! 159 160 # now deal with possible editor overrides: 161 162 # if the caller is asking to override the source file, and 163 # editMode calls for a temporary file, do so 164 my $sourceFilePath = $r->param("sourceFilePath"); 165 if (defined $sourceFilePath and 166 (not defined $editMode or $editMode eq "temporaryFile")) { 167 $problem->source_file($sourceFilePath); 168 } 169 170 # if the problem does not have a source file or no source file has been passed in 171 # then this is really an invalid problem (probably from a bad URL) 172 $self->{invalidProblem} = not (defined $sourceFilePath or $problem->source_file); 173 174 # if the caller is asking to override the problem seed, do so 175 my $problemSeed = $r->param("problemSeed"); 176 if (defined $problemSeed) { 177 $problem->problem_seed($problemSeed); 178 } 179 180 my $publishedClass = ($set->published) ? "Published" : "Unpublished"; 181 my $publishedText = ($set->published) ? "visible to students." : "hidden from students."; 182 $self->addmessage(CGI::p("This set is " . CGI::font({class=>$publishedClass}, $publishedText))); 183 } else { 184 185 # students can't view problems not assigned to them 186 187 # A set is valid if it exists and if it is either published or the user is privileged. 188 $self->{invalidSet} = ((grep /^$setName/, $db->listUserSets($effectiveUserName)) == 0) 189 || not defined $set 190 || !($set->published || $authz->hasPermissions($userName, "view_unpublished_sets")); 191 $self->{invalidProblem} = ((grep /^$problemNumber/, $db->listUserProblems($effectiveUserName, $setName)) == 0) 192 || not defined $problem 193 || !($set->published || $authz->hasPermissions($userName, "view_unpublished_sets")); 194 195 $self->addbadmessage(CGI::p("This problem will not count towards your grade.")) if $problem and not $problem->value and not $self->{invalidProblem}; 196 } 197 198 $self->{userName} = $userName; 199 $self->{effectiveUserName} = $effectiveUserName; 200 $self->{user} = $user; 201 $self->{effectiveUser} = $effectiveUser; 202 $self->{permissionLevel} = $permissionLevel; 203 $self->{set} = $set; 204 $self->{problem} = $problem; 205 $self->{editMode} = $editMode; 206 207 ##### form processing ##### 208 209 # set options from form fields (see comment at top of file for names) 210 my $displayMode = $r->param("displayMode") || $ce->{pg}->{options}->{displayMode}; 211 my $redisplay = $r->param("redisplay"); 212 my $submitAnswers = $r->param("submitAnswers"); 213 my $checkAnswers = $r->param("checkAnswers"); 214 my $previewAnswers = $r->param("previewAnswers"); 215 216 my $formFields = { WeBWorK::Form->new_from_paramable($r)->Vars }; 217 218 $self->{displayMode} = $displayMode; 219 $self->{redisplay} = $redisplay; 220 $self->{submitAnswers} = $submitAnswers; 221 $self->{checkAnswers} = $checkAnswers; 222 $self->{previewAnswers} = $previewAnswers; 223 $self->{formFields} = $formFields; 224 225 # get result and send to message 226 my $success = $r->param("sucess"); 227 my $failure = $r->param("failure"); 228 $self->addbadmessage(CGI::p($failure)) if $failure; 229 $self->addgoodmessage(CGI::p($success)) if $success; 230 231 # now that we've set all the necessary variables quit out if the set or problem is invalid 232 return if $self->{invalidSet} || $self->{invalidProblem}; 233 234 ##### permissions ##### 235 236 # are we allowed to view this problem? 237 $self->{isOpen} = time >= $set->open_date || $authz->hasPermissions($user, "view_unopened_sets"); 238 return unless $self->{isOpen}; 239 240 # what does the user want to do? 241 my %want = ( 242 showOldAnswers => $r->param("showOldAnswers") || $ce->{pg}->{options}->{showOldAnswers}, 243 showCorrectAnswers => $r->param("showCorrectAnswers") || $ce->{pg}->{options}->{showCorrectAnswers}, 244 showHints => $r->param("showHints") || $ce->{pg}->{options}->{showHints}, 245 showSolutions => $r->param("showSolutions") || $ce->{pg}->{options}->{showSolutions}, 246 recordAnswers => $submitAnswers, 247 checkAnswers => $checkAnswers, 248 ); 249 250 # are certain options enforced? 251 my %must = ( 252 showOldAnswers => 0, 253 showCorrectAnswers => 0, 254 showHints => 0, 255 showSolutions => 0, 256 recordAnswers => mustRecordAnswers($permissionLevel), 257 checkAnswers => 0, 258 ); 259 260 # does the user have permission to use certain options? 261 my %can = ( 262 showOldAnswers => 1, 263 showCorrectAnswers => canShowCorrectAnswers($permissionLevel, $set->answer_date), 264 showHints => 1, 265 showSolutions => canShowSolutions($permissionLevel, $set->answer_date), 266 recordAnswers => canRecordAnswers($permissionLevel, $set->open_date, $set->due_date, 267 $problem->max_attempts, $problem->num_correct + $problem->num_incorrect + 1), 268 # attempts=num_correct+num_incorrect+1, as this happens before updating $problem 269 checkAnswers => canCheckAnswers($permissionLevel, $set->due_date), 270 ); 271 272 # more complicated logic for showing check answer button: 273 # checkAnswers button shows up after due date -- once a student can't record anymore 274 # checkAnswers button always shows up when an instructor or TA is acting 275 # as someone else (the $user and $effectiveUserName aren't the same). 276 $can{checkAnswers} = ( 277 # $can{recordAnswers} will be false if the due date has passed OR the 278 # student has used up all of her attempts 279 ($can{checkAnswers} and not $can{recordAnswers}) 280 or 281 ( 282 # FIXME: this is not the right way to check for this. 283 # also, canCheckAnswers() will show this button if the permission 284 # level is positive, which is always true when an instructor is 285 # acting as a student 286 defined($userName) 287 and 288 defined($effectiveUserName) 289 and 290 ($userName ne $effectiveUserName) 291 ) 292 ); 293 294 # more complicated logic for showing "submit answer" button: 295 # We hide the submit answer button if someone is acting as a student 296 # This prevents errors where you accidently submit the answer for a student 297 # Not sure whether this a feature or a bug 298 $can{recordAnswers} = ( 299 $can{recordAnswers} 300 and not 301 ( 302 # FIXME: this is not the right way to check for this. 303 defined($userName) 304 and 305 defined($effectiveUserName) 306 and 307 ($userName ne $effectiveUserName) 308 ) 309 ); 310 311 # final values for options 312 my %will; 313 foreach (keys %must) { 314 $will{$_} = $can{$_} && ($want{$_} || $must{$_}); 315 } 316 317 ##### sticky answers ##### 318 319 if (not ($submitAnswers or $previewAnswers or $checkAnswers) and $will{showOldAnswers}) { 320 # do this only if new answers are NOT being submitted 321 my %oldAnswers = decodeAnswers($problem->last_answer); 322 $formFields->{$_} = $oldAnswers{$_} foreach keys %oldAnswers; 323 } 324 325 ##### translation ##### 326 327 $WeBWorK::timer->continue("begin pg processing") if defined($WeBWorK::timer); 328 my $pg = WeBWorK::PG->new( 329 $ce, 330 $effectiveUser, 331 $key, 332 $set, 333 $problem, 334 $set->psvn, # FIXME: this field should be removed 335 $formFields, 336 { # translation options 337 displayMode => $displayMode, 338 showHints => $will{showHints}, 339 showSolutions => $will{showSolutions}, 340 refreshMath2img => $will{showHints} || $will{showSolutions}, 341 processAnswers => 1, 342 }, 343 ); 344 345 $WeBWorK::timer->continue("end pg processing") if defined($WeBWorK::timer); 346 ##### fix hint/solution options ##### 347 348 $can{showHints} &&= $pg->{flags}->{hintExists} 349 &&= $pg->{flags}->{showHintLimit}<=$pg->{state}->{num_of_incorrect_ans}; 350 $can{showSolutions} &&= $pg->{flags}->{solutionExists}; 351 352 ##### store fields ##### 353 354 $self->{want} = \%want; 355 $self->{must} = \%must; 356 $self->{can} = \%can; 357 $self->{will} = \%will; 358 $self->{pg} = $pg; 359 } 360 361 sub if_errors($$) { 362 my ($self, $arg) = @_; 363 364 if ($self->{isOpen}) { 365 return $self->{pg}->{flags}->{error_flag} ? $arg : !$arg; 366 } else { 367 return !$arg; 368 } 369 } 370 371 sub head { 372 my ($self) = @_; 373 374 return "" unless $self->{isOpen}; 375 return $self->{pg}->{head_text} if $self->{pg}->{head_text}; 376 } 377 378 sub options { 379 my ($self) = @_; 380 381 return "" if $self->{invalidProblem}; 382 my $sourceFilePathfield = ''; 383 if($self->r->param("sourceFilePath")) { 384 $sourceFilePathfield = CGI::hidden(-name => "sourceFilePath", 385 -value => $self->r->param("sourceFilePath")); 386 } 387 388 return join("", 389 CGI::start_form("POST", $self->{r}->uri), 390 $self->hidden_authen_fields, 391 $sourceFilePathfield, 392 CGI::hr(), 393 CGI::start_div({class=>"viewOptions"}), 394 $self->viewOptions(), 395 CGI::end_div(), 396 CGI::end_form() 397 ); 398 } 399 400 sub siblings { 401 my ($self) = @_; 402 my $r = $self->r; 403 my $db = $r->db; 404 my $urlpath = $r->urlpath; 405 406 # can't show sibling problems if the set is invalid 407 return "" if $self->{invalidSet}; 408 409 my $courseID = $urlpath->arg("courseID"); 410 my $setID = $self->{set}->set_id; 411 my $eUserID = $r->param("effectiveUser"); 412 my @problemIDs = sort { $a <=> $b } $db->listUserProblems($eUserID, $setID); 413 414 print CGI::start_ul({class=>"LinksMenu"}); 415 print CGI::start_li(); 416 print CGI::span({style=>"font-size:larger"}, "Problems"); 417 print CGI::start_ul(); 418 419 foreach my $problemID (@problemIDs) { 420 my $problemPage = $urlpath->newFromModule("WeBWorK::ContentGenerator::Problem", 421 courseID => $courseID, setID => $setID, problemID => $problemID); 422 print CGI::li(CGI::a({href=>$self->systemLink($problemPage, params=>{displayMode => $self->{displayMode}})}, "Problem $problemID")); 423 } 424 425 print CGI::end_ul(); 426 print CGI::end_li(); 427 print CGI::end_ul(); 428 429 return ""; 430 } 431 432 sub nav { 433 my ($self, $args) = @_; 434 my $r = $self->r; 435 my $db = $r->db; 436 my $urlpath = $r->urlpath; 437 438 my $courseID = $urlpath->arg("courseID"); 439 my $setID = $self->{set}->set_id if !($self->{invalidSet}); 440 my $problemID = $self->{problem}->problem_id if !($self->{invalidProblem}); 441 my $eUserID = $r->param("effectiveUser"); 442 443 my ($prevID, $nextID); 444 445 if (!$self->{invalidProblem}) { 446 my @problemIDs = $db->listUserProblems($eUserID, $setID); 447 foreach my $id (@problemIDs) { 448 $prevID = $id if $id < $problemID 449 and (not defined $prevID or $id > $prevID); 450 $nextID = $id if $id > $problemID 451 and (not defined $nextID or $id < $nextID); 452 } 453 } 454 455 my @links; 456 457 if ($prevID) { 458 my $prevPage = $urlpath->newFromModule(__PACKAGE__, 459 courseID => $courseID, setID => $setID, problemID => $prevID); 460 push @links, "Previous Problem", $r->location . $prevPage->path, "navPrev"; 461 } else { 462 push @links, "Previous Problem", "", "navPrev"; 463 } 464 465 push @links, "Problem List", $r->location . $urlpath->parent->path, "navProbList"; 466 467 if ($nextID) { 468 my $nextPage = $urlpath->newFromModule(__PACKAGE__, 469 courseID => $courseID, setID => $setID, problemID => $nextID); 470 push @links, "Next Problem", $r->location . $nextPage->path, "navNext"; 471 } else { 472 push @links, "Next Problem", "", "navNext"; 473 } 474 475 my $tail = "&displayMode=".$self->{displayMode}; 476 return $self->navMacro($args, $tail, @links); 477 } 478 479 sub title { 480 my ($self) = @_; 481 482 # using the url arguments won't break if the set/problem are invalid 483 my $setID = $self->r->urlpath->arg("setID"); 484 my $problemID = $self->r->urlpath->arg("problemID"); 485 486 return "$setID : $problemID"; 487 } 488 489 sub body { 490 my $self = shift; 491 my $r = $self->r; 492 my $ce = $r->ce; 493 my $db = $r->db; 494 my $authz = $r->authz; 495 my $urlpath = $r->urlpath; 496 my $user = $r->param('user'); 497 498 if ($self->{invalidSet}) { 499 return CGI::div({class=>"ResultsWithError"}, 500 CGI::p("The selected problem set (" . $urlpath->arg("setID") . ") is not a valid set for " . $r->param("effectiveUser") . ".")); 501 } 502 503 if ($self->{invalidProblem}) { 504 return CGI::div({class=>"ResultsWithError"}, 505 CGI::p("The selected problem (" . $urlpath->arg("problemID") . ") is not a valid problem for set " . $self->{set}->set_id . ".")); 506 } 507 508 unless ($self->{isOpen}) { 509 return CGI::div({class=>"ResultsWithError"}, 510 CGI::p("This problem is not available because the problem set that contains it is not yet open.")); 511 } 512 # unpack some useful variables 513 my $set = $self->{set}; 514 my $problem = $self->{problem}; 515 my $editMode = $self->{editMode}; 516 my $permissionLevel = $self->{permissionLevel}; 517 my $submitAnswers = $self->{submitAnswers}; 518 my $checkAnswers = $self->{checkAnswers}; 519 my $previewAnswers = $self->{previewAnswers}; 520 my %want = %{ $self->{want} }; 521 my %can = %{ $self->{can} }; 522 my %must = %{ $self->{must} }; 523 my %will = %{ $self->{will} }; 524 my $pg = $self->{pg}; 525 526 my $courseName = $urlpath->arg("courseID"); 527 528 my $editorLink = ""; 529 # if we are here without a real problem set, carry that through 530 my $forced_field = []; 531 $forced_field = ['sourceFilePath' => $r->param("sourceFilePath")] if 532 ($set->set_id eq 'Undefined_Set'); 533 if ($authz->hasPermissions($user, "modify_problem_sets")) { 534 my $editorPage = $urlpath->newFromModule("WeBWorK::ContentGenerator::Instructor::PGProblemEditor", 535 courseID => $courseName, setID => $set->set_id, problemID => $problem->problem_id); 536 my $editorURL = $self->systemLink($editorPage, params=>$forced_field); 537 $editorLink = CGI::a({href=>$editorURL}, "Edit this problem"); 538 } 539 540 ##### translation errors? ##### 541 542 if ($pg->{flags}->{error_flag}) { 543 print $self->errorOutput($pg->{errors}, $pg->{body_text}); 544 print $editorLink; 545 return ""; 546 } 547 548 ##### answer processing ##### 549 $WeBWorK::timer->continue("begin answer processing") if defined($WeBWorK::timer); 550 # if answers were submitted: 551 my $scoreRecordedMessage; 552 my $pureProblem; 553 if ($submitAnswers) { 554 # get a "pure" (unmerged) UserProblem to modify 555 # this will be undefined if the problem has not been assigned to this user 556 $pureProblem = $db->getUserProblem($problem->user_id, $problem->set_id, $problem->problem_id); # checked 557 if (defined $pureProblem) { 558 # store answers in DB for sticky answers 559 my %answersToStore; 560 my %answerHash = %{ $pg->{answers} }; 561 $answersToStore{$_} = $self->{formFields}->{$_} #$answerHash{$_}->{original_student_ans} -- this may have been modified for fields with multiple values. Don't use it!! 562 foreach (keys %answerHash); 563 564 # There may be some more answers to store -- one which are auxiliary entries to a primary answer. Evaluating 565 # matrices works in this way, only the first answer triggers an answer evaluator, the rest are just inputs 566 # however we need to store them. Fortunately they are still in the input form. 567 my @extra_answer_names = @{ $pg->{flags}->{KEPT_EXTRA_ANSWERS}}; 568 $answersToStore{$_} = $self->{formFields}->{$_} foreach (@extra_answer_names); 569 570 # Now let's encode these answers to store them -- append the extra answers to the end of answer entry order 571 my @answer_order = (@{$pg->{flags}->{ANSWER_ENTRY_ORDER}}, @extra_answer_names); 572 my $answerString = encodeAnswers(%answersToStore, 573 @answer_order); 574 575 # store last answer to database 576 $problem->last_answer($answerString); 577 $pureProblem->last_answer($answerString); 578 $db->putUserProblem($pureProblem); 579 580 # store state in DB if it makes sense 581 if ($will{recordAnswers}) { 582 $problem->status($pg->{state}->{recorded_score}); 583 $problem->attempted(1); 584 $problem->num_correct($pg->{state}->{num_of_correct_ans}); 585 $problem->num_incorrect($pg->{state}->{num_of_incorrect_ans}); 586 $pureProblem->status($pg->{state}->{recorded_score}); 587 $pureProblem->attempted(1); 588 $pureProblem->num_correct($pg->{state}->{num_of_correct_ans}); 589 $pureProblem->num_incorrect($pg->{state}->{num_of_incorrect_ans}); 590 if ($db->putUserProblem($pureProblem)) { 591 $scoreRecordedMessage = "Your score was recorded."; 592 } else { 593 $scoreRecordedMessage = "Your score was not recorded because there was a failure in storing the problem record to the database."; 594 } 595 # write to the transaction log, just to make sure 596 writeLog($self->{ce}, "transaction", 597 $problem->problem_id."\t". 598 $problem->set_id."\t". 599 $problem->user_id."\t". 600 $problem->source_file."\t". 601 $problem->value."\t". 602 $problem->max_attempts."\t". 603 $problem->problem_seed."\t". 604 $pureProblem->status."\t". 605 $pureProblem->attempted."\t". 606 $pureProblem->last_answer."\t". 607 $pureProblem->num_correct."\t". 608 $pureProblem->num_incorrect 609 ); 610 } else { 611 if (time < $set->open_date or time > $set->due_date) { 612 $scoreRecordedMessage = "Your score was not recorded because this problem set is closed."; 613 } else { 614 $scoreRecordedMessage = "Your score was not recorded."; 615 } 616 } 617 } else { 618 $scoreRecordedMessage = "Your score was not recorded because this problem has not been built for you."; 619 } 620 } 621 622 # logging student answers 623 624 my $answer_log = $self->{ce}->{courseFiles}->{logs}->{'answer_log'}; 625 if ( defined($answer_log ) and defined($pureProblem)) { 626 if ($submitAnswers ) { 627 my $answerString = ""; 628 my %answerHash = %{ $pg->{answers} }; 629 # FIXME this is the line 552 error. make sure original student ans is defined. 630 # The fact that it is not defined is probably due to an error in some answer evaluator. 631 # But I think it is useful to suppress this error message in the log. 632 foreach (sort keys %answerHash) { 633 my $student_ans = $answerHash{$_}->{original_student_ans} ||''; 634 $answerString .= $student_ans."\t" 635 } 636 $answerString = '' unless defined($answerString); # insure string is defined. 637 writeCourseLog($self->{ce}, "answer_log", 638 join("", 639 '|', $problem->user_id, 640 '|', $problem->set_id, 641 '|', $problem->problem_id, 642 '|',"\t", 643 time(),"\t", 644 $answerString, 645 ), 646 ); 647 648 } 649 } 650 651 $WeBWorK::timer->continue("end answer processing") if defined($WeBWorK::timer); 652 653 ##### output ##### 654 655 print CGI::start_div({class=>"problemHeader"}); 656 657 # custom message for editor 658 if ($authz->hasPermissions($user, "modify_problem_sets") and defined $editMode) { 659 if ($editMode eq "temporaryFile") { 660 print CGI::p(CGI::i("Editing temporary file: ", $problem->source_file)); 661 } elsif ($editMode eq "savedFile") { 662 # taken care of in the initialization phase 663 } 664 } 665 666 # attempt summary 667 #FIXME -- the following is a kludge: if showPartialCorrectAnswers is negative don't show anything. 668 # until after the due date 669 # do I need to check $will{showCorrectAnswers} to make preflight work?? 670 if (($pg->{flags}->{showPartialCorrectAnswers}>= 0 and $submitAnswers) ) { 671 # print this if user submitted answers OR requested correct answers 672 673 print $self->attemptResults($pg, 1, 674 $will{showCorrectAnswers}, 675 $pg->{flags}->{showPartialCorrectAnswers}, 1, 1); 676 } elsif ($checkAnswers) { 677 # print this if user previewed answers 678 print CGI::div({class=>'ResultsWithError'},"ANSWERS ONLY CHECKED -- ",CGI::br(),"ANSWERS NOT RECORDED", CGI::br() ); 679 print $self->attemptResults($pg, 1, $will{showCorrectAnswers}, 1, 1, 1); 680 # show attempt answers 681 # show correct answers if asked 682 # show attempt results (correctness) 683 # show attempt previews 684 } elsif ($previewAnswers) { 685 # print this if user previewed answers 686 print CGI::div({class=>'ResultsWithError'},"PREVIEW ONLY -- NOT RECORDED"),CGI::br(),$self->attemptResults($pg, 1, 0, 0, 0, 1); 687 # show attempt answers 688 # don't show correct answers 689 # don't show attempt results (correctness) 690 # show attempt previews 691 } 692 693 print CGI::end_div(); 694 695 print CGI::start_div({class=>"problem"}); 696 697 # main form 698 print 699 CGI::startform("POST", $r->uri), 700 $self->hidden_authen_fields, 701 CGI::p($pg->{body_text}), 702 CGI::p($pg->{result}->{msg} ? CGI::b("Note: ") : "", CGI::i($pg->{result}->{msg})), 703 CGI::p( 704 ($can{showCorrectAnswers} 705 ? CGI::checkbox( 706 -name => "showCorrectAnswers", 707 -checked => $will{showCorrectAnswers}, 708 -label => "Show correct answers", 709 ) ." " 710 : "" ), 711 ($can{showHints} 712 ? '<div style="color:red">'. CGI::checkbox( 713 -name => "showHints", 714 -checked => $will{showHints}, 715 -label => "Show Hints", 716 ) . "</div> " 717 : " " ), 718 ($can{showSolutions} 719 ? CGI::checkbox( 720 -name => "showSolutions", 721 -checked => $will{showSolutions}, 722 -label => "Show Solutions", 723 ) . " " 724 : " " ),CGI::br(), 725 CGI::submit(-name=>"previewAnswers", 726 -label=>"Preview Answers"), 727 ($can{recordAnswers} 728 ? CGI::submit(-name=>"submitAnswers", 729 -label=>"Submit Answers") 730 : ""), 731 ( $can{checkAnswers} 732 ? CGI::submit(-name=>"checkAnswers", 733 -label=>"Check Answers") 734 : ""), 735 ); 736 print CGI::end_div(); 737 738 print CGI::start_div({class=>"scoreSummary"}); 739 740 # score summary 741 my $attempts = $problem->num_correct + $problem->num_incorrect; 742 my $attemptsNoun = $attempts != 1 ? "times" : "time"; 743 my $lastScore = sprintf("%.0f%%", $problem->status * 100); # Round to whole number 744 my ($attemptsLeft, $attemptsLeftNoun); 745 if ($problem->max_attempts == -1) { 746 # unlimited attempts 747 $attemptsLeft = "unlimited"; 748 $attemptsLeftNoun = "attempts"; 749 } else { 750 $attemptsLeft = $problem->max_attempts - $attempts; 751 $attemptsLeftNoun = $attemptsLeft == 1 ? "attempt" : "attempts"; 752 } 753 754 my $setClosed = 0; 755 my $setClosedMessage; 756 if (time < $set->open_date or time > $set->due_date) { 757 $setClosed = 1; 758 $setClosedMessage = "This problem set is closed."; 759 if ($authz->hasPermissions($user, "view_answers")) { 760 $setClosedMessage .= " However, since you are a privileged user, additional attempts will be recorded."; 761 } else { 762 $setClosedMessage .= " Additional attempts will not be recorded."; 763 } 764 } 765 766 my $notCountedMessage = ($problem->value) ? "" : "(This problem will not count towards your grade.)"; 767 print CGI::p( 768 $submitAnswers ? $scoreRecordedMessage . CGI::br() : "", 769 "You have attempted this problem $attempts $attemptsNoun.", CGI::br(), 770 $problem->attempted 771 ? "Your recorded score is $lastScore. $notCountedMessage" . CGI::br() 772 : "", 773 $setClosed ? $setClosedMessage : "You have $attemptsLeft $attemptsLeftNoun remaining." 774 ); 775 print CGI::end_div(); 776 777 # save state for viewOptions 778 print CGI::hidden( 779 -name => "showOldAnswers", 780 -value => $will{showOldAnswers} 781 ), 782 783 CGI::hidden( 784 -name => "displayMode", 785 -value => $self->{displayMode} 786 ); 787 print( CGI::hidden( 788 -name => 'editMode', 789 -value => $self->{editMode}, 790 ) 791 ) if defined($self->{editMode}) and $self->{editMode} eq 'temporaryFile'; 792 print( CGI::hidden( 793 -name => 'sourceFilePath', 794 -value => $self->{problem}->{source_file} 795 )) if defined($self->{problem}->{source_file}); 796 797 print( CGI::hidden( 798 -name => 'problemSeed', 799 -value => $r->param("problemSeed") 800 )) if defined($r->param("problemSeed")); 801 802 # end of main form 803 print CGI::endform(); 804 805 print CGI::start_div({class=>"problemFooter"}); 806 807 ## arguments for answer inspection button 808 #my $prof_url = $ce->{webworkURLs}->{oldProf}; 809 #my $webworkURL = $ce->{webworkURLs}->{root}; 810 #my $cgi_url = $prof_url; 811 #$cgi_url=~ s|/[^/]*$||; # clip profLogin.pl 812 #my $authen_args = $self->url_authen_args(); 813 #my $showPastAnswersURL = "$webworkURL/$courseName/instructor/show_answers/"; 814 815 my $pastAnswersPage = $urlpath->newFromModule("WeBWorK::ContentGenerator::Instructor::ShowAnswers", 816 courseID => $courseName); 817 my $showPastAnswersURL = $self->systemLink($pastAnswersPage, authen => 0); # no authen info for form action 818 819 # print answer inspection button 820 if ($authz->hasPermissions($user, "view_answers")) { 821 print "\n", 822 CGI::start_form(-method=>"POST",-action=>$showPastAnswersURL,-target=>"information"),"\n", 823 $self->hidden_authen_fields,"\n", 824 CGI::hidden(-name => 'courseID', -value=>$courseName), "\n", 825 CGI::hidden(-name => 'problemID', -value=>$problem->problem_id), "\n", 826 CGI::hidden(-name => 'setID', -value=>$problem->set_id), "\n", 827 CGI::hidden(-name => 'studentUser', -value=>$problem->user_id), "\n", 828 CGI::p( {-align=>"left"}, 829 CGI::submit(-name => 'action', -value=>'Show Past Answers') 830 ), "\n", 831 CGI::endform(); 832 } 833 834 # feedback form url 835 my $feedbackPage = $urlpath->newFromModule("WeBWorK::ContentGenerator::Feedback", 836 courseID => $courseName); 837 my $feedbackURL = $self->systemLink($feedbackPage, authen => 0); # no authen info for form action 838 839 #print feedback form 840 print 841 CGI::start_form(-method=>"POST", -action=>$feedbackURL),"\n", 842 $self->hidden_authen_fields,"\n", 843 CGI::hidden("module", __PACKAGE__),"\n", 844 CGI::hidden("set", $set->set_id),"\n", 845 CGI::hidden("problem", $problem->problem_id),"\n", 846 CGI::hidden("displayMode", $self->{displayMode}),"\n", 847 CGI::hidden("showOldAnswers", $will{showOldAnswers}),"\n", 848 CGI::hidden("showCorrectAnswers", $will{showCorrectAnswers}),"\n", 849 CGI::hidden("showHints", $will{showHints}),"\n", 850 CGI::hidden("showSolutions", $will{showSolutions}),"\n", 851 CGI::p({-align=>"left"}, 852 CGI::submit(-name=>"feedbackForm", -label=>"Email instructor") 853 ), 854 CGI::endform(),"\n"; 855 856 # FIXME print editor link 857 print $editorLink; #empty unless it is appropriate to have an editor link. 858 859 print CGI::end_div(); 860 861 # debugging stuff 862 if (0) { 863 print 864 CGI::hr(), 865 CGI::h2("debugging information"), 866 CGI::h3("form fields"), 867 ref2string($self->{formFields}), 868 CGI::h3("user object"), 869 ref2string($self->{user}), 870 CGI::h3("set object"), 871 ref2string($set), 872 CGI::h3("problem object"), 873 ref2string($problem), 874 CGI::h3("PG object"), 875 ref2string($pg, {'WeBWorK::PG::Translator' => 1}); 876 } 877 878 return ""; 879 } 880 881 ##### output utilities ##### 882 883 sub attemptResults { 884 my $self = shift; 885 my $pg = shift; 886 my $showAttemptAnswers = shift; 887 my $showCorrectAnswers = shift; 888 my $showAttemptResults = $showAttemptAnswers && shift; 889 my $showSummary = shift; 890 my $showAttemptPreview = shift || 0; 891 892 my $ce = $self->r->ce; 893 894 my $problemResult = $pg->{result}; # the overall result of the problem 895 my @answerNames = @{ $pg->{flags}->{ANSWER_ENTRY_ORDER} }; 896 897 my $showMessages = $showAttemptAnswers && grep { $pg->{answers}->{$_}->{ans_message} } @answerNames; 898 899 my $basename = "equation-" . $self->{set}->psvn. "." . $self->{problem}->problem_id . "-preview"; 900 901 # to make grabbing these options easier, we'll pull them out now... 902 my %imagesModeOptions = %{$ce->{pg}->{displayModeOptions}->{images}}; 903 904 my $imgGen = WeBWorK::PG::ImageGenerator->new( 905 tempDir => $ce->{webworkDirs}->{tmp}, 906 latex => $ce->{externalPrograms}->{latex}, 907 dvipng => $ce->{externalPrograms}->{dvipng}, 908 useCache => 1, 909 cacheDir => $ce->{webworkDirs}->{equationCache}, 910 cacheURL => $ce->{webworkURLs}->{equationCache}, 911 cacheDB => $ce->{webworkFiles}->{equationCacheDB}, 912 dvipng_align => $imagesModeOptions{dvipng_align}, 913 dvipng_depth_db => $imagesModeOptions{dvipng_depth_db}, 914 ); 915 916 my $header; 917 #$header .= CGI::th("Part"); 918 $header .= $showAttemptAnswers ? CGI::th("Entered") : ""; 919 $header .= $showAttemptPreview ? CGI::th("Answer Preview") : ""; 920 $header .= $showCorrectAnswers ? CGI::th("Correct") : ""; 921 $header .= $showAttemptResults ? CGI::th("Result") : ""; 922 $header .= $showMessages ? CGI::th("Messages") : ""; 923 my @tableRows = ( $header ); 924 my $numCorrect = 0; 925 foreach my $name (@answerNames) { 926 my $answerResult = $pg->{answers}->{$name}; 927 my $studentAnswer = $answerResult->{student_ans}; # original_student_ans 928 my $preview = ($showAttemptPreview 929 ? $self->previewAnswer($answerResult, $imgGen) 930 : ""); 931 my $correctAnswer = $answerResult->{correct_ans}; 932 my $answerScore = $answerResult->{score}; 933 my $answerMessage = $showMessages ? $answerResult->{ans_message} : ""; 934 #FIXME --Can we be sure that $answerScore is an integer-- could the problem give partial credit? 935 $numCorrect += $answerScore > 0; 936 my $resultString = $answerScore == 1 ? "correct" : "incorrect"; 937 938 # get rid of the goofy prefix on the answer names (supposedly, the format 939 # of the answer names is changeable. this only fixes it for "AnSwEr" 940 #$name =~ s/^AnSwEr//; 941 942 my $row; 943 #$row .= CGI::td($name); 944 $row .= $showAttemptAnswers ? CGI::td($self->nbsp($studentAnswer)) : ""; 945 $row .= $showAttemptPreview ? CGI::td($self->nbsp($preview)) : ""; 946 $row .= $showCorrectAnswers ? CGI::td($self->nbsp($correctAnswer)) : ""; 947 $row .= $showAttemptResults ? CGI::td($self->nbsp($resultString)) : ""; 948 $row .= $showMessages ? CGI::td($self->nbsp($answerMessage)) : ""; 949 push @tableRows, $row; 950 } 951 952 # render equation images 953 $imgGen->render(refresh => 1); 954 955 # my $numIncorrectNoun = scalar @answerNames == 1 ? "question" : "questions"; 956 my $scorePercent = sprintf("%.0f%%", $problemResult->{score} * 100); 957 # FIXME -- I left the old code in in case we have to back out. 958 # my $summary = "On this attempt, you answered $numCorrect out of " 959 # . scalar @answerNames . " $numIncorrectNoun correct, for a score of $scorePercent."; 960 my $summary = ""; 961 if (scalar @answerNames == 1) { 962 if ($numCorrect == scalar @answerNames) { 963 $summary .= CGI::div({class=>"ResultsWithoutError"},"The above answer is correct."); 964 } else { 965 $summary .= CGI::div({class=>"ResultsWithError"},"The above answer is NOT correct."); 966 } 967 } else { 968 if ($numCorrect == scalar @answerNames) { 969 $summary .= CGI::div({class=>"ResultsWithoutError"},"All of the above answers are correct."); 970 } else { 971 $summary .= CGI::div({class=>"ResultsWithError"},"At least one of the above answers is NOT correct."); 972 } 973 } 974 975 return 976 CGI::table({-class=>"attemptResults"}, CGI::Tr(\@tableRows)) 977 . ($showSummary ? CGI::p({class=>'emphasis'},$summary) : ""); 978 } 979 980 #sub nbsp { 981 # my $str = shift; 982 # ($str =~/\S/) ? $str : ' ' ; # returns non-breaking space for empty strings 983 # # tricky cases: $str =0; 984 # # $str is a complex number 985 #} 986 987 sub viewOptions { 988 my ($self) = @_; 989 my $ce = $self->r->ce; 990 991 # don't show options if we don't have anything to show 992 return if $self->{invalidSet} or $self->{invalidProblem}; 993 return unless $self->{isOpen}; 994 995 my $displayMode = $self->{displayMode}; 996 my %must = %{ $self->{must} }; 997 my %can = %{ $self->{can} }; 998 my %will = %{ $self->{will} }; 999 1000 my $optionLine; 1001 $can{showOldAnswers} and $optionLine .= join "", 1002 "Show: ".CGI::br(), 1003 CGI::checkbox( 1004 -name => "showOldAnswers", 1005 -checked => $will{showOldAnswers}, 1006 -label => "Saved answers", 1007 ), " ".CGI::br(); 1008 1009 $optionLine and $optionLine .= join "", CGI::br(); 1010 1011 my %display_modes = %{WeBWorK::PG::DISPLAY_MODES()}; 1012 my @active_modes = grep { exists $display_modes{$_} } 1013 @{$ce->{pg}->{displayModes}}; 1014 my $modeLine = (scalar(@active_modes)>1) ? 1015 "View equations as: ".CGI::br(). 1016 CGI::radio_group( 1017 -name => "displayMode", 1018 -values => \@active_modes, 1019 -default => $displayMode, 1020 -linebreak=>'true', 1021 -labels => { 1022 plainText => "plain", 1023 formattedText => "formatted", 1024 images => "images", 1025 jsMath => "jsMath", 1026 asciimath => "asciimath", 1027 }, 1028 ). CGI::br().CGI::hr() : ''; 1029 1030 return CGI::div({-style=>"border: thin groove; padding: 1ex; margin: 2ex align: left"}, 1031 $modeLine, 1032 $optionLine, 1033 CGI::submit(-name=>"redisplay", -label=>"Save Options"), 1034 ); 1035 } 1036 1037 sub previewAnswer { 1038 my ($self, $answerResult, $imgGen) = @_; 1039 my $ce = $self->r->ce; 1040 my $effectiveUser = $self->{effectiveUser}; 1041 my $set = $self->{set}; 1042 my $problem = $self->{problem}; 1043 my $displayMode = $self->{displayMode}; 1044 1045 # note: right now, we have to do things completely differently when we are 1046 # rendering math from INSIDE the translator and from OUTSIDE the translator. 1047 # so we'll just deal with each case explicitly here. there's some code 1048 # duplication that can be dealt with later by abstracting out tth/dvipng/etc. 1049 1050 my $tex = $answerResult->{preview_latex_string}; 1051 1052 return "" unless defined $tex and $tex ne ""; 1053 1054 if ($displayMode eq "plainText") { 1055 return $tex; 1056 } elsif ($displayMode eq "formattedText") { 1057 my $tthCommand = $ce->{externalPrograms}->{tth} 1058 . " -L -f5 -r 2> /dev/null <<END_OF_INPUT; echo > /dev/null\n" 1059 . "\\(".$tex."\\)\n" 1060 . "END_OF_INPUT\n"; 1061 1062 # call tth 1063 my $result = `$tthCommand`; 1064 if ($?) { 1065 return "<b>[tth failed: $? $@]</b>"; 1066 } 1067 return $result; 1068 } elsif ($displayMode eq "images") { 1069 $imgGen->add($tex); 1070 } elsif ($displayMode eq "jsMath") { 1071 1072 return '<DIV CLASS="math">'.$tex.'</DIV>' ; 1073 1074 1075 1076 1077 } 1078 } 1079 1080 ##### permission queries ##### 1081 1082 # this stuff should be abstracted out into the permissions system 1083 # however, the permission system only knows about things in the 1084 # course environment and the username. hmmm... 1085 1086 # also, i should fix these so that they have a consistent calling 1087 # format -- perhaps: 1088 # canPERM($ce, $user, $set, $problem, $permissionLevel) 1089 1090 sub canShowCorrectAnswers($$) { 1091 my ($permissionLevel, $answerDate) = @_; 1092 return $permissionLevel > 0 || time > $answerDate; 1093 } 1094 1095 sub canShowSolutions($$) { 1096 my ($permissionLevel, $answerDate) = @_; 1097 return canShowCorrectAnswers($permissionLevel, $answerDate); 1098 } 1099 1100 sub canRecordAnswers($$$$$) { 1101 my ($permissionLevel, $openDate, $dueDate, $maxAttempts, $attempts) = @_; 1102 my $permHigh = $permissionLevel > 0; 1103 my $timeOK = time >= $openDate && time <= $dueDate; 1104 my $attemptsOK = $maxAttempts == -1 || $attempts <= $maxAttempts; 1105 my $recordAnswers = $permHigh || ($timeOK && $attemptsOK); 1106 return $recordAnswers; 1107 } 1108 1109 sub canCheckAnswers($$) { 1110 my ($permissionLevel, $dueDate) = @_; 1111 my $permHigh = $permissionLevel > 0; 1112 my $timeOK = time >= $dueDate; 1113 my $recordAnswers = $permHigh || $timeOK; 1114 return $recordAnswers; 1115 } 1116 1117 sub mustRecordAnswers($) { 1118 my ($permissionLevel) = @_; 1119 return $permissionLevel == 0; 1120 } 1121 1;
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