Diff of /trunk/webwork2/lib/WeBWorK/ContentGenerator/Problem.pm

Revision 717		Revision 4389
1	################################################################################	1	################################################################################
2	# WeBWorK mod_perl (c) 2000-2002 WeBWorK Project	2	# WeBWorK Online Homework Delivery System
3	# $Id$	3	# Copyright © 2000-2006 The WeBWorK Project, http://openwebwork.sf.net/
		4	# $CVSHeader: webwork2/lib/WeBWorK/ContentGenerator/Problem.pm,v 1.203 2006/07/12 01:23:54 gage 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.
4	################################################################################	15	################################################################################
5		16
6	package WeBWorK::ContentGenerator::Problem;	17	package WeBWorK::ContentGenerator::Problem;
		18	use base qw(WeBWorK::ContentGenerator);
7		19
8	=head1 NAME	20	=head1 NAME
9		21
10	WeBWorK::ContentGenerator::Problem - Allow a student to interact with a problem.	22	WeBWorK::ContentGenerator::Problem - Allow a student to interact with a problem.
11		23
12	=cut	24	=cut
13		25
14	use strict;	26	use strict;
15	use warnings;	27	use warnings;
16	use base qw(WeBWorK::ContentGenerator);	28	#use CGI qw(-nosticky );
17	use CGI qw();	29	use WeBWorK::CGI;
18	use File::Temp qw(tempdir);	30	use File::Path qw(rmtree);
		31	use WeBWorK::Debug;
19	use WeBWorK::Form;	32	use WeBWorK::Form;
20	use WeBWorK::PG;	33	use WeBWorK::PG;
		34	use WeBWorK::PG::ImageGenerator;
21	use WeBWorK::PG::IO;	35	use WeBWorK::PG::IO;
22	use WeBWorK::Utils qw(writeLog encodeAnswers decodeAnswers ref2string);	36	use WeBWorK::Utils qw(readFile writeLog writeCourseLog encodeAnswers decodeAnswers ref2string makeTempDirectory path_is_subdir sortByName);
		37	use WeBWorK::DB::Utils qw(global2user user2global findDefaults);
		38	use URI::Escape;
23		39
		40	use WeBWorK::Utils::Tasks qw(fake_set fake_problem);
		41
24	############################################################	42	################################################################################
		43	# CGI param interface to this module (up-to-date as of v1.153)
		44	################################################################################
		45
		46	# Standard params:
25	#	47	#
26	# user	48	# user - user ID of real user
27	# effectiveUser	49	# key - session key
28	# key	50	# effectiveUser - user ID of effective user
29	#	51	#
30	# displayMode	52	# Integration with PGProblemEditor:
31	# showOldAnswers
32	# showCorrectAnswers
33	# showHints
34	# showSolutions
35	#	53	#
36	# AnSwEr# - answer blanks in problem	54	# editMode - if set, indicates alternate problem source location.
		55	# can be "temporaryFile" or "savedFile".
37	#	56	#
		57	# sourceFilePath - path to file to be edited
		58	# problemSeed - force problem seed to value
		59	# success - success message to display
		60	# failure - failure message to display
		61	#
		62	# Rendering options:
		63	#
		64	# displayMode - name of display mode to use
		65	#
		66	# showOldAnswers - request that last entered answer be shown (if allowed)
		67	# showCorrectAnswers - request that correct answers be shown (if allowed)
		68	# showHints - request that hints be shown (if allowed)
		69	# showSolutions - request that solutions be shown (if allowed)
		70	#
		71	# Problem interaction:
		72	#
		73	# AnSwEr# - answer blanks in problem
		74	#
38	# redisplay - name of the "Redisplay Problem" button	75	# redisplay - name of the "Redisplay Problem" button
39	# submitAnswers - name of "Submit Answers" button	76	# submitAnswers - name of "Submit Answers" button
40	#	77	# checkAnswers - name of the "Check Answers" button
		78	# previewAnswers - name of the "Preview Answers" button
		79
41	############################################################	80	################################################################################
		81	# "can" methods
		82	################################################################################
		83
		84	# Subroutines to determine if a user "can" perform an action. Each subroutine is
		85	# called with the following arguments:
		86	#
		87	# ($self, $User, $EffectiveUser, $Set, $Problem)
		88
		89	# Note that significant parts of the "can" methods are lifted into the
		90	# GatewayQuiz module. It isn't direct, however, because of the necessity
		91	# of dealing with versioning there.
		92
		93	sub can_showOldAnswers {
		94	#my ($self, $User, $EffectiveUser, $Set, $Problem) = @_;
		95
		96	return 1;
		97	}
		98
		99	sub can_showCorrectAnswers {
		100	my ($self, $User, $EffectiveUser, $Set, $Problem) = @_;
		101	my $authz = $self->r->authz;
		102
		103	return
		104	after($Set->answer_date)
		105	\|\|
		106	$authz->hasPermissions($User->user_id, "show_correct_answers_before_answer_date")
		107	;
		108	}
		109
		110	sub can_showHints {
		111	#my ($self, $User, $EffectiveUser, $Set, $Problem) = @_;
		112
		113	return 1;
		114	}
		115
		116	sub can_showSolutions {
		117	my ($self, $User, $EffectiveUser, $Set, $Problem) = @_;
		118	my $authz = $self->r->authz;
		119
		120	return
		121	after($Set->answer_date)
		122	\|\|
		123	$authz->hasPermissions($User->user_id, "show_solutions_before_answer_date")
		124	;
		125	}
		126
		127	sub can_recordAnswers {
		128	my ($self, $User, $EffectiveUser, $Set, $Problem, $submitAnswers) = @_;
		129	my $authz = $self->r->authz;
		130	my $thisAttempt = $submitAnswers ? 1 : 0;
		131	if ($User->user_id ne $EffectiveUser->user_id) {
		132	return $authz->hasPermissions($User->user_id, "record_answers_when_acting_as_student");
		133	}
		134	if (before($Set->open_date)) {
		135	return $authz->hasPermissions($User->user_id, "record_answers_before_open_date");
		136	} elsif (between($Set->open_date, $Set->due_date)) {
		137	my $max_attempts = $Problem->max_attempts;
		138	my $attempts_used = $Problem->num_correct + $Problem->num_incorrect + $thisAttempt;
		139	if ($max_attempts == -1 or $attempts_used < $max_attempts) {
		140	return $authz->hasPermissions($User->user_id, "record_answers_after_open_date_with_attempts");
		141	} else {
		142	return $authz->hasPermissions($User->user_id, "record_answers_after_open_date_without_attempts");
		143	}
		144	} elsif (between($Set->due_date, $Set->answer_date)) {
		145	return $authz->hasPermissions($User->user_id, "record_answers_after_due_date");
		146	} elsif (after($Set->answer_date)) {
		147	return $authz->hasPermissions($User->user_id, "record_answers_after_answer_date");
		148	}
		149	}
		150
		151	sub can_checkAnswers {
		152	my ($self, $User, $EffectiveUser, $Set, $Problem, $submitAnswers) = @_;
		153	my $authz = $self->r->authz;
		154	my $thisAttempt = $submitAnswers ? 1 : 0;
		155
		156	if (before($Set->open_date)) {
		157	return $authz->hasPermissions($User->user_id, "check_answers_before_open_date");
		158	} elsif (between($Set->open_date, $Set->due_date)) {
		159	my $max_attempts = $Problem->max_attempts;
		160	my $attempts_used = $Problem->num_correct + $Problem->num_incorrect + $thisAttempt;
		161	if ($max_attempts == -1 or $attempts_used < $max_attempts) {
		162	return $authz->hasPermissions($User->user_id, "check_answers_after_open_date_with_attempts");
		163	} else {
		164	return $authz->hasPermissions($User->user_id, "check_answers_after_open_date_without_attempts");
		165	}
		166	} elsif (between($Set->due_date, $Set->answer_date)) {
		167	return $authz->hasPermissions($User->user_id, "check_answers_after_due_date");
		168	} elsif (after($Set->answer_date)) {
		169	return $authz->hasPermissions($User->user_id, "check_answers_after_answer_date");
		170	}
		171	}
		172
		173	# Helper functions for calculating times
		174	sub before { return time <= $_[0] }
		175	sub after { return time >= $_[0] }
		176	sub between { my $t = time; return $t > $_[0] && $t < $_[1] }
		177
		178	# Reset the default in some cases
		179	sub set_showOldAnswers_default {
		180	my ($self, $ce, $userName, $authz, $set) = @_;
		181	# these people always use the system/course default, so don't
		182	# override the value of ...->{showOldAnswers}
		183	return if $authz->hasPermissions($userName, "can_always_use_show_old_answers_default");
		184	# this person should always default to 0
		185	$ce->{pg}->{options}->{showOldAnswers} = 0
		186	unless ($authz->hasPermissions($userName, "can_show_old_answers_by_default"));
		187	# we are after the due date, so default to not showing it
		188	$ce->{pg}->{options}->{showOldAnswers} = 0 if $set->{due_date} && after($set->{due_date});
		189	}
		190
		191	################################################################################
		192	# output utilities
		193	################################################################################
		194
		195	# Note: the substance of attemptResults is lifted into GatewayQuiz.pm,
		196	# with some changes to the output format
		197
		198	sub attemptResults {
		199	my $self = shift;
		200	my $pg = shift;
		201	my $showAttemptAnswers = shift;
		202	my $showCorrectAnswers = shift;
		203	my $showAttemptResults = $showAttemptAnswers && shift;
		204	my $showSummary = shift;
		205	my $showAttemptPreview = shift \|\| 0;
		206
		207	my $ce = $self->r->ce;
		208
		209	my $problemResult = $pg->{result}; # the overall result of the problem
		210	my @answerNames = @{ $pg->{flags}->{ANSWER_ENTRY_ORDER} };
		211
		212	my $showMessages = $showAttemptAnswers && grep { $pg->{answers}->{$_}->{ans_message} } @answerNames;
		213
		214	my $basename = "equation-" . $self->{set}->psvn. "." . $self->{problem}->problem_id . "-preview";
		215
		216	# to make grabbing these options easier, we'll pull them out now...
		217	my %imagesModeOptions = %{$ce->{pg}->{displayModeOptions}->{images}};
		218
		219	my $imgGen = WeBWorK::PG::ImageGenerator->new(
		220	tempDir => $ce->{webworkDirs}->{tmp},
		221	latex => $ce->{externalPrograms}->{latex},
		222	dvipng => $ce->{externalPrograms}->{dvipng},
		223	useCache => 1,
		224	cacheDir => $ce->{webworkDirs}->{equationCache},
		225	cacheURL => $ce->{webworkURLs}->{equationCache},
		226	cacheDB => $ce->{webworkFiles}->{equationCacheDB},
		227	dvipng_align => $imagesModeOptions{dvipng_align},
		228	dvipng_depth_db => $imagesModeOptions{dvipng_depth_db},
		229	);
		230
		231	my $header;
		232	#$header .= CGI::th("Part");
		233	$header .= $showAttemptAnswers ? CGI::th("Entered") : "";
		234	$header .= $showAttemptPreview ? CGI::th("Answer Preview") : "";
		235	$header .= $showCorrectAnswers ? CGI::th("Correct") : "";
		236	$header .= $showAttemptResults ? CGI::th("Result") : "";
		237	$header .= $showMessages ? CGI::th("Messages") : "";
		238	my $fully = '';
		239	my @tableRows = ( $header );
		240	my $numCorrect = 0;
		241	my $numBlanks =0;
		242	my $tthPreambleCache;
		243	foreach my $name (@answerNames) {
		244	my $answerResult = $pg->{answers}->{$name};
		245	my $studentAnswer = $answerResult->{student_ans}; # original_student_ans
		246	my $preview = ($showAttemptPreview
		247	? $self->previewAnswer($answerResult, $imgGen, \$tthPreambleCache)
		248	: "");
		249	my $correctAnswer = $answerResult->{correct_ans};
		250	my $answerScore = $answerResult->{score};
		251	my $answerMessage = $showMessages ? $answerResult->{ans_message} : "";
		252	$answerMessage =~ s/\n/<BR>/g;
		253	$numCorrect += $answerScore >= 1;
		254	$numBlanks++ unless $studentAnswer =~/\S/ \|\| $answerScore >= 1; # unless student answer contains entry
		255	my $resultString = $answerScore >= 1 ? "correct" :
		256	$answerScore > 0 ? int($answerScore*100)."% correct" :
		257	"incorrect";
		258	$fully = 'completely ' if $answerScore >0 and $answerScore < 1;
		259
		260	# get rid of the goofy prefix on the answer names (supposedly, the format
		261	# of the answer names is changeable. this only fixes it for "AnSwEr"
		262	#$name =~ s/^AnSwEr//;
		263
		264	my $row;
		265	#$row .= CGI::td($name);
		266	$row .= $showAttemptAnswers ? CGI::td($self->nbsp($studentAnswer)) : "";
		267	$row .= $showAttemptPreview ? CGI::td($self->nbsp($preview)) : "";
		268	$row .= $showCorrectAnswers ? CGI::td($self->nbsp($correctAnswer)) : "";
		269	$row .= $showAttemptResults ? CGI::td($self->nbsp($resultString)) : "";
		270	$row .= $showMessages ? CGI::td({-class=>"Message"},$self->nbsp($answerMessage)) : "";
		271	push @tableRows, $row;
		272	}
		273
		274	# render equation images
		275	$imgGen->render(refresh => 1);
		276
		277	# my $numIncorrectNoun = scalar @answerNames == 1 ? "question" : "questions";
		278	my $scorePercent = sprintf("%.0f%%", $problemResult->{score} * 100);
		279	# FIXME -- I left the old code in in case we have to back out.
		280	# my $summary = "On this attempt, you answered $numCorrect out of "
		281	# . scalar @answerNames . " $numIncorrectNoun correct, for a score of $scorePercent.";
		282	my $summary = "";
		283	unless (defined($problemResult->{summary}) and $problemResult->{summary} =~ /\S/) {
		284	if (scalar @answerNames == 1) { #default messages
		285	if ($numCorrect == scalar @answerNames) {
		286	$summary .= CGI::div({class=>"ResultsWithoutError"},"The answer above is correct.");
		287	} else {
		288	$summary .= CGI::div({class=>"ResultsWithError"},"The answer above is NOT ${fully}correct.");
		289	}
		290	} else {
		291	if ($numCorrect == scalar @answerNames) {
		292	$summary .= CGI::div({class=>"ResultsWithoutError"},"All of the answers above are correct.");
		293	}
		294	unless ($numCorrect + $numBlanks == scalar( @answerNames)) {
		295	$summary .= CGI::div({class=>"ResultsWithError"},"At least one of the answers above is NOT ${fully}correct.");
		296	}
		297	if ($numBlanks) {
		298	my $s = ($numBlanks>1)?'':'s';
		299	$summary .= CGI::div({class=>"ResultsAlert"},"$numBlanks of the questions remain$s unanswered.");
		300	}
		301	}
		302	} else {
		303	$summary = $problemResult->{summary}; # summary has been defined by grader
		304	}
		305	return
		306	CGI::table({-class=>"attemptResults"}, CGI::Tr(\@tableRows))
		307	. ($showSummary ? CGI::p({class=>'attemptResultsSummary'},$summary) : "");
		308	}
		309
		310
		311	# Note: previewAnswer is lifted into GatewayQuiz.pm
		312
		313	sub previewAnswer {
		314	my ($self, $answerResult, $imgGen, $tthPreambleCache) = @_;
		315	my $ce = $self->r->ce;
		316	my $effectiveUser = $self->{effectiveUser};
		317	my $set = $self->{set};
		318	my $problem = $self->{problem};
		319	my $displayMode = $self->{displayMode};
		320
		321	# note: right now, we have to do things completely differently when we are
		322	# rendering math from INSIDE the translator and from OUTSIDE the translator.
		323	# so we'll just deal with each case explicitly here. there's some code
		324	# duplication that can be dealt with later by abstracting out tth/dvipng/etc.
		325
		326	my $tex = $answerResult->{preview_latex_string};
		327
		328	return "" unless defined $tex and $tex ne "";
		329
		330	if ($displayMode eq "plainText") {
		331	return $tex;
		332	} elsif ($displayMode eq "formattedText") {
		333
		334	# read the TTH preamble, or use the cached copy passed in from the caller
		335	my $tthPreamble='';
		336	if (defined $$tthPreambleCache) {
		337	$tthPreamble = $$tthPreambleCache;
		338	} else {
		339	my $tthPreambleFile = $ce->{courseDirs}->{templates} . "/tthPreamble.tex";
		340	if (-r $tthPreambleFile) {
		341	$tthPreamble = readFile($tthPreambleFile);
		342	# thanks to Jim Martino. each line in the definition file should end with
		343	#a % to prevent adding supurious paragraphs to output:
		344	$tthPreamble =~ s/(.)\n/$1%\n/g;
		345	# solves the problem if the file doesn't end with a return:
		346	$tthPreamble .="%\n";
		347	# store preamble in cache:
		348	$$tthPreambleCache = $tthPreamble;
		349	} else {
		350	}
		351	}
		352
		353	# construct TTH command line
		354	my $tthCommand = $ce->{externalPrograms}->{tth}
		355	. " -L -f5 -u -r 2> /dev/null <<END_OF_INPUT; echo > /dev/null\n"
		356	. $tthPreamble . "\\[" . $tex . "\\]\n"
		357	. "END_OF_INPUT\n";
		358
		359	# call tth
		360	my $result = `$tthCommand`;
		361	if ($?) {
		362	return "<b>[tth failed: $? $@]</b>";
		363	} else {
		364	# avoid border problems in tables and remove unneeded initial <br>
		365	$result =~ s/(<table [^>]*)>/$1 CLASS="ArrayLayout">/gi;
		366	$result =~ s!\s*<br clear="all" />!!;
		367	return $result;
		368	}
		369
		370	} elsif ($displayMode eq "images") {
		371	$imgGen->add($tex);
		372	} elsif ($displayMode eq "jsMath") {
		373	$tex =~ s/</</g; $tex =~ s/>/>/g;
		374	return '<SPAN CLASS="math">\\displaystyle{'.$tex.'}</SPAN>';
		375	}
		376	}
		377
		378	################################################################################
		379	# Template escape implementations
		380	################################################################################
42		381
43	sub pre_header_initialize {	382	sub pre_header_initialize {
44	my ($self, $setName, $problemNumber) = @_;	383	my ($self) = @_;
45	my $courseEnv = $self->{courseEnvironment};
46	my $r = $self->{r};	384	my $r = $self->r;
		385	my $ce = $r->ce;
		386	my $db = $r->db;
		387	my $authz = $r->authz;
		388	my $urlpath = $r->urlpath;
		389
		390	my $setName = $urlpath->arg("setID");
		391	my $problemNumber = $r->urlpath->arg("problemID");
47	my $userName = $r->param('user');	392	my $userName = $r->param('user');
48	my $effectiveUserName = $r->param('effectiveUser');	393	my $effectiveUserName = $r->param('effectiveUser');
		394	my $key = $r->param('key');
		395	my $editMode = $r->param("editMode");
49		396
50	##### database setup #####
51
52	my $cldb = WeBWorK::DB::Classlist->new($courseEnv);
53	my $wwdb = WeBWorK::DB::WW->new($courseEnv);
54	my $authdb = WeBWorK::DB::Auth->new($courseEnv);
55
56	my $user = $cldb->getUser($userName);	397	my $user = $db->getUser($userName); # checked
		398	die "record for user $userName (real user) does not exist."
		399	unless defined $user;
		400
57	my $effectiveUser = $cldb->getUser($effectiveUserName);	401	my $effectiveUser = $db->getUser($effectiveUserName); # checked
		402	die "record for user $effectiveUserName (effective user) does not exist."
		403	unless defined $effectiveUser;
		404
		405	# obtain the merged set for $effectiveUser
		406	my $set = $db->getMergedSet($effectiveUserName, $setName); # checked
		407
		408	$self->set_showOldAnswers_default($ce, $userName, $authz, $set);
		409
		410	# gateway check here: we want to be sure that someone isn't trying to take
		411	# a GatewayQuiz through the regular problem/homework mechanism, thereby
		412	# circumventing the versioning, time limits, etc.
		413	if (defined $set and defined $set->assignment_type and $set->assignment_type() =~ /gateway/) {
		414	unless ($editMode eq "temporaryFile" and $authz->hasPermissions($userName, "modify_student_data")) {
		415	die('Invalid access attempt: the Problem ContentGenerator was called for a GatewayQuiz assignment.' );
		416	}
		417	}
		418
		419	# Database fix (in case of undefined published values)
		420	# this is only necessary because some people keep holding to ww1.9 which did not have a published field
		421	# make sure published is set to 0 or 1
		422	if ( $set and $set->published ne "0" and $set->published ne "1") {
		423	my $globalSet = $db->getGlobalSet($set->set_id);
		424	$globalSet->published("1"); # defaults to published
		425	$db->putGlobalSet($globalSet);
58	my $set = $wwdb->getSet($effectiveUserName, $setName);	426	$set = $db->getMergedSet($effectiveUserName, $setName);
		427	} else {
		428	# don't do anything just yet, maybe we're a professor and we're
		429	# fabricating a set or haven't assigned it to ourselves just yet
		430	}
		431
		432	# obtain the merged problem for $effectiveUser
59	my $problem = $wwdb->getProblem($effectiveUserName, $setName, $problemNumber);	433	my $problem = $db->getMergedProblem($effectiveUserName, $setName, $problemNumber); # checked
60	my $psvn = $wwdb->getPSVN($effectiveUserName, $setName);	434
61	my $permissionLevel = $authdb->getPermissions($userName);	435	if ($authz->hasPermissions($userName, "modify_problem_sets")) {
		436	# professors are allowed to fabricate sets and problems not
		437	# assigned to them (or anyone). this allows them to use the
		438	# editor to
		439
		440	# if a User Set does not exist for this user and this set
		441	# then we check the Global Set
		442	# if that does not exist we create a fake set
		443	# if it does, we add fake user data
		444	unless (defined $set) {
		445	my $userSetClass = $db->{set_user}->{record};
		446	my $globalSet = $db->getGlobalSet($setName); # checked
		447
		448	if (not defined $globalSet) {
		449	$set = fake_set($db);
		450	} else {
		451	$set = global2user($userSetClass, $globalSet);
		452	$set->psvn(0);
		453	}
		454	}
		455
		456	# if that is not yet defined obtain the global problem,
		457	# convert it to a user problem, and add fake user data
		458	unless (defined $problem) {
		459	my $userProblemClass = $db->{problem_user}->{record};
		460	my $globalProblem = $db->getGlobalProblem($setName, $problemNumber); # checked
		461	# if the global problem doesn't exist either, bail!
		462	if(not defined $globalProblem) {
		463	my $sourceFilePath = $r->param("sourceFilePath");
		464	die "sourceFilePath is unsafe!" unless path_is_subdir($sourceFilePath, $ce->{courseDirs}->{templates}, 1); # 1==path can be relative to dir
		465	# These are problems from setmaker. If declared invalid, they won't come up
		466	$self->{invalidProblem} = $self->{invalidSet} = 1 unless defined $sourceFilePath;
		467	# die "Problem $problemNumber in set $setName does not exist" unless defined $sourceFilePath;
		468	$problem = fake_problem($db);
		469	$problem->problem_id(1);
		470	$problem->source_file($sourceFilePath);
		471	$problem->user_id($effectiveUserName);
		472	} else {
		473	$problem = global2user($userProblemClass, $globalProblem);
		474	$problem->user_id($effectiveUserName);
		475	$problem->problem_seed(0);
		476	$problem->status(0);
		477	$problem->attempted(0);
		478	$problem->last_answer("");
		479	$problem->num_correct(0);
		480	$problem->num_incorrect(0);
		481	}
		482	}
		483
		484	# now we're sure we have valid UserSet and UserProblem objects
		485	# yay!
		486
		487	# now deal with possible editor overrides:
		488
		489	# if the caller is asking to override the source file, and
		490	# editMode calls for a temporary file, do so
		491	my $sourceFilePath = $r->param("sourceFilePath");
		492	if (defined $editMode and $editMode eq "temporaryFile" and defined $sourceFilePath) {
		493	die "sourceFilePath is unsafe!" unless path_is_subdir($sourceFilePath, $ce->{courseDirs}->{templates}, 1); # 1==path can be relative to dir
		494	$problem->source_file($sourceFilePath);
		495	}
		496
		497	# if the problem does not have a source file or no source file has been passed in
		498	# then this is really an invalid problem (probably from a bad URL)
		499	$self->{invalidProblem} = not (defined $sourceFilePath or $problem->source_file);
		500
		501	# if the caller is asking to override the problem seed, do so
		502	my $problemSeed = $r->param("problemSeed");
		503	if (defined $problemSeed) {
		504	$problem->problem_seed($problemSeed);
		505	}
		506
		507	my $publishedClass = ($set->published) ? "Published" : "Unpublished";
		508	my $publishedText = ($set->published) ? "visible to students." : "hidden from students.";
		509	$self->addmessage(CGI::p("This set is " . CGI::font({class=>$publishedClass}, $publishedText)));
		510
		511	# test for additional set validity if it's not already invalid
		512	} else {
		513	# A set is valid if it exists and if it is either published or the user is privileged.
		514	$self->{invalidSet} = !(defined $set and ($set->published \|\| $authz->hasPermissions($userName, "view_unpublished_sets")));
		515	$self->{invalidProblem} = !(defined $problem and ($set->published \|\| $authz->hasPermissions($userName, "view_unpublished_sets")));
		516
		517	$self->addbadmessage(CGI::p("This problem will not count towards your grade.")) if $problem and not $problem->value and not $self->{invalidProblem};
		518	}
		519
		520	$self->{userName} = $userName;
		521	$self->{effectiveUserName} = $effectiveUserName;
		522	$self->{user} = $user;
		523	$self->{effectiveUser} = $effectiveUser;
		524	$self->{set} = $set;
		525	$self->{problem} = $problem;
		526	$self->{editMode} = $editMode;
62		527
63	##### form processing #####	528	##### form processing #####
64		529
65	# set options from form fields (see comment at top of file for names)	530	# set options from form fields (see comment at top of file for names)
66	my $displayMode = $r->param("displayMode") \|\| $courseEnv->{pg}->{options}->{displayMode};	531	my $displayMode = $r->param("displayMode") \|\| $ce->{pg}->{options}->{displayMode};
67	my $redisplay = $r->param("redisplay");	532	my $redisplay = $r->param("redisplay");
68	my $submitAnswers = $r->param("submitAnswers");	533	my $submitAnswers = $r->param("submitAnswers");
		534	my $checkAnswers = $r->param("checkAnswers");
69	my $previewAnswers = $r->param("previewAnswers");	535	my $previewAnswers = $r->param("previewAnswers");
70		536
71	# coerce form fields into CGI::Vars format
72	my $formFields = { WeBWorK::Form->new_from_paramable($r)->Vars };	537	my $formFields = { WeBWorK::Form->new_from_paramable($r)->Vars };
73		538
		539	$self->{displayMode} = $displayMode;
		540	$self->{redisplay} = $redisplay;
		541	$self->{submitAnswers} = $submitAnswers;
		542	$self->{checkAnswers} = $checkAnswers;
		543	$self->{previewAnswers} = $previewAnswers;
		544	$self->{formFields} = $formFields;
		545
		546	# get result and send to message
		547	my $status_message = $r->param("status_message");
		548	$self->addmessage(CGI::p("$status_message")) if $status_message;
		549
		550	# now that we've set all the necessary variables quit out if the set or problem is invalid
		551	return if $self->{invalidSet} \|\| $self->{invalidProblem};
		552
74	##### permissions #####	553	##### permissions #####
75		554
		555	# are we allowed to view this problem?
		556	$self->{isOpen} = after($set->open_date) \|\| $authz->hasPermissions($userName, "view_unopened_sets");
		557	return unless $self->{isOpen};
		558
76	# what does the user want to do?	559	# what does the user want to do?
		560	#FIXME There is a problem with checkboxes -- if they are not checked they are invisible. Hence if the default mode in $ce is 1
		561	# there is no way to override this. Probably this is ok for the last three options, but it was definitely not ok for showing
		562	# saved answers which is normally on, but you want to be able to turn it off! This section should be moved to ContentGenerator
		563	# so that you can set these options anywhere. We also need mechanisms for making them sticky.
		564	# Note: ProblemSet and ProblemSets might set showOldAnswers to '', which
		565	# needs to be treated as if it is not set.
77	my %want = (	566	my %want = (
78	showOldAnswers => $r->param("showOldAnswers") \|\| $courseEnv->{pg}->{options}->{showOldAnswers},	567	showOldAnswers => (defined($r->param("showOldAnswers")) and $r->param("showOldAnswers") ne '') ? $r->param("showOldAnswers") : $ce->{pg}->{options}->{showOldAnswers},
79	showCorrectAnswers => $r->param("showCorrectAnswers") \|\| $courseEnv->{pg}->{options}->{showCorrectAnswers},	568	showCorrectAnswers => $r->param("showCorrectAnswers") \|\| $ce->{pg}->{options}->{showCorrectAnswers},
80	showHints => $r->param("showHints") \|\| $courseEnv->{pg}->{options}->{showHints},	569	showHints => $r->param("showHints") \|\| $ce->{pg}->{options}->{showHints},
81	showSolutions => $r->param("showSolutions") \|\| $courseEnv->{pg}->{options}->{showSolutions},	570	showSolutions => $r->param("showSolutions") \|\| $ce->{pg}->{options}->{showSolutions},
82	recordAnswers => $r->param("recordAnswers") \|\| 1,	571	recordAnswers => $submitAnswers,
		572	checkAnswers => $checkAnswers,
		573	getSubmitButton => 1,
83	);	574	);
84		575
85	# are certain options enforced?	576	# are certain options enforced?
86	my %must = (	577	my %must = (
87	showOldAnswers => 0,	578	showOldAnswers => 0,
88	showCorrectAnswers => 0,	579	showCorrectAnswers => 0,
89	showHints => 0,	580	showHints => 0,
90	showSolutions => 0,	581	showSolutions => 0,
91	recordAnswers => mustRecordAnswers($permissionLevel),	582	recordAnswers => ! $authz->hasPermissions($userName, "avoid_recording_answers"),
		583	checkAnswers => 0,
		584	getSubmitButton => 0,
92	);	585	);
93		586
94	# does the user have permission to use certain options?	587	# does the user have permission to use certain options?
		588	my @args = ($user, $effectiveUser, $set, $problem);
95	my %can = (	589	my %can = (
96	showOldAnswers => 1,	590	showOldAnswers => $self->can_showOldAnswers(@args),
97	showCorrectAnswers => canShowCorrectAnswers($permissionLevel, $set->answer_date),	591	showCorrectAnswers => $self->can_showCorrectAnswers(@args),
98	showHints => 1,	592	showHints => $self->can_showHints(@args),
99	showSolutions => canShowSolutions($permissionLevel, $set->answer_date),	593	showSolutions => $self->can_showSolutions(@args),
100	recordAnswers => canRecordAnswers($permissionLevel, $set->open_date, $set->due_date,	594	recordAnswers => $self->can_recordAnswers(@args, 0),
101	$problem->max_attempts, $problem->num_correct + $problem->num_incorrect + 1),	595	checkAnswers => $self->can_checkAnswers(@args, $submitAnswers),
102	# num_correct+num_incorrect+1 -- as this happens before updating $problem	596	getSubmitButton => $self->can_recordAnswers(@args, $submitAnswers),
103	);	597	);
104		598
105	# final values for options	599	# final values for options
106	my %will;	600	my %will;
107	foreach (keys %must) {	601	foreach (keys %must) {
108	$will{$_} = $can{$_} && ($want{$_} \|\| $must{$_});	602	$will{$_} = $can{$_} && ($want{$_} \|\| $must{$_});
109	}	603	}
110		604
111	##### sticky answers #####	605	##### sticky answers #####
112		606
113	if (not $submitAnswers and $will{showOldAnswers}) {	607	if (not ($submitAnswers or $previewAnswers or $checkAnswers) and $will{showOldAnswers}) {
114	# do this only if new answers are NOT being submitted	608	# do this only if new answers are NOT being submitted
115	my %oldAnswers = decodeAnswers($problem->last_answer);	609	my %oldAnswers = decodeAnswers($problem->last_answer);
116	$formFields->{$_} = $oldAnswers{$_} foreach keys %oldAnswers;	610	$formFields->{$_} = $oldAnswers{$_} foreach keys %oldAnswers;
117	}	611	}
118		612
119	##### translation #####	613	##### translation #####
120		614
		615	debug("begin pg processing");
121	my $pg = WeBWorK::PG->new(	616	my $pg = WeBWorK::PG->new(
122	$courseEnv,	617	$ce,
123	$effectiveUser,	618	$effectiveUser,
124	$r->param('key'),	619	$key,
125	$set,	620	$set,
126	$problem,	621	$problem,
127	$psvn,	622	$set->psvn, # FIXME: this field should be removed
128	$formFields,	623	$formFields,
129	{ # translation options	624	{ # translation options
130	displayMode => $displayMode,	625	displayMode => $displayMode,
131	showHints => $will{showHints},	626	showHints => $will{showHints},
132	showSolutions => $will{showSolutions},	627	showSolutions => $will{showSolutions},
133	refreshMath2img => $will{showHints} \|\| $will{showSolutions},	628	refreshMath2img => $will{showHints} \|\| $will{showSolutions},
134	processAnswers => 1,	629	processAnswers => 1,
135	},	630	},
136	);	631	);
137		632
		633	debug("end pg processing");
		634
138	##### fix hint/solution options #####	635	##### fix hint/solution options #####
139		636
140	$can{showHints} &&= $pg->{flags}->{hintExists};	637	$can{showHints} &&= $pg->{flags}->{hintExists}
		638	&&= $pg->{flags}->{showHintLimit}<=$pg->{state}->{num_of_incorrect_ans};
141	$can{showSolutions} &&= $pg->{flags}->{solutionExists};	639	$can{showSolutions} &&= $pg->{flags}->{solutionExists};
142		640
143	##### store fields #####	641	##### store fields #####
144
145	$self->{cldb} = $cldb;
146	$self->{wwdb} = $wwdb;
147	$self->{authdb} = $authdb;
148
149	$self->{userName} = $userName;
150	$self->{user} = $user;
151	$self->{effectiveUser} = $effectiveUser;
152	$self->{set} = $set;
153	$self->{problem} = $problem;
154	$self->{permissionLevel} = $permissionLevel;
155
156	$self->{displayMode} = $displayMode;
157	$self->{redisplay} = $redisplay;
158	$self->{submitAnswers} = $submitAnswers;
159	$self->{previewAnswers} = $previewAnswers;
160	$self->{formFields} = $formFields;
161		642
162	$self->{want} = \%want;	643	$self->{want} = \%want;
163	$self->{must} = \%must;	644	$self->{must} = \%must;
164	$self->{can} = \%can;	645	$self->{can} = \%can;
165	$self->{will} = \%will;	646	$self->{will} = \%will;
166
167	$self->{pg} = $pg;	647	$self->{pg} = $pg;
168	}
169
170	sub if_warnings($$) {
171	my ($self, $arg) = @_;
172	return $self->{pg}->{warnings} ne "";
173	}	648	}
174		649
175	sub if_errors($$) {	650	sub if_errors($$) {
176	my ($self, $arg) = @_;	651	my ($self, $arg) = @_;
		652
		653	if ($self->{isOpen}) {
177	return $self->{pg}->{flags}->{error_flag};	654	return $self->{pg}->{flags}->{error_flag} ? $arg : !$arg;
		655	} else {
		656	return !$arg;
		657	}
178	}	658	}
179		659
180	sub head {	660	sub head {
181	my $self = shift;	661	my ($self) = @_;
182		662
		663	return "" unless $self->{isOpen};
183	return $self->{pg}->{head_text} if $self->{pg}->{head_text};	664	return $self->{pg}->{head_text} if $self->{pg}->{head_text};
184	}	665	}
185		666
186	sub path {	667	sub options {
187	my $self = shift;	668	my ($self) = @_;
188	my $args = $_[-1];	669	#warn "doing options in Problem";
189	my $setName = $self->{set}->id;
190	my $problemNumber = $self->{problem}->id;
191		670
192	my $ce = $self->{courseEnvironment};	671	# don't show options if we don't have anything to show
193	my $root = $ce->{webworkURLs}->{root};	672	return "" if $self->{invalidSet} or $self->{invalidProblem};
194	my $courseName = $ce->{courseName};	673	return "" unless $self->{isOpen};
		674
		675	my $displayMode = $self->{displayMode};
		676	my %can = %{ $self->{can} };
		677
		678	my @options_to_show = "displayMode";
		679	push @options_to_show, "showOldAnswers" if $can{showOldAnswers};
		680	push @options_to_show, "showHints" if $can{showHints};
		681	push @options_to_show, "showSolutions" if $can{showSolutions};
		682
195	return $self->pathMacro($args,	683	return $self->optionsMacro(
196	"Home" => "$root",	684	options_to_show => \@options_to_show,
197	$courseName => "$root/$courseName",	685	extra_params => ["editMode", "sourceFilePath"],
198	$setName => "$root/$courseName/$setName",
199	"Problem $problemNumber" => "",
200	);	686	);
201	}	687	}
202		688
203	sub siblings {	689	sub siblings {
204	my $self = shift;	690	my ($self) = @_;
		691	my $r = $self->r;
		692	my $db = $r->db;
		693	my $urlpath = $r->urlpath;
		694
		695	# can't show sibling problems if the set is invalid
		696	return "" if $self->{invalidSet};
		697
		698	my $courseID = $urlpath->arg("courseID");
205	my $setName = $self->{set}->id;	699	my $setID = $self->{set}->set_id;
206	my $problemNumber = $self->{problem}->id;
207
208	my $ce = $self->{courseEnvironment};
209	my $root = $ce->{webworkURLs}->{root};
210	my $courseName = $ce->{courseName};
211
212	print CGI::strong("Problems"), CGI::br();
213
214	my $wwdb = $self->{wwdb};
215	my $effectiveUser = $self->{r}->param("effectiveUser");	700	my $eUserID = $r->param("effectiveUser");
216	my @problems;	701	my @problemIDs = sort { $a <=> $b } $db->listUserProblems($eUserID, $setID);
217	push @problems, $wwdb->getProblem($effectiveUser, $setName, $_)	702
218	foreach ($wwdb->getProblems($effectiveUser, $setName));	703	print CGI::start_div({class=>"info-box", id=>"fisheye"});
219	foreach my $problem (sort { $a->id <=> $b->id } @problems) {	704	print CGI::h2("Problems");
220	print CGI::a({-href=>"$root/$courseName/$setName/".$problem->id."/?"	705	#print CGI::start_ul({class=>"LinksMenu"});
221	. $self->url_authen_args . "&displayMode=" . $self->{displayMode}},	706	#print CGI::start_li();
222	"Problem ".$problem->id), CGI::br();	707	#print CGI::span({style=>"font-size:larger"}, "Problems");
		708	print CGI::start_ul();
		709
		710	foreach my $problemID (@problemIDs) {
		711	my $problemPage = $urlpath->newFromModule("WeBWorK::ContentGenerator::Problem",
		712	courseID => $courseID, setID => $setID, problemID => $problemID);
		713	print CGI::li(CGI::a( {href=>$self->systemLink($problemPage,
		714	params=>{ displayMode => $self->{displayMode},
		715	showOldAnswers => $self->{will}->{showOldAnswers}
		716	})}, "Problem $problemID")
		717	);
223	}	718	}
		719
		720	print CGI::end_ul();
		721	#print CGI::end_li();
		722	#print CGI::end_ul();
		723	print CGI::end_div();
		724
		725	return "";
224	}	726	}
225		727
226	sub nav {	728	sub nav {
227	my $self = shift;	729	my ($self, $args) = @_;
228	my $args = $_[-1];	730	my $r = $self->r;
229	my $setName = $self->{set}->id;	731	my $db = $r->db;
230	my $problemNumber = $self->{problem}->id;	732	my $urlpath = $r->urlpath;
231		733
232	my $ce = $self->{courseEnvironment};	734	my $courseID = $urlpath->arg("courseID");
233	my $root = $ce->{webworkURLs}->{root};	735	my $setID = $self->{set}->set_id if !($self->{invalidSet});
234	my $courseName = $ce->{courseName};	736	my $problemID = $self->{problem}->problem_id if !($self->{invalidProblem});
235
236	my $wwdb = $self->{wwdb};
237	my $effectiveUser = $self->{r}->param("effectiveUser");	737	my $eUserID = $r->param("effectiveUser");
238	my $tail = "&displayMode=".$self->{displayMode};
239		738
240	my @links = ("Problem List" => "$root/$courseName/$setName");	739	my ($prevID, $nextID);
		740
		741	if (!$self->{invalidProblem}) {
		742	my @problemIDs = $db->listUserProblems($eUserID, $setID);
		743	foreach my $id (@problemIDs) {
		744	$prevID = $id if $id < $problemID
		745	and (not defined $prevID or $id > $prevID);
		746	$nextID = $id if $id > $problemID
		747	and (not defined $nextID or $id < $nextID);
		748	}
		749	}
241		750
242	my $prevProblem = $wwdb->getProblem($effectiveUser, $setName, $problemNumber-1);	751	my @links;
243	my $nextProblem = $wwdb->getProblem($effectiveUser, $setName, $problemNumber+1);
244	unshift @links, "Previous Problem" => $prevProblem
245	? "$root/$courseName/$setName/".$prevProblem->id
246	: "";
247	push @links, "Next Problem" => $nextProblem
248	? "$root/$courseName/$setName/".$nextProblem->id
249	: "";
250		752
		753	if ($prevID) {
		754	my $prevPage = $urlpath->newFromModule(__PACKAGE__,
		755	courseID => $courseID, setID => $setID, problemID => $prevID);
		756	push @links, "Previous Problem", $r->location . $prevPage->path, "navPrev";
		757	} else {
		758	push @links, "Previous Problem", "", "navPrev";
		759	}
		760
		761	push @links, "Problem List", $r->location . $urlpath->parent->path, "navProbList";
		762
		763	if ($nextID) {
		764	my $nextPage = $urlpath->newFromModule(__PACKAGE__,
		765	courseID => $courseID, setID => $setID, problemID => $nextID);
		766	push @links, "Next Problem", $r->location . $nextPage->path, "navNext";
		767	} else {
		768	push @links, "Next Problem", "", "navNext";
		769	}
		770
		771	my $tail = "";
		772
		773	$tail .= "&displayMode=".$self->{displayMode} if defined $self->{displayMode};
		774	$tail .= "&showOldAnswers=".$self->{will}->{showOldAnswers}
		775	if defined $self->{will}->{showOldAnswers};
251	return $self->navMacro($args, $tail, @links);	776	return $self->navMacro($args, $tail, @links);
252	}	777	}
253		778
254	sub title {	779	sub title {
255	my $self = shift;	780	my ($self) = @_;
256	my $setName = $self->{set}->id;	781
257	my $problemNumber = $self->{problem}->id;	782	# using the url arguments won't break if the set/problem are invalid
		783	my $setID = WeBWorK::ContentGenerator::underscore2nbsp($self->r->urlpath->arg("setID"));
		784	my $problemID = $self->r->urlpath->arg("problemID");
258		785
259	return "$setName : Problem $problemNumber";	786	return "$setID: Problem $problemID";
260	}	787	}
261		788
262	sub body {	789	sub body {
263	my $self = shift;	790	my $self = shift;
		791	my $r = $self->r;
		792	my $ce = $r->ce;
		793	my $db = $r->db;
		794	my $authz = $r->authz;
		795	my $urlpath = $r->urlpath;
		796	my $user = $r->param('user');
		797	my $effectiveUser = $r->param('effectiveUser');
		798
		799	if ($self->{invalidSet}) {
		800	return CGI::div({class=>"ResultsWithError"},
		801	CGI::p("The selected homework set (" . $urlpath->arg("setID") . ") is not a valid set for " . $r->param("effectiveUser") . "."));
		802	}
264		803
		804	if ($self->{invalidProblem}) {
		805	return CGI::div({class=>"ResultsWithError"},
		806	CGI::p("The selected problem (" . $urlpath->arg("problemID") . ") is not a valid problem for set " . $self->{set}->set_id . "."));
		807	}
		808
		809	unless ($self->{isOpen}) {
		810	return CGI::div({class=>"ResultsWithError"},
		811	CGI::p("This problem is not available because the homework set that contains it is not yet open."));
		812	}
265	# unpack some useful variables	813	# unpack some useful variables
266	my $r = $self->{r};
267	my $wwdb = $self->{wwdb};
268	my $set = $self->{set};	814	my $set = $self->{set};
269	my $problem = $self->{problem};	815	my $problem = $self->{problem};
270	my $permissionLevel = $self->{permissionLevel};	816	my $editMode = $self->{editMode};
271	my $submitAnswers = $self->{submitAnswers};	817	my $submitAnswers = $self->{submitAnswers};
		818	my $checkAnswers = $self->{checkAnswers};
272	my $previewAnswers = $self->{previewAnswers};	819	my $previewAnswers = $self->{previewAnswers};
		820	my %want = %{ $self->{want} };
		821	my %can = %{ $self->{can} };
		822	my %must = %{ $self->{must} };
273	my %will = %{ $self->{will} };	823	my %will = %{ $self->{will} };
274	my $pg = $self->{pg};	824	my $pg = $self->{pg};
275		825
		826	my $courseName = $urlpath->arg("courseID");
		827
		828	# FIXME: move editor link to top, next to problem number.
		829	# format as "[edit]" like we're doing with course info file, etc.
		830	# add edit link for set as well.
		831	my $editorLink = "";
		832	# if we are here without a real homework set, carry that through
		833	my $forced_field = [];
		834	$forced_field = ['sourceFilePath' => $r->param("sourceFilePath")] if
		835	($set->set_id eq 'Undefined_Set');
		836	if ($authz->hasPermissions($user, "modify_problem_sets")) {
		837	my $editorPage = $urlpath->newFromModule("WeBWorK::ContentGenerator::Instructor::PGProblemEditor",
		838	courseID => $courseName, setID => $set->set_id, problemID => $problem->problem_id);
		839	my $editorURL = $self->systemLink($editorPage, params=>$forced_field);
		840	$editorLink = CGI::p(CGI::a({href=>$editorURL,target =>'WW_Editor'}, "Edit this problem"));
		841	}
		842
276	##### translation errors? #####	843	##### translation errors? #####
277		844
278	if ($pg->{flags}->{error_flag}) {	845	if ($pg->{flags}->{error_flag}) {
279	return translationError($pg->{errors}, $pg->{body_text});	846	if ($authz->hasPermissions($user, "view_problem_debugging_info")) {
		847	print $self->errorOutput($pg->{errors}, $pg->{body_text});
		848	} else {
		849	print $self->errorOutput($pg->{errors}, "You do not have permission to view the details of this error.");
		850	}
		851	print $editorLink;
		852	return "";
280	}	853	}
281		854
282	##### answer processing #####	855	##### answer processing #####
283		856	debug("begin answer processing");
284	# if answers were submitted:	857	# if answers were submitted:
		858	my $scoreRecordedMessage;
		859	my $pureProblem;
285	if ($submitAnswers) {	860	if ($submitAnswers) {
		861	# get a "pure" (unmerged) UserProblem to modify
		862	# this will be undefined if the problem has not been assigned to this user
		863	$pureProblem = $db->getUserProblem($problem->user_id, $problem->set_id, $problem->problem_id); # checked
		864	if (defined $pureProblem) {
286	# store answers in DB for sticky answers	865	# store answers in DB for sticky answers
287	my %answersToStore;	866	my %answersToStore;
288	my %answerHash = %{ $pg->{answers} };	867	my %answerHash = %{ $pg->{answers} };
289	$answersToStore{$_} = $answerHash{$_}->{original_student_ans}	868	$answersToStore{$_} = $self->{formFields}->{$_} #$answerHash{$_}->{original_student_ans} -- this may have been modified for fields with multiple values. Don't use it!!
290	foreach (keys %answerHash);	869	foreach (keys %answerHash);
		870
		871	# There may be some more answers to store -- one which are auxiliary entries to a primary answer. Evaluating
		872	# matrices works in this way, only the first answer triggers an answer evaluator, the rest are just inputs
		873	# however we need to store them. Fortunately they are still in the input form.
		874	my @extra_answer_names = @{ $pg->{flags}->{KEPT_EXTRA_ANSWERS}};
		875	$answersToStore{$_} = $self->{formFields}->{$_} foreach (@extra_answer_names);
		876
		877	# Now let's encode these answers to store them -- append the extra answers to the end of answer entry order
		878	my @answer_order = (@{$pg->{flags}->{ANSWER_ENTRY_ORDER}}, @extra_answer_names);
291	my $answerString = encodeAnswers(%answersToStore,	879	my $answerString = encodeAnswers(%answersToStore,
292	@{ $pg->{flags}->{ANSWER_ENTRY_ORDER} });	880	@answer_order);
		881
		882	# store last answer to database
293	$problem->last_answer($answerString);	883	$problem->last_answer($answerString);
		884	$pureProblem->last_answer($answerString);
294	$wwdb->setProblem($problem);	885	$db->putUserProblem($pureProblem);
295		886
296	# store state in DB if it makes sense	887	# store state in DB if it makes sense
297	if ($will{recordAnswers}) {	888	if ($will{recordAnswers}) {
298	$problem->attempted(1);
299	$problem->status($pg->{state}->{recorded_score});	889	$problem->status($pg->{state}->{recorded_score});
		890	$problem->attempted(1);
300	$problem->num_correct($pg->{state}->{num_of_correct_ans});	891	$problem->num_correct($pg->{state}->{num_of_correct_ans});
301	$problem->num_incorrect($pg->{state}->{num_of_incorrect_ans});	892	$problem->num_incorrect($pg->{state}->{num_of_incorrect_ans});
302	$wwdb->setProblem($problem);	893	$pureProblem->status($pg->{state}->{recorded_score});
		894	$pureProblem->attempted(1);
		895	$pureProblem->num_correct($pg->{state}->{num_of_correct_ans});
		896	$pureProblem->num_incorrect($pg->{state}->{num_of_incorrect_ans});
		897	if ($db->putUserProblem($pureProblem)) {
		898	$scoreRecordedMessage = "Your score was recorded.";
		899	} else {
		900	$scoreRecordedMessage = "Your score was not recorded because there was a failure in storing the problem record to the database.";
		901	}
303	# write to the transaction log, just to make sure	902	# write to the transaction log, just to make sure
304	writeLog($self->{courseEnvironment}, "transaction",	903	writeLog($self->{ce}, "transaction",
305	$problem->id."\t".	904	$problem->problem_id."\t".
306	$problem->set_id."\t".	905	$problem->set_id."\t".
307	$problem->login_id."\t".	906	$problem->user_id."\t".
308	$problem->source_file."\t".	907	$problem->source_file."\t".
309	$problem->value."\t".	908	$problem->value."\t".
310	$problem->max_attempts."\t".	909	$problem->max_attempts."\t".
311	$problem->problem_seed."\t".	910	$problem->problem_seed."\t".
312	$problem->status."\t".	911	$pureProblem->status."\t".
313	$problem->attempted."\t".	912	$pureProblem->attempted."\t".
314	$problem->last_answer."\t".	913	$pureProblem->last_answer."\t".
315	$problem->num_correct."\t".	914	$pureProblem->num_correct."\t".
316	$problem->num_incorrect	915	$pureProblem->num_incorrect
		916	);
		917	} else {
		918	if (before($set->open_date) or after($set->due_date)) {
		919	$scoreRecordedMessage = "Your score was not recorded because this homework set is closed.";
		920	} else {
		921	$scoreRecordedMessage = "Your score was not recorded.";
		922	}
		923	}
		924	} else {
		925	$scoreRecordedMessage = "Your score was not recorded because this problem has not been assigned to you.";
		926	}
		927	}
		928
		929	# logging student answers
		930
		931	my $answer_log = $self->{ce}->{courseFiles}->{logs}->{'answer_log'};
		932	if ( defined($answer_log ) and defined($pureProblem)) {
		933	if ($submitAnswers && !$authz->hasPermissions($effectiveUser, "dont_log_past_answers")) {
		934	my $answerString = ""; my $scores = "";
		935	my %answerHash = %{ $pg->{answers} };
		936	# FIXME this is the line 552 error. make sure original student ans is defined.
		937	# The fact that it is not defined is probably due to an error in some answer evaluator.
		938	# But I think it is useful to suppress this error message in the log.
		939	foreach (sortByName(undef, keys %answerHash)) {
		940	my $orig_ans = $answerHash{$_}->{original_student_ans};
		941	my $student_ans = defined $orig_ans ? $orig_ans : '';
		942	$answerString .= $student_ans."\t";
		943	$scores .= $answerHash{$_}->{score} >= 1 ? "1" : "0";
		944	}
		945	$answerString = '' unless defined($answerString); # insure string is defined.
		946	writeCourseLog($self->{ce}, "answer_log",
		947	join("",
		948	'\|', $problem->user_id,
		949	'\|', $problem->set_id,
		950	'\|', $problem->problem_id,
		951	'\|', $scores, "\t",
		952	time(),"\t",
		953	$answerString,
		954	),
317	);	955	);
318	}	956
319	}	957	}
		958	}
		959
		960	debug("end answer processing");
320		961
321	##### output #####	962	##### output #####
		963	# custom message for editor
		964	if ($authz->hasPermissions($user, "modify_problem_sets") and defined $editMode) {
		965	if ($editMode eq "temporaryFile") {
		966	print CGI::p(CGI::div({class=>'temporaryFile'}, "Viewing temporary file: ", $problem->source_file));
		967	} elsif ($editMode eq "savedFile") {
		968	# taken care of in the initialization phase
		969	}
		970	}
		971	print CGI::start_div({class=>"problemHeader"});
322		972
		973
		974
323	# attempt summary	975	# attempt summary
324	if ($submitAnswers or $will{showCorrectAnswers}) {	976	#FIXME -- the following is a kludge: if showPartialCorrectAnswers is negative don't show anything.
		977	# until after the due date
		978	# do I need to check $will{showCorrectAnswers} to make preflight work??
		979	if (($pg->{flags}->{showPartialCorrectAnswers} >= 0 and $submitAnswers) ) {
325	# print this if user submitted answers OR requested correct answers	980	# print this if user submitted answers OR requested correct answers
326	print $self->attemptResults($pg, $submitAnswers, $will{showCorrectAnswers},	981
		982	print $self->attemptResults($pg, 1,
		983	$will{showCorrectAnswers},
327	$pg->{flags}->{showPartialCorrectAnswers}, 0);	984	$pg->{flags}->{showPartialCorrectAnswers}, 1, 1);
		985	} elsif ($checkAnswers) {
		986	# print this if user previewed answers
		987	print CGI::div({class=>'ResultsWithError'},"ANSWERS ONLY CHECKED -- ANSWERS NOT RECORDED"), CGI::br();
		988	print $self->attemptResults($pg, 1, $will{showCorrectAnswers}, 1, 1, 1);
		989	# show attempt answers
		990	# show correct answers if asked
		991	# show attempt results (correctness)
		992	# show attempt previews
328	} elsif ($previewAnswers) {	993	} elsif ($previewAnswers) {
329	# print this if user previewed answers	994	# print this if user previewed answers
330	print $self->attemptResults($pg, 1, 0, 0, 1);	995	print CGI::div({class=>'ResultsWithError'},"PREVIEW ONLY -- ANSWERS NOT RECORDED"),CGI::br(),$self->attemptResults($pg, 1, 0, 0, 0, 1);
331	# don't show correctness	996	# show attempt answers
332	# don't show correct answers	997	# don't show correct answers
		998	# don't show attempt results (correctness)
		999	# show attempt previews
		1000	}
		1001
		1002	print CGI::end_div();
		1003
		1004	# main form
		1005	print "\n";
		1006	print CGI::start_form(-method=>"POST", -action=> $r->uri,-name=>"problemMainForm", onSubmit=>"submitAction()");
		1007	print $self->hidden_authen_fields;
		1008	print "\n";
		1009	print CGI::start_div({class=>"problem"});
		1010	print CGI::p($pg->{body_text});
		1011	print CGI::p(CGI::b("Note: "). CGI::i($pg->{result}->{msg})) if $pg->{result}->{msg};
		1012	print $editorLink; # this is empty unless it is appropriate to have an editor link.
		1013	print CGI::end_div();
		1014
		1015	print CGI::start_p();
		1016
		1017	if ($can{showCorrectAnswers}) {
		1018	print CGI::checkbox(
		1019	-name => "showCorrectAnswers",
		1020	-checked => $will{showCorrectAnswers},
		1021	-label => "Show correct answers",
		1022	);
		1023	}
		1024	if ($can{showHints}) {
		1025	print CGI::div({style=>"color:red"},
		1026	CGI::checkbox(
		1027	-name => "showHints",
		1028	-checked => $will{showHints},
		1029	-label => "Show Hints",
		1030	)
		1031	);
		1032	}
		1033	if ($can{showSolutions}) {
		1034	print CGI::checkbox(
		1035	-name => "showSolutions",
		1036	-checked => $will{showSolutions},
		1037	-label => "Show Solutions",
		1038	);
		1039	}
		1040
		1041	if ($can{showCorrectAnswers} or $can{showHints} or $can{showSolutions}) {
		1042	print CGI::br();
		1043	}
		1044
		1045	print CGI::submit(-name=>"previewAnswers", -label=>"Preview Answers");
		1046	if ($can{checkAnswers}) {
		1047	print CGI::submit(-name=>"checkAnswers", -label=>"Check Answers");
		1048	}
		1049	if ($can{getSubmitButton}) {
		1050	if ($user ne $effectiveUser) {
		1051	# if acting as a student, make it clear that answer submissions will
		1052	# apply to the student's records, not the professor's.
		1053	print CGI::submit(-name=>"submitAnswers", -label=>"Submit Answers for $effectiveUser");
		1054	} else {
		1055	print CGI::submit(-name=>"submitAnswers", -label=>"Submit Answers");
333	}	1056	}
		1057	}
		1058
		1059	print CGI::end_p();
		1060
		1061	print CGI::start_div({class=>"scoreSummary"});
334		1062
335	# score summary	1063	# score summary
336	my $attempts = $problem->num_correct + $problem->num_incorrect;	1064	my $attempts = $problem->num_correct + $problem->num_incorrect;
337	my $attemptsNoun = $attempts != 1 ? "times" : "time";	1065	my $attemptsNoun = $attempts != 1 ? "times" : "time";
338	my $lastScore = int ($problem->status * 100) . "%";	1066	my $problem_status = $problem->status \|\| 0;
		1067	my $lastScore = sprintf("%.0f%%", $problem_status * 100); # Round to whole number
339	my ($attemptsLeft, $attemptsLeftNoun);	1068	my ($attemptsLeft, $attemptsLeftNoun);
340	if ($problem->max_attempts == -1) {	1069	if ($problem->max_attempts == -1) {
341	# unlimited attempts	1070	# unlimited attempts
342	$attemptsLeft = "unlimited";	1071	$attemptsLeft = "unlimited";
343	$attemptsLeftNoun = "attempts";	1072	$attemptsLeftNoun = "attempts";
344	} else {	1073	} else {
345	$attemptsLeft = $problem->max_attempts - $attempts;	1074	$attemptsLeft = $problem->max_attempts - $attempts;
346	$attemptsLeftNoun = $attemptsLeft == 1 ? "attempt" : "attempts";	1075	$attemptsLeftNoun = $attemptsLeft == 1 ? "attempt" : "attempts";
347	}	1076	}
		1077
		1078	my $setClosed = 0;
348	my $setClosedMessage;	1079	my $setClosedMessage;
349	if (time < $set->open_date or time > $set->due_date) {	1080	if (before($set->open_date) or after($set->due_date)) {
		1081	$setClosed = 1;
		1082	if (before($set->open_date)) {
		1083	$setClosedMessage = "This homework set is not yet open.";
		1084	} elsif (after($set->due_date)) {
350	$setClosedMessage = "This problem set is closed.";	1085	$setClosedMessage = "This homework set is closed.";
351	if ($permissionLevel > 0) {	1086	}
		1087	}
		1088	#if (before($set->open_date) or after($set->due_date)) {
		1089	# $setClosed = 1;
		1090	# $setClosedMessage = "This homework set is closed.";
		1091	# if ($authz->hasPermissions($user, "view_answers")) {
352	$setClosedMessage .= " Since you are a privileged user, additional attempts will be recorded.";	1092	# $setClosedMessage .= " However, since you are a privileged user, additional attempts will be recorded.";
353	} else {	1093	# } else {
354	$setClosedMessage .= " Additional attempts will not be recorded.";	1094	# $setClosedMessage .= " Additional attempts will not be recorded.";
355	}	1095	# }
356	}	1096	#}
		1097	unless (defined( $pg->{state}->{state_summary_msg}) and $pg->{state}->{state_summary_msg}=~/\S/) {
		1098	my $notCountedMessage = ($problem->value) ? "" : "(This problem will not count towards your grade.)";
357	print CGI::p(	1099	print CGI::p(join("",
		1100	$submitAnswers ? $scoreRecordedMessage . CGI::br() : "",
358	"You have attempted this problem $attempts $attemptsNoun.", CGI::br(),	1101	"You have attempted this problem $attempts $attemptsNoun.", CGI::br(),
		1102	$submitAnswers ?"You received a score of ".sprintf("%.0f%%", $pg->{result}->{score} * 100)." for this attempt.".CGI::br():'',
359	$problem->attempted	1103	$problem->attempted
360	? "Your recorded score is $lastScore." . CGI::br()	1104	? "Your overall recorded score is $lastScore. $notCountedMessage" . CGI::br()
361	: "",	1105	: "",
362	"You have $attemptsLeft $attemptsLeftNoun remaining.", CGI::br(),	1106	$setClosed ? $setClosedMessage : "You have $attemptsLeft $attemptsLeftNoun remaining."
363	$setClosedMessage,	1107	));
		1108	}else {
		1109	print CGI::p($pg->{state}->{state_summary_msg});
		1110	}
		1111	print CGI::end_div();
		1112
		1113	# save state for viewOptions
		1114	print CGI::hidden(
		1115	-name => "showOldAnswers",
		1116	-value => $will{showOldAnswers}
		1117	),
		1118
		1119	CGI::hidden(
		1120	-name => "displayMode",
		1121	-value => $self->{displayMode}
		1122	);
		1123	print( CGI::hidden(
		1124	-name => 'editMode',
		1125	-value => $self->{editMode},
		1126	)
		1127	) if defined($self->{editMode}) and $self->{editMode} eq 'temporaryFile';
		1128	print( CGI::hidden(
		1129	-name => 'sourceFilePath',
		1130	-value => $self->{problem}->{source_file}
		1131	)) if defined($self->{problem}->{source_file});
		1132
		1133	print( CGI::hidden(
		1134	-name => 'problemSeed',
		1135	-value => $r->param("problemSeed")
		1136	)) if defined($r->param("problemSeed"));
		1137
		1138	# end of main form
		1139	print CGI::endform();
		1140
		1141	print CGI::start_div({class=>"problemFooter"});
		1142
		1143	## arguments for answer inspection button
		1144	#my $prof_url = $ce->{webworkURLs}->{oldProf};
		1145	#my $webworkURL = $ce->{webworkURLs}->{root};
		1146	#my $cgi_url = $prof_url;
		1147	#$cgi_url=~ s\|/[^/]*$\|\|; # clip profLogin.pl
		1148	#my $authen_args = $self->url_authen_args();
		1149	#my $showPastAnswersURL = "$webworkURL/$courseName/instructor/show_answers/";
		1150
		1151	my $pastAnswersPage = $urlpath->newFromModule("WeBWorK::ContentGenerator::Instructor::ShowAnswers",
		1152	courseID => $courseName);
		1153	my $showPastAnswersURL = $self->systemLink($pastAnswersPage, authen => 0); # no authen info for form action
		1154
		1155	# print answer inspection button
		1156	if ($authz->hasPermissions($user, "view_answers")) {
		1157	print "\n",
		1158	CGI::start_form(-method=>"POST",-action=>$showPastAnswersURL,-target=>"WW_Info"),"\n",
		1159	$self->hidden_authen_fields,"\n",
		1160	CGI::hidden(-name => 'courseID', -value=>$courseName), "\n",
		1161	CGI::hidden(-name => 'problemID', -value=>$problem->problem_id), "\n",
		1162	CGI::hidden(-name => 'setID', -value=>$problem->set_id), "\n",
		1163	CGI::hidden(-name => 'studentUser', -value=>$problem->user_id), "\n",
		1164	CGI::p( {-align=>"left"},
		1165	CGI::submit(-name => 'action', -value=>'Show Past Answers')
		1166	), "\n",
		1167	CGI::endform();
		1168	}
		1169
		1170	## feedback form url
		1171	#my $feedbackPage = $urlpath->newFromModule("WeBWorK::ContentGenerator::Feedback",
		1172	# courseID => $courseName);
		1173	#my $feedbackURL = $self->systemLink($feedbackPage, authen => 0); # no authen info for form action
		1174	#
		1175	##print feedback form
		1176	#print
		1177	# CGI::start_form(-method=>"POST", -action=>$feedbackURL),"\n",
		1178	# $self->hidden_authen_fields,"\n",
		1179	# CGI::hidden("module", __PACKAGE__),"\n",
		1180	# CGI::hidden("set", $set->set_id),"\n",
		1181	# CGI::hidden("problem", $problem->problem_id),"\n",
		1182	# CGI::hidden("displayMode", $self->{displayMode}),"\n",
		1183	# CGI::hidden("showOldAnswers", $will{showOldAnswers}),"\n",
		1184	# CGI::hidden("showCorrectAnswers", $will{showCorrectAnswers}),"\n",
		1185	# CGI::hidden("showHints", $will{showHints}),"\n",
		1186	# CGI::hidden("showSolutions", $will{showSolutions}),"\n",
		1187	# CGI::p({-align=>"left"},
		1188	# CGI::submit(-name=>"feedbackForm", -label=>"Email instructor")
		1189	# ),
		1190	# CGI::endform(),"\n";
		1191
		1192	print $self->feedbackMacro(
		1193	module => __PACKAGE__,
		1194	set => $self->{set}->set_id,
		1195	problem => $problem->problem_id,
		1196	displayMode => $self->{displayMode},
		1197	showOldAnswers => $will{showOldAnswers},
		1198	showCorrectAnswers => $will{showCorrectAnswers},
		1199	showHints => $will{showHints},
		1200	showSolutions => $will{showSolutions},
364	);	1201	);
365		1202
366	print CGI::hr();	1203	print CGI::end_div();
367
368	# main form
369	print
370	CGI::startform("POST", $r->uri),
371	$self->hidden_authen_fields,
372	CGI::p(CGI::i($pg->{result}->{msg})),
373	CGI::p($pg->{body_text}),
374	CGI::p(
375	CGI::submit(-name=>"submitAnswers", -label=>"Submit Answers"),
376	CGI::submit(-name=>"previewAnswers", -label=>"Preview Answers"),
377	),
378	$self->viewOptions(),
379	CGI::endform();
380
381	# feedback form
382	my $ce = $self->{courseEnvironment};
383	my $root = $ce->{webworkURLs}->{root};
384	my $courseName = $ce->{courseName};
385	my $feedbackURL = "$root/$courseName/feedback/";
386	print
387	CGI::startform("POST", $feedbackURL),
388	$self->hidden_authen_fields,
389	CGI::hidden("module", __PACKAGE__),
390	CGI::hidden("set", $set->id),
391	CGI::hidden("problem", $problem->id),
392	CGI::hidden("displayMode", $self->{displayMode}),
393	CGI::hidden("showOldAnswers", $will{showOldAnswers}),
394	CGI::hidden("showCorrectAnswers", $will{showCorrectAnswers}),
395	CGI::hidden("showHints", $will{showHints}),
396	CGI::hidden("showSolutions", $will{showSolutions}),
397	CGI::p({-align=>"right"},
398	CGI::submit(-name=>"feedbackForm", -label=>"Send Feedback")
399	),
400	CGI::endform();
401
402	# warning output
403	if ($pg->{warnings} ne "") {
404	print CGI::hr(), warningOutput($pg->{warnings});
405	}
406		1204
407	# debugging stuff	1205	# debugging stuff
		1206	if (0) {
408	#print	1207	print
409	# CGI::hr(),	1208	CGI::hr(),
410	# CGI::h2("debugging information"),	1209	CGI::h2("debugging information"),
411	# CGI::h3("form fields"),	1210	CGI::h3("form fields"),
412	# ref2string($self->{formFields}),	1211	ref2string($self->{formFields}),
413	# CGI::h3("user object"),	1212	CGI::h3("user object"),
414	# ref2string($self->{user}),	1213	ref2string($self->{user}),
415	# CGI::h3("set object"),	1214	CGI::h3("set object"),
416	# ref2string($set),	1215	ref2string($set),
417	# CGI::h3("problem object"),	1216	CGI::h3("problem object"),
418	# ref2string($problem),	1217	ref2string($problem),
419	# CGI::h3("PG object"),	1218	CGI::h3("PG object"),
420	# ref2string($pg, {'WeBWorK::PG::Translator' => 1});	1219	ref2string($pg, {'WeBWorK::PG::Translator' => 1});
		1220	}
421		1221
422	return "";	1222	return "";
423	}	1223	}
424		1224
425	##### output utilities #####
426
427	# this is used by ProblemSet.pm too, so don't fuck it up
428	sub translationError($$) {
429	my ($error, $details) = @_;
430	return
431	CGI::h2("Software Error"),
432	CGI::p(<<EOF),
433	WeBWorK has encountered a software error while attempting to process this problem.
434	It is likely that there is an error in the problem itself.
435	If you are a student, contact your professor to have the error corrected.
436	If you are a professor, please consut the error output below for more informaiton.
437	EOF
438	CGI::h3("Error messages"), CGI::blockquote(CGI::pre($error)),
439	CGI::h3("Error context"), CGI::blockquote(CGI::pre($details));
440	}
441
442	# this is used by ProblemSet.pm too, so don't fuck it up
443	sub warningOutput($) {
444	my $warnings = shift;
445
446	return
447	CGI::h2("Software Warnings"),
448	CGI::p(<<EOF),
449	WeBWorK has encountered warnings while attempting to process this problem.
450	It is likely that this indicates an error or ambiguity in the problem itself.
451	If you are a student, contact your professor to have the problem corrected.
452	If you are a professor, please consut the error output below for more informaiton.
453	EOF
454	CGI::h3("Warning messages"),
455	CGI::blockquote(CGI::pre($warnings)),
456	;
457	}
458
459	sub attemptResults($$$$$) {
460	my $self = shift;
461	my $pg = shift;
462	my $showAttemptAnswers = shift;
463	my $showCorrectAnswers = shift;
464	my $showAttemptResults = $showAttemptAnswers && shift;
465	my $showAttemptPreview = shift \|\| 0;
466	my $problemResult = $pg->{result}; # the overall result of the problem
467	my @answerNames = @{ $pg->{flags}->{ANSWER_ENTRY_ORDER} };
468
469	my $showMessages = $showAttemptAnswers && grep { $pg->{answers}->{$_}->{ans_message} } @answerNames;
470
471	my $header = CGI::th("part");
472	$header .= $showAttemptAnswers ? CGI::th("entered") : "";
473	$header .= $showAttemptPreview ? CGI::th("preview") : "";
474	$header .= $showCorrectAnswers ? CGI::th("correct") : "";
475	$header .= $showAttemptResults ? CGI::th("result") : "";
476	$header .= $showMessages ? CGI::th("messages") : "";
477	my @tableRows = ( $header );
478	my $numCorrect;
479	foreach my $name (@answerNames) {
480	my $answerResult = $pg->{answers}->{$name};
481	my $studentAnswer = $answerResult->{student_ans}; # original_student_ans
482	my $preview = ($showAttemptPreview
483	? $self->previewAnswer($answerResult)
484	: "");
485	my $correctAnswer = $answerResult->{correct_ans};
486	my $answerScore = $answerResult->{score};
487	my $answerMessage = $showMessages ? $answerResult->{ans_message} : "";
488
489	$numCorrect += $answerScore > 0;
490	my $resultString = $answerScore ? "correct" : "incorrect";
491
492	# get rid of the goofy prefix on the answer names (supposedly, the format
493	# of the answer names is changeable. this only fixes it for "AnSwEr"
494	$name =~ s/^AnSwEr//;
495
496	my $row = CGI::td($name);
497	$row .= $showAttemptAnswers ? CGI::td($studentAnswer) : "";
498	$row .= $showAttemptPreview ? CGI::td($preview) : "";
499	$row .= $showCorrectAnswers ? CGI::td($correctAnswer) : "";
500	$row .= $showAttemptResults ? CGI::td($resultString) : "";
501	$row .= $answerMessage ? CGI::td($answerMessage) : "";
502	push @tableRows, $row;
503	}
504
505	my $numCorrectNoun = $numCorrect == 1 ? "question" : "questions";
506	my $scorePercent = int ($problemResult->{score} * 100) . "\%";
507	my $summary = "On this attempt, you answered $numCorrect $numCorrectNoun out of "
508	. scalar @answerNames . " correct, for a score of $scorePercent.";
509	return CGI::table({-border=>1}, CGI::Tr(\@tableRows)) . CGI::p($summary);
510	}
511
512	sub viewOptions($) {
513	my $self = shift;
514	my $displayMode = $self->{displayMode};
515	my %must = %{ $self->{must} };
516	my %can = %{ $self->{can} };
517	my %will = %{ $self->{will} };
518
519	my $optionLine;
520	$can{showOldAnswers} and $optionLine .= join "",
521	"Show:  ",
522	CGI::checkbox(
523	-name => "showOldAnswers",
524	-checked => $will{showOldAnswers},
525	-label => "Saved answers",
526	), "  ";
527	$can{showCorrectAnswers} and $optionLine .= join "",
528	CGI::checkbox(
529	-name => "showCorrectAnswers",
530	-checked => $will{showCorrectAnswers},
531	-label => "Correct answers",
532	), "  ";
533	$can{showHints} and $optionLine .= join "",
534	CGI::checkbox(
535	-name => "showHints",
536	-checked => $will{showHints},
537	-label => "Hints",
538	), "  ";
539	$can{showSolutions} and $optionLine .= join "",
540	CGI::checkbox(
541	-name => "showSolutions",
542	-checked => $will{showSolutions},
543	-label => "Solutions",
544	), "  ";
545	$optionLine and $optionLine .= join "", CGI::br();
546
547	return CGI::div({-style=>"border: thin groove; padding: 1ex; margin: 2ex"},
548	"View equations as:  ",
549	CGI::radio_group(
550	-name => "displayMode",
551	-values => ['plainText', 'formattedText', 'images'],
552	-default => $displayMode,
553	-labels => {
554	plainText => "plain text",
555	formattedText => "formatted text",
556	images => "images",
557	}
558	), CGI::br(),
559	$optionLine,
560	CGI::submit(-name=>"redisplay", -label=>"Redisplay Problem"),
561	);
562	}
563
564	sub previewAnswer($$) {
565	my ($self, $answerResult) = @_;
566	my $ce = $self->{courseEnvironment};
567	my $effectiveUser = $self->{effectiveUser};
568	my $set = $self->{set};
569	my $problem = $self->{problem};
570	my $displayMode = $self->{displayMode};
571
572	# note: right now, we have to do things completely differently when we are
573	# rendering math from INSIDE the translator and from OUTSIDE the translator.
574	# so we'll just deal with each case explicitly here. there's some code
575	# duplication that can be dealt with later by abstracting out tth/dvipng/etc.
576
577	my $tex = $answerResult->{preview_latex_string};
578
579	if ($displayMode eq "plainText") {
580	return $tex;
581	} elsif ($displayMode eq "formattedText") {
582	my $tthCommand = $ce->{externalPrograms}->{tth}
583	. " -L -f5 -r 2> /dev/null <<END_OF_INPUT; echo > /dev/null\n"
584	. "\$$tex\$\n"
585	. "END_OF_INPUT\n";
586
587
588	# call tth
589	my $result = `$tthCommand`;
590	if ($?) {
591	return "<b>[tth failed: $? $@]</b>";
592	}
593	return $result;
594	} elsif ($displayMode eq "images") {
595	# how are we going to name this?
596	my $targetPathCommon = "/png/"
597	. $effectiveUser->id . "."
598	. $set->id . "."
599	. $problem->id . "."
600	. $answerResult->{ans_name} . ".png";
601
602	# figure out where to put things
603	my $wd = tempdir("webwork-dvipng-XXXXXXXX", DIR => $ce->{courseDirs}->{html_temp});
604	my $latex = $ce->{externalPrograms}->{latex};
605	my $dvipng = $ce->{externalPrograms}->{dvipng};
606	my $targetPath = $ce->{courseDirs}->{html_temp} . $targetPathCommon;
607	# should use surePathToTmpFile, but we have to
608	# isolate it from the problem enivronment first
609	my $targetURL = $ce->{courseURLs}->{html_temp} . $targetPathCommon;
610
611	# call dvipng to generate a preview
612	dvipng($wd, $latex, $dvipng, $tex, $targetPath);
613	if (-e $targetPath) {
614	return "<img src=\"$targetURL\" alt=\"$tex\" />";
615	} else {
616	return "<b>[math2img failed]</b>";
617	}
618	}
619	}
620
621	##### permission queries #####
622
623	# this stuff should be abstracted out into the permissions system
624	# however, the permission system only knows about things in the
625	# course environment and the username. hmmm...
626
627	# also, i should fix these so that they have a consistent calling
628	# format -- perhaps:
629	# canPERM($courseEnv, $user, $set, $problem, $permissionLevel)
630
631	sub canShowCorrectAnswers($$) {
632	my ($permissionLevel, $answerDate) = @_;
633	return $permissionLevel > 0 \|\| time > $answerDate;
634	}
635
636	sub canShowSolutions($$) {
637	my ($permissionLevel, $answerDate) = @_;
638	return canShowCorrectAnswers($permissionLevel, $answerDate);
639	}
640
641	sub canRecordAnswers($$$$$) {
642	my ($permissionLevel, $openDate, $dueDate, $maxAttempts, $attempts) = @_;
643	my $permHigh = $permissionLevel > 0;
644	my $timeOK = time >= $openDate && time <= $dueDate;
645	my $attemptsOK = $maxAttempts == -1 \|\| $attempts <= $maxAttempts;
646	my $recordAnswers = $permHigh \|\| ($timeOK && $attemptsOK);
647	return $recordAnswers;
648	}
649
650	sub mustRecordAnswers($) {
651	my ($permissionLevel) = @_;
652	return $permissionLevel == 0;
653	}
654
655	1;	1225	1;

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