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| 1 : | gage | 1247 | ################################################################################ |
| 2 : | # WeBWorK mod_perl (c) 2000-2002 WeBWorK Project | ||
| 3 : | # $Id$ | ||
| 4 : | ################################################################################ | ||
| 5 : | |||
| 6 : | package WeBWorK::PG::Local; | ||
| 7 : | |||
| 8 : | =head1 NAME | ||
| 9 : | |||
| 10 : | WeBWorK::PG::Local - Use the WeBWorK::PG API to invoke a local | ||
| 11 : | WeBWorK::PG::Translator object. | ||
| 12 : | |||
| 13 : | =head1 DESCRIPTION | ||
| 14 : | |||
| 15 : | WeBWorK::PG::Local encapsulates the PG translation process, making multiple | ||
| 16 : | calls to WeBWorK::PG::Translator. Much of the flexibility of the Translator is | ||
| 17 : | hidden, instead making choices that are appropriate for the webwork-modperl | ||
| 18 : | system | ||
| 19 : | |||
| 20 : | It implements the WeBWorK::PG interface and uses a local | ||
| 21 : | WeBWorK::PG::Translator to perform problem rendering. See the documentation for | ||
| 22 : | the WeBWorK::PG module for information about the API. | ||
| 23 : | |||
| 24 : | =cut | ||
| 25 : | |||
| 26 : | use strict; | ||
| 27 : | use warnings; | ||
| 28 : | use File::Path qw(rmtree); | ||
| 29 : | use WeBWorK::PG::ImageGenerator; | ||
| 30 : | use WeBWorK::PG::Translator; | ||
| 31 : | use WeBWorK::Utils qw(readFile formatDateTime writeTimingLogEntry makeTempDirectory); | ||
| 32 : | |||
| 33 : | sub new { | ||
| 34 : | my $invocant = shift; | ||
| 35 : | my $class = ref($invocant) || $invocant; | ||
| 36 : | my ( | ||
| 37 : | $ce, | ||
| 38 : | $user, | ||
| 39 : | $key, | ||
| 40 : | $set, | ||
| 41 : | $problem, | ||
| 42 : | $psvn, | ||
| 43 : | $formFields, # in CGI::Vars format | ||
| 44 : | $translationOptions, # hashref containing options for the | ||
| 45 : | # translator, such as whether to show | ||
| 46 : | # hints and the display mode to use | ||
| 47 : | ) = @_; | ||
| 48 : | |||
| 49 : | # write timing log entry | ||
| 50 : | writeTimingLogEntry($ce, "WeBWorK::PG::new", | ||
| 51 : | "user=".$user->user_id.",problem=".$ce->{courseName}."/".$set->set_id."/".$problem->problem_id.",mode=".$translationOptions->{displayMode}, | ||
| 52 : | "begin"); | ||
| 53 : | |||
| 54 : | # install a local warn handler to collect warnings | ||
| 55 : | my $warnings = ""; | ||
| 56 : | local $SIG{__WARN__} = sub { $warnings .= shift } | ||
| 57 : | if $ce->{pg}->{options}->{catchWarnings}; | ||
| 58 : | |||
| 59 : | # create a Translator | ||
| 60 : | #warn "PG: creating a Translator\n"; | ||
| 61 : | my $translator = WeBWorK::PG::Translator->new; | ||
| 62 : | |||
| 63 : | # set the directory hash | ||
| 64 : | #warn "PG: setting the directory hash\n"; | ||
| 65 : | $translator->rh_directories({ | ||
| 66 : | courseScriptsDirectory => $ce->{pg}->{directories}->{macros}, | ||
| 67 : | macroDirectory => $ce->{courseDirs}->{macros}, | ||
| 68 : | templateDirectory => $ce->{courseDirs}->{templates}, | ||
| 69 : | tempDirectory => $ce->{courseDirs}->{html_temp}, | ||
| 70 : | }); | ||
| 71 : | |||
| 72 : | # evaluate modules and "extra packages" | ||
| 73 : | #warn "PG: evaluating modules and \"extra packages\"\n"; | ||
| 74 : | my @modules = @{ $ce->{pg}->{modules} }; | ||
| 75 : | foreach my $module_packages_ref (@modules) { | ||
| 76 : | my ($module, @extra_packages) = @$module_packages_ref; | ||
| 77 : | # the first item is the main package | ||
| 78 : | $translator->evaluate_modules($module); | ||
| 79 : | # the remaining items are "extra" packages | ||
| 80 : | $translator->load_extra_packages(@extra_packages); | ||
| 81 : | } | ||
| 82 : | |||
| 83 : | # set the environment (from defineProblemEnvir) | ||
| 84 : | #warn "PG: setting the environment (from defineProblemEnvir)\n"; | ||
| 85 : | my $envir = defineProblemEnvir( | ||
| 86 : | $ce, | ||
| 87 : | $user, | ||
| 88 : | $key, | ||
| 89 : | $set, | ||
| 90 : | $problem, | ||
| 91 : | $psvn, | ||
| 92 : | $formFields, | ||
| 93 : | $translationOptions, | ||
| 94 : | ); | ||
| 95 : | $translator->environment($envir); | ||
| 96 : | |||
| 97 : | # initialize the Translator | ||
| 98 : | #warn "PG: initializing the Translator\n"; | ||
| 99 : | $translator->initialize(); | ||
| 100 : | |||
| 101 : | # load IO.pl, PG.pl, and dangerousMacros.pl using unrestricted_load | ||
| 102 : | # i'd like to change this at some point to have the same sort of interface to global.conf | ||
| 103 : | # that the module loading does -- have a list of macros to load unrestrictedly. | ||
| 104 : | #warn "PG: loading IO.pl, PG.pl, and dangerousMacros.pl using unrestricted_load\n"; | ||
| 105 : | foreach (qw(IO.pl PG.pl dangerousMacros.pl)) { | ||
| 106 : | my $macroPath = $ce->{pg}->{directories}->{macros} . "/$_"; | ||
| 107 : | my $err = $translator->unrestricted_load($macroPath); | ||
| 108 : | warn "Error while loading $macroPath: $err" if $err; | ||
| 109 : | } | ||
| 110 : | |||
| 111 : | # set the opcode mask (using default values) | ||
| 112 : | #warn "PG: setting the opcode mask (using default values)\n"; | ||
| 113 : | $translator->set_mask(); | ||
| 114 : | |||
| 115 : | # store the problem source | ||
| 116 : | #warn "PG: storing the problem source\n"; | ||
| 117 : | my $sourceFile = $problem->source_file; | ||
| 118 : | $sourceFile = $ce->{courseDirs}->{templates}."/".$sourceFile | ||
| 119 : | unless ($sourceFile =~ /^\//); | ||
| 120 : | eval { $translator->source_string(readFile($sourceFile)) }; | ||
| 121 : | if ($@) { | ||
| 122 : | # well, we couldn't get the problem source, for some reason. | ||
| 123 : | return bless { | ||
| 124 : | translator => $translator, | ||
| 125 : | head_text => "", | ||
| 126 : | body_text => <<EOF, | ||
| 127 : | WeBWorK::Utils::readFile($sourceFile) says: | ||
| 128 : | $@ | ||
| 129 : | EOF | ||
| 130 : | answers => {}, | ||
| 131 : | result => {}, | ||
| 132 : | state => {}, | ||
| 133 : | errors => "Failed to read the problem source file.", | ||
| 134 : | warnings => $warnings, | ||
| 135 : | flags => {error_flag => 1}, | ||
| 136 : | }, $class; | ||
| 137 : | } | ||
| 138 : | |||
| 139 : | # install a safety filter (&safetyFilter) | ||
| 140 : | #warn "PG: installing a safety filter\n"; | ||
| 141 : | $translator->rf_safety_filter(\&safetyFilter); | ||
| 142 : | |||
| 143 : | # write timing log entry -- the translator is now all set up | ||
| 144 : | writeTimingLogEntry($ce, "WeBWorK::PG::new", | ||
| 145 : | "initialized", | ||
| 146 : | "intermediate"); | ||
| 147 : | |||
| 148 : | # translate the PG source into text | ||
| 149 : | #warn "PG: translating the PG source into text\n"; | ||
| 150 : | $translator->translate(); | ||
| 151 : | |||
| 152 : | # after we're done translating, we may have to clean up after the | ||
| 153 : | # translator: | ||
| 154 : | |||
| 155 : | # for example, HTML_img mode uses a tempdir for dvipng's temp files.\ | ||
| 156 : | # We have to remove it. | ||
| 157 : | if ($envir->{dvipngTempDir}) { | ||
| 158 : | rmtree($envir->{dvipngTempDir}, 0, 0); | ||
| 159 : | } | ||
| 160 : | |||
| 161 : | # HTML_dpng, on the other hand, uses an ImageGenerator. We have to | ||
| 162 : | # render the queued equations. | ||
| 163 : | if ($envir->{imagegen}) { | ||
| 164 : | my $sourceFile = $ce->{courseDirs}->{templates} . "/" . $problem->source_file; | ||
| 165 : | my %mtimeOption = -e $sourceFile | ||
| 166 : | ? (mtime => (stat $sourceFile)[9]) | ||
| 167 : | : (); | ||
| 168 : | |||
| 169 : | $envir->{imagegen}->render( | ||
| 170 : | refresh => $translationOptions->{refreshMath2img}, | ||
| 171 : | %mtimeOption, | ||
| 172 : | ); | ||
| 173 : | } | ||
| 174 : | |||
| 175 : | my ($result, $state); # we'll need these on the other side of the if block! | ||
| 176 : | if ($translationOptions->{processAnswers}) { | ||
| 177 : | |||
| 178 : | # process student answers | ||
| 179 : | #warn "PG: processing student answers\n"; | ||
| 180 : | $translator->process_answers($formFields); | ||
| 181 : | |||
| 182 : | # retrieve the problem state and give it to the translator | ||
| 183 : | #warn "PG: retrieving the problem state and giving it to the translator\n"; | ||
| 184 : | $translator->rh_problem_state({ | ||
| 185 : | recorded_score => $problem->status, | ||
| 186 : | num_of_correct_ans => $problem->num_correct, | ||
| 187 : | num_of_incorrect_ans => $problem->num_incorrect, | ||
| 188 : | }); | ||
| 189 : | |||
| 190 : | # determine an entry order -- the ANSWER_ENTRY_ORDER flag is built by | ||
| 191 : | # the PG macro package (PG.pl) | ||
| 192 : | #warn "PG: determining an entry order\n"; | ||
| 193 : | my @answerOrder = | ||
| 194 : | $translator->rh_flags->{ANSWER_ENTRY_ORDER} | ||
| 195 : | ? @{ $translator->rh_flags->{ANSWER_ENTRY_ORDER} } | ||
| 196 : | : keys %{ $translator->rh_evaluated_answers }; | ||
| 197 : | |||
| 198 : | # install a grader -- use the one specified in the problem, | ||
| 199 : | # or fall back on the default from the course environment. | ||
| 200 : | # (two magic strings are accepted, to avoid having to | ||
| 201 : | # reference code when it would be difficult.) | ||
| 202 : | #warn "PG: installing a grader\n"; | ||
| 203 : | my $grader = $translator->rh_flags->{PROBLEM_GRADER_TO_USE} | ||
| 204 : | || $ce->{pg}->{options}->{grader}; | ||
| 205 : | $grader = $translator->rf_std_problem_grader | ||
| 206 : | if $grader eq "std_problem_grader"; | ||
| 207 : | $grader = $translator->rf_avg_problem_grader | ||
| 208 : | if $grader eq "avg_problem_grader"; | ||
| 209 : | die "Problem grader $grader is not a CODE reference." | ||
| 210 : | unless ref $grader eq "CODE"; | ||
| 211 : | $translator->rf_problem_grader($grader); | ||
| 212 : | |||
| 213 : | # grade the problem | ||
| 214 : | #warn "PG: grading the problem\n"; | ||
| 215 : | ($result, $state) = $translator->grade_problem( | ||
| 216 : | answers_submitted => $translationOptions->{processAnswers}, | ||
| 217 : | ANSWER_ENTRY_ORDER => \@answerOrder, | ||
| 218 : | ); | ||
| 219 : | |||
| 220 : | } | ||
| 221 : | |||
| 222 : | # write timing log entry | ||
| 223 : | writeTimingLogEntry($ce, "WeBWorK::PG::new", "", "end"); | ||
| 224 : | |||
| 225 : | # return an object which contains the translator and the results of | ||
| 226 : | # the translation process. this is DIFFERENT from the "format expected | ||
| 227 : | # by Webwork.pm (and I believe processProblem8, but check.)" | ||
| 228 : | return bless { | ||
| 229 : | translator => $translator, | ||
| 230 : | head_text => ${ $translator->r_header }, | ||
| 231 : | body_text => ${ $translator->r_text }, | ||
| 232 : | answers => $translator->rh_evaluated_answers, | ||
| 233 : | result => $result, | ||
| 234 : | state => $state, | ||
| 235 : | errors => $translator->errors, | ||
| 236 : | warnings => $warnings, | ||
| 237 : | flags => $translator->rh_flags, | ||
| 238 : | }, $class; | ||
| 239 : | } | ||
| 240 : | |||
| 241 : | # ----- | ||
| 242 : | |||
| 243 : | sub defineProblemEnvir { | ||
| 244 : | my ( | ||
| 245 : | $ce, | ||
| 246 : | $user, | ||
| 247 : | $key, | ||
| 248 : | $set, | ||
| 249 : | $problem, | ||
| 250 : | $psvn, | ||
| 251 : | $formFields, | ||
| 252 : | $options, | ||
| 253 : | ) = @_; | ||
| 254 : | |||
| 255 : | my %envir; | ||
| 256 : | |||
| 257 : | # ---------------------------------------------------------------------- | ||
| 258 : | |||
| 259 : | # PG environment variables | ||
| 260 : | # from docs/pglanguage/pgreference/environmentvariables as of 06/25/2002 | ||
| 261 : | # any changes are noted by "ADDED:" or "REMOVED:" | ||
| 262 : | |||
| 263 : | # Vital state information | ||
| 264 : | # ADDED: displayHintsQ, displaySolutionsQ, refreshMath2img, | ||
| 265 : | # texDisposition | ||
| 266 : | |||
| 267 : | $envir{psvn} = $set->psvn; | ||
| 268 : | $envir{psvnNumber} = $envir{psvn}; | ||
| 269 : | $envir{probNum} = $problem->problem_id; | ||
| 270 : | $envir{questionNumber} = $envir{probNum}; | ||
| 271 : | $envir{fileName} = $problem->source_file; | ||
| 272 : | $envir{probFileName} = $envir{fileName}; | ||
| 273 : | $envir{problemSeed} = $problem->problem_seed; | ||
| 274 : | $envir{displayMode} = translateDisplayModeNames($options->{displayMode}); | ||
| 275 : | $envir{languageMode} = $envir{displayMode}; | ||
| 276 : | $envir{outputMode} = $envir{displayMode}; | ||
| 277 : | $envir{displayHintsQ} = $options->{showHints}; | ||
| 278 : | $envir{displaySolutionsQ} = $options->{showSolutions}; | ||
| 279 : | # FIXME: this is HTML_img specific | ||
| 280 : | #$envir{refreshMath2img} = $options->{refreshMath2img}; | ||
| 281 : | $envir{texDisposition} = "pdf"; # in webwork-modperl, we use pdflatex | ||
| 282 : | |||
| 283 : | # Problem Information | ||
| 284 : | # ADDED: courseName, formatedDueDate | ||
| 285 : | |||
| 286 : | $envir{openDate} = $set->open_date; | ||
| 287 : | $envir{formattedOpenDate} = formatDateTime($envir{openDate}); | ||
| 288 : | $envir{dueDate} = $set->due_date; | ||
| 289 : | $envir{formattedDueDate} = formatDateTime($envir{dueDate}); | ||
| 290 : | $envir{formatedDueDate} = $envir{formattedDueDate}; # typo in many header files | ||
| 291 : | $envir{answerDate} = $set->answer_date; | ||
| 292 : | $envir{formattedAnswerDate} = formatDateTime($envir{answerDate}); | ||
| 293 : | $envir{numOfAttempts} = ($problem->num_correct || 0) + ($problem->num_incorrect || 0); | ||
| 294 : | $envir{problemValue} = $problem->value; | ||
| 295 : | $envir{sessionKey} = $key; | ||
| 296 : | $envir{courseName} = $ce->{courseName}; | ||
| 297 : | |||
| 298 : | # Student Information | ||
| 299 : | # ADDED: studentID | ||
| 300 : | |||
| 301 : | $envir{sectionName} = $user->section; | ||
| 302 : | $envir{sectionNumber} = $envir{sectionName}; | ||
| 303 : | $envir{recitationName} = $user->recitation; | ||
| 304 : | $envir{recitationNumber} = $envir{recitationName}; | ||
| 305 : | $envir{setNumber} = $set->set_id; | ||
| 306 : | $envir{studentLogin} = $user->user_id; | ||
| 307 : | $envir{studentName} = $user->first_name . " " . $user->last_name; | ||
| 308 : | $envir{studentID} = $user->student_id; | ||
| 309 : | |||
| 310 : | # Answer Information | ||
| 311 : | # REMOVED: refSubmittedAnswers | ||
| 312 : | |||
| 313 : | $envir{inputs_ref} = $formFields; | ||
| 314 : | |||
| 315 : | # External Programs | ||
| 316 : | # ADDED: externalLaTeXPath, externalDvipngPath, | ||
| 317 : | # externalGif2EpsPath, externalPng2EpsPath | ||
| 318 : | |||
| 319 : | $envir{externalTTHPath} = $ce->{externalPrograms}->{tth}; | ||
| 320 : | $envir{externalLaTeXPath} = $ce->{externalPrograms}->{latex}; | ||
| 321 : | $envir{externalDvipngPath} = $ce->{externalPrograms}->{dvipng}; | ||
| 322 : | $envir{externalGif2EpsPath} = $ce->{externalPrograms}->{gif2eps}; | ||
| 323 : | $envir{externalPng2EpsPath} = $ce->{externalPrograms}->{png2eps}; | ||
| 324 : | $envir{externalGif2PngPath} = $ce->{externalPrograms}->{gif2png}; | ||
| 325 : | |||
| 326 : | # Directories and URLs | ||
| 327 : | # REMOVED: courseName | ||
| 328 : | # ADDED: dvipngTempDir | ||
| 329 : | |||
| 330 : | $envir{cgiDirectory} = undef; | ||
| 331 : | $envir{cgiURL} = undef; | ||
| 332 : | $envir{classDirectory} = undef; | ||
| 333 : | $envir{courseScriptsDirectory} = $ce->{pg}->{directories}->{macros}."/"; | ||
| 334 : | $envir{htmlDirectory} = $ce->{courseDirs}->{html}."/"; | ||
| 335 : | $envir{htmlURL} = $ce->{courseURLs}->{html}."/"; | ||
| 336 : | $envir{macroDirectory} = $ce->{courseDirs}->{macros}."/"; | ||
| 337 : | $envir{templateDirectory} = $ce->{courseDirs}->{templates}."/"; | ||
| 338 : | $envir{tempDirectory} = $ce->{courseDirs}->{html_temp}."/"; | ||
| 339 : | $envir{tempURL} = $ce->{courseURLs}->{html_temp}."/"; | ||
| 340 : | $envir{scriptDirectory} = undef; | ||
| 341 : | $envir{webworkDocsURL} = $ce->{webworkURLs}->{docs}."/"; | ||
| 342 : | # FIXME: this is HTML_img mode-specific | ||
| 343 : | #$envir{dvipngTempDir} = $options->{displayMode} eq 'images' | ||
| 344 : | # ? makeTempDirectory($envir{tempDirectory}, "webwork-dvipng") | ||
| 345 : | # : undef; | ||
| 346 : | |||
| 347 : | # Information for sending mail | ||
| 348 : | |||
| 349 : | $envir{mailSmtpServer} = $ce->{mail}->{smtpServer}; | ||
| 350 : | $envir{mailSmtpSender} = $ce->{mail}->{smtpSender}; | ||
| 351 : | $envir{ALLOW_MAIL_TO} = $ce->{mail}->{allowedRecipients}; | ||
| 352 : | |||
| 353 : | # Default values for evaluating answers | ||
| 354 : | |||
| 355 : | my $ansEvalDefaults = $ce->{pg}->{ansEvalDefaults}; | ||
| 356 : | $envir{$_} = $ansEvalDefaults->{$_} foreach (keys %$ansEvalDefaults); | ||
| 357 : | |||
| 358 : | # ---------------------------------------------------------------------- | ||
| 359 : | |||
| 360 : | my $basename = "equation-$envir{psvn}.$envir{probNum}"; | ||
| 361 : | $basename .= ".$envir{problemSeed}" if $envir{problemSeed}; | ||
| 362 : | |||
| 363 : | # Object for generating equation images | ||
| 364 : | $envir{imagegen} = WeBWorK::PG::ImageGenerator->new( | ||
| 365 : | tempDir => $ce->{webworkDirs}->{tmp}, # global temp dir | ||
| 366 : | dir => $envir{tempDirectory}, | ||
| 367 : | url => $envir{tempURL}, | ||
| 368 : | basename => $basename, | ||
| 369 : | latex => $envir{externalLaTeXPath}, | ||
| 370 : | dvipng => $envir{externalDvipngPath}, | ||
| 371 : | ); | ||
| 372 : | |||
| 373 : | # Other things... | ||
| 374 : | $envir{QUIZ_PREFIX} = $options->{QUIZ_PREFIX}; # used by quizzes | ||
| 375 : | $envir{PROBLEM_GRADER_TO_USE} = $ce->{pg}->{options}->{grader}; | ||
| 376 : | $envir{PRINT_FILE_NAMES_FOR} = $ce->{pg}->{specialPGEnvironmentVars}->{PRINT_FILE_NAMES_FOR}; | ||
| 377 : | |||
| 378 : | # variables for interpreting capa problems. | ||
| 379 : | $envir{CAPA_Tools} = $ce->{pg}->{specialPGEnvironmentVars}->{CAPA_Tools}; | ||
| 380 : | $envir{CAPA_MCTools} = $ce->{pg}->{specialPGEnvironmentVars}->{CAPA_MCTools}; | ||
| 381 : | $envir{CAPA_Graphics_URL} = $ce->{pg}->{specialPGEnvironmentVars}->{CAPA_Graphics_URL}; | ||
| 382 : | $envir{CAPA_GraphicsDirectory} = $ce->{pg}->{specialPGEnvironmentVars}->{CAPA_GraphicsDirectory}; | ||
| 383 : | |||
| 384 : | return \%envir; | ||
| 385 : | } | ||
| 386 : | |||
| 387 : | sub translateDisplayModeNames($) { | ||
| 388 : | my $name = shift; | ||
| 389 : | return { | ||
| 390 : | tex => "TeX", | ||
| 391 : | plainText => "HTML", | ||
| 392 : | formattedText => "HTML_tth", | ||
| 393 : | images => "HTML_dpng", # "HTML_img", | ||
| 394 : | }->{$name}; | ||
| 395 : | } | ||
| 396 : | |||
| 397 : | sub safetyFilter { | ||
| 398 : | my $answer = shift; # accepts one answer and checks it | ||
| 399 : | my $submittedAnswer = $answer; | ||
| 400 : | $answer = '' unless defined $answer; | ||
| 401 : | my ($errorno); | ||
| 402 : | $answer =~ tr/\000-\037/ /; | ||
| 403 : | # Return if answer field is empty | ||
| 404 : | unless ($answer =~ /\S/) { | ||
| 405 : | #$errorno = "<BR>No answer was submitted."; | ||
| 406 : | $errorno = 0; ## don't report blank answer as error | ||
| 407 : | return ($answer,$errorno); | ||
| 408 : | } | ||
| 409 : | # replace ^ with ** (for exponentiation) | ||
| 410 : | # $answer =~ s/\^/**/g; | ||
| 411 : | # Return if forbidden characters are found | ||
| 412 : | unless ($answer =~ /^[a-zA-Z0-9_\-\+ \t\/@%\*\.\n^\[\]\(\)\,\|]+$/ ) { | ||
| 413 : | $answer =~ tr/a-zA-Z0-9_\-\+ \t\/@%\*\.\n^\(\)/#/c; | ||
| 414 : | $errorno = "<BR>There are forbidden characters in your answer: $submittedAnswer<BR>"; | ||
| 415 : | return ($answer,$errorno); | ||
| 416 : | } | ||
| 417 : | $errorno = 0; | ||
| 418 : | return($answer, $errorno); | ||
| 419 : | } | ||
| 420 : | |||
| 421 : | 1; | ||
| 422 : | |||
| 423 : | __END__ | ||
| 424 : | |||
| 425 : | =head1 OPERATION | ||
| 426 : | |||
| 427 : | WeBWorK::PG goes through the following operations when constructed: | ||
| 428 : | |||
| 429 : | =over | ||
| 430 : | |||
| 431 : | =item Get database information | ||
| 432 : | |||
| 433 : | Retrieve information about the current user, set, and problem from the | ||
| 434 : | database. | ||
| 435 : | |||
| 436 : | =item Create a translator | ||
| 437 : | |||
| 438 : | Instantiate a WeBWorK::PG::Translator object. | ||
| 439 : | |||
| 440 : | =item Set the directory hash | ||
| 441 : | |||
| 442 : | Set the translator's directory hash (courseScripts, macros, templates, and temp | ||
| 443 : | directories) from the course environment. | ||
| 444 : | |||
| 445 : | =item Evaluate PG modules | ||
| 446 : | |||
| 447 : | Using the module list from the course environment (pg->modules), perform a | ||
| 448 : | "use"-like operation to evaluate modules at runtime. | ||
| 449 : | |||
| 450 : | =item Set the problem environment | ||
| 451 : | |||
| 452 : | Use data from the user, set, and problem, as well as the course environemnt and | ||
| 453 : | translation options, to set the problem environment. | ||
| 454 : | |||
| 455 : | =item Initialize the translator | ||
| 456 : | |||
| 457 : | Call &WeBWorK::PG::Translator::initialize. What more do you want? | ||
| 458 : | |||
| 459 : | =item Load PG.pl and dangerousMacros.pl | ||
| 460 : | |||
| 461 : | These macros must be loaded without opcode masking, so they are loaded here. | ||
| 462 : | |||
| 463 : | =item Set the opcode mask | ||
| 464 : | |||
| 465 : | Set the opcode mask to the default specified by WeBWorK::PG::Translator. | ||
| 466 : | |||
| 467 : | =item Load the problem source | ||
| 468 : | |||
| 469 : | Give the problem source to the translator. | ||
| 470 : | |||
| 471 : | =item Install a safety filter | ||
| 472 : | |||
| 473 : | The safety filter is used to preprocess student input before evaluation. The | ||
| 474 : | default safety filter, &WeBWorK::PG::safetyFilter, is used. | ||
| 475 : | |||
| 476 : | =item Translate the problem source | ||
| 477 : | |||
| 478 : | Call &WeBWorK::PG::Translator::translate to render the problem source into the | ||
| 479 : | format given by the display mode. | ||
| 480 : | |||
| 481 : | =item Process student answers | ||
| 482 : | |||
| 483 : | Use form field inputs to evaluate student answers. | ||
| 484 : | |||
| 485 : | =item Load the problem state | ||
| 486 : | |||
| 487 : | Use values from the database to initialize the problem state, so that the | ||
| 488 : | grader will have a point of reference. | ||
| 489 : | |||
| 490 : | =item Determine an entry order | ||
| 491 : | |||
| 492 : | Use the ANSWER_ENTRY_ORDER flag to determine the order of answers in the | ||
| 493 : | problem. This is important for problems with dependancies among parts. | ||
| 494 : | |||
| 495 : | =item Install a grader | ||
| 496 : | |||
| 497 : | Use the PROBLEM_GRADER_TO_USE flag, or a default from the course environment, | ||
| 498 : | to install a grader. | ||
| 499 : | |||
| 500 : | =item Grade the problem | ||
| 501 : | |||
| 502 : | Use the selected grader to grade the problem. | ||
| 503 : | |||
| 504 : | =back | ||
| 505 : | |||
| 506 : | =head1 AUTHOR | ||
| 507 : | |||
| 508 : | Written by Sam Hathaway, sh002i (at) math.rochester.edu. | ||
| 509 : | |||
| 510 : | =cut |
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