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| 1 : | sh002i | 440 | ################################################################################ |
| 2 : | # WeBWorK mod_perl (c) 1995-2002 WeBWorK Team, Univeristy of Rochester | ||
| 3 : | # $Id$ | ||
| 4 : | ################################################################################ | ||
| 5 : | |||
| 6 : | sh002i | 424 | package WeBWorK::PG; |
| 7 : | sh002i | 414 | |
| 8 : | sh002i | 455 | =head1 NAME |
| 9 : | |||
| 10 : | WeBWorK::PG - Wrap the action of the PG Translator in an easy-to-use API | ||
| 11 : | |||
| 12 : | =cut | ||
| 13 : | |||
| 14 : | sh002i | 414 | use strict; |
| 15 : | use warnings; | ||
| 16 : | use WeBWorK::DB::Classlist; | ||
| 17 : | use WeBWorK::DB::WW; | ||
| 18 : | use WeBWorK::PG::Translator; | ||
| 19 : | sh002i | 455 | use WeBWorK::Utils qw(readFile formatDateTime); |
| 20 : | sh002i | 414 | |
| 21 : | sh002i | 424 | sub new($$$$$$$$) { |
| 22 : | sh002i | 415 | my $invocant = shift; |
| 23 : | my $class = ref($invocant) || $invocant; | ||
| 24 : | sh002i | 424 | my ( |
| 25 : | $courseEnv, | ||
| 26 : | $userName, | ||
| 27 : | $key, | ||
| 28 : | $setName, | ||
| 29 : | $problemNumber, | ||
| 30 : | $translationOptions, # hashref containing options for the | ||
| 31 : | # translator, such as whether to show | ||
| 32 : | # hints and the display mode to use | ||
| 33 : | $formFields, # in CGI::Vars format | ||
| 34 : | ) = @_; | ||
| 35 : | sh002i | 415 | |
| 36 : | sh002i | 414 | # get database information |
| 37 : | my $classlist = WeBWorK::DB::Classlist->new($courseEnv); | ||
| 38 : | my $wwdb = WeBWorK::DB::WW->new($courseEnv); | ||
| 39 : | my $user = $classlist->getUser($userName); | ||
| 40 : | my $set = $wwdb->getSet($userName, $setName); | ||
| 41 : | my $problem = $wwdb->getProblem($userName, $setName, $problemNumber); | ||
| 42 : | my $psvn = $wwdb->getPSVN($userName, $setName); | ||
| 43 : | |||
| 44 : | # create a Translator | ||
| 45 : | sh002i | 424 | warn "PG: creating a Translator\n"; |
| 46 : | sh002i | 414 | my $translator = WeBWorK::PG::Translator->new; |
| 47 : | |||
| 48 : | sh002i | 424 | # set the directory hash |
| 49 : | warn "PG: setting the directory hash\n"; | ||
| 50 : | sh002i | 414 | $translator->rh_directories({ |
| 51 : | courseScriptsDirectory => $courseEnv->{webworkDirs}->{macros}, | ||
| 52 : | macroDirectory => $courseEnv->{courseDirs}->{macros}, | ||
| 53 : | templateDirectory => $courseEnv->{courseDirs}->{templates}, | ||
| 54 : | tempDirectory => $courseEnv->{courseDirs}->{html_temp}, | ||
| 55 : | }); | ||
| 56 : | |||
| 57 : | sh002i | 424 | # evaluate modules and "extra packages" |
| 58 : | warn "PG: evaluating modules and \"extra packages\"\n"; | ||
| 59 : | my @modules = @{ $courseEnv->{pg}->{modules} }; | ||
| 60 : | foreach my $module_packages (@modules) { | ||
| 61 : | # the first item in $module_packages is the main package | ||
| 62 : | $translator->evaluate_modules(shift @$module_packages); | ||
| 63 : | # the remaining items are "extra" packages | ||
| 64 : | $translator->load_extra_packages(@$module_packages); | ||
| 65 : | sh002i | 414 | } |
| 66 : | |||
| 67 : | sh002i | 424 | # set the environment (from defineProblemEnvir) |
| 68 : | warn "PG: setting the environment (from defineProblemEnvir)\n"; | ||
| 69 : | $translator->environment(defineProblemEnvir( | ||
| 70 : | $courseEnv, $user, $key, $set, $problem, $psvn, $formFields, $translationOptions)); | ||
| 71 : | sh002i | 414 | |
| 72 : | sh002i | 424 | # initialize the Translator |
| 73 : | warn "PG: initializing the Translator\n"; | ||
| 74 : | sh002i | 414 | $translator->initialize(); |
| 75 : | |||
| 76 : | sh002i | 424 | # load PG.pl and dangerousMacros.pl using unrestricted_load |
| 77 : | sh002i | 425 | # i'd like to change this at some point to have the same sort of interface to global.conf |
| 78 : | # that the module loading does -- have a list of macros to load unrestrictedly. | ||
| 79 : | sh002i | 424 | warn "PG: loading PG.pl and dangerousMacros.pl using unrestricted_load\n"; |
| 80 : | sh002i | 414 | my $pg_pl = $courseEnv->{webworkDirs}->{macros} . "/PG.pl"; |
| 81 : | sh002i | 424 | my $dangerousMacros_pl = $courseEnv->{webworkDirs}->{macros} . "/dangerousMacros.pl"; |
| 82 : | sh002i | 414 | my $err = $translator->unrestricted_load($pg_pl); |
| 83 : | warn "Error while loading $pg_pl: $err" if $err; | ||
| 84 : | $err = $translator->unrestricted_load($dangerousMacros_pl); | ||
| 85 : | warn "Error while loading $dangerousMacros_pl: $err" if $err; | ||
| 86 : | |||
| 87 : | sh002i | 424 | # set the opcode mask (using default values) |
| 88 : | warn "PG: setting the opcode mask (using default values)\n"; | ||
| 89 : | sh002i | 414 | $translator->set_mask(); |
| 90 : | |||
| 91 : | sh002i | 424 | # store the problem source |
| 92 : | warn "PG: storing the problem source\n"; | ||
| 93 : | sh002i | 414 | my $sourceFile = $courseEnv->{courseDirs}->{templates}."/".$problem->source_file; |
| 94 : | $translator->source_string(readFile($sourceFile)); | ||
| 95 : | |||
| 96 : | # install a safety filter (&safetyFilter) | ||
| 97 : | sh002i | 424 | warn "PG: installing a safety filter\n"; |
| 98 : | sh002i | 414 | $translator->rf_safety_filter(\&safetyFilter); |
| 99 : | |||
| 100 : | sh002i | 415 | # translate the PG source into text |
| 101 : | sh002i | 424 | warn "PG: translating the PG source into text\n"; |
| 102 : | sh002i | 415 | $translator->translate(); |
| 103 : | |||
| 104 : | sh002i | 424 | # [in Problem.pm and processProblem8.pl, "install a grader" is here] |
| 105 : | sh002i | 415 | |
| 106 : | sh002i | 424 | # process student answers |
| 107 : | warn "PG: processing student answers\n"; | ||
| 108 : | $translator->process_answers($formFields); | ||
| 109 : | sh002i | 415 | |
| 110 : | sh002i | 424 | # retrieve the problem state and give it to the translator |
| 111 : | warn "PG: retrieving the problem state and giving it to the translator\n"; | ||
| 112 : | $translator->rh_problem_state({ | ||
| 113 : | recorded_score => $problem->status, | ||
| 114 : | num_of_correct_ans => $problem->num_correct, | ||
| 115 : | num_of_incorrect_ans => $problem->num_incorrect, | ||
| 116 : | }); | ||
| 117 : | |||
| 118 : | # determine an entry order -- the ANSWER_ENTRY_ORDER flag is built by | ||
| 119 : | # the PG macro package (PG.pl) | ||
| 120 : | warn "PG: determining an entry order\n"; | ||
| 121 : | my @answerOrder = | ||
| 122 : | $translator->rh_flags->{ANSWER_ENTRY_ORDER} | ||
| 123 : | ? @{ $translator->rh_flags->{ANSWER_ENTRY_ORDER} } | ||
| 124 : | : keys %{ $translator->rh_evaluated_answers }; | ||
| 125 : | |||
| 126 : | # install a grader -- use the one specified in the problem, | ||
| 127 : | # or fall back on the default from the course environment. | ||
| 128 : | # (two magic strings are accepted, to avoid having to | ||
| 129 : | # reference code when it would be difficult.) | ||
| 130 : | warn "PG: installing a grader\n"; | ||
| 131 : | my $grader = $translator->rh_flags->{PROBLEM_GRADER_TO_USE} | ||
| 132 : | || $courseEnv->{pg}->{options}->{grader}; | ||
| 133 : | $grader = $translator->rf_std_problem_grader | ||
| 134 : | if $grader eq "std_problem_grader"; | ||
| 135 : | $grader = $translator->rf_avg_problem_grader | ||
| 136 : | if $grader eq "avg_problem_grader"; | ||
| 137 : | die "Problem grader $grader is not a CODE reference." | ||
| 138 : | unless ref $grader eq "CODE"; | ||
| 139 : | $translator->rf_problem_grader($grader); | ||
| 140 : | |||
| 141 : | sh002i | 440 | # grade the problem |
| 142 : | warn "PG: grading the problem\n"; | ||
| 143 : | sh002i | 424 | my ($result, $state) = $translator->grade_problem( |
| 144 : | answers_submitted => $translationOptions->{processAnswers}, | ||
| 145 : | ANSWER_ENTRY_ORDER => \@answerOrder, | ||
| 146 : | ); | ||
| 147 : | |||
| 148 : | # return an object which contains the translator and the results of | ||
| 149 : | # the translation process. this is DIFFERENT from the "format expected | ||
| 150 : | # by Webwork.pm (and I believe processProblem8, but check.)" | ||
| 151 : | return bless { | ||
| 152 : | translator => $translator, | ||
| 153 : | head_text => ${ $translator->r_header }, | ||
| 154 : | body_text => ${ $translator->r_text }, | ||
| 155 : | answers => $translator->rh_evaluated_answers, | ||
| 156 : | result => $result, | ||
| 157 : | state => $state, | ||
| 158 : | errors => $translator->errors, # *** what is this doing? | ||
| 159 : | warnings => undef, # *** gotta catch warnings eventually... | ||
| 160 : | flags => $translator->rh_flags, | ||
| 161 : | }, $class; | ||
| 162 : | sh002i | 414 | } |
| 163 : | |||
| 164 : | # ----- | ||
| 165 : | |||
| 166 : | sh002i | 424 | sub defineProblemEnvir($$$$$$$) { |
| 167 : | my ( | ||
| 168 : | $courseEnv, | ||
| 169 : | $user, | ||
| 170 : | $key, | ||
| 171 : | $set, | ||
| 172 : | $problem, | ||
| 173 : | $psvn, | ||
| 174 : | $formFields, | ||
| 175 : | $options, | ||
| 176 : | ) = @_; | ||
| 177 : | sh002i | 414 | |
| 178 : | my %envir; | ||
| 179 : | |||
| 180 : | # PG environment variables | ||
| 181 : | # from docs/pglanguage/pgreference/environmentvariables as of 06/25/2002 | ||
| 182 : | # any changes are noted by "ADDED:" or "REMOVED:" | ||
| 183 : | |||
| 184 : | # Vital state information | ||
| 185 : | sh002i | 434 | # ADDED: displayHintsQ, displaySolutionsQ |
| 186 : | sh002i | 414 | |
| 187 : | $envir{psvn} = $psvn; | ||
| 188 : | $envir{psvnNumber} = $envir{psvn}; | ||
| 189 : | $envir{probNum} = $problem->id; | ||
| 190 : | $envir{questionNumber} = $envir{probNum}; | ||
| 191 : | $envir{fileName} = $problem->source_file; | ||
| 192 : | $envir{probFileName} = $envir{fileName}; | ||
| 193 : | $envir{problemSeed} = $problem->problem_seed; | ||
| 194 : | sh002i | 424 | $envir{displayMode} = translateDisplayModeNames($options->{displayMode}); |
| 195 : | sh002i | 414 | $envir{languageMode} = $envir{displayMode}; |
| 196 : | $envir{outputMode} = $envir{displayMode}; | ||
| 197 : | sh002i | 424 | $envir{displayHintsQ} = $options->{hints}; |
| 198 : | $envir{displaySolutionsQ} = $options->{solutions}; | ||
| 199 : | sh002i | 434 | $envir{refreshMath2img} = $options->{refreshMath2img}; |
| 200 : | sh002i | 414 | |
| 201 : | # Problem Information | ||
| 202 : | # ADDED: courseName | ||
| 203 : | |||
| 204 : | $envir{openDate} = $set->open_date; | ||
| 205 : | sh002i | 424 | $envir{formattedOpenDate} = formatDateTime($envir{openDate}); |
| 206 : | sh002i | 414 | $envir{dueDate} = $set->due_date; |
| 207 : | sh002i | 424 | $envir{formattedDueDate} = formatDateTime($envir{dueDate}); |
| 208 : | sh002i | 414 | $envir{answerDate} = $set->answer_date; |
| 209 : | sh002i | 424 | $envir{formattedAnswerDate} = formatDateTime($envir{answerDate}); |
| 210 : | sh002i | 414 | $envir{numOfAttempts} = $problem->num_correct + $problem->num_incorrect; |
| 211 : | $envir{problemValue} = $problem->value; | ||
| 212 : | sh002i | 424 | $envir{sessionKey} = $key; |
| 213 : | sh002i | 414 | $envir{courseName} = $courseEnv->{courseName}; |
| 214 : | |||
| 215 : | # Student Information | ||
| 216 : | # ADDED: studentID | ||
| 217 : | |||
| 218 : | $envir{sectionName} = $user->section; | ||
| 219 : | $envir{sectionNumber} = $envir{sectionName}; | ||
| 220 : | $envir{recitationName} = $user->recitation; | ||
| 221 : | $envir{recitationNumber} = $envir{recitationName}; | ||
| 222 : | $envir{setNumber} = $set->id; | ||
| 223 : | $envir{studentLogin} = $user->id; | ||
| 224 : | $envir{studentName} = $user->first_name . " " . $user->last_name; | ||
| 225 : | sh002i | 424 | $envir{studentID} = $user->student_id; |
| 226 : | sh002i | 414 | |
| 227 : | # Answer Information | ||
| 228 : | sh002i | 434 | # REMOVED: refSubmittedAnswers |
| 229 : | sh002i | 414 | |
| 230 : | sh002i | 434 | $envir{inputs_ref} = $formFields; |
| 231 : | sh002i | 414 | |
| 232 : | sh002i | 433 | # External Programs |
| 233 : | sh002i | 434 | |
| 234 : | sh002i | 433 | $envir{externalTTHPath} = $courseEnv->{externalPrograms}->{tth}; |
| 235 : | $envir{externalMath2imgPath} = $courseEnv->{externalPrograms}->{math2img}; | ||
| 236 : | sh002i | 414 | |
| 237 : | # Directories and URLs | ||
| 238 : | # REMOVED: courseName | ||
| 239 : | |||
| 240 : | $envir{cgiDirectory} = undef; | ||
| 241 : | $envir{cgiURL} = undef; | ||
| 242 : | $envir{classDirectory} = undef; | ||
| 243 : | sh002i | 424 | $envir{courseScriptsDirectory} = $courseEnv->{webworkDirs}->{macros}."/"; |
| 244 : | $envir{htmlDirectory} = $courseEnv->{courseDirs}->{html}."/"; | ||
| 245 : | sh002i | 414 | $envir{htmlURL} = $courseEnv->{courseURLs}->{html}; |
| 246 : | sh002i | 424 | $envir{macroDirectory} = $courseEnv->{courseDirs}->{macros}."/"; |
| 247 : | $envir{templateDirectory} = $courseEnv->{courseDirs}->{templates}."/"; | ||
| 248 : | $envir{tempDirectory} = $courseEnv->{courseDirs}->{html_temp}."/"; | ||
| 249 : | sh002i | 414 | $envir{tempURL} = $courseEnv->{courseURLs}->{html_temp}; |
| 250 : | $envir{scriptDirectory} = undef; | ||
| 251 : | $envir{webworkDocsURL} = $courseEnv->{webworkURLs}->{docs}; | ||
| 252 : | |||
| 253 : | sh002i | 433 | # Default values for evaluating answers |
| 254 : | sh002i | 425 | |
| 255 : | sh002i | 433 | my $ansEvalDefaults = $courseEnv->{pg}->{ansEvalDefaults}; |
| 256 : | $envir{$_} = $ansEvalDefaults->{$_} foreach (keys %$ansEvalDefaults); | ||
| 257 : | |||
| 258 : | # Other things... | ||
| 259 : | |||
| 260 : | sh002i | 425 | $envir{PROBLEM_GRADER_TO_USE} = $courseEnv->{pg}->{options}->{grader}; |
| 261 : | |||
| 262 : | sh002i | 414 | return \%envir; |
| 263 : | } | ||
| 264 : | |||
| 265 : | sh002i | 424 | sub translateDisplayModeNames($) { |
| 266 : | my $name = shift; | ||
| 267 : | return { | ||
| 268 : | plainText => "HTML", | ||
| 269 : | formattedText => "HTML_tth", | ||
| 270 : | sh002i | 433 | images => "HTML_img" |
| 271 : | sh002i | 424 | }->{$name}; |
| 272 : | } | ||
| 273 : | |||
| 274 : | sh002i | 414 | sub safetyFilter { |
| 275 : | sh002i | 415 | my $answer = shift; # accepts one answer and checks it |
| 276 : | sh002i | 414 | my $submittedAnswer = $answer; |
| 277 : | $answer = '' unless defined $answer; | ||
| 278 : | my ($errorno); | ||
| 279 : | $answer =~ tr/\000-\037/ /; | ||
| 280 : | # Return if answer field is empty | ||
| 281 : | unless ($answer =~ /\S/) { | ||
| 282 : | #$errorno = "<BR>No answer was submitted."; | ||
| 283 : | $errorno = 0; ## don't report blank answer as error | ||
| 284 : | return ($answer,$errorno); | ||
| 285 : | } | ||
| 286 : | # replace ^ with ** (for exponentiation) | ||
| 287 : | # $answer =~ s/\^/**/g; | ||
| 288 : | # Return if forbidden characters are found | ||
| 289 : | unless ($answer =~ /^[a-zA-Z0-9_\-\+ \t\/@%\*\.\n^\(\)]+$/ ) { | ||
| 290 : | $answer =~ tr/a-zA-Z0-9_\-\+ \t\/@%\*\.\n^\(\)/#/c; | ||
| 291 : | $errorno = "<BR>There are forbidden characters in your answer: $submittedAnswer<BR>"; | ||
| 292 : | return ($answer,$errorno); | ||
| 293 : | } | ||
| 294 : | $errorno = 0; | ||
| 295 : | return($answer, $errorno); | ||
| 296 : | } | ||
| 297 : | |||
| 298 : | 1; | ||
| 299 : | sh002i | 440 | |
| 300 : | __END__ | ||
| 301 : | |||
| 302 : | =head1 SYNOPSIS | ||
| 303 : | |||
| 304 : | $pg = WeBWorK::PG->new( | ||
| 305 : | $courseEnv, # a WeBWorK::CourseEnvironment object | ||
| 306 : | $userName, | ||
| 307 : | $sessionKey, | ||
| 308 : | $setName, | ||
| 309 : | $problemNumber, | ||
| 310 : | { # translation options | ||
| 311 : | displayMode => "images", # (plainText|formattedText|images) | ||
| 312 : | showHints => 1, # (0|1) | ||
| 313 : | showSolutions => 0, # (0|1) | ||
| 314 : | refreshMath2img => 0, # (0|1) | ||
| 315 : | processAnswers => 1, # (0|1) | ||
| 316 : | }, | ||
| 317 : | $formFields # in WeBWorK::Form::Vars format | ||
| 318 : | ); | ||
| 319 : | |||
| 320 : | $translator = $pg->{translator}; # WeBWorK::PG::Translator | ||
| 321 : | $body = $pg->{body_text}; # text string | ||
| 322 : | $header = $pg->{head_text}; # text string | ||
| 323 : | $answerHash = $pg->{answers}; # WeBWorK::PG::AnswerHash | ||
| 324 : | $result = $pg->{result}; # hash reference | ||
| 325 : | $state = $pg->{state}; # hash reference | ||
| 326 : | $errors = $pg->{errors}; # text string | ||
| 327 : | $warnings = $pg->{warnings}; # text string | ||
| 328 : | $flags = $pg->{flags}; # hash reference | ||
| 329 : | |||
| 330 : | =head1 DESCRIPTION | ||
| 331 : | |||
| 332 : | WeBWorK::PG encapsulates the PG translation process, making multiple calls to | ||
| 333 : | WeBWorK::PG::Translator. Much of the flexibility of the Translator is hidden, | ||
| 334 : | instead making choices that are appropriate for the webwork-modperl system. | ||
| 335 : | |||
| 336 : | =head1 CONSTRUCTION | ||
| 337 : | |||
| 338 : | =over | ||
| 339 : | |||
| 340 : | =item new (ENVIRONMENT, USER, KEY, SET, PROBLEM, OPTIONS, FIELDS) | ||
| 341 : | |||
| 342 : | The C<new> method creates a translator, initializes it using the parameters | ||
| 343 : | specified, translates a PG file, and processes answers. It returns a reference | ||
| 344 : | to a blessed hash containing the results of the translation process. | ||
| 345 : | |||
| 346 : | =back | ||
| 347 : | |||
| 348 : | =head2 Parameters | ||
| 349 : | |||
| 350 : | =over | ||
| 351 : | |||
| 352 : | =item ENVIRONMENT | ||
| 353 : | |||
| 354 : | a WeBWorK::CourseEnvironment object | ||
| 355 : | |||
| 356 : | =item USER | ||
| 357 : | |||
| 358 : | the name of the user for whom to render | ||
| 359 : | |||
| 360 : | =item KEY | ||
| 361 : | |||
| 362 : | the session key of the current session | ||
| 363 : | |||
| 364 : | =item SET | ||
| 365 : | |||
| 366 : | the name of the problem set from which to get the problem | ||
| 367 : | |||
| 368 : | =item PROBLEM | ||
| 369 : | |||
| 370 : | the number of the problem to render | ||
| 371 : | |||
| 372 : | =item OPTIONS | ||
| 373 : | |||
| 374 : | a reference to a hash containing the following data: | ||
| 375 : | |||
| 376 : | =over | ||
| 377 : | |||
| 378 : | =item displayMode | ||
| 379 : | |||
| 380 : | one of "plainText", "formattedText", or "images" | ||
| 381 : | |||
| 382 : | =item showHints | ||
| 383 : | |||
| 384 : | boolean, render hints | ||
| 385 : | |||
| 386 : | =item showSolutions | ||
| 387 : | |||
| 388 : | boolean, render solutions | ||
| 389 : | |||
| 390 : | =item refreshMath2img | ||
| 391 : | |||
| 392 : | boolean, force images created by math2img (in "images" mode) to be recreated, | ||
| 393 : | even if the PG source has not been updated. | ||
| 394 : | |||
| 395 : | =item processAnswers | ||
| 396 : | |||
| 397 : | boolean, call answer evaluators and graders | ||
| 398 : | |||
| 399 : | =back | ||
| 400 : | |||
| 401 : | =item FIELDS | ||
| 402 : | |||
| 403 : | a reference to a hash (as returned by &WeBWorK::Form::Vars) containing form | ||
| 404 : | fields submitted by a problem processor. The translator will look for fields | ||
| 405 : | like "AnSwEr[0-9]" containing submitted student answers. | ||
| 406 : | |||
| 407 : | =back | ||
| 408 : | |||
| 409 : | =head2 RETURN VALUE | ||
| 410 : | |||
| 411 : | The C<new> method returns a blessed hash reference containing the following | ||
| 412 : | fields. More information can be found in the documentation for | ||
| 413 : | WeBWorK::PG::Translator. | ||
| 414 : | |||
| 415 : | =over | ||
| 416 : | |||
| 417 : | =item translator | ||
| 418 : | |||
| 419 : | The WeBWorK::PG::Translator object used to render the problem. | ||
| 420 : | |||
| 421 : | =item head_text | ||
| 422 : | |||
| 423 : | HTML code for the E<lt>headE<gt> block of an resulting web page. Used for | ||
| 424 : | JavaScript features. | ||
| 425 : | |||
| 426 : | =item body_text | ||
| 427 : | |||
| 428 : | HTML code for the E<lt>bodyE<gt> block of an resulting web page. | ||
| 429 : | |||
| 430 : | =item answers | ||
| 431 : | |||
| 432 : | An C<AnswerHash> object containing submitted answers, and results of answer | ||
| 433 : | evaluation. | ||
| 434 : | |||
| 435 : | =item result | ||
| 436 : | |||
| 437 : | A hash containing the results of grading the problem. | ||
| 438 : | |||
| 439 : | =item state | ||
| 440 : | |||
| 441 : | A hash containing the new problem state. | ||
| 442 : | |||
| 443 : | =item errors | ||
| 444 : | |||
| 445 : | A string containing any errors encountered while rendering the problem. | ||
| 446 : | |||
| 447 : | =item warnings | ||
| 448 : | |||
| 449 : | A string containing any warnings encountered while rendering the problem. | ||
| 450 : | |||
| 451 : | =item flags | ||
| 452 : | |||
| 453 : | A hash containing PG_flags (see the Translator docs). | ||
| 454 : | |||
| 455 : | =back | ||
| 456 : | |||
| 457 : | =head1 OPERATION | ||
| 458 : | |||
| 459 : | WeBWorK::PG goes through the following operations when constructed: | ||
| 460 : | |||
| 461 : | =over | ||
| 462 : | |||
| 463 : | =item Get database information | ||
| 464 : | |||
| 465 : | Retrieve information about the current user, set, and problem from the | ||
| 466 : | database. | ||
| 467 : | |||
| 468 : | =item Create a translator | ||
| 469 : | |||
| 470 : | Instantiate a WeBWorK::PG::Translator object. | ||
| 471 : | |||
| 472 : | =item Set the directory hash | ||
| 473 : | |||
| 474 : | Set the translator's directory hash (courseScripts, macros, templates, and temp | ||
| 475 : | directories) from the course environment. | ||
| 476 : | |||
| 477 : | =item Evaluate PG modules | ||
| 478 : | |||
| 479 : | Using the module list from the course environment (pg->modules), perform a | ||
| 480 : | "use"-like operation to evaluate modules at runtime. | ||
| 481 : | |||
| 482 : | =item Set the problem environment | ||
| 483 : | |||
| 484 : | Use data from the user, set, and problem, as well as the course environemnt and | ||
| 485 : | translation options, to set the problem environment. | ||
| 486 : | |||
| 487 : | =item Initialize the translator | ||
| 488 : | |||
| 489 : | Call &WeBWorK::PG::Translator::initialize. What more do you want? | ||
| 490 : | |||
| 491 : | =item Load PG.pl and dangerousMacros.pl | ||
| 492 : | |||
| 493 : | These macros must be loaded without opcode masking, so they are loaded here. | ||
| 494 : | |||
| 495 : | =item Set the opcode mask | ||
| 496 : | |||
| 497 : | Set the opcode mask to the default specified by WeBWorK::PG::Translator. | ||
| 498 : | |||
| 499 : | =item Load the problem source | ||
| 500 : | |||
| 501 : | Give the problem source to the translator. | ||
| 502 : | |||
| 503 : | =item Install a safety filter | ||
| 504 : | |||
| 505 : | The safety filter is used to preprocess student input before evaluation. The | ||
| 506 : | default safety filter, &WeBWorK::PG::safetyFilter, is used. | ||
| 507 : | |||
| 508 : | =item Translate the problem source | ||
| 509 : | |||
| 510 : | Call &WeBWorK::PG::Translator::translate to render the problem source into the | ||
| 511 : | format given by the display mode. | ||
| 512 : | |||
| 513 : | =item Process student answers | ||
| 514 : | |||
| 515 : | Use form field inputs to evaluate student answers. | ||
| 516 : | |||
| 517 : | =item Load the problem state | ||
| 518 : | |||
| 519 : | Use values from the database to initialize the problem state, so that the | ||
| 520 : | grader will have a point of reference. | ||
| 521 : | |||
| 522 : | =item Determine an entry order | ||
| 523 : | |||
| 524 : | Use the ANSWER_ENTRY_ORDER flag to determine the order of answers in the | ||
| 525 : | problem. This is important for problems with dependancies among parts. | ||
| 526 : | |||
| 527 : | =item Install a grader | ||
| 528 : | |||
| 529 : | Use the PROBLEM_GRADER_TO_USE flag, or a default from the course environment, | ||
| 530 : | to install a grader. | ||
| 531 : | |||
| 532 : | =item Grade the problem | ||
| 533 : | |||
| 534 : | Use the selected grader to grade the problem. | ||
| 535 : | |||
| 536 : | =back | ||
| 537 : | |||
| 538 : | =head1 AUTHOR | ||
| 539 : | |||
| 540 : | Written by Sam Hathaway, sh002i (at) math.rochester.edu. | ||
| 541 : | |||
| 542 : | =cut |
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