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Revision 3337 - (download) (as text) (annotate)
Mon Jul 4 13:18:47 2005 UTC (14 years, 6 months ago) by dpvc
File size: 41284 byte(s)
Better spacing of jsMath output in the answer preview area.

    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 1.171 2005/06/28 00:16:08 sh002i 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 use URI::Escape;
   38 
   39 use WeBWorK::Utils::Tasks qw(fake_set fake_problem);
   40 
   41 ################################################################################
   42 # CGI param interface to this module (up-to-date as of v1.153)
   43 ################################################################################
   44 
   45 # Standard params:
   46 #
   47 #     user - user ID of real user
   48 #     key - session key
   49 #     effectiveUser - user ID of effective user
   50 #
   51 # Integration with PGProblemEditor:
   52 #
   53 #     editMode - if set, indicates alternate problem source location.
   54 #                can be "temporaryFile" or "savedFile".
   55 #
   56 #     sourceFilePath - path to file to be edited
   57 #     problemSeed - force problem seed to value
   58 #     success - success message to display
   59 #     failure - failure message to display
   60 #
   61 # Rendering options:
   62 #
   63 #     displayMode - name of display mode to use
   64 #
   65 #     showOldAnswers - request that last entered answer be shown (if allowed)
   66 #     showCorrectAnswers - request that correct answers be shown (if allowed)
   67 #     showHints - request that hints be shown (if allowed)
   68 #     showSolutions - request that solutions be shown (if allowed)
   69 #
   70 # Problem interaction:
   71 #
   72 #     AnSwEr# - answer blanks in problem
   73 #
   74 #     redisplay - name of the "Redisplay Problem" button
   75 #     submitAnswers - name of "Submit Answers" button
   76 #     checkAnswers - name of the "Check Answers" button
   77 #     previewAnswers - name of the "Preview Answers" button
   78 
   79 ################################################################################
   80 # "can" methods
   81 ################################################################################
   82 
   83 # Subroutines to determine if a user "can" perform an action. Each subroutine is
   84 # called with the following arguments:
   85 #
   86 #     ($self, $User, $EffectiveUser, $Set, $Problem)
   87 
   88 sub can_showOldAnswers {
   89   #my ($self, $User, $EffectiveUser, $Set, $Problem) = @_;
   90 
   91   return 1;
   92 }
   93 
   94 sub can_showCorrectAnswers {
   95   my ($self, $User, $EffectiveUser, $Set, $Problem) = @_;
   96   my $authz = $self->r->authz;
   97 
   98   return
   99     after($Set->answer_date)
  100       ||
  101     $authz->hasPermissions($User->user_id, "show_correct_answers_before_answer_date")
  102     ;
  103 }
  104 
  105 sub can_showHints {
  106   #my ($self, $User, $EffectiveUser, $Set, $Problem) = @_;
  107 
  108   return 1;
  109 }
  110 
  111 sub can_showSolutions {
  112   my ($self, $User, $EffectiveUser, $Set, $Problem) = @_;
  113   my $authz = $self->r->authz;
  114 
  115   return
  116     after($Set->answer_date)
  117       ||
  118     $authz->hasPermissions($User->user_id, "show_solutions_before_answer_date")
  119     ;
  120 }
  121 
  122 sub can_recordAnswers {
  123   my ($self, $User, $EffectiveUser, $Set, $Problem, $submitAnswers) = @_;
  124   my $authz = $self->r->authz;
  125   my $thisAttempt = $submitAnswers ? 1 : 0;
  126   if ($User->user_id ne $EffectiveUser->user_id) {
  127     return $authz->hasPermissions($User->user_id, "record_answers_when_acting_as_student");
  128   }
  129   if (before($Set->open_date)) {
  130     return $authz->hasPermissions($User->user_id, "record_answers_before_open_date");
  131   } elsif (between($Set->open_date, $Set->due_date)) {
  132     my $max_attempts = $Problem->max_attempts;
  133     my $attempts_used = $Problem->num_correct + $Problem->num_incorrect + $thisAttempt;
  134     if ($max_attempts == -1 or $attempts_used < $max_attempts) {
  135       return $authz->hasPermissions($User->user_id, "record_answers_after_open_date_with_attempts");
  136     } else {
  137       return $authz->hasPermissions($User->user_id, "record_answers_after_open_date_without_attempts");
  138     }
  139   } elsif (between($Set->due_date, $Set->answer_date)) {
  140     return $authz->hasPermissions($User->user_id, "record_answers_after_due_date");
  141   } elsif (after($Set->answer_date)) {
  142     return $authz->hasPermissions($User->user_id, "record_answers_after_answer_date");
  143   }
  144 }
  145 
  146 sub can_checkAnswers {
  147   my ($self, $User, $EffectiveUser, $Set, $Problem, $submitAnswers) = @_;
  148   my $authz = $self->r->authz;
  149   my $thisAttempt = $submitAnswers ? 1 : 0;
  150 
  151   if (before($Set->open_date)) {
  152     return $authz->hasPermissions($User->user_id, "check_answers_before_open_date");
  153   } elsif (between($Set->open_date, $Set->due_date)) {
  154     my $max_attempts = $Problem->max_attempts;
  155     my $attempts_used = $Problem->num_correct + $Problem->num_incorrect + $thisAttempt;
  156     if ($max_attempts == -1 or $attempts_used < $max_attempts) {
  157       return $authz->hasPermissions($User->user_id, "check_answers_after_open_date_with_attempts");
  158     } else {
  159       return $authz->hasPermissions($User->user_id, "check_answers_after_open_date_without_attempts");
  160     }
  161   } elsif (between($Set->due_date, $Set->answer_date)) {
  162     return $authz->hasPermissions($User->user_id, "check_answers_after_due_date");
  163   } elsif (after($Set->answer_date)) {
  164     return $authz->hasPermissions($User->user_id, "check_answers_after_answer_date");
  165   }
  166 }
  167 
  168 # Helper functions for calculating times
  169 sub before  { return time <= $_[0] }
  170 sub after   { return time >= $_[0] }
  171 sub between { my $t = time; return $t > $_[0] && $t < $_[1] }
  172 
  173 ################################################################################
  174 # output utilities
  175 ################################################################################
  176 
  177 sub attemptResults {
  178   my $self = shift;
  179   my $pg = shift;
  180   my $showAttemptAnswers = shift;
  181   my $showCorrectAnswers = shift;
  182   my $showAttemptResults = $showAttemptAnswers && shift;
  183   my $showSummary = shift;
  184   my $showAttemptPreview = shift || 0;
  185 
  186   my $ce = $self->r->ce;
  187 
  188   my $problemResult = $pg->{result}; # the overall result of the problem
  189   my @answerNames = @{ $pg->{flags}->{ANSWER_ENTRY_ORDER} };
  190 
  191   my $showMessages = $showAttemptAnswers && grep { $pg->{answers}->{$_}->{ans_message} } @answerNames;
  192 
  193   my $basename = "equation-" . $self->{set}->psvn. "." . $self->{problem}->problem_id . "-preview";
  194 
  195   # to make grabbing these options easier, we'll pull them out now...
  196   my %imagesModeOptions = %{$ce->{pg}->{displayModeOptions}->{images}};
  197 
  198   my $imgGen = WeBWorK::PG::ImageGenerator->new(
  199     tempDir         => $ce->{webworkDirs}->{tmp},
  200     latex         => $ce->{externalPrograms}->{latex},
  201     dvipng          => $ce->{externalPrograms}->{dvipng},
  202     useCache        => 1,
  203     cacheDir        => $ce->{webworkDirs}->{equationCache},
  204     cacheURL        => $ce->{webworkURLs}->{equationCache},
  205     cacheDB         => $ce->{webworkFiles}->{equationCacheDB},
  206     dvipng_align    => $imagesModeOptions{dvipng_align},
  207     dvipng_depth_db => $imagesModeOptions{dvipng_depth_db},
  208   );
  209 
  210   my $header;
  211   #$header .= CGI::th("Part");
  212   $header .= $showAttemptAnswers ? CGI::th("Entered")  : "";
  213   $header .= $showAttemptPreview ? CGI::th("Answer Preview")  : "";
  214   $header .= $showCorrectAnswers ? CGI::th("Correct")  : "";
  215   $header .= $showAttemptResults ? CGI::th("Result")   : "";
  216   $header .= $showMessages       ? CGI::th("Messages") : "";
  217   my $fully = '';
  218   my @tableRows = ( $header );
  219   my $numCorrect = 0;
  220   foreach my $name (@answerNames) {
  221     my $answerResult  = $pg->{answers}->{$name};
  222     my $studentAnswer = $answerResult->{student_ans}; # original_student_ans
  223     my $preview       = ($showAttemptPreview
  224                           ? $self->previewAnswer($answerResult, $imgGen)
  225                           : "");
  226     my $correctAnswer = $answerResult->{correct_ans};
  227     my $answerScore   = $answerResult->{score};
  228     my $answerMessage = $showMessages ? $answerResult->{ans_message} : "";
  229     $answerMessage =~ s/\n/<BR>/g;
  230     $numCorrect += $answerScore >= 1;
  231     my $resultString = $answerScore >= 1 ? "correct" :
  232                        $answerScore > 0  ? int($answerScore*100)."% correct" :
  233                                                        "incorrect";
  234     $fully = 'completely ' if $answerScore >0 and $answerScore < 1;
  235 
  236     # get rid of the goofy prefix on the answer names (supposedly, the format
  237     # of the answer names is changeable. this only fixes it for "AnSwEr"
  238     #$name =~ s/^AnSwEr//;
  239 
  240     my $row;
  241     #$row .= CGI::td($name);
  242     $row .= $showAttemptAnswers ? CGI::td($self->nbsp($studentAnswer)) : "";
  243     $row .= $showAttemptPreview ? CGI::td($self->nbsp($preview))       : "";
  244     $row .= $showCorrectAnswers ? CGI::td($self->nbsp($correctAnswer)) : "";
  245     $row .= $showAttemptResults ? CGI::td($self->nbsp($resultString))  : "";
  246     $row .= $showMessages       ? CGI::td({-class=>"Message"},$self->nbsp($answerMessage)) : "";
  247     push @tableRows, $row;
  248   }
  249 
  250   # render equation images
  251   $imgGen->render(refresh => 1);
  252 
  253 # my $numIncorrectNoun = scalar @answerNames == 1 ? "question" : "questions";
  254   my $scorePercent = sprintf("%.0f%%", $problemResult->{score} * 100);
  255 #   FIXME  -- I left the old code in in case we have to back out.
  256 # my $summary = "On this attempt, you answered $numCorrect out of "
  257 #   . scalar @answerNames . " $numIncorrectNoun correct, for a score of $scorePercent.";
  258   my $summary = "";
  259   if (scalar @answerNames == 1) {
  260       if ($numCorrect == scalar @answerNames) {
  261         $summary .= CGI::div({class=>"ResultsWithoutError"},"The above answer is correct.");
  262        } else {
  263          $summary .= CGI::div({class=>"ResultsWithError"},"The above answer is NOT ${fully}correct.");
  264        }
  265   } else {
  266       if ($numCorrect == scalar @answerNames) {
  267         $summary .= CGI::div({class=>"ResultsWithoutError"},"All of the above answers are correct.");
  268        } else {
  269          $summary .= CGI::div({class=>"ResultsWithError"},"At least one of the above answers is NOT ${fully}correct.");
  270        }
  271   }
  272 
  273   return
  274     CGI::table({-class=>"attemptResults"}, CGI::Tr(\@tableRows))
  275     . ($showSummary ? CGI::p({class=>'emphasis'},$summary) : "");
  276 }
  277 
  278 
  279 sub previewAnswer {
  280   my ($self, $answerResult, $imgGen) = @_;
  281   my $ce            = $self->r->ce;
  282   my $effectiveUser = $self->{effectiveUser};
  283   my $set           = $self->{set};
  284   my $problem       = $self->{problem};
  285   my $displayMode   = $self->{displayMode};
  286 
  287   # note: right now, we have to do things completely differently when we are
  288   # rendering math from INSIDE the translator and from OUTSIDE the translator.
  289   # so we'll just deal with each case explicitly here. there's some code
  290   # duplication that can be dealt with later by abstracting out tth/dvipng/etc.
  291 
  292   my $tex = $answerResult->{preview_latex_string};
  293 
  294   return "" unless defined $tex and $tex ne "";
  295 
  296   if ($displayMode eq "plainText") {
  297     return $tex;
  298   } elsif ($displayMode eq "formattedText") {
  299     my $tthCommand = $ce->{externalPrograms}->{tth}
  300       . " -L -f5 -r 2> /dev/null <<END_OF_INPUT; echo > /dev/null\n"
  301       . "\\(".$tex."\\)\n"
  302       . "END_OF_INPUT\n";
  303 
  304     # call tth
  305     my $result = `$tthCommand`;
  306     if ($?) {
  307       return "<b>[tth failed: $? $@]</b>";
  308     } else {
  309       return $result;
  310     }
  311   } elsif ($displayMode eq "images") {
  312     $imgGen->add($tex);
  313   } elsif ($displayMode eq "jsMath") {
  314     return '<SPAN CLASS="math">\\displaystyle{'.$tex.'}</SPAN>';
  315   }
  316 }
  317 
  318 ################################################################################
  319 # Template escape implementations
  320 ################################################################################
  321 
  322 sub pre_header_initialize {
  323   my ($self) = @_;
  324   my $r = $self->r;
  325   my $ce = $r->ce;
  326   my $db = $r->db;
  327   my $authz = $r->authz;
  328   my $urlpath = $r->urlpath;
  329 
  330   my $setName = $urlpath->arg("setID");
  331   my $problemNumber = $r->urlpath->arg("problemID");
  332   my $userName = $r->param('user');
  333   my $effectiveUserName = $r->param('effectiveUser');
  334   my $key = $r->param('key');
  335 
  336   my $user = $db->getUser($userName); # checked
  337   die "record for user $userName (real user) does not exist."
  338     unless defined $user;
  339 
  340   my $effectiveUser = $db->getUser($effectiveUserName); # checked
  341   die "record for user $effectiveUserName (effective user) does not exist."
  342     unless defined $effectiveUser;
  343 
  344   # obtain the merged set for $effectiveUser
  345   my $set = $db->getMergedSet($effectiveUserName, $setName); # checked
  346 
  347   # Database fix (in case of undefined published values)
  348   # this is only necessary because some people keep holding to ww1.9 which did not have a published field
  349   # make sure published is set to 0 or 1
  350   if ( $set and $set->published ne "0" and $set->published ne "1") {
  351     my $globalSet = $db->getGlobalSet($set->set_id);
  352     $globalSet->published("1"); # defaults to published
  353     $db->putGlobalSet($globalSet);
  354     $set = $db->getMergedSet($effectiveUserName, $setName);
  355   } else {
  356     # don't do anything just yet, maybe we're a professor and we're
  357     # fabricating a set or haven't assigned it to ourselves just yet
  358   }
  359 
  360   # obtain the merged problem for $effectiveUser
  361   my $problem = $db->getMergedProblem($effectiveUserName, $setName, $problemNumber); # checked
  362 
  363   my $editMode = $r->param("editMode");
  364 
  365   if ($authz->hasPermissions($userName, "modify_problem_sets")) {
  366     # professors are allowed to fabricate sets and problems not
  367     # assigned to them (or anyone). this allows them to use the
  368     # editor to
  369 
  370     # if a User Set does not exist for this user and this set
  371     # then we check the Global Set
  372     # if that does not exist we create a fake set
  373     # if it does, we add fake user data
  374     unless (defined $set) {
  375       my $userSetClass = $db->{set_user}->{record};
  376       my $globalSet = $db->getGlobalSet($setName); # checked
  377 
  378       if (not defined $globalSet) {
  379         $set = fake_set($db);
  380       } else {
  381         $set = global2user($userSetClass, $globalSet);
  382         $set->psvn(0);
  383       }
  384     }
  385 
  386     # if that is not yet defined obtain the global problem,
  387     # convert it to a user problem, and add fake user data
  388     unless (defined $problem) {
  389       my $userProblemClass = $db->{problem_user}->{record};
  390       my $globalProblem = $db->getGlobalProblem($setName, $problemNumber); # checked
  391       # if the global problem doesn't exist either, bail!
  392       if(not defined $globalProblem) {
  393         my $sourceFilePath = $r->param("sourceFilePath");
  394         # These are problems from setmaker.  If declared invalid, they won't come up
  395         $self->{invalidProblem} = $self->{invalidSet} = 1 unless defined $sourceFilePath;
  396 #       die "Problem $problemNumber in set $setName does not exist" unless defined $sourceFilePath;
  397         $problem = fake_problem($db);
  398         $problem->problem_id(1);
  399         $problem->source_file($sourceFilePath);
  400         $problem->user_id($effectiveUserName);
  401       } else {
  402         $problem = global2user($userProblemClass, $globalProblem);
  403         $problem->user_id($effectiveUserName);
  404         $problem->problem_seed(0);
  405         $problem->status(0);
  406         $problem->attempted(0);
  407         $problem->last_answer("");
  408         $problem->num_correct(0);
  409         $problem->num_incorrect(0);
  410       }
  411     }
  412 
  413     # now we're sure we have valid UserSet and UserProblem objects
  414     # yay!
  415 
  416     # now deal with possible editor overrides:
  417 
  418     # if the caller is asking to override the source file, and
  419     # editMode calls for a temporary file, do so
  420     my $sourceFilePath = $r->param("sourceFilePath");
  421     if (defined $sourceFilePath and
  422         (not defined $editMode or $editMode eq "temporaryFile")) {
  423       $problem->source_file($sourceFilePath);
  424     }
  425 
  426     # if the problem does not have a source file or no source file has been passed in
  427     # then this is really an invalid problem (probably from a bad URL)
  428     $self->{invalidProblem} = not (defined $sourceFilePath or $problem->source_file);
  429 
  430     # if the caller is asking to override the problem seed, do so
  431     my $problemSeed = $r->param("problemSeed");
  432     if (defined $problemSeed) {
  433       $problem->problem_seed($problemSeed);
  434     }
  435 
  436     my $publishedClass = ($set->published) ? "Published" : "Unpublished";
  437     my $publishedText = ($set->published) ? "visible to students." : "hidden from students.";
  438     $self->addmessage(CGI::p("This set is " . CGI::font({class=>$publishedClass}, $publishedText)));
  439   } else {
  440 
  441     # A set is valid if it exists and if it is either published or the user is privileged.
  442     $self->{invalidSet} = !(defined $set and ($set->published || $authz->hasPermissions($userName, "view_unpublished_sets")));
  443     $self->{invalidProblem} = !(defined $problem and ($set->published || $authz->hasPermissions($userName, "view_unpublished_sets")));
  444 
  445     $self->addbadmessage(CGI::p("This problem will not count towards your grade.")) if $problem and not $problem->value and not $self->{invalidProblem};
  446   }
  447 
  448   $self->{userName}          = $userName;
  449   $self->{effectiveUserName} = $effectiveUserName;
  450   $self->{user}              = $user;
  451   $self->{effectiveUser}     = $effectiveUser;
  452   $self->{set}               = $set;
  453   $self->{problem}           = $problem;
  454   $self->{editMode}          = $editMode;
  455 
  456   ##### form processing #####
  457 
  458   # set options from form fields (see comment at top of file for names)
  459   my $displayMode        = $r->param("displayMode") || $ce->{pg}->{options}->{displayMode};
  460   my $redisplay          = $r->param("redisplay");
  461   my $submitAnswers      = $r->param("submitAnswers");
  462   my $checkAnswers       = $r->param("checkAnswers");
  463   my $previewAnswers     = $r->param("previewAnswers");
  464 
  465   my $formFields = { WeBWorK::Form->new_from_paramable($r)->Vars };
  466 
  467   $self->{displayMode}    = $displayMode;
  468   $self->{redisplay}      = $redisplay;
  469   $self->{submitAnswers}  = $submitAnswers;
  470   $self->{checkAnswers}   = $checkAnswers;
  471   $self->{previewAnswers} = $previewAnswers;
  472   $self->{formFields}     = $formFields;
  473 
  474   # get result and send to message
  475   my $status_message = $r->param("status_message");
  476   $self->addmessage(CGI::p("$status_message")) if $status_message;
  477 
  478   # now that we've set all the necessary variables quit out if the set or problem is invalid
  479   return if $self->{invalidSet} || $self->{invalidProblem};
  480 
  481   ##### permissions #####
  482 
  483   # are we allowed to view this problem?
  484   $self->{isOpen} = after($set->open_date) || $authz->hasPermissions($userName, "view_unopened_sets");
  485   return unless $self->{isOpen};
  486 
  487   # what does the user want to do?
  488   #FIXME  There is a problem with checkboxes -- if they are not checked they are invisible.  Hence if the default mode in $ce is 1
  489   # there is no way to override this.  Probably this is ok for the last three options, but it was definitely not ok for showing
  490   # saved answers which is normally on, but you want to be able to turn it off!  This section should be moved to ContentGenerator
  491   # so that you can set these options anywhere.  We also need mechanisms for making them sticky.
  492   my %want = (
  493     showOldAnswers     => defined($r->param("showOldAnswers")) ? $r->param("showOldAnswers")  : $ce->{pg}->{options}->{showOldAnswers},
  494     showCorrectAnswers => $r->param("showCorrectAnswers") || $ce->{pg}->{options}->{showCorrectAnswers},
  495     showHints          => $r->param("showHints")          || $ce->{pg}->{options}->{showHints},
  496     showSolutions      => $r->param("showSolutions")      || $ce->{pg}->{options}->{showSolutions},
  497     recordAnswers      => $submitAnswers,
  498     checkAnswers       => $checkAnswers,
  499     getSubmitButton    => 1,
  500   );
  501 
  502   # are certain options enforced?
  503   my %must = (
  504     showOldAnswers     => 0,
  505     showCorrectAnswers => 0,
  506     showHints          => 0,
  507     showSolutions      => 0,
  508     recordAnswers      => ! $authz->hasPermissions($userName, "avoid_recording_answers"),
  509     checkAnswers       => 0,
  510     getSubmitButton    => 0,
  511   );
  512 
  513   # does the user have permission to use certain options?
  514   my @args = ($user, $effectiveUser, $set, $problem);
  515   my %can = (
  516     showOldAnswers     => $self->can_showOldAnswers(@args),
  517     showCorrectAnswers => $self->can_showCorrectAnswers(@args),
  518     showHints          => $self->can_showHints(@args),
  519     showSolutions      => $self->can_showSolutions(@args),
  520     recordAnswers      => $self->can_recordAnswers(@args, 0),
  521     checkAnswers       => $self->can_checkAnswers(@args, $submitAnswers),
  522     getSubmitButton    => $self->can_recordAnswers(@args, $submitAnswers),
  523   );
  524 
  525   # final values for options
  526   my %will;
  527   foreach (keys %must) {
  528     $will{$_} = $can{$_} && ($want{$_} || $must{$_});
  529   }
  530 
  531   ##### sticky answers #####
  532 
  533   if (not ($submitAnswers or $previewAnswers or $checkAnswers) and $will{showOldAnswers}) {
  534     # do this only if new answers are NOT being submitted
  535     my %oldAnswers = decodeAnswers($problem->last_answer);
  536     $formFields->{$_} = $oldAnswers{$_} foreach keys %oldAnswers;
  537   }
  538 
  539   ##### translation #####
  540 
  541   $WeBWorK::timer->continue("begin pg processing") if defined($WeBWorK::timer);
  542   my $pg = WeBWorK::PG->new(
  543     $ce,
  544     $effectiveUser,
  545     $key,
  546     $set,
  547     $problem,
  548     $set->psvn, # FIXME: this field should be removed
  549     $formFields,
  550     { # translation options
  551       displayMode     => $displayMode,
  552       showHints       => $will{showHints},
  553       showSolutions   => $will{showSolutions},
  554       refreshMath2img => $will{showHints} || $will{showSolutions},
  555       processAnswers  => 1,
  556     },
  557   );
  558 
  559   $WeBWorK::timer->continue("end pg processing") if defined($WeBWorK::timer);
  560 
  561   ##### fix hint/solution options #####
  562 
  563   $can{showHints}     &&= $pg->{flags}->{hintExists}
  564                       &&= $pg->{flags}->{showHintLimit}<=$pg->{state}->{num_of_incorrect_ans};
  565   $can{showSolutions} &&= $pg->{flags}->{solutionExists};
  566 
  567   ##### store fields #####
  568 
  569   $self->{want} = \%want;
  570   $self->{must} = \%must;
  571   $self->{can}  = \%can;
  572   $self->{will} = \%will;
  573   $self->{pg} = $pg;
  574 }
  575 
  576 sub if_errors($$) {
  577   my ($self, $arg) = @_;
  578 
  579   if ($self->{isOpen}) {
  580     return $self->{pg}->{flags}->{error_flag} ? $arg : !$arg;
  581   } else {
  582     return !$arg;
  583   }
  584 }
  585 
  586 sub head {
  587   my ($self) = @_;
  588 
  589   return "" unless $self->{isOpen};
  590   return $self->{pg}->{head_text} if $self->{pg}->{head_text};
  591 }
  592 
  593 # sub options {
  594 #   my ($self) = @_;
  595 #   warn "doing options in Problem";
  596 #   return "" if $self->{invalidProblem};
  597 #   my $sourceFilePathfield = '';
  598 #         if($self->r->param("sourceFilePath")) {
  599 #     $sourceFilePathfield = CGI::hidden(-name => "sourceFilePath",
  600 #                                                    -value => $self->r->param("sourceFilePath"));
  601 #   }
  602 #
  603 #   return join("",
  604 #     CGI::start_form("POST", $self->{r}->uri),
  605 #     $self->hidden_authen_fields,
  606 #     $sourceFilePathfield,
  607 #     CGI::hr(),
  608 #     CGI::start_div({class=>"viewOptions"}),
  609 #     $self->viewOptions(),
  610 #     CGI::end_div(),
  611 #     CGI::end_form()
  612 #   );
  613 # }
  614 
  615 sub siblings {
  616   my ($self) = @_;
  617   my $r = $self->r;
  618   my $db = $r->db;
  619   my $urlpath = $r->urlpath;
  620 
  621   # can't show sibling problems if the set is invalid
  622   return "" if $self->{invalidSet};
  623 
  624   my $courseID = $urlpath->arg("courseID");
  625   my $setID = $self->{set}->set_id;
  626   my $eUserID = $r->param("effectiveUser");
  627   my @problemIDs = sort { $a <=> $b } $db->listUserProblems($eUserID, $setID);
  628 
  629   print CGI::start_ul({class=>"LinksMenu"});
  630   print CGI::start_li();
  631   print CGI::span({style=>"font-size:larger"}, "Problems");
  632   print CGI::start_ul();
  633 
  634   foreach my $problemID (@problemIDs) {
  635     my $problemPage = $urlpath->newFromModule("WeBWorK::ContentGenerator::Problem",
  636       courseID => $courseID, setID => $setID, problemID => $problemID);
  637     print CGI::li(CGI::a( {href=>$self->systemLink($problemPage,
  638                           params=>{  displayMode => $self->{displayMode},
  639                                  showOldAnswers => $self->{will}->{showOldAnswers}
  640                               })},  "Problem $problemID")
  641      );
  642   }
  643 
  644   print CGI::end_ul();
  645   print CGI::end_li();
  646   print CGI::end_ul();
  647 
  648   return "";
  649 }
  650 
  651 sub nav {
  652   my ($self, $args) = @_;
  653   my $r = $self->r;
  654   my $db = $r->db;
  655   my $urlpath = $r->urlpath;
  656 
  657   my $courseID = $urlpath->arg("courseID");
  658   my $setID = $self->{set}->set_id if !($self->{invalidSet});
  659   my $problemID = $self->{problem}->problem_id if !($self->{invalidProblem});
  660   my $eUserID = $r->param("effectiveUser");
  661 
  662   my ($prevID, $nextID);
  663 
  664   if (!$self->{invalidProblem}) {
  665     my @problemIDs = $db->listUserProblems($eUserID, $setID);
  666     foreach my $id (@problemIDs) {
  667       $prevID = $id if $id < $problemID
  668         and (not defined $prevID or $id > $prevID);
  669       $nextID = $id if $id > $problemID
  670         and (not defined $nextID or $id < $nextID);
  671     }
  672   }
  673 
  674   my @links;
  675 
  676   if ($prevID) {
  677     my $prevPage = $urlpath->newFromModule(__PACKAGE__,
  678       courseID => $courseID, setID => $setID, problemID => $prevID);
  679     push @links, "Previous Problem", $r->location . $prevPage->path, "navPrev";
  680   } else {
  681     push @links, "Previous Problem", "", "navPrev";
  682   }
  683 
  684   push @links, "Problem List", $r->location . $urlpath->parent->path, "navProbList";
  685 
  686   if ($nextID) {
  687     my $nextPage = $urlpath->newFromModule(__PACKAGE__,
  688       courseID => $courseID, setID => $setID, problemID => $nextID);
  689     push @links, "Next Problem", $r->location . $nextPage->path, "navNext";
  690   } else {
  691     push @links, "Next Problem", "", "navNext";
  692   }
  693 
  694   my $tail = "&displayMode=".$self->{displayMode}."&showOldAnswers=".$self->{will}->{showOldAnswers};
  695   return $self->navMacro($args, $tail, @links);
  696 }
  697 
  698 sub title {
  699   my ($self) = @_;
  700 
  701   # using the url arguments won't break if the set/problem are invalid
  702   my $setID = $self->r->urlpath->arg("setID");
  703   my $problemID = $self->r->urlpath->arg("problemID");
  704 
  705   return "$setID: Problem $problemID";
  706 }
  707 
  708 sub body {
  709   my $self = shift;
  710   my $r = $self->r;
  711   my $ce = $r->ce;
  712   my $db = $r->db;
  713   my $authz = $r->authz;
  714   my $urlpath = $r->urlpath;
  715   my $user = $r->param('user');
  716   my $effectiveUser = $r->param('effectiveUser');
  717 
  718   if ($self->{invalidSet}) {
  719     return CGI::div({class=>"ResultsWithError"},
  720       CGI::p("The selected problem set (" . $urlpath->arg("setID") . ") is not a valid set for " . $r->param("effectiveUser") . "."));
  721   }
  722 
  723   if ($self->{invalidProblem}) {
  724     return CGI::div({class=>"ResultsWithError"},
  725       CGI::p("The selected problem (" . $urlpath->arg("problemID") . ") is not a valid problem for set " . $self->{set}->set_id . "."));
  726   }
  727 
  728   unless ($self->{isOpen}) {
  729     return CGI::div({class=>"ResultsWithError"},
  730       CGI::p("This problem is not available because the problem set that contains it is not yet open."));
  731   }
  732   # unpack some useful variables
  733   my $set             = $self->{set};
  734   my $problem         = $self->{problem};
  735   my $editMode        = $self->{editMode};
  736   my $submitAnswers   = $self->{submitAnswers};
  737   my $checkAnswers    = $self->{checkAnswers};
  738   my $previewAnswers  = $self->{previewAnswers};
  739   my %want            = %{ $self->{want} };
  740   my %can             = %{ $self->{can}  };
  741   my %must            = %{ $self->{must} };
  742   my %will            = %{ $self->{will} };
  743   my $pg              = $self->{pg};
  744 
  745   my $courseName = $urlpath->arg("courseID");
  746 
  747   # FIXME: move editor link to top, next to problem number.
  748   # format as "[edit]" like we're doing with course info file, etc.
  749   # add edit link for set as well.
  750   my $editorLink = "";
  751   # if we are here without a real problem set, carry that through
  752   my $forced_field = [];
  753   $forced_field = ['sourceFilePath' =>  $r->param("sourceFilePath")] if
  754     ($set->set_id eq 'Undefined_Set');
  755   if ($authz->hasPermissions($user, "modify_problem_sets")) {
  756     my $editorPage = $urlpath->newFromModule("WeBWorK::ContentGenerator::Instructor::PGProblemEditor",
  757       courseID => $courseName, setID => $set->set_id, problemID => $problem->problem_id);
  758     my $editorURL = $self->systemLink($editorPage, params=>$forced_field);
  759     $editorLink = CGI::a({href=>$editorURL}, "Edit this problem");
  760   }
  761 
  762   ##### translation errors? #####
  763 
  764   if ($pg->{flags}->{error_flag}) {
  765     print $self->errorOutput($pg->{errors}, $pg->{body_text});
  766     print $editorLink;
  767     return "";
  768   }
  769 
  770   ##### answer processing #####
  771   $WeBWorK::timer->continue("begin answer processing") if defined($WeBWorK::timer);
  772   # if answers were submitted:
  773   my $scoreRecordedMessage;
  774   my $pureProblem;
  775   if ($submitAnswers) {
  776     # get a "pure" (unmerged) UserProblem to modify
  777     # this will be undefined if the problem has not been assigned to this user
  778     $pureProblem = $db->getUserProblem($problem->user_id, $problem->set_id, $problem->problem_id); # checked
  779     if (defined $pureProblem) {
  780       # store answers in DB for sticky answers
  781       my %answersToStore;
  782       my %answerHash = %{ $pg->{answers} };
  783       $answersToStore{$_} = $self->{formFields}->{$_}  #$answerHash{$_}->{original_student_ans} -- this may have been modified for fields with multiple values.  Don't use it!!
  784         foreach (keys %answerHash);
  785 
  786       # There may be some more answers to store -- one which are auxiliary entries to a primary answer.  Evaluating
  787       # matrices works in this way, only the first answer triggers an answer evaluator, the rest are just inputs
  788       # however we need to store them.  Fortunately they are still in the input form.
  789       my @extra_answer_names  = @{ $pg->{flags}->{KEPT_EXTRA_ANSWERS}};
  790       $answersToStore{$_} = $self->{formFields}->{$_} foreach  (@extra_answer_names);
  791 
  792       # Now let's encode these answers to store them -- append the extra answers to the end of answer entry order
  793       my @answer_order = (@{$pg->{flags}->{ANSWER_ENTRY_ORDER}}, @extra_answer_names);
  794       my $answerString = encodeAnswers(%answersToStore,
  795          @answer_order);
  796 
  797       # store last answer to database
  798       $problem->last_answer($answerString);
  799       $pureProblem->last_answer($answerString);
  800       $db->putUserProblem($pureProblem);
  801 
  802       # store state in DB if it makes sense
  803       if ($will{recordAnswers}) {
  804         $problem->status($pg->{state}->{recorded_score});
  805         $problem->attempted(1);
  806         $problem->num_correct($pg->{state}->{num_of_correct_ans});
  807         $problem->num_incorrect($pg->{state}->{num_of_incorrect_ans});
  808         $pureProblem->status($pg->{state}->{recorded_score});
  809         $pureProblem->attempted(1);
  810         $pureProblem->num_correct($pg->{state}->{num_of_correct_ans});
  811         $pureProblem->num_incorrect($pg->{state}->{num_of_incorrect_ans});
  812         if ($db->putUserProblem($pureProblem)) {
  813           $scoreRecordedMessage = "Your score was recorded.";
  814         } else {
  815           $scoreRecordedMessage = "Your score was not recorded because there was a failure in storing the problem record to the database.";
  816         }
  817         # write to the transaction log, just to make sure
  818         writeLog($self->{ce}, "transaction",
  819           $problem->problem_id."\t".
  820           $problem->set_id."\t".
  821           $problem->user_id."\t".
  822           $problem->source_file."\t".
  823           $problem->value."\t".
  824           $problem->max_attempts."\t".
  825           $problem->problem_seed."\t".
  826           $pureProblem->status."\t".
  827           $pureProblem->attempted."\t".
  828           $pureProblem->last_answer."\t".
  829           $pureProblem->num_correct."\t".
  830           $pureProblem->num_incorrect
  831         );
  832       } else {
  833         if (before($set->open_date) or after($set->due_date)) {
  834           $scoreRecordedMessage = "Your score was not recorded because this problem set is closed.";
  835         } else {
  836           $scoreRecordedMessage = "Your score was not recorded.";
  837         }
  838       }
  839     } else {
  840       $scoreRecordedMessage = "Your score was not recorded because this problem has not been assigned to you.";
  841     }
  842   }
  843 
  844   # logging student answers
  845 
  846   my $answer_log    = $self->{ce}->{courseFiles}->{logs}->{'answer_log'};
  847   if ( defined($answer_log ) and defined($pureProblem)) {
  848     if ($submitAnswers && !$authz->hasPermissions($effectiveUser, "dont_log_past_answers")) {
  849             my $answerString = ""; my $scores = "";
  850       my %answerHash = %{ $pg->{answers} };
  851       # FIXME  this is the line 552 error.  make sure original student ans is defined.
  852       # The fact that it is not defined is probably due to an error in some answer evaluator.
  853       # But I think it is useful to suppress this error message in the log.
  854       foreach (sort keys %answerHash) {
  855         my $orig_ans = $answerHash{$_}->{original_student_ans};
  856         my $student_ans = defined $orig_ans ? $orig_ans : '';
  857         $answerString  .= $student_ans."\t";
  858         $scores .= $answerHash{$_}->{score} >= 1 ? "1" : "0";
  859       }
  860       $answerString = '' unless defined($answerString); # insure string is defined.
  861       writeCourseLog($self->{ce}, "answer_log",
  862               join("",
  863             '|', $problem->user_id,
  864             '|', $problem->set_id,
  865             '|', $problem->problem_id,
  866             '|', $scores, "\t",
  867             time(),"\t",
  868             $answerString,
  869           ),
  870       );
  871 
  872     }
  873   }
  874 
  875   $WeBWorK::timer->continue("end answer processing") if defined($WeBWorK::timer);
  876 
  877   ##### output #####
  878   # custom message for editor
  879   if ($authz->hasPermissions($user, "modify_problem_sets") and defined $editMode) {
  880     if ($editMode eq "temporaryFile") {
  881       print CGI::p(CGI::div({class=>'temporaryFile'}, "Viewing temporary file: ", $problem->source_file));
  882     } elsif ($editMode eq "savedFile") {
  883       # taken care of in the initialization phase
  884     }
  885   }
  886   print CGI::start_div({class=>"problemHeader"});
  887 
  888 
  889 
  890   # attempt summary
  891   #FIXME -- the following is a kludge:  if showPartialCorrectAnswers is negative don't show anything.
  892   # until after the due date
  893   # do I need to check $will{showCorrectAnswers} to make preflight work??
  894   if (($pg->{flags}->{showPartialCorrectAnswers} >= 0 and $submitAnswers) ) {
  895     # print this if user submitted answers OR requested correct answers
  896 
  897     print $self->attemptResults($pg, 1,
  898       $will{showCorrectAnswers},
  899       $pg->{flags}->{showPartialCorrectAnswers}, 1, 1);
  900   } elsif ($checkAnswers) {
  901     # print this if user previewed answers
  902     print CGI::div({class=>'ResultsWithError'},"ANSWERS ONLY CHECKED -- ANSWERS NOT RECORDED"), CGI::br();
  903     print $self->attemptResults($pg, 1, $will{showCorrectAnswers}, 1, 1, 1);
  904       # show attempt answers
  905       # show correct answers if asked
  906       # show attempt results (correctness)
  907       # show attempt previews
  908   } elsif ($previewAnswers) {
  909     # print this if user previewed answers
  910     print CGI::div({class=>'ResultsWithError'},"PREVIEW ONLY -- ANSWERS NOT RECORDED"),CGI::br(),$self->attemptResults($pg, 1, 0, 0, 0, 1);
  911       # show attempt answers
  912       # don't show correct answers
  913       # don't show attempt results (correctness)
  914       # show attempt previews
  915   }
  916 
  917   print CGI::end_div();
  918 
  919   # main form
  920   print CGI::startform("POST", $r->uri);
  921   print $self->hidden_authen_fields;
  922 
  923   print CGI::start_div({class=>"problem"});
  924   print CGI::p($pg->{body_text});
  925   print CGI::p(CGI::b("Note: "), CGI::i($pg->{result}->{msg})) if $pg->{result}->{msg};
  926   print CGI::end_div();
  927 
  928   print CGI::start_p();
  929 
  930   if ($can{showCorrectAnswers}) {
  931     print CGI::checkbox(
  932       -name    => "showCorrectAnswers",
  933       -checked => $will{showCorrectAnswers},
  934       -label   => "Show correct answers",
  935     );
  936   }
  937   if ($can{showHints}) {
  938     print CGI::div({style=>"color:red"},
  939       CGI::checkbox(
  940         -name    => "showHints",
  941         -checked => $will{showHints},
  942         -label   => "Show Hints",
  943       )
  944     );
  945   }
  946   if ($can{showSolutions}) {
  947     print CGI::checkbox(
  948       -name    => "showSolutions",
  949       -checked => $will{showSolutions},
  950       -label   => "Show Solutions",
  951     );
  952   }
  953 
  954   if ($can{showCorrectAnswers} or $can{showHints} or $can{showSolutions}) {
  955     print CGI::br();
  956   }
  957 
  958   print CGI::submit(-name=>"previewAnswers", -label=>"Preview Answers");
  959   if ($can{checkAnswers}) {
  960     print CGI::submit(-name=>"checkAnswers", -label=>"Check Answers");
  961   }
  962   if ($can{getSubmitButton}) {
  963     if ($user ne $effectiveUser) {
  964       # if acting as a student, make it clear that answer submissions will
  965       # apply to the student's records, not the professor's.
  966       print CGI::submit(-name=>"submitAnswers", -label=>"Submit Answers for $effectiveUser");
  967     } else {
  968       print CGI::submit(-name=>"submitAnswers", -label=>"Submit Answers");
  969     }
  970   }
  971 
  972   print CGI::end_p();
  973 
  974   print CGI::start_div({class=>"scoreSummary"});
  975 
  976   # score summary
  977   my $attempts = $problem->num_correct + $problem->num_incorrect;
  978   my $attemptsNoun = $attempts != 1 ? "times" : "time";
  979   my $problem_status    = $problem->status || 0;
  980   my $lastScore = sprintf("%.0f%%", $problem_status * 100); # Round to whole number
  981   my ($attemptsLeft, $attemptsLeftNoun);
  982   if ($problem->max_attempts == -1) {
  983     # unlimited attempts
  984     $attemptsLeft = "unlimited";
  985     $attemptsLeftNoun = "attempts";
  986   } else {
  987     $attemptsLeft = $problem->max_attempts - $attempts;
  988     $attemptsLeftNoun = $attemptsLeft == 1 ? "attempt" : "attempts";
  989   }
  990 
  991   my $setClosed = 0;
  992   my $setClosedMessage;
  993   if (before($set->open_date) or after($set->due_date)) {
  994     $setClosed = 1;
  995     if (before($set->open_date)) {
  996       $setClosedMessage = "This problem set is not yet open.";
  997     } elsif (after($set->due_date)) {
  998       $setClosedMessage = "This problem set is closed.";
  999     }
 1000   }
 1001   #if (before($set->open_date) or after($set->due_date)) {
 1002   # $setClosed = 1;
 1003   # $setClosedMessage = "This problem set is closed.";
 1004   # if ($authz->hasPermissions($user, "view_answers")) {
 1005   #   $setClosedMessage .= " However, since you are a privileged user, additional attempts will be recorded.";
 1006   # } else {
 1007   #   $setClosedMessage .= " Additional attempts will not be recorded.";
 1008   # }
 1009   #}
 1010 
 1011   my $notCountedMessage = ($problem->value) ? "" : "(This problem will not count towards your grade.)";
 1012   print CGI::p(
 1013     $submitAnswers ? $scoreRecordedMessage . CGI::br() : "",
 1014     "You have attempted this problem $attempts $attemptsNoun.", CGI::br(),
 1015     $problem->attempted
 1016       ? "Your recorded score is $lastScore.  $notCountedMessage" . CGI::br()
 1017       : "",
 1018     $setClosed ? $setClosedMessage : "You have $attemptsLeft $attemptsLeftNoun remaining."
 1019   );
 1020   print CGI::end_div();
 1021 
 1022   # save state for viewOptions
 1023   print  CGI::hidden(
 1024          -name  => "showOldAnswers",
 1025          -value => $will{showOldAnswers}
 1026        ),
 1027 
 1028        CGI::hidden(
 1029          -name  => "displayMode",
 1030          -value => $self->{displayMode}
 1031        );
 1032   print( CGI::hidden(
 1033          -name    => 'editMode',
 1034          -value   => $self->{editMode},
 1035        )
 1036   ) if defined($self->{editMode}) and $self->{editMode} eq 'temporaryFile';
 1037   print( CGI::hidden(
 1038           -name   => 'sourceFilePath',
 1039           -value  =>  $self->{problem}->{source_file}
 1040   ))  if defined($self->{problem}->{source_file});
 1041 
 1042   print( CGI::hidden(
 1043           -name   => 'problemSeed',
 1044           -value  =>  $r->param("problemSeed")
 1045   ))  if defined($r->param("problemSeed"));
 1046 
 1047   # end of main form
 1048   print CGI::endform();
 1049 
 1050   print  CGI::start_div({class=>"problemFooter"});
 1051 
 1052   ## arguments for answer inspection button
 1053   #my $prof_url = $ce->{webworkURLs}->{oldProf};
 1054   #my $webworkURL = $ce->{webworkURLs}->{root};
 1055   #my $cgi_url = $prof_url;
 1056   #$cgi_url=~ s|/[^/]*$||;  # clip profLogin.pl
 1057   #my $authen_args = $self->url_authen_args();
 1058   #my $showPastAnswersURL = "$webworkURL/$courseName/instructor/show_answers/";
 1059 
 1060   my $pastAnswersPage = $urlpath->newFromModule("WeBWorK::ContentGenerator::Instructor::ShowAnswers",
 1061     courseID => $courseName);
 1062   my $showPastAnswersURL = $self->systemLink($pastAnswersPage, authen => 0); # no authen info for form action
 1063 
 1064   # print answer inspection button
 1065   if ($authz->hasPermissions($user, "view_answers")) {
 1066     print "\n",
 1067       CGI::start_form(-method=>"POST",-action=>$showPastAnswersURL,-target=>"information"),"\n",
 1068       $self->hidden_authen_fields,"\n",
 1069       CGI::hidden(-name => 'courseID',  -value=>$courseName), "\n",
 1070       CGI::hidden(-name => 'problemID', -value=>$problem->problem_id), "\n",
 1071       CGI::hidden(-name => 'setID',  -value=>$problem->set_id), "\n",
 1072       CGI::hidden(-name => 'studentUser',    -value=>$problem->user_id), "\n",
 1073       CGI::p( {-align=>"left"},
 1074         CGI::submit(-name => 'action',  -value=>'Show Past Answers')
 1075       ), "\n",
 1076       CGI::endform();
 1077   }
 1078 
 1079   # feedback form url
 1080   my $feedbackPage = $urlpath->newFromModule("WeBWorK::ContentGenerator::Feedback",
 1081     courseID => $courseName);
 1082   my $feedbackURL = $self->systemLink($feedbackPage, authen => 0); # no authen info for form action
 1083 
 1084   #print feedback form
 1085   print
 1086     CGI::start_form(-method=>"POST", -action=>$feedbackURL),"\n",
 1087     $self->hidden_authen_fields,"\n",
 1088     CGI::hidden("module",             __PACKAGE__),"\n",
 1089     CGI::hidden("set",                $set->set_id),"\n",
 1090     CGI::hidden("problem",            $problem->problem_id),"\n",
 1091     CGI::hidden("displayMode",        $self->{displayMode}),"\n",
 1092     CGI::hidden("showOldAnswers",     $will{showOldAnswers}),"\n",
 1093     CGI::hidden("showCorrectAnswers", $will{showCorrectAnswers}),"\n",
 1094     CGI::hidden("showHints",          $will{showHints}),"\n",
 1095     CGI::hidden("showSolutions",      $will{showSolutions}),"\n",
 1096     CGI::p({-align=>"left"},
 1097       CGI::submit(-name=>"feedbackForm", -label=>"Email instructor")
 1098     ),
 1099     CGI::endform(),"\n";
 1100 
 1101   # FIXME print editor link
 1102   print $editorLink;   #empty unless it is appropriate to have an editor link.
 1103 
 1104   print CGI::end_div();
 1105 
 1106   # debugging stuff
 1107   if (0) {
 1108     print
 1109       CGI::hr(),
 1110       CGI::h2("debugging information"),
 1111       CGI::h3("form fields"),
 1112       ref2string($self->{formFields}),
 1113       CGI::h3("user object"),
 1114       ref2string($self->{user}),
 1115       CGI::h3("set object"),
 1116       ref2string($set),
 1117       CGI::h3("problem object"),
 1118       ref2string($problem),
 1119       CGI::h3("PG object"),
 1120       ref2string($pg, {'WeBWorK::PG::Translator' => 1});
 1121   }
 1122 
 1123   return "";
 1124 }
 1125 
 1126 1;

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